Generate objc_read_weak for __weak objc loads.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@59553 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 1 deletions

diff --git a/lib/CodeGen/CGObjCMac.cpp b/lib/CodeGen/CGObjCMac.cpp
index 1591831458..f3cf21eb31 100644
--- a/lib/CodeGen/CGObjCMac.cpp
+++ b/lib/CodeGen/CGObjCMac.cpp
@@ -454,7 +454,8 @@ public:
                              const ObjCAtThrowStmt &S);
   virtual void EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
                                     const ObjCAtSynchronizedStmt &S);
-  
+  virtual llvm::Value * EmitObjCWeakCall(CodeGen::CodeGenFunction &CGF,
+                                         llvm::Value *AddrWeakObj); 
 };
 } // end anonymous namespace
 
@@ -1775,6 +1776,17 @@ void CodeGenFunction::EmitJumpThroughFinally(ObjCEHEntry *E,
   EmitBranch(ExecuteTryExit ? E->FinallyBlock : E->FinallyNoExit);
 }
 
+/// EmitObjCWeakCall - Code gen for loading value of a __weak
+/// object: objc_read_weak (id *src)
+///
+llvm::Value * CGObjCMac::EmitObjCWeakCall(CodeGen::CodeGenFunction &CGF,
+                                          llvm::Value *AddrWeakObj)
+{
+  llvm::Value *read_weak = CGF.Builder.CreateCall(ObjCTypes.GcReadWeakFn,
+                                                  AddrWeakObj, "weakobj");
+  return read_weak;
+}
+
 /// EmitSynchronizedStmt - Code gen for @synchronized(expr) stmt;
 /// Effectively generating code for:
 /// objc_sync_enter(expr);