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Avoid recursion in assignDFSNumber(). Move def from ET-Forest.h
to Dominators.h git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30309 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -250,16 +250,7 @@ public:
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return this->Below(other);
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}
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void assignDFSNumber(int &num) {
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DFSNumIn = num++;
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if (Son) {
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Son->assignDFSNumber(num);
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for (ETNode *son = Son->Right; son != Son; son = son->Right)
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son->assignDFSNumber(num);
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}
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DFSNumOut = num++;
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}
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void assignDFSNumber(int &);
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bool hasFather() const {
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return Father != NULL;
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@ -890,6 +890,39 @@ void ETForest::calculate(const ImmediateDominators &ID) {
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updateDFSNumbers ();
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}
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// Walk ETNode and its children using DFS algorithm and assign
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// DFSNumIn and DFSNumOut numbers for each node.
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void ETNode::assignDFSNumber(int &num) {
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std::vector<ETNode *> DFSInStack;
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std::set<ETNode *> visited;
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DFSInStack.push_back(this);
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visited.insert(this);
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while(!DFSInStack.empty()) {
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ETNode *Parent = DFSInStack.back();
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DFSInStack.pop_back();
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Parent->DFSNumIn = num++;
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Parent->DFSNumOut = Parent->DFSNumIn + 1;
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ETNode *son = Parent->Son;
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if (son && visited.count(son) == 0) {
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DFSInStack.push_back(son);
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son->DFSNumIn = Parent->DFSNumIn + 1;
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visited.insert(son);
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for (ETNode *s = son->Right; s != son; s = s->Right) {
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DFSInStack.push_back(s);
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s->DFSNumIn = Parent->DFSNumIn + 1;
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visited.insert(s);
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}
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}
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}
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}
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//===----------------------------------------------------------------------===//
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// ETForestBase Implementation
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//===----------------------------------------------------------------------===//
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