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[KeyInstr][Clang] Static variable init atom

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This patch is part of a stack that teaches Clang to generate Key Instructions
metadata for C and C++.

The Key Instructions project is introduced, including a "quick summary" section
at the top which adds context for this PR, here:
https://discourse.llvm.org/t/rfc-improving-is-stmt-placement-for-better-interactive-debugging/82668

The feature is only functional in LLVM if LLVM is built with CMake flag
LLVM_EXPERIMENTAL_KEY_INSTRUCTIONs. Eventually that flag will be removed.

The Clang-side work is demoed here:
https://github.com/llvm/llvm-project/pull/130943
This commit is contained in:
Orlando Cazalet-Hyams 2025-04-02 17:42:48 +01:00
parent eef73d31b6
commit a92afbf589
2 changed files with 15 additions and 1 deletions
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4
clang/lib/CodeGen/CGDecl.cpp
View File

@ -428,8 +428,10 @@ void CodeGenFunction::EmitStaticVarDecl(const VarDecl &D,
bool isCudaSharedVar = getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
D.hasAttr<CUDASharedAttr>();
// If this value has an initializer, emit it.
if (D.getInit() && !isCudaSharedVar)
if (D.getInit() && !isCudaSharedVar) {
ApplyAtomGroup Grp(getDebugInfo());
var = AddInitializerToStaticVarDecl(D, var);
}
var->setAlignment(alignment.getAsAlign());

12
clang/test/KeyInstructions/init-static.cpp Normal file
View File

@ -0,0 +1,12 @@
// RUN: %clang -gkey-instructions %s -gmlt -gcolumn-info -S -emit-llvm -o -\
// RUN: | FileCheck %s --implicit-check-not atomGroup --implicit-check-not atomRank
void g(int *a) {
// CHECK: %2 = load ptr, ptr %a.addr{{.*}}, !dbg [[G1R2:!.*]]
// CHECK: store ptr %2, ptr @_ZZ1gPiE1b{{.*}}, !dbg [[G1R1:!.*]]
static int &b = *a;
}
// CHECK: [[G1R2]] = !DILocation({{.*}}, atomGroup: 1, atomRank: 2)
// CHECK: [[G1R1]] = !DILocation({{.*}}, atomGroup: 1, atomRank: 1)