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