//===- CycleAnalysis.cpp - Compute CycleInfo for LLVM IR ------------------===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

#include "llvm/Analysis/CycleAnalysis.h"

#include "llvm/ADT/GenericCycleImpl.h"

#include "llvm/IR/CFG.h" // for successors found by ADL in GenericCycleImpl.h

#include "llvm/InitializePasses.h"

using namespace llvm;

namespace llvm {

class Module;

}

CycleInfo CycleAnalysis::run(Function &F, FunctionAnalysisManager &) {

  CycleInfo CI;

  CI.compute(F);

  return CI;

}

AnalysisKey CycleAnalysis::Key;

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

PreservedAnalyses CycleInfoPrinterPass::run(Function &F,

                                            FunctionAnalysisManager &AM) {

  OS << "CycleInfo for function: " << F.getName() << "\n";

  AM.getResult<CycleAnalysis>(F).print(OS);

  return PreservedAnalyses::all();

}

//===----------------------------------------------------------------------===//

//  CycleInfoWrapperPass Implementation

//===----------------------------------------------------------------------===//

//

// The implementation details of the wrapper pass that holds a CycleInfo

// suitable for use with the legacy pass manager.

//

//===----------------------------------------------------------------------===//

char CycleInfoWrapperPass::ID = 0;

CycleInfoWrapperPass::CycleInfoWrapperPass() : FunctionPass(ID) {

  initializeCycleInfoWrapperPassPass(*PassRegistry::getPassRegistry());

}

INITIALIZE_PASS_BEGIN(CycleInfoWrapperPass, "cycles", "Cycle Info Analysis",

                      true, true)

INITIALIZE_PASS_END(CycleInfoWrapperPass, "cycles", "Cycle Info Analysis", true,

                    true)

void CycleInfoWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {

  AU.setPreservesAll();

}

bool CycleInfoWrapperPass::runOnFunction(Function &Func) {

  CI.clear();

  F = &Func;

  CI.compute(Func);

  return false;

}

void CycleInfoWrapperPass::print(raw_ostream &OS, const Module *) const {

  OS << "CycleInfo for function: " << F->getName() << "\n";

  CI.print(OS);

}

void CycleInfoWrapperPass::releaseMemory() {

  CI.clear();

  F = nullptr;

}