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<Register> VRegs, ArrayRef<CCValAssign> ArgLocs,
  38                      unsigned ArgLocsStartIndex, const EVT &VT);
  39
  40     void setLeastSignificantFirst(SmallVectorImpl<Register> &VRegs);
  41
  42     MachineIRBuilder &MIRBuilder;
  43     MachineRegisterInfo &MRI;
  44
  45   private:
  46     bool assign(Register VReg, const CCValAssign &VA, const EVT &VT);
  47
  48     virtual Register getStackAddress(const CCValAssign &VA,
  49                                      MachineMemOperand *&MMO) = 0;
  50
  51     virtual void assignValueToReg(Register ValVReg, const CCValAssign &VA,
  52                                   const EVT &VT) = 0;
  53
  54     virtual void assignValueToAddress(Register ValVReg,
  55                                       const CCValAssign &VA) = 0;
  56
  57     virtual bool handleSplit(SmallVectorImpl<Register> &VRegs,
  58                              ArrayRef<CCValAssign> ArgLocs,
  59                              unsigned ArgLocsStartIndex, Register ArgsReg,
  60                              const EVT &VT) = 0;
  61   };
  62
  63   MipsCallLowering(const MipsTargetLowering &TLI);
  64
  65   bool lowerReturn(MachineIRBuilder &MIRBuilder, const Value *Val,
  66                    ArrayRef<Register> VRegs) const override;
  67
  68   bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
  69                             ArrayRef<ArrayRef<Register>> VRegs) const override;
  70
  71   bool lowerCall(MachineIRBuilder &MIRBuilder,
  72                  CallLoweringInfo &Info) const override;
  73
  74 private:
  75   /// Based on registers available on target machine split or extend
  76   /// type if needed, also change pointer type to appropriate integer
  77   /// type.
  78   template <typename T>
  79   void subTargetRegTypeForCallingConv(const Function &F, ArrayRef<ArgInfo> Args,
  80                                       ArrayRef<unsigned> OrigArgIndices,
  81                                       SmallVectorImpl<T> &ISDArgs) const;
  82
  83   /// Split structures and arrays, save original argument indices since
  84   /// Mips calling convention needs info about original argument type.
  85   void splitToValueTypes(const ArgInfo &OrigArg, unsigned OriginalIndex,
  86                          SmallVectorImpl<ArgInfo> &SplitArgs,
  87                          SmallVectorImpl<unsigned> &SplitArgsOrigIndices) const;
  88 };
  89
  90 } // end namespace llvm
  91
  92 #endif // LLVM_LIB_TARGET_MIPS_MIPSCALLLOWERING_H