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Fix iterator invalidation problem 

llvm-svn: 5895
This commit is contained in:
Chris Lattner 2003-04-24 17:52:20 +00:00
parent b57ed83e28
commit 364437e6a3
1 changed files with 7 additions and 2 deletions
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9
llvm/lib/Transforms/Utils/PromoteMemoryToRegister.cpp
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@ -201,8 +201,13 @@ bool PromoteMem2Reg::QueuePhiNode(BasicBlock *BB, unsigned AllocaNo) {
// because it is an unreachable predecessor), that all PHI nodes will have the
// correct number of entries for their predecessors.
Value *NullVal = Constant::getNullValue(PN->getType());
for (pred_iterator PI = pred_begin(BB), PE = pred_end(BB); PI != PE; ++PI)
PN->addIncoming(NullVal, *PI);
// This is neccesary because adding incoming values to the PHI node adds uses
// to the basic blocks being used, which can invalidate the predecessor
// iterator!
std::vector<BasicBlock*> Preds(pred_begin(BB), pred_end(BB));
for (unsigned i = 0, e = Preds.size(); i != e; ++i)
PN->addIncoming(NullVal, Preds[i]);
BBPNs[AllocaNo] = PN;
PhiNodes[AllocaNo].push_back(BB);