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94 lines
2.6 KiB
94 lines
2.6 KiB
7 months ago
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//===- FragmentRef.h ------------------------------------------------------===//
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//
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// The MCLinker Project
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef MCLD_FRAGMENT_FRAGMENTREF_H_
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#define MCLD_FRAGMENT_FRAGMENTREF_H_
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#include "mcld/ADT/SizeTraits.h"
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#include "mcld/ADT/TypeTraits.h"
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#include "mcld/Config/Config.h"
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#include "mcld/Support/Allocators.h"
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namespace mcld {
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class Fragment;
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class LDSection;
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class Layout;
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/** \class FragmentRef
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* \brief FragmentRef is a reference of a Fragment's contetnt.
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*
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*/
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class FragmentRef {
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public:
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typedef uint64_t Offset; // FIXME: use SizeTraits<T>::Offset
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typedef NonConstTraits<unsigned char>::pointer Address;
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typedef ConstTraits<unsigned char>::pointer ConstAddress;
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public:
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/// Create - create a fragment reference for a given fragment.
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///
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/// @param pFrag - the given fragment
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/// @param pOffset - the offset, can be larger than the fragment, but can not
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/// be larger than the section size.
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/// @return if the offset is legal, return the fragment reference. Otherwise,
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/// return NULL.
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static FragmentRef* Create(Fragment& pFrag, uint64_t pOffset);
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static FragmentRef* Create(LDSection& pSection, uint64_t pOffset);
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/// Clear - clear all generated FragmentRef in the system.
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static void Clear();
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static FragmentRef* Null();
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// ----- modifiers ----- //
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FragmentRef& assign(const FragmentRef& pCopy);
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FragmentRef& assign(Fragment& pFrag, Offset pOffset = 0);
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/// memcpy - copy memory
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/// copy memory from the fragment to the pDesc.
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/// @pDest - the destination address
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/// @pNBytes - copies pNBytes from the fragment[offset()+pOffset]
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/// @pOffset - additional offset.
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/// the start address offset from fragment[offset()]
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void memcpy(void* pDest, size_t pNBytes, Offset pOffset = 0) const;
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// ----- observers ----- //
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bool isNull() const { return (this == Null()); }
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Fragment* frag() { return m_pFragment; }
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const Fragment* frag() const { return m_pFragment; }
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Offset offset() const { return m_Offset; }
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Offset getOutputOffset() const;
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private:
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friend FragmentRef& NullFragmentRef();
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friend class Chunk<FragmentRef, MCLD_SECTIONS_PER_INPUT>;
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friend class Relocation;
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FragmentRef();
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explicit FragmentRef(Fragment& pFrag, Offset pOffset = 0);
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private:
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Fragment* m_pFragment;
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Offset m_Offset;
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static FragmentRef g_NullFragmentRef;
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};
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} // namespace mcld
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#endif // MCLD_FRAGMENT_FRAGMENTREF_H_
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