lib/Target/Mips/MipsCallLowering.h

   1 //===- MipsCallLowering.h ---------------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 /// \file
  10 /// This file describes how to lower LLVM calls to machine code calls.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_LIB_TARGET_MIPS_MIPSCALLLOWERING_H
  15 #define LLVM_LIB_TARGET_MIPS_MIPSCALLLOWERING_H
  16
  17 #include "llvm/CodeGen/GlobalISel/CallLowering.h"
  18
  19 namespace llvm {
  20
  21 class MipsTargetLowering;
  22
  23 class MipsCallLowering : public CallLowering {
  24
  25 public:
  26   class MipsHandler {
  27   public:
  28     MipsHandler(MachineIRBuilder &MIRBuilder, MachineRegisterInfo &MRI)
  29         : MIRBuilder(MIRBuilder), MRI(MRI) {}
  30
  31     virtual ~MipsHandler() = default;
  32
  33     bool handle(ArrayRef<CCValAssign> ArgLocs,
  34                 ArrayRef<CallLowering::ArgInfo> Args);
  35
  36   protected:
  37     bool assignVRegs(ArrayRef<unsigned> VRegs, ArrayRef<CCValAssign> ArgLocs,
  38                      unsigned Index);
  39
  40     void setLeastSignificantFirst(SmallVectorImpl<unsigned> &VRegs);
  41
  42     MachineIRBuilder &MIRBuilder;
  43     MachineRegisterInfo &MRI;
  44
  45   private:
  46     bool assign(unsigned VReg, const CCValAssign &VA);
  47
  48     virtual unsigned getStackAddress(const CCValAssign &VA,
  49                                      MachineMemOperand *&MMO) = 0;
  50
  51     virtual void assignValueToReg(unsigned ValVReg, const CCValAssign &VA) = 0;
  52
  53     virtual void assignValueToAddress(unsigned ValVReg,
  54                                       const CCValAssign &VA) = 0;
  55
  56     virtual bool handleSplit(SmallVectorImpl<unsigned> &VRegs,
  57                              ArrayRef<CCValAssign> ArgLocs,
  58                              unsigned ArgLocsStartIndex, unsigned ArgsReg) = 0;
  59   };
  60
  61   MipsCallLowering(const MipsTargetLowering &TLI);
  62
  63   bool lowerReturn(MachineIRBuilder &MIRBuilder, const Value *Val,
  64                    ArrayRef<unsigned> VRegs) const override;
  65
  66   bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
  67                             ArrayRef<unsigned> VRegs) const override;
  68
  69   bool lowerCall(MachineIRBuilder &MIRBuilder, CallingConv::ID CallConv,
  70                  const MachineOperand &Callee, const ArgInfo &OrigRet,
  71                  ArrayRef<ArgInfo> OrigArgs) const override;
  72
  73 private:
  74   /// Based on registers available on target machine split or extend
  75   /// type if needed, also change pointer type to appropriate integer
  76   /// type.
  77   template <typename T>
  78   void subTargetRegTypeForCallingConv(const Function &F, ArrayRef<ArgInfo> Args,
  79                                       ArrayRef<unsigned> OrigArgIndices,
  80                                       SmallVectorImpl<T> &ISDArgs) const;
  81
  82   /// Split structures and arrays, save original argument indices since
  83   /// Mips calling convention needs info about original argument type.
  84   void splitToValueTypes(const ArgInfo &OrigArg, unsigned OriginalIndex,
  85                          SmallVectorImpl<ArgInfo> &SplitArgs,
  86                          SmallVectorImpl<unsigned> &SplitArgsOrigIndices) const;
  87 };
  88
  89 } // end namespace llvm
  90
  91 #endif // LLVM_LIB_TARGET_MIPS_MIPSCALLLOWERING_H