Bug in DIBuilder::createClassType

[KornevNikita]

Bugzilla Link	50213
Version	trunk
OS	All

Extended Description

There is bug in llvm-project/llvm/lib/IR/DIBuilder.cpp in DICompositeType *DIBuilder::createClassType function. Both methods "createClassType" and "createStructType" use the same tag - "dwarf::DW_TAG_structure_type". So both for the class and for the structure we get "DW_TAG_structure_type" in IR.
For reproduce - just call attachment with "clang -cc1 -S -emit-llvm bug_reproduce.cpp -debug-info-kind=standalone"

[llvmbot]

Obviously the C API is affected too.

I'be curious to know if the DW_TAG can be changed programmatically.
In my case the problem is that there's no LLVMDIBuilderCreateCompositeType function available
(CreateCompositeType is used by both createClassType and createStructType).

[llvmbot]

@llvm/issue-subscribers-debuginfo

Author: None (28903b80-1ea1-43c6-9221-938e8fd8bef7)

| | | | --- | --- | | Bugzilla Link | [50213](https://llvm.org/bz50213) | | Version | trunk | | OS | All |

Extended Description

There is bug in llvm-project/llvm/lib/IR/DIBuilder.cpp in DICompositeType *DIBuilder::createClassType function. Both methods "createClassType" and "createStructType" use the same tag - "dwarf::DW_TAG_structure_type". So both for the class and for the structure we get "DW_TAG_structure_type" in IR.
For reproduce - just call attachment with "clang -cc1 -S -emit-llvm bug_reproduce.cpp -debug-info-kind=standalone"

[JOE1994]

In LLVM trunk, DIBuilder::createClassType & DIBuilder::createStructType use different dwarf tags:

llvm-project/llvm/lib/IR/DIBuilder.cpp

Lines 502 to 531 in e241964

	DICompositeType *DIBuilder::createClassType(
	DIScope *Context, StringRef Name, DIFile *File, unsigned LineNumber,
	uint64_t SizeInBits, uint32_t AlignInBits, uint64_t OffsetInBits,
	DINode::DIFlags Flags, DIType *DerivedFrom, DINodeArray Elements,
	unsigned RunTimeLang, DIType *VTableHolder, MDNode *TemplateParams,
	StringRef UniqueIdentifier) {
	assert((!Context || isa<DIScope>(Context)) &&
	"createClassType should be called with a valid Context");
	auto *R = DICompositeType::get(
	VMContext, dwarf::DW_TAG_class_type, Name, File, LineNumber,
	getNonCompileUnitScope(Context), DerivedFrom, SizeInBits, AlignInBits,
	OffsetInBits, Flags, Elements, RunTimeLang, VTableHolder,
	cast_or_null<MDTuple>(TemplateParams), UniqueIdentifier);
	trackIfUnresolved(R);
	return R;
	}
	DICompositeType *DIBuilder::createStructType(
	DIScope *Context, StringRef Name, DIFile *File, unsigned LineNumber,
	uint64_t SizeInBits, uint32_t AlignInBits, DINode::DIFlags Flags,
	DIType *DerivedFrom, DINodeArray Elements, unsigned RunTimeLang,
	DIType *VTableHolder, StringRef UniqueIdentifier) {
	auto *R = DICompositeType::get(
	VMContext, dwarf::DW_TAG_structure_type, Name, File, LineNumber,
	getNonCompileUnitScope(Context), DerivedFrom, SizeInBits, AlignInBits, 0,
	Flags, Elements, RunTimeLang, VTableHolder, nullptr, UniqueIdentifier);
	trackIfUnresolved(R);
	return R;
	}