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Completely merge the implementation details of DomTree and PostDomTree.
Also, add a FIXME for a bug in PostDomTree calculation I noticed while writing this, git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42593 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -208,6 +208,93 @@ void Link(DominatorTreeBase& DT, typename GraphT::NodeType* V,
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#endif
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}
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template<class NodeT>
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void Calculate(DominatorTreeBase& DT, Function& F) {
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// Step #1: Number blocks in depth-first order and initialize variables used
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// in later stages of the algorithm.
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unsigned N = 0;
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for (unsigned i = 0, e = DT.Roots.size(); i != e; ++i)
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N = DFSPass<GraphTraits<NodeT> >(DT, DT.Roots[i], N);
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for (unsigned i = N; i >= 2; --i) {
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typename GraphTraits<NodeT>::NodeType* W = DT.Vertex[i];
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DominatorTree::InfoRec &WInfo = DT.Info[W];
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// Step #2: Calculate the semidominators of all vertices
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for (typename GraphTraits<Inverse<NodeT> >::ChildIteratorType CI =
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GraphTraits<Inverse<NodeT> >::child_begin(W),
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E = GraphTraits<Inverse<NodeT> >::child_end(W); CI != E; ++CI)
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if (DT.Info.count(*CI)) { // Only if this predecessor is reachable!
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unsigned SemiU = DT.Info[Eval<GraphTraits<NodeT> >(DT, *CI)].Semi;
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if (SemiU < WInfo.Semi)
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WInfo.Semi = SemiU;
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}
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DT.Info[DT.Vertex[WInfo.Semi]].Bucket.push_back(W);
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typename GraphTraits<NodeT>::NodeType* WParent = WInfo.Parent;
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Link<GraphTraits<NodeT> >(DT, WParent, W, WInfo);
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// Step #3: Implicitly define the immediate dominator of vertices
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std::vector<typename GraphTraits<NodeT>::NodeType*> &WParentBucket =
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DT.Info[WParent].Bucket;
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while (!WParentBucket.empty()) {
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typename GraphTraits<NodeT>::NodeType* V = WParentBucket.back();
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WParentBucket.pop_back();
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typename GraphTraits<NodeT>::NodeType* U =
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Eval<GraphTraits<NodeT> >(DT, V);
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DT.IDoms[V] = DT.Info[U].Semi < DT.Info[V].Semi ? U : WParent;
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}
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}
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// Step #4: Explicitly define the immediate dominator of each vertex
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for (unsigned i = 2; i <= N; ++i) {
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typename GraphTraits<NodeT>::NodeType* W = DT.Vertex[i];
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typename GraphTraits<NodeT>::NodeType*& WIDom = DT.IDoms[W];
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if (WIDom != DT.Vertex[DT.Info[W].Semi])
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WIDom = DT.IDoms[WIDom];
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}
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if (DT.Roots.empty()) return;
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// Add a node for the root. This node might be the actual root, if there is
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// one exit block, or it may be the virtual exit (denoted by (BasicBlock *)0)
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// which postdominates all real exits if there are multiple exit blocks.
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typename GraphTraits<NodeT>::NodeType* Root = DT.Roots.size() == 1 ? DT.Roots[0]
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: 0;
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DT.DomTreeNodes[Root] = DT.RootNode = new DomTreeNode(Root, 0);
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// Loop over all of the reachable blocks in the function...
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for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I)
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if (typename GraphTraits<NodeT>::NodeType* ImmDom = DT.getIDom(I)) {
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// Reachable block.
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DomTreeNode *BBNode = DT.DomTreeNodes[I];
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if (BBNode) continue; // Haven't calculated this node yet?
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// Get or calculate the node for the immediate dominator
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DomTreeNode *IDomNode = DT.getNodeForBlock(ImmDom);
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// Add a new tree node for this BasicBlock, and link it as a child of
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// IDomNode
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DomTreeNode *C = new DomTreeNode(I, IDomNode);
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DT.DomTreeNodes[I] = IDomNode->addChild(C);
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}
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// Free temporary memory used to construct idom's
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DT.IDoms.clear();
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DT.Info.clear();
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std::vector<typename GraphTraits<NodeT>::NodeType*>().swap(DT.Vertex);
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// FIXME: This does not work on PostDomTrees. It seems likely that this is
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// due to an error in the algorithm for post-dominators. This really should
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// be investigated and fixed at some point.
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// DT.updateDFSNumbers();
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// Start out with the DFS numbers being invalid. Let them be computed if
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// demanded.
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DT.DFSInfoValid = false;
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}
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}
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#endif
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@ -289,6 +289,9 @@ protected:
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typename GraphT::NodeType* V,
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unsigned N);
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template<class NodeT> friend void Calculate(DominatorTreeBase& DT,
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Function& F);
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/// updateDFSNumbers - Assign In and Out numbers to the nodes while walking
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/// dominator tree in dfs order.
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void updateDFSNumbers();
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@ -325,9 +328,6 @@ public:
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/// BB is split and now it has one successor. Update dominator tree to
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/// reflect this change.
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void splitBlock(BasicBlock *BB);
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private:
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friend void DTcalculate(DominatorTree& DT, Function& F);
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};
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//===-------------------------------------
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@ -32,8 +32,6 @@ struct PostDominatorTree : public DominatorTreeBase {
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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private:
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friend void PDTcalculate(PostDominatorTree& PDT, Function &F);
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};
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@ -1,99 +0,0 @@
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//==- PostDominatorCalculation.h - Post-Dominator Calculation ----*- C++ -*-==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Owen Anderson and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// PostDominatorTree calculation implementation.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_POST_DOMINATOR_CALCULATION_H
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#define LLVM_ANALYSIS_POST_DOMINATOR_CALCULATION_H
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#include "llvm/Analysis/PostDominators.h"
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#include "llvm/Analysis/DominatorInternals.h"
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namespace llvm {
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void PDTcalculate(PostDominatorTree& PDT, Function &F) {
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// Step #1: Number blocks in depth-first order and initialize variables used
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// in later stages of the algorithm.
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unsigned N = 0;
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for (unsigned i = 0, e = PDT.Roots.size(); i != e; ++i)
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N = DFSPass<GraphTraits<Inverse<BasicBlock*> > >(PDT, PDT.Roots[i], N);
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for (unsigned i = N; i >= 2; --i) {
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BasicBlock *W = PDT.Vertex[i];
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PostDominatorTree::InfoRec &WInfo = PDT.Info[W];
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// Step #2: Calculate the semidominators of all vertices
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for (succ_iterator SI = succ_begin(W), SE = succ_end(W); SI != SE; ++SI)
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if (PDT.Info.count(*SI)) { // Only if this predecessor is reachable!
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unsigned SemiU =
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PDT.Info[Eval<GraphTraits<Inverse<BasicBlock*> > >(PDT, *SI)].Semi;
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if (SemiU < WInfo.Semi)
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WInfo.Semi = SemiU;
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}
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PDT.Info[PDT.Vertex[WInfo.Semi]].Bucket.push_back(W);
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BasicBlock *WParent = WInfo.Parent;
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Link<GraphTraits<Inverse<BasicBlock*> > >(PDT, WParent, W, WInfo);
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// Step #3: Implicitly define the immediate dominator of vertices
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std::vector<BasicBlock*> &WParentBucket = PDT.Info[WParent].Bucket;
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while (!WParentBucket.empty()) {
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BasicBlock *V = WParentBucket.back();
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WParentBucket.pop_back();
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BasicBlock *U = Eval<GraphTraits<Inverse<BasicBlock*> > >(PDT, V);
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PDT.IDoms[V] = PDT.Info[U].Semi < PDT.Info[V].Semi ? U : WParent;
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}
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}
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// Step #4: Explicitly define the immediate dominator of each vertex
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for (unsigned i = 2; i <= N; ++i) {
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BasicBlock *W = PDT.Vertex[i];
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BasicBlock *&WIDom = PDT.IDoms[W];
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if (WIDom != PDT.Vertex[PDT.Info[W].Semi])
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WIDom = PDT.IDoms[WIDom];
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}
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if (PDT.Roots.empty()) return;
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// Add a node for the root. This node might be the actual root, if there is
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// one exit block, or it may be the virtual exit (denoted by (BasicBlock *)0)
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// which postdominates all real exits if there are multiple exit blocks.
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BasicBlock *Root = PDT.Roots.size() == 1 ? PDT.Roots[0] : 0;
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PDT.DomTreeNodes[Root] = PDT.RootNode = new DomTreeNode(Root, 0);
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// Loop over all of the reachable blocks in the function...
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for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I)
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if (BasicBlock *ImmPostDom = PDT.getIDom(I)) { // Reachable block.
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DomTreeNode *&BBNode = PDT.DomTreeNodes[I];
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if (!BBNode) { // Haven't calculated this node yet?
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// Get or calculate the node for the immediate dominator
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DomTreeNode *IPDomNode = PDT.getNodeForBlock(ImmPostDom);
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// Add a new tree node for this BasicBlock, and link it as a child of
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// IDomNode
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DomTreeNode *C = new DomTreeNode(I, IPDomNode);
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PDT.DomTreeNodes[I] = C;
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BBNode = IPDomNode->addChild(C);
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}
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}
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// Free temporary memory used to construct idom's
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PDT.IDoms.clear();
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PDT.Info.clear();
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std::vector<BasicBlock*>().swap(PDT.Vertex);
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// Start out with the DFS numbers being invalid. Let them be computed if
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// demanded.
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PDT.DFSInfoValid = false;
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}
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}
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#endif
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@ -16,7 +16,7 @@
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#include "llvm/Support/CFG.h"
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#include "llvm/ADT/DepthFirstIterator.h"
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#include "llvm/ADT/SetOperations.h"
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#include "PostDominatorCalculation.h"
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#include "llvm/Analysis/DominatorInternals.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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@ -47,7 +47,7 @@ bool PostDominatorTree::runOnFunction(Function &F) {
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Vertex.push_back(0);
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PDTcalculate(*this, F);
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Calculate<Inverse<BasicBlock*> >(*this, F);
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return false;
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}
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@ -1,106 +0,0 @@
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//==- DominatorCalculation.h - Dominator Calculation -------------*- C++ -*-==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Owen Anderson and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_VMCORE_DOMINATOR_CALCULATION_H
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#define LLVM_VMCORE_DOMINATOR_CALCULATION_H
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#include "llvm/Analysis/Dominators.h"
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#include "llvm/Analysis/DominatorInternals.h"
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//===----------------------------------------------------------------------===//
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//
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// DominatorTree construction - This pass constructs immediate dominator
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// information for a flow-graph based on the algorithm described in this
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// document:
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//
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// A Fast Algorithm for Finding Dominators in a Flowgraph
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// T. Lengauer & R. Tarjan, ACM TOPLAS July 1979, pgs 121-141.
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//
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// This implements both the O(n*ack(n)) and the O(n*log(n)) versions of EVAL and
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// LINK, but it turns out that the theoretically slower O(n*log(n))
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// implementation is actually faster than the "efficient" algorithm (even for
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// large CFGs) because the constant overheads are substantially smaller. The
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// lower-complexity version can be enabled with the following #define:
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//
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#define BALANCE_IDOM_TREE 0
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//
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//===----------------------------------------------------------------------===//
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namespace llvm {
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void DTcalculate(DominatorTree& DT, Function &F) {
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BasicBlock* Root = DT.Roots[0];
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// Add a node for the root...
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DT.DomTreeNodes[Root] = DT.RootNode = new DomTreeNode(Root, 0);
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// Step #1: Number blocks in depth-first order and initialize variables used
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// in later stages of the algorithm.
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unsigned N = DFSPass<GraphTraits<BasicBlock*> >(DT, Root, 0);
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for (unsigned i = N; i >= 2; --i) {
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BasicBlock *W = DT.Vertex[i];
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DominatorTree::InfoRec &WInfo = DT.Info[W];
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// Step #2: Calculate the semidominators of all vertices
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for (pred_iterator PI = pred_begin(W), E = pred_end(W); PI != E; ++PI)
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if (DT.Info.count(*PI)) { // Only if this predecessor is reachable!
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unsigned SemiU = DT.Info[Eval<GraphTraits<BasicBlock*> >(DT, *PI)].Semi;
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if (SemiU < WInfo.Semi)
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WInfo.Semi = SemiU;
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}
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DT.Info[DT.Vertex[WInfo.Semi]].Bucket.push_back(W);
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BasicBlock *WParent = WInfo.Parent;
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Link<GraphTraits<BasicBlock*> >(DT, WParent, W, WInfo);
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// Step #3: Implicitly define the immediate dominator of vertices
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std::vector<BasicBlock*> &WParentBucket = DT.Info[WParent].Bucket;
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while (!WParentBucket.empty()) {
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BasicBlock *V = WParentBucket.back();
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WParentBucket.pop_back();
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BasicBlock *U = Eval<GraphTraits<BasicBlock*> >(DT, V);
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DT.IDoms[V] = DT.Info[U].Semi < DT.Info[V].Semi ? U : WParent;
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}
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}
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// Step #4: Explicitly define the immediate dominator of each vertex
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for (unsigned i = 2; i <= N; ++i) {
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BasicBlock *W = DT.Vertex[i];
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BasicBlock *&WIDom = DT.IDoms[W];
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if (WIDom != DT.Vertex[DT.Info[W].Semi])
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WIDom = DT.IDoms[WIDom];
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}
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// Loop over all of the reachable blocks in the function...
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for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I)
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if (BasicBlock *ImmDom = DT.getIDom(I)) { // Reachable block.
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DomTreeNode *BBNode = DT.DomTreeNodes[I];
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if (BBNode) continue; // Haven't calculated this node yet?
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// Get or calculate the node for the immediate dominator
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DomTreeNode *IDomNode = DT.getNodeForBlock(ImmDom);
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// Add a new tree node for this BasicBlock, and link it as a child of
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// IDomNode
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DomTreeNode *C = new DomTreeNode(I, IDomNode);
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DT.DomTreeNodes[I] = IDomNode->addChild(C);
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}
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// Free temporary memory used to construct idom's
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DT.Info.clear();
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DT.IDoms.clear();
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std::vector<BasicBlock*>().swap(DT.Vertex);
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DT.updateDFSNumbers();
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}
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}
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#endif
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@ -21,9 +21,9 @@
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#include "llvm/ADT/SetOperations.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Analysis/DominatorInternals.h"
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#include "llvm/Instructions.h"
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#include "llvm/Support/Streams.h"
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#include "DominatorCalculation.h"
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#include <algorithm>
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using namespace llvm;
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@ -357,7 +357,10 @@ bool DominatorTree::runOnFunction(Function &F) {
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DomTreeNodes[&F.getEntryBlock()] = 0;
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Vertex.push_back(0);
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DTcalculate(*this, F);
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Calculate<BasicBlock*>(*this, F);
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updateDFSNumbers();
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return false;
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}
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