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Debug Info: for static member variables, add AT_MIPS_linkage_name to the

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definition DIE, to make old GDB happy.

We have a regression for old GDB when Clang uses DW_TAG_member to declare
static members inside a class, instead of DW_TAG_variable. This patch will fix
this regression.

rdar://problem/13291234

llvm-svn: 176143
This commit is contained in:
Manman Ren 2013-02-27 00:02:32 +00:00
parent 149b81ab7e
commit 1d8fd8cd0b
2 changed files with 10 additions and 1 deletions
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8
lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
View File

@ -1348,9 +1348,15 @@ void CompileUnit::createGlobalVariableDIE(const MDNode *N) {
}
// Add linkage name.
StringRef LinkageName = GV.getLinkageName();
if (!LinkageName.empty() && isGlobalVariable)
if (!LinkageName.empty() && isGlobalVariable) {
addString(VariableDIE, dwarf::DW_AT_MIPS_linkage_name,
getRealLinkageName(LinkageName));
// To make old GDB happy, for static member variables, we add
// AT_MIPS_linkage_name to the definition DIE as well.
if (IsStaticMember && VariableSpecDIE)
addString(VariableSpecDIE, dwarf::DW_AT_MIPS_linkage_name,
getRealLinkageName(LinkageName));
}
} else if (const ConstantInt *CI =
dyn_cast_or_null<ConstantInt>(GV.getConstant())) {
// AT_const_value was added when the static memeber was created. To avoid

3
test/DebugInfo/X86/debug-info-static-member.ll
View File

@ -131,12 +131,15 @@ declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
; PRESENT: DW_TAG_variable
; PRESENT-NEXT: DW_AT_specification {{.*}} {0x[[DECL_A]]}
; PRESENT-NEXT: DW_AT_location
; PRESENT-NEXT: DW_AT_MIPS_linkage_name {{.*}} "_ZN1C1aE"
; PRESENT: DW_TAG_variable
; PRESENT-NEXT: DW_AT_specification {{.*}} {0x[[DECL_B]]}
; PRESENT-NEXT: DW_AT_location
; PRESENT-NEXT: DW_AT_MIPS_linkage_name {{.*}} "_ZN1C1bE"
; PRESENT: DW_TAG_variable
; PRESENT-NEXT: DW_AT_specification {{.*}} {0x[[DECL_C]]}
; PRESENT-NEXT: DW_AT_location
; PRESENT-NEXT: DW_AT_MIPS_linkage_name {{.*}} "_ZN1C1cE"
; ABSENT verifies that static member declarations do not have either
; DW_AT_location or DW_AT_data_member_location; also, variables do not