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annotate src/share/vm/classfile/resolutionErrors.cpp @ 21810:0366a71eda74

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8047125: (ref) More phantom object references Reviewed-by: mchung, dfuchs, ahgross, jmasa, brutisso, mgerdin Contributed-by: kim.barrett@oracle.com
author jmasa
date Fri, 26 Sep 2014 17:48:10 -0400
parents da91efe96a93
children
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1 /*
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2 * Copyright (c) 2005, 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 #include "precompiled.hpp"
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26 #include "classfile/resolutionErrors.hpp"
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27 #include "memory/resourceArea.hpp"
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28 #include "oops/oop.inline.hpp"
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29 #include "runtime/handles.inline.hpp"
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30 #include "runtime/safepoint.hpp"
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31 #include "utilities/hashtable.inline.hpp"
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32
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33 // add new entry to the table
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34 void ResolutionErrorTable::add_entry(int index, unsigned int hash,
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35 constantPoolHandle pool, int cp_index, Symbol* error)
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36 {
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37 assert_locked_or_safepoint(SystemDictionary_lock);
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38 assert(!pool.is_null() && error != NULL, "adding NULL obj");
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39
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40 ResolutionErrorEntry* entry = new_entry(hash, pool(), cp_index, error);
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41 add_entry(index, entry);
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42 }
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43
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44 // find entry in the table
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45 ResolutionErrorEntry* ResolutionErrorTable::find_entry(int index, unsigned int hash,
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46 constantPoolHandle pool, int cp_index)
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47 {
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48 assert_locked_or_safepoint(SystemDictionary_lock);
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49
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50 for (ResolutionErrorEntry *error_probe = bucket(index);
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51 error_probe != NULL;
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52 error_probe = error_probe->next()) {
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53 if (error_probe->hash() == hash && error_probe->pool() == pool()) {
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54 return error_probe;;
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55 }
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56 }
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57 return NULL;
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58 }
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59
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60 void ResolutionErrorEntry::set_error(Symbol* e) {
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61 assert(e == NULL || _error == NULL, "cannot reset error");
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62 _error = e;
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63 if (_error != NULL) _error->increment_refcount();
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64 }
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65
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66 // create new error entry
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67 ResolutionErrorEntry* ResolutionErrorTable::new_entry(int hash, ConstantPool* pool,
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68 int cp_index, Symbol* error)
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69 {
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70 ResolutionErrorEntry* entry = (ResolutionErrorEntry*)Hashtable<ConstantPool*, mtClass>::new_entry(hash, pool);
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71 entry->set_cp_index(cp_index);
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72 NOT_PRODUCT(entry->set_error(NULL);)
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73 entry->set_error(error);
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74
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75 return entry;
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76 }
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77
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78 void ResolutionErrorTable::free_entry(ResolutionErrorEntry *entry) {
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79 // decrement error refcount
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80 assert(entry->error() != NULL, "error should be set");
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81 entry->error()->decrement_refcount();
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82 Hashtable<ConstantPool*, mtClass>::free_entry(entry);
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83 }
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85
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86 // create resolution error table
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87 ResolutionErrorTable::ResolutionErrorTable(int table_size)
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88 : Hashtable<ConstantPool*, mtClass>(table_size, sizeof(ResolutionErrorEntry)) {
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89 }
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90
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91 // RedefineClasses support - remove matching entry of a
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92 // constant pool that is going away
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93 void ResolutionErrorTable::delete_entry(ConstantPool* c) {
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94 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
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95 for (int i = 0; i < table_size(); i++) {
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96 for (ResolutionErrorEntry** p = bucket_addr(i); *p != NULL; ) {
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97 ResolutionErrorEntry* entry = *p;
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98 assert(entry->pool() != NULL, "resolution error table is corrupt");
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99 if (entry->pool() == c) {
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100 *p = entry->next();
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101 free_entry(entry);
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102 } else {
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103 p = entry->next_addr();
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104 }
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105 }
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106 }
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107 }
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108
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109
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110 // Remove unloaded entries from the table
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111 void ResolutionErrorTable::purge_resolution_errors() {
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112 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
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113 for (int i = 0; i < table_size(); i++) {
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114 for (ResolutionErrorEntry** p = bucket_addr(i); *p != NULL; ) {
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115 ResolutionErrorEntry* entry = *p;
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116 assert(entry->pool() != (ConstantPool*)NULL, "resolution error table is corrupt");
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117 ConstantPool* pool = entry->pool();
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118 assert(pool->pool_holder() != NULL, "Constant pool without a class?");
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119 ClassLoaderData* loader_data =
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120 pool->pool_holder()->class_loader_data();
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121 if (!loader_data->is_unloading()) {
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122 p = entry->next_addr();
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123 } else {
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124 *p = entry->next();
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125 free_entry(entry);
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126 }
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127 }
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128 }
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129 }