llvm/lld/ELF/EhFrame.cpp

//===- EhFrame.cpp -------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// .eh_frame section contains information on how to unwind the stack when
// an exception is thrown. The section consists of sequence of CIE and FDE
// records. The linker needs to merge CIEs and associate FDEs to CIEs.
// That means the linker has to understand the format of the section.
//
// This file contains a few utility functions to read .eh_frame contents.
//
//===----------------------------------------------------------------------===//

#include "EhFrame.h"
#include "Config.h"
#include "InputSection.h"
#include "Relocations.h"
#include "Target.h"
#include "lld/Common/ErrorHandler.h"
#include "lld/Common/Strings.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/Object/ELF.h"

usingnamespacellvm;
usingnamespacellvm::ELF;
usingnamespacellvm::dwarf;
usingnamespacellvm::object;
usingnamespacelld;
usingnamespacelld::elf;

namespace {
class EhReader { … };
}

// Read a byte and advance D by one byte.
uint8_t EhReader::readByte() { … }

void EhReader::skipBytes(size_t count) { … }

// Read a null-terminated string.
StringRef EhReader::readString() { … }

// Skip an integer encoded in the LEB128 format.
// Actual number is not of interest because only the runtime needs it.
// But we need to be at least able to skip it so that we can read
// the field that follows a LEB128 number.
void EhReader::skipLeb128() { … }

static size_t getAugPSize(Ctx &ctx, unsigned enc) { … }

void EhReader::skipAugP() { … }

uint8_t elf::getFdeEncoding(EhSectionPiece *p) { … }

bool elf::hasLSDA(const EhSectionPiece &p) { … }

StringRef EhReader::getAugmentation() { … }

uint8_t EhReader::getFdeEncoding() { … }

bool EhReader::hasLSDA() { … }