llvm/lib/Target/PowerPC/GISel/PPCCallLowering.h

   1 //===-- PPCCallLowering.h - Call lowering for GlobalISel -------*- 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_POWERPC_GISEL_PPCCALLLOWERING_H
  15 #define LLVM_LIB_TARGET_POWERPC_GISEL_PPCCALLLOWERING_H
  16
  17 #include "PPCISelLowering.h"
  18 #include "llvm/CodeGen/GlobalISel/CallLowering.h"
  19 #include "llvm/IR/CallingConv.h"
  20
  21 namespace llvm {
  22
  23 class PPCTargetLowering;
  24
  25 class PPCCallLowering : public CallLowering {
  26 public:
  27   PPCCallLowering(const PPCTargetLowering &TLI);
  28
  29   bool lowerReturn(MachineIRBuilder &MIRBuilder, const Value *Val,
  30                    ArrayRef<Register> VRegs, FunctionLoweringInfo &FLI,
  31                    Register SwiftErrorVReg) const override;
  32   bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
  33                             ArrayRef<ArrayRef<Register>> VRegs,
  34                             FunctionLoweringInfo &FLI) const override;
  35   bool lowerCall(MachineIRBuilder &MIRBuilder,
  36                  CallLoweringInfo &Info) const override;
  37 };
  38
  39 class PPCIncomingValueHandler : public CallLowering::IncomingValueHandler {
  40 public:
  41   PPCIncomingValueHandler(MachineIRBuilder &MIRBuilder,
  42                           MachineRegisterInfo &MRI)
  43       : CallLowering::IncomingValueHandler(MIRBuilder, MRI) {}
  44
  45   uint64_t StackUsed;
  46
  47 private:
  48   void assignValueToReg(Register ValVReg, Register PhysReg,
  49                         const CCValAssign &VA) override;
  50
  51   void assignValueToAddress(Register ValVReg, Register Addr, LLT MemTy,
  52                             const MachinePointerInfo &MPO,
  53                             const CCValAssign &VA) override;
  54
  55   Register getStackAddress(uint64_t Size, int64_t Offset,
  56                            MachinePointerInfo &MPO,
  57                            ISD::ArgFlagsTy Flags) override;
  58
  59   virtual void markPhysRegUsed(unsigned PhysReg) = 0;
  60 };
  61
  62 class FormalArgHandler : public PPCIncomingValueHandler {
  63
  64   void markPhysRegUsed(unsigned PhysReg) override;
  65
  66 public:
  67   FormalArgHandler(MachineIRBuilder &MIRBuilder, MachineRegisterInfo &MRI)
  68       : PPCIncomingValueHandler(MIRBuilder, MRI) {}
  69 };
  70
  71 } // end namespace llvm
  72
  73 #endif