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DebugInfo: PR19298: function local const variables duplicated in the root scope 

See the comment for CodeGenFunction::tryEmitAsConstant that describes
how in some contexts (lambdas) we must not emit references to the
variable, but instead use the constant directly - because of this we end
up emitting a constant for the variable, as well as emitting the
variable itself.

Should we just skip putting the variable on the stack at all and omit
the debug info for the constant? It's not clear to me - what if the
address of the local is taken?

llvm-svn: 205651
This commit is contained in:
David Blaikie 2014-04-04 20:56:17 +00:00
parent f4c9e49f94
commit a1556556d6
2 changed files with 13 additions and 6 deletions
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3
clang/lib/CodeGen/CGDebugInfo.cpp
View File

@ -3227,6 +3227,9 @@ void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD,
// Do not use DIGlobalVariable for enums.
if (Ty.getTag() == llvm::dwarf::DW_TAG_enumeration_type)
return;
// Do not emit separate definitions for function local const/statics.
if (isa<FunctionDecl>(VD->getDeclContext()))
return;
llvm::DIGlobalVariable GV = DBuilder.createStaticVariable(
Unit, Name, Name, Unit, getLineNumber(VD->getLocation()), Ty, true, Init,
getOrCreateStaticDataMemberDeclarationOrNull(cast<VarDecl>(VD)));

16
clang/test/CodeGenCXX/debug-info.cpp
View File

@ -51,11 +51,6 @@ namespace VirtualBase {
}
}
void foo() {
const wchar_t c = L'x';
wchar_t d = c;
}
namespace b5249287 {
template <typename T> class A {
struct B;
@ -88,6 +83,13 @@ foo func(foo f) {
// CHECK: [[FUNC:![0-9]*]] = {{.*}} metadata !"_ZN7pr147634funcENS_3fooE", i32 {{[0-9]*}}, metadata [[FUNC_TYPE:![0-9]*]], {{.*}} ; [ DW_TAG_subprogram ] {{.*}} [def] [func]
}
void foo() {
const wchar_t c = L'x';
wchar_t d = c;
}
// CHECK-NOT: ; [ DW_TAG_variable ] [c]
namespace pr9608 { // also pr9600
struct incomplete;
incomplete (*x)[3];
@ -96,9 +98,11 @@ incomplete (*x)[3];
// CHECK: [[INCARRAY]] = {{.*}}metadata !"_ZTSN6pr960810incompleteE", metadata {{![0-9]*}}, i32 0, null, null, null} ; [ DW_TAG_array_type ] [line 0, size 0, align 0, offset 0] [from _ZTSN6pr960810incompleteE]
}
// For some reason the argument for PR14763 ended up all the way down here
// For some reason function arguments ended up down here
// CHECK: = metadata !{i32 {{[0-9]*}}, metadata [[FUNC]], {{.*}}, metadata !"[[FOO]]", i32 8192, i32 0} ; [ DW_TAG_arg_variable ] [f]
// CHECK: ; [ DW_TAG_auto_variable ] [c]
namespace pr16214 {
struct a {
int i;