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fix a crash building SPASS by tolerating a callsite that doesn't exist

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in the callgraph, see the big comment at the top of the testcase.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80541 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-08-31 05:46:59 +00:00
parent d43d5e832f
commit 46ca76f6bb
2 changed files with 70 additions and 8 deletions
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21
lib/Analysis/IPA/CallGraph.cpp
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@ -239,14 +239,19 @@ void CallGraphNode::dump() const { print(errs()); }
/// specified call site. Note that this method takes linear time, so it
/// should be used sparingly.
void CallGraphNode::removeCallEdgeFor(CallSite CS) {
for (CalledFunctionsVector::iterator I = CalledFunctions.begin(); ; ++I) {
assert(I != CalledFunctions.end() && "Cannot find callsite to remove!");
if (I->first == CS) {
I->second->DropRef();
*I = CalledFunctions.back();
CalledFunctions.pop_back();
return;
}
// Scan for the call site. Note that we aren't guaranteed to find the call
// site in this node, even in reasonable situations. Passes like instcombine
// can adjust callsites (e.g. folding bitcasts into calls to make them direct)
// which can introduce new call sites. Since instcombine is not callgraph
// aware, it doesn't know to tell CallGraph about this change.
for (CalledFunctionsVector::iterator I = CalledFunctions.begin();
I != CalledFunctions.end(); ++I) {
if (I->first != CS) continue;
I->second->DropRef();
*I = CalledFunctions.back();
CalledFunctions.pop_back();
return;
}
}