1 //===- MemoryAreaFactory.h ------------------------------------------------===// 2 // 3 // The MCLinker Project 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 #ifndef MCLD_MEMORY_AREA_FACTORY_H 10 #define MCLD_MEMORY_AREA_FACTORY_H 11 #ifdef ENABLE_UNITTEST 12 #include <gtest.h> 13 #endif 14 #include <mcld/Support/GCFactory.h> 15 #include <mcld/Support/MemoryArea.h> 16 #include <mcld/Support/Path.h> 17 #include <mcld/Support/FileHandle.h> 18 #include <mcld/Support/HandleToArea.h> 19 20 namespace mcld 21 { 22 23 class RegionFactory; 24 /** \class MemoryAreaFactory 25 * \brief MemoryAreaFactory avoids creating duplicated MemoryAreas of the 26 * same file. 27 * 28 * Users can give duplicated input files on the command line. In order to 29 * prevent opening the same file twice, and create redundant MemoryRegions, 30 * mcld::Input should not create MemoryArea directly. Instead, it should ask 31 * MemoryAreaFactory and get the unique MemoryArea. 32 * 33 * The timing of opening and closing files is not strictly bound to the 34 * constructor and destructor of MCLDFile. For mcld::Output, MCLinker 35 * opens the file rather after assigning offset to sections. On the other 36 * aside, mcld::Input opens the file at constructor. In order to hide the 37 * file operations, MemoryAreaFactory actually open the file untill the first 38 * MemoryRegion is requested. 39 * 40 * @see MemoryRegion 41 */ 42 class MemoryAreaFactory : public GCFactory<MemoryArea, 0> 43 { 44 public: 45 explicit MemoryAreaFactory(size_t pNum); 46 47 virtual ~MemoryAreaFactory(); 48 49 // produce - create a MemoryArea and open its file. 50 MemoryArea* produce(const sys::fs::Path& pPath, 51 FileHandle::OpenMode pMode); 52 53 // produce - create a MemoryArea and open its file. 54 MemoryArea* produce(const sys::fs::Path& pPath, 55 FileHandle::OpenMode pMode, 56 FileHandle::Permission pPerm); 57 58 void destruct(MemoryArea* pArea); 59 60 protected: 61 // Create a MemoryArea with an universal space. 62 // The created MemoryArea is not moderated by m_HandleToArea. 63 MemoryArea* create(void* pMemBuffer, size_t pSize); 64 65 // Create a MemoryArea by the given file handler 66 MemoryArea* create(int pFD, FileHandle::OpenMode pMode); 67 68 private: 69 HandleToArea m_HandleToArea; 70 RegionFactory* m_pRegionFactory; 71 }; 72 73 } // namespace of mcld 74 75 #endif 76 77