Mercurial > hg > graal-compiler
comparison src/share/vm/prims/jvmtiEnvBase.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | dbec32712472 |
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1 /* | |
2 * Copyright 2003-2007 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 # include "incls/_precompiled.incl" | |
25 # include "incls/_jvmtiEnvBase.cpp.incl" | |
26 | |
27 | |
28 /////////////////////////////////////////////////////////////// | |
29 // | |
30 // JvmtiEnvBase | |
31 // | |
32 | |
33 JvmtiEnvBase* JvmtiEnvBase::_head_environment = NULL; | |
34 | |
35 bool JvmtiEnvBase::_globally_initialized = false; | |
36 volatile bool JvmtiEnvBase::_needs_clean_up = false; | |
37 | |
38 jvmtiPhase JvmtiEnvBase::_phase = JVMTI_PHASE_PRIMORDIAL; | |
39 | |
40 volatile int JvmtiEnvBase::_dying_thread_env_iteration_count = 0; | |
41 | |
42 extern jvmtiInterface_1_ jvmti_Interface; | |
43 extern jvmtiInterface_1_ jvmtiTrace_Interface; | |
44 | |
45 | |
46 // perform initializations that must occur before any JVMTI environments | |
47 // are released but which should only be initialized once (no matter | |
48 // how many environments are created). | |
49 void | |
50 JvmtiEnvBase::globally_initialize() { | |
51 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
52 assert(_globally_initialized == false, "bad call"); | |
53 | |
54 JvmtiManageCapabilities::initialize(); | |
55 | |
56 #ifndef JVMTI_KERNEL | |
57 // register extension functions and events | |
58 JvmtiExtensions::register_extensions(); | |
59 #endif // !JVMTI_KERNEL | |
60 | |
61 #ifdef JVMTI_TRACE | |
62 JvmtiTrace::initialize(); | |
63 #endif | |
64 | |
65 _globally_initialized = true; | |
66 } | |
67 | |
68 | |
69 void | |
70 JvmtiEnvBase::initialize() { | |
71 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
72 | |
73 // Add this environment to the end of the environment list (order is important) | |
74 { | |
75 // This block of code must not contain any safepoints, as list deallocation | |
76 // (which occurs at a safepoint) cannot occur simultaneously with this list | |
77 // addition. Note: No_Safepoint_Verifier cannot, currently, be used before | |
78 // threads exist. | |
79 JvmtiEnvIterator it; | |
80 JvmtiEnvBase *previous_env = NULL; | |
81 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
82 previous_env = env; | |
83 } | |
84 if (previous_env == NULL) { | |
85 _head_environment = this; | |
86 } else { | |
87 previous_env->set_next_environment(this); | |
88 } | |
89 } | |
90 | |
91 if (_globally_initialized == false) { | |
92 globally_initialize(); | |
93 } | |
94 } | |
95 | |
96 | |
97 JvmtiEnvBase::JvmtiEnvBase() : _env_event_enable() { | |
98 _env_local_storage = NULL; | |
99 _tag_map = NULL; | |
100 _native_method_prefix_count = 0; | |
101 _native_method_prefixes = NULL; | |
102 _next = NULL; | |
103 _class_file_load_hook_ever_enabled = false; | |
104 | |
105 // Moot since ClassFileLoadHook not yet enabled. | |
106 // But "true" will give a more predictable ClassFileLoadHook behavior | |
107 // for environment creation during ClassFileLoadHook. | |
108 _is_retransformable = true; | |
109 | |
110 // all callbacks initially NULL | |
111 memset(&_event_callbacks,0,sizeof(jvmtiEventCallbacks)); | |
112 | |
113 // all capabilities initially off | |
114 memset(&_current_capabilities, 0, sizeof(_current_capabilities)); | |
115 | |
116 // all prohibited capabilities initially off | |
117 memset(&_prohibited_capabilities, 0, sizeof(_prohibited_capabilities)); | |
118 | |
119 _magic = JVMTI_MAGIC; | |
120 | |
121 JvmtiEventController::env_initialize((JvmtiEnv*)this); | |
122 | |
123 #ifdef JVMTI_TRACE | |
124 _jvmti_external.functions = strlen(TraceJVMTI)? &jvmtiTrace_Interface : &jvmti_Interface; | |
125 #else | |
126 _jvmti_external.functions = &jvmti_Interface; | |
127 #endif | |
128 } | |
129 | |
130 | |
131 void | |
132 JvmtiEnvBase::dispose() { | |
133 | |
134 #ifdef JVMTI_TRACE | |
135 JvmtiTrace::shutdown(); | |
136 #endif | |
137 | |
138 // Dispose of event info and let the event controller call us back | |
139 // in a locked state (env_dispose, below) | |
140 JvmtiEventController::env_dispose(this); | |
141 } | |
142 | |
143 void | |
144 JvmtiEnvBase::env_dispose() { | |
145 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
146 | |
147 // We have been entered with all events disabled on this environment. | |
148 // A race to re-enable events (by setting callbacks) is prevented by | |
149 // checking for a valid environment when setting callbacks (while | |
150 // holding the JvmtiThreadState_lock). | |
151 | |
152 // Mark as invalid. | |
153 _magic = DISPOSED_MAGIC; | |
154 | |
155 // Relinquish all capabilities. | |
156 jvmtiCapabilities *caps = get_capabilities(); | |
157 JvmtiManageCapabilities::relinquish_capabilities(caps, caps, caps); | |
158 | |
159 // Same situation as with events (see above) | |
160 set_native_method_prefixes(0, NULL); | |
161 | |
162 #ifndef JVMTI_KERNEL | |
163 JvmtiTagMap* tag_map_to_deallocate = _tag_map; | |
164 set_tag_map(NULL); | |
165 // A tag map can be big, deallocate it now | |
166 if (tag_map_to_deallocate != NULL) { | |
167 delete tag_map_to_deallocate; | |
168 } | |
169 #endif // !JVMTI_KERNEL | |
170 | |
171 _needs_clean_up = true; | |
172 } | |
173 | |
174 | |
175 JvmtiEnvBase::~JvmtiEnvBase() { | |
176 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
177 | |
178 // There is a small window of time during which the tag map of a | |
179 // disposed environment could have been reallocated. | |
180 // Make sure it is gone. | |
181 #ifndef JVMTI_KERNEL | |
182 JvmtiTagMap* tag_map_to_deallocate = _tag_map; | |
183 set_tag_map(NULL); | |
184 // A tag map can be big, deallocate it now | |
185 if (tag_map_to_deallocate != NULL) { | |
186 delete tag_map_to_deallocate; | |
187 } | |
188 #endif // !JVMTI_KERNEL | |
189 | |
190 _magic = BAD_MAGIC; | |
191 } | |
192 | |
193 | |
194 void | |
195 JvmtiEnvBase::periodic_clean_up() { | |
196 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
197 | |
198 // JvmtiEnvBase reference is saved in JvmtiEnvThreadState. So | |
199 // clean up JvmtiThreadState before deleting JvmtiEnv pointer. | |
200 JvmtiThreadState::periodic_clean_up(); | |
201 | |
202 // Unlink all invalid environments from the list of environments | |
203 // and deallocate them | |
204 JvmtiEnvIterator it; | |
205 JvmtiEnvBase* previous_env = NULL; | |
206 JvmtiEnvBase* env = it.first(); | |
207 while (env != NULL) { | |
208 if (env->is_valid()) { | |
209 previous_env = env; | |
210 env = it.next(env); | |
211 } else { | |
212 // This one isn't valid, remove it from the list and deallocate it | |
213 JvmtiEnvBase* defunct_env = env; | |
214 env = it.next(env); | |
215 if (previous_env == NULL) { | |
216 _head_environment = env; | |
217 } else { | |
218 previous_env->set_next_environment(env); | |
219 } | |
220 delete defunct_env; | |
221 } | |
222 } | |
223 | |
224 } | |
225 | |
226 | |
227 void | |
228 JvmtiEnvBase::check_for_periodic_clean_up() { | |
229 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
230 | |
231 class ThreadInsideIterationClosure: public ThreadClosure { | |
232 private: | |
233 bool _inside; | |
234 public: | |
235 ThreadInsideIterationClosure() : _inside(false) {}; | |
236 | |
237 void do_thread(Thread* thread) { | |
238 _inside |= thread->is_inside_jvmti_env_iteration(); | |
239 } | |
240 | |
241 bool is_inside_jvmti_env_iteration() { | |
242 return _inside; | |
243 } | |
244 }; | |
245 | |
246 if (_needs_clean_up) { | |
247 // Check if we are currently iterating environment, | |
248 // deallocation should not occur if we are | |
249 ThreadInsideIterationClosure tiic; | |
250 Threads::threads_do(&tiic); | |
251 if (!tiic.is_inside_jvmti_env_iteration() && | |
252 !is_inside_dying_thread_env_iteration()) { | |
253 _needs_clean_up = false; | |
254 JvmtiEnvBase::periodic_clean_up(); | |
255 } | |
256 } | |
257 } | |
258 | |
259 | |
260 void | |
261 JvmtiEnvBase::record_first_time_class_file_load_hook_enabled() { | |
262 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), | |
263 "sanity check"); | |
264 | |
265 if (!_class_file_load_hook_ever_enabled) { | |
266 _class_file_load_hook_ever_enabled = true; | |
267 | |
268 if (get_capabilities()->can_retransform_classes) { | |
269 _is_retransformable = true; | |
270 } else { | |
271 _is_retransformable = false; | |
272 | |
273 // cannot add retransform capability after ClassFileLoadHook has been enabled | |
274 get_prohibited_capabilities()->can_retransform_classes = 1; | |
275 } | |
276 } | |
277 } | |
278 | |
279 | |
280 void | |
281 JvmtiEnvBase::record_class_file_load_hook_enabled() { | |
282 if (!_class_file_load_hook_ever_enabled) { | |
283 if (Threads::number_of_threads() == 0) { | |
284 record_first_time_class_file_load_hook_enabled(); | |
285 } else { | |
286 MutexLocker mu(JvmtiThreadState_lock); | |
287 record_first_time_class_file_load_hook_enabled(); | |
288 } | |
289 } | |
290 } | |
291 | |
292 | |
293 jvmtiError | |
294 JvmtiEnvBase::set_native_method_prefixes(jint prefix_count, char** prefixes) { | |
295 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), | |
296 "sanity check"); | |
297 | |
298 int old_prefix_count = get_native_method_prefix_count(); | |
299 char **old_prefixes = get_native_method_prefixes(); | |
300 | |
301 // allocate and install the new prefixex | |
302 if (prefix_count == 0 || !is_valid()) { | |
303 _native_method_prefix_count = 0; | |
304 _native_method_prefixes = NULL; | |
305 } else { | |
306 // there are prefixes, allocate an array to hold them, and fill it | |
307 char** new_prefixes = (char**)os::malloc((prefix_count) * sizeof(char*)); | |
308 if (new_prefixes == NULL) { | |
309 return JVMTI_ERROR_OUT_OF_MEMORY; | |
310 } | |
311 for (int i = 0; i < prefix_count; i++) { | |
312 char* prefix = prefixes[i]; | |
313 if (prefix == NULL) { | |
314 for (int j = 0; j < (i-1); j++) { | |
315 os::free(new_prefixes[j]); | |
316 } | |
317 os::free(new_prefixes); | |
318 return JVMTI_ERROR_NULL_POINTER; | |
319 } | |
320 prefix = os::strdup(prefixes[i]); | |
321 if (prefix == NULL) { | |
322 for (int j = 0; j < (i-1); j++) { | |
323 os::free(new_prefixes[j]); | |
324 } | |
325 os::free(new_prefixes); | |
326 return JVMTI_ERROR_OUT_OF_MEMORY; | |
327 } | |
328 new_prefixes[i] = prefix; | |
329 } | |
330 _native_method_prefix_count = prefix_count; | |
331 _native_method_prefixes = new_prefixes; | |
332 } | |
333 | |
334 // now that we know the new prefixes have been successfully installed we can | |
335 // safely remove the old ones | |
336 if (old_prefix_count != 0) { | |
337 for (int i = 0; i < old_prefix_count; i++) { | |
338 os::free(old_prefixes[i]); | |
339 } | |
340 os::free(old_prefixes); | |
341 } | |
342 | |
343 return JVMTI_ERROR_NONE; | |
344 } | |
345 | |
346 | |
347 // Collect all the prefixes which have been set in any JVM TI environments | |
348 // by the SetNativeMethodPrefix(es) functions. Be sure to maintain the | |
349 // order of environments and the order of prefixes within each environment. | |
350 // Return in a resource allocated array. | |
351 char** | |
352 JvmtiEnvBase::get_all_native_method_prefixes(int* count_ptr) { | |
353 assert(Threads::number_of_threads() == 0 || | |
354 SafepointSynchronize::is_at_safepoint() || | |
355 JvmtiThreadState_lock->is_locked(), | |
356 "sanity check"); | |
357 | |
358 int total_count = 0; | |
359 GrowableArray<char*>* prefix_array =new GrowableArray<char*>(5); | |
360 | |
361 JvmtiEnvIterator it; | |
362 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
363 int prefix_count = env->get_native_method_prefix_count(); | |
364 char** prefixes = env->get_native_method_prefixes(); | |
365 for (int j = 0; j < prefix_count; j++) { | |
366 // retrieve a prefix and so that it is safe against asynchronous changes | |
367 // copy it into the resource area | |
368 char* prefix = prefixes[j]; | |
369 char* prefix_copy = NEW_RESOURCE_ARRAY(char, strlen(prefix)+1); | |
370 strcpy(prefix_copy, prefix); | |
371 prefix_array->at_put_grow(total_count++, prefix_copy); | |
372 } | |
373 } | |
374 | |
375 char** all_prefixes = NEW_RESOURCE_ARRAY(char*, total_count); | |
376 char** p = all_prefixes; | |
377 for (int i = 0; i < total_count; ++i) { | |
378 *p++ = prefix_array->at(i); | |
379 } | |
380 *count_ptr = total_count; | |
381 return all_prefixes; | |
382 } | |
383 | |
384 void | |
385 JvmtiEnvBase::set_event_callbacks(const jvmtiEventCallbacks* callbacks, | |
386 jint size_of_callbacks) { | |
387 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
388 | |
389 size_t byte_cnt = sizeof(jvmtiEventCallbacks); | |
390 | |
391 // clear in either case to be sure we got any gap between sizes | |
392 memset(&_event_callbacks, 0, byte_cnt); | |
393 | |
394 // Now that JvmtiThreadState_lock is held, prevent a possible race condition where events | |
395 // are re-enabled by a call to set event callbacks where the DisposeEnvironment | |
396 // occurs after the boiler-plate environment check and before the lock is acquired. | |
397 if (callbacks != NULL && is_valid()) { | |
398 if (size_of_callbacks < (jint)byte_cnt) { | |
399 byte_cnt = size_of_callbacks; | |
400 } | |
401 memcpy(&_event_callbacks, callbacks, byte_cnt); | |
402 } | |
403 } | |
404 | |
405 // Called from JVMTI entry points which perform stack walking. If the | |
406 // associated JavaThread is the current thread, then wait_for_suspend | |
407 // is not used. Otherwise, it determines if we should wait for the | |
408 // "other" thread to complete external suspension. (NOTE: in future | |
409 // releases the suspension mechanism should be reimplemented so this | |
410 // is not necessary.) | |
411 // | |
412 bool | |
413 JvmtiEnvBase::is_thread_fully_suspended(JavaThread* thr, bool wait_for_suspend, uint32_t *bits) { | |
414 // "other" threads require special handling | |
415 if (thr != JavaThread::current()) { | |
416 if (wait_for_suspend) { | |
417 // We are allowed to wait for the external suspend to complete | |
418 // so give the other thread a chance to get suspended. | |
419 if (!thr->wait_for_ext_suspend_completion(SuspendRetryCount, | |
420 SuspendRetryDelay, bits)) { | |
421 // didn't make it so let the caller know | |
422 return false; | |
423 } | |
424 } | |
425 // We aren't allowed to wait for the external suspend to complete | |
426 // so if the other thread isn't externally suspended we need to | |
427 // let the caller know. | |
428 else if (!thr->is_ext_suspend_completed_with_lock(bits)) { | |
429 return false; | |
430 } | |
431 } | |
432 | |
433 return true; | |
434 } | |
435 | |
436 | |
437 // In the fullness of time, all users of the method should instead | |
438 // directly use allocate, besides being cleaner and faster, this will | |
439 // mean much better out of memory handling | |
440 unsigned char * | |
441 JvmtiEnvBase::jvmtiMalloc(jlong size) { | |
442 unsigned char* mem; | |
443 jvmtiError result = allocate(size, &mem); | |
444 assert(result == JVMTI_ERROR_NONE, "Allocate failed"); | |
445 return mem; | |
446 } | |
447 | |
448 | |
449 // | |
450 // Threads | |
451 // | |
452 | |
453 jobject * | |
454 JvmtiEnvBase::new_jobjectArray(int length, Handle *handles) { | |
455 if (length == 0) { | |
456 return NULL; | |
457 } | |
458 | |
459 jobject *objArray = (jobject *) jvmtiMalloc(sizeof(jobject) * length); | |
460 NULL_CHECK(objArray, NULL); | |
461 | |
462 for (int i=0; i<length; i++) { | |
463 objArray[i] = jni_reference(handles[i]); | |
464 } | |
465 return objArray; | |
466 } | |
467 | |
468 jthread * | |
469 JvmtiEnvBase::new_jthreadArray(int length, Handle *handles) { | |
470 return (jthread *) new_jobjectArray(length,handles); | |
471 } | |
472 | |
473 jthreadGroup * | |
474 JvmtiEnvBase::new_jthreadGroupArray(int length, Handle *handles) { | |
475 return (jthreadGroup *) new_jobjectArray(length,handles); | |
476 } | |
477 | |
478 | |
479 JavaThread * | |
480 JvmtiEnvBase::get_JavaThread(jthread jni_thread) { | |
481 oop t = JNIHandles::resolve_external_guard(jni_thread); | |
482 if (t == NULL || !t->is_a(SystemDictionary::thread_klass())) { | |
483 return NULL; | |
484 } | |
485 // The following returns NULL if the thread has not yet run or is in | |
486 // process of exiting | |
487 return java_lang_Thread::thread(t); | |
488 } | |
489 | |
490 | |
491 // update the access_flags for the field in the klass | |
492 void | |
493 JvmtiEnvBase::update_klass_field_access_flag(fieldDescriptor *fd) { | |
494 instanceKlass* ik = instanceKlass::cast(fd->field_holder()); | |
495 typeArrayOop fields = ik->fields(); | |
496 fields->ushort_at_put(fd->index(), (jushort)fd->access_flags().as_short()); | |
497 } | |
498 | |
499 | |
500 // return the vframe on the specified thread and depth, NULL if no such frame | |
501 vframe* | |
502 JvmtiEnvBase::vframeFor(JavaThread* java_thread, jint depth) { | |
503 if (!java_thread->has_last_Java_frame()) { | |
504 return NULL; | |
505 } | |
506 RegisterMap reg_map(java_thread); | |
507 vframe *vf = java_thread->last_java_vframe(®_map); | |
508 int d = 0; | |
509 while ((vf != NULL) && (d < depth)) { | |
510 vf = vf->java_sender(); | |
511 d++; | |
512 } | |
513 return vf; | |
514 } | |
515 | |
516 | |
517 // | |
518 // utilities: JNI objects | |
519 // | |
520 | |
521 | |
522 jclass | |
523 JvmtiEnvBase::get_jni_class_non_null(klassOop k) { | |
524 assert(k != NULL, "k != NULL"); | |
525 return (jclass)jni_reference(Klass::cast(k)->java_mirror()); | |
526 } | |
527 | |
528 #ifndef JVMTI_KERNEL | |
529 | |
530 // | |
531 // Field Information | |
532 // | |
533 | |
534 bool | |
535 JvmtiEnvBase::get_field_descriptor(klassOop k, jfieldID field, fieldDescriptor* fd) { | |
536 if (!jfieldIDWorkaround::is_valid_jfieldID(k, field)) { | |
537 return false; | |
538 } | |
539 bool found = false; | |
540 if (jfieldIDWorkaround::is_static_jfieldID(field)) { | |
541 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(field); | |
542 int offset = id->offset(); | |
543 klassOop holder = id->holder(); | |
544 found = instanceKlass::cast(holder)->find_local_field_from_offset(offset, true, fd); | |
545 } else { | |
546 // Non-static field. The fieldID is really the offset of the field within the object. | |
547 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, field); | |
548 found = instanceKlass::cast(k)->find_field_from_offset(offset, false, fd); | |
549 } | |
550 return found; | |
551 } | |
552 | |
553 // | |
554 // Object Monitor Information | |
555 // | |
556 | |
557 // | |
558 // Count the number of objects for a lightweight monitor. The hobj | |
559 // parameter is object that owns the monitor so this routine will | |
560 // count the number of times the same object was locked by frames | |
561 // in java_thread. | |
562 // | |
563 jint | |
564 JvmtiEnvBase::count_locked_objects(JavaThread *java_thread, Handle hobj) { | |
565 jint ret = 0; | |
566 if (!java_thread->has_last_Java_frame()) { | |
567 return ret; // no Java frames so no monitors | |
568 } | |
569 | |
570 ResourceMark rm; | |
571 HandleMark hm; | |
572 RegisterMap reg_map(java_thread); | |
573 | |
574 for(javaVFrame *jvf=java_thread->last_java_vframe(®_map); jvf != NULL; | |
575 jvf = jvf->java_sender()) { | |
576 GrowableArray<MonitorInfo*>* mons = jvf->monitors(); | |
577 if (!mons->is_empty()) { | |
578 for (int i = 0; i < mons->length(); i++) { | |
579 MonitorInfo *mi = mons->at(i); | |
580 | |
581 // see if owner of the monitor is our object | |
582 if (mi->owner() != NULL && mi->owner() == hobj()) { | |
583 ret++; | |
584 } | |
585 } | |
586 } | |
587 } | |
588 return ret; | |
589 } | |
590 | |
591 | |
592 | |
593 jvmtiError | |
594 JvmtiEnvBase::get_current_contended_monitor(JavaThread *calling_thread, JavaThread *java_thread, jobject *monitor_ptr) { | |
595 #ifdef ASSERT | |
596 uint32_t debug_bits = 0; | |
597 #endif | |
598 assert((SafepointSynchronize::is_at_safepoint() || | |
599 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
600 "at safepoint or target thread is suspended"); | |
601 oop obj = NULL; | |
602 ObjectMonitor *mon = java_thread->current_waiting_monitor(); | |
603 if (mon == NULL) { | |
604 // thread is not doing an Object.wait() call | |
605 mon = java_thread->current_pending_monitor(); | |
606 if (mon != NULL) { | |
607 // The thread is trying to enter() or raw_enter() an ObjectMonitor. | |
608 obj = (oop)mon->object(); | |
609 // If obj == NULL, then ObjectMonitor is raw which doesn't count | |
610 // as contended for this API | |
611 } | |
612 // implied else: no contended ObjectMonitor | |
613 } else { | |
614 // thread is doing an Object.wait() call | |
615 obj = (oop)mon->object(); | |
616 assert(obj != NULL, "Object.wait() should have an object"); | |
617 } | |
618 | |
619 if (obj == NULL) { | |
620 *monitor_ptr = NULL; | |
621 } else { | |
622 HandleMark hm; | |
623 Handle hobj(obj); | |
624 *monitor_ptr = jni_reference(calling_thread, hobj); | |
625 } | |
626 return JVMTI_ERROR_NONE; | |
627 } | |
628 | |
629 | |
630 jvmtiError | |
631 JvmtiEnvBase::get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread, | |
632 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list) { | |
633 jvmtiError err = JVMTI_ERROR_NONE; | |
634 #ifdef ASSERT | |
635 uint32_t debug_bits = 0; | |
636 #endif | |
637 assert((SafepointSynchronize::is_at_safepoint() || | |
638 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
639 "at safepoint or target thread is suspended"); | |
640 | |
641 if (java_thread->has_last_Java_frame()) { | |
642 ResourceMark rm; | |
643 HandleMark hm; | |
644 RegisterMap reg_map(java_thread); | |
645 | |
646 int depth = 0; | |
647 for (javaVFrame *jvf = java_thread->last_java_vframe(®_map); jvf != NULL; | |
648 jvf = jvf->java_sender()) { | |
649 if (depth++ < MaxJavaStackTraceDepth) { // check for stack too deep | |
650 // add locked objects for this frame into list | |
651 err = get_locked_objects_in_frame(calling_thread, java_thread, jvf, owned_monitors_list, depth-1); | |
652 if (err != JVMTI_ERROR_NONE) { | |
653 return err; | |
654 } | |
655 } | |
656 } | |
657 } | |
658 | |
659 // Get off stack monitors. (e.g. acquired via jni MonitorEnter). | |
660 JvmtiMonitorClosure jmc(java_thread, calling_thread, owned_monitors_list, this); | |
661 ObjectSynchronizer::monitors_iterate(&jmc); | |
662 err = jmc.error(); | |
663 | |
664 return err; | |
665 } | |
666 | |
667 // Save JNI local handles for any objects that this frame owns. | |
668 jvmtiError | |
669 JvmtiEnvBase::get_locked_objects_in_frame(JavaThread* calling_thread, JavaThread* java_thread, | |
670 javaVFrame *jvf, GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, int stack_depth) { | |
671 jvmtiError err = JVMTI_ERROR_NONE; | |
672 ResourceMark rm; | |
673 | |
674 GrowableArray<MonitorInfo*>* mons = jvf->monitors(); | |
675 if (mons->is_empty()) { | |
676 return err; // this javaVFrame holds no monitors | |
677 } | |
678 | |
679 HandleMark hm; | |
680 oop wait_obj = NULL; | |
681 { | |
682 // save object of current wait() call (if any) for later comparison | |
683 ObjectMonitor *mon = java_thread->current_waiting_monitor(); | |
684 if (mon != NULL) { | |
685 wait_obj = (oop)mon->object(); | |
686 } | |
687 } | |
688 oop pending_obj = NULL; | |
689 { | |
690 // save object of current enter() call (if any) for later comparison | |
691 ObjectMonitor *mon = java_thread->current_pending_monitor(); | |
692 if (mon != NULL) { | |
693 pending_obj = (oop)mon->object(); | |
694 } | |
695 } | |
696 | |
697 for (int i = 0; i < mons->length(); i++) { | |
698 MonitorInfo *mi = mons->at(i); | |
699 | |
700 oop obj = mi->owner(); | |
701 if (obj == NULL) { | |
702 // this monitor doesn't have an owning object so skip it | |
703 continue; | |
704 } | |
705 | |
706 if (wait_obj == obj) { | |
707 // the thread is waiting on this monitor so it isn't really owned | |
708 continue; | |
709 } | |
710 | |
711 if (pending_obj == obj) { | |
712 // the thread is pending on this monitor so it isn't really owned | |
713 continue; | |
714 } | |
715 | |
716 if (owned_monitors_list->length() > 0) { | |
717 // Our list has at least one object on it so we have to check | |
718 // for recursive object locking | |
719 bool found = false; | |
720 for (int j = 0; j < owned_monitors_list->length(); j++) { | |
721 jobject jobj = ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(j))->monitor; | |
722 oop check = JNIHandles::resolve(jobj); | |
723 if (check == obj) { | |
724 found = true; // we found the object | |
725 break; | |
726 } | |
727 } | |
728 | |
729 if (found) { | |
730 // already have this object so don't include it | |
731 continue; | |
732 } | |
733 } | |
734 | |
735 // add the owning object to our list | |
736 jvmtiMonitorStackDepthInfo *jmsdi; | |
737 err = allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); | |
738 if (err != JVMTI_ERROR_NONE) { | |
739 return err; | |
740 } | |
741 Handle hobj(obj); | |
742 jmsdi->monitor = jni_reference(calling_thread, hobj); | |
743 jmsdi->stack_depth = stack_depth; | |
744 owned_monitors_list->append(jmsdi); | |
745 } | |
746 | |
747 return err; | |
748 } | |
749 | |
750 jvmtiError | |
751 JvmtiEnvBase::get_stack_trace(JavaThread *java_thread, | |
752 jint start_depth, jint max_count, | |
753 jvmtiFrameInfo* frame_buffer, jint* count_ptr) { | |
754 #ifdef ASSERT | |
755 uint32_t debug_bits = 0; | |
756 #endif | |
757 assert((SafepointSynchronize::is_at_safepoint() || | |
758 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
759 "at safepoint or target thread is suspended"); | |
760 int count = 0; | |
761 if (java_thread->has_last_Java_frame()) { | |
762 RegisterMap reg_map(java_thread); | |
763 Thread* current_thread = Thread::current(); | |
764 ResourceMark rm(current_thread); | |
765 javaVFrame *jvf = java_thread->last_java_vframe(®_map); | |
766 HandleMark hm(current_thread); | |
767 if (start_depth != 0) { | |
768 if (start_depth > 0) { | |
769 for (int j = 0; j < start_depth && jvf != NULL; j++) { | |
770 jvf = jvf->java_sender(); | |
771 } | |
772 if (jvf == NULL) { | |
773 // start_depth is deeper than the stack depth | |
774 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
775 } | |
776 } else { // start_depth < 0 | |
777 // we are referencing the starting depth based on the oldest | |
778 // part of the stack. | |
779 // optimize to limit the number of times that java_sender() is called | |
780 javaVFrame *jvf_cursor = jvf; | |
781 javaVFrame *jvf_prev = NULL; | |
782 javaVFrame *jvf_prev_prev; | |
783 int j = 0; | |
784 while (jvf_cursor != NULL) { | |
785 jvf_prev_prev = jvf_prev; | |
786 jvf_prev = jvf_cursor; | |
787 for (j = 0; j > start_depth && jvf_cursor != NULL; j--) { | |
788 jvf_cursor = jvf_cursor->java_sender(); | |
789 } | |
790 } | |
791 if (j == start_depth) { | |
792 // previous pointer is exactly where we want to start | |
793 jvf = jvf_prev; | |
794 } else { | |
795 // we need to back up further to get to the right place | |
796 if (jvf_prev_prev == NULL) { | |
797 // the -start_depth is greater than the stack depth | |
798 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
799 } | |
800 // j now is the number of frames on the stack starting with | |
801 // jvf_prev, we start from jvf_prev_prev and move older on | |
802 // the stack that many, the result is -start_depth frames | |
803 // remaining. | |
804 jvf = jvf_prev_prev; | |
805 for (; j < 0; j++) { | |
806 jvf = jvf->java_sender(); | |
807 } | |
808 } | |
809 } | |
810 } | |
811 for (; count < max_count && jvf != NULL; count++) { | |
812 frame_buffer[count].method = jvf->method()->jmethod_id(); | |
813 frame_buffer[count].location = (jvf->method()->is_native() ? -1 : jvf->bci()); | |
814 jvf = jvf->java_sender(); | |
815 } | |
816 } else { | |
817 if (start_depth != 0) { | |
818 // no frames and there is a starting depth | |
819 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
820 } | |
821 } | |
822 *count_ptr = count; | |
823 return JVMTI_ERROR_NONE; | |
824 } | |
825 | |
826 jvmtiError | |
827 JvmtiEnvBase::get_frame_count(JvmtiThreadState *state, jint *count_ptr) { | |
828 assert((state != NULL), | |
829 "JavaThread should create JvmtiThreadState before calling this method"); | |
830 *count_ptr = state->count_frames(); | |
831 return JVMTI_ERROR_NONE; | |
832 } | |
833 | |
834 jvmtiError | |
835 JvmtiEnvBase::get_frame_location(JavaThread *java_thread, jint depth, | |
836 jmethodID* method_ptr, jlocation* location_ptr) { | |
837 #ifdef ASSERT | |
838 uint32_t debug_bits = 0; | |
839 #endif | |
840 assert((SafepointSynchronize::is_at_safepoint() || | |
841 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
842 "at safepoint or target thread is suspended"); | |
843 Thread* current_thread = Thread::current(); | |
844 ResourceMark rm(current_thread); | |
845 | |
846 vframe *vf = vframeFor(java_thread, depth); | |
847 if (vf == NULL) { | |
848 return JVMTI_ERROR_NO_MORE_FRAMES; | |
849 } | |
850 | |
851 // vframeFor should return a java frame. If it doesn't | |
852 // it means we've got an internal error and we return the | |
853 // error in product mode. In debug mode we will instead | |
854 // attempt to cast the vframe to a javaVFrame and will | |
855 // cause an assertion/crash to allow further diagnosis. | |
856 #ifdef PRODUCT | |
857 if (!vf->is_java_frame()) { | |
858 return JVMTI_ERROR_INTERNAL; | |
859 } | |
860 #endif | |
861 | |
862 HandleMark hm(current_thread); | |
863 javaVFrame *jvf = javaVFrame::cast(vf); | |
864 methodOop method = jvf->method(); | |
865 if (method->is_native()) { | |
866 *location_ptr = -1; | |
867 } else { | |
868 *location_ptr = jvf->bci(); | |
869 } | |
870 *method_ptr = method->jmethod_id(); | |
871 | |
872 return JVMTI_ERROR_NONE; | |
873 } | |
874 | |
875 | |
876 jvmtiError | |
877 JvmtiEnvBase::get_object_monitor_usage(JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) { | |
878 HandleMark hm; | |
879 Handle hobj; | |
880 | |
881 bool at_safepoint = SafepointSynchronize::is_at_safepoint(); | |
882 | |
883 // Check arguments | |
884 { | |
885 oop mirror = JNIHandles::resolve_external_guard(object); | |
886 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT); | |
887 NULL_CHECK(info_ptr, JVMTI_ERROR_NULL_POINTER); | |
888 | |
889 hobj = Handle(mirror); | |
890 } | |
891 | |
892 JavaThread *owning_thread = NULL; | |
893 ObjectMonitor *mon = NULL; | |
894 jvmtiMonitorUsage ret = { | |
895 NULL, 0, 0, NULL, 0, NULL | |
896 }; | |
897 | |
898 uint32_t debug_bits = 0; | |
899 // first derive the object's owner and entry_count (if any) | |
900 { | |
901 // Revoke any biases before querying the mark word | |
902 if (SafepointSynchronize::is_at_safepoint()) { | |
903 BiasedLocking::revoke_at_safepoint(hobj); | |
904 } else { | |
905 BiasedLocking::revoke_and_rebias(hobj, false, calling_thread); | |
906 } | |
907 | |
908 address owner = NULL; | |
909 { | |
910 markOop mark = hobj()->mark(); | |
911 | |
912 if (!mark->has_monitor()) { | |
913 // this object has a lightweight monitor | |
914 | |
915 if (mark->has_locker()) { | |
916 owner = (address)mark->locker(); // save the address of the Lock word | |
917 } | |
918 // implied else: no owner | |
919 } else { | |
920 // this object has a heavyweight monitor | |
921 mon = mark->monitor(); | |
922 | |
923 // The owner field of a heavyweight monitor may be NULL for no | |
924 // owner, a JavaThread * or it may still be the address of the | |
925 // Lock word in a JavaThread's stack. A monitor can be inflated | |
926 // by a non-owning JavaThread, but only the owning JavaThread | |
927 // can change the owner field from the Lock word to the | |
928 // JavaThread * and it may not have done that yet. | |
929 owner = (address)mon->owner(); | |
930 } | |
931 } | |
932 | |
933 if (owner != NULL) { | |
934 // This monitor is owned so we have to find the owning JavaThread. | |
935 // Since owning_thread_from_monitor_owner() grabs a lock, GC can | |
936 // move our object at this point. However, our owner value is safe | |
937 // since it is either the Lock word on a stack or a JavaThread *. | |
938 owning_thread = Threads::owning_thread_from_monitor_owner(owner, !at_safepoint); | |
939 assert(owning_thread != NULL, "sanity check"); | |
940 if (owning_thread != NULL) { // robustness | |
941 // The monitor's owner either has to be the current thread, at safepoint | |
942 // or it has to be suspended. Any of these conditions will prevent both | |
943 // contending and waiting threads from modifying the state of | |
944 // the monitor. | |
945 if (!at_safepoint && !JvmtiEnv::is_thread_fully_suspended(owning_thread, true, &debug_bits)) { | |
946 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
947 } | |
948 HandleMark hm; | |
949 Handle th(owning_thread->threadObj()); | |
950 ret.owner = (jthread)jni_reference(calling_thread, th); | |
951 } | |
952 // implied else: no owner | |
953 } | |
954 | |
955 if (owning_thread != NULL) { // monitor is owned | |
956 if ((address)owning_thread == owner) { | |
957 // the owner field is the JavaThread * | |
958 assert(mon != NULL, | |
959 "must have heavyweight monitor with JavaThread * owner"); | |
960 ret.entry_count = mon->recursions() + 1; | |
961 } else { | |
962 // The owner field is the Lock word on the JavaThread's stack | |
963 // so the recursions field is not valid. We have to count the | |
964 // number of recursive monitor entries the hard way. We pass | |
965 // a handle to survive any GCs along the way. | |
966 ResourceMark rm; | |
967 ret.entry_count = count_locked_objects(owning_thread, hobj); | |
968 } | |
969 } | |
970 // implied else: entry_count == 0 | |
971 } | |
972 | |
973 int nWant,nWait; | |
974 if (mon != NULL) { | |
975 // this object has a heavyweight monitor | |
976 nWant = mon->contentions(); // # of threads contending for monitor | |
977 nWait = mon->waiters(); // # of threads in Object.wait() | |
978 ret.waiter_count = nWant + nWait; | |
979 ret.notify_waiter_count = nWait; | |
980 } else { | |
981 // this object has a lightweight monitor | |
982 ret.waiter_count = 0; | |
983 ret.notify_waiter_count = 0; | |
984 } | |
985 | |
986 // Allocate memory for heavyweight and lightweight monitor. | |
987 jvmtiError err; | |
988 err = allocate(ret.waiter_count * sizeof(jthread *), (unsigned char**)&ret.waiters); | |
989 if (err != JVMTI_ERROR_NONE) { | |
990 return err; | |
991 } | |
992 err = allocate(ret.notify_waiter_count * sizeof(jthread *), | |
993 (unsigned char**)&ret.notify_waiters); | |
994 if (err != JVMTI_ERROR_NONE) { | |
995 deallocate((unsigned char*)ret.waiters); | |
996 return err; | |
997 } | |
998 | |
999 // now derive the rest of the fields | |
1000 if (mon != NULL) { | |
1001 // this object has a heavyweight monitor | |
1002 | |
1003 // Number of waiters may actually be less than the waiter count. | |
1004 // So NULL out memory so that unused memory will be NULL. | |
1005 memset(ret.waiters, 0, ret.waiter_count * sizeof(jthread *)); | |
1006 memset(ret.notify_waiters, 0, ret.notify_waiter_count * sizeof(jthread *)); | |
1007 | |
1008 if (ret.waiter_count > 0) { | |
1009 // we have contending and/or waiting threads | |
1010 HandleMark hm; | |
1011 if (nWant > 0) { | |
1012 // we have contending threads | |
1013 ResourceMark rm; | |
1014 // get_pending_threads returns only java thread so we do not need to | |
1015 // check for non java threads. | |
1016 GrowableArray<JavaThread*>* wantList = Threads::get_pending_threads( | |
1017 nWant, (address)mon, !at_safepoint); | |
1018 if (wantList->length() < nWant) { | |
1019 // robustness: the pending list has gotten smaller | |
1020 nWant = wantList->length(); | |
1021 } | |
1022 for (int i = 0; i < nWant; i++) { | |
1023 JavaThread *pending_thread = wantList->at(i); | |
1024 // If the monitor has no owner, then a non-suspended contending | |
1025 // thread could potentially change the state of the monitor by | |
1026 // entering it. The JVM/TI spec doesn't allow this. | |
1027 if (owning_thread == NULL && !at_safepoint & | |
1028 !JvmtiEnv::is_thread_fully_suspended(pending_thread, true, &debug_bits)) { | |
1029 if (ret.owner != NULL) { | |
1030 destroy_jni_reference(calling_thread, ret.owner); | |
1031 } | |
1032 for (int j = 0; j < i; j++) { | |
1033 destroy_jni_reference(calling_thread, ret.waiters[j]); | |
1034 } | |
1035 deallocate((unsigned char*)ret.waiters); | |
1036 deallocate((unsigned char*)ret.notify_waiters); | |
1037 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
1038 } | |
1039 Handle th(pending_thread->threadObj()); | |
1040 ret.waiters[i] = (jthread)jni_reference(calling_thread, th); | |
1041 } | |
1042 } | |
1043 if (nWait > 0) { | |
1044 // we have threads in Object.wait() | |
1045 int offset = nWant; // add after any contending threads | |
1046 ObjectWaiter *waiter = mon->first_waiter(); | |
1047 for (int i = 0, j = 0; i < nWait; i++) { | |
1048 if (waiter == NULL) { | |
1049 // robustness: the waiting list has gotten smaller | |
1050 nWait = j; | |
1051 break; | |
1052 } | |
1053 Thread *t = mon->thread_of_waiter(waiter); | |
1054 if (t != NULL && t->is_Java_thread()) { | |
1055 JavaThread *wjava_thread = (JavaThread *)t; | |
1056 // If the thread was found on the ObjectWaiter list, then | |
1057 // it has not been notified. This thread can't change the | |
1058 // state of the monitor so it doesn't need to be suspended. | |
1059 Handle th(wjava_thread->threadObj()); | |
1060 ret.waiters[offset + j] = (jthread)jni_reference(calling_thread, th); | |
1061 ret.notify_waiters[j++] = (jthread)jni_reference(calling_thread, th); | |
1062 } | |
1063 waiter = mon->next_waiter(waiter); | |
1064 } | |
1065 } | |
1066 } | |
1067 | |
1068 // Adjust count. nWant and nWait count values may be less than original. | |
1069 ret.waiter_count = nWant + nWait; | |
1070 ret.notify_waiter_count = nWait; | |
1071 } else { | |
1072 // this object has a lightweight monitor and we have nothing more | |
1073 // to do here because the defaults are just fine. | |
1074 } | |
1075 | |
1076 // we don't update return parameter unless everything worked | |
1077 *info_ptr = ret; | |
1078 | |
1079 return JVMTI_ERROR_NONE; | |
1080 } | |
1081 | |
1082 ResourceTracker::ResourceTracker(JvmtiEnv* env) { | |
1083 _env = env; | |
1084 _allocations = new (ResourceObj::C_HEAP) GrowableArray<unsigned char*>(20, true); | |
1085 _failed = false; | |
1086 } | |
1087 ResourceTracker::~ResourceTracker() { | |
1088 if (_failed) { | |
1089 for (int i=0; i<_allocations->length(); i++) { | |
1090 _env->deallocate(_allocations->at(i)); | |
1091 } | |
1092 } | |
1093 delete _allocations; | |
1094 } | |
1095 | |
1096 jvmtiError ResourceTracker::allocate(jlong size, unsigned char** mem_ptr) { | |
1097 unsigned char *ptr; | |
1098 jvmtiError err = _env->allocate(size, &ptr); | |
1099 if (err == JVMTI_ERROR_NONE) { | |
1100 _allocations->append(ptr); | |
1101 *mem_ptr = ptr; | |
1102 } else { | |
1103 *mem_ptr = NULL; | |
1104 _failed = true; | |
1105 } | |
1106 return err; | |
1107 } | |
1108 | |
1109 unsigned char* ResourceTracker::allocate(jlong size) { | |
1110 unsigned char* ptr; | |
1111 allocate(size, &ptr); | |
1112 return ptr; | |
1113 } | |
1114 | |
1115 char* ResourceTracker::strdup(const char* str) { | |
1116 char *dup_str = (char*)allocate(strlen(str)+1); | |
1117 if (dup_str != NULL) { | |
1118 strcpy(dup_str, str); | |
1119 } | |
1120 return dup_str; | |
1121 } | |
1122 | |
1123 struct StackInfoNode { | |
1124 struct StackInfoNode *next; | |
1125 jvmtiStackInfo info; | |
1126 }; | |
1127 | |
1128 // Create a jvmtiStackInfo inside a linked list node and create a | |
1129 // buffer for the frame information, both allocated as resource objects. | |
1130 // Fill in both the jvmtiStackInfo and the jvmtiFrameInfo. | |
1131 // Note that either or both of thr and thread_oop | |
1132 // may be null if the thread is new or has exited. | |
1133 void | |
1134 VM_GetMultipleStackTraces::fill_frames(jthread jt, JavaThread *thr, oop thread_oop) { | |
1135 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1136 | |
1137 jint state = 0; | |
1138 struct StackInfoNode *node = NEW_RESOURCE_OBJ(struct StackInfoNode); | |
1139 jvmtiStackInfo *infop = &(node->info); | |
1140 node->next = head(); | |
1141 set_head(node); | |
1142 infop->frame_count = 0; | |
1143 infop->thread = jt; | |
1144 | |
1145 if (thread_oop != NULL) { | |
1146 // get most state bits | |
1147 state = (jint)java_lang_Thread::get_thread_status(thread_oop); | |
1148 } | |
1149 | |
1150 if (thr != NULL) { // add more state bits if there is a JavaThead to query | |
1151 // same as is_being_ext_suspended() but without locking | |
1152 if (thr->is_ext_suspended() || thr->is_external_suspend()) { | |
1153 state |= JVMTI_THREAD_STATE_SUSPENDED; | |
1154 } | |
1155 JavaThreadState jts = thr->thread_state(); | |
1156 if (jts == _thread_in_native) { | |
1157 state |= JVMTI_THREAD_STATE_IN_NATIVE; | |
1158 } | |
1159 OSThread* osThread = thr->osthread(); | |
1160 if (osThread != NULL && osThread->interrupted()) { | |
1161 state |= JVMTI_THREAD_STATE_INTERRUPTED; | |
1162 } | |
1163 } | |
1164 infop->state = state; | |
1165 | |
1166 if (thr != NULL || (state & JVMTI_THREAD_STATE_ALIVE) != 0) { | |
1167 infop->frame_buffer = NEW_RESOURCE_ARRAY(jvmtiFrameInfo, max_frame_count()); | |
1168 env()->get_stack_trace(thr, 0, max_frame_count(), | |
1169 infop->frame_buffer, &(infop->frame_count)); | |
1170 } else { | |
1171 infop->frame_buffer = NULL; | |
1172 infop->frame_count = 0; | |
1173 } | |
1174 _frame_count_total += infop->frame_count; | |
1175 } | |
1176 | |
1177 // Based on the stack information in the linked list, allocate memory | |
1178 // block to return and fill it from the info in the linked list. | |
1179 void | |
1180 VM_GetMultipleStackTraces::allocate_and_fill_stacks(jint thread_count) { | |
1181 // do I need to worry about alignment issues? | |
1182 jlong alloc_size = thread_count * sizeof(jvmtiStackInfo) | |
1183 + _frame_count_total * sizeof(jvmtiFrameInfo); | |
1184 env()->allocate(alloc_size, (unsigned char **)&_stack_info); | |
1185 | |
1186 // pointers to move through the newly allocated space as it is filled in | |
1187 jvmtiStackInfo *si = _stack_info + thread_count; // bottom of stack info | |
1188 jvmtiFrameInfo *fi = (jvmtiFrameInfo *)si; // is the top of frame info | |
1189 | |
1190 // copy information in resource area into allocated buffer | |
1191 // insert stack info backwards since linked list is backwards | |
1192 // insert frame info forwards | |
1193 // walk the StackInfoNodes | |
1194 for (struct StackInfoNode *sin = head(); sin != NULL; sin = sin->next) { | |
1195 jint frame_count = sin->info.frame_count; | |
1196 size_t frames_size = frame_count * sizeof(jvmtiFrameInfo); | |
1197 --si; | |
1198 memcpy(si, &(sin->info), sizeof(jvmtiStackInfo)); | |
1199 if (frames_size == 0) { | |
1200 si->frame_buffer = NULL; | |
1201 } else { | |
1202 memcpy(fi, sin->info.frame_buffer, frames_size); | |
1203 si->frame_buffer = fi; // point to the new allocated copy of the frames | |
1204 fi += frame_count; | |
1205 } | |
1206 } | |
1207 assert(si == _stack_info, "the last copied stack info must be the first record"); | |
1208 assert((unsigned char *)fi == ((unsigned char *)_stack_info) + alloc_size, | |
1209 "the last copied frame info must be the last record"); | |
1210 } | |
1211 | |
1212 | |
1213 void | |
1214 VM_GetThreadListStackTraces::doit() { | |
1215 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1216 | |
1217 ResourceMark rm; | |
1218 for (int i = 0; i < _thread_count; ++i) { | |
1219 jthread jt = _thread_list[i]; | |
1220 oop thread_oop = JNIHandles::resolve_external_guard(jt); | |
1221 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::thread_klass())) { | |
1222 set_result(JVMTI_ERROR_INVALID_THREAD); | |
1223 return; | |
1224 } | |
1225 fill_frames(jt, java_lang_Thread::thread(thread_oop), thread_oop); | |
1226 } | |
1227 allocate_and_fill_stacks(_thread_count); | |
1228 } | |
1229 | |
1230 void | |
1231 VM_GetAllStackTraces::doit() { | |
1232 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1233 | |
1234 ResourceMark rm; | |
1235 _final_thread_count = 0; | |
1236 for (JavaThread *jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
1237 oop thread_oop = jt->threadObj(); | |
1238 if (thread_oop != NULL && | |
1239 !jt->is_exiting() && | |
1240 java_lang_Thread::is_alive(thread_oop) && | |
1241 !jt->is_hidden_from_external_view()) { | |
1242 ++_final_thread_count; | |
1243 // Handle block of the calling thread is used to create local refs. | |
1244 fill_frames((jthread)JNIHandles::make_local(_calling_thread, thread_oop), | |
1245 jt, thread_oop); | |
1246 } | |
1247 } | |
1248 allocate_and_fill_stacks(_final_thread_count); | |
1249 } | |
1250 | |
1251 // Verifies that the top frame is a java frame in an expected state. | |
1252 // Deoptimizes frame if needed. | |
1253 // Checks that the frame method signature matches the return type (tos). | |
1254 // HandleMark must be defined in the caller only. | |
1255 // It is to keep a ret_ob_h handle alive after return to the caller. | |
1256 jvmtiError | |
1257 JvmtiEnvBase::check_top_frame(JavaThread* current_thread, JavaThread* java_thread, | |
1258 jvalue value, TosState tos, Handle* ret_ob_h) { | |
1259 ResourceMark rm(current_thread); | |
1260 | |
1261 vframe *vf = vframeFor(java_thread, 0); | |
1262 NULL_CHECK(vf, JVMTI_ERROR_NO_MORE_FRAMES); | |
1263 | |
1264 javaVFrame *jvf = (javaVFrame*) vf; | |
1265 if (!vf->is_java_frame() || jvf->method()->is_native()) { | |
1266 return JVMTI_ERROR_OPAQUE_FRAME; | |
1267 } | |
1268 | |
1269 // If the frame is a compiled one, need to deoptimize it. | |
1270 if (vf->is_compiled_frame()) { | |
1271 if (!vf->fr().can_be_deoptimized()) { | |
1272 return JVMTI_ERROR_OPAQUE_FRAME; | |
1273 } | |
1274 VM_DeoptimizeFrame deopt(java_thread, jvf->fr().id()); | |
1275 VMThread::execute(&deopt); | |
1276 } | |
1277 | |
1278 // Get information about method return type | |
1279 symbolHandle signature(current_thread, jvf->method()->signature()); | |
1280 | |
1281 ResultTypeFinder rtf(signature); | |
1282 TosState fr_tos = as_TosState(rtf.type()); | |
1283 if (fr_tos != tos) { | |
1284 if (tos != itos || (fr_tos != btos && fr_tos != ctos && fr_tos != stos)) { | |
1285 return JVMTI_ERROR_TYPE_MISMATCH; | |
1286 } | |
1287 } | |
1288 | |
1289 // Check that the jobject class matches the return type signature. | |
1290 jobject jobj = value.l; | |
1291 if (tos == atos && jobj != NULL) { // NULL reference is allowed | |
1292 Handle ob_h = Handle(current_thread, JNIHandles::resolve_external_guard(jobj)); | |
1293 NULL_CHECK(ob_h, JVMTI_ERROR_INVALID_OBJECT); | |
1294 KlassHandle ob_kh = KlassHandle(current_thread, ob_h()->klass()); | |
1295 NULL_CHECK(ob_kh, JVMTI_ERROR_INVALID_OBJECT); | |
1296 | |
1297 // Method return type signature. | |
1298 char* ty_sign = 1 + strchr(signature->as_C_string(), ')'); | |
1299 | |
1300 if (!VM_GetOrSetLocal::is_assignable(ty_sign, Klass::cast(ob_kh()), current_thread)) { | |
1301 return JVMTI_ERROR_TYPE_MISMATCH; | |
1302 } | |
1303 *ret_ob_h = ob_h; | |
1304 } | |
1305 return JVMTI_ERROR_NONE; | |
1306 } /* end check_top_frame */ | |
1307 | |
1308 | |
1309 // ForceEarlyReturn<type> follows the PopFrame approach in many aspects. | |
1310 // Main difference is on the last stage in the interpreter. | |
1311 // The PopFrame stops method execution to continue execution | |
1312 // from the same method call instruction. | |
1313 // The ForceEarlyReturn forces return from method so the execution | |
1314 // continues at the bytecode following the method call. | |
1315 | |
1316 // Threads_lock NOT held, java_thread not protected by lock | |
1317 // java_thread - pre-checked | |
1318 | |
1319 jvmtiError | |
1320 JvmtiEnvBase::force_early_return(JavaThread* java_thread, jvalue value, TosState tos) { | |
1321 JavaThread* current_thread = JavaThread::current(); | |
1322 HandleMark hm(current_thread); | |
1323 uint32_t debug_bits = 0; | |
1324 | |
1325 // Check if java_thread is fully suspended | |
1326 if (!is_thread_fully_suspended(java_thread, | |
1327 true /* wait for suspend completion */, | |
1328 &debug_bits)) { | |
1329 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
1330 } | |
1331 | |
1332 // retreive or create the state | |
1333 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); | |
1334 | |
1335 // Check to see if a ForceEarlyReturn was already in progress | |
1336 if (state->is_earlyret_pending()) { | |
1337 // Probably possible for JVMTI clients to trigger this, but the | |
1338 // JPDA backend shouldn't allow this to happen | |
1339 return JVMTI_ERROR_INTERNAL; | |
1340 } | |
1341 { | |
1342 // The same as for PopFrame. Workaround bug: | |
1343 // 4812902: popFrame hangs if the method is waiting at a synchronize | |
1344 // Catch this condition and return an error to avoid hanging. | |
1345 // Now JVMTI spec allows an implementation to bail out with an opaque | |
1346 // frame error. | |
1347 OSThread* osThread = java_thread->osthread(); | |
1348 if (osThread->get_state() == MONITOR_WAIT) { | |
1349 return JVMTI_ERROR_OPAQUE_FRAME; | |
1350 } | |
1351 } | |
1352 Handle ret_ob_h = Handle(); | |
1353 jvmtiError err = check_top_frame(current_thread, java_thread, value, tos, &ret_ob_h); | |
1354 if (err != JVMTI_ERROR_NONE) { | |
1355 return err; | |
1356 } | |
1357 assert(tos != atos || value.l == NULL || ret_ob_h() != NULL, | |
1358 "return object oop must not be NULL if jobject is not NULL"); | |
1359 | |
1360 // Update the thread state to reflect that the top frame must be | |
1361 // forced to return. | |
1362 // The current frame will be returned later when the suspended | |
1363 // thread is resumed and right before returning from VM to Java. | |
1364 // (see call_VM_base() in assembler_<cpu>.cpp). | |
1365 | |
1366 state->set_earlyret_pending(); | |
1367 state->set_earlyret_oop(ret_ob_h()); | |
1368 state->set_earlyret_value(value, tos); | |
1369 | |
1370 // Set pending step flag for this early return. | |
1371 // It is cleared when next step event is posted. | |
1372 state->set_pending_step_for_earlyret(); | |
1373 | |
1374 return JVMTI_ERROR_NONE; | |
1375 } /* end force_early_return */ | |
1376 | |
1377 void | |
1378 JvmtiMonitorClosure::do_monitor(ObjectMonitor* mon) { | |
1379 if ( _error != JVMTI_ERROR_NONE) { | |
1380 // Error occurred in previous iteration so no need to add | |
1381 // to the list. | |
1382 return; | |
1383 } | |
1384 if (mon->owner() == _java_thread ) { | |
1385 // Filter out on stack monitors collected during stack walk. | |
1386 oop obj = (oop)mon->object(); | |
1387 bool found = false; | |
1388 for (int j = 0; j < _owned_monitors_list->length(); j++) { | |
1389 jobject jobj = ((jvmtiMonitorStackDepthInfo*)_owned_monitors_list->at(j))->monitor; | |
1390 oop check = JNIHandles::resolve(jobj); | |
1391 if (check == obj) { | |
1392 // On stack monitor already collected during the stack walk. | |
1393 found = true; | |
1394 break; | |
1395 } | |
1396 } | |
1397 if (found == false) { | |
1398 // This is off stack monitor (e.g. acquired via jni MonitorEnter). | |
1399 jvmtiError err; | |
1400 jvmtiMonitorStackDepthInfo *jmsdi; | |
1401 err = _env->allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); | |
1402 if (err != JVMTI_ERROR_NONE) { | |
1403 _error = err; | |
1404 return; | |
1405 } | |
1406 Handle hobj(obj); | |
1407 jmsdi->monitor = _env->jni_reference(_calling_thread, hobj); | |
1408 // stack depth is unknown for this monitor. | |
1409 jmsdi->stack_depth = -1; | |
1410 _owned_monitors_list->append(jmsdi); | |
1411 } | |
1412 } | |
1413 } | |
1414 | |
1415 #endif // !JVMTI_KERNEL |