1 //===- AArch64CallLowering.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_AARCH64_AARCH64CALLLOWERING_H
16 #define LLVM_LIB_TARGET_AARCH64_AARCH64CALLLOWERING_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 AArch64TargetLowering;
27 class CCValAssign;
28 class DataLayout;
29 class MachineIRBuilder;
30 class MachineRegisterInfo;
31 class Type;
32 
33 class AArch64CallLowering: public CallLowering {
34 public:
35   AArch64CallLowering(const AArch64TargetLowering &TLI);
36 
37   bool lowerReturn(MachineIRBuilder &MIRBuiler, const Value *Val,
38                    unsigned VReg) const override;
39 
40   bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
41                             ArrayRef<unsigned> VRegs) const override;
42 
43   bool lowerCall(MachineIRBuilder &MIRBuilder, CallingConv::ID CallConv,
44                  const MachineOperand &Callee, const ArgInfo &OrigRet,
45                  ArrayRef<ArgInfo> OrigArgs) const override;
46 
47 private:
48   using RegHandler = std::function<void(MachineIRBuilder &, Type *, unsigned,
49                                         CCValAssign &)>;
50 
51   using MemHandler =
52       std::function<void(MachineIRBuilder &, int, CCValAssign &)>;
53 
54   using SplitArgTy = std::function<void(unsigned, uint64_t)>;
55 
56   void splitToValueTypes(const ArgInfo &OrigArgInfo,
57                          SmallVectorImpl<ArgInfo> &SplitArgs,
58                          const DataLayout &DL, MachineRegisterInfo &MRI,
59                          CallingConv::ID CallConv,
60                          const SplitArgTy &SplitArg) const;
61 };
62 
63 } // end namespace llvm
64 
65 #endif // LLVM_LIB_TARGET_AARCH64_AARCH64CALLLOWERING_H
66