Web assembly backend

.github/workflows/push.yml

@@ -33,5 +33,29 @@ jobs:
         gcc --version        
     - name: Install langs package
       run: raco pkg install ../the-838e-compiler/
+    - name: Install g++
+      run: sudo apt -y install g++
+    - name: Install cmake
+      run: sudo apt-get -y install cmake
+    - name: Install wabt
+      run: |
+        cd ..
+        git clone --recursive https://github.com/WebAssembly/wabt
+        cd wabt
+        mkdir build
+        cd build
+        cmake ..
+        cmake --build .
+        cd ..
+        export PATH="$(pwd)/bin:$PATH"
+        echo 'export PATH="'$(pwd)'/bin:$PATH"' >> ~/.bashrc
+    - name: Install nodejs
+      run: sudo apt -y install nodejs
     - name: Run tests
-      run: raco test -p the-838e-compiler
+      run: |
+        pwd
+        export PATH="/home/runner/work/the-838e-compiler/wabt/bin:$PATH"
+        export PATH="/home/runner/work/the-838e-compiler/the-838e-compiler/.wasmtime/bin:$PATH"
+        echo $PATH
+        wasmtime /home/runner/work/the-838e-compiler/the-838e-compiler/.wasmtime/bin/demo.wat
+        raco test -p the-838e-compiler

.wasmtime/Additions_README.md

@@ -0,0 +1,84 @@
+## Additions in this build of wasmtime
+
+The wasmtime executable in the bin folder is a modified version of wasmtime. It includes three additional functions, print_codepoint, print_int, and error_exit as compared with the standard wasmtime.  This version was built by making the following changes to the following files in a git clone of wasmtime repository (following the method by Radu Matei in https://radu-matei.com/blog/adding-wasi-syscall/ with some changes for the newer version) and then executing the command cargo build --release in the wasmtime directory:
+
+1 - In wasmtime\crates\wasi-common\src\snapshots\preview_1.rs the following functions were added in lines 1101-1122 in implementation 
+impl<'a> wasi_snapshot_preview1::WasiSnapshotPreview1 for WasiCtx { } :
+
+    ```rust
+    fn print_codepoint(&self, fd: types::Fd) -> Result<(), Error> {
+        let y = u32::from(fd);
+        let c = std::char::from_u32(y);
+        match c {
+            Some(x) =>  print!("{}", x),
+            None => print!("none"),
+        }
+        Ok(())
+    }
+
+    fn print_int(&self, fd: types::Fd) -> Result<(), Error> {
+        let y = u32::from(fd);
+        let x = y as i32;
+        print!("{}", x);
+        Ok(())
+    }
+
+    fn error_exit(&self) -> Result<(), Error> {
+        println!("'err");
+        std::process::exit(1);
+    } and wasmtime\crates\wasi-common\src\snapshots\preview_0.rs
+    ```
+
+2 - In wasmtime\crates\wasi-common\src\snapshots\preview_0.rs the same code was added in lines 926-947, in addition to the following code in lines 331-333 in use of macro rule convert_flags_bidirectional!(types::Rights, snapshot1_types::Rights, ...) :
+
+    ```rust
+    PRINT_CODEPOINT,
+    PRINT_INT,
+    ERROR_EXIT
+    ```
+
+3 - In wasmtime\crates\wasi-common\WASI\phases\old\snapshot_0\witx\wasi_unstable.witx the following code was added in lines 512-527 in (module $wasi_unstable ... ):
+
+  ```rust
+  ;;; Print a codepoint character.
+  (@interface func (export "print_codepoint")
+    (param $fd $fd)
+    (result $error (expected (error $errno)))
+  )
+
+  ;;; Print an i32 int.
+  (@interface func (export "print_int")
+    (param $fd $fd)
+    (result $error (expected (error $errno)))
+  )
+
+  ;;; Print an i32 int.
+  (@interface func (export "error_exit")
+    (result $error (expected (error $errno)))
+  )
+  ```
+
+4 - In wasmtime\crates\wasi-common\WASI\phases\snapshot\witx\wasi_snapshot_preview1.witx the same code was added in lines 509-524.
+
+5 - In wasmtime\crates\wasi-common\WASI\phases\old\snapshot_0\witx\typenames.witx the following code was added in lines 273-278 in  ;;; File descriptor rights, determining which actions may be performed. (typename $rights (flags (@witx repr u64) ... )) :
+
+    ```rust
+    ;;; The right to invoke `print_codepoint`.
+    $print_codepoint
+    ;;; The right to invoke `print_int`.
+    $print_int
+    ;;; The right to invoke `error_exit`.
+    $error_exit
+    ```
+
+6 - In wasmtime\crates\wasi-common\WASI\phases\snapshot\witx\typenames.witx the same code was added in lines 273-278.
+
+The git clone of wasmtime repository is not included. The wasmtime repository's address is: https://github.com/bytecodealliance/wasmtime and it can be cloned with the following command:  
+
+git clone --recurse-submodules https://github.com/bytecodealliance/wasmtime.git
+
+The README.md file in this folder is the documentation when the standard wasmtime is installed in a .wasmtime folder with the following command:
+
+```sh
+$ curl https://wasmtime.dev/install.sh -sSf | bash
+```

.wasmtime/LICENSE

@@ -0,0 +1,220 @@
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