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 15 #include "mcld/Support/UniqueGCFactory.h" 16 #include "mcld/Support/MemoryArea.h" 17 #include "mcld/Support/Path.h" 18 #include <sys/stat.h> 19 #include <sys/types.h> 20 #include <fcntl.h> 21 22 namespace mcld 23 { 24 25 class RegionFactory; 26 /** \class MemoryAreaFactory 27 * \brief MemoryAreaFactory avoids creating duplicated MemoryAreas of the 28 * same file. 29 * 30 * Users can give duplicated input files on the command line. In order to 31 * prevent opening the same file twice, and create redundant MemoryRegions, 32 * mcld::Input should not create MemoryArea directly. Instead, it should ask 33 * MemoryAreaFactory and get the unique MemoryArea. 34 * 35 * The timing of opening and closing files is not strictly bound to the 36 * constructor and destructor of MCLDFile. For mcld::Output, MCLinker 37 * opens the file rather after assigning offset to sections. On the other 38 * aside, mcld::Input opens the file at constructor. In order to hide the 39 * file operations, MemoryAreaFactory actually open the file untill the first 40 * MemoryRegion is requested. 41 * 42 * @see MemoryRegion 43 * @see UniqueGCFactoryBase 44 */ 45 class MemoryAreaFactory : public UniqueGCFactoryBase<sys::fs::Path, MemoryArea, 0> 46 { 47 public: 48 explicit MemoryAreaFactory(size_t pNum); 49 ~MemoryAreaFactory(); 50 51 // produce - create a MemoryArea and open its file 52 // If the file fails to be opened, the returned MemoryArea::isMapped() 53 // should be false 54 MemoryArea* produce(const sys::fs::Path& pPath, int pFlags); 55 MemoryArea* produce(const sys::fs::Path& pPath, int pFlags, mode_t pMode); 56 57 private: 58 RegionFactory* m_pRegionFactory; 59 }; 60 61 } // namespace of mcld 62 63 #endif 64 65
