Mercurial > hg > truffle
annotate src/share/vm/classfile/loaderConstraints.cpp @ 16704:3cd605c98060
NFI: cleanup
author | Matthias Grimmer <grimmer@ssw.jku.at> |
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date | Wed, 06 Aug 2014 08:27:42 +0200 |
parents | 90273fc0a981 |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 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" |
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26 #include "classfile/classLoaderData.inline.hpp" |
1972 | 27 #include "classfile/loaderConstraints.hpp" |
28 #include "memory/resourceArea.hpp" | |
29 #include "oops/oop.inline.hpp" | |
30 #include "runtime/handles.inline.hpp" | |
31 #include "runtime/safepoint.hpp" | |
32 #include "utilities/hashtable.inline.hpp" | |
0 | 33 |
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34 void LoaderConstraintEntry::set_loader(int i, oop p) { |
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35 set_loader_data(i, ClassLoaderData::class_loader_data(p)); |
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36 } |
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37 |
0 | 38 LoaderConstraintTable::LoaderConstraintTable(int nof_buckets) |
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39 : Hashtable<Klass*, mtClass>(nof_buckets, sizeof(LoaderConstraintEntry)) {}; |
0 | 40 |
41 | |
42 LoaderConstraintEntry* LoaderConstraintTable::new_entry( | |
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43 unsigned int hash, Symbol* name, |
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44 Klass* klass, int num_loaders, |
0 | 45 int max_loaders) { |
46 LoaderConstraintEntry* entry; | |
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47 entry = (LoaderConstraintEntry*)Hashtable<Klass*, mtClass>::new_entry(hash, klass); |
0 | 48 entry->set_name(name); |
49 entry->set_num_loaders(num_loaders); | |
50 entry->set_max_loaders(max_loaders); | |
51 return entry; | |
52 } | |
53 | |
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54 void LoaderConstraintTable::free_entry(LoaderConstraintEntry *entry) { |
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55 // decrement name refcount before freeing |
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56 entry->name()->decrement_refcount(); |
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57 Hashtable<Klass*, mtClass>::free_entry(entry); |
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58 } |
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59 |
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60 // Enhanced Class Redefinition support |
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61 void LoaderConstraintTable::classes_do(KlassClosure* f) { |
0 | 62 for (int index = 0; index < table_size(); index++) { |
63 for (LoaderConstraintEntry* probe = bucket(index); | |
64 probe != NULL; | |
65 probe = probe->next()) { | |
66 if (probe->klass() != NULL) { | |
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67 f->do_klass(probe->klass()); |
0 | 68 } |
69 } | |
70 } | |
71 } | |
72 | |
73 // The loaderConstraintTable must always be accessed with the | |
74 // SystemDictionary lock held. This is true even for readers as | |
75 // entries in the table could be being dynamically resized. | |
76 | |
77 LoaderConstraintEntry** LoaderConstraintTable::find_loader_constraint( | |
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78 Symbol* name, Handle loader) { |
0 | 79 |
80 unsigned int hash = compute_hash(name); | |
81 int index = hash_to_index(hash); | |
82 LoaderConstraintEntry** pp = bucket_addr(index); | |
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83 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(loader()); |
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84 |
0 | 85 while (*pp) { |
86 LoaderConstraintEntry* p = *pp; | |
87 if (p->hash() == hash) { | |
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88 if (p->name() == name) { |
0 | 89 for (int i = p->num_loaders() - 1; i >= 0; i--) { |
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90 if (p->loader_data(i) == loader_data) { |
0 | 91 return pp; |
92 } | |
93 } | |
94 } | |
95 } | |
96 pp = p->next_addr(); | |
97 } | |
98 return pp; | |
99 } | |
100 | |
101 | |
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102 void LoaderConstraintTable::purge_loader_constraints() { |
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103 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
0 | 104 // Remove unloaded entries from constraint table |
105 for (int index = 0; index < table_size(); index++) { | |
106 LoaderConstraintEntry** p = bucket_addr(index); | |
107 while(*p) { | |
108 LoaderConstraintEntry* probe = *p; | |
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109 Klass* klass = probe->klass(); |
0 | 110 // Remove klass that is no longer alive |
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111 if (klass != NULL && |
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112 klass->class_loader_data()->is_unloading()) { |
0 | 113 probe->set_klass(NULL); |
114 if (TraceLoaderConstraints) { | |
115 ResourceMark rm; | |
116 tty->print_cr("[Purging class object from constraint for name %s," | |
117 " loader list:", | |
118 probe->name()->as_C_string()); | |
119 for (int i = 0; i < probe->num_loaders(); i++) { | |
120 tty->print_cr("[ [%d]: %s", i, | |
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121 probe->loader_data(i)->loader_name()); |
0 | 122 } |
123 } | |
124 } | |
125 // Remove entries no longer alive from loader array | |
126 int n = 0; | |
127 while (n < probe->num_loaders()) { | |
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128 if (probe->loader_data(n)->is_unloading()) { |
0 | 129 if (TraceLoaderConstraints) { |
130 ResourceMark rm; | |
131 tty->print_cr("[Purging loader %s from constraint for name %s", | |
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132 probe->loader_data(n)->loader_name(), |
0 | 133 probe->name()->as_C_string() |
134 ); | |
135 } | |
136 | |
137 // Compact array | |
138 int num = probe->num_loaders() - 1; | |
139 probe->set_num_loaders(num); | |
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140 probe->set_loader_data(n, probe->loader_data(num)); |
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141 probe->set_loader_data(num, NULL); |
0 | 142 |
143 if (TraceLoaderConstraints) { | |
144 ResourceMark rm; | |
145 tty->print_cr("[New loader list:"); | |
146 for (int i = 0; i < probe->num_loaders(); i++) { | |
147 tty->print_cr("[ [%d]: %s", i, | |
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148 probe->loader_data(i)->loader_name()); |
0 | 149 } |
150 } | |
151 | |
152 continue; // current element replaced, so restart without | |
153 // incrementing n | |
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(); | |
6197 | 167 FREE_C_HEAP_ARRAY(oop, probe->loaders(), mtClass); |
0 | 168 free_entry(probe); |
169 } else { | |
170 #ifdef ASSERT | |
171 if (probe->klass() != NULL) { | |
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172 ClassLoaderData* loader_data = |
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173 probe->klass()->class_loader_data(); |
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174 assert(!loader_data->is_unloading(), "klass should be live"); |
0 | 175 } |
176 #endif | |
177 // Go to next entry | |
178 p = probe->next_addr(); | |
179 } | |
180 } | |
181 } | |
182 } | |
183 | |
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184 bool LoaderConstraintTable::add_entry(Symbol* class_name, |
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185 Klass* klass1, Handle class_loader1, |
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186 Klass* klass2, Handle class_loader2) { |
0 | 187 int failure_code = 0; // encode different reasons for failing |
188 | |
189 if (klass1 != NULL && klass2 != NULL && klass1 != klass2) { | |
190 failure_code = 1; | |
191 } else { | |
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192 Klass* klass = klass1 != NULL ? klass1 : klass2; |
0 | 193 |
194 LoaderConstraintEntry** pp1 = find_loader_constraint(class_name, | |
195 class_loader1); | |
196 if (*pp1 != NULL && (*pp1)->klass() != NULL) { | |
197 if (klass != NULL) { | |
198 if (klass != (*pp1)->klass()) { | |
199 failure_code = 2; | |
200 } | |
201 } else { | |
202 klass = (*pp1)->klass(); | |
203 } | |
204 } | |
205 | |
206 LoaderConstraintEntry** pp2 = find_loader_constraint(class_name, | |
207 class_loader2); | |
208 if (*pp2 != NULL && (*pp2)->klass() != NULL) { | |
209 if (klass != NULL) { | |
210 if (klass != (*pp2)->klass()) { | |
211 failure_code = 3; | |
212 } | |
213 } else { | |
214 klass = (*pp2)->klass(); | |
215 } | |
216 } | |
217 | |
218 if (failure_code == 0) { | |
219 if (*pp1 == NULL && *pp2 == NULL) { | |
220 unsigned int hash = compute_hash(class_name); | |
221 int index = hash_to_index(hash); | |
222 LoaderConstraintEntry* p; | |
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223 p = new_entry(hash, class_name, klass, 2, 2); |
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224 p->set_loaders(NEW_C_HEAP_ARRAY(ClassLoaderData*, 2, mtClass)); |
0 | 225 p->set_loader(0, class_loader1()); |
226 p->set_loader(1, class_loader2()); | |
227 p->set_klass(klass); | |
228 p->set_next(bucket(index)); | |
229 set_entry(index, p); | |
230 if (TraceLoaderConstraints) { | |
231 ResourceMark rm; | |
232 tty->print("[Adding new constraint for name: %s, loader[0]: %s," | |
233 " loader[1]: %s ]\n", | |
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234 class_name->as_C_string(), |
0 | 235 SystemDictionary::loader_name(class_loader1()), |
236 SystemDictionary::loader_name(class_loader2()) | |
237 ); | |
238 } | |
239 } else if (*pp1 == *pp2) { | |
240 /* constraint already imposed */ | |
241 if ((*pp1)->klass() == NULL) { | |
242 (*pp1)->set_klass(klass); | |
243 if (TraceLoaderConstraints) { | |
244 ResourceMark rm; | |
245 tty->print("[Setting class object in existing constraint for" | |
246 " name: %s and loader %s ]\n", | |
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247 class_name->as_C_string(), |
0 | 248 SystemDictionary::loader_name(class_loader1()) |
249 ); | |
250 } | |
251 } else { | |
252 assert((*pp1)->klass() == klass, "loader constraints corrupted"); | |
253 } | |
254 } else if (*pp1 == NULL) { | |
255 extend_loader_constraint(*pp2, class_loader1, klass); | |
256 } else if (*pp2 == NULL) { | |
257 extend_loader_constraint(*pp1, class_loader2, klass); | |
258 } else { | |
259 merge_loader_constraints(pp1, pp2, klass); | |
260 } | |
261 } | |
262 } | |
263 | |
264 if (failure_code != 0 && TraceLoaderConstraints) { | |
265 ResourceMark rm; | |
266 const char* reason = ""; | |
267 switch(failure_code) { | |
268 case 1: reason = "the class objects presented by loader[0] and loader[1]" | |
269 " are different"; break; | |
270 case 2: reason = "the class object presented by loader[0] does not match" | |
271 " the stored class object in the constraint"; break; | |
272 case 3: reason = "the class object presented by loader[1] does not match" | |
273 " the stored class object in the constraint"; break; | |
274 default: reason = "unknown reason code"; | |
275 } | |
276 tty->print("[Failed to add constraint for name: %s, loader[0]: %s," | |
277 " loader[1]: %s, Reason: %s ]\n", | |
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278 class_name->as_C_string(), |
0 | 279 SystemDictionary::loader_name(class_loader1()), |
280 SystemDictionary::loader_name(class_loader2()), | |
281 reason | |
282 ); | |
283 } | |
284 | |
285 return failure_code == 0; | |
286 } | |
287 | |
288 | |
289 // return true if the constraint was updated, false if the constraint is | |
290 // violated | |
291 bool LoaderConstraintTable::check_or_update(instanceKlassHandle k, | |
292 Handle loader, | |
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293 Symbol* name) { |
0 | 294 LoaderConstraintEntry* p = *(find_loader_constraint(name, loader)); |
295 if (p && p->klass() != NULL && p->klass() != k()) { | |
296 if (TraceLoaderConstraints) { | |
297 ResourceMark rm; | |
298 tty->print("[Constraint check failed for name %s, loader %s: " | |
299 "the presented class object differs from that stored ]\n", | |
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300 name->as_C_string(), |
0 | 301 SystemDictionary::loader_name(loader())); |
302 } | |
303 return false; | |
304 } else { | |
305 if (p && p->klass() == NULL) { | |
306 p->set_klass(k()); | |
307 if (TraceLoaderConstraints) { | |
308 ResourceMark rm; | |
309 tty->print("[Updating constraint for name %s, loader %s, " | |
310 "by setting class object ]\n", | |
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311 name->as_C_string(), |
0 | 312 SystemDictionary::loader_name(loader())); |
313 } | |
314 } | |
315 return true; | |
316 } | |
317 } | |
318 | |
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319 Klass* LoaderConstraintTable::find_constrained_klass(Symbol* name, |
0 | 320 Handle loader) { |
321 LoaderConstraintEntry *p = *(find_loader_constraint(name, loader)); | |
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322 if (p != NULL && p->klass() != NULL) { |
6983 | 323 if (p->klass()->oop_is_instance() && !InstanceKlass::cast(p->klass())->is_loaded()) { |
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324 // Only return fully loaded classes. Classes found through the |
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325 // constraints might still be in the process of loading. |
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326 return NULL; |
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327 } |
0 | 328 return p->klass(); |
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329 } |
0 | 330 |
331 // No constraints, or else no klass loaded yet. | |
332 return NULL; | |
333 } | |
334 | |
335 void LoaderConstraintTable::ensure_loader_constraint_capacity( | |
336 LoaderConstraintEntry *p, | |
337 int nfree) { | |
338 if (p->max_loaders() - p->num_loaders() < nfree) { | |
339 int n = nfree + p->num_loaders(); | |
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340 ClassLoaderData** new_loaders = NEW_C_HEAP_ARRAY(ClassLoaderData*, n, mtClass); |
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341 memcpy(new_loaders, p->loaders(), sizeof(ClassLoaderData*) * p->num_loaders()); |
0 | 342 p->set_max_loaders(n); |
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343 FREE_C_HEAP_ARRAY(ClassLoaderData*, p->loaders(), mtClass); |
0 | 344 p->set_loaders(new_loaders); |
345 } | |
346 } | |
347 | |
348 | |
349 void LoaderConstraintTable::extend_loader_constraint(LoaderConstraintEntry* p, | |
350 Handle loader, | |
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351 Klass* klass) { |
0 | 352 ensure_loader_constraint_capacity(p, 1); |
353 int num = p->num_loaders(); | |
354 p->set_loader(num, loader()); | |
355 p->set_num_loaders(num + 1); | |
356 if (TraceLoaderConstraints) { | |
357 ResourceMark rm; | |
358 tty->print("[Extending constraint for name %s by adding loader[%d]: %s %s", | |
359 p->name()->as_C_string(), | |
360 num, | |
361 SystemDictionary::loader_name(loader()), | |
362 (p->klass() == NULL ? " and setting class object ]\n" : " ]\n") | |
363 ); | |
364 } | |
365 if (p->klass() == NULL) { | |
366 p->set_klass(klass); | |
367 } else { | |
368 assert(klass == NULL || p->klass() == klass, "constraints corrupted"); | |
369 } | |
370 } | |
371 | |
372 | |
373 void LoaderConstraintTable::merge_loader_constraints( | |
374 LoaderConstraintEntry** pp1, | |
375 LoaderConstraintEntry** pp2, | |
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376 Klass* klass) { |
0 | 377 // make sure *pp1 has higher capacity |
378 if ((*pp1)->max_loaders() < (*pp2)->max_loaders()) { | |
379 LoaderConstraintEntry** tmp = pp2; | |
380 pp2 = pp1; | |
381 pp1 = tmp; | |
382 } | |
383 | |
384 LoaderConstraintEntry* p1 = *pp1; | |
385 LoaderConstraintEntry* p2 = *pp2; | |
386 | |
387 ensure_loader_constraint_capacity(p1, p2->num_loaders()); | |
388 | |
389 for (int i = 0; i < p2->num_loaders(); i++) { | |
390 int num = p1->num_loaders(); | |
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391 p1->set_loader_data(num, p2->loader_data(i)); |
0 | 392 p1->set_num_loaders(num + 1); |
393 } | |
394 | |
395 if (TraceLoaderConstraints) { | |
396 ResourceMark rm; | |
397 tty->print_cr("[Merged constraints for name %s, new loader list:", | |
398 p1->name()->as_C_string() | |
399 ); | |
400 | |
401 for (int i = 0; i < p1->num_loaders(); i++) { | |
402 tty->print_cr("[ [%d]: %s", i, | |
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403 p1->loader_data(i)->loader_name()); |
0 | 404 } |
405 if (p1->klass() == NULL) { | |
406 tty->print_cr("[... and setting class object]"); | |
407 } | |
408 } | |
409 | |
410 // p1->klass() will hold NULL if klass, p2->klass(), and old | |
411 // p1->klass() are all NULL. In addition, all three must have | |
412 // matching non-NULL values, otherwise either the constraints would | |
413 // have been violated, or the constraints had been corrupted (and an | |
414 // assertion would fail). | |
415 if (p2->klass() != NULL) { | |
416 assert(p2->klass() == klass, "constraints corrupted"); | |
417 } | |
418 if (p1->klass() == NULL) { | |
419 p1->set_klass(klass); | |
420 } else { | |
421 assert(p1->klass() == klass, "constraints corrupted"); | |
422 } | |
423 | |
424 *pp2 = p2->next(); | |
6197 | 425 FREE_C_HEAP_ARRAY(oop, p2->loaders(), mtClass); |
0 | 426 free_entry(p2); |
427 return; | |
428 } | |
429 | |
430 | |
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431 void LoaderConstraintTable::verify(Dictionary* dictionary, |
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432 PlaceholderTable* placeholders) { |
0 | 433 Thread *thread = Thread::current(); |
434 for (int cindex = 0; cindex < _loader_constraint_size; cindex++) { | |
435 for (LoaderConstraintEntry* probe = bucket(cindex); | |
436 probe != NULL; | |
437 probe = probe->next()) { | |
438 if (probe->klass() != NULL) { | |
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439 InstanceKlass* ik = InstanceKlass::cast(probe->klass()); |
0 | 440 guarantee(ik->name() == probe->name(), "name should match"); |
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441 Symbol* name = ik->name(); |
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442 ClassLoaderData* loader_data = ik->class_loader_data(); |
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443 unsigned int d_hash = dictionary->compute_hash(name, loader_data); |
0 | 444 int d_index = dictionary->hash_to_index(d_hash); |
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445 Klass* k = dictionary->find_class(d_index, d_hash, name, loader_data); |
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446 if (k != NULL) { |
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447 // We found the class in the system dictionary, so we should |
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448 // make sure that the Klass* matches what we already have. |
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449 guarantee(k == probe->klass(), "klass should be in dictionary"); |
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450 } else { |
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451 // If we don't find the class in the system dictionary, it |
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452 // has to be in the placeholders table. |
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453 unsigned int p_hash = placeholders->compute_hash(name, loader_data); |
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454 int p_index = placeholders->hash_to_index(p_hash); |
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455 PlaceholderEntry* entry = placeholders->get_entry(p_index, p_hash, |
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456 name, loader_data); |
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457 |
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458 // The InstanceKlass might not be on the entry, so the only |
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459 // thing we can check here is whether we were successful in |
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460 // finding the class in the placeholders table. |
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461 guarantee(entry != NULL, "klass should be in the placeholders"); |
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462 } |
0 | 463 } |
464 for (int n = 0; n< probe->num_loaders(); n++) { | |
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465 assert(ClassLoaderDataGraph::contains_loader_data(probe->loader_data(n)), "The loader is missing"); |
0 | 466 } |
467 } | |
468 } | |
469 } | |
470 | |
471 #ifndef PRODUCT | |
472 | |
473 // Called with the system dictionary lock held | |
474 void LoaderConstraintTable::print() { | |
475 ResourceMark rm; | |
476 | |
477 assert_locked_or_safepoint(SystemDictionary_lock); | |
478 tty->print_cr("Java loader constraints (entries=%d)", _loader_constraint_size); | |
479 for (int cindex = 0; cindex < _loader_constraint_size; cindex++) { | |
480 for (LoaderConstraintEntry* probe = bucket(cindex); | |
481 probe != NULL; | |
482 probe = probe->next()) { | |
483 tty->print("%4d: ", cindex); | |
484 probe->name()->print(); | |
485 tty->print(" , loaders:"); | |
486 for (int n = 0; n < probe->num_loaders(); n++) { | |
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487 probe->loader_data(n)->print_value(); |
0 | 488 tty->print(", "); |
489 } | |
490 tty->cr(); | |
491 } | |
492 } | |
493 } | |
494 #endif |