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[DebugInfo] Ensure complete type is emitted with -fstandalone-debug 

The logic for upgrading a class from a forward decl to a complete type
was not checking the debug info emission level before applying the
vtable optimization. This meant we ended up without debug info for a
class which was required to be complete. I noticed it because it
triggered an assertion during CodeView emission, but that's a separate
issue.

llvm-svn: 281057
This commit is contained in:
Reid Kleckner 2016-09-09 17:03:53 +00:00
parent b6bee5164d
commit 22466a92e1
2 changed files with 31 additions and 6 deletions
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10
clang/lib/CodeGen/CGDebugInfo.cpp
View File

@ -1648,9 +1648,13 @@ void CGDebugInfo::completeRequiredType(const RecordDecl *RD) {
if (DebugKind <= codegenoptions::DebugLineTablesOnly)
return;
if (const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD))
if (CXXDecl->isDynamicClass())
return;
// If this is a dynamic class and we're emitting limited debug info, wait
// until the vtable is emitted to complete the class debug info.
if (DebugKind <= codegenoptions::LimitedDebugInfo) {
if (const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD))
if (CXXDecl->isDynamicClass())
return;
}
if (DebugTypeExtRefs && RD->isFromASTFile())
return;

27
clang/test/CodeGenCXX/debug-info-class-nolimit.cpp
View File

@ -1,8 +1,29 @@
// RUN: %clang_cc1 -triple x86_64-unk-unk -debug-info-kind=standalone -o - -emit-llvm %s | FileCheck %s
// On Darwin, "full" debug info is the default, so really these tests are
// identical, as cc1 no longer chooses the effective value of DebugInfoKind.
// RUN: %clang_cc1 -triple x86_64-apple-darwin -debug-info-kind=standalone -o - -emit-llvm %s | FileCheck %s
// We had a bug in -fstandalone-debug where UnicodeString would not be completed
// when it was required to be complete. This orginally manifested as an
// assertion in CodeView emission on Windows with some dllexport stuff, but it's
// more general than that.
struct UnicodeString;
struct GetFwdDecl {
static UnicodeString format;
};
GetFwdDecl force_fwd_decl;
struct UnicodeString {
private:
virtual ~UnicodeString();
};
struct UseCompleteType {
UseCompleteType();
~UseCompleteType();
UnicodeString currencySpcAfterSym[1];
};
UseCompleteType require_complete;
// CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "UnicodeString"
// CHECK-NOT: DIFlagFwdDecl
// CHECK-SAME: ){{$}}
namespace rdar14101097_1 { // see also PR16214
// Check that we emit debug info for the definition of a struct if the
// definition is available, even if it's used via a pointer wrapped in a