Add support to create class type.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121279 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 46 insertions, 0 deletions

diff --git a/lib/Analysis/DIBuilder.cpp b/lib/Analysis/DIBuilder.cpp
index c9a4229db4..658b3774af 100644
--- a/lib/Analysis/DIBuilder.cpp
+++ b/lib/Analysis/DIBuilder.cpp
@@ -236,6 +236,32 @@ DIType DIBuilder::CreateMemberType(StringRef Name,
   return DIType(MDNode::get(VMContext, &Elts[0], array_lengthof(Elts)));
 }
 
+/// CreateClassType - Create debugging information entry for a class.
+DIType DIBuilder::CreateClassType(DIDescriptor Context, StringRef Name, 
+                                  DIFile File, unsigned LineNumber, 
+                                  uint64_t SizeInBits, uint64_t AlignInBits,
+                                  uint64_t OffsetInBits, unsigned Flags,
+                                  DIType DerivedFrom, DIArray Elements,
+                                  MDNode *VTableHoder) {
+ // TAG_class_type is encoded in DICompositeType format.
+  Value *Elts[] = {
+    GetTagConstant(VMContext, dwarf::DW_TAG_class_type),
+    Context,
+    MDString::get(VMContext, Name),
+    File,
+    ConstantInt::get(Type::getInt32Ty(VMContext), LineNumber),
+    ConstantInt::get(Type::getInt64Ty(VMContext), SizeInBits),
+    ConstantInt::get(Type::getInt64Ty(VMContext), AlignInBits),
+    ConstantInt::get(Type::getInt32Ty(VMContext), OffsetInBits),
+    ConstantInt::get(Type::getInt32Ty(VMContext), Flags),
+    DerivedFrom,
+    Elements,
+    ConstantInt::get(Type::getInt32Ty(VMContext), 0),
+    VTableHoder
+  };
+  return DIType(MDNode::get(VMContext, &Elts[0], array_lengthof(Elts)));
+}
+
 /// CreateStructType - Create debugging information entry for a struct.
 DIType DIBuilder::CreateStructType(DIDescriptor Context, StringRef Name, 
                                    DIFile File, unsigned LineNumber, 
diff --git a/lib/Analysis/DebugInfo.cpp b/lib/Analysis/DebugInfo.cpp
index f968d06195..9e802c64b0 100644
--- a/lib/Analysis/DebugInfo.cpp
+++ b/lib/Analysis/DebugInfo.cpp
@@ -288,6 +288,26 @@ void DIType::replaceAllUsesWith(DIDescriptor &D) {
   }
 }
 
+/// replaceAllUsesWith - Replace all uses of debug info referenced by
+/// this descriptor.
+void DIType::replaceAllUsesWith(MDNode *D) {
+  if (!DbgNode)
+    return;
+
+  // Since we use a TrackingVH for the node, its easy for clients to manufacture
+  // legitimate situations where they want to replaceAllUsesWith() on something
+  // which, due to uniquing, has merged with the source. We shield clients from
+  // this detail by allowing a value to be replaced with replaceAllUsesWith()
+  // itself.
+  if (DbgNode != D) {
+    MDNode *Node = const_cast<MDNode*>(DbgNode);
+    const MDNode *DN = D;
+    const Value *V = cast_or_null<Value>(DN);
+    Node->replaceAllUsesWith(const_cast<Value*>(V));
+    MDNode::deleteTemporary(Node);
+  }
+}
+
 /// Verify - Verify that a compile unit is well formed.
 bool DICompileUnit::Verify() const {
   if (!DbgNode)