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Changelog

Documentation of all notable changes to the EVMC project.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

9.0.0 — 2021-06-30

Added

  • Support for London EIP-3198: block_base_fee member added to evmc_tx_context, BASEFEE instruction added. #603

  • Added Shanghai EVM revision. #604

  • Added EVMC_LATEST_STABLE_REVISON: alias for the latest known EVM revision with finalized specification. #605

  • The --bench flag has been added to evmc run to more precisely measure execution time. #598

  • Output stream operators and to_string() overloads for EVMC types evmc_revision and evmc_status_code are now part of public C and C++ API. #599

Changed

  • Adjustments to evmc::mocked_host: storage changes to non-existent keys are now preserved. #594

8.0.0 — 2021-04-27

Added

  • Support for Berlin EIP-2929: access_account() and access_storage() functions added to evmc_host_interface. #571

Changed

  • Instruction SHA3 has been renamed to KECCAK256 as proposed by EIP-1803 to better match the underlying hash function. #590
  • The C++ standard required has been increased to C++17. The minimal officially supported Clang version has been increased from 3.8 to 5. #584

7.5.0 — 2021-03-23

Added

  • New option --input for evmc run tool to specify execution input data (calldata). #564
  • New option --create for evmc run tool to create new contract with provided init code before main execution. This allows using Solidity compiler binary outputs directly by the tool. #566 
    solc --bin Contract.sol -o .
evmc run --create Contract.bin --input 370158ea
  • evmc run tool accepts both hex-strings or file paths for code and --input arguments. #574
  • New static C++ library evmc::hex added with procedures for hex encoding/decoding. Hex-strings are used by EVMC and related projects for internal testing. #575
  • New EVMC_INSUFFICIENT_BALANCE error code has been registered. #528

Changed

  • Java bindings fixes and improvements. It must be noted the bindings are in a work in progress state and are not suggested for production use. #535 #537 #541 #545 #549 #550 #551 #552 #553 #557 #579 #580 #581
  • C++'s std::hash and comparison operators for EVMC types has been optimized. #560 #561
  • evmc --version now also informs about the version of the loaded EVM. #567
  • The Example VM (evmc::example-vm) has been converted from C to C++. It now implements a subset of real EVM opcodes so examples and tests can use valid EVM bytecodes. #539

7.4.0 — 2020-06-24

Changed

  • The C++ standard required has been increased to C++14. #521
  • The C++ literals for address and bytes32 types have been reimplemented to use static_assert to report errors. This makes C++ bindings exception-free (no-throw guarantee level of exception safety). #520

Removed

  • The support for Visual Studio 2015 C/C++ compiler has been dropped as a consequence of requiring C++14. #521

7.3.0 — 2020-05-20

Added

  • Support for Go modules. #486

Changed

  • The minimum Go version supported bumped to 1.11 (Go modules are required). #486
  • Removed dependency on go-ethereum in Go bindings by introducing own Address and Hash types. #513

7.2.0 — 2020-05-13

Added

  • Added Java bindings. #455 #490 #503 #512
  • New evmc command-line tool has been added. At the moment it supports command run for executing bytecode in any EVMC-compatible VM implementation. Try evmc run --help for more information.
  • C++: EVMC basic types address and bytes32 have all the comparison operators supported. #474
  • C++: Convenient constructors from uint64_t added for basic types address and bytes32. #488
  • C++: Added VM::get_raw_pointer() method to directly access VM C API when needed. #492

Changed

  • CMake minimum version required has been bumped to 3.10. #495

Fixed

  • The implementation of C++ operator< for evmc::address and evmc::bytes32 has been fixed. #498

7.1.0 — 2019-11-29

Added

  • Added MockedHost C++ class (in form of header-only evmc::mocked_host library) which can be used to emulate Host behavior when testing VM implementations. #456
  • In the Rust bindings added more type aliases (MessageKind, MessageFlags, StatusCode, StorageStatus, Revision). #206
  • In CMake the evmc::evmc_cpp target has been added which represents the C++ EVMC API. #470

Changed

  • Require Rust 1.37.0 as a minimum.
  • In the Rust bindings mark read-only functions in ExecutionContext as non-mutating. #444
  • In the C++ HostInterface the logically read-only methods are marked with const. #461
  • Updated dependencies of the Rust bindings to latest stable versions. #462

7.0.0 „Istanbul Ready” — 2019-11-11

This version of EVMC delivers compatibility with Istanbul EVM revision. The ABI breaking change has been required in this case so some other backward-incompatible changes are also included and deprecated APIs have been removed.

Added

  • Support for Istanbul EIP-1344 (CHAINID opcode). chain_id added to evmc_tx_context struct. #375
  • Support for Istanbul EIP-1884 (Repricing for trie-size-dependent opcodes). #372
  • The Berlin EVM revision number has been added. #407
  • In C++ API, an overload for VM::execute() has been added that omits the Host context and interface parameters. This is useful for Precompiles VMs that do not interact with the Host. #302
  • In C++ API, the VM::has_capability() method has been added. #465

Changed

  • The evmc_instance renamed to evmc_vm. #430
  • The evmc_context renamed to evmc_host_context. #426
  • The evmc_host_interface is now separated from evmc_host_context. This simplifies language bindings which implement the evmc_host_interface. #427
  • The evmc::vm renamed to evmc::VM in C++ API. #252
  • Previously deprecated helpers.hpp header file has been removed. #410
  • Previously deprecated EVMC_CONSTANTINOPLE2 and EVMC_LATEST_REVISION revisions have been removed. #411
  • Previously deprecated tracing API has been removed. #429
  • In evmc::instructions library the undefined instructions have 0 gas cost instead of previous -1 value. #425
  • The EVM instruction tables have been redesigned to be more useful. #435
  • The EVMC loader trims all extensions (previously only the last one) from the EVMC module file name. #439
  • The EVMC loader no longer ties to guess the VM create function name by dropping prefix words from the name. #440
  • The helper function evmc_is_abi_compatible() returns now bool instead of int. #442
  • In the Rust bindings make ExecutionContext optional within execute. #350
  • A set of small improvements to C++ API. #445 #449 #451

6.3.1 - 2019-08-19

Added

  • Added LoadAndConfigure method to the Go API. #404

Deprecated

  • Previously deprecated is_zero() helper has been removed, but replaced with new evmc::is_zero() in API compatible way. #406

Fixed

  • In C++ API the get_balance() method now returns expected evmc::uint256be instead of evmc_uint256be. #403
  • Cable upgraded to 0.4.4 to fix incompatibility with older versions. #405

6.3.0 - 2019-08-12

Added

  • Experimental support for Precompiles - EVMC modules containing implementations of Ethereum precompiled contracts. To learn more read the EVMC Precompiles feature description. #267
  • The vm::get_capabilities() method has been added in C++ API. #301
  • A CMake helper for running evmc-vmtester. #303
  • The loader module introduces standardized EVMC module configuration string which contains path to the module and additional options. E.g. ./modules/vm.so,engine=compiler,trace,verbosity=2. A VM can be loaded, created and configured atomically with new evmc_load_and_configure() function. #313
  • Full support for 32-bit architectures has been added. #327
  • The C/C++ API for creating execution results in VMs has been extended to handle common usage cases. #333
  • Support for moving evmc::vm objects in C++ API. #341
  • The basic types address and bytes32 have received their C++ wrappers to assure they are always initialized. They also have convenient overloaded operators for comparison and usage as keys in standard containers. #357
  • The C++ EVMC basic types address and bytes32 have user defined literals. #359 
    auto a = 0xfB6916095ca1df60bB79Ce92cE3Ea74c37c5d359_address;
auto b = 0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3_bytes32;
  • CMake option EVMC_INSTALL (ON by default) to disable installing EVMC targets. This may be useful when EVMC is included in other project as git submodule or subtree. #360
  • The evmc-vmtester tool received support for EVMC module configuration. E.g. evmc-vmtester ./my_vm,mode=interpreter. #366
  • In evmc-vm Rust crate, ExecutionResult now has success, failure and revert helpers. #297 #368
  • Introduction of evmc-declare Rust crate with a procedural macro for easy VM declaration. #262 #316
  • Introduction of ExecutionMessage wrapper in the evmc-vm Rust crate. #324
  • Added type aliases and traits on basic types in the evmc-vm Rust crate. #342 #343

Changed

  • A lot of documentation fixes, improvements and cleanups. #271 #272 #276 #280 #345
  • In C++ API evmc::result::raw() renamed to evmc::result::release_raw(). #293
  • In evmc_load_and_create() the error_code is optional (can be NULL). #311

Deprecated

  • The usage of evmc/helpers.hpp has been deprecated. Use evmc/evmc.hpp which provides the same features. #358
  • The tracing API has been deprecated as there have been some design flaws discovered. New API is expected to be introduced in future. #376

Fixed

  • The vmtester tool now builds with MSVC with /std:c++17. #261 #263
  • The evmc_release_result() helper has been fixed. #266 #279
  • The missing include guard in evmc.hpp has been fixed. #300
  • A loaded VM with incompatible ABI version is now properly destroyed. #305 #306

6.2.2 - 2019-05-16

Fixed

  • Compilation error of evmc::result::raw() in Visual Studio fixed. #281
  • The evmc::result's move assignment operator fixed. #282

6.2.1 - 2019-04-29

Fixed

  • Disallow implicit conversion from C++ evmc::result to evmc_result causing unintendent premature releasing of resources. #256 #257

6.2.0 - 2019-04-25

Added

  • CMake option EVMC_TEST_TOOLS to build evmc-vmtester without bothering with internal unit tests. #216
  • The full C++ EVMC API for both VM and Host implementations. #217 #226
  • Initial and rough bindings for Rust. It is possible to implement an EVMC VM in Rust utilising some helpers. #201 #202 #233
  • Handling of DLL loading errors greatly improved by new evmc_last_error_msg() function. #230 #232

Changed

  • The minimum supported GCC version is 6 (bumped from undocumented version 4.8). #195
  • Go bindings improved by introduction of the TxContext struct. #197
  • A lot improvements to the evmc-vmtester tool. #221 #234 #238 #241 #242
  • Cable upgraded to version 0.2.17. #251

Deprecated

  • The EVMC_CONSTANTINOPLE2 revision name is deprecated, replaced with EVMC_PETERSBURG. #196

6.1.1 - 2019-02-13

Added

  • Documentation of elements of evmc_revision. #192

Fixed

  • Fixed compilation with GCC 5 because of the "deprecated" attribute applied to an enum element. #190

6.1.0 - 2019-01-24

Added

  • The Istanbul EVM revision has been added. #174
  • The is_zero() C++ helper for basic data types has been added. #182
  • Reserved the post-Constantinople EVM revision number. #186
  • The C++ wrappers for VM and execution result objects have been added. #187

Deprecated

  • The EVMC_LATEST_REVISION name has been deprecated, replaced with EVMC_MAX_REVISION. #184

6.0.2 - 2019-01-16

Fixed

  • Add missing salt argument for CREATE2 in Host in Go bindings. #179

6.0.1 - 2018-11-10

Fixed

  • Integration of EVMC as a CMake subproject is easier because Hunter is not loaded unless building tests (EVMC_TESTING=ON) is requested. #169

6.0.0 - 2018-10-24

Added

Changed

  • EVMC loader symbol searching has been generalized. #119
  • The evmc_context_fn_table renamed to evmc_host_interface. #125
  • The evmc_message fields reordered. #128
  • The evmc_set_option() now returns more information about the failure cause. #136
  • In C the bool type is used instead of int for true/false flags. #138 #140
  • Simplification of signatures of Host methods. #154

5.2.0 - 2018-08-28

Added

  • Use also "evmc_create" function name for loading EVMC DLLs. #81

Changed

  • Documentation improvements, including documentation for the VM Tester. #97 #107

Fixed

  • The evmc.h header compatibility with C++98 fixed. #92
  • Compilation and build configuration fixes. #93 #103

5.1.0 - 2018-08-23

Added

  • Go language bindings for EVMC. #41
  • New error codes. #56 #62
  • More helper functions. #67 #68 #70

Changed

  • Documentation has been extended. #58
  • Optional Result Storage helper module has been separated. #59
  • Cable upgraded to 0.2.11. #75
  • The license changed from MIT to Apache 2.0. #77

Fixed

  • Go bindings: Properly handle unknown error codes. #72

5.0.0 - 2018-08-10

Added

  • List of status codes extended and reordered. #23 #24
  • VM Tracing API. #32
  • The support library with metrics tables for EVM1 instructions. #33 #34
  • Ability to create EVMC CMake package. #35
  • The loader support library for VM dynamic loading. #40
  • Constantinople: Support for CREATE2 instruction. #45
  • Constantinople: Support for EXTCODEHASH instruction. #49
  • Constantinople: Storage status is reported back from evmc_set_storage(). #52