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//===- MipsCallLowering.h ---------------------------------------*- 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_MIPS_MIPSCALLLOWERING_H
#define LLVM_LIB_TARGET_MIPS_MIPSCALLLOWERING_H
#include "llvm/CodeGen/GlobalISel/CallLowering.h"
namespace llvm {
class MipsTargetLowering;
class MipsCallLowering : public CallLowering {
public:
class MipsHandler {
public:
MipsHandler(MachineIRBuilder &MIRBuilder, MachineRegisterInfo &MRI)
: MIRBuilder(MIRBuilder), MRI(MRI) {}
virtual ~MipsHandler() = default;
bool handle(ArrayRef<CCValAssign> ArgLocs,
ArrayRef<CallLowering::ArgInfo> Args);
protected:
bool assignVRegs(ArrayRef<Register> VRegs, ArrayRef<CCValAssign> ArgLocs,
unsigned ArgLocsStartIndex, const EVT &VT);
void setLeastSignificantFirst(SmallVectorImpl<Register> &VRegs);
MachineIRBuilder &MIRBuilder;
MachineRegisterInfo &MRI;
private:
bool assign(Register VReg, const CCValAssign &VA, const EVT &VT);
virtual Register getStackAddress(const CCValAssign &VA,
MachineMemOperand *&MMO) = 0;
virtual void assignValueToReg(Register ValVReg, const CCValAssign &VA,
const EVT &VT) = 0;
virtual void assignValueToAddress(Register ValVReg,
const CCValAssign &VA) = 0;
virtual bool handleSplit(SmallVectorImpl<Register> &VRegs,
ArrayRef<CCValAssign> ArgLocs,
unsigned ArgLocsStartIndex, Register ArgsReg,
const EVT &VT) = 0;
};
MipsCallLowering(const MipsTargetLowering &TLI);
bool lowerReturn(MachineIRBuilder &MIRBuilder, const Value *Val,
ArrayRef<Register> VRegs) const override;
bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
ArrayRef<ArrayRef<Register>> VRegs) const override;
bool lowerCall(MachineIRBuilder &MIRBuilder,
CallLoweringInfo &Info) const override;
private:
/// 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 DataLayout &DL, const ArgInfo &OrigArg,
unsigned OriginalIndex,
SmallVectorImpl<ArgInfo> &SplitArgs,
SmallVectorImpl<unsigned> &SplitArgsOrigIndices) const;
};
} // end namespace llvm
#endif // LLVM_LIB_TARGET_MIPS_MIPSCALLLOWERING_H
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