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building on the new CallGraphSCC abstraction, teach CallGraphSCCPassManager

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to keep the node entries in scc_iterator up to date instead of dangling as
the SCC mutates.

This is a really terrible problem which was causing -g to affect codegen 
because it would permute the memory image of the compiler process.

Thanks to Dale for expertly hunting it down.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101565 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-04-16 23:04:30 +00:00
parent 53c5e42ab9
commit bde0bb5f88
2 changed files with 14 additions and 0 deletions
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5
lib/Analysis/IPA/CallGraphSCCPass.cpp
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@ -417,6 +417,11 @@ void CallGraphSCC::ReplaceNode(CallGraphNode *Old, CallGraphNode *New) {
Nodes[i] = New;
break;
}
// Update the active scc_iterator so that it doesn't contain dangling
// pointers to the old CallGraphNode.
scc_iterator<CallGraph*> *CGI = (scc_iterator<CallGraph*>*)Context;
CGI->ReplaceNode(Old, New);
}