1 //===-- PPCCallLowering.h - Call lowering for GlobalISel -------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 ///
9 /// \file
10 /// This file describes how to lower LLVM calls to machine code calls.
11 ///
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_LIB_TARGET_POWERPC_GISEL_PPCCALLLOWERING_H
15 #define LLVM_LIB_TARGET_POWERPC_GISEL_PPCCALLLOWERING_H
16 
17 #include "PPCISelLowering.h"
18 #include "llvm/CodeGen/GlobalISel/CallLowering.h"
19 #include "llvm/IR/CallingConv.h"
20 
21 namespace llvm {
22 
23 class PPCTargetLowering;
24 
25 class PPCCallLowering : public CallLowering {
26 public:
27   PPCCallLowering(const PPCTargetLowering &TLI);
28 
29   bool lowerReturn(MachineIRBuilder &MIRBuilder, const Value *Val,
30                    ArrayRef<Register> VRegs, FunctionLoweringInfo &FLI,
31                    Register SwiftErrorVReg) const override;
32   bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
33                             ArrayRef<ArrayRef<Register>> VRegs,
34                             FunctionLoweringInfo &FLI) const override;
35   bool lowerCall(MachineIRBuilder &MIRBuilder,
36                  CallLoweringInfo &Info) const override;
37 };
38 
39 class PPCIncomingValueHandler : public CallLowering::IncomingValueHandler {
40 public:
41   PPCIncomingValueHandler(MachineIRBuilder &MIRBuilder,
42                           MachineRegisterInfo &MRI)
43       : CallLowering::IncomingValueHandler(MIRBuilder, MRI) {}
44 
45   uint64_t StackUsed;
46 
47 private:
48   void assignValueToReg(Register ValVReg, Register PhysReg,
49                         CCValAssign VA) override;
50 
51   void assignValueToAddress(Register ValVReg, Register Addr, LLT MemTy,
52                             MachinePointerInfo &MPO, CCValAssign &VA) override;
53 
54   Register getStackAddress(uint64_t Size, int64_t Offset,
55                            MachinePointerInfo &MPO,
56                            ISD::ArgFlagsTy Flags) override;
57 
58   virtual void markPhysRegUsed(unsigned PhysReg) = 0;
59 };
60 
61 class FormalArgHandler : public PPCIncomingValueHandler {
62 
63   void markPhysRegUsed(unsigned PhysReg) override;
64 
65 public:
66   FormalArgHandler(MachineIRBuilder &MIRBuilder, MachineRegisterInfo &MRI)
67       : PPCIncomingValueHandler(MIRBuilder, MRI) {}
68 };
69 
70 } // end namespace llvm
71 
72 #endif
73