//===-- M68kCallLowering.h - Call lowering ----------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
/// \file
/// This file implements the lowering of LLVM calls to machine code calls for
/// GlobalISel.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_TARGET_M68K_GLSEL_M68KCALLLOWERING_H
#define LLVM_LIB_TARGET_M68K_GLSEL_M68KCALLLOWERING_H

#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/GlobalISel/CallLowering.h"
#include "llvm/CodeGen/ValueTypes.h"

namespace llvm {

class M68kTargetLowering;
class MachineInstrBuilder;

class M68kCallLowering : public CallLowering {
  // TODO: We are only supporting return instruction with no value at this time
  // point

public:
  M68kCallLowering(const M68kTargetLowering &TLI);

  bool lowerReturn(MachineIRBuilder &MIRBuilder, const Value *Val,
                   ArrayRef<Register> VRegs, FunctionLoweringInfo &FLI,
                   Register SwiftErrorVReg) const override;

  bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
                            ArrayRef<ArrayRef<Register>> VRegs,
                            FunctionLoweringInfo &FLI) const override;

  bool lowerCall(MachineIRBuilder &MIRBuilder,
                 CallLoweringInfo &Info) const override;

  bool enableBigEndian() const override;
};
struct M68kIncomingValueHandler : public CallLowering::IncomingValueHandler {
  M68kIncomingValueHandler(MachineIRBuilder &MIRBuilder,
                           MachineRegisterInfo &MRI)
      : CallLowering::IncomingValueHandler(MIRBuilder, MRI) {}

  uint64_t StackUsed;

private:
  void assignValueToReg(Register ValVReg, Register PhysReg,
                        CCValAssign VA) override;

  void assignValueToAddress(Register ValVReg, Register Addr, LLT MemTy,
                            MachinePointerInfo &MPO, CCValAssign &VA) override;

  Register getStackAddress(uint64_t Size, int64_t Offset,
                           MachinePointerInfo &MPO,
                           ISD::ArgFlagsTy Flags) override;
};

struct FormalArgHandler : public M68kIncomingValueHandler {
  FormalArgHandler(MachineIRBuilder &MIRBuilder, MachineRegisterInfo &MRI)
      : M68kIncomingValueHandler(MIRBuilder, MRI) {}
};

struct CallReturnHandler : public M68kIncomingValueHandler {
  CallReturnHandler(MachineIRBuilder &MIRBuilder, MachineRegisterInfo &MRI,
                    MachineInstrBuilder &MIB)
      : M68kIncomingValueHandler(MIRBuilder, MRI), MIB(MIB) {}

private:
  void assignValueToReg(Register ValVReg, Register PhysReg,
                        CCValAssign VA) override;

  MachineInstrBuilder &MIB;
};
} // end namespace llvm

#endif // LLVM_LIB_TARGET_M68K_GLSEL_M68KCALLLOWERING_H