Mercurial > hg > truffle
annotate src/share/vm/classfile/placeholders.hpp @ 2100:b1a2afa37ec4
7003271: Hotspot should track cumulative Java heap bytes allocated on a per-thread basis
Summary: Track allocated bytes in Thread's, update on TLAB retirement and direct allocation in Eden and tenured, add JNI methods for ThreadMXBean.
Reviewed-by: coleenp, kvn, dholmes, ysr
author | phh |
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date | Fri, 07 Jan 2011 10:42:32 -0500 |
parents | c760f78e0a53 |
children | 3582bf76420e |
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 |
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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 | |
1983
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28 #include "runtime/thread.hpp" |
1972 | 29 #include "utilities/hashtable.hpp" |
30 | |
0 | 31 class PlaceholderEntry; |
32 | |
33 // Placeholder objects. These represent classes currently | |
34 // being loaded, as well as arrays of primitives. | |
35 // | |
36 | |
37 class PlaceholderTable : public TwoOopHashtable { | |
38 friend class VMStructs; | |
39 | |
40 public: | |
41 PlaceholderTable(int table_size); | |
42 | |
43 PlaceholderEntry* new_entry(int hash, symbolOop name, oop loader, bool havesupername, symbolOop supername); | |
44 | |
45 PlaceholderEntry* bucket(int i) { | |
46 return (PlaceholderEntry*)Hashtable::bucket(i); | |
47 } | |
48 | |
49 PlaceholderEntry** bucket_addr(int i) { | |
50 return (PlaceholderEntry**)Hashtable::bucket_addr(i); | |
51 } | |
52 | |
53 void add_entry(int index, PlaceholderEntry* new_entry) { | |
54 Hashtable::add_entry(index, (HashtableEntry*)new_entry); | |
55 } | |
56 | |
57 void add_entry(int index, unsigned int hash, symbolHandle name, | |
58 Handle loader, bool havesupername, symbolHandle supername); | |
59 | |
60 // This returns a symbolOop to match type for SystemDictionary | |
61 symbolOop find_entry(int index, unsigned int hash, | |
62 symbolHandle name, Handle loader); | |
63 | |
64 PlaceholderEntry* get_entry(int index, unsigned int hash, | |
65 symbolHandle name, Handle loader); | |
66 | |
67 // caller to create a placeholder entry must enumerate an action | |
68 // caller claims ownership of that action | |
69 // For parallel classloading: | |
70 // multiple LOAD_INSTANCE threads can proceed in parallel | |
71 // multiple LOAD_SUPER threads can proceed in parallel | |
72 // LOAD_SUPER needed to check for class circularity | |
73 // DEFINE_CLASS: ultimately define class must be single threaded | |
74 // on a class/classloader basis | |
75 // so the head of that queue owns the token | |
76 // and the rest of the threads return the result the first thread gets | |
77 enum classloadAction { | |
78 LOAD_INSTANCE = 1, // calling load_instance_class | |
79 LOAD_SUPER = 2, // loading superclass for this class | |
80 DEFINE_CLASS = 3 // find_or_define class | |
81 }; | |
82 | |
83 // find_and_add returns probe pointer - old or new | |
84 // If no entry exists, add a placeholder entry and push SeenThread | |
85 // If entry exists, reuse entry and push SeenThread for classloadAction | |
86 PlaceholderEntry* find_and_add(int index, unsigned int hash, | |
87 symbolHandle name, Handle loader, | |
88 classloadAction action, symbolHandle supername, | |
89 Thread* thread); | |
90 | |
91 void remove_entry(int index, unsigned int hash, | |
92 symbolHandle name, Handle loader); | |
93 | |
94 // Remove placeholder information | |
95 void find_and_remove(int index, unsigned int hash, | |
96 symbolHandle name, Handle loader, Thread* thread); | |
97 | |
98 // GC support. | |
99 void oops_do(OopClosure* f); | |
100 | |
101 // JVMTI support | |
102 void entries_do(void f(symbolOop, oop)); | |
103 | |
104 #ifndef PRODUCT | |
105 void print(); | |
106 #endif | |
107 void verify(); | |
108 }; | |
109 | |
110 // SeenThread objects represent list of threads that are | |
111 // currently performing a load action on a class. | |
112 // For class circularity, set before loading a superclass. | |
113 // For bootclasssearchpath, set before calling load_instance_class. | |
114 // Defining must be single threaded on a class/classloader basis | |
115 // For DEFINE_CLASS, the head of the queue owns the | |
116 // define token and the rest of the threads wait to return the | |
117 // result the first thread gets. | |
118 class SeenThread: public CHeapObj { | |
119 private: | |
120 Thread *_thread; | |
121 SeenThread* _stnext; | |
122 SeenThread* _stprev; | |
123 public: | |
124 SeenThread(Thread *thread) { | |
125 _thread = thread; | |
126 _stnext = NULL; | |
127 _stprev = NULL; | |
128 } | |
129 Thread* thread() const { return _thread;} | |
130 void set_thread(Thread *thread) { _thread = thread; } | |
131 | |
132 SeenThread* next() const { return _stnext;} | |
133 void set_next(SeenThread *seen) { _stnext = seen; } | |
134 void set_prev(SeenThread *seen) { _stprev = seen; } | |
135 | |
136 #ifndef PRODUCT | |
137 void printActionQ() { | |
138 SeenThread* seen = this; | |
139 while (seen != NULL) { | |
140 seen->thread()->print_value(); | |
141 tty->print(", "); | |
142 seen = seen->next(); | |
143 } | |
144 } | |
145 #endif // PRODUCT | |
146 }; | |
147 | |
148 // Placeholder objects represent classes currently being loaded. | |
149 // All threads examining the placeholder table must hold the | |
150 // SystemDictionary_lock, so we don't need special precautions | |
151 // on store ordering here. | |
152 // The system dictionary is the only user of this class. | |
153 | |
154 class PlaceholderEntry : public HashtableEntry { | |
155 friend class VMStructs; | |
156 | |
157 | |
158 private: | |
159 oop _loader; // initiating loader | |
160 bool _havesupername; // distinguish between null supername, and unknown | |
161 symbolOop _supername; | |
162 Thread* _definer; // owner of define token | |
163 klassOop _instanceKlass; // instanceKlass from successful define | |
164 SeenThread* _superThreadQ; // doubly-linked queue of Threads loading a superclass for this class | |
165 SeenThread* _loadInstanceThreadQ; // loadInstance thread | |
166 // can be multiple threads if classloader object lock broken by application | |
167 // or if classloader supports parallel classloading | |
168 | |
169 SeenThread* _defineThreadQ; // queue of Threads trying to define this class | |
170 // including _definer | |
171 // _definer owns token | |
172 // queue waits for and returns results from _definer | |
173 | |
174 public: | |
175 // Simple accessors, used only by SystemDictionary | |
176 symbolOop klass() const { return (symbolOop)literal(); } | |
177 symbolOop* klass_addr() { return (symbolOop*)literal_addr(); } | |
178 | |
179 oop loader() const { return _loader; } | |
180 void set_loader(oop loader) { _loader = loader; } | |
181 oop* loader_addr() { return &_loader; } | |
182 | |
183 bool havesupername() const { return _havesupername; } | |
184 void set_havesupername(bool havesupername) { _havesupername = havesupername; } | |
185 | |
186 symbolOop supername() const { return _supername; } | |
187 void set_supername(symbolOop supername) { _supername = supername; } | |
188 symbolOop* supername_addr() { return &_supername; } | |
189 | |
190 Thread* definer() const {return _definer; } | |
191 void set_definer(Thread* definer) { _definer = definer; } | |
192 | |
193 klassOop instanceKlass() const {return _instanceKlass; } | |
194 void set_instanceKlass(klassOop instanceKlass) { _instanceKlass = instanceKlass; } | |
195 klassOop* instanceKlass_addr() { return &_instanceKlass; } | |
196 | |
197 SeenThread* superThreadQ() const { return _superThreadQ; } | |
198 void set_superThreadQ(SeenThread* SeenThread) { _superThreadQ = SeenThread; } | |
199 | |
200 SeenThread* loadInstanceThreadQ() const { return _loadInstanceThreadQ; } | |
201 void set_loadInstanceThreadQ(SeenThread* SeenThread) { _loadInstanceThreadQ = SeenThread; } | |
202 | |
203 SeenThread* defineThreadQ() const { return _defineThreadQ; } | |
204 void set_defineThreadQ(SeenThread* SeenThread) { _defineThreadQ = SeenThread; } | |
205 | |
206 PlaceholderEntry* next() const { | |
207 return (PlaceholderEntry*)HashtableEntry::next(); | |
208 } | |
209 | |
210 PlaceholderEntry** next_addr() { | |
211 return (PlaceholderEntry**)HashtableEntry::next_addr(); | |
212 } | |
213 | |
214 // Test for equality | |
215 // Entries are unique for class/classloader name pair | |
216 bool equals(symbolOop class_name, oop class_loader) const { | |
217 return (klass() == class_name && loader() == class_loader); | |
218 } | |
219 | |
220 SeenThread* actionToQueue(PlaceholderTable::classloadAction action) { | |
221 SeenThread* queuehead; | |
222 switch (action) { | |
223 case PlaceholderTable::LOAD_INSTANCE: | |
224 queuehead = _loadInstanceThreadQ; | |
225 break; | |
226 case PlaceholderTable::LOAD_SUPER: | |
227 queuehead = _superThreadQ; | |
228 break; | |
229 case PlaceholderTable::DEFINE_CLASS: | |
230 queuehead = _defineThreadQ; | |
231 break; | |
232 default: Unimplemented(); | |
233 } | |
234 return queuehead; | |
235 } | |
236 | |
237 void set_threadQ(SeenThread* seenthread, PlaceholderTable::classloadAction action) { | |
238 switch (action) { | |
239 case PlaceholderTable::LOAD_INSTANCE: | |
240 _loadInstanceThreadQ = seenthread; | |
241 break; | |
242 case PlaceholderTable::LOAD_SUPER: | |
243 _superThreadQ = seenthread; | |
244 break; | |
245 case PlaceholderTable::DEFINE_CLASS: | |
246 _defineThreadQ = seenthread; | |
247 break; | |
248 default: Unimplemented(); | |
249 } | |
250 return; | |
251 } | |
252 | |
253 bool super_load_in_progress() { | |
254 return (_superThreadQ != NULL); | |
255 } | |
256 | |
257 bool instance_load_in_progress() { | |
258 return (_loadInstanceThreadQ != NULL); | |
259 } | |
260 | |
261 bool define_class_in_progress() { | |
262 return (_defineThreadQ != NULL); | |
263 } | |
264 | |
265 // Doubly-linked list of Threads per action for class/classloader pair | |
266 // Class circularity support: links in thread before loading superclass | |
267 // bootstrapsearchpath support: links in a thread before load_instance_class | |
268 // definers: use as queue of define requestors, including owner of | |
269 // define token. Appends for debugging of requestor order | |
270 void add_seen_thread(Thread* thread, PlaceholderTable::classloadAction action) { | |
271 assert_lock_strong(SystemDictionary_lock); | |
272 SeenThread* threadEntry = new SeenThread(thread); | |
273 SeenThread* seen = actionToQueue(action); | |
274 | |
275 if (seen == NULL) { | |
276 set_threadQ(threadEntry, action); | |
277 return; | |
278 } | |
279 SeenThread* next; | |
280 while ((next = seen->next()) != NULL) { | |
281 seen = next; | |
282 } | |
283 seen->set_next(threadEntry); | |
284 threadEntry->set_prev(seen); | |
285 return; | |
286 } | |
287 | |
288 bool check_seen_thread(Thread* thread, PlaceholderTable::classloadAction action) { | |
289 assert_lock_strong(SystemDictionary_lock); | |
290 SeenThread* threadQ = actionToQueue(action); | |
291 SeenThread* seen = threadQ; | |
292 while (seen) { | |
293 if (thread == seen->thread()) { | |
294 return true; | |
295 } | |
296 seen = seen->next(); | |
297 } | |
298 return false; | |
299 } | |
300 | |
301 // returns true if seenthreadQ is now empty | |
302 // Note, caller must ensure probe still exists while holding | |
303 // SystemDictionary_lock | |
304 // ignores if cleanup has already been done | |
305 // if found, deletes SeenThread | |
306 bool remove_seen_thread(Thread* thread, PlaceholderTable::classloadAction action) { | |
307 assert_lock_strong(SystemDictionary_lock); | |
308 SeenThread* threadQ = actionToQueue(action); | |
309 SeenThread* seen = threadQ; | |
310 SeenThread* prev = NULL; | |
311 while (seen) { | |
312 if (thread == seen->thread()) { | |
313 if (prev) { | |
314 prev->set_next(seen->next()); | |
315 } else { | |
316 set_threadQ(seen->next(), action); | |
317 } | |
318 if (seen->next()) { | |
319 seen->next()->set_prev(prev); | |
320 } | |
321 delete seen; | |
322 break; | |
323 } | |
324 prev = seen; | |
325 seen = seen->next(); | |
326 } | |
327 return (actionToQueue(action) == NULL); | |
328 } | |
329 | |
330 // GC support | |
331 // Applies "f->do_oop" to all root oops in the placeholder table. | |
332 void oops_do(OopClosure* blk); | |
333 | |
334 // Print method doesn't append a cr | |
335 void print() const PRODUCT_RETURN; | |
336 void verify() const; | |
337 }; | |
1972 | 338 |
339 #endif // SHARE_VM_CLASSFILE_PLACEHOLDERS_HPP |