llvm-project

68192737 - [LifetimeSafety] Cache lifetimebound macro lookup (#205250)

[LifetimeSafety] Cache lifetimebound macro lookup (#205250) Cache lifetimebound macro spelling lookup used by fix-it suggestions. Current cache strategy: - During cache build, collect macro names that have ever been defined as a lifetimebound attribute spelling. - During lookup, only visit those cached macro names, find the active definition at the fix-it location, and re-check that the active definition still has lifetimebound spelling. - If multiple matching macros are active at the fix-it location, use the most recently defined one. Performance: | Case | Before 359bfe6 | 359bfe6| After Cached | |-------------------------------------------------------------|----------------:|---------------:|-------------:| | C++ no diagnostics (8k macros, 5k safe functions) | 42.5 ms | 44.2 ms | 47.0 ms | | C++ 10 diagnostics, 8k macros | 23.2 ms | 23.4 ms | 17.5 ms | | C++ 200 diagnostics, macro passed via command line option | 24.8 ms | 24.6 ms | 29.3 ms | | C++ 200 diagnostics, 8k macros | 26.3 ms | 41.7 ms | 27.9 ms | | C++ stress: 1000 diagnostics, 20k macros, no matching macro (simulating worst case scenario) | 40.8 ms | 386.7 ms | 78.9 ms | AI Usage: Performance experiment assisted by Codex. Follow up of https://github.com/llvm/llvm-project/pull/204045