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ad297e253a
Add minimal support to lower function calls. Support only functions with arguments/return that go through registers and have type i32. Patch by Petar Avramovic. Differential Revision: https://reviews.llvm.org/D45627 llvm-svn: 334071
79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
//===- MipsCallLowering.h ---------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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protected:
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virtual void assignValueToReg(unsigned ValVReg, unsigned PhysReg) = 0;
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bool assign(const CCValAssign &VA, unsigned vreg);
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MachineIRBuilder &MIRBuilder;
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MachineRegisterInfo &MRI;
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};
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MipsCallLowering(const MipsTargetLowering &TLI);
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bool lowerReturn(MachineIRBuilder &MIRBuiler, const Value *Val,
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unsigned VReg) 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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using FunTy =
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std::function<void(ISD::ArgFlagsTy flags, EVT vt, EVT argvt, bool used,
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unsigned origIdx, unsigned partOffs)>;
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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. Lambda will fill some info so we can tell MipsCCState to
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/// assign physical registers.
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void subTargetRegTypeForCallingConv(MachineIRBuilder &MIRBuilder,
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ArrayRef<ArgInfo> Args,
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ArrayRef<unsigned> OrigArgIndices,
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const FunTy &PushBack) const;
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/// Split structures and arrays, save original argument indices since
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/// Mips calling conv 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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