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annotate src/share/vm/prims/jvmtiEnvBase.cpp @ 11722:ff05c78a7f64
use time passed to decide what methods to compile or inline
author | Christian Wirth <christian.wirth@oracle.com> |
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date | Thu, 19 Sep 2013 10:36:56 +0200 |
parents | b9a918201d47 |
children | 6b2d8d20ecbd |
rev | line source |
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0 | 1 /* |
7951 | 2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #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 // register extension functions and events | |
78 JvmtiExtensions::register_extensions(); | |
79 | |
80 #ifdef JVMTI_TRACE | |
81 JvmtiTrace::initialize(); | |
82 #endif | |
83 | |
84 _globally_initialized = true; | |
85 } | |
86 | |
87 | |
88 void | |
89 JvmtiEnvBase::initialize() { | |
90 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
91 | |
92 // Add this environment to the end of the environment list (order is important) | |
93 { | |
94 // This block of code must not contain any safepoints, as list deallocation | |
95 // (which occurs at a safepoint) cannot occur simultaneously with this list | |
96 // addition. Note: No_Safepoint_Verifier cannot, currently, be used before | |
97 // threads exist. | |
98 JvmtiEnvIterator it; | |
99 JvmtiEnvBase *previous_env = NULL; | |
100 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
101 previous_env = env; | |
102 } | |
103 if (previous_env == NULL) { | |
104 _head_environment = this; | |
105 } else { | |
106 previous_env->set_next_environment(this); | |
107 } | |
108 } | |
109 | |
110 if (_globally_initialized == false) { | |
111 globally_initialize(); | |
112 } | |
113 } | |
114 | |
115 | |
611
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116 bool |
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117 JvmtiEnvBase::is_valid() { |
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118 jint value = 0; |
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119 |
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120 // This object might not be a JvmtiEnvBase so we can't assume |
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121 // the _magic field is properly aligned. Get the value in a safe |
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122 // way and then check against JVMTI_MAGIC. |
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123 |
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124 switch (sizeof(_magic)) { |
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125 case 2: |
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126 value = Bytes::get_native_u2((address)&_magic); |
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127 break; |
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128 |
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129 case 4: |
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130 value = Bytes::get_native_u4((address)&_magic); |
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131 break; |
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132 |
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133 case 8: |
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134 value = Bytes::get_native_u8((address)&_magic); |
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135 break; |
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136 |
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137 default: |
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138 guarantee(false, "_magic field is an unexpected size"); |
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139 } |
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140 |
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141 return value == JVMTI_MAGIC; |
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142 } |
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143 |
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144 |
1122 | 145 bool |
1121 | 146 JvmtiEnvBase::use_version_1_0_semantics() { |
147 int major, minor, micro; | |
148 | |
149 JvmtiExport::decode_version_values(_version, &major, &minor, µ); | |
150 return major == 1 && minor == 0; // micro version doesn't matter here | |
151 } | |
152 | |
153 | |
154 bool | |
155 JvmtiEnvBase::use_version_1_1_semantics() { | |
156 int major, minor, micro; | |
157 | |
158 JvmtiExport::decode_version_values(_version, &major, &minor, µ); | |
159 return major == 1 && minor == 1; // micro version doesn't matter here | |
160 } | |
161 | |
1988 | 162 bool |
163 JvmtiEnvBase::use_version_1_2_semantics() { | |
164 int major, minor, micro; | |
165 | |
166 JvmtiExport::decode_version_values(_version, &major, &minor, µ); | |
167 return major == 1 && minor == 2; // micro version doesn't matter here | |
168 } | |
169 | |
1121 | 170 |
171 JvmtiEnvBase::JvmtiEnvBase(jint version) : _env_event_enable() { | |
172 _version = version; | |
0 | 173 _env_local_storage = NULL; |
174 _tag_map = NULL; | |
175 _native_method_prefix_count = 0; | |
176 _native_method_prefixes = NULL; | |
177 _next = NULL; | |
178 _class_file_load_hook_ever_enabled = false; | |
179 | |
180 // Moot since ClassFileLoadHook not yet enabled. | |
181 // But "true" will give a more predictable ClassFileLoadHook behavior | |
182 // for environment creation during ClassFileLoadHook. | |
183 _is_retransformable = true; | |
184 | |
185 // all callbacks initially NULL | |
186 memset(&_event_callbacks,0,sizeof(jvmtiEventCallbacks)); | |
187 | |
188 // all capabilities initially off | |
189 memset(&_current_capabilities, 0, sizeof(_current_capabilities)); | |
190 | |
191 // all prohibited capabilities initially off | |
192 memset(&_prohibited_capabilities, 0, sizeof(_prohibited_capabilities)); | |
193 | |
194 _magic = JVMTI_MAGIC; | |
195 | |
196 JvmtiEventController::env_initialize((JvmtiEnv*)this); | |
197 | |
198 #ifdef JVMTI_TRACE | |
371 | 199 _jvmti_external.functions = TraceJVMTI != NULL ? &jvmtiTrace_Interface : &jvmti_Interface; |
0 | 200 #else |
201 _jvmti_external.functions = &jvmti_Interface; | |
202 #endif | |
203 } | |
204 | |
205 | |
206 void | |
207 JvmtiEnvBase::dispose() { | |
208 | |
209 #ifdef JVMTI_TRACE | |
210 JvmtiTrace::shutdown(); | |
211 #endif | |
212 | |
213 // Dispose of event info and let the event controller call us back | |
214 // in a locked state (env_dispose, below) | |
215 JvmtiEventController::env_dispose(this); | |
216 } | |
217 | |
218 void | |
219 JvmtiEnvBase::env_dispose() { | |
220 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
221 | |
222 // We have been entered with all events disabled on this environment. | |
223 // A race to re-enable events (by setting callbacks) is prevented by | |
224 // checking for a valid environment when setting callbacks (while | |
225 // holding the JvmtiThreadState_lock). | |
226 | |
227 // Mark as invalid. | |
228 _magic = DISPOSED_MAGIC; | |
229 | |
230 // Relinquish all capabilities. | |
231 jvmtiCapabilities *caps = get_capabilities(); | |
232 JvmtiManageCapabilities::relinquish_capabilities(caps, caps, caps); | |
233 | |
234 // Same situation as with events (see above) | |
235 set_native_method_prefixes(0, NULL); | |
236 | |
237 JvmtiTagMap* tag_map_to_deallocate = _tag_map; | |
238 set_tag_map(NULL); | |
239 // A tag map can be big, deallocate it now | |
240 if (tag_map_to_deallocate != NULL) { | |
241 delete tag_map_to_deallocate; | |
242 } | |
243 | |
244 _needs_clean_up = true; | |
245 } | |
246 | |
247 | |
248 JvmtiEnvBase::~JvmtiEnvBase() { | |
249 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
250 | |
251 // There is a small window of time during which the tag map of a | |
252 // disposed environment could have been reallocated. | |
253 // Make sure it is gone. | |
254 JvmtiTagMap* tag_map_to_deallocate = _tag_map; | |
255 set_tag_map(NULL); | |
256 // A tag map can be big, deallocate it now | |
257 if (tag_map_to_deallocate != NULL) { | |
258 delete tag_map_to_deallocate; | |
259 } | |
260 | |
261 _magic = BAD_MAGIC; | |
262 } | |
263 | |
264 | |
265 void | |
266 JvmtiEnvBase::periodic_clean_up() { | |
267 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
268 | |
269 // JvmtiEnvBase reference is saved in JvmtiEnvThreadState. So | |
270 // clean up JvmtiThreadState before deleting JvmtiEnv pointer. | |
271 JvmtiThreadState::periodic_clean_up(); | |
272 | |
273 // Unlink all invalid environments from the list of environments | |
274 // and deallocate them | |
275 JvmtiEnvIterator it; | |
276 JvmtiEnvBase* previous_env = NULL; | |
277 JvmtiEnvBase* env = it.first(); | |
278 while (env != NULL) { | |
279 if (env->is_valid()) { | |
280 previous_env = env; | |
281 env = it.next(env); | |
282 } else { | |
283 // This one isn't valid, remove it from the list and deallocate it | |
284 JvmtiEnvBase* defunct_env = env; | |
285 env = it.next(env); | |
286 if (previous_env == NULL) { | |
287 _head_environment = env; | |
288 } else { | |
289 previous_env->set_next_environment(env); | |
290 } | |
291 delete defunct_env; | |
292 } | |
293 } | |
294 | |
295 } | |
296 | |
297 | |
298 void | |
299 JvmtiEnvBase::check_for_periodic_clean_up() { | |
300 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
301 | |
302 class ThreadInsideIterationClosure: public ThreadClosure { | |
303 private: | |
304 bool _inside; | |
305 public: | |
306 ThreadInsideIterationClosure() : _inside(false) {}; | |
307 | |
308 void do_thread(Thread* thread) { | |
309 _inside |= thread->is_inside_jvmti_env_iteration(); | |
310 } | |
311 | |
312 bool is_inside_jvmti_env_iteration() { | |
313 return _inside; | |
314 } | |
315 }; | |
316 | |
317 if (_needs_clean_up) { | |
318 // Check if we are currently iterating environment, | |
319 // deallocation should not occur if we are | |
320 ThreadInsideIterationClosure tiic; | |
321 Threads::threads_do(&tiic); | |
322 if (!tiic.is_inside_jvmti_env_iteration() && | |
323 !is_inside_dying_thread_env_iteration()) { | |
324 _needs_clean_up = false; | |
325 JvmtiEnvBase::periodic_clean_up(); | |
326 } | |
327 } | |
328 } | |
329 | |
330 | |
331 void | |
332 JvmtiEnvBase::record_first_time_class_file_load_hook_enabled() { | |
333 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), | |
334 "sanity check"); | |
335 | |
336 if (!_class_file_load_hook_ever_enabled) { | |
337 _class_file_load_hook_ever_enabled = true; | |
338 | |
339 if (get_capabilities()->can_retransform_classes) { | |
340 _is_retransformable = true; | |
341 } else { | |
342 _is_retransformable = false; | |
343 | |
344 // cannot add retransform capability after ClassFileLoadHook has been enabled | |
345 get_prohibited_capabilities()->can_retransform_classes = 1; | |
346 } | |
347 } | |
348 } | |
349 | |
350 | |
351 void | |
352 JvmtiEnvBase::record_class_file_load_hook_enabled() { | |
353 if (!_class_file_load_hook_ever_enabled) { | |
354 if (Threads::number_of_threads() == 0) { | |
355 record_first_time_class_file_load_hook_enabled(); | |
356 } else { | |
357 MutexLocker mu(JvmtiThreadState_lock); | |
358 record_first_time_class_file_load_hook_enabled(); | |
359 } | |
360 } | |
361 } | |
362 | |
363 | |
364 jvmtiError | |
365 JvmtiEnvBase::set_native_method_prefixes(jint prefix_count, char** prefixes) { | |
366 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), | |
367 "sanity check"); | |
368 | |
369 int old_prefix_count = get_native_method_prefix_count(); | |
370 char **old_prefixes = get_native_method_prefixes(); | |
371 | |
372 // allocate and install the new prefixex | |
373 if (prefix_count == 0 || !is_valid()) { | |
374 _native_method_prefix_count = 0; | |
375 _native_method_prefixes = NULL; | |
376 } else { | |
377 // there are prefixes, allocate an array to hold them, and fill it | |
6197 | 378 char** new_prefixes = (char**)os::malloc((prefix_count) * sizeof(char*), mtInternal); |
0 | 379 if (new_prefixes == NULL) { |
380 return JVMTI_ERROR_OUT_OF_MEMORY; | |
381 } | |
382 for (int i = 0; i < prefix_count; i++) { | |
383 char* prefix = prefixes[i]; | |
384 if (prefix == NULL) { | |
385 for (int j = 0; j < (i-1); j++) { | |
386 os::free(new_prefixes[j]); | |
387 } | |
388 os::free(new_prefixes); | |
389 return JVMTI_ERROR_NULL_POINTER; | |
390 } | |
391 prefix = os::strdup(prefixes[i]); | |
392 if (prefix == NULL) { | |
393 for (int j = 0; j < (i-1); j++) { | |
394 os::free(new_prefixes[j]); | |
395 } | |
396 os::free(new_prefixes); | |
397 return JVMTI_ERROR_OUT_OF_MEMORY; | |
398 } | |
399 new_prefixes[i] = prefix; | |
400 } | |
401 _native_method_prefix_count = prefix_count; | |
402 _native_method_prefixes = new_prefixes; | |
403 } | |
404 | |
405 // now that we know the new prefixes have been successfully installed we can | |
406 // safely remove the old ones | |
407 if (old_prefix_count != 0) { | |
408 for (int i = 0; i < old_prefix_count; i++) { | |
409 os::free(old_prefixes[i]); | |
410 } | |
411 os::free(old_prefixes); | |
412 } | |
413 | |
414 return JVMTI_ERROR_NONE; | |
415 } | |
416 | |
417 | |
418 // Collect all the prefixes which have been set in any JVM TI environments | |
419 // by the SetNativeMethodPrefix(es) functions. Be sure to maintain the | |
420 // order of environments and the order of prefixes within each environment. | |
421 // Return in a resource allocated array. | |
422 char** | |
423 JvmtiEnvBase::get_all_native_method_prefixes(int* count_ptr) { | |
424 assert(Threads::number_of_threads() == 0 || | |
425 SafepointSynchronize::is_at_safepoint() || | |
426 JvmtiThreadState_lock->is_locked(), | |
427 "sanity check"); | |
428 | |
429 int total_count = 0; | |
430 GrowableArray<char*>* prefix_array =new GrowableArray<char*>(5); | |
431 | |
432 JvmtiEnvIterator it; | |
433 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
434 int prefix_count = env->get_native_method_prefix_count(); | |
435 char** prefixes = env->get_native_method_prefixes(); | |
436 for (int j = 0; j < prefix_count; j++) { | |
437 // retrieve a prefix and so that it is safe against asynchronous changes | |
438 // copy it into the resource area | |
439 char* prefix = prefixes[j]; | |
440 char* prefix_copy = NEW_RESOURCE_ARRAY(char, strlen(prefix)+1); | |
441 strcpy(prefix_copy, prefix); | |
442 prefix_array->at_put_grow(total_count++, prefix_copy); | |
443 } | |
444 } | |
445 | |
446 char** all_prefixes = NEW_RESOURCE_ARRAY(char*, total_count); | |
447 char** p = all_prefixes; | |
448 for (int i = 0; i < total_count; ++i) { | |
449 *p++ = prefix_array->at(i); | |
450 } | |
451 *count_ptr = total_count; | |
452 return all_prefixes; | |
453 } | |
454 | |
455 void | |
456 JvmtiEnvBase::set_event_callbacks(const jvmtiEventCallbacks* callbacks, | |
457 jint size_of_callbacks) { | |
458 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
459 | |
460 size_t byte_cnt = sizeof(jvmtiEventCallbacks); | |
461 | |
462 // clear in either case to be sure we got any gap between sizes | |
463 memset(&_event_callbacks, 0, byte_cnt); | |
464 | |
465 // Now that JvmtiThreadState_lock is held, prevent a possible race condition where events | |
466 // are re-enabled by a call to set event callbacks where the DisposeEnvironment | |
467 // occurs after the boiler-plate environment check and before the lock is acquired. | |
468 if (callbacks != NULL && is_valid()) { | |
469 if (size_of_callbacks < (jint)byte_cnt) { | |
470 byte_cnt = size_of_callbacks; | |
471 } | |
472 memcpy(&_event_callbacks, callbacks, byte_cnt); | |
473 } | |
474 } | |
475 | |
476 // Called from JVMTI entry points which perform stack walking. If the | |
477 // associated JavaThread is the current thread, then wait_for_suspend | |
478 // is not used. Otherwise, it determines if we should wait for the | |
479 // "other" thread to complete external suspension. (NOTE: in future | |
480 // releases the suspension mechanism should be reimplemented so this | |
481 // is not necessary.) | |
482 // | |
483 bool | |
484 JvmtiEnvBase::is_thread_fully_suspended(JavaThread* thr, bool wait_for_suspend, uint32_t *bits) { | |
485 // "other" threads require special handling | |
486 if (thr != JavaThread::current()) { | |
487 if (wait_for_suspend) { | |
488 // We are allowed to wait for the external suspend to complete | |
489 // so give the other thread a chance to get suspended. | |
490 if (!thr->wait_for_ext_suspend_completion(SuspendRetryCount, | |
491 SuspendRetryDelay, bits)) { | |
492 // didn't make it so let the caller know | |
493 return false; | |
494 } | |
495 } | |
496 // We aren't allowed to wait for the external suspend to complete | |
497 // so if the other thread isn't externally suspended we need to | |
498 // let the caller know. | |
499 else if (!thr->is_ext_suspend_completed_with_lock(bits)) { | |
500 return false; | |
501 } | |
502 } | |
503 | |
504 return true; | |
505 } | |
506 | |
507 | |
508 // In the fullness of time, all users of the method should instead | |
509 // directly use allocate, besides being cleaner and faster, this will | |
510 // mean much better out of memory handling | |
511 unsigned char * | |
512 JvmtiEnvBase::jvmtiMalloc(jlong size) { | |
513 unsigned char* mem; | |
514 jvmtiError result = allocate(size, &mem); | |
515 assert(result == JVMTI_ERROR_NONE, "Allocate failed"); | |
516 return mem; | |
517 } | |
518 | |
519 | |
520 // | |
521 // Threads | |
522 // | |
523 | |
524 jobject * | |
525 JvmtiEnvBase::new_jobjectArray(int length, Handle *handles) { | |
526 if (length == 0) { | |
527 return NULL; | |
528 } | |
529 | |
530 jobject *objArray = (jobject *) jvmtiMalloc(sizeof(jobject) * length); | |
531 NULL_CHECK(objArray, NULL); | |
532 | |
533 for (int i=0; i<length; i++) { | |
534 objArray[i] = jni_reference(handles[i]); | |
535 } | |
536 return objArray; | |
537 } | |
538 | |
539 jthread * | |
540 JvmtiEnvBase::new_jthreadArray(int length, Handle *handles) { | |
541 return (jthread *) new_jobjectArray(length,handles); | |
542 } | |
543 | |
544 jthreadGroup * | |
545 JvmtiEnvBase::new_jthreadGroupArray(int length, Handle *handles) { | |
546 return (jthreadGroup *) new_jobjectArray(length,handles); | |
547 } | |
548 | |
549 | |
550 JavaThread * | |
551 JvmtiEnvBase::get_JavaThread(jthread jni_thread) { | |
552 oop t = JNIHandles::resolve_external_guard(jni_thread); | |
1142 | 553 if (t == NULL || !t->is_a(SystemDictionary::Thread_klass())) { |
0 | 554 return NULL; |
555 } | |
556 // The following returns NULL if the thread has not yet run or is in | |
557 // process of exiting | |
558 return java_lang_Thread::thread(t); | |
559 } | |
560 | |
561 | |
562 // return the vframe on the specified thread and depth, NULL if no such frame | |
563 vframe* | |
564 JvmtiEnvBase::vframeFor(JavaThread* java_thread, jint depth) { | |
565 if (!java_thread->has_last_Java_frame()) { | |
566 return NULL; | |
567 } | |
568 RegisterMap reg_map(java_thread); | |
569 vframe *vf = java_thread->last_java_vframe(®_map); | |
570 int d = 0; | |
571 while ((vf != NULL) && (d < depth)) { | |
572 vf = vf->java_sender(); | |
573 d++; | |
574 } | |
575 return vf; | |
576 } | |
577 | |
578 | |
579 // | |
580 // utilities: JNI objects | |
581 // | |
582 | |
583 | |
584 jclass | |
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585 JvmtiEnvBase::get_jni_class_non_null(Klass* k) { |
0 | 586 assert(k != NULL, "k != NULL"); |
6983 | 587 return (jclass)jni_reference(k->java_mirror()); |
0 | 588 } |
589 | |
590 // | |
591 // Field Information | |
592 // | |
593 | |
594 bool | |
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595 JvmtiEnvBase::get_field_descriptor(Klass* k, jfieldID field, fieldDescriptor* fd) { |
0 | 596 if (!jfieldIDWorkaround::is_valid_jfieldID(k, field)) { |
597 return false; | |
598 } | |
599 bool found = false; | |
600 if (jfieldIDWorkaround::is_static_jfieldID(field)) { | |
601 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(field); | |
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602 found = id->find_local_field(fd); |
0 | 603 } else { |
604 // Non-static field. The fieldID is really the offset of the field within the object. | |
605 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, field); | |
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606 found = InstanceKlass::cast(k)->find_field_from_offset(offset, false, fd); |
0 | 607 } |
608 return found; | |
609 } | |
610 | |
611 // | |
612 // Object Monitor Information | |
613 // | |
614 | |
615 // | |
616 // Count the number of objects for a lightweight monitor. The hobj | |
617 // parameter is object that owns the monitor so this routine will | |
618 // count the number of times the same object was locked by frames | |
619 // in java_thread. | |
620 // | |
621 jint | |
622 JvmtiEnvBase::count_locked_objects(JavaThread *java_thread, Handle hobj) { | |
623 jint ret = 0; | |
624 if (!java_thread->has_last_Java_frame()) { | |
625 return ret; // no Java frames so no monitors | |
626 } | |
627 | |
628 ResourceMark rm; | |
629 HandleMark hm; | |
630 RegisterMap reg_map(java_thread); | |
631 | |
632 for(javaVFrame *jvf=java_thread->last_java_vframe(®_map); jvf != NULL; | |
633 jvf = jvf->java_sender()) { | |
634 GrowableArray<MonitorInfo*>* mons = jvf->monitors(); | |
635 if (!mons->is_empty()) { | |
636 for (int i = 0; i < mons->length(); i++) { | |
637 MonitorInfo *mi = mons->at(i); | |
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638 if (mi->owner_is_scalar_replaced()) continue; |
0 | 639 |
640 // see if owner of the monitor is our object | |
641 if (mi->owner() != NULL && mi->owner() == hobj()) { | |
642 ret++; | |
643 } | |
644 } | |
645 } | |
646 } | |
647 return ret; | |
648 } | |
649 | |
650 | |
651 | |
652 jvmtiError | |
653 JvmtiEnvBase::get_current_contended_monitor(JavaThread *calling_thread, JavaThread *java_thread, jobject *monitor_ptr) { | |
654 #ifdef ASSERT | |
655 uint32_t debug_bits = 0; | |
656 #endif | |
657 assert((SafepointSynchronize::is_at_safepoint() || | |
658 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
659 "at safepoint or target thread is suspended"); | |
660 oop obj = NULL; | |
661 ObjectMonitor *mon = java_thread->current_waiting_monitor(); | |
662 if (mon == NULL) { | |
663 // thread is not doing an Object.wait() call | |
664 mon = java_thread->current_pending_monitor(); | |
665 if (mon != NULL) { | |
666 // The thread is trying to enter() or raw_enter() an ObjectMonitor. | |
667 obj = (oop)mon->object(); | |
668 // If obj == NULL, then ObjectMonitor is raw which doesn't count | |
669 // as contended for this API | |
670 } | |
671 // implied else: no contended ObjectMonitor | |
672 } else { | |
673 // thread is doing an Object.wait() call | |
674 obj = (oop)mon->object(); | |
675 assert(obj != NULL, "Object.wait() should have an object"); | |
676 } | |
677 | |
678 if (obj == NULL) { | |
679 *monitor_ptr = NULL; | |
680 } else { | |
681 HandleMark hm; | |
682 Handle hobj(obj); | |
683 *monitor_ptr = jni_reference(calling_thread, hobj); | |
684 } | |
685 return JVMTI_ERROR_NONE; | |
686 } | |
687 | |
688 | |
689 jvmtiError | |
690 JvmtiEnvBase::get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread, | |
691 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list) { | |
692 jvmtiError err = JVMTI_ERROR_NONE; | |
693 #ifdef ASSERT | |
694 uint32_t debug_bits = 0; | |
695 #endif | |
696 assert((SafepointSynchronize::is_at_safepoint() || | |
697 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
698 "at safepoint or target thread is suspended"); | |
699 | |
700 if (java_thread->has_last_Java_frame()) { | |
701 ResourceMark rm; | |
702 HandleMark hm; | |
703 RegisterMap reg_map(java_thread); | |
704 | |
705 int depth = 0; | |
706 for (javaVFrame *jvf = java_thread->last_java_vframe(®_map); jvf != NULL; | |
707 jvf = jvf->java_sender()) { | |
708 if (depth++ < MaxJavaStackTraceDepth) { // check for stack too deep | |
709 // add locked objects for this frame into list | |
710 err = get_locked_objects_in_frame(calling_thread, java_thread, jvf, owned_monitors_list, depth-1); | |
711 if (err != JVMTI_ERROR_NONE) { | |
712 return err; | |
713 } | |
714 } | |
715 } | |
716 } | |
717 | |
718 // Get off stack monitors. (e.g. acquired via jni MonitorEnter). | |
719 JvmtiMonitorClosure jmc(java_thread, calling_thread, owned_monitors_list, this); | |
720 ObjectSynchronizer::monitors_iterate(&jmc); | |
721 err = jmc.error(); | |
722 | |
723 return err; | |
724 } | |
725 | |
726 // Save JNI local handles for any objects that this frame owns. | |
727 jvmtiError | |
728 JvmtiEnvBase::get_locked_objects_in_frame(JavaThread* calling_thread, JavaThread* java_thread, | |
729 javaVFrame *jvf, GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, int stack_depth) { | |
730 jvmtiError err = JVMTI_ERROR_NONE; | |
731 ResourceMark rm; | |
732 | |
733 GrowableArray<MonitorInfo*>* mons = jvf->monitors(); | |
734 if (mons->is_empty()) { | |
735 return err; // this javaVFrame holds no monitors | |
736 } | |
737 | |
738 HandleMark hm; | |
739 oop wait_obj = NULL; | |
740 { | |
741 // save object of current wait() call (if any) for later comparison | |
742 ObjectMonitor *mon = java_thread->current_waiting_monitor(); | |
743 if (mon != NULL) { | |
744 wait_obj = (oop)mon->object(); | |
745 } | |
746 } | |
747 oop pending_obj = NULL; | |
748 { | |
749 // save object of current enter() call (if any) for later comparison | |
750 ObjectMonitor *mon = java_thread->current_pending_monitor(); | |
751 if (mon != NULL) { | |
752 pending_obj = (oop)mon->object(); | |
753 } | |
754 } | |
755 | |
756 for (int i = 0; i < mons->length(); i++) { | |
757 MonitorInfo *mi = mons->at(i); | |
758 | |
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759 if (mi->owner_is_scalar_replaced()) continue; |
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760 |
0 | 761 oop obj = mi->owner(); |
762 if (obj == NULL) { | |
763 // this monitor doesn't have an owning object so skip it | |
764 continue; | |
765 } | |
766 | |
767 if (wait_obj == obj) { | |
768 // the thread is waiting on this monitor so it isn't really owned | |
769 continue; | |
770 } | |
771 | |
772 if (pending_obj == obj) { | |
773 // the thread is pending on this monitor so it isn't really owned | |
774 continue; | |
775 } | |
776 | |
777 if (owned_monitors_list->length() > 0) { | |
778 // Our list has at least one object on it so we have to check | |
779 // for recursive object locking | |
780 bool found = false; | |
781 for (int j = 0; j < owned_monitors_list->length(); j++) { | |
782 jobject jobj = ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(j))->monitor; | |
783 oop check = JNIHandles::resolve(jobj); | |
784 if (check == obj) { | |
785 found = true; // we found the object | |
786 break; | |
787 } | |
788 } | |
789 | |
790 if (found) { | |
791 // already have this object so don't include it | |
792 continue; | |
793 } | |
794 } | |
795 | |
796 // add the owning object to our list | |
797 jvmtiMonitorStackDepthInfo *jmsdi; | |
798 err = allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); | |
799 if (err != JVMTI_ERROR_NONE) { | |
800 return err; | |
801 } | |
802 Handle hobj(obj); | |
803 jmsdi->monitor = jni_reference(calling_thread, hobj); | |
804 jmsdi->stack_depth = stack_depth; | |
805 owned_monitors_list->append(jmsdi); | |
806 } | |
807 | |
808 return err; | |
809 } | |
810 | |
811 jvmtiError | |
812 JvmtiEnvBase::get_stack_trace(JavaThread *java_thread, | |
813 jint start_depth, jint max_count, | |
814 jvmtiFrameInfo* frame_buffer, jint* count_ptr) { | |
815 #ifdef ASSERT | |
816 uint32_t debug_bits = 0; | |
817 #endif | |
818 assert((SafepointSynchronize::is_at_safepoint() || | |
819 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
820 "at safepoint or target thread is suspended"); | |
821 int count = 0; | |
822 if (java_thread->has_last_Java_frame()) { | |
823 RegisterMap reg_map(java_thread); | |
824 Thread* current_thread = Thread::current(); | |
825 ResourceMark rm(current_thread); | |
826 javaVFrame *jvf = java_thread->last_java_vframe(®_map); | |
827 HandleMark hm(current_thread); | |
828 if (start_depth != 0) { | |
829 if (start_depth > 0) { | |
830 for (int j = 0; j < start_depth && jvf != NULL; j++) { | |
831 jvf = jvf->java_sender(); | |
832 } | |
833 if (jvf == NULL) { | |
834 // start_depth is deeper than the stack depth | |
835 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
836 } | |
837 } else { // start_depth < 0 | |
838 // we are referencing the starting depth based on the oldest | |
839 // part of the stack. | |
840 // optimize to limit the number of times that java_sender() is called | |
841 javaVFrame *jvf_cursor = jvf; | |
842 javaVFrame *jvf_prev = NULL; | |
843 javaVFrame *jvf_prev_prev; | |
844 int j = 0; | |
845 while (jvf_cursor != NULL) { | |
846 jvf_prev_prev = jvf_prev; | |
847 jvf_prev = jvf_cursor; | |
848 for (j = 0; j > start_depth && jvf_cursor != NULL; j--) { | |
849 jvf_cursor = jvf_cursor->java_sender(); | |
850 } | |
851 } | |
852 if (j == start_depth) { | |
853 // previous pointer is exactly where we want to start | |
854 jvf = jvf_prev; | |
855 } else { | |
856 // we need to back up further to get to the right place | |
857 if (jvf_prev_prev == NULL) { | |
858 // the -start_depth is greater than the stack depth | |
859 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
860 } | |
861 // j now is the number of frames on the stack starting with | |
862 // jvf_prev, we start from jvf_prev_prev and move older on | |
863 // the stack that many, the result is -start_depth frames | |
864 // remaining. | |
865 jvf = jvf_prev_prev; | |
866 for (; j < 0; j++) { | |
867 jvf = jvf->java_sender(); | |
868 } | |
869 } | |
870 } | |
871 } | |
872 for (; count < max_count && jvf != NULL; count++) { | |
873 frame_buffer[count].method = jvf->method()->jmethod_id(); | |
874 frame_buffer[count].location = (jvf->method()->is_native() ? -1 : jvf->bci()); | |
875 jvf = jvf->java_sender(); | |
876 } | |
877 } else { | |
878 if (start_depth != 0) { | |
879 // no frames and there is a starting depth | |
880 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
881 } | |
882 } | |
883 *count_ptr = count; | |
884 return JVMTI_ERROR_NONE; | |
885 } | |
886 | |
887 jvmtiError | |
888 JvmtiEnvBase::get_frame_count(JvmtiThreadState *state, jint *count_ptr) { | |
889 assert((state != NULL), | |
890 "JavaThread should create JvmtiThreadState before calling this method"); | |
891 *count_ptr = state->count_frames(); | |
892 return JVMTI_ERROR_NONE; | |
893 } | |
894 | |
895 jvmtiError | |
896 JvmtiEnvBase::get_frame_location(JavaThread *java_thread, jint depth, | |
897 jmethodID* method_ptr, jlocation* location_ptr) { | |
898 #ifdef ASSERT | |
899 uint32_t debug_bits = 0; | |
900 #endif | |
901 assert((SafepointSynchronize::is_at_safepoint() || | |
902 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
903 "at safepoint or target thread is suspended"); | |
904 Thread* current_thread = Thread::current(); | |
905 ResourceMark rm(current_thread); | |
906 | |
907 vframe *vf = vframeFor(java_thread, depth); | |
908 if (vf == NULL) { | |
909 return JVMTI_ERROR_NO_MORE_FRAMES; | |
910 } | |
911 | |
912 // vframeFor should return a java frame. If it doesn't | |
913 // it means we've got an internal error and we return the | |
914 // error in product mode. In debug mode we will instead | |
915 // attempt to cast the vframe to a javaVFrame and will | |
916 // cause an assertion/crash to allow further diagnosis. | |
917 #ifdef PRODUCT | |
918 if (!vf->is_java_frame()) { | |
919 return JVMTI_ERROR_INTERNAL; | |
920 } | |
921 #endif | |
922 | |
923 HandleMark hm(current_thread); | |
924 javaVFrame *jvf = javaVFrame::cast(vf); | |
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925 Method* method = jvf->method(); |
0 | 926 if (method->is_native()) { |
927 *location_ptr = -1; | |
928 } else { | |
929 *location_ptr = jvf->bci(); | |
930 } | |
931 *method_ptr = method->jmethod_id(); | |
932 | |
933 return JVMTI_ERROR_NONE; | |
934 } | |
935 | |
936 | |
937 jvmtiError | |
938 JvmtiEnvBase::get_object_monitor_usage(JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) { | |
939 HandleMark hm; | |
940 Handle hobj; | |
941 | |
942 bool at_safepoint = SafepointSynchronize::is_at_safepoint(); | |
943 | |
944 // Check arguments | |
945 { | |
946 oop mirror = JNIHandles::resolve_external_guard(object); | |
947 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT); | |
948 NULL_CHECK(info_ptr, JVMTI_ERROR_NULL_POINTER); | |
949 | |
950 hobj = Handle(mirror); | |
951 } | |
952 | |
953 JavaThread *owning_thread = NULL; | |
954 ObjectMonitor *mon = NULL; | |
955 jvmtiMonitorUsage ret = { | |
956 NULL, 0, 0, NULL, 0, NULL | |
957 }; | |
958 | |
959 uint32_t debug_bits = 0; | |
960 // first derive the object's owner and entry_count (if any) | |
961 { | |
962 // Revoke any biases before querying the mark word | |
963 if (SafepointSynchronize::is_at_safepoint()) { | |
964 BiasedLocking::revoke_at_safepoint(hobj); | |
965 } else { | |
966 BiasedLocking::revoke_and_rebias(hobj, false, calling_thread); | |
967 } | |
968 | |
969 address owner = NULL; | |
970 { | |
971 markOop mark = hobj()->mark(); | |
972 | |
973 if (!mark->has_monitor()) { | |
974 // this object has a lightweight monitor | |
975 | |
976 if (mark->has_locker()) { | |
977 owner = (address)mark->locker(); // save the address of the Lock word | |
978 } | |
979 // implied else: no owner | |
980 } else { | |
981 // this object has a heavyweight monitor | |
982 mon = mark->monitor(); | |
983 | |
984 // The owner field of a heavyweight monitor may be NULL for no | |
985 // owner, a JavaThread * or it may still be the address of the | |
986 // Lock word in a JavaThread's stack. A monitor can be inflated | |
987 // by a non-owning JavaThread, but only the owning JavaThread | |
988 // can change the owner field from the Lock word to the | |
989 // JavaThread * and it may not have done that yet. | |
990 owner = (address)mon->owner(); | |
991 } | |
992 } | |
993 | |
994 if (owner != NULL) { | |
995 // This monitor is owned so we have to find the owning JavaThread. | |
996 // Since owning_thread_from_monitor_owner() grabs a lock, GC can | |
997 // move our object at this point. However, our owner value is safe | |
998 // since it is either the Lock word on a stack or a JavaThread *. | |
999 owning_thread = Threads::owning_thread_from_monitor_owner(owner, !at_safepoint); | |
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1000 // Cannot assume (owning_thread != NULL) here because this function |
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1001 // may not have been called at a safepoint and the owning_thread |
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1002 // might not be suspended. |
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1003 if (owning_thread != NULL) { |
0 | 1004 // The monitor's owner either has to be the current thread, at safepoint |
1005 // or it has to be suspended. Any of these conditions will prevent both | |
1006 // contending and waiting threads from modifying the state of | |
1007 // the monitor. | |
1008 if (!at_safepoint && !JvmtiEnv::is_thread_fully_suspended(owning_thread, true, &debug_bits)) { | |
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1009 // Don't worry! This return of JVMTI_ERROR_THREAD_NOT_SUSPENDED |
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1010 // will not make it back to the JVM/TI agent. The error code will |
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1011 // get intercepted in JvmtiEnv::GetObjectMonitorUsage() which |
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1012 // will retry the call via a VM_GetObjectMonitorUsage VM op. |
0 | 1013 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; |
1014 } | |
1015 HandleMark hm; | |
1016 Handle th(owning_thread->threadObj()); | |
1017 ret.owner = (jthread)jni_reference(calling_thread, th); | |
1018 } | |
1019 // implied else: no owner | |
1020 } | |
1021 | |
1022 if (owning_thread != NULL) { // monitor is owned | |
1023 if ((address)owning_thread == owner) { | |
1024 // the owner field is the JavaThread * | |
1025 assert(mon != NULL, | |
1026 "must have heavyweight monitor with JavaThread * owner"); | |
1027 ret.entry_count = mon->recursions() + 1; | |
1028 } else { | |
1029 // The owner field is the Lock word on the JavaThread's stack | |
1030 // so the recursions field is not valid. We have to count the | |
1031 // number of recursive monitor entries the hard way. We pass | |
1032 // a handle to survive any GCs along the way. | |
1033 ResourceMark rm; | |
1034 ret.entry_count = count_locked_objects(owning_thread, hobj); | |
1035 } | |
1036 } | |
1037 // implied else: entry_count == 0 | |
1038 } | |
1039 | |
1040 int nWant,nWait; | |
1041 if (mon != NULL) { | |
1042 // this object has a heavyweight monitor | |
1043 nWant = mon->contentions(); // # of threads contending for monitor | |
1044 nWait = mon->waiters(); // # of threads in Object.wait() | |
1045 ret.waiter_count = nWant + nWait; | |
1046 ret.notify_waiter_count = nWait; | |
1047 } else { | |
1048 // this object has a lightweight monitor | |
1049 ret.waiter_count = 0; | |
1050 ret.notify_waiter_count = 0; | |
1051 } | |
1052 | |
1053 // Allocate memory for heavyweight and lightweight monitor. | |
1054 jvmtiError err; | |
1055 err = allocate(ret.waiter_count * sizeof(jthread *), (unsigned char**)&ret.waiters); | |
1056 if (err != JVMTI_ERROR_NONE) { | |
1057 return err; | |
1058 } | |
1059 err = allocate(ret.notify_waiter_count * sizeof(jthread *), | |
1060 (unsigned char**)&ret.notify_waiters); | |
1061 if (err != JVMTI_ERROR_NONE) { | |
1062 deallocate((unsigned char*)ret.waiters); | |
1063 return err; | |
1064 } | |
1065 | |
1066 // now derive the rest of the fields | |
1067 if (mon != NULL) { | |
1068 // this object has a heavyweight monitor | |
1069 | |
1070 // Number of waiters may actually be less than the waiter count. | |
1071 // So NULL out memory so that unused memory will be NULL. | |
1072 memset(ret.waiters, 0, ret.waiter_count * sizeof(jthread *)); | |
1073 memset(ret.notify_waiters, 0, ret.notify_waiter_count * sizeof(jthread *)); | |
1074 | |
1075 if (ret.waiter_count > 0) { | |
1076 // we have contending and/or waiting threads | |
1077 HandleMark hm; | |
1078 if (nWant > 0) { | |
1079 // we have contending threads | |
1080 ResourceMark rm; | |
1081 // get_pending_threads returns only java thread so we do not need to | |
1082 // check for non java threads. | |
1083 GrowableArray<JavaThread*>* wantList = Threads::get_pending_threads( | |
1084 nWant, (address)mon, !at_safepoint); | |
1085 if (wantList->length() < nWant) { | |
1086 // robustness: the pending list has gotten smaller | |
1087 nWant = wantList->length(); | |
1088 } | |
1089 for (int i = 0; i < nWant; i++) { | |
1090 JavaThread *pending_thread = wantList->at(i); | |
1091 // If the monitor has no owner, then a non-suspended contending | |
1092 // thread could potentially change the state of the monitor by | |
1093 // entering it. The JVM/TI spec doesn't allow this. | |
1094 if (owning_thread == NULL && !at_safepoint & | |
1095 !JvmtiEnv::is_thread_fully_suspended(pending_thread, true, &debug_bits)) { | |
1096 if (ret.owner != NULL) { | |
1097 destroy_jni_reference(calling_thread, ret.owner); | |
1098 } | |
1099 for (int j = 0; j < i; j++) { | |
1100 destroy_jni_reference(calling_thread, ret.waiters[j]); | |
1101 } | |
1102 deallocate((unsigned char*)ret.waiters); | |
1103 deallocate((unsigned char*)ret.notify_waiters); | |
1104 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
1105 } | |
1106 Handle th(pending_thread->threadObj()); | |
1107 ret.waiters[i] = (jthread)jni_reference(calling_thread, th); | |
1108 } | |
1109 } | |
1110 if (nWait > 0) { | |
1111 // we have threads in Object.wait() | |
1112 int offset = nWant; // add after any contending threads | |
1113 ObjectWaiter *waiter = mon->first_waiter(); | |
1114 for (int i = 0, j = 0; i < nWait; i++) { | |
1115 if (waiter == NULL) { | |
1116 // robustness: the waiting list has gotten smaller | |
1117 nWait = j; | |
1118 break; | |
1119 } | |
1120 Thread *t = mon->thread_of_waiter(waiter); | |
1121 if (t != NULL && t->is_Java_thread()) { | |
1122 JavaThread *wjava_thread = (JavaThread *)t; | |
1123 // If the thread was found on the ObjectWaiter list, then | |
1124 // it has not been notified. This thread can't change the | |
1125 // state of the monitor so it doesn't need to be suspended. | |
1126 Handle th(wjava_thread->threadObj()); | |
1127 ret.waiters[offset + j] = (jthread)jni_reference(calling_thread, th); | |
1128 ret.notify_waiters[j++] = (jthread)jni_reference(calling_thread, th); | |
1129 } | |
1130 waiter = mon->next_waiter(waiter); | |
1131 } | |
1132 } | |
1133 } | |
1134 | |
1135 // Adjust count. nWant and nWait count values may be less than original. | |
1136 ret.waiter_count = nWant + nWait; | |
1137 ret.notify_waiter_count = nWait; | |
1138 } else { | |
1139 // this object has a lightweight monitor and we have nothing more | |
1140 // to do here because the defaults are just fine. | |
1141 } | |
1142 | |
1143 // we don't update return parameter unless everything worked | |
1144 *info_ptr = ret; | |
1145 | |
1146 return JVMTI_ERROR_NONE; | |
1147 } | |
1148 | |
1149 ResourceTracker::ResourceTracker(JvmtiEnv* env) { | |
1150 _env = env; | |
6197 | 1151 _allocations = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<unsigned char*>(20, true); |
0 | 1152 _failed = false; |
1153 } | |
1154 ResourceTracker::~ResourceTracker() { | |
1155 if (_failed) { | |
1156 for (int i=0; i<_allocations->length(); i++) { | |
1157 _env->deallocate(_allocations->at(i)); | |
1158 } | |
1159 } | |
1160 delete _allocations; | |
1161 } | |
1162 | |
1163 jvmtiError ResourceTracker::allocate(jlong size, unsigned char** mem_ptr) { | |
1164 unsigned char *ptr; | |
1165 jvmtiError err = _env->allocate(size, &ptr); | |
1166 if (err == JVMTI_ERROR_NONE) { | |
1167 _allocations->append(ptr); | |
1168 *mem_ptr = ptr; | |
1169 } else { | |
1170 *mem_ptr = NULL; | |
1171 _failed = true; | |
1172 } | |
1173 return err; | |
1174 } | |
1175 | |
1176 unsigned char* ResourceTracker::allocate(jlong size) { | |
1177 unsigned char* ptr; | |
1178 allocate(size, &ptr); | |
1179 return ptr; | |
1180 } | |
1181 | |
1182 char* ResourceTracker::strdup(const char* str) { | |
1183 char *dup_str = (char*)allocate(strlen(str)+1); | |
1184 if (dup_str != NULL) { | |
1185 strcpy(dup_str, str); | |
1186 } | |
1187 return dup_str; | |
1188 } | |
1189 | |
1190 struct StackInfoNode { | |
1191 struct StackInfoNode *next; | |
1192 jvmtiStackInfo info; | |
1193 }; | |
1194 | |
1195 // Create a jvmtiStackInfo inside a linked list node and create a | |
1196 // buffer for the frame information, both allocated as resource objects. | |
1197 // Fill in both the jvmtiStackInfo and the jvmtiFrameInfo. | |
1198 // Note that either or both of thr and thread_oop | |
1199 // may be null if the thread is new or has exited. | |
1200 void | |
1201 VM_GetMultipleStackTraces::fill_frames(jthread jt, JavaThread *thr, oop thread_oop) { | |
1202 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1203 | |
1204 jint state = 0; | |
1205 struct StackInfoNode *node = NEW_RESOURCE_OBJ(struct StackInfoNode); | |
1206 jvmtiStackInfo *infop = &(node->info); | |
1207 node->next = head(); | |
1208 set_head(node); | |
1209 infop->frame_count = 0; | |
1210 infop->thread = jt; | |
1211 | |
1212 if (thread_oop != NULL) { | |
1213 // get most state bits | |
1214 state = (jint)java_lang_Thread::get_thread_status(thread_oop); | |
1215 } | |
1216 | |
1217 if (thr != NULL) { // add more state bits if there is a JavaThead to query | |
1218 // same as is_being_ext_suspended() but without locking | |
1219 if (thr->is_ext_suspended() || thr->is_external_suspend()) { | |
1220 state |= JVMTI_THREAD_STATE_SUSPENDED; | |
1221 } | |
1222 JavaThreadState jts = thr->thread_state(); | |
1223 if (jts == _thread_in_native) { | |
1224 state |= JVMTI_THREAD_STATE_IN_NATIVE; | |
1225 } | |
1226 OSThread* osThread = thr->osthread(); | |
1227 if (osThread != NULL && osThread->interrupted()) { | |
1228 state |= JVMTI_THREAD_STATE_INTERRUPTED; | |
1229 } | |
1230 } | |
1231 infop->state = state; | |
1232 | |
1233 if (thr != NULL || (state & JVMTI_THREAD_STATE_ALIVE) != 0) { | |
1234 infop->frame_buffer = NEW_RESOURCE_ARRAY(jvmtiFrameInfo, max_frame_count()); | |
1235 env()->get_stack_trace(thr, 0, max_frame_count(), | |
1236 infop->frame_buffer, &(infop->frame_count)); | |
1237 } else { | |
1238 infop->frame_buffer = NULL; | |
1239 infop->frame_count = 0; | |
1240 } | |
1241 _frame_count_total += infop->frame_count; | |
1242 } | |
1243 | |
1244 // Based on the stack information in the linked list, allocate memory | |
1245 // block to return and fill it from the info in the linked list. | |
1246 void | |
1247 VM_GetMultipleStackTraces::allocate_and_fill_stacks(jint thread_count) { | |
1248 // do I need to worry about alignment issues? | |
1249 jlong alloc_size = thread_count * sizeof(jvmtiStackInfo) | |
1250 + _frame_count_total * sizeof(jvmtiFrameInfo); | |
1251 env()->allocate(alloc_size, (unsigned char **)&_stack_info); | |
1252 | |
1253 // pointers to move through the newly allocated space as it is filled in | |
1254 jvmtiStackInfo *si = _stack_info + thread_count; // bottom of stack info | |
1255 jvmtiFrameInfo *fi = (jvmtiFrameInfo *)si; // is the top of frame info | |
1256 | |
1257 // copy information in resource area into allocated buffer | |
1258 // insert stack info backwards since linked list is backwards | |
1259 // insert frame info forwards | |
1260 // walk the StackInfoNodes | |
1261 for (struct StackInfoNode *sin = head(); sin != NULL; sin = sin->next) { | |
1262 jint frame_count = sin->info.frame_count; | |
1263 size_t frames_size = frame_count * sizeof(jvmtiFrameInfo); | |
1264 --si; | |
1265 memcpy(si, &(sin->info), sizeof(jvmtiStackInfo)); | |
1266 if (frames_size == 0) { | |
1267 si->frame_buffer = NULL; | |
1268 } else { | |
1269 memcpy(fi, sin->info.frame_buffer, frames_size); | |
1270 si->frame_buffer = fi; // point to the new allocated copy of the frames | |
1271 fi += frame_count; | |
1272 } | |
1273 } | |
1274 assert(si == _stack_info, "the last copied stack info must be the first record"); | |
1275 assert((unsigned char *)fi == ((unsigned char *)_stack_info) + alloc_size, | |
1276 "the last copied frame info must be the last record"); | |
1277 } | |
1278 | |
1279 | |
1280 void | |
1281 VM_GetThreadListStackTraces::doit() { | |
1282 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1283 | |
1284 ResourceMark rm; | |
1285 for (int i = 0; i < _thread_count; ++i) { | |
1286 jthread jt = _thread_list[i]; | |
1287 oop thread_oop = JNIHandles::resolve_external_guard(jt); | |
1142 | 1288 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) { |
0 | 1289 set_result(JVMTI_ERROR_INVALID_THREAD); |
1290 return; | |
1291 } | |
1292 fill_frames(jt, java_lang_Thread::thread(thread_oop), thread_oop); | |
1293 } | |
1294 allocate_and_fill_stacks(_thread_count); | |
1295 } | |
1296 | |
1297 void | |
1298 VM_GetAllStackTraces::doit() { | |
1299 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1300 | |
1301 ResourceMark rm; | |
1302 _final_thread_count = 0; | |
1303 for (JavaThread *jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
1304 oop thread_oop = jt->threadObj(); | |
1305 if (thread_oop != NULL && | |
1306 !jt->is_exiting() && | |
1307 java_lang_Thread::is_alive(thread_oop) && | |
1308 !jt->is_hidden_from_external_view()) { | |
1309 ++_final_thread_count; | |
1310 // Handle block of the calling thread is used to create local refs. | |
1311 fill_frames((jthread)JNIHandles::make_local(_calling_thread, thread_oop), | |
1312 jt, thread_oop); | |
1313 } | |
1314 } | |
1315 allocate_and_fill_stacks(_final_thread_count); | |
1316 } | |
1317 | |
1318 // Verifies that the top frame is a java frame in an expected state. | |
1319 // Deoptimizes frame if needed. | |
1320 // Checks that the frame method signature matches the return type (tos). | |
1321 // HandleMark must be defined in the caller only. | |
1322 // It is to keep a ret_ob_h handle alive after return to the caller. | |
1323 jvmtiError | |
1324 JvmtiEnvBase::check_top_frame(JavaThread* current_thread, JavaThread* java_thread, | |
1325 jvalue value, TosState tos, Handle* ret_ob_h) { | |
1326 ResourceMark rm(current_thread); | |
1327 | |
1328 vframe *vf = vframeFor(java_thread, 0); | |
1329 NULL_CHECK(vf, JVMTI_ERROR_NO_MORE_FRAMES); | |
1330 | |
1331 javaVFrame *jvf = (javaVFrame*) vf; | |
1332 if (!vf->is_java_frame() || jvf->method()->is_native()) { | |
1333 return JVMTI_ERROR_OPAQUE_FRAME; | |
1334 } | |
1335 | |
1336 // If the frame is a compiled one, need to deoptimize it. | |
1337 if (vf->is_compiled_frame()) { | |
1338 if (!vf->fr().can_be_deoptimized()) { | |
1339 return JVMTI_ERROR_OPAQUE_FRAME; | |
1340 } | |
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1341 Deoptimization::deoptimize_frame(java_thread, jvf->fr().id(), Deoptimization::Reason_constraint); |
0 | 1342 } |
1343 | |
1344 // Get information about method return type | |
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1345 Symbol* signature = jvf->method()->signature(); |
0 | 1346 |
1347 ResultTypeFinder rtf(signature); | |
1348 TosState fr_tos = as_TosState(rtf.type()); | |
1349 if (fr_tos != tos) { | |
1350 if (tos != itos || (fr_tos != btos && fr_tos != ctos && fr_tos != stos)) { | |
1351 return JVMTI_ERROR_TYPE_MISMATCH; | |
1352 } | |
1353 } | |
1354 | |
1355 // Check that the jobject class matches the return type signature. | |
1356 jobject jobj = value.l; | |
1357 if (tos == atos && jobj != NULL) { // NULL reference is allowed | |
1358 Handle ob_h = Handle(current_thread, JNIHandles::resolve_external_guard(jobj)); | |
1359 NULL_CHECK(ob_h, JVMTI_ERROR_INVALID_OBJECT); | |
1360 KlassHandle ob_kh = KlassHandle(current_thread, ob_h()->klass()); | |
1361 NULL_CHECK(ob_kh, JVMTI_ERROR_INVALID_OBJECT); | |
1362 | |
1363 // Method return type signature. | |
1364 char* ty_sign = 1 + strchr(signature->as_C_string(), ')'); | |
1365 | |
6983 | 1366 if (!VM_GetOrSetLocal::is_assignable(ty_sign, ob_kh(), current_thread)) { |
0 | 1367 return JVMTI_ERROR_TYPE_MISMATCH; |
1368 } | |
1369 *ret_ob_h = ob_h; | |
1370 } | |
1371 return JVMTI_ERROR_NONE; | |
1372 } /* end check_top_frame */ | |
1373 | |
1374 | |
1375 // ForceEarlyReturn<type> follows the PopFrame approach in many aspects. | |
1376 // Main difference is on the last stage in the interpreter. | |
1377 // The PopFrame stops method execution to continue execution | |
1378 // from the same method call instruction. | |
1379 // The ForceEarlyReturn forces return from method so the execution | |
1380 // continues at the bytecode following the method call. | |
1381 | |
1382 // Threads_lock NOT held, java_thread not protected by lock | |
1383 // java_thread - pre-checked | |
1384 | |
1385 jvmtiError | |
1386 JvmtiEnvBase::force_early_return(JavaThread* java_thread, jvalue value, TosState tos) { | |
1387 JavaThread* current_thread = JavaThread::current(); | |
1388 HandleMark hm(current_thread); | |
1389 uint32_t debug_bits = 0; | |
1390 | |
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1391 // retrieve or create the state |
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1392 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); |
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1393 if (state == NULL) { |
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1394 return JVMTI_ERROR_THREAD_NOT_ALIVE; |
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1395 } |
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1396 |
0 | 1397 // Check if java_thread is fully suspended |
1398 if (!is_thread_fully_suspended(java_thread, | |
1399 true /* wait for suspend completion */, | |
1400 &debug_bits)) { | |
1401 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
1402 } | |
1403 | |
1404 // Check to see if a ForceEarlyReturn was already in progress | |
1405 if (state->is_earlyret_pending()) { | |
1406 // Probably possible for JVMTI clients to trigger this, but the | |
1407 // JPDA backend shouldn't allow this to happen | |
1408 return JVMTI_ERROR_INTERNAL; | |
1409 } | |
1410 { | |
1411 // The same as for PopFrame. Workaround bug: | |
1412 // 4812902: popFrame hangs if the method is waiting at a synchronize | |
1413 // Catch this condition and return an error to avoid hanging. | |
1414 // Now JVMTI spec allows an implementation to bail out with an opaque | |
1415 // frame error. | |
1416 OSThread* osThread = java_thread->osthread(); | |
1417 if (osThread->get_state() == MONITOR_WAIT) { | |
1418 return JVMTI_ERROR_OPAQUE_FRAME; | |
1419 } | |
1420 } | |
1421 Handle ret_ob_h = Handle(); | |
1422 jvmtiError err = check_top_frame(current_thread, java_thread, value, tos, &ret_ob_h); | |
1423 if (err != JVMTI_ERROR_NONE) { | |
1424 return err; | |
1425 } | |
1426 assert(tos != atos || value.l == NULL || ret_ob_h() != NULL, | |
1427 "return object oop must not be NULL if jobject is not NULL"); | |
1428 | |
1429 // Update the thread state to reflect that the top frame must be | |
1430 // forced to return. | |
1431 // The current frame will be returned later when the suspended | |
1432 // thread is resumed and right before returning from VM to Java. | |
1433 // (see call_VM_base() in assembler_<cpu>.cpp). | |
1434 | |
1435 state->set_earlyret_pending(); | |
1436 state->set_earlyret_oop(ret_ob_h()); | |
1437 state->set_earlyret_value(value, tos); | |
1438 | |
1439 // Set pending step flag for this early return. | |
1440 // It is cleared when next step event is posted. | |
1441 state->set_pending_step_for_earlyret(); | |
1442 | |
1443 return JVMTI_ERROR_NONE; | |
1444 } /* end force_early_return */ | |
1445 | |
1446 void | |
1447 JvmtiMonitorClosure::do_monitor(ObjectMonitor* mon) { | |
1448 if ( _error != JVMTI_ERROR_NONE) { | |
1449 // Error occurred in previous iteration so no need to add | |
1450 // to the list. | |
1451 return; | |
1452 } | |
1453 if (mon->owner() == _java_thread ) { | |
1454 // Filter out on stack monitors collected during stack walk. | |
1455 oop obj = (oop)mon->object(); | |
1456 bool found = false; | |
1457 for (int j = 0; j < _owned_monitors_list->length(); j++) { | |
1458 jobject jobj = ((jvmtiMonitorStackDepthInfo*)_owned_monitors_list->at(j))->monitor; | |
1459 oop check = JNIHandles::resolve(jobj); | |
1460 if (check == obj) { | |
1461 // On stack monitor already collected during the stack walk. | |
1462 found = true; | |
1463 break; | |
1464 } | |
1465 } | |
1466 if (found == false) { | |
1467 // This is off stack monitor (e.g. acquired via jni MonitorEnter). | |
1468 jvmtiError err; | |
1469 jvmtiMonitorStackDepthInfo *jmsdi; | |
1470 err = _env->allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); | |
1471 if (err != JVMTI_ERROR_NONE) { | |
1472 _error = err; | |
1473 return; | |
1474 } | |
1475 Handle hobj(obj); | |
1476 jmsdi->monitor = _env->jni_reference(_calling_thread, hobj); | |
1477 // stack depth is unknown for this monitor. | |
1478 jmsdi->stack_depth = -1; | |
1479 _owned_monitors_list->append(jmsdi); | |
1480 } | |
1481 } | |
1482 } |