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Do not manipulate invalid iterators. This fixes the

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llvm-gcc build when expensive checking is turned on.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80671 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands 2009-09-01 15:13:02 +00:00
parent 72f9ab030e
commit c142bb294b
1 changed files with 11 additions and 6 deletions
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17
lib/Analysis/IPA/CallGraphSCCPass.cpp
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@ -143,11 +143,16 @@ void CGPassManager::RefreshCallGraph(std::vector<CallGraphNode*> &CurSCC,
// Walk the function body looking for call sites. Sync up the call sites in
// CGN with those actually in the function.
// Get the set of call sites currently in the function.
for (CallGraphNode::iterator I = CGN->begin(), E = CGN->end(); I != E; ++I){
bool isLast = CGN->empty();
for (CallGraphNode::iterator I = CGN->begin(), E = CGN->end(), N; !isLast;){
// Take care not to use singular iterators.
N = I + 1;
isLast = N == E;
// If this call site is null, then the function pass deleted the call
// entirely and the WeakVH nulled it out.
// entirely and the WeakVH nulled it out.
if (I->first == 0 ||
// If we've already seen this call site, then the FunctionPass RAUW'd
// one call with another, which resulted in two "uses" in the edge
@ -161,15 +166,15 @@ void CGPassManager::RefreshCallGraph(std::vector<CallGraphNode*> &CurSCC,
// Just remove the edge from the set of callees.
CGN->removeCallEdge(I);
E = CGN->end();
--I;
continue;
}
assert(!CallSites.count(I->first) &&
"Call site occurs in node multiple times");
CallSites.insert(std::make_pair(I->first, I->second));
I = N;
}
// Loop over all of the instructions in the function, getting the callsites.
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) {