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//===- lib/ReaderWriter/ELF/Chunks.h --------------------------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLD_READER_WRITER_ELF_CHUNKS_H
#define LLD_READER_WRITER_ELF_CHUNKS_H
#include "lld/Core/LLVM.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Object/ELF.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FileOutputBuffer.h"
namespace lld {
class ELFLinkingContext;
namespace elf {
class ELFWriter;
/// \brief A chunk is a contiguous region of space
template<class ELFT>
class Chunk {
public:
/// \brief Describes the type of Chunk
enum Kind {
K_Header, ///< ELF Header
K_ProgramHeader, ///< Program Header
K_ELFSegment, ///< Segment
K_ELFSection, ///< Section
K_AtomSection, ///< A section containing atoms.
K_SectionHeader ///< Section header
};
/// \brief the ContentType of the chunk
enum ContentType {
CT_Unknown,
CT_Header,
CT_Code,
CT_Data,
CT_Note,
CT_Tls,
};
Chunk(StringRef name, Kind kind, const ELFLinkingContext &context)
: _name(name), _kind(kind), _fsize(0), _msize(0), _align2(0), _order(0),
_ordinal(1), _start(0), _fileoffset(0), _context(context) {}
virtual ~Chunk() {}
// Does the chunk occupy disk space
virtual bool occupiesNoDiskSpace() const { return false; }
// The name of the chunk
StringRef name() const { return _name; }
// Kind of chunk
Kind kind() const { return _kind; }
uint64_t fileSize() const { return _fsize; }
uint64_t align2() const { return _align2; }
// The ordinal value of the chunk
uint64_t ordinal() const { return _ordinal;}
void setOrdinal(uint64_t newVal) { _ordinal = newVal;}
// The order in which the chunk would appear in the output file
uint64_t order() const { return _order; }
void setOrder(uint32_t order) { _order = order; }
// Output file offset of the chunk
uint64_t fileOffset() const { return _fileoffset; }
void setFileOffset(uint64_t offset) { _fileoffset = offset; }
// Output start address of the chunk
void setVAddr(uint64_t start) { _start = start; }
uint64_t virtualAddr() const { return _start; }
// Does the chunk occupy memory during execution ?
uint64_t memSize() const { return _msize; }
void setMemSize(uint64_t msize) { _msize = msize; }
// Whats the contentType of the chunk ?
virtual int getContentType() const = 0;
// Writer the chunk
virtual void write(ELFWriter *writer, llvm::FileOutputBuffer &buffer) = 0;
// Finalize the chunk before assigning offsets/virtual addresses
virtual void doPreFlight() = 0;
// Finalize the chunk before writing
virtual void finalize() = 0;
protected:
StringRef _name;
Kind _kind;
uint64_t _fsize;
uint64_t _msize;
uint64_t _align2;
uint32_t _order;
uint64_t _ordinal;
uint64_t _start;
uint64_t _fileoffset;
const ELFLinkingContext &_context;
};
} // end namespace elf
} // end namespace lld
#endif
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