Mercurial > hg > truffle
annotate src/share/vm/classfile/loaderConstraints.cpp @ 21810:0366a71eda74
8047125: (ref) More phantom object references
Reviewed-by: mchung, dfuchs, ahgross, jmasa, brutisso, mgerdin
Contributed-by: kim.barrett@oracle.com
| author | jmasa |
|---|---|
| date | Fri, 26 Sep 2014 17:48:10 -0400 |
| parents | 90273fc0a981 |
| children |
| rev | line source |
|---|---|
| 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 |