1 /*
2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_CLASSFILE_DICTIONARY_HPP
26 #define SHARE_VM_CLASSFILE_DICTIONARY_HPP
27
28 #include "classfile/systemDictionary.hpp"
29 #include "oops/instanceKlass.hpp"
30 #include "oops/oop.hpp"
31 #include "utilities/hashtable.hpp"
32
33 class DictionaryEntry;
34 class PSPromotionManager;
35
36 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
37 // The data structure for the system dictionary (and the shared system
38 // dictionary).
39
40 class Dictionary : public TwoOopHashtable<Klass*, mtClass> {
41 friend class VMStructs;
42 private:
43 // current iteration index.
44 static int _current_class_index;
45 // pointer to the current hash table entry.
46 static DictionaryEntry* _current_class_entry;
47
48 DictionaryEntry* get_entry(int index, unsigned int hash,
49 Symbol* name, ClassLoaderData* loader_data);
50
51 DictionaryEntry* bucket(int i) {
52 return (DictionaryEntry*)Hashtable<Klass*, mtClass>::bucket(i);
53 }
54
55 // The following method is not MT-safe and must be done under lock.
56 DictionaryEntry** bucket_addr(int i) {
57 return (DictionaryEntry**)Hashtable<Klass*, mtClass>::bucket_addr(i);
58 }
59
60 void add_entry(int index, DictionaryEntry* new_entry) {
61 Hashtable<Klass*, mtClass>::add_entry(index, (HashtableEntry<Klass*, mtClass>*)new_entry);
62 }
63
64 public:
65 Dictionary(int table_size);
66 Dictionary(int table_size, HashtableBucket<mtClass>* t, int number_of_entries);
67
101 return (loader_data->is_the_null_class_loader_data() || !ClassUnloading);
102 }
103
104 // Unload (that is, break root links to) all unmarked classes and
105 // loaders. Returns "true" iff something was unloaded.
106 bool do_unloading();
107
108 // Protection domains
109 Klass* find(int index, unsigned int hash, Symbol* name,
110 ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
111 bool is_valid_protection_domain(int index, unsigned int hash,
112 Symbol* name, ClassLoaderData* loader_data,
113 Handle protection_domain);
114 void add_protection_domain(int index, unsigned int hash,
115 instanceKlassHandle klass, ClassLoaderData* loader_data,
116 Handle protection_domain, TRAPS);
117
118 // Sharing support
119 void reorder_dictionary();
120
121
122 #ifndef PRODUCT
123 void print();
124 #endif
125 void verify();
126 };
127
128 // The following classes can be in dictionary.cpp, but we need these
129 // to be in header file so that SA's vmStructs can access.
130
131 class ProtectionDomainEntry :public CHeapObj<mtClass> {
132 friend class VMStructs;
133 public:
134 ProtectionDomainEntry* _next;
135 oop _protection_domain;
136
137 ProtectionDomainEntry(oop protection_domain, ProtectionDomainEntry* next) {
138 _protection_domain = protection_domain;
139 _next = next;
140 }
141
142 ProtectionDomainEntry* next() { return _next; }
143 oop protection_domain() { return _protection_domain; }
144 };
145
146 // An entry in the system dictionary, this describes a class as
147 // { Klass*, loader, protection_domain }.
148
149 class DictionaryEntry : public HashtableEntry<Klass*, mtClass> {
150 friend class VMStructs;
151 private:
152 // Contains the set of approved protection domains that can access
153 // this system dictionary entry.
154 ProtectionDomainEntry* _pd_set;
155 ClassLoaderData* _loader_data;
156
157 public:
158 // Tells whether a protection is in the approved set.
159 bool contains_protection_domain(oop protection_domain) const;
160 // Adds a protection domain to the approved set.
161 void add_protection_domain(oop protection_domain);
162
163 Klass* klass() const { return (Klass*)literal(); }
164 Klass** klass_addr() { return (Klass**)literal_addr(); }
165
166 DictionaryEntry* next() const {
167 return (DictionaryEntry*)HashtableEntry<Klass*, mtClass>::next();
168 }
169
170 DictionaryEntry** next_addr() {
171 return (DictionaryEntry**)HashtableEntry<Klass*, mtClass>::next_addr();
172 }
173
174 ClassLoaderData* loader_data() const { return _loader_data; }
175 void set_loader_data(ClassLoaderData* loader_data) { _loader_data = loader_data; }
176
177 ProtectionDomainEntry* pd_set() const { return _pd_set; }
178 void set_pd_set(ProtectionDomainEntry* pd_set) { _pd_set = pd_set; }
179
180 bool has_protection_domain() { return _pd_set != NULL; }
181
182 // Tells whether the initiating class' protection can access the this _klass
183 bool is_valid_protection_domain(Handle protection_domain) {
184 if (!ProtectionDomainVerification) return true;
185 if (!SystemDictionary::has_checkPackageAccess()) return true;
186
187 return protection_domain() == NULL
188 ? true
189 : contains_protection_domain(protection_domain());
190 }
191
192
193 void protection_domain_set_oops_do(OopClosure* f) {
194 for (ProtectionDomainEntry* current = _pd_set;
195 current != NULL;
196 current = current->_next) {
197 f->do_oop(&(current->_protection_domain));
198 }
199 }
200
201 void verify_protection_domain_set() {
202 for (ProtectionDomainEntry* current = _pd_set;
203 current != NULL;
204 current = current->_next) {
205 current->_protection_domain->verify();
206 }
207 }
208
209 bool equals(Symbol* class_name, ClassLoaderData* loader_data) const {
210 Klass* klass = (Klass*)literal();
211 return (InstanceKlass::cast(klass)->name() == class_name &&
212 _loader_data == loader_data);
213 }
214
215 void print() {
216 int count = 0;
217 for (ProtectionDomainEntry* current = _pd_set;
218 current != NULL;
219 current = current->_next) {
220 count++;
221 }
222 tty->print_cr("pd set = #%d", count);
223 }
224 };
225
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1 /*
2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_CLASSFILE_DICTIONARY_HPP
26 #define SHARE_VM_CLASSFILE_DICTIONARY_HPP
27
28 #include "classfile/systemDictionary.hpp"
29 #include "oops/instanceKlass.hpp"
30 #include "oops/oop.inline.hpp"
31 #include "utilities/hashtable.hpp"
32
33 class DictionaryEntry;
34 class PSPromotionManager;
35 class ProtectionDomainCacheTable;
36 class ProtectionDomainCacheEntry;
37
38 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
39 // The data structure for the system dictionary (and the shared system
40 // dictionary).
41
42 class Dictionary : public TwoOopHashtable<Klass*, mtClass> {
43 friend class VMStructs;
44 private:
45 // current iteration index.
46 static int _current_class_index;
47 // pointer to the current hash table entry.
48 static DictionaryEntry* _current_class_entry;
49
50 ProtectionDomainCacheTable* _pd_cache_table;
51
52 DictionaryEntry* get_entry(int index, unsigned int hash,
53 Symbol* name, ClassLoaderData* loader_data);
54
55 DictionaryEntry* bucket(int i) {
56 return (DictionaryEntry*)Hashtable<Klass*, mtClass>::bucket(i);
57 }
58
59 // The following method is not MT-safe and must be done under lock.
60 DictionaryEntry** bucket_addr(int i) {
61 return (DictionaryEntry**)Hashtable<Klass*, mtClass>::bucket_addr(i);
62 }
63
64 void add_entry(int index, DictionaryEntry* new_entry) {
65 Hashtable<Klass*, mtClass>::add_entry(index, (HashtableEntry<Klass*, mtClass>*)new_entry);
66 }
67
68 public:
69 Dictionary(int table_size);
70 Dictionary(int table_size, HashtableBucket<mtClass>* t, int number_of_entries);
71
105 return (loader_data->is_the_null_class_loader_data() || !ClassUnloading);
106 }
107
108 // Unload (that is, break root links to) all unmarked classes and
109 // loaders. Returns "true" iff something was unloaded.
110 bool do_unloading();
111
112 // Protection domains
113 Klass* find(int index, unsigned int hash, Symbol* name,
114 ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
115 bool is_valid_protection_domain(int index, unsigned int hash,
116 Symbol* name, ClassLoaderData* loader_data,
117 Handle protection_domain);
118 void add_protection_domain(int index, unsigned int hash,
119 instanceKlassHandle klass, ClassLoaderData* loader_data,
120 Handle protection_domain, TRAPS);
121
122 // Sharing support
123 void reorder_dictionary();
124
125 ProtectionDomainCacheEntry* cache_get(oop protection_domain);
126
127 #ifndef PRODUCT
128 void print();
129 #endif
130 void verify();
131 };
132
133 // The following classes can be in dictionary.cpp, but we need these
134 // to be in header file so that SA's vmStructs can access them.
135 class ProtectionDomainCacheEntry : public HashtableEntry<oop, mtClass> {
136 friend class VMStructs;
137 private:
138 // the number of system dictionary entries referring to this entry
139 int _refcount;
140 // flag indicating whether this protection domain entry is strongly reachable.
141 // Used during iterating over the system dictionary to remember oops that need
142 // to be updated.
143 bool _strongly_reachable;
144 public:
145 oop protection_domain() { return literal(); }
146
147 void increment_refcount() {
148 assert(_refcount >= 0, "sanity");
149 _refcount++;
150 }
151
152 int refcount() { return _refcount; }
153 int decrement_refcount() {
154 assert(_refcount > 0, "sanity");
155 _refcount--;
156 return _refcount;
157 }
158
159 void init() {
160 _refcount = 0;
161 _strongly_reachable = false;
162 }
163
164 ProtectionDomainCacheEntry* next() {
165 return (ProtectionDomainCacheEntry*)HashtableEntry<oop, mtClass>::next();
166 }
167
168 ProtectionDomainCacheEntry** next_addr() {
169 return (ProtectionDomainCacheEntry**)HashtableEntry<oop, mtClass>::next_addr();
170 }
171
172 void oops_do(OopClosure* f) {
173 f->do_oop(literal_addr());
174 }
175
176 void set_strongly_reachable() { _strongly_reachable = true; }
177
178 bool is_strongly_reachable() { return _strongly_reachable; }
179
180 void reset_strongly_reachable() { _strongly_reachable = false; }
181
182 void print() PRODUCT_RETURN;
183 void verify();
184 };
185
186 // the ProtectionDomainCacheTable contains all protection domain oops. The system
187 // dictionary entries reference its entries instead of having references to oops
188 // directly.
189 // This is used to speed up system dictionary iteration: the oops in the
190 // protection domain are the only ones referring the Java heap. So when there is
191 // need to update these, instead of going over every entry of the system dictionary,
192 // we only need to iterate over this set.
193 // The amount of different protection domains used is typically magnitudes smaller
194 // than the number of system dictionary entries (loaded classes).
195 class ProtectionDomainCacheTable : public Hashtable<oop, mtClass> {
196 friend class VMStructs;
197 private:
198 ProtectionDomainCacheEntry* bucket(int i) {
199 return (ProtectionDomainCacheEntry*) Hashtable<oop, mtClass>::bucket(i);
200 }
201
202 // The following method is not MT-safe and must be done under lock.
203 ProtectionDomainCacheEntry** bucket_addr(int i) {
204 return (ProtectionDomainCacheEntry**) Hashtable<oop, mtClass>::bucket_addr(i);
205 }
206
207 ProtectionDomainCacheEntry* new_entry(unsigned int hash, oop protection_domain) {
208 ProtectionDomainCacheEntry* entry = (ProtectionDomainCacheEntry*) Hashtable<oop, mtClass>::new_entry(hash, protection_domain);
209 entry->init();
210 return entry;
211 }
212
213 static unsigned int compute_hash(oop protection_domain) {
214 return (unsigned int)(protection_domain->identity_hash());
215 }
216
217 int index_for(oop protection_domain) {
218 return hash_to_index(compute_hash(protection_domain));
219 }
220
221 ProtectionDomainCacheEntry* add_entry(int index, unsigned int hash, oop protection_domain);
222 ProtectionDomainCacheEntry* find_entry(int index, oop protection_domain);
223
224 public:
225
226 ProtectionDomainCacheTable(int table_size);
227
228 ProtectionDomainCacheEntry* get(oop protection_domain);
229 void free(ProtectionDomainCacheEntry* entry);
230
231 // GC support
232 void oops_do(OopClosure* f);
233 void always_strong_oops_do(OopClosure* f);
234
235 static uint bucket_size();
236
237 void print() PRODUCT_RETURN;
238 void verify();
239 };
240
241
242 class ProtectionDomainEntry :public CHeapObj<mtClass> {
243 friend class VMStructs;
244 public:
245 ProtectionDomainEntry* _next;
246 ProtectionDomainCacheEntry* _pd_cache;
247
248 ProtectionDomainEntry(ProtectionDomainCacheEntry* pd_cache, ProtectionDomainEntry* next) {
249 _pd_cache = pd_cache;
250 _next = next;
251 _pd_cache->increment_refcount();
252 }
253
254 ProtectionDomainEntry* next() { return _next; }
255 oop protection_domain() { return _pd_cache->protection_domain(); }
256
257 ProtectionDomainCacheEntry * release_pd_cache() {
258 if (_pd_cache->decrement_refcount() == 0) {
259 return _pd_cache;
260 } else {
261 return NULL;
262 }
263 }
264 };
265
266 // An entry in the system dictionary, this describes a class as
267 // { Klass*, loader, protection_domain }.
268
269 class DictionaryEntry : public HashtableEntry<Klass*, mtClass> {
270 friend class VMStructs;
271 private:
272 // Contains the set of approved protection domains that can access
273 // this system dictionary entry.
274 ProtectionDomainEntry* _pd_set;
275 ClassLoaderData* _loader_data;
276
277 public:
278 // Tells whether a protection is in the approved set.
279 bool contains_protection_domain(oop protection_domain) const;
280 // Adds a protection domain to the approved set.
281 void add_protection_domain(Dictionary* dict, oop protection_domain);
282
283 Klass* klass() const { return (Klass*)literal(); }
284 Klass** klass_addr() { return (Klass**)literal_addr(); }
285
286 DictionaryEntry* next() const {
287 return (DictionaryEntry*)HashtableEntry<Klass*, mtClass>::next();
288 }
289
290 DictionaryEntry** next_addr() {
291 return (DictionaryEntry**)HashtableEntry<Klass*, mtClass>::next_addr();
292 }
293
294 ClassLoaderData* loader_data() const { return _loader_data; }
295 void set_loader_data(ClassLoaderData* loader_data) { _loader_data = loader_data; }
296
297 ProtectionDomainEntry* pd_set() const { return _pd_set; }
298 void set_pd_set(ProtectionDomainEntry* pd_set) { _pd_set = pd_set; }
299
300 bool has_protection_domain() { return _pd_set != NULL; }
301
302 // Tells whether the initiating class' protection can access the this _klass
303 bool is_valid_protection_domain(Handle protection_domain) {
304 if (!ProtectionDomainVerification) return true;
305 if (!SystemDictionary::has_checkPackageAccess()) return true;
306
307 return protection_domain() == NULL
308 ? true
309 : contains_protection_domain(protection_domain());
310 }
311
312 void set_strongly_reachable() {
313 for (ProtectionDomainEntry* current = _pd_set;
314 current != NULL;
315 current = current->_next) {
316 current->_pd_cache->set_strongly_reachable();
317 }
318 }
319
320 void verify_protection_domain_set() {
321 for (ProtectionDomainEntry* current = _pd_set;
322 current != NULL;
323 current = current->_next) {
324 current->_pd_cache->protection_domain()->verify();
325 }
326 }
327
328 bool equals(Symbol* class_name, ClassLoaderData* loader_data) const {
329 Klass* klass = (Klass*)literal();
330 return (InstanceKlass::cast(klass)->name() == class_name &&
331 _loader_data == loader_data);
332 }
333
334 void print() {
335 int count = 0;
336 for (ProtectionDomainEntry* current = _pd_set;
337 current != NULL;
338 current = current->_next) {
339 count++;
340 }
341 tty->print_cr("pd set = #%d", count);
342 }
343 };
344
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