From 5581115075e688bdf44920f6b93dd42e94c3ccf6 Mon Sep 17 00:00:00 2001
From: Michael Gottesman <mgottesman@apple.com>
Date: Wed, 9 Jan 2013 19:23:24 +0000
Subject: [PATCH] [ObjCARC Debug Messages] This is a squashed commit of 3x
 debug message commits ala echristo's suggestion.

1. Added debug messages when in OptimizeIndividualCalls we move calls into predecessors and then erase the original call.
2. Added debug messages when in the process of moving calls in ObjCARCOpt::MoveCalls we create new RR and delete old RR.
3. Added a debug message when we visit a specific retain instruction in ObjCARCOpt::PerformCodePlacement.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171988 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/ObjCARC.cpp | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/lib/Transforms/Scalar/ObjCARC.cpp b/lib/Transforms/Scalar/ObjCARC.cpp
index e6ec841aa5b..8eb9d19939e 100644
--- a/lib/Transforms/Scalar/ObjCARC.cpp
+++ b/lib/Transforms/Scalar/ObjCARC.cpp
@@ -2562,10 +2562,16 @@ void ObjCARCOpt::OptimizeIndividualCalls(Function &F) {
                 Op = new BitCastInst(Op, ParamTy, "", InsertPos);
               Clone->setArgOperand(0, Op);
               Clone->insertBefore(InsertPos);
+
+              DEBUG(dbgs() << "ObjCARCOpt::OptimizeIndividualCalls: Cloning "
+                           << *CInst << "\n"
+                           "                                     And inserting "
+                           "clone at " << *InsertPos << "\n");
               Worklist.push_back(std::make_pair(Clone, Incoming));
             }
           }
           // Erase the original call.
+          DEBUG(dbgs() << "Erasing: " << *CInst << "\n");
           EraseInstruction(CInst);
           continue;
         }
@@ -3226,6 +3232,11 @@ void ObjCARCOpt::MoveCalls(Value *Arg,
                         MDNode::get(M->getContext(), ArrayRef<Value *>()));
     else
       Call->setTailCall();
+
+    DEBUG(dbgs() << "ObjCARCOpt::MoveCalls: Inserting new Release: " << *Call
+                 << "\n"
+                    "                       At insertion point: " << *InsertPt
+                 << "\n");
   }
   for (SmallPtrSet<Instruction *, 2>::const_iterator
        PI = RetainsToMove.ReverseInsertPts.begin(),
@@ -3241,6 +3252,11 @@ void ObjCARCOpt::MoveCalls(Value *Arg,
     Call->setDoesNotThrow();
     if (ReleasesToMove.IsTailCallRelease)
       Call->setTailCall();
+
+    DEBUG(dbgs() << "ObjCARCOpt::MoveCalls: Inserting new Retain: " << *Call
+                 << "\n"
+                    "                       At insertion point: " << *InsertPt
+                 << "\n");
   }
 
   // Delete the original retain and release calls.
@@ -3250,6 +3266,8 @@ void ObjCARCOpt::MoveCalls(Value *Arg,
     Instruction *OrigRetain = *AI;
     Retains.blot(OrigRetain);
     DeadInsts.push_back(OrigRetain);
+    DEBUG(dbgs() << "ObjCARCOpt::MoveCalls: Deleting retain: " << *OrigRetain <<
+                    "\n");
   }
   for (SmallPtrSet<Instruction *, 2>::const_iterator
        AI = ReleasesToMove.Calls.begin(),
@@ -3257,6 +3275,8 @@ void ObjCARCOpt::MoveCalls(Value *Arg,
     Instruction *OrigRelease = *AI;
     Releases.erase(OrigRelease);
     DeadInsts.push_back(OrigRelease);
+    DEBUG(dbgs() << "ObjCARCOpt::MoveCalls: Deleting release: " << *OrigRelease
+                 << "\n");
   }
 }
 
@@ -3282,6 +3302,10 @@ ObjCARCOpt::PerformCodePlacement(DenseMap<const BasicBlock *, BBState>
     if (!V) continue; // blotted
 
     Instruction *Retain = cast<Instruction>(V);
+
+    DEBUG(dbgs() << "ObjCARCOpt::PerformCodePlacement: Visiting: " << *Retain
+          << "\n");
+
     Value *Arg = GetObjCArg(Retain);
 
     // If the object being released is in static or stack storage, we know it's