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
34void 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
46ResolutionErrorEntry* 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
61void ResolutionErrorEntry::set_error(Symbol* e) {
62 assert(e != NULL, "must set a value");
63 _error = e;
64 _error->increment_refcount();
65}
66
67void ResolutionErrorEntry::set_message(Symbol* c) {
68 _message = c;
69 if (_message != NULL) {
70 _message->increment_refcount();
71 }
72}
73
74// create new error entry
75ResolutionErrorEntry* 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
87void 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
99ResolutionErrorTable::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
105void 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
123void 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}
141