[all-commits] [llvm/llvm-project] 2d84c7: [CIR][LoweringPrepare] Emit guard variables for st...

[Bruno Cardoso Lopes via All-commits]

  Branch: refs/heads/users/bcardosolopes/cir-static-local-lowprep
  Home:   https://github.com/llvm/llvm-project
  Commit: 2d84c7716453b8dffb848f85823727b04dd125e4
      https://github.com/llvm/llvm-project/commit/2d84c7716453b8dffb848f85823727b04dd125e4
  Author: Bruno Cardoso Lopes <bruno.cardoso at gmail.com>
  Date:   2026-01-30 (Fri, 30 Jan 2026)

  Changed paths:
    M clang/include/clang/CIR/MissingFeatures.h
    M clang/lib/CIR/Dialect/Transforms/LoweringPrepare.cpp
    M clang/test/CIR/CodeGen/static-local.cpp

  Log Message:
  -----------
  [CIR][LoweringPrepare] Emit guard variables for static local initialization

This implements the lowering of static local variables with the Itanium C++ ABI
guard variable pattern in LoweringPrepare.

When a GlobalOp has the static_local attribute and a ctor region, this pass:
1. Creates a guard variable global (mangled name from AST)
2. Inserts the guard check pattern at each GetGlobalOp use site:
   - Load guard byte with acquire ordering
   - If zero, call __cxa_guard_acquire
   - If acquire returns non-zero, inline the ctor region code
   - Call __cxa_guard_release
3. Clears the static_local attribute and ctor region from the GlobalOp



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