Mercurial > hg > truffle
annotate src/share/vm/classfile/loaderConstraints.cpp @ 4142:bc8527f3071c
Adjust code base to new level of warnings.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sun, 18 Dec 2011 05:24:06 +0100 |
parents | 1d1603768966 |
children | d2a62e0f25eb |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2011, 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/loaderConstraints.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 LoaderConstraintTable::LoaderConstraintTable(int nof_buckets) | |
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34 : Hashtable<klassOop>(nof_buckets, sizeof(LoaderConstraintEntry)) {}; |
0 | 35 |
36 | |
37 LoaderConstraintEntry* LoaderConstraintTable::new_entry( | |
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38 unsigned int hash, Symbol* name, |
0 | 39 klassOop klass, int num_loaders, |
40 int max_loaders) { | |
41 LoaderConstraintEntry* entry; | |
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42 entry = (LoaderConstraintEntry*)Hashtable<klassOop>::new_entry(hash, klass); |
0 | 43 entry->set_name(name); |
44 entry->set_num_loaders(num_loaders); | |
45 entry->set_max_loaders(max_loaders); | |
46 return entry; | |
47 } | |
48 | |
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49 void LoaderConstraintTable::free_entry(LoaderConstraintEntry *entry) { |
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50 // decrement name refcount before freeing |
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51 entry->name()->decrement_refcount(); |
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52 Hashtable<klassOop>::free_entry(entry); |
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53 } |
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54 |
0 | 55 |
56 void LoaderConstraintTable::oops_do(OopClosure* f) { | |
57 for (int index = 0; index < table_size(); index++) { | |
58 for (LoaderConstraintEntry* probe = bucket(index); | |
59 probe != NULL; | |
60 probe = probe->next()) { | |
61 if (probe->klass() != NULL) { | |
62 f->do_oop((oop*)probe->klass_addr()); | |
63 } | |
64 for (int n = 0; n < probe->num_loaders(); n++) { | |
65 if (probe->loader(n) != NULL) { | |
66 f->do_oop(probe->loader_addr(n)); | |
67 } | |
68 } | |
69 } | |
70 } | |
71 } | |
72 | |
73 | |
74 // The loaderConstraintTable must always be accessed with the | |
75 // SystemDictionary lock held. This is true even for readers as | |
76 // entries in the table could be being dynamically resized. | |
77 | |
78 LoaderConstraintEntry** LoaderConstraintTable::find_loader_constraint( | |
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79 Symbol* name, Handle loader) { |
0 | 80 |
81 unsigned int hash = compute_hash(name); | |
82 int index = hash_to_index(hash); | |
83 LoaderConstraintEntry** pp = bucket_addr(index); | |
84 while (*pp) { | |
85 LoaderConstraintEntry* p = *pp; | |
86 if (p->hash() == hash) { | |
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87 if (p->name() == name) { |
0 | 88 for (int i = p->num_loaders() - 1; i >= 0; i--) { |
89 if (p->loader(i) == loader()) { | |
90 return pp; | |
91 } | |
92 } | |
93 } | |
94 } | |
95 pp = p->next_addr(); | |
96 } | |
97 return pp; | |
98 } | |
99 | |
100 | |
101 void LoaderConstraintTable::purge_loader_constraints(BoolObjectClosure* is_alive) { | |
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102 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
0 | 103 // Remove unloaded entries from constraint table |
104 for (int index = 0; index < table_size(); index++) { | |
105 LoaderConstraintEntry** p = bucket_addr(index); | |
106 while(*p) { | |
107 LoaderConstraintEntry* probe = *p; | |
108 klassOop klass = probe->klass(); | |
109 // Remove klass that is no longer alive | |
110 if (klass != NULL && !is_alive->do_object_b(klass)) { | |
111 probe->set_klass(NULL); | |
112 if (TraceLoaderConstraints) { | |
113 ResourceMark rm; | |
114 tty->print_cr("[Purging class object from constraint for name %s," | |
115 " loader list:", | |
116 probe->name()->as_C_string()); | |
117 for (int i = 0; i < probe->num_loaders(); i++) { | |
118 tty->print_cr("[ [%d]: %s", i, | |
119 SystemDictionary::loader_name(probe->loader(i))); | |
120 } | |
121 } | |
122 } | |
123 // Remove entries no longer alive from loader array | |
124 int n = 0; | |
125 while (n < probe->num_loaders()) { | |
126 if (probe->loader(n) != NULL) { | |
127 if (!is_alive->do_object_b(probe->loader(n))) { | |
128 if (TraceLoaderConstraints) { | |
129 ResourceMark rm; | |
130 tty->print_cr("[Purging loader %s from constraint for name %s", | |
131 SystemDictionary::loader_name(probe->loader(n)), | |
132 probe->name()->as_C_string() | |
133 ); | |
134 } | |
135 | |
136 // Compact array | |
137 int num = probe->num_loaders() - 1; | |
138 probe->set_num_loaders(num); | |
139 probe->set_loader(n, probe->loader(num)); | |
140 probe->set_loader(num, NULL); | |
141 | |
142 if (TraceLoaderConstraints) { | |
143 ResourceMark rm; | |
144 tty->print_cr("[New loader list:"); | |
145 for (int i = 0; i < probe->num_loaders(); i++) { | |
146 tty->print_cr("[ [%d]: %s", i, | |
147 SystemDictionary::loader_name(probe->loader(i))); | |
148 } | |
149 } | |
150 | |
151 continue; // current element replaced, so restart without | |
152 // incrementing n | |
153 } | |
154 } | |
155 n++; | |
156 } | |
157 // Check whether entry should be purged | |
158 if (probe->num_loaders() < 2) { | |
159 if (TraceLoaderConstraints) { | |
160 ResourceMark rm; | |
161 tty->print("[Purging complete constraint for name %s\n", | |
162 probe->name()->as_C_string()); | |
163 } | |
164 | |
165 // Purge entry | |
166 *p = probe->next(); | |
167 FREE_C_HEAP_ARRAY(oop, probe->loaders()); | |
168 free_entry(probe); | |
169 } else { | |
170 #ifdef ASSERT | |
171 if (probe->klass() != NULL) { | |
172 assert(is_alive->do_object_b(probe->klass()), "klass should be live"); | |
173 } | |
174 for (n = 0; n < probe->num_loaders(); n++) { | |
175 if (probe->loader(n) != NULL) { | |
176 assert(is_alive->do_object_b(probe->loader(n)), "loader should be live"); | |
177 } | |
178 } | |
179 #endif | |
180 // Go to next entry | |
181 p = probe->next_addr(); | |
182 } | |
183 } | |
184 } | |
185 } | |
186 | |
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187 bool LoaderConstraintTable::add_entry(Symbol* class_name, |
0 | 188 klassOop klass1, Handle class_loader1, |
189 klassOop klass2, Handle class_loader2) { | |
190 int failure_code = 0; // encode different reasons for failing | |
191 | |
192 if (klass1 != NULL && klass2 != NULL && klass1 != klass2) { | |
193 failure_code = 1; | |
194 } else { | |
195 klassOop klass = klass1 != NULL ? klass1 : klass2; | |
196 | |
197 LoaderConstraintEntry** pp1 = find_loader_constraint(class_name, | |
198 class_loader1); | |
199 if (*pp1 != NULL && (*pp1)->klass() != NULL) { | |
200 if (klass != NULL) { | |
201 if (klass != (*pp1)->klass()) { | |
202 failure_code = 2; | |
203 } | |
204 } else { | |
205 klass = (*pp1)->klass(); | |
206 } | |
207 } | |
208 | |
209 LoaderConstraintEntry** pp2 = find_loader_constraint(class_name, | |
210 class_loader2); | |
211 if (*pp2 != NULL && (*pp2)->klass() != NULL) { | |
212 if (klass != NULL) { | |
213 if (klass != (*pp2)->klass()) { | |
214 failure_code = 3; | |
215 } | |
216 } else { | |
217 klass = (*pp2)->klass(); | |
218 } | |
219 } | |
220 | |
221 if (failure_code == 0) { | |
222 if (*pp1 == NULL && *pp2 == NULL) { | |
223 unsigned int hash = compute_hash(class_name); | |
224 int index = hash_to_index(hash); | |
225 LoaderConstraintEntry* p; | |
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226 p = new_entry(hash, class_name, klass, 2, 2); |
0 | 227 p->set_loaders(NEW_C_HEAP_ARRAY(oop, 2)); |
228 p->set_loader(0, class_loader1()); | |
229 p->set_loader(1, class_loader2()); | |
230 p->set_klass(klass); | |
231 p->set_next(bucket(index)); | |
232 set_entry(index, p); | |
233 if (TraceLoaderConstraints) { | |
234 ResourceMark rm; | |
235 tty->print("[Adding new constraint for name: %s, loader[0]: %s," | |
236 " loader[1]: %s ]\n", | |
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237 class_name->as_C_string(), |
0 | 238 SystemDictionary::loader_name(class_loader1()), |
239 SystemDictionary::loader_name(class_loader2()) | |
240 ); | |
241 } | |
242 } else if (*pp1 == *pp2) { | |
243 /* constraint already imposed */ | |
244 if ((*pp1)->klass() == NULL) { | |
245 (*pp1)->set_klass(klass); | |
246 if (TraceLoaderConstraints) { | |
247 ResourceMark rm; | |
248 tty->print("[Setting class object in existing constraint for" | |
249 " name: %s and loader %s ]\n", | |
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250 class_name->as_C_string(), |
0 | 251 SystemDictionary::loader_name(class_loader1()) |
252 ); | |
253 } | |
254 } else { | |
255 assert((*pp1)->klass() == klass, "loader constraints corrupted"); | |
256 } | |
257 } else if (*pp1 == NULL) { | |
258 extend_loader_constraint(*pp2, class_loader1, klass); | |
259 } else if (*pp2 == NULL) { | |
260 extend_loader_constraint(*pp1, class_loader2, klass); | |
261 } else { | |
262 merge_loader_constraints(pp1, pp2, klass); | |
263 } | |
264 } | |
265 } | |
266 | |
267 if (failure_code != 0 && TraceLoaderConstraints) { | |
268 ResourceMark rm; | |
269 const char* reason = ""; | |
270 switch(failure_code) { | |
271 case 1: reason = "the class objects presented by loader[0] and loader[1]" | |
272 " are different"; break; | |
273 case 2: reason = "the class object presented by loader[0] does not match" | |
274 " the stored class object in the constraint"; break; | |
275 case 3: reason = "the class object presented by loader[1] does not match" | |
276 " the stored class object in the constraint"; break; | |
277 default: reason = "unknown reason code"; | |
278 } | |
279 tty->print("[Failed to add constraint for name: %s, loader[0]: %s," | |
280 " loader[1]: %s, Reason: %s ]\n", | |
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281 class_name->as_C_string(), |
0 | 282 SystemDictionary::loader_name(class_loader1()), |
283 SystemDictionary::loader_name(class_loader2()), | |
284 reason | |
285 ); | |
286 } | |
287 | |
288 return failure_code == 0; | |
289 } | |
290 | |
291 | |
292 // return true if the constraint was updated, false if the constraint is | |
293 // violated | |
294 bool LoaderConstraintTable::check_or_update(instanceKlassHandle k, | |
295 Handle loader, | |
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296 Symbol* name) { |
0 | 297 LoaderConstraintEntry* p = *(find_loader_constraint(name, loader)); |
298 if (p && p->klass() != NULL && p->klass() != k()) { | |
299 if (TraceLoaderConstraints) { | |
300 ResourceMark rm; | |
301 tty->print("[Constraint check failed for name %s, loader %s: " | |
302 "the presented class object differs from that stored ]\n", | |
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303 name->as_C_string(), |
0 | 304 SystemDictionary::loader_name(loader())); |
305 } | |
306 return false; | |
307 } else { | |
308 if (p && p->klass() == NULL) { | |
309 p->set_klass(k()); | |
310 if (TraceLoaderConstraints) { | |
311 ResourceMark rm; | |
312 tty->print("[Updating constraint for name %s, loader %s, " | |
313 "by setting class object ]\n", | |
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314 name->as_C_string(), |
0 | 315 SystemDictionary::loader_name(loader())); |
316 } | |
317 } | |
318 return true; | |
319 } | |
320 } | |
321 | |
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322 klassOop LoaderConstraintTable::find_constrained_klass(Symbol* name, |
0 | 323 Handle loader) { |
324 LoaderConstraintEntry *p = *(find_loader_constraint(name, loader)); | |
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325 if (p != NULL && p->klass() != NULL) { |
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326 if (Klass::cast(p->klass())->oop_is_instance() && !instanceKlass::cast(p->klass())->is_loaded()) { |
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327 // Only return fully loaded classes. Classes found through the |
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328 // constraints might still be in the process of loading. |
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329 return NULL; |
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330 } |
0 | 331 return p->klass(); |
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332 } |
0 | 333 |
334 // No constraints, or else no klass loaded yet. | |
335 return NULL; | |
336 } | |
337 | |
338 void LoaderConstraintTable::ensure_loader_constraint_capacity( | |
339 LoaderConstraintEntry *p, | |
340 int nfree) { | |
341 if (p->max_loaders() - p->num_loaders() < nfree) { | |
342 int n = nfree + p->num_loaders(); | |
343 oop* new_loaders = NEW_C_HEAP_ARRAY(oop, n); | |
344 memcpy(new_loaders, p->loaders(), sizeof(oop) * p->num_loaders()); | |
345 p->set_max_loaders(n); | |
346 FREE_C_HEAP_ARRAY(oop, p->loaders()); | |
347 p->set_loaders(new_loaders); | |
348 } | |
349 } | |
350 | |
351 | |
352 void LoaderConstraintTable::extend_loader_constraint(LoaderConstraintEntry* p, | |
353 Handle loader, | |
354 klassOop klass) { | |
355 ensure_loader_constraint_capacity(p, 1); | |
356 int num = p->num_loaders(); | |
357 p->set_loader(num, loader()); | |
358 p->set_num_loaders(num + 1); | |
359 if (TraceLoaderConstraints) { | |
360 ResourceMark rm; | |
361 tty->print("[Extending constraint for name %s by adding loader[%d]: %s %s", | |
362 p->name()->as_C_string(), | |
363 num, | |
364 SystemDictionary::loader_name(loader()), | |
365 (p->klass() == NULL ? " and setting class object ]\n" : " ]\n") | |
366 ); | |
367 } | |
368 if (p->klass() == NULL) { | |
369 p->set_klass(klass); | |
370 } else { | |
371 assert(klass == NULL || p->klass() == klass, "constraints corrupted"); | |
372 } | |
373 } | |
374 | |
375 | |
376 void LoaderConstraintTable::merge_loader_constraints( | |
377 LoaderConstraintEntry** pp1, | |
378 LoaderConstraintEntry** pp2, | |
379 klassOop klass) { | |
380 // make sure *pp1 has higher capacity | |
381 if ((*pp1)->max_loaders() < (*pp2)->max_loaders()) { | |
382 LoaderConstraintEntry** tmp = pp2; | |
383 pp2 = pp1; | |
384 pp1 = tmp; | |
385 } | |
386 | |
387 LoaderConstraintEntry* p1 = *pp1; | |
388 LoaderConstraintEntry* p2 = *pp2; | |
389 | |
390 ensure_loader_constraint_capacity(p1, p2->num_loaders()); | |
391 | |
392 for (int i = 0; i < p2->num_loaders(); i++) { | |
393 int num = p1->num_loaders(); | |
394 p1->set_loader(num, p2->loader(i)); | |
395 p1->set_num_loaders(num + 1); | |
396 } | |
397 | |
398 if (TraceLoaderConstraints) { | |
399 ResourceMark rm; | |
400 tty->print_cr("[Merged constraints for name %s, new loader list:", | |
401 p1->name()->as_C_string() | |
402 ); | |
403 | |
404 for (int i = 0; i < p1->num_loaders(); i++) { | |
405 tty->print_cr("[ [%d]: %s", i, | |
406 SystemDictionary::loader_name(p1->loader(i))); | |
407 } | |
408 if (p1->klass() == NULL) { | |
409 tty->print_cr("[... and setting class object]"); | |
410 } | |
411 } | |
412 | |
413 // p1->klass() will hold NULL if klass, p2->klass(), and old | |
414 // p1->klass() are all NULL. In addition, all three must have | |
415 // matching non-NULL values, otherwise either the constraints would | |
416 // have been violated, or the constraints had been corrupted (and an | |
417 // assertion would fail). | |
418 if (p2->klass() != NULL) { | |
419 assert(p2->klass() == klass, "constraints corrupted"); | |
420 } | |
421 if (p1->klass() == NULL) { | |
422 p1->set_klass(klass); | |
423 } else { | |
424 assert(p1->klass() == klass, "constraints corrupted"); | |
425 } | |
426 | |
427 *pp2 = p2->next(); | |
428 FREE_C_HEAP_ARRAY(oop, p2->loaders()); | |
429 free_entry(p2); | |
430 return; | |
431 } | |
432 | |
433 | |
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434 void LoaderConstraintTable::verify(Dictionary* dictionary, |
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435 PlaceholderTable* placeholders) { |
0 | 436 Thread *thread = Thread::current(); |
437 for (int cindex = 0; cindex < _loader_constraint_size; cindex++) { | |
438 for (LoaderConstraintEntry* probe = bucket(cindex); | |
439 probe != NULL; | |
440 probe = probe->next()) { | |
441 if (probe->klass() != NULL) { | |
442 instanceKlass* ik = instanceKlass::cast(probe->klass()); | |
443 guarantee(ik->name() == probe->name(), "name should match"); | |
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444 Symbol* name = ik->name(); |
0 | 445 Handle loader(thread, ik->class_loader()); |
446 unsigned int d_hash = dictionary->compute_hash(name, loader); | |
447 int d_index = dictionary->hash_to_index(d_hash); | |
448 klassOop k = dictionary->find_class(d_index, d_hash, name, loader); | |
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449 if (k != NULL) { |
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450 // We found the class in the system dictionary, so we should |
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451 // make sure that the klassOop matches what we already have. |
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452 guarantee(k == probe->klass(), "klass should be in dictionary"); |
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453 } else { |
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454 // If we don't find the class in the system dictionary, it |
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455 // has to be in the placeholders table. |
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456 unsigned int p_hash = placeholders->compute_hash(name, loader); |
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457 int p_index = placeholders->hash_to_index(p_hash); |
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458 PlaceholderEntry* entry = placeholders->get_entry(p_index, p_hash, |
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459 name, loader); |
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460 |
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461 // The instanceKlass might not be on the entry, so the only |
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462 // thing we can check here is whether we were successful in |
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463 // finding the class in the placeholders table. |
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464 guarantee(entry != NULL, "klass should be in the placeholders"); |
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465 } |
0 | 466 } |
467 for (int n = 0; n< probe->num_loaders(); n++) { | |
468 guarantee(probe->loader(n)->is_oop_or_null(), "should be oop"); | |
469 } | |
470 } | |
471 } | |
472 } | |
473 | |
474 #ifndef PRODUCT | |
475 | |
476 // Called with the system dictionary lock held | |
477 void LoaderConstraintTable::print() { | |
478 ResourceMark rm; | |
479 | |
480 assert_locked_or_safepoint(SystemDictionary_lock); | |
481 tty->print_cr("Java loader constraints (entries=%d)", _loader_constraint_size); | |
482 for (int cindex = 0; cindex < _loader_constraint_size; cindex++) { | |
483 for (LoaderConstraintEntry* probe = bucket(cindex); | |
484 probe != NULL; | |
485 probe = probe->next()) { | |
486 tty->print("%4d: ", cindex); | |
487 probe->name()->print(); | |
488 tty->print(" , loaders:"); | |
489 for (int n = 0; n < probe->num_loaders(); n++) { | |
490 probe->loader(n)->print_value(); | |
491 tty->print(", "); | |
492 } | |
493 tty->cr(); | |
494 } | |
495 } | |
496 } | |
497 #endif |