Neo Compiler Fuzzer Implementation and Unit Tests

[Jim8y]

Overview

This PR implements a production-ready Neo Compiler Fuzzer for testing the Neo N3 smart contract compiler. The fuzzer dynamically generates valid smart contracts with various combinations of C# syntax features and Neo-specific functionality, compiles them using the Neo.Compiler.CSharp CompilationEngine, and optionally tests their execution.

Key Features

• Dynamic Contract Generation: Generates random, valid Neo N3 smart contracts with configurable feature sets
• Comprehensive Coverage: Tests a wide range of C# syntax features and Neo-specific functionality
• Long-Running Support: Can run for specified durations (minutes, hours, days, weeks) with checkpointing
• Detailed Reporting: Generates comprehensive reports and statistics about the fuzzing process
• Production-Ready Implementation: Uses the Neo.Compiler.CSharp CompilationEngine directly
• Robust Error Handling: Comprehensive error handling and validation
• Extensive Documentation: Complete documentation in the docs/fuzzer/compiler directory

Implementation Details

1. Core Components:

   • DynamicContractFuzzer: Main class for orchestrating the fuzzing process
   • FragmentGenerator: Generates code fragments for various features
   • Logger: Provides logging functionality

2. Command-Line Interface:

   • Support for both iteration-based and duration-based fuzzing
   • Configurable feature count, output directory, and log level
   • Checkpoint interval configuration for long-running sessions

3. Shell Script:

   • Updated run-compiler-fuzzer.sh script for easy execution
   • Support for all command-line options

4. Unit Tests:

   • Comprehensive test suite in tests/Neo.Compiler.Fuzzer.Tests
   • Tests for contract generation, compilation, and feature handling

Documentation

Added comprehensive documentation in the docs/fuzzer/compiler directory:

• README.md: Overview and getting started guide
• features.md: Detailed list of supported features
• architecture.md: System architecture and component interactions
• configuration.md: Configuration options and customization
• reports.md: Report formats and interpretation
• troubleshooting.md: Common issues and solutions

Testing

The implementation has been tested with various configurations:

• Different feature counts (1-10 features per contract)
• Different iteration counts (1-100 iterations)
• Different durations (minutes to hours)
• With and without execution testing

Current success rate is approximately 70% with 3 features per contract, which is expected given the random nature of the feature combinations.

Future Work

Potential future enhancements:

• Additional feature generators for more comprehensive coverage
• Improved success rate through better feature compatibility handling
• Support for targeted fuzzing of specific compiler components

Checklist

• Code follows the project's coding style
• Documentation has been updated
• Unit tests have been added/updated and pass
• Shell script has been updated
• PR description adequately describes the changes

[Wi1l-B0t]

Need rebase master(better than merge)