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Fix use_iterator crash in ObjCArc from r203364

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The use_iterator redesign in r203364 introduced an increment past the
end of a range in -objc-arc-contract.  Added an explicit check for the
end of the range.

<rdar://problem/16333235>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204195 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2014-03-18 22:32:43 +00:00
parent 6d1980d0ca
commit 9ea770ddbb
2 changed files with 33 additions and 2 deletions
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5
lib/Transforms/ObjCARC/ObjCARCContract.cpp
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@@ -475,8 +475,9 @@ bool ObjCARCContract::runOnFunction(Function &F) {
for (unsigned i = 0, e = PHI->getNumIncomingValues(); i != e; ++i)
if (PHI->getIncomingBlock(i) == BB) {
// Keep the UI iterator valid.
if (&PHI->getOperandUse(
PHINode::getOperandNumForIncomingValue(i)) == &U)
if (UI != UE &&
&PHI->getOperandUse(
PHINode::getOperandNumForIncomingValue(i)) == &*UI)
++UI;
PHI->setIncomingValue(i, Replacement);
}