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//===- AArch64CallLowering.h - Call lowering --------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file describes how to lower LLVM calls to machine code calls.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_AARCH64_AARCH64CALLLOWERING_H
#define LLVM_LIB_TARGET_AARCH64_AARCH64CALLLOWERING_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/CodeGen/GlobalISel/CallLowering.h"
#include "llvm/IR/CallingConv.h"
#include <cstdint>
#include <functional>
namespace llvm {
class AArch64TargetLowering;
class CCValAssign;
class DataLayout;
class MachineIRBuilder;
class MachineRegisterInfo;
class Type;
class AArch64CallLowering: public CallLowering {
public:
AArch64CallLowering(const AArch64TargetLowering &TLI);
bool lowerReturn(MachineIRBuilder &MIRBuilder, const Value *Val,
ArrayRef<Register> VRegs,
Register SwiftErrorVReg) const override;
bool fallBackToDAGISel(const Function &F) const override;
bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
ArrayRef<ArrayRef<Register>> VRegs) const override;
bool lowerCall(MachineIRBuilder &MIRBuilder,
CallLoweringInfo &Info) const override;
/// Returns true if the call can be lowered as a tail call.
bool
isEligibleForTailCallOptimization(MachineIRBuilder &MIRBuilder,
CallLoweringInfo &Info,
SmallVectorImpl<ArgInfo> &InArgs,
SmallVectorImpl<ArgInfo> &OutArgs) const;
bool supportSwiftError() const override { return true; }
private:
using RegHandler = std::function<void(MachineIRBuilder &, Type *, unsigned,
CCValAssign &)>;
using MemHandler =
std::function<void(MachineIRBuilder &, int, CCValAssign &)>;
void splitToValueTypes(const ArgInfo &OrigArgInfo,
SmallVectorImpl<ArgInfo> &SplitArgs,
const DataLayout &DL, MachineRegisterInfo &MRI,
CallingConv::ID CallConv) const;
bool lowerTailCall(MachineIRBuilder &MIRBuilder, CallLoweringInfo &Info,
SmallVectorImpl<ArgInfo> &OutArgs) const;
bool
doCallerAndCalleePassArgsTheSameWay(CallLoweringInfo &Info,
MachineFunction &MF,
SmallVectorImpl<ArgInfo> &InArgs) const;
bool
areCalleeOutgoingArgsTailCallable(CallLoweringInfo &Info, MachineFunction &MF,
SmallVectorImpl<ArgInfo> &OutArgs) const;
};
} // end namespace llvm
#endif // LLVM_LIB_TARGET_AARCH64_AARCH64CALLLOWERING_H
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