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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 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