29 #include "runtime/handles.inline.hpp" |
29 #include "runtime/handles.inline.hpp" |
30 #include "runtime/safepoint.hpp" |
30 #include "runtime/safepoint.hpp" |
31 #include "utilities/hashtable.inline.hpp" |
31 #include "utilities/hashtable.inline.hpp" |
32 |
32 |
33 LoaderConstraintTable::LoaderConstraintTable(int nof_buckets) |
33 LoaderConstraintTable::LoaderConstraintTable(int nof_buckets) |
34 : Hashtable(nof_buckets, sizeof(LoaderConstraintEntry)) {}; |
34 : Hashtable<klassOop>(nof_buckets, sizeof(LoaderConstraintEntry)) {}; |
35 |
35 |
36 |
36 |
37 LoaderConstraintEntry* LoaderConstraintTable::new_entry( |
37 LoaderConstraintEntry* LoaderConstraintTable::new_entry( |
38 unsigned int hash, symbolOop name, |
38 unsigned int hash, Symbol* name, |
39 klassOop klass, int num_loaders, |
39 klassOop klass, int num_loaders, |
40 int max_loaders) { |
40 int max_loaders) { |
41 LoaderConstraintEntry* entry; |
41 LoaderConstraintEntry* entry; |
42 entry = (LoaderConstraintEntry*)Hashtable::new_entry(hash, klass); |
42 entry = (LoaderConstraintEntry*)Hashtable<klassOop>::new_entry(hash, klass); |
43 entry->set_name(name); |
43 entry->set_name(name); |
44 entry->set_num_loaders(num_loaders); |
44 entry->set_num_loaders(num_loaders); |
45 entry->set_max_loaders(max_loaders); |
45 entry->set_max_loaders(max_loaders); |
46 return entry; |
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); |
47 } |
53 } |
48 |
54 |
49 |
55 |
50 void LoaderConstraintTable::oops_do(OopClosure* f) { |
56 void LoaderConstraintTable::oops_do(OopClosure* f) { |
51 for (int index = 0; index < table_size(); index++) { |
57 for (int index = 0; index < table_size(); index++) { |
52 for (LoaderConstraintEntry* probe = bucket(index); |
58 for (LoaderConstraintEntry* probe = bucket(index); |
53 probe != NULL; |
59 probe != NULL; |
54 probe = probe->next()) { |
60 probe = probe->next()) { |
55 f->do_oop((oop*)(probe->name_addr())); |
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56 if (probe->klass() != NULL) { |
61 if (probe->klass() != NULL) { |
57 f->do_oop((oop*)probe->klass_addr()); |
62 f->do_oop((oop*)probe->klass_addr()); |
58 } |
63 } |
59 for (int n = 0; n < probe->num_loaders(); n++) { |
64 for (int n = 0; n < probe->num_loaders(); n++) { |
60 if (probe->loader(n) != NULL) { |
65 if (probe->loader(n) != NULL) { |
63 } |
68 } |
64 } |
69 } |
65 } |
70 } |
66 } |
71 } |
67 |
72 |
68 // We must keep the symbolOop used in the name alive. We'll use the |
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69 // loaders to decide if a particular entry can be purged. |
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70 void LoaderConstraintTable::always_strong_classes_do(OopClosure* blk) { |
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71 // We must keep the symbolOop used in the name alive. |
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72 for (int cindex = 0; cindex < table_size(); cindex++) { |
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73 for (LoaderConstraintEntry* lc_probe = bucket(cindex); |
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74 lc_probe != NULL; |
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75 lc_probe = lc_probe->next()) { |
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76 assert (lc_probe->name() != NULL, "corrupted loader constraint table"); |
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77 blk->do_oop((oop*)lc_probe->name_addr()); |
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78 } |
|
79 } |
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80 } |
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81 |
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82 |
73 |
83 // The loaderConstraintTable must always be accessed with the |
74 // The loaderConstraintTable must always be accessed with the |
84 // SystemDictionary lock held. This is true even for readers as |
75 // SystemDictionary lock held. This is true even for readers as |
85 // entries in the table could be being dynamically resized. |
76 // entries in the table could be being dynamically resized. |
86 |
77 |
87 LoaderConstraintEntry** LoaderConstraintTable::find_loader_constraint( |
78 LoaderConstraintEntry** LoaderConstraintTable::find_loader_constraint( |
88 symbolHandle name, Handle loader) { |
79 Symbol* name, Handle loader) { |
89 |
80 |
90 unsigned int hash = compute_hash(name); |
81 unsigned int hash = compute_hash(name); |
91 int index = hash_to_index(hash); |
82 int index = hash_to_index(hash); |
92 LoaderConstraintEntry** pp = bucket_addr(index); |
83 LoaderConstraintEntry** pp = bucket_addr(index); |
93 while (*pp) { |
84 while (*pp) { |
94 LoaderConstraintEntry* p = *pp; |
85 LoaderConstraintEntry* p = *pp; |
95 if (p->hash() == hash) { |
86 if (p->hash() == hash) { |
96 if (p->name() == name()) { |
87 if (p->name() == name) { |
97 for (int i = p->num_loaders() - 1; i >= 0; i--) { |
88 for (int i = p->num_loaders() - 1; i >= 0; i--) { |
98 if (p->loader(i) == loader()) { |
89 if (p->loader(i) == loader()) { |
99 return pp; |
90 return pp; |
100 } |
91 } |
101 } |
92 } |
175 *p = probe->next(); |
166 *p = probe->next(); |
176 FREE_C_HEAP_ARRAY(oop, probe->loaders()); |
167 FREE_C_HEAP_ARRAY(oop, probe->loaders()); |
177 free_entry(probe); |
168 free_entry(probe); |
178 } else { |
169 } else { |
179 #ifdef ASSERT |
170 #ifdef ASSERT |
180 assert(is_alive->do_object_b(probe->name()), "name should be live"); |
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181 if (probe->klass() != NULL) { |
171 if (probe->klass() != NULL) { |
182 assert(is_alive->do_object_b(probe->klass()), "klass should be live"); |
172 assert(is_alive->do_object_b(probe->klass()), "klass should be live"); |
183 } |
173 } |
184 for (n = 0; n < probe->num_loaders(); n++) { |
174 for (n = 0; n < probe->num_loaders(); n++) { |
185 if (probe->loader(n) != NULL) { |
175 if (probe->loader(n) != NULL) { |
192 } |
182 } |
193 } |
183 } |
194 } |
184 } |
195 } |
185 } |
196 |
186 |
197 bool LoaderConstraintTable::add_entry(symbolHandle class_name, |
187 bool LoaderConstraintTable::add_entry(Symbol* class_name, |
198 klassOop klass1, Handle class_loader1, |
188 klassOop klass1, Handle class_loader1, |
199 klassOop klass2, Handle class_loader2) { |
189 klassOop klass2, Handle class_loader2) { |
200 int failure_code = 0; // encode different reasons for failing |
190 int failure_code = 0; // encode different reasons for failing |
201 |
191 |
202 if (klass1 != NULL && klass2 != NULL && klass1 != klass2) { |
192 if (klass1 != NULL && klass2 != NULL && klass1 != klass2) { |
231 if (failure_code == 0) { |
221 if (failure_code == 0) { |
232 if (*pp1 == NULL && *pp2 == NULL) { |
222 if (*pp1 == NULL && *pp2 == NULL) { |
233 unsigned int hash = compute_hash(class_name); |
223 unsigned int hash = compute_hash(class_name); |
234 int index = hash_to_index(hash); |
224 int index = hash_to_index(hash); |
235 LoaderConstraintEntry* p; |
225 LoaderConstraintEntry* p; |
236 p = new_entry(hash, class_name(), klass, 2, 2); |
226 p = new_entry(hash, class_name, klass, 2, 2); |
237 p->set_loaders(NEW_C_HEAP_ARRAY(oop, 2)); |
227 p->set_loaders(NEW_C_HEAP_ARRAY(oop, 2)); |
238 p->set_loader(0, class_loader1()); |
228 p->set_loader(0, class_loader1()); |
239 p->set_loader(1, class_loader2()); |
229 p->set_loader(1, class_loader2()); |
240 p->set_klass(klass); |
230 p->set_klass(klass); |
241 p->set_next(bucket(index)); |
231 p->set_next(bucket(index)); |
242 set_entry(index, p); |
232 set_entry(index, p); |
243 if (TraceLoaderConstraints) { |
233 if (TraceLoaderConstraints) { |
244 ResourceMark rm; |
234 ResourceMark rm; |
245 tty->print("[Adding new constraint for name: %s, loader[0]: %s," |
235 tty->print("[Adding new constraint for name: %s, loader[0]: %s," |
246 " loader[1]: %s ]\n", |
236 " loader[1]: %s ]\n", |
247 class_name()->as_C_string(), |
237 class_name->as_C_string(), |
248 SystemDictionary::loader_name(class_loader1()), |
238 SystemDictionary::loader_name(class_loader1()), |
249 SystemDictionary::loader_name(class_loader2()) |
239 SystemDictionary::loader_name(class_loader2()) |
250 ); |
240 ); |
251 } |
241 } |
252 } else if (*pp1 == *pp2) { |
242 } else if (*pp1 == *pp2) { |
255 (*pp1)->set_klass(klass); |
245 (*pp1)->set_klass(klass); |
256 if (TraceLoaderConstraints) { |
246 if (TraceLoaderConstraints) { |
257 ResourceMark rm; |
247 ResourceMark rm; |
258 tty->print("[Setting class object in existing constraint for" |
248 tty->print("[Setting class object in existing constraint for" |
259 " name: %s and loader %s ]\n", |
249 " name: %s and loader %s ]\n", |
260 class_name()->as_C_string(), |
250 class_name->as_C_string(), |
261 SystemDictionary::loader_name(class_loader1()) |
251 SystemDictionary::loader_name(class_loader1()) |
262 ); |
252 ); |
263 } |
253 } |
264 } else { |
254 } else { |
265 assert((*pp1)->klass() == klass, "loader constraints corrupted"); |
255 assert((*pp1)->klass() == klass, "loader constraints corrupted"); |
286 " the stored class object in the constraint"; break; |
276 " the stored class object in the constraint"; break; |
287 default: reason = "unknown reason code"; |
277 default: reason = "unknown reason code"; |
288 } |
278 } |
289 tty->print("[Failed to add constraint for name: %s, loader[0]: %s," |
279 tty->print("[Failed to add constraint for name: %s, loader[0]: %s," |
290 " loader[1]: %s, Reason: %s ]\n", |
280 " loader[1]: %s, Reason: %s ]\n", |
291 class_name()->as_C_string(), |
281 class_name->as_C_string(), |
292 SystemDictionary::loader_name(class_loader1()), |
282 SystemDictionary::loader_name(class_loader1()), |
293 SystemDictionary::loader_name(class_loader2()), |
283 SystemDictionary::loader_name(class_loader2()), |
294 reason |
284 reason |
295 ); |
285 ); |
296 } |
286 } |
301 |
291 |
302 // return true if the constraint was updated, false if the constraint is |
292 // return true if the constraint was updated, false if the constraint is |
303 // violated |
293 // violated |
304 bool LoaderConstraintTable::check_or_update(instanceKlassHandle k, |
294 bool LoaderConstraintTable::check_or_update(instanceKlassHandle k, |
305 Handle loader, |
295 Handle loader, |
306 symbolHandle name) { |
296 Symbol* name) { |
307 LoaderConstraintEntry* p = *(find_loader_constraint(name, loader)); |
297 LoaderConstraintEntry* p = *(find_loader_constraint(name, loader)); |
308 if (p && p->klass() != NULL && p->klass() != k()) { |
298 if (p && p->klass() != NULL && p->klass() != k()) { |
309 if (TraceLoaderConstraints) { |
299 if (TraceLoaderConstraints) { |
310 ResourceMark rm; |
300 ResourceMark rm; |
311 tty->print("[Constraint check failed for name %s, loader %s: " |
301 tty->print("[Constraint check failed for name %s, loader %s: " |
312 "the presented class object differs from that stored ]\n", |
302 "the presented class object differs from that stored ]\n", |
313 name()->as_C_string(), |
303 name->as_C_string(), |
314 SystemDictionary::loader_name(loader())); |
304 SystemDictionary::loader_name(loader())); |
315 } |
305 } |
316 return false; |
306 return false; |
317 } else { |
307 } else { |
318 if (p && p->klass() == NULL) { |
308 if (p && p->klass() == NULL) { |
319 p->set_klass(k()); |
309 p->set_klass(k()); |
320 if (TraceLoaderConstraints) { |
310 if (TraceLoaderConstraints) { |
321 ResourceMark rm; |
311 ResourceMark rm; |
322 tty->print("[Updating constraint for name %s, loader %s, " |
312 tty->print("[Updating constraint for name %s, loader %s, " |
323 "by setting class object ]\n", |
313 "by setting class object ]\n", |
324 name()->as_C_string(), |
314 name->as_C_string(), |
325 SystemDictionary::loader_name(loader())); |
315 SystemDictionary::loader_name(loader())); |
326 } |
316 } |
327 } |
317 } |
328 return true; |
318 return true; |
329 } |
319 } |
330 } |
320 } |
331 |
321 |
332 klassOop LoaderConstraintTable::find_constrained_klass(symbolHandle name, |
322 klassOop LoaderConstraintTable::find_constrained_klass(Symbol* name, |
333 Handle loader) { |
323 Handle loader) { |
334 LoaderConstraintEntry *p = *(find_loader_constraint(name, loader)); |
324 LoaderConstraintEntry *p = *(find_loader_constraint(name, loader)); |
335 if (p != NULL && p->klass() != NULL) |
325 if (p != NULL && p->klass() != NULL) |
336 return p->klass(); |
326 return p->klass(); |
337 |
327 |
440 Thread *thread = Thread::current(); |
430 Thread *thread = Thread::current(); |
441 for (int cindex = 0; cindex < _loader_constraint_size; cindex++) { |
431 for (int cindex = 0; cindex < _loader_constraint_size; cindex++) { |
442 for (LoaderConstraintEntry* probe = bucket(cindex); |
432 for (LoaderConstraintEntry* probe = bucket(cindex); |
443 probe != NULL; |
433 probe != NULL; |
444 probe = probe->next()) { |
434 probe = probe->next()) { |
445 guarantee(probe->name()->is_symbol(), "should be symbol"); |
|
446 if (probe->klass() != NULL) { |
435 if (probe->klass() != NULL) { |
447 instanceKlass* ik = instanceKlass::cast(probe->klass()); |
436 instanceKlass* ik = instanceKlass::cast(probe->klass()); |
448 guarantee(ik->name() == probe->name(), "name should match"); |
437 guarantee(ik->name() == probe->name(), "name should match"); |
449 symbolHandle name (thread, ik->name()); |
438 Symbol* name = ik->name(); |
450 Handle loader(thread, ik->class_loader()); |
439 Handle loader(thread, ik->class_loader()); |
451 unsigned int d_hash = dictionary->compute_hash(name, loader); |
440 unsigned int d_hash = dictionary->compute_hash(name, loader); |
452 int d_index = dictionary->hash_to_index(d_hash); |
441 int d_index = dictionary->hash_to_index(d_hash); |
453 klassOop k = dictionary->find_class(d_index, d_hash, name, loader); |
442 klassOop k = dictionary->find_class(d_index, d_hash, name, loader); |
454 if (k != NULL) { |
443 if (k != NULL) { |