1 /*

     2  * Copyright (c) 2018, 2019, SAP SE. All rights reserved.

     3  * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.

     4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     5  *

     6  * This code is free software; you can redistribute it and/or modify it

     7  * under the terms of the GNU General Public License version 2 only, as

     8  * published by the Free Software Foundation.

     9  *

    10  * This code is distributed in the hope that it will be useful, but WITHOUT

    11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    13  * version 2 for more details (a copy is included in the LICENSE file that

    14  * accompanied this code).

    15  *

    16  * You should have received a copy of the GNU General Public License version

    17  * 2 along with this work; if not, write to the Free Software Foundation,

    18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    19  *

    20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    21  * or visit www.oracle.com if you need additional information or have any

    22  * questions.

    23  *

    24  */

    25 

    26 #ifndef SHARE_MEMORY_METASPACE_CLASSLOADERMETASPACE_HPP

    27 #define SHARE_MEMORY_METASPACE_CLASSLOADERMETASPACE_HPP

    28 

    29 #include "memory/allocation.hpp"

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

    31 

    32 class Mutex;

    33 

    34 namespace metaspace {

    35 

    36 class SpaceManager;

    37 struct clms_stats_t;

    38 

    39 class ClassLoaderMetaspace : public CHeapObj<mtClass> {

    40 

    41   // The CLD lock.

    42   Mutex* const _lock;

    43 

    44   const MetaspaceType _space_type;

    45 

    46   SpaceManager* _non_class_space_manager;

    47   SpaceManager* _class_space_manager;

    48 

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

    50   SpaceManager* non_class_space_manager() const  { return _non_class_space_manager; }

    51   SpaceManager* class_space_manager() const      { return _class_space_manager; }

    52 

    53   SpaceManager* get_space_manager(bool is_class) {

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

    55   }

    56 

    57 public:

    58 

    59   ClassLoaderMetaspace(Mutex* lock, MetaspaceType space_type);

    60 

    61   ~ClassLoaderMetaspace();

    62 

    63   MetaspaceType space_type() const { return _space_type; }

    64 

    65   // Allocate word_size words from Metaspace.

    66   MetaWord* allocate(size_t word_size, MetadataType mdType);

    67 

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

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

    70   MetaWord* expand_and_allocate(size_t word_size, MetadataType mdType);

    71 

    72   // Prematurely returns a metaspace allocation to the _block_freelists

    73   // because it is not needed anymore.

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

    75 

    76   // Update statistics. This walks all in-use chunks.

    77   void add_to_statistics(clms_stats_t* out) const;

    78 

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

    80 

    81   // TODO

    82   size_t allocated_blocks_bytes() const { return 0; }

    83   size_t allocated_chunks_bytes() const { return 0; }

    84 

    85 };

    86 

    87 } // namespace metaspace

    88 

    89 #endif // SHARE_MEMORY_METASPACE_CLASSLOADERMETASPACE_HPP