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 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 63