[Debug-Info] handle DW_TAG_rvalue_reference_type at strict DWARF.

When -gstrict-dwarf is specified, generate DW_TAG_rvalue_reference_type
at DWARF 4 or above

Reviewed By: dblaikie, aprantl

Differential Revision: https://reviews.llvm.org/D100630

diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index fefcf7a..e8c310e 100644 (file)
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -2989,8 +2989,13 @@ llvm::DIType *CGDebugInfo::CreateType(const LValueReferenceType *Ty,
 
 llvm::DIType *CGDebugInfo::CreateType(const RValueReferenceType *Ty,
                                       llvm::DIFile *Unit) {
-  return CreatePointerLikeType(llvm::dwarf::DW_TAG_rvalue_reference_type, Ty,
-                               Ty->getPointeeType(), Unit);
+  llvm::dwarf::Tag Tag = llvm::dwarf::DW_TAG_rvalue_reference_type;
+  // DW_TAG_rvalue_reference_type was introduced in DWARF 4.
+  if (CGM.getCodeGenOpts().DebugStrictDwarf &&
+      CGM.getCodeGenOpts().DwarfVersion < 4)
+    Tag = llvm::dwarf::DW_TAG_reference_type;
+
+  return CreatePointerLikeType(Tag, Ty, Ty->getPointeeType(), Unit);
 }
 
 llvm::DIType *CGDebugInfo::CreateType(const MemberPointerType *Ty,

diff --git a/clang/test/CodeGenCXX/debug-info-rvalue-ref.cpp b/clang/test/CodeGenCXX/debug-info-rvalue-ref.cpp
index de0f65a..c9500ee 100644 (file)
--- a/clang/test/CodeGenCXX/debug-info-rvalue-ref.cpp
+++ b/clang/test/CodeGenCXX/debug-info-rvalue-ref.cpp
@@ -1,4 +1,8 @@
 // RUN: %clang_cc1 -std=c++11 -emit-llvm -debug-info-kind=limited -triple x86_64-apple-darwin %s -o - | FileCheck %s
+// RUN: %clang_cc1 -std=c++11 -dwarf-version=4 -gstrict-dwarf -emit-llvm -debug-info-kind=limited \
+// RUN:   -triple x86_64-apple-darwin %s -o - | FileCheck %s
+// RUN: %clang_cc1 -std=c++11 -dwarf-version=3 -gstrict-dwarf -emit-llvm -debug-info-kind=limited \
+// RUN:  -triple x86_64-apple-darwin %s -o - | FileCheck %s --check-prefix=NORVALUE
 
 extern "C" {
 extern int printf(const char * format, ...);
@@ -10,3 +14,4 @@ void foo (int &&i)
 
 // CHECK: !DIDerivedType(tag: DW_TAG_rvalue_reference_type, baseType: ![[INT:[0-9]+]], size: 64)
 // CHECK: ![[INT]] = !DIBasicType(name: "int"
+// NORVALUE: !DIDerivedType(tag: DW_TAG_reference_type, baseType: ![[INT:[0-9]+]], size: 64)