# Release Notes v2.171.0-alpha - WebAssembly Disassembly
## Overview
This alpha release includes the WebAssembly disassembly feature implemented as part of Sprint 49. This feature enhances PMAT's ability to analyze WebAssembly binaries by providing detailed function-level disassembly and pattern detection.
## New Features
### WebAssembly Disassembly
- **Function-level disassembly**: Converts WASM binary functions to readable instruction sequences
- **Instruction analysis**: Provides detailed metadata for each instruction (category, stack effect)
- **Pattern detection**: Identifies common patterns like dead code after unreachable or infinite loops
- **Basic block analysis**: Identifies control flow structure within functions
- **Selective disassembly**: Only disassembles exported functions or those with high complexity
### Technical Improvements
- **Performance Optimization**: Improved disassembly performance with cached parsing
- **Error Handling**: Enhanced error reporting from WebAssembly disassembly
- **Integration**: Seamless integration with existing WebAssembly analysis features
## Bug Fixes
- Fixed WASM disassembly support to properly handle nested structures
- Corrected parsing of complex control flow instructions
- Addressed memory usage issues with large WebAssembly binaries
## Documentation
- Added documentation for WebAssembly disassembly features
- Updated language support documentation
- Created detailed pattern detection examples
## Architecture
The disassembly feature leverages the wasmparser crate to analyze WebAssembly binaries:
- **Modular Design**: Clear separation between parsing, disassembly, and pattern detection
- **Extensible Architecture**: Easy to add new pattern detection rules
- **Performance Focus**: Optimized for handling large WebAssembly files
## Compatibility Notes
- Requires Rust 1.67 or higher
- Compatible with all existing API clients
- Feature flags:
- `wasm-ast`: WebAssembly analysis (required)
## Technical Debt Reduction
This release marks the beginning of our technical debt reduction efforts:
- Implemented 1/5 high-severity technical debt issues
- Focused on WebAssembly disassembly as the first component
- Established a pattern for further debt reduction
## Credits
- Claude Code - Implementation of WebAssembly disassembly support
- PAIML Team - Architecture design and quality assurance
## Future Work
- Complete C/C++ language analyzer integration (planned for v2.171.0)
- Enhanced WebAssembly pattern detection
- Additional language-specific optimizations
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*Released: October 27, 2025*
*PMAT version: 2.171.0-alpha*