Analyze codebase for undefined behavior#54
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NiceAndPeter merged 2 commits intomainfrom Nov 21, 2025
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Added comprehensive UB analysis covering 6 major categories: - Uninitialized variables: 3 low-risk issues (code smells only) - Pointer arithmetic: 10+ issues (2 HIGH, 5 MEDIUM, 3+ LOW) - Null pointer dereferences: ZERO issues (excellent safety) - Integer overflow: 12 issues (3 CRITICAL, 4 HIGH, 3 MEDIUM, 2 LOW) - Type punning/aliasing: 8 issues (2 HIGH, 4 MEDIUM, 2 LOW) - Shift operations: 7 issues (2 MEDIUM, 5 LOW) Total: 40+ UB patterns identified across 84 files (~35K LOC) Critical issues requiring immediate attention: - Hash table length doubling without overflow check - Power-of-two shift operations with potential UB - Table array reallocation unchecked pointer arithmetic - GC-triggered pointer invalidation in string concat - Stack restore char* round-trip (LTO risk) Proposed action plan: Phases 116-119 (10-13 days) - Phase 116: Fix 11 critical/high issues - Phase 117: Fix remaining high-priority issues - Phase 118: Medium priority + comprehensive hardening - Phase 119: Testing, validation, documentation Document includes: - Detailed analysis of each issue with file:line references - Risk assessments and severity classifications - Code examples and reproduction scenarios - Specific fix recommendations with estimated time - Prioritized action plan with deliverables - Systemic improvement recommendations Status: NOT PRODUCTION READY - Critical fixes required
Add detailed strict aliasing and type punning analysis document generated during comprehensive UB analysis. Contains detailed examination of: - TValue union type punning patterns - GCBase reinterpret_cast conversions - Stack pointer arithmetic (LuaStack::restore) - NodeArray memory layout manipulation - TString variable-size object patterns - Table array type punning - Pointer-to-integer hashing - UpVal getLevel() casts Includes compiler risk assessment for LTO and aggressive optimization. This document provides deep-dive analysis referenced in main UB report.
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