1//===- AArch64CallLowering.h - Call lowering --------------------*- 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_AARCH64_AARCH64CALLLOWERING_H
15#define LLVM_LIB_TARGET_AARCH64_AARCH64CALLLOWERING_H
16
17#include "llvm/ADT/ArrayRef.h"
18#include "llvm/CodeGen/GlobalISel/CallLowering.h"
19#include "llvm/IR/CallingConv.h"
20#include <cstdint>
21#include <functional>
22
23namespace llvm {
24
25class AArch64TargetLowering;
26class CCValAssign;
27class MachineIRBuilder;
28class Type;
29
30class AArch64CallLowering: public CallLowering {
31public:
32 AArch64CallLowering(const AArch64TargetLowering &TLI);
33
34 bool lowerReturn(MachineIRBuilder &MIRBuilder, const Value *Val,
35 ArrayRef<Register> VRegs, FunctionLoweringInfo &FLI,
36 Register SwiftErrorVReg) const override;
37
38 bool canLowerReturn(MachineFunction &MF, CallingConv::ID CallConv,
39 SmallVectorImpl<BaseArgInfo> &Outs,
40 bool IsVarArg) const override;
41
42 bool fallBackToDAGISel(const MachineFunction &MF) const override;
43
44 bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
45 ArrayRef<ArrayRef<Register>> VRegs,
46 FunctionLoweringInfo &FLI) const override;
47
48 bool lowerCall(MachineIRBuilder &MIRBuilder,
49 CallLoweringInfo &Info) const override;
50
51 /// Returns true if the call can be lowered as a tail call.
52 bool
53 isEligibleForTailCallOptimization(MachineIRBuilder &MIRBuilder,
54 CallLoweringInfo &Info,
55 SmallVectorImpl<ArgInfo> &InArgs,
56 SmallVectorImpl<ArgInfo> &OutArgs) const;
57
58 bool supportSwiftError() const override { return true; }
59
60 bool isTypeIsValidForThisReturn(EVT Ty) const override;
61
62private:
63 using RegHandler = std::function<void(MachineIRBuilder &, Type *, unsigned,
64 CCValAssign &)>;
65
66 using MemHandler =
67 std::function<void(MachineIRBuilder &, int, CCValAssign &)>;
68
69 void saveVarArgRegisters(MachineIRBuilder &MIRBuilder,
70 CallLowering::IncomingValueHandler &Handler,
71 CCState &CCInfo) const;
72
73 bool lowerTailCall(MachineIRBuilder &MIRBuilder, CallLoweringInfo &Info,
74 SmallVectorImpl<ArgInfo> &OutArgs) const;
75
76 bool
77 doCallerAndCalleePassArgsTheSameWay(CallLoweringInfo &Info,
78 MachineFunction &MF,
79 SmallVectorImpl<ArgInfo> &InArgs) const;
80
81 bool
82 areCalleeOutgoingArgsTailCallable(CallLoweringInfo &Info, MachineFunction &MF,
83 SmallVectorImpl<ArgInfo> &OutArgs) const;
84};
85
86} // end namespace llvm
87
88#endif // LLVM_LIB_TARGET_AARCH64_AARCH64CALLLOWERING_H
89