Add support for a temporary forward decl type. We want this so we
can rauw forward declarations if we decide to emit the full type.
Part of rdar://10809898
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150024 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm/Analysis/DIBuilder.h b/include/llvm/Analysis/DIBuilder.h
index 666ca58..3785fa8 100644
--- a/include/llvm/Analysis/DIBuilder.h
+++ b/include/llvm/Analysis/DIBuilder.h
@@ -341,6 +341,10 @@
DIType createTemporaryType();
DIType createTemporaryType(DIFile F);
+ /// createForwardDecl - Create a temporary forward-declared type.
+ DIType createForwardDecl(unsigned Tag, StringRef Name, DIFile F,
+ unsigned Line);
+
/// retainType - Retain DIType in a module even if it is not referenced
/// through debug info anchors.
void retainType(DIType T);
diff --git a/lib/Analysis/DIBuilder.cpp b/lib/Analysis/DIBuilder.cpp
index 4560371..53a293a 100644
--- a/lib/Analysis/DIBuilder.cpp
+++ b/lib/Analysis/DIBuilder.cpp
@@ -669,6 +669,28 @@
return DIType(Node);
}
+/// createForwardDecl - Create a temporary forward-declared type that
+/// can be RAUW'd if the full type is seen.
+DIType DIBuilder::createForwardDecl(unsigned Tag, StringRef Name, DIFile F,
+ unsigned Line) {
+ // Create a temporary MDNode.
+ Value *Elts[] = {
+ GetTagConstant(VMContext, Tag),
+ NULL, // TheCU
+ MDString::get(VMContext, Name),
+ F,
+ ConstantInt::get(Type::getInt32Ty(VMContext), Line),
+ // To ease transition include sizes etc of 0.
+ ConstantInt::get(Type::getInt32Ty(VMContext), 0),
+ ConstantInt::get(Type::getInt32Ty(VMContext), 0),
+ ConstantInt::get(Type::getInt32Ty(VMContext), 0),
+ ConstantInt::get(Type::getInt32Ty(VMContext),
+ DIDescriptor::FlagFwdDecl)
+ };
+ MDNode *Node = MDNode::getTemporary(VMContext, Elts);
+ return DIType(Node);
+}
+
/// getOrCreateArray - Get a DIArray, create one if required.
DIArray DIBuilder::getOrCreateArray(ArrayRef<Value *> Elements) {
if (Elements.empty()) {