lib/Target/ARM/ARMCallLowering.h

   1 //===- llvm/lib/Target/ARM/ARMCallLowering.h - Call lowering ----*- 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_ARM_ARMCALLLOWERING_H
  15 #define LLVM_LIB_TARGET_ARM_ARMCALLLOWERING_H
  16
  17 #include "llvm/ADT/ArrayRef.h"
  18 #include "llvm/CodeGen/GlobalISel/CallLowering.h"
  19 #include "llvm/IR/CallingConv.h"
  20 #include <cstdint>
  21 #include <functional>
  22
  23 namespace llvm {
  24
  25 class ARMTargetLowering;
  26 class MachineFunction;
  27 class MachineInstrBuilder;
  28 class MachineIRBuilder;
  29 class Value;
  30
  31 class ARMCallLowering : public CallLowering {
  32 public:
  33   ARMCallLowering(const ARMTargetLowering &TLI);
  34
  35   bool lowerReturn(MachineIRBuilder &MIRBuilder, const Value *Val,
  36                    ArrayRef<unsigned> VRegs) const override;
  37
  38   bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
  39                             ArrayRef<unsigned> VRegs) const override;
  40
  41   bool lowerCall(MachineIRBuilder &MIRBuilder, CallingConv::ID CallConv,
  42                  const MachineOperand &Callee, const ArgInfo &OrigRet,
  43                  ArrayRef<ArgInfo> OrigArgs) const override;
  44
  45 private:
  46   bool lowerReturnVal(MachineIRBuilder &MIRBuilder, const Value *Val,
  47                       ArrayRef<unsigned> VRegs,
  48                       MachineInstrBuilder &Ret) const;
  49
  50   using SplitArgTy = std::function<void(unsigned Reg, uint64_t Offset)>;
  51
  52   /// Split an argument into one or more arguments that the CC lowering can cope
  53   /// with (e.g. replace pointers with integers).
  54   void splitToValueTypes(const ArgInfo &OrigArg,
  55                          SmallVectorImpl<ArgInfo> &SplitArgs,
  56                          MachineFunction &MF,
  57                          const SplitArgTy &PerformArgSplit) const;
  58 };
  59
  60 } // end namespace llvm
  61
  62 #endif // LLVM_LIB_TARGET_ARM_ARMCALLLOWERING_H