llvm/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp

//===-- MipsAsmBackend.cpp - Mips Asm Backend  ----------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements the MipsAsmBackend class.
//
//===----------------------------------------------------------------------===//
//

#include "MCTargetDesc/MipsAsmBackend.h"
#include "MCTargetDesc/MipsABIInfo.h"
#include "MCTargetDesc/MipsFixupKinds.h"
#include "MCTargetDesc/MipsMCExpr.h"
#include "MCTargetDesc/MipsMCTargetDesc.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDirectives.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCFixupKindInfo.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCTargetOptions.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"

usingnamespacellvm;

// Prepare value for the target space for it
static unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
                                 MCContext &Ctx) { … }

std::unique_ptr<MCObjectTargetWriter>
MipsAsmBackend::createObjectTargetWriter() const { … }

// Little-endian fixup data byte ordering:
//   mips32r2:   a | b | x | x
//   microMIPS:  x | x | a | b

static bool needsMMLEByteOrder(unsigned Kind) { … }

// Calculate index for microMIPS specific little endian byte order
static unsigned calculateMMLEIndex(unsigned i) { … }

/// ApplyFixup - Apply the \p Value for given \p Fixup into the provided
/// data fragment, at the offset specified by the fixup and following the
/// fixup kind as appropriate.
void MipsAsmBackend::applyFixup(const MCAssembler &Asm, const MCFixup &Fixup,
                                const MCValue &Target,
                                MutableArrayRef<char> Data, uint64_t Value,
                                bool IsResolved,
                                const MCSubtargetInfo *STI) const { … }

std::optional<MCFixupKind> MipsAsmBackend::getFixupKind(StringRef Name) const { … }

const MCFixupKindInfo &MipsAsmBackend::
getFixupKindInfo(MCFixupKind Kind) const { … }

/// WriteNopData - Write an (optimal) nop sequence of Count bytes
/// to the given output. If the target cannot generate such a sequence,
/// it should return an error.
///
/// \return - True on success.
bool MipsAsmBackend::writeNopData(raw_ostream &OS, uint64_t Count,
                                  const MCSubtargetInfo *STI) const { … }

bool MipsAsmBackend::shouldForceRelocation(const MCAssembler &Asm,
                                           const MCFixup &Fixup,
                                           const MCValue &Target,
                                           const MCSubtargetInfo *STI) { … }

bool MipsAsmBackend::isMicroMips(const MCSymbol *Sym) const { … }

MCAsmBackend *llvm::createMipsAsmBackend(const Target &T,
                                         const MCSubtargetInfo &STI,
                                         const MCRegisterInfo &MRI,
                                         const MCTargetOptions &Options) { … }