Mercurial > hg > graal-jvmci-8
annotate src/share/vm/prims/jvmtiThreadState.hpp @ 881:16c930df1e9b
Merge
author | dcubed |
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date | Tue, 28 Jul 2009 13:50:07 -0600 |
parents | ea20d7ce26b0 |
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0 | 1 /* |
2 * Copyright 2003-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #ifndef _JAVA_JVMTITHREADSTATE_H_ | |
26 #define _JAVA_JVMTITHREADSTATE_H_ | |
27 | |
28 // | |
29 // Forward Declarations | |
30 // | |
31 | |
32 class JvmtiEnvBase; | |
33 class JvmtiEnvThreadState; | |
34 class JvmtiDynamicCodeEventCollector; | |
35 | |
36 enum JvmtiClassLoadKind { | |
37 jvmti_class_load_kind_load = 100, | |
38 jvmti_class_load_kind_retransform, | |
39 jvmti_class_load_kind_redefine | |
40 }; | |
41 | |
42 /////////////////////////////////////////////////////////////// | |
43 // | |
44 // class JvmtiEnvThreadStateIterator | |
45 // | |
46 // The only safe means of iterating through the JvmtiEnvThreadStates | |
47 // in a JvmtiThreadState. | |
48 // Note that this iteratation includes invalid environments pending | |
49 // deallocation -- in fact, some uses depend on this behavior. | |
50 // | |
51 class JvmtiEnvThreadStateIterator : public StackObj { | |
52 private: | |
53 JvmtiThreadState* state; | |
54 public: | |
55 JvmtiEnvThreadStateIterator(JvmtiThreadState* thread_state); | |
56 ~JvmtiEnvThreadStateIterator(); | |
57 JvmtiEnvThreadState* first(); | |
58 JvmtiEnvThreadState* next(JvmtiEnvThreadState* ets); | |
59 }; | |
60 | |
61 | |
62 /////////////////////////////////////////////////////////////// | |
63 // | |
64 // class JvmtiThreadState | |
65 // | |
66 // The Jvmti state for each thread (across all JvmtiEnv): | |
67 // 1. Local table of enabled events. | |
68 class JvmtiThreadState : public CHeapObj { | |
69 private: | |
70 friend class JvmtiEnv; | |
71 JavaThread *_thread; | |
72 bool _exception_detected; | |
73 bool _exception_caught; | |
74 bool _hide_single_stepping; | |
75 bool _pending_step_for_popframe; | |
76 bool _pending_step_for_earlyret; | |
77 int _hide_level; | |
78 | |
79 // Used to send class being redefined/retransformed and kind of transform | |
80 // info to the class file load hook event handler. | |
81 KlassHandle *_class_being_redefined; | |
82 JvmtiClassLoadKind _class_load_kind; | |
83 | |
84 // This is only valid when is_interp_only_mode() returns true | |
85 int _cur_stack_depth; | |
86 | |
87 JvmtiThreadEventEnable _thread_event_enable; | |
88 | |
89 // for support of JvmtiEnvThreadState | |
90 JvmtiEnvThreadState* _head_env_thread_state; | |
91 | |
92 // doubly-linked linear list of active thread state | |
93 // needed in order to iterate the list without holding Threads_lock | |
94 static JvmtiThreadState *_head; | |
95 JvmtiThreadState *_next; | |
96 JvmtiThreadState *_prev; | |
97 | |
98 // holds the current dynamic code event collector, NULL if no event collector in use | |
99 JvmtiDynamicCodeEventCollector* _dynamic_code_event_collector; | |
100 // holds the current vm object alloc event collector, NULL if no event collector in use | |
101 JvmtiVMObjectAllocEventCollector* _vm_object_alloc_event_collector; | |
102 | |
103 // Should only be created by factory methods | |
104 JvmtiThreadState(JavaThread *thread); | |
105 | |
106 friend class JvmtiEnvThreadStateIterator; | |
107 inline JvmtiEnvThreadState* head_env_thread_state(); | |
108 inline void set_head_env_thread_state(JvmtiEnvThreadState* ets); | |
109 | |
110 public: | |
111 ~JvmtiThreadState(); | |
112 | |
113 // is event_type enabled and usable for this thread in any enviroments? | |
114 bool is_enabled(jvmtiEvent event_type) { | |
115 return _thread_event_enable.is_enabled(event_type); | |
116 } | |
117 | |
118 JvmtiThreadEventEnable *thread_event_enable() { | |
119 return &_thread_event_enable; | |
120 } | |
121 | |
122 // Must only be called in situations where the state is for the current thread and | |
123 // the environment can not go away. To be safe, the returned JvmtiEnvThreadState | |
124 // must be used in such a way as there can be no intervening safepoints. | |
125 inline JvmtiEnvThreadState* env_thread_state(JvmtiEnvBase *env); | |
126 | |
127 static void periodic_clean_up(); | |
128 | |
129 void add_env(JvmtiEnvBase *env); | |
130 | |
131 // Used by the interpreter for fullspeed debugging support | |
132 bool is_interp_only_mode() { return _thread->is_interp_only_mode(); } | |
133 void enter_interp_only_mode(); | |
134 void leave_interp_only_mode(); | |
135 | |
136 // access to the linked list of all JVMTI thread states | |
137 static JvmtiThreadState *first() { | |
138 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
139 return _head; | |
140 } | |
141 | |
142 JvmtiThreadState *next() { | |
143 return _next; | |
144 } | |
145 | |
146 // Current stack depth is only valid when is_interp_only_mode() returns true. | |
147 // These functions should only be called at a safepoint - usually called from same thread. | |
148 // Returns the number of Java activations on the stack. | |
149 int cur_stack_depth(); | |
150 void invalidate_cur_stack_depth(); | |
151 void incr_cur_stack_depth(); | |
152 void decr_cur_stack_depth(); | |
153 | |
154 int count_frames(); | |
155 | |
156 inline JavaThread *get_thread() { return _thread; } | |
157 inline bool is_exception_detected() { return _exception_detected; } | |
158 inline bool is_exception_caught() { return _exception_caught; } | |
159 inline void set_exception_detected() { _exception_detected = true; | |
160 _exception_caught = false; } | |
161 inline void set_exception_caught() { _exception_caught = true; | |
162 _exception_detected = false; } | |
163 | |
164 inline void clear_hide_single_stepping() { | |
165 if (_hide_level > 0) { | |
166 _hide_level--; | |
167 } else { | |
168 assert(_hide_single_stepping, "hide_single_stepping is out of phase"); | |
169 _hide_single_stepping = false; | |
170 } | |
171 } | |
172 inline bool hide_single_stepping() { return _hide_single_stepping; } | |
173 inline void set_hide_single_stepping() { | |
174 if (_hide_single_stepping) { | |
175 _hide_level++; | |
176 } else { | |
177 assert(_hide_level == 0, "hide_level is out of phase"); | |
178 _hide_single_stepping = true; | |
179 } | |
180 } | |
181 | |
182 // Step pending flag is set when PopFrame is called and it is cleared | |
183 // when step for the Pop Frame is completed. | |
184 // This logic is used to distinguish b/w step for pop frame and repeat step. | |
185 void set_pending_step_for_popframe() { _pending_step_for_popframe = true; } | |
186 void clr_pending_step_for_popframe() { _pending_step_for_popframe = false; } | |
187 bool is_pending_step_for_popframe() { return _pending_step_for_popframe; } | |
188 void process_pending_step_for_popframe(); | |
189 | |
190 // Step pending flag is set when ForceEarlyReturn is called and it is cleared | |
191 // when step for the ForceEarlyReturn is completed. | |
192 // This logic is used to distinguish b/w step for early return and repeat step. | |
193 void set_pending_step_for_earlyret() { _pending_step_for_earlyret = true; } | |
194 void clr_pending_step_for_earlyret() { _pending_step_for_earlyret = false; } | |
195 bool is_pending_step_for_earlyret() { return _pending_step_for_earlyret; } | |
196 void process_pending_step_for_earlyret(); | |
197 | |
198 // Setter and getter method is used to send redefined class info | |
199 // when class file load hook event is posted. | |
200 // It is set while loading redefined class and cleared before the | |
201 // class file load hook event is posted. | |
202 inline void set_class_being_redefined(KlassHandle *h_class, JvmtiClassLoadKind kind) { | |
203 _class_being_redefined = h_class; | |
204 _class_load_kind = kind; | |
205 } | |
206 | |
207 inline void clear_class_being_redefined() { | |
208 _class_being_redefined = NULL; | |
209 _class_load_kind = jvmti_class_load_kind_load; | |
210 } | |
211 | |
212 inline KlassHandle *get_class_being_redefined() { | |
213 return _class_being_redefined; | |
214 } | |
215 | |
216 inline JvmtiClassLoadKind get_class_load_kind() { | |
217 return _class_load_kind; | |
218 } | |
219 | |
220 // RedefineClasses support | |
221 // The bug 6214132 caused the verification to fail. | |
222 // | |
223 // Below is the detailed description of the fix approach taken: | |
224 // 1. What's done in RedefineClasses() before verification: | |
225 // a) A reference to the class being redefined (_the_class) and a | |
226 // reference to new version of the class (_scratch_class) are | |
227 // saved here for use during the bytecode verification phase of | |
228 // RedefineClasses. See RedefineVerifyMark for how these fields | |
229 // are managed. | |
230 // b) The _java_mirror field from _the_class is copied to the | |
231 // _java_mirror field in _scratch_class. This means that a jclass | |
232 // returned for _the_class or _scratch_class will refer to the | |
233 // same Java mirror. The verifier will see the "one true mirror" | |
234 // for the class being verified. | |
235 // 2. What is done at verification: | |
236 // When the verifier makes calls into the VM to ask questions about | |
237 // the class being verified, it will pass the jclass to JVM_* functions. | |
238 // The jclass is always pointing to the mirror of _the_class. | |
239 // ~28 JVM_* functions called by the verifier for the information | |
240 // about CP entries and klass structure should check the jvmtiThreadState | |
241 // info about equivalent klass versions and use it to replace a klassOop | |
242 // of _the_class with a klassOop of _scratch_class. The function | |
243 // class_to_verify_considering_redefinition() must be called for it. | |
244 // | |
245 // Note again, that this redirection happens only for the verifier thread. | |
246 // Other threads have very small overhead by checking the existence | |
247 // of the jvmtiThreadSate and the information about klasses equivalence. | |
248 // No JNI functions need to be changed, they don't reference the klass guts. | |
249 // The JavaThread pointer is already available in all JVM_* functions | |
250 // used by the verifier, so there is no extra performance issue with it. | |
251 | |
252 private: | |
253 KlassHandle *_the_class_for_redefinition_verification; | |
254 KlassHandle *_scratch_class_for_redefinition_verification; | |
255 | |
256 public: | |
257 inline void set_class_versions_map(KlassHandle *the_class, | |
258 KlassHandle *scratch_class) { | |
259 _the_class_for_redefinition_verification = the_class; | |
260 _scratch_class_for_redefinition_verification = scratch_class; | |
261 } | |
262 | |
263 inline void clear_class_versions_map() { set_class_versions_map(NULL, NULL); } | |
264 | |
265 static inline | |
266 klassOop class_to_verify_considering_redefinition(klassOop klass, | |
267 JavaThread *thread) { | |
268 JvmtiThreadState *state = thread->jvmti_thread_state(); | |
269 if (state != NULL && state->_the_class_for_redefinition_verification != NULL) { | |
270 if ((*(state->_the_class_for_redefinition_verification))() == klass) { | |
271 klass = (*(state->_scratch_class_for_redefinition_verification))(); | |
272 } | |
273 } | |
274 return klass; | |
275 } | |
276 | |
277 // Todo: get rid of this! | |
278 private: | |
279 bool _debuggable; | |
280 public: | |
281 // Should the thread be enumerated by jvmtiInternal::GetAllThreads? | |
282 bool is_debuggable() { return _debuggable; } | |
283 // If a thread cannot be suspended (has no valid last_java_frame) then it gets marked !debuggable | |
284 void set_debuggable(bool debuggable) { _debuggable = debuggable; } | |
285 | |
286 public: | |
287 | |
288 bool may_be_walked(); | |
289 | |
290 // Thread local event collector setter and getter methods. | |
291 JvmtiDynamicCodeEventCollector* get_dynamic_code_event_collector() { | |
292 return _dynamic_code_event_collector; | |
293 } | |
294 JvmtiVMObjectAllocEventCollector* get_vm_object_alloc_event_collector() { | |
295 return _vm_object_alloc_event_collector; | |
296 } | |
297 void set_dynamic_code_event_collector(JvmtiDynamicCodeEventCollector* collector) { | |
298 _dynamic_code_event_collector = collector; | |
299 } | |
300 void set_vm_object_alloc_event_collector(JvmtiVMObjectAllocEventCollector* collector) { | |
301 _vm_object_alloc_event_collector = collector; | |
302 } | |
303 | |
304 | |
305 // | |
306 // Frame routines | |
307 // | |
308 | |
309 public: | |
310 | |
311 // true when the thread was suspended with a pointer to the last Java frame. | |
312 bool has_last_frame() { return _thread->has_last_Java_frame(); } | |
313 | |
314 void update_for_pop_top_frame(); | |
315 | |
316 // already holding JvmtiThreadState_lock - retrieve or create JvmtiThreadState | |
609
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317 // Can return NULL if JavaThread is exiting. |
0 | 318 inline static JvmtiThreadState *state_for_while_locked(JavaThread *thread) { |
319 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
320 | |
321 JvmtiThreadState *state = thread->jvmti_thread_state(); | |
322 if (state == NULL) { | |
608
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323 if (thread->is_exiting()) { |
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324 // don't add a JvmtiThreadState to a thread that is exiting |
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325 return NULL; |
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326 } |
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327 |
0 | 328 state = new JvmtiThreadState(thread); |
329 } | |
330 return state; | |
331 } | |
332 | |
333 // retrieve or create JvmtiThreadState | |
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334 // Can return NULL if JavaThread is exiting. |
0 | 335 inline static JvmtiThreadState *state_for(JavaThread *thread) { |
336 JvmtiThreadState *state = thread->jvmti_thread_state(); | |
337 if (state == NULL) { | |
338 MutexLocker mu(JvmtiThreadState_lock); | |
339 // check again with the lock held | |
340 state = state_for_while_locked(thread); | |
341 } else { | |
342 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
343 } | |
344 return state; | |
345 } | |
346 | |
347 // JVMTI ForceEarlyReturn support | |
348 | |
349 // This is set to earlyret_pending to signal that top Java frame | |
350 // should be returned immediately | |
351 public: | |
352 int _earlyret_state; | |
353 TosState _earlyret_tos; | |
354 jvalue _earlyret_value; | |
355 oop _earlyret_oop; // Used to return an oop result into Java code from | |
356 // ForceEarlyReturnObject, GC-preserved | |
357 | |
358 // Setting and clearing earlyret_state | |
359 // earlyret_pending indicates that a ForceEarlyReturn() has been | |
360 // requested and not yet been completed. | |
361 public: | |
362 enum EarlyretState { | |
363 earlyret_inactive = 0, | |
364 earlyret_pending = 1 | |
365 }; | |
366 | |
367 void set_earlyret_pending(void) { _earlyret_state = earlyret_pending; } | |
368 void clr_earlyret_pending(void) { _earlyret_state = earlyret_inactive; } | |
369 bool is_earlyret_pending(void) { return (_earlyret_state == earlyret_pending); } | |
370 | |
371 TosState earlyret_tos() { return _earlyret_tos; } | |
372 oop earlyret_oop() const { return _earlyret_oop; } | |
373 void set_earlyret_oop (oop x) { _earlyret_oop = x; } | |
374 jvalue earlyret_value() { return _earlyret_value; } | |
375 void set_earlyret_value(jvalue val, TosState tos) { _earlyret_tos = tos; _earlyret_value = val; } | |
376 void clr_earlyret_value() { _earlyret_tos = ilgl; _earlyret_value.j = 0L; } | |
377 | |
378 static ByteSize earlyret_state_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_state); } | |
379 static ByteSize earlyret_tos_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_tos); } | |
380 static ByteSize earlyret_oop_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_oop); } | |
381 static ByteSize earlyret_value_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_value); } | |
382 | |
383 void oops_do(OopClosure* f); // GC support | |
384 }; | |
385 | |
386 class RedefineVerifyMark : public StackObj { | |
387 private: | |
388 JvmtiThreadState *_state; | |
389 | |
390 public: | |
391 RedefineVerifyMark(KlassHandle *the_class, KlassHandle *scratch_class, | |
392 JvmtiThreadState *state) : _state(state) | |
393 { | |
394 _state->set_class_versions_map(the_class, scratch_class); | |
395 (*scratch_class)->set_java_mirror((*the_class)->java_mirror()); | |
396 } | |
397 | |
398 ~RedefineVerifyMark() { | |
399 _state->clear_class_versions_map(); | |
400 } | |
401 }; | |
402 | |
403 #endif /* _JAVA_JVMTITHREADSTATE_H_ */ |