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annotate src/share/vm/classfile/placeholders.hpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
author | stefank |
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date | Tue, 23 Nov 2010 13:22:55 -0800 |
parents | c18cbe5936b8 |
children | c760f78e0a53 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2003, 2010, 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
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
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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 #ifndef SHARE_VM_CLASSFILE_PLACEHOLDERS_HPP |
26 #define SHARE_VM_CLASSFILE_PLACEHOLDERS_HPP | |
27 | |
28 #include "utilities/hashtable.hpp" | |
29 | |
0 | 30 class PlaceholderEntry; |
31 | |
32 // Placeholder objects. These represent classes currently | |
33 // being loaded, as well as arrays of primitives. | |
34 // | |
35 | |
36 class PlaceholderTable : public TwoOopHashtable { | |
37 friend class VMStructs; | |
38 | |
39 public: | |
40 PlaceholderTable(int table_size); | |
41 | |
42 PlaceholderEntry* new_entry(int hash, symbolOop name, oop loader, bool havesupername, symbolOop supername); | |
43 | |
44 PlaceholderEntry* bucket(int i) { | |
45 return (PlaceholderEntry*)Hashtable::bucket(i); | |
46 } | |
47 | |
48 PlaceholderEntry** bucket_addr(int i) { | |
49 return (PlaceholderEntry**)Hashtable::bucket_addr(i); | |
50 } | |
51 | |
52 void add_entry(int index, PlaceholderEntry* new_entry) { | |
53 Hashtable::add_entry(index, (HashtableEntry*)new_entry); | |
54 } | |
55 | |
56 void add_entry(int index, unsigned int hash, symbolHandle name, | |
57 Handle loader, bool havesupername, symbolHandle supername); | |
58 | |
59 // This returns a symbolOop to match type for SystemDictionary | |
60 symbolOop find_entry(int index, unsigned int hash, | |
61 symbolHandle name, Handle loader); | |
62 | |
63 PlaceholderEntry* get_entry(int index, unsigned int hash, | |
64 symbolHandle name, Handle loader); | |
65 | |
66 // caller to create a placeholder entry must enumerate an action | |
67 // caller claims ownership of that action | |
68 // For parallel classloading: | |
69 // multiple LOAD_INSTANCE threads can proceed in parallel | |
70 // multiple LOAD_SUPER threads can proceed in parallel | |
71 // LOAD_SUPER needed to check for class circularity | |
72 // DEFINE_CLASS: ultimately define class must be single threaded | |
73 // on a class/classloader basis | |
74 // so the head of that queue owns the token | |
75 // and the rest of the threads return the result the first thread gets | |
76 enum classloadAction { | |
77 LOAD_INSTANCE = 1, // calling load_instance_class | |
78 LOAD_SUPER = 2, // loading superclass for this class | |
79 DEFINE_CLASS = 3 // find_or_define class | |
80 }; | |
81 | |
82 // find_and_add returns probe pointer - old or new | |
83 // If no entry exists, add a placeholder entry and push SeenThread | |
84 // If entry exists, reuse entry and push SeenThread for classloadAction | |
85 PlaceholderEntry* find_and_add(int index, unsigned int hash, | |
86 symbolHandle name, Handle loader, | |
87 classloadAction action, symbolHandle supername, | |
88 Thread* thread); | |
89 | |
90 void remove_entry(int index, unsigned int hash, | |
91 symbolHandle name, Handle loader); | |
92 | |
93 // Remove placeholder information | |
94 void find_and_remove(int index, unsigned int hash, | |
95 symbolHandle name, Handle loader, Thread* thread); | |
96 | |
97 // GC support. | |
98 void oops_do(OopClosure* f); | |
99 | |
100 // JVMTI support | |
101 void entries_do(void f(symbolOop, oop)); | |
102 | |
103 #ifndef PRODUCT | |
104 void print(); | |
105 #endif | |
106 void verify(); | |
107 }; | |
108 | |
109 // SeenThread objects represent list of threads that are | |
110 // currently performing a load action on a class. | |
111 // For class circularity, set before loading a superclass. | |
112 // For bootclasssearchpath, set before calling load_instance_class. | |
113 // Defining must be single threaded on a class/classloader basis | |
114 // For DEFINE_CLASS, the head of the queue owns the | |
115 // define token and the rest of the threads wait to return the | |
116 // result the first thread gets. | |
117 class SeenThread: public CHeapObj { | |
118 private: | |
119 Thread *_thread; | |
120 SeenThread* _stnext; | |
121 SeenThread* _stprev; | |
122 public: | |
123 SeenThread(Thread *thread) { | |
124 _thread = thread; | |
125 _stnext = NULL; | |
126 _stprev = NULL; | |
127 } | |
128 Thread* thread() const { return _thread;} | |
129 void set_thread(Thread *thread) { _thread = thread; } | |
130 | |
131 SeenThread* next() const { return _stnext;} | |
132 void set_next(SeenThread *seen) { _stnext = seen; } | |
133 void set_prev(SeenThread *seen) { _stprev = seen; } | |
134 | |
135 #ifndef PRODUCT | |
136 void printActionQ() { | |
137 SeenThread* seen = this; | |
138 while (seen != NULL) { | |
139 seen->thread()->print_value(); | |
140 tty->print(", "); | |
141 seen = seen->next(); | |
142 } | |
143 } | |
144 #endif // PRODUCT | |
145 }; | |
146 | |
147 // Placeholder objects represent classes currently being loaded. | |
148 // All threads examining the placeholder table must hold the | |
149 // SystemDictionary_lock, so we don't need special precautions | |
150 // on store ordering here. | |
151 // The system dictionary is the only user of this class. | |
152 | |
153 class PlaceholderEntry : public HashtableEntry { | |
154 friend class VMStructs; | |
155 | |
156 | |
157 private: | |
158 oop _loader; // initiating loader | |
159 bool _havesupername; // distinguish between null supername, and unknown | |
160 symbolOop _supername; | |
161 Thread* _definer; // owner of define token | |
162 klassOop _instanceKlass; // instanceKlass from successful define | |
163 SeenThread* _superThreadQ; // doubly-linked queue of Threads loading a superclass for this class | |
164 SeenThread* _loadInstanceThreadQ; // loadInstance thread | |
165 // can be multiple threads if classloader object lock broken by application | |
166 // or if classloader supports parallel classloading | |
167 | |
168 SeenThread* _defineThreadQ; // queue of Threads trying to define this class | |
169 // including _definer | |
170 // _definer owns token | |
171 // queue waits for and returns results from _definer | |
172 | |
173 public: | |
174 // Simple accessors, used only by SystemDictionary | |
175 symbolOop klass() const { return (symbolOop)literal(); } | |
176 symbolOop* klass_addr() { return (symbolOop*)literal_addr(); } | |
177 | |
178 oop loader() const { return _loader; } | |
179 void set_loader(oop loader) { _loader = loader; } | |
180 oop* loader_addr() { return &_loader; } | |
181 | |
182 bool havesupername() const { return _havesupername; } | |
183 void set_havesupername(bool havesupername) { _havesupername = havesupername; } | |
184 | |
185 symbolOop supername() const { return _supername; } | |
186 void set_supername(symbolOop supername) { _supername = supername; } | |
187 symbolOop* supername_addr() { return &_supername; } | |
188 | |
189 Thread* definer() const {return _definer; } | |
190 void set_definer(Thread* definer) { _definer = definer; } | |
191 | |
192 klassOop instanceKlass() const {return _instanceKlass; } | |
193 void set_instanceKlass(klassOop instanceKlass) { _instanceKlass = instanceKlass; } | |
194 klassOop* instanceKlass_addr() { return &_instanceKlass; } | |
195 | |
196 SeenThread* superThreadQ() const { return _superThreadQ; } | |
197 void set_superThreadQ(SeenThread* SeenThread) { _superThreadQ = SeenThread; } | |
198 | |
199 SeenThread* loadInstanceThreadQ() const { return _loadInstanceThreadQ; } | |
200 void set_loadInstanceThreadQ(SeenThread* SeenThread) { _loadInstanceThreadQ = SeenThread; } | |
201 | |
202 SeenThread* defineThreadQ() const { return _defineThreadQ; } | |
203 void set_defineThreadQ(SeenThread* SeenThread) { _defineThreadQ = SeenThread; } | |
204 | |
205 PlaceholderEntry* next() const { | |
206 return (PlaceholderEntry*)HashtableEntry::next(); | |
207 } | |
208 | |
209 PlaceholderEntry** next_addr() { | |
210 return (PlaceholderEntry**)HashtableEntry::next_addr(); | |
211 } | |
212 | |
213 // Test for equality | |
214 // Entries are unique for class/classloader name pair | |
215 bool equals(symbolOop class_name, oop class_loader) const { | |
216 return (klass() == class_name && loader() == class_loader); | |
217 } | |
218 | |
219 SeenThread* actionToQueue(PlaceholderTable::classloadAction action) { | |
220 SeenThread* queuehead; | |
221 switch (action) { | |
222 case PlaceholderTable::LOAD_INSTANCE: | |
223 queuehead = _loadInstanceThreadQ; | |
224 break; | |
225 case PlaceholderTable::LOAD_SUPER: | |
226 queuehead = _superThreadQ; | |
227 break; | |
228 case PlaceholderTable::DEFINE_CLASS: | |
229 queuehead = _defineThreadQ; | |
230 break; | |
231 default: Unimplemented(); | |
232 } | |
233 return queuehead; | |
234 } | |
235 | |
236 void set_threadQ(SeenThread* seenthread, PlaceholderTable::classloadAction action) { | |
237 switch (action) { | |
238 case PlaceholderTable::LOAD_INSTANCE: | |
239 _loadInstanceThreadQ = seenthread; | |
240 break; | |
241 case PlaceholderTable::LOAD_SUPER: | |
242 _superThreadQ = seenthread; | |
243 break; | |
244 case PlaceholderTable::DEFINE_CLASS: | |
245 _defineThreadQ = seenthread; | |
246 break; | |
247 default: Unimplemented(); | |
248 } | |
249 return; | |
250 } | |
251 | |
252 bool super_load_in_progress() { | |
253 return (_superThreadQ != NULL); | |
254 } | |
255 | |
256 bool instance_load_in_progress() { | |
257 return (_loadInstanceThreadQ != NULL); | |
258 } | |
259 | |
260 bool define_class_in_progress() { | |
261 return (_defineThreadQ != NULL); | |
262 } | |
263 | |
264 // Doubly-linked list of Threads per action for class/classloader pair | |
265 // Class circularity support: links in thread before loading superclass | |
266 // bootstrapsearchpath support: links in a thread before load_instance_class | |
267 // definers: use as queue of define requestors, including owner of | |
268 // define token. Appends for debugging of requestor order | |
269 void add_seen_thread(Thread* thread, PlaceholderTable::classloadAction action) { | |
270 assert_lock_strong(SystemDictionary_lock); | |
271 SeenThread* threadEntry = new SeenThread(thread); | |
272 SeenThread* seen = actionToQueue(action); | |
273 | |
274 if (seen == NULL) { | |
275 set_threadQ(threadEntry, action); | |
276 return; | |
277 } | |
278 SeenThread* next; | |
279 while ((next = seen->next()) != NULL) { | |
280 seen = next; | |
281 } | |
282 seen->set_next(threadEntry); | |
283 threadEntry->set_prev(seen); | |
284 return; | |
285 } | |
286 | |
287 bool check_seen_thread(Thread* thread, PlaceholderTable::classloadAction action) { | |
288 assert_lock_strong(SystemDictionary_lock); | |
289 SeenThread* threadQ = actionToQueue(action); | |
290 SeenThread* seen = threadQ; | |
291 while (seen) { | |
292 if (thread == seen->thread()) { | |
293 return true; | |
294 } | |
295 seen = seen->next(); | |
296 } | |
297 return false; | |
298 } | |
299 | |
300 // returns true if seenthreadQ is now empty | |
301 // Note, caller must ensure probe still exists while holding | |
302 // SystemDictionary_lock | |
303 // ignores if cleanup has already been done | |
304 // if found, deletes SeenThread | |
305 bool remove_seen_thread(Thread* thread, PlaceholderTable::classloadAction action) { | |
306 assert_lock_strong(SystemDictionary_lock); | |
307 SeenThread* threadQ = actionToQueue(action); | |
308 SeenThread* seen = threadQ; | |
309 SeenThread* prev = NULL; | |
310 while (seen) { | |
311 if (thread == seen->thread()) { | |
312 if (prev) { | |
313 prev->set_next(seen->next()); | |
314 } else { | |
315 set_threadQ(seen->next(), action); | |
316 } | |
317 if (seen->next()) { | |
318 seen->next()->set_prev(prev); | |
319 } | |
320 delete seen; | |
321 break; | |
322 } | |
323 prev = seen; | |
324 seen = seen->next(); | |
325 } | |
326 return (actionToQueue(action) == NULL); | |
327 } | |
328 | |
329 // GC support | |
330 // Applies "f->do_oop" to all root oops in the placeholder table. | |
331 void oops_do(OopClosure* blk); | |
332 | |
333 // Print method doesn't append a cr | |
334 void print() const PRODUCT_RETURN; | |
335 void verify() const; | |
336 }; | |
1972 | 337 |
338 #endif // SHARE_VM_CLASSFILE_PLACEHOLDERS_HPP |