llvm/llvm/lib/Target/Mips/MipsTargetObjectFile.cpp

//===-- MipsTargetObjectFile.cpp - Mips Object Files ----------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

#include "MipsTargetObjectFile.h"
#include "MipsSubtarget.h"
#include "MipsTargetMachine.h"
#include "MCTargetDesc/MipsMCExpr.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Target/TargetMachine.h"
usingnamespacellvm;

static cl::opt<unsigned>
SSThreshold("mips-ssection-threshold", cl::Hidden,
            cl::desc("Small data and bss section threshold size (default=8)"),
            cl::init(8));

static cl::opt<bool>
LocalSData("mlocal-sdata", cl::Hidden,
           cl::desc("MIPS: Use gp_rel for object-local data."),
           cl::init(true));

static cl::opt<bool>
ExternSData("mextern-sdata", cl::Hidden,
            cl::desc("MIPS: Use gp_rel for data that is not defined by the "
                     "current object."),
            cl::init(true));

static cl::opt<bool>
EmbeddedData("membedded-data", cl::Hidden,
             cl::desc("MIPS: Try to allocate variables in the following"
                      " sections if possible: .rodata, .sdata, .data ."),
             cl::init(false));

void MipsTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM){ … }

// A address must be loaded from a small section if its size is less than the
// small section size threshold. Data in this section must be addressed using
// gp_rel operator.
static bool IsInSmallSection(uint64_t Size) { … }

/// Return true if this global address should be placed into small data/bss
/// section.
bool MipsTargetObjectFile::IsGlobalInSmallSection(
    const GlobalObject *GO, const TargetMachine &TM) const { … }

/// Return true if this global address should be placed into small data/bss
/// section.
bool MipsTargetObjectFile::
IsGlobalInSmallSection(const GlobalObject *GO, const TargetMachine &TM,
                       SectionKind Kind) const { … }

/// Return true if this global address should be placed into small data/bss
/// section. This method does all the work, except for checking the section
/// kind.
bool MipsTargetObjectFile::
IsGlobalInSmallSectionImpl(const GlobalObject *GO,
                           const TargetMachine &TM) const { … }

MCSection *MipsTargetObjectFile::SelectSectionForGlobal(
    const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const { … }

/// Return true if this constant should be placed into small data section.
bool MipsTargetObjectFile::IsConstantInSmallSection(
    const DataLayout &DL, const Constant *CN, const TargetMachine &TM) const { … }

/// Return true if this constant should be placed into small data section.
MCSection *MipsTargetObjectFile::getSectionForConstant(const DataLayout &DL,
                                                       SectionKind Kind,
                                                       const Constant *C,
                                                       Align &Alignment) const { … }

const MCExpr *
MipsTargetObjectFile::getDebugThreadLocalSymbol(const MCSymbol *Sym) const { … }