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Changelog

Documentation of all notable changes to the evmone project.

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

0.4.1 — 2020-04-01

Fixed

  • The release binaries for Windows are now built without AVX instruction set enabled. That was never intended and is consistent with binaries for other operating systems. #230

0.4.0 — 2019-12-09

Fixed

  • In previous versions evmone incorrectly assumed that code size cannot exceed 24576 bytes (0x6000) — the limit introduced for the size of newly deployed contracts by EIP-170 in Spurious Dragon. The limit do not apply to contract creating init code (i.e. in context of "create" transaction or CREATE instruction). Therefore, the pre-processing phase in evmone has been reworked to raise the technical limits or eliminated them entirely. From now on, only blocks of instruction with total base gas cost exceeding 4294967295 (2³² - 1) combined with execution gas limit also above this value can cause issues. #217 #218 #219 #221

Changed

0.3.0 — 2019-11-14

This release of evmone adds changes for Istanbul EVM revision.

Added

  • Istanbul EVM revision support with new costs for some instructions (EIP-1884). #191
  • Implementation of CHAINID instruction from the Istanbul EVM revision (EIP-1344). #190
  • Implementation of SELFBALANCE instruction from the Istanbul EVM revision (EIP-1884). #24
  • Implementation of new cost model for SSTORE from the Istanbul EVM revision (EIP-2200). #142

Changed

0.2.0 — 2019-09-24

This release of evmone is binary compatible with 0.1 and delivers big performance improvements – both code preprocessing and execution is ~66% faster (needs ~40% less time).

Added

  • evm-test – the testing tool for EVMC-compatible EVM implementations. #85
  • evmone-fuzzer – the testing tool that fuzzes evmone execution against aleth-interpreter execution. Any other EVMC-compatible EVM implementation can be added easily. #162 #184
  • evmone-standalone – single static library that bundles evmone with all its static library dependencies (available on Linux, but support can be extended to other platforms). #95
  • The evmone-bench tool has learned how to benchmark external EVMC-compatible EVMs. #111
  • The evmone-bench tool sorts test cases by file names and allows organizing them in subfolders. #150
  • The docker image ethereum/evmone with evmone and modified geth is available on Docker Hub. #127

Changed

Optimizations

  • Instead of checking basic block preconditions (base gas cost, stack requirements) in the dispatch loop, this is now done in the special "BEGINBLOCK" instruction — execution time reduction -2–8%. #74
  • New EVM stack implementation has replaced naïve usage of std::vector<intx::uint256> — -8–16%. #79
  • Improvements to interpreter's dispatch loop — -4–9%. #107
  • Optimization of the JUMPDEST map — up to -34%. #80
  • Optimizations to code preprocessing / analysis. #121 #125 #153 #168 #178
  • Push instructions with values up to 8 bytes (PUSH1–PUSH8) are now handled much more efficiently — up to -9%. #122
  • Pointer to next instruction is now obtained in instruction implementations (instead of the dispatch loop) and is kept in CPU registers only — -3–7%. #133
  • The run-time information about basic blocks has been compressed. #139 #144

Other changes

  • The DUP, SWAP, LOG and CALL instructions are now implemented by individual functions (template instances) instead of a parametrized function handling each family of instructions. #126 #159
  • EVMC upgraded to version 6.3.1. #129 #77 #96
  • intx upgraded to version 0.4.0. #131
  • The ability to provide custom opcode table for code preprocessing has been dropped. #167

Fixed

  • The gas calculation for blocks containing an undefined instruction has been fixed. This bug could not cause consensus issue because a block with an undefined instruction terminates with an exception despite incorrect gas checking. However, execution might have ended with a confusing error code. #93
  • Fix for LOG being emitted after out-of-gas exception. #120

0.1.1 — 2019-09-11

Changed

  • EVMC upgraded to version 6.3.1 (still ABI-compatible with evmone 0.1.0). #171
  • Changes to the evmone-bench tool backported from 0.2. This allows better performance comparison between 0.1 and 0.2 as both versions can run the same set of benchmarks. #172

0.1.0 — 2019-06-19

The first release of the evmone project. It delivers fully-compatible and high-speed EVM implementation.

Added

  • Support for all current EVM revisions up to Petersburg.
  • Exposes EVMC 6 ABI.
  • The intx 0.2.0 library is used for 256-bit precision arithmetic.