Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiEnvBase.cpp @ 948:89e0543e1737
6884624: Update copyright year
Summary: Update copyright for files that have been modified in 2009 through Septermber
Reviewed-by: tbell, ohair
author | xdono |
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date | Tue, 22 Sep 2009 14:06:10 -0700 |
parents | bd02caa94611 |
children | dcb15a6f342d 4ce7240d622c |
rev | line source |
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0 | 1 /* |
844 | 2 * Copyright 2003-2009 Sun Microsystems, Inc. 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 * | |
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 | |
611
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97 bool |
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98 JvmtiEnvBase::is_valid() { |
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99 jint value = 0; |
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100 |
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101 // This object might not be a JvmtiEnvBase so we can't assume |
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102 // the _magic field is properly aligned. Get the value in a safe |
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103 // way and then check against JVMTI_MAGIC. |
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104 |
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105 switch (sizeof(_magic)) { |
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106 case 2: |
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107 value = Bytes::get_native_u2((address)&_magic); |
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108 break; |
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109 |
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110 case 4: |
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111 value = Bytes::get_native_u4((address)&_magic); |
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112 break; |
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113 |
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114 case 8: |
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115 value = Bytes::get_native_u8((address)&_magic); |
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116 break; |
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117 |
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118 default: |
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119 guarantee(false, "_magic field is an unexpected size"); |
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120 } |
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121 |
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122 return value == JVMTI_MAGIC; |
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123 } |
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124 |
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125 |
0 | 126 JvmtiEnvBase::JvmtiEnvBase() : _env_event_enable() { |
127 _env_local_storage = NULL; | |
128 _tag_map = NULL; | |
129 _native_method_prefix_count = 0; | |
130 _native_method_prefixes = NULL; | |
131 _next = NULL; | |
132 _class_file_load_hook_ever_enabled = false; | |
133 | |
134 // Moot since ClassFileLoadHook not yet enabled. | |
135 // But "true" will give a more predictable ClassFileLoadHook behavior | |
136 // for environment creation during ClassFileLoadHook. | |
137 _is_retransformable = true; | |
138 | |
139 // all callbacks initially NULL | |
140 memset(&_event_callbacks,0,sizeof(jvmtiEventCallbacks)); | |
141 | |
142 // all capabilities initially off | |
143 memset(&_current_capabilities, 0, sizeof(_current_capabilities)); | |
144 | |
145 // all prohibited capabilities initially off | |
146 memset(&_prohibited_capabilities, 0, sizeof(_prohibited_capabilities)); | |
147 | |
148 _magic = JVMTI_MAGIC; | |
149 | |
150 JvmtiEventController::env_initialize((JvmtiEnv*)this); | |
151 | |
152 #ifdef JVMTI_TRACE | |
371 | 153 _jvmti_external.functions = TraceJVMTI != NULL ? &jvmtiTrace_Interface : &jvmti_Interface; |
0 | 154 #else |
155 _jvmti_external.functions = &jvmti_Interface; | |
156 #endif | |
157 } | |
158 | |
159 | |
160 void | |
161 JvmtiEnvBase::dispose() { | |
162 | |
163 #ifdef JVMTI_TRACE | |
164 JvmtiTrace::shutdown(); | |
165 #endif | |
166 | |
167 // Dispose of event info and let the event controller call us back | |
168 // in a locked state (env_dispose, below) | |
169 JvmtiEventController::env_dispose(this); | |
170 } | |
171 | |
172 void | |
173 JvmtiEnvBase::env_dispose() { | |
174 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
175 | |
176 // We have been entered with all events disabled on this environment. | |
177 // A race to re-enable events (by setting callbacks) is prevented by | |
178 // checking for a valid environment when setting callbacks (while | |
179 // holding the JvmtiThreadState_lock). | |
180 | |
181 // Mark as invalid. | |
182 _magic = DISPOSED_MAGIC; | |
183 | |
184 // Relinquish all capabilities. | |
185 jvmtiCapabilities *caps = get_capabilities(); | |
186 JvmtiManageCapabilities::relinquish_capabilities(caps, caps, caps); | |
187 | |
188 // Same situation as with events (see above) | |
189 set_native_method_prefixes(0, NULL); | |
190 | |
191 #ifndef JVMTI_KERNEL | |
192 JvmtiTagMap* tag_map_to_deallocate = _tag_map; | |
193 set_tag_map(NULL); | |
194 // A tag map can be big, deallocate it now | |
195 if (tag_map_to_deallocate != NULL) { | |
196 delete tag_map_to_deallocate; | |
197 } | |
198 #endif // !JVMTI_KERNEL | |
199 | |
200 _needs_clean_up = true; | |
201 } | |
202 | |
203 | |
204 JvmtiEnvBase::~JvmtiEnvBase() { | |
205 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
206 | |
207 // There is a small window of time during which the tag map of a | |
208 // disposed environment could have been reallocated. | |
209 // Make sure it is gone. | |
210 #ifndef JVMTI_KERNEL | |
211 JvmtiTagMap* tag_map_to_deallocate = _tag_map; | |
212 set_tag_map(NULL); | |
213 // A tag map can be big, deallocate it now | |
214 if (tag_map_to_deallocate != NULL) { | |
215 delete tag_map_to_deallocate; | |
216 } | |
217 #endif // !JVMTI_KERNEL | |
218 | |
219 _magic = BAD_MAGIC; | |
220 } | |
221 | |
222 | |
223 void | |
224 JvmtiEnvBase::periodic_clean_up() { | |
225 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
226 | |
227 // JvmtiEnvBase reference is saved in JvmtiEnvThreadState. So | |
228 // clean up JvmtiThreadState before deleting JvmtiEnv pointer. | |
229 JvmtiThreadState::periodic_clean_up(); | |
230 | |
231 // Unlink all invalid environments from the list of environments | |
232 // and deallocate them | |
233 JvmtiEnvIterator it; | |
234 JvmtiEnvBase* previous_env = NULL; | |
235 JvmtiEnvBase* env = it.first(); | |
236 while (env != NULL) { | |
237 if (env->is_valid()) { | |
238 previous_env = env; | |
239 env = it.next(env); | |
240 } else { | |
241 // This one isn't valid, remove it from the list and deallocate it | |
242 JvmtiEnvBase* defunct_env = env; | |
243 env = it.next(env); | |
244 if (previous_env == NULL) { | |
245 _head_environment = env; | |
246 } else { | |
247 previous_env->set_next_environment(env); | |
248 } | |
249 delete defunct_env; | |
250 } | |
251 } | |
252 | |
253 } | |
254 | |
255 | |
256 void | |
257 JvmtiEnvBase::check_for_periodic_clean_up() { | |
258 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
259 | |
260 class ThreadInsideIterationClosure: public ThreadClosure { | |
261 private: | |
262 bool _inside; | |
263 public: | |
264 ThreadInsideIterationClosure() : _inside(false) {}; | |
265 | |
266 void do_thread(Thread* thread) { | |
267 _inside |= thread->is_inside_jvmti_env_iteration(); | |
268 } | |
269 | |
270 bool is_inside_jvmti_env_iteration() { | |
271 return _inside; | |
272 } | |
273 }; | |
274 | |
275 if (_needs_clean_up) { | |
276 // Check if we are currently iterating environment, | |
277 // deallocation should not occur if we are | |
278 ThreadInsideIterationClosure tiic; | |
279 Threads::threads_do(&tiic); | |
280 if (!tiic.is_inside_jvmti_env_iteration() && | |
281 !is_inside_dying_thread_env_iteration()) { | |
282 _needs_clean_up = false; | |
283 JvmtiEnvBase::periodic_clean_up(); | |
284 } | |
285 } | |
286 } | |
287 | |
288 | |
289 void | |
290 JvmtiEnvBase::record_first_time_class_file_load_hook_enabled() { | |
291 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), | |
292 "sanity check"); | |
293 | |
294 if (!_class_file_load_hook_ever_enabled) { | |
295 _class_file_load_hook_ever_enabled = true; | |
296 | |
297 if (get_capabilities()->can_retransform_classes) { | |
298 _is_retransformable = true; | |
299 } else { | |
300 _is_retransformable = false; | |
301 | |
302 // cannot add retransform capability after ClassFileLoadHook has been enabled | |
303 get_prohibited_capabilities()->can_retransform_classes = 1; | |
304 } | |
305 } | |
306 } | |
307 | |
308 | |
309 void | |
310 JvmtiEnvBase::record_class_file_load_hook_enabled() { | |
311 if (!_class_file_load_hook_ever_enabled) { | |
312 if (Threads::number_of_threads() == 0) { | |
313 record_first_time_class_file_load_hook_enabled(); | |
314 } else { | |
315 MutexLocker mu(JvmtiThreadState_lock); | |
316 record_first_time_class_file_load_hook_enabled(); | |
317 } | |
318 } | |
319 } | |
320 | |
321 | |
322 jvmtiError | |
323 JvmtiEnvBase::set_native_method_prefixes(jint prefix_count, char** prefixes) { | |
324 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), | |
325 "sanity check"); | |
326 | |
327 int old_prefix_count = get_native_method_prefix_count(); | |
328 char **old_prefixes = get_native_method_prefixes(); | |
329 | |
330 // allocate and install the new prefixex | |
331 if (prefix_count == 0 || !is_valid()) { | |
332 _native_method_prefix_count = 0; | |
333 _native_method_prefixes = NULL; | |
334 } else { | |
335 // there are prefixes, allocate an array to hold them, and fill it | |
336 char** new_prefixes = (char**)os::malloc((prefix_count) * sizeof(char*)); | |
337 if (new_prefixes == NULL) { | |
338 return JVMTI_ERROR_OUT_OF_MEMORY; | |
339 } | |
340 for (int i = 0; i < prefix_count; i++) { | |
341 char* prefix = prefixes[i]; | |
342 if (prefix == NULL) { | |
343 for (int j = 0; j < (i-1); j++) { | |
344 os::free(new_prefixes[j]); | |
345 } | |
346 os::free(new_prefixes); | |
347 return JVMTI_ERROR_NULL_POINTER; | |
348 } | |
349 prefix = os::strdup(prefixes[i]); | |
350 if (prefix == NULL) { | |
351 for (int j = 0; j < (i-1); j++) { | |
352 os::free(new_prefixes[j]); | |
353 } | |
354 os::free(new_prefixes); | |
355 return JVMTI_ERROR_OUT_OF_MEMORY; | |
356 } | |
357 new_prefixes[i] = prefix; | |
358 } | |
359 _native_method_prefix_count = prefix_count; | |
360 _native_method_prefixes = new_prefixes; | |
361 } | |
362 | |
363 // now that we know the new prefixes have been successfully installed we can | |
364 // safely remove the old ones | |
365 if (old_prefix_count != 0) { | |
366 for (int i = 0; i < old_prefix_count; i++) { | |
367 os::free(old_prefixes[i]); | |
368 } | |
369 os::free(old_prefixes); | |
370 } | |
371 | |
372 return JVMTI_ERROR_NONE; | |
373 } | |
374 | |
375 | |
376 // Collect all the prefixes which have been set in any JVM TI environments | |
377 // by the SetNativeMethodPrefix(es) functions. Be sure to maintain the | |
378 // order of environments and the order of prefixes within each environment. | |
379 // Return in a resource allocated array. | |
380 char** | |
381 JvmtiEnvBase::get_all_native_method_prefixes(int* count_ptr) { | |
382 assert(Threads::number_of_threads() == 0 || | |
383 SafepointSynchronize::is_at_safepoint() || | |
384 JvmtiThreadState_lock->is_locked(), | |
385 "sanity check"); | |
386 | |
387 int total_count = 0; | |
388 GrowableArray<char*>* prefix_array =new GrowableArray<char*>(5); | |
389 | |
390 JvmtiEnvIterator it; | |
391 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
392 int prefix_count = env->get_native_method_prefix_count(); | |
393 char** prefixes = env->get_native_method_prefixes(); | |
394 for (int j = 0; j < prefix_count; j++) { | |
395 // retrieve a prefix and so that it is safe against asynchronous changes | |
396 // copy it into the resource area | |
397 char* prefix = prefixes[j]; | |
398 char* prefix_copy = NEW_RESOURCE_ARRAY(char, strlen(prefix)+1); | |
399 strcpy(prefix_copy, prefix); | |
400 prefix_array->at_put_grow(total_count++, prefix_copy); | |
401 } | |
402 } | |
403 | |
404 char** all_prefixes = NEW_RESOURCE_ARRAY(char*, total_count); | |
405 char** p = all_prefixes; | |
406 for (int i = 0; i < total_count; ++i) { | |
407 *p++ = prefix_array->at(i); | |
408 } | |
409 *count_ptr = total_count; | |
410 return all_prefixes; | |
411 } | |
412 | |
413 void | |
414 JvmtiEnvBase::set_event_callbacks(const jvmtiEventCallbacks* callbacks, | |
415 jint size_of_callbacks) { | |
416 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
417 | |
418 size_t byte_cnt = sizeof(jvmtiEventCallbacks); | |
419 | |
420 // clear in either case to be sure we got any gap between sizes | |
421 memset(&_event_callbacks, 0, byte_cnt); | |
422 | |
423 // Now that JvmtiThreadState_lock is held, prevent a possible race condition where events | |
424 // are re-enabled by a call to set event callbacks where the DisposeEnvironment | |
425 // occurs after the boiler-plate environment check and before the lock is acquired. | |
426 if (callbacks != NULL && is_valid()) { | |
427 if (size_of_callbacks < (jint)byte_cnt) { | |
428 byte_cnt = size_of_callbacks; | |
429 } | |
430 memcpy(&_event_callbacks, callbacks, byte_cnt); | |
431 } | |
432 } | |
433 | |
434 // Called from JVMTI entry points which perform stack walking. If the | |
435 // associated JavaThread is the current thread, then wait_for_suspend | |
436 // is not used. Otherwise, it determines if we should wait for the | |
437 // "other" thread to complete external suspension. (NOTE: in future | |
438 // releases the suspension mechanism should be reimplemented so this | |
439 // is not necessary.) | |
440 // | |
441 bool | |
442 JvmtiEnvBase::is_thread_fully_suspended(JavaThread* thr, bool wait_for_suspend, uint32_t *bits) { | |
443 // "other" threads require special handling | |
444 if (thr != JavaThread::current()) { | |
445 if (wait_for_suspend) { | |
446 // We are allowed to wait for the external suspend to complete | |
447 // so give the other thread a chance to get suspended. | |
448 if (!thr->wait_for_ext_suspend_completion(SuspendRetryCount, | |
449 SuspendRetryDelay, bits)) { | |
450 // didn't make it so let the caller know | |
451 return false; | |
452 } | |
453 } | |
454 // We aren't allowed to wait for the external suspend to complete | |
455 // so if the other thread isn't externally suspended we need to | |
456 // let the caller know. | |
457 else if (!thr->is_ext_suspend_completed_with_lock(bits)) { | |
458 return false; | |
459 } | |
460 } | |
461 | |
462 return true; | |
463 } | |
464 | |
465 | |
466 // In the fullness of time, all users of the method should instead | |
467 // directly use allocate, besides being cleaner and faster, this will | |
468 // mean much better out of memory handling | |
469 unsigned char * | |
470 JvmtiEnvBase::jvmtiMalloc(jlong size) { | |
471 unsigned char* mem; | |
472 jvmtiError result = allocate(size, &mem); | |
473 assert(result == JVMTI_ERROR_NONE, "Allocate failed"); | |
474 return mem; | |
475 } | |
476 | |
477 | |
478 // | |
479 // Threads | |
480 // | |
481 | |
482 jobject * | |
483 JvmtiEnvBase::new_jobjectArray(int length, Handle *handles) { | |
484 if (length == 0) { | |
485 return NULL; | |
486 } | |
487 | |
488 jobject *objArray = (jobject *) jvmtiMalloc(sizeof(jobject) * length); | |
489 NULL_CHECK(objArray, NULL); | |
490 | |
491 for (int i=0; i<length; i++) { | |
492 objArray[i] = jni_reference(handles[i]); | |
493 } | |
494 return objArray; | |
495 } | |
496 | |
497 jthread * | |
498 JvmtiEnvBase::new_jthreadArray(int length, Handle *handles) { | |
499 return (jthread *) new_jobjectArray(length,handles); | |
500 } | |
501 | |
502 jthreadGroup * | |
503 JvmtiEnvBase::new_jthreadGroupArray(int length, Handle *handles) { | |
504 return (jthreadGroup *) new_jobjectArray(length,handles); | |
505 } | |
506 | |
507 | |
508 JavaThread * | |
509 JvmtiEnvBase::get_JavaThread(jthread jni_thread) { | |
510 oop t = JNIHandles::resolve_external_guard(jni_thread); | |
511 if (t == NULL || !t->is_a(SystemDictionary::thread_klass())) { | |
512 return NULL; | |
513 } | |
514 // The following returns NULL if the thread has not yet run or is in | |
515 // process of exiting | |
516 return java_lang_Thread::thread(t); | |
517 } | |
518 | |
519 | |
520 // update the access_flags for the field in the klass | |
521 void | |
522 JvmtiEnvBase::update_klass_field_access_flag(fieldDescriptor *fd) { | |
523 instanceKlass* ik = instanceKlass::cast(fd->field_holder()); | |
524 typeArrayOop fields = ik->fields(); | |
525 fields->ushort_at_put(fd->index(), (jushort)fd->access_flags().as_short()); | |
526 } | |
527 | |
528 | |
529 // return the vframe on the specified thread and depth, NULL if no such frame | |
530 vframe* | |
531 JvmtiEnvBase::vframeFor(JavaThread* java_thread, jint depth) { | |
532 if (!java_thread->has_last_Java_frame()) { | |
533 return NULL; | |
534 } | |
535 RegisterMap reg_map(java_thread); | |
536 vframe *vf = java_thread->last_java_vframe(®_map); | |
537 int d = 0; | |
538 while ((vf != NULL) && (d < depth)) { | |
539 vf = vf->java_sender(); | |
540 d++; | |
541 } | |
542 return vf; | |
543 } | |
544 | |
545 | |
546 // | |
547 // utilities: JNI objects | |
548 // | |
549 | |
550 | |
551 jclass | |
552 JvmtiEnvBase::get_jni_class_non_null(klassOop k) { | |
553 assert(k != NULL, "k != NULL"); | |
554 return (jclass)jni_reference(Klass::cast(k)->java_mirror()); | |
555 } | |
556 | |
557 #ifndef JVMTI_KERNEL | |
558 | |
559 // | |
560 // Field Information | |
561 // | |
562 | |
563 bool | |
564 JvmtiEnvBase::get_field_descriptor(klassOop k, jfieldID field, fieldDescriptor* fd) { | |
565 if (!jfieldIDWorkaround::is_valid_jfieldID(k, field)) { | |
566 return false; | |
567 } | |
568 bool found = false; | |
569 if (jfieldIDWorkaround::is_static_jfieldID(field)) { | |
570 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(field); | |
571 int offset = id->offset(); | |
572 klassOop holder = id->holder(); | |
573 found = instanceKlass::cast(holder)->find_local_field_from_offset(offset, true, fd); | |
574 } else { | |
575 // Non-static field. The fieldID is really the offset of the field within the object. | |
576 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, field); | |
577 found = instanceKlass::cast(k)->find_field_from_offset(offset, false, fd); | |
578 } | |
579 return found; | |
580 } | |
581 | |
582 // | |
583 // Object Monitor Information | |
584 // | |
585 | |
586 // | |
587 // Count the number of objects for a lightweight monitor. The hobj | |
588 // parameter is object that owns the monitor so this routine will | |
589 // count the number of times the same object was locked by frames | |
590 // in java_thread. | |
591 // | |
592 jint | |
593 JvmtiEnvBase::count_locked_objects(JavaThread *java_thread, Handle hobj) { | |
594 jint ret = 0; | |
595 if (!java_thread->has_last_Java_frame()) { | |
596 return ret; // no Java frames so no monitors | |
597 } | |
598 | |
599 ResourceMark rm; | |
600 HandleMark hm; | |
601 RegisterMap reg_map(java_thread); | |
602 | |
603 for(javaVFrame *jvf=java_thread->last_java_vframe(®_map); jvf != NULL; | |
604 jvf = jvf->java_sender()) { | |
605 GrowableArray<MonitorInfo*>* mons = jvf->monitors(); | |
606 if (!mons->is_empty()) { | |
607 for (int i = 0; i < mons->length(); i++) { | |
608 MonitorInfo *mi = mons->at(i); | |
818
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609 if (mi->owner_is_scalar_replaced()) continue; |
0 | 610 |
611 // see if owner of the monitor is our object | |
612 if (mi->owner() != NULL && mi->owner() == hobj()) { | |
613 ret++; | |
614 } | |
615 } | |
616 } | |
617 } | |
618 return ret; | |
619 } | |
620 | |
621 | |
622 | |
623 jvmtiError | |
624 JvmtiEnvBase::get_current_contended_monitor(JavaThread *calling_thread, JavaThread *java_thread, jobject *monitor_ptr) { | |
625 #ifdef ASSERT | |
626 uint32_t debug_bits = 0; | |
627 #endif | |
628 assert((SafepointSynchronize::is_at_safepoint() || | |
629 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
630 "at safepoint or target thread is suspended"); | |
631 oop obj = NULL; | |
632 ObjectMonitor *mon = java_thread->current_waiting_monitor(); | |
633 if (mon == NULL) { | |
634 // thread is not doing an Object.wait() call | |
635 mon = java_thread->current_pending_monitor(); | |
636 if (mon != NULL) { | |
637 // The thread is trying to enter() or raw_enter() an ObjectMonitor. | |
638 obj = (oop)mon->object(); | |
639 // If obj == NULL, then ObjectMonitor is raw which doesn't count | |
640 // as contended for this API | |
641 } | |
642 // implied else: no contended ObjectMonitor | |
643 } else { | |
644 // thread is doing an Object.wait() call | |
645 obj = (oop)mon->object(); | |
646 assert(obj != NULL, "Object.wait() should have an object"); | |
647 } | |
648 | |
649 if (obj == NULL) { | |
650 *monitor_ptr = NULL; | |
651 } else { | |
652 HandleMark hm; | |
653 Handle hobj(obj); | |
654 *monitor_ptr = jni_reference(calling_thread, hobj); | |
655 } | |
656 return JVMTI_ERROR_NONE; | |
657 } | |
658 | |
659 | |
660 jvmtiError | |
661 JvmtiEnvBase::get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread, | |
662 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list) { | |
663 jvmtiError err = JVMTI_ERROR_NONE; | |
664 #ifdef ASSERT | |
665 uint32_t debug_bits = 0; | |
666 #endif | |
667 assert((SafepointSynchronize::is_at_safepoint() || | |
668 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
669 "at safepoint or target thread is suspended"); | |
670 | |
671 if (java_thread->has_last_Java_frame()) { | |
672 ResourceMark rm; | |
673 HandleMark hm; | |
674 RegisterMap reg_map(java_thread); | |
675 | |
676 int depth = 0; | |
677 for (javaVFrame *jvf = java_thread->last_java_vframe(®_map); jvf != NULL; | |
678 jvf = jvf->java_sender()) { | |
679 if (depth++ < MaxJavaStackTraceDepth) { // check for stack too deep | |
680 // add locked objects for this frame into list | |
681 err = get_locked_objects_in_frame(calling_thread, java_thread, jvf, owned_monitors_list, depth-1); | |
682 if (err != JVMTI_ERROR_NONE) { | |
683 return err; | |
684 } | |
685 } | |
686 } | |
687 } | |
688 | |
689 // Get off stack monitors. (e.g. acquired via jni MonitorEnter). | |
690 JvmtiMonitorClosure jmc(java_thread, calling_thread, owned_monitors_list, this); | |
691 ObjectSynchronizer::monitors_iterate(&jmc); | |
692 err = jmc.error(); | |
693 | |
694 return err; | |
695 } | |
696 | |
697 // Save JNI local handles for any objects that this frame owns. | |
698 jvmtiError | |
699 JvmtiEnvBase::get_locked_objects_in_frame(JavaThread* calling_thread, JavaThread* java_thread, | |
700 javaVFrame *jvf, GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, int stack_depth) { | |
701 jvmtiError err = JVMTI_ERROR_NONE; | |
702 ResourceMark rm; | |
703 | |
704 GrowableArray<MonitorInfo*>* mons = jvf->monitors(); | |
705 if (mons->is_empty()) { | |
706 return err; // this javaVFrame holds no monitors | |
707 } | |
708 | |
709 HandleMark hm; | |
710 oop wait_obj = NULL; | |
711 { | |
712 // save object of current wait() call (if any) for later comparison | |
713 ObjectMonitor *mon = java_thread->current_waiting_monitor(); | |
714 if (mon != NULL) { | |
715 wait_obj = (oop)mon->object(); | |
716 } | |
717 } | |
718 oop pending_obj = NULL; | |
719 { | |
720 // save object of current enter() call (if any) for later comparison | |
721 ObjectMonitor *mon = java_thread->current_pending_monitor(); | |
722 if (mon != NULL) { | |
723 pending_obj = (oop)mon->object(); | |
724 } | |
725 } | |
726 | |
727 for (int i = 0; i < mons->length(); i++) { | |
728 MonitorInfo *mi = mons->at(i); | |
729 | |
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730 if (mi->owner_is_scalar_replaced()) continue; |
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731 |
0 | 732 oop obj = mi->owner(); |
733 if (obj == NULL) { | |
734 // this monitor doesn't have an owning object so skip it | |
735 continue; | |
736 } | |
737 | |
738 if (wait_obj == obj) { | |
739 // the thread is waiting on this monitor so it isn't really owned | |
740 continue; | |
741 } | |
742 | |
743 if (pending_obj == obj) { | |
744 // the thread is pending on this monitor so it isn't really owned | |
745 continue; | |
746 } | |
747 | |
748 if (owned_monitors_list->length() > 0) { | |
749 // Our list has at least one object on it so we have to check | |
750 // for recursive object locking | |
751 bool found = false; | |
752 for (int j = 0; j < owned_monitors_list->length(); j++) { | |
753 jobject jobj = ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(j))->monitor; | |
754 oop check = JNIHandles::resolve(jobj); | |
755 if (check == obj) { | |
756 found = true; // we found the object | |
757 break; | |
758 } | |
759 } | |
760 | |
761 if (found) { | |
762 // already have this object so don't include it | |
763 continue; | |
764 } | |
765 } | |
766 | |
767 // add the owning object to our list | |
768 jvmtiMonitorStackDepthInfo *jmsdi; | |
769 err = allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); | |
770 if (err != JVMTI_ERROR_NONE) { | |
771 return err; | |
772 } | |
773 Handle hobj(obj); | |
774 jmsdi->monitor = jni_reference(calling_thread, hobj); | |
775 jmsdi->stack_depth = stack_depth; | |
776 owned_monitors_list->append(jmsdi); | |
777 } | |
778 | |
779 return err; | |
780 } | |
781 | |
782 jvmtiError | |
783 JvmtiEnvBase::get_stack_trace(JavaThread *java_thread, | |
784 jint start_depth, jint max_count, | |
785 jvmtiFrameInfo* frame_buffer, jint* count_ptr) { | |
786 #ifdef ASSERT | |
787 uint32_t debug_bits = 0; | |
788 #endif | |
789 assert((SafepointSynchronize::is_at_safepoint() || | |
790 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
791 "at safepoint or target thread is suspended"); | |
792 int count = 0; | |
793 if (java_thread->has_last_Java_frame()) { | |
794 RegisterMap reg_map(java_thread); | |
795 Thread* current_thread = Thread::current(); | |
796 ResourceMark rm(current_thread); | |
797 javaVFrame *jvf = java_thread->last_java_vframe(®_map); | |
798 HandleMark hm(current_thread); | |
799 if (start_depth != 0) { | |
800 if (start_depth > 0) { | |
801 for (int j = 0; j < start_depth && jvf != NULL; j++) { | |
802 jvf = jvf->java_sender(); | |
803 } | |
804 if (jvf == NULL) { | |
805 // start_depth is deeper than the stack depth | |
806 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
807 } | |
808 } else { // start_depth < 0 | |
809 // we are referencing the starting depth based on the oldest | |
810 // part of the stack. | |
811 // optimize to limit the number of times that java_sender() is called | |
812 javaVFrame *jvf_cursor = jvf; | |
813 javaVFrame *jvf_prev = NULL; | |
814 javaVFrame *jvf_prev_prev; | |
815 int j = 0; | |
816 while (jvf_cursor != NULL) { | |
817 jvf_prev_prev = jvf_prev; | |
818 jvf_prev = jvf_cursor; | |
819 for (j = 0; j > start_depth && jvf_cursor != NULL; j--) { | |
820 jvf_cursor = jvf_cursor->java_sender(); | |
821 } | |
822 } | |
823 if (j == start_depth) { | |
824 // previous pointer is exactly where we want to start | |
825 jvf = jvf_prev; | |
826 } else { | |
827 // we need to back up further to get to the right place | |
828 if (jvf_prev_prev == NULL) { | |
829 // the -start_depth is greater than the stack depth | |
830 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
831 } | |
832 // j now is the number of frames on the stack starting with | |
833 // jvf_prev, we start from jvf_prev_prev and move older on | |
834 // the stack that many, the result is -start_depth frames | |
835 // remaining. | |
836 jvf = jvf_prev_prev; | |
837 for (; j < 0; j++) { | |
838 jvf = jvf->java_sender(); | |
839 } | |
840 } | |
841 } | |
842 } | |
843 for (; count < max_count && jvf != NULL; count++) { | |
844 frame_buffer[count].method = jvf->method()->jmethod_id(); | |
845 frame_buffer[count].location = (jvf->method()->is_native() ? -1 : jvf->bci()); | |
846 jvf = jvf->java_sender(); | |
847 } | |
848 } else { | |
849 if (start_depth != 0) { | |
850 // no frames and there is a starting depth | |
851 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
852 } | |
853 } | |
854 *count_ptr = count; | |
855 return JVMTI_ERROR_NONE; | |
856 } | |
857 | |
858 jvmtiError | |
859 JvmtiEnvBase::get_frame_count(JvmtiThreadState *state, jint *count_ptr) { | |
860 assert((state != NULL), | |
861 "JavaThread should create JvmtiThreadState before calling this method"); | |
862 *count_ptr = state->count_frames(); | |
863 return JVMTI_ERROR_NONE; | |
864 } | |
865 | |
866 jvmtiError | |
867 JvmtiEnvBase::get_frame_location(JavaThread *java_thread, jint depth, | |
868 jmethodID* method_ptr, jlocation* location_ptr) { | |
869 #ifdef ASSERT | |
870 uint32_t debug_bits = 0; | |
871 #endif | |
872 assert((SafepointSynchronize::is_at_safepoint() || | |
873 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
874 "at safepoint or target thread is suspended"); | |
875 Thread* current_thread = Thread::current(); | |
876 ResourceMark rm(current_thread); | |
877 | |
878 vframe *vf = vframeFor(java_thread, depth); | |
879 if (vf == NULL) { | |
880 return JVMTI_ERROR_NO_MORE_FRAMES; | |
881 } | |
882 | |
883 // vframeFor should return a java frame. If it doesn't | |
884 // it means we've got an internal error and we return the | |
885 // error in product mode. In debug mode we will instead | |
886 // attempt to cast the vframe to a javaVFrame and will | |
887 // cause an assertion/crash to allow further diagnosis. | |
888 #ifdef PRODUCT | |
889 if (!vf->is_java_frame()) { | |
890 return JVMTI_ERROR_INTERNAL; | |
891 } | |
892 #endif | |
893 | |
894 HandleMark hm(current_thread); | |
895 javaVFrame *jvf = javaVFrame::cast(vf); | |
896 methodOop method = jvf->method(); | |
897 if (method->is_native()) { | |
898 *location_ptr = -1; | |
899 } else { | |
900 *location_ptr = jvf->bci(); | |
901 } | |
902 *method_ptr = method->jmethod_id(); | |
903 | |
904 return JVMTI_ERROR_NONE; | |
905 } | |
906 | |
907 | |
908 jvmtiError | |
909 JvmtiEnvBase::get_object_monitor_usage(JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) { | |
910 HandleMark hm; | |
911 Handle hobj; | |
912 | |
913 bool at_safepoint = SafepointSynchronize::is_at_safepoint(); | |
914 | |
915 // Check arguments | |
916 { | |
917 oop mirror = JNIHandles::resolve_external_guard(object); | |
918 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT); | |
919 NULL_CHECK(info_ptr, JVMTI_ERROR_NULL_POINTER); | |
920 | |
921 hobj = Handle(mirror); | |
922 } | |
923 | |
924 JavaThread *owning_thread = NULL; | |
925 ObjectMonitor *mon = NULL; | |
926 jvmtiMonitorUsage ret = { | |
927 NULL, 0, 0, NULL, 0, NULL | |
928 }; | |
929 | |
930 uint32_t debug_bits = 0; | |
931 // first derive the object's owner and entry_count (if any) | |
932 { | |
933 // Revoke any biases before querying the mark word | |
934 if (SafepointSynchronize::is_at_safepoint()) { | |
935 BiasedLocking::revoke_at_safepoint(hobj); | |
936 } else { | |
937 BiasedLocking::revoke_and_rebias(hobj, false, calling_thread); | |
938 } | |
939 | |
940 address owner = NULL; | |
941 { | |
942 markOop mark = hobj()->mark(); | |
943 | |
944 if (!mark->has_monitor()) { | |
945 // this object has a lightweight monitor | |
946 | |
947 if (mark->has_locker()) { | |
948 owner = (address)mark->locker(); // save the address of the Lock word | |
949 } | |
950 // implied else: no owner | |
951 } else { | |
952 // this object has a heavyweight monitor | |
953 mon = mark->monitor(); | |
954 | |
955 // The owner field of a heavyweight monitor may be NULL for no | |
956 // owner, a JavaThread * or it may still be the address of the | |
957 // Lock word in a JavaThread's stack. A monitor can be inflated | |
958 // by a non-owning JavaThread, but only the owning JavaThread | |
959 // can change the owner field from the Lock word to the | |
960 // JavaThread * and it may not have done that yet. | |
961 owner = (address)mon->owner(); | |
962 } | |
963 } | |
964 | |
965 if (owner != NULL) { | |
966 // This monitor is owned so we have to find the owning JavaThread. | |
967 // Since owning_thread_from_monitor_owner() grabs a lock, GC can | |
968 // move our object at this point. However, our owner value is safe | |
969 // since it is either the Lock word on a stack or a JavaThread *. | |
970 owning_thread = Threads::owning_thread_from_monitor_owner(owner, !at_safepoint); | |
971 assert(owning_thread != NULL, "sanity check"); | |
972 if (owning_thread != NULL) { // robustness | |
973 // The monitor's owner either has to be the current thread, at safepoint | |
974 // or it has to be suspended. Any of these conditions will prevent both | |
975 // contending and waiting threads from modifying the state of | |
976 // the monitor. | |
977 if (!at_safepoint && !JvmtiEnv::is_thread_fully_suspended(owning_thread, true, &debug_bits)) { | |
978 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
979 } | |
980 HandleMark hm; | |
981 Handle th(owning_thread->threadObj()); | |
982 ret.owner = (jthread)jni_reference(calling_thread, th); | |
983 } | |
984 // implied else: no owner | |
985 } | |
986 | |
987 if (owning_thread != NULL) { // monitor is owned | |
988 if ((address)owning_thread == owner) { | |
989 // the owner field is the JavaThread * | |
990 assert(mon != NULL, | |
991 "must have heavyweight monitor with JavaThread * owner"); | |
992 ret.entry_count = mon->recursions() + 1; | |
993 } else { | |
994 // The owner field is the Lock word on the JavaThread's stack | |
995 // so the recursions field is not valid. We have to count the | |
996 // number of recursive monitor entries the hard way. We pass | |
997 // a handle to survive any GCs along the way. | |
998 ResourceMark rm; | |
999 ret.entry_count = count_locked_objects(owning_thread, hobj); | |
1000 } | |
1001 } | |
1002 // implied else: entry_count == 0 | |
1003 } | |
1004 | |
1005 int nWant,nWait; | |
1006 if (mon != NULL) { | |
1007 // this object has a heavyweight monitor | |
1008 nWant = mon->contentions(); // # of threads contending for monitor | |
1009 nWait = mon->waiters(); // # of threads in Object.wait() | |
1010 ret.waiter_count = nWant + nWait; | |
1011 ret.notify_waiter_count = nWait; | |
1012 } else { | |
1013 // this object has a lightweight monitor | |
1014 ret.waiter_count = 0; | |
1015 ret.notify_waiter_count = 0; | |
1016 } | |
1017 | |
1018 // Allocate memory for heavyweight and lightweight monitor. | |
1019 jvmtiError err; | |
1020 err = allocate(ret.waiter_count * sizeof(jthread *), (unsigned char**)&ret.waiters); | |
1021 if (err != JVMTI_ERROR_NONE) { | |
1022 return err; | |
1023 } | |
1024 err = allocate(ret.notify_waiter_count * sizeof(jthread *), | |
1025 (unsigned char**)&ret.notify_waiters); | |
1026 if (err != JVMTI_ERROR_NONE) { | |
1027 deallocate((unsigned char*)ret.waiters); | |
1028 return err; | |
1029 } | |
1030 | |
1031 // now derive the rest of the fields | |
1032 if (mon != NULL) { | |
1033 // this object has a heavyweight monitor | |
1034 | |
1035 // Number of waiters may actually be less than the waiter count. | |
1036 // So NULL out memory so that unused memory will be NULL. | |
1037 memset(ret.waiters, 0, ret.waiter_count * sizeof(jthread *)); | |
1038 memset(ret.notify_waiters, 0, ret.notify_waiter_count * sizeof(jthread *)); | |
1039 | |
1040 if (ret.waiter_count > 0) { | |
1041 // we have contending and/or waiting threads | |
1042 HandleMark hm; | |
1043 if (nWant > 0) { | |
1044 // we have contending threads | |
1045 ResourceMark rm; | |
1046 // get_pending_threads returns only java thread so we do not need to | |
1047 // check for non java threads. | |
1048 GrowableArray<JavaThread*>* wantList = Threads::get_pending_threads( | |
1049 nWant, (address)mon, !at_safepoint); | |
1050 if (wantList->length() < nWant) { | |
1051 // robustness: the pending list has gotten smaller | |
1052 nWant = wantList->length(); | |
1053 } | |
1054 for (int i = 0; i < nWant; i++) { | |
1055 JavaThread *pending_thread = wantList->at(i); | |
1056 // If the monitor has no owner, then a non-suspended contending | |
1057 // thread could potentially change the state of the monitor by | |
1058 // entering it. The JVM/TI spec doesn't allow this. | |
1059 if (owning_thread == NULL && !at_safepoint & | |
1060 !JvmtiEnv::is_thread_fully_suspended(pending_thread, true, &debug_bits)) { | |
1061 if (ret.owner != NULL) { | |
1062 destroy_jni_reference(calling_thread, ret.owner); | |
1063 } | |
1064 for (int j = 0; j < i; j++) { | |
1065 destroy_jni_reference(calling_thread, ret.waiters[j]); | |
1066 } | |
1067 deallocate((unsigned char*)ret.waiters); | |
1068 deallocate((unsigned char*)ret.notify_waiters); | |
1069 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
1070 } | |
1071 Handle th(pending_thread->threadObj()); | |
1072 ret.waiters[i] = (jthread)jni_reference(calling_thread, th); | |
1073 } | |
1074 } | |
1075 if (nWait > 0) { | |
1076 // we have threads in Object.wait() | |
1077 int offset = nWant; // add after any contending threads | |
1078 ObjectWaiter *waiter = mon->first_waiter(); | |
1079 for (int i = 0, j = 0; i < nWait; i++) { | |
1080 if (waiter == NULL) { | |
1081 // robustness: the waiting list has gotten smaller | |
1082 nWait = j; | |
1083 break; | |
1084 } | |
1085 Thread *t = mon->thread_of_waiter(waiter); | |
1086 if (t != NULL && t->is_Java_thread()) { | |
1087 JavaThread *wjava_thread = (JavaThread *)t; | |
1088 // If the thread was found on the ObjectWaiter list, then | |
1089 // it has not been notified. This thread can't change the | |
1090 // state of the monitor so it doesn't need to be suspended. | |
1091 Handle th(wjava_thread->threadObj()); | |
1092 ret.waiters[offset + j] = (jthread)jni_reference(calling_thread, th); | |
1093 ret.notify_waiters[j++] = (jthread)jni_reference(calling_thread, th); | |
1094 } | |
1095 waiter = mon->next_waiter(waiter); | |
1096 } | |
1097 } | |
1098 } | |
1099 | |
1100 // Adjust count. nWant and nWait count values may be less than original. | |
1101 ret.waiter_count = nWant + nWait; | |
1102 ret.notify_waiter_count = nWait; | |
1103 } else { | |
1104 // this object has a lightweight monitor and we have nothing more | |
1105 // to do here because the defaults are just fine. | |
1106 } | |
1107 | |
1108 // we don't update return parameter unless everything worked | |
1109 *info_ptr = ret; | |
1110 | |
1111 return JVMTI_ERROR_NONE; | |
1112 } | |
1113 | |
1114 ResourceTracker::ResourceTracker(JvmtiEnv* env) { | |
1115 _env = env; | |
1116 _allocations = new (ResourceObj::C_HEAP) GrowableArray<unsigned char*>(20, true); | |
1117 _failed = false; | |
1118 } | |
1119 ResourceTracker::~ResourceTracker() { | |
1120 if (_failed) { | |
1121 for (int i=0; i<_allocations->length(); i++) { | |
1122 _env->deallocate(_allocations->at(i)); | |
1123 } | |
1124 } | |
1125 delete _allocations; | |
1126 } | |
1127 | |
1128 jvmtiError ResourceTracker::allocate(jlong size, unsigned char** mem_ptr) { | |
1129 unsigned char *ptr; | |
1130 jvmtiError err = _env->allocate(size, &ptr); | |
1131 if (err == JVMTI_ERROR_NONE) { | |
1132 _allocations->append(ptr); | |
1133 *mem_ptr = ptr; | |
1134 } else { | |
1135 *mem_ptr = NULL; | |
1136 _failed = true; | |
1137 } | |
1138 return err; | |
1139 } | |
1140 | |
1141 unsigned char* ResourceTracker::allocate(jlong size) { | |
1142 unsigned char* ptr; | |
1143 allocate(size, &ptr); | |
1144 return ptr; | |
1145 } | |
1146 | |
1147 char* ResourceTracker::strdup(const char* str) { | |
1148 char *dup_str = (char*)allocate(strlen(str)+1); | |
1149 if (dup_str != NULL) { | |
1150 strcpy(dup_str, str); | |
1151 } | |
1152 return dup_str; | |
1153 } | |
1154 | |
1155 struct StackInfoNode { | |
1156 struct StackInfoNode *next; | |
1157 jvmtiStackInfo info; | |
1158 }; | |
1159 | |
1160 // Create a jvmtiStackInfo inside a linked list node and create a | |
1161 // buffer for the frame information, both allocated as resource objects. | |
1162 // Fill in both the jvmtiStackInfo and the jvmtiFrameInfo. | |
1163 // Note that either or both of thr and thread_oop | |
1164 // may be null if the thread is new or has exited. | |
1165 void | |
1166 VM_GetMultipleStackTraces::fill_frames(jthread jt, JavaThread *thr, oop thread_oop) { | |
1167 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1168 | |
1169 jint state = 0; | |
1170 struct StackInfoNode *node = NEW_RESOURCE_OBJ(struct StackInfoNode); | |
1171 jvmtiStackInfo *infop = &(node->info); | |
1172 node->next = head(); | |
1173 set_head(node); | |
1174 infop->frame_count = 0; | |
1175 infop->thread = jt; | |
1176 | |
1177 if (thread_oop != NULL) { | |
1178 // get most state bits | |
1179 state = (jint)java_lang_Thread::get_thread_status(thread_oop); | |
1180 } | |
1181 | |
1182 if (thr != NULL) { // add more state bits if there is a JavaThead to query | |
1183 // same as is_being_ext_suspended() but without locking | |
1184 if (thr->is_ext_suspended() || thr->is_external_suspend()) { | |
1185 state |= JVMTI_THREAD_STATE_SUSPENDED; | |
1186 } | |
1187 JavaThreadState jts = thr->thread_state(); | |
1188 if (jts == _thread_in_native) { | |
1189 state |= JVMTI_THREAD_STATE_IN_NATIVE; | |
1190 } | |
1191 OSThread* osThread = thr->osthread(); | |
1192 if (osThread != NULL && osThread->interrupted()) { | |
1193 state |= JVMTI_THREAD_STATE_INTERRUPTED; | |
1194 } | |
1195 } | |
1196 infop->state = state; | |
1197 | |
1198 if (thr != NULL || (state & JVMTI_THREAD_STATE_ALIVE) != 0) { | |
1199 infop->frame_buffer = NEW_RESOURCE_ARRAY(jvmtiFrameInfo, max_frame_count()); | |
1200 env()->get_stack_trace(thr, 0, max_frame_count(), | |
1201 infop->frame_buffer, &(infop->frame_count)); | |
1202 } else { | |
1203 infop->frame_buffer = NULL; | |
1204 infop->frame_count = 0; | |
1205 } | |
1206 _frame_count_total += infop->frame_count; | |
1207 } | |
1208 | |
1209 // Based on the stack information in the linked list, allocate memory | |
1210 // block to return and fill it from the info in the linked list. | |
1211 void | |
1212 VM_GetMultipleStackTraces::allocate_and_fill_stacks(jint thread_count) { | |
1213 // do I need to worry about alignment issues? | |
1214 jlong alloc_size = thread_count * sizeof(jvmtiStackInfo) | |
1215 + _frame_count_total * sizeof(jvmtiFrameInfo); | |
1216 env()->allocate(alloc_size, (unsigned char **)&_stack_info); | |
1217 | |
1218 // pointers to move through the newly allocated space as it is filled in | |
1219 jvmtiStackInfo *si = _stack_info + thread_count; // bottom of stack info | |
1220 jvmtiFrameInfo *fi = (jvmtiFrameInfo *)si; // is the top of frame info | |
1221 | |
1222 // copy information in resource area into allocated buffer | |
1223 // insert stack info backwards since linked list is backwards | |
1224 // insert frame info forwards | |
1225 // walk the StackInfoNodes | |
1226 for (struct StackInfoNode *sin = head(); sin != NULL; sin = sin->next) { | |
1227 jint frame_count = sin->info.frame_count; | |
1228 size_t frames_size = frame_count * sizeof(jvmtiFrameInfo); | |
1229 --si; | |
1230 memcpy(si, &(sin->info), sizeof(jvmtiStackInfo)); | |
1231 if (frames_size == 0) { | |
1232 si->frame_buffer = NULL; | |
1233 } else { | |
1234 memcpy(fi, sin->info.frame_buffer, frames_size); | |
1235 si->frame_buffer = fi; // point to the new allocated copy of the frames | |
1236 fi += frame_count; | |
1237 } | |
1238 } | |
1239 assert(si == _stack_info, "the last copied stack info must be the first record"); | |
1240 assert((unsigned char *)fi == ((unsigned char *)_stack_info) + alloc_size, | |
1241 "the last copied frame info must be the last record"); | |
1242 } | |
1243 | |
1244 | |
1245 void | |
1246 VM_GetThreadListStackTraces::doit() { | |
1247 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1248 | |
1249 ResourceMark rm; | |
1250 for (int i = 0; i < _thread_count; ++i) { | |
1251 jthread jt = _thread_list[i]; | |
1252 oop thread_oop = JNIHandles::resolve_external_guard(jt); | |
1253 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::thread_klass())) { | |
1254 set_result(JVMTI_ERROR_INVALID_THREAD); | |
1255 return; | |
1256 } | |
1257 fill_frames(jt, java_lang_Thread::thread(thread_oop), thread_oop); | |
1258 } | |
1259 allocate_and_fill_stacks(_thread_count); | |
1260 } | |
1261 | |
1262 void | |
1263 VM_GetAllStackTraces::doit() { | |
1264 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1265 | |
1266 ResourceMark rm; | |
1267 _final_thread_count = 0; | |
1268 for (JavaThread *jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
1269 oop thread_oop = jt->threadObj(); | |
1270 if (thread_oop != NULL && | |
1271 !jt->is_exiting() && | |
1272 java_lang_Thread::is_alive(thread_oop) && | |
1273 !jt->is_hidden_from_external_view()) { | |
1274 ++_final_thread_count; | |
1275 // Handle block of the calling thread is used to create local refs. | |
1276 fill_frames((jthread)JNIHandles::make_local(_calling_thread, thread_oop), | |
1277 jt, thread_oop); | |
1278 } | |
1279 } | |
1280 allocate_and_fill_stacks(_final_thread_count); | |
1281 } | |
1282 | |
1283 // Verifies that the top frame is a java frame in an expected state. | |
1284 // Deoptimizes frame if needed. | |
1285 // Checks that the frame method signature matches the return type (tos). | |
1286 // HandleMark must be defined in the caller only. | |
1287 // It is to keep a ret_ob_h handle alive after return to the caller. | |
1288 jvmtiError | |
1289 JvmtiEnvBase::check_top_frame(JavaThread* current_thread, JavaThread* java_thread, | |
1290 jvalue value, TosState tos, Handle* ret_ob_h) { | |
1291 ResourceMark rm(current_thread); | |
1292 | |
1293 vframe *vf = vframeFor(java_thread, 0); | |
1294 NULL_CHECK(vf, JVMTI_ERROR_NO_MORE_FRAMES); | |
1295 | |
1296 javaVFrame *jvf = (javaVFrame*) vf; | |
1297 if (!vf->is_java_frame() || jvf->method()->is_native()) { | |
1298 return JVMTI_ERROR_OPAQUE_FRAME; | |
1299 } | |
1300 | |
1301 // If the frame is a compiled one, need to deoptimize it. | |
1302 if (vf->is_compiled_frame()) { | |
1303 if (!vf->fr().can_be_deoptimized()) { | |
1304 return JVMTI_ERROR_OPAQUE_FRAME; | |
1305 } | |
1306 VM_DeoptimizeFrame deopt(java_thread, jvf->fr().id()); | |
1307 VMThread::execute(&deopt); | |
1308 } | |
1309 | |
1310 // Get information about method return type | |
1311 symbolHandle signature(current_thread, jvf->method()->signature()); | |
1312 | |
1313 ResultTypeFinder rtf(signature); | |
1314 TosState fr_tos = as_TosState(rtf.type()); | |
1315 if (fr_tos != tos) { | |
1316 if (tos != itos || (fr_tos != btos && fr_tos != ctos && fr_tos != stos)) { | |
1317 return JVMTI_ERROR_TYPE_MISMATCH; | |
1318 } | |
1319 } | |
1320 | |
1321 // Check that the jobject class matches the return type signature. | |
1322 jobject jobj = value.l; | |
1323 if (tos == atos && jobj != NULL) { // NULL reference is allowed | |
1324 Handle ob_h = Handle(current_thread, JNIHandles::resolve_external_guard(jobj)); | |
1325 NULL_CHECK(ob_h, JVMTI_ERROR_INVALID_OBJECT); | |
1326 KlassHandle ob_kh = KlassHandle(current_thread, ob_h()->klass()); | |
1327 NULL_CHECK(ob_kh, JVMTI_ERROR_INVALID_OBJECT); | |
1328 | |
1329 // Method return type signature. | |
1330 char* ty_sign = 1 + strchr(signature->as_C_string(), ')'); | |
1331 | |
1332 if (!VM_GetOrSetLocal::is_assignable(ty_sign, Klass::cast(ob_kh()), current_thread)) { | |
1333 return JVMTI_ERROR_TYPE_MISMATCH; | |
1334 } | |
1335 *ret_ob_h = ob_h; | |
1336 } | |
1337 return JVMTI_ERROR_NONE; | |
1338 } /* end check_top_frame */ | |
1339 | |
1340 | |
1341 // ForceEarlyReturn<type> follows the PopFrame approach in many aspects. | |
1342 // Main difference is on the last stage in the interpreter. | |
1343 // The PopFrame stops method execution to continue execution | |
1344 // from the same method call instruction. | |
1345 // The ForceEarlyReturn forces return from method so the execution | |
1346 // continues at the bytecode following the method call. | |
1347 | |
1348 // Threads_lock NOT held, java_thread not protected by lock | |
1349 // java_thread - pre-checked | |
1350 | |
1351 jvmtiError | |
1352 JvmtiEnvBase::force_early_return(JavaThread* java_thread, jvalue value, TosState tos) { | |
1353 JavaThread* current_thread = JavaThread::current(); | |
1354 HandleMark hm(current_thread); | |
1355 uint32_t debug_bits = 0; | |
1356 | |
609
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1357 // retrieve or create the state |
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1358 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); |
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1359 if (state == NULL) { |
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1360 return JVMTI_ERROR_THREAD_NOT_ALIVE; |
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1361 } |
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1362 |
0 | 1363 // Check if java_thread is fully suspended |
1364 if (!is_thread_fully_suspended(java_thread, | |
1365 true /* wait for suspend completion */, | |
1366 &debug_bits)) { | |
1367 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
1368 } | |
1369 | |
1370 // Check to see if a ForceEarlyReturn was already in progress | |
1371 if (state->is_earlyret_pending()) { | |
1372 // Probably possible for JVMTI clients to trigger this, but the | |
1373 // JPDA backend shouldn't allow this to happen | |
1374 return JVMTI_ERROR_INTERNAL; | |
1375 } | |
1376 { | |
1377 // The same as for PopFrame. Workaround bug: | |
1378 // 4812902: popFrame hangs if the method is waiting at a synchronize | |
1379 // Catch this condition and return an error to avoid hanging. | |
1380 // Now JVMTI spec allows an implementation to bail out with an opaque | |
1381 // frame error. | |
1382 OSThread* osThread = java_thread->osthread(); | |
1383 if (osThread->get_state() == MONITOR_WAIT) { | |
1384 return JVMTI_ERROR_OPAQUE_FRAME; | |
1385 } | |
1386 } | |
1387 Handle ret_ob_h = Handle(); | |
1388 jvmtiError err = check_top_frame(current_thread, java_thread, value, tos, &ret_ob_h); | |
1389 if (err != JVMTI_ERROR_NONE) { | |
1390 return err; | |
1391 } | |
1392 assert(tos != atos || value.l == NULL || ret_ob_h() != NULL, | |
1393 "return object oop must not be NULL if jobject is not NULL"); | |
1394 | |
1395 // Update the thread state to reflect that the top frame must be | |
1396 // forced to return. | |
1397 // The current frame will be returned later when the suspended | |
1398 // thread is resumed and right before returning from VM to Java. | |
1399 // (see call_VM_base() in assembler_<cpu>.cpp). | |
1400 | |
1401 state->set_earlyret_pending(); | |
1402 state->set_earlyret_oop(ret_ob_h()); | |
1403 state->set_earlyret_value(value, tos); | |
1404 | |
1405 // Set pending step flag for this early return. | |
1406 // It is cleared when next step event is posted. | |
1407 state->set_pending_step_for_earlyret(); | |
1408 | |
1409 return JVMTI_ERROR_NONE; | |
1410 } /* end force_early_return */ | |
1411 | |
1412 void | |
1413 JvmtiMonitorClosure::do_monitor(ObjectMonitor* mon) { | |
1414 if ( _error != JVMTI_ERROR_NONE) { | |
1415 // Error occurred in previous iteration so no need to add | |
1416 // to the list. | |
1417 return; | |
1418 } | |
1419 if (mon->owner() == _java_thread ) { | |
1420 // Filter out on stack monitors collected during stack walk. | |
1421 oop obj = (oop)mon->object(); | |
1422 bool found = false; | |
1423 for (int j = 0; j < _owned_monitors_list->length(); j++) { | |
1424 jobject jobj = ((jvmtiMonitorStackDepthInfo*)_owned_monitors_list->at(j))->monitor; | |
1425 oop check = JNIHandles::resolve(jobj); | |
1426 if (check == obj) { | |
1427 // On stack monitor already collected during the stack walk. | |
1428 found = true; | |
1429 break; | |
1430 } | |
1431 } | |
1432 if (found == false) { | |
1433 // This is off stack monitor (e.g. acquired via jni MonitorEnter). | |
1434 jvmtiError err; | |
1435 jvmtiMonitorStackDepthInfo *jmsdi; | |
1436 err = _env->allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); | |
1437 if (err != JVMTI_ERROR_NONE) { | |
1438 _error = err; | |
1439 return; | |
1440 } | |
1441 Handle hobj(obj); | |
1442 jmsdi->monitor = _env->jni_reference(_calling_thread, hobj); | |
1443 // stack depth is unknown for this monitor. | |
1444 jmsdi->stack_depth = -1; | |
1445 _owned_monitors_list->append(jmsdi); | |
1446 } | |
1447 } | |
1448 } | |
1449 | |
1450 #endif // !JVMTI_KERNEL |