[llvm-commits] [llvm] r150024 - in /llvm/trunk: include/llvm/Analysis/DIBuilder.h lib/Analysis/DIBuilder.cpp

[Eric Christopher]

Author: echristo
Date: Tue Feb  7 18:22:26 2012
New Revision: 150024

URL: http://llvm.org/viewvc/llvm-project?rev=150024&view=rev
Log:
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

Modified:
    llvm/trunk/include/llvm/Analysis/DIBuilder.h
    llvm/trunk/lib/Analysis/DIBuilder.cpp

Modified: llvm/trunk/include/llvm/Analysis/DIBuilder.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Analysis/DIBuilder.h?rev=150024&r1=150023&r2=150024&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Analysis/DIBuilder.h (original)
+++ llvm/trunk/include/llvm/Analysis/DIBuilder.h Tue Feb  7 18:22:26 2012
@@ -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);

Modified: llvm/trunk/lib/Analysis/DIBuilder.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/DIBuilder.cpp?rev=150024&r1=150023&r2=150024&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/DIBuilder.cpp (original)
+++ llvm/trunk/lib/Analysis/DIBuilder.cpp Tue Feb  7 18:22:26 2012
@@ -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()) {