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annotate src/share/vm/memory/metaspaceShared.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 fb19af007ffc
children 622c6e0ad4d6
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1 /*
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2 * Copyright (c) 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 #ifndef SHARE_VM_MEMORY_METASPACE_SHARED_HPP
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25 #define SHARE_VM_MEMORY_METASPACE_SHARED_HPP
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26
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27 #include "memory/allocation.hpp"
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28 #include "memory/memRegion.hpp"
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29 #include "runtime/virtualspace.hpp"
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30 #include "utilities/exceptions.hpp"
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31 #include "utilities/macros.hpp"
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32
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33 class FileMapInfo;
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34
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35 // Class Data Sharing Support
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36 class MetaspaceShared : AllStatic {
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37
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38 // CDS support
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39 static ReservedSpace* _shared_rs;
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40 static int _max_alignment;
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41 static bool _link_classes_made_progress;
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42 static bool _check_classes_made_progress;
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43 static bool _has_error_classes;
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44 static bool _archive_loading_failed;
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45 public:
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46 enum {
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47 vtbl_list_size = 17, // number of entries in the shared space vtable list.
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48 num_virtuals = 200 // maximum number of virtual functions
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49 // If virtual functions are added to Metadata,
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50 // this number needs to be increased. Also,
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51 // SharedMiscCodeSize will need to be increased.
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52 };
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53
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54 enum {
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55 ro = 0, // read-only shared space in the heap
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56 rw = 1, // read-write shared space in the heap
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57 md = 2, // miscellaneous data for initializing tables, etc.
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58 mc = 3, // miscellaneous code - vtable replacement.
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59 n_regions = 4
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60 };
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61
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62 // Accessor functions to save shared space created for metadata, which has
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63 // extra space allocated at the end for miscellaneous data and code.
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64 static void set_max_alignment(int alignment) {
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65 CDS_ONLY(_max_alignment = alignment);
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66 }
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67
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68 static int max_alignment() {
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69 CDS_ONLY(return _max_alignment);
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70 NOT_CDS(return 0);
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71 }
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72
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73 static void prepare_for_dumping() NOT_CDS_RETURN;
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74 static void preload_and_dump(TRAPS) NOT_CDS_RETURN;
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75 static int preload_and_dump(const char * class_list_path,
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76 GrowableArray<Klass*>* class_promote_order,
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77 TRAPS) NOT_CDS_RETURN;
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78
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79 static ReservedSpace* shared_rs() {
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80 CDS_ONLY(return _shared_rs);
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81 NOT_CDS(return NULL);
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82 }
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83
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84 static void set_shared_rs(ReservedSpace* rs) {
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85 CDS_ONLY(_shared_rs = rs;)
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86 }
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87
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88 static void set_archive_loading_failed() {
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89 _archive_loading_failed = true;
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90 }
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91 static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false);
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92 static void initialize_shared_spaces() NOT_CDS_RETURN;
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93
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94 // Return true if given address is in the mapped shared space.
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95 static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false);
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96
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97 static void generate_vtable_methods(void** vtbl_list,
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98 void** vtable,
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99 char** md_top, char* md_end,
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100 char** mc_top, char* mc_end);
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101 static void serialize(SerializeClosure* sc);
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102
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103 // JVM/TI RedefineClasses() support:
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104 // Remap the shared readonly space to shared readwrite, private if
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105 // sharing is enabled. Simply returns true if sharing is not enabled
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106 // or if the remapping has already been done by a prior call.
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107 static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true);
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108
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109 static void print_shared_spaces();
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110
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111 static bool try_link_class(InstanceKlass* ik, TRAPS);
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112 static void link_one_shared_class(Klass* obj, TRAPS);
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113 static void check_one_shared_class(Klass* obj);
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114 static void link_and_cleanup_shared_classes(TRAPS);
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115 };
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116 #endif // SHARE_VM_MEMORY_METASPACE_SHARED_HPP