Introduce a new temporary MDNode concept. Temporary MDNodes are
not part of the IR, are not uniqued, and may be safely RAUW'd.
This replaces a variety of alternate mechanisms for achieving
the same effect.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111681 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/DebugInfo.cpp b/lib/Analysis/DebugInfo.cpp
index 1b9008c..065a00a 100644
--- a/lib/Analysis/DebugInfo.cpp
+++ b/lib/Analysis/DebugInfo.cpp
@@ -22,6 +22,7 @@
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/raw_ostream.h"
@@ -260,7 +261,7 @@
/// replaceAllUsesWith - Replace all uses of debug info referenced by
/// this descriptor.
-void DIDerivedType::replaceAllUsesWith(DIDescriptor &D) {
+void DIType::replaceAllUsesWith(DIDescriptor &D) {
if (!DbgNode)
return;
@@ -274,6 +275,7 @@
const MDNode *DN = D;
const Value *V = cast_or_null<Value>(DN);
Node->replaceAllUsesWith(const_cast<Value*>(V));
+ MDNode::deleteTemporary(Node);
}
}
@@ -934,6 +936,18 @@
}
+/// CreateTemporaryType - Create a temporary forward-declared type.
+DIType DIFactory::CreateTemporaryType(DIDescriptor Context) {
+ // Give the temporary MDNode a tag. It doesn't matter what tag we
+ // use here as long as DIType accepts it.
+ Value *Elts[] = {
+ GetTagConstant(DW_TAG_base_type)
+ };
+ MDNode *Node = MDNode::getTemporary(VMContext, Elts, array_lengthof(Elts));
+ return DIType(Node);
+}
+
+
/// CreateCompositeType - Create a composite type like array, struct, etc.
DICompositeType DIFactory::CreateCompositeTypeEx(unsigned Tag,
DIDescriptor Context,