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//=- llvm/Analysis/PostDominators.h - Post Dominator Calculation-*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and 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 DominatorTreeBase {
static const char ID; // Pass identifcation, replacement for typeid
PostDominatorTree() :
DominatorTreeBase((intptr_t)&ID, true) {}
virtual bool runOnFunction(Function &F) {
reset(); // Reset from the last time we were run...
calculate(F);
return false;
}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
private:
void calculate(Function &F);
Node *getNodeForBlock(BasicBlock *BB);
unsigned DFSPass(BasicBlock *V, InfoRec &VInfo,unsigned N);
void Compress(BasicBlock *V, InfoRec &VInfo);
BasicBlock *Eval(BasicBlock *V);
void Link(BasicBlock *V, BasicBlock *W, InfoRec &WInfo);
inline BasicBlock *getIDom(BasicBlock *BB) const {
std::map<BasicBlock*, BasicBlock*>::const_iterator I = IDoms.find(BB);
return I != IDoms.end() ? I->second : 0;
}
};
/// PostETForest Class - Concrete subclass of ETForestBase that is used to
/// compute a forwards post-dominator ET-Forest.
struct PostETForest : public ETForestBase {
static const char ID;
PostETForest() : ETForestBase((intptr_t)&ID, true) {}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<PostDominatorTree>();
}
virtual bool runOnFunction(Function &F) {
reset(); // Reset from the last time we were run...
PostDominatorTree &DT = getAnalysis<PostDominatorTree>();
Roots = DT.getRoots();
calculate(DT);
return false;
}
void calculate(const PostDominatorTree &DT);
ETNode *getNodeForBlock(BasicBlock *BB);
};
/// PostDominanceFrontier Class - Concrete subclass of DominanceFrontier that is
/// used to compute the a post-dominance frontier.
///
struct PostDominanceFrontier : public DominanceFrontierBase {
static const char ID;
PostDominanceFrontier()
: DominanceFrontierBase((intptr_t) &ID, true) {}
virtual bool runOnFunction(Function &) {
Frontiers.clear();
PostDominatorTree &DT = getAnalysis<PostDominatorTree>();
Roots = DT.getRoots();
if (const DominatorTree::Node *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 DominatorTree::Node *Node);
};
} // End llvm namespace
// Make sure that any clients of this file link in PostDominators.cpp
FORCE_DEFINING_FILE_TO_BE_LINKED(PostDominanceFrontier)
#endif
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