Actually support DW_TAG_rvalue_reference_type that we were trying

to generate out of the front end.

rdar://11479676

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157094 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/DIBuilder.h

@@ -127,8 +127,8 @@ namespace llvm {
                              StringRef Name = StringRef());
 
     /// createReferenceType - Create debugging information entry for a c++
-    /// style reference.
-    DIType createReferenceType(DIType RTy);
+    /// style reference or rvalue reference type.
+    DIType createReferenceType(unsigned Tag, DIType RTy);
 
     /// createTypedef - Create debugging information entry for a typedef.
     /// @param Ty          Original type.

lib/Analysis/DIBuilder.cpp

@@ -229,12 +229,13 @@ DIType DIBuilder::createPointerType(DIType PointeeTy, uint64_t SizeInBits,
   return DIType(MDNode::get(VMContext, Elts));
 }
 
-/// createReferenceType - Create debugging information entry for a reference.
-DIType DIBuilder::createReferenceType(DIType RTy) {
+/// createReferenceType - Create debugging information entry for a reference
+/// type.
+DIType DIBuilder::createReferenceType(unsigned Tag, DIType RTy) {
   assert(RTy.Verify() && "Unable to create reference type");
   // References are encoded in DIDerivedType format.
   Value *Elts[] = {
-    GetTagConstant(VMContext, dwarf::DW_TAG_reference_type),
+    GetTagConstant(VMContext, Tag),
     NULL, // TheCU,
     NULL, // Name
     NULL, // Filename

lib/Analysis/DebugInfo.cpp

@@ -150,6 +150,7 @@ bool DIDescriptor::isDerivedType() const {
   case dwarf::DW_TAG_typedef:
   case dwarf::DW_TAG_pointer_type:
   case dwarf::DW_TAG_reference_type:
+  case dwarf::DW_TAG_rvalue_reference_type:
   case dwarf::DW_TAG_const_type:
   case dwarf::DW_TAG_volatile_type:
   case dwarf::DW_TAG_restrict_type:
@@ -399,11 +400,13 @@ bool DIType::Verify() const {
   unsigned Tag = getTag();
   if (!isBasicType() && Tag != dwarf::DW_TAG_const_type &&
       Tag != dwarf::DW_TAG_volatile_type && Tag != dwarf::DW_TAG_pointer_type &&
-      Tag != dwarf::DW_TAG_reference_type && Tag != dwarf::DW_TAG_restrict_type 
-      && Tag != dwarf::DW_TAG_vector_type && Tag != dwarf::DW_TAG_array_type
-      && Tag != dwarf::DW_TAG_enumeration_type 
-      && Tag != dwarf::DW_TAG_subroutine_type
-      && getFilename().empty())
+      Tag != dwarf::DW_TAG_reference_type &&
+      Tag != dwarf::DW_TAG_rvalue_reference_type &&
+      Tag != dwarf::DW_TAG_restrict_type && Tag != dwarf::DW_TAG_vector_type &&
+      Tag != dwarf::DW_TAG_array_type &&
+      Tag != dwarf::DW_TAG_enumeration_type &&
+      Tag != dwarf::DW_TAG_subroutine_type &&
+      getFilename().empty())
     return false;
   return true;
 }
@@ -512,7 +515,8 @@ uint64_t DIDerivedType::getOriginalTypeSize() const {
     // it's a reference then it's just the size of the field. Pointer types
     // have no need of this since they're a different type of qualification
     // on the type.
-    if (BaseType.getTag() == dwarf::DW_TAG_reference_type)
+    if (BaseType.getTag() == dwarf::DW_TAG_reference_type ||
+        BaseType.getTag() == dwarf::DW_TAG_rvalue_reference_type)
       return getSizeInBits();
     else if (BaseType.isDerivedType())
       return DIDerivedType(BaseType).getOriginalTypeSize();

test/DebugInfo/X86/rvalue-ref.ll

@@ -0,0 +1,40 @@
+; RUN: llc -mtriple=x86_64-apple-darwin %s -o %t -filetype=obj -O0
+; RUN: llvm-dwarfdump %t | FileCheck %s
+
+; CHECK: DW_TAG_rvalue_reference_type
+
+@.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
+
+define void @_Z3fooOi(i32* %i) uwtable ssp {
+entry:
+  %i.addr = alloca i32*, align 8
+  store i32* %i, i32** %i.addr, align 8
+  call void @llvm.dbg.declare(metadata !{i32** %i.addr}, metadata !11), !dbg !12
+  %0 = load i32** %i.addr, align 8, !dbg !13
+  %1 = load i32* %0, align 4, !dbg !13
+  %call = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([4 x i8]* @.str, i32 0, i32 0), i32 %1), !dbg !13
+  ret void, !dbg !15
+}
+
+declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
+
+declare i32 @printf(i8*, ...)
+
+!llvm.dbg.cu = !{!0}
+
+!0 = metadata !{i32 786449, i32 0, i32 4, metadata !"foo.cpp", metadata !"/Users/echristo/tmp", metadata !"clang version 3.2 (trunk 157054) (llvm/trunk 157060)", i1 true, i1 false, metadata !"", i32 0, metadata !1, metadata !1, metadata !3, metadata !1} ; [ DW_TAG_compile_unit ]
+!1 = metadata !{metadata !2}
+!2 = metadata !{i32 0}
+!3 = metadata !{metadata !4}
+!4 = metadata !{metadata !5}
+!5 = metadata !{i32 786478, i32 0, metadata !6, metadata !"foo", metadata !"foo", metadata !"_Z3fooOi", metadata !6, i32 4, metadata !7, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void (i32*)* @_Z3fooOi, null, null, metadata !1, i32 5} ; [ DW_TAG_subprogram ]
+!6 = metadata !{i32 786473, metadata !"foo.cpp", metadata !"/Users/echristo/tmp", null} ; [ DW_TAG_file_type ]
+!7 = metadata !{i32 786453, i32 0, metadata !"", i32 0, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !8, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
+!8 = metadata !{null, metadata !9}
+!9 = metadata !{i32 786498, null, null, null, i32 0, i64 0, i64 0, i64 0, i32 0, metadata !10} ; [ DW_TAG_rvalue_reference_type ]
+!10 = metadata !{i32 786468, null, metadata !"int", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
+!11 = metadata !{i32 786689, metadata !5, metadata !"i", metadata !6, i32 16777220, metadata !9, i32 0, i32 0} ; [ DW_TAG_arg_variable ]
+!12 = metadata !{i32 4, i32 17, metadata !5, null}
+!13 = metadata !{i32 6, i32 3, metadata !14, null}
+!14 = metadata !{i32 786443, metadata !5, i32 5, i32 1, metadata !6, i32 0} ; [ DW_TAG_lexical_block ]
+!15 = metadata !{i32 7, i32 1, metadata !14, null}