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Unify the destruction code used for node pairs vs normal nodes. This was
causing a problem before because global values with incoming edges didn't copy the incoming edges to the node they were being merged from, causing the poolalloc pass to die. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2079 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -22,6 +22,40 @@
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//#define DEBUG_NODE_ELIMINATE 1
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static void DestroyFirstNodeOfPair(DSNode *N1, DSNode *N2) {
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#ifdef DEBUG_NODE_ELIMINATE
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cerr << "Found Indistinguishable Node:\n";
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N1->print(cerr);
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#endif
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// The nodes can be merged. Make sure that N2 contains all of the
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// outgoing edges (fields) that N1 does...
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//
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assert(N1->getNumLinks() == N2->getNumLinks() &&
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"Same type, diff # fields?");
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for (unsigned i = 0, e = N1->getNumLinks(); i != e; ++i)
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N2->getLink(i).add(N1->getLink(i));
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// Now make sure that all of the nodes that point to N1 also point to the node
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// that we are merging it with...
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//
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const std::vector<PointerValSet*> &Refs = N1->getReferrers();
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for (unsigned i = 0, e = Refs.size(); i != e; ++i) {
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PointerValSet &PVS = *Refs[i];
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bool RanOnce = false;
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for (unsigned j = 0, je = PVS.size(); j != je; ++j)
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if (PVS[j].Node == N1) {
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RanOnce = true;
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PVS.add(PointerVal(N2, PVS[j].Index));
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}
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assert(RanOnce && "Node on user set but cannot find the use!");
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}
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N1->removeAllIncomingEdges();
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delete N1;
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}
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// isIndistinguishableNode - A node is indistinguishable if some other node
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// has exactly the same incoming links to it and if the node considers itself
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@ -84,29 +118,7 @@ static bool isIndistinguishableNode(DSNode *DN) {
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if (IndFrom == 0)
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return false; // Otherwise, nothing found, perhaps next time....
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// The nodes can be merged. Make sure that IndFrom contains all of the
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// outgoing edges (fields) that DN does...
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//
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assert(DN->getNumLinks() == IndFrom->getNumLinks() &&
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"Same type, diff # fields?");
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for (unsigned i = 0, e = DN->getNumLinks(); i != e; ++i)
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IndFrom->getLink(i).add(DN->getLink(i));
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// Now make sure that all of the nodes that point to the shadow node also
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// point to the node that we are merging it with...
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//
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for (unsigned i = 0, e = Refs.size(); i != e; ++i) {
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PointerValSet &PVS = *Refs[i];
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bool RanOnce = false;
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for (unsigned j = 0, je = PVS.size(); j != je; ++j)
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if (PVS[j].Node == DN) {
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RanOnce = true;
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PVS.add(PointerVal(IndFrom, PVS[j].Index));
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}
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assert(RanOnce && "Node on user set but cannot find the use!");
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}
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DestroyFirstNodeOfPair(DN, IndFrom);
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return true;
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}
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@ -116,12 +128,6 @@ static bool removeIndistinguishableNodes(std::vector<NodeTy*> &Nodes) {
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std::vector<NodeTy*>::iterator I = Nodes.begin();
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while (I != Nodes.end()) {
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if (isIndistinguishableNode(*I)) {
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#ifdef DEBUG_NODE_ELIMINATE
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cerr << "Found Indistinguishable Node:\n";
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(*I)->print(cerr);
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#endif
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(*I)->removeAllIncomingEdges();
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delete *I;
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I = Nodes.erase(I);
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Changed = true;
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} else {
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@ -141,12 +147,7 @@ static bool removeIndistinguishableNodePairs(std::vector<NodeTy*> &Nodes) {
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I2 != I2E; ++I2) {
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NodeTy *N2 = *I2;
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if (N1->isEquivalentTo(N2)) {
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#ifdef DEBUG_NODE_ELIMINATE
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cerr << "Found Indistinguishable Node:\n";
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N1->print(cerr);
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#endif
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N1->removeAllIncomingEdges();
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delete N1;
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DestroyFirstNodeOfPair(N1, N2);
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--I;
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I = Nodes.erase(I);
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Changed = true;
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