Introduce the core infrastructure needed to model a complete

redeclaration chain for Objective-C classes, including:
  - Using the first declaration as the canonical declaration.
  - Using the definition as the primary DeclContext
  - Making sure that all declarations have a pointer to the definition
  data, and the definition knows that it is the definition.
  - Serialization support for when a definition gets added to a
  declaration that comes from an AST file.

However, note that we're not taking advantage of much of this code
yet, because we're still re-using ObjCInterfaceDecls.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@146667 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 1 deletions

diff --git a/lib/AST/DeclObjC.cpp b/lib/AST/DeclObjC.cpp
index decbd54c6d..1da0fab0ba 100644
--- a/lib/AST/DeclObjC.cpp
+++ b/lib/AST/DeclObjC.cpp
@@ -224,7 +224,15 @@ void ObjCInterfaceDecl::mergeClassExtensionProtocolList(
 
 void ObjCInterfaceDecl::allocateDefinitionData() {
   assert(!hasDefinition() && "ObjC class already has a definition");
-  Definition = new (getASTContext()) DefinitionData();  
+  Definition.setPointer(new (getASTContext()) DefinitionData());
+  Definition.setInt(true);
+  
+  // Update all of the declarations with a pointer to the definition.
+  for (redecl_iterator RD = redecls_begin(), RDEnd = redecls_end();
+       RD != RDEnd; ++RD) {
+    if (*RD != this)
+      RD->Definition.setPointer(Definition.getPointer());
+  }
 }
 
 void ObjCInterfaceDecl::startDefinition() {