Mercurial > hg > truffle
annotate src/share/vm/classfile/dictionary.hpp @ 1656:4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
Summary: G1 was not handling explicit GCs correctly in many ways. It does now. See the CR for the list of improvements contained in this changeset.
Reviewed-by: iveresov, ysr, johnc
author | tonyp |
---|---|
date | Mon, 28 Jun 2010 14:13:17 -0400 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
---|---|
0 | 1 /* |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1507
diff
changeset
|
2 * Copyright (c) 2003, 2009, 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 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1507
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1507
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1507
diff
changeset
|
21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 class DictionaryEntry; | |
26 | |
27 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
28 // The data structure for the system dictionary (and the shared system | |
29 // dictionary). | |
30 | |
31 class Dictionary : public TwoOopHashtable { | |
32 friend class VMStructs; | |
33 private: | |
34 // current iteration index. | |
35 static int _current_class_index; | |
36 // pointer to the current hash table entry. | |
37 static DictionaryEntry* _current_class_entry; | |
38 | |
39 DictionaryEntry* get_entry(int index, unsigned int hash, | |
40 symbolHandle name, Handle loader); | |
41 | |
42 DictionaryEntry* bucket(int i) { | |
43 return (DictionaryEntry*)Hashtable::bucket(i); | |
44 } | |
45 | |
46 // The following method is not MT-safe and must be done under lock. | |
47 DictionaryEntry** bucket_addr(int i) { | |
48 return (DictionaryEntry**)Hashtable::bucket_addr(i); | |
49 } | |
50 | |
51 void add_entry(int index, DictionaryEntry* new_entry) { | |
52 Hashtable::add_entry(index, (HashtableEntry*)new_entry); | |
53 } | |
54 | |
55 | |
56 public: | |
57 Dictionary(int table_size); | |
58 Dictionary(int table_size, HashtableBucket* t, int number_of_entries); | |
59 | |
60 DictionaryEntry* new_entry(unsigned int hash, klassOop klass, oop loader); | |
61 | |
62 DictionaryEntry* new_entry(); | |
63 | |
64 void free_entry(DictionaryEntry* entry); | |
65 | |
66 void add_klass(symbolHandle class_name, Handle class_loader,KlassHandle obj); | |
67 | |
68 klassOop find_class(int index, unsigned int hash, | |
69 symbolHandle name, Handle loader); | |
70 | |
71 klassOop find_shared_class(int index, unsigned int hash, symbolHandle name); | |
72 | |
73 // Compiler support | |
74 klassOop try_get_next_class(); | |
75 | |
76 // GC support | |
77 | |
78 void oops_do(OopClosure* f); | |
79 void always_strong_classes_do(OopClosure* blk); | |
80 void classes_do(void f(klassOop)); | |
81 void classes_do(void f(klassOop, TRAPS), TRAPS); | |
82 void classes_do(void f(klassOop, oop)); | |
83 void classes_do(void f(klassOop, oop, TRAPS), TRAPS); | |
84 | |
85 void methods_do(void f(methodOop)); | |
86 | |
87 | |
88 // Classes loaded by the bootstrap loader are always strongly reachable. | |
89 // If we're not doing class unloading, all classes are strongly reachable. | |
90 static bool is_strongly_reachable(oop class_loader, oop klass) { | |
91 assert (klass != NULL, "should have non-null klass"); | |
92 return (class_loader == NULL || !ClassUnloading); | |
93 } | |
94 | |
95 // Unload (that is, break root links to) all unmarked classes and | |
96 // loaders. Returns "true" iff something was unloaded. | |
97 bool do_unloading(BoolObjectClosure* is_alive); | |
98 | |
99 // Protection domains | |
100 klassOop find(int index, unsigned int hash, symbolHandle name, | |
101 Handle loader, Handle protection_domain, TRAPS); | |
102 bool is_valid_protection_domain(int index, unsigned int hash, | |
103 symbolHandle name, Handle class_loader, | |
104 Handle protection_domain); | |
105 void add_protection_domain(int index, unsigned int hash, | |
106 instanceKlassHandle klass, Handle loader, | |
107 Handle protection_domain, TRAPS); | |
108 | |
109 // Sharing support | |
110 void dump(SerializeOopClosure* soc); | |
111 void restore(SerializeOopClosure* soc); | |
112 void reorder_dictionary(); | |
113 | |
114 | |
115 #ifndef PRODUCT | |
116 void print(); | |
117 #endif | |
118 void verify(); | |
119 }; | |
120 | |
121 // The following classes can be in dictionary.cpp, but we need these | |
122 // to be in header file so that SA's vmStructs can access. | |
123 | |
124 class ProtectionDomainEntry :public CHeapObj { | |
125 friend class VMStructs; | |
126 public: | |
127 ProtectionDomainEntry* _next; | |
128 oop _protection_domain; | |
129 | |
130 ProtectionDomainEntry(oop protection_domain, ProtectionDomainEntry* next) { | |
131 _protection_domain = protection_domain; | |
132 _next = next; | |
133 } | |
134 | |
135 ProtectionDomainEntry* next() { return _next; } | |
136 oop protection_domain() { return _protection_domain; } | |
137 }; | |
138 | |
139 // An entry in the system dictionary, this describes a class as | |
140 // { klassOop, loader, protection_domain }. | |
141 | |
142 class DictionaryEntry : public HashtableEntry { | |
143 friend class VMStructs; | |
144 private: | |
145 // Contains the set of approved protection domains that can access | |
146 // this system dictionary entry. | |
147 ProtectionDomainEntry* _pd_set; | |
148 oop _loader; | |
149 | |
150 | |
151 public: | |
152 // Tells whether a protection is in the approved set. | |
153 bool contains_protection_domain(oop protection_domain) const; | |
154 // Adds a protection domain to the approved set. | |
155 void add_protection_domain(oop protection_domain); | |
156 | |
157 klassOop klass() const { return (klassOop)literal(); } | |
158 klassOop* klass_addr() { return (klassOop*)literal_addr(); } | |
159 | |
160 DictionaryEntry* next() const { | |
161 return (DictionaryEntry*)HashtableEntry::next(); | |
162 } | |
163 | |
164 DictionaryEntry** next_addr() { | |
165 return (DictionaryEntry**)HashtableEntry::next_addr(); | |
166 } | |
167 | |
168 oop loader() const { return _loader; } | |
169 void set_loader(oop loader) { _loader = loader; } | |
170 oop* loader_addr() { return &_loader; } | |
171 | |
172 ProtectionDomainEntry* pd_set() const { return _pd_set; } | |
173 void set_pd_set(ProtectionDomainEntry* pd_set) { _pd_set = pd_set; } | |
174 | |
175 bool has_protection_domain() { return _pd_set != NULL; } | |
176 | |
177 // Tells whether the initiating class' protection can access the this _klass | |
178 bool is_valid_protection_domain(Handle protection_domain) { | |
179 if (!ProtectionDomainVerification) return true; | |
180 if (!SystemDictionary::has_checkPackageAccess()) return true; | |
181 | |
182 return protection_domain() == NULL | |
183 ? true | |
184 : contains_protection_domain(protection_domain()); | |
185 } | |
186 | |
187 | |
188 void protection_domain_set_oops_do(OopClosure* f) { | |
189 for (ProtectionDomainEntry* current = _pd_set; | |
190 current != NULL; | |
191 current = current->_next) { | |
192 f->do_oop(&(current->_protection_domain)); | |
193 } | |
194 } | |
195 | |
196 void verify_protection_domain_set() { | |
197 for (ProtectionDomainEntry* current = _pd_set; | |
198 current != NULL; | |
199 current = current->_next) { | |
200 current->_protection_domain->verify(); | |
201 } | |
202 } | |
203 | |
204 bool equals(symbolOop class_name, oop class_loader) const { | |
205 klassOop klass = (klassOop)literal(); | |
206 return (instanceKlass::cast(klass)->name() == class_name && | |
207 _loader == class_loader); | |
208 } | |
209 | |
210 void print() { | |
211 int count = 0; | |
212 for (ProtectionDomainEntry* current = _pd_set; | |
213 current != NULL; | |
214 current = current->_next) { | |
215 count++; | |
216 } | |
217 tty->print_cr("pd set = #%d", count); | |
218 } | |
219 }; | |
710 | 220 |
221 // Entry in a SymbolPropertyTable, mapping a single symbolOop | |
222 // to a managed and an unmanaged pointer. | |
223 class SymbolPropertyEntry : public HashtableEntry { | |
224 friend class VMStructs; | |
225 private: | |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
710
diff
changeset
|
226 intptr_t _symbol_mode; // secondary key |
710 | 227 oop _property_oop; |
228 address _property_data; | |
229 | |
230 public: | |
231 symbolOop symbol() const { return (symbolOop) literal(); } | |
232 | |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
710
diff
changeset
|
233 intptr_t symbol_mode() const { return _symbol_mode; } |
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
710
diff
changeset
|
234 void set_symbol_mode(intptr_t m) { _symbol_mode = m; } |
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
710
diff
changeset
|
235 |
710 | 236 oop property_oop() const { return _property_oop; } |
237 void set_property_oop(oop p) { _property_oop = p; } | |
238 | |
239 address property_data() const { return _property_data; } | |
240 void set_property_data(address p) { _property_data = p; } | |
241 | |
242 SymbolPropertyEntry* next() const { | |
243 return (SymbolPropertyEntry*)HashtableEntry::next(); | |
244 } | |
245 | |
246 SymbolPropertyEntry** next_addr() { | |
247 return (SymbolPropertyEntry**)HashtableEntry::next_addr(); | |
248 } | |
249 | |
250 oop* symbol_addr() { return literal_addr(); } | |
251 oop* property_oop_addr() { return &_property_oop; } | |
252 | |
253 void print_on(outputStream* st) const { | |
254 symbol()->print_value_on(st); | |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
710
diff
changeset
|
255 st->print("/mode="INTX_FORMAT, symbol_mode()); |
710 | 256 st->print(" -> "); |
257 bool printed = false; | |
258 if (property_oop() != NULL) { | |
259 property_oop()->print_value_on(st); | |
260 printed = true; | |
261 } | |
262 if (property_data() != NULL) { | |
263 if (printed) st->print(" and "); | |
264 st->print(INTPTR_FORMAT, property_data()); | |
265 printed = true; | |
266 } | |
267 st->print_cr(printed ? "" : "(empty)"); | |
268 } | |
269 }; | |
270 | |
271 // A system-internal mapping of symbols to pointers, both managed | |
272 // and unmanaged. Used to record the auto-generation of each method | |
273 // MethodHandle.invoke(S)T, for all signatures (S)T. | |
274 class SymbolPropertyTable : public Hashtable { | |
275 friend class VMStructs; | |
276 private: | |
277 SymbolPropertyEntry* bucket(int i) { | |
278 return (SymbolPropertyEntry*) Hashtable::bucket(i); | |
279 } | |
280 | |
281 // The following method is not MT-safe and must be done under lock. | |
282 SymbolPropertyEntry** bucket_addr(int i) { | |
283 return (SymbolPropertyEntry**) Hashtable::bucket_addr(i); | |
284 } | |
285 | |
286 void add_entry(int index, SymbolPropertyEntry* new_entry) { | |
287 ShouldNotReachHere(); | |
288 } | |
289 void set_entry(int index, SymbolPropertyEntry* new_entry) { | |
290 ShouldNotReachHere(); | |
291 } | |
292 | |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
710
diff
changeset
|
293 SymbolPropertyEntry* new_entry(unsigned int hash, symbolOop symbol, intptr_t symbol_mode) { |
710 | 294 SymbolPropertyEntry* entry = (SymbolPropertyEntry*) Hashtable::new_entry(hash, symbol); |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
710
diff
changeset
|
295 entry->set_symbol_mode(symbol_mode); |
710 | 296 entry->set_property_oop(NULL); |
297 entry->set_property_data(NULL); | |
298 return entry; | |
299 } | |
300 | |
301 public: | |
302 SymbolPropertyTable(int table_size); | |
303 SymbolPropertyTable(int table_size, HashtableBucket* t, int number_of_entries); | |
304 | |
305 void free_entry(SymbolPropertyEntry* entry) { | |
306 Hashtable::free_entry(entry); | |
307 } | |
308 | |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
710
diff
changeset
|
309 unsigned int compute_hash(symbolHandle sym, intptr_t symbol_mode) { |
710 | 310 // Use the regular identity_hash. |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
710
diff
changeset
|
311 return Hashtable::compute_hash(sym) ^ symbol_mode; |
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
710
diff
changeset
|
312 } |
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
710
diff
changeset
|
313 |
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
710
diff
changeset
|
314 int index_for(symbolHandle name, intptr_t symbol_mode) { |
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
710
diff
changeset
|
315 return hash_to_index(compute_hash(name, symbol_mode)); |
710 | 316 } |
317 | |
318 // need not be locked; no state change | |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
710
diff
changeset
|
319 SymbolPropertyEntry* find_entry(int index, unsigned int hash, symbolHandle name, intptr_t name_mode); |
710 | 320 |
321 // must be done under SystemDictionary_lock | |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
710
diff
changeset
|
322 SymbolPropertyEntry* add_entry(int index, unsigned int hash, symbolHandle name, intptr_t name_mode); |
710 | 323 |
324 // GC support | |
325 void oops_do(OopClosure* f); | |
326 void methods_do(void f(methodOop)); | |
327 | |
328 // Sharing support | |
329 void dump(SerializeOopClosure* soc); | |
330 void restore(SerializeOopClosure* soc); | |
331 void reorder_dictionary(); | |
332 | |
333 #ifndef PRODUCT | |
334 void print(); | |
335 #endif | |
336 void verify(); | |
337 }; | |
338 |