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       1             : //===- llvm/lib/Target/ARM/ARMCallLowering.h - Call lowering ----*- C++ -*-===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : /// \file
      11             : /// This file describes how to lower LLVM calls to machine code calls.
      12             : //
      13             : //===----------------------------------------------------------------------===//
      14             : 
      15             : #ifndef LLVM_LIB_TARGET_ARM_ARMCALLLOWERING_H
      16             : #define LLVM_LIB_TARGET_ARM_ARMCALLLOWERING_H
      17             : 
      18             : #include "llvm/ADT/ArrayRef.h"
      19             : #include "llvm/CodeGen/GlobalISel/CallLowering.h"
      20             : #include "llvm/IR/CallingConv.h"
      21             : #include <cstdint>
      22             : #include <functional>
      23             : 
      24             : namespace llvm {
      25             : 
      26             : class ARMTargetLowering;
      27             : class MachineFunction;
      28             : class MachineInstrBuilder;
      29             : class MachineIRBuilder;
      30             : class Value;
      31             : 
      32        4793 : class ARMCallLowering : public CallLowering {
      33             : public:
      34             :   ARMCallLowering(const ARMTargetLowering &TLI);
      35             : 
      36             :   bool lowerReturn(MachineIRBuilder &MIRBuiler, const Value *Val,
      37             :                    unsigned VReg) const override;
      38             : 
      39             :   bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
      40             :                             ArrayRef<unsigned> VRegs) const override;
      41             : 
      42             :   bool lowerCall(MachineIRBuilder &MIRBuilder, CallingConv::ID CallConv,
      43             :                  const MachineOperand &Callee, const ArgInfo &OrigRet,
      44             :                  ArrayRef<ArgInfo> OrigArgs) const override;
      45             : 
      46             : private:
      47             :   bool lowerReturnVal(MachineIRBuilder &MIRBuilder, const Value *Val,
      48             :                       unsigned VReg, 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