1 /* 2 * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/resolutionErrors.hpp" 27 #include "memory/resourceArea.hpp" 28 #include "oops/oop.inline.hpp" 29 #include "runtime/handles.inline.hpp" 30 #include "runtime/safepoint.hpp" 31 #include "utilities/hashtable.inline.hpp" 32 33 // add new entry to the table 34 void ResolutionErrorTable::add_entry(int index, unsigned int hash, 35 const constantPoolHandle& pool, int cp_index, 36 Symbol* error, Symbol* message) 37 { 38 assert_locked_or_safepoint(SystemDictionary_lock); 39 assert(!pool.is_null() && error != NULL, "adding NULL obj"); 40 41 ResolutionErrorEntry* entry = new_entry(hash, pool(), cp_index, error, message); 42 add_entry(index, entry); 43 } 44 45 // find entry in the table 46 ResolutionErrorEntry* ResolutionErrorTable::find_entry(int index, unsigned int hash, 47 const constantPoolHandle& pool, int cp_index) 48 { 49 assert_locked_or_safepoint(SystemDictionary_lock); 50 51 for (ResolutionErrorEntry *error_probe = bucket(index); 52 error_probe != NULL; 53 error_probe = error_probe->next()) { 54 if (error_probe->hash() == hash && error_probe->pool() == pool()) { 55 return error_probe;; 56 } 57 } 58 return NULL; 59 } 60 61 void ResolutionErrorEntry::set_error(Symbol* e) { 62 assert(e != NULL, "must set a value"); 63 _error = e; 64 _error->increment_refcount(); 65 } 66 67 void ResolutionErrorEntry::set_message(Symbol* c) { 68 _message = c; 69 if (_message != NULL) { 70 _message->increment_refcount(); 71 } 72 } 73 74 // create new error entry 75 ResolutionErrorEntry* ResolutionErrorTable::new_entry(int hash, ConstantPool* pool, 76 int cp_index, Symbol* error, 77 Symbol* message) 78 { 79 ResolutionErrorEntry* entry = (ResolutionErrorEntry*)Hashtable<ConstantPool*, mtClass>::new_entry(hash, pool); 80 entry->set_cp_index(cp_index); 81 entry->set_error(error); 82 entry->set_message(message); 83 84 return entry; 85 } 86 87 void ResolutionErrorTable::free_entry(ResolutionErrorEntry *entry) { 88 // decrement error refcount 89 assert(entry->error() != NULL, "error should be set"); 90 entry->error()->decrement_refcount(); 91 if (entry->message() != NULL) { 92 entry->message()->decrement_refcount(); 93 } 94 Hashtable<ConstantPool*, mtClass>::free_entry(entry); 95 } 96 97 98 // create resolution error table 99 ResolutionErrorTable::ResolutionErrorTable(int table_size) 100 : Hashtable<ConstantPool*, mtClass>(table_size, sizeof(ResolutionErrorEntry)) { 101 } 102 103 // RedefineClasses support - remove matching entry of a 104 // constant pool that is going away 105 void ResolutionErrorTable::delete_entry(ConstantPool* c) { 106 assert_locked_or_safepoint(SystemDictionary_lock); 107 for (int i = 0; i < table_size(); i++) { 108 for (ResolutionErrorEntry** p = bucket_addr(i); *p != NULL; ) { 109 ResolutionErrorEntry* entry = *p; 110 assert(entry->pool() != NULL, "resolution error table is corrupt"); 111 if (entry->pool() == c) { 112 *p = entry->next(); 113 free_entry(entry); 114 } else { 115 p = entry->next_addr(); 116 } 117 } 118 } 119 } 120 121 122 // Remove unloaded entries from the table 123 void ResolutionErrorTable::purge_resolution_errors() { 124 assert_locked_or_safepoint(SystemDictionary_lock); 125 for (int i = 0; i < table_size(); i++) { 126 for (ResolutionErrorEntry** p = bucket_addr(i); *p != NULL; ) { 127 ResolutionErrorEntry* entry = *p; 128 assert(entry->pool() != (ConstantPool*)NULL, "resolution error table is corrupt"); 129 ConstantPool* pool = entry->pool(); 130 assert(pool->pool_holder() != NULL, "Constant pool without a class?"); 131 132 if (pool->pool_holder()->is_loader_alive()) { 133 p = entry->next_addr(); 134 } else { 135 *p = entry->next(); 136 free_entry(entry); 137 } 138 } 139 } 140 }