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evmc/CHANGELOG.md

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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].
## [6.3.0] - unreleased
### Added
- Experimental support for _Precompiles_ -
EVMC modules containing implementations of Ethereum precompiled contracts.
To learn more read
the [EVMC Precompiles](https://github.com/ethereum/evmc/issues/259) feature description.
[[#267](https://github.com/ethereum/evmc/pull/267)]
- The `vm::get_capabilities()` method has been added in C++ API.
[[#301](https://github.com/ethereum/evmc/pull/301)]
- A CMake helper for running evmc-vmtester.
[[#303](https://github.com/ethereum/evmc/pull/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](https://github.com/ethereum/evmc/pull/313)]
- Full support for 32-bit architectures has been added.
[[#327](https://github.com/ethereum/evmc/pull/327)]
- The C/C++ API for creating execution results in VMs has been extended
to handle common usage cases.
[[#333](https://github.com/ethereum/evmc/pull/333)]
- Support for moving `evmc::vm` objects in C++ API.
[[#341](https://github.com/ethereum/evmc/pull/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](https://github.com/ethereum/evmc/pull/357)]
- The C++ EVMC basic types `address` and `bytes32` have user defined literals.
[[#359](https://github.com/ethereum/evmc/pull/359)]
```cpp
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](https://github.com/ethereum/evmc/pull/360)]
- The `evmc-vmtester` tool received support for EVMC module configuration.
E.g. `evmc-vmtester ./my_vm,mode=interpreter`.
[[#366](https://github.com/ethereum/evmc/pull/366)]
### Changed
- A lot of documentation fixes, improvements and cleanups.
[[#271](https://github.com/ethereum/evmc/pull/271),
[#272](https://github.com/ethereum/evmc/pull/272),
[#276](https://github.com/ethereum/evmc/pull/276),
[#280](https://github.com/ethereum/evmc/pull/280),
[#345](https://github.com/ethereum/evmc/pull/345)]
- In C++ API `evmc::result::raw()` renamed to `evmc::result::release_raw()`.
[[#293](https://github.com/ethereum/evmc/pull/293)]
- In `evmc_load_and_create()` the `error_code` is optional (can be `NULL`).
[[#311](https://github.com/ethereum/evmc/pull/311)]
### Deprecated
- The usage of `evmc/helpers.hpp` has been deprecated. Use `evmc/evmc.hpp`
which provides the same features.
[[#358](https://github.com/ethereum/evmc/pull/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](https://github.com/ethereum/evmc/pull/376)]
### Fixed
- The `vmtester` tool now builds with MSVC with `/std:c++17`.
[[#261](https://github.com/ethereum/evmc/issues/261),
[#263](https://github.com/ethereum/evmc/pull/263)]
- The `evmc_release_result()` helper has been fixed.
[[#266](https://github.com/ethereum/evmc/issues/266),
[#279](https://github.com/ethereum/evmc/pull/279)]
- The missing include guard in `evmc.hpp` has been fixed.
[[#300](https://github.com/ethereum/evmc/pull/300)]
- A loaded VM with incompatible ABI version is now properly destroyed.
[[#305](https://github.com/ethereum/evmc/issues/305),
[#306](https://github.com/ethereum/evmc/pull/306)]
## [6.2.2] - 2019-05-16
### Fixed
- Compilation error of `evmc::result::raw()` in Visual Studio fixed.
[[#281](https://github.com/ethereum/evmc/pull/281)]
- The `evmc::result`'s move assignment operator fixed.
[[#282](https://github.com/ethereum/evmc/pull/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](https://github.com/ethereum/evmc/issues/256),
[#257](https://github.com/ethereum/evmc/issues/257)]
## [6.2.0] - 2019-04-25
### Added
- CMake option `EVMC_TEST_TOOLS` to build evmc-vmtester without bothering with internal unit tests.
[[#216](https://github.com/ethereum/evmc/pull/216)]
- The full C++ EVMC API for both VM and Host implementations.
[[#217](https://github.com/ethereum/evmc/pull/217),
[#226](https://github.com/ethereum/evmc/pull/226)]
- Initial and rough **bindings for Rust**. It is possible to implement an
EVMC VM in Rust utilising some helpers.
[[#201](https://github.com/ethereum/evmc/pull/201),
[#202](https://github.com/ethereum/evmc/pull/202),
[#233](https://github.com/ethereum/evmc/pull/233)]
- Handling of DLL loading errors greatly improved by
new `evmc_last_error_msg()` function.
[[#230](https://github.com/ethereum/evmc/pull/230),
[#232](https://github.com/ethereum/evmc/pull/232)]
### Changed
- The minimum supported GCC version is 6 (bumped from undocumented version 4.8).
[[#195](https://github.com/ethereum/evmc/pull/195)]
- Go bindings improved by introduction of the `TxContext` struct.
[[#197](https://github.com/ethereum/evmc/pull/197)]
- A lot improvements to the `evmc-vmtester` tool.
[[#221](https://github.com/ethereum/evmc/pull/221),
[#234](https://github.com/ethereum/evmc/pull/234),
[#238](https://github.com/ethereum/evmc/pull/238),
[#241](https://github.com/ethereum/evmc/pull/241),
[#242](https://github.com/ethereum/evmc/pull/242)]
- [Cable] upgraded to version 0.2.17.
[[#251](https://github.com/ethereum/evmc/pull/251)]
### Deprecated
- The `EVMC_CONSTANTINOPLE2` revision name is deprecated, replaced with `EVMC_PETERSBURG`.
[[#196](https://github.com/ethereum/evmc/pull/196)]
## [6.1.1] - 2019-02-13
### Added
- Documentation of elements of `evmc_revision`.
[[#192](https://github.com/ethereum/evmc/pull/192)]
### Fixed
- Fixed compilation with GCC 5 because of the "deprecated" attribute applied
to an enum element.
[[#190](https://github.com/ethereum/evmc/pull/190)]
## [6.1.0] - 2019-01-24
### Added
- The **Istanbul** EVM revision has been added.
[[#174](https://github.com/ethereum/evmc/pull/174)]
- The `is_zero()` C++ helper for basic data types has been added.
[[#182](https://github.com/ethereum/evmc/pull/182)]
- Reserved the post-Constantinople EVM revision number.
[[#186](https://github.com/ethereum/evmc/pull/186)]
- The C++ wrappers for VM and execution result objects have been added.
[[#187](https://github.com/ethereum/evmc/pull/187)]
### Deprecated
- The `EVMC_LATEST_REVISION` name has been deprecated, replaced with `EVMC_MAX_REVISION`.
[[#184](https://github.com/ethereum/evmc/pull/184)]
## [6.0.2] - 2019-01-16
### Fixed
- Add missing salt argument for CREATE2 in Host in Go bindings.
[[#179](https://github.com/ethereum/evmc/pull/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](https://github.com/ethereum/evmc/pull/169)]
## [6.0.0] - 2018-10-24
### Added
- [EVMC Host implementation example](https://github.com/ethereum/evmc/blob/master/examples/example_host.cpp).
[[#116](https://github.com/ethereum/evmc/pull/116)]
- Support for Constantinople SSTORE net gas metering.
[[#127](https://github.com/ethereum/evmc/pull/127)]
- Support for Constantinople CREATE2 salt in Go bindings.
[[#133](https://github.com/ethereum/evmc/pull/133)]
- A VM can now report its **capabilities** (i.e. EVM and/or ewasm).
[[#144](https://github.com/ethereum/evmc/pull/144)]
- Introduction of the `evmc_bytes32` type.
[[#152](https://github.com/ethereum/evmc/pull/152)]
- [EVMC Host implementation guide](https://ethereum.github.io/evmc/hostguide.html).
[[#159](https://github.com/ethereum/evmc/pull/159)]
- [EVMC VM implementation guide](https://ethereum.github.io/evmc/vmguide.html).
[[#160](https://github.com/ethereum/evmc/pull/160)]
### Changed
- EVMC loader symbol searching has been generalized.
[[#119](https://github.com/ethereum/evmc/pull/119)]
- The `evmc_context_fn_table` renamed to `evmc_host_interface`.
[[#125](https://github.com/ethereum/evmc/pull/125)]
- The `evmc_message` fields reordered.
[[#128](https://github.com/ethereum/evmc/pull/128)]
- The `evmc_set_option()` now returns more information about the failure cause.
[[#136](https://github.com/ethereum/evmc/pull/136)]
- In C the `bool` type is used instead of `int` for true/false flags.
[[#138](https://github.com/ethereum/evmc/pull/138),
[#140](https://github.com/ethereum/evmc/pull/140)]
- Simplification of signatures of Host methods.
[[#154](https://github.com/ethereum/evmc/pull/154)]
## [5.2.0] - 2018-08-28
### Added
- Use also "evmc_create" function name for loading EVMC DLLs.
[[#81](https://github.com/ethereum/evmc/pull/81)]
### Changed
- Documentation improvements, including documentation for the VM Tester.
[[#97](https://github.com/ethereum/evmc/pull/97),
[#107](https://github.com/ethereum/evmc/pull/107)]
### Fixed
- The `evmc.h` header compatibility with C++98 fixed.
[[#92](https://github.com/ethereum/evmc/pull/92)]
- Compilation and build configuration fixes.
[[#93](https://github.com/ethereum/evmc/pull/93),
[#103](https://github.com/ethereum/evmc/pull/103)]
## [5.1.0] - 2018-08-23
### Added
- **Go language bindings** for EVMC.
[[#41](https://github.com/ethereum/evmc/pull/41)]
- New error codes.
[[#56](https://github.com/ethereum/evmc/pull/56),
[#62](https://github.com/ethereum/evmc/pull/62)]
- More helper functions.
[[#67](https://github.com/ethereum/evmc/pull/67),
[#68](https://github.com/ethereum/evmc/pull/68),
[#70](https://github.com/ethereum/evmc/pull/70)]
### Changed
- Documentation has been extended.
[[#58](https://github.com/ethereum/evmc/pull/58)]
- Optional Result Storage helper module has been separated.
[[#59](https://github.com/ethereum/evmc/pull/59)]
- [Cable] upgraded to 0.2.11.
[[#75](https://github.com/ethereum/evmc/pull/75)]
- The license changed from MIT to **Apache 2.0**.
[[#77](https://github.com/ethereum/evmc/pull/77)]
### Fixed
- Go bindings: Properly handle unknown error codes.
[[#72](https://github.com/ethereum/evmc/pull/72)]
## [5.0.0] - 2018-08-10
### Added
- List of status codes extended and reordered.
[[#23](https://github.com/ethereum/evmc/pull/23),
[#24](https://github.com/ethereum/evmc/pull/24)]
- VM Tracing API.
[[#32](https://github.com/ethereum/evmc/pull/32)]
- The support library with **metrics tables for EVM1 instructions**.
[[#33](https://github.com/ethereum/evmc/pull/33),
[#34](https://github.com/ethereum/evmc/pull/34)]
- Ability to create EVMC CMake package.
[[#35](https://github.com/ethereum/evmc/pull/35)]
- The loader support library for VM dynamic loading.
[[#40](https://github.com/ethereum/evmc/pull/40)]
- Constantinople: Support for `CREATE2` instruction.
[[#45](https://github.com/ethereum/evmc/pull/45)]
- Constantinople: Support for `EXTCODEHASH` instruction.
[[#49](https://github.com/ethereum/evmc/pull/49)]
- Constantinople: Storage status is reported back from `evmc_set_storage()`.
[[#52](https://github.com/ethereum/evmc/pull/52)]
[6.3.0]: https://github.com/ethereum/evmc/compare/v6.2.1...master
[6.2.2]: https://github.com/ethereum/evmc/releases/tag/v6.2.2
[6.2.1]: https://github.com/ethereum/evmc/releases/tag/v6.2.1
[6.2.0]: https://github.com/ethereum/evmc/releases/tag/v6.2.0
[6.1.1]: https://github.com/ethereum/evmc/releases/tag/v6.1.1
[6.1.0]: https://github.com/ethereum/evmc/releases/tag/v6.1.0
[6.0.2]: https://github.com/ethereum/evmc/releases/tag/v6.0.2
[6.0.1]: https://github.com/ethereum/evmc/releases/tag/v6.0.1
[6.0.0]: https://github.com/ethereum/evmc/releases/tag/v6.0.0
[5.2.0]: https://github.com/ethereum/evmc/releases/tag/v5.2.0
[5.1.0]: https://github.com/ethereum/evmc/releases/tag/v5.1.0
[5.0.0]: https://github.com/ethereum/evmc/releases/tag/v5.0.0
[Cable]: https://github.com/ethereum/cable
[Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
[Semantic Versioning]: https://semver.org
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