Mercurial > hg > truffle
annotate src/share/vm/classfile/resolutionErrors.cpp @ 12837:82af7d7a0128
8003420: NPG: make new GC root for pd_set
Summary: Move protection domain oops from system dictionary entries into a seperate set; the system dictionary references entries in that set now. This allows fast iteration during non-classunloading garbage collection. Implementation based on initial prototype from Ioi Lam (iklam).
Reviewed-by: coleenp, iklam
author | tschatzl |
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date | Wed, 09 Oct 2013 10:57:01 +0200 |
parents | da91efe96a93 |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 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" | |
0 | 32 |
33 // add new entry to the table | |
34 void ResolutionErrorTable::add_entry(int index, unsigned int hash, | |
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35 constantPoolHandle pool, int cp_index, Symbol* error) |
0 | 36 { |
37 assert_locked_or_safepoint(SystemDictionary_lock); | |
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38 assert(!pool.is_null() && error != NULL, "adding NULL obj"); |
0 | 39 |
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40 ResolutionErrorEntry* entry = new_entry(hash, pool(), cp_index, error); |
0 | 41 add_entry(index, entry); |
42 } | |
43 | |
44 // find entry in the table | |
45 ResolutionErrorEntry* ResolutionErrorTable::find_entry(int index, unsigned int hash, | |
46 constantPoolHandle pool, int cp_index) | |
47 { | |
48 assert_locked_or_safepoint(SystemDictionary_lock); | |
49 | |
50 for (ResolutionErrorEntry *error_probe = bucket(index); | |
51 error_probe != NULL; | |
52 error_probe = error_probe->next()) { | |
53 if (error_probe->hash() == hash && error_probe->pool() == pool()) { | |
54 return error_probe;; | |
55 } | |
56 } | |
57 return NULL; | |
58 } | |
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 |
0 | 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) |
0 | 69 { |
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70 ResolutionErrorEntry* entry = (ResolutionErrorEntry*)Hashtable<ConstantPool*, mtClass>::new_entry(hash, pool); |
0 | 71 entry->set_cp_index(cp_index); |
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72 NOT_PRODUCT(entry->set_error(NULL);) |
0 | 73 entry->set_error(error); |
74 | |
75 return entry; | |
76 } | |
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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84 |
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85 |
0 | 86 // create resolution error table |
87 ResolutionErrorTable::ResolutionErrorTable(int table_size) | |
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88 : Hashtable<ConstantPool*, mtClass>(table_size, sizeof(ResolutionErrorEntry)) { |
0 | 89 } |
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"); |
0 | 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 } |
0 | 105 } |
106 } | |
107 } | |
108 | |
109 | |
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"); |
0 | 113 for (int i = 0; i < table_size(); i++) { |
114 for (ResolutionErrorEntry** p = bucket_addr(i); *p != NULL; ) { | |
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()) { |
0 | 122 p = entry->next_addr(); |
123 } else { | |
124 *p = entry->next(); | |
125 free_entry(entry); | |
126 } | |
127 } | |
128 } | |
129 } |