//===-- MachineFunctionPrinterPass.cpp ------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// MachineFunctionPrinterPass implementation.
//
//===----------------------------------------------------------------------===//

#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/SlotIndexes.h"
#include "llvm/IR/PrintPasses.h"
#include "llvm/InitializePasses.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"

using namespace llvm;

namespace {
bool shouldPrintMachineFunction(const MachineFunction &MF) {
  bool SourceLocFilterEmpty = isSourceLocFilterEmpty();
  if (!isFunctionInPrintList(MF.getName()))
    return false;

  if (SourceLocFilterEmpty)
    return true;

  for (const MachineBasicBlock &MBB : MF)
    for (const MachineInstr &MI : MBB)
      if (isSourceLocInPrintList(MI.getDebugLoc()))
        return true;
  return false;
}

/// MachineFunctionPrinterPass - This is a pass to dump the IR of a
/// MachineFunction.
///
struct MachineFunctionPrinterPass : public MachineFunctionPass {
  static char ID;

  raw_ostream &OS;
  const std::string Banner;

  MachineFunctionPrinterPass() : MachineFunctionPass(ID), OS(dbgs()) { }
  MachineFunctionPrinterPass(raw_ostream &os, const std::string &banner)
      : MachineFunctionPass(ID), OS(os), Banner(banner) {}

  StringRef getPassName() const override { return "MachineFunction Printer"; }

  void getAnalysisUsage(AnalysisUsage &AU) const override {
    AU.setPreservesAll();
    AU.addUsedIfAvailable<SlotIndexesWrapperPass>();
    MachineFunctionPass::getAnalysisUsage(AU);
  }

  bool runOnMachineFunction(MachineFunction &MF) override {
    if (!shouldPrintMachineFunction(MF))
      return false;
    OS << "# " << Banner << ":\n";
    auto *SIWrapper = getAnalysisIfAvailable<SlotIndexesWrapperPass>();
    MF.print(OS, SIWrapper ? &SIWrapper->getSI() : nullptr);
    return false;
  }
};

char MachineFunctionPrinterPass::ID = 0;
}

char &llvm::MachineFunctionPrinterPassID = MachineFunctionPrinterPass::ID;
INITIALIZE_PASS(MachineFunctionPrinterPass, "machineinstr-printer",
                "Machine Function Printer", false, false)

/// Returns a newly-created MachineFunction Printer pass. The
/// default banner is empty.
///
MachineFunctionPass *
llvm::createMachineFunctionPrinterPass(raw_ostream &OS,
                                       const std::string &Banner) {
  return new MachineFunctionPrinterPass(OS, Banner);
}