[all-commits] [llvm/llvm-project] da9c51: [CIR][LoweringPrepare] Emit guard variables for st...

[Bruno Cardoso Lopes via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: da9c513c87b2fbd32e32e4122dec9ce437f0b9b6
      https://github.com/llvm/llvm-project/commit/da9c513c87b2fbd32e32e4122dec9ce437f0b9b6
  Author: Bruno Cardoso Lopes <bruno.cardoso at gmail.com>
  Date:   2026-02-13 (Fri, 13 Feb 2026)

  Changed paths:
    M clang/include/clang/CIR/Dialect/IR/CIRAttrs.td
    M clang/include/clang/CIR/Dialect/IR/CIROps.td
    M clang/include/clang/CIR/Interfaces/ASTAttrInterfaces.h
    M clang/include/clang/CIR/Interfaces/ASTAttrInterfaces.td
    M clang/include/clang/CIR/MissingFeatures.h
    M clang/lib/CIR/CodeGen/CIRGenDeclCXX.cpp
    M clang/lib/CIR/CodeGen/CIRGenModule.cpp
    M clang/lib/CIR/Dialect/IR/CIRDialect.cpp
    M clang/lib/CIR/Dialect/Transforms/LoweringPrepare.cpp
    M clang/test/CIR/CodeGen/static-local.cpp
    M clang/test/CIR/IR/invalid-static-local.cir
    M clang/test/CIR/IR/static-local.cir

  Log Message:
  -----------
  [CIR][LoweringPrepare] Emit guard variables for static local initialization (#179828)

This implements the lowering of static local variables with the Itanium C++ ABI
guard variable pattern in LoweringPrepare. This is initial support, errorNYI covering all that hasn't been added just yet.

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

Once the new design doc lands I'll add more information over there.



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