Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiEnvBase.cpp @ 3763:e66f38dd58a9
Merge
author | ysr |
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date | Wed, 08 Jun 2011 08:39:53 -0700 |
parents | c7f3d0b4570f |
children | e6b1331a51d2 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/systemDictionary.hpp" | |
27 #include "jvmtifiles/jvmtiEnv.hpp" | |
28 #include "oops/objArrayKlass.hpp" | |
29 #include "oops/objArrayOop.hpp" | |
30 #include "prims/jvmtiEnvBase.hpp" | |
31 #include "prims/jvmtiEventController.inline.hpp" | |
32 #include "prims/jvmtiExtensions.hpp" | |
33 #include "prims/jvmtiImpl.hpp" | |
34 #include "prims/jvmtiManageCapabilities.hpp" | |
35 #include "prims/jvmtiTagMap.hpp" | |
36 #include "prims/jvmtiThreadState.inline.hpp" | |
37 #include "runtime/biasedLocking.hpp" | |
38 #include "runtime/deoptimization.hpp" | |
39 #include "runtime/interfaceSupport.hpp" | |
40 #include "runtime/jfieldIDWorkaround.hpp" | |
41 #include "runtime/objectMonitor.hpp" | |
42 #include "runtime/objectMonitor.inline.hpp" | |
43 #include "runtime/signature.hpp" | |
44 #include "runtime/vframe.hpp" | |
45 #include "runtime/vframe_hp.hpp" | |
46 #include "runtime/vmThread.hpp" | |
47 #include "runtime/vm_operations.hpp" | |
0 | 48 |
49 /////////////////////////////////////////////////////////////// | |
50 // | |
51 // JvmtiEnvBase | |
52 // | |
53 | |
54 JvmtiEnvBase* JvmtiEnvBase::_head_environment = NULL; | |
55 | |
56 bool JvmtiEnvBase::_globally_initialized = false; | |
57 volatile bool JvmtiEnvBase::_needs_clean_up = false; | |
58 | |
59 jvmtiPhase JvmtiEnvBase::_phase = JVMTI_PHASE_PRIMORDIAL; | |
60 | |
61 volatile int JvmtiEnvBase::_dying_thread_env_iteration_count = 0; | |
62 | |
63 extern jvmtiInterface_1_ jvmti_Interface; | |
64 extern jvmtiInterface_1_ jvmtiTrace_Interface; | |
65 | |
66 | |
67 // perform initializations that must occur before any JVMTI environments | |
68 // are released but which should only be initialized once (no matter | |
69 // how many environments are created). | |
70 void | |
71 JvmtiEnvBase::globally_initialize() { | |
72 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
73 assert(_globally_initialized == false, "bad call"); | |
74 | |
75 JvmtiManageCapabilities::initialize(); | |
76 | |
77 #ifndef JVMTI_KERNEL | |
78 // register extension functions and events | |
79 JvmtiExtensions::register_extensions(); | |
80 #endif // !JVMTI_KERNEL | |
81 | |
82 #ifdef JVMTI_TRACE | |
83 JvmtiTrace::initialize(); | |
84 #endif | |
85 | |
86 _globally_initialized = true; | |
87 } | |
88 | |
89 | |
90 void | |
91 JvmtiEnvBase::initialize() { | |
92 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
93 | |
94 // Add this environment to the end of the environment list (order is important) | |
95 { | |
96 // This block of code must not contain any safepoints, as list deallocation | |
97 // (which occurs at a safepoint) cannot occur simultaneously with this list | |
98 // addition. Note: No_Safepoint_Verifier cannot, currently, be used before | |
99 // threads exist. | |
100 JvmtiEnvIterator it; | |
101 JvmtiEnvBase *previous_env = NULL; | |
102 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
103 previous_env = env; | |
104 } | |
105 if (previous_env == NULL) { | |
106 _head_environment = this; | |
107 } else { | |
108 previous_env->set_next_environment(this); | |
109 } | |
110 } | |
111 | |
112 if (_globally_initialized == false) { | |
113 globally_initialize(); | |
114 } | |
115 } | |
116 | |
117 | |
611
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118 bool |
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119 JvmtiEnvBase::is_valid() { |
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120 jint value = 0; |
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121 |
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122 // This object might not be a JvmtiEnvBase so we can't assume |
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123 // the _magic field is properly aligned. Get the value in a safe |
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124 // way and then check against JVMTI_MAGIC. |
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125 |
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126 switch (sizeof(_magic)) { |
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127 case 2: |
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128 value = Bytes::get_native_u2((address)&_magic); |
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129 break; |
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130 |
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131 case 4: |
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132 value = Bytes::get_native_u4((address)&_magic); |
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133 break; |
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134 |
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135 case 8: |
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136 value = Bytes::get_native_u8((address)&_magic); |
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137 break; |
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138 |
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139 default: |
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140 guarantee(false, "_magic field is an unexpected size"); |
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141 } |
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142 |
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143 return value == JVMTI_MAGIC; |
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144 } |
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145 |
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146 |
1122 | 147 bool |
1121 | 148 JvmtiEnvBase::use_version_1_0_semantics() { |
149 int major, minor, micro; | |
150 | |
151 JvmtiExport::decode_version_values(_version, &major, &minor, µ); | |
152 return major == 1 && minor == 0; // micro version doesn't matter here | |
153 } | |
154 | |
155 | |
156 bool | |
157 JvmtiEnvBase::use_version_1_1_semantics() { | |
158 int major, minor, micro; | |
159 | |
160 JvmtiExport::decode_version_values(_version, &major, &minor, µ); | |
161 return major == 1 && minor == 1; // micro version doesn't matter here | |
162 } | |
163 | |
1988 | 164 bool |
165 JvmtiEnvBase::use_version_1_2_semantics() { | |
166 int major, minor, micro; | |
167 | |
168 JvmtiExport::decode_version_values(_version, &major, &minor, µ); | |
169 return major == 1 && minor == 2; // micro version doesn't matter here | |
170 } | |
171 | |
1121 | 172 |
173 JvmtiEnvBase::JvmtiEnvBase(jint version) : _env_event_enable() { | |
174 _version = version; | |
0 | 175 _env_local_storage = NULL; |
176 _tag_map = NULL; | |
177 _native_method_prefix_count = 0; | |
178 _native_method_prefixes = NULL; | |
179 _next = NULL; | |
180 _class_file_load_hook_ever_enabled = false; | |
181 | |
182 // Moot since ClassFileLoadHook not yet enabled. | |
183 // But "true" will give a more predictable ClassFileLoadHook behavior | |
184 // for environment creation during ClassFileLoadHook. | |
185 _is_retransformable = true; | |
186 | |
187 // all callbacks initially NULL | |
188 memset(&_event_callbacks,0,sizeof(jvmtiEventCallbacks)); | |
189 | |
190 // all capabilities initially off | |
191 memset(&_current_capabilities, 0, sizeof(_current_capabilities)); | |
192 | |
193 // all prohibited capabilities initially off | |
194 memset(&_prohibited_capabilities, 0, sizeof(_prohibited_capabilities)); | |
195 | |
196 _magic = JVMTI_MAGIC; | |
197 | |
198 JvmtiEventController::env_initialize((JvmtiEnv*)this); | |
199 | |
200 #ifdef JVMTI_TRACE | |
371 | 201 _jvmti_external.functions = TraceJVMTI != NULL ? &jvmtiTrace_Interface : &jvmti_Interface; |
0 | 202 #else |
203 _jvmti_external.functions = &jvmti_Interface; | |
204 #endif | |
205 } | |
206 | |
207 | |
208 void | |
209 JvmtiEnvBase::dispose() { | |
210 | |
211 #ifdef JVMTI_TRACE | |
212 JvmtiTrace::shutdown(); | |
213 #endif | |
214 | |
215 // Dispose of event info and let the event controller call us back | |
216 // in a locked state (env_dispose, below) | |
217 JvmtiEventController::env_dispose(this); | |
218 } | |
219 | |
220 void | |
221 JvmtiEnvBase::env_dispose() { | |
222 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
223 | |
224 // We have been entered with all events disabled on this environment. | |
225 // A race to re-enable events (by setting callbacks) is prevented by | |
226 // checking for a valid environment when setting callbacks (while | |
227 // holding the JvmtiThreadState_lock). | |
228 | |
229 // Mark as invalid. | |
230 _magic = DISPOSED_MAGIC; | |
231 | |
232 // Relinquish all capabilities. | |
233 jvmtiCapabilities *caps = get_capabilities(); | |
234 JvmtiManageCapabilities::relinquish_capabilities(caps, caps, caps); | |
235 | |
236 // Same situation as with events (see above) | |
237 set_native_method_prefixes(0, NULL); | |
238 | |
239 #ifndef JVMTI_KERNEL | |
240 JvmtiTagMap* tag_map_to_deallocate = _tag_map; | |
241 set_tag_map(NULL); | |
242 // A tag map can be big, deallocate it now | |
243 if (tag_map_to_deallocate != NULL) { | |
244 delete tag_map_to_deallocate; | |
245 } | |
246 #endif // !JVMTI_KERNEL | |
247 | |
248 _needs_clean_up = true; | |
249 } | |
250 | |
251 | |
252 JvmtiEnvBase::~JvmtiEnvBase() { | |
253 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
254 | |
255 // There is a small window of time during which the tag map of a | |
256 // disposed environment could have been reallocated. | |
257 // Make sure it is gone. | |
258 #ifndef JVMTI_KERNEL | |
259 JvmtiTagMap* tag_map_to_deallocate = _tag_map; | |
260 set_tag_map(NULL); | |
261 // A tag map can be big, deallocate it now | |
262 if (tag_map_to_deallocate != NULL) { | |
263 delete tag_map_to_deallocate; | |
264 } | |
265 #endif // !JVMTI_KERNEL | |
266 | |
267 _magic = BAD_MAGIC; | |
268 } | |
269 | |
270 | |
271 void | |
272 JvmtiEnvBase::periodic_clean_up() { | |
273 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
274 | |
275 // JvmtiEnvBase reference is saved in JvmtiEnvThreadState. So | |
276 // clean up JvmtiThreadState before deleting JvmtiEnv pointer. | |
277 JvmtiThreadState::periodic_clean_up(); | |
278 | |
279 // Unlink all invalid environments from the list of environments | |
280 // and deallocate them | |
281 JvmtiEnvIterator it; | |
282 JvmtiEnvBase* previous_env = NULL; | |
283 JvmtiEnvBase* env = it.first(); | |
284 while (env != NULL) { | |
285 if (env->is_valid()) { | |
286 previous_env = env; | |
287 env = it.next(env); | |
288 } else { | |
289 // This one isn't valid, remove it from the list and deallocate it | |
290 JvmtiEnvBase* defunct_env = env; | |
291 env = it.next(env); | |
292 if (previous_env == NULL) { | |
293 _head_environment = env; | |
294 } else { | |
295 previous_env->set_next_environment(env); | |
296 } | |
297 delete defunct_env; | |
298 } | |
299 } | |
300 | |
301 } | |
302 | |
303 | |
304 void | |
305 JvmtiEnvBase::check_for_periodic_clean_up() { | |
306 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
307 | |
308 class ThreadInsideIterationClosure: public ThreadClosure { | |
309 private: | |
310 bool _inside; | |
311 public: | |
312 ThreadInsideIterationClosure() : _inside(false) {}; | |
313 | |
314 void do_thread(Thread* thread) { | |
315 _inside |= thread->is_inside_jvmti_env_iteration(); | |
316 } | |
317 | |
318 bool is_inside_jvmti_env_iteration() { | |
319 return _inside; | |
320 } | |
321 }; | |
322 | |
323 if (_needs_clean_up) { | |
324 // Check if we are currently iterating environment, | |
325 // deallocation should not occur if we are | |
326 ThreadInsideIterationClosure tiic; | |
327 Threads::threads_do(&tiic); | |
328 if (!tiic.is_inside_jvmti_env_iteration() && | |
329 !is_inside_dying_thread_env_iteration()) { | |
330 _needs_clean_up = false; | |
331 JvmtiEnvBase::periodic_clean_up(); | |
332 } | |
333 } | |
334 } | |
335 | |
336 | |
337 void | |
338 JvmtiEnvBase::record_first_time_class_file_load_hook_enabled() { | |
339 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), | |
340 "sanity check"); | |
341 | |
342 if (!_class_file_load_hook_ever_enabled) { | |
343 _class_file_load_hook_ever_enabled = true; | |
344 | |
345 if (get_capabilities()->can_retransform_classes) { | |
346 _is_retransformable = true; | |
347 } else { | |
348 _is_retransformable = false; | |
349 | |
350 // cannot add retransform capability after ClassFileLoadHook has been enabled | |
351 get_prohibited_capabilities()->can_retransform_classes = 1; | |
352 } | |
353 } | |
354 } | |
355 | |
356 | |
357 void | |
358 JvmtiEnvBase::record_class_file_load_hook_enabled() { | |
359 if (!_class_file_load_hook_ever_enabled) { | |
360 if (Threads::number_of_threads() == 0) { | |
361 record_first_time_class_file_load_hook_enabled(); | |
362 } else { | |
363 MutexLocker mu(JvmtiThreadState_lock); | |
364 record_first_time_class_file_load_hook_enabled(); | |
365 } | |
366 } | |
367 } | |
368 | |
369 | |
370 jvmtiError | |
371 JvmtiEnvBase::set_native_method_prefixes(jint prefix_count, char** prefixes) { | |
372 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), | |
373 "sanity check"); | |
374 | |
375 int old_prefix_count = get_native_method_prefix_count(); | |
376 char **old_prefixes = get_native_method_prefixes(); | |
377 | |
378 // allocate and install the new prefixex | |
379 if (prefix_count == 0 || !is_valid()) { | |
380 _native_method_prefix_count = 0; | |
381 _native_method_prefixes = NULL; | |
382 } else { | |
383 // there are prefixes, allocate an array to hold them, and fill it | |
384 char** new_prefixes = (char**)os::malloc((prefix_count) * sizeof(char*)); | |
385 if (new_prefixes == NULL) { | |
386 return JVMTI_ERROR_OUT_OF_MEMORY; | |
387 } | |
388 for (int i = 0; i < prefix_count; i++) { | |
389 char* prefix = prefixes[i]; | |
390 if (prefix == NULL) { | |
391 for (int j = 0; j < (i-1); j++) { | |
392 os::free(new_prefixes[j]); | |
393 } | |
394 os::free(new_prefixes); | |
395 return JVMTI_ERROR_NULL_POINTER; | |
396 } | |
397 prefix = os::strdup(prefixes[i]); | |
398 if (prefix == NULL) { | |
399 for (int j = 0; j < (i-1); j++) { | |
400 os::free(new_prefixes[j]); | |
401 } | |
402 os::free(new_prefixes); | |
403 return JVMTI_ERROR_OUT_OF_MEMORY; | |
404 } | |
405 new_prefixes[i] = prefix; | |
406 } | |
407 _native_method_prefix_count = prefix_count; | |
408 _native_method_prefixes = new_prefixes; | |
409 } | |
410 | |
411 // now that we know the new prefixes have been successfully installed we can | |
412 // safely remove the old ones | |
413 if (old_prefix_count != 0) { | |
414 for (int i = 0; i < old_prefix_count; i++) { | |
415 os::free(old_prefixes[i]); | |
416 } | |
417 os::free(old_prefixes); | |
418 } | |
419 | |
420 return JVMTI_ERROR_NONE; | |
421 } | |
422 | |
423 | |
424 // Collect all the prefixes which have been set in any JVM TI environments | |
425 // by the SetNativeMethodPrefix(es) functions. Be sure to maintain the | |
426 // order of environments and the order of prefixes within each environment. | |
427 // Return in a resource allocated array. | |
428 char** | |
429 JvmtiEnvBase::get_all_native_method_prefixes(int* count_ptr) { | |
430 assert(Threads::number_of_threads() == 0 || | |
431 SafepointSynchronize::is_at_safepoint() || | |
432 JvmtiThreadState_lock->is_locked(), | |
433 "sanity check"); | |
434 | |
435 int total_count = 0; | |
436 GrowableArray<char*>* prefix_array =new GrowableArray<char*>(5); | |
437 | |
438 JvmtiEnvIterator it; | |
439 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
440 int prefix_count = env->get_native_method_prefix_count(); | |
441 char** prefixes = env->get_native_method_prefixes(); | |
442 for (int j = 0; j < prefix_count; j++) { | |
443 // retrieve a prefix and so that it is safe against asynchronous changes | |
444 // copy it into the resource area | |
445 char* prefix = prefixes[j]; | |
446 char* prefix_copy = NEW_RESOURCE_ARRAY(char, strlen(prefix)+1); | |
447 strcpy(prefix_copy, prefix); | |
448 prefix_array->at_put_grow(total_count++, prefix_copy); | |
449 } | |
450 } | |
451 | |
452 char** all_prefixes = NEW_RESOURCE_ARRAY(char*, total_count); | |
453 char** p = all_prefixes; | |
454 for (int i = 0; i < total_count; ++i) { | |
455 *p++ = prefix_array->at(i); | |
456 } | |
457 *count_ptr = total_count; | |
458 return all_prefixes; | |
459 } | |
460 | |
461 void | |
462 JvmtiEnvBase::set_event_callbacks(const jvmtiEventCallbacks* callbacks, | |
463 jint size_of_callbacks) { | |
464 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
465 | |
466 size_t byte_cnt = sizeof(jvmtiEventCallbacks); | |
467 | |
468 // clear in either case to be sure we got any gap between sizes | |
469 memset(&_event_callbacks, 0, byte_cnt); | |
470 | |
471 // Now that JvmtiThreadState_lock is held, prevent a possible race condition where events | |
472 // are re-enabled by a call to set event callbacks where the DisposeEnvironment | |
473 // occurs after the boiler-plate environment check and before the lock is acquired. | |
474 if (callbacks != NULL && is_valid()) { | |
475 if (size_of_callbacks < (jint)byte_cnt) { | |
476 byte_cnt = size_of_callbacks; | |
477 } | |
478 memcpy(&_event_callbacks, callbacks, byte_cnt); | |
479 } | |
480 } | |
481 | |
482 // Called from JVMTI entry points which perform stack walking. If the | |
483 // associated JavaThread is the current thread, then wait_for_suspend | |
484 // is not used. Otherwise, it determines if we should wait for the | |
485 // "other" thread to complete external suspension. (NOTE: in future | |
486 // releases the suspension mechanism should be reimplemented so this | |
487 // is not necessary.) | |
488 // | |
489 bool | |
490 JvmtiEnvBase::is_thread_fully_suspended(JavaThread* thr, bool wait_for_suspend, uint32_t *bits) { | |
491 // "other" threads require special handling | |
492 if (thr != JavaThread::current()) { | |
493 if (wait_for_suspend) { | |
494 // We are allowed to wait for the external suspend to complete | |
495 // so give the other thread a chance to get suspended. | |
496 if (!thr->wait_for_ext_suspend_completion(SuspendRetryCount, | |
497 SuspendRetryDelay, bits)) { | |
498 // didn't make it so let the caller know | |
499 return false; | |
500 } | |
501 } | |
502 // We aren't allowed to wait for the external suspend to complete | |
503 // so if the other thread isn't externally suspended we need to | |
504 // let the caller know. | |
505 else if (!thr->is_ext_suspend_completed_with_lock(bits)) { | |
506 return false; | |
507 } | |
508 } | |
509 | |
510 return true; | |
511 } | |
512 | |
513 | |
514 // In the fullness of time, all users of the method should instead | |
515 // directly use allocate, besides being cleaner and faster, this will | |
516 // mean much better out of memory handling | |
517 unsigned char * | |
518 JvmtiEnvBase::jvmtiMalloc(jlong size) { | |
519 unsigned char* mem; | |
520 jvmtiError result = allocate(size, &mem); | |
521 assert(result == JVMTI_ERROR_NONE, "Allocate failed"); | |
522 return mem; | |
523 } | |
524 | |
525 | |
526 // | |
527 // Threads | |
528 // | |
529 | |
530 jobject * | |
531 JvmtiEnvBase::new_jobjectArray(int length, Handle *handles) { | |
532 if (length == 0) { | |
533 return NULL; | |
534 } | |
535 | |
536 jobject *objArray = (jobject *) jvmtiMalloc(sizeof(jobject) * length); | |
537 NULL_CHECK(objArray, NULL); | |
538 | |
539 for (int i=0; i<length; i++) { | |
540 objArray[i] = jni_reference(handles[i]); | |
541 } | |
542 return objArray; | |
543 } | |
544 | |
545 jthread * | |
546 JvmtiEnvBase::new_jthreadArray(int length, Handle *handles) { | |
547 return (jthread *) new_jobjectArray(length,handles); | |
548 } | |
549 | |
550 jthreadGroup * | |
551 JvmtiEnvBase::new_jthreadGroupArray(int length, Handle *handles) { | |
552 return (jthreadGroup *) new_jobjectArray(length,handles); | |
553 } | |
554 | |
555 | |
556 JavaThread * | |
557 JvmtiEnvBase::get_JavaThread(jthread jni_thread) { | |
558 oop t = JNIHandles::resolve_external_guard(jni_thread); | |
1142 | 559 if (t == NULL || !t->is_a(SystemDictionary::Thread_klass())) { |
0 | 560 return NULL; |
561 } | |
562 // The following returns NULL if the thread has not yet run or is in | |
563 // process of exiting | |
564 return java_lang_Thread::thread(t); | |
565 } | |
566 | |
567 | |
568 // update the access_flags for the field in the klass | |
569 void | |
570 JvmtiEnvBase::update_klass_field_access_flag(fieldDescriptor *fd) { | |
571 instanceKlass* ik = instanceKlass::cast(fd->field_holder()); | |
572 typeArrayOop fields = ik->fields(); | |
573 fields->ushort_at_put(fd->index(), (jushort)fd->access_flags().as_short()); | |
574 } | |
575 | |
576 | |
577 // return the vframe on the specified thread and depth, NULL if no such frame | |
578 vframe* | |
579 JvmtiEnvBase::vframeFor(JavaThread* java_thread, jint depth) { | |
580 if (!java_thread->has_last_Java_frame()) { | |
581 return NULL; | |
582 } | |
583 RegisterMap reg_map(java_thread); | |
584 vframe *vf = java_thread->last_java_vframe(®_map); | |
585 int d = 0; | |
586 while ((vf != NULL) && (d < depth)) { | |
587 vf = vf->java_sender(); | |
588 d++; | |
589 } | |
590 return vf; | |
591 } | |
592 | |
593 | |
594 // | |
595 // utilities: JNI objects | |
596 // | |
597 | |
598 | |
599 jclass | |
600 JvmtiEnvBase::get_jni_class_non_null(klassOop k) { | |
601 assert(k != NULL, "k != NULL"); | |
602 return (jclass)jni_reference(Klass::cast(k)->java_mirror()); | |
603 } | |
604 | |
605 #ifndef JVMTI_KERNEL | |
606 | |
607 // | |
608 // Field Information | |
609 // | |
610 | |
611 bool | |
612 JvmtiEnvBase::get_field_descriptor(klassOop k, jfieldID field, fieldDescriptor* fd) { | |
613 if (!jfieldIDWorkaround::is_valid_jfieldID(k, field)) { | |
614 return false; | |
615 } | |
616 bool found = false; | |
617 if (jfieldIDWorkaround::is_static_jfieldID(field)) { | |
618 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(field); | |
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619 found = id->find_local_field(fd); |
0 | 620 } else { |
621 // Non-static field. The fieldID is really the offset of the field within the object. | |
622 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, field); | |
623 found = instanceKlass::cast(k)->find_field_from_offset(offset, false, fd); | |
624 } | |
625 return found; | |
626 } | |
627 | |
628 // | |
629 // Object Monitor Information | |
630 // | |
631 | |
632 // | |
633 // Count the number of objects for a lightweight monitor. The hobj | |
634 // parameter is object that owns the monitor so this routine will | |
635 // count the number of times the same object was locked by frames | |
636 // in java_thread. | |
637 // | |
638 jint | |
639 JvmtiEnvBase::count_locked_objects(JavaThread *java_thread, Handle hobj) { | |
640 jint ret = 0; | |
641 if (!java_thread->has_last_Java_frame()) { | |
642 return ret; // no Java frames so no monitors | |
643 } | |
644 | |
645 ResourceMark rm; | |
646 HandleMark hm; | |
647 RegisterMap reg_map(java_thread); | |
648 | |
649 for(javaVFrame *jvf=java_thread->last_java_vframe(®_map); jvf != NULL; | |
650 jvf = jvf->java_sender()) { | |
651 GrowableArray<MonitorInfo*>* mons = jvf->monitors(); | |
652 if (!mons->is_empty()) { | |
653 for (int i = 0; i < mons->length(); i++) { | |
654 MonitorInfo *mi = mons->at(i); | |
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655 if (mi->owner_is_scalar_replaced()) continue; |
0 | 656 |
657 // see if owner of the monitor is our object | |
658 if (mi->owner() != NULL && mi->owner() == hobj()) { | |
659 ret++; | |
660 } | |
661 } | |
662 } | |
663 } | |
664 return ret; | |
665 } | |
666 | |
667 | |
668 | |
669 jvmtiError | |
670 JvmtiEnvBase::get_current_contended_monitor(JavaThread *calling_thread, JavaThread *java_thread, jobject *monitor_ptr) { | |
671 #ifdef ASSERT | |
672 uint32_t debug_bits = 0; | |
673 #endif | |
674 assert((SafepointSynchronize::is_at_safepoint() || | |
675 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
676 "at safepoint or target thread is suspended"); | |
677 oop obj = NULL; | |
678 ObjectMonitor *mon = java_thread->current_waiting_monitor(); | |
679 if (mon == NULL) { | |
680 // thread is not doing an Object.wait() call | |
681 mon = java_thread->current_pending_monitor(); | |
682 if (mon != NULL) { | |
683 // The thread is trying to enter() or raw_enter() an ObjectMonitor. | |
684 obj = (oop)mon->object(); | |
685 // If obj == NULL, then ObjectMonitor is raw which doesn't count | |
686 // as contended for this API | |
687 } | |
688 // implied else: no contended ObjectMonitor | |
689 } else { | |
690 // thread is doing an Object.wait() call | |
691 obj = (oop)mon->object(); | |
692 assert(obj != NULL, "Object.wait() should have an object"); | |
693 } | |
694 | |
695 if (obj == NULL) { | |
696 *monitor_ptr = NULL; | |
697 } else { | |
698 HandleMark hm; | |
699 Handle hobj(obj); | |
700 *monitor_ptr = jni_reference(calling_thread, hobj); | |
701 } | |
702 return JVMTI_ERROR_NONE; | |
703 } | |
704 | |
705 | |
706 jvmtiError | |
707 JvmtiEnvBase::get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread, | |
708 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list) { | |
709 jvmtiError err = JVMTI_ERROR_NONE; | |
710 #ifdef ASSERT | |
711 uint32_t debug_bits = 0; | |
712 #endif | |
713 assert((SafepointSynchronize::is_at_safepoint() || | |
714 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
715 "at safepoint or target thread is suspended"); | |
716 | |
717 if (java_thread->has_last_Java_frame()) { | |
718 ResourceMark rm; | |
719 HandleMark hm; | |
720 RegisterMap reg_map(java_thread); | |
721 | |
722 int depth = 0; | |
723 for (javaVFrame *jvf = java_thread->last_java_vframe(®_map); jvf != NULL; | |
724 jvf = jvf->java_sender()) { | |
725 if (depth++ < MaxJavaStackTraceDepth) { // check for stack too deep | |
726 // add locked objects for this frame into list | |
727 err = get_locked_objects_in_frame(calling_thread, java_thread, jvf, owned_monitors_list, depth-1); | |
728 if (err != JVMTI_ERROR_NONE) { | |
729 return err; | |
730 } | |
731 } | |
732 } | |
733 } | |
734 | |
735 // Get off stack monitors. (e.g. acquired via jni MonitorEnter). | |
736 JvmtiMonitorClosure jmc(java_thread, calling_thread, owned_monitors_list, this); | |
737 ObjectSynchronizer::monitors_iterate(&jmc); | |
738 err = jmc.error(); | |
739 | |
740 return err; | |
741 } | |
742 | |
743 // Save JNI local handles for any objects that this frame owns. | |
744 jvmtiError | |
745 JvmtiEnvBase::get_locked_objects_in_frame(JavaThread* calling_thread, JavaThread* java_thread, | |
746 javaVFrame *jvf, GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, int stack_depth) { | |
747 jvmtiError err = JVMTI_ERROR_NONE; | |
748 ResourceMark rm; | |
749 | |
750 GrowableArray<MonitorInfo*>* mons = jvf->monitors(); | |
751 if (mons->is_empty()) { | |
752 return err; // this javaVFrame holds no monitors | |
753 } | |
754 | |
755 HandleMark hm; | |
756 oop wait_obj = NULL; | |
757 { | |
758 // save object of current wait() call (if any) for later comparison | |
759 ObjectMonitor *mon = java_thread->current_waiting_monitor(); | |
760 if (mon != NULL) { | |
761 wait_obj = (oop)mon->object(); | |
762 } | |
763 } | |
764 oop pending_obj = NULL; | |
765 { | |
766 // save object of current enter() call (if any) for later comparison | |
767 ObjectMonitor *mon = java_thread->current_pending_monitor(); | |
768 if (mon != NULL) { | |
769 pending_obj = (oop)mon->object(); | |
770 } | |
771 } | |
772 | |
773 for (int i = 0; i < mons->length(); i++) { | |
774 MonitorInfo *mi = mons->at(i); | |
775 | |
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776 if (mi->owner_is_scalar_replaced()) continue; |
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777 |
0 | 778 oop obj = mi->owner(); |
779 if (obj == NULL) { | |
780 // this monitor doesn't have an owning object so skip it | |
781 continue; | |
782 } | |
783 | |
784 if (wait_obj == obj) { | |
785 // the thread is waiting on this monitor so it isn't really owned | |
786 continue; | |
787 } | |
788 | |
789 if (pending_obj == obj) { | |
790 // the thread is pending on this monitor so it isn't really owned | |
791 continue; | |
792 } | |
793 | |
794 if (owned_monitors_list->length() > 0) { | |
795 // Our list has at least one object on it so we have to check | |
796 // for recursive object locking | |
797 bool found = false; | |
798 for (int j = 0; j < owned_monitors_list->length(); j++) { | |
799 jobject jobj = ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(j))->monitor; | |
800 oop check = JNIHandles::resolve(jobj); | |
801 if (check == obj) { | |
802 found = true; // we found the object | |
803 break; | |
804 } | |
805 } | |
806 | |
807 if (found) { | |
808 // already have this object so don't include it | |
809 continue; | |
810 } | |
811 } | |
812 | |
813 // add the owning object to our list | |
814 jvmtiMonitorStackDepthInfo *jmsdi; | |
815 err = allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); | |
816 if (err != JVMTI_ERROR_NONE) { | |
817 return err; | |
818 } | |
819 Handle hobj(obj); | |
820 jmsdi->monitor = jni_reference(calling_thread, hobj); | |
821 jmsdi->stack_depth = stack_depth; | |
822 owned_monitors_list->append(jmsdi); | |
823 } | |
824 | |
825 return err; | |
826 } | |
827 | |
828 jvmtiError | |
829 JvmtiEnvBase::get_stack_trace(JavaThread *java_thread, | |
830 jint start_depth, jint max_count, | |
831 jvmtiFrameInfo* frame_buffer, jint* count_ptr) { | |
832 #ifdef ASSERT | |
833 uint32_t debug_bits = 0; | |
834 #endif | |
835 assert((SafepointSynchronize::is_at_safepoint() || | |
836 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
837 "at safepoint or target thread is suspended"); | |
838 int count = 0; | |
839 if (java_thread->has_last_Java_frame()) { | |
840 RegisterMap reg_map(java_thread); | |
841 Thread* current_thread = Thread::current(); | |
842 ResourceMark rm(current_thread); | |
843 javaVFrame *jvf = java_thread->last_java_vframe(®_map); | |
844 HandleMark hm(current_thread); | |
845 if (start_depth != 0) { | |
846 if (start_depth > 0) { | |
847 for (int j = 0; j < start_depth && jvf != NULL; j++) { | |
848 jvf = jvf->java_sender(); | |
849 } | |
850 if (jvf == NULL) { | |
851 // start_depth is deeper than the stack depth | |
852 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
853 } | |
854 } else { // start_depth < 0 | |
855 // we are referencing the starting depth based on the oldest | |
856 // part of the stack. | |
857 // optimize to limit the number of times that java_sender() is called | |
858 javaVFrame *jvf_cursor = jvf; | |
859 javaVFrame *jvf_prev = NULL; | |
860 javaVFrame *jvf_prev_prev; | |
861 int j = 0; | |
862 while (jvf_cursor != NULL) { | |
863 jvf_prev_prev = jvf_prev; | |
864 jvf_prev = jvf_cursor; | |
865 for (j = 0; j > start_depth && jvf_cursor != NULL; j--) { | |
866 jvf_cursor = jvf_cursor->java_sender(); | |
867 } | |
868 } | |
869 if (j == start_depth) { | |
870 // previous pointer is exactly where we want to start | |
871 jvf = jvf_prev; | |
872 } else { | |
873 // we need to back up further to get to the right place | |
874 if (jvf_prev_prev == NULL) { | |
875 // the -start_depth is greater than the stack depth | |
876 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
877 } | |
878 // j now is the number of frames on the stack starting with | |
879 // jvf_prev, we start from jvf_prev_prev and move older on | |
880 // the stack that many, the result is -start_depth frames | |
881 // remaining. | |
882 jvf = jvf_prev_prev; | |
883 for (; j < 0; j++) { | |
884 jvf = jvf->java_sender(); | |
885 } | |
886 } | |
887 } | |
888 } | |
889 for (; count < max_count && jvf != NULL; count++) { | |
890 frame_buffer[count].method = jvf->method()->jmethod_id(); | |
891 frame_buffer[count].location = (jvf->method()->is_native() ? -1 : jvf->bci()); | |
892 jvf = jvf->java_sender(); | |
893 } | |
894 } else { | |
895 if (start_depth != 0) { | |
896 // no frames and there is a starting depth | |
897 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
898 } | |
899 } | |
900 *count_ptr = count; | |
901 return JVMTI_ERROR_NONE; | |
902 } | |
903 | |
904 jvmtiError | |
905 JvmtiEnvBase::get_frame_count(JvmtiThreadState *state, jint *count_ptr) { | |
906 assert((state != NULL), | |
907 "JavaThread should create JvmtiThreadState before calling this method"); | |
908 *count_ptr = state->count_frames(); | |
909 return JVMTI_ERROR_NONE; | |
910 } | |
911 | |
912 jvmtiError | |
913 JvmtiEnvBase::get_frame_location(JavaThread *java_thread, jint depth, | |
914 jmethodID* method_ptr, jlocation* location_ptr) { | |
915 #ifdef ASSERT | |
916 uint32_t debug_bits = 0; | |
917 #endif | |
918 assert((SafepointSynchronize::is_at_safepoint() || | |
919 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
920 "at safepoint or target thread is suspended"); | |
921 Thread* current_thread = Thread::current(); | |
922 ResourceMark rm(current_thread); | |
923 | |
924 vframe *vf = vframeFor(java_thread, depth); | |
925 if (vf == NULL) { | |
926 return JVMTI_ERROR_NO_MORE_FRAMES; | |
927 } | |
928 | |
929 // vframeFor should return a java frame. If it doesn't | |
930 // it means we've got an internal error and we return the | |
931 // error in product mode. In debug mode we will instead | |
932 // attempt to cast the vframe to a javaVFrame and will | |
933 // cause an assertion/crash to allow further diagnosis. | |
934 #ifdef PRODUCT | |
935 if (!vf->is_java_frame()) { | |
936 return JVMTI_ERROR_INTERNAL; | |
937 } | |
938 #endif | |
939 | |
940 HandleMark hm(current_thread); | |
941 javaVFrame *jvf = javaVFrame::cast(vf); | |
942 methodOop method = jvf->method(); | |
943 if (method->is_native()) { | |
944 *location_ptr = -1; | |
945 } else { | |
946 *location_ptr = jvf->bci(); | |
947 } | |
948 *method_ptr = method->jmethod_id(); | |
949 | |
950 return JVMTI_ERROR_NONE; | |
951 } | |
952 | |
953 | |
954 jvmtiError | |
955 JvmtiEnvBase::get_object_monitor_usage(JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) { | |
956 HandleMark hm; | |
957 Handle hobj; | |
958 | |
959 bool at_safepoint = SafepointSynchronize::is_at_safepoint(); | |
960 | |
961 // Check arguments | |
962 { | |
963 oop mirror = JNIHandles::resolve_external_guard(object); | |
964 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT); | |
965 NULL_CHECK(info_ptr, JVMTI_ERROR_NULL_POINTER); | |
966 | |
967 hobj = Handle(mirror); | |
968 } | |
969 | |
970 JavaThread *owning_thread = NULL; | |
971 ObjectMonitor *mon = NULL; | |
972 jvmtiMonitorUsage ret = { | |
973 NULL, 0, 0, NULL, 0, NULL | |
974 }; | |
975 | |
976 uint32_t debug_bits = 0; | |
977 // first derive the object's owner and entry_count (if any) | |
978 { | |
979 // Revoke any biases before querying the mark word | |
980 if (SafepointSynchronize::is_at_safepoint()) { | |
981 BiasedLocking::revoke_at_safepoint(hobj); | |
982 } else { | |
983 BiasedLocking::revoke_and_rebias(hobj, false, calling_thread); | |
984 } | |
985 | |
986 address owner = NULL; | |
987 { | |
988 markOop mark = hobj()->mark(); | |
989 | |
990 if (!mark->has_monitor()) { | |
991 // this object has a lightweight monitor | |
992 | |
993 if (mark->has_locker()) { | |
994 owner = (address)mark->locker(); // save the address of the Lock word | |
995 } | |
996 // implied else: no owner | |
997 } else { | |
998 // this object has a heavyweight monitor | |
999 mon = mark->monitor(); | |
1000 | |
1001 // The owner field of a heavyweight monitor may be NULL for no | |
1002 // owner, a JavaThread * or it may still be the address of the | |
1003 // Lock word in a JavaThread's stack. A monitor can be inflated | |
1004 // by a non-owning JavaThread, but only the owning JavaThread | |
1005 // can change the owner field from the Lock word to the | |
1006 // JavaThread * and it may not have done that yet. | |
1007 owner = (address)mon->owner(); | |
1008 } | |
1009 } | |
1010 | |
1011 if (owner != NULL) { | |
1012 // This monitor is owned so we have to find the owning JavaThread. | |
1013 // Since owning_thread_from_monitor_owner() grabs a lock, GC can | |
1014 // move our object at this point. However, our owner value is safe | |
1015 // since it is either the Lock word on a stack or a JavaThread *. | |
1016 owning_thread = Threads::owning_thread_from_monitor_owner(owner, !at_safepoint); | |
1017 assert(owning_thread != NULL, "sanity check"); | |
1018 if (owning_thread != NULL) { // robustness | |
1019 // The monitor's owner either has to be the current thread, at safepoint | |
1020 // or it has to be suspended. Any of these conditions will prevent both | |
1021 // contending and waiting threads from modifying the state of | |
1022 // the monitor. | |
1023 if (!at_safepoint && !JvmtiEnv::is_thread_fully_suspended(owning_thread, true, &debug_bits)) { | |
1024 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
1025 } | |
1026 HandleMark hm; | |
1027 Handle th(owning_thread->threadObj()); | |
1028 ret.owner = (jthread)jni_reference(calling_thread, th); | |
1029 } | |
1030 // implied else: no owner | |
1031 } | |
1032 | |
1033 if (owning_thread != NULL) { // monitor is owned | |
1034 if ((address)owning_thread == owner) { | |
1035 // the owner field is the JavaThread * | |
1036 assert(mon != NULL, | |
1037 "must have heavyweight monitor with JavaThread * owner"); | |
1038 ret.entry_count = mon->recursions() + 1; | |
1039 } else { | |
1040 // The owner field is the Lock word on the JavaThread's stack | |
1041 // so the recursions field is not valid. We have to count the | |
1042 // number of recursive monitor entries the hard way. We pass | |
1043 // a handle to survive any GCs along the way. | |
1044 ResourceMark rm; | |
1045 ret.entry_count = count_locked_objects(owning_thread, hobj); | |
1046 } | |
1047 } | |
1048 // implied else: entry_count == 0 | |
1049 } | |
1050 | |
1051 int nWant,nWait; | |
1052 if (mon != NULL) { | |
1053 // this object has a heavyweight monitor | |
1054 nWant = mon->contentions(); // # of threads contending for monitor | |
1055 nWait = mon->waiters(); // # of threads in Object.wait() | |
1056 ret.waiter_count = nWant + nWait; | |
1057 ret.notify_waiter_count = nWait; | |
1058 } else { | |
1059 // this object has a lightweight monitor | |
1060 ret.waiter_count = 0; | |
1061 ret.notify_waiter_count = 0; | |
1062 } | |
1063 | |
1064 // Allocate memory for heavyweight and lightweight monitor. | |
1065 jvmtiError err; | |
1066 err = allocate(ret.waiter_count * sizeof(jthread *), (unsigned char**)&ret.waiters); | |
1067 if (err != JVMTI_ERROR_NONE) { | |
1068 return err; | |
1069 } | |
1070 err = allocate(ret.notify_waiter_count * sizeof(jthread *), | |
1071 (unsigned char**)&ret.notify_waiters); | |
1072 if (err != JVMTI_ERROR_NONE) { | |
1073 deallocate((unsigned char*)ret.waiters); | |
1074 return err; | |
1075 } | |
1076 | |
1077 // now derive the rest of the fields | |
1078 if (mon != NULL) { | |
1079 // this object has a heavyweight monitor | |
1080 | |
1081 // Number of waiters may actually be less than the waiter count. | |
1082 // So NULL out memory so that unused memory will be NULL. | |
1083 memset(ret.waiters, 0, ret.waiter_count * sizeof(jthread *)); | |
1084 memset(ret.notify_waiters, 0, ret.notify_waiter_count * sizeof(jthread *)); | |
1085 | |
1086 if (ret.waiter_count > 0) { | |
1087 // we have contending and/or waiting threads | |
1088 HandleMark hm; | |
1089 if (nWant > 0) { | |
1090 // we have contending threads | |
1091 ResourceMark rm; | |
1092 // get_pending_threads returns only java thread so we do not need to | |
1093 // check for non java threads. | |
1094 GrowableArray<JavaThread*>* wantList = Threads::get_pending_threads( | |
1095 nWant, (address)mon, !at_safepoint); | |
1096 if (wantList->length() < nWant) { | |
1097 // robustness: the pending list has gotten smaller | |
1098 nWant = wantList->length(); | |
1099 } | |
1100 for (int i = 0; i < nWant; i++) { | |
1101 JavaThread *pending_thread = wantList->at(i); | |
1102 // If the monitor has no owner, then a non-suspended contending | |
1103 // thread could potentially change the state of the monitor by | |
1104 // entering it. The JVM/TI spec doesn't allow this. | |
1105 if (owning_thread == NULL && !at_safepoint & | |
1106 !JvmtiEnv::is_thread_fully_suspended(pending_thread, true, &debug_bits)) { | |
1107 if (ret.owner != NULL) { | |
1108 destroy_jni_reference(calling_thread, ret.owner); | |
1109 } | |
1110 for (int j = 0; j < i; j++) { | |
1111 destroy_jni_reference(calling_thread, ret.waiters[j]); | |
1112 } | |
1113 deallocate((unsigned char*)ret.waiters); | |
1114 deallocate((unsigned char*)ret.notify_waiters); | |
1115 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
1116 } | |
1117 Handle th(pending_thread->threadObj()); | |
1118 ret.waiters[i] = (jthread)jni_reference(calling_thread, th); | |
1119 } | |
1120 } | |
1121 if (nWait > 0) { | |
1122 // we have threads in Object.wait() | |
1123 int offset = nWant; // add after any contending threads | |
1124 ObjectWaiter *waiter = mon->first_waiter(); | |
1125 for (int i = 0, j = 0; i < nWait; i++) { | |
1126 if (waiter == NULL) { | |
1127 // robustness: the waiting list has gotten smaller | |
1128 nWait = j; | |
1129 break; | |
1130 } | |
1131 Thread *t = mon->thread_of_waiter(waiter); | |
1132 if (t != NULL && t->is_Java_thread()) { | |
1133 JavaThread *wjava_thread = (JavaThread *)t; | |
1134 // If the thread was found on the ObjectWaiter list, then | |
1135 // it has not been notified. This thread can't change the | |
1136 // state of the monitor so it doesn't need to be suspended. | |
1137 Handle th(wjava_thread->threadObj()); | |
1138 ret.waiters[offset + j] = (jthread)jni_reference(calling_thread, th); | |
1139 ret.notify_waiters[j++] = (jthread)jni_reference(calling_thread, th); | |
1140 } | |
1141 waiter = mon->next_waiter(waiter); | |
1142 } | |
1143 } | |
1144 } | |
1145 | |
1146 // Adjust count. nWant and nWait count values may be less than original. | |
1147 ret.waiter_count = nWant + nWait; | |
1148 ret.notify_waiter_count = nWait; | |
1149 } else { | |
1150 // this object has a lightweight monitor and we have nothing more | |
1151 // to do here because the defaults are just fine. | |
1152 } | |
1153 | |
1154 // we don't update return parameter unless everything worked | |
1155 *info_ptr = ret; | |
1156 | |
1157 return JVMTI_ERROR_NONE; | |
1158 } | |
1159 | |
1160 ResourceTracker::ResourceTracker(JvmtiEnv* env) { | |
1161 _env = env; | |
1162 _allocations = new (ResourceObj::C_HEAP) GrowableArray<unsigned char*>(20, true); | |
1163 _failed = false; | |
1164 } | |
1165 ResourceTracker::~ResourceTracker() { | |
1166 if (_failed) { | |
1167 for (int i=0; i<_allocations->length(); i++) { | |
1168 _env->deallocate(_allocations->at(i)); | |
1169 } | |
1170 } | |
1171 delete _allocations; | |
1172 } | |
1173 | |
1174 jvmtiError ResourceTracker::allocate(jlong size, unsigned char** mem_ptr) { | |
1175 unsigned char *ptr; | |
1176 jvmtiError err = _env->allocate(size, &ptr); | |
1177 if (err == JVMTI_ERROR_NONE) { | |
1178 _allocations->append(ptr); | |
1179 *mem_ptr = ptr; | |
1180 } else { | |
1181 *mem_ptr = NULL; | |
1182 _failed = true; | |
1183 } | |
1184 return err; | |
1185 } | |
1186 | |
1187 unsigned char* ResourceTracker::allocate(jlong size) { | |
1188 unsigned char* ptr; | |
1189 allocate(size, &ptr); | |
1190 return ptr; | |
1191 } | |
1192 | |
1193 char* ResourceTracker::strdup(const char* str) { | |
1194 char *dup_str = (char*)allocate(strlen(str)+1); | |
1195 if (dup_str != NULL) { | |
1196 strcpy(dup_str, str); | |
1197 } | |
1198 return dup_str; | |
1199 } | |
1200 | |
1201 struct StackInfoNode { | |
1202 struct StackInfoNode *next; | |
1203 jvmtiStackInfo info; | |
1204 }; | |
1205 | |
1206 // Create a jvmtiStackInfo inside a linked list node and create a | |
1207 // buffer for the frame information, both allocated as resource objects. | |
1208 // Fill in both the jvmtiStackInfo and the jvmtiFrameInfo. | |
1209 // Note that either or both of thr and thread_oop | |
1210 // may be null if the thread is new or has exited. | |
1211 void | |
1212 VM_GetMultipleStackTraces::fill_frames(jthread jt, JavaThread *thr, oop thread_oop) { | |
1213 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1214 | |
1215 jint state = 0; | |
1216 struct StackInfoNode *node = NEW_RESOURCE_OBJ(struct StackInfoNode); | |
1217 jvmtiStackInfo *infop = &(node->info); | |
1218 node->next = head(); | |
1219 set_head(node); | |
1220 infop->frame_count = 0; | |
1221 infop->thread = jt; | |
1222 | |
1223 if (thread_oop != NULL) { | |
1224 // get most state bits | |
1225 state = (jint)java_lang_Thread::get_thread_status(thread_oop); | |
1226 } | |
1227 | |
1228 if (thr != NULL) { // add more state bits if there is a JavaThead to query | |
1229 // same as is_being_ext_suspended() but without locking | |
1230 if (thr->is_ext_suspended() || thr->is_external_suspend()) { | |
1231 state |= JVMTI_THREAD_STATE_SUSPENDED; | |
1232 } | |
1233 JavaThreadState jts = thr->thread_state(); | |
1234 if (jts == _thread_in_native) { | |
1235 state |= JVMTI_THREAD_STATE_IN_NATIVE; | |
1236 } | |
1237 OSThread* osThread = thr->osthread(); | |
1238 if (osThread != NULL && osThread->interrupted()) { | |
1239 state |= JVMTI_THREAD_STATE_INTERRUPTED; | |
1240 } | |
1241 } | |
1242 infop->state = state; | |
1243 | |
1244 if (thr != NULL || (state & JVMTI_THREAD_STATE_ALIVE) != 0) { | |
1245 infop->frame_buffer = NEW_RESOURCE_ARRAY(jvmtiFrameInfo, max_frame_count()); | |
1246 env()->get_stack_trace(thr, 0, max_frame_count(), | |
1247 infop->frame_buffer, &(infop->frame_count)); | |
1248 } else { | |
1249 infop->frame_buffer = NULL; | |
1250 infop->frame_count = 0; | |
1251 } | |
1252 _frame_count_total += infop->frame_count; | |
1253 } | |
1254 | |
1255 // Based on the stack information in the linked list, allocate memory | |
1256 // block to return and fill it from the info in the linked list. | |
1257 void | |
1258 VM_GetMultipleStackTraces::allocate_and_fill_stacks(jint thread_count) { | |
1259 // do I need to worry about alignment issues? | |
1260 jlong alloc_size = thread_count * sizeof(jvmtiStackInfo) | |
1261 + _frame_count_total * sizeof(jvmtiFrameInfo); | |
1262 env()->allocate(alloc_size, (unsigned char **)&_stack_info); | |
1263 | |
1264 // pointers to move through the newly allocated space as it is filled in | |
1265 jvmtiStackInfo *si = _stack_info + thread_count; // bottom of stack info | |
1266 jvmtiFrameInfo *fi = (jvmtiFrameInfo *)si; // is the top of frame info | |
1267 | |
1268 // copy information in resource area into allocated buffer | |
1269 // insert stack info backwards since linked list is backwards | |
1270 // insert frame info forwards | |
1271 // walk the StackInfoNodes | |
1272 for (struct StackInfoNode *sin = head(); sin != NULL; sin = sin->next) { | |
1273 jint frame_count = sin->info.frame_count; | |
1274 size_t frames_size = frame_count * sizeof(jvmtiFrameInfo); | |
1275 --si; | |
1276 memcpy(si, &(sin->info), sizeof(jvmtiStackInfo)); | |
1277 if (frames_size == 0) { | |
1278 si->frame_buffer = NULL; | |
1279 } else { | |
1280 memcpy(fi, sin->info.frame_buffer, frames_size); | |
1281 si->frame_buffer = fi; // point to the new allocated copy of the frames | |
1282 fi += frame_count; | |
1283 } | |
1284 } | |
1285 assert(si == _stack_info, "the last copied stack info must be the first record"); | |
1286 assert((unsigned char *)fi == ((unsigned char *)_stack_info) + alloc_size, | |
1287 "the last copied frame info must be the last record"); | |
1288 } | |
1289 | |
1290 | |
1291 void | |
1292 VM_GetThreadListStackTraces::doit() { | |
1293 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1294 | |
1295 ResourceMark rm; | |
1296 for (int i = 0; i < _thread_count; ++i) { | |
1297 jthread jt = _thread_list[i]; | |
1298 oop thread_oop = JNIHandles::resolve_external_guard(jt); | |
1142 | 1299 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) { |
0 | 1300 set_result(JVMTI_ERROR_INVALID_THREAD); |
1301 return; | |
1302 } | |
1303 fill_frames(jt, java_lang_Thread::thread(thread_oop), thread_oop); | |
1304 } | |
1305 allocate_and_fill_stacks(_thread_count); | |
1306 } | |
1307 | |
1308 void | |
1309 VM_GetAllStackTraces::doit() { | |
1310 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1311 | |
1312 ResourceMark rm; | |
1313 _final_thread_count = 0; | |
1314 for (JavaThread *jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
1315 oop thread_oop = jt->threadObj(); | |
1316 if (thread_oop != NULL && | |
1317 !jt->is_exiting() && | |
1318 java_lang_Thread::is_alive(thread_oop) && | |
1319 !jt->is_hidden_from_external_view()) { | |
1320 ++_final_thread_count; | |
1321 // Handle block of the calling thread is used to create local refs. | |
1322 fill_frames((jthread)JNIHandles::make_local(_calling_thread, thread_oop), | |
1323 jt, thread_oop); | |
1324 } | |
1325 } | |
1326 allocate_and_fill_stacks(_final_thread_count); | |
1327 } | |
1328 | |
1329 // Verifies that the top frame is a java frame in an expected state. | |
1330 // Deoptimizes frame if needed. | |
1331 // Checks that the frame method signature matches the return type (tos). | |
1332 // HandleMark must be defined in the caller only. | |
1333 // It is to keep a ret_ob_h handle alive after return to the caller. | |
1334 jvmtiError | |
1335 JvmtiEnvBase::check_top_frame(JavaThread* current_thread, JavaThread* java_thread, | |
1336 jvalue value, TosState tos, Handle* ret_ob_h) { | |
1337 ResourceMark rm(current_thread); | |
1338 | |
1339 vframe *vf = vframeFor(java_thread, 0); | |
1340 NULL_CHECK(vf, JVMTI_ERROR_NO_MORE_FRAMES); | |
1341 | |
1342 javaVFrame *jvf = (javaVFrame*) vf; | |
1343 if (!vf->is_java_frame() || jvf->method()->is_native()) { | |
1344 return JVMTI_ERROR_OPAQUE_FRAME; | |
1345 } | |
1346 | |
1347 // If the frame is a compiled one, need to deoptimize it. | |
1348 if (vf->is_compiled_frame()) { | |
1349 if (!vf->fr().can_be_deoptimized()) { | |
1350 return JVMTI_ERROR_OPAQUE_FRAME; | |
1351 } | |
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1352 Deoptimization::deoptimize_frame(java_thread, jvf->fr().id()); |
0 | 1353 } |
1354 | |
1355 // Get information about method return type | |
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1356 Symbol* signature = jvf->method()->signature(); |
0 | 1357 |
1358 ResultTypeFinder rtf(signature); | |
1359 TosState fr_tos = as_TosState(rtf.type()); | |
1360 if (fr_tos != tos) { | |
1361 if (tos != itos || (fr_tos != btos && fr_tos != ctos && fr_tos != stos)) { | |
1362 return JVMTI_ERROR_TYPE_MISMATCH; | |
1363 } | |
1364 } | |
1365 | |
1366 // Check that the jobject class matches the return type signature. | |
1367 jobject jobj = value.l; | |
1368 if (tos == atos && jobj != NULL) { // NULL reference is allowed | |
1369 Handle ob_h = Handle(current_thread, JNIHandles::resolve_external_guard(jobj)); | |
1370 NULL_CHECK(ob_h, JVMTI_ERROR_INVALID_OBJECT); | |
1371 KlassHandle ob_kh = KlassHandle(current_thread, ob_h()->klass()); | |
1372 NULL_CHECK(ob_kh, JVMTI_ERROR_INVALID_OBJECT); | |
1373 | |
1374 // Method return type signature. | |
1375 char* ty_sign = 1 + strchr(signature->as_C_string(), ')'); | |
1376 | |
1377 if (!VM_GetOrSetLocal::is_assignable(ty_sign, Klass::cast(ob_kh()), current_thread)) { | |
1378 return JVMTI_ERROR_TYPE_MISMATCH; | |
1379 } | |
1380 *ret_ob_h = ob_h; | |
1381 } | |
1382 return JVMTI_ERROR_NONE; | |
1383 } /* end check_top_frame */ | |
1384 | |
1385 | |
1386 // ForceEarlyReturn<type> follows the PopFrame approach in many aspects. | |
1387 // Main difference is on the last stage in the interpreter. | |
1388 // The PopFrame stops method execution to continue execution | |
1389 // from the same method call instruction. | |
1390 // The ForceEarlyReturn forces return from method so the execution | |
1391 // continues at the bytecode following the method call. | |
1392 | |
1393 // Threads_lock NOT held, java_thread not protected by lock | |
1394 // java_thread - pre-checked | |
1395 | |
1396 jvmtiError | |
1397 JvmtiEnvBase::force_early_return(JavaThread* java_thread, jvalue value, TosState tos) { | |
1398 JavaThread* current_thread = JavaThread::current(); | |
1399 HandleMark hm(current_thread); | |
1400 uint32_t debug_bits = 0; | |
1401 | |
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1402 // retrieve or create the state |
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1403 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); |
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1404 if (state == NULL) { |
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1405 return JVMTI_ERROR_THREAD_NOT_ALIVE; |
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1406 } |
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1407 |
0 | 1408 // Check if java_thread is fully suspended |
1409 if (!is_thread_fully_suspended(java_thread, | |
1410 true /* wait for suspend completion */, | |
1411 &debug_bits)) { | |
1412 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
1413 } | |
1414 | |
1415 // Check to see if a ForceEarlyReturn was already in progress | |
1416 if (state->is_earlyret_pending()) { | |
1417 // Probably possible for JVMTI clients to trigger this, but the | |
1418 // JPDA backend shouldn't allow this to happen | |
1419 return JVMTI_ERROR_INTERNAL; | |
1420 } | |
1421 { | |
1422 // The same as for PopFrame. Workaround bug: | |
1423 // 4812902: popFrame hangs if the method is waiting at a synchronize | |
1424 // Catch this condition and return an error to avoid hanging. | |
1425 // Now JVMTI spec allows an implementation to bail out with an opaque | |
1426 // frame error. | |
1427 OSThread* osThread = java_thread->osthread(); | |
1428 if (osThread->get_state() == MONITOR_WAIT) { | |
1429 return JVMTI_ERROR_OPAQUE_FRAME; | |
1430 } | |
1431 } | |
1432 Handle ret_ob_h = Handle(); | |
1433 jvmtiError err = check_top_frame(current_thread, java_thread, value, tos, &ret_ob_h); | |
1434 if (err != JVMTI_ERROR_NONE) { | |
1435 return err; | |
1436 } | |
1437 assert(tos != atos || value.l == NULL || ret_ob_h() != NULL, | |
1438 "return object oop must not be NULL if jobject is not NULL"); | |
1439 | |
1440 // Update the thread state to reflect that the top frame must be | |
1441 // forced to return. | |
1442 // The current frame will be returned later when the suspended | |
1443 // thread is resumed and right before returning from VM to Java. | |
1444 // (see call_VM_base() in assembler_<cpu>.cpp). | |
1445 | |
1446 state->set_earlyret_pending(); | |
1447 state->set_earlyret_oop(ret_ob_h()); | |
1448 state->set_earlyret_value(value, tos); | |
1449 | |
1450 // Set pending step flag for this early return. | |
1451 // It is cleared when next step event is posted. | |
1452 state->set_pending_step_for_earlyret(); | |
1453 | |
1454 return JVMTI_ERROR_NONE; | |
1455 } /* end force_early_return */ | |
1456 | |
1457 void | |
1458 JvmtiMonitorClosure::do_monitor(ObjectMonitor* mon) { | |
1459 if ( _error != JVMTI_ERROR_NONE) { | |
1460 // Error occurred in previous iteration so no need to add | |
1461 // to the list. | |
1462 return; | |
1463 } | |
1464 if (mon->owner() == _java_thread ) { | |
1465 // Filter out on stack monitors collected during stack walk. | |
1466 oop obj = (oop)mon->object(); | |
1467 bool found = false; | |
1468 for (int j = 0; j < _owned_monitors_list->length(); j++) { | |
1469 jobject jobj = ((jvmtiMonitorStackDepthInfo*)_owned_monitors_list->at(j))->monitor; | |
1470 oop check = JNIHandles::resolve(jobj); | |
1471 if (check == obj) { | |
1472 // On stack monitor already collected during the stack walk. | |
1473 found = true; | |
1474 break; | |
1475 } | |
1476 } | |
1477 if (found == false) { | |
1478 // This is off stack monitor (e.g. acquired via jni MonitorEnter). | |
1479 jvmtiError err; | |
1480 jvmtiMonitorStackDepthInfo *jmsdi; | |
1481 err = _env->allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); | |
1482 if (err != JVMTI_ERROR_NONE) { | |
1483 _error = err; | |
1484 return; | |
1485 } | |
1486 Handle hobj(obj); | |
1487 jmsdi->monitor = _env->jni_reference(_calling_thread, hobj); | |
1488 // stack depth is unknown for this monitor. | |
1489 jmsdi->stack_depth = -1; | |
1490 _owned_monitors_list->append(jmsdi); | |
1491 } | |
1492 } | |
1493 } | |
1494 | |
1495 #endif // !JVMTI_KERNEL |