jdk8-mips64-public/hotspot: src/share/vm/memory/metadataFactory.hpp@da91efe96a93

6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>

     1 /*

     2  * Copyright (c) 2010, 2012, 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  */

    25 #ifndef SHARE_VM_MEMORY_METADATAFACTORY_HPP

    26 #define SHARE_VM_MEMORY_METADATAFACTORY_HPP

    28 #include "utilities/array.hpp"

    29 #include "utilities/exceptions.hpp"

    30 #include "utilities/globalDefinitions.hpp"

    32 class MetadataFactory : AllStatic {

    33  public:

    34   template <typename T>

    35   static Array<T>* new_array(ClassLoaderData* loader_data, int length, TRAPS) {

    36     // The "true" argument is because all metadata arrays are read only when

    37     // dumped to the shared archive

    38     return new (loader_data, length, /*read_only*/true, THREAD) Array<T>(length);

    39   }

    41   template <typename T>

    42   static Array<T>* new_array(ClassLoaderData* loader_data, int length, T value, TRAPS) {

    43     Array<T>* array = new_array<T>(loader_data, length, CHECK_NULL);

    44     for (int i = 0; i < length; i++) {

    45       array->at_put(i, value);

    46     }

    47     return array;

    48   }

    50   template <typename T>

    51   static Array<T>* new_writeable_array(ClassLoaderData* loader_data, int length, TRAPS) {

    52     return new (loader_data, length, /*read_only*/false, THREAD) Array<T>(length);

    53   }

    55   template <typename T>

    56   static Array<T>* new_writeable_array(ClassLoaderData* loader_data, int length, T value, TRAPS) {

    57     Array<T>* array = new_writeable_array<T>(loader_data, length, CHECK_NULL);

    58     for (int i = 0; i < length; i++) {

    59       array->at_put(i, value);

    60     }

    61     return array;

    62   }

    64   template <typename T>

    65   static void free_array(ClassLoaderData* loader_data, Array<T>* data) {

    66     if (data != NULL) {

    67       assert(loader_data != NULL, "shouldn't pass null");

    68       int size = data->size();

    69       loader_data->metaspace_non_null()->deallocate((MetaWord*)data, size, false);

    70     }

    71   }

    73   // Deallocation method for metadata

    74   template <class T>

    75   static void free_metadata(ClassLoaderData* loader_data, T md) {

    76     if (md != NULL) {

    77       assert(loader_data != NULL, "shouldn't pass null");

    78       int size = md->size();

    79       // Call metadata's deallocate function which will call deallocate fields

    80       assert(!md->on_stack(), "can't deallocate things on stack");

    81       md->deallocate_contents(loader_data);

    82       loader_data->metaspace_non_null()->deallocate((MetaWord*)md, size, md->is_klass());

    83     }

    84   }

    85 };

    87 #endif // SHARE_VM_MEMORY_METADATAFACTORY_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/memory/metadataFactory.hpp@da91efe96a93

src/share/vm/memory/metadataFactory.hpp