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//===- ELFReader.h --------------------------------------------------------===//
//
// The MCLinker Project
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef MCLD_ELF_READER_INTERFACE_H
#define MCLD_ELF_READER_INTERFACE_H
#ifdef ENABLE_UNITTEST
#include <gtest.h>
#endif
#include <llvm/ADT/StringRef.h>
#include <llvm/Support/ELF.h>
#include <llvm/Support/Host.h>
#include <mcld/Module.h>
#include <mcld/LinkerConfig.h>
#include <mcld/LD/LDContext.h>
#include <mcld/Target/GNULDBackend.h>
#include <mcld/Support/MsgHandling.h>
namespace mcld {
class Module;
class IRBuilder;
class FragmentRef;
class SectionData;
class LDSection;
/** \class ELFReaderIF
* \brief ELFReaderIF provides common interface for all kind of ELF readers.
*/
class ELFReaderIF
{
public:
ELFReaderIF(GNULDBackend& pBackend)
: m_Backend(pBackend)
{ }
virtual ~ELFReaderIF() { }
/// ELFHeaderSize - return the size of the ELFHeader
virtual size_t getELFHeaderSize() const = 0;
/// isELF - is this a ELF file
virtual bool isELF(void* pELFHeader) const = 0;
/// isMyEndian - is this ELF file in the same endian to me?
virtual bool isMyEndian(void* pELFHeader) const = 0;
/// isMyMachine - is this ELF file generated for the same machine.
virtual bool isMyMachine(void* pELFHeader) const = 0;
/// fileType - the file type of this file
virtual Input::Type fileType(void* pELFHeader) const = 0;
/// target - the target backend
const GNULDBackend& target() const { return m_Backend; }
GNULDBackend& target() { return m_Backend; }
/// readSectionHeaders - read ELF section header table and create LDSections
virtual bool readSectionHeaders(Input& pInput, void* pELFHeader) const = 0;
/// readRegularSection - read a regular section and create fragments.
virtual bool readRegularSection(Input& pInput, SectionData& pSD) const = 0;
/// readSymbols - read ELF symbols and create LDSymbol
virtual bool readSymbols(Input& pInput,
IRBuilder& pBuilder,
const MemoryRegion& pRegion,
const char* StrTab) const = 0;
/// readSignature - read a symbol from the given Input and index in symtab
/// This is used to get the signature of a group section.
virtual ResolveInfo* readSignature(Input& pInput,
LDSection& pSymTab,
uint32_t pSymIdx) const = 0;
/// readRela - read ELF rela and create Relocation
virtual bool readRela(Input& pInput,
LDSection& pSection,
const MemoryRegion& pRegion) const = 0;
/// readRel - read ELF rel and create Relocation
virtual bool readRel(Input& pInput,
LDSection& pSection,
const MemoryRegion& pRegion) const = 0;
/// readDynamic - read ELF .dynamic in input dynobj
virtual bool readDynamic(Input& pInput) const = 0;
protected:
/// LinkInfo - some section needs sh_link and sh_info, remember them.
struct LinkInfo {
LDSection* section;
uint32_t sh_link;
uint32_t sh_info;
};
typedef std::vector<LinkInfo> LinkInfoList;
protected:
ResolveInfo::Type getSymType(uint8_t pInfo, uint16_t pShndx) const;
ResolveInfo::Desc getSymDesc(uint16_t pShndx, const Input& pInput) const;
ResolveInfo::Binding getSymBinding(uint8_t pBinding,
uint16_t pShndx,
uint8_t pVisibility) const;
uint64_t getSymValue(uint64_t pValue,
uint16_t pShndx,
const Input& pInput) const;
FragmentRef* getSymFragmentRef(Input& pInput,
uint16_t pShndx,
uint32_t pOffset) const;
ResolveInfo::Visibility getSymVisibility(uint8_t pVis) const;
protected:
GNULDBackend& m_Backend;
};
} // namespace of mcld
#endif
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