1 //===- llvm/lib/Target/X86/X86CallLowering.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_X86_X86CALLLOWERING_H
16 #define LLVM_LIB_TARGET_X86_X86CALLLOWERING_H
17 
18 #include "llvm/ADT/ArrayRef.h"
19 #include "llvm/CodeGen/GlobalISel/CallLowering.h"
20 #include <functional>
21 
22 namespace llvm {
23 
24 class DataLayout;
25 class MachineRegisterInfo;
26 class X86TargetLowering;
27 
28 class X86CallLowering : public CallLowering {
29 public:
30   X86CallLowering(const X86TargetLowering &TLI);
31 
32   bool lowerReturn(MachineIRBuilder &MIRBuiler, const Value *Val,
33                    unsigned VReg) const override;
34 
35   bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
36                             ArrayRef<unsigned> VRegs) const override;
37 
38   bool lowerCall(MachineIRBuilder &MIRBuilder, CallingConv::ID CallConv,
39                  const MachineOperand &Callee, const ArgInfo &OrigRet,
40                  ArrayRef<ArgInfo> OrigArgs) const override;
41 
42 private:
43   /// A function of this type is used to perform value split action.
44   using SplitArgTy = std::function<void(ArrayRef<unsigned>)>;
45 
46   bool splitToValueTypes(const ArgInfo &OrigArgInfo,
47                          SmallVectorImpl<ArgInfo> &SplitArgs,
48                          const DataLayout &DL, MachineRegisterInfo &MRI,
49                          SplitArgTy SplitArg) const;
50 };
51 
52 } // end namespace llvm
53 
54 #endif // LLVM_LIB_TARGET_X86_X86CALLLOWERING_H
55