From: Michael Gottesman <mgottesman@apple.com>
Date: Sun, 6 Jan 2013 21:54:30 +0000 (+0000)
Subject: Added 2x Debug statements to ObjCARC that log when we handle the two undefined pointe... 
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e549492c3680814b31058b183d315d69fd9293de;p=oota-llvm.git

Added 2x Debug statements to ObjCARC that log when we handle the two undefined pointer-to-weak-pointer is NULL cases by replacing the given call inst with an undefined value.

The reason that there are two cases is that the first case handles the unary cases and the second the binary cases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171672 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Scalar/ObjCARC.cpp b/lib/Transforms/Scalar/ObjCARC.cpp
index e68f2add73b..43f95191c6a 100644
--- a/lib/Transforms/Scalar/ObjCARC.cpp
+++ b/lib/Transforms/Scalar/ObjCARC.cpp
@@ -2361,7 +2361,13 @@ void ObjCARCOpt::OptimizeIndividualCalls(Function &F) {
         new StoreInst(UndefValue::get(cast<PointerType>(Ty)->getElementType()),
                       Constant::getNullValue(Ty),
                       CI);
-        CI->replaceAllUsesWith(UndefValue::get(CI->getType()));
+        llvm::Value *NewValue = UndefValue::get(CI->getType());        
+        DEBUG(dbgs() << "ObjCARCOpt::OptimizeIndividualCalls: A null "
+                        "pointer-to-weak-pointer is undefined behavior.\n"
+                        "                                     Old = " << *CI <<
+                        "\n                                     New = " <<
+                        *NewValue << "\n");        
+        CI->replaceAllUsesWith(NewValue);
         CI->eraseFromParent();
         continue;
       }
@@ -2377,7 +2383,15 @@ void ObjCARCOpt::OptimizeIndividualCalls(Function &F) {
         new StoreInst(UndefValue::get(cast<PointerType>(Ty)->getElementType()),
                       Constant::getNullValue(Ty),
                       CI);
-        CI->replaceAllUsesWith(UndefValue::get(CI->getType()));
+
+        llvm::Value *NewValue = UndefValue::get(CI->getType());
+        DEBUG(dbgs() << "ObjCARCOpt::OptimizeIndividualCalls: A null "
+                        "pointer-to-weak-pointer is undefined behavior.\n"
+                        "                                     Old = " << *CI <<
+                        "\n                                     New = " <<
+                        *NewValue << "\n");
+        
+        CI->replaceAllUsesWith(NewValue);
         CI->eraseFromParent();
         continue;
       }