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135 lines
3.5 KiB
C++
135 lines
3.5 KiB
C++
//=- llvm/Analysis/PostDominators.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 is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file exposes interfaces to post dominance information.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_POST_DOMINATORS_H
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#define LLVM_ANALYSIS_POST_DOMINATORS_H
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#include "llvm/Analysis/Dominators.h"
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namespace llvm {
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/// PostDominatorTree Class - Concrete subclass of DominatorTree that is used to
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/// compute the a post-dominator tree.
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///
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struct PostDominatorTree : public FunctionPass {
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static char ID; // Pass identification, replacement for typeid
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DominatorTreeBase<BasicBlock>* DT;
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PostDominatorTree() : FunctionPass(ID) {
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DT = new DominatorTreeBase<BasicBlock>(true);
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}
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~PostDominatorTree();
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virtual bool runOnFunction(Function &F);
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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inline const std::vector<BasicBlock*> &getRoots() const {
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return DT->getRoots();
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}
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inline DomTreeNode *getRootNode() const {
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return DT->getRootNode();
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}
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inline DomTreeNode *operator[](BasicBlock *BB) const {
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return DT->getNode(BB);
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}
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inline DomTreeNode *getNode(BasicBlock *BB) const {
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return DT->getNode(BB);
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}
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inline bool dominates(DomTreeNode* A, DomTreeNode* B) const {
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return DT->dominates(A, B);
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}
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inline bool dominates(const BasicBlock* A, const BasicBlock* B) const {
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return DT->dominates(A, B);
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}
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inline bool properlyDominates(const DomTreeNode* A, DomTreeNode* B) const {
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return DT->properlyDominates(A, B);
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}
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inline bool properlyDominates(BasicBlock* A, BasicBlock* B) const {
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return DT->properlyDominates(A, B);
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}
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inline BasicBlock *findNearestCommonDominator(BasicBlock *A, BasicBlock *B) {
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return DT->findNearestCommonDominator(A, B);
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}
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virtual void releaseMemory() {
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DT->releaseMemory();
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}
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virtual void print(raw_ostream &OS, const Module*) const;
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};
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FunctionPass* createPostDomTree();
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template <> struct GraphTraits<PostDominatorTree*>
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: public GraphTraits<DomTreeNode*> {
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static NodeType *getEntryNode(PostDominatorTree *DT) {
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return DT->getRootNode();
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}
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static nodes_iterator nodes_begin(PostDominatorTree *N) {
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if (getEntryNode(N))
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return df_begin(getEntryNode(N));
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else
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return df_end(getEntryNode(N));
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}
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static nodes_iterator nodes_end(PostDominatorTree *N) {
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return df_end(getEntryNode(N));
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}
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};
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/// PostDominanceFrontier Class - Concrete subclass of DominanceFrontier that is
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/// used to compute the a post-dominance frontier.
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///
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struct PostDominanceFrontier : public DominanceFrontierBase {
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static char ID;
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PostDominanceFrontier()
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: DominanceFrontierBase(ID, true) {}
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virtual bool runOnFunction(Function &) {
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Frontiers.clear();
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PostDominatorTree &DT = getAnalysis<PostDominatorTree>();
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Roots = DT.getRoots();
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if (const DomTreeNode *Root = DT.getRootNode())
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calculate(DT, Root);
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return false;
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired<PostDominatorTree>();
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}
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private:
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const DomSetType &calculate(const PostDominatorTree &DT,
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const DomTreeNode *Node);
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};
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FunctionPass* createPostDomFrontier();
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} // End llvm namespace
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#endif
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