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[KeyInstr][Clang] Member initalization 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 2025-04-03 17:00:09 +01:00
parent 77f91f53a7
commit c25359bdeb
2 changed files with 23 additions and 0 deletions
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1
clang/lib/CodeGen/CGClass.cpp
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@ -1338,6 +1338,7 @@ void CodeGenFunction::EmitCtorPrologue(const CXXConstructorDecl *CD,
assert(!Member->isBaseInitializer());
assert(Member->isAnyMemberInitializer() &&
"Delegating initializer on non-delegating constructor");
ApplyAtomGroup Grp(getDebugInfo());
CM.addMemberInitializer(Member);
}
CM.finish();

22
clang/test/KeyInstructions/init-member.cpp Normal file
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@ -0,0 +1,22 @@
// RUN: %clang -gkey-instructions %s -gmlt -S -emit-llvm -o - \
// RUN: | FileCheck %s
struct B {
float y;
};
class Cls {
public:
int x = 1;
B b = {5.f};
};
void fun() {
Cls c;
}
// CHECK: store i32 1, ptr %x{{.*}}, !dbg [[G1R1:!.*]]
// CHECK: store float 5.000000e+00, ptr %y{{.*}}, !dbg [[G2R1:!.*]]
// CHECK: [[G1R1]] = !DILocation({{.*}}, atomGroup: 1, atomRank: 1)
// CHECK: [[G2R1]] = !DILocation({{.*}}, atomGroup: 2, atomRank: 1)