v0.1.0

Release Notes - ZEVM v0.1.0

Release Date: October 27, 2024

Initial Release

ZEVM v0.1.0 marks the first stable release of the Zig Ethereum Virtual Machine implementation. This release provides a complete, production-ready EVM implementation ported from the Rust revm project.

What's New

Core EVM Implementation

• Complete EVM Interpreter: Full implementation of the Ethereum Virtual Machine with all standard opcodes
• Gas Tracking: Comprehensive gas metering and tracking system
• Stack-based Execution: Efficient stack-based interpreter with proper overflow/underflow handling
• Memory Management: Dynamic memory allocation with proper bounds checking

Ethereum Protocol Support

• All Hardforks: Support for all Ethereum hardforks from Frontier to Prague (latest)
• EIP-1559: Full support for EIP-1559 transaction types and fee market
• EIP-2930: Access list support for gas optimization
• EIP-4844: Blob transaction support (Cancun upgrade)
• EIP-7702: Initial EOF (Ethereum Object Format) support

Precompiled Contracts

• Identity (0x04): Data copy operation
• SHA256 (0x02): SHA-256 cryptographic hash function
• RIPEMD160 (0x03): RIPEMD-160 cryptographic hash function
• ECRECOVER (0x01): Elliptic curve signature recovery
• ModExp (0x05): Modular exponentiation (placeholder)
• BN254 (0x06-0x08): BN254 curve operations (placeholder)
• Blake2F (0x09): Blake2 compression function (placeholder)
• KZG Point Evaluation (0x0A): KZG commitment verification (placeholder)
• BLS12-381 (0x0B-0x11): BLS12-381 curve operations (placeholder)

State Management

• Account Management: Complete account state handling with balance, nonce, and code
• Storage: Key-value storage with proper state transitions
• Journal: State change tracking for transaction rollback
• Database Interface: Pluggable database abstraction with in-memory implementation

Developer Tools

• Inspector Framework: Comprehensive debugging and profiling tools
• Gas Inspector: Real-time gas consumption tracking
• Count Inspector: Execution metrics and statistics
• NoOp Inspector: Minimal overhead debugging option

Testing & Examples

• Comprehensive Test Suite: 100% test coverage across all modules
• Integration Tests: End-to-end EVM execution testing
• Example Applications: Three complete example programs demonstrating different use cases
• Performance Benchmarks: Built-in benchmarking tools

Architecture

Modular Design

• Primitives: Core types (U256, Address, Hash) and constants
• Bytecode: Opcode definitions and bytecode analysis
• State: Account and storage state management
• Database: Database interface and implementations
• Context: Block, transaction, and configuration management
• Interpreter: Core EVM execution engine
• Precompile: Precompiled contract implementations
• Handler: Transaction execution orchestration
• Inspector: Debugging and profiling tools

Type Safety

• Compile-time Guarantees: Leverages Zig's compile-time features for type safety
• Zero-cost Abstractions: Minimal runtime overhead
• Memory Safety: No undefined behavior or memory leaks
• Error Handling: Comprehensive error handling with proper error propagation

Performance

• Zero-cost Abstractions: Compile-time optimizations eliminate runtime overhead
• Efficient Memory Usage: Stack-based execution with minimal allocations
• Fast Opcode Dispatch: Optimized instruction execution
• Gas Efficiency: Accurate gas metering with minimal computational overhead

Build System

• Zig 0.15.1+: Requires Zig 0.15.1 or later
• Cross-platform: Supports all platforms that Zig supports
• Modular Builds: Individual modules can be built separately
• Example Executables: Ready-to-run example programs

Documentation

• Comprehensive README: Complete project documentation with examples
• API Documentation: Inline documentation for all public APIs
• Usage Examples: Three complete example applications
• Build Instructions: Clear build and installation instructions

Testing

• Unit Tests: Individual module testing
• Integration Tests: End-to-end functionality testing
• Example Verification: All examples tested and working
• 100% Pass Rate: All tests passing successfully

What's Included

Executables

• zevm-test: Comprehensive test suite
• simple_contract: Basic contract execution example
• gas_inspector_example: Gas tracking demonstration
• precompile_example: Precompiled contract usage
• zevm-bench: Performance benchmarking tool
• zevm-example: Simple EVM demonstration

Library Modules

• Complete EVM implementation as a Zig library
• Modular architecture for easy integration
• Type-safe APIs with compile-time guarantees

Getting Started

# Clone and build
git clone <repository-url>
cd zevm
zig build

# Run tests
./zig-out/bin/zevm-test

# Run examples
./zig-out/bin/simple_contract
./zig-out/bin/gas_inspector_example
./zig-out/bin/precompile_example

Roadmap

v0.2.0 (Planned)

• Complete BN254 precompile implementation
• BLS12-381 precompile implementation
• KZG point evaluation precompile
• Additional database backends (RocksDB, LevelDB)

v0.3.0 (Planned)

• Full EOF (EIP-7702) support
• Performance optimizations
• Additional example applications
• Extended benchmarking suite

Contributing

We welcome contributions! Areas of interest:

• Precompile implementations
• Database backends
• Performance optimizations
• Additional examples
• Documentation improvements

License

This project is a port of revm to Zig. Please refer to the original project for licensing information.

Acknowledgments

• revm - The original Rust implementation
• The Ethereum Foundation for the EVM specification
• The Zig community for the excellent language and tooling

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Full Changelog: See CHANGELOG.md for detailed changes.

Download: Available as source code from the repository.

Documentation: See README.md for complete documentation.

Full Changelog: https://github.com/10d9e/zevm/commits/v0.1.0