Mercurial > hg > truffle
annotate src/share/vm/classfile/placeholders.cpp @ 1744:f8c5d1bdaad4
6885308: The incorrect -XX:StackRedPages, -XX:StackShadowPages, -XX:StackYellowPages could cause VM crash
Summary: Test minimal stack sizes given (also fixed linux compilation error)
Reviewed-by: never, phh, coleenp
author | ptisnovs |
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date | Thu, 19 Aug 2010 14:23:59 -0400 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2007, Oracle and/or its affiliates. All rights reserved. |
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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 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_placeholders.cpp.incl" | |
27 | |
28 // Placeholder methods | |
29 | |
30 PlaceholderEntry* PlaceholderTable::new_entry(int hash, symbolOop name, | |
31 oop loader, bool havesupername, | |
32 symbolOop supername) { | |
33 PlaceholderEntry* entry = (PlaceholderEntry*)Hashtable::new_entry(hash, name); | |
34 entry->set_loader(loader); | |
35 entry->set_havesupername(havesupername); | |
36 entry->set_supername(supername); | |
37 entry->set_superThreadQ(NULL); | |
38 entry->set_loadInstanceThreadQ(NULL); | |
39 entry->set_defineThreadQ(NULL); | |
40 entry->set_definer(NULL); | |
41 entry->set_instanceKlass(NULL); | |
42 return entry; | |
43 } | |
44 | |
45 | |
46 // Placeholder objects represent classes currently being loaded. | |
47 // All threads examining the placeholder table must hold the | |
48 // SystemDictionary_lock, so we don't need special precautions | |
49 // on store ordering here. | |
50 void PlaceholderTable::add_entry(int index, unsigned int hash, | |
51 symbolHandle class_name, Handle class_loader, | |
52 bool havesupername, symbolHandle supername){ | |
53 assert_locked_or_safepoint(SystemDictionary_lock); | |
54 assert(!class_name.is_null(), "adding NULL obj"); | |
55 | |
56 // Both readers and writers are locked so it's safe to just | |
57 // create the placeholder and insert it in the list without a membar. | |
58 PlaceholderEntry* entry = new_entry(hash, class_name(), class_loader(), havesupername, supername()); | |
59 add_entry(index, entry); | |
60 } | |
61 | |
62 | |
63 // Remove a placeholder object. | |
64 void PlaceholderTable::remove_entry(int index, unsigned int hash, | |
65 symbolHandle class_name, | |
66 Handle class_loader) { | |
67 assert_locked_or_safepoint(SystemDictionary_lock); | |
68 PlaceholderEntry** p = bucket_addr(index); | |
69 while (*p) { | |
70 PlaceholderEntry *probe = *p; | |
71 if (probe->hash() == hash && probe->equals(class_name(), class_loader())) { | |
72 // Delete entry | |
73 *p = probe->next(); | |
74 free_entry(probe); | |
75 return; | |
76 } | |
77 p = probe->next_addr(); | |
78 } | |
79 } | |
80 | |
81 PlaceholderEntry* PlaceholderTable::get_entry(int index, unsigned int hash, | |
82 symbolHandle class_name, | |
83 Handle class_loader) { | |
84 assert_locked_or_safepoint(SystemDictionary_lock); | |
85 | |
86 symbolOop class_name_ = class_name(); | |
87 oop class_loader_ = class_loader(); | |
88 | |
89 for (PlaceholderEntry *place_probe = bucket(index); | |
90 place_probe != NULL; | |
91 place_probe = place_probe->next()) { | |
92 if (place_probe->hash() == hash && | |
93 place_probe->equals(class_name_, class_loader_)) { | |
94 return place_probe; | |
95 } | |
96 } | |
97 return NULL; | |
98 } | |
99 | |
100 symbolOop PlaceholderTable::find_entry(int index, unsigned int hash, | |
101 symbolHandle class_name, | |
102 Handle class_loader) { | |
103 PlaceholderEntry* probe = get_entry(index, hash, class_name, class_loader); | |
104 return (probe? probe->klass(): symbolOop(NULL)); | |
105 } | |
106 | |
107 // find_and_add returns probe pointer - old or new | |
108 // If no entry exists, add a placeholder entry | |
109 // If entry exists, reuse entry | |
110 // For both, push SeenThread for classloadAction | |
111 // if havesupername: this is used for circularity for instanceklass loading | |
112 PlaceholderEntry* PlaceholderTable::find_and_add(int index, unsigned int hash, symbolHandle name, Handle loader, classloadAction action, symbolHandle supername, Thread* thread) { | |
113 PlaceholderEntry* probe = get_entry(index, hash, name, loader); | |
114 if (probe == NULL) { | |
115 // Nothing found, add place holder | |
116 add_entry(index, hash, name, loader, (action == LOAD_SUPER), supername); | |
117 probe = get_entry(index, hash, name, loader); | |
118 } else { | |
119 if (action == LOAD_SUPER) { | |
120 probe->set_havesupername(true); | |
121 probe->set_supername(supername()); | |
122 } | |
123 } | |
124 if (probe) probe->add_seen_thread(thread, action); | |
125 return probe; | |
126 } | |
127 | |
128 | |
129 // placeholder used to track class loading internal states | |
130 // placeholder existence now for loading superclass/superinterface | |
131 // superthreadQ tracks class circularity, while loading superclass/superinterface | |
132 // loadInstanceThreadQ tracks load_instance_class calls | |
133 // definer() tracks the single thread that owns define token | |
134 // defineThreadQ tracks waiters on defining thread's results | |
135 // 1st claimant creates placeholder | |
136 // find_and_add adds SeenThread entry for appropriate queue | |
137 // All claimants remove SeenThread after completing action | |
138 // On removal: if definer and all queues empty, remove entry | |
139 // Note: you can be in both placeholders and systemDictionary | |
140 // see parse_stream for redefine classes | |
141 // Therefore - must always check SD first | |
142 // Ignores the case where entry is not found | |
143 void PlaceholderTable::find_and_remove(int index, unsigned int hash, | |
144 symbolHandle name, Handle loader, Thread* thread) { | |
145 assert_locked_or_safepoint(SystemDictionary_lock); | |
146 PlaceholderEntry *probe = get_entry(index, hash, name, loader); | |
147 if (probe != NULL) { | |
148 // No other threads using this entry | |
149 if ((probe->superThreadQ() == NULL) && (probe->loadInstanceThreadQ() == NULL) | |
150 && (probe->defineThreadQ() == NULL) && (probe->definer() == NULL)) { | |
151 remove_entry(index, hash, name, loader); | |
152 } | |
153 } | |
154 } | |
155 | |
156 PlaceholderTable::PlaceholderTable(int table_size) | |
157 : TwoOopHashtable(table_size, sizeof(PlaceholderEntry)) { | |
158 } | |
159 | |
160 | |
161 void PlaceholderTable::oops_do(OopClosure* f) { | |
162 for (int index = 0; index < table_size(); index++) { | |
163 for (PlaceholderEntry* probe = bucket(index); | |
164 probe != NULL; | |
165 probe = probe->next()) { | |
166 probe->oops_do(f); | |
167 } | |
168 } | |
169 } | |
170 | |
171 | |
172 void PlaceholderEntry::oops_do(OopClosure* blk) { | |
173 assert(klass() != NULL, "should have a non-null klass"); | |
174 blk->do_oop((oop*)klass_addr()); | |
175 if (_loader != NULL) { | |
176 blk->do_oop(loader_addr()); | |
177 } | |
178 if (_supername != NULL) { | |
179 blk->do_oop((oop*)supername_addr()); | |
180 } | |
181 if (_instanceKlass != NULL) { | |
182 blk->do_oop((oop*)instanceKlass_addr()); | |
183 } | |
184 } | |
185 | |
186 // do all entries in the placeholder table | |
187 void PlaceholderTable::entries_do(void f(symbolOop, oop)) { | |
188 for (int index = 0; index < table_size(); index++) { | |
189 for (PlaceholderEntry* probe = bucket(index); | |
190 probe != NULL; | |
191 probe = probe->next()) { | |
192 f(probe->klass(), probe->loader()); | |
193 } | |
194 } | |
195 } | |
196 | |
197 | |
198 #ifndef PRODUCT | |
199 // Note, doesn't append a cr | |
200 void PlaceholderEntry::print() const { | |
201 klass()->print_value(); | |
202 if (loader() != NULL) { | |
203 tty->print(", loader "); | |
204 loader()->print_value(); | |
205 } | |
206 if (supername() != NULL) { | |
207 tty->print(", supername "); | |
208 supername()->print_value(); | |
209 } | |
210 if (definer() != NULL) { | |
211 tty->print(", definer "); | |
212 definer()->print_value(); | |
213 } | |
214 if (instanceKlass() != NULL) { | |
215 tty->print(", instanceKlass "); | |
216 instanceKlass()->print_value(); | |
217 } | |
218 tty->print("\n"); | |
219 tty->print("loadInstanceThreadQ threads:"); | |
220 loadInstanceThreadQ()->printActionQ(); | |
221 tty->print("\n"); | |
222 tty->print("superThreadQ threads:"); | |
223 superThreadQ()->printActionQ(); | |
224 tty->print("\n"); | |
225 tty->print("defineThreadQ threads:"); | |
226 defineThreadQ()->printActionQ(); | |
227 tty->print("\n"); | |
228 } | |
229 #endif | |
230 | |
231 void PlaceholderEntry::verify() const { | |
232 guarantee(loader() == NULL || loader()->is_instance(), | |
233 "checking type of _loader"); | |
234 guarantee(instanceKlass() == NULL | |
235 || Klass::cast(instanceKlass())->oop_is_instance(), | |
236 "checking type of instanceKlass result"); | |
237 klass()->verify(); | |
238 } | |
239 | |
240 void PlaceholderTable::verify() { | |
241 int element_count = 0; | |
242 for (int pindex = 0; pindex < table_size(); pindex++) { | |
243 for (PlaceholderEntry* probe = bucket(pindex); | |
244 probe != NULL; | |
245 probe = probe->next()) { | |
246 probe->verify(); | |
247 element_count++; // both klasses and place holders count | |
248 } | |
249 } | |
250 guarantee(number_of_entries() == element_count, | |
251 "Verify of system dictionary failed"); | |
252 } | |
253 | |
254 | |
255 #ifndef PRODUCT | |
256 void PlaceholderTable::print() { | |
257 for (int pindex = 0; pindex < table_size(); pindex++) { | |
258 for (PlaceholderEntry* probe = bucket(pindex); | |
259 probe != NULL; | |
260 probe = probe->next()) { | |
261 if (Verbose) tty->print("%4d: ", pindex); | |
262 tty->print(" place holder "); | |
263 | |
264 probe->print(); | |
265 tty->cr(); | |
266 } | |
267 } | |
268 } | |
269 #endif |