diff --git a/1_programmability/2_non_incremental/index.html b/1_programmability/2_non_incremental/index.html
index ff38ee2..defb647 100644
--- a/1_programmability/2_non_incremental/index.html
+++ b/1_programmability/2_non_incremental/index.html
@@ -181,7 +181,7 @@ <h1 id="non-incremental-context"><a class="header" href="#non-incremental-contex
 <h2 id="context-module"><a class="header" href="#context-module">Context module</a></h2>
 <p>Since we will be implementing three different contexts in this tutorial, we will separate them in different modules.
 Create the <code>context</code> module by adding a module to <code>pie/src/lib.rs</code>:</p>
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+<div class="diff2html" id="diff2html_0"></div>
 <script>
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     let diff = String.raw`--- pie/src/lib.rs
@@ -300,7 +300,7 @@ <h2 id="simple-test"><a class="header" href="#simple-test">Simple Test</a></h2>
 <p>Run the test by running <code>cargo test</code>.
 The output should look something like:</p>
 <pre><code class="language-shell ">   Compiling pie v0.1.0 (/pie)
-    Finished test [unoptimized + debuginfo] target(s) in 0.44s
+    Finished test [unoptimized + debuginfo] target(s) in 0.47s
      Running unittests src/lib.rs (/pie/target/debug/deps/pie-6c9d55a7ef727e00)
 
 running 1 test
@@ -341,7 +341,7 @@ <h2 id="simple-test"><a class="header" href="#simple-test">Simple Test</a></h2>
 <h2 id="test-with-multiple-tasks"><a class="header" href="#test-with-multiple-tasks">Test with Multiple Tasks</a></h2>
 <p>Our first test only tests a single task that does not use the context, so let's write a test with two tasks where one requires the other to increase our test coverage.
 Add the following test:</p>
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+<div class="diff2html" id="diff2html_1"></div>
 <script>
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     let diff = String.raw`--- pie/src/context/non_incremental.rs
@@ -415,7 +415,7 @@ <h2 id="test-with-multiple-tasks"><a class="header" href="#test-with-multiple-ta
 <p>The problem is that <code>execute</code> of <code>ToLowerCase</code> takes a <code>Context&lt;Self&gt;</code>, so in <code>impl Task for ToLowerCase</code> it takes a <code>Context&lt;ToLowerCase&gt;</code>, while we're trying to require <code>&amp;ReturnHelloWorld</code> through the context.
 This doesn't work as <code>Context&lt;ToLowerCase&gt;::require_task</code> only takes a <code>&amp;ToLowerCase</code> as input.</p>
 <p>We could change <code>execute</code> of <code>ToLowerCase</code> to take <code>Context&lt;ReturnHelloWorld&gt;</code>:</p>
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     let diff = String.raw`--- pie/src/context/non_incremental.rs
@@ -487,7 +487,7 @@ <h2 id="test-with-multiple-tasks"><a class="header" href="#test-with-multiple-ta
 </details>
 <p>For now, we will solve this by just using a single task type which is an enumeration of the different possible tasks.
 Replace the test with the following:</p>
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 <script>
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     let diff = String.raw`--- original
diff --git a/2_incrementality/1_require_file/index.html b/2_incrementality/1_require_file/index.html
index 98373c6..86fd747 100644
--- a/2_incrementality/1_require_file/index.html
+++ b/2_incrementality/1_require_file/index.html
@@ -179,7 +179,7 @@ <h1 id="requiring-files"><a class="header" href="#requiring-files">Requiring Fil
 <p>Since build systems frequently interact with files, and changes to files can affect tasks, we need to keep track of file dependencies.
 Therefore, we will extend the <code>Context</code> API with methods to <em>require files</em>, enabling tasks to specify dynamic dependencies to files.</p>
 <p>Add a method to the <code>Context</code> trait in <code>pie/src/lib.rs</code>:</p>
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 <script>
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     let diff = String.raw`--- pie/src/lib.rs
@@ -257,7 +257,7 @@ <h1 id="requiring-files"><a class="header" href="#requiring-files">Requiring Fil
 <p>Now we need to implement this method for <code>NonIncrementalContext</code>.
 However, because we will be performing similar file system operations in the incremental context as well, we will create some utility functions for this first.</p>
 <p>Add the <code>fs</code> module to <code>pie/src/lib.rs</code>:</p>
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     let diff = String.raw`--- pie/src/lib.rs
@@ -384,7 +384,7 @@ <h1 id="requiring-files"><a class="header" href="#requiring-files">Requiring Fil
     └── Cargo.toml
 </code></pre>
 <p>To access these utility functions in the <code>pie</code> crate, add a dependency to <code>dev_shared</code> in <code>pie/Cargo.toml</code> along with another create that will help testing:</p>
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 <script>
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     let diff = String.raw`--- pie/Cargo.toml
@@ -490,7 +490,7 @@ <h1 id="requiring-files"><a class="header" href="#requiring-files">Requiring Fil
 </details>
 <p>Now we are done unwinding our stack and have filesystem and testing utilities.
 Make the non-incremental context compatible by changing <code>pie/src/context/non_incremental.rs</code>:</p>
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+<div class="diff2html" id="diff2html_3"></div>
 <script>
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     let diff = String.raw`--- pie/src/context/non_incremental.rs
diff --git a/2_incrementality/2_stamp/index.html b/2_incrementality/2_stamp/index.html
index c76838c..6ff6102 100644
--- a/2_incrementality/2_stamp/index.html
+++ b/2_incrementality/2_stamp/index.html
@@ -181,7 +181,7 @@ <h1 id="stamps"><a class="header" href="#stamps">Stamps</a></h1>
 A dependency is inconsistent if after stamping, the new stamp is different from the old stamp.
 Therefore, we will implement a <code>FileStamper</code> that stamps files and produces a <code>FileStamp</code>, and an <code>OutputStamper</code> that stamps task outputs and produces an <code>OutputStamp</code>.</p>
 <p>Add the <code>stamp</code> module to <code>pie/src/lib.rs</code>:</p>
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+<div class="diff2html" id="diff2html_0"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/lib.rs
@@ -386,7 +386,7 @@ <h2 id="testing-with-file-modified-time-correctly"><a class="header" href="#test
 Even worse, our test can be flaky, sometimes succeeding if we write in between those milliseconds, sometimes failing if we write within a millisecond.</p>
 <p>To solve this, add a function to the filesystem testing utility crate.
 Change <code>dev_shared/src/lib.rs</code>:</p>
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+<div class="diff2html" id="diff2html_1"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- dev_shared/src/lib.rs
@@ -446,7 +446,7 @@ <h2 id="testing-with-file-modified-time-correctly"><a class="header" href="#test
 </script>
 <p>The <code>write_until_modified</code> function writes to the file, but ensures its modified time will change.
 Now change the tests in <code>pie/src/stamp.rs</code> to use this function:</p>
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+<div class="diff2html" id="diff2html_2"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/stamp.rs
@@ -528,7 +528,7 @@ <h2 id="stamps-in-context"><a class="header" href="#stamps-in-context">Stamps in
 However, stampers are constructed by users of the library that author tasks, and they need to pass in these stampers when creating dependencies.
 Therefore, we need to update the <code>Context</code> trait to allow passing in these stampers.</p>
 <p>Change <code>Context</code> in <code>pie/src/lib.rs</code>:</p>
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+<div class="diff2html" id="diff2html_3"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/lib.rs
@@ -602,7 +602,7 @@ <h2 id="stamps-in-context"><a class="header" href="#stamps-in-context">Stamps in
 We add a default implementation for <code>require_file</code> that passes in a default stamper.
 The default is provided by <code>default_require_file_stamper</code> which can be overridden by context implementations.</p>
 <p>Now apply the same to tasks, changing <code>Context</code> again in <code>pie/src/lib.rs</code>:</p>
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 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/lib.rs
@@ -639,7 +639,7 @@ <h2 id="stamps-in-context"><a class="header" href="#stamps-in-context">Stamps in
   });
 </script>
 <p>Update <code>NonIncrementalContext</code> in <code>src/context/non_incremental.rs</code> to implement the new methods:</p>
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+<div class="diff2html" id="diff2html_5"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/context/non_incremental.rs
diff --git a/2_incrementality/3_dependency/index.html b/2_incrementality/3_dependency/index.html
index 8a50e0d..aca3cea 100644
--- a/2_incrementality/3_dependency/index.html
+++ b/2_incrementality/3_dependency/index.html
@@ -182,7 +182,7 @@ <h1 id="dynamic-dependencies"><a class="header" href="#dynamic-dependencies">Dyn
 To that end, we will implement the <code>FileDependency</code> and <code>TaskDependency</code> types with methods for consistency checking.
 We will also implement a <code>Dependency</code> type that abstracts over <code>FileDependency</code> and <code>TaskDependency</code>, which we will need for the dependency graph implementation in the next chapter.</p>
 <p>Add the <code>dependency</code> module to <code>pie/src/lib.rs</code>:</p>
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+<div class="diff2html" id="diff2html_0"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/lib.rs
diff --git a/2_incrementality/4_store/index.html b/2_incrementality/4_store/index.html
index dbe5174..9661260 100644
--- a/2_incrementality/4_store/index.html
+++ b/2_incrementality/4_store/index.html
@@ -194,7 +194,7 @@ <h1 id="dependency-graph-store"><a class="header" href="#dependency-graph-store"
 </div>
 </details>
 <p>Add the <code>pie_graph</code> dependency to <code>pie/Cargo.toml</code>:</p>
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+<div class="diff2html" id="diff2html_0"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/Cargo.toml
@@ -225,7 +225,7 @@ <h1 id="dependency-graph-store"><a class="header" href="#dependency-graph-store"
 </script>
 <h2 id="store-basics"><a class="header" href="#store-basics">Store basics</a></h2>
 <p>Add the <code>store</code> module to <code>pie/src/lib.rs</code>:</p>
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+<div class="diff2html" id="diff2html_1"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/lib.rs
@@ -315,7 +315,7 @@ <h2 id="graph-nodes"><a class="header" href="#graph-nodes">Graph nodes</a></h2>
 <p>To ensure unique nodes, we need to maintain the reverse mapping from <code>PathBuf</code> and <code>T</code> to <code>Node</code> ourselves, which we will do with <code>HashMap</code>s.
 This is also the reason for the <code>Eq</code> and <code>Hash</code> trait bounds on the <code>Task</code> trait, so we can use them as keys in <code>HashMap</code>s.</p>
 <p>Change <code>pie/src/store.rs</code> to add hash maps to map between these things:</p>
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+<div class="diff2html" id="diff2html_2"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/store.rs
@@ -371,7 +371,7 @@ <h2 id="graph-nodes"><a class="header" href="#graph-nodes">Graph nodes</a></h2>
   });
 </script>
 <p>To prevent accidentally using a file node as a task node, and vice versa, change <code>pie/src/store.rs</code> to add specific types of nodes:</p>
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+<div class="diff2html" id="diff2html_3"></div>
 <script>
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     let diff = String.raw`--- pie/src/store.rs
diff --git a/2_incrementality/5_context/index.html b/2_incrementality/5_context/index.html
index fc17130..5a40e5c 100644
--- a/2_incrementality/5_context/index.html
+++ b/2_incrementality/5_context/index.html
@@ -180,7 +180,7 @@ <h1 id="top-down-context"><a class="header" href="#top-down-context">Top-down Co
 Now we will create the <code>TopDownContext</code> type which implements the <code>Context</code> trait in an incremental way. </p>
 <h2 id="top-down-context-basics"><a class="header" href="#top-down-context-basics">Top-down context basics</a></h2>
 <p>Add the <code>top_down</code> module to <code>pie/src/context/mod.rs</code>:</p>
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+<div class="diff2html" id="diff2html_0"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/context/mod.rs
@@ -241,7 +241,7 @@ <h2 id="requiring-files"><a class="header" href="#requiring-files">Requiring fil
 This dependency will go from the <em>current executing task</em> to the file.
 Therefore, we will need to keep track of the current executing task.</p>
 <p>Change <code>pie/src/context/mod.rs</code> to add a field for tracking the current executing task, and use it in <code>require_file_with_stamper</code>:</p>
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+<div class="diff2html" id="diff2html_1"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -297,7 +297,7 @@ <h2 id="requiring-files"><a class="header" href="#requiring-files">Requiring fil
 In <code>require_file_with_stamper</code> we're now getting the current executing task.
 If there is no current executing task, which only happens if a user directly calls <code>require_file</code> on a context, we don't make a dependency and just open the file.</p>
 <p>Now we need to add the file dependency, change <code>pie/src/context/mod.rs</code> to do this: </p>
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 <script>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -336,7 +336,7 @@ <h2 id="requiring-tasks"><a class="header" href="#requiring-tasks">Requiring tas
 A task should be executed either if it's new (it does not have an output stored yet), or if at least one of its dependencies is inconsistent.
 If we don't execute it, then it must have an output value and all its dependencies are consistent, so we just return its output value.</p>
 <p>Change <code>pie/src/context/mod.rs</code> to implement this logic:</p>
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 <script>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -385,7 +385,7 @@ <h2 id="requiring-tasks"><a class="header" href="#requiring-tasks">Requiring tas
 Otherwise, we get the output of the task from the store, which cannot panic because <code>should_execute_task</code> ensures that the task has an output if it returns false.
 Finally, we return the output.</p>
 <p>We still need to create a task dependency. Change <code>pie/src/context/mod.rs</code> to add the dependency:</p>
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 <script>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -468,7 +468,7 @@ <h2 id="requiring-tasks"><a class="header" href="#requiring-tasks">Requiring tas
 <h2 id="checking-tasks"><a class="header" href="#checking-tasks">Checking tasks</a></h2>
 <p>The final piece to our puzzle is the <code>should_execute_task</code> implementation.</p>
 <p>Add the following code to <code>pie/src/context/top_down.rs</code>:</p>
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+<div class="diff2html" id="diff2html_5"></div>
 <script>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -583,7 +583,7 @@ <h2 id="checking-tasks"><a class="header" href="#checking-tasks">Checking tasks<
 We've ignored the case where <code>dependency.is_inconsistent</code> returns <code>Err</code>.
 When dependency checking result in an error, we should store the error for the user to investigate, and assume the dependency is inconsistent.</p>
 <p>Change <code>pie/src/context/mod.rs</code> to store dependency check errors and give users access to it:</p>
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+<div class="diff2html" id="diff2html_6"></div>
 <script>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -625,7 +625,7 @@ <h2 id="checking-tasks"><a class="header" href="#checking-tasks">Checking tasks<
   });
 </script>
 <p>And then change <code>pie/src/context/mod.rs</code> to store these errors:</p>
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+<div class="diff2html" id="diff2html_7"></div>
 <script>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -805,7 +805,7 @@ <h3 id="exploring-incrementality"><a class="header" href="#exploring-incremental
 You should see the <code>println!</code> in <code>ReadStringFromFile</code> appear in your console as the incremental context correctly determines that this task is new (i.e., has no output) and must be executed.
 It should look something like:</p>
 <pre><code>   Compiling pie v0.1.0 (/pie)
-    Finished dev [unoptimized + debuginfo] target(s) in 1.38s
+    Finished dev [unoptimized + debuginfo] target(s) in 1.42s
      Running `/pie/target/debug/examples/incremental`
 A) New task: expect `read_task` to execute
 Reading from input.txt with Modified stamper
@@ -821,7 +821,7 @@ <h4 id="reuse"><a class="header" href="#reuse">Reuse</a></h4>
 </code></pre>
 <p>Running with <code>cargo run --example incremental</code> should produce output like:</p>
 <pre><code>   Compiling pie v0.1.0 (/pie)
-    Finished dev [unoptimized + debuginfo] target(s) in 0.66s
+    Finished dev [unoptimized + debuginfo] target(s) in 0.69s
      Running `/pie/target/debug/examples/incremental`
 A) New task: expect `read_task` to execute
 Reading from input.txt with Modified stamper
@@ -974,7 +974,7 @@ <h4 id="same-file-different-stampers"><a class="header" href="#same-file-differe
 <p>Of course, using an <code>Exists</code> stamper for <code>ReadStringFromFile</code> does not make a lot of sense, but this is for demonstration purposes only.</p>
 <p>Running <code>cargo run --example incremental</code> now should produce output like:</p>
 <pre><code>   Compiling pie v0.1.0 (/pie)
-    Finished dev [unoptimized + debuginfo] target(s) in 0.78s
+    Finished dev [unoptimized + debuginfo] target(s) in 0.81s
      Running `/pie/target/debug/examples/incremental`
 A) New task: expect `read_task` to execute
 Reading from input.txt with Modified stamper
diff --git a/3_min_sound/1_session/index.html b/3_min_sound/1_session/index.html
index eb44df2..978f40b 100644
--- a/3_min_sound/1_session/index.html
+++ b/3_min_sound/1_session/index.html
@@ -189,7 +189,7 @@ <h1 id="minimality-with-sessions"><a class="header" href="#minimality-with-sessi
 <p>We will implement the <code>Session</code> type to hold all session data, and the <code>Pie</code> type as an entry point into the build system that manages a session.</p>
 <h2 id="pie-and-session"><a class="header" href="#pie-and-session">PIE and Session</a></h2>
 <p>Change the imports in <code>pie/src/lib.rs</code>: </p>
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+<div class="diff2html" id="diff2html_0"></div>
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     let diff = String.raw`--- pie/src/lib.rs
@@ -276,7 +276,7 @@ <h2 id="pie-and-session"><a class="header" href="#pie-and-session">PIE and Sessi
 <p>Now we need to modify <code>TopDownContext</code> to work with <code>Session</code>.</p>
 <h2 id="update-topdowncontext"><a class="header" href="#update-topdowncontext">Update TopDownContext</a></h2>
 <p>Change <code>TopDownContext</code> to only contain a mutable reference to <code>Session</code> in <code>pie/src/context/top_down.rs</code>:</p>
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+<div class="diff2html" id="diff2html_1"></div>
 <script>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -339,7 +339,7 @@ <h2 id="update-topdowncontext"><a class="header" href="#update-topdowncontext">U
 <p>In the rest of the file, we need to update the <code>impl</code> lines to include the lifetimes, and we need to replace most instances of <code>self</code> with <code>self.session</code>.
 You could do this with the following find-replace regex: <code>self\.([\w\d_]+)\.</code> -&gt; <code>self.session.$1.</code></p>
 <p>Change <code>pie/src/context/top_down.rs</code>:</p>
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+<div class="diff2html" id="diff2html_2"></div>
 <script>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -446,7 +446,7 @@ <h2 id="update-topdowncontext"><a class="header" href="#update-topdowncontext">U
 <p>Now we change <code>Session</code> to use <code>TopDownContext</code>. </p>
 <h2 id="update-session"><a class="header" href="#update-session">Update Session</a></h2>
 <p>Change <code>pie/src/lib.rs</code>:</p>
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+<div class="diff2html" id="diff2html_3"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/lib.rs
@@ -479,7 +479,7 @@ <h2 id="update-session"><a class="header" href="#update-session">Update Session<
 Then, we just create a <code>TopDownContext</code> and call <code>require_initial</code>.</p>
 <p>Finally, we can now make the <code>context</code> module private, as users of the library run builds using <code>Session</code>, instead of having to create a context implementation.
 Change <code>pie/src/lib.rs</code>:</p>
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     let diff = String.raw`--- pie/src/lib.rs
@@ -512,7 +512,7 @@ <h2 id="update-session"><a class="header" href="#update-session">Update Session<
 We need to update the incrementality example to work with these changes.</p>
 <h2 id="update-incremental-example"><a class="header" href="#update-incremental-example">Update incremental example</a></h2>
 <p>First change some imports in <code>pie/examples/incremental.rs</code>:</p>
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 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/examples/incremental.rs
@@ -542,7 +542,7 @@ <h2 id="update-incremental-example"><a class="header" href="#update-incremental-
   });
 </script>
 <p>Then, change <code>pie/examples/incremental.rs</code> to use sessions:</p>
-<div id="diff2html_6"></div>
+<div class="diff2html" id="diff2html_6"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/examples/incremental.rs
diff --git a/3_min_sound/2_tracker/index.html b/3_min_sound/2_tracker/index.html
index 73b8f61..96d69ad 100644
--- a/3_min_sound/2_tracker/index.html
+++ b/3_min_sound/2_tracker/index.html
@@ -189,7 +189,7 @@ <h1 id="tracking-build-events"><a class="header" href="#tracking-build-events">T
 </ol>
 <h2 id="tracker-trait"><a class="header" href="#tracker-trait"><code>Tracker</code> trait</a></h2>
 <p>Add the <code>tracker</code> module to <code>pie/src/lib.rs</code>:</p>
-<div id="diff2html_0"></div>
+<div class="diff2html" id="diff2html_0"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/lib.rs
@@ -295,7 +295,7 @@ <h2 id="no-op-tracker"><a class="header" href="#no-op-tracker">No-op tracker</a>
 <h2 id="using-the-tracker-trait"><a class="header" href="#using-the-tracker-trait">Using the <code>Tracker</code> trait</a></h2>
 <p>Now we will make the build system generic over <code>Tracker</code>, and insert <code>Tracker</code> calls in context implementations.</p>
 <p>Make <code>Pie</code> and <code>Session</code> generic over <code>Tracker</code> by modifying <code>pie/src/lib.rs</code>:</p>
-<div id="diff2html_1"></div>
+<div class="diff2html" id="diff2html_1"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/lib.rs
@@ -430,7 +430,7 @@ <h2 id="using-the-tracker-trait"><a class="header" href="#using-the-tracker-trai
 For convenience, <code>Session</code> also provides access to the tracker with <code>tracker</code> and <code>tracker_mut</code>.</p>
 <p>Now we make <code>TopDownContext</code> generic over <code>Tracker</code>, and insert calls to tracker methods.
 Modify <code>pie/src/context/top_down.rs</code>:</p>
-<div id="diff2html_2"></div>
+<div class="diff2html" id="diff2html_2"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -560,7 +560,7 @@ <h2 id="implement-writing-tracker"><a class="header" href="#implement-writing-tr
 <p>Now we can implement some interesting trackers.
 We start with a simple <code>WritingTracker</code> that writes build events to some writer.</p>
 <p>Add the <code>writing</code> module to <code>pie/src/tracker/mod.rs</code>:</p>
-<div id="diff2html_3"></div>
+<div class="diff2html" id="diff2html_3"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/tracker/mod.rs
@@ -712,7 +712,7 @@ <h2 id="implement-writing-tracker"><a class="header" href="#implement-writing-tr
 But in this tutorial, we will keep it simple like this.</p>
 <p>Check that the code compiles with <code>cargo test</code>.</p>
 <p>Let's try out our writing tracker in the incrementality example by modifying <code>pie/examples/incremental.rs</code>:</p>
-<div id="diff2html_4"></div>
+<div class="diff2html" id="diff2html_4"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/examples/incremental.rs
@@ -798,7 +798,7 @@ <h2 id="implement-event-tracker"><a class="header" href="#implement-event-tracke
 To check incrementality and soundness, we need to be able to check whether a task has executed or not, and check the order of build events.
 Therefore, we will implement the <code>EventTracker</code> that stores build events for later inspection.</p>
 <p>Add the <code>event</code> module to <code>pie/src/tracker/mod.rs</code>:</p>
-<div id="diff2html_5"></div>
+<div class="diff2html" id="diff2html_5"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/tracker/mod.rs
diff --git a/css/general.css b/css/general.css
index 8fc79cf..94b2c5e 100644
--- a/css/general.css
+++ b/css/general.css
@@ -27,6 +27,9 @@ code {
   font-size: var(--code-font-size);
   /* CHANGE: set background here, instead of it being defined on .hljs in highlight.js */
   background-color: var(--code-bg);
+  /* CHANGE: make resizable */
+  resize: horizontal;
+  overflow-x: auto;
 }
 
 pre > code {
diff --git a/css/variables.css b/css/variables.css
index ec335de..b6b86b4 100644
--- a/css/variables.css
+++ b/css/variables.css
@@ -3,7 +3,7 @@
 :root {
   --sidebar-width: 300px;
   --page-padding: 15px;
-  --content-max-width: 1200px;
+  --content-max-width: 1000px;
   --menu-bar-height: 50px;
   --mono-font: "Source Code Pro", Consolas, "Ubuntu Mono", Menlo, "DejaVu Sans Mono", monospace, monospace;
   --code-font-size: 0.875em /* please adjust the ace font size accordingly in editor.js */
diff --git a/diff2html.min.css b/diff2html.min.css
index 29b1140..3c73408 100644
--- a/diff2html.min.css
+++ b/diff2html.min.css
@@ -71,7 +71,10 @@
   border: 1px solid var(--code-border-color);
   /* CHANGE: remove radius */
   /*border-radius: 3px;*/
-  margin-bottom: 1em
+  margin-bottom: 1em;
+  /* CHANGE: make resizable */
+  resize: horizontal;
+  overflow-x: auto;
 }
 
 .d2h-file-collapse {
diff --git a/gen/1_programmability/0_setup/source.zip b/gen/1_programmability/0_setup/source.zip
index 81cad36..a68a025 100644
Binary files a/gen/1_programmability/0_setup/source.zip and b/gen/1_programmability/0_setup/source.zip differ
diff --git a/gen/1_programmability/1_api/source.zip b/gen/1_programmability/1_api/source.zip
index a2115cf..36db459 100644
Binary files a/gen/1_programmability/1_api/source.zip and b/gen/1_programmability/1_api/source.zip differ
diff --git a/gen/1_programmability/2_non_incremental/d_cargo.txt b/gen/1_programmability/2_non_incremental/d_cargo.txt
index 3711920..9d3b863 100644
--- a/gen/1_programmability/2_non_incremental/d_cargo.txt
+++ b/gen/1_programmability/2_non_incremental/d_cargo.txt
@@ -1,5 +1,5 @@
    Compiling pie v0.1.0 (/pie)
-    Finished test [unoptimized + debuginfo] target(s) in 0.44s
+    Finished test [unoptimized + debuginfo] target(s) in 0.47s
      Running unittests src/lib.rs (/pie/target/debug/deps/pie-6c9d55a7ef727e00)
 
 running 1 test
diff --git a/gen/1_programmability/2_non_incremental/source.zip b/gen/1_programmability/2_non_incremental/source.zip
index 84c2be9..3c4b432 100644
Binary files a/gen/1_programmability/2_non_incremental/source.zip and b/gen/1_programmability/2_non_incremental/source.zip differ
diff --git a/gen/2_incrementality/1_require_file/source.zip b/gen/2_incrementality/1_require_file/source.zip
index 18a9a4f..db3e459 100644
Binary files a/gen/2_incrementality/1_require_file/source.zip and b/gen/2_incrementality/1_require_file/source.zip differ
diff --git a/gen/2_incrementality/2_stamp/source.zip b/gen/2_incrementality/2_stamp/source.zip
index 95641ca..2cceadc 100644
Binary files a/gen/2_incrementality/2_stamp/source.zip and b/gen/2_incrementality/2_stamp/source.zip differ
diff --git a/gen/2_incrementality/3_dependency/source.zip b/gen/2_incrementality/3_dependency/source.zip
index eb3385f..9e4d76a 100644
Binary files a/gen/2_incrementality/3_dependency/source.zip and b/gen/2_incrementality/3_dependency/source.zip differ
diff --git a/gen/2_incrementality/4_store/source.zip b/gen/2_incrementality/4_store/source.zip
index 78ffa3c..2173bf4 100644
Binary files a/gen/2_incrementality/4_store/source.zip and b/gen/2_incrementality/4_store/source.zip differ
diff --git a/gen/2_incrementality/5b_context_example/d_main.txt b/gen/2_incrementality/5b_context_example/d_main.txt
index 87241de..750b17c 100644
--- a/gen/2_incrementality/5b_context_example/d_main.txt
+++ b/gen/2_incrementality/5b_context_example/d_main.txt
@@ -1,5 +1,5 @@
    Compiling pie v0.1.0 (/pie)
-    Finished dev [unoptimized + debuginfo] target(s) in 1.38s
+    Finished dev [unoptimized + debuginfo] target(s) in 1.42s
      Running `/pie/target/debug/examples/incremental`
 A) New task: expect `read_task` to execute
 Reading from input.txt with Modified stamper
diff --git a/gen/2_incrementality/5b_context_example/e_reuse.txt b/gen/2_incrementality/5b_context_example/e_reuse.txt
index 6648297..f73038a 100644
--- a/gen/2_incrementality/5b_context_example/e_reuse.txt
+++ b/gen/2_incrementality/5b_context_example/e_reuse.txt
@@ -1,5 +1,5 @@
    Compiling pie v0.1.0 (/pie)
-    Finished dev [unoptimized + debuginfo] target(s) in 0.66s
+    Finished dev [unoptimized + debuginfo] target(s) in 0.69s
      Running `/pie/target/debug/examples/incremental`
 A) New task: expect `read_task` to execute
 Reading from input.txt with Modified stamper
diff --git a/gen/2_incrementality/5b_context_example/l_diff_stamp.txt b/gen/2_incrementality/5b_context_example/l_diff_stamp.txt
index 2ad943a..3728968 100644
--- a/gen/2_incrementality/5b_context_example/l_diff_stamp.txt
+++ b/gen/2_incrementality/5b_context_example/l_diff_stamp.txt
@@ -1,5 +1,5 @@
    Compiling pie v0.1.0 (/pie)
-    Finished dev [unoptimized + debuginfo] target(s) in 0.78s
+    Finished dev [unoptimized + debuginfo] target(s) in 0.81s
      Running `/pie/target/debug/examples/incremental`
 A) New task: expect `read_task` to execute
 Reading from input.txt with Modified stamper
diff --git a/gen/2_incrementality/5b_context_example/source.zip b/gen/2_incrementality/5b_context_example/source.zip
index 1c7934c..ddcdcf2 100644
Binary files a/gen/2_incrementality/5b_context_example/source.zip and b/gen/2_incrementality/5b_context_example/source.zip differ
diff --git a/gen/3_min_sound/1_session/source.zip b/gen/3_min_sound/1_session/source.zip
index 8c3b547..c575933 100644
Binary files a/gen/3_min_sound/1_session/source.zip and b/gen/3_min_sound/1_session/source.zip differ
diff --git a/gen/3_min_sound/2_tracker/i_writing_example.txt b/gen/3_min_sound/2_tracker/i_writing_example.txt
index d2a5b24..f2b2497 100644
--- a/gen/3_min_sound/2_tracker/i_writing_example.txt
+++ b/gen/3_min_sound/2_tracker/i_writing_example.txt
@@ -1,53 +1,53 @@
    Compiling pie v0.1.0 (/pie)
-    Finished dev [unoptimized + debuginfo] target(s) in 0.94s
+    Finished dev [unoptimized + debuginfo] target(s) in 0.90s
      Running `/pie/target/debug/examples/incremental`
 A) New task: expect `read_task` to execute
-→ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified))
+→ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified))
 ← Ok("Hi")
 
 B) Reuse: expect no execution
-✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified))
+✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified))
 
 C) Inconsistent file dependency: expect `read_task` to execute
-→ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified))
+→ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified))
 ← Ok("Hello")
 
 D) New task, reuse other: expect only `write_task` to execute
-→ WriteStringToFile(WriteStringToFile(ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified)), "/tmp/.tmpM6oCgR/output.txt", Modified))
- ✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified))
+→ WriteStringToFile(WriteStringToFile(ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified)), "/tmp/.tmpYP32ZN/output.txt", Modified))
+ ✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified))
 ← Ok("")
 
 E) Inconsistent file and task dependency: expect both tasks to execute
-→ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified))
+→ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified))
 ← Ok("Hello, World!")
-→ WriteStringToFile(WriteStringToFile(ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified)), "/tmp/.tmpM6oCgR/output.txt", Modified))
- ✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified))
+→ WriteStringToFile(WriteStringToFile(ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified)), "/tmp/.tmpYP32ZN/output.txt", Modified))
+ ✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified))
 ← Ok("")
 
 F) Early cutoff: expect only `read_task` to execute
-→ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified))
+→ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified))
 ← Ok("Hello, World!")
-✓ WriteStringToFile(WriteStringToFile(ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified)), "/tmp/.tmpM6oCgR/output.txt", Modified))
+✓ WriteStringToFile(WriteStringToFile(ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified)), "/tmp/.tmpYP32ZN/output.txt", Modified))
 
 G) Regenerate changed output file: expect only `write_task` to execute
-✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified))
-→ WriteStringToFile(WriteStringToFile(ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified)), "/tmp/.tmpM6oCgR/output.txt", Modified))
- ✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified))
+✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified))
+→ WriteStringToFile(WriteStringToFile(ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified)), "/tmp/.tmpYP32ZN/output.txt", Modified))
+ ✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified))
 ← Ok("")
 
 H) Regenerate deleted output file: expect only `write_task` to execute
-✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified))
-→ WriteStringToFile(WriteStringToFile(ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified)), "/tmp/.tmpM6oCgR/output.txt", Modified))
- ✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input.txt", Modified))
+✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified))
+→ WriteStringToFile(WriteStringToFile(ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified)), "/tmp/.tmpYP32ZN/output.txt", Modified))
+ ✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input.txt", Modified))
 ← Ok("")
 
 I) Different tasks: expect `read_task_b_modified` and `read_task_b_exists` to execute
-→ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input_b.txt", Modified))
+→ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input_b.txt", Modified))
 ← Ok("Test")
-→ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input_b.txt", Exists))
+→ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input_b.txt", Exists))
 ← Ok("Test")
 
 J) Different stampers: expect only `read_task_b_modified` to execute
-→ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input_b.txt", Modified))
+→ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input_b.txt", Modified))
 ← Ok("Test Test")
-✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpM6oCgR/input_b.txt", Exists))
+✓ ReadStringFromFile(ReadStringFromFile("/tmp/.tmpYP32ZN/input_b.txt", Exists))
diff --git a/gen/3_min_sound/2_tracker/source.zip b/gen/3_min_sound/2_tracker/source.zip
index 419a3f1..6496e68 100644
Binary files a/gen/3_min_sound/2_tracker/source.zip and b/gen/3_min_sound/2_tracker/source.zip differ
diff --git a/print.html b/print.html
index 90bf258..583a37c 100644
--- a/print.html
+++ b/print.html
@@ -320,7 +320,7 @@ <h2 id="api-implementation"><a class="header" href="#api-implementation">API Imp
 <h2 id="context-module"><a class="header" href="#context-module">Context module</a></h2>
 <p>Since we will be implementing three different contexts in this tutorial, we will separate them in different modules.
 Create the <code>context</code> module by adding a module to <code>pie/src/lib.rs</code>:</p>
-<div id="diff2html_0"></div>
+<div class="diff2html" id="diff2html_0"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/lib.rs
@@ -439,7 +439,7 @@ <h2 id="simple-test"><a class="header" href="#simple-test">Simple Test</a></h2>
 <p>Run the test by running <code>cargo test</code>.
 The output should look something like:</p>
 <pre><code class="language-shell ">   Compiling pie v0.1.0 (/pie)
-    Finished test [unoptimized + debuginfo] target(s) in 0.44s
+    Finished test [unoptimized + debuginfo] target(s) in 0.47s
      Running unittests src/lib.rs (/pie/target/debug/deps/pie-6c9d55a7ef727e00)
 
 running 1 test
@@ -480,7 +480,7 @@ <h2 id="simple-test"><a class="header" href="#simple-test">Simple Test</a></h2>
 <h2 id="test-with-multiple-tasks"><a class="header" href="#test-with-multiple-tasks">Test with Multiple Tasks</a></h2>
 <p>Our first test only tests a single task that does not use the context, so let's write a test with two tasks where one requires the other to increase our test coverage.
 Add the following test:</p>
-<div id="diff2html_1"></div>
+<div class="diff2html" id="diff2html_1"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/context/non_incremental.rs
@@ -554,7 +554,7 @@ <h2 id="test-with-multiple-tasks"><a class="header" href="#test-with-multiple-ta
 <p>The problem is that <code>execute</code> of <code>ToLowerCase</code> takes a <code>Context&lt;Self&gt;</code>, so in <code>impl Task for ToLowerCase</code> it takes a <code>Context&lt;ToLowerCase&gt;</code>, while we're trying to require <code>&amp;ReturnHelloWorld</code> through the context.
 This doesn't work as <code>Context&lt;ToLowerCase&gt;::require_task</code> only takes a <code>&amp;ToLowerCase</code> as input.</p>
 <p>We could change <code>execute</code> of <code>ToLowerCase</code> to take <code>Context&lt;ReturnHelloWorld&gt;</code>:</p>
-<div id="diff2html_2"></div>
+<div class="diff2html" id="diff2html_2"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/context/non_incremental.rs
@@ -626,7 +626,7 @@ <h2 id="test-with-multiple-tasks"><a class="header" href="#test-with-multiple-ta
 </details>
 <p>For now, we will solve this by just using a single task type which is an enumeration of the different possible tasks.
 Replace the test with the following:</p>
-<div id="diff2html_3"></div>
+<div class="diff2html" id="diff2html_3"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- original
@@ -752,7 +752,7 @@ <h2 id="test-with-multiple-tasks"><a class="header" href="#test-with-multiple-ta
 <p>Since build systems frequently interact with files, and changes to files can affect tasks, we need to keep track of file dependencies.
 Therefore, we will extend the <code>Context</code> API with methods to <em>require files</em>, enabling tasks to specify dynamic dependencies to files.</p>
 <p>Add a method to the <code>Context</code> trait in <code>pie/src/lib.rs</code>:</p>
-<div id="diff2html_0"></div>
+<div class="diff2html" id="diff2html_0"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/lib.rs
@@ -830,7 +830,7 @@ <h2 id="test-with-multiple-tasks"><a class="header" href="#test-with-multiple-ta
 <p>Now we need to implement this method for <code>NonIncrementalContext</code>.
 However, because we will be performing similar file system operations in the incremental context as well, we will create some utility functions for this first.</p>
 <p>Add the <code>fs</code> module to <code>pie/src/lib.rs</code>:</p>
-<div id="diff2html_1"></div>
+<div class="diff2html" id="diff2html_1"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/lib.rs
@@ -957,7 +957,7 @@ <h2 id="test-with-multiple-tasks"><a class="header" href="#test-with-multiple-ta
     └── Cargo.toml
 </code></pre>
 <p>To access these utility functions in the <code>pie</code> crate, add a dependency to <code>dev_shared</code> in <code>pie/Cargo.toml</code> along with another create that will help testing:</p>
-<div id="diff2html_2"></div>
+<div class="diff2html" id="diff2html_2"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/Cargo.toml
@@ -1063,7 +1063,7 @@ <h2 id="test-with-multiple-tasks"><a class="header" href="#test-with-multiple-ta
 </details>
 <p>Now we are done unwinding our stack and have filesystem and testing utilities.
 Make the non-incremental context compatible by changing <code>pie/src/context/non_incremental.rs</code>:</p>
-<div id="diff2html_3"></div>
+<div class="diff2html" id="diff2html_3"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/context/non_incremental.rs
@@ -1117,7 +1117,7 @@ <h2 id="test-with-multiple-tasks"><a class="header" href="#test-with-multiple-ta
 A dependency is inconsistent if after stamping, the new stamp is different from the old stamp.
 Therefore, we will implement a <code>FileStamper</code> that stamps files and produces a <code>FileStamp</code>, and an <code>OutputStamper</code> that stamps task outputs and produces an <code>OutputStamp</code>.</p>
 <p>Add the <code>stamp</code> module to <code>pie/src/lib.rs</code>:</p>
-<div id="diff2html_0"></div>
+<div class="diff2html" id="diff2html_0"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/lib.rs
@@ -1322,7 +1322,7 @@ <h2 id="testing-with-file-modified-time-correctly"><a class="header" href="#test
 Even worse, our test can be flaky, sometimes succeeding if we write in between those milliseconds, sometimes failing if we write within a millisecond.</p>
 <p>To solve this, add a function to the filesystem testing utility crate.
 Change <code>dev_shared/src/lib.rs</code>:</p>
-<div id="diff2html_1"></div>
+<div class="diff2html" id="diff2html_1"></div>
 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- dev_shared/src/lib.rs
@@ -1382,7 +1382,7 @@ <h2 id="testing-with-file-modified-time-correctly"><a class="header" href="#test
 </script>
 <p>The <code>write_until_modified</code> function writes to the file, but ensures its modified time will change.
 Now change the tests in <code>pie/src/stamp.rs</code> to use this function:</p>
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     let diff = String.raw`--- pie/src/stamp.rs
@@ -1464,7 +1464,7 @@ <h2 id="stamps-in-context"><a class="header" href="#stamps-in-context">Stamps in
 However, stampers are constructed by users of the library that author tasks, and they need to pass in these stampers when creating dependencies.
 Therefore, we need to update the <code>Context</code> trait to allow passing in these stampers.</p>
 <p>Change <code>Context</code> in <code>pie/src/lib.rs</code>:</p>
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     let diff = String.raw`--- pie/src/lib.rs
@@ -1538,7 +1538,7 @@ <h2 id="stamps-in-context"><a class="header" href="#stamps-in-context">Stamps in
 We add a default implementation for <code>require_file</code> that passes in a default stamper.
 The default is provided by <code>default_require_file_stamper</code> which can be overridden by context implementations.</p>
 <p>Now apply the same to tasks, changing <code>Context</code> again in <code>pie/src/lib.rs</code>:</p>
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     let diff = String.raw`--- pie/src/lib.rs
@@ -1575,7 +1575,7 @@ <h2 id="stamps-in-context"><a class="header" href="#stamps-in-context">Stamps in
   });
 </script>
 <p>Update <code>NonIncrementalContext</code> in <code>src/context/non_incremental.rs</code> to implement the new methods:</p>
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     let diff = String.raw`--- pie/src/context/non_incremental.rs
@@ -1633,7 +1633,7 @@ <h2 id="stamps-in-context"><a class="header" href="#stamps-in-context">Stamps in
 To that end, we will implement the <code>FileDependency</code> and <code>TaskDependency</code> types with methods for consistency checking.
 We will also implement a <code>Dependency</code> type that abstracts over <code>FileDependency</code> and <code>TaskDependency</code>, which we will need for the dependency graph implementation in the next chapter.</p>
 <p>Add the <code>dependency</code> module to <code>pie/src/lib.rs</code>:</p>
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     let diff = String.raw`--- pie/src/lib.rs
@@ -1980,7 +1980,7 @@ <h2 id="tests-1"><a class="header" href="#tests-1">Tests</a></h2>
 </div>
 </details>
 <p>Add the <code>pie_graph</code> dependency to <code>pie/Cargo.toml</code>:</p>
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     let diff = String.raw`--- pie/Cargo.toml
@@ -2011,7 +2011,7 @@ <h2 id="tests-1"><a class="header" href="#tests-1">Tests</a></h2>
 </script>
 <h2 id="store-basics"><a class="header" href="#store-basics">Store basics</a></h2>
 <p>Add the <code>store</code> module to <code>pie/src/lib.rs</code>:</p>
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     let diff = String.raw`--- pie/src/lib.rs
@@ -2101,7 +2101,7 @@ <h2 id="graph-nodes"><a class="header" href="#graph-nodes">Graph nodes</a></h2>
 <p>To ensure unique nodes, we need to maintain the reverse mapping from <code>PathBuf</code> and <code>T</code> to <code>Node</code> ourselves, which we will do with <code>HashMap</code>s.
 This is also the reason for the <code>Eq</code> and <code>Hash</code> trait bounds on the <code>Task</code> trait, so we can use them as keys in <code>HashMap</code>s.</p>
 <p>Change <code>pie/src/store.rs</code> to add hash maps to map between these things:</p>
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     let diff = String.raw`--- pie/src/store.rs
@@ -2157,7 +2157,7 @@ <h2 id="graph-nodes"><a class="header" href="#graph-nodes">Graph nodes</a></h2>
   });
 </script>
 <p>To prevent accidentally using a file node as a task node, and vice versa, change <code>pie/src/store.rs</code> to add specific types of nodes:</p>
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     let diff = String.raw`--- pie/src/store.rs
@@ -2781,7 +2781,7 @@ <h3 id="testing-task-reset"><a class="header" href="#testing-task-reset">Testing
 Now we will create the <code>TopDownContext</code> type which implements the <code>Context</code> trait in an incremental way. </p>
 <h2 id="top-down-context-basics"><a class="header" href="#top-down-context-basics">Top-down context basics</a></h2>
 <p>Add the <code>top_down</code> module to <code>pie/src/context/mod.rs</code>:</p>
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     let diff = String.raw`--- pie/src/context/mod.rs
@@ -2842,7 +2842,7 @@ <h2 id="requiring-files-1"><a class="header" href="#requiring-files-1">Requiring
 This dependency will go from the <em>current executing task</em> to the file.
 Therefore, we will need to keep track of the current executing task.</p>
 <p>Change <code>pie/src/context/mod.rs</code> to add a field for tracking the current executing task, and use it in <code>require_file_with_stamper</code>:</p>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -2898,7 +2898,7 @@ <h2 id="requiring-files-1"><a class="header" href="#requiring-files-1">Requiring
 In <code>require_file_with_stamper</code> we're now getting the current executing task.
 If there is no current executing task, which only happens if a user directly calls <code>require_file</code> on a context, we don't make a dependency and just open the file.</p>
 <p>Now we need to add the file dependency, change <code>pie/src/context/mod.rs</code> to do this: </p>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -2937,7 +2937,7 @@ <h2 id="requiring-tasks"><a class="header" href="#requiring-tasks">Requiring tas
 A task should be executed either if it's new (it does not have an output stored yet), or if at least one of its dependencies is inconsistent.
 If we don't execute it, then it must have an output value and all its dependencies are consistent, so we just return its output value.</p>
 <p>Change <code>pie/src/context/mod.rs</code> to implement this logic:</p>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -2986,7 +2986,7 @@ <h2 id="requiring-tasks"><a class="header" href="#requiring-tasks">Requiring tas
 Otherwise, we get the output of the task from the store, which cannot panic because <code>should_execute_task</code> ensures that the task has an output if it returns false.
 Finally, we return the output.</p>
 <p>We still need to create a task dependency. Change <code>pie/src/context/mod.rs</code> to add the dependency:</p>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -3069,7 +3069,7 @@ <h2 id="requiring-tasks"><a class="header" href="#requiring-tasks">Requiring tas
 <h2 id="checking-tasks"><a class="header" href="#checking-tasks">Checking tasks</a></h2>
 <p>The final piece to our puzzle is the <code>should_execute_task</code> implementation.</p>
 <p>Add the following code to <code>pie/src/context/top_down.rs</code>:</p>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -3184,7 +3184,7 @@ <h2 id="checking-tasks"><a class="header" href="#checking-tasks">Checking tasks<
 We've ignored the case where <code>dependency.is_inconsistent</code> returns <code>Err</code>.
 When dependency checking result in an error, we should store the error for the user to investigate, and assume the dependency is inconsistent.</p>
 <p>Change <code>pie/src/context/mod.rs</code> to store dependency check errors and give users access to it:</p>
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   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -3226,7 +3226,7 @@ <h2 id="checking-tasks"><a class="header" href="#checking-tasks">Checking tasks<
   });
 </script>
 <p>And then change <code>pie/src/context/mod.rs</code> to store these errors:</p>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -3406,7 +3406,7 @@ <h3 id="exploring-incrementality"><a class="header" href="#exploring-incremental
 You should see the <code>println!</code> in <code>ReadStringFromFile</code> appear in your console as the incremental context correctly determines that this task is new (i.e., has no output) and must be executed.
 It should look something like:</p>
 <pre><code>   Compiling pie v0.1.0 (/pie)
-    Finished dev [unoptimized + debuginfo] target(s) in 1.38s
+    Finished dev [unoptimized + debuginfo] target(s) in 1.42s
      Running `/pie/target/debug/examples/incremental`
 A) New task: expect `read_task` to execute
 Reading from input.txt with Modified stamper
@@ -3422,7 +3422,7 @@ <h4 id="reuse"><a class="header" href="#reuse">Reuse</a></h4>
 </code></pre>
 <p>Running with <code>cargo run --example incremental</code> should produce output like:</p>
 <pre><code>   Compiling pie v0.1.0 (/pie)
-    Finished dev [unoptimized + debuginfo] target(s) in 0.66s
+    Finished dev [unoptimized + debuginfo] target(s) in 0.69s
      Running `/pie/target/debug/examples/incremental`
 A) New task: expect `read_task` to execute
 Reading from input.txt with Modified stamper
@@ -3575,7 +3575,7 @@ <h4 id="same-file-different-stampers"><a class="header" href="#same-file-differe
 <p>Of course, using an <code>Exists</code> stamper for <code>ReadStringFromFile</code> does not make a lot of sense, but this is for demonstration purposes only.</p>
 <p>Running <code>cargo run --example incremental</code> now should produce output like:</p>
 <pre><code>   Compiling pie v0.1.0 (/pie)
-    Finished dev [unoptimized + debuginfo] target(s) in 0.78s
+    Finished dev [unoptimized + debuginfo] target(s) in 0.81s
      Running `/pie/target/debug/examples/incremental`
 A) New task: expect `read_task` to execute
 Reading from input.txt with Modified stamper
@@ -3683,7 +3683,7 @@ <h4 id="same-file-different-stampers"><a class="header" href="#same-file-differe
 <p>We will implement the <code>Session</code> type to hold all session data, and the <code>Pie</code> type as an entry point into the build system that manages a session.</p>
 <h2 id="pie-and-session"><a class="header" href="#pie-and-session">PIE and Session</a></h2>
 <p>Change the imports in <code>pie/src/lib.rs</code>: </p>
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     let diff = String.raw`--- pie/src/lib.rs
@@ -3770,7 +3770,7 @@ <h2 id="pie-and-session"><a class="header" href="#pie-and-session">PIE and Sessi
 <p>Now we need to modify <code>TopDownContext</code> to work with <code>Session</code>.</p>
 <h2 id="update-topdowncontext"><a class="header" href="#update-topdowncontext">Update TopDownContext</a></h2>
 <p>Change <code>TopDownContext</code> to only contain a mutable reference to <code>Session</code> in <code>pie/src/context/top_down.rs</code>:</p>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -3833,7 +3833,7 @@ <h2 id="update-topdowncontext"><a class="header" href="#update-topdowncontext">U
 <p>In the rest of the file, we need to update the <code>impl</code> lines to include the lifetimes, and we need to replace most instances of <code>self</code> with <code>self.session</code>.
 You could do this with the following find-replace regex: <code>self\.([\w\d_]+)\.</code> -&gt; <code>self.session.$1.</code></p>
 <p>Change <code>pie/src/context/top_down.rs</code>:</p>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -3940,7 +3940,7 @@ <h2 id="update-topdowncontext"><a class="header" href="#update-topdowncontext">U
 <p>Now we change <code>Session</code> to use <code>TopDownContext</code>. </p>
 <h2 id="update-session"><a class="header" href="#update-session">Update Session</a></h2>
 <p>Change <code>pie/src/lib.rs</code>:</p>
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     let diff = String.raw`--- pie/src/lib.rs
@@ -3973,7 +3973,7 @@ <h2 id="update-session"><a class="header" href="#update-session">Update Session<
 Then, we just create a <code>TopDownContext</code> and call <code>require_initial</code>.</p>
 <p>Finally, we can now make the <code>context</code> module private, as users of the library run builds using <code>Session</code>, instead of having to create a context implementation.
 Change <code>pie/src/lib.rs</code>:</p>
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@@ -4006,7 +4006,7 @@ <h2 id="update-session"><a class="header" href="#update-session">Update Session<
 We need to update the incrementality example to work with these changes.</p>
 <h2 id="update-incremental-example"><a class="header" href="#update-incremental-example">Update incremental example</a></h2>
 <p>First change some imports in <code>pie/examples/incremental.rs</code>:</p>
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 <script>
   document.addEventListener('DOMContentLoaded', function () {
     let diff = String.raw`--- pie/examples/incremental.rs
@@ -4036,7 +4036,7 @@ <h2 id="update-incremental-example"><a class="header" href="#update-incremental-
   });
 </script>
 <p>Then, change <code>pie/examples/incremental.rs</code> to use sessions:</p>
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     let diff = String.raw`--- pie/examples/incremental.rs
@@ -4205,7 +4205,7 @@ <h2 id="update-incremental-example"><a class="header" href="#update-incremental-
 </ol>
 <h2 id="tracker-trait"><a class="header" href="#tracker-trait"><code>Tracker</code> trait</a></h2>
 <p>Add the <code>tracker</code> module to <code>pie/src/lib.rs</code>:</p>
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     let diff = String.raw`--- pie/src/lib.rs
@@ -4311,7 +4311,7 @@ <h2 id="no-op-tracker"><a class="header" href="#no-op-tracker">No-op tracker</a>
 <h2 id="using-the-tracker-trait"><a class="header" href="#using-the-tracker-trait">Using the <code>Tracker</code> trait</a></h2>
 <p>Now we will make the build system generic over <code>Tracker</code>, and insert <code>Tracker</code> calls in context implementations.</p>
 <p>Make <code>Pie</code> and <code>Session</code> generic over <code>Tracker</code> by modifying <code>pie/src/lib.rs</code>:</p>
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 <script>
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     let diff = String.raw`--- pie/src/lib.rs
@@ -4446,7 +4446,7 @@ <h2 id="using-the-tracker-trait"><a class="header" href="#using-the-tracker-trai
 For convenience, <code>Session</code> also provides access to the tracker with <code>tracker</code> and <code>tracker_mut</code>.</p>
 <p>Now we make <code>TopDownContext</code> generic over <code>Tracker</code>, and insert calls to tracker methods.
 Modify <code>pie/src/context/top_down.rs</code>:</p>
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     let diff = String.raw`--- pie/src/context/top_down.rs
@@ -4576,7 +4576,7 @@ <h2 id="implement-writing-tracker"><a class="header" href="#implement-writing-tr
 <p>Now we can implement some interesting trackers.
 We start with a simple <code>WritingTracker</code> that writes build events to some writer.</p>
 <p>Add the <code>writing</code> module to <code>pie/src/tracker/mod.rs</code>:</p>
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 <script>
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     let diff = String.raw`--- pie/src/tracker/mod.rs
@@ -4728,7 +4728,7 @@ <h2 id="implement-writing-tracker"><a class="header" href="#implement-writing-tr
 But in this tutorial, we will keep it simple like this.</p>
 <p>Check that the code compiles with <code>cargo test</code>.</p>
 <p>Let's try out our writing tracker in the incrementality example by modifying <code>pie/examples/incremental.rs</code>:</p>
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 <script>
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     let diff = String.raw`--- pie/examples/incremental.rs
@@ -4814,7 +4814,7 @@ <h2 id="implement-event-tracker"><a class="header" href="#implement-event-tracke
 To check incrementality and soundness, we need to be able to check whether a task has executed or not, and check the order of build events.
 Therefore, we will implement the <code>EventTracker</code> that stores build events for later inspection.</p>
 <p>Add the <code>event</code> module to <code>pie/src/tracker/mod.rs</code>:</p>
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 <script>
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     let diff = String.raw`--- pie/src/tracker/mod.rs
diff --git a/searchindex.js b/searchindex.js
index 766129e..ed11458 100644
--- a/searchindex.js
+++ b/searchindex.js
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construction This page was quickly created to make setup possible, but is unfinished. Make sure Rust is installed . We start by creating a new Rust crate. Create the pie directory and create the pie/Cargo.toml file with the following contents: [package]\nname = \"pie\"\nversion = \"0.1.0\"\nedition = \"2021\" Then create the pie/src directory and create the pie/src/lib.rs file, which will be left empty for now. Run cargo build to test if the project was set up correctly. The output should look something like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.12s Download source code You can download the source files up to this point .","breadcrumbs":"Programmability » Setup » Setup","id":"0","title":"Setup"},"1":{"body":"In this section, we will program the core API of the programmatic incremental build system. The unit of computation in a programmatic build system is a task . A task is kind of like a closure: a value that can be executed to produce their output. However, in an incremental programmatic build system, we also need to keep track of dynamic dependencies that are made while tasks are executing. Therefore, tasks are executed under a build context which enable them to create these dependencies. Tasks require other tasks through the context, creating a dynamic dependency and returning their up-to-date output. On the other hand, an incremental build context wants to selectively execute tasks — only those that are affected by a change. To that end, a build context will selectively execute tasks, tasks require other tasks through the build context, the build context selectively executes those, and so forth. Thus, tasks and build contexts are mutually recursive. Note In this tutorial, we will be using the words context , build context , and build system interchangeably, typically using just context as it is concise. Let's make tasks and contexts more concrete by defining them in code.","breadcrumbs":"Programmability » Programmable Build System API » Programmable Build System API","id":"1","title":"Programmable Build System API"},"10":{"body":"To check whether we need to execute a task, we need to check the dependencies of that task to see if any of them are inconsistent. To make this consistency checking configurable, we will use stamps. A dependency is inconsistent if after stamping, the new stamp is different from the old stamp. Therefore, we will implement a FileStamper that stamps files and produces a FileStamp, and an OutputStamper that stamps task outputs and produces an OutputStamp. Add the stamp module to pie/src/lib.rs: This module is public as users of the library will construct stampers.","breadcrumbs":"Incrementality » Stamps » Stamps","id":"10","title":"Stamps"},"11":{"body":"Create the pie/src/stamp.rs file and add: use std::fmt::Debug;\nuse std::io;\nuse std::path::Path;\nuse std::time::SystemTime; use crate::fs::metadata; #[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\npub enum FileStamper { Exists, Modified,\n} impl FileStamper { pub fn stamp(&self, path: impl AsRef<Path>) -> Result<FileStamp, io::Error> { match self { FileStamper::Exists => { Ok(FileStamp::Exists(path.as_ref().try_exists()?)) } FileStamper::Modified => { let Some(metadata) = metadata(path)? else { return Ok(FileStamp::Modified(None)); }; Ok(FileStamp::Modified(Some(metadata.modified()?))) } } }\n} #[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\npub enum FileStamp { Exists(bool), Modified(Option<SystemTime>),\n} We're implementing FileStamper as an enum for simplicity. A FileStamper has a single method stamp which takes something that can be dereferenced to a path, and produces a FileStamp or an error if creating the stamp failed. For now, we implement only two kinds of file stampers: Exists and Modified. The Exists stamper just returns a boolean indicating whether a file exists. It can be used to create a file dependency where a task behaves differently based on whether a file exists or not. The Modified stamper returns the last modification date if the file exists, or None if the file does not exist. We derive Eq for stamps so that we can compare them. Equal (same) stamps indicate a consistent dependency, unequal (different) indicates inconsistent. We also derive Eq for stampers, because the stamper of a dependency could change, making the dependency inconsistent.","breadcrumbs":"Incrementality » Stamps » File stamps","id":"11","title":"File stamps"},"12":{"body":"We implement task output stampers in a similar way. Add to pie/src/stamp.rs: #[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\npub enum OutputStamper { Inconsequential, Equals,\n} impl OutputStamper { pub fn stamp<O>(&self, output: O) -> OutputStamp<O> { match self { OutputStamper::Inconsequential => OutputStamp::Inconsequential, OutputStamper::Equals => OutputStamp::Equals(output), } }\n} #[derive(Clone, Eq, PartialEq, Debug)]\npub enum OutputStamp<O> { Inconsequential, Equals(O),\n} impl<O> OutputStamp<O> { pub fn as_ref(&self) -> OutputStamp<&O> { match self { OutputStamp::Inconsequential => OutputStamp::Inconsequential, OutputStamp::Equals(o) => OutputStamp::Equals(o), } }\n} The Inconsequential stamper simply ignores the output and always returns the same stamp (thus is always equal). It can be used to create a task dependency where we are interested in some side effect of a task, but don't care about its output. The Equals stamper simply wraps the output of a task, so the stamp is equal when the output is equal. Output stamps are generic over the task output type O. Trait bounds and derive macros Because O is used in the enum, the derive attributes on OutputStamp create bounds over O. Thus, OutputStamp is only Clone when O is Clone, OutputStamp is only Eq when O is Eq, and so forth. Because we declared Task::Output with bound Clone + Eq + Debug, we can be sure that OutputStamp is always Clone, Eq, and Debug. User-defined stamps FileStamper and OutputStamper could also be a trait which would allow users of the library to implement their own stampers. For simplicity, we do not explore that option in this tutorial. If you feel adventurous, you could try to implement this after you've finished the tutorial. Do note that this introduces a lot of extra generics and trait bounds everywhere, which can be a bit cumbersome.","breadcrumbs":"Incrementality » Stamps » Task output stamps","id":"12","title":"Task output stamps"},"13":{"body":"Finally, we write some tests. Add to pie/src/stamp.rs: #[cfg(test)]\nmod test { use std::fs::{remove_file, write}; use std::io; use dev_shared::create_temp_file; use super::*; #[test] fn test_exists_file_stamper() -> Result<(), io::Error> { let stamper = FileStamper::Exists; let temp_file = create_temp_file()?; let stamp = stamper.stamp(&temp_file)?; assert_eq!(stamp, stamper.stamp(&temp_file)?); remove_file(&temp_file)?; assert_ne!(stamp, stamper.stamp(&temp_file)?); Ok(()) } #[test] fn test_modified_file_stamper() -> Result<(), io::Error> { let stamper = FileStamper::Modified; let temp_file = create_temp_file()?; let stamp = stamper.stamp(&temp_file)?; assert_eq!(stamp, stamper.stamp(&temp_file)?); write(&temp_file, format!(\"{:?}\", stamp))?; let new_stamp = stamper.stamp(&temp_file)?; assert_ne!(stamp, new_stamp); let stamp = new_stamp; remove_file(&temp_file)?; assert_ne!(stamp, stamper.stamp(&temp_file)?); Ok(()) } #[test] fn test_inconsequential_output_stamper() { let stamper = OutputStamper::Inconsequential; let stamp = stamper.stamp(&1); assert_eq!(stamp, stamper.stamp(&1)); assert_eq!(stamp, stamper.stamp(&2)); } #[test] fn test_equals_output_stamper() { let stamper = OutputStamper::Equals; let stamp = stamper.stamp(&1); assert_eq!(stamp, stamper.stamp(&1)); assert_ne!(stamp, stamper.stamp(&2)); }\n} We test file stamps by creating a stamp, changing the file, creating a new stamp, and then compare the stamps. We test task output stamps by just passing a different output value to the stamp function, and then compare the stamps. Run cargo test to confirm the stamp implementation. If test test_modified_file_stamper fails, do continue to the next section, because we're going to fix it!","breadcrumbs":"Incrementality » Stamps » Tests","id":"13","title":"Tests"},"14":{"body":"Unfortunately, these tests may fail on some operating systems (Linux and Windows in my testing), due to an imprecise file last modified timer. What can happen is that we write to a file, making the OS update its modified time to 1000 (as an example, not a real timestamp), then very quickly write to the file again, making the OS update its modified time to 1000 again. Then, our test will fail because the stamp didn't change even though we expect it to change. This can happen with an imprecise timer that only increases once every millisecond (again, an example, not a real number) when we perform writes in between that millisecond. Even worse, our test can be flaky, sometimes succeeding if we write in between those milliseconds, sometimes failing if we write within a millisecond. To solve this, add a function to the filesystem testing utility crate. Change dev_shared/src/lib.rs: The write_until_modified function writes to the file, but ensures its modified time will change. Now change the tests in pie/src/stamp.rs to use this function: Now we use write_until_modified to write to the file, ensuring its modified time will change, ensuring the stamp will change when it should. Run cargo test to confirm the stamp implementation, which should succeed now.","breadcrumbs":"Incrementality » Stamps » Testing with file modified time, correctly","id":"14","title":"Testing with file modified time, correctly"},"15":{"body":"We now have a module dedicated to stamps. However, stampers are constructed by users of the library that author tasks, and they need to pass in these stampers when creating dependencies. Therefore, we need to update the Context trait to allow passing in these stampers. Change Context in pie/src/lib.rs: We add the require_file_with_stamper method which allow passing in a stamper. We add a default implementation for require_file that passes in a default stamper. The default is provided by default_require_file_stamper which can be overridden by context implementations. Now apply the same to tasks, changing Context again in pie/src/lib.rs: Update NonIncrementalContext in src/context/non_incremental.rs to implement the new methods: We just ignore the stampers in NonIncrementalContext, as they are only needed for incrementality. Run cargo test to confirm everything still works. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Stamps » Stamps in Context","id":"15","title":"Stamps in Context"},"16":{"body":"Now that we've implemented stamps, we can implement dynamic dependencies and their consistency checking. A dependency is inconsistent if after stamping, the new stamp is different from the old stamp. Therefore, dependencies need to keep track of their stamper and their previous stamp. To that end, we will implement the FileDependency and TaskDependency types with methods for consistency checking. We will also implement a Dependency type that abstracts over FileDependency and TaskDependency, which we will need for the dependency graph implementation in the next chapter. Add the dependency module to pie/src/lib.rs: This module is private, as users of the library should not construct dependencies. They should only create dependencies (and choose stampers) via Context methods.","breadcrumbs":"Incrementality » Dynamic Dependencies » Dynamic Dependencies","id":"16","title":"Dynamic Dependencies"},"17":{"body":"Create the pie/src/dependency.rs file and add: use std::fmt::Debug;\nuse std::fs::File;\nuse std::io;\nuse std::path::PathBuf; use crate::{Context, Task};\nuse crate::fs::open_if_file;\nuse crate::stamp::{FileStamp, FileStamper, OutputStamp, OutputStamper}; #[derive(Clone, Eq, PartialEq, Debug)]\npub struct FileDependency { path: PathBuf, stamper: FileStamper, stamp: FileStamp,\n} impl FileDependency { /// Creates a new file dependency with `path` and `stamper`, returning: /// - `Ok(file_dependency)` normally, /// - `Err(e)` if stamping failed. #[allow(dead_code)] pub fn new(path: impl Into<PathBuf>, stamper: FileStamper) -> Result<Self, io::Error> { let path = path.into(); let stamp = stamper.stamp(&path)?; let dependency = FileDependency { path, stamper, stamp }; Ok(dependency) } /// Creates a new file dependency with `path` and `stamper`, returning: /// - `Ok((file_dependency, Some(file)))` if a file exists at given path, /// - `Ok((file_dependency, None))` if no file exists at given path (but a directory could exist at given path), /// - `Err(e)` if stamping or opening the file failed. pub fn new_with_file(path: impl Into<PathBuf>, stamper: FileStamper) -> Result<(Self, Option<File>), io::Error> { let path = path.into(); let stamp = stamper.stamp(&path)?; let file = open_if_file(&path)?; let dependency = FileDependency { path, stamper, stamp }; Ok((dependency, file)) } /// Returns the path of this dependency. #[allow(dead_code)] pub fn path(&self) -> &PathBuf { &self.path } /// Returns the stamper of this dependency. #[allow(dead_code)] pub fn stamper(&self) -> &FileStamper { &self.stamper } /// Returns the stamp of this dependency. #[allow(dead_code)] pub fn stamp(&self) -> &FileStamp { &self.stamp } /// Checks whether this file dependency is inconsistent, returning: /// - `Ok(Some(stamp))` if this dependency is inconsistent (with `stamp` being the new stamp of the dependency), /// - `Ok(None)` if this dependency is consistent, /// - `Err(e)` if there was an error checking this dependency for consistency. pub fn is_inconsistent(&self) -> Result<Option<FileStamp>, io::Error> { let new_stamp = self.stamper.stamp(&self.path)?; if new_stamp == self.stamp { Ok(None) } else { Ok(Some(new_stamp)) } }\n} A FileDependency stores the path the dependency is about, the stamper used to create a stamp for this dependency, and the stamp that was created at the time the file dependency was made. The FileDependency::new_with_file function also returns the opened file if it exists, so that users of this function can read from the file without having to open it again. We add getter methods to get parts of the file dependency without allowing mutation. Since we will use those getter methods later, we annotate them with #[allow(dead_code)] to disable unused warnings. A file dependency is inconsistent when the stored stamp is not equal to a stamp that we create at the time of checking, implemented in FileDependency::is_inconsistent. For example, if we created a file dependency (with modified stamper) for a file that was modified yesterday, then modify the file, and then call is_inconsistent on the file dependency, it would return Some(new_stamp) indicating that the dependency is inconsistent. We implement an is_inconsistent method here instead of an is_consistent method, so that we can return the changed stamp when the dependency is inconsistent, which we will use for debug logging purposes later. Creating and checking a file dependency can fail due to file operations failing (for example, cannot access the file), so we propagate those errors.","breadcrumbs":"Incrementality » Dynamic Dependencies » File dependencies","id":"17","title":"File dependencies"},"18":{"body":"Task dependencies are implemented in a similar way. Add to pie/src/dependency.rs: #[derive(Clone, Eq, PartialEq, Debug)]\npub struct TaskDependency<T, O> { task: T, stamper: OutputStamper, stamp: OutputStamp<O>,\n} impl<T: Task> TaskDependency<T, T::Output> { /// Creates a new `task` dependency with `stamper` and `output`. pub fn new(task: T, stamper: OutputStamper, output: T::Output) -> Self { let stamp = stamper.stamp(output); Self { task, stamper, stamp } } /// Returns the task of this dependency. #[allow(dead_code)] pub fn task(&self) -> &T { &self.task } /// Returns the stamper of this dependency. #[allow(dead_code)] pub fn stamper(&self) -> &OutputStamper { &self.stamper } /// Returns the stamp of this dependency. #[allow(dead_code)] pub fn stamp(&self) -> &OutputStamp<T::Output> { &self.stamp } /// Checks whether this task dependency is inconsistent, returning: /// - `Some(stamp)` if this dependency is inconsistent (with `stamp` being the new stamp of the dependency), /// - `None` if this dependency is consistent. pub fn is_inconsistent<C: Context<T>>(&self, context: &mut C) -> Option<OutputStamp<T::Output>> { let output = context.require_task(&self.task); let new_stamp = self.stamper.stamp(output); if new_stamp == self.stamp { None } else { Some(new_stamp) } }\n} A TaskDependency stores the task the dependency is about, along with its stamper and stamp that is created when the dependency is created. Task dependencies are generic over the type of tasks T, and their type of outputs O. We also add immutable getters here. Trait bounds on structs We chose not to put a Task trait bound on TaskDependency, and instead put the bound on the impl. There are several up and downsides that should be considered when making such a decision. The main upside for putting the Task bound on the TaskDependency struct, is that we can leave out O and use OutputStamp<T::Output> as the type of the stamp field. This cuts down a generic parameter, which reduces boilerplate. The downside is that we need to then put the Task bound on every struct that uses TaskDependency, which increases boilerplate. In this case, we chose not to put the trait bound on the struct to prevent that trait bound from bubbling up into other structs that use TaskDependency, as it would need to appear in almost every struct in the library. A task dependency is inconsistent if, after recursively checking it, its stamp has changed, implemented in TaskDependency::is_inconsistent. Usually, this will be using the Equals task output stamper, so a task dependency is usually inconsistent when the output of the task changes. Because we need to recursively check the task, TaskDependency::is_inconsistent requires a context to be passed in. Again, there is more mutual recursion here. This recursive consistency checking is one of the core ideas that make programmatic incremental build systems possible. But why is this so important? Why do we need recursive checking? Well, we want our build system to be sound , meaning that we must execute all tasks that are affected by a change. When we do not execute a task that is affected by a change , we are unsound , and introduce an incrementality bug ! Because of dynamic dependencies, a change in a leaf in the dependency tree may affect a task at the root. For example, a compilation task depends on a task that reads a configuration file, which depends on the configuration file. A change to a configuration file (leaf) affects a task that reads the configuration file, which in turn affects the compilation task (root). Therefore, we need to recursively check the dependency tree in order to execute all tasks affected by changes. A different way to think about this, is to think about the invariant of the dependency consistency checking. The invariant is that a dependency is consistent if and only if the subtree of that dependency is consistent, and the dependency itself is consistent. The easiest way to adhere to this invariant, is recursive checking. A final note about recursive checking is that tasks can be executed during it, and executing task can lead to new dynamic dependencies. However, recursive checking handles this without problems because these dependencies are created through the Context, which in turn will call is_inconsistent when needed.","breadcrumbs":"Incrementality » Dynamic Dependencies » Task dependencies","id":"18","title":"Task dependencies"},"19":{"body":"Finally, we create a Dependency enum that abstracts over these two kinds of dependencies. Add to pie/src/dependency.rs: #[derive(Clone, Eq, PartialEq, Debug)]\npub enum Dependency<T, O> { RequireFile(FileDependency), RequireTask(TaskDependency<T, O>),\n} #[derive(Clone, Eq, PartialEq, Debug)]\npub enum InconsistentDependency<O> { File(FileStamp), Task(OutputStamp<O>),\n} impl<T: Task> Dependency<T, T::Output> { /// Checks whether this dependency is inconsistent, returning: /// - `Ok(Some(stamp))` if the dependency is inconsistent (with `stamp` being the new stamp of the dependency), /// - `Ok(None)` if the dependency is consistent, /// - `Err(e)` if there was an error checking the dependency for consistency. pub fn is_inconsistent<C: Context<T>>(&self, context: &mut C) -> Result<Option<InconsistentDependency<T::Output>>, io::Error> { let option = match self { Dependency::RequireFile(d) => d.is_inconsistent()? .map(|s| InconsistentDependency::File(s)), Dependency::RequireTask(d) => d.is_inconsistent(context) .map(|s| InconsistentDependency::Task(s)), }; Ok(option) }\n} Dependency just merges the two kinds of dependencies and provides an is_inconsistent method that calls the corresponding method. We return the changed stamp here as well for debug logging later. We wrap the changed stamp in an InconsistentDependency enum, and map to the correct variant if there is an inconsistency. Because Dependency can store a TaskDependency, we need to propagate the T and O generics. Likewise, InconsistentDependency propagates the O generic for OutputStamp. User-defined dependencies Like with stampers, Dependency could also be a trait to allow users of the library to define their own dependencies. However, as we will see later, these dynamic dependencies also require validation, and I am unsure how such a Dependency trait should look. Therefore, we don't have an appendix on how to implement this. But, if you have an idea on how to this nicely (after you've completed this tutorial), please get in touch!","breadcrumbs":"Incrementality » Dynamic Dependencies » Dependency enum","id":"19","title":"Dependency enum"},"2":{"body":"Since we want users of the build system to implement their own tasks, we will define Task as a trait. Likewise, we will also be implementing multiple contexts in this tutorial, so we will also define Context as a trait. Add the following code to your pie/src/lib.rs file: use std::fmt::Debug;\nuse std::hash::Hash; /// A unit of computation in a programmatic incremental build system.\npub trait Task: Clone + Eq + Hash + Debug { /// Type of output this task returns when executed. type Output: Clone + Eq + Debug; /// Execute the task, using `context` to specify dynamic dependencies, returning `Self::Output`. fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output;\n} /// Programmatic incremental build context, enabling tasks to create dynamic dependencies that context implementations /// use for incremental execution.\npub trait Context<T: Task> { /// Requires given `task`, recording a dependency and selectively executing it. Returns its up-to-date output. fn require_task(&mut self, task: &T) -> T::Output;\n} Note If this seems overwhelming to you, don't worry. We will go through the API and explain things. But more importantly, the API should become more clear once we implement it in the next section and subsequent chapters. Furthermore, if you're new to Rust and/or need help understanding certain concepts, I will try to explain them in Rust Help blocks. They are collapsed by default to reduce distraction, clicking the header opens them. See the first Rust Help block at the end of this section. The Task trait has several supertraits that we will need later in the tutorial to implement incrementality: Eq and Hash: to check whether a task is equal to another one, and to create a hash of it, so we can use a HashMap to get the output of a task if it is up-to-date. Clone: to create a clone of the task so that we can store it in the HashMap without having ownership of it. Debug: to format the task for debugging purposes. A Task has a single method execute, which takes a reference to itself (&self), and a mutable reference to a context (context: &mut C), and produces a value of type Self::Output. Because Context is a trait, we use generics (<C: Context<Self>>) to have execute work for any Context implementation (ignoring the Self part for now). The execute method takes self by reference such that a task can access its data, but not mutate it, as that could throw off incrementality by changing the hash/equality of the task. Finally, the type of output of a task is defined by the Output associated type, and this type must implement Clone, Eq, and Debug for the same reason as Task. The Context trait is generic over Task, allowing it to work with any task implementation. It has a single method require_task for creating a dependency to a task and returning its up-to-date result. It takes a mutable reference to itself, enabling dependency tracking and caching, which require mutation. Because of this, the context reference passed to Task::execute is also mutable. This Task and Context API mirrors the mutually recursive definition of task and context we discussed earlier, and forms the basis for the entire build system. Build the project by running cargo build. The output should look something like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.06s Rust Help The Rust Programming Language is an introductory book about Rust. I will try to provide links to the book where possible. Rust has a module system for project organization. The lib.rs file is the \"main file\" of a library. Later on, we will be creating more modules in different files. Things are imported into the current scope with use statements. We import the Debug and Hash traits from the standard library with two use statements. Use statements use paths to refer to nested things. We use :: for nesting, similar to namespaces in C++. Rust models the concept of ownership to enable memory safety without a garbage collector. The execute method accepts a reference to the current type, indicated with &: &self. This reference is immutable , meaning that we can read data from it, but not mutate it. In Rust, things are immutable by default. On the other hand, execute accepts a mutable reference to the context, indicated with &mut: context: &mut C, which does allow mutation. Traits are the main mechanism for open extensibility in Rust. They are comparable to interfaces in class-oriented languages. We will implement a context and tasks in the next section. Supertraits are a kind of inheritance. The : Clone + Eq + Hash + Debug part of the Task trait means that every Task implementation must also implement the Clone, Eq, Hash, and Debug traits. These traits are part of the standard library: Clone for duplicating values. Eq for equality comparisons, along with PartialEq . Hash for turning a value into a hash. Debug for formatting values in a programmer-facing debugging context. Clone and Eq are so common that they are part of the Rust Prelude , so we don't have to import those with use statements. Methods are functions that take a form of self as the first argument. This enables convenient object-like calling syntax: context.require_task(&task);. Associated types are a kind of placeholder type in a trait such that methods of traits can use that type. In Task this allows us to talk about the Output type of a task. In Context this allows us to refer to both the Task type T and its output type T::Output. The :: syntax here is used to access associated types of traits. The Self type in a trait is a built-in associated type that is a placeholder for the type that is implementing the trait. The Task trait is defined with pub (public) visibility , such that users of the library can implement it. Because Task uses Context in its public API, Context must also be public, even though we don't intend for users to implement their own Context. Download source code You can download the source files up to this point .","breadcrumbs":"Programmability » Programmable Build System API » API Implementation","id":"2","title":"API Implementation"},"20":{"body":"As usual, we write some tests to confirm the behaviour. Add tests to pie/src/dependency.rs: #[cfg(test)]\nmod test { use std::fs::write; use std::io::{self, Read}; use dev_shared::{create_temp_file, write_until_modified}; use crate::context::non_incremental::NonIncrementalContext; use super::*; /// Task that reads file at given path and returns it contents as a string. #[derive(Clone, PartialEq, Eq, Hash, Debug)] struct ReadStringFromFile(PathBuf); impl Task for ReadStringFromFile { type Output = String; fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output { let mut string = String::new(); let file = context.require_file(&self.0).expect(\"failed to require file\"); if let Some(mut file) = file { file.read_to_string(&mut string).expect(\"failed to read from file\"); }; string } } #[test] fn test_file_dependency_consistency() -> Result<(), io::Error> { let mut context = NonIncrementalContext; let temp_file = create_temp_file()?; write(&temp_file, \"test1\")?; let file_dependency = FileDependency::new(temp_file.path(), FileStamper::Modified)?; let dependency: Dependency<ReadStringFromFile, String> = Dependency::RequireFile(file_dependency.clone()); assert!(file_dependency.is_inconsistent()?.is_none()); assert!(dependency.is_inconsistent(&mut context)?.is_none()); // Change the file, changing the stamp the stamper will create next time, making the file dependency inconsistent. write_until_modified(&temp_file, \"test2\")?; assert!(file_dependency.is_inconsistent()?.is_some()); assert!(dependency.is_inconsistent(&mut context)?.is_some()); Ok(()) } #[test] fn test_task_dependency_consistency() -> Result<(), io::Error> { let mut context = NonIncrementalContext; let temp_file = create_temp_file()?; write(&temp_file, \"test1\")?; let task = ReadStringFromFile(temp_file.path().to_path_buf()); let output = context.require_task(&task); let task_dependency = TaskDependency::new(task.clone(), OutputStamper::Equals, output); let dependency = Dependency::RequireTask(task_dependency.clone()); assert!(task_dependency.is_inconsistent(&mut context).is_none()); assert!(dependency.is_inconsistent(&mut context)?.is_none()); // Change the file, causing the task to return a different output, changing the stamp the stamper will create next // time, making the task dependency inconsistent. write_until_modified(&temp_file, \"test2\")?; assert!(task_dependency.is_inconsistent(&mut context).is_some()); assert!(dependency.is_inconsistent(&mut context)?.is_some()); Ok(()) }\n} We test a file dependency by asserting that is_inconsistent returns Some after changing the file. Testing task dependencies requires a bit more work. We create task ReadStringFromFile that reads a string from a file, and then returns that string as output. We require the task to get its output (\"test1\"), and create a task dependency with it. Then, we change the file and check consistency of the task dependency. That recursively requires the task, the context will execute the task, and the task now returns (\"test2\"). Since we use the Equals output stamper, and \"test1\" does not equal \"test2\", the dependency is inconsistent and returns a stamp containing \"test2\". Note that we are both testing the specific dependencies (FileDependency and TaskDependency), and the general Dependency. Note Normally, a task such as ReadStringFromFile shound return a Result<String, io::Error>, but for testing purposes we are just using panics with expect. In the file dependency case, using Dependency requires an explicit type annotation because there is no task to infer the type from. We just use Dependency<ReadStringFromFile, String> as the type, and this is fine even though we don't use ReadStringFromFile in that test, because the Dependency::RequireFile variant does not use those types. Run cargo test to confirm everything still works. You will get some warnings about unused things, but that is ok as we will use them in the next section. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Dynamic Dependencies » Tests","id":"20","title":"Tests"},"21":{"body":"To do incremental building, we need to keep track of all files, tasks, their dependencies, and task outputs, in a dependency graph. This will be the responsibility of the Store data structure. Context implementations will use methods on Store to query and mutate the dependency graph. In other words, Store encapsulates the dependency graph. However, writing a dependency graph data structure is outside of the scope of this tutorial, so we will be using the pie_graph library which we prepared exactly for this use case. The graph from this library is a directed acyclic graph (DAG), meaning that edges are directed and there may be no cycles in edges, as that would prohibit topological orderings. Graph library The pie_graph library is a modified version of the great incremental-topo library which implements incremental topological ordering: it keeps the topological ordering up-to-date incrementally while nodes and edges are added and removed. That is exactly what we need, as dynamic dependencies prevents us from calculating the topological ordering in one go, and calculating the topological ordering after every task execution is prohibitively expensive. The implementation in the incremental-topo library is based on a paper by D. J. Pearce and P. H. J. Kelly that describes several dynamic topological sort algorithms for directed acyclic graphs. Add the pie_graph dependency to pie/Cargo.toml:","breadcrumbs":"Incrementality » Dependency Graph Store » Dependency Graph Store","id":"21","title":"Dependency Graph Store"},"22":{"body":"Add the store module to pie/src/lib.rs: This module is private, as users of the library should not interact with the store. Only Context implementations will use the store. Create the pie/src/store.rs file and add the following to get started: use std::path::{Path, PathBuf}; use pie_graph::{DAG, Node}; use crate::dependency::{Dependency, FileDependency, TaskDependency};\nuse crate::Task; /// Stores files and tasks, and their dependencies, in a DAG (directed acyclic graph). Provides operations to mutate\n/// and query this graph.\npub struct Store<T, O> { graph: DAG<NodeData<T, O>, Dependency<T, O>>,\n} #[derive(Debug)]\nenum NodeData<T, O> { File(PathBuf), Task { task: T, output: Option<O>, },\n} impl<T: Task> Default for Store<T, T::Output> { fn default() -> Self { Self { graph: DAG::default(), } }\n} The Store is generic over tasks T and their outputs O, like we have done before with Dependency. The DAG type from pie_graph represents a DAG with nodes and edges, and data attached to those nodes and edges. The nodes in our graph are either files or tasks, and the edges are dependencies. The first generic argument to DAG is the type of data to attach to nodes, which is NodeData<T, O> in our case. Because nodes can be files or tasks, NodeData<T, O> enumerates these, storing the path for files, and the task along with its output for tasks. We store file paths as PathBuf, which is the owned version of Path (similar to String being the owned version of str). The task output is stored as Option<O> because we can add a task to the graph without having executed it, so we don't have its output yet. The second argument is the type of data to attach to edges, which is Dependency<T, O>, using the Dependency enum we defined earlier. We implement Default for the store to initialize it. Deriving default We cannot derive this Default implementation even though it seems we should be able to, because the derived implementation will require T and O to be Default, and this is not always the case. This is because the Default derive macro is conservative and adds a : Default bound to every generic argument in the Default trait implementation, and there is no way to disable this behaviour. Therefore, we implement Default ourselves. There are several crates that have more configurable derive macros for these things, but adding an extra dependency to generate a few lines of code is not worth the extra compilation time, so we just implement it manually here.","breadcrumbs":"Incrementality » Dependency Graph Store » Store basics","id":"22","title":"Store basics"},"23":{"body":"A node in DAG is represented by a Node, which is a transparent identifier (sometimes called a handle ) that points to the node and its data. We can create nodes in the graph, and then query attached data (NodeData) given a node. So DAG allows us to go from Node to a PathBuf and task T through attached NodeData. However, we want each unique file and task to be represented by a single unique node in the graph. We need this for incrementality so that if the build system encounters the same task twice, we can find the corresponding task node in the graph the second time, check if it is consistent, and return its output if it is. To ensure unique nodes, we need to maintain the reverse mapping from PathBuf and T to Node ourselves, which we will do with HashMaps. This is also the reason for the Eq and Hash trait bounds on the Task trait, so we can use them as keys in HashMaps. Change pie/src/store.rs to add hash maps to map between these things: To prevent accidentally using a file node as a task node, and vice versa, change pie/src/store.rs to add specific types of nodes: The FileNode and TaskNode types are newtypes that wrap a Node into a specific type of node. The Borrow implementations will make subsequent code a bit more concise by automatically converting &FileNode and &TaskNodes to &Nodes. Newtypes Because the Nodes inside the newtypes are not public, it is not possible to construct a FileNode or TaskNode outside of this module. Therefore, if we only accept and create FileNode and TaskNode in the Store API, it is not possible to use the wrong kind of node. The Borrow implementation does leak outside of this module, but not outside of this crate (library). This is because the visibility of a trait implementation is the intersection of the visibilities of the trait and type it is implemented on. Borrow is public, but FileNode and TaskNode are only public within this crate. Thefore, modules of this crate can extract the Node out of FileNode and TaskNode. However, that Node cannot be used to construct a FileNode or TaskNode, so it is not a problem. Now we will add methods create nodes and to query their attached data. Add the following code to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Gets the file node for `path`, or creates a file node by adding it to the dependency graph. pub fn get_or_create_file_node(&mut self, path: impl AsRef<Path>) -> FileNode { let path = path.as_ref(); if let Some(file_node) = self.file_to_node.get(path) { *file_node } else { let node = self.graph.add_node(NodeData::File(path.to_path_buf())); let node = FileNode(node); self.file_to_node.insert(path.to_path_buf(), node); node } } /// Gets the path for `node`. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph. #[allow(dead_code)] pub fn get_file_path(&self, node: &FileNode) -> &PathBuf { let Some(NodeData::File(path)) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; path } /// Gets the task node for `task`, or creates a task node by adding it to the dependency graph. pub fn get_or_create_task_node(&mut self, task: &T) -> TaskNode { if let Some(node) = self.task_to_node.get(task) { *node } else { let node = self.graph.add_node(NodeData::Task { task: task.clone(), output: None, }); let node = TaskNode(node); self.task_to_node.insert(task.clone(), node); node } } /// Gets the task for `node`. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph. pub fn get_task(&self, node: &TaskNode) -> &T { let Some(NodeData::Task { task, .. }) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; task }\n} The get_or_create_file_node method creates file nodes. When we want to go from a file path (using impl AsRef<Path>) to a FileNode, either we have already added this file path to the graph and want to get the FileNode for it, or we have not yet added it to the graph yet and should add it. The former is handled by the if branch in get_or_create_file_node, where we just retrieve the FileNode from the file_to_node hash map. The latter is handled by the else branch where we add the node to the graph with graph.add_node which attaches the NodeData::File data to the node, and then returns a FileNode which we insert into the file_to_node map. The get_file_path method does the inverse. We get the attached data given a node, and extract the file path from it. Note that we are using panic! here to indicate that invalid usage of this method is an unrecoverable programming error that should not occur. Returning an Option<&PathBuf> makes no sense here, as the caller of this method has no way to recover from this. Because this is not an end-user-facing API (store module is private), we control all the calls to this method, and thus we are responsible for using these methods in a valid way. Therefore, when we call these methods, we should document why it is valid (if this is not immediately obvious), and we need to test whether we really use it in a valid way. We're also documenting the panics in a # Panics section in the documentation comment, as is common practice in Rust. Triggering these panics Because only Store can create FileNodes and TaskNodes, and all methods only take these values as inputs, these panics will not happen under normal usage. The only way to trigger these panics (in safe Rust) would be to create two stores, and use the nodes from one store in another. However, since this is a private module, we just need to make sure that we don't do that. There are some tricks to prevent even this kind of invalid usage. For example, the generativity crate generates unique identifiers based on lifetimes. However, that is a bit overkill, especially for an internal API, so we won't be using that. We implement similar methods for task nodes in get_or_create_task_node and get_task.","breadcrumbs":"Incrementality » Dependency Graph Store » Graph nodes","id":"23","title":"Graph nodes"},"24":{"body":"When we do not need to execute a task because it is consistent, we still need to return its output. Therefore, we store the task output in NodeData::Task and add methods to query and manipulate task outputs. Add the following code to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Checks whether task `node` has an output. Returns `false` if `node` does not have an output. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph. pub fn task_has_output(&self, node: &TaskNode) -> bool { let Some(NodeData::Task { output, .. }) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; output.is_some() } /// Gets the output for task `node`. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph, or if the task has no output. pub fn get_task_output(&self, node: &TaskNode) -> &T::Output { let Some(NodeData::Task { output: Some(output), .. }) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph, or does not have an output\", node); }; output } /// Sets the output for task `node` to `new_output`. /// /// # Panics /// /// Panics if task `node` was not found in the dependency graph. pub fn set_task_output(&mut self, node: &TaskNode, new_output: T::Output) { let Some(NodeData::Task { output, .. }) = self.graph.get_node_data_mut(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; output.replace(new_output); }\n} The task_has_output, get_task_output, and set_task_output methods manipulate task outputs in NodeData::Task. Again, we are using panics here to indicate unrecoverable programming errors.","breadcrumbs":"Incrementality » Dependency Graph Store » Task outputs","id":"24","title":"Task outputs"},"25":{"body":"Now we need methods to query and manipulate dependencies. The edges in the graph are dependencies between tasks and files. Tasks can depend on other tasks and files, but there are no dependencies between files. An edge does not have its own dedicated representation, and is simply represented by two nodes: the source node and the destination node of the edge. Add the following code to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Get all dependencies of task `src`. /// /// # Panics /// /// Panics in development builds if `src` was not found in the dependency graph. pub fn get_dependencies_of_task<'a>(&'a self, src: &'a TaskNode) -> impl Iterator<Item=&'a Dependency<T, T::Output>> + 'a { debug_assert!(self.graph.contains_node(src), \"BUG: node {:?} was not found in the dependency graph\", src); self.graph.get_outgoing_edge_data(src) } /// Add a file require `dependency` from task `src` to file `dst`. /// /// # Panics /// /// Panics if `src` or `dst` were not found in the dependency graph, or if a cycle is created by adding this dependency. pub fn add_file_require_dependency(&mut self, src: &TaskNode, dst: &FileNode, dependency: FileDependency) { match self.graph.add_edge(src, dst, Dependency::RequireFile(dependency)) { Err(pie_graph::Error::NodeMissing) => panic!(\"BUG: source node {:?} or destination node {:?} was not found in the dependency graph\", src, dst), Err(pie_graph::Error::CycleDetected) => panic!(\"BUG: cycle detected when adding file dependency from {:?} to {:?}\", src, dst), _ => {}, } } /// Adds a task require `dependency` from task `src` to task `dst`. /// /// # Errors /// /// Returns `Err(())` if adding this dependency to the graph creates a cycle. /// /// # Panics /// /// Panics if `src` or `dst` were not found in the dependency graph. pub fn add_task_require_dependency(&mut self, src: &TaskNode, dst: &TaskNode, dependency: TaskDependency<T, T::Output>) -> Result<(), ()> { match self.graph.add_edge(src, dst, Dependency::RequireTask(dependency)) { Err(pie_graph::Error::NodeMissing) => panic!(\"BUG: source node {:?} or destination node {:?} was not found in the dependency graph\", src, dst), Err(pie_graph::Error::CycleDetected) => Err(()), _ => Ok(()), } }\n} The get_dependencies_of_task method gets the dependencies (edge data of outgoing edges) of a task, and returns it as an iterator (which is empty if task has no dependencies). This method needs explicit lifetime annotations due to the signature of get_outgoing_edge_data and the way we return an iterator using impl Iterator<.... We're using debug_assert! here to trigger a panic indicating an unrecoverable programming error only in development mode, because this check is too expensive to run in release (optimized) mode. The add_file_require_dependency method adds a file dependency. Adding an edge to the graph can result in cycles, which are not allowed in a directed acyclic graph (DAG). Therefore, graph.add_edge can return an Err indicating that there is a cycle. In case of files, this cannot happen because files do not have outgoing dependencies, and the API enforces this by never taking a FileNode as a source (src) of an edge. Tasks can depend on other tasks, so they can create cycles. In add_task_require_dependency, we propagate the cycle detected error (by returning Err(())) to the caller because the caller has more information to create an error message for the user that made a cyclic task dependency.","breadcrumbs":"Incrementality » Dependency Graph Store » Dependencies","id":"25","title":"Dependencies"},"26":{"body":"Finally, when we determine that a task is inconsistent and needs to be executed, we first need to remove its output and remove its outgoing dependencies, as those will interfere with incrementality when not removed. We do NOT want to remove incoming dependencies, as that would remove dependencies from other tasks to this task, which breaks incrementality, so we can't just remove and re-add the task to the graph. Add the reset_task method that does this to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Reset task `src`, removing its output and removing all its outgoing dependencies. /// /// # Panics /// /// Panics if task `src` was not found in the dependency graph. pub fn reset_task(&mut self, src: &TaskNode) { if let Some(NodeData::Task { output, .. }) = self.graph.get_node_data_mut(src) { *output = None; } else { panic!(\"BUG: node {:?} was not found in the dependency graph\", src); } self.graph.remove_outgoing_edges_of_node(src); }\n} This will reset the task output back to None, and remove all outgoing edges (dependencies).","breadcrumbs":"Incrementality » Dependency Graph Store » Resetting tasks","id":"26","title":"Resetting tasks"},"27":{"body":"Now we've implemented everything we need for implementing the top-down context, but first we will write some tests.","breadcrumbs":"Incrementality » Dependency Graph Store » Tests","id":"27","title":"Tests"},"28":{"body":"Add the following code to pie/src/store.rs for testing the file mapping: #[cfg(test)]\nmod test { use crate::Context; use crate::stamp::{FileStamper, OutputStamper}; use super::*; /// Task that returns its owned string. Never executed, just used for testing the store. #[derive(Clone, PartialEq, Eq, Hash, Debug)] struct StringConstant(String); impl StringConstant { pub fn new(string: impl Into<String>) -> Self { Self(string.into()) } } impl Task for StringConstant { type Output = String; fn execute<C: Context<Self>>(&self, _context: &mut C) -> Self::Output { self.0.clone() } } #[test] fn test_file_mapping() { let mut store: Store<StringConstant, String> = Store::default(); let path_a = PathBuf::from(\"hello.txt\"); let node_a = store.get_or_create_file_node(&path_a); assert_eq!(node_a, store.get_or_create_file_node(&path_a)); // Same node assert_eq!(&path_a, store.get_file_path(&node_a)); // Same file path let path_b = PathBuf::from(\"world.txt\"); let node_b = store.get_or_create_file_node(&path_b); assert_eq!(node_b, store.get_or_create_file_node(&path_b)); assert_eq!(&path_b, store.get_file_path(&node_b)); assert_ne!(node_a, node_b); // Different nodes } #[test] #[should_panic] fn test_file_mapping_panics() { let mut fake_store: Store<StringConstant, String> = Store::default(); let fake_node = fake_store.get_or_create_file_node(\"hello.txt\"); let store: Store<StringConstant, String> = Store::default(); store.get_file_path(&fake_node); }\n} We create a simple task StringConstant because we need a Task implementation to test Store, as Store is generic over a Task type. We will never execute it because Store does not execute tasks. Test test_file_mapping checks whether the file node mapping works as expected: get_or_create_file_node calls with the same path should produce the same FileNode. get_or_create_file_node calls with different paths should produce different FileNodes. This works because \"hello.txt\" and \"world.txt\" are different paths, thus their Eq and Hash implementations ensure they get separate spots in the file_to_node hash map. Test test_file_mapping_panics triggers the panic in get_file_path by creating a FileNode with a \"fake store\", and then using that rogue file node in another store. While it is unlikely that we will make this mistake when using Store, it is good to confirm that this panics. Rust help The #[should_panic] attribute makes the test succeed if it panics, and fail if it does not panic.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing file mapping","id":"28","title":"Testing file mapping"},"29":{"body":"Test the task mapping by inserting the following code into the test module (before the last }): #[test] fn test_task_mapping() { let mut store = Store::default(); let task_a = StringConstant::new(\"Hello\"); let node_a = store.get_or_create_task_node(&task_a); assert_eq!(node_a, store.get_or_create_task_node(&task_a)); // Same node assert_eq!(&task_a, store.get_task(&node_a)); // Same task let task_b = StringConstant::new(\"World\"); let node_b = store.get_or_create_task_node(&task_b); assert_eq!(node_b, store.get_or_create_task_node(&task_b)); assert_eq!(&task_b, store.get_task(&node_b)); assert_ne!(node_a, node_b); // Different nodes } #[test] #[should_panic] fn test_task_mapping_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let store: Store<StringConstant, String> = Store::default(); store.get_task(&fake_node); } We test this in the same way as the file mapping. Again, this works because StringConstant(\"Hello\") and StringConstant(\"World\") are different due to their derived Eq and Hash implementations, which make them different due to the strings being different. Likewise, StringConstant::new(\"Hello\") and StringConstant::new(\"Hello\") are equal even if they are created with 2 separate invocations of new. These (in)equalities might seem quite obvious, but it is important to keep in mind because incrementality can only work if we can identify equal tasks at a later time, so that we can check their dependencies and return their cached output when those dependencies are consistent. Later on we will also see that this is important for soundness of the incremental build system.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing task mapping","id":"29","title":"Testing task mapping"},"3":{"body":"We set up the Task and Context API in such a way that we can implement incrementality. However, incrementality is hard , so let's start with an extremely simple non-incremental Context implementation to get a feeling for the API.","breadcrumbs":"Programmability » Non-Incremental Context » Non-Incremental Context","id":"3","title":"Non-Incremental Context"},"30":{"body":"Test task outputs by inserting the following code into the test module: #[test] fn test_task_outputs() { let mut store = Store::default(); let output_a = \"Hello\".to_string(); let task_a = StringConstant::new(&output_a); let node_a = store.get_or_create_task_node(&task_a); let output_b = \"World\".to_string(); let task_b = StringConstant::new(&output_b); let node_b = store.get_or_create_task_node(&task_b); // Assert that tasks have no output by default. assert!(!store.task_has_output(&node_a)); assert!(!store.task_has_output(&node_b)); // Set output for task A, assert that A has that output but B is unchanged. store.set_task_output(&node_a, output_a.clone()); assert!(store.task_has_output(&node_a)); assert_eq!(store.get_task_output(&node_a), &output_a); assert!(!store.task_has_output(&node_b)); // Set output for task B, assert that B has that output but A is unchanged. store.set_task_output(&node_b, output_b.clone()); assert!(store.task_has_output(&node_a)); assert_eq!(store.get_task_output(&node_a), &output_a); assert!(store.task_has_output(&node_b)); assert_eq!(store.get_task_output(&node_b), &output_b); } #[test] #[should_panic] fn test_task_has_output_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let store: Store<StringConstant, String> = Store::default(); store.task_has_output(&fake_node); } #[test] #[should_panic] fn test_get_task_output_panics() { let mut store = Store::default(); let node = store.get_or_create_task_node(&StringConstant::new(\"Hello\")); store.get_task_output(&node); } #[test] #[should_panic] fn test_set_task_output_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let mut store: Store<StringConstant, String> = Store::default(); store.set_task_output(&fake_node, \"Hello\".to_string()); } Test test_task_outputs ensures that: task_has_output only returns true if given task has an output, and that get_task_output returns the output set by set_task_output for given task. Test test_get_task_output_panics triggers a panic when we call get_task_output for a task that has no output, which is an invalid usage of Store that is more likely to happen than the other panics.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing task outputs","id":"30","title":"Testing task outputs"},"31":{"body":"Test dependencies by inserting the following code into the test module: #[test] fn test_dependencies() { let mut store = Store::default(); let output_a = \"Hello\".to_string(); let task_a = StringConstant::new(output_a.clone()); let node_a = store.get_or_create_task_node(&task_a); let output_b = \"World\".to_string(); let task_b = StringConstant::new(output_b.clone()); let node_b = store.get_or_create_task_node(&task_b); let path_c = PathBuf::from(\"hello.txt\"); let node_c = store.get_or_create_file_node(&path_c); assert_eq!(store.get_dependencies_of_task(&node_a).next(), None); assert_eq!(store.get_dependencies_of_task(&node_b).next(), None); // Add file dependency from task A to file C. let file_dependency_a2c = FileDependency::new(&path_c, FileStamper::Exists).unwrap(); store.add_file_require_dependency(&node_a, &node_c, file_dependency_a2c.clone()); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&node_a).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency_a2c.clone()))); assert_eq!(deps_of_a.get(1), None); assert_eq!(store.get_dependencies_of_task(&node_b).next(), None); // Add task dependency from task B to task A. let task_dependency_b2a = TaskDependency::new(task_a.clone(), OutputStamper::Equals, output_a.clone()); let result = store.add_task_require_dependency(&node_b, &node_a, task_dependency_b2a.clone()); assert_eq!(result, Ok(())); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&node_a).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency_a2c.clone()))); assert_eq!(deps_of_a.get(1), None); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&node_b).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireTask(task_dependency_b2a.clone()))); assert_eq!(deps_of_b.get(1), None); // Add file dependency from task B to file C. let file_dependency_b2c = FileDependency::new(&path_c, FileStamper::Exists).unwrap(); store.add_file_require_dependency(&node_b, &node_c, file_dependency_b2c.clone()); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&node_a).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency_a2c.clone()))); assert_eq!(deps_of_a.get(1), None); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&node_b).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireTask(task_dependency_b2a.clone()))); assert_eq!(deps_of_b.get(1), Some(&Dependency::RequireFile(file_dependency_b2c.clone()))); assert_eq!(deps_of_b.get(2), None); // Add task dependency from task A to task B, creating a cycle. let task_dependency_a2b = TaskDependency::new(task_a.clone(), OutputStamper::Equals, output_a.clone()); let result = store.add_task_require_dependency(&node_a, &node_b, task_dependency_a2b); assert_eq!(result, Err(())); // Creates a cycle: error } #[test] #[should_panic] fn test_get_dependencies_of_task_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let store: Store<StringConstant, String> = Store::default(); let _ = store.get_dependencies_of_task(&fake_node); } #[test] #[should_panic] fn test_add_file_require_dependency_panics() { let mut fake_store = Store::default(); let fake_file_node = fake_store.get_or_create_file_node(\"hello.txt\"); let fake_task_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let mut store: Store<StringConstant, String> = Store::default(); let dependency = FileDependency::new(\"hello.txt\", FileStamper::Exists).unwrap(); store.add_file_require_dependency(&fake_task_node, &fake_file_node, dependency); } #[test] #[should_panic] fn test_add_task_require_dependency_panics() { let mut fake_store = Store::default(); let output = \"Hello\".to_string(); let task = StringConstant::new(&output); let fake_task_node = fake_store.get_or_create_task_node(&task); let mut store: Store<StringConstant, String> = Store::default(); let dependency = TaskDependency::new(task, OutputStamper::Equals, output); let _ = store.add_task_require_dependency(&fake_task_node, &fake_task_node, dependency); } The test_dependencies test is a bit more involved because it ensures that: get_dependencies_of_task returns the dependencies of given task. If the task has no dependencies, the iterator is empty. We test if an iterator is empty by getting the first element of the iterator with .next() and assert that it is None. get_dependencies_of_task returns the dependencies of given task in the order in which they were added, which will be important for soundness later. The graph library returns dependencies in insertion order. add_task_require_dependency adds a dependency to the correct task. creating a cycle with add_task_require_dependency results in it returning Err(()). Note that the StringConstant task does not actually create file or task dependencies, but since Store never executes a task, we can pretend that it does in tests.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing dependencies","id":"31","title":"Testing dependencies"},"32":{"body":"Finally, test task reset by inserting the following code into the test module: #[test] fn test_reset() { let mut store = Store::default(); let output_a = \"Hello\".to_string(); let task_a = StringConstant::new(output_a.clone()); let task_a_node = store.get_or_create_task_node(&task_a); let output_b = \"World\".to_string(); let task_b = StringConstant::new(output_b.clone()); let task_b_node = store.get_or_create_task_node(&task_b); let path = PathBuf::from(\"hello.txt\"); let file_node = store.get_or_create_file_node(&path); // Set outputs for task A and B. store.set_task_output(&task_a_node, output_a.clone()); assert!(store.task_has_output(&task_a_node)); assert_eq!(store.get_task_output(&task_a_node), &output_a); store.set_task_output(&task_b_node, output_b.clone()); assert!(store.task_has_output(&task_b_node)); assert_eq!(store.get_task_output(&task_b_node), &output_b); // Add file dependency for task A and B. let file_dependency = FileDependency::new(&path, FileStamper::Exists).unwrap(); store.add_file_require_dependency(&task_a_node, &file_node, file_dependency.clone()); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&task_a_node).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency.clone()))); assert_eq!(deps_of_a.get(1), None); store.add_file_require_dependency(&task_b_node, &file_node, file_dependency.clone()); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&task_b_node).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireFile(file_dependency.clone()))); assert_eq!(deps_of_b.get(1), None); // Reset only task A. store.reset_task(&task_a_node); // Assert that task A is reset. assert!(!store.task_has_output(&task_a_node)); assert_eq!(store.get_dependencies_of_task(&task_a_node).next(), None); // Assert that task B is unchanged. assert!(store.task_has_output(&task_b_node)); assert_eq!(store.get_task_output(&task_b_node), &output_b); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&task_b_node).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireFile(file_dependency.clone()))); assert_eq!(deps_of_b.get(1), None); } #[test] #[should_panic] fn test_reset_task_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let mut store: Store<StringConstant, String> = Store::default(); store.reset_task(&fake_node); } Here, we ensure that a task with an output and dependencies, does not have an output and dependencies after a reset, while leaving another task untouched. Confirm that the store implementation works with cargo test. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Dependency Graph Store » Testing task reset","id":"32","title":"Testing task reset"},"33":{"body":"We've implemented all the prerequisites for incremental top-down building. Now we will create the TopDownContext type which implements the Context trait in an incremental way.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Top-down Context","id":"33","title":"Top-down Context"},"34":{"body":"Add the top_down module to pie/src/context/mod.rs: Create the pie/src/context/top_down.rs file and add the following to get started: use std::fs::File;\nuse std::io;\nuse std::path::Path; use crate::{Context, fs, Task};\nuse crate::dependency::{FileDependency, TaskDependency};\nuse crate::stamp::{FileStamper, OutputStamper};\nuse crate::store::{Store, TaskNode}; pub struct TopDownContext<T, O> { store: Store<T, O>,\n} impl<T: Task> TopDownContext<T, T::Output> { pub fn new() -> Self { Self { store: Store::default(), } }\n} impl<T: Task> Context<T> for TopDownContext<T, T::Output> { fn require_file_with_stamper<P: AsRef<Path>>(&mut self, path: P, stamper: FileStamper) -> Result<Option<File>, io::Error> { todo!() } fn require_task_with_stamper(&mut self, task: &T, stamper: OutputStamper) -> T::Output { todo!() }\n} The TopDownContext type is generic over tasks T and their outputs O, owns a Store, and can be created using new. TopDownContext implements Context, and the main challenge will be implementing the require_file_with_stamper and require_task_with_stamper methods incrementally and correctly .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Top-down context basics","id":"34","title":"Top-down context basics"},"35":{"body":"Tasks such as ReadStringFromFile which we've used in tests before call context.require_file to declare that they depend on a file in the filesystem. For incrementality, we need to add this dependency to the dependency graph. This dependency will go from the current executing task to the file. Therefore, we will need to keep track of the current executing task. Change pie/src/context/mod.rs to add a field for tracking the current executing task, and use it in require_file_with_stamper: We're not setting current_executing_task yet, as that is the responsibility of require_task_with_stamper which we will implement later. In require_file_with_stamper we're now getting the current executing task. If there is no current executing task, which only happens if a user directly calls require_file on a context, we don't make a dependency and just open the file. Now we need to add the file dependency, change pie/src/context/mod.rs to do this: We simply create or get an existing file node, create a file dependency, and add the file require dependency to the graph via store. Errors are propagated to the caller, so they can react accordingly to filesystem operation failures.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Requiring files","id":"35","title":"Requiring files"},"36":{"body":"To implement require_task_with_stamper, we need to check whether we should execute a task. A task should be executed either if it's new (it does not have an output stored yet), or if at least one of its dependencies is inconsistent. If we don't execute it, then it must have an output value and all its dependencies are consistent, so we just return its output value. Change pie/src/context/mod.rs to implement this logic: We first create or get an existing file node. Then, we check whether the task should be executed with should_execute_task which we still need to implement. If that returns true, we reset the task, set the current executing task, actually execute the task, restore the previous executing task, and set the task output. Otherwise, we get the output of the task from the store, which cannot panic because should_execute_task ensures that the task has an output if it returns false. Finally, we return the output. We still need to create a task dependency. Change pie/src/context/mod.rs to add the dependency: If there is no current executing task, which occurs when a user requires the initial task, we skip creating a dependency. Otherwise, we create a dependency and add it to the store. However, creating a task dependency can create cycles, and we need to handle that error. At this point, we need to make a hard decision about the API of our library. require_task_with_stamper returns the task output, with no opportunity to return an error. If we want to propagate this error, we'd need to change the Context::require_task API to return Result<T::Output, CycleError>. However, because tasks call these methods on Context, we'd also need to change Task::execute to return Result<T::Output, CycleError>. That would require all tasks to propagate these cycle errors every time they require another task. Furthermore, some tasks want to return their own kinds of errors, where T::Output will be Result<AnOutput, AnError>. In that case, the concrete return type would be Result<Result<AnOutput, AnError>, CycleError>, which is annoying to deal with. On the other hand, we can panic when a cycle is found, which requires no changes to the API. We do end up in a mostly unrecoverable state, so a panic is a valid option. However, this is not ideal, because it means the build system can panic due to invalid task dependencies created by the user of the system. Panics will (most of the time) stop the program, which can be annoying to deal with. This is a hard trade-off to make. Either we propagate errors which will not end the program but will introduce a lot of boilerplate and annoyance in task implementations. Or we panic which will end the program but introduces no boilerplate. In this tutorial, we will go with panics on cycles, because it results in a much simpler system. Recovering from panics Panics either abort the program (when panics are set to abort in Cargo.toml), or unwind the call stack and then end the program. When panics abort, there is nothing we can do about it. A panic will immediately abort the program. When panics unwind, the call stack is unwound, which still runs all destructors ( Drop ), and this unwinding can be caught. We can catch unwinding panics with catch_unwind , which is a way to recover from panics. This does require that the types used in the closure passed to catch_unwind are unwind safe . This is because panics exit a function early, which can mess up some invariants of your code. For example, a call to set a task output can be skipped when a panic occurs, breaking a code invariant. Therefore, types such as &mut T are not unwind safe by default, because these invariants can break under panics. Note that unwind safety is something different than the general safety guarantees provided by Rust: type-safe, memory-safe, thread-safe. An unwind unsafe type is still type-safe, memory-safe, and thread-safe. Unwind safety can be more easily achieved by using owned types which run destructors when the function call ends, which work under normal circumstances, but also when unwinding panics. In the context of the PIE build system, if we panic on unrecoverable errors, but want to allow catching these panics, we need to think about unwind safety. At any point we panic, we need to think about keeping the system in a valid state. Another way to recover from panics is to run the panicking code on a different thread. If the code panics, it will only end that thread, effectively allowing panic recovery. However, this does require some form of thread-safety, beause you are moving a computation to a different thread. Furthermore, some platforms do not have access to threads, such as WASM, where this approach would not work. A final note is that care must be taken when unwiding panics across foreign function interfaces (FFI) .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Requiring tasks","id":"36","title":"Requiring tasks"},"37":{"body":"The final piece to our puzzle is the should_execute_task implementation. Add the following code to pie/src/context/top_down.rs: The premise of should_execute_task is simple: go over the dependencies of a task until dependency.is_inconsistent is true, at which we return true. If all dependencies are consistent, then return true only if the task has no output. Otherwise, return false. However, there are some complications due to borrowing. Checking if a task dependency is inconsistent requires recursive checking: TaskDependency::is_inconsistent requires a &mut Context to call Context::require_task, which in turn can require this method again. To that end, we pass self to is_inconsistent, because self is an instance of TopDownContext which implements Context. In this method, self is &mut self, a mutable borrow. Therefore, we cannot have any other borrows active while is_inconsistent is being called, because that would violate one of the safety mechanisms of Rust where mutable borrows are exclusive . Getting the task's dependencies from the store requires a borrow, so we cannot hold onto that borrow. We get around that here by cloning the dependencies and collecting them into a Vec. We also document this fact in a comment to explain to readers (us in the future) why we do this cloning, preventing refactorings only to hit that same borrowing issue again. Cloning and collecting does have a performance overhead as we need to clone the dependencies and heap allocate a Vec to store them. For this tutorial, that is fine, but in a real-world application we should minimize cloning if possible and look into reducing heap allocations. Reference counting Cloning a Dependency results in heap allocations, because cloning FileDependency clones a PathBuf which is a heap allocated string (basically a Vec<u8>), and cloning a TaskDependency clones the Task, which may require allocations as well. One way to avoid heap allocations in both kinds of dependencies is to store the PathBuf and Task in a reference-counting pointer Rc . Then, there will only be one heap allocated PathBuf and Task, and cloning just increments the reference count. The upside is that this approach is easy to implement and reduces allocations. The downside is that clones require incrementing the reference count, which is a write operation that does have a tiny bit of overhead. In many cases, this overhead is smaller than cloning data when the data is large enough or requires heap allocations. In our case, it would probably be worth doing this, but benchmarking is required to confirm this. Note that instead of always wrapping tasks in a Rc, task authors could implement Task on Rc<TheirTask> instead. Since Rc implements Clone, any time we task.clone(), we would just increase the reference count instead. When working in a multi-threaded situation, you would use the thread-safe Arc instead. String optimizations A technique for reducing allocations on strings (and string-like types such as PathBuf) is to apply small string optimization , where small strings are stored inline instead of requiring a heap allocation. This only works if the strings are usually small enough to fit inline on the stack (for example, 32 bytes). Another technique for strings is string interning, where equal strings are stored in a central place and then re-used everywhere. This technique is great when we use the same string a lot of times. That may be a good strategy for a build system, where we work with the same file paths over and over. There are several crates implementing these techniques, but I have not used one myself yet, so I cannot recommend one. Avoiding heap allocations from collecting into Vecs Collecting the elements of an iterator into a Vec requires heap allocations as Vec is allocated on the heap. We can avoid or at least reduce the number of heap allocations by re-using the same Vec instead of creating a new one. Instead of collecting, you would store the Vec in the struct, clear it, and then extend it with the iterator. When you clear a Vec, it removes all the elements, but keeps the heap allocated space. Only if you would add more elements than it has space for, another heap allocation would be required, which will happen less and less frequently when you keep reusing the same Vec. The downside is that you are keeping this heap allocated space for as long as you keep reusing the same Vec, which could waste some memory, but usually this is not a big problem. You could of course call vec.shrink_to_fit() after not using it for a while to free up this space. However, we cannot apply this technique here, because if we store the Vec in TopDownContext, we would run into the same borrowing problem again. This technique also requires that you have mutable access to the Vec in order to mutate it. Both of these limitations can be overcome by using a Cell . Cell allows mutation to its inner value in an immutable context. The catch is that you cannot get a reference to its inner value , you can only take the value out, mutate it, and then set it back. Unfortunately, even this technique cannot be fully applied to should_execute_task, because it is called recursively and therefore the Cell will be empty when we try to take the Vec out. If we want to avoid heap allocations from collecting new Vecs in should_execute_task, we would need to come up with a creative solution. But this is outside of the scope of even this extra information block, so we'll just leave it at that. Finally, we need to do something with dependency checking failures. We've ignored the case where dependency.is_inconsistent returns Err. When dependency checking result in an error, we should store the error for the user to investigate, and assume the dependency is inconsistent. Change pie/src/context/mod.rs to store dependency check errors and give users access to it: And then change pie/src/context/mod.rs to store these errors: It took us a while, but now we've implemented an incremental build system with dynamic dependencies 🎉. Let's set up an example to see the fruits of our labour.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Checking tasks","id":"37","title":"Checking tasks"},"38":{"body":"In this example, we will show off incrementality using two tasks: a task that reads a string from a file, and a task that writes a string to a file. The writing task gets the string by requiring another task. Therefore, we will have a read task with a file dependency, and a write task with a task and file dependency. Because we only support one type of task, we will wrap these tasks in an enum.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Incrementality Example","id":"38","title":"Incrementality Example"},"39":{"body":"Create the pie/examples directory, and create the pie/examples/incrementality.rs file with the following contents: #![allow(unused_imports, unused_variables)] use std::fs::{File, read_to_string, remove_file, write};\nuse std::io::{self, Read, Write};\nuse std::path::{Path, PathBuf}; use dev_shared::{create_temp_dir, write_until_modified};\nuse pie::{Context, Task};\nuse pie::context::top_down::TopDownContext;\nuse pie::stamp::FileStamper; /// Enumeration over file pseudo-tasks.\n#[derive(Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\nenum FileTask { ReadStringFromFile(ReadStringFromFile), WriteStringToFile(WriteStringToFile),\n} /// [`Task`] implementation for [`FileTask`], forwarding execute to the execute functions of the pseudo-tasks.\nimpl Task for FileTask { type Output = Result<String, io::ErrorKind>; fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output { match self { FileTask::ReadStringFromFile(t) => t.execute(context), FileTask::WriteStringToFile(t) => t.execute(context).map(|_| String::new()) } }\n} FileTask is the enum over the ReadStringFromFile and WriteStringToFile \"pseudo-tasks\" that we still need to define. We call these types pseudo-tasks, because they behave like tasks, but do not actually implement Task. We implement Task on FileTask instead, which forwards the execute method to the pseudo-tasks. Both tasks can fail due to using filesystem operations, so the output is a Result. We cannot use std::io::Error as the error in the Result, because it does not implement Clone nor Eq, which need to be implemented for task outputs. Therefore, we use std::io::ErrorKind which does implement these traits. On success, we return a String. Because WriteStringToFile will not return a value (i.e., ()) on success, we return an empty string with String::new(). It would be cleaner to define an FileOutput enum that enumerates the possible outputs of file tasks, which would include a variant for WriteStringToFile returning (). But to keep this example simple we don't do that.","breadcrumbs":"Incrementality » Incremental Top-Down Context » FileTask enumeration","id":"39","title":"FileTask enumeration"},"4":{"body":"Since we will be implementing three different contexts in this tutorial, we will separate them in different modules. Create the context module by adding a module to pie/src/lib.rs: This is a diff over pie/src/lib.rs where lines with a green background are additions, lines with a red background are removals, and lines with a grey background are context on where to add/remove lines, similar to diffs on source code hubs like GitHub. Create the pie/src/context directory, and in it, create the pie/src/context/mod.rs file with the following contents: pub mod non_incremental; Both modules are public so that users of our library can access context implementations. Create the pie/src/context/non_incremental.rs file, it will be empty for now. Your project structure should now look like: pie\n├── src\n│ ├── lib.rs\n│ └── context\n│ ├── mod.rs\n│ └── non_incremental.rs\n├── Cargo.toml\n├── Cargo.lock\n└── target Confirm your module structure is correct by building with cargo build. Rust Help Modules are typically separated into different files . Modules are declared with mod context. Then, the contents of a module are defined either by creating a sibling file with the same name: context.rs, or by creating a sibling directory with the same name, with a mod.rs file in it: context/mod.rs. Use the latter if you intend to nest modules, otherwise use the former. Like traits, modules also have visibility .","breadcrumbs":"Programmability » Non-Incremental Context » Context module","id":"4","title":"Context module"},"40":{"body":"Now add ReadStringFromFile to pie/examples/incrementality.rs: /// Pseudo-task that reads a string from a file.\n#[derive(Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\nstruct ReadStringFromFile(PathBuf, FileStamper); impl ReadStringFromFile { fn new(path: impl AsRef<Path>, stamper: FileStamper) -> FileTask { FileTask::ReadStringFromFile(Self(path.as_ref().to_path_buf(), stamper)) } fn execute<C: Context<FileTask>>(&self, context: &mut C) -> Result<String, io::ErrorKind> { println!(\"Reading from {} with {:?} stamper\", self.0.file_name().unwrap().to_string_lossy(), self.1); let file = context.require_file_with_stamper(&self.0, self.1).map_err(|e| e.kind())?; if let Some(mut file) = file { let mut string = String::new(); file.read_to_string(&mut string).map_err(|e| e.kind())?; Ok(string) } else { Err(io::ErrorKind::NotFound) } }\n} We've already defined a task like this before, but now it accepts a FileStamper, prints something when it gets executed, and propagates errors. Add WriteStringToFile to pie/examples/incrementality.rs: /// Pseudo-task that writes a string to a file, where the string is provided by another task. The string provider is /// boxed to prevent a cyclic definition of infinite size, due to this type being used in [`FileTask`].\n#[derive(Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\nstruct WriteStringToFile(Box<FileTask>, PathBuf, FileStamper); impl WriteStringToFile { fn new(string_provider: impl Into<Box<FileTask>>, path: impl Into<PathBuf>, stamper: FileStamper) -> FileTask { FileTask::WriteStringToFile(Self(string_provider.into(), path.into(), stamper)) } fn execute<C: Context<FileTask>>(&self, context: &mut C) -> Result<(), io::ErrorKind> { println!(\"Writing to {} with {:?} stamper\", self.1.file_name().unwrap().to_string_lossy(), self.2); let string = context.require_task(&self.0)?; let mut file = File::create(&self.1).map_err(|e| e.kind())?; file.write_all(string.as_bytes()).map_err(|e| e.kind())?; context.require_file_with_stamper(&self.1, self.2).map_err(|e| e.kind())?; Ok(()) }\n} What is special about this task, is that it takes another task as input! Tasks in a programmatic incremental build system are first-class, meaning that they are just values that can be passed around. This is similar to closures in Rust and other programming languages, which are functions (with some values captured from the environment), but are also values that can be passed around. Tasks can therefore be seen as a form of incremental closures, although they need to be executed under a Context for incrementality, whereas closures are more free-form. WriteStringToFile requires the task to (incrementally) get the string, creating a task dependency. Then it writes that string to a file, and requires that file to create a file dependency. Boxing to prevent cyclic definition We store the task as Box<FileTask> in order to prevent a cyclic definition, which would cause FileTask to have an undetermined size. This is due to several reasons: In Rust, values are stored on the stack by default. To store something on the stack, Rust needs to know its size at compile-time . The size of an enum is the size of the largest variant. The size of a struct is the sum of the size of the fields. If we don't box the task, to calculate the size of WriteStringToFile, we need to calculate the size of FileTask, which would require calculating the size of WriteStringToFile, and so forth. Therefore, we can't calulate the size of WriteStringToFile and FileTask, which is an error. Boxing solves this because Box<FileTask> allocates a FileTask on the heap, and then creates a pointer to it. Therefore, the size of Box<FileTask> is the size of one pointer, breaking the cycle in the size calculations. Note that this explanation simplifies many aspects of Rust's size calculation .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Read/write pseudo-tasks","id":"40","title":"Read/write pseudo-tasks"},"41":{"body":"We've implemented the tasks, now add a main function to pie/examples/incrementality.rs: fn main() -> Result<(), io::Error> { let temp_dir = create_temp_dir()?; let input_file = temp_dir.path().join(\"input.txt\"); write(&input_file, \"Hi\")?; let output_file = temp_dir.path().join(\"output.txt\"); let mut context = TopDownContext::new(); let read_task = ReadStringFromFile::new(&input_file, FileStamper::Modified); let write_task = WriteStringToFile::new(read_task.clone(), &output_file, FileStamper::Modified); println!(\"A) New task: expect `read_task` to execute\"); // `read_task` is new, meaning that we have no cached output for it, thus it must be executed. let output = context.require_task(&read_task)?; assert_eq!(&output, \"Hi\"); Ok(())\n} We create some temporary files, create our tasks, create a context, and require our first task. Run this example with cargo run --example incremental. You should see the println! in ReadStringFromFile appear in your console as the incremental context correctly determines that this task is new (i.e., has no output) and must be executed. It should look something like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 1.38s Running `/pie/target/debug/examples/incremental`\nA) New task: expect `read_task` to execute\nReading from input.txt with Modified stamper Reuse If we require the task again, what should happen? Insert the following code into the main method: println!(\"\\nB) Reuse: expect no execution\"); // `read_task` is not new and its file dependency is still consistent. It is consistent because the modified time of // `input_file` has not changed, thus the modified stamp is equal. let output = context.require_task(&read_task)?; assert_eq!(&output, \"Hi\"); Running with cargo run --example incremental should produce output like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.66s Running `/pie/target/debug/examples/incremental`\nA) New task: expect `read_task` to execute\nReading from input.txt with Modified stamper B) Reuse: expect no execution We don't see the println! from ReadStringFromFile, so it was not executed, so our incremental build system has correctly reused its output! Normally we would write a test to confirm that the task was executed the first time, and that it was not executed the second time. However, this is not trivial. How do we know if the task was executed? We could track it with a global mutable boolean that ReadStringFromFile keeps track of, but this quickly becomes a mess. Therefore, we will look into creating a proper testing infrastructure in the next chapter. For now, we will continue this example with several more interesting cases. The comments in the code explain in more detail why the build system behaves in this way. Inconsistent file dependency Insert into the main method: write_until_modified(&input_file, \"Hello\")?; println!(\"\\nC) Inconsistent file dependency: expect `read_task` to execute\"); // The file dependency of `read_task` is inconsistent due to the changed modified time of `input_file`. let output = context.require_task(&read_task)?; assert_eq!(&output, \"Hello\"); If we change the file (using write_until_modified to ensure that the modified time changes to trigger the Modified file stamper) and require the task, it should execute, because the file dependency of the task is no longer consistent. New write task, reuse read task Insert into the main method: println!(\"\\nD) New task, reuse other: expect only `write_task` to execute\"); // write_task` is new, but `read_task` is not new and its file dependency is still consistent. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello\"); Now we require a new WriteStringToFile task, which requires the ReadStringFromFile task. However, since the read task is still consistent (its file dependency is consistent), we only expect the write task to execute. We also assert that the write task wrote the correct string to the file. Sound incrementality with top-down building Insert into the main method: write_until_modified(&input_file, \"Hello, World!\")?; println!(\"\\nE) Inconsistent file and task dependency: expect both tasks to execute\"); // The file dependency of `read_task` is inconsistent. Then, the task dependency from `write_task` to `read_task` is // inconsistent because `read_task` now returns `\"Hello, World!\"` as output instead of \"Hello\", and thus its equals // output stamp is different. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); We change the input file and expect both read and write tasks to execute. We require the write task, which checks whether it should be executed by consistency checking its dependencies. The write task has a task dependency to the read task, so we check that for consistency. That recurses into requiring the read task, where we again check whether it should be executed. There, we discover that its input file dependency is inconsistent, so we execute the read task, which now returns \"Hello, World!\" instead of \"Hello\". Now we are back to the consistency check for the task dependency from the write task to the read task. The previous output stamp for that task dependency is Equals(\"Hello\"), but the new stamp is Equals(\"Hello, World!\"), so the task dependency is inconsistent! Therefore, we execute the write task, which correctly writes the new string to the output file. This example shows why we need top-down incremental building for sound incrementality. To ensure that the write task writes the up-to-date string to the output file, we first need to check (and possibly execute) the read task, ensuring it returns the up-to-date string. Early cutoff Insert into the main method: write_until_modified(&input_file, \"Hello, World!\")?; // Note: writing same file contents! println!(\"\\nF) Early cutoff: expect only `read_task` to execute\"); // File dependency of `read_task` is inconsistent because the modified time changed, but it returns the same output // `\"Hello, World!\"` because the contents of the file have not actually changed. Then, the task dependency from // `write_task` to `read_task` is consistent because its output did not change, and thus the equality output stamp is // the same. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); This is very similar to the last operation. The subtle difference is that we are writing to the input file, but we write the same contents . This results in a file with a new modified time, but the same contents. We expect the read task to execute, because its file dependency is inconsistent. However, the previous output stamp of the task dependency from write to read is Equals(\"Hello, World!\"), but the new one is also Equals(\"Hello, World!\") because the read task still returns \"Hello, World!\". Therefore, the task dependency is consistent, and we do not execute the write task. We call this early cutoff , because we can cut off building a task early, if we figure out its task dependency is consistent due to having the same output stamp . Early cutoff is possible due to the precise dependency tracking provided by dynamic dependencies. This is one of the pieces that makes this build system incremental: we don't execute the write task because it is not affected by a change. Different stampers If we want the write task to always write to the output file regardless of what the read task returns, we could implement an Always output stamp that is always inconsistent. In general, output (and file) stamps can be used to finetune incrementality, ensuring that tasks are only executed when they are really affected by a change. Regenerate output files Insert into the main method: write_until_modified(&output_file, \"\")?; println!(\"\\nG) Regenerate changed output file: expect only `write_task` to execute\"); // The file dependency of `write_task` to `output_file` is inconsistent. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); write_until_modified(&output_file, \"\")?; remove_file(&output_file)?; println!(\"\\nH) Regenerate deleted output file: expect only `write_task` to execute\"); // Same results when `output_file` is deleted. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); The write task writes to an output file and then creates a file dependency to it. Therefore, if we modify or remove the output file, and require the write task, it will regenerate the output file because the file dependency is inconsistent. Many build systems do not track this dependency to output files, which can result in incrementality bugs due to output files being deleted (for example, due to a git clean). By tracking these output file dependencies, we ensure that the output files are in a consistent state after every build. Don't regenerate ouput files We can omit the file dependency in the write task to not regenerate output files when they are changed or deleted, if desired. However, this is not recommended due to the possibility of (incrementality) bugs. Different tasks Insert into the main method: let input_file_b = temp_dir.path().join(\"input_b.txt\"); write(&input_file_b, \"Test\")?; let read_task_b_modified = ReadStringFromFile::new(&input_file_b, FileStamper::Modified); let read_task_b_exists = ReadStringFromFile::new(&input_file_b, FileStamper::Exists); println!(\"\\nI) Different tasks: expect `read_task_b_modified` and `read_task_b_exists` to execute\"); // Task `read_task`, `read_task_b_modified` and `read_task_b_exists` are different, due to their `Eq` implementation // determining that their paths and stampers are different. Therefore, `read_task_b_modified` and `read_task_b_exists` // are new tasks, and must be executed. let output = context.require_task(&read_task_b_modified)?; assert_eq!(&output, \"Test\"); let output = context.require_task(&read_task_b_exists)?; assert_eq!(&output, \"Test\"); The identity of tasks is determined by their Eq and Hash implementations, which are typically derived to compare and hash all their fields. Therefore, if we create read tasks for different input file input_file_b and different stamper FileStamper::Exists, these read tasks are not equal to the existing read task, and thus are new tasks with a different identity. We require read_task_b_modified and read_task_b_exists, they are new, and are therefore executed. Same file different stampers Insert into the main method: write_until_modified(&input_file_b, \"Test Test\")?; println!(\"\\nJ) Different stampers: expect only `read_task_b_modified` to execute\"); // Both `read_task_b_modified` and `read_task_b_exists` read from the same file, but they use different stampers. // Therefore, `read_task_b_modified` must be executed because the modified time has changed, but `read_task_b_exists` // will not be executed because its file dependency stamper only checks for existence of the file, and the existence // of the file has not changed. // // Note that using an `Exists` stamper for this task does not make a lot of sense, since it will only read the file // on first execute and when it is recreated. But this is just to demonstrate different stampers. let output = context.require_task(&read_task_b_modified)?; assert_eq!(&output, \"Test Test\"); let output = context.require_task(&read_task_b_exists)?; assert_eq!(&output, \"Test\"); Here we write to input_file_b and then require read_task_b_modified and read_task_b_exists. We expect read_task_b_modified to be executed, but read_task_b_exists to be skipped, because its file dependency only checks for the existence of the input file, which has not changed. This shows that tasks can depend on the same file with different stampers, which influences whether the tasks are affected by a file change individually. Of course, using an Exists stamper for ReadStringFromFile does not make a lot of sense, but this is for demonstration purposes only. Running cargo run --example incremental now should produce output like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.78s Running `/pie/target/debug/examples/incremental`\nA) New task: expect `read_task` to execute\nReading from input.txt with Modified stamper B) Reuse: expect no execution C) Inconsistent file dependency: expect `read_task` to execute\nReading from input.txt with Modified stamper D) New task, reuse other: expect only `write_task` to execute\nWriting to output.txt with Modified stamper E) Inconsistent file and task dependency: expect both tasks to execute\nReading from input.txt with Modified stamper\nWriting to output.txt with Modified stamper F) Early cutoff: expect only `read_task` to execute\nReading from input.txt with Modified stamper G) Regenerate changed output file: expect only `write_task` to execute\nWriting to output.txt with Modified stamper H) Regenerate deleted output file: expect only `write_task` to execute\nWriting to output.txt with Modified stamper I) Different tasks: expect `read_task_b_modified` and `read_task_b_exists` to execute\nReading from input_b.txt with Modified stamper\nReading from input_b.txt with Exists stamper J) Different stampers: expect only `read_task_b_modified` to execute\nReading from input_b.txt with Modified stamper Feel free to experiment more with this example (or new example files) before continuing. In the next chapter, we will define minimality and soundness, set up an infrastructure for testing those properties, and fix issues uncovered by testing. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Exploring incrementality","id":"41","title":"Exploring incrementality"},"42":{"body":"So far, the definitions we've used for minimality (incrementality) and soundness (correctness) have been a bit vague. Let's define this more concretely and precisely. An incremental and sound build system executes a task, if and only if, it is new or affected by a change. A task is new if it has not been executed before. When it is not new, a task is affected by a change when any of its dependencies are inconsistent. A file dependency is inconsistent if its file stamp changes. A task dependency is inconsistent if, after recursively checking the task, its output stamp changes. The recursive nature of checking task dependencies ensures that indirect changes can affect tasks and cause them to be correctly executed. By defining minimality and soundness in terms of dependencies, a task author forgetting to create a dependency or not choosing the correct stamper, does not change whether our build system is minimal and sound. PIE works under the assumption that task authors correctly list all dependencies that mark their task as affected by a change when it actually is. Preventing task authoring mistakes It is of course possible to make mistakes when authoring tasks, for example by creating a dependency to the wrong file, or by forgetting to create a file dependency. Unfortunately, there is no easy way to solve this. We will be writing a build event tracking system later, for which we will make an implementation that writes the entire build log to standard output. This build log can help debug mistakes by precisely showing what the build system is doing. A technique to catch file dependency mistakes is by sandboxing the filesystem to only have access to files that have been required. For example, Bazel can perform sandboxing , but it is not fully cross-platform, and still allows reading files from absolute paths. If a cross-platform and bulletproof sandboxing library exists, it could help catch file dependency mistakes in programmatic incremental build systems. Finally, the ultimate technique to catch file dependency mistakes is by automatically creating these dependencies using filesystem tracing, instead of having the task author make them. For example, the Rattle build system uses fsatrace to automatically create file dependencies, freeing task authors from having to think about file dependencies However, filesystem tracing is also not fully cross-platform and bulletproof, so it cannot always be used. Again, if a cross-platform and bulletproof filesystem tracing library exists, it would be extremely useful for programmatic incremental build systems. In this chapter, we will show minimality and soundness by testing. However, before testing, we make minimality and soundness more precise by changing the API to work with sessions , and implement build event tracking that is needed for testing. We will continue as follows: Introduce sessions and change the API to work with sessions: Session type for performing builds in a session, and the Pie type as the entry point that manages sessions. Create infrastructure to track build events for testing and debugging purposes. Create the Tracker trait, and implement a WritingTracker for debugging and EventTracker for testing. Find a soundness hole where multiple tasks write to the same file. Fix it by tracking file write dependencies separately from read dependencies, and catch these mistakes with dynamic verification. Find a soundness hole where a task reads from a file before another task writes to it. Fix it by catching these mistakes with dynamic verification. Find a soundness hole where cyclic task execution can still occur. Fix it by changing how task dependencies are stored. Proving minimality and soundness? While proving minimality and soundness would be a very interesting exercise, I am not at all an expert in formal proofs in proof assistants such as Coq , Agda , etc. If that is something that interests you, do pursue it and get in touch!","breadcrumbs":"Minimality and Soundness » Minimality and Soundness","id":"42","title":"Minimality and Soundness"},"43":{"body":"A task is consistent if its dependencies are consistent, and consistency of file dependencies is based on the filesystem. However, the filesystem can change during a build, meaning that a task can be affected by multiple different changes in one build. For example, after executing a task, it could immediately be affected by a change in a source file again without the build system knowing about it, and that would not be minimal nor sound. Therefore, we will introduce the concept of a session . Builds are only performed in a session, and at most one session may exist at any given time. In one session, each task is checked or executed at most once , meaning that changes made to source files during a session are not guaranteed to be detected . The result is that if a task is deemed inconsistent at the time it is checked, it will be executed, and will not be checked nor executed any more that session. If a task is deemed consistent at the time it is checked, it will not be checked any more that session. This simplifies minimality and soundness, as we do not need to worry about checking tasks multiple times. Furthermore, it is also an optimisation, as requiring the same task many times only results in one check. We will implement the Session type to hold all session data, and the Pie type as an entry point into the build system that manages a session.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Minimality with Sessions","id":"43","title":"Minimality with Sessions"},"44":{"body":"Change the imports in pie/src/lib.rs: Now add the Pie and Session types to pie/src/lib.rs: /// Main entry point into PIE, a sound and incremental programmatic build system.\npub struct Pie<T, O> { store: Store<T, O>,\n} impl<T: Task> Default for Pie<T, T::Output> { fn default() -> Self { Self { store: Store::default() } }\n} impl<T: Task> Pie<T, T::Output> { /// Creates a new build session. Only one session may be active at once, enforced via mutable (exclusive) borrow. pub fn new_session(&mut self) -> Session<T, T::Output> { Session::new(self) } /// Runs `f` inside a new build session. pub fn run_in_session<R>(&mut self, f: impl FnOnce(Session<T, T::Output>) -> R) -> R { let session = self.new_session(); f(session) }\n} /// A session in which builds are executed.\npub struct Session<'p, T, O> { store: &'p mut Store<T, O>, current_executing_task: Option<TaskNode>, dependency_check_errors: Vec<io::Error>,\n} impl<'p, T: Task> Session<'p, T, T::Output> { fn new(pie: &'p mut Pie<T, T::Output>) -> Self { Self { store: &mut pie.store, current_executing_task: None, dependency_check_errors: Vec::default(), } } /// Requires `task`, returning its up-to-date output. pub fn require(&mut self, task: &T) -> T::Output { todo!(\"Create TopDownContext with this session, and require the task\") } /// Gets all errors produced during dependency checks. pub fn dependency_check_errors(&self) -> impl Iterator<Item=&io::Error> { self.dependency_check_errors.iter() }\n} We set up the types such that Pie owns the store, and Session owns all data for a build session that TopDownContext previously owned. We put the store in Pie because we want to keep the dependency graph and task outputs between build sessions, otherwise we cannot be incremental. A Session is created with Pie::new_session, which borrows Pie mutibly, ensuring that there can only be one Session instance (per Pie instance). run_in_session is a convenience method that runs given function inside a new session. Session::require should require the task with the top-down context and return its up-to-date output, which we will implement once we've changed TopDownContext. The dependency check errors can be accessed with Session::dependency_check_errors. Note that Session also has access to Store, because TopDownContext needs access to the store. The store is mutibly borrowed from Pie. Therefore, the Session struct is generic over the 'p lifetime, where the p stands for Pie. We can leave out this lifetime in Pie::new_session, because the compiler infers it from us, but we must be explicit in structs and most impls. Check that the code compiles (but gives warnings) with cargo check. Now we need to modify TopDownContext to work with Session.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » PIE and Session","id":"44","title":"PIE and Session"},"45":{"body":"Change TopDownContext to only contain a mutable reference to Session in pie/src/context/top_down.rs: Here, we use lifetime 's to denote the lifetime of a session, and make TopDownContext generic over it. new now just accepts a mutable reference to the session. The get_dependency_check_errors method can be removed. We add a require_initial convenience method for Session. In the rest of the file, we need to update the impl lines to include the lifetimes, and we need to replace most instances of self with self.session. You could do this with the following find-replace regex: self\\.([\\w\\d_]+)\\. -> self.session.$1. Change pie/src/context/top_down.rs: Now we change Session to use TopDownContext.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Update TopDownContext","id":"45","title":"Update TopDownContext"},"46":{"body":"Change pie/src/lib.rs: We reset the current_executing_task to None, to be sure that we start a build without an executing task. Then, we just create a TopDownContext and call require_initial. Finally, we can now make the context module private, as users of the library run builds using Session, instead of having to create a context implementation. Change pie/src/lib.rs: Check that the code compiles with cargo check --lib. This only checks if the library builds, but not any examples. We need to update the incrementality example to work with these changes.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Update Session","id":"46","title":"Update Session"},"47":{"body":"First change some imports in pie/examples/incremental.rs: Then, change pie/examples/incremental.rs to use sessions: When we only require one task, we replace context.require_task with pie.new_session().require. When we want to require multiple tasks, we use new_session and call session.require multiple times. It is very important to create a new session each time in this example, because a task is only checked/executed once each session. If we use a single session, our changes are never seen, and we just execute each task once, which is not what we want. Therefore, every time we make changes to source files, or expect that changes have been made to source files, we must create a new session. Note In changes I and J, Rust is smart enough to allow creating a new session even though the previous session variable is still active, because it knows that we don't use that previous session anymore. Check that all code works by running cargo test. With this new API in place, and all code adjusted to work with it, we can continue with tracking build events. Download source code You can download the source files up to this point .","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Update incremental example","id":"47","title":"Update incremental example"},"48":{"body":"So far we have had no convenient way to inspect what our build system is doing, apart from println! debugging or attaching a debugger to the program. In this section, we will change that by tracking build events for debugging and integration testing purposes. We will: Create a Tracker trait that receives build events through method calls. The Tracker trait can be implemented in different ways to handle build events in different ways. Implement a NoopTracker that does nothing, removing the tracking overhead. Make the build system generic over Tracker, such that Context implementations call methods on the tracker to create build events. Implement a WritingTracker that writes build events to standard output or standard error, for debugging purposes. Implement an EventTracker that stores build events for later inspection, for integration testing purposes. Implement a CompositeTracker that forwards build events to 2 other trackers, so we can use multiple trackers at the same time.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Tracking Build Events","id":"48","title":"Tracking Build Events"},"49":{"body":"Add the tracker module to pie/src/lib.rs: Then create the pie/src/tracker directory, create the pie/src/tracker/mod.rs file, and add the following content: use std::path::Path; use crate::stamp::{FileStamp, FileStamper, OutputStamp, OutputStamper};\nuse crate::Task; /// Trait for tracking build events. Can be used to implement logging, event tracing, progress tracking, metrics, etc.\n#[allow(unused_variables)]\npub trait Tracker<T: Task> { /// Start a new build. fn build_start(&mut self) {} /// A build has been completed. fn build_end(&mut self) {} /// A file at `path` has been required, using `stamper` to create `stamp`. fn required_file(&mut self, path: &Path, stamper: &FileStamper, stamp: &FileStamp) {} /// Require `task` using `stamper`. fn require_task(&mut self, task: &T, stamper: &OutputStamper) {} /// A `task` has been required, resulting in consistent `output`, using `stamper` to create `stamp`, and task /// `was_executed`. fn required_task(&mut self, task: &T, output: &T::Output, stamper: &OutputStamper, stamp: &OutputStamp<T::Output>, was_executed: bool) {} /// Execute `task`. fn execute(&mut self, task: &T) {} /// A `task` has been executed, producing `output`. fn executed(&mut self, task: &T, output: &T::Output) {}\n} The Tracker trait is generic over Task. Note Here, we chose to put the Task constraint on the trait itself. This will not lead to cascading constraints, as the Tracker trait will only be used as a constraint in impls, not in structs or other traits. Tracker has methods corresponding to events that happen during a build, such as a build starting or ending, requiring a file, requiring a task, and executing a task. These methods accept &mut self so that tracker implementations can perform mutation, such as storing a build event. We provide default methods that do nothing so that implementors of Tracker only have to override the methods for events they are interested in. We use #[allow(unused_variables)] on the trait to not give warnings for unused variables, as all variables are unused due to the empty default implementations. Default methods Adding a method to Tracker with a default implementation ensures that implementations of Tracker do not have to be changed to work with the new method. This is both good and bad. Good because we can add methods without breaking compatibility. Bad because we can forget to handle a new method, which can lead to problems with for example a composite tracker that forwards events to 2 trackers. In this tutorial we chose the convenient option, but be sure to think about these kind of tradeoffs yourself! Check that the code compiles with cargo test.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Tracker trait","id":"49","title":"Tracker trait"},"5":{"body":"Implement the non-incremental context in pie/src/context/non_incremental.rs by adding: use crate::{Context, Task}; pub struct NonIncrementalContext; impl<T: Task> Context<T> for NonIncrementalContext { fn require_task(&mut self, task: &T) -> T::Output { task.execute(self) }\n} This NonIncrementalContext is extremely simple: in require_task we unconditionally execute the task, and pass self along so the task we're calling can require additional tasks. Let's write some tests to see if this does what we expect. Rust Help In Rust, libraries are called crates . We import the Context and Task traits from the root of your crate (i.e., the src/lib.rs file) using crate:: as a prefix. Structs are concrete types that can contain data through fields and implement traits, similar to classes in class-oriented languages. Since we don't need any data in NonIncrementalContext, we define it as a unit-like struct . Traits are implemented for a type with impl Context for NonIncrementalContext { ... }, where we then have to implement all methods and associated types of the trait. The Context trait is generic over Task, so in the impl block we introduce a type parameter T with impl<T>, and use trait bounds as impl<T: Task> to declare that T must implement Task. The last expression of a function – in this case task.execute(self) in require_task which is an expression because it does not end with ; – is used as the return value. We could also write that as return task.execute(self);, but that is more verbose.","breadcrumbs":"Programmability » Non-Incremental Context » Implementation","id":"5","title":"Implementation"},"50":{"body":"Add a no-op tracker, which is a tracker that does nothing, by adding the following code to pie/src/tracker/mod.rs: /// [`Tracker`] that does nothing.\n#[derive(Copy, Clone, Debug)]\npub struct NoopTracker;\nimpl<T: Task> Tracker<T> for NoopTracker {} Due to the default methods that do nothing on Tracker, this implementation is extremely simple. Removing tracker overhead We will use generics to select which tracker implementation to use. Therefore, all calls to trackers are statically dispatched, and could be inlined. Because NoopTracker only has empty methods, and those empty methods can be inlined, using NoopTracker will effectively remove all tracking code from your binary, thus removing the overhead of tracking if you don't want it. In this tutorial, we do not annotate methods with #[inline] , meaning that the Rust compiler (and the LLVM backend) will make its own decisions on what to make inlineable and what not. If you care about performance here, be sure to annotate those default empty methods with #[inline].","breadcrumbs":"Minimality and Soundness » Tracking Build Events » No-op tracker","id":"50","title":"No-op tracker"},"51":{"body":"Now we will make the build system generic over Tracker, and insert Tracker calls in context implementations. Make Pie and Session generic over Tracker by modifying pie/src/lib.rs: We use A as the generic argument for tracker types in the source code. The Pie struct owns the tracker, similarly to how it owns the store. Pie can be created with a specific tracker with with_tracker, and provides access to the tracker with tracker and tracker_mut. Default type We assign NoopTracker as the default type for trackers in Pie, so that no tracking is performed when we use the Pie type without an explicit tracker type. The Default implementation only works with NoopTracker, because we impl Default for Pie<T, T::Output>, which is equivalent to impl Default for Pie<T, T::Output, NoopTracker> due to the default type. We make Session generic over trackers, and mutibly borrow the tracker from Pie, again like we do with the store. For convenience, Session also provides access to the tracker with tracker and tracker_mut. Now we make TopDownContext generic over Tracker, and insert calls to tracker methods. Modify pie/src/context/top_down.rs: We make TopDownContext generic over trackers, and call methods on the tracker: build_start/build_end in require_initial to track build start and ends, required_file in require_file_with_stamper to track file dependencies, require_task/required_task in require_file_with_stamper to track task dependencies, execute/executed in require_task_with_stamper to track task execution start and ends. In require_file_with_stamper, we also extract should_execute into a variable, and pull dependency out of the if, so that we can pass the required data to tracker.required_task. Check that the code compiles with cargo test. Existing code should keep working due to the NoopTracker default type in Pie. We won't modify NonIncrementalContext to use a tracker, as NonIncrementalContext has no state, so we cannot pass a tracker to it.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Using the Tracker trait","id":"51","title":"Using the Tracker trait"},"52":{"body":"Now we can implement some interesting trackers. We start with a simple WritingTracker that writes build events to some writer. Add the writing module to pie/src/tracker/mod.rs: Then create the pie/src/tracker/writing.rs file and add: use std::io::{self, BufWriter, Stderr, Stdout, Write}; use crate::stamp::{OutputStamp, OutputStamper};\nuse crate::Task;\nuse crate::tracker::Tracker; /// [`Tracker`] that writes events to a [`Write`] instance, for example [`Stdout`].\n#[derive(Clone, Debug)]\npub struct WritingTracker<W> { writer: W, indentation: u32,\n} impl WritingTracker<BufWriter<Stdout>> { /// Creates a [`WritingTracker`] that writes to buffered standard output. pub fn with_stdout() -> Self { Self::new(BufWriter::new(io::stdout())) }\n}\nimpl WritingTracker<BufWriter<Stderr>> { /// Creates a [`WritingTracker`] that writes to buffered standard error. pub fn with_stderr() -> Self { Self::new(BufWriter::new(io::stderr())) }\n}\nimpl<W: Write> WritingTracker<W> { /// Creates a [`WritingTracker`] that writes to `writer`. pub fn new(writer: W) -> Self { Self { writer, indentation: 0, } }\n} The WritingTracker is generic over a writer W that must implement Write, which is a standard trait for writing bytes to something. with_stdout and with_stderr can be used to create buffered writers to standard output and standard error. new can be used to create a writer to anything that implements Write, such as a File. Add the Tracker implementation to pie/src/tracker/writing.rs: impl<W: Write, T: Task> Tracker<T> for WritingTracker<W> { fn required_task(&mut self, task: &T, _output: &T::Output, _stamper: &OutputStamper, _stamp: &OutputStamp<T::Output>, was_executed: bool) { if !was_executed { self.writeln(format_args!(\"✓ {:?}\", task)); self.flush(); } } fn execute(&mut self, task: &T) { self.writeln(format_args!(\"→ {:?}\", task)); self.indent(); self.flush(); } fn executed(&mut self, _task: &T, output: &T::Output) { self.unindent(); self.writeln(format_args!(\"← {:?}\", output)); self.flush(); }\n} #[allow(dead_code)]\nimpl<W: Write> WritingTracker<W> { fn writeln(&mut self, args: std::fmt::Arguments) { self.write_indentation(); writeln!(&mut self.writer, \"{}\", args).ok(); } fn write(&mut self, args: std::fmt::Arguments) { write!(&mut self.writer, \"{}\", args).ok(); } fn write_nl(&mut self) { write!(&mut self.writer, \"\\n\").ok(); } fn indent(&mut self) { self.indentation = self.indentation.saturating_add(1); } fn unindent(&mut self) { self.indentation = self.indentation.saturating_sub(1); } fn write_indentation(&mut self) { for _ in 0..self.indentation { write!(&mut self.writer, \" \").ok(); } } fn flush(&mut self) { self.writer.flush().ok(); }\n} We implement 3 tracker methods that write when: ✓: a task is required but was not executed (i.e., consistent), →: a task starts to execute, ←: when the task is done executing. The text to write is formatted with format_args!, which is passed into writeln using std::fmt::Arguments for flexibility. We flush the writer after every event to ensure that bytes are written out. When a task starts to execute, we increase indentation to signify the recursive checking/execution. When a task is done executing, we decrease the indentation again. Saturating arithmetic We use saturating_add and saturating_sub for safety, which are saturating arithmetic operations that saturate at the numeric bounds instead of overflowing. For example, 0u32.saturating_sub(1) will result in 0 instead of overflowing into 4294967295. These saturating operations are not really needed when calls to indent and unindent are balanced. However, if we make a mistake, it is better to write no indentation than to write 4294967295 spaces of indentation. Alternatively, we could use standard arithmetic operations, which panic on overflow in debug/development mode, but silently overflow in release mode. Failing writes Writes can fail, but we silently ignore them in this tutorial (with let _ = ...) for simplicity. You could panic when writing fails, but panicking when writing to standard output fails is probably going a bit too far. You could store the latest write error and give access to it, which at least allows users of WritingTracker check for some errors. In general, tracking events can fail, but the current Tracker API does not allow for propagating these errors with Result. This in turn because TopDownContext does not return Result for require_task due to the trade-offs discussed in the section on TopDownContext. If you want, you can capture more build events and write them, and/or provide more configuration as to what build events should be written. But in this tutorial, we will keep it simple like this. Check that the code compiles with cargo test. Let's try out our writing tracker in the incrementality example by modifying pie/examples/incremental.rs: We remove the println! statements from tasks and create Pie with WritingTracker. Now run the example with cargo run --example incremental, and you should see the writing tracker print consistent tasks and task executions to standard output.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Implement writing tracker","id":"52","title":"Implement writing tracker"},"53":{"body":"The writing tracker is great for debugging purposes, but we cannot use it to check whether our build system is incremental and sound. To check incrementality and soundness, we need to be able to check whether a task has executed or not, and check the order of build events. Therefore, we will implement the EventTracker that stores build events for later inspection. Add the event module to pie/src/tracker/mod.rs: Then create the pie/src/tracker/event.rs file and add: use std::path::{Path, PathBuf}; use crate::stamp::{FileStamp, FileStamper, OutputStamp, OutputStamper};\nuse crate::Task;\nuse crate::tracker::Tracker; /// [`Tracker`] that stores [events](Event) in a [`Vec`], useful in testing to assert that a context implementation is /// incremental and sound.\n#[derive(Clone, Debug)]\npub struct EventTracker<T: Task> { events: Vec<Event<T>>,\n} impl<T: Task> Default for EventTracker<T> { fn default() -> Self { Self { events: Vec::new() } }\n} /// Enumeration of important build events.\n#[derive(Debug, Clone)]\npub enum Event<T: Task> { /// A file at `path` has been required, using `stamper` to create `stamp`. RequiredFile { path: PathBuf, stamper: FileStamper, stamp: FileStamp }, /// Require `task` using `stamper`. RequireTask { task: T, stamper: OutputStamper }, /// A `task` has been required, resulting in consistent `output`, using `stamper` to create `stamp`, and task /// `was_executed`. RequiredTask { task: T, output: T::Output, stamper: OutputStamper, stamp: OutputStamp<T::Output>, was_executed: bool }, /// Execute `task`. Execute { task: T }, /// A `task` has been executed, producing `output`. Executed { task: T, output: T::Output },\n} The EventTracker stores build events in a Vec. The Event enumeration mimics the Tracker methods, but has all arguments in owned form (for example task: T instead of task: &T) as we want to store these events. Add the tracker implementation to pie/src/tracker/event.rs: impl<T: Task> Tracker<T> for EventTracker<T> { fn build_start(&mut self) { self.events.clear(); } fn required_file(&mut self, path: &Path, stamper: &FileStamper, stamp: &FileStamp) { self.events.push(Event::RequiredFile { path: path.to_path_buf(), stamper: *stamper, stamp: *stamp }); } fn require_task(&mut self, task: &T, stamper: &OutputStamper) { self.events.push(Event::RequireTask { task: task.clone(), stamper: stamper.clone() }); } fn required_task(&mut self, task: &T, output: &T::Output, stamper: &OutputStamper, stamp: &OutputStamp<T::Output>, was_executed: bool) { self.events.push(Event::RequiredTask { task: task.clone(), output: output.clone(), stamper: *stamper, stamp: stamp.clone(), was_executed }); } fn execute(&mut self, task: &T) { self.events.push(Event::Execute { task: task.clone() }); } fn executed(&mut self, task: &T, output: &T::Output) { self.events.push(Event::Executed { task: task.clone(), output: output.clone() }); }\n} We implement the relevant methods from Tracker and store the build events as Event instances in self.events. When a new build starts, we clear the events. Now we will add code to inspect the build events. This is quite a bit of code that we will be using in integration testing to test incrementality and soundness. We'll add in one go to keep the tutorial going, and we will use this code in the next section, but feel free to take some time to inspect the code. Add the following code to pie/src/tracker/event.rs: impl<T: Task> EventTracker<T> { /// Returns a slice over all events. pub fn slice(&self) -> &[Event<T>] { &self.events } /// Returns an iterator over all events. pub fn iter(&self) -> impl Iterator<Item=&Event<T>> { self.events.iter() } /// Returns `true` if `predicate` returns `true` for any event. pub fn any(&self, predicate: impl FnMut(&Event<T>) -> bool) -> bool { self.iter().any(predicate) } /// Returns the number of times `predicate` returns `true`. pub fn count(&self, predicate: impl FnMut(&&Event<T>) -> bool) -> usize { self.iter().filter(predicate).count() } /// Returns `true` if `predicate` returns `true` for exactly one event. pub fn one(&self, predicate: impl FnMut(&&Event<T>) -> bool) -> bool { self.count(predicate) == 1 } /// Returns `Some(index)` for the first event `e` where `predicate(e)` returns `true`, or `None` otherwise. pub fn index_of(&self, predicate: impl FnMut(&Event<T>) -> bool) -> Option<usize> { self.iter().position(predicate) } /// Returns `Some(v)` for the first event `e` where `f(e)` returns `Some(v)`, or `None` otherwise. pub fn find_map<R>(&self, f: impl FnMut(&Event<T>) -> Option<&R>) -> Option<&R> { self.iter().find_map(f) } /// Returns `Some((index, v))` for the first event `e` where `f(e)` returns `Some(v)`, or `None` otherwise. pub fn index_find_map<R>(&self, mut f: impl FnMut(&Event<T>) -> Option<&R>) -> Option<(usize, &R)> { self.iter().enumerate().find_map(|(i, e)| f(e).map(|o| (i, o))) } /// Finds the first [required file event](Event::RequiredFile) for `path` and returns its stamp as `Some(stamp)`, or /// `None` if no event was found. pub fn stamp_of_first_required_file(&self, path: &PathBuf) -> Option<&FileStamp> { self.find_map(|e| e.stamp_of_required_file(path)) } /// Returns `true` if any task was executed. pub fn any_execution(&self) -> bool { self.any(|e| e.is_execution()) } /// Returns `true` if `task` was executed. pub fn any_execution_of(&self, task: &T) -> bool { self.any(|e| e.is_execution_of(task)) } /// Returns `true` if `task` was executed exactly once. pub fn one_execute_of(&self, task: &T) -> bool { self.one(|e| e.is_execute(task)) } /// Finds the first [task execute event](Event::Execute) for `task` and returns its index as `Some(index)`, or `None` /// if no event was found. pub fn index_of_first_execute(&self, task: &T) -> Option<usize> { self.index_of(|e| e.is_execute(task)) } /// Finds the first [task executed event](Event::Executed) for `task` and returns its index as `Some(index)`, or /// `None` if no event was found. pub fn index_of_first_executed(&self, task: &T) -> Option<usize> { self.index_of(|e| e.output_of_executed(task).is_some()) } /// Finds the first [task executed event](Event::Executed) for `task` and returns its index and output as /// `Some((index, output))`, or `None` if no event was found. pub fn index_output_of_first_executed(&self, task: &T) -> Option<(usize, &T::Output)> { self.index_find_map(|e| e.output_of_executed(task)) }\n} impl<T: Task> Event<T> { /// Returns `Some(stamp)` if this is a [required file event](Event::RequiredFile) for file at `path`, or `None` /// otherwise. pub fn stamp_of_required_file(&self, path: &PathBuf) -> Option<&FileStamp> { match self { Event::RequiredFile { path: p, stamp, .. } if p == path => Some(stamp), _ => None, } } /// Returns `true` if this is a task execution (execute or executed) event. pub fn is_execution(&self) -> bool { match self { Event::Execute { .. } => true, Event::Executed { .. } => true, _ => false, } } /// Returns `true` if this is an execution (execute or executed) event for `task`. pub fn is_execution_of(&self, task: &T) -> bool { match self { Event::Execute { task: t } if t == task => true, Event::Executed { task: t, .. } if t == task => true, _ => false, } } /// Returns `true` if this is a [task execute event](Event::Execute) for `task`. pub fn is_execute(&self, task: &T) -> bool { match self { Event::Execute { task: t } if t == task => true, _ => false, } } /// Returns `Some(output)` if this is a [task executed event](Event::Executed) for `task`, or `None` otherwise. pub fn output_of_executed(&self, task: &T) -> Option<&T::Output> { match self { Event::Executed { task: t, output: o } if t == task => Some(o), _ => None, } }\n} We add several general inspection methods to EventTracker: slice and iter provide raw access to all stored Events, any, count, and one are for checking predicates over all events, index_of for finding the index of the first event given a predicate, find_map and index_find_map for finding the first event given some function, returning the output (and also index in index_find_map) of that function. We add methods for specific kinds of events, following the general methods. Finally, we add convenience methods to Event for checking specific kinds of events. Check that the code compiles with cargo test.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Implement event tracker","id":"53","title":"Implement event tracker"},"54":{"body":"Currently, we cannot use both EventTracker and WritingTracker at the same time. We want this so that we can check incrementality and soundness, but also look at standard output for debugging, at the same time. Therefore, we will implement a CompositeTracker that forwards build events to 2 trackers. Add the following code to pie/src/tracker/mod.rs: /// [`Tracker`] that forwards build events to 2 trackers.\n#[derive(Copy, Clone, Debug)]\npub struct CompositeTracker<A1, A2>(pub A1, pub A2);\nimpl<T: Task, A1: Tracker<T>, A2: Tracker<T>> Tracker<T> for CompositeTracker<A1, A2> { fn build_start(&mut self) { self.0.build_start(); self.1.build_start(); } fn build_end(&mut self) { self.0.build_end(); self.1.build_end(); } fn required_file(&mut self, path: &Path, stamper: &FileStamper, stamp: &FileStamp) { self.0.required_file(path, stamper, stamp); self.1.required_file(path, stamper, stamp); } fn require_task(&mut self, task: &T, stamper: &OutputStamper) { self.0.require_task(task, stamper); self.1.require_task(task, stamper); } fn required_task(&mut self, task: &T, output: &T::Output, stamper: &OutputStamper, stamp: &OutputStamp<T::Output>, was_executed: bool) { self.0.required_task(task, output, stamper, stamp, was_executed); self.1.required_task(task, output, stamper, stamp, was_executed); } fn execute(&mut self, task: &T) { self.0.execute(task); self.1.execute(task); } fn executed(&mut self, task: &T, output: &T::Output) { self.0.executed(task, output); self.1.executed(task, output); }\n} CompositeTracker is a tuple struct containing 2 trackers that implements all tracker methods and forwards them to the 2 contained trackers. Its tuple fields are pub so it can be constructed with CompositeTracker(t1, t2) and the contained trackers can be accessed with c.0 and c.1. Check that the code compiles with cargo test. Now that the build event tracking infrastructure is in place, we can start integration testing! Download source code You can download the source files up to this point .","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Implement composite tracker","id":"54","title":"Implement composite tracker"},"6":{"body":"Add the following test to pie/src/context/non_incremental.rs: #[cfg(test)]\nmod test { use super::*; #[test] fn test_require_task_direct() { #[derive(Clone, PartialEq, Eq, Hash, Debug)] struct ReturnHelloWorld; impl Task for ReturnHelloWorld { type Output = String; fn execute<C: Context<Self>>(&self, _context: &mut C) -> Self::Output { \"Hello World!\".to_string() } } let mut context = NonIncrementalContext; assert_eq!(\"Hello World!\", context.require_task(&ReturnHelloWorld)); }\n} In this test, we create a struct ReturnHelloWorld which is the \"hello world\" of the build system. We implement Task for it, set its Output associated type to be String, and implement the execute method to just return \"Hello World!\". We derive the Clone, Eq, Hash, and Debug traits for ReturnHelloWorld as they are required for all Task implementations. We require the task with our context by creating a NonIncrementalContext, calling its require_task method, passing in a reference to the task. It returns the output of the task, which we test with assert_eq!. Run the test by running cargo test. The output should look something like: Compiling pie v0.1.0 (/pie) Finished test [unoptimized + debuginfo] target(s) in 0.44s Running unittests src/lib.rs (/pie/target/debug/deps/pie-6c9d55a7ef727e00) running 1 test\ntest context::non_incremental::test::test_require_task_direct ... ok test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Doc-tests pie running 0 tests test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Which indicates that the test indeed succeeds! You can experiment by returning a different string from ReturnHelloWorld::execute to see what a failed test looks like. Rust Help Unit tests for a module are typically defined by creating a nested module named test with the #[cfg(test)] attribute applied to it. In that test module, you apply #[test] to testing functions, which then get executed when you run cargo test. The #[cfg(...)] attribute provides conditional compilation for the item it is applied to. In this case, #[cfg(test)] ensures that the module is only compiled when we run cargo test. We import all definitions from the parent module (i.e., the non_incremental module) into the test module with use super::*;. In Rust, items — that is, functions, structs, implementations, etc. — can be nested inside functions. We use that in test_require_task_direct to scope ReturnHelloWorld and its implementation to the test function, so it can't clash with other test functions. In execute, we use _context as the parameter name for the context, as the parameter is unused. Unused parameters give a warning in Rust, unless it is prefixed by a _. assert_eq! is a macro that checks if its two expressions are equal. If not, it panics . This macro is typically used in tests for assertions, as a panic marks a test as failed.","breadcrumbs":"Programmability » Non-Incremental Context » Simple Test","id":"6","title":"Simple Test"},"7":{"body":"Our first test only tests a single task that does not use the context, so let's write a test with two tasks where one requires the other to increase our test coverage. Add the following test: We use the same ReturnHelloWorld task as before, but now also have a ToLowerCase task which requires ReturnHelloWorld and then turn its string lowercase. However, due to the way we've set up the types between Task and Context, we will run into a problem. Running cargo test, you should get these errors: Compiling pie v0.1.0 (/pie)\nerror[E0308]: mismatched types --> src/context/non_incremental.rs:46:30 |\n46 | context.require_task(&ReturnHelloWorld).to_lowercase() | ------------ ^^^^^^^^^^^^^^^^^ expected `&ToLowerCase`, found `&ReturnHelloWorld` | | | arguments to this method are incorrect | = note: expected reference `&ToLowerCase` found reference `&non_incremental::test::test_require_task_problematic::ReturnHelloWorld`\nnote: method defined here --> src/lib.rs:18:6 |\n18 | fn require_task(&mut self, task: &T) -> T::Output; | ^^^^^^^^^^^^ For more information about this error, try `rustc --explain E0308`.\nerror: could not compile `pie` (lib test) due to previous error The problem is that execute of ToLowerCase takes a Context<Self>, so in impl Task for ToLowerCase it takes a Context<ToLowerCase>, while we're trying to require &ReturnHelloWorld through the context. This doesn't work as Context<ToLowerCase>::require_task only takes a &ToLowerCase as input. We could change execute of ToLowerCase to take Context<ReturnHelloWorld>: But that is not allowed: Compiling pie v0.1.0 (/pie)\nerror[E0276]: impl has stricter requirements than trait --> src/context/non_incremental.rs:45:21 |\n45 | fn execute<C: Context<ReturnHelloWorld>>(&self, context: &mut C) -> Self::Output { | ^^^^^^^^^^^^^^^^^^^^^^^^^ impl has extra requirement `C: Context<non_incremental::test::test_require_task_problematic::ReturnHelloWorld>` | ::: src/lib.rs:11:3 |\n11 | fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output; | --------------------------------------------------------------------- definition of `execute` from trait For more information about this error, try `rustc --explain E0276`.\nerror: could not compile `pie` (lib test) due to previous error This is because the Task trait defines execute to take a Context<Self>, thus every implementation of Task must adhere to this, so we can't solve it this way. Effectively, due to the way we defined Task and Context, we can only use a single task implementation . However, there is a good reason for this which will become more apparent once we implement incrementality. Why only a single Task type? The gist of it is that an incremental context wants to build a single dependency graph and cache task outputs, so that we can figure out from the graph whether a task is affected by a change, and just return its output if it is not affected. Therefore, a context implementation will maintain a Store<T>. A Context<ReturnHelloWorld> and Context<ToLowerCase> would then have a Store<ReturnHelloWorld> and Store<ToLowerCase> respectively. These two stores would then maintain two different dependency graphs, one where the nodes in the graph are ReturnHelloWorld and one where the nodes are ToLowerCase. But that won't work, as we need a single dependency graph over all tasks to figure out what is affected. There are several solutions to this problem. For example, we could use trait objects . However, this introduces a whole slew of problems because many traits that we use are not trait-object safe. Clone is not object safe because it requires Sized. Eq is not object safe because it uses Self. Serializing trait-objects is problematic. There are workarounds for all these things, but it is not pretty and very complicated. Another solution would be to encapsulate different tasks into a single type, using (procedural) macros to automatically generate this single task type. This solution is more feasible, but still introduces a lot of complexity which is not worth it in this tutorial. Therefore, in this tutorial we will keep it simple. For now, we will solve this by just using a single task type which is an enumeration of the different possible tasks. Replace the test with the following: Here, we instead define a single task Test which is an enum with two variants. In its Task implementation, we match ourselves and return \"Hello World!\" when the variant is ReturnHelloWorld. When the variant is ReturnHelloWorld, we require &Self::ReturnHelloWorld through the context, which is now valid because it is an instance of Test, and turn its string lowercase and return that. This now works due to only having a single task type. Run the test with cargo test to confirm it is working. Rust Help Enums define a type by a set of variants, similar to enums in other languages, sometimes called tagged unions in other languages. The match expression matches the variant and dispatches based on that, similar to switch statements in other languages. We have defined the API for the build system and implemented a non-incremental version of it. We're now ready to start implementing an incremental context in the next chapter. Download source code You can download the source files up to this point .","breadcrumbs":"Programmability » Non-Incremental Context » Test with Multiple Tasks","id":"7","title":"Test with Multiple Tasks"},"8":{"body":"In this chapter, we will implement an incremental build context. An incremental context selectively executes tasks — only those that are affected by a change. In other words, an incremental context executes the minimum number of tasks required to make all tasks up-to-date. However, due to dynamic dependencies, this is not trivial. We cannot first gather all tasks into a dependency tree and then topologically sort that, as dependencies are added and removed while tasks are executing . To do incremental builds in the presence of dynamic dependencies, we need to check and execute affected tasks one at a time, updating the dependency graph, while tasks are executing . To achieve this, we will employ a technique called top-down incremental building , where we start checking if a top (root) task needs to be executed, and recursively check whether dependent tasks should be executed until we reach the bottom (leaf) task(s), akin to a depth-first search. Furthermore, build systems almost always interact with the file system in some way. For example, tasks read configuration and source files, or write intermediate and binary files. Thus, a change in a file can affect a task that reads it, and executing a task can result in writing to new or existing files. Therefore, we will also keep track of file dependencies . Like task dependencies, file dependencies are also tracked dynamically while tasks are executing. There are several ways to check if a file dependency is consistent (i.e., has not changed), such as checking the last modification date, or comparing a hash. To make this configurable on a per-dependency basis, we will implement stamps . A file stamp is just a value that is produced from a file, such as the modification date or hash, that is stored with the file dependency. To check if a file dependency is consistent, we just stamp the file again and compare it with the stored stamp. Similarly, we can employ stamps for task dependencies as well by stamping the output of a task. To achieve incrementality, we will continue with these steps in the following sections: Extend Context with a method to require a file , enabling tasks to specify dynamic dependencies to files. Implement file stamps and task output stamps , and extend Context with methods to select stampers , enabling tasks to specify when a dependency is consistent. Implement dynamic dependencies and their consistency checking . Implement a dependency graph store with methods to query and mutate the dependency graph. Implement the top-down incremental context that incrementally executes tasks.","breadcrumbs":"Incrementality » Introduction","id":"8","title":"Introduction"},"9":{"body":"Since build systems frequently interact with files, and changes to files can affect tasks, we need to keep track of file dependencies. Therefore, we will extend the Context API with methods to require files , enabling tasks to specify dynamic dependencies to files. Add a method to the Context trait in pie/src/lib.rs: require_file is similar to requiring a task, but instead takes a path to a file or directory on the filesystem as input. We use AsRef<Path> as the type for the path, so that we can pass anything in that can dereference to a path. For example, str has an AsRef<Path> implementation, so we can just use \"test.txt\" as a path. As an output, we return Result<Option<File>, io::Error>, with File being a handle to an open file. The reason for this complicated type is: An incremental context will want to read the metadata (such as the last modified date) of the file, or create a hash over the file, to be able to detect changes. Because getting metadata or reading the file can fail, and we want to propagate this error, we return a Result with io::Error as the error type. Tasks can create a dependency to a file that does not exist, and the existence of that file affects the task. For example, a task that prints true or false based on if a file exists. If the file does not exist (or it is a directory), we cannot open it, so we cannot return a File, hence we use Option<File> to return None. Otherwise, we return Ok(Some(file)) so that the task can read the opened file. Rust Help Recoverable error handling in Rust is done with the Result<T, E> type, which can either be Ok(t) or Err(e). In contrast to many languages which use exceptions, throwing, and exception handling; Rust treats recoverable errors just as regular values. Similarly, optional values in Rust are defined using the Option<T> type, which can either be Some(t) or None. Rust has many traits for converting values or references into others, which provides a lot of convenience in what would otherwise require a lot of explicit conversions. AsRef<T> is such a conversion trait, that can convert itself into &T. Here, we use AsRef<Path> as a generic with a trait bound to support many different kinds of values to the path argument in require_file. For example, we can call context.require_file(\"test.txt\") because str, which is the type of string constants, implements AsRef<Path> . You can also see this as a kind of method overloading, without having to provide concrete overloads for all supported types. Now we need to implement this method for NonIncrementalContext. However, because we will be performing similar file system operations in the incremental context as well, we will create some utility functions for this first. Add the fs module to pie/src/lib.rs: Create file pie/src/fs.rs with: use std::{fs, io};\nuse std::fs::{File, Metadata};\nuse std::path::Path; /// Gets the metadata for given `path`, returning:\n/// - `Ok(Some(metadata))` if a file or directory exists at given path,\n/// - `Ok(None)` if no file or directory exists at given path,\n/// - `Err(e)` if there was an error getting the metadata for given path.\npub fn metadata(path: impl AsRef<Path>) -> Result<Option<Metadata>, io::Error> { match fs::metadata(path) { Err(e) if e.kind() == io::ErrorKind::NotFound => Ok(None), Err(e) => Err(e), Ok(m) => Ok(Some(m)) }\n} /// Attempt to open file at given `path`, returning:\n/// - `Ok(Some(file))` if the file exists at given path, /// - `Ok(None)` if no file exists at given path (but a directory could exist at given path),\n/// - `Err(e)` if there was an error getting the metadata for given path, or if there was an error opening the file.\n///\n/// This function is necessary due to Windows returning an error when attempting to open a directory.\npub fn open_if_file(path: impl AsRef<Path>) -> Result<Option<File>, io::Error> { let file = match metadata(&path)? { Some(metadata) if metadata.is_file() => Some(File::open(&path)?), _ => None, }; Ok(file)\n} The metadata function gets the filesystem metadata given a path, and open_if_file opens the file for given path. The reason for these functions is that the standard library function std::fs::metadata treats non-existent files as an error, whereas we don't want to treat it as an error and just return None. Furthermore, open_if_file works around an issue where opening a directory on Windows (and possibly other operating systems) is an error, where we want to treat it as None again. The documentation comments explain the exact behaviour. Rust Help The ? operator makes it easy to propgate errors . Because errors are just values in Rust, to propgate an error, you'd normally have to match each result and manually propagate the error. The r? operator applied to a Result r does this for you, it basically desugars to something like match r { Err(e) => return Err(e), _ => {} }. Comments with three forward slashes /// are documentation comments that document the function/struct/enum/trait/etc. they are applied to. We will write some tests to confirm the behaviour, but for that we need utilities to create temporary files and directories. Furthermore, we will be writing more unit tests, integration tests, and even benchmarks in this tutorial, so we will set up these utilities in such a way that they are reachable by all these use cases. The only way to do that in Rust right now, is to create a separate crate and have the pie crate depend on it. And yes, we went from adding file dependencies, to creating file system utilities, to testing those file system utilities, to creating testing utilities, and now to making a crate for those testing utilities. Sorry about that 😅, we will start unwinding this stack soon! Next to the pie directory, create a directory named dev_shared. Create the dev_shared/Cargo.toml file with the following contents: [package]\nname = \"dev_shared\"\nversion = \"0.1.0\"\nedition = \"2021\" [dependencies]\ntempfile = \"3\" We've added the tempfile dependency here already, which is a crate that creates and automatically cleans up temporary files and directories. Rust Help We use other libraries (crates) by specifying dependencies . Because basically every Rust library adheres to semantic versioning , we can use \"3\" as a version requirement which indicates that we will use the most up-to-date 3.x.x version. Create the main library file dev_shared/src/lib.rs, with functions for creating temporary files and directories: use std::io; use tempfile::{NamedTempFile, TempDir}; /// Creates a new temporary file that gets cleaned up when dropped.\npub fn create_temp_file() -> Result<NamedTempFile, io::Error> { NamedTempFile::new() } /// Creates a new temporary directory that gets cleaned up when dropped.\npub fn create_temp_dir() -> Result<TempDir, io::Error> { TempDir::new() } Your directory structure should now look like this: ├── pie\n│ ├── src\n│ │ ├── lib.rs\n│ │ ├── context\n│ │ │ ├── mod.rs\n│ │ │ └── non_incremental.rs\n│ │ └── fs.rs\n│ ├── Cargo.toml\n│ ├── Cargo.lock\n│ └── target\n└── dev_shared ├── src │ └── lib.rs └── Cargo.toml To access these utility functions in the pie crate, add a dependency to dev_shared in pie/Cargo.toml along with another create that will help testing: We've also added the assert_matches crate, which is a handy library for asserting that a value matches a pattern. Note that these dependencies are added under dev-dependencies, indicating that these dependencies are only available when running tests, benchmarks, and examples. Therefore, users of our library will not depend on these crates, which is good, because temporary file management and assertions are not necessary to users of the library. Back to testing our filesystem utilities. Add the following tests to pie/src/fs.rs: #[cfg(test)]\nmod test { use std::fs::remove_file; use std::io; use assert_matches::assert_matches; use dev_shared::{create_temp_dir, create_temp_file}; use super::*; #[test] fn test_metadata_ok() -> Result<(), io::Error> { let temp_file = create_temp_file()?; let metadata = metadata(temp_file)?; assert_matches!(metadata, Some(metadata) => { assert!(metadata.is_file()); }); Ok(()) } #[test] fn test_metadata_none() -> Result<(), io::Error> { let temp_file = create_temp_file()?; remove_file(&temp_file)?; let metadata = metadata(&temp_file)?; assert!(metadata.is_none()); Ok(()) } #[test] fn test_open_if_file() -> Result<(), io::Error> { let temp_file = create_temp_file()?; let file = open_if_file(&temp_file)?; assert!(file.is_some()); Ok(()) } #[test] fn test_open_if_file_non_existent() -> Result<(), io::Error> { let temp_file = create_temp_file()?; remove_file(&temp_file)?; let file = open_if_file(&temp_file)?; assert!(file.is_none()); Ok(()) } #[test] fn test_open_if_file_on_directory() -> Result<(), io::Error> { let temp_dir = create_temp_dir()?; let file = open_if_file(temp_dir)?; assert!(file.is_none()); Ok(()) }\n} We test whether the functions conform to the specified behaviour. Unfortunately, we can't easily test when metadata and open_if_file should return an error, because we cannot disable read permissions on files via the Rust standard library. We use our create_temp_file and create_temp_dir utility functions to create temporary files and directories. The tempfile library takes care of deleting temporary files when they go out of scope (at the end of the test). We use assert_matches! to assert that metadata is Some(metadata), binding metadata in the => { ... } block in which we assert that the metadata describes a file. We will use this macro more in future integration tests. Rust Help Tests can return Result . When a test returns an Err, the test fails. This allows us to write more concise tests using error propagation. Now we are done unwinding our stack and have filesystem and testing utilities. Make the non-incremental context compatible by changing pie/src/context/non_incremental.rs: Since the non-incremental context does not track anything, we only try to open the file and return it, matching the contract in the documentation comment of the Context::require_file trait method. Confirm everything works with cargo test. 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construction This page was quickly created to make setup possible, but is unfinished. Make sure Rust is installed . We start by creating a new Rust crate. Create the pie directory and create the pie/Cargo.toml file with the following contents: [package]\nname = \"pie\"\nversion = \"0.1.0\"\nedition = \"2021\" Then create the pie/src directory and create the pie/src/lib.rs file, which will be left empty for now. Run cargo build to test if the project was set up correctly. The output should look something like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.12s Download source code You can download the source files up to this point .","breadcrumbs":"Programmability » Setup » Setup","id":"0","title":"Setup"},"1":{"body":"In this section, we will program the core API of the programmatic incremental build system. The unit of computation in a programmatic build system is a task . A task is kind of like a closure: a value that can be executed to produce their output. However, in an incremental programmatic build system, we also need to keep track of dynamic dependencies that are made while tasks are executing. Therefore, tasks are executed under a build context which enable them to create these dependencies. Tasks require other tasks through the context, creating a dynamic dependency and returning their up-to-date output. On the other hand, an incremental build context wants to selectively execute tasks — only those that are affected by a change. To that end, a build context will selectively execute tasks, tasks require other tasks through the build context, the build context selectively executes those, and so forth. Thus, tasks and build contexts are mutually recursive. Note In this tutorial, we will be using the words context , build context , and build system interchangeably, typically using just context as it is concise. Let's make tasks and contexts more concrete by defining them in code.","breadcrumbs":"Programmability » Programmable Build System API » Programmable Build System API","id":"1","title":"Programmable Build System API"},"10":{"body":"To check whether we need to execute a task, we need to check the dependencies of that task to see if any of them are inconsistent. To make this consistency checking configurable, we will use stamps. A dependency is inconsistent if after stamping, the new stamp is different from the old stamp. Therefore, we will implement a FileStamper that stamps files and produces a FileStamp, and an OutputStamper that stamps task outputs and produces an OutputStamp. Add the stamp module to pie/src/lib.rs: This module is public as users of the library will construct stampers.","breadcrumbs":"Incrementality » Stamps » Stamps","id":"10","title":"Stamps"},"11":{"body":"Create the pie/src/stamp.rs file and add: use std::fmt::Debug;\nuse std::io;\nuse std::path::Path;\nuse std::time::SystemTime; use crate::fs::metadata; #[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\npub enum FileStamper { Exists, Modified,\n} impl FileStamper { pub fn stamp(&self, path: impl AsRef<Path>) -> Result<FileStamp, io::Error> { match self { FileStamper::Exists => { Ok(FileStamp::Exists(path.as_ref().try_exists()?)) } FileStamper::Modified => { let Some(metadata) = metadata(path)? else { return Ok(FileStamp::Modified(None)); }; Ok(FileStamp::Modified(Some(metadata.modified()?))) } } }\n} #[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\npub enum FileStamp { Exists(bool), Modified(Option<SystemTime>),\n} We're implementing FileStamper as an enum for simplicity. A FileStamper has a single method stamp which takes something that can be dereferenced to a path, and produces a FileStamp or an error if creating the stamp failed. For now, we implement only two kinds of file stampers: Exists and Modified. The Exists stamper just returns a boolean indicating whether a file exists. It can be used to create a file dependency where a task behaves differently based on whether a file exists or not. The Modified stamper returns the last modification date if the file exists, or None if the file does not exist. We derive Eq for stamps so that we can compare them. Equal (same) stamps indicate a consistent dependency, unequal (different) indicates inconsistent. We also derive Eq for stampers, because the stamper of a dependency could change, making the dependency inconsistent.","breadcrumbs":"Incrementality » Stamps » File stamps","id":"11","title":"File stamps"},"12":{"body":"We implement task output stampers in a similar way. Add to pie/src/stamp.rs: #[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\npub enum OutputStamper { Inconsequential, Equals,\n} impl OutputStamper { pub fn stamp<O>(&self, output: O) -> OutputStamp<O> { match self { OutputStamper::Inconsequential => OutputStamp::Inconsequential, OutputStamper::Equals => OutputStamp::Equals(output), } }\n} #[derive(Clone, Eq, PartialEq, Debug)]\npub enum OutputStamp<O> { Inconsequential, Equals(O),\n} impl<O> OutputStamp<O> { pub fn as_ref(&self) -> OutputStamp<&O> { match self { OutputStamp::Inconsequential => OutputStamp::Inconsequential, OutputStamp::Equals(o) => OutputStamp::Equals(o), } }\n} The Inconsequential stamper simply ignores the output and always returns the same stamp (thus is always equal). It can be used to create a task dependency where we are interested in some side effect of a task, but don't care about its output. The Equals stamper simply wraps the output of a task, so the stamp is equal when the output is equal. Output stamps are generic over the task output type O. Trait bounds and derive macros Because O is used in the enum, the derive attributes on OutputStamp create bounds over O. Thus, OutputStamp is only Clone when O is Clone, OutputStamp is only Eq when O is Eq, and so forth. Because we declared Task::Output with bound Clone + Eq + Debug, we can be sure that OutputStamp is always Clone, Eq, and Debug. User-defined stamps FileStamper and OutputStamper could also be a trait which would allow users of the library to implement their own stampers. For simplicity, we do not explore that option in this tutorial. If you feel adventurous, you could try to implement this after you've finished the tutorial. Do note that this introduces a lot of extra generics and trait bounds everywhere, which can be a bit cumbersome.","breadcrumbs":"Incrementality » Stamps » Task output stamps","id":"12","title":"Task output stamps"},"13":{"body":"Finally, we write some tests. Add to pie/src/stamp.rs: #[cfg(test)]\nmod test { use std::fs::{remove_file, write}; use std::io; use dev_shared::create_temp_file; use super::*; #[test] fn test_exists_file_stamper() -> Result<(), io::Error> { let stamper = FileStamper::Exists; let temp_file = create_temp_file()?; let stamp = stamper.stamp(&temp_file)?; assert_eq!(stamp, stamper.stamp(&temp_file)?); remove_file(&temp_file)?; assert_ne!(stamp, stamper.stamp(&temp_file)?); Ok(()) } #[test] fn test_modified_file_stamper() -> Result<(), io::Error> { let stamper = FileStamper::Modified; let temp_file = create_temp_file()?; let stamp = stamper.stamp(&temp_file)?; assert_eq!(stamp, stamper.stamp(&temp_file)?); write(&temp_file, format!(\"{:?}\", stamp))?; let new_stamp = stamper.stamp(&temp_file)?; assert_ne!(stamp, new_stamp); let stamp = new_stamp; remove_file(&temp_file)?; assert_ne!(stamp, stamper.stamp(&temp_file)?); Ok(()) } #[test] fn test_inconsequential_output_stamper() { let stamper = OutputStamper::Inconsequential; let stamp = stamper.stamp(&1); assert_eq!(stamp, stamper.stamp(&1)); assert_eq!(stamp, stamper.stamp(&2)); } #[test] fn test_equals_output_stamper() { let stamper = OutputStamper::Equals; let stamp = stamper.stamp(&1); assert_eq!(stamp, stamper.stamp(&1)); assert_ne!(stamp, stamper.stamp(&2)); }\n} We test file stamps by creating a stamp, changing the file, creating a new stamp, and then compare the stamps. We test task output stamps by just passing a different output value to the stamp function, and then compare the stamps. Run cargo test to confirm the stamp implementation. If test test_modified_file_stamper fails, do continue to the next section, because we're going to fix it!","breadcrumbs":"Incrementality » Stamps » Tests","id":"13","title":"Tests"},"14":{"body":"Unfortunately, these tests may fail on some operating systems (Linux and Windows in my testing), due to an imprecise file last modified timer. What can happen is that we write to a file, making the OS update its modified time to 1000 (as an example, not a real timestamp), then very quickly write to the file again, making the OS update its modified time to 1000 again. Then, our test will fail because the stamp didn't change even though we expect it to change. This can happen with an imprecise timer that only increases once every millisecond (again, an example, not a real number) when we perform writes in between that millisecond. Even worse, our test can be flaky, sometimes succeeding if we write in between those milliseconds, sometimes failing if we write within a millisecond. To solve this, add a function to the filesystem testing utility crate. Change dev_shared/src/lib.rs: The write_until_modified function writes to the file, but ensures its modified time will change. Now change the tests in pie/src/stamp.rs to use this function: Now we use write_until_modified to write to the file, ensuring its modified time will change, ensuring the stamp will change when it should. Run cargo test to confirm the stamp implementation, which should succeed now.","breadcrumbs":"Incrementality » Stamps » Testing with file modified time, correctly","id":"14","title":"Testing with file modified time, correctly"},"15":{"body":"We now have a module dedicated to stamps. However, stampers are constructed by users of the library that author tasks, and they need to pass in these stampers when creating dependencies. Therefore, we need to update the Context trait to allow passing in these stampers. Change Context in pie/src/lib.rs: We add the require_file_with_stamper method which allow passing in a stamper. We add a default implementation for require_file that passes in a default stamper. The default is provided by default_require_file_stamper which can be overridden by context implementations. Now apply the same to tasks, changing Context again in pie/src/lib.rs: Update NonIncrementalContext in src/context/non_incremental.rs to implement the new methods: We just ignore the stampers in NonIncrementalContext, as they are only needed for incrementality. Run cargo test to confirm everything still works. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Stamps » Stamps in Context","id":"15","title":"Stamps in Context"},"16":{"body":"Now that we've implemented stamps, we can implement dynamic dependencies and their consistency checking. A dependency is inconsistent if after stamping, the new stamp is different from the old stamp. Therefore, dependencies need to keep track of their stamper and their previous stamp. To that end, we will implement the FileDependency and TaskDependency types with methods for consistency checking. We will also implement a Dependency type that abstracts over FileDependency and TaskDependency, which we will need for the dependency graph implementation in the next chapter. Add the dependency module to pie/src/lib.rs: This module is private, as users of the library should not construct dependencies. They should only create dependencies (and choose stampers) via Context methods.","breadcrumbs":"Incrementality » Dynamic Dependencies » Dynamic Dependencies","id":"16","title":"Dynamic Dependencies"},"17":{"body":"Create the pie/src/dependency.rs file and add: use std::fmt::Debug;\nuse std::fs::File;\nuse std::io;\nuse std::path::PathBuf; use crate::{Context, Task};\nuse crate::fs::open_if_file;\nuse crate::stamp::{FileStamp, FileStamper, OutputStamp, OutputStamper}; #[derive(Clone, Eq, PartialEq, Debug)]\npub struct FileDependency { path: PathBuf, stamper: FileStamper, stamp: FileStamp,\n} impl FileDependency { /// Creates a new file dependency with `path` and `stamper`, returning: /// - `Ok(file_dependency)` normally, /// - `Err(e)` if stamping failed. #[allow(dead_code)] pub fn new(path: impl Into<PathBuf>, stamper: FileStamper) -> Result<Self, io::Error> { let path = path.into(); let stamp = stamper.stamp(&path)?; let dependency = FileDependency { path, stamper, stamp }; Ok(dependency) } /// Creates a new file dependency with `path` and `stamper`, returning: /// - `Ok((file_dependency, Some(file)))` if a file exists at given path, /// - `Ok((file_dependency, None))` if no file exists at given path (but a directory could exist at given path), /// - `Err(e)` if stamping or opening the file failed. pub fn new_with_file(path: impl Into<PathBuf>, stamper: FileStamper) -> Result<(Self, Option<File>), io::Error> { let path = path.into(); let stamp = stamper.stamp(&path)?; let file = open_if_file(&path)?; let dependency = FileDependency { path, stamper, stamp }; Ok((dependency, file)) } /// Returns the path of this dependency. #[allow(dead_code)] pub fn path(&self) -> &PathBuf { &self.path } /// Returns the stamper of this dependency. #[allow(dead_code)] pub fn stamper(&self) -> &FileStamper { &self.stamper } /// Returns the stamp of this dependency. #[allow(dead_code)] pub fn stamp(&self) -> &FileStamp { &self.stamp } /// Checks whether this file dependency is inconsistent, returning: /// - `Ok(Some(stamp))` if this dependency is inconsistent (with `stamp` being the new stamp of the dependency), /// - `Ok(None)` if this dependency is consistent, /// - `Err(e)` if there was an error checking this dependency for consistency. pub fn is_inconsistent(&self) -> Result<Option<FileStamp>, io::Error> { let new_stamp = self.stamper.stamp(&self.path)?; if new_stamp == self.stamp { Ok(None) } else { Ok(Some(new_stamp)) } }\n} A FileDependency stores the path the dependency is about, the stamper used to create a stamp for this dependency, and the stamp that was created at the time the file dependency was made. The FileDependency::new_with_file function also returns the opened file if it exists, so that users of this function can read from the file without having to open it again. We add getter methods to get parts of the file dependency without allowing mutation. Since we will use those getter methods later, we annotate them with #[allow(dead_code)] to disable unused warnings. A file dependency is inconsistent when the stored stamp is not equal to a stamp that we create at the time of checking, implemented in FileDependency::is_inconsistent. For example, if we created a file dependency (with modified stamper) for a file that was modified yesterday, then modify the file, and then call is_inconsistent on the file dependency, it would return Some(new_stamp) indicating that the dependency is inconsistent. We implement an is_inconsistent method here instead of an is_consistent method, so that we can return the changed stamp when the dependency is inconsistent, which we will use for debug logging purposes later. Creating and checking a file dependency can fail due to file operations failing (for example, cannot access the file), so we propagate those errors.","breadcrumbs":"Incrementality » Dynamic Dependencies » File dependencies","id":"17","title":"File dependencies"},"18":{"body":"Task dependencies are implemented in a similar way. Add to pie/src/dependency.rs: #[derive(Clone, Eq, PartialEq, Debug)]\npub struct TaskDependency<T, O> { task: T, stamper: OutputStamper, stamp: OutputStamp<O>,\n} impl<T: Task> TaskDependency<T, T::Output> { /// Creates a new `task` dependency with `stamper` and `output`. pub fn new(task: T, stamper: OutputStamper, output: T::Output) -> Self { let stamp = stamper.stamp(output); Self { task, stamper, stamp } } /// Returns the task of this dependency. #[allow(dead_code)] pub fn task(&self) -> &T { &self.task } /// Returns the stamper of this dependency. #[allow(dead_code)] pub fn stamper(&self) -> &OutputStamper { &self.stamper } /// Returns the stamp of this dependency. #[allow(dead_code)] pub fn stamp(&self) -> &OutputStamp<T::Output> { &self.stamp } /// Checks whether this task dependency is inconsistent, returning: /// - `Some(stamp)` if this dependency is inconsistent (with `stamp` being the new stamp of the dependency), /// - `None` if this dependency is consistent. pub fn is_inconsistent<C: Context<T>>(&self, context: &mut C) -> Option<OutputStamp<T::Output>> { let output = context.require_task(&self.task); let new_stamp = self.stamper.stamp(output); if new_stamp == self.stamp { None } else { Some(new_stamp) } }\n} A TaskDependency stores the task the dependency is about, along with its stamper and stamp that is created when the dependency is created. Task dependencies are generic over the type of tasks T, and their type of outputs O. We also add immutable getters here. Trait bounds on structs We chose not to put a Task trait bound on TaskDependency, and instead put the bound on the impl. There are several up and downsides that should be considered when making such a decision. The main upside for putting the Task bound on the TaskDependency struct, is that we can leave out O and use OutputStamp<T::Output> as the type of the stamp field. This cuts down a generic parameter, which reduces boilerplate. The downside is that we need to then put the Task bound on every struct that uses TaskDependency, which increases boilerplate. In this case, we chose not to put the trait bound on the struct to prevent that trait bound from bubbling up into other structs that use TaskDependency, as it would need to appear in almost every struct in the library. A task dependency is inconsistent if, after recursively checking it, its stamp has changed, implemented in TaskDependency::is_inconsistent. Usually, this will be using the Equals task output stamper, so a task dependency is usually inconsistent when the output of the task changes. Because we need to recursively check the task, TaskDependency::is_inconsistent requires a context to be passed in. Again, there is more mutual recursion here. This recursive consistency checking is one of the core ideas that make programmatic incremental build systems possible. But why is this so important? Why do we need recursive checking? Well, we want our build system to be sound , meaning that we must execute all tasks that are affected by a change. When we do not execute a task that is affected by a change , we are unsound , and introduce an incrementality bug ! Because of dynamic dependencies, a change in a leaf in the dependency tree may affect a task at the root. For example, a compilation task depends on a task that reads a configuration file, which depends on the configuration file. A change to a configuration file (leaf) affects a task that reads the configuration file, which in turn affects the compilation task (root). Therefore, we need to recursively check the dependency tree in order to execute all tasks affected by changes. A different way to think about this, is to think about the invariant of the dependency consistency checking. The invariant is that a dependency is consistent if and only if the subtree of that dependency is consistent, and the dependency itself is consistent. The easiest way to adhere to this invariant, is recursive checking. A final note about recursive checking is that tasks can be executed during it, and executing task can lead to new dynamic dependencies. However, recursive checking handles this without problems because these dependencies are created through the Context, which in turn will call is_inconsistent when needed.","breadcrumbs":"Incrementality » Dynamic Dependencies » Task dependencies","id":"18","title":"Task dependencies"},"19":{"body":"Finally, we create a Dependency enum that abstracts over these two kinds of dependencies. Add to pie/src/dependency.rs: #[derive(Clone, Eq, PartialEq, Debug)]\npub enum Dependency<T, O> { RequireFile(FileDependency), RequireTask(TaskDependency<T, O>),\n} #[derive(Clone, Eq, PartialEq, Debug)]\npub enum InconsistentDependency<O> { File(FileStamp), Task(OutputStamp<O>),\n} impl<T: Task> Dependency<T, T::Output> { /// Checks whether this dependency is inconsistent, returning: /// - `Ok(Some(stamp))` if the dependency is inconsistent (with `stamp` being the new stamp of the dependency), /// - `Ok(None)` if the dependency is consistent, /// - `Err(e)` if there was an error checking the dependency for consistency. pub fn is_inconsistent<C: Context<T>>(&self, context: &mut C) -> Result<Option<InconsistentDependency<T::Output>>, io::Error> { let option = match self { Dependency::RequireFile(d) => d.is_inconsistent()? .map(|s| InconsistentDependency::File(s)), Dependency::RequireTask(d) => d.is_inconsistent(context) .map(|s| InconsistentDependency::Task(s)), }; Ok(option) }\n} Dependency just merges the two kinds of dependencies and provides an is_inconsistent method that calls the corresponding method. We return the changed stamp here as well for debug logging later. We wrap the changed stamp in an InconsistentDependency enum, and map to the correct variant if there is an inconsistency. Because Dependency can store a TaskDependency, we need to propagate the T and O generics. Likewise, InconsistentDependency propagates the O generic for OutputStamp. User-defined dependencies Like with stampers, Dependency could also be a trait to allow users of the library to define their own dependencies. However, as we will see later, these dynamic dependencies also require validation, and I am unsure how such a Dependency trait should look. Therefore, we don't have an appendix on how to implement this. But, if you have an idea on how to this nicely (after you've completed this tutorial), please get in touch!","breadcrumbs":"Incrementality » Dynamic Dependencies » Dependency enum","id":"19","title":"Dependency enum"},"2":{"body":"Since we want users of the build system to implement their own tasks, we will define Task as a trait. Likewise, we will also be implementing multiple contexts in this tutorial, so we will also define Context as a trait. Add the following code to your pie/src/lib.rs file: use std::fmt::Debug;\nuse std::hash::Hash; /// A unit of computation in a programmatic incremental build system.\npub trait Task: Clone + Eq + Hash + Debug { /// Type of output this task returns when executed. type Output: Clone + Eq + Debug; /// Execute the task, using `context` to specify dynamic dependencies, returning `Self::Output`. fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output;\n} /// Programmatic incremental build context, enabling tasks to create dynamic dependencies that context implementations /// use for incremental execution.\npub trait Context<T: Task> { /// Requires given `task`, recording a dependency and selectively executing it. Returns its up-to-date output. fn require_task(&mut self, task: &T) -> T::Output;\n} Note If this seems overwhelming to you, don't worry. We will go through the API and explain things. But more importantly, the API should become more clear once we implement it in the next section and subsequent chapters. Furthermore, if you're new to Rust and/or need help understanding certain concepts, I will try to explain them in Rust Help blocks. They are collapsed by default to reduce distraction, clicking the header opens them. See the first Rust Help block at the end of this section. The Task trait has several supertraits that we will need later in the tutorial to implement incrementality: Eq and Hash: to check whether a task is equal to another one, and to create a hash of it, so we can use a HashMap to get the output of a task if it is up-to-date. Clone: to create a clone of the task so that we can store it in the HashMap without having ownership of it. Debug: to format the task for debugging purposes. A Task has a single method execute, which takes a reference to itself (&self), and a mutable reference to a context (context: &mut C), and produces a value of type Self::Output. Because Context is a trait, we use generics (<C: Context<Self>>) to have execute work for any Context implementation (ignoring the Self part for now). The execute method takes self by reference such that a task can access its data, but not mutate it, as that could throw off incrementality by changing the hash/equality of the task. Finally, the type of output of a task is defined by the Output associated type, and this type must implement Clone, Eq, and Debug for the same reason as Task. The Context trait is generic over Task, allowing it to work with any task implementation. It has a single method require_task for creating a dependency to a task and returning its up-to-date result. It takes a mutable reference to itself, enabling dependency tracking and caching, which require mutation. Because of this, the context reference passed to Task::execute is also mutable. This Task and Context API mirrors the mutually recursive definition of task and context we discussed earlier, and forms the basis for the entire build system. Build the project by running cargo build. The output should look something like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.06s Rust Help The Rust Programming Language is an introductory book about Rust. I will try to provide links to the book where possible. Rust has a module system for project organization. The lib.rs file is the \"main file\" of a library. Later on, we will be creating more modules in different files. Things are imported into the current scope with use statements. We import the Debug and Hash traits from the standard library with two use statements. Use statements use paths to refer to nested things. We use :: for nesting, similar to namespaces in C++. Rust models the concept of ownership to enable memory safety without a garbage collector. The execute method accepts a reference to the current type, indicated with &: &self. This reference is immutable , meaning that we can read data from it, but not mutate it. In Rust, things are immutable by default. On the other hand, execute accepts a mutable reference to the context, indicated with &mut: context: &mut C, which does allow mutation. Traits are the main mechanism for open extensibility in Rust. They are comparable to interfaces in class-oriented languages. We will implement a context and tasks in the next section. Supertraits are a kind of inheritance. The : Clone + Eq + Hash + Debug part of the Task trait means that every Task implementation must also implement the Clone, Eq, Hash, and Debug traits. These traits are part of the standard library: Clone for duplicating values. Eq for equality comparisons, along with PartialEq . Hash for turning a value into a hash. Debug for formatting values in a programmer-facing debugging context. Clone and Eq are so common that they are part of the Rust Prelude , so we don't have to import those with use statements. Methods are functions that take a form of self as the first argument. This enables convenient object-like calling syntax: context.require_task(&task);. Associated types are a kind of placeholder type in a trait such that methods of traits can use that type. In Task this allows us to talk about the Output type of a task. In Context this allows us to refer to both the Task type T and its output type T::Output. The :: syntax here is used to access associated types of traits. The Self type in a trait is a built-in associated type that is a placeholder for the type that is implementing the trait. The Task trait is defined with pub (public) visibility , such that users of the library can implement it. Because Task uses Context in its public API, Context must also be public, even though we don't intend for users to implement their own Context. Download source code You can download the source files up to this point .","breadcrumbs":"Programmability » Programmable Build System API » API Implementation","id":"2","title":"API Implementation"},"20":{"body":"As usual, we write some tests to confirm the behaviour. Add tests to pie/src/dependency.rs: #[cfg(test)]\nmod test { use std::fs::write; use std::io::{self, Read}; use dev_shared::{create_temp_file, write_until_modified}; use crate::context::non_incremental::NonIncrementalContext; use super::*; /// Task that reads file at given path and returns it contents as a string. #[derive(Clone, PartialEq, Eq, Hash, Debug)] struct ReadStringFromFile(PathBuf); impl Task for ReadStringFromFile { type Output = String; fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output { let mut string = String::new(); let file = context.require_file(&self.0).expect(\"failed to require file\"); if let Some(mut file) = file { file.read_to_string(&mut string).expect(\"failed to read from file\"); }; string } } #[test] fn test_file_dependency_consistency() -> Result<(), io::Error> { let mut context = NonIncrementalContext; let temp_file = create_temp_file()?; write(&temp_file, \"test1\")?; let file_dependency = FileDependency::new(temp_file.path(), FileStamper::Modified)?; let dependency: Dependency<ReadStringFromFile, String> = Dependency::RequireFile(file_dependency.clone()); assert!(file_dependency.is_inconsistent()?.is_none()); assert!(dependency.is_inconsistent(&mut context)?.is_none()); // Change the file, changing the stamp the stamper will create next time, making the file dependency inconsistent. write_until_modified(&temp_file, \"test2\")?; assert!(file_dependency.is_inconsistent()?.is_some()); assert!(dependency.is_inconsistent(&mut context)?.is_some()); Ok(()) } #[test] fn test_task_dependency_consistency() -> Result<(), io::Error> { let mut context = NonIncrementalContext; let temp_file = create_temp_file()?; write(&temp_file, \"test1\")?; let task = ReadStringFromFile(temp_file.path().to_path_buf()); let output = context.require_task(&task); let task_dependency = TaskDependency::new(task.clone(), OutputStamper::Equals, output); let dependency = Dependency::RequireTask(task_dependency.clone()); assert!(task_dependency.is_inconsistent(&mut context).is_none()); assert!(dependency.is_inconsistent(&mut context)?.is_none()); // Change the file, causing the task to return a different output, changing the stamp the stamper will create next // time, making the task dependency inconsistent. write_until_modified(&temp_file, \"test2\")?; assert!(task_dependency.is_inconsistent(&mut context).is_some()); assert!(dependency.is_inconsistent(&mut context)?.is_some()); Ok(()) }\n} We test a file dependency by asserting that is_inconsistent returns Some after changing the file. Testing task dependencies requires a bit more work. We create task ReadStringFromFile that reads a string from a file, and then returns that string as output. We require the task to get its output (\"test1\"), and create a task dependency with it. Then, we change the file and check consistency of the task dependency. That recursively requires the task, the context will execute the task, and the task now returns (\"test2\"). Since we use the Equals output stamper, and \"test1\" does not equal \"test2\", the dependency is inconsistent and returns a stamp containing \"test2\". Note that we are both testing the specific dependencies (FileDependency and TaskDependency), and the general Dependency. Note Normally, a task such as ReadStringFromFile shound return a Result<String, io::Error>, but for testing purposes we are just using panics with expect. In the file dependency case, using Dependency requires an explicit type annotation because there is no task to infer the type from. We just use Dependency<ReadStringFromFile, String> as the type, and this is fine even though we don't use ReadStringFromFile in that test, because the Dependency::RequireFile variant does not use those types. Run cargo test to confirm everything still works. You will get some warnings about unused things, but that is ok as we will use them in the next section. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Dynamic Dependencies » Tests","id":"20","title":"Tests"},"21":{"body":"To do incremental building, we need to keep track of all files, tasks, their dependencies, and task outputs, in a dependency graph. This will be the responsibility of the Store data structure. Context implementations will use methods on Store to query and mutate the dependency graph. In other words, Store encapsulates the dependency graph. However, writing a dependency graph data structure is outside of the scope of this tutorial, so we will be using the pie_graph library which we prepared exactly for this use case. The graph from this library is a directed acyclic graph (DAG), meaning that edges are directed and there may be no cycles in edges, as that would prohibit topological orderings. Graph library The pie_graph library is a modified version of the great incremental-topo library which implements incremental topological ordering: it keeps the topological ordering up-to-date incrementally while nodes and edges are added and removed. That is exactly what we need, as dynamic dependencies prevents us from calculating the topological ordering in one go, and calculating the topological ordering after every task execution is prohibitively expensive. The implementation in the incremental-topo library is based on a paper by D. J. Pearce and P. H. J. Kelly that describes several dynamic topological sort algorithms for directed acyclic graphs. Add the pie_graph dependency to pie/Cargo.toml:","breadcrumbs":"Incrementality » Dependency Graph Store » Dependency Graph Store","id":"21","title":"Dependency Graph Store"},"22":{"body":"Add the store module to pie/src/lib.rs: This module is private, as users of the library should not interact with the store. Only Context implementations will use the store. Create the pie/src/store.rs file and add the following to get started: use std::path::{Path, PathBuf}; use pie_graph::{DAG, Node}; use crate::dependency::{Dependency, FileDependency, TaskDependency};\nuse crate::Task; /// Stores files and tasks, and their dependencies, in a DAG (directed acyclic graph). Provides operations to mutate\n/// and query this graph.\npub struct Store<T, O> { graph: DAG<NodeData<T, O>, Dependency<T, O>>,\n} #[derive(Debug)]\nenum NodeData<T, O> { File(PathBuf), Task { task: T, output: Option<O>, },\n} impl<T: Task> Default for Store<T, T::Output> { fn default() -> Self { Self { graph: DAG::default(), } }\n} The Store is generic over tasks T and their outputs O, like we have done before with Dependency. The DAG type from pie_graph represents a DAG with nodes and edges, and data attached to those nodes and edges. The nodes in our graph are either files or tasks, and the edges are dependencies. The first generic argument to DAG is the type of data to attach to nodes, which is NodeData<T, O> in our case. Because nodes can be files or tasks, NodeData<T, O> enumerates these, storing the path for files, and the task along with its output for tasks. We store file paths as PathBuf, which is the owned version of Path (similar to String being the owned version of str). The task output is stored as Option<O> because we can add a task to the graph without having executed it, so we don't have its output yet. The second argument is the type of data to attach to edges, which is Dependency<T, O>, using the Dependency enum we defined earlier. We implement Default for the store to initialize it. Deriving default We cannot derive this Default implementation even though it seems we should be able to, because the derived implementation will require T and O to be Default, and this is not always the case. This is because the Default derive macro is conservative and adds a : Default bound to every generic argument in the Default trait implementation, and there is no way to disable this behaviour. Therefore, we implement Default ourselves. There are several crates that have more configurable derive macros for these things, but adding an extra dependency to generate a few lines of code is not worth the extra compilation time, so we just implement it manually here.","breadcrumbs":"Incrementality » Dependency Graph Store » Store basics","id":"22","title":"Store basics"},"23":{"body":"A node in DAG is represented by a Node, which is a transparent identifier (sometimes called a handle ) that points to the node and its data. We can create nodes in the graph, and then query attached data (NodeData) given a node. So DAG allows us to go from Node to a PathBuf and task T through attached NodeData. However, we want each unique file and task to be represented by a single unique node in the graph. We need this for incrementality so that if the build system encounters the same task twice, we can find the corresponding task node in the graph the second time, check if it is consistent, and return its output if it is. To ensure unique nodes, we need to maintain the reverse mapping from PathBuf and T to Node ourselves, which we will do with HashMaps. This is also the reason for the Eq and Hash trait bounds on the Task trait, so we can use them as keys in HashMaps. Change pie/src/store.rs to add hash maps to map between these things: To prevent accidentally using a file node as a task node, and vice versa, change pie/src/store.rs to add specific types of nodes: The FileNode and TaskNode types are newtypes that wrap a Node into a specific type of node. The Borrow implementations will make subsequent code a bit more concise by automatically converting &FileNode and &TaskNodes to &Nodes. Newtypes Because the Nodes inside the newtypes are not public, it is not possible to construct a FileNode or TaskNode outside of this module. Therefore, if we only accept and create FileNode and TaskNode in the Store API, it is not possible to use the wrong kind of node. The Borrow implementation does leak outside of this module, but not outside of this crate (library). This is because the visibility of a trait implementation is the intersection of the visibilities of the trait and type it is implemented on. Borrow is public, but FileNode and TaskNode are only public within this crate. Thefore, modules of this crate can extract the Node out of FileNode and TaskNode. However, that Node cannot be used to construct a FileNode or TaskNode, so it is not a problem. Now we will add methods create nodes and to query their attached data. Add the following code to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Gets the file node for `path`, or creates a file node by adding it to the dependency graph. pub fn get_or_create_file_node(&mut self, path: impl AsRef<Path>) -> FileNode { let path = path.as_ref(); if let Some(file_node) = self.file_to_node.get(path) { *file_node } else { let node = self.graph.add_node(NodeData::File(path.to_path_buf())); let node = FileNode(node); self.file_to_node.insert(path.to_path_buf(), node); node } } /// Gets the path for `node`. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph. #[allow(dead_code)] pub fn get_file_path(&self, node: &FileNode) -> &PathBuf { let Some(NodeData::File(path)) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; path } /// Gets the task node for `task`, or creates a task node by adding it to the dependency graph. pub fn get_or_create_task_node(&mut self, task: &T) -> TaskNode { if let Some(node) = self.task_to_node.get(task) { *node } else { let node = self.graph.add_node(NodeData::Task { task: task.clone(), output: None, }); let node = TaskNode(node); self.task_to_node.insert(task.clone(), node); node } } /// Gets the task for `node`. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph. pub fn get_task(&self, node: &TaskNode) -> &T { let Some(NodeData::Task { task, .. }) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; task }\n} The get_or_create_file_node method creates file nodes. When we want to go from a file path (using impl AsRef<Path>) to a FileNode, either we have already added this file path to the graph and want to get the FileNode for it, or we have not yet added it to the graph yet and should add it. The former is handled by the if branch in get_or_create_file_node, where we just retrieve the FileNode from the file_to_node hash map. The latter is handled by the else branch where we add the node to the graph with graph.add_node which attaches the NodeData::File data to the node, and then returns a FileNode which we insert into the file_to_node map. The get_file_path method does the inverse. We get the attached data given a node, and extract the file path from it. Note that we are using panic! here to indicate that invalid usage of this method is an unrecoverable programming error that should not occur. Returning an Option<&PathBuf> makes no sense here, as the caller of this method has no way to recover from this. Because this is not an end-user-facing API (store module is private), we control all the calls to this method, and thus we are responsible for using these methods in a valid way. Therefore, when we call these methods, we should document why it is valid (if this is not immediately obvious), and we need to test whether we really use it in a valid way. We're also documenting the panics in a # Panics section in the documentation comment, as is common practice in Rust. Triggering these panics Because only Store can create FileNodes and TaskNodes, and all methods only take these values as inputs, these panics will not happen under normal usage. The only way to trigger these panics (in safe Rust) would be to create two stores, and use the nodes from one store in another. However, since this is a private module, we just need to make sure that we don't do that. There are some tricks to prevent even this kind of invalid usage. For example, the generativity crate generates unique identifiers based on lifetimes. However, that is a bit overkill, especially for an internal API, so we won't be using that. We implement similar methods for task nodes in get_or_create_task_node and get_task.","breadcrumbs":"Incrementality » Dependency Graph Store » Graph nodes","id":"23","title":"Graph nodes"},"24":{"body":"When we do not need to execute a task because it is consistent, we still need to return its output. Therefore, we store the task output in NodeData::Task and add methods to query and manipulate task outputs. Add the following code to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Checks whether task `node` has an output. Returns `false` if `node` does not have an output. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph. pub fn task_has_output(&self, node: &TaskNode) -> bool { let Some(NodeData::Task { output, .. }) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; output.is_some() } /// Gets the output for task `node`. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph, or if the task has no output. pub fn get_task_output(&self, node: &TaskNode) -> &T::Output { let Some(NodeData::Task { output: Some(output), .. }) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph, or does not have an output\", node); }; output } /// Sets the output for task `node` to `new_output`. /// /// # Panics /// /// Panics if task `node` was not found in the dependency graph. pub fn set_task_output(&mut self, node: &TaskNode, new_output: T::Output) { let Some(NodeData::Task { output, .. }) = self.graph.get_node_data_mut(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; output.replace(new_output); }\n} The task_has_output, get_task_output, and set_task_output methods manipulate task outputs in NodeData::Task. Again, we are using panics here to indicate unrecoverable programming errors.","breadcrumbs":"Incrementality » Dependency Graph Store » Task outputs","id":"24","title":"Task outputs"},"25":{"body":"Now we need methods to query and manipulate dependencies. The edges in the graph are dependencies between tasks and files. Tasks can depend on other tasks and files, but there are no dependencies between files. An edge does not have its own dedicated representation, and is simply represented by two nodes: the source node and the destination node of the edge. Add the following code to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Get all dependencies of task `src`. /// /// # Panics /// /// Panics in development builds if `src` was not found in the dependency graph. pub fn get_dependencies_of_task<'a>(&'a self, src: &'a TaskNode) -> impl Iterator<Item=&'a Dependency<T, T::Output>> + 'a { debug_assert!(self.graph.contains_node(src), \"BUG: node {:?} was not found in the dependency graph\", src); self.graph.get_outgoing_edge_data(src) } /// Add a file require `dependency` from task `src` to file `dst`. /// /// # Panics /// /// Panics if `src` or `dst` were not found in the dependency graph, or if a cycle is created by adding this dependency. pub fn add_file_require_dependency(&mut self, src: &TaskNode, dst: &FileNode, dependency: FileDependency) { match self.graph.add_edge(src, dst, Dependency::RequireFile(dependency)) { Err(pie_graph::Error::NodeMissing) => panic!(\"BUG: source node {:?} or destination node {:?} was not found in the dependency graph\", src, dst), Err(pie_graph::Error::CycleDetected) => panic!(\"BUG: cycle detected when adding file dependency from {:?} to {:?}\", src, dst), _ => {}, } } /// Adds a task require `dependency` from task `src` to task `dst`. /// /// # Errors /// /// Returns `Err(())` if adding this dependency to the graph creates a cycle. /// /// # Panics /// /// Panics if `src` or `dst` were not found in the dependency graph. pub fn add_task_require_dependency(&mut self, src: &TaskNode, dst: &TaskNode, dependency: TaskDependency<T, T::Output>) -> Result<(), ()> { match self.graph.add_edge(src, dst, Dependency::RequireTask(dependency)) { Err(pie_graph::Error::NodeMissing) => panic!(\"BUG: source node {:?} or destination node {:?} was not found in the dependency graph\", src, dst), Err(pie_graph::Error::CycleDetected) => Err(()), _ => Ok(()), } }\n} The get_dependencies_of_task method gets the dependencies (edge data of outgoing edges) of a task, and returns it as an iterator (which is empty if task has no dependencies). This method needs explicit lifetime annotations due to the signature of get_outgoing_edge_data and the way we return an iterator using impl Iterator<.... We're using debug_assert! here to trigger a panic indicating an unrecoverable programming error only in development mode, because this check is too expensive to run in release (optimized) mode. The add_file_require_dependency method adds a file dependency. Adding an edge to the graph can result in cycles, which are not allowed in a directed acyclic graph (DAG). Therefore, graph.add_edge can return an Err indicating that there is a cycle. In case of files, this cannot happen because files do not have outgoing dependencies, and the API enforces this by never taking a FileNode as a source (src) of an edge. Tasks can depend on other tasks, so they can create cycles. In add_task_require_dependency, we propagate the cycle detected error (by returning Err(())) to the caller because the caller has more information to create an error message for the user that made a cyclic task dependency.","breadcrumbs":"Incrementality » Dependency Graph Store » Dependencies","id":"25","title":"Dependencies"},"26":{"body":"Finally, when we determine that a task is inconsistent and needs to be executed, we first need to remove its output and remove its outgoing dependencies, as those will interfere with incrementality when not removed. We do NOT want to remove incoming dependencies, as that would remove dependencies from other tasks to this task, which breaks incrementality, so we can't just remove and re-add the task to the graph. Add the reset_task method that does this to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Reset task `src`, removing its output and removing all its outgoing dependencies. /// /// # Panics /// /// Panics if task `src` was not found in the dependency graph. pub fn reset_task(&mut self, src: &TaskNode) { if let Some(NodeData::Task { output, .. }) = self.graph.get_node_data_mut(src) { *output = None; } else { panic!(\"BUG: node {:?} was not found in the dependency graph\", src); } self.graph.remove_outgoing_edges_of_node(src); }\n} This will reset the task output back to None, and remove all outgoing edges (dependencies).","breadcrumbs":"Incrementality » Dependency Graph Store » Resetting tasks","id":"26","title":"Resetting tasks"},"27":{"body":"Now we've implemented everything we need for implementing the top-down context, but first we will write some tests.","breadcrumbs":"Incrementality » Dependency Graph Store » Tests","id":"27","title":"Tests"},"28":{"body":"Add the following code to pie/src/store.rs for testing the file mapping: #[cfg(test)]\nmod test { use crate::Context; use crate::stamp::{FileStamper, OutputStamper}; use super::*; /// Task that returns its owned string. Never executed, just used for testing the store. #[derive(Clone, PartialEq, Eq, Hash, Debug)] struct StringConstant(String); impl StringConstant { pub fn new(string: impl Into<String>) -> Self { Self(string.into()) } } impl Task for StringConstant { type Output = String; fn execute<C: Context<Self>>(&self, _context: &mut C) -> Self::Output { self.0.clone() } } #[test] fn test_file_mapping() { let mut store: Store<StringConstant, String> = Store::default(); let path_a = PathBuf::from(\"hello.txt\"); let node_a = store.get_or_create_file_node(&path_a); assert_eq!(node_a, store.get_or_create_file_node(&path_a)); // Same node assert_eq!(&path_a, store.get_file_path(&node_a)); // Same file path let path_b = PathBuf::from(\"world.txt\"); let node_b = store.get_or_create_file_node(&path_b); assert_eq!(node_b, store.get_or_create_file_node(&path_b)); assert_eq!(&path_b, store.get_file_path(&node_b)); assert_ne!(node_a, node_b); // Different nodes } #[test] #[should_panic] fn test_file_mapping_panics() { let mut fake_store: Store<StringConstant, String> = Store::default(); let fake_node = fake_store.get_or_create_file_node(\"hello.txt\"); let store: Store<StringConstant, String> = Store::default(); store.get_file_path(&fake_node); }\n} We create a simple task StringConstant because we need a Task implementation to test Store, as Store is generic over a Task type. We will never execute it because Store does not execute tasks. Test test_file_mapping checks whether the file node mapping works as expected: get_or_create_file_node calls with the same path should produce the same FileNode. get_or_create_file_node calls with different paths should produce different FileNodes. This works because \"hello.txt\" and \"world.txt\" are different paths, thus their Eq and Hash implementations ensure they get separate spots in the file_to_node hash map. Test test_file_mapping_panics triggers the panic in get_file_path by creating a FileNode with a \"fake store\", and then using that rogue file node in another store. While it is unlikely that we will make this mistake when using Store, it is good to confirm that this panics. Rust help The #[should_panic] attribute makes the test succeed if it panics, and fail if it does not panic.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing file mapping","id":"28","title":"Testing file mapping"},"29":{"body":"Test the task mapping by inserting the following code into the test module (before the last }): #[test] fn test_task_mapping() { let mut store = Store::default(); let task_a = StringConstant::new(\"Hello\"); let node_a = store.get_or_create_task_node(&task_a); assert_eq!(node_a, store.get_or_create_task_node(&task_a)); // Same node assert_eq!(&task_a, store.get_task(&node_a)); // Same task let task_b = StringConstant::new(\"World\"); let node_b = store.get_or_create_task_node(&task_b); assert_eq!(node_b, store.get_or_create_task_node(&task_b)); assert_eq!(&task_b, store.get_task(&node_b)); assert_ne!(node_a, node_b); // Different nodes } #[test] #[should_panic] fn test_task_mapping_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let store: Store<StringConstant, String> = Store::default(); store.get_task(&fake_node); } We test this in the same way as the file mapping. Again, this works because StringConstant(\"Hello\") and StringConstant(\"World\") are different due to their derived Eq and Hash implementations, which make them different due to the strings being different. Likewise, StringConstant::new(\"Hello\") and StringConstant::new(\"Hello\") are equal even if they are created with 2 separate invocations of new. These (in)equalities might seem quite obvious, but it is important to keep in mind because incrementality can only work if we can identify equal tasks at a later time, so that we can check their dependencies and return their cached output when those dependencies are consistent. Later on we will also see that this is important for soundness of the incremental build system.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing task mapping","id":"29","title":"Testing task mapping"},"3":{"body":"We set up the Task and Context API in such a way that we can implement incrementality. However, incrementality is hard , so let's start with an extremely simple non-incremental Context implementation to get a feeling for the API.","breadcrumbs":"Programmability » Non-Incremental Context » Non-Incremental Context","id":"3","title":"Non-Incremental Context"},"30":{"body":"Test task outputs by inserting the following code into the test module: #[test] fn test_task_outputs() { let mut store = Store::default(); let output_a = \"Hello\".to_string(); let task_a = StringConstant::new(&output_a); let node_a = store.get_or_create_task_node(&task_a); let output_b = \"World\".to_string(); let task_b = StringConstant::new(&output_b); let node_b = store.get_or_create_task_node(&task_b); // Assert that tasks have no output by default. assert!(!store.task_has_output(&node_a)); assert!(!store.task_has_output(&node_b)); // Set output for task A, assert that A has that output but B is unchanged. store.set_task_output(&node_a, output_a.clone()); assert!(store.task_has_output(&node_a)); assert_eq!(store.get_task_output(&node_a), &output_a); assert!(!store.task_has_output(&node_b)); // Set output for task B, assert that B has that output but A is unchanged. store.set_task_output(&node_b, output_b.clone()); assert!(store.task_has_output(&node_a)); assert_eq!(store.get_task_output(&node_a), &output_a); assert!(store.task_has_output(&node_b)); assert_eq!(store.get_task_output(&node_b), &output_b); } #[test] #[should_panic] fn test_task_has_output_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let store: Store<StringConstant, String> = Store::default(); store.task_has_output(&fake_node); } #[test] #[should_panic] fn test_get_task_output_panics() { let mut store = Store::default(); let node = store.get_or_create_task_node(&StringConstant::new(\"Hello\")); store.get_task_output(&node); } #[test] #[should_panic] fn test_set_task_output_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let mut store: Store<StringConstant, String> = Store::default(); store.set_task_output(&fake_node, \"Hello\".to_string()); } Test test_task_outputs ensures that: task_has_output only returns true if given task has an output, and that get_task_output returns the output set by set_task_output for given task. Test test_get_task_output_panics triggers a panic when we call get_task_output for a task that has no output, which is an invalid usage of Store that is more likely to happen than the other panics.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing task outputs","id":"30","title":"Testing task outputs"},"31":{"body":"Test dependencies by inserting the following code into the test module: #[test] fn test_dependencies() { let mut store = Store::default(); let output_a = \"Hello\".to_string(); let task_a = StringConstant::new(output_a.clone()); let node_a = store.get_or_create_task_node(&task_a); let output_b = \"World\".to_string(); let task_b = StringConstant::new(output_b.clone()); let node_b = store.get_or_create_task_node(&task_b); let path_c = PathBuf::from(\"hello.txt\"); let node_c = store.get_or_create_file_node(&path_c); assert_eq!(store.get_dependencies_of_task(&node_a).next(), None); assert_eq!(store.get_dependencies_of_task(&node_b).next(), None); // Add file dependency from task A to file C. let file_dependency_a2c = FileDependency::new(&path_c, FileStamper::Exists).unwrap(); store.add_file_require_dependency(&node_a, &node_c, file_dependency_a2c.clone()); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&node_a).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency_a2c.clone()))); assert_eq!(deps_of_a.get(1), None); assert_eq!(store.get_dependencies_of_task(&node_b).next(), None); // Add task dependency from task B to task A. let task_dependency_b2a = TaskDependency::new(task_a.clone(), OutputStamper::Equals, output_a.clone()); let result = store.add_task_require_dependency(&node_b, &node_a, task_dependency_b2a.clone()); assert_eq!(result, Ok(())); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&node_a).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency_a2c.clone()))); assert_eq!(deps_of_a.get(1), None); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&node_b).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireTask(task_dependency_b2a.clone()))); assert_eq!(deps_of_b.get(1), None); // Add file dependency from task B to file C. let file_dependency_b2c = FileDependency::new(&path_c, FileStamper::Exists).unwrap(); store.add_file_require_dependency(&node_b, &node_c, file_dependency_b2c.clone()); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&node_a).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency_a2c.clone()))); assert_eq!(deps_of_a.get(1), None); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&node_b).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireTask(task_dependency_b2a.clone()))); assert_eq!(deps_of_b.get(1), Some(&Dependency::RequireFile(file_dependency_b2c.clone()))); assert_eq!(deps_of_b.get(2), None); // Add task dependency from task A to task B, creating a cycle. let task_dependency_a2b = TaskDependency::new(task_a.clone(), OutputStamper::Equals, output_a.clone()); let result = store.add_task_require_dependency(&node_a, &node_b, task_dependency_a2b); assert_eq!(result, Err(())); // Creates a cycle: error } #[test] #[should_panic] fn test_get_dependencies_of_task_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let store: Store<StringConstant, String> = Store::default(); let _ = store.get_dependencies_of_task(&fake_node); } #[test] #[should_panic] fn test_add_file_require_dependency_panics() { let mut fake_store = Store::default(); let fake_file_node = fake_store.get_or_create_file_node(\"hello.txt\"); let fake_task_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let mut store: Store<StringConstant, String> = Store::default(); let dependency = FileDependency::new(\"hello.txt\", FileStamper::Exists).unwrap(); store.add_file_require_dependency(&fake_task_node, &fake_file_node, dependency); } #[test] #[should_panic] fn test_add_task_require_dependency_panics() { let mut fake_store = Store::default(); let output = \"Hello\".to_string(); let task = StringConstant::new(&output); let fake_task_node = fake_store.get_or_create_task_node(&task); let mut store: Store<StringConstant, String> = Store::default(); let dependency = TaskDependency::new(task, OutputStamper::Equals, output); let _ = store.add_task_require_dependency(&fake_task_node, &fake_task_node, dependency); } The test_dependencies test is a bit more involved because it ensures that: get_dependencies_of_task returns the dependencies of given task. If the task has no dependencies, the iterator is empty. We test if an iterator is empty by getting the first element of the iterator with .next() and assert that it is None. get_dependencies_of_task returns the dependencies of given task in the order in which they were added, which will be important for soundness later. The graph library returns dependencies in insertion order. add_task_require_dependency adds a dependency to the correct task. creating a cycle with add_task_require_dependency results in it returning Err(()). Note that the StringConstant task does not actually create file or task dependencies, but since Store never executes a task, we can pretend that it does in tests.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing dependencies","id":"31","title":"Testing dependencies"},"32":{"body":"Finally, test task reset by inserting the following code into the test module: #[test] fn test_reset() { let mut store = Store::default(); let output_a = \"Hello\".to_string(); let task_a = StringConstant::new(output_a.clone()); let task_a_node = store.get_or_create_task_node(&task_a); let output_b = \"World\".to_string(); let task_b = StringConstant::new(output_b.clone()); let task_b_node = store.get_or_create_task_node(&task_b); let path = PathBuf::from(\"hello.txt\"); let file_node = store.get_or_create_file_node(&path); // Set outputs for task A and B. store.set_task_output(&task_a_node, output_a.clone()); assert!(store.task_has_output(&task_a_node)); assert_eq!(store.get_task_output(&task_a_node), &output_a); store.set_task_output(&task_b_node, output_b.clone()); assert!(store.task_has_output(&task_b_node)); assert_eq!(store.get_task_output(&task_b_node), &output_b); // Add file dependency for task A and B. let file_dependency = FileDependency::new(&path, FileStamper::Exists).unwrap(); store.add_file_require_dependency(&task_a_node, &file_node, file_dependency.clone()); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&task_a_node).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency.clone()))); assert_eq!(deps_of_a.get(1), None); store.add_file_require_dependency(&task_b_node, &file_node, file_dependency.clone()); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&task_b_node).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireFile(file_dependency.clone()))); assert_eq!(deps_of_b.get(1), None); // Reset only task A. store.reset_task(&task_a_node); // Assert that task A is reset. assert!(!store.task_has_output(&task_a_node)); assert_eq!(store.get_dependencies_of_task(&task_a_node).next(), None); // Assert that task B is unchanged. assert!(store.task_has_output(&task_b_node)); assert_eq!(store.get_task_output(&task_b_node), &output_b); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&task_b_node).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireFile(file_dependency.clone()))); assert_eq!(deps_of_b.get(1), None); } #[test] #[should_panic] fn test_reset_task_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let mut store: Store<StringConstant, String> = Store::default(); store.reset_task(&fake_node); } Here, we ensure that a task with an output and dependencies, does not have an output and dependencies after a reset, while leaving another task untouched. Confirm that the store implementation works with cargo test. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Dependency Graph Store » Testing task reset","id":"32","title":"Testing task reset"},"33":{"body":"We've implemented all the prerequisites for incremental top-down building. Now we will create the TopDownContext type which implements the Context trait in an incremental way.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Top-down Context","id":"33","title":"Top-down Context"},"34":{"body":"Add the top_down module to pie/src/context/mod.rs: Create the pie/src/context/top_down.rs file and add the following to get started: use std::fs::File;\nuse std::io;\nuse std::path::Path; use crate::{Context, fs, Task};\nuse crate::dependency::{FileDependency, TaskDependency};\nuse crate::stamp::{FileStamper, OutputStamper};\nuse crate::store::{Store, TaskNode}; pub struct TopDownContext<T, O> { store: Store<T, O>,\n} impl<T: Task> TopDownContext<T, T::Output> { pub fn new() -> Self { Self { store: Store::default(), } }\n} impl<T: Task> Context<T> for TopDownContext<T, T::Output> { fn require_file_with_stamper<P: AsRef<Path>>(&mut self, path: P, stamper: FileStamper) -> Result<Option<File>, io::Error> { todo!() } fn require_task_with_stamper(&mut self, task: &T, stamper: OutputStamper) -> T::Output { todo!() }\n} The TopDownContext type is generic over tasks T and their outputs O, owns a Store, and can be created using new. TopDownContext implements Context, and the main challenge will be implementing the require_file_with_stamper and require_task_with_stamper methods incrementally and correctly .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Top-down context basics","id":"34","title":"Top-down context basics"},"35":{"body":"Tasks such as ReadStringFromFile which we've used in tests before call context.require_file to declare that they depend on a file in the filesystem. For incrementality, we need to add this dependency to the dependency graph. This dependency will go from the current executing task to the file. Therefore, we will need to keep track of the current executing task. Change pie/src/context/mod.rs to add a field for tracking the current executing task, and use it in require_file_with_stamper: We're not setting current_executing_task yet, as that is the responsibility of require_task_with_stamper which we will implement later. In require_file_with_stamper we're now getting the current executing task. If there is no current executing task, which only happens if a user directly calls require_file on a context, we don't make a dependency and just open the file. Now we need to add the file dependency, change pie/src/context/mod.rs to do this: We simply create or get an existing file node, create a file dependency, and add the file require dependency to the graph via store. Errors are propagated to the caller, so they can react accordingly to filesystem operation failures.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Requiring files","id":"35","title":"Requiring files"},"36":{"body":"To implement require_task_with_stamper, we need to check whether we should execute a task. A task should be executed either if it's new (it does not have an output stored yet), or if at least one of its dependencies is inconsistent. If we don't execute it, then it must have an output value and all its dependencies are consistent, so we just return its output value. Change pie/src/context/mod.rs to implement this logic: We first create or get an existing file node. Then, we check whether the task should be executed with should_execute_task which we still need to implement. If that returns true, we reset the task, set the current executing task, actually execute the task, restore the previous executing task, and set the task output. Otherwise, we get the output of the task from the store, which cannot panic because should_execute_task ensures that the task has an output if it returns false. Finally, we return the output. We still need to create a task dependency. Change pie/src/context/mod.rs to add the dependency: If there is no current executing task, which occurs when a user requires the initial task, we skip creating a dependency. Otherwise, we create a dependency and add it to the store. However, creating a task dependency can create cycles, and we need to handle that error. At this point, we need to make a hard decision about the API of our library. require_task_with_stamper returns the task output, with no opportunity to return an error. If we want to propagate this error, we'd need to change the Context::require_task API to return Result<T::Output, CycleError>. However, because tasks call these methods on Context, we'd also need to change Task::execute to return Result<T::Output, CycleError>. That would require all tasks to propagate these cycle errors every time they require another task. Furthermore, some tasks want to return their own kinds of errors, where T::Output will be Result<AnOutput, AnError>. In that case, the concrete return type would be Result<Result<AnOutput, AnError>, CycleError>, which is annoying to deal with. On the other hand, we can panic when a cycle is found, which requires no changes to the API. We do end up in a mostly unrecoverable state, so a panic is a valid option. However, this is not ideal, because it means the build system can panic due to invalid task dependencies created by the user of the system. Panics will (most of the time) stop the program, which can be annoying to deal with. This is a hard trade-off to make. Either we propagate errors which will not end the program but will introduce a lot of boilerplate and annoyance in task implementations. Or we panic which will end the program but introduces no boilerplate. In this tutorial, we will go with panics on cycles, because it results in a much simpler system. Recovering from panics Panics either abort the program (when panics are set to abort in Cargo.toml), or unwind the call stack and then end the program. When panics abort, there is nothing we can do about it. A panic will immediately abort the program. When panics unwind, the call stack is unwound, which still runs all destructors ( Drop ), and this unwinding can be caught. We can catch unwinding panics with catch_unwind , which is a way to recover from panics. This does require that the types used in the closure passed to catch_unwind are unwind safe . This is because panics exit a function early, which can mess up some invariants of your code. For example, a call to set a task output can be skipped when a panic occurs, breaking a code invariant. Therefore, types such as &mut T are not unwind safe by default, because these invariants can break under panics. Note that unwind safety is something different than the general safety guarantees provided by Rust: type-safe, memory-safe, thread-safe. An unwind unsafe type is still type-safe, memory-safe, and thread-safe. Unwind safety can be more easily achieved by using owned types which run destructors when the function call ends, which work under normal circumstances, but also when unwinding panics. In the context of the PIE build system, if we panic on unrecoverable errors, but want to allow catching these panics, we need to think about unwind safety. At any point we panic, we need to think about keeping the system in a valid state. Another way to recover from panics is to run the panicking code on a different thread. If the code panics, it will only end that thread, effectively allowing panic recovery. However, this does require some form of thread-safety, beause you are moving a computation to a different thread. Furthermore, some platforms do not have access to threads, such as WASM, where this approach would not work. A final note is that care must be taken when unwiding panics across foreign function interfaces (FFI) .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Requiring tasks","id":"36","title":"Requiring tasks"},"37":{"body":"The final piece to our puzzle is the should_execute_task implementation. Add the following code to pie/src/context/top_down.rs: The premise of should_execute_task is simple: go over the dependencies of a task until dependency.is_inconsistent is true, at which we return true. If all dependencies are consistent, then return true only if the task has no output. Otherwise, return false. However, there are some complications due to borrowing. Checking if a task dependency is inconsistent requires recursive checking: TaskDependency::is_inconsistent requires a &mut Context to call Context::require_task, which in turn can require this method again. To that end, we pass self to is_inconsistent, because self is an instance of TopDownContext which implements Context. In this method, self is &mut self, a mutable borrow. Therefore, we cannot have any other borrows active while is_inconsistent is being called, because that would violate one of the safety mechanisms of Rust where mutable borrows are exclusive . Getting the task's dependencies from the store requires a borrow, so we cannot hold onto that borrow. We get around that here by cloning the dependencies and collecting them into a Vec. We also document this fact in a comment to explain to readers (us in the future) why we do this cloning, preventing refactorings only to hit that same borrowing issue again. Cloning and collecting does have a performance overhead as we need to clone the dependencies and heap allocate a Vec to store them. For this tutorial, that is fine, but in a real-world application we should minimize cloning if possible and look into reducing heap allocations. Reference counting Cloning a Dependency results in heap allocations, because cloning FileDependency clones a PathBuf which is a heap allocated string (basically a Vec<u8>), and cloning a TaskDependency clones the Task, which may require allocations as well. One way to avoid heap allocations in both kinds of dependencies is to store the PathBuf and Task in a reference-counting pointer Rc . Then, there will only be one heap allocated PathBuf and Task, and cloning just increments the reference count. The upside is that this approach is easy to implement and reduces allocations. The downside is that clones require incrementing the reference count, which is a write operation that does have a tiny bit of overhead. In many cases, this overhead is smaller than cloning data when the data is large enough or requires heap allocations. In our case, it would probably be worth doing this, but benchmarking is required to confirm this. Note that instead of always wrapping tasks in a Rc, task authors could implement Task on Rc<TheirTask> instead. Since Rc implements Clone, any time we task.clone(), we would just increase the reference count instead. When working in a multi-threaded situation, you would use the thread-safe Arc instead. String optimizations A technique for reducing allocations on strings (and string-like types such as PathBuf) is to apply small string optimization , where small strings are stored inline instead of requiring a heap allocation. This only works if the strings are usually small enough to fit inline on the stack (for example, 32 bytes). Another technique for strings is string interning, where equal strings are stored in a central place and then re-used everywhere. This technique is great when we use the same string a lot of times. That may be a good strategy for a build system, where we work with the same file paths over and over. There are several crates implementing these techniques, but I have not used one myself yet, so I cannot recommend one. Avoiding heap allocations from collecting into Vecs Collecting the elements of an iterator into a Vec requires heap allocations as Vec is allocated on the heap. We can avoid or at least reduce the number of heap allocations by re-using the same Vec instead of creating a new one. Instead of collecting, you would store the Vec in the struct, clear it, and then extend it with the iterator. When you clear a Vec, it removes all the elements, but keeps the heap allocated space. Only if you would add more elements than it has space for, another heap allocation would be required, which will happen less and less frequently when you keep reusing the same Vec. The downside is that you are keeping this heap allocated space for as long as you keep reusing the same Vec, which could waste some memory, but usually this is not a big problem. You could of course call vec.shrink_to_fit() after not using it for a while to free up this space. However, we cannot apply this technique here, because if we store the Vec in TopDownContext, we would run into the same borrowing problem again. This technique also requires that you have mutable access to the Vec in order to mutate it. Both of these limitations can be overcome by using a Cell . Cell allows mutation to its inner value in an immutable context. The catch is that you cannot get a reference to its inner value , you can only take the value out, mutate it, and then set it back. Unfortunately, even this technique cannot be fully applied to should_execute_task, because it is called recursively and therefore the Cell will be empty when we try to take the Vec out. If we want to avoid heap allocations from collecting new Vecs in should_execute_task, we would need to come up with a creative solution. But this is outside of the scope of even this extra information block, so we'll just leave it at that. Finally, we need to do something with dependency checking failures. We've ignored the case where dependency.is_inconsistent returns Err. When dependency checking result in an error, we should store the error for the user to investigate, and assume the dependency is inconsistent. Change pie/src/context/mod.rs to store dependency check errors and give users access to it: And then change pie/src/context/mod.rs to store these errors: It took us a while, but now we've implemented an incremental build system with dynamic dependencies 🎉. Let's set up an example to see the fruits of our labour.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Checking tasks","id":"37","title":"Checking tasks"},"38":{"body":"In this example, we will show off incrementality using two tasks: a task that reads a string from a file, and a task that writes a string to a file. The writing task gets the string by requiring another task. Therefore, we will have a read task with a file dependency, and a write task with a task and file dependency. Because we only support one type of task, we will wrap these tasks in an enum.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Incrementality Example","id":"38","title":"Incrementality Example"},"39":{"body":"Create the pie/examples directory, and create the pie/examples/incrementality.rs file with the following contents: #![allow(unused_imports, unused_variables)] use std::fs::{File, read_to_string, remove_file, write};\nuse std::io::{self, Read, Write};\nuse std::path::{Path, PathBuf}; use dev_shared::{create_temp_dir, write_until_modified};\nuse pie::{Context, Task};\nuse pie::context::top_down::TopDownContext;\nuse pie::stamp::FileStamper; /// Enumeration over file pseudo-tasks.\n#[derive(Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\nenum FileTask { ReadStringFromFile(ReadStringFromFile), WriteStringToFile(WriteStringToFile),\n} /// [`Task`] implementation for [`FileTask`], forwarding execute to the execute functions of the pseudo-tasks.\nimpl Task for FileTask { type Output = Result<String, io::ErrorKind>; fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output { match self { FileTask::ReadStringFromFile(t) => t.execute(context), FileTask::WriteStringToFile(t) => t.execute(context).map(|_| String::new()) } }\n} FileTask is the enum over the ReadStringFromFile and WriteStringToFile \"pseudo-tasks\" that we still need to define. We call these types pseudo-tasks, because they behave like tasks, but do not actually implement Task. We implement Task on FileTask instead, which forwards the execute method to the pseudo-tasks. Both tasks can fail due to using filesystem operations, so the output is a Result. We cannot use std::io::Error as the error in the Result, because it does not implement Clone nor Eq, which need to be implemented for task outputs. Therefore, we use std::io::ErrorKind which does implement these traits. On success, we return a String. Because WriteStringToFile will not return a value (i.e., ()) on success, we return an empty string with String::new(). It would be cleaner to define an FileOutput enum that enumerates the possible outputs of file tasks, which would include a variant for WriteStringToFile returning (). But to keep this example simple we don't do that.","breadcrumbs":"Incrementality » Incremental Top-Down Context » FileTask enumeration","id":"39","title":"FileTask enumeration"},"4":{"body":"Since we will be implementing three different contexts in this tutorial, we will separate them in different modules. Create the context module by adding a module to pie/src/lib.rs: This is a diff over pie/src/lib.rs where lines with a green background are additions, lines with a red background are removals, and lines with a grey background are context on where to add/remove lines, similar to diffs on source code hubs like GitHub. Create the pie/src/context directory, and in it, create the pie/src/context/mod.rs file with the following contents: pub mod non_incremental; Both modules are public so that users of our library can access context implementations. Create the pie/src/context/non_incremental.rs file, it will be empty for now. Your project structure should now look like: pie\n├── src\n│ ├── lib.rs\n│ └── context\n│ ├── mod.rs\n│ └── non_incremental.rs\n├── Cargo.toml\n├── Cargo.lock\n└── target Confirm your module structure is correct by building with cargo build. Rust Help Modules are typically separated into different files . Modules are declared with mod context. Then, the contents of a module are defined either by creating a sibling file with the same name: context.rs, or by creating a sibling directory with the same name, with a mod.rs file in it: context/mod.rs. Use the latter if you intend to nest modules, otherwise use the former. Like traits, modules also have visibility .","breadcrumbs":"Programmability » Non-Incremental Context » Context module","id":"4","title":"Context module"},"40":{"body":"Now add ReadStringFromFile to pie/examples/incrementality.rs: /// Pseudo-task that reads a string from a file.\n#[derive(Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\nstruct ReadStringFromFile(PathBuf, FileStamper); impl ReadStringFromFile { fn new(path: impl AsRef<Path>, stamper: FileStamper) -> FileTask { FileTask::ReadStringFromFile(Self(path.as_ref().to_path_buf(), stamper)) } fn execute<C: Context<FileTask>>(&self, context: &mut C) -> Result<String, io::ErrorKind> { println!(\"Reading from {} with {:?} stamper\", self.0.file_name().unwrap().to_string_lossy(), self.1); let file = context.require_file_with_stamper(&self.0, self.1).map_err(|e| e.kind())?; if let Some(mut file) = file { let mut string = String::new(); file.read_to_string(&mut string).map_err(|e| e.kind())?; Ok(string) } else { Err(io::ErrorKind::NotFound) } }\n} We've already defined a task like this before, but now it accepts a FileStamper, prints something when it gets executed, and propagates errors. Add WriteStringToFile to pie/examples/incrementality.rs: /// Pseudo-task that writes a string to a file, where the string is provided by another task. The string provider is /// boxed to prevent a cyclic definition of infinite size, due to this type being used in [`FileTask`].\n#[derive(Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\nstruct WriteStringToFile(Box<FileTask>, PathBuf, FileStamper); impl WriteStringToFile { fn new(string_provider: impl Into<Box<FileTask>>, path: impl Into<PathBuf>, stamper: FileStamper) -> FileTask { FileTask::WriteStringToFile(Self(string_provider.into(), path.into(), stamper)) } fn execute<C: Context<FileTask>>(&self, context: &mut C) -> Result<(), io::ErrorKind> { println!(\"Writing to {} with {:?} stamper\", self.1.file_name().unwrap().to_string_lossy(), self.2); let string = context.require_task(&self.0)?; let mut file = File::create(&self.1).map_err(|e| e.kind())?; file.write_all(string.as_bytes()).map_err(|e| e.kind())?; context.require_file_with_stamper(&self.1, self.2).map_err(|e| e.kind())?; Ok(()) }\n} What is special about this task, is that it takes another task as input! Tasks in a programmatic incremental build system are first-class, meaning that they are just values that can be passed around. This is similar to closures in Rust and other programming languages, which are functions (with some values captured from the environment), but are also values that can be passed around. Tasks can therefore be seen as a form of incremental closures, although they need to be executed under a Context for incrementality, whereas closures are more free-form. WriteStringToFile requires the task to (incrementally) get the string, creating a task dependency. Then it writes that string to a file, and requires that file to create a file dependency. Boxing to prevent cyclic definition We store the task as Box<FileTask> in order to prevent a cyclic definition, which would cause FileTask to have an undetermined size. This is due to several reasons: In Rust, values are stored on the stack by default. To store something on the stack, Rust needs to know its size at compile-time . The size of an enum is the size of the largest variant. The size of a struct is the sum of the size of the fields. If we don't box the task, to calculate the size of WriteStringToFile, we need to calculate the size of FileTask, which would require calculating the size of WriteStringToFile, and so forth. Therefore, we can't calulate the size of WriteStringToFile and FileTask, which is an error. Boxing solves this because Box<FileTask> allocates a FileTask on the heap, and then creates a pointer to it. Therefore, the size of Box<FileTask> is the size of one pointer, breaking the cycle in the size calculations. Note that this explanation simplifies many aspects of Rust's size calculation .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Read/write pseudo-tasks","id":"40","title":"Read/write pseudo-tasks"},"41":{"body":"We've implemented the tasks, now add a main function to pie/examples/incrementality.rs: fn main() -> Result<(), io::Error> { let temp_dir = create_temp_dir()?; let input_file = temp_dir.path().join(\"input.txt\"); write(&input_file, \"Hi\")?; let output_file = temp_dir.path().join(\"output.txt\"); let mut context = TopDownContext::new(); let read_task = ReadStringFromFile::new(&input_file, FileStamper::Modified); let write_task = WriteStringToFile::new(read_task.clone(), &output_file, FileStamper::Modified); println!(\"A) New task: expect `read_task` to execute\"); // `read_task` is new, meaning that we have no cached output for it, thus it must be executed. let output = context.require_task(&read_task)?; assert_eq!(&output, \"Hi\"); Ok(())\n} We create some temporary files, create our tasks, create a context, and require our first task. Run this example with cargo run --example incremental. You should see the println! in ReadStringFromFile appear in your console as the incremental context correctly determines that this task is new (i.e., has no output) and must be executed. It should look something like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 1.42s Running `/pie/target/debug/examples/incremental`\nA) New task: expect `read_task` to execute\nReading from input.txt with Modified stamper Reuse If we require the task again, what should happen? Insert the following code into the main method: println!(\"\\nB) Reuse: expect no execution\"); // `read_task` is not new and its file dependency is still consistent. It is consistent because the modified time of // `input_file` has not changed, thus the modified stamp is equal. let output = context.require_task(&read_task)?; assert_eq!(&output, \"Hi\"); Running with cargo run --example incremental should produce output like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.69s Running `/pie/target/debug/examples/incremental`\nA) New task: expect `read_task` to execute\nReading from input.txt with Modified stamper B) Reuse: expect no execution We don't see the println! from ReadStringFromFile, so it was not executed, so our incremental build system has correctly reused its output! Normally we would write a test to confirm that the task was executed the first time, and that it was not executed the second time. However, this is not trivial. How do we know if the task was executed? We could track it with a global mutable boolean that ReadStringFromFile keeps track of, but this quickly becomes a mess. Therefore, we will look into creating a proper testing infrastructure in the next chapter. For now, we will continue this example with several more interesting cases. The comments in the code explain in more detail why the build system behaves in this way. Inconsistent file dependency Insert into the main method: write_until_modified(&input_file, \"Hello\")?; println!(\"\\nC) Inconsistent file dependency: expect `read_task` to execute\"); // The file dependency of `read_task` is inconsistent due to the changed modified time of `input_file`. let output = context.require_task(&read_task)?; assert_eq!(&output, \"Hello\"); If we change the file (using write_until_modified to ensure that the modified time changes to trigger the Modified file stamper) and require the task, it should execute, because the file dependency of the task is no longer consistent. New write task, reuse read task Insert into the main method: println!(\"\\nD) New task, reuse other: expect only `write_task` to execute\"); // write_task` is new, but `read_task` is not new and its file dependency is still consistent. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello\"); Now we require a new WriteStringToFile task, which requires the ReadStringFromFile task. However, since the read task is still consistent (its file dependency is consistent), we only expect the write task to execute. We also assert that the write task wrote the correct string to the file. Sound incrementality with top-down building Insert into the main method: write_until_modified(&input_file, \"Hello, World!\")?; println!(\"\\nE) Inconsistent file and task dependency: expect both tasks to execute\"); // The file dependency of `read_task` is inconsistent. Then, the task dependency from `write_task` to `read_task` is // inconsistent because `read_task` now returns `\"Hello, World!\"` as output instead of \"Hello\", and thus its equals // output stamp is different. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); We change the input file and expect both read and write tasks to execute. We require the write task, which checks whether it should be executed by consistency checking its dependencies. The write task has a task dependency to the read task, so we check that for consistency. That recurses into requiring the read task, where we again check whether it should be executed. There, we discover that its input file dependency is inconsistent, so we execute the read task, which now returns \"Hello, World!\" instead of \"Hello\". Now we are back to the consistency check for the task dependency from the write task to the read task. The previous output stamp for that task dependency is Equals(\"Hello\"), but the new stamp is Equals(\"Hello, World!\"), so the task dependency is inconsistent! Therefore, we execute the write task, which correctly writes the new string to the output file. This example shows why we need top-down incremental building for sound incrementality. To ensure that the write task writes the up-to-date string to the output file, we first need to check (and possibly execute) the read task, ensuring it returns the up-to-date string. Early cutoff Insert into the main method: write_until_modified(&input_file, \"Hello, World!\")?; // Note: writing same file contents! println!(\"\\nF) Early cutoff: expect only `read_task` to execute\"); // File dependency of `read_task` is inconsistent because the modified time changed, but it returns the same output // `\"Hello, World!\"` because the contents of the file have not actually changed. Then, the task dependency from // `write_task` to `read_task` is consistent because its output did not change, and thus the equality output stamp is // the same. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); This is very similar to the last operation. The subtle difference is that we are writing to the input file, but we write the same contents . This results in a file with a new modified time, but the same contents. We expect the read task to execute, because its file dependency is inconsistent. However, the previous output stamp of the task dependency from write to read is Equals(\"Hello, World!\"), but the new one is also Equals(\"Hello, World!\") because the read task still returns \"Hello, World!\". Therefore, the task dependency is consistent, and we do not execute the write task. We call this early cutoff , because we can cut off building a task early, if we figure out its task dependency is consistent due to having the same output stamp . Early cutoff is possible due to the precise dependency tracking provided by dynamic dependencies. This is one of the pieces that makes this build system incremental: we don't execute the write task because it is not affected by a change. Different stampers If we want the write task to always write to the output file regardless of what the read task returns, we could implement an Always output stamp that is always inconsistent. In general, output (and file) stamps can be used to finetune incrementality, ensuring that tasks are only executed when they are really affected by a change. Regenerate output files Insert into the main method: write_until_modified(&output_file, \"\")?; println!(\"\\nG) Regenerate changed output file: expect only `write_task` to execute\"); // The file dependency of `write_task` to `output_file` is inconsistent. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); write_until_modified(&output_file, \"\")?; remove_file(&output_file)?; println!(\"\\nH) Regenerate deleted output file: expect only `write_task` to execute\"); // Same results when `output_file` is deleted. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); The write task writes to an output file and then creates a file dependency to it. Therefore, if we modify or remove the output file, and require the write task, it will regenerate the output file because the file dependency is inconsistent. Many build systems do not track this dependency to output files, which can result in incrementality bugs due to output files being deleted (for example, due to a git clean). By tracking these output file dependencies, we ensure that the output files are in a consistent state after every build. Don't regenerate ouput files We can omit the file dependency in the write task to not regenerate output files when they are changed or deleted, if desired. However, this is not recommended due to the possibility of (incrementality) bugs. Different tasks Insert into the main method: let input_file_b = temp_dir.path().join(\"input_b.txt\"); write(&input_file_b, \"Test\")?; let read_task_b_modified = ReadStringFromFile::new(&input_file_b, FileStamper::Modified); let read_task_b_exists = ReadStringFromFile::new(&input_file_b, FileStamper::Exists); println!(\"\\nI) Different tasks: expect `read_task_b_modified` and `read_task_b_exists` to execute\"); // Task `read_task`, `read_task_b_modified` and `read_task_b_exists` are different, due to their `Eq` implementation // determining that their paths and stampers are different. Therefore, `read_task_b_modified` and `read_task_b_exists` // are new tasks, and must be executed. let output = context.require_task(&read_task_b_modified)?; assert_eq!(&output, \"Test\"); let output = context.require_task(&read_task_b_exists)?; assert_eq!(&output, \"Test\"); The identity of tasks is determined by their Eq and Hash implementations, which are typically derived to compare and hash all their fields. Therefore, if we create read tasks for different input file input_file_b and different stamper FileStamper::Exists, these read tasks are not equal to the existing read task, and thus are new tasks with a different identity. We require read_task_b_modified and read_task_b_exists, they are new, and are therefore executed. Same file different stampers Insert into the main method: write_until_modified(&input_file_b, \"Test Test\")?; println!(\"\\nJ) Different stampers: expect only `read_task_b_modified` to execute\"); // Both `read_task_b_modified` and `read_task_b_exists` read from the same file, but they use different stampers. // Therefore, `read_task_b_modified` must be executed because the modified time has changed, but `read_task_b_exists` // will not be executed because its file dependency stamper only checks for existence of the file, and the existence // of the file has not changed. // // Note that using an `Exists` stamper for this task does not make a lot of sense, since it will only read the file // on first execute and when it is recreated. But this is just to demonstrate different stampers. let output = context.require_task(&read_task_b_modified)?; assert_eq!(&output, \"Test Test\"); let output = context.require_task(&read_task_b_exists)?; assert_eq!(&output, \"Test\"); Here we write to input_file_b and then require read_task_b_modified and read_task_b_exists. We expect read_task_b_modified to be executed, but read_task_b_exists to be skipped, because its file dependency only checks for the existence of the input file, which has not changed. This shows that tasks can depend on the same file with different stampers, which influences whether the tasks are affected by a file change individually. Of course, using an Exists stamper for ReadStringFromFile does not make a lot of sense, but this is for demonstration purposes only. Running cargo run --example incremental now should produce output like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.81s Running `/pie/target/debug/examples/incremental`\nA) New task: expect `read_task` to execute\nReading from input.txt with Modified stamper B) Reuse: expect no execution C) Inconsistent file dependency: expect `read_task` to execute\nReading from input.txt with Modified stamper D) New task, reuse other: expect only `write_task` to execute\nWriting to output.txt with Modified stamper E) Inconsistent file and task dependency: expect both tasks to execute\nReading from input.txt with Modified stamper\nWriting to output.txt with Modified stamper F) Early cutoff: expect only `read_task` to execute\nReading from input.txt with Modified stamper G) Regenerate changed output file: expect only `write_task` to execute\nWriting to output.txt with Modified stamper H) Regenerate deleted output file: expect only `write_task` to execute\nWriting to output.txt with Modified stamper I) Different tasks: expect `read_task_b_modified` and `read_task_b_exists` to execute\nReading from input_b.txt with Modified stamper\nReading from input_b.txt with Exists stamper J) Different stampers: expect only `read_task_b_modified` to execute\nReading from input_b.txt with Modified stamper Feel free to experiment more with this example (or new example files) before continuing. In the next chapter, we will define minimality and soundness, set up an infrastructure for testing those properties, and fix issues uncovered by testing. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Exploring incrementality","id":"41","title":"Exploring incrementality"},"42":{"body":"So far, the definitions we've used for minimality (incrementality) and soundness (correctness) have been a bit vague. Let's define this more concretely and precisely. An incremental and sound build system executes a task, if and only if, it is new or affected by a change. A task is new if it has not been executed before. When it is not new, a task is affected by a change when any of its dependencies are inconsistent. A file dependency is inconsistent if its file stamp changes. A task dependency is inconsistent if, after recursively checking the task, its output stamp changes. The recursive nature of checking task dependencies ensures that indirect changes can affect tasks and cause them to be correctly executed. By defining minimality and soundness in terms of dependencies, a task author forgetting to create a dependency or not choosing the correct stamper, does not change whether our build system is minimal and sound. PIE works under the assumption that task authors correctly list all dependencies that mark their task as affected by a change when it actually is. Preventing task authoring mistakes It is of course possible to make mistakes when authoring tasks, for example by creating a dependency to the wrong file, or by forgetting to create a file dependency. Unfortunately, there is no easy way to solve this. We will be writing a build event tracking system later, for which we will make an implementation that writes the entire build log to standard output. This build log can help debug mistakes by precisely showing what the build system is doing. A technique to catch file dependency mistakes is by sandboxing the filesystem to only have access to files that have been required. For example, Bazel can perform sandboxing , but it is not fully cross-platform, and still allows reading files from absolute paths. If a cross-platform and bulletproof sandboxing library exists, it could help catch file dependency mistakes in programmatic incremental build systems. Finally, the ultimate technique to catch file dependency mistakes is by automatically creating these dependencies using filesystem tracing, instead of having the task author make them. For example, the Rattle build system uses fsatrace to automatically create file dependencies, freeing task authors from having to think about file dependencies However, filesystem tracing is also not fully cross-platform and bulletproof, so it cannot always be used. Again, if a cross-platform and bulletproof filesystem tracing library exists, it would be extremely useful for programmatic incremental build systems. In this chapter, we will show minimality and soundness by testing. However, before testing, we make minimality and soundness more precise by changing the API to work with sessions , and implement build event tracking that is needed for testing. We will continue as follows: Introduce sessions and change the API to work with sessions: Session type for performing builds in a session, and the Pie type as the entry point that manages sessions. Create infrastructure to track build events for testing and debugging purposes. Create the Tracker trait, and implement a WritingTracker for debugging and EventTracker for testing. Find a soundness hole where multiple tasks write to the same file. Fix it by tracking file write dependencies separately from read dependencies, and catch these mistakes with dynamic verification. Find a soundness hole where a task reads from a file before another task writes to it. Fix it by catching these mistakes with dynamic verification. Find a soundness hole where cyclic task execution can still occur. Fix it by changing how task dependencies are stored. Proving minimality and soundness? While proving minimality and soundness would be a very interesting exercise, I am not at all an expert in formal proofs in proof assistants such as Coq , Agda , etc. If that is something that interests you, do pursue it and get in touch!","breadcrumbs":"Minimality and Soundness » Minimality and Soundness","id":"42","title":"Minimality and Soundness"},"43":{"body":"A task is consistent if its dependencies are consistent, and consistency of file dependencies is based on the filesystem. However, the filesystem can change during a build, meaning that a task can be affected by multiple different changes in one build. For example, after executing a task, it could immediately be affected by a change in a source file again without the build system knowing about it, and that would not be minimal nor sound. Therefore, we will introduce the concept of a session . Builds are only performed in a session, and at most one session may exist at any given time. In one session, each task is checked or executed at most once , meaning that changes made to source files during a session are not guaranteed to be detected . The result is that if a task is deemed inconsistent at the time it is checked, it will be executed, and will not be checked nor executed any more that session. If a task is deemed consistent at the time it is checked, it will not be checked any more that session. This simplifies minimality and soundness, as we do not need to worry about checking tasks multiple times. Furthermore, it is also an optimisation, as requiring the same task many times only results in one check. We will implement the Session type to hold all session data, and the Pie type as an entry point into the build system that manages a session.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Minimality with Sessions","id":"43","title":"Minimality with Sessions"},"44":{"body":"Change the imports in pie/src/lib.rs: Now add the Pie and Session types to pie/src/lib.rs: /// Main entry point into PIE, a sound and incremental programmatic build system.\npub struct Pie<T, O> { store: Store<T, O>,\n} impl<T: Task> Default for Pie<T, T::Output> { fn default() -> Self { Self { store: Store::default() } }\n} impl<T: Task> Pie<T, T::Output> { /// Creates a new build session. Only one session may be active at once, enforced via mutable (exclusive) borrow. pub fn new_session(&mut self) -> Session<T, T::Output> { Session::new(self) } /// Runs `f` inside a new build session. pub fn run_in_session<R>(&mut self, f: impl FnOnce(Session<T, T::Output>) -> R) -> R { let session = self.new_session(); f(session) }\n} /// A session in which builds are executed.\npub struct Session<'p, T, O> { store: &'p mut Store<T, O>, current_executing_task: Option<TaskNode>, dependency_check_errors: Vec<io::Error>,\n} impl<'p, T: Task> Session<'p, T, T::Output> { fn new(pie: &'p mut Pie<T, T::Output>) -> Self { Self { store: &mut pie.store, current_executing_task: None, dependency_check_errors: Vec::default(), } } /// Requires `task`, returning its up-to-date output. pub fn require(&mut self, task: &T) -> T::Output { todo!(\"Create TopDownContext with this session, and require the task\") } /// Gets all errors produced during dependency checks. pub fn dependency_check_errors(&self) -> impl Iterator<Item=&io::Error> { self.dependency_check_errors.iter() }\n} We set up the types such that Pie owns the store, and Session owns all data for a build session that TopDownContext previously owned. We put the store in Pie because we want to keep the dependency graph and task outputs between build sessions, otherwise we cannot be incremental. A Session is created with Pie::new_session, which borrows Pie mutibly, ensuring that there can only be one Session instance (per Pie instance). run_in_session is a convenience method that runs given function inside a new session. Session::require should require the task with the top-down context and return its up-to-date output, which we will implement once we've changed TopDownContext. The dependency check errors can be accessed with Session::dependency_check_errors. Note that Session also has access to Store, because TopDownContext needs access to the store. The store is mutibly borrowed from Pie. Therefore, the Session struct is generic over the 'p lifetime, where the p stands for Pie. We can leave out this lifetime in Pie::new_session, because the compiler infers it from us, but we must be explicit in structs and most impls. Check that the code compiles (but gives warnings) with cargo check. Now we need to modify TopDownContext to work with Session.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » PIE and Session","id":"44","title":"PIE and Session"},"45":{"body":"Change TopDownContext to only contain a mutable reference to Session in pie/src/context/top_down.rs: Here, we use lifetime 's to denote the lifetime of a session, and make TopDownContext generic over it. new now just accepts a mutable reference to the session. The get_dependency_check_errors method can be removed. We add a require_initial convenience method for Session. In the rest of the file, we need to update the impl lines to include the lifetimes, and we need to replace most instances of self with self.session. You could do this with the following find-replace regex: self\\.([\\w\\d_]+)\\. -> self.session.$1. Change pie/src/context/top_down.rs: Now we change Session to use TopDownContext.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Update TopDownContext","id":"45","title":"Update TopDownContext"},"46":{"body":"Change pie/src/lib.rs: We reset the current_executing_task to None, to be sure that we start a build without an executing task. Then, we just create a TopDownContext and call require_initial. Finally, we can now make the context module private, as users of the library run builds using Session, instead of having to create a context implementation. Change pie/src/lib.rs: Check that the code compiles with cargo check --lib. This only checks if the library builds, but not any examples. We need to update the incrementality example to work with these changes.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Update Session","id":"46","title":"Update Session"},"47":{"body":"First change some imports in pie/examples/incremental.rs: Then, change pie/examples/incremental.rs to use sessions: When we only require one task, we replace context.require_task with pie.new_session().require. When we want to require multiple tasks, we use new_session and call session.require multiple times. It is very important to create a new session each time in this example, because a task is only checked/executed once each session. If we use a single session, our changes are never seen, and we just execute each task once, which is not what we want. Therefore, every time we make changes to source files, or expect that changes have been made to source files, we must create a new session. Note In changes I and J, Rust is smart enough to allow creating a new session even though the previous session variable is still active, because it knows that we don't use that previous session anymore. Check that all code works by running cargo test. With this new API in place, and all code adjusted to work with it, we can continue with tracking build events. Download source code You can download the source files up to this point .","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Update incremental example","id":"47","title":"Update incremental example"},"48":{"body":"So far we have had no convenient way to inspect what our build system is doing, apart from println! debugging or attaching a debugger to the program. In this section, we will change that by tracking build events for debugging and integration testing purposes. We will: Create a Tracker trait that receives build events through method calls. The Tracker trait can be implemented in different ways to handle build events in different ways. Implement a NoopTracker that does nothing, removing the tracking overhead. Make the build system generic over Tracker, such that Context implementations call methods on the tracker to create build events. Implement a WritingTracker that writes build events to standard output or standard error, for debugging purposes. Implement an EventTracker that stores build events for later inspection, for integration testing purposes. Implement a CompositeTracker that forwards build events to 2 other trackers, so we can use multiple trackers at the same time.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Tracking Build Events","id":"48","title":"Tracking Build Events"},"49":{"body":"Add the tracker module to pie/src/lib.rs: Then create the pie/src/tracker directory, create the pie/src/tracker/mod.rs file, and add the following content: use std::path::Path; use crate::stamp::{FileStamp, FileStamper, OutputStamp, OutputStamper};\nuse crate::Task; /// Trait for tracking build events. Can be used to implement logging, event tracing, progress tracking, metrics, etc.\n#[allow(unused_variables)]\npub trait Tracker<T: Task> { /// Start a new build. fn build_start(&mut self) {} /// A build has been completed. fn build_end(&mut self) {} /// A file at `path` has been required, using `stamper` to create `stamp`. fn required_file(&mut self, path: &Path, stamper: &FileStamper, stamp: &FileStamp) {} /// Require `task` using `stamper`. fn require_task(&mut self, task: &T, stamper: &OutputStamper) {} /// A `task` has been required, resulting in consistent `output`, using `stamper` to create `stamp`, and task /// `was_executed`. fn required_task(&mut self, task: &T, output: &T::Output, stamper: &OutputStamper, stamp: &OutputStamp<T::Output>, was_executed: bool) {} /// Execute `task`. fn execute(&mut self, task: &T) {} /// A `task` has been executed, producing `output`. fn executed(&mut self, task: &T, output: &T::Output) {}\n} The Tracker trait is generic over Task. Note Here, we chose to put the Task constraint on the trait itself. This will not lead to cascading constraints, as the Tracker trait will only be used as a constraint in impls, not in structs or other traits. Tracker has methods corresponding to events that happen during a build, such as a build starting or ending, requiring a file, requiring a task, and executing a task. These methods accept &mut self so that tracker implementations can perform mutation, such as storing a build event. We provide default methods that do nothing so that implementors of Tracker only have to override the methods for events they are interested in. We use #[allow(unused_variables)] on the trait to not give warnings for unused variables, as all variables are unused due to the empty default implementations. Default methods Adding a method to Tracker with a default implementation ensures that implementations of Tracker do not have to be changed to work with the new method. This is both good and bad. Good because we can add methods without breaking compatibility. Bad because we can forget to handle a new method, which can lead to problems with for example a composite tracker that forwards events to 2 trackers. In this tutorial we chose the convenient option, but be sure to think about these kind of tradeoffs yourself! Check that the code compiles with cargo test.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Tracker trait","id":"49","title":"Tracker trait"},"5":{"body":"Implement the non-incremental context in pie/src/context/non_incremental.rs by adding: use crate::{Context, Task}; pub struct NonIncrementalContext; impl<T: Task> Context<T> for NonIncrementalContext { fn require_task(&mut self, task: &T) -> T::Output { task.execute(self) }\n} This NonIncrementalContext is extremely simple: in require_task we unconditionally execute the task, and pass self along so the task we're calling can require additional tasks. Let's write some tests to see if this does what we expect. Rust Help In Rust, libraries are called crates . We import the Context and Task traits from the root of your crate (i.e., the src/lib.rs file) using crate:: as a prefix. Structs are concrete types that can contain data through fields and implement traits, similar to classes in class-oriented languages. Since we don't need any data in NonIncrementalContext, we define it as a unit-like struct . Traits are implemented for a type with impl Context for NonIncrementalContext { ... }, where we then have to implement all methods and associated types of the trait. The Context trait is generic over Task, so in the impl block we introduce a type parameter T with impl<T>, and use trait bounds as impl<T: Task> to declare that T must implement Task. The last expression of a function – in this case task.execute(self) in require_task which is an expression because it does not end with ; – is used as the return value. We could also write that as return task.execute(self);, but that is more verbose.","breadcrumbs":"Programmability » Non-Incremental Context » Implementation","id":"5","title":"Implementation"},"50":{"body":"Add a no-op tracker, which is a tracker that does nothing, by adding the following code to pie/src/tracker/mod.rs: /// [`Tracker`] that does nothing.\n#[derive(Copy, Clone, Debug)]\npub struct NoopTracker;\nimpl<T: Task> Tracker<T> for NoopTracker {} Due to the default methods that do nothing on Tracker, this implementation is extremely simple. Removing tracker overhead We will use generics to select which tracker implementation to use. Therefore, all calls to trackers are statically dispatched, and could be inlined. Because NoopTracker only has empty methods, and those empty methods can be inlined, using NoopTracker will effectively remove all tracking code from your binary, thus removing the overhead of tracking if you don't want it. In this tutorial, we do not annotate methods with #[inline] , meaning that the Rust compiler (and the LLVM backend) will make its own decisions on what to make inlineable and what not. If you care about performance here, be sure to annotate those default empty methods with #[inline].","breadcrumbs":"Minimality and Soundness » Tracking Build Events » No-op tracker","id":"50","title":"No-op tracker"},"51":{"body":"Now we will make the build system generic over Tracker, and insert Tracker calls in context implementations. Make Pie and Session generic over Tracker by modifying pie/src/lib.rs: We use A as the generic argument for tracker types in the source code. The Pie struct owns the tracker, similarly to how it owns the store. Pie can be created with a specific tracker with with_tracker, and provides access to the tracker with tracker and tracker_mut. Default type We assign NoopTracker as the default type for trackers in Pie, so that no tracking is performed when we use the Pie type without an explicit tracker type. The Default implementation only works with NoopTracker, because we impl Default for Pie<T, T::Output>, which is equivalent to impl Default for Pie<T, T::Output, NoopTracker> due to the default type. We make Session generic over trackers, and mutibly borrow the tracker from Pie, again like we do with the store. For convenience, Session also provides access to the tracker with tracker and tracker_mut. Now we make TopDownContext generic over Tracker, and insert calls to tracker methods. Modify pie/src/context/top_down.rs: We make TopDownContext generic over trackers, and call methods on the tracker: build_start/build_end in require_initial to track build start and ends, required_file in require_file_with_stamper to track file dependencies, require_task/required_task in require_file_with_stamper to track task dependencies, execute/executed in require_task_with_stamper to track task execution start and ends. In require_file_with_stamper, we also extract should_execute into a variable, and pull dependency out of the if, so that we can pass the required data to tracker.required_task. Check that the code compiles with cargo test. Existing code should keep working due to the NoopTracker default type in Pie. We won't modify NonIncrementalContext to use a tracker, as NonIncrementalContext has no state, so we cannot pass a tracker to it.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Using the Tracker trait","id":"51","title":"Using the Tracker trait"},"52":{"body":"Now we can implement some interesting trackers. We start with a simple WritingTracker that writes build events to some writer. Add the writing module to pie/src/tracker/mod.rs: Then create the pie/src/tracker/writing.rs file and add: use std::io::{self, BufWriter, Stderr, Stdout, Write}; use crate::stamp::{OutputStamp, OutputStamper};\nuse crate::Task;\nuse crate::tracker::Tracker; /// [`Tracker`] that writes events to a [`Write`] instance, for example [`Stdout`].\n#[derive(Clone, Debug)]\npub struct WritingTracker<W> { writer: W, indentation: u32,\n} impl WritingTracker<BufWriter<Stdout>> { /// Creates a [`WritingTracker`] that writes to buffered standard output. pub fn with_stdout() -> Self { Self::new(BufWriter::new(io::stdout())) }\n}\nimpl WritingTracker<BufWriter<Stderr>> { /// Creates a [`WritingTracker`] that writes to buffered standard error. pub fn with_stderr() -> Self { Self::new(BufWriter::new(io::stderr())) }\n}\nimpl<W: Write> WritingTracker<W> { /// Creates a [`WritingTracker`] that writes to `writer`. pub fn new(writer: W) -> Self { Self { writer, indentation: 0, } }\n} The WritingTracker is generic over a writer W that must implement Write, which is a standard trait for writing bytes to something. with_stdout and with_stderr can be used to create buffered writers to standard output and standard error. new can be used to create a writer to anything that implements Write, such as a File. Add the Tracker implementation to pie/src/tracker/writing.rs: impl<W: Write, T: Task> Tracker<T> for WritingTracker<W> { fn required_task(&mut self, task: &T, _output: &T::Output, _stamper: &OutputStamper, _stamp: &OutputStamp<T::Output>, was_executed: bool) { if !was_executed { self.writeln(format_args!(\"✓ {:?}\", task)); self.flush(); } } fn execute(&mut self, task: &T) { self.writeln(format_args!(\"→ {:?}\", task)); self.indent(); self.flush(); } fn executed(&mut self, _task: &T, output: &T::Output) { self.unindent(); self.writeln(format_args!(\"← {:?}\", output)); self.flush(); }\n} #[allow(dead_code)]\nimpl<W: Write> WritingTracker<W> { fn writeln(&mut self, args: std::fmt::Arguments) { self.write_indentation(); writeln!(&mut self.writer, \"{}\", args).ok(); } fn write(&mut self, args: std::fmt::Arguments) { write!(&mut self.writer, \"{}\", args).ok(); } fn write_nl(&mut self) { write!(&mut self.writer, \"\\n\").ok(); } fn indent(&mut self) { self.indentation = self.indentation.saturating_add(1); } fn unindent(&mut self) { self.indentation = self.indentation.saturating_sub(1); } fn write_indentation(&mut self) { for _ in 0..self.indentation { write!(&mut self.writer, \" \").ok(); } } fn flush(&mut self) { self.writer.flush().ok(); }\n} We implement 3 tracker methods that write when: ✓: a task is required but was not executed (i.e., consistent), →: a task starts to execute, ←: when the task is done executing. The text to write is formatted with format_args!, which is passed into writeln using std::fmt::Arguments for flexibility. We flush the writer after every event to ensure that bytes are written out. When a task starts to execute, we increase indentation to signify the recursive checking/execution. When a task is done executing, we decrease the indentation again. Saturating arithmetic We use saturating_add and saturating_sub for safety, which are saturating arithmetic operations that saturate at the numeric bounds instead of overflowing. For example, 0u32.saturating_sub(1) will result in 0 instead of overflowing into 4294967295. These saturating operations are not really needed when calls to indent and unindent are balanced. However, if we make a mistake, it is better to write no indentation than to write 4294967295 spaces of indentation. Alternatively, we could use standard arithmetic operations, which panic on overflow in debug/development mode, but silently overflow in release mode. Failing writes Writes can fail, but we silently ignore them in this tutorial (with let _ = ...) for simplicity. You could panic when writing fails, but panicking when writing to standard output fails is probably going a bit too far. You could store the latest write error and give access to it, which at least allows users of WritingTracker check for some errors. In general, tracking events can fail, but the current Tracker API does not allow for propagating these errors with Result. This in turn because TopDownContext does not return Result for require_task due to the trade-offs discussed in the section on TopDownContext. If you want, you can capture more build events and write them, and/or provide more configuration as to what build events should be written. But in this tutorial, we will keep it simple like this. Check that the code compiles with cargo test. Let's try out our writing tracker in the incrementality example by modifying pie/examples/incremental.rs: We remove the println! statements from tasks and create Pie with WritingTracker. Now run the example with cargo run --example incremental, and you should see the writing tracker print consistent tasks and task executions to standard output.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Implement writing tracker","id":"52","title":"Implement writing tracker"},"53":{"body":"The writing tracker is great for debugging purposes, but we cannot use it to check whether our build system is incremental and sound. To check incrementality and soundness, we need to be able to check whether a task has executed or not, and check the order of build events. Therefore, we will implement the EventTracker that stores build events for later inspection. Add the event module to pie/src/tracker/mod.rs: Then create the pie/src/tracker/event.rs file and add: use std::path::{Path, PathBuf}; use crate::stamp::{FileStamp, FileStamper, OutputStamp, OutputStamper};\nuse crate::Task;\nuse crate::tracker::Tracker; /// [`Tracker`] that stores [events](Event) in a [`Vec`], useful in testing to assert that a context implementation is /// incremental and sound.\n#[derive(Clone, Debug)]\npub struct EventTracker<T: Task> { events: Vec<Event<T>>,\n} impl<T: Task> Default for EventTracker<T> { fn default() -> Self { Self { events: Vec::new() } }\n} /// Enumeration of important build events.\n#[derive(Debug, Clone)]\npub enum Event<T: Task> { /// A file at `path` has been required, using `stamper` to create `stamp`. RequiredFile { path: PathBuf, stamper: FileStamper, stamp: FileStamp }, /// Require `task` using `stamper`. RequireTask { task: T, stamper: OutputStamper }, /// A `task` has been required, resulting in consistent `output`, using `stamper` to create `stamp`, and task /// `was_executed`. RequiredTask { task: T, output: T::Output, stamper: OutputStamper, stamp: OutputStamp<T::Output>, was_executed: bool }, /// Execute `task`. Execute { task: T }, /// A `task` has been executed, producing `output`. Executed { task: T, output: T::Output },\n} The EventTracker stores build events in a Vec. The Event enumeration mimics the Tracker methods, but has all arguments in owned form (for example task: T instead of task: &T) as we want to store these events. Add the tracker implementation to pie/src/tracker/event.rs: impl<T: Task> Tracker<T> for EventTracker<T> { fn build_start(&mut self) { self.events.clear(); } fn required_file(&mut self, path: &Path, stamper: &FileStamper, stamp: &FileStamp) { self.events.push(Event::RequiredFile { path: path.to_path_buf(), stamper: *stamper, stamp: *stamp }); } fn require_task(&mut self, task: &T, stamper: &OutputStamper) { self.events.push(Event::RequireTask { task: task.clone(), stamper: stamper.clone() }); } fn required_task(&mut self, task: &T, output: &T::Output, stamper: &OutputStamper, stamp: &OutputStamp<T::Output>, was_executed: bool) { self.events.push(Event::RequiredTask { task: task.clone(), output: output.clone(), stamper: *stamper, stamp: stamp.clone(), was_executed }); } fn execute(&mut self, task: &T) { self.events.push(Event::Execute { task: task.clone() }); } fn executed(&mut self, task: &T, output: &T::Output) { self.events.push(Event::Executed { task: task.clone(), output: output.clone() }); }\n} We implement the relevant methods from Tracker and store the build events as Event instances in self.events. When a new build starts, we clear the events. Now we will add code to inspect the build events. This is quite a bit of code that we will be using in integration testing to test incrementality and soundness. We'll add in one go to keep the tutorial going, and we will use this code in the next section, but feel free to take some time to inspect the code. Add the following code to pie/src/tracker/event.rs: impl<T: Task> EventTracker<T> { /// Returns a slice over all events. pub fn slice(&self) -> &[Event<T>] { &self.events } /// Returns an iterator over all events. pub fn iter(&self) -> impl Iterator<Item=&Event<T>> { self.events.iter() } /// Returns `true` if `predicate` returns `true` for any event. pub fn any(&self, predicate: impl FnMut(&Event<T>) -> bool) -> bool { self.iter().any(predicate) } /// Returns the number of times `predicate` returns `true`. pub fn count(&self, predicate: impl FnMut(&&Event<T>) -> bool) -> usize { self.iter().filter(predicate).count() } /// Returns `true` if `predicate` returns `true` for exactly one event. pub fn one(&self, predicate: impl FnMut(&&Event<T>) -> bool) -> bool { self.count(predicate) == 1 } /// Returns `Some(index)` for the first event `e` where `predicate(e)` returns `true`, or `None` otherwise. pub fn index_of(&self, predicate: impl FnMut(&Event<T>) -> bool) -> Option<usize> { self.iter().position(predicate) } /// Returns `Some(v)` for the first event `e` where `f(e)` returns `Some(v)`, or `None` otherwise. pub fn find_map<R>(&self, f: impl FnMut(&Event<T>) -> Option<&R>) -> Option<&R> { self.iter().find_map(f) } /// Returns `Some((index, v))` for the first event `e` where `f(e)` returns `Some(v)`, or `None` otherwise. pub fn index_find_map<R>(&self, mut f: impl FnMut(&Event<T>) -> Option<&R>) -> Option<(usize, &R)> { self.iter().enumerate().find_map(|(i, e)| f(e).map(|o| (i, o))) } /// Finds the first [required file event](Event::RequiredFile) for `path` and returns its stamp as `Some(stamp)`, or /// `None` if no event was found. pub fn stamp_of_first_required_file(&self, path: &PathBuf) -> Option<&FileStamp> { self.find_map(|e| e.stamp_of_required_file(path)) } /// Returns `true` if any task was executed. pub fn any_execution(&self) -> bool { self.any(|e| e.is_execution()) } /// Returns `true` if `task` was executed. pub fn any_execution_of(&self, task: &T) -> bool { self.any(|e| e.is_execution_of(task)) } /// Returns `true` if `task` was executed exactly once. pub fn one_execute_of(&self, task: &T) -> bool { self.one(|e| e.is_execute(task)) } /// Finds the first [task execute event](Event::Execute) for `task` and returns its index as `Some(index)`, or `None` /// if no event was found. pub fn index_of_first_execute(&self, task: &T) -> Option<usize> { self.index_of(|e| e.is_execute(task)) } /// Finds the first [task executed event](Event::Executed) for `task` and returns its index as `Some(index)`, or /// `None` if no event was found. pub fn index_of_first_executed(&self, task: &T) -> Option<usize> { self.index_of(|e| e.output_of_executed(task).is_some()) } /// Finds the first [task executed event](Event::Executed) for `task` and returns its index and output as /// `Some((index, output))`, or `None` if no event was found. pub fn index_output_of_first_executed(&self, task: &T) -> Option<(usize, &T::Output)> { self.index_find_map(|e| e.output_of_executed(task)) }\n} impl<T: Task> Event<T> { /// Returns `Some(stamp)` if this is a [required file event](Event::RequiredFile) for file at `path`, or `None` /// otherwise. pub fn stamp_of_required_file(&self, path: &PathBuf) -> Option<&FileStamp> { match self { Event::RequiredFile { path: p, stamp, .. } if p == path => Some(stamp), _ => None, } } /// Returns `true` if this is a task execution (execute or executed) event. pub fn is_execution(&self) -> bool { match self { Event::Execute { .. } => true, Event::Executed { .. } => true, _ => false, } } /// Returns `true` if this is an execution (execute or executed) event for `task`. pub fn is_execution_of(&self, task: &T) -> bool { match self { Event::Execute { task: t } if t == task => true, Event::Executed { task: t, .. } if t == task => true, _ => false, } } /// Returns `true` if this is a [task execute event](Event::Execute) for `task`. pub fn is_execute(&self, task: &T) -> bool { match self { Event::Execute { task: t } if t == task => true, _ => false, } } /// Returns `Some(output)` if this is a [task executed event](Event::Executed) for `task`, or `None` otherwise. pub fn output_of_executed(&self, task: &T) -> Option<&T::Output> { match self { Event::Executed { task: t, output: o } if t == task => Some(o), _ => None, } }\n} We add several general inspection methods to EventTracker: slice and iter provide raw access to all stored Events, any, count, and one are for checking predicates over all events, index_of for finding the index of the first event given a predicate, find_map and index_find_map for finding the first event given some function, returning the output (and also index in index_find_map) of that function. We add methods for specific kinds of events, following the general methods. Finally, we add convenience methods to Event for checking specific kinds of events. Check that the code compiles with cargo test.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Implement event tracker","id":"53","title":"Implement event tracker"},"54":{"body":"Currently, we cannot use both EventTracker and WritingTracker at the same time. We want this so that we can check incrementality and soundness, but also look at standard output for debugging, at the same time. Therefore, we will implement a CompositeTracker that forwards build events to 2 trackers. Add the following code to pie/src/tracker/mod.rs: /// [`Tracker`] that forwards build events to 2 trackers.\n#[derive(Copy, Clone, Debug)]\npub struct CompositeTracker<A1, A2>(pub A1, pub A2);\nimpl<T: Task, A1: Tracker<T>, A2: Tracker<T>> Tracker<T> for CompositeTracker<A1, A2> { fn build_start(&mut self) { self.0.build_start(); self.1.build_start(); } fn build_end(&mut self) { self.0.build_end(); self.1.build_end(); } fn required_file(&mut self, path: &Path, stamper: &FileStamper, stamp: &FileStamp) { self.0.required_file(path, stamper, stamp); self.1.required_file(path, stamper, stamp); } fn require_task(&mut self, task: &T, stamper: &OutputStamper) { self.0.require_task(task, stamper); self.1.require_task(task, stamper); } fn required_task(&mut self, task: &T, output: &T::Output, stamper: &OutputStamper, stamp: &OutputStamp<T::Output>, was_executed: bool) { self.0.required_task(task, output, stamper, stamp, was_executed); self.1.required_task(task, output, stamper, stamp, was_executed); } fn execute(&mut self, task: &T) { self.0.execute(task); self.1.execute(task); } fn executed(&mut self, task: &T, output: &T::Output) { self.0.executed(task, output); self.1.executed(task, output); }\n} CompositeTracker is a tuple struct containing 2 trackers that implements all tracker methods and forwards them to the 2 contained trackers. Its tuple fields are pub so it can be constructed with CompositeTracker(t1, t2) and the contained trackers can be accessed with c.0 and c.1. Check that the code compiles with cargo test. Now that the build event tracking infrastructure is in place, we can start integration testing! Download source code You can download the source files up to this point .","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Implement composite tracker","id":"54","title":"Implement composite tracker"},"6":{"body":"Add the following test to pie/src/context/non_incremental.rs: #[cfg(test)]\nmod test { use super::*; #[test] fn test_require_task_direct() { #[derive(Clone, PartialEq, Eq, Hash, Debug)] struct ReturnHelloWorld; impl Task for ReturnHelloWorld { type Output = String; fn execute<C: Context<Self>>(&self, _context: &mut C) -> Self::Output { \"Hello World!\".to_string() } } let mut context = NonIncrementalContext; assert_eq!(\"Hello World!\", context.require_task(&ReturnHelloWorld)); }\n} In this test, we create a struct ReturnHelloWorld which is the \"hello world\" of the build system. We implement Task for it, set its Output associated type to be String, and implement the execute method to just return \"Hello World!\". We derive the Clone, Eq, Hash, and Debug traits for ReturnHelloWorld as they are required for all Task implementations. We require the task with our context by creating a NonIncrementalContext, calling its require_task method, passing in a reference to the task. It returns the output of the task, which we test with assert_eq!. Run the test by running cargo test. The output should look something like: Compiling pie v0.1.0 (/pie) Finished test [unoptimized + debuginfo] target(s) in 0.47s Running unittests src/lib.rs (/pie/target/debug/deps/pie-6c9d55a7ef727e00) running 1 test\ntest context::non_incremental::test::test_require_task_direct ... ok test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Doc-tests pie running 0 tests test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Which indicates that the test indeed succeeds! You can experiment by returning a different string from ReturnHelloWorld::execute to see what a failed test looks like. Rust Help Unit tests for a module are typically defined by creating a nested module named test with the #[cfg(test)] attribute applied to it. In that test module, you apply #[test] to testing functions, which then get executed when you run cargo test. The #[cfg(...)] attribute provides conditional compilation for the item it is applied to. In this case, #[cfg(test)] ensures that the module is only compiled when we run cargo test. We import all definitions from the parent module (i.e., the non_incremental module) into the test module with use super::*;. In Rust, items — that is, functions, structs, implementations, etc. — can be nested inside functions. We use that in test_require_task_direct to scope ReturnHelloWorld and its implementation to the test function, so it can't clash with other test functions. In execute, we use _context as the parameter name for the context, as the parameter is unused. Unused parameters give a warning in Rust, unless it is prefixed by a _. assert_eq! is a macro that checks if its two expressions are equal. If not, it panics . This macro is typically used in tests for assertions, as a panic marks a test as failed.","breadcrumbs":"Programmability » Non-Incremental Context » Simple Test","id":"6","title":"Simple Test"},"7":{"body":"Our first test only tests a single task that does not use the context, so let's write a test with two tasks where one requires the other to increase our test coverage. Add the following test: We use the same ReturnHelloWorld task as before, but now also have a ToLowerCase task which requires ReturnHelloWorld and then turn its string lowercase. However, due to the way we've set up the types between Task and Context, we will run into a problem. Running cargo test, you should get these errors: Compiling pie v0.1.0 (/pie)\nerror[E0308]: mismatched types --> src/context/non_incremental.rs:46:30 |\n46 | context.require_task(&ReturnHelloWorld).to_lowercase() | ------------ ^^^^^^^^^^^^^^^^^ expected `&ToLowerCase`, found `&ReturnHelloWorld` | | | arguments to this method are incorrect | = note: expected reference `&ToLowerCase` found reference `&non_incremental::test::test_require_task_problematic::ReturnHelloWorld`\nnote: method defined here --> src/lib.rs:18:6 |\n18 | fn require_task(&mut self, task: &T) -> T::Output; | ^^^^^^^^^^^^ For more information about this error, try `rustc --explain E0308`.\nerror: could not compile `pie` (lib test) due to previous error The problem is that execute of ToLowerCase takes a Context<Self>, so in impl Task for ToLowerCase it takes a Context<ToLowerCase>, while we're trying to require &ReturnHelloWorld through the context. This doesn't work as Context<ToLowerCase>::require_task only takes a &ToLowerCase as input. We could change execute of ToLowerCase to take Context<ReturnHelloWorld>: But that is not allowed: Compiling pie v0.1.0 (/pie)\nerror[E0276]: impl has stricter requirements than trait --> src/context/non_incremental.rs:45:21 |\n45 | fn execute<C: Context<ReturnHelloWorld>>(&self, context: &mut C) -> Self::Output { | ^^^^^^^^^^^^^^^^^^^^^^^^^ impl has extra requirement `C: Context<non_incremental::test::test_require_task_problematic::ReturnHelloWorld>` | ::: src/lib.rs:11:3 |\n11 | fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output; | --------------------------------------------------------------------- definition of `execute` from trait For more information about this error, try `rustc --explain E0276`.\nerror: could not compile `pie` (lib test) due to previous error This is because the Task trait defines execute to take a Context<Self>, thus every implementation of Task must adhere to this, so we can't solve it this way. Effectively, due to the way we defined Task and Context, we can only use a single task implementation . However, there is a good reason for this which will become more apparent once we implement incrementality. Why only a single Task type? The gist of it is that an incremental context wants to build a single dependency graph and cache task outputs, so that we can figure out from the graph whether a task is affected by a change, and just return its output if it is not affected. Therefore, a context implementation will maintain a Store<T>. A Context<ReturnHelloWorld> and Context<ToLowerCase> would then have a Store<ReturnHelloWorld> and Store<ToLowerCase> respectively. These two stores would then maintain two different dependency graphs, one where the nodes in the graph are ReturnHelloWorld and one where the nodes are ToLowerCase. But that won't work, as we need a single dependency graph over all tasks to figure out what is affected. There are several solutions to this problem. For example, we could use trait objects . However, this introduces a whole slew of problems because many traits that we use are not trait-object safe. Clone is not object safe because it requires Sized. Eq is not object safe because it uses Self. Serializing trait-objects is problematic. There are workarounds for all these things, but it is not pretty and very complicated. Another solution would be to encapsulate different tasks into a single type, using (procedural) macros to automatically generate this single task type. This solution is more feasible, but still introduces a lot of complexity which is not worth it in this tutorial. Therefore, in this tutorial we will keep it simple. For now, we will solve this by just using a single task type which is an enumeration of the different possible tasks. Replace the test with the following: Here, we instead define a single task Test which is an enum with two variants. In its Task implementation, we match ourselves and return \"Hello World!\" when the variant is ReturnHelloWorld. When the variant is ReturnHelloWorld, we require &Self::ReturnHelloWorld through the context, which is now valid because it is an instance of Test, and turn its string lowercase and return that. This now works due to only having a single task type. Run the test with cargo test to confirm it is working. Rust Help Enums define a type by a set of variants, similar to enums in other languages, sometimes called tagged unions in other languages. The match expression matches the variant and dispatches based on that, similar to switch statements in other languages. We have defined the API for the build system and implemented a non-incremental version of it. We're now ready to start implementing an incremental context in the next chapter. Download source code You can download the source files up to this point .","breadcrumbs":"Programmability » Non-Incremental Context » Test with Multiple Tasks","id":"7","title":"Test with Multiple Tasks"},"8":{"body":"In this chapter, we will implement an incremental build context. An incremental context selectively executes tasks — only those that are affected by a change. In other words, an incremental context executes the minimum number of tasks required to make all tasks up-to-date. However, due to dynamic dependencies, this is not trivial. We cannot first gather all tasks into a dependency tree and then topologically sort that, as dependencies are added and removed while tasks are executing . To do incremental builds in the presence of dynamic dependencies, we need to check and execute affected tasks one at a time, updating the dependency graph, while tasks are executing . To achieve this, we will employ a technique called top-down incremental building , where we start checking if a top (root) task needs to be executed, and recursively check whether dependent tasks should be executed until we reach the bottom (leaf) task(s), akin to a depth-first search. Furthermore, build systems almost always interact with the file system in some way. For example, tasks read configuration and source files, or write intermediate and binary files. Thus, a change in a file can affect a task that reads it, and executing a task can result in writing to new or existing files. Therefore, we will also keep track of file dependencies . Like task dependencies, file dependencies are also tracked dynamically while tasks are executing. There are several ways to check if a file dependency is consistent (i.e., has not changed), such as checking the last modification date, or comparing a hash. To make this configurable on a per-dependency basis, we will implement stamps . A file stamp is just a value that is produced from a file, such as the modification date or hash, that is stored with the file dependency. To check if a file dependency is consistent, we just stamp the file again and compare it with the stored stamp. Similarly, we can employ stamps for task dependencies as well by stamping the output of a task. To achieve incrementality, we will continue with these steps in the following sections: Extend Context with a method to require a file , enabling tasks to specify dynamic dependencies to files. Implement file stamps and task output stamps , and extend Context with methods to select stampers , enabling tasks to specify when a dependency is consistent. Implement dynamic dependencies and their consistency checking . Implement a dependency graph store with methods to query and mutate the dependency graph. Implement the top-down incremental context that incrementally executes tasks.","breadcrumbs":"Incrementality » Introduction","id":"8","title":"Introduction"},"9":{"body":"Since build systems frequently interact with files, and changes to files can affect tasks, we need to keep track of file dependencies. Therefore, we will extend the Context API with methods to require files , enabling tasks to specify dynamic dependencies to files. Add a method to the Context trait in pie/src/lib.rs: require_file is similar to requiring a task, but instead takes a path to a file or directory on the filesystem as input. We use AsRef<Path> as the type for the path, so that we can pass anything in that can dereference to a path. For example, str has an AsRef<Path> implementation, so we can just use \"test.txt\" as a path. As an output, we return Result<Option<File>, io::Error>, with File being a handle to an open file. The reason for this complicated type is: An incremental context will want to read the metadata (such as the last modified date) of the file, or create a hash over the file, to be able to detect changes. Because getting metadata or reading the file can fail, and we want to propagate this error, we return a Result with io::Error as the error type. Tasks can create a dependency to a file that does not exist, and the existence of that file affects the task. For example, a task that prints true or false based on if a file exists. If the file does not exist (or it is a directory), we cannot open it, so we cannot return a File, hence we use Option<File> to return None. Otherwise, we return Ok(Some(file)) so that the task can read the opened file. Rust Help Recoverable error handling in Rust is done with the Result<T, E> type, which can either be Ok(t) or Err(e). In contrast to many languages which use exceptions, throwing, and exception handling; Rust treats recoverable errors just as regular values. Similarly, optional values in Rust are defined using the Option<T> type, which can either be Some(t) or None. Rust has many traits for converting values or references into others, which provides a lot of convenience in what would otherwise require a lot of explicit conversions. AsRef<T> is such a conversion trait, that can convert itself into &T. Here, we use AsRef<Path> as a generic with a trait bound to support many different kinds of values to the path argument in require_file. For example, we can call context.require_file(\"test.txt\") because str, which is the type of string constants, implements AsRef<Path> . You can also see this as a kind of method overloading, without having to provide concrete overloads for all supported types. Now we need to implement this method for NonIncrementalContext. However, because we will be performing similar file system operations in the incremental context as well, we will create some utility functions for this first. Add the fs module to pie/src/lib.rs: Create file pie/src/fs.rs with: use std::{fs, io};\nuse std::fs::{File, Metadata};\nuse std::path::Path; /// Gets the metadata for given `path`, returning:\n/// - `Ok(Some(metadata))` if a file or directory exists at given path,\n/// - `Ok(None)` if no file or directory exists at given path,\n/// - `Err(e)` if there was an error getting the metadata for given path.\npub fn metadata(path: impl AsRef<Path>) -> Result<Option<Metadata>, io::Error> { match fs::metadata(path) { Err(e) if e.kind() == io::ErrorKind::NotFound => Ok(None), Err(e) => Err(e), Ok(m) => Ok(Some(m)) }\n} /// Attempt to open file at given `path`, returning:\n/// - `Ok(Some(file))` if the file exists at given path, /// - `Ok(None)` if no file exists at given path (but a directory could exist at given path),\n/// - `Err(e)` if there was an error getting the metadata for given path, or if there was an error opening the file.\n///\n/// This function is necessary due to Windows returning an error when attempting to open a directory.\npub fn open_if_file(path: impl AsRef<Path>) -> Result<Option<File>, io::Error> { let file = match metadata(&path)? { Some(metadata) if metadata.is_file() => Some(File::open(&path)?), _ => None, }; Ok(file)\n} The metadata function gets the filesystem metadata given a path, and open_if_file opens the file for given path. The reason for these functions is that the standard library function std::fs::metadata treats non-existent files as an error, whereas we don't want to treat it as an error and just return None. Furthermore, open_if_file works around an issue where opening a directory on Windows (and possibly other operating systems) is an error, where we want to treat it as None again. The documentation comments explain the exact behaviour. Rust Help The ? operator makes it easy to propgate errors . Because errors are just values in Rust, to propgate an error, you'd normally have to match each result and manually propagate the error. The r? operator applied to a Result r does this for you, it basically desugars to something like match r { Err(e) => return Err(e), _ => {} }. Comments with three forward slashes /// are documentation comments that document the function/struct/enum/trait/etc. they are applied to. We will write some tests to confirm the behaviour, but for that we need utilities to create temporary files and directories. Furthermore, we will be writing more unit tests, integration tests, and even benchmarks in this tutorial, so we will set up these utilities in such a way that they are reachable by all these use cases. The only way to do that in Rust right now, is to create a separate crate and have the pie crate depend on it. And yes, we went from adding file dependencies, to creating file system utilities, to testing those file system utilities, to creating testing utilities, and now to making a crate for those testing utilities. Sorry about that 😅, we will start unwinding this stack soon! Next to the pie directory, create a directory named dev_shared. Create the dev_shared/Cargo.toml file with the following contents: [package]\nname = \"dev_shared\"\nversion = \"0.1.0\"\nedition = \"2021\" [dependencies]\ntempfile = \"3\" We've added the tempfile dependency here already, which is a crate that creates and automatically cleans up temporary files and directories. Rust Help We use other libraries (crates) by specifying dependencies . Because basically every Rust library adheres to semantic versioning , we can use \"3\" as a version requirement which indicates that we will use the most up-to-date 3.x.x version. Create the main library file dev_shared/src/lib.rs, with functions for creating temporary files and directories: use std::io; use tempfile::{NamedTempFile, TempDir}; /// Creates a new temporary file that gets cleaned up when dropped.\npub fn create_temp_file() -> Result<NamedTempFile, io::Error> { NamedTempFile::new() } /// Creates a new temporary directory that gets cleaned up when dropped.\npub fn create_temp_dir() -> Result<TempDir, io::Error> { TempDir::new() } Your directory structure should now look like this: ├── pie\n│ ├── src\n│ │ ├── lib.rs\n│ │ ├── context\n│ │ │ ├── mod.rs\n│ │ │ └── non_incremental.rs\n│ │ └── fs.rs\n│ ├── Cargo.toml\n│ ├── Cargo.lock\n│ └── target\n└── dev_shared ├── src │ └── lib.rs └── Cargo.toml To access these utility functions in the pie crate, add a dependency to dev_shared in pie/Cargo.toml along with another create that will help testing: We've also added the assert_matches crate, which is a handy library for asserting that a value matches a pattern. Note that these dependencies are added under dev-dependencies, indicating that these dependencies are only available when running tests, benchmarks, and examples. Therefore, users of our library will not depend on these crates, which is good, because temporary file management and assertions are not necessary to users of the library. Back to testing our filesystem utilities. Add the following tests to pie/src/fs.rs: #[cfg(test)]\nmod test { use std::fs::remove_file; use std::io; use assert_matches::assert_matches; use dev_shared::{create_temp_dir, create_temp_file}; use super::*; #[test] fn test_metadata_ok() -> Result<(), io::Error> { let temp_file = create_temp_file()?; let metadata = metadata(temp_file)?; assert_matches!(metadata, Some(metadata) => { assert!(metadata.is_file()); }); Ok(()) } #[test] fn test_metadata_none() -> Result<(), io::Error> { let temp_file = create_temp_file()?; remove_file(&temp_file)?; let metadata = metadata(&temp_file)?; assert!(metadata.is_none()); Ok(()) } #[test] fn test_open_if_file() -> Result<(), io::Error> { let temp_file = create_temp_file()?; let file = open_if_file(&temp_file)?; assert!(file.is_some()); Ok(()) } #[test] fn test_open_if_file_non_existent() -> Result<(), io::Error> { let temp_file = create_temp_file()?; remove_file(&temp_file)?; let file = open_if_file(&temp_file)?; assert!(file.is_none()); Ok(()) } #[test] fn test_open_if_file_on_directory() -> Result<(), io::Error> { let temp_dir = create_temp_dir()?; let file = open_if_file(temp_dir)?; assert!(file.is_none()); Ok(()) }\n} We test whether the functions conform to the specified behaviour. Unfortunately, we can't easily test when metadata and open_if_file should return an error, because we cannot disable read permissions on files via the Rust standard library. We use our create_temp_file and create_temp_dir utility functions to create temporary files and directories. The tempfile library takes care of deleting temporary files when they go out of scope (at the end of the test). We use assert_matches! to assert that metadata is Some(metadata), binding metadata in the => { ... } block in which we assert that the metadata describes a file. We will use this macro more in future integration tests. Rust Help Tests can return Result . When a test returns an Err, the test fails. This allows us to write more concise tests using error propagation. Now we are done unwinding our stack and have filesystem and testing utilities. Make the non-incremental context compatible by changing pie/src/context/non_incremental.rs: Since the non-incremental context does not track anything, we only try to open the file and return it, matching the contract in the documentation comment of the Context::require_file trait method. Confirm everything works with cargo test. 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construction This page was quickly created to make setup possible, but is unfinished. Make sure Rust is installed . We start by creating a new Rust crate. Create the pie directory and create the pie/Cargo.toml file with the following contents: [package]\nname = \"pie\"\nversion = \"0.1.0\"\nedition = \"2021\" Then create the pie/src directory and create the pie/src/lib.rs file, which will be left empty for now. Run cargo build to test if the project was set up correctly. The output should look something like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.12s Download source code You can download the source files up to this point .","breadcrumbs":"Programmability » Setup » Setup","id":"0","title":"Setup"},"1":{"body":"In this section, we will program the core API of the programmatic incremental build system. The unit of computation in a programmatic build system is a task . A task is kind of like a closure: a value that can be executed to produce their output. However, in an incremental programmatic build system, we also need to keep track of dynamic dependencies that are made while tasks are executing. Therefore, tasks are executed under a build context which enable them to create these dependencies. Tasks require other tasks through the context, creating a dynamic dependency and returning their up-to-date output. On the other hand, an incremental build context wants to selectively execute tasks — only those that are affected by a change. To that end, a build context will selectively execute tasks, tasks require other tasks through the build context, the build context selectively executes those, and so forth. Thus, tasks and build contexts are mutually recursive. Note In this tutorial, we will be using the words context , build context , and build system interchangeably, typically using just context as it is concise. Let's make tasks and contexts more concrete by defining them in code.","breadcrumbs":"Programmability » Programmable Build System API » Programmable Build System API","id":"1","title":"Programmable Build System API"},"10":{"body":"To check whether we need to execute a task, we need to check the dependencies of that task to see if any of them are inconsistent. To make this consistency checking configurable, we will use stamps. A dependency is inconsistent if after stamping, the new stamp is different from the old stamp. Therefore, we will implement a FileStamper that stamps files and produces a FileStamp, and an OutputStamper that stamps task outputs and produces an OutputStamp. Add the stamp module to pie/src/lib.rs: This module is public as users of the library will construct stampers.","breadcrumbs":"Incrementality » Stamps » Stamps","id":"10","title":"Stamps"},"11":{"body":"Create the pie/src/stamp.rs file and add: use std::fmt::Debug;\nuse std::io;\nuse std::path::Path;\nuse std::time::SystemTime; use crate::fs::metadata; #[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\npub enum FileStamper { Exists, Modified,\n} impl FileStamper { pub fn stamp(&self, path: impl AsRef<Path>) -> Result<FileStamp, io::Error> { match self { FileStamper::Exists => { Ok(FileStamp::Exists(path.as_ref().try_exists()?)) } FileStamper::Modified => { let Some(metadata) = metadata(path)? else { return Ok(FileStamp::Modified(None)); }; Ok(FileStamp::Modified(Some(metadata.modified()?))) } } }\n} #[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\npub enum FileStamp { Exists(bool), Modified(Option<SystemTime>),\n} We're implementing FileStamper as an enum for simplicity. A FileStamper has a single method stamp which takes something that can be dereferenced to a path, and produces a FileStamp or an error if creating the stamp failed. For now, we implement only two kinds of file stampers: Exists and Modified. The Exists stamper just returns a boolean indicating whether a file exists. It can be used to create a file dependency where a task behaves differently based on whether a file exists or not. The Modified stamper returns the last modification date if the file exists, or None if the file does not exist. We derive Eq for stamps so that we can compare them. Equal (same) stamps indicate a consistent dependency, unequal (different) indicates inconsistent. We also derive Eq for stampers, because the stamper of a dependency could change, making the dependency inconsistent.","breadcrumbs":"Incrementality » Stamps » File stamps","id":"11","title":"File stamps"},"12":{"body":"We implement task output stampers in a similar way. Add to pie/src/stamp.rs: #[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\npub enum OutputStamper { Inconsequential, Equals,\n} impl OutputStamper { pub fn stamp<O>(&self, output: O) -> OutputStamp<O> { match self { OutputStamper::Inconsequential => OutputStamp::Inconsequential, OutputStamper::Equals => OutputStamp::Equals(output), } }\n} #[derive(Clone, Eq, PartialEq, Debug)]\npub enum OutputStamp<O> { Inconsequential, Equals(O),\n} impl<O> OutputStamp<O> { pub fn as_ref(&self) -> OutputStamp<&O> { match self { OutputStamp::Inconsequential => OutputStamp::Inconsequential, OutputStamp::Equals(o) => OutputStamp::Equals(o), } }\n} The Inconsequential stamper simply ignores the output and always returns the same stamp (thus is always equal). It can be used to create a task dependency where we are interested in some side effect of a task, but don't care about its output. The Equals stamper simply wraps the output of a task, so the stamp is equal when the output is equal. Output stamps are generic over the task output type O. Trait bounds and derive macros Because O is used in the enum, the derive attributes on OutputStamp create bounds over O. Thus, OutputStamp is only Clone when O is Clone, OutputStamp is only Eq when O is Eq, and so forth. Because we declared Task::Output with bound Clone + Eq + Debug, we can be sure that OutputStamp is always Clone, Eq, and Debug. User-defined stamps FileStamper and OutputStamper could also be a trait which would allow users of the library to implement their own stampers. For simplicity, we do not explore that option in this tutorial. If you feel adventurous, you could try to implement this after you've finished the tutorial. Do note that this introduces a lot of extra generics and trait bounds everywhere, which can be a bit cumbersome.","breadcrumbs":"Incrementality » Stamps » Task output stamps","id":"12","title":"Task output stamps"},"13":{"body":"Finally, we write some tests. Add to pie/src/stamp.rs: #[cfg(test)]\nmod test { use std::fs::{remove_file, write}; use std::io; use dev_shared::create_temp_file; use super::*; #[test] fn test_exists_file_stamper() -> Result<(), io::Error> { let stamper = FileStamper::Exists; let temp_file = create_temp_file()?; let stamp = stamper.stamp(&temp_file)?; assert_eq!(stamp, stamper.stamp(&temp_file)?); remove_file(&temp_file)?; assert_ne!(stamp, stamper.stamp(&temp_file)?); Ok(()) } #[test] fn test_modified_file_stamper() -> Result<(), io::Error> { let stamper = FileStamper::Modified; let temp_file = create_temp_file()?; let stamp = stamper.stamp(&temp_file)?; assert_eq!(stamp, stamper.stamp(&temp_file)?); write(&temp_file, format!(\"{:?}\", stamp))?; let new_stamp = stamper.stamp(&temp_file)?; assert_ne!(stamp, new_stamp); let stamp = new_stamp; remove_file(&temp_file)?; assert_ne!(stamp, stamper.stamp(&temp_file)?); Ok(()) } #[test] fn test_inconsequential_output_stamper() { let stamper = OutputStamper::Inconsequential; let stamp = stamper.stamp(&1); assert_eq!(stamp, stamper.stamp(&1)); assert_eq!(stamp, stamper.stamp(&2)); } #[test] fn test_equals_output_stamper() { let stamper = OutputStamper::Equals; let stamp = stamper.stamp(&1); assert_eq!(stamp, stamper.stamp(&1)); assert_ne!(stamp, stamper.stamp(&2)); }\n} We test file stamps by creating a stamp, changing the file, creating a new stamp, and then compare the stamps. We test task output stamps by just passing a different output value to the stamp function, and then compare the stamps. Run cargo test to confirm the stamp implementation. If test test_modified_file_stamper fails, do continue to the next section, because we're going to fix it!","breadcrumbs":"Incrementality » Stamps » Tests","id":"13","title":"Tests"},"14":{"body":"Unfortunately, these tests may fail on some operating systems (Linux and Windows in my testing), due to an imprecise file last modified timer. What can happen is that we write to a file, making the OS update its modified time to 1000 (as an example, not a real timestamp), then very quickly write to the file again, making the OS update its modified time to 1000 again. Then, our test will fail because the stamp didn't change even though we expect it to change. This can happen with an imprecise timer that only increases once every millisecond (again, an example, not a real number) when we perform writes in between that millisecond. Even worse, our test can be flaky, sometimes succeeding if we write in between those milliseconds, sometimes failing if we write within a millisecond. To solve this, add a function to the filesystem testing utility crate. Change dev_shared/src/lib.rs: The write_until_modified function writes to the file, but ensures its modified time will change. Now change the tests in pie/src/stamp.rs to use this function: Now we use write_until_modified to write to the file, ensuring its modified time will change, ensuring the stamp will change when it should. Run cargo test to confirm the stamp implementation, which should succeed now.","breadcrumbs":"Incrementality » Stamps » Testing with file modified time, correctly","id":"14","title":"Testing with file modified time, correctly"},"15":{"body":"We now have a module dedicated to stamps. However, stampers are constructed by users of the library that author tasks, and they need to pass in these stampers when creating dependencies. Therefore, we need to update the Context trait to allow passing in these stampers. Change Context in pie/src/lib.rs: We add the require_file_with_stamper method which allow passing in a stamper. We add a default implementation for require_file that passes in a default stamper. The default is provided by default_require_file_stamper which can be overridden by context implementations. Now apply the same to tasks, changing Context again in pie/src/lib.rs: Update NonIncrementalContext in src/context/non_incremental.rs to implement the new methods: We just ignore the stampers in NonIncrementalContext, as they are only needed for incrementality. Run cargo test to confirm everything still works. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Stamps » Stamps in Context","id":"15","title":"Stamps in Context"},"16":{"body":"Now that we've implemented stamps, we can implement dynamic dependencies and their consistency checking. A dependency is inconsistent if after stamping, the new stamp is different from the old stamp. Therefore, dependencies need to keep track of their stamper and their previous stamp. To that end, we will implement the FileDependency and TaskDependency types with methods for consistency checking. We will also implement a Dependency type that abstracts over FileDependency and TaskDependency, which we will need for the dependency graph implementation in the next chapter. Add the dependency module to pie/src/lib.rs: This module is private, as users of the library should not construct dependencies. They should only create dependencies (and choose stampers) via Context methods.","breadcrumbs":"Incrementality » Dynamic Dependencies » Dynamic Dependencies","id":"16","title":"Dynamic Dependencies"},"17":{"body":"Create the pie/src/dependency.rs file and add: use std::fmt::Debug;\nuse std::fs::File;\nuse std::io;\nuse std::path::PathBuf; use crate::{Context, Task};\nuse crate::fs::open_if_file;\nuse crate::stamp::{FileStamp, FileStamper, OutputStamp, OutputStamper}; #[derive(Clone, Eq, PartialEq, Debug)]\npub struct FileDependency { path: PathBuf, stamper: FileStamper, stamp: FileStamp,\n} impl FileDependency { /// Creates a new file dependency with `path` and `stamper`, returning: /// - `Ok(file_dependency)` normally, /// - `Err(e)` if stamping failed. #[allow(dead_code)] pub fn new(path: impl Into<PathBuf>, stamper: FileStamper) -> Result<Self, io::Error> { let path = path.into(); let stamp = stamper.stamp(&path)?; let dependency = FileDependency { path, stamper, stamp }; Ok(dependency) } /// Creates a new file dependency with `path` and `stamper`, returning: /// - `Ok((file_dependency, Some(file)))` if a file exists at given path, /// - `Ok((file_dependency, None))` if no file exists at given path (but a directory could exist at given path), /// - `Err(e)` if stamping or opening the file failed. pub fn new_with_file(path: impl Into<PathBuf>, stamper: FileStamper) -> Result<(Self, Option<File>), io::Error> { let path = path.into(); let stamp = stamper.stamp(&path)?; let file = open_if_file(&path)?; let dependency = FileDependency { path, stamper, stamp }; Ok((dependency, file)) } /// Returns the path of this dependency. #[allow(dead_code)] pub fn path(&self) -> &PathBuf { &self.path } /// Returns the stamper of this dependency. #[allow(dead_code)] pub fn stamper(&self) -> &FileStamper { &self.stamper } /// Returns the stamp of this dependency. #[allow(dead_code)] pub fn stamp(&self) -> &FileStamp { &self.stamp } /// Checks whether this file dependency is inconsistent, returning: /// - `Ok(Some(stamp))` if this dependency is inconsistent (with `stamp` being the new stamp of the dependency), /// - `Ok(None)` if this dependency is consistent, /// - `Err(e)` if there was an error checking this dependency for consistency. pub fn is_inconsistent(&self) -> Result<Option<FileStamp>, io::Error> { let new_stamp = self.stamper.stamp(&self.path)?; if new_stamp == self.stamp { Ok(None) } else { Ok(Some(new_stamp)) } }\n} A FileDependency stores the path the dependency is about, the stamper used to create a stamp for this dependency, and the stamp that was created at the time the file dependency was made. The FileDependency::new_with_file function also returns the opened file if it exists, so that users of this function can read from the file without having to open it again. We add getter methods to get parts of the file dependency without allowing mutation. Since we will use those getter methods later, we annotate them with #[allow(dead_code)] to disable unused warnings. A file dependency is inconsistent when the stored stamp is not equal to a stamp that we create at the time of checking, implemented in FileDependency::is_inconsistent. For example, if we created a file dependency (with modified stamper) for a file that was modified yesterday, then modify the file, and then call is_inconsistent on the file dependency, it would return Some(new_stamp) indicating that the dependency is inconsistent. We implement an is_inconsistent method here instead of an is_consistent method, so that we can return the changed stamp when the dependency is inconsistent, which we will use for debug logging purposes later. Creating and checking a file dependency can fail due to file operations failing (for example, cannot access the file), so we propagate those errors.","breadcrumbs":"Incrementality » Dynamic Dependencies » File dependencies","id":"17","title":"File dependencies"},"18":{"body":"Task dependencies are implemented in a similar way. Add to pie/src/dependency.rs: #[derive(Clone, Eq, PartialEq, Debug)]\npub struct TaskDependency<T, O> { task: T, stamper: OutputStamper, stamp: OutputStamp<O>,\n} impl<T: Task> TaskDependency<T, T::Output> { /// Creates a new `task` dependency with `stamper` and `output`. pub fn new(task: T, stamper: OutputStamper, output: T::Output) -> Self { let stamp = stamper.stamp(output); Self { task, stamper, stamp } } /// Returns the task of this dependency. #[allow(dead_code)] pub fn task(&self) -> &T { &self.task } /// Returns the stamper of this dependency. #[allow(dead_code)] pub fn stamper(&self) -> &OutputStamper { &self.stamper } /// Returns the stamp of this dependency. #[allow(dead_code)] pub fn stamp(&self) -> &OutputStamp<T::Output> { &self.stamp } /// Checks whether this task dependency is inconsistent, returning: /// - `Some(stamp)` if this dependency is inconsistent (with `stamp` being the new stamp of the dependency), /// - `None` if this dependency is consistent. pub fn is_inconsistent<C: Context<T>>(&self, context: &mut C) -> Option<OutputStamp<T::Output>> { let output = context.require_task(&self.task); let new_stamp = self.stamper.stamp(output); if new_stamp == self.stamp { None } else { Some(new_stamp) } }\n} A TaskDependency stores the task the dependency is about, along with its stamper and stamp that is created when the dependency is created. Task dependencies are generic over the type of tasks T, and their type of outputs O. We also add immutable getters here. Trait bounds on structs We chose not to put a Task trait bound on TaskDependency, and instead put the bound on the impl. There are several up and downsides that should be considered when making such a decision. The main upside for putting the Task bound on the TaskDependency struct, is that we can leave out O and use OutputStamp<T::Output> as the type of the stamp field. This cuts down a generic parameter, which reduces boilerplate. The downside is that we need to then put the Task bound on every struct that uses TaskDependency, which increases boilerplate. In this case, we chose not to put the trait bound on the struct to prevent that trait bound from bubbling up into other structs that use TaskDependency, as it would need to appear in almost every struct in the library. A task dependency is inconsistent if, after recursively checking it, its stamp has changed, implemented in TaskDependency::is_inconsistent. Usually, this will be using the Equals task output stamper, so a task dependency is usually inconsistent when the output of the task changes. Because we need to recursively check the task, TaskDependency::is_inconsistent requires a context to be passed in. Again, there is more mutual recursion here. This recursive consistency checking is one of the core ideas that make programmatic incremental build systems possible. But why is this so important? Why do we need recursive checking? Well, we want our build system to be sound , meaning that we must execute all tasks that are affected by a change. When we do not execute a task that is affected by a change , we are unsound , and introduce an incrementality bug ! Because of dynamic dependencies, a change in a leaf in the dependency tree may affect a task at the root. For example, a compilation task depends on a task that reads a configuration file, which depends on the configuration file. A change to a configuration file (leaf) affects a task that reads the configuration file, which in turn affects the compilation task (root). Therefore, we need to recursively check the dependency tree in order to execute all tasks affected by changes. A different way to think about this, is to think about the invariant of the dependency consistency checking. The invariant is that a dependency is consistent if and only if the subtree of that dependency is consistent, and the dependency itself is consistent. The easiest way to adhere to this invariant, is recursive checking. A final note about recursive checking is that tasks can be executed during it, and executing task can lead to new dynamic dependencies. However, recursive checking handles this without problems because these dependencies are created through the Context, which in turn will call is_inconsistent when needed.","breadcrumbs":"Incrementality » Dynamic Dependencies » Task dependencies","id":"18","title":"Task dependencies"},"19":{"body":"Finally, we create a Dependency enum that abstracts over these two kinds of dependencies. Add to pie/src/dependency.rs: #[derive(Clone, Eq, PartialEq, Debug)]\npub enum Dependency<T, O> { RequireFile(FileDependency), RequireTask(TaskDependency<T, O>),\n} #[derive(Clone, Eq, PartialEq, Debug)]\npub enum InconsistentDependency<O> { File(FileStamp), Task(OutputStamp<O>),\n} impl<T: Task> Dependency<T, T::Output> { /// Checks whether this dependency is inconsistent, returning: /// - `Ok(Some(stamp))` if the dependency is inconsistent (with `stamp` being the new stamp of the dependency), /// - `Ok(None)` if the dependency is consistent, /// - `Err(e)` if there was an error checking the dependency for consistency. pub fn is_inconsistent<C: Context<T>>(&self, context: &mut C) -> Result<Option<InconsistentDependency<T::Output>>, io::Error> { let option = match self { Dependency::RequireFile(d) => d.is_inconsistent()? .map(|s| InconsistentDependency::File(s)), Dependency::RequireTask(d) => d.is_inconsistent(context) .map(|s| InconsistentDependency::Task(s)), }; Ok(option) }\n} Dependency just merges the two kinds of dependencies and provides an is_inconsistent method that calls the corresponding method. We return the changed stamp here as well for debug logging later. We wrap the changed stamp in an InconsistentDependency enum, and map to the correct variant if there is an inconsistency. Because Dependency can store a TaskDependency, we need to propagate the T and O generics. Likewise, InconsistentDependency propagates the O generic for OutputStamp. User-defined dependencies Like with stampers, Dependency could also be a trait to allow users of the library to define their own dependencies. However, as we will see later, these dynamic dependencies also require validation, and I am unsure how such a Dependency trait should look. Therefore, we don't have an appendix on how to implement this. But, if you have an idea on how to this nicely (after you've completed this tutorial), please get in touch!","breadcrumbs":"Incrementality » Dynamic Dependencies » Dependency enum","id":"19","title":"Dependency enum"},"2":{"body":"Since we want users of the build system to implement their own tasks, we will define Task as a trait. Likewise, we will also be implementing multiple contexts in this tutorial, so we will also define Context as a trait. Add the following code to your pie/src/lib.rs file: use std::fmt::Debug;\nuse std::hash::Hash; /// A unit of computation in a programmatic incremental build system.\npub trait Task: Clone + Eq + Hash + Debug { /// Type of output this task returns when executed. type Output: Clone + Eq + Debug; /// Execute the task, using `context` to specify dynamic dependencies, returning `Self::Output`. fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output;\n} /// Programmatic incremental build context, enabling tasks to create dynamic dependencies that context implementations /// use for incremental execution.\npub trait Context<T: Task> { /// Requires given `task`, recording a dependency and selectively executing it. Returns its up-to-date output. fn require_task(&mut self, task: &T) -> T::Output;\n} Note If this seems overwhelming to you, don't worry. We will go through the API and explain things. But more importantly, the API should become more clear once we implement it in the next section and subsequent chapters. Furthermore, if you're new to Rust and/or need help understanding certain concepts, I will try to explain them in Rust Help blocks. They are collapsed by default to reduce distraction, clicking the header opens them. See the first Rust Help block at the end of this section. The Task trait has several supertraits that we will need later in the tutorial to implement incrementality: Eq and Hash: to check whether a task is equal to another one, and to create a hash of it, so we can use a HashMap to get the output of a task if it is up-to-date. Clone: to create a clone of the task so that we can store it in the HashMap without having ownership of it. Debug: to format the task for debugging purposes. A Task has a single method execute, which takes a reference to itself (&self), and a mutable reference to a context (context: &mut C), and produces a value of type Self::Output. Because Context is a trait, we use generics (<C: Context<Self>>) to have execute work for any Context implementation (ignoring the Self part for now). The execute method takes self by reference such that a task can access its data, but not mutate it, as that could throw off incrementality by changing the hash/equality of the task. Finally, the type of output of a task is defined by the Output associated type, and this type must implement Clone, Eq, and Debug for the same reason as Task. The Context trait is generic over Task, allowing it to work with any task implementation. It has a single method require_task for creating a dependency to a task and returning its up-to-date result. It takes a mutable reference to itself, enabling dependency tracking and caching, which require mutation. Because of this, the context reference passed to Task::execute is also mutable. This Task and Context API mirrors the mutually recursive definition of task and context we discussed earlier, and forms the basis for the entire build system. Build the project by running cargo build. The output should look something like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.06s Rust Help The Rust Programming Language is an introductory book about Rust. I will try to provide links to the book where possible. Rust has a module system for project organization. The lib.rs file is the \"main file\" of a library. Later on, we will be creating more modules in different files. Things are imported into the current scope with use statements. We import the Debug and Hash traits from the standard library with two use statements. Use statements use paths to refer to nested things. We use :: for nesting, similar to namespaces in C++. Rust models the concept of ownership to enable memory safety without a garbage collector. The execute method accepts a reference to the current type, indicated with &: &self. This reference is immutable , meaning that we can read data from it, but not mutate it. In Rust, things are immutable by default. On the other hand, execute accepts a mutable reference to the context, indicated with &mut: context: &mut C, which does allow mutation. Traits are the main mechanism for open extensibility in Rust. They are comparable to interfaces in class-oriented languages. We will implement a context and tasks in the next section. Supertraits are a kind of inheritance. The : Clone + Eq + Hash + Debug part of the Task trait means that every Task implementation must also implement the Clone, Eq, Hash, and Debug traits. These traits are part of the standard library: Clone for duplicating values. Eq for equality comparisons, along with PartialEq . Hash for turning a value into a hash. Debug for formatting values in a programmer-facing debugging context. Clone and Eq are so common that they are part of the Rust Prelude , so we don't have to import those with use statements. Methods are functions that take a form of self as the first argument. This enables convenient object-like calling syntax: context.require_task(&task);. Associated types are a kind of placeholder type in a trait such that methods of traits can use that type. In Task this allows us to talk about the Output type of a task. In Context this allows us to refer to both the Task type T and its output type T::Output. The :: syntax here is used to access associated types of traits. The Self type in a trait is a built-in associated type that is a placeholder for the type that is implementing the trait. The Task trait is defined with pub (public) visibility , such that users of the library can implement it. Because Task uses Context in its public API, Context must also be public, even though we don't intend for users to implement their own Context. Download source code You can download the source files up to this point .","breadcrumbs":"Programmability » Programmable Build System API » API Implementation","id":"2","title":"API Implementation"},"20":{"body":"As usual, we write some tests to confirm the behaviour. Add tests to pie/src/dependency.rs: #[cfg(test)]\nmod test { use std::fs::write; use std::io::{self, Read}; use dev_shared::{create_temp_file, write_until_modified}; use crate::context::non_incremental::NonIncrementalContext; use super::*; /// Task that reads file at given path and returns it contents as a string. #[derive(Clone, PartialEq, Eq, Hash, Debug)] struct ReadStringFromFile(PathBuf); impl Task for ReadStringFromFile { type Output = String; fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output { let mut string = String::new(); let file = context.require_file(&self.0).expect(\"failed to require file\"); if let Some(mut file) = file { file.read_to_string(&mut string).expect(\"failed to read from file\"); }; string } } #[test] fn test_file_dependency_consistency() -> Result<(), io::Error> { let mut context = NonIncrementalContext; let temp_file = create_temp_file()?; write(&temp_file, \"test1\")?; let file_dependency = FileDependency::new(temp_file.path(), FileStamper::Modified)?; let dependency: Dependency<ReadStringFromFile, String> = Dependency::RequireFile(file_dependency.clone()); assert!(file_dependency.is_inconsistent()?.is_none()); assert!(dependency.is_inconsistent(&mut context)?.is_none()); // Change the file, changing the stamp the stamper will create next time, making the file dependency inconsistent. write_until_modified(&temp_file, \"test2\")?; assert!(file_dependency.is_inconsistent()?.is_some()); assert!(dependency.is_inconsistent(&mut context)?.is_some()); Ok(()) } #[test] fn test_task_dependency_consistency() -> Result<(), io::Error> { let mut context = NonIncrementalContext; let temp_file = create_temp_file()?; write(&temp_file, \"test1\")?; let task = ReadStringFromFile(temp_file.path().to_path_buf()); let output = context.require_task(&task); let task_dependency = TaskDependency::new(task.clone(), OutputStamper::Equals, output); let dependency = Dependency::RequireTask(task_dependency.clone()); assert!(task_dependency.is_inconsistent(&mut context).is_none()); assert!(dependency.is_inconsistent(&mut context)?.is_none()); // Change the file, causing the task to return a different output, changing the stamp the stamper will create next // time, making the task dependency inconsistent. write_until_modified(&temp_file, \"test2\")?; assert!(task_dependency.is_inconsistent(&mut context).is_some()); assert!(dependency.is_inconsistent(&mut context)?.is_some()); Ok(()) }\n} We test a file dependency by asserting that is_inconsistent returns Some after changing the file. Testing task dependencies requires a bit more work. We create task ReadStringFromFile that reads a string from a file, and then returns that string as output. We require the task to get its output (\"test1\"), and create a task dependency with it. Then, we change the file and check consistency of the task dependency. That recursively requires the task, the context will execute the task, and the task now returns (\"test2\"). Since we use the Equals output stamper, and \"test1\" does not equal \"test2\", the dependency is inconsistent and returns a stamp containing \"test2\". Note that we are both testing the specific dependencies (FileDependency and TaskDependency), and the general Dependency. Note Normally, a task such as ReadStringFromFile shound return a Result<String, io::Error>, but for testing purposes we are just using panics with expect. In the file dependency case, using Dependency requires an explicit type annotation because there is no task to infer the type from. We just use Dependency<ReadStringFromFile, String> as the type, and this is fine even though we don't use ReadStringFromFile in that test, because the Dependency::RequireFile variant does not use those types. Run cargo test to confirm everything still works. You will get some warnings about unused things, but that is ok as we will use them in the next section. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Dynamic Dependencies » Tests","id":"20","title":"Tests"},"21":{"body":"To do incremental building, we need to keep track of all files, tasks, their dependencies, and task outputs, in a dependency graph. This will be the responsibility of the Store data structure. Context implementations will use methods on Store to query and mutate the dependency graph. In other words, Store encapsulates the dependency graph. However, writing a dependency graph data structure is outside of the scope of this tutorial, so we will be using the pie_graph library which we prepared exactly for this use case. The graph from this library is a directed acyclic graph (DAG), meaning that edges are directed and there may be no cycles in edges, as that would prohibit topological orderings. Graph library The pie_graph library is a modified version of the great incremental-topo library which implements incremental topological ordering: it keeps the topological ordering up-to-date incrementally while nodes and edges are added and removed. That is exactly what we need, as dynamic dependencies prevents us from calculating the topological ordering in one go, and calculating the topological ordering after every task execution is prohibitively expensive. The implementation in the incremental-topo library is based on a paper by D. J. Pearce and P. H. J. Kelly that describes several dynamic topological sort algorithms for directed acyclic graphs. Add the pie_graph dependency to pie/Cargo.toml:","breadcrumbs":"Incrementality » Dependency Graph Store » Dependency Graph Store","id":"21","title":"Dependency Graph Store"},"22":{"body":"Add the store module to pie/src/lib.rs: This module is private, as users of the library should not interact with the store. Only Context implementations will use the store. Create the pie/src/store.rs file and add the following to get started: use std::path::{Path, PathBuf}; use pie_graph::{DAG, Node}; use crate::dependency::{Dependency, FileDependency, TaskDependency};\nuse crate::Task; /// Stores files and tasks, and their dependencies, in a DAG (directed acyclic graph). Provides operations to mutate\n/// and query this graph.\npub struct Store<T, O> { graph: DAG<NodeData<T, O>, Dependency<T, O>>,\n} #[derive(Debug)]\nenum NodeData<T, O> { File(PathBuf), Task { task: T, output: Option<O>, },\n} impl<T: Task> Default for Store<T, T::Output> { fn default() -> Self { Self { graph: DAG::default(), } }\n} The Store is generic over tasks T and their outputs O, like we have done before with Dependency. The DAG type from pie_graph represents a DAG with nodes and edges, and data attached to those nodes and edges. The nodes in our graph are either files or tasks, and the edges are dependencies. The first generic argument to DAG is the type of data to attach to nodes, which is NodeData<T, O> in our case. Because nodes can be files or tasks, NodeData<T, O> enumerates these, storing the path for files, and the task along with its output for tasks. We store file paths as PathBuf, which is the owned version of Path (similar to String being the owned version of str). The task output is stored as Option<O> because we can add a task to the graph without having executed it, so we don't have its output yet. The second argument is the type of data to attach to edges, which is Dependency<T, O>, using the Dependency enum we defined earlier. We implement Default for the store to initialize it. Deriving default We cannot derive this Default implementation even though it seems we should be able to, because the derived implementation will require T and O to be Default, and this is not always the case. This is because the Default derive macro is conservative and adds a : Default bound to every generic argument in the Default trait implementation, and there is no way to disable this behaviour. Therefore, we implement Default ourselves. There are several crates that have more configurable derive macros for these things, but adding an extra dependency to generate a few lines of code is not worth the extra compilation time, so we just implement it manually here.","breadcrumbs":"Incrementality » Dependency Graph Store » Store basics","id":"22","title":"Store basics"},"23":{"body":"A node in DAG is represented by a Node, which is a transparent identifier (sometimes called a handle ) that points to the node and its data. We can create nodes in the graph, and then query attached data (NodeData) given a node. So DAG allows us to go from Node to a PathBuf and task T through attached NodeData. However, we want each unique file and task to be represented by a single unique node in the graph. We need this for incrementality so that if the build system encounters the same task twice, we can find the corresponding task node in the graph the second time, check if it is consistent, and return its output if it is. To ensure unique nodes, we need to maintain the reverse mapping from PathBuf and T to Node ourselves, which we will do with HashMaps. This is also the reason for the Eq and Hash trait bounds on the Task trait, so we can use them as keys in HashMaps. Change pie/src/store.rs to add hash maps to map between these things: To prevent accidentally using a file node as a task node, and vice versa, change pie/src/store.rs to add specific types of nodes: The FileNode and TaskNode types are newtypes that wrap a Node into a specific type of node. The Borrow implementations will make subsequent code a bit more concise by automatically converting &FileNode and &TaskNodes to &Nodes. Newtypes Because the Nodes inside the newtypes are not public, it is not possible to construct a FileNode or TaskNode outside of this module. Therefore, if we only accept and create FileNode and TaskNode in the Store API, it is not possible to use the wrong kind of node. The Borrow implementation does leak outside of this module, but not outside of this crate (library). This is because the visibility of a trait implementation is the intersection of the visibilities of the trait and type it is implemented on. Borrow is public, but FileNode and TaskNode are only public within this crate. Thefore, modules of this crate can extract the Node out of FileNode and TaskNode. However, that Node cannot be used to construct a FileNode or TaskNode, so it is not a problem. Now we will add methods create nodes and to query their attached data. Add the following code to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Gets the file node for `path`, or creates a file node by adding it to the dependency graph. pub fn get_or_create_file_node(&mut self, path: impl AsRef<Path>) -> FileNode { let path = path.as_ref(); if let Some(file_node) = self.file_to_node.get(path) { *file_node } else { let node = self.graph.add_node(NodeData::File(path.to_path_buf())); let node = FileNode(node); self.file_to_node.insert(path.to_path_buf(), node); node } } /// Gets the path for `node`. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph. #[allow(dead_code)] pub fn get_file_path(&self, node: &FileNode) -> &PathBuf { let Some(NodeData::File(path)) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; path } /// Gets the task node for `task`, or creates a task node by adding it to the dependency graph. pub fn get_or_create_task_node(&mut self, task: &T) -> TaskNode { if let Some(node) = self.task_to_node.get(task) { *node } else { let node = self.graph.add_node(NodeData::Task { task: task.clone(), output: None, }); let node = TaskNode(node); self.task_to_node.insert(task.clone(), node); node } } /// Gets the task for `node`. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph. pub fn get_task(&self, node: &TaskNode) -> &T { let Some(NodeData::Task { task, .. }) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; task }\n} The get_or_create_file_node method creates file nodes. When we want to go from a file path (using impl AsRef<Path>) to a FileNode, either we have already added this file path to the graph and want to get the FileNode for it, or we have not yet added it to the graph yet and should add it. The former is handled by the if branch in get_or_create_file_node, where we just retrieve the FileNode from the file_to_node hash map. The latter is handled by the else branch where we add the node to the graph with graph.add_node which attaches the NodeData::File data to the node, and then returns a FileNode which we insert into the file_to_node map. The get_file_path method does the inverse. We get the attached data given a node, and extract the file path from it. Note that we are using panic! here to indicate that invalid usage of this method is an unrecoverable programming error that should not occur. Returning an Option<&PathBuf> makes no sense here, as the caller of this method has no way to recover from this. Because this is not an end-user-facing API (store module is private), we control all the calls to this method, and thus we are responsible for using these methods in a valid way. Therefore, when we call these methods, we should document why it is valid (if this is not immediately obvious), and we need to test whether we really use it in a valid way. We're also documenting the panics in a # Panics section in the documentation comment, as is common practice in Rust. Triggering these panics Because only Store can create FileNodes and TaskNodes, and all methods only take these values as inputs, these panics will not happen under normal usage. The only way to trigger these panics (in safe Rust) would be to create two stores, and use the nodes from one store in another. However, since this is a private module, we just need to make sure that we don't do that. There are some tricks to prevent even this kind of invalid usage. For example, the generativity crate generates unique identifiers based on lifetimes. However, that is a bit overkill, especially for an internal API, so we won't be using that. We implement similar methods for task nodes in get_or_create_task_node and get_task.","breadcrumbs":"Incrementality » Dependency Graph Store » Graph nodes","id":"23","title":"Graph nodes"},"24":{"body":"When we do not need to execute a task because it is consistent, we still need to return its output. Therefore, we store the task output in NodeData::Task and add methods to query and manipulate task outputs. Add the following code to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Checks whether task `node` has an output. Returns `false` if `node` does not have an output. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph. pub fn task_has_output(&self, node: &TaskNode) -> bool { let Some(NodeData::Task { output, .. }) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; output.is_some() } /// Gets the output for task `node`. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph, or if the task has no output. pub fn get_task_output(&self, node: &TaskNode) -> &T::Output { let Some(NodeData::Task { output: Some(output), .. }) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph, or does not have an output\", node); }; output } /// Sets the output for task `node` to `new_output`. /// /// # Panics /// /// Panics if task `node` was not found in the dependency graph. pub fn set_task_output(&mut self, node: &TaskNode, new_output: T::Output) { let Some(NodeData::Task { output, .. }) = self.graph.get_node_data_mut(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; output.replace(new_output); }\n} The task_has_output, get_task_output, and set_task_output methods manipulate task outputs in NodeData::Task. Again, we are using panics here to indicate unrecoverable programming errors.","breadcrumbs":"Incrementality » Dependency Graph Store » Task outputs","id":"24","title":"Task outputs"},"25":{"body":"Now we need methods to query and manipulate dependencies. The edges in the graph are dependencies between tasks and files. Tasks can depend on other tasks and files, but there are no dependencies between files. An edge does not have its own dedicated representation, and is simply represented by two nodes: the source node and the destination node of the edge. Add the following code to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Get all dependencies of task `src`. /// /// # Panics /// /// Panics in development builds if `src` was not found in the dependency graph. pub fn get_dependencies_of_task<'a>(&'a self, src: &'a TaskNode) -> impl Iterator<Item=&'a Dependency<T, T::Output>> + 'a { debug_assert!(self.graph.contains_node(src), \"BUG: node {:?} was not found in the dependency graph\", src); self.graph.get_outgoing_edge_data(src) } /// Add a file require `dependency` from task `src` to file `dst`. /// /// # Panics /// /// Panics if `src` or `dst` were not found in the dependency graph, or if a cycle is created by adding this dependency. pub fn add_file_require_dependency(&mut self, src: &TaskNode, dst: &FileNode, dependency: FileDependency) { match self.graph.add_edge(src, dst, Dependency::RequireFile(dependency)) { Err(pie_graph::Error::NodeMissing) => panic!(\"BUG: source node {:?} or destination node {:?} was not found in the dependency graph\", src, dst), Err(pie_graph::Error::CycleDetected) => panic!(\"BUG: cycle detected when adding file dependency from {:?} to {:?}\", src, dst), _ => {}, } } /// Adds a task require `dependency` from task `src` to task `dst`. /// /// # Errors /// /// Returns `Err(())` if adding this dependency to the graph creates a cycle. /// /// # Panics /// /// Panics if `src` or `dst` were not found in the dependency graph. pub fn add_task_require_dependency(&mut self, src: &TaskNode, dst: &TaskNode, dependency: TaskDependency<T, T::Output>) -> Result<(), ()> { match self.graph.add_edge(src, dst, Dependency::RequireTask(dependency)) { Err(pie_graph::Error::NodeMissing) => panic!(\"BUG: source node {:?} or destination node {:?} was not found in the dependency graph\", src, dst), Err(pie_graph::Error::CycleDetected) => Err(()), _ => Ok(()), } }\n} The get_dependencies_of_task method gets the dependencies (edge data of outgoing edges) of a task, and returns it as an iterator (which is empty if task has no dependencies). This method needs explicit lifetime annotations due to the signature of get_outgoing_edge_data and the way we return an iterator using impl Iterator<.... We're using debug_assert! here to trigger a panic indicating an unrecoverable programming error only in development mode, because this check is too expensive to run in release (optimized) mode. The add_file_require_dependency method adds a file dependency. Adding an edge to the graph can result in cycles, which are not allowed in a directed acyclic graph (DAG). Therefore, graph.add_edge can return an Err indicating that there is a cycle. In case of files, this cannot happen because files do not have outgoing dependencies, and the API enforces this by never taking a FileNode as a source (src) of an edge. Tasks can depend on other tasks, so they can create cycles. In add_task_require_dependency, we propagate the cycle detected error (by returning Err(())) to the caller because the caller has more information to create an error message for the user that made a cyclic task dependency.","breadcrumbs":"Incrementality » Dependency Graph Store » Dependencies","id":"25","title":"Dependencies"},"26":{"body":"Finally, when we determine that a task is inconsistent and needs to be executed, we first need to remove its output and remove its outgoing dependencies, as those will interfere with incrementality when not removed. We do NOT want to remove incoming dependencies, as that would remove dependencies from other tasks to this task, which breaks incrementality, so we can't just remove and re-add the task to the graph. Add the reset_task method that does this to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Reset task `src`, removing its output and removing all its outgoing dependencies. /// /// # Panics /// /// Panics if task `src` was not found in the dependency graph. pub fn reset_task(&mut self, src: &TaskNode) { if let Some(NodeData::Task { output, .. }) = self.graph.get_node_data_mut(src) { *output = None; } else { panic!(\"BUG: node {:?} was not found in the dependency graph\", src); } self.graph.remove_outgoing_edges_of_node(src); }\n} This will reset the task output back to None, and remove all outgoing edges (dependencies).","breadcrumbs":"Incrementality » Dependency Graph Store » Resetting tasks","id":"26","title":"Resetting tasks"},"27":{"body":"Now we've implemented everything we need for implementing the top-down context, but first we will write some tests.","breadcrumbs":"Incrementality » Dependency Graph Store » Tests","id":"27","title":"Tests"},"28":{"body":"Add the following code to pie/src/store.rs for testing the file mapping: #[cfg(test)]\nmod test { use crate::Context; use crate::stamp::{FileStamper, OutputStamper}; use super::*; /// Task that returns its owned string. Never executed, just used for testing the store. #[derive(Clone, PartialEq, Eq, Hash, Debug)] struct StringConstant(String); impl StringConstant { pub fn new(string: impl Into<String>) -> Self { Self(string.into()) } } impl Task for StringConstant { type Output = String; fn execute<C: Context<Self>>(&self, _context: &mut C) -> Self::Output { self.0.clone() } } #[test] fn test_file_mapping() { let mut store: Store<StringConstant, String> = Store::default(); let path_a = PathBuf::from(\"hello.txt\"); let node_a = store.get_or_create_file_node(&path_a); assert_eq!(node_a, store.get_or_create_file_node(&path_a)); // Same node assert_eq!(&path_a, store.get_file_path(&node_a)); // Same file path let path_b = PathBuf::from(\"world.txt\"); let node_b = store.get_or_create_file_node(&path_b); assert_eq!(node_b, store.get_or_create_file_node(&path_b)); assert_eq!(&path_b, store.get_file_path(&node_b)); assert_ne!(node_a, node_b); // Different nodes } #[test] #[should_panic] fn test_file_mapping_panics() { let mut fake_store: Store<StringConstant, String> = Store::default(); let fake_node = fake_store.get_or_create_file_node(\"hello.txt\"); let store: Store<StringConstant, String> = Store::default(); store.get_file_path(&fake_node); }\n} We create a simple task StringConstant because we need a Task implementation to test Store, as Store is generic over a Task type. We will never execute it because Store does not execute tasks. Test test_file_mapping checks whether the file node mapping works as expected: get_or_create_file_node calls with the same path should produce the same FileNode. get_or_create_file_node calls with different paths should produce different FileNodes. This works because \"hello.txt\" and \"world.txt\" are different paths, thus their Eq and Hash implementations ensure they get separate spots in the file_to_node hash map. Test test_file_mapping_panics triggers the panic in get_file_path by creating a FileNode with a \"fake store\", and then using that rogue file node in another store. While it is unlikely that we will make this mistake when using Store, it is good to confirm that this panics. Rust help The #[should_panic] attribute makes the test succeed if it panics, and fail if it does not panic.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing file mapping","id":"28","title":"Testing file mapping"},"29":{"body":"Test the task mapping by inserting the following code into the test module (before the last }): #[test] fn test_task_mapping() { let mut store = Store::default(); let task_a = StringConstant::new(\"Hello\"); let node_a = store.get_or_create_task_node(&task_a); assert_eq!(node_a, store.get_or_create_task_node(&task_a)); // Same node assert_eq!(&task_a, store.get_task(&node_a)); // Same task let task_b = StringConstant::new(\"World\"); let node_b = store.get_or_create_task_node(&task_b); assert_eq!(node_b, store.get_or_create_task_node(&task_b)); assert_eq!(&task_b, store.get_task(&node_b)); assert_ne!(node_a, node_b); // Different nodes } #[test] #[should_panic] fn test_task_mapping_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let store: Store<StringConstant, String> = Store::default(); store.get_task(&fake_node); } We test this in the same way as the file mapping. Again, this works because StringConstant(\"Hello\") and StringConstant(\"World\") are different due to their derived Eq and Hash implementations, which make them different due to the strings being different. Likewise, StringConstant::new(\"Hello\") and StringConstant::new(\"Hello\") are equal even if they are created with 2 separate invocations of new. These (in)equalities might seem quite obvious, but it is important to keep in mind because incrementality can only work if we can identify equal tasks at a later time, so that we can check their dependencies and return their cached output when those dependencies are consistent. Later on we will also see that this is important for soundness of the incremental build system.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing task mapping","id":"29","title":"Testing task mapping"},"3":{"body":"We set up the Task and Context API in such a way that we can implement incrementality. However, incrementality is hard , so let's start with an extremely simple non-incremental Context implementation to get a feeling for the API.","breadcrumbs":"Programmability » Non-Incremental Context » Non-Incremental Context","id":"3","title":"Non-Incremental Context"},"30":{"body":"Test task outputs by inserting the following code into the test module: #[test] fn test_task_outputs() { let mut store = Store::default(); let output_a = \"Hello\".to_string(); let task_a = StringConstant::new(&output_a); let node_a = store.get_or_create_task_node(&task_a); let output_b = \"World\".to_string(); let task_b = StringConstant::new(&output_b); let node_b = store.get_or_create_task_node(&task_b); // Assert that tasks have no output by default. assert!(!store.task_has_output(&node_a)); assert!(!store.task_has_output(&node_b)); // Set output for task A, assert that A has that output but B is unchanged. store.set_task_output(&node_a, output_a.clone()); assert!(store.task_has_output(&node_a)); assert_eq!(store.get_task_output(&node_a), &output_a); assert!(!store.task_has_output(&node_b)); // Set output for task B, assert that B has that output but A is unchanged. store.set_task_output(&node_b, output_b.clone()); assert!(store.task_has_output(&node_a)); assert_eq!(store.get_task_output(&node_a), &output_a); assert!(store.task_has_output(&node_b)); assert_eq!(store.get_task_output(&node_b), &output_b); } #[test] #[should_panic] fn test_task_has_output_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let store: Store<StringConstant, String> = Store::default(); store.task_has_output(&fake_node); } #[test] #[should_panic] fn test_get_task_output_panics() { let mut store = Store::default(); let node = store.get_or_create_task_node(&StringConstant::new(\"Hello\")); store.get_task_output(&node); } #[test] #[should_panic] fn test_set_task_output_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let mut store: Store<StringConstant, String> = Store::default(); store.set_task_output(&fake_node, \"Hello\".to_string()); } Test test_task_outputs ensures that: task_has_output only returns true if given task has an output, and that get_task_output returns the output set by set_task_output for given task. Test test_get_task_output_panics triggers a panic when we call get_task_output for a task that has no output, which is an invalid usage of Store that is more likely to happen than the other panics.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing task outputs","id":"30","title":"Testing task outputs"},"31":{"body":"Test dependencies by inserting the following code into the test module: #[test] fn test_dependencies() { let mut store = Store::default(); let output_a = \"Hello\".to_string(); let task_a = StringConstant::new(output_a.clone()); let node_a = store.get_or_create_task_node(&task_a); let output_b = \"World\".to_string(); let task_b = StringConstant::new(output_b.clone()); let node_b = store.get_or_create_task_node(&task_b); let path_c = PathBuf::from(\"hello.txt\"); let node_c = store.get_or_create_file_node(&path_c); assert_eq!(store.get_dependencies_of_task(&node_a).next(), None); assert_eq!(store.get_dependencies_of_task(&node_b).next(), None); // Add file dependency from task A to file C. let file_dependency_a2c = FileDependency::new(&path_c, FileStamper::Exists).unwrap(); store.add_file_require_dependency(&node_a, &node_c, file_dependency_a2c.clone()); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&node_a).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency_a2c.clone()))); assert_eq!(deps_of_a.get(1), None); assert_eq!(store.get_dependencies_of_task(&node_b).next(), None); // Add task dependency from task B to task A. let task_dependency_b2a = TaskDependency::new(task_a.clone(), OutputStamper::Equals, output_a.clone()); let result = store.add_task_require_dependency(&node_b, &node_a, task_dependency_b2a.clone()); assert_eq!(result, Ok(())); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&node_a).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency_a2c.clone()))); assert_eq!(deps_of_a.get(1), None); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&node_b).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireTask(task_dependency_b2a.clone()))); assert_eq!(deps_of_b.get(1), None); // Add file dependency from task B to file C. let file_dependency_b2c = FileDependency::new(&path_c, FileStamper::Exists).unwrap(); store.add_file_require_dependency(&node_b, &node_c, file_dependency_b2c.clone()); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&node_a).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency_a2c.clone()))); assert_eq!(deps_of_a.get(1), None); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&node_b).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireTask(task_dependency_b2a.clone()))); assert_eq!(deps_of_b.get(1), Some(&Dependency::RequireFile(file_dependency_b2c.clone()))); assert_eq!(deps_of_b.get(2), None); // Add task dependency from task A to task B, creating a cycle. let task_dependency_a2b = TaskDependency::new(task_a.clone(), OutputStamper::Equals, output_a.clone()); let result = store.add_task_require_dependency(&node_a, &node_b, task_dependency_a2b); assert_eq!(result, Err(())); // Creates a cycle: error } #[test] #[should_panic] fn test_get_dependencies_of_task_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let store: Store<StringConstant, String> = Store::default(); let _ = store.get_dependencies_of_task(&fake_node); } #[test] #[should_panic] fn test_add_file_require_dependency_panics() { let mut fake_store = Store::default(); let fake_file_node = fake_store.get_or_create_file_node(\"hello.txt\"); let fake_task_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let mut store: Store<StringConstant, String> = Store::default(); let dependency = FileDependency::new(\"hello.txt\", FileStamper::Exists).unwrap(); store.add_file_require_dependency(&fake_task_node, &fake_file_node, dependency); } #[test] #[should_panic] fn test_add_task_require_dependency_panics() { let mut fake_store = Store::default(); let output = \"Hello\".to_string(); let task = StringConstant::new(&output); let fake_task_node = fake_store.get_or_create_task_node(&task); let mut store: Store<StringConstant, String> = Store::default(); let dependency = TaskDependency::new(task, OutputStamper::Equals, output); let _ = store.add_task_require_dependency(&fake_task_node, &fake_task_node, dependency); } The test_dependencies test is a bit more involved because it ensures that: get_dependencies_of_task returns the dependencies of given task. If the task has no dependencies, the iterator is empty. We test if an iterator is empty by getting the first element of the iterator with .next() and assert that it is None. get_dependencies_of_task returns the dependencies of given task in the order in which they were added, which will be important for soundness later. The graph library returns dependencies in insertion order. add_task_require_dependency adds a dependency to the correct task. creating a cycle with add_task_require_dependency results in it returning Err(()). Note that the StringConstant task does not actually create file or task dependencies, but since Store never executes a task, we can pretend that it does in tests.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing dependencies","id":"31","title":"Testing dependencies"},"32":{"body":"Finally, test task reset by inserting the following code into the test module: #[test] fn test_reset() { let mut store = Store::default(); let output_a = \"Hello\".to_string(); let task_a = StringConstant::new(output_a.clone()); let task_a_node = store.get_or_create_task_node(&task_a); let output_b = \"World\".to_string(); let task_b = StringConstant::new(output_b.clone()); let task_b_node = store.get_or_create_task_node(&task_b); let path = PathBuf::from(\"hello.txt\"); let file_node = store.get_or_create_file_node(&path); // Set outputs for task A and B. store.set_task_output(&task_a_node, output_a.clone()); assert!(store.task_has_output(&task_a_node)); assert_eq!(store.get_task_output(&task_a_node), &output_a); store.set_task_output(&task_b_node, output_b.clone()); assert!(store.task_has_output(&task_b_node)); assert_eq!(store.get_task_output(&task_b_node), &output_b); // Add file dependency for task A and B. let file_dependency = FileDependency::new(&path, FileStamper::Exists).unwrap(); store.add_file_require_dependency(&task_a_node, &file_node, file_dependency.clone()); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&task_a_node).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency.clone()))); assert_eq!(deps_of_a.get(1), None); store.add_file_require_dependency(&task_b_node, &file_node, file_dependency.clone()); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&task_b_node).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireFile(file_dependency.clone()))); assert_eq!(deps_of_b.get(1), None); // Reset only task A. store.reset_task(&task_a_node); // Assert that task A is reset. assert!(!store.task_has_output(&task_a_node)); assert_eq!(store.get_dependencies_of_task(&task_a_node).next(), None); // Assert that task B is unchanged. assert!(store.task_has_output(&task_b_node)); assert_eq!(store.get_task_output(&task_b_node), &output_b); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&task_b_node).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireFile(file_dependency.clone()))); assert_eq!(deps_of_b.get(1), None); } #[test] #[should_panic] fn test_reset_task_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let mut store: Store<StringConstant, String> = Store::default(); store.reset_task(&fake_node); } Here, we ensure that a task with an output and dependencies, does not have an output and dependencies after a reset, while leaving another task untouched. Confirm that the store implementation works with cargo test. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Dependency Graph Store » Testing task reset","id":"32","title":"Testing task reset"},"33":{"body":"We've implemented all the prerequisites for incremental top-down building. Now we will create the TopDownContext type which implements the Context trait in an incremental way.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Top-down Context","id":"33","title":"Top-down Context"},"34":{"body":"Add the top_down module to pie/src/context/mod.rs: Create the pie/src/context/top_down.rs file and add the following to get started: use std::fs::File;\nuse std::io;\nuse std::path::Path; use crate::{Context, fs, Task};\nuse crate::dependency::{FileDependency, TaskDependency};\nuse crate::stamp::{FileStamper, OutputStamper};\nuse crate::store::{Store, TaskNode}; pub struct TopDownContext<T, O> { store: Store<T, O>,\n} impl<T: Task> TopDownContext<T, T::Output> { pub fn new() -> Self { Self { store: Store::default(), } }\n} impl<T: Task> Context<T> for TopDownContext<T, T::Output> { fn require_file_with_stamper<P: AsRef<Path>>(&mut self, path: P, stamper: FileStamper) -> Result<Option<File>, io::Error> { todo!() } fn require_task_with_stamper(&mut self, task: &T, stamper: OutputStamper) -> T::Output { todo!() }\n} The TopDownContext type is generic over tasks T and their outputs O, owns a Store, and can be created using new. TopDownContext implements Context, and the main challenge will be implementing the require_file_with_stamper and require_task_with_stamper methods incrementally and correctly .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Top-down context basics","id":"34","title":"Top-down context basics"},"35":{"body":"Tasks such as ReadStringFromFile which we've used in tests before call context.require_file to declare that they depend on a file in the filesystem. For incrementality, we need to add this dependency to the dependency graph. This dependency will go from the current executing task to the file. Therefore, we will need to keep track of the current executing task. Change pie/src/context/mod.rs to add a field for tracking the current executing task, and use it in require_file_with_stamper: We're not setting current_executing_task yet, as that is the responsibility of require_task_with_stamper which we will implement later. In require_file_with_stamper we're now getting the current executing task. If there is no current executing task, which only happens if a user directly calls require_file on a context, we don't make a dependency and just open the file. Now we need to add the file dependency, change pie/src/context/mod.rs to do this: We simply create or get an existing file node, create a file dependency, and add the file require dependency to the graph via store. Errors are propagated to the caller, so they can react accordingly to filesystem operation failures.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Requiring files","id":"35","title":"Requiring files"},"36":{"body":"To implement require_task_with_stamper, we need to check whether we should execute a task. A task should be executed either if it's new (it does not have an output stored yet), or if at least one of its dependencies is inconsistent. If we don't execute it, then it must have an output value and all its dependencies are consistent, so we just return its output value. Change pie/src/context/mod.rs to implement this logic: We first create or get an existing file node. Then, we check whether the task should be executed with should_execute_task which we still need to implement. If that returns true, we reset the task, set the current executing task, actually execute the task, restore the previous executing task, and set the task output. Otherwise, we get the output of the task from the store, which cannot panic because should_execute_task ensures that the task has an output if it returns false. Finally, we return the output. We still need to create a task dependency. Change pie/src/context/mod.rs to add the dependency: If there is no current executing task, which occurs when a user requires the initial task, we skip creating a dependency. Otherwise, we create a dependency and add it to the store. However, creating a task dependency can create cycles, and we need to handle that error. At this point, we need to make a hard decision about the API of our library. require_task_with_stamper returns the task output, with no opportunity to return an error. If we want to propagate this error, we'd need to change the Context::require_task API to return Result<T::Output, CycleError>. However, because tasks call these methods on Context, we'd also need to change Task::execute to return Result<T::Output, CycleError>. That would require all tasks to propagate these cycle errors every time they require another task. Furthermore, some tasks want to return their own kinds of errors, where T::Output will be Result<AnOutput, AnError>. In that case, the concrete return type would be Result<Result<AnOutput, AnError>, CycleError>, which is annoying to deal with. On the other hand, we can panic when a cycle is found, which requires no changes to the API. We do end up in a mostly unrecoverable state, so a panic is a valid option. However, this is not ideal, because it means the build system can panic due to invalid task dependencies created by the user of the system. Panics will (most of the time) stop the program, which can be annoying to deal with. This is a hard trade-off to make. Either we propagate errors which will not end the program but will introduce a lot of boilerplate and annoyance in task implementations. Or we panic which will end the program but introduces no boilerplate. In this tutorial, we will go with panics on cycles, because it results in a much simpler system. Recovering from panics Panics either abort the program (when panics are set to abort in Cargo.toml), or unwind the call stack and then end the program. When panics abort, there is nothing we can do about it. A panic will immediately abort the program. When panics unwind, the call stack is unwound, which still runs all destructors ( Drop ), and this unwinding can be caught. We can catch unwinding panics with catch_unwind , which is a way to recover from panics. This does require that the types used in the closure passed to catch_unwind are unwind safe . This is because panics exit a function early, which can mess up some invariants of your code. For example, a call to set a task output can be skipped when a panic occurs, breaking a code invariant. Therefore, types such as &mut T are not unwind safe by default, because these invariants can break under panics. Note that unwind safety is something different than the general safety guarantees provided by Rust: type-safe, memory-safe, thread-safe. An unwind unsafe type is still type-safe, memory-safe, and thread-safe. Unwind safety can be more easily achieved by using owned types which run destructors when the function call ends, which work under normal circumstances, but also when unwinding panics. In the context of the PIE build system, if we panic on unrecoverable errors, but want to allow catching these panics, we need to think about unwind safety. At any point we panic, we need to think about keeping the system in a valid state. Another way to recover from panics is to run the panicking code on a different thread. If the code panics, it will only end that thread, effectively allowing panic recovery. However, this does require some form of thread-safety, beause you are moving a computation to a different thread. Furthermore, some platforms do not have access to threads, such as WASM, where this approach would not work. A final note is that care must be taken when unwiding panics across foreign function interfaces (FFI) .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Requiring tasks","id":"36","title":"Requiring tasks"},"37":{"body":"The final piece to our puzzle is the should_execute_task implementation. Add the following code to pie/src/context/top_down.rs: The premise of should_execute_task is simple: go over the dependencies of a task until dependency.is_inconsistent is true, at which we return true. If all dependencies are consistent, then return true only if the task has no output. Otherwise, return false. However, there are some complications due to borrowing. Checking if a task dependency is inconsistent requires recursive checking: TaskDependency::is_inconsistent requires a &mut Context to call Context::require_task, which in turn can require this method again. To that end, we pass self to is_inconsistent, because self is an instance of TopDownContext which implements Context. In this method, self is &mut self, a mutable borrow. Therefore, we cannot have any other borrows active while is_inconsistent is being called, because that would violate one of the safety mechanisms of Rust where mutable borrows are exclusive . Getting the task's dependencies from the store requires a borrow, so we cannot hold onto that borrow. We get around that here by cloning the dependencies and collecting them into a Vec. We also document this fact in a comment to explain to readers (us in the future) why we do this cloning, preventing refactorings only to hit that same borrowing issue again. Cloning and collecting does have a performance overhead as we need to clone the dependencies and heap allocate a Vec to store them. For this tutorial, that is fine, but in a real-world application we should minimize cloning if possible and look into reducing heap allocations. Reference counting Cloning a Dependency results in heap allocations, because cloning FileDependency clones a PathBuf which is a heap allocated string (basically a Vec<u8>), and cloning a TaskDependency clones the Task, which may require allocations as well. One way to avoid heap allocations in both kinds of dependencies is to store the PathBuf and Task in a reference-counting pointer Rc . Then, there will only be one heap allocated PathBuf and Task, and cloning just increments the reference count. The upside is that this approach is easy to implement and reduces allocations. The downside is that clones require incrementing the reference count, which is a write operation that does have a tiny bit of overhead. In many cases, this overhead is smaller than cloning data when the data is large enough or requires heap allocations. In our case, it would probably be worth doing this, but benchmarking is required to confirm this. Note that instead of always wrapping tasks in a Rc, task authors could implement Task on Rc<TheirTask> instead. Since Rc implements Clone, any time we task.clone(), we would just increase the reference count instead. When working in a multi-threaded situation, you would use the thread-safe Arc instead. String optimizations A technique for reducing allocations on strings (and string-like types such as PathBuf) is to apply small string optimization , where small strings are stored inline instead of requiring a heap allocation. This only works if the strings are usually small enough to fit inline on the stack (for example, 32 bytes). Another technique for strings is string interning, where equal strings are stored in a central place and then re-used everywhere. This technique is great when we use the same string a lot of times. That may be a good strategy for a build system, where we work with the same file paths over and over. There are several crates implementing these techniques, but I have not used one myself yet, so I cannot recommend one. Avoiding heap allocations from collecting into Vecs Collecting the elements of an iterator into a Vec requires heap allocations as Vec is allocated on the heap. We can avoid or at least reduce the number of heap allocations by re-using the same Vec instead of creating a new one. Instead of collecting, you would store the Vec in the struct, clear it, and then extend it with the iterator. When you clear a Vec, it removes all the elements, but keeps the heap allocated space. Only if you would add more elements than it has space for, another heap allocation would be required, which will happen less and less frequently when you keep reusing the same Vec. The downside is that you are keeping this heap allocated space for as long as you keep reusing the same Vec, which could waste some memory, but usually this is not a big problem. You could of course call vec.shrink_to_fit() after not using it for a while to free up this space. However, we cannot apply this technique here, because if we store the Vec in TopDownContext, we would run into the same borrowing problem again. This technique also requires that you have mutable access to the Vec in order to mutate it. Both of these limitations can be overcome by using a Cell . Cell allows mutation to its inner value in an immutable context. The catch is that you cannot get a reference to its inner value , you can only take the value out, mutate it, and then set it back. Unfortunately, even this technique cannot be fully applied to should_execute_task, because it is called recursively and therefore the Cell will be empty when we try to take the Vec out. If we want to avoid heap allocations from collecting new Vecs in should_execute_task, we would need to come up with a creative solution. But this is outside of the scope of even this extra information block, so we'll just leave it at that. Finally, we need to do something with dependency checking failures. We've ignored the case where dependency.is_inconsistent returns Err. When dependency checking result in an error, we should store the error for the user to investigate, and assume the dependency is inconsistent. Change pie/src/context/mod.rs to store dependency check errors and give users access to it: And then change pie/src/context/mod.rs to store these errors: It took us a while, but now we've implemented an incremental build system with dynamic dependencies 🎉. Let's set up an example to see the fruits of our labour.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Checking tasks","id":"37","title":"Checking tasks"},"38":{"body":"In this example, we will show off incrementality using two tasks: a task that reads a string from a file, and a task that writes a string to a file. The writing task gets the string by requiring another task. Therefore, we will have a read task with a file dependency, and a write task with a task and file dependency. Because we only support one type of task, we will wrap these tasks in an enum.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Incrementality Example","id":"38","title":"Incrementality Example"},"39":{"body":"Create the pie/examples directory, and create the pie/examples/incrementality.rs file with the following contents: #![allow(unused_imports, unused_variables)] use std::fs::{File, read_to_string, remove_file, write};\nuse std::io::{self, Read, Write};\nuse std::path::{Path, PathBuf}; use dev_shared::{create_temp_dir, write_until_modified};\nuse pie::{Context, Task};\nuse pie::context::top_down::TopDownContext;\nuse pie::stamp::FileStamper; /// Enumeration over file pseudo-tasks.\n#[derive(Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\nenum FileTask { ReadStringFromFile(ReadStringFromFile), WriteStringToFile(WriteStringToFile),\n} /// [`Task`] implementation for [`FileTask`], forwarding execute to the execute functions of the pseudo-tasks.\nimpl Task for FileTask { type Output = Result<String, io::ErrorKind>; fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output { match self { FileTask::ReadStringFromFile(t) => t.execute(context), FileTask::WriteStringToFile(t) => t.execute(context).map(|_| String::new()) } }\n} FileTask is the enum over the ReadStringFromFile and WriteStringToFile \"pseudo-tasks\" that we still need to define. We call these types pseudo-tasks, because they behave like tasks, but do not actually implement Task. We implement Task on FileTask instead, which forwards the execute method to the pseudo-tasks. Both tasks can fail due to using filesystem operations, so the output is a Result. We cannot use std::io::Error as the error in the Result, because it does not implement Clone nor Eq, which need to be implemented for task outputs. Therefore, we use std::io::ErrorKind which does implement these traits. On success, we return a String. Because WriteStringToFile will not return a value (i.e., ()) on success, we return an empty string with String::new(). It would be cleaner to define an FileOutput enum that enumerates the possible outputs of file tasks, which would include a variant for WriteStringToFile returning (). But to keep this example simple we don't do that.","breadcrumbs":"Incrementality » Incremental Top-Down Context » FileTask enumeration","id":"39","title":"FileTask enumeration"},"4":{"body":"Since we will be implementing three different contexts in this tutorial, we will separate them in different modules. Create the context module by adding a module to pie/src/lib.rs: This is a diff over pie/src/lib.rs where lines with a green background are additions, lines with a red background are removals, and lines with a grey background are context on where to add/remove lines, similar to diffs on source code hubs like GitHub. Create the pie/src/context directory, and in it, create the pie/src/context/mod.rs file with the following contents: pub mod non_incremental; Both modules are public so that users of our library can access context implementations. Create the pie/src/context/non_incremental.rs file, it will be empty for now. Your project structure should now look like: pie\n├── src\n│ ├── lib.rs\n│ └── context\n│ ├── mod.rs\n│ └── non_incremental.rs\n├── Cargo.toml\n├── Cargo.lock\n└── target Confirm your module structure is correct by building with cargo build. Rust Help Modules are typically separated into different files . Modules are declared with mod context. Then, the contents of a module are defined either by creating a sibling file with the same name: context.rs, or by creating a sibling directory with the same name, with a mod.rs file in it: context/mod.rs. Use the latter if you intend to nest modules, otherwise use the former. Like traits, modules also have visibility .","breadcrumbs":"Programmability » Non-Incremental Context » Context module","id":"4","title":"Context module"},"40":{"body":"Now add ReadStringFromFile to pie/examples/incrementality.rs: /// Pseudo-task that reads a string from a file.\n#[derive(Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\nstruct ReadStringFromFile(PathBuf, FileStamper); impl ReadStringFromFile { fn new(path: impl AsRef<Path>, stamper: FileStamper) -> FileTask { FileTask::ReadStringFromFile(Self(path.as_ref().to_path_buf(), stamper)) } fn execute<C: Context<FileTask>>(&self, context: &mut C) -> Result<String, io::ErrorKind> { println!(\"Reading from {} with {:?} stamper\", self.0.file_name().unwrap().to_string_lossy(), self.1); let file = context.require_file_with_stamper(&self.0, self.1).map_err(|e| e.kind())?; if let Some(mut file) = file { let mut string = String::new(); file.read_to_string(&mut string).map_err(|e| e.kind())?; Ok(string) } else { Err(io::ErrorKind::NotFound) } }\n} We've already defined a task like this before, but now it accepts a FileStamper, prints something when it gets executed, and propagates errors. Add WriteStringToFile to pie/examples/incrementality.rs: /// Pseudo-task that writes a string to a file, where the string is provided by another task. The string provider is /// boxed to prevent a cyclic definition of infinite size, due to this type being used in [`FileTask`].\n#[derive(Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\nstruct WriteStringToFile(Box<FileTask>, PathBuf, FileStamper); impl WriteStringToFile { fn new(string_provider: impl Into<Box<FileTask>>, path: impl Into<PathBuf>, stamper: FileStamper) -> FileTask { FileTask::WriteStringToFile(Self(string_provider.into(), path.into(), stamper)) } fn execute<C: Context<FileTask>>(&self, context: &mut C) -> Result<(), io::ErrorKind> { println!(\"Writing to {} with {:?} stamper\", self.1.file_name().unwrap().to_string_lossy(), self.2); let string = context.require_task(&self.0)?; let mut file = File::create(&self.1).map_err(|e| e.kind())?; file.write_all(string.as_bytes()).map_err(|e| e.kind())?; context.require_file_with_stamper(&self.1, self.2).map_err(|e| e.kind())?; Ok(()) }\n} What is special about this task, is that it takes another task as input! Tasks in a programmatic incremental build system are first-class, meaning that they are just values that can be passed around. This is similar to closures in Rust and other programming languages, which are functions (with some values captured from the environment), but are also values that can be passed around. Tasks can therefore be seen as a form of incremental closures, although they need to be executed under a Context for incrementality, whereas closures are more free-form. WriteStringToFile requires the task to (incrementally) get the string, creating a task dependency. Then it writes that string to a file, and requires that file to create a file dependency. Boxing to prevent cyclic definition We store the task as Box<FileTask> in order to prevent a cyclic definition, which would cause FileTask to have an undetermined size. This is due to several reasons: In Rust, values are stored on the stack by default. To store something on the stack, Rust needs to know its size at compile-time . The size of an enum is the size of the largest variant. The size of a struct is the sum of the size of the fields. If we don't box the task, to calculate the size of WriteStringToFile, we need to calculate the size of FileTask, which would require calculating the size of WriteStringToFile, and so forth. Therefore, we can't calulate the size of WriteStringToFile and FileTask, which is an error. Boxing solves this because Box<FileTask> allocates a FileTask on the heap, and then creates a pointer to it. Therefore, the size of Box<FileTask> is the size of one pointer, breaking the cycle in the size calculations. Note that this explanation simplifies many aspects of Rust's size calculation .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Read/write pseudo-tasks","id":"40","title":"Read/write pseudo-tasks"},"41":{"body":"We've implemented the tasks, now add a main function to pie/examples/incrementality.rs: fn main() -> Result<(), io::Error> { let temp_dir = create_temp_dir()?; let input_file = temp_dir.path().join(\"input.txt\"); write(&input_file, \"Hi\")?; let output_file = temp_dir.path().join(\"output.txt\"); let mut context = TopDownContext::new(); let read_task = ReadStringFromFile::new(&input_file, FileStamper::Modified); let write_task = WriteStringToFile::new(read_task.clone(), &output_file, FileStamper::Modified); println!(\"A) New task: expect `read_task` to execute\"); // `read_task` is new, meaning that we have no cached output for it, thus it must be executed. let output = context.require_task(&read_task)?; assert_eq!(&output, \"Hi\"); Ok(())\n} We create some temporary files, create our tasks, create a context, and require our first task. Run this example with cargo run --example incremental. You should see the println! in ReadStringFromFile appear in your console as the incremental context correctly determines that this task is new (i.e., has no output) and must be executed. It should look something like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 1.38s Running `/pie/target/debug/examples/incremental`\nA) New task: expect `read_task` to execute\nReading from input.txt with Modified stamper Reuse If we require the task again, what should happen? Insert the following code into the main method: println!(\"\\nB) Reuse: expect no execution\"); // `read_task` is not new and its file dependency is still consistent. It is consistent because the modified time of // `input_file` has not changed, thus the modified stamp is equal. let output = context.require_task(&read_task)?; assert_eq!(&output, \"Hi\"); Running with cargo run --example incremental should produce output like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.66s Running `/pie/target/debug/examples/incremental`\nA) New task: expect `read_task` to execute\nReading from input.txt with Modified stamper B) Reuse: expect no execution We don't see the println! from ReadStringFromFile, so it was not executed, so our incremental build system has correctly reused its output! Normally we would write a test to confirm that the task was executed the first time, and that it was not executed the second time. However, this is not trivial. How do we know if the task was executed? We could track it with a global mutable boolean that ReadStringFromFile keeps track of, but this quickly becomes a mess. Therefore, we will look into creating a proper testing infrastructure in the next chapter. For now, we will continue this example with several more interesting cases. The comments in the code explain in more detail why the build system behaves in this way. Inconsistent file dependency Insert into the main method: write_until_modified(&input_file, \"Hello\")?; println!(\"\\nC) Inconsistent file dependency: expect `read_task` to execute\"); // The file dependency of `read_task` is inconsistent due to the changed modified time of `input_file`. let output = context.require_task(&read_task)?; assert_eq!(&output, \"Hello\"); If we change the file (using write_until_modified to ensure that the modified time changes to trigger the Modified file stamper) and require the task, it should execute, because the file dependency of the task is no longer consistent. New write task, reuse read task Insert into the main method: println!(\"\\nD) New task, reuse other: expect only `write_task` to execute\"); // write_task` is new, but `read_task` is not new and its file dependency is still consistent. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello\"); Now we require a new WriteStringToFile task, which requires the ReadStringFromFile task. However, since the read task is still consistent (its file dependency is consistent), we only expect the write task to execute. We also assert that the write task wrote the correct string to the file. Sound incrementality with top-down building Insert into the main method: write_until_modified(&input_file, \"Hello, World!\")?; println!(\"\\nE) Inconsistent file and task dependency: expect both tasks to execute\"); // The file dependency of `read_task` is inconsistent. Then, the task dependency from `write_task` to `read_task` is // inconsistent because `read_task` now returns `\"Hello, World!\"` as output instead of \"Hello\", and thus its equals // output stamp is different. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); We change the input file and expect both read and write tasks to execute. We require the write task, which checks whether it should be executed by consistency checking its dependencies. The write task has a task dependency to the read task, so we check that for consistency. That recurses into requiring the read task, where we again check whether it should be executed. There, we discover that its input file dependency is inconsistent, so we execute the read task, which now returns \"Hello, World!\" instead of \"Hello\". Now we are back to the consistency check for the task dependency from the write task to the read task. The previous output stamp for that task dependency is Equals(\"Hello\"), but the new stamp is Equals(\"Hello, World!\"), so the task dependency is inconsistent! Therefore, we execute the write task, which correctly writes the new string to the output file. This example shows why we need top-down incremental building for sound incrementality. To ensure that the write task writes the up-to-date string to the output file, we first need to check (and possibly execute) the read task, ensuring it returns the up-to-date string. Early cutoff Insert into the main method: write_until_modified(&input_file, \"Hello, World!\")?; // Note: writing same file contents! println!(\"\\nF) Early cutoff: expect only `read_task` to execute\"); // File dependency of `read_task` is inconsistent because the modified time changed, but it returns the same output // `\"Hello, World!\"` because the contents of the file have not actually changed. Then, the task dependency from // `write_task` to `read_task` is consistent because its output did not change, and thus the equality output stamp is // the same. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); This is very similar to the last operation. The subtle difference is that we are writing to the input file, but we write the same contents . This results in a file with a new modified time, but the same contents. We expect the read task to execute, because its file dependency is inconsistent. However, the previous output stamp of the task dependency from write to read is Equals(\"Hello, World!\"), but the new one is also Equals(\"Hello, World!\") because the read task still returns \"Hello, World!\". Therefore, the task dependency is consistent, and we do not execute the write task. We call this early cutoff , because we can cut off building a task early, if we figure out its task dependency is consistent due to having the same output stamp . Early cutoff is possible due to the precise dependency tracking provided by dynamic dependencies. This is one of the pieces that makes this build system incremental: we don't execute the write task because it is not affected by a change. Different stampers If we want the write task to always write to the output file regardless of what the read task returns, we could implement an Always output stamp that is always inconsistent. In general, output (and file) stamps can be used to finetune incrementality, ensuring that tasks are only executed when they are really affected by a change. Regenerate output files Insert into the main method: write_until_modified(&output_file, \"\")?; println!(\"\\nG) Regenerate changed output file: expect only `write_task` to execute\"); // The file dependency of `write_task` to `output_file` is inconsistent. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); write_until_modified(&output_file, \"\")?; remove_file(&output_file)?; println!(\"\\nH) Regenerate deleted output file: expect only `write_task` to execute\"); // Same results when `output_file` is deleted. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); The write task writes to an output file and then creates a file dependency to it. Therefore, if we modify or remove the output file, and require the write task, it will regenerate the output file because the file dependency is inconsistent. Many build systems do not track this dependency to output files, which can result in incrementality bugs due to output files being deleted (for example, due to a git clean). By tracking these output file dependencies, we ensure that the output files are in a consistent state after every build. Don't regenerate ouput files We can omit the file dependency in the write task to not regenerate output files when they are changed or deleted, if desired. However, this is not recommended due to the possibility of (incrementality) bugs. Different tasks Insert into the main method: let input_file_b = temp_dir.path().join(\"input_b.txt\"); write(&input_file_b, \"Test\")?; let read_task_b_modified = ReadStringFromFile::new(&input_file_b, FileStamper::Modified); let read_task_b_exists = ReadStringFromFile::new(&input_file_b, FileStamper::Exists); println!(\"\\nI) Different tasks: expect `read_task_b_modified` and `read_task_b_exists` to execute\"); // Task `read_task`, `read_task_b_modified` and `read_task_b_exists` are different, due to their `Eq` implementation // determining that their paths and stampers are different. Therefore, `read_task_b_modified` and `read_task_b_exists` // are new tasks, and must be executed. let output = context.require_task(&read_task_b_modified)?; assert_eq!(&output, \"Test\"); let output = context.require_task(&read_task_b_exists)?; assert_eq!(&output, \"Test\"); The identity of tasks is determined by their Eq and Hash implementations, which are typically derived to compare and hash all their fields. Therefore, if we create read tasks for different input file input_file_b and different stamper FileStamper::Exists, these read tasks are not equal to the existing read task, and thus are new tasks with a different identity. We require read_task_b_modified and read_task_b_exists, they are new, and are therefore executed. Same file different stampers Insert into the main method: write_until_modified(&input_file_b, \"Test Test\")?; println!(\"\\nJ) Different stampers: expect only `read_task_b_modified` to execute\"); // Both `read_task_b_modified` and `read_task_b_exists` read from the same file, but they use different stampers. // Therefore, `read_task_b_modified` must be executed because the modified time has changed, but `read_task_b_exists` // will not be executed because its file dependency stamper only checks for existence of the file, and the existence // of the file has not changed. // // Note that using an `Exists` stamper for this task does not make a lot of sense, since it will only read the file // on first execute and when it is recreated. But this is just to demonstrate different stampers. let output = context.require_task(&read_task_b_modified)?; assert_eq!(&output, \"Test Test\"); let output = context.require_task(&read_task_b_exists)?; assert_eq!(&output, \"Test\"); Here we write to input_file_b and then require read_task_b_modified and read_task_b_exists. We expect read_task_b_modified to be executed, but read_task_b_exists to be skipped, because its file dependency only checks for the existence of the input file, which has not changed. This shows that tasks can depend on the same file with different stampers, which influences whether the tasks are affected by a file change individually. Of course, using an Exists stamper for ReadStringFromFile does not make a lot of sense, but this is for demonstration purposes only. Running cargo run --example incremental now should produce output like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.78s Running `/pie/target/debug/examples/incremental`\nA) New task: expect `read_task` to execute\nReading from input.txt with Modified stamper B) Reuse: expect no execution C) Inconsistent file dependency: expect `read_task` to execute\nReading from input.txt with Modified stamper D) New task, reuse other: expect only `write_task` to execute\nWriting to output.txt with Modified stamper E) Inconsistent file and task dependency: expect both tasks to execute\nReading from input.txt with Modified stamper\nWriting to output.txt with Modified stamper F) Early cutoff: expect only `read_task` to execute\nReading from input.txt with Modified stamper G) Regenerate changed output file: expect only `write_task` to execute\nWriting to output.txt with Modified stamper H) Regenerate deleted output file: expect only `write_task` to execute\nWriting to output.txt with Modified stamper I) Different tasks: expect `read_task_b_modified` and `read_task_b_exists` to execute\nReading from input_b.txt with Modified stamper\nReading from input_b.txt with Exists stamper J) Different stampers: expect only `read_task_b_modified` to execute\nReading from input_b.txt with Modified stamper Feel free to experiment more with this example (or new example files) before continuing. In the next chapter, we will define minimality and soundness, set up an infrastructure for testing those properties, and fix issues uncovered by testing. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Exploring incrementality","id":"41","title":"Exploring incrementality"},"42":{"body":"So far, the definitions we've used for minimality (incrementality) and soundness (correctness) have been a bit vague. Let's define this more concretely and precisely. An incremental and sound build system executes a task, if and only if, it is new or affected by a change. A task is new if it has not been executed before. When it is not new, a task is affected by a change when any of its dependencies are inconsistent. A file dependency is inconsistent if its file stamp changes. A task dependency is inconsistent if, after recursively checking the task, its output stamp changes. The recursive nature of checking task dependencies ensures that indirect changes can affect tasks and cause them to be correctly executed. By defining minimality and soundness in terms of dependencies, a task author forgetting to create a dependency or not choosing the correct stamper, does not change whether our build system is minimal and sound. PIE works under the assumption that task authors correctly list all dependencies that mark their task as affected by a change when it actually is. Preventing task authoring mistakes It is of course possible to make mistakes when authoring tasks, for example by creating a dependency to the wrong file, or by forgetting to create a file dependency. Unfortunately, there is no easy way to solve this. We will be writing a build event tracking system later, for which we will make an implementation that writes the entire build log to standard output. This build log can help debug mistakes by precisely showing what the build system is doing. A technique to catch file dependency mistakes is by sandboxing the filesystem to only have access to files that have been required. For example, Bazel can perform sandboxing , but it is not fully cross-platform, and still allows reading files from absolute paths. If a cross-platform and bulletproof sandboxing library exists, it could help catch file dependency mistakes in programmatic incremental build systems. Finally, the ultimate technique to catch file dependency mistakes is by automatically creating these dependencies using filesystem tracing, instead of having the task author make them. For example, the Rattle build system uses fsatrace to automatically create file dependencies, freeing task authors from having to think about file dependencies However, filesystem tracing is also not fully cross-platform and bulletproof, so it cannot always be used. Again, if a cross-platform and bulletproof filesystem tracing library exists, it would be extremely useful for programmatic incremental build systems. In this chapter, we will show minimality and soundness by testing. However, before testing, we make minimality and soundness more precise by changing the API to work with sessions , and implement build event tracking that is needed for testing. We will continue as follows: Introduce sessions and change the API to work with sessions: Session type for performing builds in a session, and the Pie type as the entry point that manages sessions. Create infrastructure to track build events for testing and debugging purposes. Create the Tracker trait, and implement a WritingTracker for debugging and EventTracker for testing. Find a soundness hole where multiple tasks write to the same file. Fix it by tracking file write dependencies separately from read dependencies, and catch these mistakes with dynamic verification. Find a soundness hole where a task reads from a file before another task writes to it. Fix it by catching these mistakes with dynamic verification. Find a soundness hole where cyclic task execution can still occur. Fix it by changing how task dependencies are stored. Proving minimality and soundness? While proving minimality and soundness would be a very interesting exercise, I am not at all an expert in formal proofs in proof assistants such as Coq , Agda , etc. If that is something that interests you, do pursue it and get in touch!","breadcrumbs":"Minimality and Soundness » Minimality and Soundness","id":"42","title":"Minimality and Soundness"},"43":{"body":"A task is consistent if its dependencies are consistent, and consistency of file dependencies is based on the filesystem. However, the filesystem can change during a build, meaning that a task can be affected by multiple different changes in one build. For example, after executing a task, it could immediately be affected by a change in a source file again without the build system knowing about it, and that would not be minimal nor sound. Therefore, we will introduce the concept of a session . Builds are only performed in a session, and at most one session may exist at any given time. In one session, each task is checked or executed at most once , meaning that changes made to source files during a session are not guaranteed to be detected . The result is that if a task is deemed inconsistent at the time it is checked, it will be executed, and will not be checked nor executed any more that session. If a task is deemed consistent at the time it is checked, it will not be checked any more that session. This simplifies minimality and soundness, as we do not need to worry about checking tasks multiple times. Furthermore, it is also an optimisation, as requiring the same task many times only results in one check. We will implement the Session type to hold all session data, and the Pie type as an entry point into the build system that manages a session.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Minimality with Sessions","id":"43","title":"Minimality with Sessions"},"44":{"body":"Change the imports in pie/src/lib.rs: Now add the Pie and Session types to pie/src/lib.rs: /// Main entry point into PIE, a sound and incremental programmatic build system.\npub struct Pie<T, O> { store: Store<T, O>,\n} impl<T: Task> Default for Pie<T, T::Output> { fn default() -> Self { Self { store: Store::default() } }\n} impl<T: Task> Pie<T, T::Output> { /// Creates a new build session. Only one session may be active at once, enforced via mutable (exclusive) borrow. pub fn new_session(&mut self) -> Session<T, T::Output> { Session::new(self) } /// Runs `f` inside a new build session. pub fn run_in_session<R>(&mut self, f: impl FnOnce(Session<T, T::Output>) -> R) -> R { let session = self.new_session(); f(session) }\n} /// A session in which builds are executed.\npub struct Session<'p, T, O> { store: &'p mut Store<T, O>, current_executing_task: Option<TaskNode>, dependency_check_errors: Vec<io::Error>,\n} impl<'p, T: Task> Session<'p, T, T::Output> { fn new(pie: &'p mut Pie<T, T::Output>) -> Self { Self { store: &mut pie.store, current_executing_task: None, dependency_check_errors: Vec::default(), } } /// Requires `task`, returning its up-to-date output. pub fn require(&mut self, task: &T) -> T::Output { todo!(\"Create TopDownContext with this session, and require the task\") } /// Gets all errors produced during dependency checks. pub fn dependency_check_errors(&self) -> impl Iterator<Item=&io::Error> { self.dependency_check_errors.iter() }\n} We set up the types such that Pie owns the store, and Session owns all data for a build session that TopDownContext previously owned. We put the store in Pie because we want to keep the dependency graph and task outputs between build sessions, otherwise we cannot be incremental. A Session is created with Pie::new_session, which borrows Pie mutibly, ensuring that there can only be one Session instance (per Pie instance). run_in_session is a convenience method that runs given function inside a new session. Session::require should require the task with the top-down context and return its up-to-date output, which we will implement once we've changed TopDownContext. The dependency check errors can be accessed with Session::dependency_check_errors. Note that Session also has access to Store, because TopDownContext needs access to the store. The store is mutibly borrowed from Pie. Therefore, the Session struct is generic over the 'p lifetime, where the p stands for Pie. We can leave out this lifetime in Pie::new_session, because the compiler infers it from us, but we must be explicit in structs and most impls. Check that the code compiles (but gives warnings) with cargo check. Now we need to modify TopDownContext to work with Session.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » PIE and Session","id":"44","title":"PIE and Session"},"45":{"body":"Change TopDownContext to only contain a mutable reference to Session in pie/src/context/top_down.rs: Here, we use lifetime 's to denote the lifetime of a session, and make TopDownContext generic over it. new now just accepts a mutable reference to the session. The get_dependency_check_errors method can be removed. We add a require_initial convenience method for Session. In the rest of the file, we need to update the impl lines to include the lifetimes, and we need to replace most instances of self with self.session. You could do this with the following find-replace regex: self\\.([\\w\\d_]+)\\. -> self.session.$1. Change pie/src/context/top_down.rs: Now we change Session to use TopDownContext.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Update TopDownContext","id":"45","title":"Update TopDownContext"},"46":{"body":"Change pie/src/lib.rs: We reset the current_executing_task to None, to be sure that we start a build without an executing task. Then, we just create a TopDownContext and call require_initial. Finally, we can now make the context module private, as users of the library run builds using Session, instead of having to create a context implementation. Change pie/src/lib.rs: Check that the code compiles with cargo check --lib. This only checks if the library builds, but not any examples. We need to update the incrementality example to work with these changes.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Update Session","id":"46","title":"Update Session"},"47":{"body":"First change some imports in pie/examples/incremental.rs: Then, change pie/examples/incremental.rs to use sessions: When we only require one task, we replace context.require_task with pie.new_session().require. When we want to require multiple tasks, we use new_session and call session.require multiple times. It is very important to create a new session each time in this example, because a task is only checked/executed once each session. If we use a single session, our changes are never seen, and we just execute each task once, which is not what we want. Therefore, every time we make changes to source files, or expect that changes have been made to source files, we must create a new session. Note In changes I and J, Rust is smart enough to allow creating a new session even though the previous session variable is still active, because it knows that we don't use that previous session anymore. Check that all code works by running cargo test. With this new API in place, and all code adjusted to work with it, we can continue with tracking build events. Download source code You can download the source files up to this point .","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Update incremental example","id":"47","title":"Update incremental example"},"48":{"body":"So far we have had no convenient way to inspect what our build system is doing, apart from println! debugging or attaching a debugger to the program. In this section, we will change that by tracking build events for debugging and integration testing purposes. We will: Create a Tracker trait that receives build events through method calls. The Tracker trait can be implemented in different ways to handle build events in different ways. Implement a NoopTracker that does nothing, removing the tracking overhead. Make the build system generic over Tracker, such that Context implementations call methods on the tracker to create build events. Implement a WritingTracker that writes build events to standard output or standard error, for debugging purposes. Implement an EventTracker that stores build events for later inspection, for integration testing purposes. Implement a CompositeTracker that forwards build events to 2 other trackers, so we can use multiple trackers at the same time.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Tracking Build Events","id":"48","title":"Tracking Build Events"},"49":{"body":"Add the tracker module to pie/src/lib.rs: Then create the pie/src/tracker directory, create the pie/src/tracker/mod.rs file, and add the following content: use std::path::Path; use crate::stamp::{FileStamp, FileStamper, OutputStamp, OutputStamper};\nuse crate::Task; /// Trait for tracking build events. Can be used to implement logging, event tracing, progress tracking, metrics, etc.\n#[allow(unused_variables)]\npub trait Tracker<T: Task> { /// Start a new build. fn build_start(&mut self) {} /// A build has been completed. fn build_end(&mut self) {} /// A file at `path` has been required, using `stamper` to create `stamp`. fn required_file(&mut self, path: &Path, stamper: &FileStamper, stamp: &FileStamp) {} /// Require `task` using `stamper`. fn require_task(&mut self, task: &T, stamper: &OutputStamper) {} /// A `task` has been required, resulting in consistent `output`, using `stamper` to create `stamp`, and task /// `was_executed`. fn required_task(&mut self, task: &T, output: &T::Output, stamper: &OutputStamper, stamp: &OutputStamp<T::Output>, was_executed: bool) {} /// Execute `task`. fn execute(&mut self, task: &T) {} /// A `task` has been executed, producing `output`. fn executed(&mut self, task: &T, output: &T::Output) {}\n} The Tracker trait is generic over Task. Note Here, we chose to put the Task constraint on the trait itself. This will not lead to cascading constraints, as the Tracker trait will only be used as a constraint in impls, not in structs or other traits. Tracker has methods corresponding to events that happen during a build, such as a build starting or ending, requiring a file, requiring a task, and executing a task. These methods accept &mut self so that tracker implementations can perform mutation, such as storing a build event. We provide default methods that do nothing so that implementors of Tracker only have to override the methods for events they are interested in. We use #[allow(unused_variables)] on the trait to not give warnings for unused variables, as all variables are unused due to the empty default implementations. Default methods Adding a method to Tracker with a default implementation ensures that implementations of Tracker do not have to be changed to work with the new method. This is both good and bad. Good because we can add methods without breaking compatibility. Bad because we can forget to handle a new method, which can lead to problems with for example a composite tracker that forwards events to 2 trackers. In this tutorial we chose the convenient option, but be sure to think about these kind of tradeoffs yourself! Check that the code compiles with cargo test.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Tracker trait","id":"49","title":"Tracker trait"},"5":{"body":"Implement the non-incremental context in pie/src/context/non_incremental.rs by adding: use crate::{Context, Task}; pub struct NonIncrementalContext; impl<T: Task> Context<T> for NonIncrementalContext { fn require_task(&mut self, task: &T) -> T::Output { task.execute(self) }\n} This NonIncrementalContext is extremely simple: in require_task we unconditionally execute the task, and pass self along so the task we're calling can require additional tasks. Let's write some tests to see if this does what we expect. Rust Help In Rust, libraries are called crates . We import the Context and Task traits from the root of your crate (i.e., the src/lib.rs file) using crate:: as a prefix. Structs are concrete types that can contain data through fields and implement traits, similar to classes in class-oriented languages. Since we don't need any data in NonIncrementalContext, we define it as a unit-like struct . Traits are implemented for a type with impl Context for NonIncrementalContext { ... }, where we then have to implement all methods and associated types of the trait. The Context trait is generic over Task, so in the impl block we introduce a type parameter T with impl<T>, and use trait bounds as impl<T: Task> to declare that T must implement Task. The last expression of a function – in this case task.execute(self) in require_task which is an expression because it does not end with ; – is used as the return value. We could also write that as return task.execute(self);, but that is more verbose.","breadcrumbs":"Programmability » Non-Incremental Context » Implementation","id":"5","title":"Implementation"},"50":{"body":"Add a no-op tracker, which is a tracker that does nothing, by adding the following code to pie/src/tracker/mod.rs: /// [`Tracker`] that does nothing.\n#[derive(Copy, Clone, Debug)]\npub struct NoopTracker;\nimpl<T: Task> Tracker<T> for NoopTracker {} Due to the default methods that do nothing on Tracker, this implementation is extremely simple. Removing tracker overhead We will use generics to select which tracker implementation to use. Therefore, all calls to trackers are statically dispatched, and could be inlined. Because NoopTracker only has empty methods, and those empty methods can be inlined, using NoopTracker will effectively remove all tracking code from your binary, thus removing the overhead of tracking if you don't want it. In this tutorial, we do not annotate methods with #[inline] , meaning that the Rust compiler (and the LLVM backend) will make its own decisions on what to make inlineable and what not. If you care about performance here, be sure to annotate those default empty methods with #[inline].","breadcrumbs":"Minimality and Soundness » Tracking Build Events » No-op tracker","id":"50","title":"No-op tracker"},"51":{"body":"Now we will make the build system generic over Tracker, and insert Tracker calls in context implementations. Make Pie and Session generic over Tracker by modifying pie/src/lib.rs: We use A as the generic argument for tracker types in the source code. The Pie struct owns the tracker, similarly to how it owns the store. Pie can be created with a specific tracker with with_tracker, and provides access to the tracker with tracker and tracker_mut. Default type We assign NoopTracker as the default type for trackers in Pie, so that no tracking is performed when we use the Pie type without an explicit tracker type. The Default implementation only works with NoopTracker, because we impl Default for Pie<T, T::Output>, which is equivalent to impl Default for Pie<T, T::Output, NoopTracker> due to the default type. We make Session generic over trackers, and mutibly borrow the tracker from Pie, again like we do with the store. For convenience, Session also provides access to the tracker with tracker and tracker_mut. Now we make TopDownContext generic over Tracker, and insert calls to tracker methods. Modify pie/src/context/top_down.rs: We make TopDownContext generic over trackers, and call methods on the tracker: build_start/build_end in require_initial to track build start and ends, required_file in require_file_with_stamper to track file dependencies, require_task/required_task in require_file_with_stamper to track task dependencies, execute/executed in require_task_with_stamper to track task execution start and ends. In require_file_with_stamper, we also extract should_execute into a variable, and pull dependency out of the if, so that we can pass the required data to tracker.required_task. Check that the code compiles with cargo test. Existing code should keep working due to the NoopTracker default type in Pie. We won't modify NonIncrementalContext to use a tracker, as NonIncrementalContext has no state, so we cannot pass a tracker to it.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Using the Tracker trait","id":"51","title":"Using the Tracker trait"},"52":{"body":"Now we can implement some interesting trackers. We start with a simple WritingTracker that writes build events to some writer. Add the writing module to pie/src/tracker/mod.rs: Then create the pie/src/tracker/writing.rs file and add: use std::io::{self, BufWriter, Stderr, Stdout, Write}; use crate::stamp::{OutputStamp, OutputStamper};\nuse crate::Task;\nuse crate::tracker::Tracker; /// [`Tracker`] that writes events to a [`Write`] instance, for example [`Stdout`].\n#[derive(Clone, Debug)]\npub struct WritingTracker<W> { writer: W, indentation: u32,\n} impl WritingTracker<BufWriter<Stdout>> { /// Creates a [`WritingTracker`] that writes to buffered standard output. pub fn with_stdout() -> Self { Self::new(BufWriter::new(io::stdout())) }\n}\nimpl WritingTracker<BufWriter<Stderr>> { /// Creates a [`WritingTracker`] that writes to buffered standard error. pub fn with_stderr() -> Self { Self::new(BufWriter::new(io::stderr())) }\n}\nimpl<W: Write> WritingTracker<W> { /// Creates a [`WritingTracker`] that writes to `writer`. pub fn new(writer: W) -> Self { Self { writer, indentation: 0, } }\n} The WritingTracker is generic over a writer W that must implement Write, which is a standard trait for writing bytes to something. with_stdout and with_stderr can be used to create buffered writers to standard output and standard error. new can be used to create a writer to anything that implements Write, such as a File. Add the Tracker implementation to pie/src/tracker/writing.rs: impl<W: Write, T: Task> Tracker<T> for WritingTracker<W> { fn required_task(&mut self, task: &T, _output: &T::Output, _stamper: &OutputStamper, _stamp: &OutputStamp<T::Output>, was_executed: bool) { if !was_executed { self.writeln(format_args!(\"✓ {:?}\", task)); self.flush(); } } fn execute(&mut self, task: &T) { self.writeln(format_args!(\"→ {:?}\", task)); self.indent(); self.flush(); } fn executed(&mut self, _task: &T, output: &T::Output) { self.unindent(); self.writeln(format_args!(\"← {:?}\", output)); self.flush(); }\n} #[allow(dead_code)]\nimpl<W: Write> WritingTracker<W> { fn writeln(&mut self, args: std::fmt::Arguments) { self.write_indentation(); writeln!(&mut self.writer, \"{}\", args).ok(); } fn write(&mut self, args: std::fmt::Arguments) { write!(&mut self.writer, \"{}\", args).ok(); } fn write_nl(&mut self) { write!(&mut self.writer, \"\\n\").ok(); } fn indent(&mut self) { self.indentation = self.indentation.saturating_add(1); } fn unindent(&mut self) { self.indentation = self.indentation.saturating_sub(1); } fn write_indentation(&mut self) { for _ in 0..self.indentation { write!(&mut self.writer, \" \").ok(); } } fn flush(&mut self) { self.writer.flush().ok(); }\n} We implement 3 tracker methods that write when: ✓: a task is required but was not executed (i.e., consistent), →: a task starts to execute, ←: when the task is done executing. The text to write is formatted with format_args!, which is passed into writeln using std::fmt::Arguments for flexibility. We flush the writer after every event to ensure that bytes are written out. When a task starts to execute, we increase indentation to signify the recursive checking/execution. When a task is done executing, we decrease the indentation again. Saturating arithmetic We use saturating_add and saturating_sub for safety, which are saturating arithmetic operations that saturate at the numeric bounds instead of overflowing. For example, 0u32.saturating_sub(1) will result in 0 instead of overflowing into 4294967295. These saturating operations are not really needed when calls to indent and unindent are balanced. However, if we make a mistake, it is better to write no indentation than to write 4294967295 spaces of indentation. Alternatively, we could use standard arithmetic operations, which panic on overflow in debug/development mode, but silently overflow in release mode. Failing writes Writes can fail, but we silently ignore them in this tutorial (with let _ = ...) for simplicity. You could panic when writing fails, but panicking when writing to standard output fails is probably going a bit too far. You could store the latest write error and give access to it, which at least allows users of WritingTracker check for some errors. In general, tracking events can fail, but the current Tracker API does not allow for propagating these errors with Result. This in turn because TopDownContext does not return Result for require_task due to the trade-offs discussed in the section on TopDownContext. If you want, you can capture more build events and write them, and/or provide more configuration as to what build events should be written. But in this tutorial, we will keep it simple like this. Check that the code compiles with cargo test. Let's try out our writing tracker in the incrementality example by modifying pie/examples/incremental.rs: We remove the println! statements from tasks and create Pie with WritingTracker. Now run the example with cargo run --example incremental, and you should see the writing tracker print consistent tasks and task executions to standard output.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Implement writing tracker","id":"52","title":"Implement writing tracker"},"53":{"body":"The writing tracker is great for debugging purposes, but we cannot use it to check whether our build system is incremental and sound. To check incrementality and soundness, we need to be able to check whether a task has executed or not, and check the order of build events. Therefore, we will implement the EventTracker that stores build events for later inspection. Add the event module to pie/src/tracker/mod.rs: Then create the pie/src/tracker/event.rs file and add: use std::path::{Path, PathBuf}; use crate::stamp::{FileStamp, FileStamper, OutputStamp, OutputStamper};\nuse crate::Task;\nuse crate::tracker::Tracker; /// [`Tracker`] that stores [events](Event) in a [`Vec`], useful in testing to assert that a context implementation is /// incremental and sound.\n#[derive(Clone, Debug)]\npub struct EventTracker<T: Task> { events: Vec<Event<T>>,\n} impl<T: Task> Default for EventTracker<T> { fn default() -> Self { Self { events: Vec::new() } }\n} /// Enumeration of important build events.\n#[derive(Debug, Clone)]\npub enum Event<T: Task> { /// A file at `path` has been required, using `stamper` to create `stamp`. RequiredFile { path: PathBuf, stamper: FileStamper, stamp: FileStamp }, /// Require `task` using `stamper`. RequireTask { task: T, stamper: OutputStamper }, /// A `task` has been required, resulting in consistent `output`, using `stamper` to create `stamp`, and task /// `was_executed`. RequiredTask { task: T, output: T::Output, stamper: OutputStamper, stamp: OutputStamp<T::Output>, was_executed: bool }, /// Execute `task`. Execute { task: T }, /// A `task` has been executed, producing `output`. Executed { task: T, output: T::Output },\n} The EventTracker stores build events in a Vec. The Event enumeration mimics the Tracker methods, but has all arguments in owned form (for example task: T instead of task: &T) as we want to store these events. Add the tracker implementation to pie/src/tracker/event.rs: impl<T: Task> Tracker<T> for EventTracker<T> { fn build_start(&mut self) { self.events.clear(); } fn required_file(&mut self, path: &Path, stamper: &FileStamper, stamp: &FileStamp) { self.events.push(Event::RequiredFile { path: path.to_path_buf(), stamper: *stamper, stamp: *stamp }); } fn require_task(&mut self, task: &T, stamper: &OutputStamper) { self.events.push(Event::RequireTask { task: task.clone(), stamper: stamper.clone() }); } fn required_task(&mut self, task: &T, output: &T::Output, stamper: &OutputStamper, stamp: &OutputStamp<T::Output>, was_executed: bool) { self.events.push(Event::RequiredTask { task: task.clone(), output: output.clone(), stamper: *stamper, stamp: stamp.clone(), was_executed }); } fn execute(&mut self, task: &T) { self.events.push(Event::Execute { task: task.clone() }); } fn executed(&mut self, task: &T, output: &T::Output) { self.events.push(Event::Executed { task: task.clone(), output: output.clone() }); }\n} We implement the relevant methods from Tracker and store the build events as Event instances in self.events. When a new build starts, we clear the events. Now we will add code to inspect the build events. This is quite a bit of code that we will be using in integration testing to test incrementality and soundness. We'll add in one go to keep the tutorial going, and we will use this code in the next section, but feel free to take some time to inspect the code. Add the following code to pie/src/tracker/event.rs: impl<T: Task> EventTracker<T> { /// Returns a slice over all events. pub fn slice(&self) -> &[Event<T>] { &self.events } /// Returns an iterator over all events. pub fn iter(&self) -> impl Iterator<Item=&Event<T>> { self.events.iter() } /// Returns `true` if `predicate` returns `true` for any event. pub fn any(&self, predicate: impl FnMut(&Event<T>) -> bool) -> bool { self.iter().any(predicate) } /// Returns the number of times `predicate` returns `true`. pub fn count(&self, predicate: impl FnMut(&&Event<T>) -> bool) -> usize { self.iter().filter(predicate).count() } /// Returns `true` if `predicate` returns `true` for exactly one event. pub fn one(&self, predicate: impl FnMut(&&Event<T>) -> bool) -> bool { self.count(predicate) == 1 } /// Returns `Some(index)` for the first event `e` where `predicate(e)` returns `true`, or `None` otherwise. pub fn index_of(&self, predicate: impl FnMut(&Event<T>) -> bool) -> Option<usize> { self.iter().position(predicate) } /// Returns `Some(v)` for the first event `e` where `f(e)` returns `Some(v)`, or `None` otherwise. pub fn find_map<R>(&self, f: impl FnMut(&Event<T>) -> Option<&R>) -> Option<&R> { self.iter().find_map(f) } /// Returns `Some((index, v))` for the first event `e` where `f(e)` returns `Some(v)`, or `None` otherwise. pub fn index_find_map<R>(&self, mut f: impl FnMut(&Event<T>) -> Option<&R>) -> Option<(usize, &R)> { self.iter().enumerate().find_map(|(i, e)| f(e).map(|o| (i, o))) } /// Finds the first [required file event](Event::RequiredFile) for `path` and returns its stamp as `Some(stamp)`, or /// `None` if no event was found. pub fn stamp_of_first_required_file(&self, path: &PathBuf) -> Option<&FileStamp> { self.find_map(|e| e.stamp_of_required_file(path)) } /// Returns `true` if any task was executed. pub fn any_execution(&self) -> bool { self.any(|e| e.is_execution()) } /// Returns `true` if `task` was executed. pub fn any_execution_of(&self, task: &T) -> bool { self.any(|e| e.is_execution_of(task)) } /// Returns `true` if `task` was executed exactly once. pub fn one_execute_of(&self, task: &T) -> bool { self.one(|e| e.is_execute(task)) } /// Finds the first [task execute event](Event::Execute) for `task` and returns its index as `Some(index)`, or `None` /// if no event was found. pub fn index_of_first_execute(&self, task: &T) -> Option<usize> { self.index_of(|e| e.is_execute(task)) } /// Finds the first [task executed event](Event::Executed) for `task` and returns its index as `Some(index)`, or /// `None` if no event was found. pub fn index_of_first_executed(&self, task: &T) -> Option<usize> { self.index_of(|e| e.output_of_executed(task).is_some()) } /// Finds the first [task executed event](Event::Executed) for `task` and returns its index and output as /// `Some((index, output))`, or `None` if no event was found. pub fn index_output_of_first_executed(&self, task: &T) -> Option<(usize, &T::Output)> { self.index_find_map(|e| e.output_of_executed(task)) }\n} impl<T: Task> Event<T> { /// Returns `Some(stamp)` if this is a [required file event](Event::RequiredFile) for file at `path`, or `None` /// otherwise. pub fn stamp_of_required_file(&self, path: &PathBuf) -> Option<&FileStamp> { match self { Event::RequiredFile { path: p, stamp, .. } if p == path => Some(stamp), _ => None, } } /// Returns `true` if this is a task execution (execute or executed) event. pub fn is_execution(&self) -> bool { match self { Event::Execute { .. } => true, Event::Executed { .. } => true, _ => false, } } /// Returns `true` if this is an execution (execute or executed) event for `task`. pub fn is_execution_of(&self, task: &T) -> bool { match self { Event::Execute { task: t } if t == task => true, Event::Executed { task: t, .. } if t == task => true, _ => false, } } /// Returns `true` if this is a [task execute event](Event::Execute) for `task`. pub fn is_execute(&self, task: &T) -> bool { match self { Event::Execute { task: t } if t == task => true, _ => false, } } /// Returns `Some(output)` if this is a [task executed event](Event::Executed) for `task`, or `None` otherwise. pub fn output_of_executed(&self, task: &T) -> Option<&T::Output> { match self { Event::Executed { task: t, output: o } if t == task => Some(o), _ => None, } }\n} We add several general inspection methods to EventTracker: slice and iter provide raw access to all stored Events, any, count, and one are for checking predicates over all events, index_of for finding the index of the first event given a predicate, find_map and index_find_map for finding the first event given some function, returning the output (and also index in index_find_map) of that function. We add methods for specific kinds of events, following the general methods. Finally, we add convenience methods to Event for checking specific kinds of events. Check that the code compiles with cargo test.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Implement event tracker","id":"53","title":"Implement event tracker"},"54":{"body":"Currently, we cannot use both EventTracker and WritingTracker at the same time. We want this so that we can check incrementality and soundness, but also look at standard output for debugging, at the same time. Therefore, we will implement a CompositeTracker that forwards build events to 2 trackers. Add the following code to pie/src/tracker/mod.rs: /// [`Tracker`] that forwards build events to 2 trackers.\n#[derive(Copy, Clone, Debug)]\npub struct CompositeTracker<A1, A2>(pub A1, pub A2);\nimpl<T: Task, A1: Tracker<T>, A2: Tracker<T>> Tracker<T> for CompositeTracker<A1, A2> { fn build_start(&mut self) { self.0.build_start(); self.1.build_start(); } fn build_end(&mut self) { self.0.build_end(); self.1.build_end(); } fn required_file(&mut self, path: &Path, stamper: &FileStamper, stamp: &FileStamp) { self.0.required_file(path, stamper, stamp); self.1.required_file(path, stamper, stamp); } fn require_task(&mut self, task: &T, stamper: &OutputStamper) { self.0.require_task(task, stamper); self.1.require_task(task, stamper); } fn required_task(&mut self, task: &T, output: &T::Output, stamper: &OutputStamper, stamp: &OutputStamp<T::Output>, was_executed: bool) { self.0.required_task(task, output, stamper, stamp, was_executed); self.1.required_task(task, output, stamper, stamp, was_executed); } fn execute(&mut self, task: &T) { self.0.execute(task); self.1.execute(task); } fn executed(&mut self, task: &T, output: &T::Output) { self.0.executed(task, output); self.1.executed(task, output); }\n} CompositeTracker is a tuple struct containing 2 trackers that implements all tracker methods and forwards them to the 2 contained trackers. Its tuple fields are pub so it can be constructed with CompositeTracker(t1, t2) and the contained trackers can be accessed with c.0 and c.1. Check that the code compiles with cargo test. Now that the build event tracking infrastructure is in place, we can start integration testing! Download source code You can download the source files up to this point .","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Implement composite tracker","id":"54","title":"Implement composite tracker"},"6":{"body":"Add the following test to pie/src/context/non_incremental.rs: #[cfg(test)]\nmod test { use super::*; #[test] fn test_require_task_direct() { #[derive(Clone, PartialEq, Eq, Hash, Debug)] struct ReturnHelloWorld; impl Task for ReturnHelloWorld { type Output = String; fn execute<C: Context<Self>>(&self, _context: &mut C) -> Self::Output { \"Hello World!\".to_string() } } let mut context = NonIncrementalContext; assert_eq!(\"Hello World!\", context.require_task(&ReturnHelloWorld)); }\n} In this test, we create a struct ReturnHelloWorld which is the \"hello world\" of the build system. We implement Task for it, set its Output associated type to be String, and implement the execute method to just return \"Hello World!\". We derive the Clone, Eq, Hash, and Debug traits for ReturnHelloWorld as they are required for all Task implementations. We require the task with our context by creating a NonIncrementalContext, calling its require_task method, passing in a reference to the task. It returns the output of the task, which we test with assert_eq!. Run the test by running cargo test. The output should look something like: Compiling pie v0.1.0 (/pie) Finished test [unoptimized + debuginfo] target(s) in 0.44s Running unittests src/lib.rs (/pie/target/debug/deps/pie-6c9d55a7ef727e00) running 1 test\ntest context::non_incremental::test::test_require_task_direct ... ok test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Doc-tests pie running 0 tests test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Which indicates that the test indeed succeeds! You can experiment by returning a different string from ReturnHelloWorld::execute to see what a failed test looks like. Rust Help Unit tests for a module are typically defined by creating a nested module named test with the #[cfg(test)] attribute applied to it. In that test module, you apply #[test] to testing functions, which then get executed when you run cargo test. The #[cfg(...)] attribute provides conditional compilation for the item it is applied to. In this case, #[cfg(test)] ensures that the module is only compiled when we run cargo test. We import all definitions from the parent module (i.e., the non_incremental module) into the test module with use super::*;. In Rust, items — that is, functions, structs, implementations, etc. — can be nested inside functions. We use that in test_require_task_direct to scope ReturnHelloWorld and its implementation to the test function, so it can't clash with other test functions. In execute, we use _context as the parameter name for the context, as the parameter is unused. Unused parameters give a warning in Rust, unless it is prefixed by a _. assert_eq! is a macro that checks if its two expressions are equal. If not, it panics . This macro is typically used in tests for assertions, as a panic marks a test as failed.","breadcrumbs":"Programmability » Non-Incremental Context » Simple Test","id":"6","title":"Simple Test"},"7":{"body":"Our first test only tests a single task that does not use the context, so let's write a test with two tasks where one requires the other to increase our test coverage. Add the following test: We use the same ReturnHelloWorld task as before, but now also have a ToLowerCase task which requires ReturnHelloWorld and then turn its string lowercase. However, due to the way we've set up the types between Task and Context, we will run into a problem. Running cargo test, you should get these errors: Compiling pie v0.1.0 (/pie)\nerror[E0308]: mismatched types --> src/context/non_incremental.rs:46:30 |\n46 | context.require_task(&ReturnHelloWorld).to_lowercase() | ------------ ^^^^^^^^^^^^^^^^^ expected `&ToLowerCase`, found `&ReturnHelloWorld` | | | arguments to this method are incorrect | = note: expected reference `&ToLowerCase` found reference `&non_incremental::test::test_require_task_problematic::ReturnHelloWorld`\nnote: method defined here --> src/lib.rs:18:6 |\n18 | fn require_task(&mut self, task: &T) -> T::Output; | ^^^^^^^^^^^^ For more information about this error, try `rustc --explain E0308`.\nerror: could not compile `pie` (lib test) due to previous error The problem is that execute of ToLowerCase takes a Context<Self>, so in impl Task for ToLowerCase it takes a Context<ToLowerCase>, while we're trying to require &ReturnHelloWorld through the context. This doesn't work as Context<ToLowerCase>::require_task only takes a &ToLowerCase as input. We could change execute of ToLowerCase to take Context<ReturnHelloWorld>: But that is not allowed: Compiling pie v0.1.0 (/pie)\nerror[E0276]: impl has stricter requirements than trait --> src/context/non_incremental.rs:45:21 |\n45 | fn execute<C: Context<ReturnHelloWorld>>(&self, context: &mut C) -> Self::Output { | ^^^^^^^^^^^^^^^^^^^^^^^^^ impl has extra requirement `C: Context<non_incremental::test::test_require_task_problematic::ReturnHelloWorld>` | ::: src/lib.rs:11:3 |\n11 | fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output; | --------------------------------------------------------------------- definition of `execute` from trait For more information about this error, try `rustc --explain E0276`.\nerror: could not compile `pie` (lib test) due to previous error This is because the Task trait defines execute to take a Context<Self>, thus every implementation of Task must adhere to this, so we can't solve it this way. Effectively, due to the way we defined Task and Context, we can only use a single task implementation . However, there is a good reason for this which will become more apparent once we implement incrementality. Why only a single Task type? The gist of it is that an incremental context wants to build a single dependency graph and cache task outputs, so that we can figure out from the graph whether a task is affected by a change, and just return its output if it is not affected. Therefore, a context implementation will maintain a Store<T>. A Context<ReturnHelloWorld> and Context<ToLowerCase> would then have a Store<ReturnHelloWorld> and Store<ToLowerCase> respectively. These two stores would then maintain two different dependency graphs, one where the nodes in the graph are ReturnHelloWorld and one where the nodes are ToLowerCase. But that won't work, as we need a single dependency graph over all tasks to figure out what is affected. There are several solutions to this problem. For example, we could use trait objects . However, this introduces a whole slew of problems because many traits that we use are not trait-object safe. Clone is not object safe because it requires Sized. Eq is not object safe because it uses Self. Serializing trait-objects is problematic. There are workarounds for all these things, but it is not pretty and very complicated. Another solution would be to encapsulate different tasks into a single type, using (procedural) macros to automatically generate this single task type. This solution is more feasible, but still introduces a lot of complexity which is not worth it in this tutorial. Therefore, in this tutorial we will keep it simple. For now, we will solve this by just using a single task type which is an enumeration of the different possible tasks. Replace the test with the following: Here, we instead define a single task Test which is an enum with two variants. In its Task implementation, we match ourselves and return \"Hello World!\" when the variant is ReturnHelloWorld. When the variant is ReturnHelloWorld, we require &Self::ReturnHelloWorld through the context, which is now valid because it is an instance of Test, and turn its string lowercase and return that. This now works due to only having a single task type. Run the test with cargo test to confirm it is working. Rust Help Enums define a type by a set of variants, similar to enums in other languages, sometimes called tagged unions in other languages. The match expression matches the variant and dispatches based on that, similar to switch statements in other languages. We have defined the API for the build system and implemented a non-incremental version of it. We're now ready to start implementing an incremental context in the next chapter. Download source code You can download the source files up to this point .","breadcrumbs":"Programmability » Non-Incremental Context » Test with Multiple Tasks","id":"7","title":"Test with Multiple Tasks"},"8":{"body":"In this chapter, we will implement an incremental build context. An incremental context selectively executes tasks — only those that are affected by a change. In other words, an incremental context executes the minimum number of tasks required to make all tasks up-to-date. However, due to dynamic dependencies, this is not trivial. We cannot first gather all tasks into a dependency tree and then topologically sort that, as dependencies are added and removed while tasks are executing . To do incremental builds in the presence of dynamic dependencies, we need to check and execute affected tasks one at a time, updating the dependency graph, while tasks are executing . To achieve this, we will employ a technique called top-down incremental building , where we start checking if a top (root) task needs to be executed, and recursively check whether dependent tasks should be executed until we reach the bottom (leaf) task(s), akin to a depth-first search. Furthermore, build systems almost always interact with the file system in some way. For example, tasks read configuration and source files, or write intermediate and binary files. Thus, a change in a file can affect a task that reads it, and executing a task can result in writing to new or existing files. Therefore, we will also keep track of file dependencies . Like task dependencies, file dependencies are also tracked dynamically while tasks are executing. There are several ways to check if a file dependency is consistent (i.e., has not changed), such as checking the last modification date, or comparing a hash. To make this configurable on a per-dependency basis, we will implement stamps . A file stamp is just a value that is produced from a file, such as the modification date or hash, that is stored with the file dependency. To check if a file dependency is consistent, we just stamp the file again and compare it with the stored stamp. Similarly, we can employ stamps for task dependencies as well by stamping the output of a task. To achieve incrementality, we will continue with these steps in the following sections: Extend Context with a method to require a file , enabling tasks to specify dynamic dependencies to files. Implement file stamps and task output stamps , and extend Context with methods to select stampers , enabling tasks to specify when a dependency is consistent. Implement dynamic dependencies and their consistency checking . Implement a dependency graph store with methods to query and mutate the dependency graph. Implement the top-down incremental context that incrementally executes tasks.","breadcrumbs":"Incrementality » Introduction","id":"8","title":"Introduction"},"9":{"body":"Since build systems frequently interact with files, and changes to files can affect tasks, we need to keep track of file dependencies. Therefore, we will extend the Context API with methods to require files , enabling tasks to specify dynamic dependencies to files. Add a method to the Context trait in pie/src/lib.rs: require_file is similar to requiring a task, but instead takes a path to a file or directory on the filesystem as input. We use AsRef<Path> as the type for the path, so that we can pass anything in that can dereference to a path. For example, str has an AsRef<Path> implementation, so we can just use \"test.txt\" as a path. As an output, we return Result<Option<File>, io::Error>, with File being a handle to an open file. The reason for this complicated type is: An incremental context will want to read the metadata (such as the last modified date) of the file, or create a hash over the file, to be able to detect changes. Because getting metadata or reading the file can fail, and we want to propagate this error, we return a Result with io::Error as the error type. Tasks can create a dependency to a file that does not exist, and the existence of that file affects the task. For example, a task that prints true or false based on if a file exists. If the file does not exist (or it is a directory), we cannot open it, so we cannot return a File, hence we use Option<File> to return None. Otherwise, we return Ok(Some(file)) so that the task can read the opened file. Rust Help Recoverable error handling in Rust is done with the Result<T, E> type, which can either be Ok(t) or Err(e). In contrast to many languages which use exceptions, throwing, and exception handling; Rust treats recoverable errors just as regular values. Similarly, optional values in Rust are defined using the Option<T> type, which can either be Some(t) or None. Rust has many traits for converting values or references into others, which provides a lot of convenience in what would otherwise require a lot of explicit conversions. AsRef<T> is such a conversion trait, that can convert itself into &T. Here, we use AsRef<Path> as a generic with a trait bound to support many different kinds of values to the path argument in require_file. For example, we can call context.require_file(\"test.txt\") because str, which is the type of string constants, implements AsRef<Path> . You can also see this as a kind of method overloading, without having to provide concrete overloads for all supported types. Now we need to implement this method for NonIncrementalContext. However, because we will be performing similar file system operations in the incremental context as well, we will create some utility functions for this first. Add the fs module to pie/src/lib.rs: Create file pie/src/fs.rs with: use std::{fs, io};\nuse std::fs::{File, Metadata};\nuse std::path::Path; /// Gets the metadata for given `path`, returning:\n/// - `Ok(Some(metadata))` if a file or directory exists at given path,\n/// - `Ok(None)` if no file or directory exists at given path,\n/// - `Err(e)` if there was an error getting the metadata for given path.\npub fn metadata(path: impl AsRef<Path>) -> Result<Option<Metadata>, io::Error> { match fs::metadata(path) { Err(e) if e.kind() == io::ErrorKind::NotFound => Ok(None), Err(e) => Err(e), Ok(m) => Ok(Some(m)) }\n} /// Attempt to open file at given `path`, returning:\n/// - `Ok(Some(file))` if the file exists at given path, /// - `Ok(None)` if no file exists at given path (but a directory could exist at given path),\n/// - `Err(e)` if there was an error getting the metadata for given path, or if there was an error opening the file.\n///\n/// This function is necessary due to Windows returning an error when attempting to open a directory.\npub fn open_if_file(path: impl AsRef<Path>) -> Result<Option<File>, io::Error> { let file = match metadata(&path)? { Some(metadata) if metadata.is_file() => Some(File::open(&path)?), _ => None, }; Ok(file)\n} The metadata function gets the filesystem metadata given a path, and open_if_file opens the file for given path. The reason for these functions is that the standard library function std::fs::metadata treats non-existent files as an error, whereas we don't want to treat it as an error and just return None. Furthermore, open_if_file works around an issue where opening a directory on Windows (and possibly other operating systems) is an error, where we want to treat it as None again. The documentation comments explain the exact behaviour. Rust Help The ? operator makes it easy to propgate errors . Because errors are just values in Rust, to propgate an error, you'd normally have to match each result and manually propagate the error. The r? operator applied to a Result r does this for you, it basically desugars to something like match r { Err(e) => return Err(e), _ => {} }. Comments with three forward slashes /// are documentation comments that document the function/struct/enum/trait/etc. they are applied to. We will write some tests to confirm the behaviour, but for that we need utilities to create temporary files and directories. Furthermore, we will be writing more unit tests, integration tests, and even benchmarks in this tutorial, so we will set up these utilities in such a way that they are reachable by all these use cases. The only way to do that in Rust right now, is to create a separate crate and have the pie crate depend on it. And yes, we went from adding file dependencies, to creating file system utilities, to testing those file system utilities, to creating testing utilities, and now to making a crate for those testing utilities. Sorry about that 😅, we will start unwinding this stack soon! Next to the pie directory, create a directory named dev_shared. Create the dev_shared/Cargo.toml file with the following contents: [package]\nname = \"dev_shared\"\nversion = \"0.1.0\"\nedition = \"2021\" [dependencies]\ntempfile = \"3\" We've added the tempfile dependency here already, which is a crate that creates and automatically cleans up temporary files and directories. Rust Help We use other libraries (crates) by specifying dependencies . Because basically every Rust library adheres to semantic versioning , we can use \"3\" as a version requirement which indicates that we will use the most up-to-date 3.x.x version. Create the main library file dev_shared/src/lib.rs, with functions for creating temporary files and directories: use std::io; use tempfile::{NamedTempFile, TempDir}; /// Creates a new temporary file that gets cleaned up when dropped.\npub fn create_temp_file() -> Result<NamedTempFile, io::Error> { NamedTempFile::new() } /// Creates a new temporary directory that gets cleaned up when dropped.\npub fn create_temp_dir() -> Result<TempDir, io::Error> { TempDir::new() } Your directory structure should now look like this: ├── pie\n│ ├── src\n│ │ ├── lib.rs\n│ │ ├── context\n│ │ │ ├── mod.rs\n│ │ │ └── non_incremental.rs\n│ │ └── fs.rs\n│ ├── Cargo.toml\n│ ├── Cargo.lock\n│ └── target\n└── dev_shared ├── src │ └── lib.rs └── Cargo.toml To access these utility functions in the pie crate, add a dependency to dev_shared in pie/Cargo.toml along with another create that will help testing: We've also added the assert_matches crate, which is a handy library for asserting that a value matches a pattern. Note that these dependencies are added under dev-dependencies, indicating that these dependencies are only available when running tests, benchmarks, and examples. Therefore, users of our library will not depend on these crates, which is good, because temporary file management and assertions are not necessary to users of the library. Back to testing our filesystem utilities. Add the following tests to pie/src/fs.rs: #[cfg(test)]\nmod test { use std::fs::remove_file; use std::io; use assert_matches::assert_matches; use dev_shared::{create_temp_dir, create_temp_file}; use super::*; #[test] fn test_metadata_ok() -> Result<(), io::Error> { let temp_file = create_temp_file()?; let metadata = metadata(temp_file)?; assert_matches!(metadata, Some(metadata) => { assert!(metadata.is_file()); }); Ok(()) } #[test] fn test_metadata_none() -> Result<(), io::Error> { let temp_file = create_temp_file()?; remove_file(&temp_file)?; let metadata = metadata(&temp_file)?; assert!(metadata.is_none()); Ok(()) } #[test] fn test_open_if_file() -> Result<(), io::Error> { let temp_file = create_temp_file()?; let file = open_if_file(&temp_file)?; assert!(file.is_some()); Ok(()) } #[test] fn test_open_if_file_non_existent() -> Result<(), io::Error> { let temp_file = create_temp_file()?; remove_file(&temp_file)?; let file = open_if_file(&temp_file)?; assert!(file.is_none()); Ok(()) } #[test] fn test_open_if_file_on_directory() -> Result<(), io::Error> { let temp_dir = create_temp_dir()?; let file = open_if_file(temp_dir)?; assert!(file.is_none()); Ok(()) }\n} We test whether the functions conform to the specified behaviour. Unfortunately, we can't easily test when metadata and open_if_file should return an error, because we cannot disable read permissions on files via the Rust standard library. We use our create_temp_file and create_temp_dir utility functions to create temporary files and directories. The tempfile library takes care of deleting temporary files when they go out of scope (at the end of the test). We use assert_matches! to assert that metadata is Some(metadata), binding metadata in the => { ... } block in which we assert that the metadata describes a file. We will use this macro more in future integration tests. Rust Help Tests can return Result . When a test returns an Err, the test fails. This allows us to write more concise tests using error propagation. Now we are done unwinding our stack and have filesystem and testing utilities. Make the non-incremental context compatible by changing pie/src/context/non_incremental.rs: Since the non-incremental context does not track anything, we only try to open the file and return it, matching the contract in the documentation comment of the Context::require_file trait method. Confirm everything works with cargo test. 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construction This page was quickly created to make setup possible, but is unfinished. Make sure Rust is installed . We start by creating a new Rust crate. Create the pie directory and create the pie/Cargo.toml file with the following contents: [package]\nname = \"pie\"\nversion = \"0.1.0\"\nedition = \"2021\" Then create the pie/src directory and create the pie/src/lib.rs file, which will be left empty for now. Run cargo build to test if the project was set up correctly. The output should look something like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.12s Download source code You can download the source files up to this point .","breadcrumbs":"Programmability » Setup » Setup","id":"0","title":"Setup"},"1":{"body":"In this section, we will program the core API of the programmatic incremental build system. The unit of computation in a programmatic build system is a task . A task is kind of like a closure: a value that can be executed to produce their output. However, in an incremental programmatic build system, we also need to keep track of dynamic dependencies that are made while tasks are executing. Therefore, tasks are executed under a build context which enable them to create these dependencies. Tasks require other tasks through the context, creating a dynamic dependency and returning their up-to-date output. On the other hand, an incremental build context wants to selectively execute tasks — only those that are affected by a change. To that end, a build context will selectively execute tasks, tasks require other tasks through the build context, the build context selectively executes those, and so forth. Thus, tasks and build contexts are mutually recursive. Note In this tutorial, we will be using the words context , build context , and build system interchangeably, typically using just context as it is concise. Let's make tasks and contexts more concrete by defining them in code.","breadcrumbs":"Programmability » Programmable Build System API » Programmable Build System API","id":"1","title":"Programmable Build System API"},"10":{"body":"To check whether we need to execute a task, we need to check the dependencies of that task to see if any of them are inconsistent. To make this consistency checking configurable, we will use stamps. A dependency is inconsistent if after stamping, the new stamp is different from the old stamp. Therefore, we will implement a FileStamper that stamps files and produces a FileStamp, and an OutputStamper that stamps task outputs and produces an OutputStamp. Add the stamp module to pie/src/lib.rs: This module is public as users of the library will construct stampers.","breadcrumbs":"Incrementality » Stamps » Stamps","id":"10","title":"Stamps"},"11":{"body":"Create the pie/src/stamp.rs file and add: use std::fmt::Debug;\nuse std::io;\nuse std::path::Path;\nuse std::time::SystemTime; use crate::fs::metadata; #[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\npub enum FileStamper { Exists, Modified,\n} impl FileStamper { pub fn stamp(&self, path: impl AsRef<Path>) -> Result<FileStamp, io::Error> { match self { FileStamper::Exists => { Ok(FileStamp::Exists(path.as_ref().try_exists()?)) } FileStamper::Modified => { let Some(metadata) = metadata(path)? else { return Ok(FileStamp::Modified(None)); }; Ok(FileStamp::Modified(Some(metadata.modified()?))) } } }\n} #[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\npub enum FileStamp { Exists(bool), Modified(Option<SystemTime>),\n} We're implementing FileStamper as an enum for simplicity. A FileStamper has a single method stamp which takes something that can be dereferenced to a path, and produces a FileStamp or an error if creating the stamp failed. For now, we implement only two kinds of file stampers: Exists and Modified. The Exists stamper just returns a boolean indicating whether a file exists. It can be used to create a file dependency where a task behaves differently based on whether a file exists or not. The Modified stamper returns the last modification date if the file exists, or None if the file does not exist. We derive Eq for stamps so that we can compare them. Equal (same) stamps indicate a consistent dependency, unequal (different) indicates inconsistent. We also derive Eq for stampers, because the stamper of a dependency could change, making the dependency inconsistent.","breadcrumbs":"Incrementality » Stamps » File stamps","id":"11","title":"File stamps"},"12":{"body":"We implement task output stampers in a similar way. Add to pie/src/stamp.rs: #[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\npub enum OutputStamper { Inconsequential, Equals,\n} impl OutputStamper { pub fn stamp<O>(&self, output: O) -> OutputStamp<O> { match self { OutputStamper::Inconsequential => OutputStamp::Inconsequential, OutputStamper::Equals => OutputStamp::Equals(output), } }\n} #[derive(Clone, Eq, PartialEq, Debug)]\npub enum OutputStamp<O> { Inconsequential, Equals(O),\n} impl<O> OutputStamp<O> { pub fn as_ref(&self) -> OutputStamp<&O> { match self { OutputStamp::Inconsequential => OutputStamp::Inconsequential, OutputStamp::Equals(o) => OutputStamp::Equals(o), } }\n} The Inconsequential stamper simply ignores the output and always returns the same stamp (thus is always equal). It can be used to create a task dependency where we are interested in some side effect of a task, but don't care about its output. The Equals stamper simply wraps the output of a task, so the stamp is equal when the output is equal. Output stamps are generic over the task output type O. Trait bounds and derive macros Because O is used in the enum, the derive attributes on OutputStamp create bounds over O. Thus, OutputStamp is only Clone when O is Clone, OutputStamp is only Eq when O is Eq, and so forth. Because we declared Task::Output with bound Clone + Eq + Debug, we can be sure that OutputStamp is always Clone, Eq, and Debug. User-defined stamps FileStamper and OutputStamper could also be a trait which would allow users of the library to implement their own stampers. For simplicity, we do not explore that option in this tutorial. If you feel adventurous, you could try to implement this after you've finished the tutorial. Do note that this introduces a lot of extra generics and trait bounds everywhere, which can be a bit cumbersome.","breadcrumbs":"Incrementality » Stamps » Task output stamps","id":"12","title":"Task output stamps"},"13":{"body":"Finally, we write some tests. Add to pie/src/stamp.rs: #[cfg(test)]\nmod test { use std::fs::{remove_file, write}; use std::io; use dev_shared::create_temp_file; use super::*; #[test] fn test_exists_file_stamper() -> Result<(), io::Error> { let stamper = FileStamper::Exists; let temp_file = create_temp_file()?; let stamp = stamper.stamp(&temp_file)?; assert_eq!(stamp, stamper.stamp(&temp_file)?); remove_file(&temp_file)?; assert_ne!(stamp, stamper.stamp(&temp_file)?); Ok(()) } #[test] fn test_modified_file_stamper() -> Result<(), io::Error> { let stamper = FileStamper::Modified; let temp_file = create_temp_file()?; let stamp = stamper.stamp(&temp_file)?; assert_eq!(stamp, stamper.stamp(&temp_file)?); write(&temp_file, format!(\"{:?}\", stamp))?; let new_stamp = stamper.stamp(&temp_file)?; assert_ne!(stamp, new_stamp); let stamp = new_stamp; remove_file(&temp_file)?; assert_ne!(stamp, stamper.stamp(&temp_file)?); Ok(()) } #[test] fn test_inconsequential_output_stamper() { let stamper = OutputStamper::Inconsequential; let stamp = stamper.stamp(&1); assert_eq!(stamp, stamper.stamp(&1)); assert_eq!(stamp, stamper.stamp(&2)); } #[test] fn test_equals_output_stamper() { let stamper = OutputStamper::Equals; let stamp = stamper.stamp(&1); assert_eq!(stamp, stamper.stamp(&1)); assert_ne!(stamp, stamper.stamp(&2)); }\n} We test file stamps by creating a stamp, changing the file, creating a new stamp, and then compare the stamps. We test task output stamps by just passing a different output value to the stamp function, and then compare the stamps. Run cargo test to confirm the stamp implementation. If test test_modified_file_stamper fails, do continue to the next section, because we're going to fix it!","breadcrumbs":"Incrementality » Stamps » Tests","id":"13","title":"Tests"},"14":{"body":"Unfortunately, these tests may fail on some operating systems (Linux and Windows in my testing), due to an imprecise file last modified timer. What can happen is that we write to a file, making the OS update its modified time to 1000 (as an example, not a real timestamp), then very quickly write to the file again, making the OS update its modified time to 1000 again. Then, our test will fail because the stamp didn't change even though we expect it to change. This can happen with an imprecise timer that only increases once every millisecond (again, an example, not a real number) when we perform writes in between that millisecond. Even worse, our test can be flaky, sometimes succeeding if we write in between those milliseconds, sometimes failing if we write within a millisecond. To solve this, add a function to the filesystem testing utility crate. Change dev_shared/src/lib.rs: The write_until_modified function writes to the file, but ensures its modified time will change. Now change the tests in pie/src/stamp.rs to use this function: Now we use write_until_modified to write to the file, ensuring its modified time will change, ensuring the stamp will change when it should. Run cargo test to confirm the stamp implementation, which should succeed now.","breadcrumbs":"Incrementality » Stamps » Testing with file modified time, correctly","id":"14","title":"Testing with file modified time, correctly"},"15":{"body":"We now have a module dedicated to stamps. However, stampers are constructed by users of the library that author tasks, and they need to pass in these stampers when creating dependencies. Therefore, we need to update the Context trait to allow passing in these stampers. Change Context in pie/src/lib.rs: We add the require_file_with_stamper method which allow passing in a stamper. We add a default implementation for require_file that passes in a default stamper. The default is provided by default_require_file_stamper which can be overridden by context implementations. Now apply the same to tasks, changing Context again in pie/src/lib.rs: Update NonIncrementalContext in src/context/non_incremental.rs to implement the new methods: We just ignore the stampers in NonIncrementalContext, as they are only needed for incrementality. Run cargo test to confirm everything still works. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Stamps » Stamps in Context","id":"15","title":"Stamps in Context"},"16":{"body":"Now that we've implemented stamps, we can implement dynamic dependencies and their consistency checking. A dependency is inconsistent if after stamping, the new stamp is different from the old stamp. Therefore, dependencies need to keep track of their stamper and their previous stamp. To that end, we will implement the FileDependency and TaskDependency types with methods for consistency checking. We will also implement a Dependency type that abstracts over FileDependency and TaskDependency, which we will need for the dependency graph implementation in the next chapter. Add the dependency module to pie/src/lib.rs: This module is private, as users of the library should not construct dependencies. They should only create dependencies (and choose stampers) via Context methods.","breadcrumbs":"Incrementality » Dynamic Dependencies » Dynamic Dependencies","id":"16","title":"Dynamic Dependencies"},"17":{"body":"Create the pie/src/dependency.rs file and add: use std::fmt::Debug;\nuse std::fs::File;\nuse std::io;\nuse std::path::PathBuf; use crate::{Context, Task};\nuse crate::fs::open_if_file;\nuse crate::stamp::{FileStamp, FileStamper, OutputStamp, OutputStamper}; #[derive(Clone, Eq, PartialEq, Debug)]\npub struct FileDependency { path: PathBuf, stamper: FileStamper, stamp: FileStamp,\n} impl FileDependency { /// Creates a new file dependency with `path` and `stamper`, returning: /// - `Ok(file_dependency)` normally, /// - `Err(e)` if stamping failed. #[allow(dead_code)] pub fn new(path: impl Into<PathBuf>, stamper: FileStamper) -> Result<Self, io::Error> { let path = path.into(); let stamp = stamper.stamp(&path)?; let dependency = FileDependency { path, stamper, stamp }; Ok(dependency) } /// Creates a new file dependency with `path` and `stamper`, returning: /// - `Ok((file_dependency, Some(file)))` if a file exists at given path, /// - `Ok((file_dependency, None))` if no file exists at given path (but a directory could exist at given path), /// - `Err(e)` if stamping or opening the file failed. pub fn new_with_file(path: impl Into<PathBuf>, stamper: FileStamper) -> Result<(Self, Option<File>), io::Error> { let path = path.into(); let stamp = stamper.stamp(&path)?; let file = open_if_file(&path)?; let dependency = FileDependency { path, stamper, stamp }; Ok((dependency, file)) } /// Returns the path of this dependency. #[allow(dead_code)] pub fn path(&self) -> &PathBuf { &self.path } /// Returns the stamper of this dependency. #[allow(dead_code)] pub fn stamper(&self) -> &FileStamper { &self.stamper } /// Returns the stamp of this dependency. #[allow(dead_code)] pub fn stamp(&self) -> &FileStamp { &self.stamp } /// Checks whether this file dependency is inconsistent, returning: /// - `Ok(Some(stamp))` if this dependency is inconsistent (with `stamp` being the new stamp of the dependency), /// - `Ok(None)` if this dependency is consistent, /// - `Err(e)` if there was an error checking this dependency for consistency. pub fn is_inconsistent(&self) -> Result<Option<FileStamp>, io::Error> { let new_stamp = self.stamper.stamp(&self.path)?; if new_stamp == self.stamp { Ok(None) } else { Ok(Some(new_stamp)) } }\n} A FileDependency stores the path the dependency is about, the stamper used to create a stamp for this dependency, and the stamp that was created at the time the file dependency was made. The FileDependency::new_with_file function also returns the opened file if it exists, so that users of this function can read from the file without having to open it again. We add getter methods to get parts of the file dependency without allowing mutation. Since we will use those getter methods later, we annotate them with #[allow(dead_code)] to disable unused warnings. A file dependency is inconsistent when the stored stamp is not equal to a stamp that we create at the time of checking, implemented in FileDependency::is_inconsistent. For example, if we created a file dependency (with modified stamper) for a file that was modified yesterday, then modify the file, and then call is_inconsistent on the file dependency, it would return Some(new_stamp) indicating that the dependency is inconsistent. We implement an is_inconsistent method here instead of an is_consistent method, so that we can return the changed stamp when the dependency is inconsistent, which we will use for debug logging purposes later. Creating and checking a file dependency can fail due to file operations failing (for example, cannot access the file), so we propagate those errors.","breadcrumbs":"Incrementality » Dynamic Dependencies » File dependencies","id":"17","title":"File dependencies"},"18":{"body":"Task dependencies are implemented in a similar way. Add to pie/src/dependency.rs: #[derive(Clone, Eq, PartialEq, Debug)]\npub struct TaskDependency<T, O> { task: T, stamper: OutputStamper, stamp: OutputStamp<O>,\n} impl<T: Task> TaskDependency<T, T::Output> { /// Creates a new `task` dependency with `stamper` and `output`. pub fn new(task: T, stamper: OutputStamper, output: T::Output) -> Self { let stamp = stamper.stamp(output); Self { task, stamper, stamp } } /// Returns the task of this dependency. #[allow(dead_code)] pub fn task(&self) -> &T { &self.task } /// Returns the stamper of this dependency. #[allow(dead_code)] pub fn stamper(&self) -> &OutputStamper { &self.stamper } /// Returns the stamp of this dependency. #[allow(dead_code)] pub fn stamp(&self) -> &OutputStamp<T::Output> { &self.stamp } /// Checks whether this task dependency is inconsistent, returning: /// - `Some(stamp)` if this dependency is inconsistent (with `stamp` being the new stamp of the dependency), /// - `None` if this dependency is consistent. pub fn is_inconsistent<C: Context<T>>(&self, context: &mut C) -> Option<OutputStamp<T::Output>> { let output = context.require_task(&self.task); let new_stamp = self.stamper.stamp(output); if new_stamp == self.stamp { None } else { Some(new_stamp) } }\n} A TaskDependency stores the task the dependency is about, along with its stamper and stamp that is created when the dependency is created. Task dependencies are generic over the type of tasks T, and their type of outputs O. We also add immutable getters here. Trait bounds on structs We chose not to put a Task trait bound on TaskDependency, and instead put the bound on the impl. There are several up and downsides that should be considered when making such a decision. The main upside for putting the Task bound on the TaskDependency struct, is that we can leave out O and use OutputStamp<T::Output> as the type of the stamp field. This cuts down a generic parameter, which reduces boilerplate. The downside is that we need to then put the Task bound on every struct that uses TaskDependency, which increases boilerplate. In this case, we chose not to put the trait bound on the struct to prevent that trait bound from bubbling up into other structs that use TaskDependency, as it would need to appear in almost every struct in the library. A task dependency is inconsistent if, after recursively checking it, its stamp has changed, implemented in TaskDependency::is_inconsistent. Usually, this will be using the Equals task output stamper, so a task dependency is usually inconsistent when the output of the task changes. Because we need to recursively check the task, TaskDependency::is_inconsistent requires a context to be passed in. Again, there is more mutual recursion here. This recursive consistency checking is one of the core ideas that make programmatic incremental build systems possible. But why is this so important? Why do we need recursive checking? Well, we want our build system to be sound , meaning that we must execute all tasks that are affected by a change. When we do not execute a task that is affected by a change , we are unsound , and introduce an incrementality bug ! Because of dynamic dependencies, a change in a leaf in the dependency tree may affect a task at the root. For example, a compilation task depends on a task that reads a configuration file, which depends on the configuration file. A change to a configuration file (leaf) affects a task that reads the configuration file, which in turn affects the compilation task (root). Therefore, we need to recursively check the dependency tree in order to execute all tasks affected by changes. A different way to think about this, is to think about the invariant of the dependency consistency checking. The invariant is that a dependency is consistent if and only if the subtree of that dependency is consistent, and the dependency itself is consistent. The easiest way to adhere to this invariant, is recursive checking. A final note about recursive checking is that tasks can be executed during it, and executing task can lead to new dynamic dependencies. However, recursive checking handles this without problems because these dependencies are created through the Context, which in turn will call is_inconsistent when needed.","breadcrumbs":"Incrementality » Dynamic Dependencies » Task dependencies","id":"18","title":"Task dependencies"},"19":{"body":"Finally, we create a Dependency enum that abstracts over these two kinds of dependencies. Add to pie/src/dependency.rs: #[derive(Clone, Eq, PartialEq, Debug)]\npub enum Dependency<T, O> { RequireFile(FileDependency), RequireTask(TaskDependency<T, O>),\n} #[derive(Clone, Eq, PartialEq, Debug)]\npub enum InconsistentDependency<O> { File(FileStamp), Task(OutputStamp<O>),\n} impl<T: Task> Dependency<T, T::Output> { /// Checks whether this dependency is inconsistent, returning: /// - `Ok(Some(stamp))` if the dependency is inconsistent (with `stamp` being the new stamp of the dependency), /// - `Ok(None)` if the dependency is consistent, /// - `Err(e)` if there was an error checking the dependency for consistency. pub fn is_inconsistent<C: Context<T>>(&self, context: &mut C) -> Result<Option<InconsistentDependency<T::Output>>, io::Error> { let option = match self { Dependency::RequireFile(d) => d.is_inconsistent()? .map(|s| InconsistentDependency::File(s)), Dependency::RequireTask(d) => d.is_inconsistent(context) .map(|s| InconsistentDependency::Task(s)), }; Ok(option) }\n} Dependency just merges the two kinds of dependencies and provides an is_inconsistent method that calls the corresponding method. We return the changed stamp here as well for debug logging later. We wrap the changed stamp in an InconsistentDependency enum, and map to the correct variant if there is an inconsistency. Because Dependency can store a TaskDependency, we need to propagate the T and O generics. Likewise, InconsistentDependency propagates the O generic for OutputStamp. User-defined dependencies Like with stampers, Dependency could also be a trait to allow users of the library to define their own dependencies. However, as we will see later, these dynamic dependencies also require validation, and I am unsure how such a Dependency trait should look. Therefore, we don't have an appendix on how to implement this. But, if you have an idea on how to this nicely (after you've completed this tutorial), please get in touch!","breadcrumbs":"Incrementality » Dynamic Dependencies » Dependency enum","id":"19","title":"Dependency enum"},"2":{"body":"Since we want users of the build system to implement their own tasks, we will define Task as a trait. Likewise, we will also be implementing multiple contexts in this tutorial, so we will also define Context as a trait. Add the following code to your pie/src/lib.rs file: use std::fmt::Debug;\nuse std::hash::Hash; /// A unit of computation in a programmatic incremental build system.\npub trait Task: Clone + Eq + Hash + Debug { /// Type of output this task returns when executed. type Output: Clone + Eq + Debug; /// Execute the task, using `context` to specify dynamic dependencies, returning `Self::Output`. fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output;\n} /// Programmatic incremental build context, enabling tasks to create dynamic dependencies that context implementations /// use for incremental execution.\npub trait Context<T: Task> { /// Requires given `task`, recording a dependency and selectively executing it. Returns its up-to-date output. fn require_task(&mut self, task: &T) -> T::Output;\n} Note If this seems overwhelming to you, don't worry. We will go through the API and explain things. But more importantly, the API should become more clear once we implement it in the next section and subsequent chapters. Furthermore, if you're new to Rust and/or need help understanding certain concepts, I will try to explain them in Rust Help blocks. They are collapsed by default to reduce distraction, clicking the header opens them. See the first Rust Help block at the end of this section. The Task trait has several supertraits that we will need later in the tutorial to implement incrementality: Eq and Hash: to check whether a task is equal to another one, and to create a hash of it, so we can use a HashMap to get the output of a task if it is up-to-date. Clone: to create a clone of the task so that we can store it in the HashMap without having ownership of it. Debug: to format the task for debugging purposes. A Task has a single method execute, which takes a reference to itself (&self), and a mutable reference to a context (context: &mut C), and produces a value of type Self::Output. Because Context is a trait, we use generics (<C: Context<Self>>) to have execute work for any Context implementation (ignoring the Self part for now). The execute method takes self by reference such that a task can access its data, but not mutate it, as that could throw off incrementality by changing the hash/equality of the task. Finally, the type of output of a task is defined by the Output associated type, and this type must implement Clone, Eq, and Debug for the same reason as Task. The Context trait is generic over Task, allowing it to work with any task implementation. It has a single method require_task for creating a dependency to a task and returning its up-to-date result. It takes a mutable reference to itself, enabling dependency tracking and caching, which require mutation. Because of this, the context reference passed to Task::execute is also mutable. This Task and Context API mirrors the mutually recursive definition of task and context we discussed earlier, and forms the basis for the entire build system. Build the project by running cargo build. The output should look something like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.06s Rust Help The Rust Programming Language is an introductory book about Rust. I will try to provide links to the book where possible. Rust has a module system for project organization. The lib.rs file is the \"main file\" of a library. Later on, we will be creating more modules in different files. Things are imported into the current scope with use statements. We import the Debug and Hash traits from the standard library with two use statements. Use statements use paths to refer to nested things. We use :: for nesting, similar to namespaces in C++. Rust models the concept of ownership to enable memory safety without a garbage collector. The execute method accepts a reference to the current type, indicated with &: &self. This reference is immutable , meaning that we can read data from it, but not mutate it. In Rust, things are immutable by default. On the other hand, execute accepts a mutable reference to the context, indicated with &mut: context: &mut C, which does allow mutation. Traits are the main mechanism for open extensibility in Rust. They are comparable to interfaces in class-oriented languages. We will implement a context and tasks in the next section. Supertraits are a kind of inheritance. The : Clone + Eq + Hash + Debug part of the Task trait means that every Task implementation must also implement the Clone, Eq, Hash, and Debug traits. These traits are part of the standard library: Clone for duplicating values. Eq for equality comparisons, along with PartialEq . Hash for turning a value into a hash. Debug for formatting values in a programmer-facing debugging context. Clone and Eq are so common that they are part of the Rust Prelude , so we don't have to import those with use statements. Methods are functions that take a form of self as the first argument. This enables convenient object-like calling syntax: context.require_task(&task);. Associated types are a kind of placeholder type in a trait such that methods of traits can use that type. In Task this allows us to talk about the Output type of a task. In Context this allows us to refer to both the Task type T and its output type T::Output. The :: syntax here is used to access associated types of traits. The Self type in a trait is a built-in associated type that is a placeholder for the type that is implementing the trait. The Task trait is defined with pub (public) visibility , such that users of the library can implement it. Because Task uses Context in its public API, Context must also be public, even though we don't intend for users to implement their own Context. Download source code You can download the source files up to this point .","breadcrumbs":"Programmability » Programmable Build System API » API Implementation","id":"2","title":"API Implementation"},"20":{"body":"As usual, we write some tests to confirm the behaviour. Add tests to pie/src/dependency.rs: #[cfg(test)]\nmod test { use std::fs::write; use std::io::{self, Read}; use dev_shared::{create_temp_file, write_until_modified}; use crate::context::non_incremental::NonIncrementalContext; use super::*; /// Task that reads file at given path and returns it contents as a string. #[derive(Clone, PartialEq, Eq, Hash, Debug)] struct ReadStringFromFile(PathBuf); impl Task for ReadStringFromFile { type Output = String; fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output { let mut string = String::new(); let file = context.require_file(&self.0).expect(\"failed to require file\"); if let Some(mut file) = file { file.read_to_string(&mut string).expect(\"failed to read from file\"); }; string } } #[test] fn test_file_dependency_consistency() -> Result<(), io::Error> { let mut context = NonIncrementalContext; let temp_file = create_temp_file()?; write(&temp_file, \"test1\")?; let file_dependency = FileDependency::new(temp_file.path(), FileStamper::Modified)?; let dependency: Dependency<ReadStringFromFile, String> = Dependency::RequireFile(file_dependency.clone()); assert!(file_dependency.is_inconsistent()?.is_none()); assert!(dependency.is_inconsistent(&mut context)?.is_none()); // Change the file, changing the stamp the stamper will create next time, making the file dependency inconsistent. write_until_modified(&temp_file, \"test2\")?; assert!(file_dependency.is_inconsistent()?.is_some()); assert!(dependency.is_inconsistent(&mut context)?.is_some()); Ok(()) } #[test] fn test_task_dependency_consistency() -> Result<(), io::Error> { let mut context = NonIncrementalContext; let temp_file = create_temp_file()?; write(&temp_file, \"test1\")?; let task = ReadStringFromFile(temp_file.path().to_path_buf()); let output = context.require_task(&task); let task_dependency = TaskDependency::new(task.clone(), OutputStamper::Equals, output); let dependency = Dependency::RequireTask(task_dependency.clone()); assert!(task_dependency.is_inconsistent(&mut context).is_none()); assert!(dependency.is_inconsistent(&mut context)?.is_none()); // Change the file, causing the task to return a different output, changing the stamp the stamper will create next // time, making the task dependency inconsistent. write_until_modified(&temp_file, \"test2\")?; assert!(task_dependency.is_inconsistent(&mut context).is_some()); assert!(dependency.is_inconsistent(&mut context)?.is_some()); Ok(()) }\n} We test a file dependency by asserting that is_inconsistent returns Some after changing the file. Testing task dependencies requires a bit more work. We create task ReadStringFromFile that reads a string from a file, and then returns that string as output. We require the task to get its output (\"test1\"), and create a task dependency with it. Then, we change the file and check consistency of the task dependency. That recursively requires the task, the context will execute the task, and the task now returns (\"test2\"). Since we use the Equals output stamper, and \"test1\" does not equal \"test2\", the dependency is inconsistent and returns a stamp containing \"test2\". Note that we are both testing the specific dependencies (FileDependency and TaskDependency), and the general Dependency. Note Normally, a task such as ReadStringFromFile shound return a Result<String, io::Error>, but for testing purposes we are just using panics with expect. In the file dependency case, using Dependency requires an explicit type annotation because there is no task to infer the type from. We just use Dependency<ReadStringFromFile, String> as the type, and this is fine even though we don't use ReadStringFromFile in that test, because the Dependency::RequireFile variant does not use those types. Run cargo test to confirm everything still works. You will get some warnings about unused things, but that is ok as we will use them in the next section. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Dynamic Dependencies » Tests","id":"20","title":"Tests"},"21":{"body":"To do incremental building, we need to keep track of all files, tasks, their dependencies, and task outputs, in a dependency graph. This will be the responsibility of the Store data structure. Context implementations will use methods on Store to query and mutate the dependency graph. In other words, Store encapsulates the dependency graph. However, writing a dependency graph data structure is outside of the scope of this tutorial, so we will be using the pie_graph library which we prepared exactly for this use case. The graph from this library is a directed acyclic graph (DAG), meaning that edges are directed and there may be no cycles in edges, as that would prohibit topological orderings. Graph library The pie_graph library is a modified version of the great incremental-topo library which implements incremental topological ordering: it keeps the topological ordering up-to-date incrementally while nodes and edges are added and removed. That is exactly what we need, as dynamic dependencies prevents us from calculating the topological ordering in one go, and calculating the topological ordering after every task execution is prohibitively expensive. The implementation in the incremental-topo library is based on a paper by D. J. Pearce and P. H. J. Kelly that describes several dynamic topological sort algorithms for directed acyclic graphs. Add the pie_graph dependency to pie/Cargo.toml:","breadcrumbs":"Incrementality » Dependency Graph Store » Dependency Graph Store","id":"21","title":"Dependency Graph Store"},"22":{"body":"Add the store module to pie/src/lib.rs: This module is private, as users of the library should not interact with the store. Only Context implementations will use the store. Create the pie/src/store.rs file and add the following to get started: use std::path::{Path, PathBuf}; use pie_graph::{DAG, Node}; use crate::dependency::{Dependency, FileDependency, TaskDependency};\nuse crate::Task; /// Stores files and tasks, and their dependencies, in a DAG (directed acyclic graph). Provides operations to mutate\n/// and query this graph.\npub struct Store<T, O> { graph: DAG<NodeData<T, O>, Dependency<T, O>>,\n} #[derive(Debug)]\nenum NodeData<T, O> { File(PathBuf), Task { task: T, output: Option<O>, },\n} impl<T: Task> Default for Store<T, T::Output> { fn default() -> Self { Self { graph: DAG::default(), } }\n} The Store is generic over tasks T and their outputs O, like we have done before with Dependency. The DAG type from pie_graph represents a DAG with nodes and edges, and data attached to those nodes and edges. The nodes in our graph are either files or tasks, and the edges are dependencies. The first generic argument to DAG is the type of data to attach to nodes, which is NodeData<T, O> in our case. Because nodes can be files or tasks, NodeData<T, O> enumerates these, storing the path for files, and the task along with its output for tasks. We store file paths as PathBuf, which is the owned version of Path (similar to String being the owned version of str). The task output is stored as Option<O> because we can add a task to the graph without having executed it, so we don't have its output yet. The second argument is the type of data to attach to edges, which is Dependency<T, O>, using the Dependency enum we defined earlier. We implement Default for the store to initialize it. Deriving default We cannot derive this Default implementation even though it seems we should be able to, because the derived implementation will require T and O to be Default, and this is not always the case. This is because the Default derive macro is conservative and adds a : Default bound to every generic argument in the Default trait implementation, and there is no way to disable this behaviour. Therefore, we implement Default ourselves. There are several crates that have more configurable derive macros for these things, but adding an extra dependency to generate a few lines of code is not worth the extra compilation time, so we just implement it manually here.","breadcrumbs":"Incrementality » Dependency Graph Store » Store basics","id":"22","title":"Store basics"},"23":{"body":"A node in DAG is represented by a Node, which is a transparent identifier (sometimes called a handle ) that points to the node and its data. We can create nodes in the graph, and then query attached data (NodeData) given a node. So DAG allows us to go from Node to a PathBuf and task T through attached NodeData. However, we want each unique file and task to be represented by a single unique node in the graph. We need this for incrementality so that if the build system encounters the same task twice, we can find the corresponding task node in the graph the second time, check if it is consistent, and return its output if it is. To ensure unique nodes, we need to maintain the reverse mapping from PathBuf and T to Node ourselves, which we will do with HashMaps. This is also the reason for the Eq and Hash trait bounds on the Task trait, so we can use them as keys in HashMaps. Change pie/src/store.rs to add hash maps to map between these things: To prevent accidentally using a file node as a task node, and vice versa, change pie/src/store.rs to add specific types of nodes: The FileNode and TaskNode types are newtypes that wrap a Node into a specific type of node. The Borrow implementations will make subsequent code a bit more concise by automatically converting &FileNode and &TaskNodes to &Nodes. Newtypes Because the Nodes inside the newtypes are not public, it is not possible to construct a FileNode or TaskNode outside of this module. Therefore, if we only accept and create FileNode and TaskNode in the Store API, it is not possible to use the wrong kind of node. The Borrow implementation does leak outside of this module, but not outside of this crate (library). This is because the visibility of a trait implementation is the intersection of the visibilities of the trait and type it is implemented on. Borrow is public, but FileNode and TaskNode are only public within this crate. Thefore, modules of this crate can extract the Node out of FileNode and TaskNode. However, that Node cannot be used to construct a FileNode or TaskNode, so it is not a problem. Now we will add methods create nodes and to query their attached data. Add the following code to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Gets the file node for `path`, or creates a file node by adding it to the dependency graph. pub fn get_or_create_file_node(&mut self, path: impl AsRef<Path>) -> FileNode { let path = path.as_ref(); if let Some(file_node) = self.file_to_node.get(path) { *file_node } else { let node = self.graph.add_node(NodeData::File(path.to_path_buf())); let node = FileNode(node); self.file_to_node.insert(path.to_path_buf(), node); node } } /// Gets the path for `node`. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph. #[allow(dead_code)] pub fn get_file_path(&self, node: &FileNode) -> &PathBuf { let Some(NodeData::File(path)) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; path } /// Gets the task node for `task`, or creates a task node by adding it to the dependency graph. pub fn get_or_create_task_node(&mut self, task: &T) -> TaskNode { if let Some(node) = self.task_to_node.get(task) { *node } else { let node = self.graph.add_node(NodeData::Task { task: task.clone(), output: None, }); let node = TaskNode(node); self.task_to_node.insert(task.clone(), node); node } } /// Gets the task for `node`. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph. pub fn get_task(&self, node: &TaskNode) -> &T { let Some(NodeData::Task { task, .. }) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; task }\n} The get_or_create_file_node method creates file nodes. When we want to go from a file path (using impl AsRef<Path>) to a FileNode, either we have already added this file path to the graph and want to get the FileNode for it, or we have not yet added it to the graph yet and should add it. The former is handled by the if branch in get_or_create_file_node, where we just retrieve the FileNode from the file_to_node hash map. The latter is handled by the else branch where we add the node to the graph with graph.add_node which attaches the NodeData::File data to the node, and then returns a FileNode which we insert into the file_to_node map. The get_file_path method does the inverse. We get the attached data given a node, and extract the file path from it. Note that we are using panic! here to indicate that invalid usage of this method is an unrecoverable programming error that should not occur. Returning an Option<&PathBuf> makes no sense here, as the caller of this method has no way to recover from this. Because this is not an end-user-facing API (store module is private), we control all the calls to this method, and thus we are responsible for using these methods in a valid way. Therefore, when we call these methods, we should document why it is valid (if this is not immediately obvious), and we need to test whether we really use it in a valid way. We're also documenting the panics in a # Panics section in the documentation comment, as is common practice in Rust. Triggering these panics Because only Store can create FileNodes and TaskNodes, and all methods only take these values as inputs, these panics will not happen under normal usage. The only way to trigger these panics (in safe Rust) would be to create two stores, and use the nodes from one store in another. However, since this is a private module, we just need to make sure that we don't do that. There are some tricks to prevent even this kind of invalid usage. For example, the generativity crate generates unique identifiers based on lifetimes. However, that is a bit overkill, especially for an internal API, so we won't be using that. We implement similar methods for task nodes in get_or_create_task_node and get_task.","breadcrumbs":"Incrementality » Dependency Graph Store » Graph nodes","id":"23","title":"Graph nodes"},"24":{"body":"When we do not need to execute a task because it is consistent, we still need to return its output. Therefore, we store the task output in NodeData::Task and add methods to query and manipulate task outputs. Add the following code to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Checks whether task `node` has an output. Returns `false` if `node` does not have an output. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph. pub fn task_has_output(&self, node: &TaskNode) -> bool { let Some(NodeData::Task { output, .. }) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; output.is_some() } /// Gets the output for task `node`. /// /// # Panics /// /// Panics if `node` was not found in the dependency graph, or if the task has no output. pub fn get_task_output(&self, node: &TaskNode) -> &T::Output { let Some(NodeData::Task { output: Some(output), .. }) = self.graph.get_node_data(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph, or does not have an output\", node); }; output } /// Sets the output for task `node` to `new_output`. /// /// # Panics /// /// Panics if task `node` was not found in the dependency graph. pub fn set_task_output(&mut self, node: &TaskNode, new_output: T::Output) { let Some(NodeData::Task { output, .. }) = self.graph.get_node_data_mut(node) else { panic!(\"BUG: node {:?} was not found in the dependency graph\", node); }; output.replace(new_output); }\n} The task_has_output, get_task_output, and set_task_output methods manipulate task outputs in NodeData::Task. Again, we are using panics here to indicate unrecoverable programming errors.","breadcrumbs":"Incrementality » Dependency Graph Store » Task outputs","id":"24","title":"Task outputs"},"25":{"body":"Now we need methods to query and manipulate dependencies. The edges in the graph are dependencies between tasks and files. Tasks can depend on other tasks and files, but there are no dependencies between files. An edge does not have its own dedicated representation, and is simply represented by two nodes: the source node and the destination node of the edge. Add the following code to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Get all dependencies of task `src`. /// /// # Panics /// /// Panics in development builds if `src` was not found in the dependency graph. pub fn get_dependencies_of_task<'a>(&'a self, src: &'a TaskNode) -> impl Iterator<Item=&'a Dependency<T, T::Output>> + 'a { debug_assert!(self.graph.contains_node(src), \"BUG: node {:?} was not found in the dependency graph\", src); self.graph.get_outgoing_edge_data(src) } /// Add a file require `dependency` from task `src` to file `dst`. /// /// # Panics /// /// Panics if `src` or `dst` were not found in the dependency graph, or if a cycle is created by adding this dependency. pub fn add_file_require_dependency(&mut self, src: &TaskNode, dst: &FileNode, dependency: FileDependency) { match self.graph.add_edge(src, dst, Dependency::RequireFile(dependency)) { Err(pie_graph::Error::NodeMissing) => panic!(\"BUG: source node {:?} or destination node {:?} was not found in the dependency graph\", src, dst), Err(pie_graph::Error::CycleDetected) => panic!(\"BUG: cycle detected when adding file dependency from {:?} to {:?}\", src, dst), _ => {}, } } /// Adds a task require `dependency` from task `src` to task `dst`. /// /// # Errors /// /// Returns `Err(())` if adding this dependency to the graph creates a cycle. /// /// # Panics /// /// Panics if `src` or `dst` were not found in the dependency graph. pub fn add_task_require_dependency(&mut self, src: &TaskNode, dst: &TaskNode, dependency: TaskDependency<T, T::Output>) -> Result<(), ()> { match self.graph.add_edge(src, dst, Dependency::RequireTask(dependency)) { Err(pie_graph::Error::NodeMissing) => panic!(\"BUG: source node {:?} or destination node {:?} was not found in the dependency graph\", src, dst), Err(pie_graph::Error::CycleDetected) => Err(()), _ => Ok(()), } }\n} The get_dependencies_of_task method gets the dependencies (edge data of outgoing edges) of a task, and returns it as an iterator (which is empty if task has no dependencies). This method needs explicit lifetime annotations due to the signature of get_outgoing_edge_data and the way we return an iterator using impl Iterator<.... We're using debug_assert! here to trigger a panic indicating an unrecoverable programming error only in development mode, because this check is too expensive to run in release (optimized) mode. The add_file_require_dependency method adds a file dependency. Adding an edge to the graph can result in cycles, which are not allowed in a directed acyclic graph (DAG). Therefore, graph.add_edge can return an Err indicating that there is a cycle. In case of files, this cannot happen because files do not have outgoing dependencies, and the API enforces this by never taking a FileNode as a source (src) of an edge. Tasks can depend on other tasks, so they can create cycles. In add_task_require_dependency, we propagate the cycle detected error (by returning Err(())) to the caller because the caller has more information to create an error message for the user that made a cyclic task dependency.","breadcrumbs":"Incrementality » Dependency Graph Store » Dependencies","id":"25","title":"Dependencies"},"26":{"body":"Finally, when we determine that a task is inconsistent and needs to be executed, we first need to remove its output and remove its outgoing dependencies, as those will interfere with incrementality when not removed. We do NOT want to remove incoming dependencies, as that would remove dependencies from other tasks to this task, which breaks incrementality, so we can't just remove and re-add the task to the graph. Add the reset_task method that does this to pie/src/store.rs: impl<T: Task> Store<T, T::Output> { /// Reset task `src`, removing its output and removing all its outgoing dependencies. /// /// # Panics /// /// Panics if task `src` was not found in the dependency graph. pub fn reset_task(&mut self, src: &TaskNode) { if let Some(NodeData::Task { output, .. }) = self.graph.get_node_data_mut(src) { *output = None; } else { panic!(\"BUG: node {:?} was not found in the dependency graph\", src); } self.graph.remove_outgoing_edges_of_node(src); }\n} This will reset the task output back to None, and remove all outgoing edges (dependencies).","breadcrumbs":"Incrementality » Dependency Graph Store » Resetting tasks","id":"26","title":"Resetting tasks"},"27":{"body":"Now we've implemented everything we need for implementing the top-down context, but first we will write some tests.","breadcrumbs":"Incrementality » Dependency Graph Store » Tests","id":"27","title":"Tests"},"28":{"body":"Add the following code to pie/src/store.rs for testing the file mapping: #[cfg(test)]\nmod test { use crate::Context; use crate::stamp::{FileStamper, OutputStamper}; use super::*; /// Task that returns its owned string. Never executed, just used for testing the store. #[derive(Clone, PartialEq, Eq, Hash, Debug)] struct StringConstant(String); impl StringConstant { pub fn new(string: impl Into<String>) -> Self { Self(string.into()) } } impl Task for StringConstant { type Output = String; fn execute<C: Context<Self>>(&self, _context: &mut C) -> Self::Output { self.0.clone() } } #[test] fn test_file_mapping() { let mut store: Store<StringConstant, String> = Store::default(); let path_a = PathBuf::from(\"hello.txt\"); let node_a = store.get_or_create_file_node(&path_a); assert_eq!(node_a, store.get_or_create_file_node(&path_a)); // Same node assert_eq!(&path_a, store.get_file_path(&node_a)); // Same file path let path_b = PathBuf::from(\"world.txt\"); let node_b = store.get_or_create_file_node(&path_b); assert_eq!(node_b, store.get_or_create_file_node(&path_b)); assert_eq!(&path_b, store.get_file_path(&node_b)); assert_ne!(node_a, node_b); // Different nodes } #[test] #[should_panic] fn test_file_mapping_panics() { let mut fake_store: Store<StringConstant, String> = Store::default(); let fake_node = fake_store.get_or_create_file_node(\"hello.txt\"); let store: Store<StringConstant, String> = Store::default(); store.get_file_path(&fake_node); }\n} We create a simple task StringConstant because we need a Task implementation to test Store, as Store is generic over a Task type. We will never execute it because Store does not execute tasks. Test test_file_mapping checks whether the file node mapping works as expected: get_or_create_file_node calls with the same path should produce the same FileNode. get_or_create_file_node calls with different paths should produce different FileNodes. This works because \"hello.txt\" and \"world.txt\" are different paths, thus their Eq and Hash implementations ensure they get separate spots in the file_to_node hash map. Test test_file_mapping_panics triggers the panic in get_file_path by creating a FileNode with a \"fake store\", and then using that rogue file node in another store. While it is unlikely that we will make this mistake when using Store, it is good to confirm that this panics. Rust help The #[should_panic] attribute makes the test succeed if it panics, and fail if it does not panic.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing file mapping","id":"28","title":"Testing file mapping"},"29":{"body":"Test the task mapping by inserting the following code into the test module (before the last }): #[test] fn test_task_mapping() { let mut store = Store::default(); let task_a = StringConstant::new(\"Hello\"); let node_a = store.get_or_create_task_node(&task_a); assert_eq!(node_a, store.get_or_create_task_node(&task_a)); // Same node assert_eq!(&task_a, store.get_task(&node_a)); // Same task let task_b = StringConstant::new(\"World\"); let node_b = store.get_or_create_task_node(&task_b); assert_eq!(node_b, store.get_or_create_task_node(&task_b)); assert_eq!(&task_b, store.get_task(&node_b)); assert_ne!(node_a, node_b); // Different nodes } #[test] #[should_panic] fn test_task_mapping_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let store: Store<StringConstant, String> = Store::default(); store.get_task(&fake_node); } We test this in the same way as the file mapping. Again, this works because StringConstant(\"Hello\") and StringConstant(\"World\") are different due to their derived Eq and Hash implementations, which make them different due to the strings being different. Likewise, StringConstant::new(\"Hello\") and StringConstant::new(\"Hello\") are equal even if they are created with 2 separate invocations of new. These (in)equalities might seem quite obvious, but it is important to keep in mind because incrementality can only work if we can identify equal tasks at a later time, so that we can check their dependencies and return their cached output when those dependencies are consistent. Later on we will also see that this is important for soundness of the incremental build system.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing task mapping","id":"29","title":"Testing task mapping"},"3":{"body":"We set up the Task and Context API in such a way that we can implement incrementality. However, incrementality is hard , so let's start with an extremely simple non-incremental Context implementation to get a feeling for the API.","breadcrumbs":"Programmability » Non-Incremental Context » Non-Incremental Context","id":"3","title":"Non-Incremental Context"},"30":{"body":"Test task outputs by inserting the following code into the test module: #[test] fn test_task_outputs() { let mut store = Store::default(); let output_a = \"Hello\".to_string(); let task_a = StringConstant::new(&output_a); let node_a = store.get_or_create_task_node(&task_a); let output_b = \"World\".to_string(); let task_b = StringConstant::new(&output_b); let node_b = store.get_or_create_task_node(&task_b); // Assert that tasks have no output by default. assert!(!store.task_has_output(&node_a)); assert!(!store.task_has_output(&node_b)); // Set output for task A, assert that A has that output but B is unchanged. store.set_task_output(&node_a, output_a.clone()); assert!(store.task_has_output(&node_a)); assert_eq!(store.get_task_output(&node_a), &output_a); assert!(!store.task_has_output(&node_b)); // Set output for task B, assert that B has that output but A is unchanged. store.set_task_output(&node_b, output_b.clone()); assert!(store.task_has_output(&node_a)); assert_eq!(store.get_task_output(&node_a), &output_a); assert!(store.task_has_output(&node_b)); assert_eq!(store.get_task_output(&node_b), &output_b); } #[test] #[should_panic] fn test_task_has_output_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let store: Store<StringConstant, String> = Store::default(); store.task_has_output(&fake_node); } #[test] #[should_panic] fn test_get_task_output_panics() { let mut store = Store::default(); let node = store.get_or_create_task_node(&StringConstant::new(\"Hello\")); store.get_task_output(&node); } #[test] #[should_panic] fn test_set_task_output_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let mut store: Store<StringConstant, String> = Store::default(); store.set_task_output(&fake_node, \"Hello\".to_string()); } Test test_task_outputs ensures that: task_has_output only returns true if given task has an output, and that get_task_output returns the output set by set_task_output for given task. Test test_get_task_output_panics triggers a panic when we call get_task_output for a task that has no output, which is an invalid usage of Store that is more likely to happen than the other panics.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing task outputs","id":"30","title":"Testing task outputs"},"31":{"body":"Test dependencies by inserting the following code into the test module: #[test] fn test_dependencies() { let mut store = Store::default(); let output_a = \"Hello\".to_string(); let task_a = StringConstant::new(output_a.clone()); let node_a = store.get_or_create_task_node(&task_a); let output_b = \"World\".to_string(); let task_b = StringConstant::new(output_b.clone()); let node_b = store.get_or_create_task_node(&task_b); let path_c = PathBuf::from(\"hello.txt\"); let node_c = store.get_or_create_file_node(&path_c); assert_eq!(store.get_dependencies_of_task(&node_a).next(), None); assert_eq!(store.get_dependencies_of_task(&node_b).next(), None); // Add file dependency from task A to file C. let file_dependency_a2c = FileDependency::new(&path_c, FileStamper::Exists).unwrap(); store.add_file_require_dependency(&node_a, &node_c, file_dependency_a2c.clone()); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&node_a).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency_a2c.clone()))); assert_eq!(deps_of_a.get(1), None); assert_eq!(store.get_dependencies_of_task(&node_b).next(), None); // Add task dependency from task B to task A. let task_dependency_b2a = TaskDependency::new(task_a.clone(), OutputStamper::Equals, output_a.clone()); let result = store.add_task_require_dependency(&node_b, &node_a, task_dependency_b2a.clone()); assert_eq!(result, Ok(())); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&node_a).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency_a2c.clone()))); assert_eq!(deps_of_a.get(1), None); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&node_b).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireTask(task_dependency_b2a.clone()))); assert_eq!(deps_of_b.get(1), None); // Add file dependency from task B to file C. let file_dependency_b2c = FileDependency::new(&path_c, FileStamper::Exists).unwrap(); store.add_file_require_dependency(&node_b, &node_c, file_dependency_b2c.clone()); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&node_a).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency_a2c.clone()))); assert_eq!(deps_of_a.get(1), None); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&node_b).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireTask(task_dependency_b2a.clone()))); assert_eq!(deps_of_b.get(1), Some(&Dependency::RequireFile(file_dependency_b2c.clone()))); assert_eq!(deps_of_b.get(2), None); // Add task dependency from task A to task B, creating a cycle. let task_dependency_a2b = TaskDependency::new(task_a.clone(), OutputStamper::Equals, output_a.clone()); let result = store.add_task_require_dependency(&node_a, &node_b, task_dependency_a2b); assert_eq!(result, Err(())); // Creates a cycle: error } #[test] #[should_panic] fn test_get_dependencies_of_task_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let store: Store<StringConstant, String> = Store::default(); let _ = store.get_dependencies_of_task(&fake_node); } #[test] #[should_panic] fn test_add_file_require_dependency_panics() { let mut fake_store = Store::default(); let fake_file_node = fake_store.get_or_create_file_node(\"hello.txt\"); let fake_task_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let mut store: Store<StringConstant, String> = Store::default(); let dependency = FileDependency::new(\"hello.txt\", FileStamper::Exists).unwrap(); store.add_file_require_dependency(&fake_task_node, &fake_file_node, dependency); } #[test] #[should_panic] fn test_add_task_require_dependency_panics() { let mut fake_store = Store::default(); let output = \"Hello\".to_string(); let task = StringConstant::new(&output); let fake_task_node = fake_store.get_or_create_task_node(&task); let mut store: Store<StringConstant, String> = Store::default(); let dependency = TaskDependency::new(task, OutputStamper::Equals, output); let _ = store.add_task_require_dependency(&fake_task_node, &fake_task_node, dependency); } The test_dependencies test is a bit more involved because it ensures that: get_dependencies_of_task returns the dependencies of given task. If the task has no dependencies, the iterator is empty. We test if an iterator is empty by getting the first element of the iterator with .next() and assert that it is None. get_dependencies_of_task returns the dependencies of given task in the order in which they were added, which will be important for soundness later. The graph library returns dependencies in insertion order. add_task_require_dependency adds a dependency to the correct task. creating a cycle with add_task_require_dependency results in it returning Err(()). Note that the StringConstant task does not actually create file or task dependencies, but since Store never executes a task, we can pretend that it does in tests.","breadcrumbs":"Incrementality » Dependency Graph Store » Testing dependencies","id":"31","title":"Testing dependencies"},"32":{"body":"Finally, test task reset by inserting the following code into the test module: #[test] fn test_reset() { let mut store = Store::default(); let output_a = \"Hello\".to_string(); let task_a = StringConstant::new(output_a.clone()); let task_a_node = store.get_or_create_task_node(&task_a); let output_b = \"World\".to_string(); let task_b = StringConstant::new(output_b.clone()); let task_b_node = store.get_or_create_task_node(&task_b); let path = PathBuf::from(\"hello.txt\"); let file_node = store.get_or_create_file_node(&path); // Set outputs for task A and B. store.set_task_output(&task_a_node, output_a.clone()); assert!(store.task_has_output(&task_a_node)); assert_eq!(store.get_task_output(&task_a_node), &output_a); store.set_task_output(&task_b_node, output_b.clone()); assert!(store.task_has_output(&task_b_node)); assert_eq!(store.get_task_output(&task_b_node), &output_b); // Add file dependency for task A and B. let file_dependency = FileDependency::new(&path, FileStamper::Exists).unwrap(); store.add_file_require_dependency(&task_a_node, &file_node, file_dependency.clone()); let deps_of_a: Vec<_> = store.get_dependencies_of_task(&task_a_node).cloned().collect(); assert_eq!(deps_of_a.get(0), Some(&Dependency::RequireFile(file_dependency.clone()))); assert_eq!(deps_of_a.get(1), None); store.add_file_require_dependency(&task_b_node, &file_node, file_dependency.clone()); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&task_b_node).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireFile(file_dependency.clone()))); assert_eq!(deps_of_b.get(1), None); // Reset only task A. store.reset_task(&task_a_node); // Assert that task A is reset. assert!(!store.task_has_output(&task_a_node)); assert_eq!(store.get_dependencies_of_task(&task_a_node).next(), None); // Assert that task B is unchanged. assert!(store.task_has_output(&task_b_node)); assert_eq!(store.get_task_output(&task_b_node), &output_b); let deps_of_b: Vec<_> = store.get_dependencies_of_task(&task_b_node).cloned().collect(); assert_eq!(deps_of_b.get(0), Some(&Dependency::RequireFile(file_dependency.clone()))); assert_eq!(deps_of_b.get(1), None); } #[test] #[should_panic] fn test_reset_task_panics() { let mut fake_store = Store::default(); let fake_node = fake_store.get_or_create_task_node(&StringConstant::new(\"Hello\")); let mut store: Store<StringConstant, String> = Store::default(); store.reset_task(&fake_node); } Here, we ensure that a task with an output and dependencies, does not have an output and dependencies after a reset, while leaving another task untouched. Confirm that the store implementation works with cargo test. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Dependency Graph Store » Testing task reset","id":"32","title":"Testing task reset"},"33":{"body":"We've implemented all the prerequisites for incremental top-down building. Now we will create the TopDownContext type which implements the Context trait in an incremental way.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Top-down Context","id":"33","title":"Top-down Context"},"34":{"body":"Add the top_down module to pie/src/context/mod.rs: Create the pie/src/context/top_down.rs file and add the following to get started: use std::fs::File;\nuse std::io;\nuse std::path::Path; use crate::{Context, fs, Task};\nuse crate::dependency::{FileDependency, TaskDependency};\nuse crate::stamp::{FileStamper, OutputStamper};\nuse crate::store::{Store, TaskNode}; pub struct TopDownContext<T, O> { store: Store<T, O>,\n} impl<T: Task> TopDownContext<T, T::Output> { pub fn new() -> Self { Self { store: Store::default(), } }\n} impl<T: Task> Context<T> for TopDownContext<T, T::Output> { fn require_file_with_stamper<P: AsRef<Path>>(&mut self, path: P, stamper: FileStamper) -> Result<Option<File>, io::Error> { todo!() } fn require_task_with_stamper(&mut self, task: &T, stamper: OutputStamper) -> T::Output { todo!() }\n} The TopDownContext type is generic over tasks T and their outputs O, owns a Store, and can be created using new. TopDownContext implements Context, and the main challenge will be implementing the require_file_with_stamper and require_task_with_stamper methods incrementally and correctly .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Top-down context basics","id":"34","title":"Top-down context basics"},"35":{"body":"Tasks such as ReadStringFromFile which we've used in tests before call context.require_file to declare that they depend on a file in the filesystem. For incrementality, we need to add this dependency to the dependency graph. This dependency will go from the current executing task to the file. Therefore, we will need to keep track of the current executing task. Change pie/src/context/mod.rs to add a field for tracking the current executing task, and use it in require_file_with_stamper: We're not setting current_executing_task yet, as that is the responsibility of require_task_with_stamper which we will implement later. In require_file_with_stamper we're now getting the current executing task. If there is no current executing task, which only happens if a user directly calls require_file on a context, we don't make a dependency and just open the file. Now we need to add the file dependency, change pie/src/context/mod.rs to do this: We simply create or get an existing file node, create a file dependency, and add the file require dependency to the graph via store. Errors are propagated to the caller, so they can react accordingly to filesystem operation failures.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Requiring files","id":"35","title":"Requiring files"},"36":{"body":"To implement require_task_with_stamper, we need to check whether we should execute a task. A task should be executed either if it's new (it does not have an output stored yet), or if at least one of its dependencies is inconsistent. If we don't execute it, then it must have an output value and all its dependencies are consistent, so we just return its output value. Change pie/src/context/mod.rs to implement this logic: We first create or get an existing file node. Then, we check whether the task should be executed with should_execute_task which we still need to implement. If that returns true, we reset the task, set the current executing task, actually execute the task, restore the previous executing task, and set the task output. Otherwise, we get the output of the task from the store, which cannot panic because should_execute_task ensures that the task has an output if it returns false. Finally, we return the output. We still need to create a task dependency. Change pie/src/context/mod.rs to add the dependency: If there is no current executing task, which occurs when a user requires the initial task, we skip creating a dependency. Otherwise, we create a dependency and add it to the store. However, creating a task dependency can create cycles, and we need to handle that error. At this point, we need to make a hard decision about the API of our library. require_task_with_stamper returns the task output, with no opportunity to return an error. If we want to propagate this error, we'd need to change the Context::require_task API to return Result<T::Output, CycleError>. However, because tasks call these methods on Context, we'd also need to change Task::execute to return Result<T::Output, CycleError>. That would require all tasks to propagate these cycle errors every time they require another task. Furthermore, some tasks want to return their own kinds of errors, where T::Output will be Result<AnOutput, AnError>. In that case, the concrete return type would be Result<Result<AnOutput, AnError>, CycleError>, which is annoying to deal with. On the other hand, we can panic when a cycle is found, which requires no changes to the API. We do end up in a mostly unrecoverable state, so a panic is a valid option. However, this is not ideal, because it means the build system can panic due to invalid task dependencies created by the user of the system. Panics will (most of the time) stop the program, which can be annoying to deal with. This is a hard trade-off to make. Either we propagate errors which will not end the program but will introduce a lot of boilerplate and annoyance in task implementations. Or we panic which will end the program but introduces no boilerplate. In this tutorial, we will go with panics on cycles, because it results in a much simpler system. Recovering from panics Panics either abort the program (when panics are set to abort in Cargo.toml), or unwind the call stack and then end the program. When panics abort, there is nothing we can do about it. A panic will immediately abort the program. When panics unwind, the call stack is unwound, which still runs all destructors ( Drop ), and this unwinding can be caught. We can catch unwinding panics with catch_unwind , which is a way to recover from panics. This does require that the types used in the closure passed to catch_unwind are unwind safe . This is because panics exit a function early, which can mess up some invariants of your code. For example, a call to set a task output can be skipped when a panic occurs, breaking a code invariant. Therefore, types such as &mut T are not unwind safe by default, because these invariants can break under panics. Note that unwind safety is something different than the general safety guarantees provided by Rust: type-safe, memory-safe, thread-safe. An unwind unsafe type is still type-safe, memory-safe, and thread-safe. Unwind safety can be more easily achieved by using owned types which run destructors when the function call ends, which work under normal circumstances, but also when unwinding panics. In the context of the PIE build system, if we panic on unrecoverable errors, but want to allow catching these panics, we need to think about unwind safety. At any point we panic, we need to think about keeping the system in a valid state. Another way to recover from panics is to run the panicking code on a different thread. If the code panics, it will only end that thread, effectively allowing panic recovery. However, this does require some form of thread-safety, beause you are moving a computation to a different thread. Furthermore, some platforms do not have access to threads, such as WASM, where this approach would not work. A final note is that care must be taken when unwiding panics across foreign function interfaces (FFI) .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Requiring tasks","id":"36","title":"Requiring tasks"},"37":{"body":"The final piece to our puzzle is the should_execute_task implementation. Add the following code to pie/src/context/top_down.rs: The premise of should_execute_task is simple: go over the dependencies of a task until dependency.is_inconsistent is true, at which we return true. If all dependencies are consistent, then return true only if the task has no output. Otherwise, return false. However, there are some complications due to borrowing. Checking if a task dependency is inconsistent requires recursive checking: TaskDependency::is_inconsistent requires a &mut Context to call Context::require_task, which in turn can require this method again. To that end, we pass self to is_inconsistent, because self is an instance of TopDownContext which implements Context. In this method, self is &mut self, a mutable borrow. Therefore, we cannot have any other borrows active while is_inconsistent is being called, because that would violate one of the safety mechanisms of Rust where mutable borrows are exclusive . Getting the task's dependencies from the store requires a borrow, so we cannot hold onto that borrow. We get around that here by cloning the dependencies and collecting them into a Vec. We also document this fact in a comment to explain to readers (us in the future) why we do this cloning, preventing refactorings only to hit that same borrowing issue again. Cloning and collecting does have a performance overhead as we need to clone the dependencies and heap allocate a Vec to store them. For this tutorial, that is fine, but in a real-world application we should minimize cloning if possible and look into reducing heap allocations. Reference counting Cloning a Dependency results in heap allocations, because cloning FileDependency clones a PathBuf which is a heap allocated string (basically a Vec<u8>), and cloning a TaskDependency clones the Task, which may require allocations as well. One way to avoid heap allocations in both kinds of dependencies is to store the PathBuf and Task in a reference-counting pointer Rc . Then, there will only be one heap allocated PathBuf and Task, and cloning just increments the reference count. The upside is that this approach is easy to implement and reduces allocations. The downside is that clones require incrementing the reference count, which is a write operation that does have a tiny bit of overhead. In many cases, this overhead is smaller than cloning data when the data is large enough or requires heap allocations. In our case, it would probably be worth doing this, but benchmarking is required to confirm this. Note that instead of always wrapping tasks in a Rc, task authors could implement Task on Rc<TheirTask> instead. Since Rc implements Clone, any time we task.clone(), we would just increase the reference count instead. When working in a multi-threaded situation, you would use the thread-safe Arc instead. String optimizations A technique for reducing allocations on strings (and string-like types such as PathBuf) is to apply small string optimization , where small strings are stored inline instead of requiring a heap allocation. This only works if the strings are usually small enough to fit inline on the stack (for example, 32 bytes). Another technique for strings is string interning, where equal strings are stored in a central place and then re-used everywhere. This technique is great when we use the same string a lot of times. That may be a good strategy for a build system, where we work with the same file paths over and over. There are several crates implementing these techniques, but I have not used one myself yet, so I cannot recommend one. Avoiding heap allocations from collecting into Vecs Collecting the elements of an iterator into a Vec requires heap allocations as Vec is allocated on the heap. We can avoid or at least reduce the number of heap allocations by re-using the same Vec instead of creating a new one. Instead of collecting, you would store the Vec in the struct, clear it, and then extend it with the iterator. When you clear a Vec, it removes all the elements, but keeps the heap allocated space. Only if you would add more elements than it has space for, another heap allocation would be required, which will happen less and less frequently when you keep reusing the same Vec. The downside is that you are keeping this heap allocated space for as long as you keep reusing the same Vec, which could waste some memory, but usually this is not a big problem. You could of course call vec.shrink_to_fit() after not using it for a while to free up this space. However, we cannot apply this technique here, because if we store the Vec in TopDownContext, we would run into the same borrowing problem again. This technique also requires that you have mutable access to the Vec in order to mutate it. Both of these limitations can be overcome by using a Cell . Cell allows mutation to its inner value in an immutable context. The catch is that you cannot get a reference to its inner value , you can only take the value out, mutate it, and then set it back. Unfortunately, even this technique cannot be fully applied to should_execute_task, because it is called recursively and therefore the Cell will be empty when we try to take the Vec out. If we want to avoid heap allocations from collecting new Vecs in should_execute_task, we would need to come up with a creative solution. But this is outside of the scope of even this extra information block, so we'll just leave it at that. Finally, we need to do something with dependency checking failures. We've ignored the case where dependency.is_inconsistent returns Err. When dependency checking result in an error, we should store the error for the user to investigate, and assume the dependency is inconsistent. Change pie/src/context/mod.rs to store dependency check errors and give users access to it: And then change pie/src/context/mod.rs to store these errors: It took us a while, but now we've implemented an incremental build system with dynamic dependencies 🎉. Let's set up an example to see the fruits of our labour.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Checking tasks","id":"37","title":"Checking tasks"},"38":{"body":"In this example, we will show off incrementality using two tasks: a task that reads a string from a file, and a task that writes a string to a file. The writing task gets the string by requiring another task. Therefore, we will have a read task with a file dependency, and a write task with a task and file dependency. Because we only support one type of task, we will wrap these tasks in an enum.","breadcrumbs":"Incrementality » Incremental Top-Down Context » Incrementality Example","id":"38","title":"Incrementality Example"},"39":{"body":"Create the pie/examples directory, and create the pie/examples/incrementality.rs file with the following contents: #![allow(unused_imports, unused_variables)] use std::fs::{File, read_to_string, remove_file, write};\nuse std::io::{self, Read, Write};\nuse std::path::{Path, PathBuf}; use dev_shared::{create_temp_dir, write_until_modified};\nuse pie::{Context, Task};\nuse pie::context::top_down::TopDownContext;\nuse pie::stamp::FileStamper; /// Enumeration over file pseudo-tasks.\n#[derive(Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\nenum FileTask { ReadStringFromFile(ReadStringFromFile), WriteStringToFile(WriteStringToFile),\n} /// [`Task`] implementation for [`FileTask`], forwarding execute to the execute functions of the pseudo-tasks.\nimpl Task for FileTask { type Output = Result<String, io::ErrorKind>; fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output { match self { FileTask::ReadStringFromFile(t) => t.execute(context), FileTask::WriteStringToFile(t) => t.execute(context).map(|_| String::new()) } }\n} FileTask is the enum over the ReadStringFromFile and WriteStringToFile \"pseudo-tasks\" that we still need to define. We call these types pseudo-tasks, because they behave like tasks, but do not actually implement Task. We implement Task on FileTask instead, which forwards the execute method to the pseudo-tasks. Both tasks can fail due to using filesystem operations, so the output is a Result. We cannot use std::io::Error as the error in the Result, because it does not implement Clone nor Eq, which need to be implemented for task outputs. Therefore, we use std::io::ErrorKind which does implement these traits. On success, we return a String. Because WriteStringToFile will not return a value (i.e., ()) on success, we return an empty string with String::new(). It would be cleaner to define an FileOutput enum that enumerates the possible outputs of file tasks, which would include a variant for WriteStringToFile returning (). But to keep this example simple we don't do that.","breadcrumbs":"Incrementality » Incremental Top-Down Context » FileTask enumeration","id":"39","title":"FileTask enumeration"},"4":{"body":"Since we will be implementing three different contexts in this tutorial, we will separate them in different modules. Create the context module by adding a module to pie/src/lib.rs: This is a diff over pie/src/lib.rs where lines with a green background are additions, lines with a red background are removals, and lines with a grey background are context on where to add/remove lines, similar to diffs on source code hubs like GitHub. Create the pie/src/context directory, and in it, create the pie/src/context/mod.rs file with the following contents: pub mod non_incremental; Both modules are public so that users of our library can access context implementations. Create the pie/src/context/non_incremental.rs file, it will be empty for now. Your project structure should now look like: pie\n├── src\n│ ├── lib.rs\n│ └── context\n│ ├── mod.rs\n│ └── non_incremental.rs\n├── Cargo.toml\n├── Cargo.lock\n└── target Confirm your module structure is correct by building with cargo build. Rust Help Modules are typically separated into different files . Modules are declared with mod context. Then, the contents of a module are defined either by creating a sibling file with the same name: context.rs, or by creating a sibling directory with the same name, with a mod.rs file in it: context/mod.rs. Use the latter if you intend to nest modules, otherwise use the former. Like traits, modules also have visibility .","breadcrumbs":"Programmability » Non-Incremental Context » Context module","id":"4","title":"Context module"},"40":{"body":"Now add ReadStringFromFile to pie/examples/incrementality.rs: /// Pseudo-task that reads a string from a file.\n#[derive(Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\nstruct ReadStringFromFile(PathBuf, FileStamper); impl ReadStringFromFile { fn new(path: impl AsRef<Path>, stamper: FileStamper) -> FileTask { FileTask::ReadStringFromFile(Self(path.as_ref().to_path_buf(), stamper)) } fn execute<C: Context<FileTask>>(&self, context: &mut C) -> Result<String, io::ErrorKind> { println!(\"Reading from {} with {:?} stamper\", self.0.file_name().unwrap().to_string_lossy(), self.1); let file = context.require_file_with_stamper(&self.0, self.1).map_err(|e| e.kind())?; if let Some(mut file) = file { let mut string = String::new(); file.read_to_string(&mut string).map_err(|e| e.kind())?; Ok(string) } else { Err(io::ErrorKind::NotFound) } }\n} We've already defined a task like this before, but now it accepts a FileStamper, prints something when it gets executed, and propagates errors. Add WriteStringToFile to pie/examples/incrementality.rs: /// Pseudo-task that writes a string to a file, where the string is provided by another task. The string provider is /// boxed to prevent a cyclic definition of infinite size, due to this type being used in [`FileTask`].\n#[derive(Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]\nstruct WriteStringToFile(Box<FileTask>, PathBuf, FileStamper); impl WriteStringToFile { fn new(string_provider: impl Into<Box<FileTask>>, path: impl Into<PathBuf>, stamper: FileStamper) -> FileTask { FileTask::WriteStringToFile(Self(string_provider.into(), path.into(), stamper)) } fn execute<C: Context<FileTask>>(&self, context: &mut C) -> Result<(), io::ErrorKind> { println!(\"Writing to {} with {:?} stamper\", self.1.file_name().unwrap().to_string_lossy(), self.2); let string = context.require_task(&self.0)?; let mut file = File::create(&self.1).map_err(|e| e.kind())?; file.write_all(string.as_bytes()).map_err(|e| e.kind())?; context.require_file_with_stamper(&self.1, self.2).map_err(|e| e.kind())?; Ok(()) }\n} What is special about this task, is that it takes another task as input! Tasks in a programmatic incremental build system are first-class, meaning that they are just values that can be passed around. This is similar to closures in Rust and other programming languages, which are functions (with some values captured from the environment), but are also values that can be passed around. Tasks can therefore be seen as a form of incremental closures, although they need to be executed under a Context for incrementality, whereas closures are more free-form. WriteStringToFile requires the task to (incrementally) get the string, creating a task dependency. Then it writes that string to a file, and requires that file to create a file dependency. Boxing to prevent cyclic definition We store the task as Box<FileTask> in order to prevent a cyclic definition, which would cause FileTask to have an undetermined size. This is due to several reasons: In Rust, values are stored on the stack by default. To store something on the stack, Rust needs to know its size at compile-time . The size of an enum is the size of the largest variant. The size of a struct is the sum of the size of the fields. If we don't box the task, to calculate the size of WriteStringToFile, we need to calculate the size of FileTask, which would require calculating the size of WriteStringToFile, and so forth. Therefore, we can't calulate the size of WriteStringToFile and FileTask, which is an error. Boxing solves this because Box<FileTask> allocates a FileTask on the heap, and then creates a pointer to it. Therefore, the size of Box<FileTask> is the size of one pointer, breaking the cycle in the size calculations. Note that this explanation simplifies many aspects of Rust's size calculation .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Read/write pseudo-tasks","id":"40","title":"Read/write pseudo-tasks"},"41":{"body":"We've implemented the tasks, now add a main function to pie/examples/incrementality.rs: fn main() -> Result<(), io::Error> { let temp_dir = create_temp_dir()?; let input_file = temp_dir.path().join(\"input.txt\"); write(&input_file, \"Hi\")?; let output_file = temp_dir.path().join(\"output.txt\"); let mut context = TopDownContext::new(); let read_task = ReadStringFromFile::new(&input_file, FileStamper::Modified); let write_task = WriteStringToFile::new(read_task.clone(), &output_file, FileStamper::Modified); println!(\"A) New task: expect `read_task` to execute\"); // `read_task` is new, meaning that we have no cached output for it, thus it must be executed. let output = context.require_task(&read_task)?; assert_eq!(&output, \"Hi\"); Ok(())\n} We create some temporary files, create our tasks, create a context, and require our first task. Run this example with cargo run --example incremental. You should see the println! in ReadStringFromFile appear in your console as the incremental context correctly determines that this task is new (i.e., has no output) and must be executed. It should look something like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 1.42s Running `/pie/target/debug/examples/incremental`\nA) New task: expect `read_task` to execute\nReading from input.txt with Modified stamper Reuse If we require the task again, what should happen? Insert the following code into the main method: println!(\"\\nB) Reuse: expect no execution\"); // `read_task` is not new and its file dependency is still consistent. It is consistent because the modified time of // `input_file` has not changed, thus the modified stamp is equal. let output = context.require_task(&read_task)?; assert_eq!(&output, \"Hi\"); Running with cargo run --example incremental should produce output like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.69s Running `/pie/target/debug/examples/incremental`\nA) New task: expect `read_task` to execute\nReading from input.txt with Modified stamper B) Reuse: expect no execution We don't see the println! from ReadStringFromFile, so it was not executed, so our incremental build system has correctly reused its output! Normally we would write a test to confirm that the task was executed the first time, and that it was not executed the second time. However, this is not trivial. How do we know if the task was executed? We could track it with a global mutable boolean that ReadStringFromFile keeps track of, but this quickly becomes a mess. Therefore, we will look into creating a proper testing infrastructure in the next chapter. For now, we will continue this example with several more interesting cases. The comments in the code explain in more detail why the build system behaves in this way. Inconsistent file dependency Insert into the main method: write_until_modified(&input_file, \"Hello\")?; println!(\"\\nC) Inconsistent file dependency: expect `read_task` to execute\"); // The file dependency of `read_task` is inconsistent due to the changed modified time of `input_file`. let output = context.require_task(&read_task)?; assert_eq!(&output, \"Hello\"); If we change the file (using write_until_modified to ensure that the modified time changes to trigger the Modified file stamper) and require the task, it should execute, because the file dependency of the task is no longer consistent. New write task, reuse read task Insert into the main method: println!(\"\\nD) New task, reuse other: expect only `write_task` to execute\"); // write_task` is new, but `read_task` is not new and its file dependency is still consistent. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello\"); Now we require a new WriteStringToFile task, which requires the ReadStringFromFile task. However, since the read task is still consistent (its file dependency is consistent), we only expect the write task to execute. We also assert that the write task wrote the correct string to the file. Sound incrementality with top-down building Insert into the main method: write_until_modified(&input_file, \"Hello, World!\")?; println!(\"\\nE) Inconsistent file and task dependency: expect both tasks to execute\"); // The file dependency of `read_task` is inconsistent. Then, the task dependency from `write_task` to `read_task` is // inconsistent because `read_task` now returns `\"Hello, World!\"` as output instead of \"Hello\", and thus its equals // output stamp is different. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); We change the input file and expect both read and write tasks to execute. We require the write task, which checks whether it should be executed by consistency checking its dependencies. The write task has a task dependency to the read task, so we check that for consistency. That recurses into requiring the read task, where we again check whether it should be executed. There, we discover that its input file dependency is inconsistent, so we execute the read task, which now returns \"Hello, World!\" instead of \"Hello\". Now we are back to the consistency check for the task dependency from the write task to the read task. The previous output stamp for that task dependency is Equals(\"Hello\"), but the new stamp is Equals(\"Hello, World!\"), so the task dependency is inconsistent! Therefore, we execute the write task, which correctly writes the new string to the output file. This example shows why we need top-down incremental building for sound incrementality. To ensure that the write task writes the up-to-date string to the output file, we first need to check (and possibly execute) the read task, ensuring it returns the up-to-date string. Early cutoff Insert into the main method: write_until_modified(&input_file, \"Hello, World!\")?; // Note: writing same file contents! println!(\"\\nF) Early cutoff: expect only `read_task` to execute\"); // File dependency of `read_task` is inconsistent because the modified time changed, but it returns the same output // `\"Hello, World!\"` because the contents of the file have not actually changed. Then, the task dependency from // `write_task` to `read_task` is consistent because its output did not change, and thus the equality output stamp is // the same. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); This is very similar to the last operation. The subtle difference is that we are writing to the input file, but we write the same contents . This results in a file with a new modified time, but the same contents. We expect the read task to execute, because its file dependency is inconsistent. However, the previous output stamp of the task dependency from write to read is Equals(\"Hello, World!\"), but the new one is also Equals(\"Hello, World!\") because the read task still returns \"Hello, World!\". Therefore, the task dependency is consistent, and we do not execute the write task. We call this early cutoff , because we can cut off building a task early, if we figure out its task dependency is consistent due to having the same output stamp . Early cutoff is possible due to the precise dependency tracking provided by dynamic dependencies. This is one of the pieces that makes this build system incremental: we don't execute the write task because it is not affected by a change. Different stampers If we want the write task to always write to the output file regardless of what the read task returns, we could implement an Always output stamp that is always inconsistent. In general, output (and file) stamps can be used to finetune incrementality, ensuring that tasks are only executed when they are really affected by a change. Regenerate output files Insert into the main method: write_until_modified(&output_file, \"\")?; println!(\"\\nG) Regenerate changed output file: expect only `write_task` to execute\"); // The file dependency of `write_task` to `output_file` is inconsistent. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); write_until_modified(&output_file, \"\")?; remove_file(&output_file)?; println!(\"\\nH) Regenerate deleted output file: expect only `write_task` to execute\"); // Same results when `output_file` is deleted. context.require_task(&write_task)?; assert_eq!(&read_to_string(&output_file)?, \"Hello, World!\"); The write task writes to an output file and then creates a file dependency to it. Therefore, if we modify or remove the output file, and require the write task, it will regenerate the output file because the file dependency is inconsistent. Many build systems do not track this dependency to output files, which can result in incrementality bugs due to output files being deleted (for example, due to a git clean). By tracking these output file dependencies, we ensure that the output files are in a consistent state after every build. Don't regenerate ouput files We can omit the file dependency in the write task to not regenerate output files when they are changed or deleted, if desired. However, this is not recommended due to the possibility of (incrementality) bugs. Different tasks Insert into the main method: let input_file_b = temp_dir.path().join(\"input_b.txt\"); write(&input_file_b, \"Test\")?; let read_task_b_modified = ReadStringFromFile::new(&input_file_b, FileStamper::Modified); let read_task_b_exists = ReadStringFromFile::new(&input_file_b, FileStamper::Exists); println!(\"\\nI) Different tasks: expect `read_task_b_modified` and `read_task_b_exists` to execute\"); // Task `read_task`, `read_task_b_modified` and `read_task_b_exists` are different, due to their `Eq` implementation // determining that their paths and stampers are different. Therefore, `read_task_b_modified` and `read_task_b_exists` // are new tasks, and must be executed. let output = context.require_task(&read_task_b_modified)?; assert_eq!(&output, \"Test\"); let output = context.require_task(&read_task_b_exists)?; assert_eq!(&output, \"Test\"); The identity of tasks is determined by their Eq and Hash implementations, which are typically derived to compare and hash all their fields. Therefore, if we create read tasks for different input file input_file_b and different stamper FileStamper::Exists, these read tasks are not equal to the existing read task, and thus are new tasks with a different identity. We require read_task_b_modified and read_task_b_exists, they are new, and are therefore executed. Same file different stampers Insert into the main method: write_until_modified(&input_file_b, \"Test Test\")?; println!(\"\\nJ) Different stampers: expect only `read_task_b_modified` to execute\"); // Both `read_task_b_modified` and `read_task_b_exists` read from the same file, but they use different stampers. // Therefore, `read_task_b_modified` must be executed because the modified time has changed, but `read_task_b_exists` // will not be executed because its file dependency stamper only checks for existence of the file, and the existence // of the file has not changed. // // Note that using an `Exists` stamper for this task does not make a lot of sense, since it will only read the file // on first execute and when it is recreated. But this is just to demonstrate different stampers. let output = context.require_task(&read_task_b_modified)?; assert_eq!(&output, \"Test Test\"); let output = context.require_task(&read_task_b_exists)?; assert_eq!(&output, \"Test\"); Here we write to input_file_b and then require read_task_b_modified and read_task_b_exists. We expect read_task_b_modified to be executed, but read_task_b_exists to be skipped, because its file dependency only checks for the existence of the input file, which has not changed. This shows that tasks can depend on the same file with different stampers, which influences whether the tasks are affected by a file change individually. Of course, using an Exists stamper for ReadStringFromFile does not make a lot of sense, but this is for demonstration purposes only. Running cargo run --example incremental now should produce output like: Compiling pie v0.1.0 (/pie) Finished dev [unoptimized + debuginfo] target(s) in 0.81s Running `/pie/target/debug/examples/incremental`\nA) New task: expect `read_task` to execute\nReading from input.txt with Modified stamper B) Reuse: expect no execution C) Inconsistent file dependency: expect `read_task` to execute\nReading from input.txt with Modified stamper D) New task, reuse other: expect only `write_task` to execute\nWriting to output.txt with Modified stamper E) Inconsistent file and task dependency: expect both tasks to execute\nReading from input.txt with Modified stamper\nWriting to output.txt with Modified stamper F) Early cutoff: expect only `read_task` to execute\nReading from input.txt with Modified stamper G) Regenerate changed output file: expect only `write_task` to execute\nWriting to output.txt with Modified stamper H) Regenerate deleted output file: expect only `write_task` to execute\nWriting to output.txt with Modified stamper I) Different tasks: expect `read_task_b_modified` and `read_task_b_exists` to execute\nReading from input_b.txt with Modified stamper\nReading from input_b.txt with Exists stamper J) Different stampers: expect only `read_task_b_modified` to execute\nReading from input_b.txt with Modified stamper Feel free to experiment more with this example (or new example files) before continuing. In the next chapter, we will define minimality and soundness, set up an infrastructure for testing those properties, and fix issues uncovered by testing. Download source code You can download the source files up to this point .","breadcrumbs":"Incrementality » Incremental Top-Down Context » Exploring incrementality","id":"41","title":"Exploring incrementality"},"42":{"body":"So far, the definitions we've used for minimality (incrementality) and soundness (correctness) have been a bit vague. Let's define this more concretely and precisely. An incremental and sound build system executes a task, if and only if, it is new or affected by a change. A task is new if it has not been executed before. When it is not new, a task is affected by a change when any of its dependencies are inconsistent. A file dependency is inconsistent if its file stamp changes. A task dependency is inconsistent if, after recursively checking the task, its output stamp changes. The recursive nature of checking task dependencies ensures that indirect changes can affect tasks and cause them to be correctly executed. By defining minimality and soundness in terms of dependencies, a task author forgetting to create a dependency or not choosing the correct stamper, does not change whether our build system is minimal and sound. PIE works under the assumption that task authors correctly list all dependencies that mark their task as affected by a change when it actually is. Preventing task authoring mistakes It is of course possible to make mistakes when authoring tasks, for example by creating a dependency to the wrong file, or by forgetting to create a file dependency. Unfortunately, there is no easy way to solve this. We will be writing a build event tracking system later, for which we will make an implementation that writes the entire build log to standard output. This build log can help debug mistakes by precisely showing what the build system is doing. A technique to catch file dependency mistakes is by sandboxing the filesystem to only have access to files that have been required. For example, Bazel can perform sandboxing , but it is not fully cross-platform, and still allows reading files from absolute paths. If a cross-platform and bulletproof sandboxing library exists, it could help catch file dependency mistakes in programmatic incremental build systems. Finally, the ultimate technique to catch file dependency mistakes is by automatically creating these dependencies using filesystem tracing, instead of having the task author make them. For example, the Rattle build system uses fsatrace to automatically create file dependencies, freeing task authors from having to think about file dependencies However, filesystem tracing is also not fully cross-platform and bulletproof, so it cannot always be used. Again, if a cross-platform and bulletproof filesystem tracing library exists, it would be extremely useful for programmatic incremental build systems. In this chapter, we will show minimality and soundness by testing. However, before testing, we make minimality and soundness more precise by changing the API to work with sessions , and implement build event tracking that is needed for testing. We will continue as follows: Introduce sessions and change the API to work with sessions: Session type for performing builds in a session, and the Pie type as the entry point that manages sessions. Create infrastructure to track build events for testing and debugging purposes. Create the Tracker trait, and implement a WritingTracker for debugging and EventTracker for testing. Find a soundness hole where multiple tasks write to the same file. Fix it by tracking file write dependencies separately from read dependencies, and catch these mistakes with dynamic verification. Find a soundness hole where a task reads from a file before another task writes to it. Fix it by catching these mistakes with dynamic verification. Find a soundness hole where cyclic task execution can still occur. Fix it by changing how task dependencies are stored. Proving minimality and soundness? While proving minimality and soundness would be a very interesting exercise, I am not at all an expert in formal proofs in proof assistants such as Coq , Agda , etc. If that is something that interests you, do pursue it and get in touch!","breadcrumbs":"Minimality and Soundness » Minimality and Soundness","id":"42","title":"Minimality and Soundness"},"43":{"body":"A task is consistent if its dependencies are consistent, and consistency of file dependencies is based on the filesystem. However, the filesystem can change during a build, meaning that a task can be affected by multiple different changes in one build. For example, after executing a task, it could immediately be affected by a change in a source file again without the build system knowing about it, and that would not be minimal nor sound. Therefore, we will introduce the concept of a session . Builds are only performed in a session, and at most one session may exist at any given time. In one session, each task is checked or executed at most once , meaning that changes made to source files during a session are not guaranteed to be detected . The result is that if a task is deemed inconsistent at the time it is checked, it will be executed, and will not be checked nor executed any more that session. If a task is deemed consistent at the time it is checked, it will not be checked any more that session. This simplifies minimality and soundness, as we do not need to worry about checking tasks multiple times. Furthermore, it is also an optimisation, as requiring the same task many times only results in one check. We will implement the Session type to hold all session data, and the Pie type as an entry point into the build system that manages a session.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Minimality with Sessions","id":"43","title":"Minimality with Sessions"},"44":{"body":"Change the imports in pie/src/lib.rs: Now add the Pie and Session types to pie/src/lib.rs: /// Main entry point into PIE, a sound and incremental programmatic build system.\npub struct Pie<T, O> { store: Store<T, O>,\n} impl<T: Task> Default for Pie<T, T::Output> { fn default() -> Self { Self { store: Store::default() } }\n} impl<T: Task> Pie<T, T::Output> { /// Creates a new build session. Only one session may be active at once, enforced via mutable (exclusive) borrow. pub fn new_session(&mut self) -> Session<T, T::Output> { Session::new(self) } /// Runs `f` inside a new build session. pub fn run_in_session<R>(&mut self, f: impl FnOnce(Session<T, T::Output>) -> R) -> R { let session = self.new_session(); f(session) }\n} /// A session in which builds are executed.\npub struct Session<'p, T, O> { store: &'p mut Store<T, O>, current_executing_task: Option<TaskNode>, dependency_check_errors: Vec<io::Error>,\n} impl<'p, T: Task> Session<'p, T, T::Output> { fn new(pie: &'p mut Pie<T, T::Output>) -> Self { Self { store: &mut pie.store, current_executing_task: None, dependency_check_errors: Vec::default(), } } /// Requires `task`, returning its up-to-date output. pub fn require(&mut self, task: &T) -> T::Output { todo!(\"Create TopDownContext with this session, and require the task\") } /// Gets all errors produced during dependency checks. pub fn dependency_check_errors(&self) -> impl Iterator<Item=&io::Error> { self.dependency_check_errors.iter() }\n} We set up the types such that Pie owns the store, and Session owns all data for a build session that TopDownContext previously owned. We put the store in Pie because we want to keep the dependency graph and task outputs between build sessions, otherwise we cannot be incremental. A Session is created with Pie::new_session, which borrows Pie mutibly, ensuring that there can only be one Session instance (per Pie instance). run_in_session is a convenience method that runs given function inside a new session. Session::require should require the task with the top-down context and return its up-to-date output, which we will implement once we've changed TopDownContext. The dependency check errors can be accessed with Session::dependency_check_errors. Note that Session also has access to Store, because TopDownContext needs access to the store. The store is mutibly borrowed from Pie. Therefore, the Session struct is generic over the 'p lifetime, where the p stands for Pie. We can leave out this lifetime in Pie::new_session, because the compiler infers it from us, but we must be explicit in structs and most impls. Check that the code compiles (but gives warnings) with cargo check. Now we need to modify TopDownContext to work with Session.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » PIE and Session","id":"44","title":"PIE and Session"},"45":{"body":"Change TopDownContext to only contain a mutable reference to Session in pie/src/context/top_down.rs: Here, we use lifetime 's to denote the lifetime of a session, and make TopDownContext generic over it. new now just accepts a mutable reference to the session. The get_dependency_check_errors method can be removed. We add a require_initial convenience method for Session. In the rest of the file, we need to update the impl lines to include the lifetimes, and we need to replace most instances of self with self.session. You could do this with the following find-replace regex: self\\.([\\w\\d_]+)\\. -> self.session.$1. Change pie/src/context/top_down.rs: Now we change Session to use TopDownContext.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Update TopDownContext","id":"45","title":"Update TopDownContext"},"46":{"body":"Change pie/src/lib.rs: We reset the current_executing_task to None, to be sure that we start a build without an executing task. Then, we just create a TopDownContext and call require_initial. Finally, we can now make the context module private, as users of the library run builds using Session, instead of having to create a context implementation. Change pie/src/lib.rs: Check that the code compiles with cargo check --lib. This only checks if the library builds, but not any examples. We need to update the incrementality example to work with these changes.","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Update Session","id":"46","title":"Update Session"},"47":{"body":"First change some imports in pie/examples/incremental.rs: Then, change pie/examples/incremental.rs to use sessions: When we only require one task, we replace context.require_task with pie.new_session().require. When we want to require multiple tasks, we use new_session and call session.require multiple times. It is very important to create a new session each time in this example, because a task is only checked/executed once each session. If we use a single session, our changes are never seen, and we just execute each task once, which is not what we want. Therefore, every time we make changes to source files, or expect that changes have been made to source files, we must create a new session. Note In changes I and J, Rust is smart enough to allow creating a new session even though the previous session variable is still active, because it knows that we don't use that previous session anymore. Check that all code works by running cargo test. With this new API in place, and all code adjusted to work with it, we can continue with tracking build events. Download source code You can download the source files up to this point .","breadcrumbs":"Minimality and Soundness » Minimality with Sessions » Update incremental example","id":"47","title":"Update incremental example"},"48":{"body":"So far we have had no convenient way to inspect what our build system is doing, apart from println! debugging or attaching a debugger to the program. In this section, we will change that by tracking build events for debugging and integration testing purposes. We will: Create a Tracker trait that receives build events through method calls. The Tracker trait can be implemented in different ways to handle build events in different ways. Implement a NoopTracker that does nothing, removing the tracking overhead. Make the build system generic over Tracker, such that Context implementations call methods on the tracker to create build events. Implement a WritingTracker that writes build events to standard output or standard error, for debugging purposes. Implement an EventTracker that stores build events for later inspection, for integration testing purposes. Implement a CompositeTracker that forwards build events to 2 other trackers, so we can use multiple trackers at the same time.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Tracking Build Events","id":"48","title":"Tracking Build Events"},"49":{"body":"Add the tracker module to pie/src/lib.rs: Then create the pie/src/tracker directory, create the pie/src/tracker/mod.rs file, and add the following content: use std::path::Path; use crate::stamp::{FileStamp, FileStamper, OutputStamp, OutputStamper};\nuse crate::Task; /// Trait for tracking build events. Can be used to implement logging, event tracing, progress tracking, metrics, etc.\n#[allow(unused_variables)]\npub trait Tracker<T: Task> { /// Start a new build. fn build_start(&mut self) {} /// A build has been completed. fn build_end(&mut self) {} /// A file at `path` has been required, using `stamper` to create `stamp`. fn required_file(&mut self, path: &Path, stamper: &FileStamper, stamp: &FileStamp) {} /// Require `task` using `stamper`. fn require_task(&mut self, task: &T, stamper: &OutputStamper) {} /// A `task` has been required, resulting in consistent `output`, using `stamper` to create `stamp`, and task /// `was_executed`. fn required_task(&mut self, task: &T, output: &T::Output, stamper: &OutputStamper, stamp: &OutputStamp<T::Output>, was_executed: bool) {} /// Execute `task`. fn execute(&mut self, task: &T) {} /// A `task` has been executed, producing `output`. fn executed(&mut self, task: &T, output: &T::Output) {}\n} The Tracker trait is generic over Task. Note Here, we chose to put the Task constraint on the trait itself. This will not lead to cascading constraints, as the Tracker trait will only be used as a constraint in impls, not in structs or other traits. Tracker has methods corresponding to events that happen during a build, such as a build starting or ending, requiring a file, requiring a task, and executing a task. These methods accept &mut self so that tracker implementations can perform mutation, such as storing a build event. We provide default methods that do nothing so that implementors of Tracker only have to override the methods for events they are interested in. We use #[allow(unused_variables)] on the trait to not give warnings for unused variables, as all variables are unused due to the empty default implementations. Default methods Adding a method to Tracker with a default implementation ensures that implementations of Tracker do not have to be changed to work with the new method. This is both good and bad. Good because we can add methods without breaking compatibility. Bad because we can forget to handle a new method, which can lead to problems with for example a composite tracker that forwards events to 2 trackers. In this tutorial we chose the convenient option, but be sure to think about these kind of tradeoffs yourself! Check that the code compiles with cargo test.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Tracker trait","id":"49","title":"Tracker trait"},"5":{"body":"Implement the non-incremental context in pie/src/context/non_incremental.rs by adding: use crate::{Context, Task}; pub struct NonIncrementalContext; impl<T: Task> Context<T> for NonIncrementalContext { fn require_task(&mut self, task: &T) -> T::Output { task.execute(self) }\n} This NonIncrementalContext is extremely simple: in require_task we unconditionally execute the task, and pass self along so the task we're calling can require additional tasks. Let's write some tests to see if this does what we expect. Rust Help In Rust, libraries are called crates . We import the Context and Task traits from the root of your crate (i.e., the src/lib.rs file) using crate:: as a prefix. Structs are concrete types that can contain data through fields and implement traits, similar to classes in class-oriented languages. Since we don't need any data in NonIncrementalContext, we define it as a unit-like struct . Traits are implemented for a type with impl Context for NonIncrementalContext { ... }, where we then have to implement all methods and associated types of the trait. The Context trait is generic over Task, so in the impl block we introduce a type parameter T with impl<T>, and use trait bounds as impl<T: Task> to declare that T must implement Task. The last expression of a function – in this case task.execute(self) in require_task which is an expression because it does not end with ; – is used as the return value. We could also write that as return task.execute(self);, but that is more verbose.","breadcrumbs":"Programmability » Non-Incremental Context » Implementation","id":"5","title":"Implementation"},"50":{"body":"Add a no-op tracker, which is a tracker that does nothing, by adding the following code to pie/src/tracker/mod.rs: /// [`Tracker`] that does nothing.\n#[derive(Copy, Clone, Debug)]\npub struct NoopTracker;\nimpl<T: Task> Tracker<T> for NoopTracker {} Due to the default methods that do nothing on Tracker, this implementation is extremely simple. Removing tracker overhead We will use generics to select which tracker implementation to use. Therefore, all calls to trackers are statically dispatched, and could be inlined. Because NoopTracker only has empty methods, and those empty methods can be inlined, using NoopTracker will effectively remove all tracking code from your binary, thus removing the overhead of tracking if you don't want it. In this tutorial, we do not annotate methods with #[inline] , meaning that the Rust compiler (and the LLVM backend) will make its own decisions on what to make inlineable and what not. If you care about performance here, be sure to annotate those default empty methods with #[inline].","breadcrumbs":"Minimality and Soundness » Tracking Build Events » No-op tracker","id":"50","title":"No-op tracker"},"51":{"body":"Now we will make the build system generic over Tracker, and insert Tracker calls in context implementations. Make Pie and Session generic over Tracker by modifying pie/src/lib.rs: We use A as the generic argument for tracker types in the source code. The Pie struct owns the tracker, similarly to how it owns the store. Pie can be created with a specific tracker with with_tracker, and provides access to the tracker with tracker and tracker_mut. Default type We assign NoopTracker as the default type for trackers in Pie, so that no tracking is performed when we use the Pie type without an explicit tracker type. The Default implementation only works with NoopTracker, because we impl Default for Pie<T, T::Output>, which is equivalent to impl Default for Pie<T, T::Output, NoopTracker> due to the default type. We make Session generic over trackers, and mutibly borrow the tracker from Pie, again like we do with the store. For convenience, Session also provides access to the tracker with tracker and tracker_mut. Now we make TopDownContext generic over Tracker, and insert calls to tracker methods. Modify pie/src/context/top_down.rs: We make TopDownContext generic over trackers, and call methods on the tracker: build_start/build_end in require_initial to track build start and ends, required_file in require_file_with_stamper to track file dependencies, require_task/required_task in require_file_with_stamper to track task dependencies, execute/executed in require_task_with_stamper to track task execution start and ends. In require_file_with_stamper, we also extract should_execute into a variable, and pull dependency out of the if, so that we can pass the required data to tracker.required_task. Check that the code compiles with cargo test. Existing code should keep working due to the NoopTracker default type in Pie. We won't modify NonIncrementalContext to use a tracker, as NonIncrementalContext has no state, so we cannot pass a tracker to it.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Using the Tracker trait","id":"51","title":"Using the Tracker trait"},"52":{"body":"Now we can implement some interesting trackers. We start with a simple WritingTracker that writes build events to some writer. Add the writing module to pie/src/tracker/mod.rs: Then create the pie/src/tracker/writing.rs file and add: use std::io::{self, BufWriter, Stderr, Stdout, Write}; use crate::stamp::{OutputStamp, OutputStamper};\nuse crate::Task;\nuse crate::tracker::Tracker; /// [`Tracker`] that writes events to a [`Write`] instance, for example [`Stdout`].\n#[derive(Clone, Debug)]\npub struct WritingTracker<W> { writer: W, indentation: u32,\n} impl WritingTracker<BufWriter<Stdout>> { /// Creates a [`WritingTracker`] that writes to buffered standard output. pub fn with_stdout() -> Self { Self::new(BufWriter::new(io::stdout())) }\n}\nimpl WritingTracker<BufWriter<Stderr>> { /// Creates a [`WritingTracker`] that writes to buffered standard error. pub fn with_stderr() -> Self { Self::new(BufWriter::new(io::stderr())) }\n}\nimpl<W: Write> WritingTracker<W> { /// Creates a [`WritingTracker`] that writes to `writer`. pub fn new(writer: W) -> Self { Self { writer, indentation: 0, } }\n} The WritingTracker is generic over a writer W that must implement Write, which is a standard trait for writing bytes to something. with_stdout and with_stderr can be used to create buffered writers to standard output and standard error. new can be used to create a writer to anything that implements Write, such as a File. Add the Tracker implementation to pie/src/tracker/writing.rs: impl<W: Write, T: Task> Tracker<T> for WritingTracker<W> { fn required_task(&mut self, task: &T, _output: &T::Output, _stamper: &OutputStamper, _stamp: &OutputStamp<T::Output>, was_executed: bool) { if !was_executed { self.writeln(format_args!(\"✓ {:?}\", task)); self.flush(); } } fn execute(&mut self, task: &T) { self.writeln(format_args!(\"→ {:?}\", task)); self.indent(); self.flush(); } fn executed(&mut self, _task: &T, output: &T::Output) { self.unindent(); self.writeln(format_args!(\"← {:?}\", output)); self.flush(); }\n} #[allow(dead_code)]\nimpl<W: Write> WritingTracker<W> { fn writeln(&mut self, args: std::fmt::Arguments) { self.write_indentation(); writeln!(&mut self.writer, \"{}\", args).ok(); } fn write(&mut self, args: std::fmt::Arguments) { write!(&mut self.writer, \"{}\", args).ok(); } fn write_nl(&mut self) { write!(&mut self.writer, \"\\n\").ok(); } fn indent(&mut self) { self.indentation = self.indentation.saturating_add(1); } fn unindent(&mut self) { self.indentation = self.indentation.saturating_sub(1); } fn write_indentation(&mut self) { for _ in 0..self.indentation { write!(&mut self.writer, \" \").ok(); } } fn flush(&mut self) { self.writer.flush().ok(); }\n} We implement 3 tracker methods that write when: ✓: a task is required but was not executed (i.e., consistent), →: a task starts to execute, ←: when the task is done executing. The text to write is formatted with format_args!, which is passed into writeln using std::fmt::Arguments for flexibility. We flush the writer after every event to ensure that bytes are written out. When a task starts to execute, we increase indentation to signify the recursive checking/execution. When a task is done executing, we decrease the indentation again. Saturating arithmetic We use saturating_add and saturating_sub for safety, which are saturating arithmetic operations that saturate at the numeric bounds instead of overflowing. For example, 0u32.saturating_sub(1) will result in 0 instead of overflowing into 4294967295. These saturating operations are not really needed when calls to indent and unindent are balanced. However, if we make a mistake, it is better to write no indentation than to write 4294967295 spaces of indentation. Alternatively, we could use standard arithmetic operations, which panic on overflow in debug/development mode, but silently overflow in release mode. Failing writes Writes can fail, but we silently ignore them in this tutorial (with let _ = ...) for simplicity. You could panic when writing fails, but panicking when writing to standard output fails is probably going a bit too far. You could store the latest write error and give access to it, which at least allows users of WritingTracker check for some errors. In general, tracking events can fail, but the current Tracker API does not allow for propagating these errors with Result. This in turn because TopDownContext does not return Result for require_task due to the trade-offs discussed in the section on TopDownContext. If you want, you can capture more build events and write them, and/or provide more configuration as to what build events should be written. But in this tutorial, we will keep it simple like this. Check that the code compiles with cargo test. Let's try out our writing tracker in the incrementality example by modifying pie/examples/incremental.rs: We remove the println! statements from tasks and create Pie with WritingTracker. Now run the example with cargo run --example incremental, and you should see the writing tracker print consistent tasks and task executions to standard output.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Implement writing tracker","id":"52","title":"Implement writing tracker"},"53":{"body":"The writing tracker is great for debugging purposes, but we cannot use it to check whether our build system is incremental and sound. To check incrementality and soundness, we need to be able to check whether a task has executed or not, and check the order of build events. Therefore, we will implement the EventTracker that stores build events for later inspection. Add the event module to pie/src/tracker/mod.rs: Then create the pie/src/tracker/event.rs file and add: use std::path::{Path, PathBuf}; use crate::stamp::{FileStamp, FileStamper, OutputStamp, OutputStamper};\nuse crate::Task;\nuse crate::tracker::Tracker; /// [`Tracker`] that stores [events](Event) in a [`Vec`], useful in testing to assert that a context implementation is /// incremental and sound.\n#[derive(Clone, Debug)]\npub struct EventTracker<T: Task> { events: Vec<Event<T>>,\n} impl<T: Task> Default for EventTracker<T> { fn default() -> Self { Self { events: Vec::new() } }\n} /// Enumeration of important build events.\n#[derive(Debug, Clone)]\npub enum Event<T: Task> { /// A file at `path` has been required, using `stamper` to create `stamp`. RequiredFile { path: PathBuf, stamper: FileStamper, stamp: FileStamp }, /// Require `task` using `stamper`. RequireTask { task: T, stamper: OutputStamper }, /// A `task` has been required, resulting in consistent `output`, using `stamper` to create `stamp`, and task /// `was_executed`. RequiredTask { task: T, output: T::Output, stamper: OutputStamper, stamp: OutputStamp<T::Output>, was_executed: bool }, /// Execute `task`. Execute { task: T }, /// A `task` has been executed, producing `output`. Executed { task: T, output: T::Output },\n} The EventTracker stores build events in a Vec. The Event enumeration mimics the Tracker methods, but has all arguments in owned form (for example task: T instead of task: &T) as we want to store these events. Add the tracker implementation to pie/src/tracker/event.rs: impl<T: Task> Tracker<T> for EventTracker<T> { fn build_start(&mut self) { self.events.clear(); } fn required_file(&mut self, path: &Path, stamper: &FileStamper, stamp: &FileStamp) { self.events.push(Event::RequiredFile { path: path.to_path_buf(), stamper: *stamper, stamp: *stamp }); } fn require_task(&mut self, task: &T, stamper: &OutputStamper) { self.events.push(Event::RequireTask { task: task.clone(), stamper: stamper.clone() }); } fn required_task(&mut self, task: &T, output: &T::Output, stamper: &OutputStamper, stamp: &OutputStamp<T::Output>, was_executed: bool) { self.events.push(Event::RequiredTask { task: task.clone(), output: output.clone(), stamper: *stamper, stamp: stamp.clone(), was_executed }); } fn execute(&mut self, task: &T) { self.events.push(Event::Execute { task: task.clone() }); } fn executed(&mut self, task: &T, output: &T::Output) { self.events.push(Event::Executed { task: task.clone(), output: output.clone() }); }\n} We implement the relevant methods from Tracker and store the build events as Event instances in self.events. When a new build starts, we clear the events. Now we will add code to inspect the build events. This is quite a bit of code that we will be using in integration testing to test incrementality and soundness. We'll add in one go to keep the tutorial going, and we will use this code in the next section, but feel free to take some time to inspect the code. Add the following code to pie/src/tracker/event.rs: impl<T: Task> EventTracker<T> { /// Returns a slice over all events. pub fn slice(&self) -> &[Event<T>] { &self.events } /// Returns an iterator over all events. pub fn iter(&self) -> impl Iterator<Item=&Event<T>> { self.events.iter() } /// Returns `true` if `predicate` returns `true` for any event. pub fn any(&self, predicate: impl FnMut(&Event<T>) -> bool) -> bool { self.iter().any(predicate) } /// Returns the number of times `predicate` returns `true`. pub fn count(&self, predicate: impl FnMut(&&Event<T>) -> bool) -> usize { self.iter().filter(predicate).count() } /// Returns `true` if `predicate` returns `true` for exactly one event. pub fn one(&self, predicate: impl FnMut(&&Event<T>) -> bool) -> bool { self.count(predicate) == 1 } /// Returns `Some(index)` for the first event `e` where `predicate(e)` returns `true`, or `None` otherwise. pub fn index_of(&self, predicate: impl FnMut(&Event<T>) -> bool) -> Option<usize> { self.iter().position(predicate) } /// Returns `Some(v)` for the first event `e` where `f(e)` returns `Some(v)`, or `None` otherwise. pub fn find_map<R>(&self, f: impl FnMut(&Event<T>) -> Option<&R>) -> Option<&R> { self.iter().find_map(f) } /// Returns `Some((index, v))` for the first event `e` where `f(e)` returns `Some(v)`, or `None` otherwise. pub fn index_find_map<R>(&self, mut f: impl FnMut(&Event<T>) -> Option<&R>) -> Option<(usize, &R)> { self.iter().enumerate().find_map(|(i, e)| f(e).map(|o| (i, o))) } /// Finds the first [required file event](Event::RequiredFile) for `path` and returns its stamp as `Some(stamp)`, or /// `None` if no event was found. pub fn stamp_of_first_required_file(&self, path: &PathBuf) -> Option<&FileStamp> { self.find_map(|e| e.stamp_of_required_file(path)) } /// Returns `true` if any task was executed. pub fn any_execution(&self) -> bool { self.any(|e| e.is_execution()) } /// Returns `true` if `task` was executed. pub fn any_execution_of(&self, task: &T) -> bool { self.any(|e| e.is_execution_of(task)) } /// Returns `true` if `task` was executed exactly once. pub fn one_execute_of(&self, task: &T) -> bool { self.one(|e| e.is_execute(task)) } /// Finds the first [task execute event](Event::Execute) for `task` and returns its index as `Some(index)`, or `None` /// if no event was found. pub fn index_of_first_execute(&self, task: &T) -> Option<usize> { self.index_of(|e| e.is_execute(task)) } /// Finds the first [task executed event](Event::Executed) for `task` and returns its index as `Some(index)`, or /// `None` if no event was found. pub fn index_of_first_executed(&self, task: &T) -> Option<usize> { self.index_of(|e| e.output_of_executed(task).is_some()) } /// Finds the first [task executed event](Event::Executed) for `task` and returns its index and output as /// `Some((index, output))`, or `None` if no event was found. pub fn index_output_of_first_executed(&self, task: &T) -> Option<(usize, &T::Output)> { self.index_find_map(|e| e.output_of_executed(task)) }\n} impl<T: Task> Event<T> { /// Returns `Some(stamp)` if this is a [required file event](Event::RequiredFile) for file at `path`, or `None` /// otherwise. pub fn stamp_of_required_file(&self, path: &PathBuf) -> Option<&FileStamp> { match self { Event::RequiredFile { path: p, stamp, .. } if p == path => Some(stamp), _ => None, } } /// Returns `true` if this is a task execution (execute or executed) event. pub fn is_execution(&self) -> bool { match self { Event::Execute { .. } => true, Event::Executed { .. } => true, _ => false, } } /// Returns `true` if this is an execution (execute or executed) event for `task`. pub fn is_execution_of(&self, task: &T) -> bool { match self { Event::Execute { task: t } if t == task => true, Event::Executed { task: t, .. } if t == task => true, _ => false, } } /// Returns `true` if this is a [task execute event](Event::Execute) for `task`. pub fn is_execute(&self, task: &T) -> bool { match self { Event::Execute { task: t } if t == task => true, _ => false, } } /// Returns `Some(output)` if this is a [task executed event](Event::Executed) for `task`, or `None` otherwise. pub fn output_of_executed(&self, task: &T) -> Option<&T::Output> { match self { Event::Executed { task: t, output: o } if t == task => Some(o), _ => None, } }\n} We add several general inspection methods to EventTracker: slice and iter provide raw access to all stored Events, any, count, and one are for checking predicates over all events, index_of for finding the index of the first event given a predicate, find_map and index_find_map for finding the first event given some function, returning the output (and also index in index_find_map) of that function. We add methods for specific kinds of events, following the general methods. Finally, we add convenience methods to Event for checking specific kinds of events. Check that the code compiles with cargo test.","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Implement event tracker","id":"53","title":"Implement event tracker"},"54":{"body":"Currently, we cannot use both EventTracker and WritingTracker at the same time. We want this so that we can check incrementality and soundness, but also look at standard output for debugging, at the same time. Therefore, we will implement a CompositeTracker that forwards build events to 2 trackers. Add the following code to pie/src/tracker/mod.rs: /// [`Tracker`] that forwards build events to 2 trackers.\n#[derive(Copy, Clone, Debug)]\npub struct CompositeTracker<A1, A2>(pub A1, pub A2);\nimpl<T: Task, A1: Tracker<T>, A2: Tracker<T>> Tracker<T> for CompositeTracker<A1, A2> { fn build_start(&mut self) { self.0.build_start(); self.1.build_start(); } fn build_end(&mut self) { self.0.build_end(); self.1.build_end(); } fn required_file(&mut self, path: &Path, stamper: &FileStamper, stamp: &FileStamp) { self.0.required_file(path, stamper, stamp); self.1.required_file(path, stamper, stamp); } fn require_task(&mut self, task: &T, stamper: &OutputStamper) { self.0.require_task(task, stamper); self.1.require_task(task, stamper); } fn required_task(&mut self, task: &T, output: &T::Output, stamper: &OutputStamper, stamp: &OutputStamp<T::Output>, was_executed: bool) { self.0.required_task(task, output, stamper, stamp, was_executed); self.1.required_task(task, output, stamper, stamp, was_executed); } fn execute(&mut self, task: &T) { self.0.execute(task); self.1.execute(task); } fn executed(&mut self, task: &T, output: &T::Output) { self.0.executed(task, output); self.1.executed(task, output); }\n} CompositeTracker is a tuple struct containing 2 trackers that implements all tracker methods and forwards them to the 2 contained trackers. Its tuple fields are pub so it can be constructed with CompositeTracker(t1, t2) and the contained trackers can be accessed with c.0 and c.1. Check that the code compiles with cargo test. Now that the build event tracking infrastructure is in place, we can start integration testing! Download source code You can download the source files up to this point .","breadcrumbs":"Minimality and Soundness » Tracking Build Events » Implement composite tracker","id":"54","title":"Implement composite tracker"},"6":{"body":"Add the following test to pie/src/context/non_incremental.rs: #[cfg(test)]\nmod test { use super::*; #[test] fn test_require_task_direct() { #[derive(Clone, PartialEq, Eq, Hash, Debug)] struct ReturnHelloWorld; impl Task for ReturnHelloWorld { type Output = String; fn execute<C: Context<Self>>(&self, _context: &mut C) -> Self::Output { \"Hello World!\".to_string() } } let mut context = NonIncrementalContext; assert_eq!(\"Hello World!\", context.require_task(&ReturnHelloWorld)); }\n} In this test, we create a struct ReturnHelloWorld which is the \"hello world\" of the build system. We implement Task for it, set its Output associated type to be String, and implement the execute method to just return \"Hello World!\". We derive the Clone, Eq, Hash, and Debug traits for ReturnHelloWorld as they are required for all Task implementations. We require the task with our context by creating a NonIncrementalContext, calling its require_task method, passing in a reference to the task. It returns the output of the task, which we test with assert_eq!. Run the test by running cargo test. The output should look something like: Compiling pie v0.1.0 (/pie) Finished test [unoptimized + debuginfo] target(s) in 0.47s Running unittests src/lib.rs (/pie/target/debug/deps/pie-6c9d55a7ef727e00) running 1 test\ntest context::non_incremental::test::test_require_task_direct ... ok test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Doc-tests pie running 0 tests test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Which indicates that the test indeed succeeds! You can experiment by returning a different string from ReturnHelloWorld::execute to see what a failed test looks like. Rust Help Unit tests for a module are typically defined by creating a nested module named test with the #[cfg(test)] attribute applied to it. In that test module, you apply #[test] to testing functions, which then get executed when you run cargo test. The #[cfg(...)] attribute provides conditional compilation for the item it is applied to. In this case, #[cfg(test)] ensures that the module is only compiled when we run cargo test. We import all definitions from the parent module (i.e., the non_incremental module) into the test module with use super::*;. In Rust, items — that is, functions, structs, implementations, etc. — can be nested inside functions. We use that in test_require_task_direct to scope ReturnHelloWorld and its implementation to the test function, so it can't clash with other test functions. In execute, we use _context as the parameter name for the context, as the parameter is unused. Unused parameters give a warning in Rust, unless it is prefixed by a _. assert_eq! is a macro that checks if its two expressions are equal. If not, it panics . This macro is typically used in tests for assertions, as a panic marks a test as failed.","breadcrumbs":"Programmability » Non-Incremental Context » Simple Test","id":"6","title":"Simple Test"},"7":{"body":"Our first test only tests a single task that does not use the context, so let's write a test with two tasks where one requires the other to increase our test coverage. Add the following test: We use the same ReturnHelloWorld task as before, but now also have a ToLowerCase task which requires ReturnHelloWorld and then turn its string lowercase. However, due to the way we've set up the types between Task and Context, we will run into a problem. Running cargo test, you should get these errors: Compiling pie v0.1.0 (/pie)\nerror[E0308]: mismatched types --> src/context/non_incremental.rs:46:30 |\n46 | context.require_task(&ReturnHelloWorld).to_lowercase() | ------------ ^^^^^^^^^^^^^^^^^ expected `&ToLowerCase`, found `&ReturnHelloWorld` | | | arguments to this method are incorrect | = note: expected reference `&ToLowerCase` found reference `&non_incremental::test::test_require_task_problematic::ReturnHelloWorld`\nnote: method defined here --> src/lib.rs:18:6 |\n18 | fn require_task(&mut self, task: &T) -> T::Output; | ^^^^^^^^^^^^ For more information about this error, try `rustc --explain E0308`.\nerror: could not compile `pie` (lib test) due to previous error The problem is that execute of ToLowerCase takes a Context<Self>, so in impl Task for ToLowerCase it takes a Context<ToLowerCase>, while we're trying to require &ReturnHelloWorld through the context. This doesn't work as Context<ToLowerCase>::require_task only takes a &ToLowerCase as input. We could change execute of ToLowerCase to take Context<ReturnHelloWorld>: But that is not allowed: Compiling pie v0.1.0 (/pie)\nerror[E0276]: impl has stricter requirements than trait --> src/context/non_incremental.rs:45:21 |\n45 | fn execute<C: Context<ReturnHelloWorld>>(&self, context: &mut C) -> Self::Output { | ^^^^^^^^^^^^^^^^^^^^^^^^^ impl has extra requirement `C: Context<non_incremental::test::test_require_task_problematic::ReturnHelloWorld>` | ::: src/lib.rs:11:3 |\n11 | fn execute<C: Context<Self>>(&self, context: &mut C) -> Self::Output; | --------------------------------------------------------------------- definition of `execute` from trait For more information about this error, try `rustc --explain E0276`.\nerror: could not compile `pie` (lib test) due to previous error This is because the Task trait defines execute to take a Context<Self>, thus every implementation of Task must adhere to this, so we can't solve it this way. Effectively, due to the way we defined Task and Context, we can only use a single task implementation . However, there is a good reason for this which will become more apparent once we implement incrementality. Why only a single Task type? The gist of it is that an incremental context wants to build a single dependency graph and cache task outputs, so that we can figure out from the graph whether a task is affected by a change, and just return its output if it is not affected. Therefore, a context implementation will maintain a Store<T>. A Context<ReturnHelloWorld> and Context<ToLowerCase> would then have a Store<ReturnHelloWorld> and Store<ToLowerCase> respectively. These two stores would then maintain two different dependency graphs, one where the nodes in the graph are ReturnHelloWorld and one where the nodes are ToLowerCase. But that won't work, as we need a single dependency graph over all tasks to figure out what is affected. There are several solutions to this problem. For example, we could use trait objects . However, this introduces a whole slew of problems because many traits that we use are not trait-object safe. Clone is not object safe because it requires Sized. Eq is not object safe because it uses Self. Serializing trait-objects is problematic. There are workarounds for all these things, but it is not pretty and very complicated. Another solution would be to encapsulate different tasks into a single type, using (procedural) macros to automatically generate this single task type. This solution is more feasible, but still introduces a lot of complexity which is not worth it in this tutorial. Therefore, in this tutorial we will keep it simple. For now, we will solve this by just using a single task type which is an enumeration of the different possible tasks. Replace the test with the following: Here, we instead define a single task Test which is an enum with two variants. In its Task implementation, we match ourselves and return \"Hello World!\" when the variant is ReturnHelloWorld. When the variant is ReturnHelloWorld, we require &Self::ReturnHelloWorld through the context, which is now valid because it is an instance of Test, and turn its string lowercase and return that. This now works due to only having a single task type. Run the test with cargo test to confirm it is working. Rust Help Enums define a type by a set of variants, similar to enums in other languages, sometimes called tagged unions in other languages. The match expression matches the variant and dispatches based on that, similar to switch statements in other languages. We have defined the API for the build system and implemented a non-incremental version of it. We're now ready to start implementing an incremental context in the next chapter. Download source code You can download the source files up to this point .","breadcrumbs":"Programmability » Non-Incremental Context » Test with Multiple Tasks","id":"7","title":"Test with Multiple Tasks"},"8":{"body":"In this chapter, we will implement an incremental build context. An incremental context selectively executes tasks — only those that are affected by a change. In other words, an incremental context executes the minimum number of tasks required to make all tasks up-to-date. However, due to dynamic dependencies, this is not trivial. We cannot first gather all tasks into a dependency tree and then topologically sort that, as dependencies are added and removed while tasks are executing . To do incremental builds in the presence of dynamic dependencies, we need to check and execute affected tasks one at a time, updating the dependency graph, while tasks are executing . To achieve this, we will employ a technique called top-down incremental building , where we start checking if a top (root) task needs to be executed, and recursively check whether dependent tasks should be executed until we reach the bottom (leaf) task(s), akin to a depth-first search. Furthermore, build systems almost always interact with the file system in some way. For example, tasks read configuration and source files, or write intermediate and binary files. Thus, a change in a file can affect a task that reads it, and executing a task can result in writing to new or existing files. Therefore, we will also keep track of file dependencies . Like task dependencies, file dependencies are also tracked dynamically while tasks are executing. There are several ways to check if a file dependency is consistent (i.e., has not changed), such as checking the last modification date, or comparing a hash. To make this configurable on a per-dependency basis, we will implement stamps . A file stamp is just a value that is produced from a file, such as the modification date or hash, that is stored with the file dependency. To check if a file dependency is consistent, we just stamp the file again and compare it with the stored stamp. Similarly, we can employ stamps for task dependencies as well by stamping the output of a task. To achieve incrementality, we will continue with these steps in the following sections: Extend Context with a method to require a file , enabling tasks to specify dynamic dependencies to files. Implement file stamps and task output stamps , and extend Context with methods to select stampers , enabling tasks to specify when a dependency is consistent. Implement dynamic dependencies and their consistency checking . Implement a dependency graph store with methods to query and mutate the dependency graph. Implement the top-down incremental context that incrementally executes tasks.","breadcrumbs":"Incrementality » Introduction","id":"8","title":"Introduction"},"9":{"body":"Since build systems frequently interact with files, and changes to files can affect tasks, we need to keep track of file dependencies. Therefore, we will extend the Context API with methods to require files , enabling tasks to specify dynamic dependencies to files. Add a method to the Context trait in pie/src/lib.rs: require_file is similar to requiring a task, but instead takes a path to a file or directory on the filesystem as input. We use AsRef<Path> as the type for the path, so that we can pass anything in that can dereference to a path. For example, str has an AsRef<Path> implementation, so we can just use \"test.txt\" as a path. As an output, we return Result<Option<File>, io::Error>, with File being a handle to an open file. The reason for this complicated type is: An incremental context will want to read the metadata (such as the last modified date) of the file, or create a hash over the file, to be able to detect changes. Because getting metadata or reading the file can fail, and we want to propagate this error, we return a Result with io::Error as the error type. Tasks can create a dependency to a file that does not exist, and the existence of that file affects the task. For example, a task that prints true or false based on if a file exists. If the file does not exist (or it is a directory), we cannot open it, so we cannot return a File, hence we use Option<File> to return None. Otherwise, we return Ok(Some(file)) so that the task can read the opened file. Rust Help Recoverable error handling in Rust is done with the Result<T, E> type, which can either be Ok(t) or Err(e). In contrast to many languages which use exceptions, throwing, and exception handling; Rust treats recoverable errors just as regular values. Similarly, optional values in Rust are defined using the Option<T> type, which can either be Some(t) or None. Rust has many traits for converting values or references into others, which provides a lot of convenience in what would otherwise require a lot of explicit conversions. AsRef<T> is such a conversion trait, that can convert itself into &T. Here, we use AsRef<Path> as a generic with a trait bound to support many different kinds of values to the path argument in require_file. For example, we can call context.require_file(\"test.txt\") because str, which is the type of string constants, implements AsRef<Path> . You can also see this as a kind of method overloading, without having to provide concrete overloads for all supported types. Now we need to implement this method for NonIncrementalContext. However, because we will be performing similar file system operations in the incremental context as well, we will create some utility functions for this first. Add the fs module to pie/src/lib.rs: Create file pie/src/fs.rs with: use std::{fs, io};\nuse std::fs::{File, Metadata};\nuse std::path::Path; /// Gets the metadata for given `path`, returning:\n/// - `Ok(Some(metadata))` if a file or directory exists at given path,\n/// - `Ok(None)` if no file or directory exists at given path,\n/// - `Err(e)` if there was an error getting the metadata for given path.\npub fn metadata(path: impl AsRef<Path>) -> Result<Option<Metadata>, io::Error> { match fs::metadata(path) { Err(e) if e.kind() == io::ErrorKind::NotFound => Ok(None), Err(e) => Err(e), Ok(m) => Ok(Some(m)) }\n} /// Attempt to open file at given `path`, returning:\n/// - `Ok(Some(file))` if the file exists at given path, /// - `Ok(None)` if no file exists at given path (but a directory could exist at given path),\n/// - `Err(e)` if there was an error getting the metadata for given path, or if there was an error opening the file.\n///\n/// This function is necessary due to Windows returning an error when attempting to open a directory.\npub fn open_if_file(path: impl AsRef<Path>) -> Result<Option<File>, io::Error> { let file = match metadata(&path)? { Some(metadata) if metadata.is_file() => Some(File::open(&path)?), _ => None, }; Ok(file)\n} The metadata function gets the filesystem metadata given a path, and open_if_file opens the file for given path. The reason for these functions is that the standard library function std::fs::metadata treats non-existent files as an error, whereas we don't want to treat it as an error and just return None. Furthermore, open_if_file works around an issue where opening a directory on Windows (and possibly other operating systems) is an error, where we want to treat it as None again. The documentation comments explain the exact behaviour. Rust Help The ? operator makes it easy to propgate errors . Because errors are just values in Rust, to propgate an error, you'd normally have to match each result and manually propagate the error. The r? operator applied to a Result r does this for you, it basically desugars to something like match r { Err(e) => return Err(e), _ => {} }. Comments with three forward slashes /// are documentation comments that document the function/struct/enum/trait/etc. they are applied to. We will write some tests to confirm the behaviour, but for that we need utilities to create temporary files and directories. Furthermore, we will be writing more unit tests, integration tests, and even benchmarks in this tutorial, so we will set up these utilities in such a way that they are reachable by all these use cases. The only way to do that in Rust right now, is to create a separate crate and have the pie crate depend on it. And yes, we went from adding file dependencies, to creating file system utilities, to testing those file system utilities, to creating testing utilities, and now to making a crate for those testing utilities. Sorry about that 😅, we will start unwinding this stack soon! Next to the pie directory, create a directory named dev_shared. Create the dev_shared/Cargo.toml file with the following contents: [package]\nname = \"dev_shared\"\nversion = \"0.1.0\"\nedition = \"2021\" [dependencies]\ntempfile = \"3\" We've added the tempfile dependency here already, which is a crate that creates and automatically cleans up temporary files and directories. Rust Help We use other libraries (crates) by specifying dependencies . Because basically every Rust library adheres to semantic versioning , we can use \"3\" as a version requirement which indicates that we will use the most up-to-date 3.x.x version. Create the main library file dev_shared/src/lib.rs, with functions for creating temporary files and directories: use std::io; use tempfile::{NamedTempFile, TempDir}; /// Creates a new temporary file that gets cleaned up when dropped.\npub fn create_temp_file() -> Result<NamedTempFile, io::Error> { NamedTempFile::new() } /// Creates a new temporary directory that gets cleaned up when dropped.\npub fn create_temp_dir() -> Result<TempDir, io::Error> { TempDir::new() } Your directory structure should now look like this: ├── pie\n│ ├── src\n│ │ ├── lib.rs\n│ │ ├── context\n│ │ │ ├── mod.rs\n│ │ │ └── non_incremental.rs\n│ │ └── fs.rs\n│ ├── Cargo.toml\n│ ├── Cargo.lock\n│ └── target\n└── dev_shared ├── src │ └── lib.rs └── Cargo.toml To access these utility functions in the pie crate, add a dependency to dev_shared in pie/Cargo.toml along with another create that will help testing: We've also added the assert_matches crate, which is a handy library for asserting that a value matches a pattern. Note that these dependencies are added under dev-dependencies, indicating that these dependencies are only available when running tests, benchmarks, and examples. Therefore, users of our library will not depend on these crates, which is good, because temporary file management and assertions are not necessary to users of the library. Back to testing our filesystem utilities. Add the following tests to pie/src/fs.rs: #[cfg(test)]\nmod test { use std::fs::remove_file; use std::io; use assert_matches::assert_matches; use dev_shared::{create_temp_dir, create_temp_file}; use super::*; #[test] fn test_metadata_ok() -> Result<(), io::Error> { let temp_file = create_temp_file()?; let metadata = metadata(temp_file)?; assert_matches!(metadata, Some(metadata) => { assert!(metadata.is_file()); }); Ok(()) } #[test] fn test_metadata_none() -> Result<(), io::Error> { let temp_file = create_temp_file()?; remove_file(&temp_file)?; let metadata = metadata(&temp_file)?; assert!(metadata.is_none()); Ok(()) } #[test] fn test_open_if_file() -> Result<(), io::Error> { let temp_file = create_temp_file()?; let file = open_if_file(&temp_file)?; assert!(file.is_some()); Ok(()) } #[test] fn test_open_if_file_non_existent() -> Result<(), io::Error> { let temp_file = create_temp_file()?; remove_file(&temp_file)?; let file = open_if_file(&temp_file)?; assert!(file.is_none()); Ok(()) } #[test] fn test_open_if_file_on_directory() -> Result<(), io::Error> { let temp_dir = create_temp_dir()?; let file = open_if_file(temp_dir)?; assert!(file.is_none()); Ok(()) }\n} We test whether the functions conform to the specified behaviour. Unfortunately, we can't easily test when metadata and open_if_file should return an error, because we cannot disable read permissions on files via the Rust standard library. We use our create_temp_file and create_temp_dir utility functions to create temporary files and directories. The tempfile library takes care of deleting temporary files when they go out of scope (at the end of the test). We use assert_matches! to assert that metadata is Some(metadata), binding metadata in the => { ... } block in which we assert that the metadata describes a file. We will use this macro more in future integration tests. Rust Help Tests can return Result . When a test returns an Err, the test fails. This allows us to write more concise tests using error propagation. Now we are done unwinding our stack and have filesystem and testing utilities. Make the non-incremental context compatible by changing pie/src/context/non_incremental.rs: Since the non-incremental context does not track anything, we only try to open the file and return it, matching the contract in the documentation comment of the Context::require_file trait method. Confirm everything works with cargo test. 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