1 /*
   2  * Copyright (c) 2015, 2017, 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 SHARE_GC_Z_ZVIRTUALMEMORY_HPP
  25 #define SHARE_GC_Z_ZVIRTUALMEMORY_HPP
  26 
  27 #include "gc/z/zMemory.hpp"
  28 #include "memory/allocation.hpp"
  29 
  30 class ZVirtualMemory VALUE_OBJ_CLASS_SPEC {
  31 private:
  32   uintptr_t _start;
  33   uintptr_t _end;
  34 
  35 public:
  36   ZVirtualMemory();
  37   ZVirtualMemory(uintptr_t start, size_t size);
  38 
  39   bool is_null() const;
  40   uintptr_t start() const;
  41   uintptr_t end() const;
  42   size_t size() const;
  43   ZVirtualMemory split(size_t size);
  44   void clear();
  45 };
  46 
  47 class ZVirtualMemoryManager VALUE_OBJ_CLASS_SPEC {
  48 private:
  49   ZMemoryManager _manager;
  50   bool           _initialized;
  51 
  52   bool reserve(uintptr_t start, size_t size);
  53   void nmt_reserve(uintptr_t start, size_t size);
  54 
  55 public:
  56   ZVirtualMemoryManager();
  57 
  58   bool is_initialized() const;
  59 
  60   ZVirtualMemory alloc(size_t size, bool alloc_from_front = false);
  61   void free(ZVirtualMemory vmem);
  62 };
  63 
  64 #endif // SHARE_GC_Z_ZVIRTUALMEMORY_HPP