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//===- ObjectFile.h - File format independent object file -------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file declares a file format independent ObjectFile class.
#include "llvm/ADT/StringRef.h"
#include "llvm/Object/SymbolicFile.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include <cstring>
#include <vector>
namespace llvm {
namespace object {
class ObjectFile;
class COFFObjectFile;
class MachOObjectFile;
class SymbolRef;
class symbol_iterator;
class SectionRef;
typedef content_iterator<SectionRef> section_iterator;
/// This is a value type class that represents a single relocation in the list
/// of relocations in the object file.
class RelocationRef {
DataRefImpl RelocationPimpl;
const ObjectFile *OwningObject;
RelocationRef() : OwningObject(nullptr) { }
RelocationRef(DataRefImpl RelocationP, const ObjectFile *Owner);
bool operator==(const RelocationRef &Other) const;
void moveNext();
uint64_t getOffset() const;
symbol_iterator getSymbol() const;
uint64_t getType() const;
/// @brief Get a string that represents the type of this relocation.
/// This is for display purposes only.
void getTypeName(SmallVectorImpl<char> &Result) const;
DataRefImpl getRawDataRefImpl() const;
const ObjectFile *getObject() const;
typedef content_iterator<RelocationRef> relocation_iterator;
/// This is a value type class that represents a single section in the list of
/// sections in the object file.
class SectionRef {
friend class SymbolRef;
DataRefImpl SectionPimpl;
const ObjectFile *OwningObject;
SectionRef() : OwningObject(nullptr) { }
SectionRef(DataRefImpl SectionP, const ObjectFile *Owner);
bool operator==(const SectionRef &Other) const;
bool operator!=(const SectionRef &Other) const;
bool operator<(const SectionRef &Other) const;
void moveNext();
std::error_code getName(StringRef &Result) const;
uint64_t getAddress() const;
uint64_t getSize() const;
std::error_code getContents(StringRef &Result) const;
/// @brief Get the alignment of this section as the actual value (not log 2).
uint64_t getAlignment() const;
bool isText() const;
bool isData() const;
bool isBSS() const;
bool isVirtual() const;
bool containsSymbol(SymbolRef S) const;
relocation_iterator relocation_begin() const;
relocation_iterator relocation_end() const;
iterator_range<relocation_iterator> relocations() const {
return iterator_range<relocation_iterator>(relocation_begin(),
section_iterator getRelocatedSection() const;
DataRefImpl getRawDataRefImpl() const;
const ObjectFile *getObject() const;
/// This is a value type class that represents a single symbol in the list of
/// symbols in the object file.
class SymbolRef : public BasicSymbolRef {
friend class SectionRef;
SymbolRef() : BasicSymbolRef() {}
enum Type {
ST_Unknown, // Type not specified
SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner);
SymbolRef(const BasicSymbolRef &B) : BasicSymbolRef(B) {
ErrorOr<StringRef> getName() const;
/// Returns the symbol virtual address (i.e. address at which it will be
/// mapped).
ErrorOr<uint64_t> getAddress() const;
/// Return the value of the symbol depending on the object this can be an
/// offset or a virtual address.
uint64_t getValue() const;
/// @brief Get the alignment of this symbol as the actual value (not log 2).
uint32_t getAlignment() const;
uint64_t getCommonSize() const;
SymbolRef::Type getType() const;
/// @brief Get section this symbol is defined in reference to. Result is
/// end_sections() if it is undefined or is an absolute symbol.
std::error_code getSection(section_iterator &Result) const;
const ObjectFile *getObject() const;
class symbol_iterator : public basic_symbol_iterator {
symbol_iterator(SymbolRef Sym) : basic_symbol_iterator(Sym) {}
symbol_iterator(const basic_symbol_iterator &B)
: basic_symbol_iterator(SymbolRef(B->getRawDataRefImpl(),
cast<ObjectFile>(B->getObject()))) {}
const SymbolRef *operator->() const {
const BasicSymbolRef &P = basic_symbol_iterator::operator *();
return static_cast<const SymbolRef*>(&P);
const SymbolRef &operator*() const {
const BasicSymbolRef &P = basic_symbol_iterator::operator *();
return static_cast<const SymbolRef&>(P);
/// This class is the base class for all object file types. Concrete instances
/// of this object are created by createObjectFile, which figures out which type
/// to create.
class ObjectFile : public SymbolicFile {
virtual void anchor();
ObjectFile() = delete;
ObjectFile(const ObjectFile &other) = delete;
ObjectFile(unsigned int Type, MemoryBufferRef Source);
const uint8_t *base() const {
return reinterpret_cast<const uint8_t *>(Data.getBufferStart());
// These functions are for SymbolRef to call internally. The main goal of
// this is to allow SymbolRef::SymbolPimpl to point directly to the symbol
// entry in the memory mapped object file. SymbolPimpl cannot contain any
// virtual functions because then it could not point into the memory mapped
// file.
// Implementations assume that the DataRefImpl is valid and has not been
// modified externally. It's UB otherwise.
friend class SymbolRef;
virtual ErrorOr<StringRef> getSymbolName(DataRefImpl Symb) const = 0;
std::error_code printSymbolName(raw_ostream &OS,
DataRefImpl Symb) const override;
virtual ErrorOr<uint64_t> getSymbolAddress(DataRefImpl Symb) const = 0;
virtual uint64_t getSymbolValueImpl(DataRefImpl Symb) const = 0;
virtual uint32_t getSymbolAlignment(DataRefImpl Symb) const;
virtual uint64_t getCommonSymbolSizeImpl(DataRefImpl Symb) const = 0;
virtual SymbolRef::Type getSymbolType(DataRefImpl Symb) const = 0;
virtual std::error_code getSymbolSection(DataRefImpl Symb,
section_iterator &Res) const = 0;
// Same as above for SectionRef.
friend class SectionRef;
virtual void moveSectionNext(DataRefImpl &Sec) const = 0;
virtual std::error_code getSectionName(DataRefImpl Sec,
StringRef &Res) const = 0;
virtual uint64_t getSectionAddress(DataRefImpl Sec) const = 0;
virtual uint64_t getSectionSize(DataRefImpl Sec) const = 0;
virtual std::error_code getSectionContents(DataRefImpl Sec,
StringRef &Res) const = 0;
virtual uint64_t getSectionAlignment(DataRefImpl Sec) const = 0;
virtual bool isSectionText(DataRefImpl Sec) const = 0;
virtual bool isSectionData(DataRefImpl Sec) const = 0;
virtual bool isSectionBSS(DataRefImpl Sec) const = 0;
// A section is 'virtual' if its contents aren't present in the object image.
virtual bool isSectionVirtual(DataRefImpl Sec) const = 0;
virtual relocation_iterator section_rel_begin(DataRefImpl Sec) const = 0;
virtual relocation_iterator section_rel_end(DataRefImpl Sec) const = 0;
virtual section_iterator getRelocatedSection(DataRefImpl Sec) const;
// Same as above for RelocationRef.
friend class RelocationRef;
virtual void moveRelocationNext(DataRefImpl &Rel) const = 0;
virtual uint64_t getRelocationOffset(DataRefImpl Rel) const = 0;
virtual symbol_iterator getRelocationSymbol(DataRefImpl Rel) const = 0;
virtual uint64_t getRelocationType(DataRefImpl Rel) const = 0;
virtual void getRelocationTypeName(DataRefImpl Rel,
SmallVectorImpl<char> &Result) const = 0;
uint64_t getSymbolValue(DataRefImpl Symb) const;
uint64_t getCommonSymbolSize(DataRefImpl Symb) const {
assert(getSymbolFlags(Symb) & SymbolRef::SF_Common);
return getCommonSymbolSizeImpl(Symb);
typedef iterator_range<symbol_iterator> symbol_iterator_range;
symbol_iterator_range symbols() const {
return symbol_iterator_range(symbol_begin(), symbol_end());
virtual section_iterator section_begin() const = 0;
virtual section_iterator section_end() const = 0;
typedef iterator_range<section_iterator> section_iterator_range;
section_iterator_range sections() const {
return section_iterator_range(section_begin(), section_end());
/// @brief The number of bytes used to represent an address in this object
/// file format.
virtual uint8_t getBytesInAddress() const = 0;
virtual StringRef getFileFormatName() const = 0;
virtual /* Triple::ArchType */ unsigned getArch() const = 0;
/// Returns platform-specific object flags, if any.
virtual std::error_code getPlatformFlags(unsigned &Result) const {
Result = 0;
return object_error::invalid_file_type;
/// True if this is a relocatable object (.o/.obj).
virtual bool isRelocatableObject() const = 0;
/// @returns Pointer to ObjectFile subclass to handle this type of object.
/// @param ObjectPath The path to the object file. ObjectPath.isObject must
/// return true.
/// @brief Create ObjectFile from path.
static ErrorOr<OwningBinary<ObjectFile>>
createObjectFile(StringRef ObjectPath);
static ErrorOr<std::unique_ptr<ObjectFile>>
createObjectFile(MemoryBufferRef Object, sys::fs::file_magic Type);
static ErrorOr<std::unique_ptr<ObjectFile>>
createObjectFile(MemoryBufferRef Object) {
return createObjectFile(Object, sys::fs::file_magic::unknown);
static inline bool classof(const Binary *v) {
return v->isObject();
static ErrorOr<std::unique_ptr<COFFObjectFile>>
createCOFFObjectFile(MemoryBufferRef Object);
static ErrorOr<std::unique_ptr<ObjectFile>>
createELFObjectFile(MemoryBufferRef Object);
static ErrorOr<std::unique_ptr<MachOObjectFile>>
createMachOObjectFile(MemoryBufferRef Object);
// Inline function definitions.
inline SymbolRef::SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner)
: BasicSymbolRef(SymbolP, Owner) {}
inline ErrorOr<StringRef> SymbolRef::getName() const {
return getObject()->getSymbolName(getRawDataRefImpl());
inline ErrorOr<uint64_t> SymbolRef::getAddress() const {
return getObject()->getSymbolAddress(getRawDataRefImpl());
inline uint64_t SymbolRef::getValue() const {
return getObject()->getSymbolValue(getRawDataRefImpl());
inline uint32_t SymbolRef::getAlignment() const {
return getObject()->getSymbolAlignment(getRawDataRefImpl());
inline uint64_t SymbolRef::getCommonSize() const {
return getObject()->getCommonSymbolSize(getRawDataRefImpl());
inline std::error_code SymbolRef::getSection(section_iterator &Result) const {
return getObject()->getSymbolSection(getRawDataRefImpl(), Result);
inline SymbolRef::Type SymbolRef::getType() const {
return getObject()->getSymbolType(getRawDataRefImpl());
inline const ObjectFile *SymbolRef::getObject() const {
const SymbolicFile *O = BasicSymbolRef::getObject();
return cast<ObjectFile>(O);
/// SectionRef
inline SectionRef::SectionRef(DataRefImpl SectionP,
const ObjectFile *Owner)
: SectionPimpl(SectionP)
, OwningObject(Owner) {}
inline bool SectionRef::operator==(const SectionRef &Other) const {
return SectionPimpl == Other.SectionPimpl;
inline bool SectionRef::operator!=(const SectionRef &Other) const {
return SectionPimpl != Other.SectionPimpl;
inline bool SectionRef::operator<(const SectionRef &Other) const {
return SectionPimpl < Other.SectionPimpl;
inline void SectionRef::moveNext() {
return OwningObject->moveSectionNext(SectionPimpl);
inline std::error_code SectionRef::getName(StringRef &Result) const {
return OwningObject->getSectionName(SectionPimpl, Result);
inline uint64_t SectionRef::getAddress() const {
return OwningObject->getSectionAddress(SectionPimpl);
inline uint64_t SectionRef::getSize() const {
return OwningObject->getSectionSize(SectionPimpl);
inline std::error_code SectionRef::getContents(StringRef &Result) const {
return OwningObject->getSectionContents(SectionPimpl, Result);
inline uint64_t SectionRef::getAlignment() const {
return OwningObject->getSectionAlignment(SectionPimpl);
inline bool SectionRef::isText() const {
return OwningObject->isSectionText(SectionPimpl);
inline bool SectionRef::isData() const {
return OwningObject->isSectionData(SectionPimpl);
inline bool SectionRef::isBSS() const {
return OwningObject->isSectionBSS(SectionPimpl);
inline bool SectionRef::isVirtual() const {
return OwningObject->isSectionVirtual(SectionPimpl);
inline relocation_iterator SectionRef::relocation_begin() const {
return OwningObject->section_rel_begin(SectionPimpl);
inline relocation_iterator SectionRef::relocation_end() const {
return OwningObject->section_rel_end(SectionPimpl);
inline section_iterator SectionRef::getRelocatedSection() const {
return OwningObject->getRelocatedSection(SectionPimpl);
inline DataRefImpl SectionRef::getRawDataRefImpl() const {
return SectionPimpl;
inline const ObjectFile *SectionRef::getObject() const {
return OwningObject;
/// RelocationRef
inline RelocationRef::RelocationRef(DataRefImpl RelocationP,
const ObjectFile *Owner)
: RelocationPimpl(RelocationP)
, OwningObject(Owner) {}
inline bool RelocationRef::operator==(const RelocationRef &Other) const {
return RelocationPimpl == Other.RelocationPimpl;
inline void RelocationRef::moveNext() {
return OwningObject->moveRelocationNext(RelocationPimpl);
inline uint64_t RelocationRef::getOffset() const {
return OwningObject->getRelocationOffset(RelocationPimpl);
inline symbol_iterator RelocationRef::getSymbol() const {
return OwningObject->getRelocationSymbol(RelocationPimpl);
inline uint64_t RelocationRef::getType() const {
return OwningObject->getRelocationType(RelocationPimpl);
inline void RelocationRef::getTypeName(SmallVectorImpl<char> &Result) const {
return OwningObject->getRelocationTypeName(RelocationPimpl, Result);
inline DataRefImpl RelocationRef::getRawDataRefImpl() const {
return RelocationPimpl;
inline const ObjectFile *RelocationRef::getObject() const {
return OwningObject;
} // end namespace object
} // end namespace llvm