llvm-6502/include/llvm/Analysis/PostDominators.h

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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_POST_DOMINATORS_H
#define LLVM_ANALYSIS_POST_DOMINATORS_H
#include "llvm/Analysis/Dominators.h"
namespace llvm {
/// PostDominatorTree Class - Concrete subclass of DominatorTree that is used to
/// compute the a post-dominator tree.
///
struct PostDominatorTree : public FunctionPass {
static char ID; // Pass identification, replacement for typeid
DominatorTreeBase<BasicBlock>* DT;
PostDominatorTree() : FunctionPass((intptr_t)&ID) {
DT = new DominatorTreeBase<BasicBlock>(true);
}
virtual bool runOnFunction(Function &F);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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 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);
}
};
/// PostDominanceFrontier Class - Concrete subclass of DominanceFrontier that is
/// used to compute the a post-dominance frontier.
///
struct PostDominanceFrontier : public DominanceFrontierBase {
static char ID;
PostDominanceFrontier()
: DominanceFrontierBase((intptr_t) &ID, true) {}
virtual bool runOnFunction(Function &) {
Frontiers.clear();
PostDominatorTree &DT = getAnalysis<PostDominatorTree>();
Roots = DT.getRoots();
if (const DomTreeNode *Root = DT.getRootNode())
calculate(DT, Root);
return false;
}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<PostDominatorTree>();
}
private:
const DomSetType &calculate(const PostDominatorTree &DT,
const DomTreeNode *Node);
};
} // End llvm namespace
// Make sure that any clients of this file link in PostDominators.cpp
FORCE_DEFINING_FILE_TO_BE_LINKED(PostDominanceFrontier)
#endif