MemoryArea.h revision 283d8cbf5b3a6888c70f7931a54da9256e13d357 
1//===- MemoryArea.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_SUPPORT_MEMORYAREA_H
10#define MCLD_SUPPORT_MEMORYAREA_H
11
12#include <mcld/ADT/Uncopyable.h>
13
14#include <llvm/ADT/OwningPtr.h>
15#include <llvm/ADT/StringRef.h>
16#include <llvm/Support/MemoryBuffer.h>
17
18namespace mcld {
19
20/** \class MemoryArea
21 *  \brief MemoryArea is used to manage input read-only memory space.
22 */
23class MemoryArea : private Uncopyable
24{
25  friend class MemoryAreaFactory;
26public:
27  // constructor by file handler.
28  // If the given file handler is read-only, client can not request a region
29  // that out of the file size.
30  // @param pFileHandle - file handler
31  explicit MemoryArea(llvm::StringRef pFilename);
32
33  explicit MemoryArea(const char* pMemBuffer, size_t pSize);
34
35  // request - create a MemoryRegion within a sufficient space
36  // find an existing space to hold the MemoryRegion.
37  // if MemoryArea does not find such space, then it creates a new space and
38  // assign a MemoryRegion into the space.
39  llvm::StringRef request(size_t pOffset, size_t pLength);
40
41  size_t size() const;
42
43private:
44  std::unique_ptr<llvm::MemoryBuffer> m_pMemoryBuffer;
45};
46
47} // namespace of mcld
48
49#endif
50