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annotate src/share/vm/memory/metadataFactory.hpp @ 6725:da91efe96a93

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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>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
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children 59a58e20dc60
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1 /*
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2 * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_MEMORY_METADATAFACTORY_HPP
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26 #define SHARE_VM_MEMORY_METADATAFACTORY_HPP
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27
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28 #include "utilities/array.hpp"
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29 #include "utilities/exceptions.hpp"
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30 #include "utilities/globalDefinitions.hpp"
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31
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32 class MetadataFactory : AllStatic {
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33 public:
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34 template <typename T>
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35 static Array<T>* new_array(ClassLoaderData* loader_data, int length, TRAPS) {
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36 // The "true" argument is because all metadata arrays are read only when
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37 // dumped to the shared archive
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38 return new (loader_data, length, /*read_only*/true, THREAD) Array<T>(length);
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39 }
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40
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41 template <typename T>
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42 static Array<T>* new_array(ClassLoaderData* loader_data, int length, T value, TRAPS) {
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43 Array<T>* array = new_array<T>(loader_data, length, CHECK_NULL);
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44 for (int i = 0; i < length; i++) {
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45 array->at_put(i, value);
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46 }
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47 return array;
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48 }
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49
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50 template <typename T>
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51 static Array<T>* new_writeable_array(ClassLoaderData* loader_data, int length, TRAPS) {
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52 return new (loader_data, length, /*read_only*/false, THREAD) Array<T>(length);
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53 }
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54
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55 template <typename T>
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56 static Array<T>* new_writeable_array(ClassLoaderData* loader_data, int length, T value, TRAPS) {
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57 Array<T>* array = new_writeable_array<T>(loader_data, length, CHECK_NULL);
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58 for (int i = 0; i < length; i++) {
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59 array->at_put(i, value);
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60 }
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61 return array;
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62 }
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63
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64 template <typename T>
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65 static void free_array(ClassLoaderData* loader_data, Array<T>* data) {
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66 if (data != NULL) {
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67 assert(loader_data != NULL, "shouldn't pass null");
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68 int size = data->size();
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69 loader_data->metaspace_non_null()->deallocate((MetaWord*)data, size, false);
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70 }
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71 }
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72
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73 // Deallocation method for metadata
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74 template <class T>
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75 static void free_metadata(ClassLoaderData* loader_data, T md) {
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76 if (md != NULL) {
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77 assert(loader_data != NULL, "shouldn't pass null");
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78 int size = md->size();
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79 // Call metadata's deallocate function which will call deallocate fields
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80 assert(!md->on_stack(), "can't deallocate things on stack");
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81 md->deallocate_contents(loader_data);
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82 loader_data->metaspace_non_null()->deallocate((MetaWord*)md, size, md->is_klass());
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83 }
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84 }
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85 };
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86
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87 #endif // SHARE_VM_MEMORY_METADATAFACTORY_HPP