1 /*
   2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 #ifndef OS_WINDOWS_GC_Z_ZBACKINGFILE_WINDOWS_HPP
  25 #define OS_WINDOWS_GC_Z_ZBACKINGFILE_WINDOWS_HPP
  26 
  27 #include "gc/z/zGranuleMap.hpp"
  28 #include "memory/allocation.hpp"
  29 
  30 #include <Windows.h>
  31 
  32 class ZBackingFile {
  33 private:
  34   ZGranuleMap<HANDLE> _handles;
  35   size_t              _size;
  36 
  37   HANDLE get_handle(uintptr_t offset) const;
  38   void put_handle(uintptr_t offset, HANDLE handle);
  39   void clear_handle(uintptr_t offset);
  40 
  41   size_t commit_from_paging_file(size_t offset, size_t size);
  42   size_t uncommit_from_paging_file(size_t offset, size_t size);
  43 
  44 public:
  45   ZBackingFile();
  46 
  47   size_t size() const;
  48 
  49   size_t commit(size_t offset, size_t length);
  50   size_t uncommit(size_t offset, size_t length);
  51 
  52   void map(uintptr_t addr, size_t size, size_t offset) const;
  53   void unmap(uintptr_t addr, size_t size) const;
  54 };
  55 
  56 #endif // OS_WINDOWS_GC_Z_ZBACKINGFILE_WINDOWS_HPP