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92 lines
3.3 KiB
C++
92 lines
3.3 KiB
C++
//===- MipsCallLowering.h ---------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file
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/// This file describes how to lower LLVM calls to machine code calls.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_MIPS_MIPSCALLLOWERING_H
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#define LLVM_LIB_TARGET_MIPS_MIPSCALLLOWERING_H
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#include "llvm/CodeGen/GlobalISel/CallLowering.h"
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namespace llvm {
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class MipsTargetLowering;
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class MipsCallLowering : public CallLowering {
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public:
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class MipsHandler {
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public:
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MipsHandler(MachineIRBuilder &MIRBuilder, MachineRegisterInfo &MRI)
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: MIRBuilder(MIRBuilder), MRI(MRI) {}
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virtual ~MipsHandler() = default;
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bool handle(ArrayRef<CCValAssign> ArgLocs,
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ArrayRef<CallLowering::ArgInfo> Args);
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protected:
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bool assignVRegs(ArrayRef<unsigned> VRegs, ArrayRef<CCValAssign> ArgLocs,
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unsigned Index);
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void setLeastSignificantFirst(SmallVectorImpl<unsigned> &VRegs);
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MachineIRBuilder &MIRBuilder;
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MachineRegisterInfo &MRI;
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private:
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bool assign(unsigned VReg, const CCValAssign &VA);
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virtual unsigned getStackAddress(const CCValAssign &VA,
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MachineMemOperand *&MMO) = 0;
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virtual void assignValueToReg(unsigned ValVReg, const CCValAssign &VA) = 0;
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virtual void assignValueToAddress(unsigned ValVReg,
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const CCValAssign &VA) = 0;
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virtual bool handleSplit(SmallVectorImpl<unsigned> &VRegs,
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ArrayRef<CCValAssign> ArgLocs,
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unsigned ArgLocsStartIndex, unsigned ArgsReg) = 0;
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};
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MipsCallLowering(const MipsTargetLowering &TLI);
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bool lowerReturn(MachineIRBuilder &MIRBuilder, const Value *Val,
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ArrayRef<unsigned> VRegs) const override;
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bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
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ArrayRef<unsigned> VRegs) const override;
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bool lowerCall(MachineIRBuilder &MIRBuilder, CallingConv::ID CallConv,
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const MachineOperand &Callee, const ArgInfo &OrigRet,
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ArrayRef<ArgInfo> OrigArgs) const override;
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private:
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/// Based on registers available on target machine split or extend
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/// type if needed, also change pointer type to appropriate integer
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/// type.
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template <typename T>
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void subTargetRegTypeForCallingConv(const Function &F, ArrayRef<ArgInfo> Args,
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ArrayRef<unsigned> OrigArgIndices,
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SmallVectorImpl<T> &ISDArgs) const;
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/// Split structures and arrays, save original argument indices since
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/// Mips calling convention needs info about original argument type.
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void splitToValueTypes(const ArgInfo &OrigArg, unsigned OriginalIndex,
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SmallVectorImpl<ArgInfo> &SplitArgs,
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SmallVectorImpl<unsigned> &SplitArgsOrigIndices) const;
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};
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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_MIPS_MIPSCALLLOWERING_H
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