llvm/llvm/lib/Target/TargetLoweringObjectFile.cpp

//===-- llvm/Target/TargetLoweringObjectFile.cpp - Object File Info -------===//
//
// 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 classes used to handle lowerings specific to common
// object file formats.
//
//===----------------------------------------------------------------------===//

#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/SectionKind.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
usingnamespacellvm;

//===----------------------------------------------------------------------===//
//                              Generic Code
//===----------------------------------------------------------------------===//

/// Initialize - this method must be called before any actual lowering is
/// done.  This specifies the current context for codegen, and gives the
/// lowering implementations a chance to set up their default sections.
void TargetLoweringObjectFile::Initialize(MCContext &ctx,
                                          const TargetMachine &TM) { … }

TargetLoweringObjectFile::~TargetLoweringObjectFile() { … }

unsigned TargetLoweringObjectFile::getCallSiteEncoding() const { … }

static bool isNullOrUndef(const Constant *C) { … }

static bool isSuitableForBSS(const GlobalVariable *GV) { … }

/// IsNullTerminatedString - Return true if the specified constant (which is
/// known to have a type that is an array of 1/2/4 byte elements) ends with a
/// nul value and contains no other nuls in it.  Note that this is more general
/// than ConstantDataSequential::isString because we allow 2 & 4 byte strings.
static bool IsNullTerminatedString(const Constant *C) { … }

MCSymbol *TargetLoweringObjectFile::getSymbolWithGlobalValueBase(
    const GlobalValue *GV, StringRef Suffix, const TargetMachine &TM) const { … }

MCSymbol *TargetLoweringObjectFile::getCFIPersonalitySymbol(
    const GlobalValue *GV, const TargetMachine &TM,
    MachineModuleInfo *MMI) const { … }

void TargetLoweringObjectFile::emitPersonalityValue(MCStreamer &Streamer,
                                                    const DataLayout &,
                                                    const MCSymbol *Sym) const { … }

void TargetLoweringObjectFile::emitCGProfileMetadata(MCStreamer &Streamer,
                                                     Module &M) const { … }

/// getKindForGlobal - This is a top-level target-independent classifier for
/// a global object.  Given a global variable and information from the TM, this
/// function classifies the global in a target independent manner. This function
/// may be overridden by the target implementation.
SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalObject *GO,
                                                       const TargetMachine &TM){ … }

/// This method computes the appropriate section to emit the specified global
/// variable or function definition.  This should not be passed external (or
/// available externally) globals.
MCSection *TargetLoweringObjectFile::SectionForGlobal(
    const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const { … }

/// This method computes the appropriate section to emit the specified global
/// variable or function definition. This should not be passed external (or
/// available externally) globals.
MCSection *
TargetLoweringObjectFile::SectionForGlobal(const GlobalObject *GO,
                                           const TargetMachine &TM) const { … }

MCSection *TargetLoweringObjectFile::getSectionForJumpTable(
    const Function &F, const TargetMachine &TM) const { … }

bool TargetLoweringObjectFile::shouldPutJumpTableInFunctionSection(
    bool UsesLabelDifference, const Function &F) const { … }

/// Given a mergable constant with the specified size and relocation
/// information, return a section that it should be placed in.
MCSection *TargetLoweringObjectFile::getSectionForConstant(
    const DataLayout &DL, SectionKind Kind, const Constant *C,
    Align &Alignment) const { … }

MCSection *TargetLoweringObjectFile::getSectionForMachineBasicBlock(
    const Function &F, const MachineBasicBlock &MBB,
    const TargetMachine &TM) const { … }

MCSection *TargetLoweringObjectFile::getUniqueSectionForFunction(
    const Function &F, const TargetMachine &TM) const { … }

/// getTTypeGlobalReference - Return an MCExpr to use for a
/// reference to the specified global variable from exception
/// handling information.
const MCExpr *TargetLoweringObjectFile::getTTypeGlobalReference(
    const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM,
    MachineModuleInfo *MMI, MCStreamer &Streamer) const { … }

const MCExpr *TargetLoweringObjectFile::
getTTypeReference(const MCSymbolRefExpr *Sym, unsigned Encoding,
                  MCStreamer &Streamer) const { … }

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

void TargetLoweringObjectFile::getNameWithPrefix(
    SmallVectorImpl<char> &OutName, const GlobalValue *GV,
    const TargetMachine &TM) const { … }