diff options
| author | Dan Gohman <gohman@apple.com> | 2012-03-02 01:26:46 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2012-03-02 01:26:46 +0000 |
| commit | 362eb69f24513ea181b72f7ef7d90f2ed47c08a1 (patch) | |
| tree | 46cbc02182d03fbe69ecae9698873af03ada292a /llvm/lib | |
| parent | 8dfdd89433540a0d7447e76cb977462ddb4c4f3d (diff) | |
| download | bcm5719-llvm-362eb69f24513ea181b72f7ef7d90f2ed47c08a1.tar.gz bcm5719-llvm-362eb69f24513ea181b72f7ef7d90f2ed47c08a1.zip | |
Fix an iterator invalidation problem. operator[] on a DenseMap
can insert a new element, invalidating iterators. Use find
instead, and handle the case where the key is not found explicitly.
llvm-svn: 151871
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/ObjCARC.cpp | 36 |
1 files changed, 28 insertions, 8 deletions
diff --git a/llvm/lib/Transforms/Scalar/ObjCARC.cpp b/llvm/lib/Transforms/Scalar/ObjCARC.cpp index cb0eddd2f4c..1c7f036232e 100644 --- a/llvm/lib/Transforms/Scalar/ObjCARC.cpp +++ b/llvm/lib/Transforms/Scalar/ObjCARC.cpp @@ -2421,12 +2421,22 @@ ObjCARCOpt::CheckForCFGHazards(const BasicBlock *BB, --SE; for (; SI != SE; ++SI) { - PtrState &SuccS = BBStates[*SI].getPtrBottomUpState(Arg); - switch (SuccS.GetSeq()) { + Sequence SuccSSeq = S_None; + bool SuccSRRIKnownSafe = false; + // If VisitBottomUp has visited this successor, take what we know about it. + DenseMap<const BasicBlock *, BBState>::iterator BBI = BBStates.find(*SI); + if (BBI != BBStates.end()) { + const PtrState &SuccS = BBI->second.getPtrBottomUpState(Arg); + SuccSSeq = SuccS.GetSeq(); + SuccSRRIKnownSafe = SuccS.RRI.KnownSafe; + } + switch (SuccSSeq) { case S_None: case S_CanRelease: { - if (!S.RRI.KnownSafe && !SuccS.RRI.KnownSafe) + if (!S.RRI.KnownSafe && !SuccSRRIKnownSafe) { S.ClearSequenceProgress(); + break; + } continue; } case S_Use: @@ -2435,7 +2445,7 @@ ObjCARCOpt::CheckForCFGHazards(const BasicBlock *BB, case S_Stop: case S_Release: case S_MovableRelease: - if (!S.RRI.KnownSafe && !SuccS.RRI.KnownSafe) + if (!S.RRI.KnownSafe && !SuccSRRIKnownSafe) AllSuccsHaveSame = false; break; case S_Retain: @@ -2464,11 +2474,21 @@ ObjCARCOpt::CheckForCFGHazards(const BasicBlock *BB, --SE; for (; SI != SE; ++SI) { - PtrState &SuccS = BBStates[*SI].getPtrBottomUpState(Arg); - switch (SuccS.GetSeq()) { + Sequence SuccSSeq = S_None; + bool SuccSRRIKnownSafe = false; + // If VisitBottomUp has visited this successor, take what we know about it. + DenseMap<const BasicBlock *, BBState>::iterator BBI = BBStates.find(*SI); + if (BBI != BBStates.end()) { + const PtrState &SuccS = BBI->second.getPtrBottomUpState(Arg); + SuccSSeq = SuccS.GetSeq(); + SuccSRRIKnownSafe = SuccS.RRI.KnownSafe; + } + switch (SuccSSeq) { case S_None: { - if (!S.RRI.KnownSafe && !SuccS.RRI.KnownSafe) + if (!S.RRI.KnownSafe && !SuccSRRIKnownSafe) { S.ClearSequenceProgress(); + break; + } continue; } case S_CanRelease: @@ -2478,7 +2498,7 @@ ObjCARCOpt::CheckForCFGHazards(const BasicBlock *BB, case S_Release: case S_MovableRelease: case S_Use: - if (!S.RRI.KnownSafe && !SuccS.RRI.KnownSafe) + if (!S.RRI.KnownSafe && !SuccSRRIKnownSafe) AllSuccsHaveSame = false; break; case S_Retain: |
