From e01e434aef4fd3190928f7e47331e6cb7f474e73 Mon Sep 17 00:00:00 2001
From: Fariborz Jahanian <fjahanian@apple.com>
Date: Wed, 30 Sep 2009 17:10:29 +0000
Subject: <rdar://problem/7263113> Make clang produce gcc's
 objc_assign_StrongCast as a result of type-cast of an ivar in assignment.

llvm-svn: 83150
---
 clang/lib/CodeGen/CGExpr.cpp | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'clang/lib/CodeGen/CGExpr.cpp')

diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index af8363dbb11b..d89da3224fc0 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -719,8 +719,18 @@ void setObjCGCLValueClass(const ASTContext &Ctx, const Expr *E, LValue &LV) {
   }
   else if (const UnaryOperator *Exp = dyn_cast<UnaryOperator>(E))
     setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV);
-  else if (const ParenExpr *Exp = dyn_cast<ParenExpr>(E))
+  else if (const ParenExpr *Exp = dyn_cast<ParenExpr>(E)) {
     setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV);
+    if (LV.isObjCIvar()) {
+      // If cast is to a structure pointer, follow gcc's behavior and make it
+      // a non-ivar write-barrier.
+      QualType ExpTy = E->getType();
+      if (ExpTy->isPointerType())
+        ExpTy = ExpTy->getAs<PointerType>()->getPointeeType();
+      if (ExpTy->isRecordType())
+        LV.SetObjCIvar(LV, false); 
+    }        
+  }
   else if (const ImplicitCastExpr *Exp = dyn_cast<ImplicitCastExpr>(E))
     setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV);
   else if (const CStyleCastExpr *Exp = dyn_cast<CStyleCastExpr>(E))
-- 
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