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- //===- ObjectFile.cpp - File format independent object file ---------------===//
- //
- // 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 defines a file format independent ObjectFile class.
- //
- //===----------------------------------------------------------------------===//
- #include "llvm/Object/ObjectFile.h"
- #include "llvm/ADT/StringRef.h"
- #include "llvm/BinaryFormat/Magic.h"
- #include "llvm/Object/Binary.h"
- #include "llvm/Object/COFF.h"
- #include "llvm/Object/Error.h"
- #include "llvm/Object/MachO.h"
- #include "llvm/Object/Wasm.h"
- #include "llvm/Support/Error.h"
- #include "llvm/Support/ErrorHandling.h"
- #include "llvm/Support/ErrorOr.h"
- #include "llvm/Support/FileSystem.h"
- #include "llvm/Support/MemoryBuffer.h"
- #include "llvm/Support/raw_ostream.h"
- #include <algorithm>
- #include <cstdint>
- #include <memory>
- #include <system_error>
- using namespace llvm;
- using namespace object;
- raw_ostream &object::operator<<(raw_ostream &OS, const SectionedAddress &Addr) {
- OS << "SectionedAddress{" << format_hex(Addr.Address, 10);
- if (Addr.SectionIndex != SectionedAddress::UndefSection)
- OS << ", " << Addr.SectionIndex;
- return OS << "}";
- }
- void ObjectFile::anchor() {}
- ObjectFile::ObjectFile(unsigned int Type, MemoryBufferRef Source)
- : SymbolicFile(Type, Source) {}
- bool SectionRef::containsSymbol(SymbolRef S) const {
- Expected<section_iterator> SymSec = S.getSection();
- if (!SymSec) {
- // TODO: Actually report errors helpfully.
- consumeError(SymSec.takeError());
- return false;
- }
- return *this == **SymSec;
- }
- Expected<uint64_t> ObjectFile::getSymbolValue(DataRefImpl Ref) const {
- uint32_t Flags;
- if (Error E = getSymbolFlags(Ref).moveInto(Flags))
- // TODO: Test this error.
- return std::move(E);
- if (Flags & SymbolRef::SF_Undefined)
- return 0;
- if (Flags & SymbolRef::SF_Common)
- return getCommonSymbolSize(Ref);
- return getSymbolValueImpl(Ref);
- }
- Error ObjectFile::printSymbolName(raw_ostream &OS, DataRefImpl Symb) const {
- Expected<StringRef> Name = getSymbolName(Symb);
- if (!Name)
- return Name.takeError();
- OS << *Name;
- return Error::success();
- }
- uint32_t ObjectFile::getSymbolAlignment(DataRefImpl DRI) const { return 0; }
- bool ObjectFile::isSectionBitcode(DataRefImpl Sec) const {
- Expected<StringRef> NameOrErr = getSectionName(Sec);
- if (NameOrErr)
- return *NameOrErr == ".llvmbc";
- consumeError(NameOrErr.takeError());
- return false;
- }
- bool ObjectFile::isSectionStripped(DataRefImpl Sec) const { return false; }
- bool ObjectFile::isBerkeleyText(DataRefImpl Sec) const {
- return isSectionText(Sec);
- }
- bool ObjectFile::isBerkeleyData(DataRefImpl Sec) const {
- return isSectionData(Sec);
- }
- bool ObjectFile::isDebugSection(DataRefImpl Sec) const { return false; }
- Expected<section_iterator>
- ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
- return section_iterator(SectionRef(Sec, this));
- }
- Triple ObjectFile::makeTriple() const {
- Triple TheTriple;
- auto Arch = getArch();
- TheTriple.setArch(Triple::ArchType(Arch));
- // For ARM targets, try to use the build attributes to build determine
- // the build target. Target features are also added, but later during
- // disassembly.
- if (Arch == Triple::arm || Arch == Triple::armeb)
- setARMSubArch(TheTriple);
- // TheTriple defaults to ELF, and COFF doesn't have an environment:
- // something we can do here is indicate that it is mach-o.
- if (isMachO()) {
- TheTriple.setObjectFormat(Triple::MachO);
- } else if (isCOFF()) {
- const auto COFFObj = cast<COFFObjectFile>(this);
- if (COFFObj->getArch() == Triple::thumb)
- TheTriple.setTriple("thumbv7-windows");
- } else if (isXCOFF()) {
- // XCOFF implies AIX.
- TheTriple.setOS(Triple::AIX);
- TheTriple.setObjectFormat(Triple::XCOFF);
- }
- return TheTriple;
- }
- Expected<std::unique_ptr<ObjectFile>>
- ObjectFile::createObjectFile(MemoryBufferRef Object, file_magic Type,
- bool InitContent) {
- StringRef Data = Object.getBuffer();
- if (Type == file_magic::unknown)
- Type = identify_magic(Data);
- switch (Type) {
- case file_magic::unknown:
- case file_magic::bitcode:
- case file_magic::coff_cl_gl_object:
- case file_magic::archive:
- case file_magic::macho_universal_binary:
- case file_magic::windows_resource:
- case file_magic::pdb:
- case file_magic::minidump:
- case file_magic::goff_object:
- return errorCodeToError(object_error::invalid_file_type);
- case file_magic::tapi_file:
- return errorCodeToError(object_error::invalid_file_type);
- case file_magic::elf:
- case file_magic::elf_relocatable:
- case file_magic::elf_executable:
- case file_magic::elf_shared_object:
- case file_magic::elf_core:
- return createELFObjectFile(Object, InitContent);
- case file_magic::macho_object:
- case file_magic::macho_executable:
- case file_magic::macho_fixed_virtual_memory_shared_lib:
- case file_magic::macho_core:
- case file_magic::macho_preload_executable:
- case file_magic::macho_dynamically_linked_shared_lib:
- case file_magic::macho_dynamic_linker:
- case file_magic::macho_bundle:
- case file_magic::macho_dynamically_linked_shared_lib_stub:
- case file_magic::macho_dsym_companion:
- case file_magic::macho_kext_bundle:
- return createMachOObjectFile(Object);
- case file_magic::coff_object:
- case file_magic::coff_import_library:
- case file_magic::pecoff_executable:
- return createCOFFObjectFile(Object);
- case file_magic::xcoff_object_32:
- return createXCOFFObjectFile(Object, Binary::ID_XCOFF32);
- case file_magic::xcoff_object_64:
- return createXCOFFObjectFile(Object, Binary::ID_XCOFF64);
- case file_magic::wasm_object:
- return createWasmObjectFile(Object);
- }
- llvm_unreachable("Unexpected Object File Type");
- }
- Expected<OwningBinary<ObjectFile>>
- ObjectFile::createObjectFile(StringRef ObjectPath) {
- ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
- MemoryBuffer::getFile(ObjectPath);
- if (std::error_code EC = FileOrErr.getError())
- return errorCodeToError(EC);
- std::unique_ptr<MemoryBuffer> Buffer = std::move(FileOrErr.get());
- Expected<std::unique_ptr<ObjectFile>> ObjOrErr =
- createObjectFile(Buffer->getMemBufferRef());
- if (Error Err = ObjOrErr.takeError())
- return std::move(Err);
- std::unique_ptr<ObjectFile> Obj = std::move(ObjOrErr.get());
- return OwningBinary<ObjectFile>(std::move(Obj), std::move(Buffer));
- }
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