[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

1 files changed, 24 insertions, 0 deletions

diff --git a/lib/Transforms/Scalar/ObjCARC.cpp b/lib/Transforms/Scalar/ObjCARC.cpp
index e6ec841..8eb9d19 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