llvm/llvm/lib/Target/ARM/ARMCallLowering.cpp

//===- llvm/lib/Target/ARM/ARMCallLowering.cpp - Call lowering ------------===//
//
// 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 implements the lowering of LLVM calls to machine code calls for
/// GlobalISel.
//
//===----------------------------------------------------------------------===//

#include "ARMCallLowering.h"
#include "ARMBaseInstrInfo.h"
#include "ARMISelLowering.h"
#include "ARMSubtarget.h"
#include "Utils/ARMBaseInfo.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
#include "llvm/CodeGen/GlobalISel/Utils.h"
#include "llvm/CodeGen/LowLevelTypeUtils.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/CodeGenTypes/LowLevelType.h"
#include "llvm/CodeGenTypes/MachineValueType.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Value.h"
#include "llvm/Support/Casting.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <functional>
#include <utility>

usingnamespacellvm;

// Whether Big-endian GISel is enabled, defaults to off, can be enabled for
// testing.
static cl::opt<bool>
    EnableGISelBigEndian("enable-arm-gisel-bigendian", cl::Hidden,
                         cl::init(false),
                         cl::desc("Enable Global-ISel Big Endian Lowering"));

ARMCallLowering::ARMCallLowering(const ARMTargetLowering &TLI)
    : … { … }

static bool isSupportedType(const DataLayout &DL, const ARMTargetLowering &TLI,
                            Type *T) { … }

namespace {

/// Helper class for values going out through an ABI boundary (used for handling
/// function return values and call parameters).
struct ARMOutgoingValueHandler : public CallLowering::OutgoingValueHandler { … };

} // end anonymous namespace

/// Lower the return value for the already existing \p Ret. This assumes that
/// \p MIRBuilder's insertion point is correct.
bool ARMCallLowering::lowerReturnVal(MachineIRBuilder &MIRBuilder,
                                     const Value *Val, ArrayRef<Register> VRegs,
                                     MachineInstrBuilder &Ret) const { … }

bool ARMCallLowering::lowerReturn(MachineIRBuilder &MIRBuilder,
                                  const Value *Val, ArrayRef<Register> VRegs,
                                  FunctionLoweringInfo &FLI) const { … }

namespace {

/// Helper class for values coming in through an ABI boundary (used for handling
/// formal arguments and call return values).
struct ARMIncomingValueHandler : public CallLowering::IncomingValueHandler { … };

struct FormalArgHandler : public ARMIncomingValueHandler { … };

} // end anonymous namespace

bool ARMCallLowering::lowerFormalArguments(MachineIRBuilder &MIRBuilder,
                                           const Function &F,
                                           ArrayRef<ArrayRef<Register>> VRegs,
                                           FunctionLoweringInfo &FLI) const { … }

namespace {

struct CallReturnHandler : public ARMIncomingValueHandler { … };

// FIXME: This should move to the ARMSubtarget when it supports all the opcodes.
unsigned getCallOpcode(const MachineFunction &MF, const ARMSubtarget &STI,
                       bool isDirect) { … }
} // end anonymous namespace

bool ARMCallLowering::lowerCall(MachineIRBuilder &MIRBuilder, CallLoweringInfo &Info) const { … }

bool ARMCallLowering::enableBigEndian() const { … }