RISCVCallLowering.h

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//===-- RISCVCallLowering.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 describes how to lower LLVM calls to machine code calls.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_LIB_TARGET_RISCV_RISCVCALLLOWERING_H
#define LLVM_LIB_TARGET_RISCV_RISCVCALLLOWERING_H
 
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/GlobalISel/CallLowering.h"
 
namespace llvm {
 
class MachineInstrBuilder;
class MachineIRBuilder;
class RISCVTargetLowering;
 
class RISCVCallLowering : public CallLowering {
 
public:
  RISCVCallLowering(const RISCVTargetLowering &TLI);
 
  bool lowerReturn(MachineIRBuilder &MIRBuiler, const Value *Val,
                   ArrayRef<Register> VRegs,
                   FunctionLoweringInfo &FLI) const override;
 
  bool canLowerReturn(MachineFunction &MF, CallingConv::ID CallConv,
                      SmallVectorImpl<BaseArgInfo> &Outs,
                      bool IsVarArg) 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;
 
private:
  void saveVarArgRegisters(MachineIRBuilder &MIRBuilder,
                           CallLowering::IncomingValueHandler &Handler,
                           IncomingValueAssigner &Assigner,
                           CCState &CCInfo) const;
};
 
} // end namespace llvm
 
#endif // LLVM_LIB_TARGET_RISCV_RISCVCALLLOWERING_H