//===- DominanceFrontier.cpp - Dominance Frontier Calculation -------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License.  See LICENSE.TXT for details. 
//
//===----------------------------------------------------------------------===//

#include "llvm/Analysis/DominanceFrontier.h"
#include "llvm/Analysis/DominanceFrontierImpl.h"
#include "llvm/IR/PassManager.h"

using namespace llvm;

namespace llvm {
template class DominanceFrontierBase<BasicBlock>;
template class ForwardDominanceFrontierBase<BasicBlock>;
}

char DominanceFrontierWrapperPass::ID = 0;

INITIALIZE_PASS_BEGIN(DominanceFrontierWrapperPass, "domfrontier",
                "Dominance Frontier Construction", true, true)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
INITIALIZE_PASS_END(DominanceFrontierWrapperPass, "domfrontier",
                "Dominance Frontier Construction", true, true)

 DominanceFrontierWrapperPass::DominanceFrontierWrapperPass()
    : FunctionPass(ID), DF() {
  initializeDominanceFrontierWrapperPassPass(*PassRegistry::getPassRegistry());
}

void DominanceFrontierWrapperPass::releaseMemory() {
  DF.releaseMemory();
}

bool DominanceFrontierWrapperPass::runOnFunction(Function &) {
  releaseMemory();
  DF.analyze(getAnalysis<DominatorTreeWrapperPass>().getDomTree());
  return false;
}

void DominanceFrontierWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
  AU.setPreservesAll();
  AU.addRequired<DominatorTreeWrapperPass>();
}

void DominanceFrontierWrapperPass::print(raw_ostream &OS, const Module *) const {
  DF.print(OS);
}

#if ! defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void DominanceFrontierWrapperPass::dump() const {
  print(dbgs());
}
#endif

AnalysisKey DominanceFrontierAnalysis::Key;

DominanceFrontier DominanceFrontierAnalysis::run(Function &F,
                                                 FunctionAnalysisManager &AM) {
  DominanceFrontier DF;
  DF.analyze(AM.getResult<DominatorTreeAnalysis>(F));
  return DF;
}

DominanceFrontierPrinterPass::DominanceFrontierPrinterPass(raw_ostream &OS)
  : OS(OS) {}

PreservedAnalyses
DominanceFrontierPrinterPass::run(Function &F, FunctionAnalysisManager &AM) {
  OS << "DominanceFrontier for function: " << F.getName() << "\n";
  AM.getResult<DominanceFrontierAnalysis>(F).print(OS);

  return PreservedAnalyses::all();
}
