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annotate src/share/vm/memory/metadataFactory.hpp @ 20375:6e0cb14ce59b

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8046070: Class Data Sharing clean up and refactoring Summary: Cleaned up CDS to be more configurable, maintainable and extensible Reviewed-by: dholmes, coleenp, acorn, mchung
author iklam
date Thu, 21 Aug 2014 13:57:51 -0700
parents 2c6ef90f030a
children 4cb90023bf2b
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1 /*
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2 * Copyright (c) 2010, 2013, 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 "classfile/classLoaderData.hpp"
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29 #include "utilities/array.hpp"
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30 #include "utilities/exceptions.hpp"
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31 #include "utilities/globalDefinitions.hpp"
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32
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33 class MetadataFactory : AllStatic {
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34 public:
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35 template <typename T>
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36 static Array<T>* new_array(ClassLoaderData* loader_data, int length, TRAPS) {
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37 // The "true" argument is because all metadata arrays are read only when
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38 // dumped to the shared archive
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39 return new (loader_data, length, /*read_only*/true, THREAD) Array<T>(length);
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40 }
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41
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42 template <typename T>
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43 static Array<T>* new_array(ClassLoaderData* loader_data, int length, T value, TRAPS) {
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44 Array<T>* array = new_array<T>(loader_data, length, CHECK_NULL);
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45 for (int i = 0; i < length; i++) {
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46 array->at_put(i, value);
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47 }
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48 return array;
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49 }
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50
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51 template <typename T>
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52 static Array<T>* new_writeable_array(ClassLoaderData* loader_data, int length, TRAPS) {
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53 return new (loader_data, length, /*read_only*/false, THREAD) Array<T>(length);
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54 }
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55
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56 template <typename T>
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57 static Array<T>* new_writeable_array(ClassLoaderData* loader_data, int length, T value, TRAPS) {
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58 Array<T>* array = new_writeable_array<T>(loader_data, length, CHECK_NULL);
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59 for (int i = 0; i < length; i++) {
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60 array->at_put(i, value);
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61 }
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62 return array;
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63 }
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64
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65 template <typename T>
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66 static void free_array(ClassLoaderData* loader_data, Array<T>* data) {
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67 if (data != NULL) {
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68 assert(loader_data != NULL, "shouldn't pass null");
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69 assert(!data->is_shared(), "cannot deallocate array in shared spaces");
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70 int size = data->size();
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71 if (DumpSharedSpaces) {
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72 loader_data->ro_metaspace()->deallocate((MetaWord*)data, size, false);
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73 } else {
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74 loader_data->metaspace_non_null()->deallocate((MetaWord*)data, size, false);
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75 }
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76 }
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77 }
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78
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79 // Deallocation method for metadata
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80 template <class T>
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81 static void free_metadata(ClassLoaderData* loader_data, T md) {
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82 if (DumpSharedSpaces) {
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83 // FIXME: the freeing code is buggy, especially when PrintSharedSpaces is enabled.
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84 // Disable for now -- this means if you specify bad classes in your classlist you
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85 // may have wasted space inside the archive.
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86 return;
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87 }
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88 if (md != NULL) {
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89 assert(loader_data != NULL, "shouldn't pass null");
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90 int size = md->size();
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91 // Call metadata's deallocate function which will call deallocate fields
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92 assert(!DumpSharedSpaces, "cannot deallocate metadata when dumping CDS archive");
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93 assert(!md->on_stack(), "can't deallocate things on stack");
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94 assert(!md->is_shared(), "cannot deallocate if in shared spaces");
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95 md->deallocate_contents(loader_data);
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96 loader_data->metaspace_non_null()->deallocate((MetaWord*)md, size, md->is_klass());
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97 }
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98 }
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99 };
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100
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101 #endif // SHARE_VM_MEMORY_METADATAFACTORY_HPP