1 /*

     2  * Copyright (c) 2018, 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 

    25 #ifndef SHARE_MEMORY_METASPACE_CHUNKMANAGER_HPP

    26 #define SHARE_MEMORY_METASPACE_CHUNKMANAGER_HPP

    27 

    28 #include "memory/allocation.hpp"

    29 #include "memory/metaspace/metaspaceCommon.hpp"

    30 #include "memory/metaspace/spaceManager.hpp"

    31 

    32 namespace metaspace {

    33 

    34 

    35 class ClassLoaderMetaspace : public CHeapObj<mtClass> {

    36 

    37   // The CLD lock.

    38   Mutex* const _lock;

    39 

    40   const Metaspace::MetaspaceType _space_type;

    41 

    42   metaspace::SpaceManager* _non_class_space_manager;

    43   metaspace::SpaceManager* _class_space_manager;

    44 

    45   Mutex* lock() const                                       { return _lock; }

    46   metaspace::SpaceManager* non_class_space_manager() const  { return _non_class_space_manager; }

    47   metaspace::SpaceManager* class_space_manager() const      { return _class_space_manager; }

    48 

    49   metaspace::SpaceManager* get_space_manager(bool is_class) {

    50     return is_class ? class_space_manager() : non_class_space_manager();

    51   }

    52 

    53 public:

    54 

    55   ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType space_type);

    56 

    57   ~ClassLoaderMetaspace();

    58 

    59   // Allocate word_size words from Metaspace.

    60   MetaWord* allocate(size_t word_size, bool is_class);

    61 

    62   // Attempt to expand the GC threshold to be good for at least another word_size words

    63   // and allocate. Returns NULL if failure. Used during Metaspace GC.

    64   MetaWord* expand_GC_threshold_and_allocate(size_t word_size, bool is_class);

    65 

    66   // Prematurely returns a metaspace allocation to the _block_freelists

    67   // because it is not needed anymore.

    68   void deallocate(MetaWord* ptr, size_t word_size, bool is_class);

    69 

    70 

    71   DEBUG_ONLY(void verify(bool slow) const;)

    72 

    73 };

    74 

    75 } // namespace metaspace

    76 

    77 #endif // SHARE_MEMORY_METASPACE_CHUNKMANAGER_HPP