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//===- MipsCallLowering.h ---------------------------------------*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See 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.
#include "llvm/CodeGen/GlobalISel/CallLowering.h"
namespace llvm {
class MipsTargetLowering;
class MipsCallLowering : public CallLowering {
class MipsHandler {
MipsHandler(MachineIRBuilder &MIRBuilder, MachineRegisterInfo &MRI)
: MIRBuilder(MIRBuilder), MRI(MRI) {}
virtual ~MipsHandler() = default;
bool handle(ArrayRef<CCValAssign> ArgLocs,
ArrayRef<CallLowering::ArgInfo> Args);
bool assignVRegs(ArrayRef<unsigned> VRegs, ArrayRef<CCValAssign> ArgLocs,
unsigned Index);
void setLeastSignificantFirst(SmallVectorImpl<unsigned> &VRegs);
MachineIRBuilder &MIRBuilder;
MachineRegisterInfo &MRI;
bool assign(unsigned VReg, const CCValAssign &VA);
virtual unsigned getStackAddress(const CCValAssign &VA,
MachineMemOperand *&MMO) = 0;
virtual void assignValueToReg(unsigned ValVReg, const CCValAssign &VA) = 0;
virtual void assignValueToAddress(unsigned ValVReg,
const CCValAssign &VA) = 0;
virtual bool handleSplit(SmallVectorImpl<unsigned> &VRegs,
ArrayRef<CCValAssign> ArgLocs,
unsigned ArgLocsStartIndex, unsigned ArgsReg) = 0;
MipsCallLowering(const MipsTargetLowering &TLI);
bool lowerReturn(MachineIRBuilder &MIRBuilder, const Value *Val,
ArrayRef<unsigned> VRegs) const override;
bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
ArrayRef<unsigned> VRegs) const override;
bool lowerCall(MachineIRBuilder &MIRBuilder, CallingConv::ID CallConv,
const MachineOperand &Callee, const ArgInfo &OrigRet,
ArrayRef<ArgInfo> OrigArgs) const override;
/// Based on registers available on target machine split or extend
/// type if needed, also change pointer type to appropriate integer
/// type.
template <typename T>
void subTargetRegTypeForCallingConv(const Function &F, ArrayRef<ArgInfo> Args,
ArrayRef<unsigned> OrigArgIndices,
SmallVectorImpl<T> &ISDArgs) const;
/// Split structures and arrays, save original argument indices since
/// Mips calling convention needs info about original argument type.
void splitToValueTypes(const ArgInfo &OrigArg, unsigned OriginalIndex,
SmallVectorImpl<ArgInfo> &SplitArgs,
SmallVectorImpl<unsigned> &SplitArgsOrigIndices) const;
} // end namespace llvm