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annotate src/share/vm/classfile/resolutionErrors.cpp @ 6972:bd7a7ce2e264

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6830717: replay of compilations would help with debugging Summary: When java process crashed in compiler thread, repeat the compilation process will help finding root cause. This is done with using SA dump application class data and replay data from core dump, then use debug version of jvm to recompile the problematic java method. Reviewed-by: kvn, twisti, sspitsyn Contributed-by: yumin.qi@oracle.com
author minqi
date Mon, 12 Nov 2012 14:03:53 -0800
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 }