Claude Roslyn Repo Analysis #81401
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Claude Roslyn Repo Analysis #81401
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Created extensive documentation for Microsoft engineers working on Roslyn: - README.md: Overview and navigation guide - 01-repository-structure.md: Complete repository directory map - 02-component-guide.md: Detailed component and API reference - 03-feature-location-guide.md: Quick reference for finding features - 04-architecture.md: Architecture patterns and design principles - 05-developer-guide.md: Practical guide for common development tasks This documentation maps the entire Roslyn codebase, showing exactly where to find and modify components, features, and functionality. It provides: - Complete directory structure with explanations - Component-by-component breakdown (compilers, workspaces, IDE features) - Feature location guide (IntelliSense, refactorings, analyzers, etc.) - Architecture and design patterns (red-green trees, immutability, MEF) - Developer workflows (adding language features, analyzers, refactorings) - Testing strategies and debugging tips Designed for engineers who need to quickly locate code, understand the architecture, and make changes effectively over a 2-year period.
Created surgical guide for modifying the C# language (06-compiler-internals.md): PARSER (60+ files mapped): - LanguageParser.cs (652KB) - Main parser with all key methods - Lexer.cs (186KB) - Tokenization engine - Specialized parsers for patterns, interpolated strings, etc. - Exact methods to modify for new syntax BINDER (30+ files mapped): - Binder_Expressions.cs (594KB) - All expression binding - Binder_Statements.cs (204KB) - All statement binding - Binder_Operators.cs (317KB) - Operator resolution - Binder_Patterns.cs (99KB) - Pattern matching - Complete scope binder hierarchy SYMBOLS: - Core symbol types (TypeSymbol, MethodSymbol, etc.) - Source symbols vs metadata symbols - Synthesized symbols for compiler-generated code - Symbol construction and substitution LOWERING (60+ LocalRewriter files): - LocalRewriter_BinaryOperator.cs (126KB) - LocalRewriter_ForEachStatement.cs (66KB) - foreach → while - LocalRewriter_UsingStatement.cs - using → try/finally - Async/await state machine generation - Iterator state machine generation - Closure conversion and lambda capturing FLOW ANALYSIS: - DefiniteAssignment.cs (126KB) - NullableWalker.cs (656KB) - Nullable analysis - Control flow and reachability analysis CODE GENERATION: - EmitExpression.cs (178KB) - IL for expressions - EmitStatement.cs (87KB) - IL for statements - Complete IL emission pipeline ERROR SYSTEM: - ErrorCode.cs - All compiler errors/warnings - Error message templates and diagnostics MODIFICATION WORKFLOWS: - Step-by-step: Add new operator - Step-by-step: Add new statement type - Step-by-step: Add pattern matching feature - Language feature reference (where each C# feature is implemented) This provides surgical precision for any C# language modification. Also updated README.md to highlight compiler internals documentation.
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