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Fix an incredibly nasty iterator invalidation problem. I am too spoiled by ilists :)
Eventually it would be nice if CallGraph maintained an ilist of CallGraphNode's instead of a vector of pointers to them, but today is not that day. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13100 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -105,14 +105,6 @@ bool Inliner::runOnSCC(const std::vector<CallGraphNode*> &SCC) {
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for (CallGraphNode::iterator I = CalleeNode->begin(),
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E = CalleeNode->end(); I != E; ++I)
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CallerNode->addCalledFunction(*I);
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// If the only remaining use of the function is a dead constant
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// pointer ref, remove it.
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if (Callee->hasOneUse())
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if (ConstantPointerRef *CPR =
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dyn_cast<ConstantPointerRef>(Callee->use_back()))
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if (CPR->use_empty())
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CPR->destroyConstant();
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// If we inlined the last possible call site to the function,
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// delete the function body now.
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@ -142,27 +134,55 @@ bool Inliner::runOnSCC(const std::vector<CallGraphNode*> &SCC) {
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// doFinalization - Remove now-dead linkonce functions at the end of
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// processing to avoid breaking the SCC traversal.
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bool Inliner::doFinalization(CallGraph &CG) {
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bool Changed = false;
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for (CallGraph::iterator I = CG.begin(), E = CG.end(); I != E; ) {
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CallGraphNode *CGN = (I++)->second;
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std::set<CallGraphNode*> FunctionsToRemove;
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// Scan for all of the functions, looking for ones that should now be removed
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// from the program. Insert the dead ones in the FunctionsToRemove set.
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for (CallGraph::iterator I = CG.begin(), E = CG.end(); I != E; ++I) {
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CallGraphNode *CGN = I->second;
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Function *F = CGN ? CGN->getFunction() : 0;
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// If the only remaining use of the function is a dead constant
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// pointer ref, remove it.
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if (F && F->hasOneUse())
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if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(F->use_back()))
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if (CPR->use_empty()) {
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CPR->destroyConstant();
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if (F->hasInternalLinkage()) {
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// There *MAY* be an edge from the external call node to this
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// function. If so, remove it.
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CallGraphNode *EN = CG.getExternalCallingNode();
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CallGraphNode::iterator I = std::find(EN->begin(), EN->end(), CGN);
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if (I != EN->end()) EN->removeCallEdgeTo(CGN);
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}
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}
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if (F && (F->hasLinkOnceLinkage() || F->hasInternalLinkage()) &&
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F->use_empty()) {
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// Remove any call graph edges from the callee to its callees.
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// Remove any call graph edges from the function to its callees.
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while (CGN->begin() != CGN->end())
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CGN->removeCallEdgeTo(*(CGN->end()-1));
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// If the function has external linkage (basically if it's a
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// linkonce function) remove the edge from the external node to the
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// callee node.
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// If the function has external linkage (basically if it's a linkonce
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// function) remove the edge from the external node to the callee node.
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if (!F->hasInternalLinkage())
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CG.getExternalCallingNode()->removeCallEdgeTo(CGN);
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// Removing the node for callee from the call graph and delete it.
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delete CG.removeFunctionFromModule(CGN);
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++NumDeleted;
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Changed = true;
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FunctionsToRemove.insert(CGN);
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}
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}
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// Now that we know which functions to delete, do so. We didn't want to do
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// this inline, because that would invalidate our CallGraph::iterator
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// objects. :(
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bool Changed = false;
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for (std::set<CallGraphNode*>::iterator I = FunctionsToRemove.begin(),
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E = FunctionsToRemove.end(); I != E; ++I) {
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delete CG.removeFunctionFromModule(*I);
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++NumDeleted;
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Changed = true;
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}
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return Changed;
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}
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