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//=- llvm/Analysis/PostDominators.h - Post Dominator Calculation-*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file exposes interfaces to post dominance information.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_POSTDOMINATORS_H
#define LLVM_ANALYSIS_POSTDOMINATORS_H
#include "llvm/IR/Dominators.h"
namespace llvm {
/// PostDominatorTree Class - Concrete subclass of DominatorTree that is used to
/// compute the post-dominator tree.
///
struct PostDominatorTree : public FunctionPass {
static char ID; // Pass identification, replacement for typeid
DominatorTreeBase<BasicBlock>* DT;
PostDominatorTree() : FunctionPass(ID) {
initializePostDominatorTreePass(*PassRegistry::getPassRegistry());
DT = new DominatorTreeBase<BasicBlock>(true);
}
~PostDominatorTree() override;
bool runOnFunction(Function &F) override;
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesAll();
}
inline const std::vector<BasicBlock*> &getRoots() const {
return DT->getRoots();
}
inline DomTreeNode *getRootNode() const {
return DT->getRootNode();
}
inline DomTreeNode *operator[](BasicBlock *BB) const {
return DT->getNode(BB);
}
inline DomTreeNode *getNode(BasicBlock *BB) const {
return DT->getNode(BB);
}
inline bool dominates(DomTreeNode* A, DomTreeNode* B) const {
return DT->dominates(A, B);
}
inline bool dominates(const BasicBlock* A, const BasicBlock* B) const {
return DT->dominates(A, B);
}
inline bool properlyDominates(const DomTreeNode* A, DomTreeNode* B) const {
return DT->properlyDominates(A, B);
}
inline bool properlyDominates(BasicBlock* A, BasicBlock* B) const {
return DT->properlyDominates(A, B);
}
inline BasicBlock *findNearestCommonDominator(BasicBlock *A, BasicBlock *B) {
return DT->findNearestCommonDominator(A, B);
}
inline const BasicBlock *findNearestCommonDominator(const BasicBlock *A,
const BasicBlock *B) {
return DT->findNearestCommonDominator(A, B);
}
/// Get all nodes post-dominated by R, including R itself.
void getDescendants(BasicBlock *R,
SmallVectorImpl<BasicBlock *> &Result) const {
DT->getDescendants(R, Result);
}
void releaseMemory() override {
DT->releaseMemory();
}
void print(raw_ostream &OS, const Module*) const override;
};
FunctionPass* createPostDomTree();
template <> struct GraphTraits<PostDominatorTree*>
: public GraphTraits<DomTreeNode*> {
static NodeType *getEntryNode(PostDominatorTree *DT) {
return DT->getRootNode();
}
static nodes_iterator nodes_begin(PostDominatorTree *N) {
if (getEntryNode(N))
return df_begin(getEntryNode(N));
else
return df_end(getEntryNode(N));
}
static nodes_iterator nodes_end(PostDominatorTree *N) {
return df_end(getEntryNode(N));
}
};
} // End llvm namespace
#endif
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