//===- MemoryRegion.h -----------------------------------------------------===// // // The MCLinker Project // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// #ifndef LD_MEMORY_REGION_H #define LD_MEMORY_REGION_H #ifdef ENABLE_UNITTEST #include <gtest.h> #endif #include <mcld/ADT/Uncopyable.h> #include <mcld/Support/FileSystem.h> #include <mcld/Support/MemoryArea.h> #include <mcld/Support/Space.h> namespace mcld { /** \class MemoryRegion * \brief MemoryRegion is a range of virtual memory which is mapped onto a * range of files which is opened by MemoryArea. * * MemoryArea maps a file onto virtual memory. Clients can get a range of * mapped memory space by requesting a MemoryRegion from MemoryArea, and * read/write the mapped file through the MemoryRegion. * * When two different MemoryRegion may overlap memory space, race condition * may occurs. Clients must call MemoryRegion::sync() explicit to tell the * MemoryArea when to synchronize the virtual memory space with the mapped * file. */ class MemoryRegion : private Uncopyable { friend class RegionFactory; friend class MemoryArea; public: typedef Space::Address Address; typedef Space::ConstAddress ConstAddress; private: MemoryRegion(Space& pParent, const Address pVMAStart, size_t pSize); Space* parent() { return &m_Parent; } const Space* parent() const { return &m_Parent; } public: ~MemoryRegion(); Address start() { return m_VMAStart; } ConstAddress start() const { return m_VMAStart; } Address end() { return m_VMAStart+m_Length; } ConstAddress end() const { return m_VMAStart+m_Length; } size_t size() const { return m_Length; } Address getBuffer(size_t pOffset = 0) { return m_VMAStart+pOffset; } ConstAddress getBuffer(size_t pOffset = 0) const { return m_VMAStart+pOffset; } private: Space& m_Parent; Address m_VMAStart; size_t m_Length; }; } // namespace of mcld #endif