1 /*

     2  * Copyright (c) 2015, 2018, 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 {

    31   friend class VMStructs;

    32 

    33 private:

    34   uintptr_t _start;

    35   uintptr_t _end;

    36 

    37 public:

    38   ZVirtualMemory();

    39   ZVirtualMemory(uintptr_t start, size_t size);

    40 

    41   bool is_null() const;

    42   uintptr_t start() const;

    43   uintptr_t end() const;

    44   size_t size() const;

    45   ZVirtualMemory split(size_t size);

    46   void clear();

    47 };

    48 

    49 class ZVirtualMemoryManager {

    50 private:

    51   ZMemoryManager _manager;

    52   bool           _initialized;

    53 

    54   bool reserve(uintptr_t start, size_t size);

    55   void nmt_reserve(uintptr_t start, size_t size);

    56 

    57 public:

    58   ZVirtualMemoryManager();

    59 

    60   bool is_initialized() const;

    61 

    62   ZVirtualMemory alloc(size_t size, bool alloc_from_front = false);

    63   void free(ZVirtualMemory vmem);

    64 };

    65 

    66 #endif // SHARE_GC_Z_ZVIRTUALMEMORY_HPP