Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiEnvBase.cpp @ 20463:ed3d653e4012
8055289: Internal Error: mallocTracker.cpp:146 fatal error: Should not use malloc for big memory block, use virtual memory instead
Summary: Return NULL if memory allocation size is bigger than MAX_MALLOC_SIZE when NMT is on
Reviewed-by: coleenp, gtriantafill
author | zgu |
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date | Thu, 04 Sep 2014 14:50:31 -0400 |
parents | ce8f6bb717c9 |
children | 7848fc12602b |
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" | |
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44 #include "runtime/thread.inline.hpp" |
1972 | 45 #include "runtime/vframe.hpp" |
46 #include "runtime/vframe_hp.hpp" | |
47 #include "runtime/vmThread.hpp" | |
48 #include "runtime/vm_operations.hpp" | |
0 | 49 |
50 /////////////////////////////////////////////////////////////// | |
51 // | |
52 // JvmtiEnvBase | |
53 // | |
54 | |
55 JvmtiEnvBase* JvmtiEnvBase::_head_environment = NULL; | |
56 | |
57 bool JvmtiEnvBase::_globally_initialized = false; | |
58 volatile bool JvmtiEnvBase::_needs_clean_up = false; | |
59 | |
60 jvmtiPhase JvmtiEnvBase::_phase = JVMTI_PHASE_PRIMORDIAL; | |
61 | |
62 volatile int JvmtiEnvBase::_dying_thread_env_iteration_count = 0; | |
63 | |
64 extern jvmtiInterface_1_ jvmti_Interface; | |
65 extern jvmtiInterface_1_ jvmtiTrace_Interface; | |
66 | |
67 | |
68 // perform initializations that must occur before any JVMTI environments | |
69 // are released but which should only be initialized once (no matter | |
70 // how many environments are created). | |
71 void | |
72 JvmtiEnvBase::globally_initialize() { | |
73 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
74 assert(_globally_initialized == false, "bad call"); | |
75 | |
76 JvmtiManageCapabilities::initialize(); | |
77 | |
78 // register extension functions and events | |
79 JvmtiExtensions::register_extensions(); | |
80 | |
81 #ifdef JVMTI_TRACE | |
82 JvmtiTrace::initialize(); | |
83 #endif | |
84 | |
85 _globally_initialized = true; | |
86 } | |
87 | |
88 | |
89 void | |
90 JvmtiEnvBase::initialize() { | |
91 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
92 | |
93 // Add this environment to the end of the environment list (order is important) | |
94 { | |
95 // This block of code must not contain any safepoints, as list deallocation | |
96 // (which occurs at a safepoint) cannot occur simultaneously with this list | |
97 // addition. Note: No_Safepoint_Verifier cannot, currently, be used before | |
98 // threads exist. | |
99 JvmtiEnvIterator it; | |
100 JvmtiEnvBase *previous_env = NULL; | |
101 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
102 previous_env = env; | |
103 } | |
104 if (previous_env == NULL) { | |
105 _head_environment = this; | |
106 } else { | |
107 previous_env->set_next_environment(this); | |
108 } | |
109 } | |
110 | |
111 if (_globally_initialized == false) { | |
112 globally_initialize(); | |
113 } | |
114 } | |
115 | |
116 | |
611
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117 bool |
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118 JvmtiEnvBase::is_valid() { |
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119 jint value = 0; |
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120 |
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121 // This object might not be a JvmtiEnvBase so we can't assume |
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122 // the _magic field is properly aligned. Get the value in a safe |
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123 // way and then check against JVMTI_MAGIC. |
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124 |
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125 switch (sizeof(_magic)) { |
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126 case 2: |
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127 value = Bytes::get_native_u2((address)&_magic); |
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128 break; |
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129 |
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130 case 4: |
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131 value = Bytes::get_native_u4((address)&_magic); |
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132 break; |
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133 |
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134 case 8: |
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135 value = Bytes::get_native_u8((address)&_magic); |
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136 break; |
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137 |
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138 default: |
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139 guarantee(false, "_magic field is an unexpected size"); |
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140 } |
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141 |
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142 return value == JVMTI_MAGIC; |
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143 } |
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144 |
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145 |
1122 | 146 bool |
1121 | 147 JvmtiEnvBase::use_version_1_0_semantics() { |
148 int major, minor, micro; | |
149 | |
150 JvmtiExport::decode_version_values(_version, &major, &minor, µ); | |
151 return major == 1 && minor == 0; // micro version doesn't matter here | |
152 } | |
153 | |
154 | |
155 bool | |
156 JvmtiEnvBase::use_version_1_1_semantics() { | |
157 int major, minor, micro; | |
158 | |
159 JvmtiExport::decode_version_values(_version, &major, &minor, µ); | |
160 return major == 1 && minor == 1; // micro version doesn't matter here | |
161 } | |
162 | |
1988 | 163 bool |
164 JvmtiEnvBase::use_version_1_2_semantics() { | |
165 int major, minor, micro; | |
166 | |
167 JvmtiExport::decode_version_values(_version, &major, &minor, µ); | |
168 return major == 1 && minor == 2; // micro version doesn't matter here | |
169 } | |
170 | |
1121 | 171 |
172 JvmtiEnvBase::JvmtiEnvBase(jint version) : _env_event_enable() { | |
173 _version = version; | |
0 | 174 _env_local_storage = NULL; |
175 _tag_map = NULL; | |
176 _native_method_prefix_count = 0; | |
177 _native_method_prefixes = NULL; | |
178 _next = NULL; | |
179 _class_file_load_hook_ever_enabled = false; | |
180 | |
181 // Moot since ClassFileLoadHook not yet enabled. | |
182 // But "true" will give a more predictable ClassFileLoadHook behavior | |
183 // for environment creation during ClassFileLoadHook. | |
184 _is_retransformable = true; | |
185 | |
186 // all callbacks initially NULL | |
187 memset(&_event_callbacks,0,sizeof(jvmtiEventCallbacks)); | |
188 | |
189 // all capabilities initially off | |
190 memset(&_current_capabilities, 0, sizeof(_current_capabilities)); | |
191 | |
192 // all prohibited capabilities initially off | |
193 memset(&_prohibited_capabilities, 0, sizeof(_prohibited_capabilities)); | |
194 | |
195 _magic = JVMTI_MAGIC; | |
196 | |
197 JvmtiEventController::env_initialize((JvmtiEnv*)this); | |
198 | |
199 #ifdef JVMTI_TRACE | |
371 | 200 _jvmti_external.functions = TraceJVMTI != NULL ? &jvmtiTrace_Interface : &jvmti_Interface; |
0 | 201 #else |
202 _jvmti_external.functions = &jvmti_Interface; | |
203 #endif | |
204 } | |
205 | |
206 | |
207 void | |
208 JvmtiEnvBase::dispose() { | |
209 | |
210 #ifdef JVMTI_TRACE | |
211 JvmtiTrace::shutdown(); | |
212 #endif | |
213 | |
214 // Dispose of event info and let the event controller call us back | |
215 // in a locked state (env_dispose, below) | |
216 JvmtiEventController::env_dispose(this); | |
217 } | |
218 | |
219 void | |
220 JvmtiEnvBase::env_dispose() { | |
221 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
222 | |
223 // We have been entered with all events disabled on this environment. | |
224 // A race to re-enable events (by setting callbacks) is prevented by | |
225 // checking for a valid environment when setting callbacks (while | |
226 // holding the JvmtiThreadState_lock). | |
227 | |
228 // Mark as invalid. | |
229 _magic = DISPOSED_MAGIC; | |
230 | |
231 // Relinquish all capabilities. | |
232 jvmtiCapabilities *caps = get_capabilities(); | |
233 JvmtiManageCapabilities::relinquish_capabilities(caps, caps, caps); | |
234 | |
235 // Same situation as with events (see above) | |
236 set_native_method_prefixes(0, NULL); | |
237 | |
238 JvmtiTagMap* tag_map_to_deallocate = _tag_map; | |
239 set_tag_map(NULL); | |
240 // A tag map can be big, deallocate it now | |
241 if (tag_map_to_deallocate != NULL) { | |
242 delete tag_map_to_deallocate; | |
243 } | |
244 | |
245 _needs_clean_up = true; | |
246 } | |
247 | |
248 | |
249 JvmtiEnvBase::~JvmtiEnvBase() { | |
250 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
251 | |
252 // There is a small window of time during which the tag map of a | |
253 // disposed environment could have been reallocated. | |
254 // Make sure it is gone. | |
255 JvmtiTagMap* tag_map_to_deallocate = _tag_map; | |
256 set_tag_map(NULL); | |
257 // A tag map can be big, deallocate it now | |
258 if (tag_map_to_deallocate != NULL) { | |
259 delete tag_map_to_deallocate; | |
260 } | |
261 | |
262 _magic = BAD_MAGIC; | |
263 } | |
264 | |
265 | |
266 void | |
267 JvmtiEnvBase::periodic_clean_up() { | |
268 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
269 | |
270 // JvmtiEnvBase reference is saved in JvmtiEnvThreadState. So | |
271 // clean up JvmtiThreadState before deleting JvmtiEnv pointer. | |
272 JvmtiThreadState::periodic_clean_up(); | |
273 | |
274 // Unlink all invalid environments from the list of environments | |
275 // and deallocate them | |
276 JvmtiEnvIterator it; | |
277 JvmtiEnvBase* previous_env = NULL; | |
278 JvmtiEnvBase* env = it.first(); | |
279 while (env != NULL) { | |
280 if (env->is_valid()) { | |
281 previous_env = env; | |
282 env = it.next(env); | |
283 } else { | |
284 // This one isn't valid, remove it from the list and deallocate it | |
285 JvmtiEnvBase* defunct_env = env; | |
286 env = it.next(env); | |
287 if (previous_env == NULL) { | |
288 _head_environment = env; | |
289 } else { | |
290 previous_env->set_next_environment(env); | |
291 } | |
292 delete defunct_env; | |
293 } | |
294 } | |
295 | |
296 } | |
297 | |
298 | |
299 void | |
300 JvmtiEnvBase::check_for_periodic_clean_up() { | |
301 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
302 | |
303 class ThreadInsideIterationClosure: public ThreadClosure { | |
304 private: | |
305 bool _inside; | |
306 public: | |
307 ThreadInsideIterationClosure() : _inside(false) {}; | |
308 | |
309 void do_thread(Thread* thread) { | |
310 _inside |= thread->is_inside_jvmti_env_iteration(); | |
311 } | |
312 | |
313 bool is_inside_jvmti_env_iteration() { | |
314 return _inside; | |
315 } | |
316 }; | |
317 | |
318 if (_needs_clean_up) { | |
319 // Check if we are currently iterating environment, | |
320 // deallocation should not occur if we are | |
321 ThreadInsideIterationClosure tiic; | |
322 Threads::threads_do(&tiic); | |
323 if (!tiic.is_inside_jvmti_env_iteration() && | |
324 !is_inside_dying_thread_env_iteration()) { | |
325 _needs_clean_up = false; | |
326 JvmtiEnvBase::periodic_clean_up(); | |
327 } | |
328 } | |
329 } | |
330 | |
331 | |
332 void | |
333 JvmtiEnvBase::record_first_time_class_file_load_hook_enabled() { | |
334 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), | |
335 "sanity check"); | |
336 | |
337 if (!_class_file_load_hook_ever_enabled) { | |
338 _class_file_load_hook_ever_enabled = true; | |
339 | |
340 if (get_capabilities()->can_retransform_classes) { | |
341 _is_retransformable = true; | |
342 } else { | |
343 _is_retransformable = false; | |
344 | |
345 // cannot add retransform capability after ClassFileLoadHook has been enabled | |
346 get_prohibited_capabilities()->can_retransform_classes = 1; | |
347 } | |
348 } | |
349 } | |
350 | |
351 | |
352 void | |
353 JvmtiEnvBase::record_class_file_load_hook_enabled() { | |
354 if (!_class_file_load_hook_ever_enabled) { | |
355 if (Threads::number_of_threads() == 0) { | |
356 record_first_time_class_file_load_hook_enabled(); | |
357 } else { | |
358 MutexLocker mu(JvmtiThreadState_lock); | |
359 record_first_time_class_file_load_hook_enabled(); | |
360 } | |
361 } | |
362 } | |
363 | |
364 | |
365 jvmtiError | |
366 JvmtiEnvBase::set_native_method_prefixes(jint prefix_count, char** prefixes) { | |
367 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), | |
368 "sanity check"); | |
369 | |
370 int old_prefix_count = get_native_method_prefix_count(); | |
371 char **old_prefixes = get_native_method_prefixes(); | |
372 | |
373 // allocate and install the new prefixex | |
374 if (prefix_count == 0 || !is_valid()) { | |
375 _native_method_prefix_count = 0; | |
376 _native_method_prefixes = NULL; | |
377 } else { | |
378 // there are prefixes, allocate an array to hold them, and fill it | |
6197 | 379 char** new_prefixes = (char**)os::malloc((prefix_count) * sizeof(char*), mtInternal); |
0 | 380 if (new_prefixes == NULL) { |
381 return JVMTI_ERROR_OUT_OF_MEMORY; | |
382 } | |
383 for (int i = 0; i < prefix_count; i++) { | |
384 char* prefix = prefixes[i]; | |
385 if (prefix == NULL) { | |
386 for (int j = 0; j < (i-1); j++) { | |
387 os::free(new_prefixes[j]); | |
388 } | |
389 os::free(new_prefixes); | |
390 return JVMTI_ERROR_NULL_POINTER; | |
391 } | |
392 prefix = os::strdup(prefixes[i]); | |
393 if (prefix == NULL) { | |
394 for (int j = 0; j < (i-1); j++) { | |
395 os::free(new_prefixes[j]); | |
396 } | |
397 os::free(new_prefixes); | |
398 return JVMTI_ERROR_OUT_OF_MEMORY; | |
399 } | |
400 new_prefixes[i] = prefix; | |
401 } | |
402 _native_method_prefix_count = prefix_count; | |
403 _native_method_prefixes = new_prefixes; | |
404 } | |
405 | |
406 // now that we know the new prefixes have been successfully installed we can | |
407 // safely remove the old ones | |
408 if (old_prefix_count != 0) { | |
409 for (int i = 0; i < old_prefix_count; i++) { | |
410 os::free(old_prefixes[i]); | |
411 } | |
412 os::free(old_prefixes); | |
413 } | |
414 | |
415 return JVMTI_ERROR_NONE; | |
416 } | |
417 | |
418 | |
419 // Collect all the prefixes which have been set in any JVM TI environments | |
420 // by the SetNativeMethodPrefix(es) functions. Be sure to maintain the | |
421 // order of environments and the order of prefixes within each environment. | |
422 // Return in a resource allocated array. | |
423 char** | |
424 JvmtiEnvBase::get_all_native_method_prefixes(int* count_ptr) { | |
425 assert(Threads::number_of_threads() == 0 || | |
426 SafepointSynchronize::is_at_safepoint() || | |
427 JvmtiThreadState_lock->is_locked(), | |
428 "sanity check"); | |
429 | |
430 int total_count = 0; | |
431 GrowableArray<char*>* prefix_array =new GrowableArray<char*>(5); | |
432 | |
433 JvmtiEnvIterator it; | |
434 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
435 int prefix_count = env->get_native_method_prefix_count(); | |
436 char** prefixes = env->get_native_method_prefixes(); | |
437 for (int j = 0; j < prefix_count; j++) { | |
438 // retrieve a prefix and so that it is safe against asynchronous changes | |
439 // copy it into the resource area | |
440 char* prefix = prefixes[j]; | |
441 char* prefix_copy = NEW_RESOURCE_ARRAY(char, strlen(prefix)+1); | |
442 strcpy(prefix_copy, prefix); | |
443 prefix_array->at_put_grow(total_count++, prefix_copy); | |
444 } | |
445 } | |
446 | |
447 char** all_prefixes = NEW_RESOURCE_ARRAY(char*, total_count); | |
448 char** p = all_prefixes; | |
449 for (int i = 0; i < total_count; ++i) { | |
450 *p++ = prefix_array->at(i); | |
451 } | |
452 *count_ptr = total_count; | |
453 return all_prefixes; | |
454 } | |
455 | |
456 void | |
457 JvmtiEnvBase::set_event_callbacks(const jvmtiEventCallbacks* callbacks, | |
458 jint size_of_callbacks) { | |
459 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
460 | |
461 size_t byte_cnt = sizeof(jvmtiEventCallbacks); | |
462 | |
463 // clear in either case to be sure we got any gap between sizes | |
464 memset(&_event_callbacks, 0, byte_cnt); | |
465 | |
466 // Now that JvmtiThreadState_lock is held, prevent a possible race condition where events | |
467 // are re-enabled by a call to set event callbacks where the DisposeEnvironment | |
468 // occurs after the boiler-plate environment check and before the lock is acquired. | |
469 if (callbacks != NULL && is_valid()) { | |
470 if (size_of_callbacks < (jint)byte_cnt) { | |
471 byte_cnt = size_of_callbacks; | |
472 } | |
473 memcpy(&_event_callbacks, callbacks, byte_cnt); | |
474 } | |
475 } | |
476 | |
477 // Called from JVMTI entry points which perform stack walking. If the | |
478 // associated JavaThread is the current thread, then wait_for_suspend | |
479 // is not used. Otherwise, it determines if we should wait for the | |
480 // "other" thread to complete external suspension. (NOTE: in future | |
481 // releases the suspension mechanism should be reimplemented so this | |
482 // is not necessary.) | |
483 // | |
484 bool | |
485 JvmtiEnvBase::is_thread_fully_suspended(JavaThread* thr, bool wait_for_suspend, uint32_t *bits) { | |
486 // "other" threads require special handling | |
487 if (thr != JavaThread::current()) { | |
488 if (wait_for_suspend) { | |
489 // We are allowed to wait for the external suspend to complete | |
490 // so give the other thread a chance to get suspended. | |
491 if (!thr->wait_for_ext_suspend_completion(SuspendRetryCount, | |
492 SuspendRetryDelay, bits)) { | |
493 // didn't make it so let the caller know | |
494 return false; | |
495 } | |
496 } | |
497 // We aren't allowed to wait for the external suspend to complete | |
498 // so if the other thread isn't externally suspended we need to | |
499 // let the caller know. | |
500 else if (!thr->is_ext_suspend_completed_with_lock(bits)) { | |
501 return false; | |
502 } | |
503 } | |
504 | |
505 return true; | |
506 } | |
507 | |
508 | |
509 // In the fullness of time, all users of the method should instead | |
510 // directly use allocate, besides being cleaner and faster, this will | |
511 // mean much better out of memory handling | |
512 unsigned char * | |
513 JvmtiEnvBase::jvmtiMalloc(jlong size) { | |
514 unsigned char* mem; | |
515 jvmtiError result = allocate(size, &mem); | |
516 assert(result == JVMTI_ERROR_NONE, "Allocate failed"); | |
517 return mem; | |
518 } | |
519 | |
520 | |
521 // | |
522 // Threads | |
523 // | |
524 | |
525 jobject * | |
526 JvmtiEnvBase::new_jobjectArray(int length, Handle *handles) { | |
527 if (length == 0) { | |
528 return NULL; | |
529 } | |
530 | |
531 jobject *objArray = (jobject *) jvmtiMalloc(sizeof(jobject) * length); | |
532 NULL_CHECK(objArray, NULL); | |
533 | |
534 for (int i=0; i<length; i++) { | |
535 objArray[i] = jni_reference(handles[i]); | |
536 } | |
537 return objArray; | |
538 } | |
539 | |
540 jthread * | |
541 JvmtiEnvBase::new_jthreadArray(int length, Handle *handles) { | |
542 return (jthread *) new_jobjectArray(length,handles); | |
543 } | |
544 | |
545 jthreadGroup * | |
546 JvmtiEnvBase::new_jthreadGroupArray(int length, Handle *handles) { | |
547 return (jthreadGroup *) new_jobjectArray(length,handles); | |
548 } | |
549 | |
550 | |
551 JavaThread * | |
552 JvmtiEnvBase::get_JavaThread(jthread jni_thread) { | |
553 oop t = JNIHandles::resolve_external_guard(jni_thread); | |
1142 | 554 if (t == NULL || !t->is_a(SystemDictionary::Thread_klass())) { |
0 | 555 return NULL; |
556 } | |
557 // The following returns NULL if the thread has not yet run or is in | |
558 // process of exiting | |
559 return java_lang_Thread::thread(t); | |
560 } | |
561 | |
562 | |
563 // return the vframe on the specified thread and depth, NULL if no such frame | |
564 vframe* | |
565 JvmtiEnvBase::vframeFor(JavaThread* java_thread, jint depth) { | |
566 if (!java_thread->has_last_Java_frame()) { | |
567 return NULL; | |
568 } | |
569 RegisterMap reg_map(java_thread); | |
570 vframe *vf = java_thread->last_java_vframe(®_map); | |
571 int d = 0; | |
572 while ((vf != NULL) && (d < depth)) { | |
573 vf = vf->java_sender(); | |
574 d++; | |
575 } | |
576 return vf; | |
577 } | |
578 | |
579 | |
580 // | |
581 // utilities: JNI objects | |
582 // | |
583 | |
584 | |
585 jclass | |
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586 JvmtiEnvBase::get_jni_class_non_null(Klass* k) { |
0 | 587 assert(k != NULL, "k != NULL"); |
6983 | 588 return (jclass)jni_reference(k->java_mirror()); |
0 | 589 } |
590 | |
591 // | |
592 // Field Information | |
593 // | |
594 | |
595 bool | |
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596 JvmtiEnvBase::get_field_descriptor(Klass* k, jfieldID field, fieldDescriptor* fd) { |
0 | 597 if (!jfieldIDWorkaround::is_valid_jfieldID(k, field)) { |
598 return false; | |
599 } | |
600 bool found = false; | |
601 if (jfieldIDWorkaround::is_static_jfieldID(field)) { | |
602 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(field); | |
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603 found = id->find_local_field(fd); |
0 | 604 } else { |
605 // Non-static field. The fieldID is really the offset of the field within the object. | |
606 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, field); | |
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607 found = InstanceKlass::cast(k)->find_field_from_offset(offset, false, fd); |
0 | 608 } |
609 return found; | |
610 } | |
611 | |
612 // | |
613 // Object Monitor Information | |
614 // | |
615 | |
616 // | |
617 // Count the number of objects for a lightweight monitor. The hobj | |
618 // parameter is object that owns the monitor so this routine will | |
619 // count the number of times the same object was locked by frames | |
620 // in java_thread. | |
621 // | |
622 jint | |
623 JvmtiEnvBase::count_locked_objects(JavaThread *java_thread, Handle hobj) { | |
624 jint ret = 0; | |
625 if (!java_thread->has_last_Java_frame()) { | |
626 return ret; // no Java frames so no monitors | |
627 } | |
628 | |
629 ResourceMark rm; | |
630 HandleMark hm; | |
631 RegisterMap reg_map(java_thread); | |
632 | |
633 for(javaVFrame *jvf=java_thread->last_java_vframe(®_map); jvf != NULL; | |
634 jvf = jvf->java_sender()) { | |
635 GrowableArray<MonitorInfo*>* mons = jvf->monitors(); | |
636 if (!mons->is_empty()) { | |
637 for (int i = 0; i < mons->length(); i++) { | |
638 MonitorInfo *mi = mons->at(i); | |
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639 if (mi->owner_is_scalar_replaced()) continue; |
0 | 640 |
641 // see if owner of the monitor is our object | |
642 if (mi->owner() != NULL && mi->owner() == hobj()) { | |
643 ret++; | |
644 } | |
645 } | |
646 } | |
647 } | |
648 return ret; | |
649 } | |
650 | |
651 | |
652 | |
653 jvmtiError | |
654 JvmtiEnvBase::get_current_contended_monitor(JavaThread *calling_thread, JavaThread *java_thread, jobject *monitor_ptr) { | |
655 #ifdef ASSERT | |
656 uint32_t debug_bits = 0; | |
657 #endif | |
658 assert((SafepointSynchronize::is_at_safepoint() || | |
659 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
660 "at safepoint or target thread is suspended"); | |
661 oop obj = NULL; | |
662 ObjectMonitor *mon = java_thread->current_waiting_monitor(); | |
663 if (mon == NULL) { | |
664 // thread is not doing an Object.wait() call | |
665 mon = java_thread->current_pending_monitor(); | |
666 if (mon != NULL) { | |
667 // The thread is trying to enter() or raw_enter() an ObjectMonitor. | |
668 obj = (oop)mon->object(); | |
669 // If obj == NULL, then ObjectMonitor is raw which doesn't count | |
670 // as contended for this API | |
671 } | |
672 // implied else: no contended ObjectMonitor | |
673 } else { | |
674 // thread is doing an Object.wait() call | |
675 obj = (oop)mon->object(); | |
676 assert(obj != NULL, "Object.wait() should have an object"); | |
677 } | |
678 | |
679 if (obj == NULL) { | |
680 *monitor_ptr = NULL; | |
681 } else { | |
682 HandleMark hm; | |
683 Handle hobj(obj); | |
684 *monitor_ptr = jni_reference(calling_thread, hobj); | |
685 } | |
686 return JVMTI_ERROR_NONE; | |
687 } | |
688 | |
689 | |
690 jvmtiError | |
691 JvmtiEnvBase::get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread, | |
692 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list) { | |
693 jvmtiError err = JVMTI_ERROR_NONE; | |
694 #ifdef ASSERT | |
695 uint32_t debug_bits = 0; | |
696 #endif | |
697 assert((SafepointSynchronize::is_at_safepoint() || | |
698 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
699 "at safepoint or target thread is suspended"); | |
700 | |
701 if (java_thread->has_last_Java_frame()) { | |
702 ResourceMark rm; | |
703 HandleMark hm; | |
704 RegisterMap reg_map(java_thread); | |
705 | |
706 int depth = 0; | |
707 for (javaVFrame *jvf = java_thread->last_java_vframe(®_map); jvf != NULL; | |
708 jvf = jvf->java_sender()) { | |
709 if (depth++ < MaxJavaStackTraceDepth) { // check for stack too deep | |
710 // add locked objects for this frame into list | |
711 err = get_locked_objects_in_frame(calling_thread, java_thread, jvf, owned_monitors_list, depth-1); | |
712 if (err != JVMTI_ERROR_NONE) { | |
713 return err; | |
714 } | |
715 } | |
716 } | |
717 } | |
718 | |
719 // Get off stack monitors. (e.g. acquired via jni MonitorEnter). | |
720 JvmtiMonitorClosure jmc(java_thread, calling_thread, owned_monitors_list, this); | |
721 ObjectSynchronizer::monitors_iterate(&jmc); | |
722 err = jmc.error(); | |
723 | |
724 return err; | |
725 } | |
726 | |
727 // Save JNI local handles for any objects that this frame owns. | |
728 jvmtiError | |
729 JvmtiEnvBase::get_locked_objects_in_frame(JavaThread* calling_thread, JavaThread* java_thread, | |
730 javaVFrame *jvf, GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, int stack_depth) { | |
731 jvmtiError err = JVMTI_ERROR_NONE; | |
732 ResourceMark rm; | |
733 | |
734 GrowableArray<MonitorInfo*>* mons = jvf->monitors(); | |
735 if (mons->is_empty()) { | |
736 return err; // this javaVFrame holds no monitors | |
737 } | |
738 | |
739 HandleMark hm; | |
740 oop wait_obj = NULL; | |
741 { | |
742 // save object of current wait() call (if any) for later comparison | |
743 ObjectMonitor *mon = java_thread->current_waiting_monitor(); | |
744 if (mon != NULL) { | |
745 wait_obj = (oop)mon->object(); | |
746 } | |
747 } | |
748 oop pending_obj = NULL; | |
749 { | |
750 // save object of current enter() call (if any) for later comparison | |
751 ObjectMonitor *mon = java_thread->current_pending_monitor(); | |
752 if (mon != NULL) { | |
753 pending_obj = (oop)mon->object(); | |
754 } | |
755 } | |
756 | |
757 for (int i = 0; i < mons->length(); i++) { | |
758 MonitorInfo *mi = mons->at(i); | |
759 | |
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760 if (mi->owner_is_scalar_replaced()) continue; |
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761 |
0 | 762 oop obj = mi->owner(); |
763 if (obj == NULL) { | |
764 // this monitor doesn't have an owning object so skip it | |
765 continue; | |
766 } | |
767 | |
768 if (wait_obj == obj) { | |
769 // the thread is waiting on this monitor so it isn't really owned | |
770 continue; | |
771 } | |
772 | |
773 if (pending_obj == obj) { | |
774 // the thread is pending on this monitor so it isn't really owned | |
775 continue; | |
776 } | |
777 | |
778 if (owned_monitors_list->length() > 0) { | |
779 // Our list has at least one object on it so we have to check | |
780 // for recursive object locking | |
781 bool found = false; | |
782 for (int j = 0; j < owned_monitors_list->length(); j++) { | |
783 jobject jobj = ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(j))->monitor; | |
784 oop check = JNIHandles::resolve(jobj); | |
785 if (check == obj) { | |
786 found = true; // we found the object | |
787 break; | |
788 } | |
789 } | |
790 | |
791 if (found) { | |
792 // already have this object so don't include it | |
793 continue; | |
794 } | |
795 } | |
796 | |
797 // add the owning object to our list | |
798 jvmtiMonitorStackDepthInfo *jmsdi; | |
799 err = allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); | |
800 if (err != JVMTI_ERROR_NONE) { | |
801 return err; | |
802 } | |
803 Handle hobj(obj); | |
804 jmsdi->monitor = jni_reference(calling_thread, hobj); | |
805 jmsdi->stack_depth = stack_depth; | |
806 owned_monitors_list->append(jmsdi); | |
807 } | |
808 | |
809 return err; | |
810 } | |
811 | |
812 jvmtiError | |
813 JvmtiEnvBase::get_stack_trace(JavaThread *java_thread, | |
814 jint start_depth, jint max_count, | |
815 jvmtiFrameInfo* frame_buffer, jint* count_ptr) { | |
816 #ifdef ASSERT | |
817 uint32_t debug_bits = 0; | |
818 #endif | |
819 assert((SafepointSynchronize::is_at_safepoint() || | |
820 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
821 "at safepoint or target thread is suspended"); | |
822 int count = 0; | |
823 if (java_thread->has_last_Java_frame()) { | |
824 RegisterMap reg_map(java_thread); | |
825 Thread* current_thread = Thread::current(); | |
826 ResourceMark rm(current_thread); | |
827 javaVFrame *jvf = java_thread->last_java_vframe(®_map); | |
828 HandleMark hm(current_thread); | |
829 if (start_depth != 0) { | |
830 if (start_depth > 0) { | |
831 for (int j = 0; j < start_depth && jvf != NULL; j++) { | |
832 jvf = jvf->java_sender(); | |
833 } | |
834 if (jvf == NULL) { | |
835 // start_depth is deeper than the stack depth | |
836 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
837 } | |
838 } else { // start_depth < 0 | |
839 // we are referencing the starting depth based on the oldest | |
840 // part of the stack. | |
841 // optimize to limit the number of times that java_sender() is called | |
842 javaVFrame *jvf_cursor = jvf; | |
843 javaVFrame *jvf_prev = NULL; | |
844 javaVFrame *jvf_prev_prev; | |
845 int j = 0; | |
846 while (jvf_cursor != NULL) { | |
847 jvf_prev_prev = jvf_prev; | |
848 jvf_prev = jvf_cursor; | |
849 for (j = 0; j > start_depth && jvf_cursor != NULL; j--) { | |
850 jvf_cursor = jvf_cursor->java_sender(); | |
851 } | |
852 } | |
853 if (j == start_depth) { | |
854 // previous pointer is exactly where we want to start | |
855 jvf = jvf_prev; | |
856 } else { | |
857 // we need to back up further to get to the right place | |
858 if (jvf_prev_prev == NULL) { | |
859 // the -start_depth is greater than the stack depth | |
860 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
861 } | |
862 // j now is the number of frames on the stack starting with | |
863 // jvf_prev, we start from jvf_prev_prev and move older on | |
864 // the stack that many, the result is -start_depth frames | |
865 // remaining. | |
866 jvf = jvf_prev_prev; | |
867 for (; j < 0; j++) { | |
868 jvf = jvf->java_sender(); | |
869 } | |
870 } | |
871 } | |
872 } | |
873 for (; count < max_count && jvf != NULL; count++) { | |
874 frame_buffer[count].method = jvf->method()->jmethod_id(); | |
875 frame_buffer[count].location = (jvf->method()->is_native() ? -1 : jvf->bci()); | |
876 jvf = jvf->java_sender(); | |
877 } | |
878 } else { | |
879 if (start_depth != 0) { | |
880 // no frames and there is a starting depth | |
881 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
882 } | |
883 } | |
884 *count_ptr = count; | |
885 return JVMTI_ERROR_NONE; | |
886 } | |
887 | |
888 jvmtiError | |
889 JvmtiEnvBase::get_frame_count(JvmtiThreadState *state, jint *count_ptr) { | |
890 assert((state != NULL), | |
891 "JavaThread should create JvmtiThreadState before calling this method"); | |
892 *count_ptr = state->count_frames(); | |
893 return JVMTI_ERROR_NONE; | |
894 } | |
895 | |
896 jvmtiError | |
897 JvmtiEnvBase::get_frame_location(JavaThread *java_thread, jint depth, | |
898 jmethodID* method_ptr, jlocation* location_ptr) { | |
899 #ifdef ASSERT | |
900 uint32_t debug_bits = 0; | |
901 #endif | |
902 assert((SafepointSynchronize::is_at_safepoint() || | |
903 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
904 "at safepoint or target thread is suspended"); | |
905 Thread* current_thread = Thread::current(); | |
906 ResourceMark rm(current_thread); | |
907 | |
908 vframe *vf = vframeFor(java_thread, depth); | |
909 if (vf == NULL) { | |
910 return JVMTI_ERROR_NO_MORE_FRAMES; | |
911 } | |
912 | |
913 // vframeFor should return a java frame. If it doesn't | |
914 // it means we've got an internal error and we return the | |
915 // error in product mode. In debug mode we will instead | |
916 // attempt to cast the vframe to a javaVFrame and will | |
917 // cause an assertion/crash to allow further diagnosis. | |
918 #ifdef PRODUCT | |
919 if (!vf->is_java_frame()) { | |
920 return JVMTI_ERROR_INTERNAL; | |
921 } | |
922 #endif | |
923 | |
924 HandleMark hm(current_thread); | |
925 javaVFrame *jvf = javaVFrame::cast(vf); | |
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926 Method* method = jvf->method(); |
0 | 927 if (method->is_native()) { |
928 *location_ptr = -1; | |
929 } else { | |
930 *location_ptr = jvf->bci(); | |
931 } | |
932 *method_ptr = method->jmethod_id(); | |
933 | |
934 return JVMTI_ERROR_NONE; | |
935 } | |
936 | |
937 | |
938 jvmtiError | |
939 JvmtiEnvBase::get_object_monitor_usage(JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) { | |
940 HandleMark hm; | |
941 Handle hobj; | |
942 | |
943 bool at_safepoint = SafepointSynchronize::is_at_safepoint(); | |
944 | |
945 // Check arguments | |
946 { | |
947 oop mirror = JNIHandles::resolve_external_guard(object); | |
948 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT); | |
949 NULL_CHECK(info_ptr, JVMTI_ERROR_NULL_POINTER); | |
950 | |
951 hobj = Handle(mirror); | |
952 } | |
953 | |
954 JavaThread *owning_thread = NULL; | |
955 ObjectMonitor *mon = NULL; | |
956 jvmtiMonitorUsage ret = { | |
957 NULL, 0, 0, NULL, 0, NULL | |
958 }; | |
959 | |
960 uint32_t debug_bits = 0; | |
961 // first derive the object's owner and entry_count (if any) | |
962 { | |
963 // Revoke any biases before querying the mark word | |
964 if (SafepointSynchronize::is_at_safepoint()) { | |
965 BiasedLocking::revoke_at_safepoint(hobj); | |
966 } else { | |
967 BiasedLocking::revoke_and_rebias(hobj, false, calling_thread); | |
968 } | |
969 | |
970 address owner = NULL; | |
971 { | |
972 markOop mark = hobj()->mark(); | |
973 | |
974 if (!mark->has_monitor()) { | |
975 // this object has a lightweight monitor | |
976 | |
977 if (mark->has_locker()) { | |
978 owner = (address)mark->locker(); // save the address of the Lock word | |
979 } | |
980 // implied else: no owner | |
981 } else { | |
982 // this object has a heavyweight monitor | |
983 mon = mark->monitor(); | |
984 | |
985 // The owner field of a heavyweight monitor may be NULL for no | |
986 // owner, a JavaThread * or it may still be the address of the | |
987 // Lock word in a JavaThread's stack. A monitor can be inflated | |
988 // by a non-owning JavaThread, but only the owning JavaThread | |
989 // can change the owner field from the Lock word to the | |
990 // JavaThread * and it may not have done that yet. | |
991 owner = (address)mon->owner(); | |
992 } | |
993 } | |
994 | |
995 if (owner != NULL) { | |
996 // This monitor is owned so we have to find the owning JavaThread. | |
997 // Since owning_thread_from_monitor_owner() grabs a lock, GC can | |
998 // move our object at this point. However, our owner value is safe | |
999 // since it is either the Lock word on a stack or a JavaThread *. | |
1000 owning_thread = Threads::owning_thread_from_monitor_owner(owner, !at_safepoint); | |
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1001 // Cannot assume (owning_thread != NULL) here because this function |
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1002 // may not have been called at a safepoint and the owning_thread |
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1003 // might not be suspended. |
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1004 if (owning_thread != NULL) { |
0 | 1005 // The monitor's owner either has to be the current thread, at safepoint |
1006 // or it has to be suspended. Any of these conditions will prevent both | |
1007 // contending and waiting threads from modifying the state of | |
1008 // the monitor. | |
1009 if (!at_safepoint && !JvmtiEnv::is_thread_fully_suspended(owning_thread, true, &debug_bits)) { | |
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1010 // Don't worry! This return of JVMTI_ERROR_THREAD_NOT_SUSPENDED |
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1011 // will not make it back to the JVM/TI agent. The error code will |
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1012 // get intercepted in JvmtiEnv::GetObjectMonitorUsage() which |
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1013 // will retry the call via a VM_GetObjectMonitorUsage VM op. |
0 | 1014 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; |
1015 } | |
1016 HandleMark hm; | |
1017 Handle th(owning_thread->threadObj()); | |
1018 ret.owner = (jthread)jni_reference(calling_thread, th); | |
1019 } | |
1020 // implied else: no owner | |
1021 } | |
1022 | |
1023 if (owning_thread != NULL) { // monitor is owned | |
1024 if ((address)owning_thread == owner) { | |
1025 // the owner field is the JavaThread * | |
1026 assert(mon != NULL, | |
1027 "must have heavyweight monitor with JavaThread * owner"); | |
1028 ret.entry_count = mon->recursions() + 1; | |
1029 } else { | |
1030 // The owner field is the Lock word on the JavaThread's stack | |
1031 // so the recursions field is not valid. We have to count the | |
1032 // number of recursive monitor entries the hard way. We pass | |
1033 // a handle to survive any GCs along the way. | |
1034 ResourceMark rm; | |
1035 ret.entry_count = count_locked_objects(owning_thread, hobj); | |
1036 } | |
1037 } | |
1038 // implied else: entry_count == 0 | |
1039 } | |
1040 | |
1041 int nWant,nWait; | |
1042 if (mon != NULL) { | |
1043 // this object has a heavyweight monitor | |
1044 nWant = mon->contentions(); // # of threads contending for monitor | |
1045 nWait = mon->waiters(); // # of threads in Object.wait() | |
1046 ret.waiter_count = nWant + nWait; | |
1047 ret.notify_waiter_count = nWait; | |
1048 } else { | |
1049 // this object has a lightweight monitor | |
1050 ret.waiter_count = 0; | |
1051 ret.notify_waiter_count = 0; | |
1052 } | |
1053 | |
1054 // Allocate memory for heavyweight and lightweight monitor. | |
1055 jvmtiError err; | |
1056 err = allocate(ret.waiter_count * sizeof(jthread *), (unsigned char**)&ret.waiters); | |
1057 if (err != JVMTI_ERROR_NONE) { | |
1058 return err; | |
1059 } | |
1060 err = allocate(ret.notify_waiter_count * sizeof(jthread *), | |
1061 (unsigned char**)&ret.notify_waiters); | |
1062 if (err != JVMTI_ERROR_NONE) { | |
1063 deallocate((unsigned char*)ret.waiters); | |
1064 return err; | |
1065 } | |
1066 | |
1067 // now derive the rest of the fields | |
1068 if (mon != NULL) { | |
1069 // this object has a heavyweight monitor | |
1070 | |
1071 // Number of waiters may actually be less than the waiter count. | |
1072 // So NULL out memory so that unused memory will be NULL. | |
1073 memset(ret.waiters, 0, ret.waiter_count * sizeof(jthread *)); | |
1074 memset(ret.notify_waiters, 0, ret.notify_waiter_count * sizeof(jthread *)); | |
1075 | |
1076 if (ret.waiter_count > 0) { | |
1077 // we have contending and/or waiting threads | |
1078 HandleMark hm; | |
1079 if (nWant > 0) { | |
1080 // we have contending threads | |
1081 ResourceMark rm; | |
1082 // get_pending_threads returns only java thread so we do not need to | |
1083 // check for non java threads. | |
1084 GrowableArray<JavaThread*>* wantList = Threads::get_pending_threads( | |
1085 nWant, (address)mon, !at_safepoint); | |
1086 if (wantList->length() < nWant) { | |
1087 // robustness: the pending list has gotten smaller | |
1088 nWant = wantList->length(); | |
1089 } | |
1090 for (int i = 0; i < nWant; i++) { | |
1091 JavaThread *pending_thread = wantList->at(i); | |
1092 // If the monitor has no owner, then a non-suspended contending | |
1093 // thread could potentially change the state of the monitor by | |
1094 // entering it. The JVM/TI spec doesn't allow this. | |
1095 if (owning_thread == NULL && !at_safepoint & | |
1096 !JvmtiEnv::is_thread_fully_suspended(pending_thread, true, &debug_bits)) { | |
1097 if (ret.owner != NULL) { | |
1098 destroy_jni_reference(calling_thread, ret.owner); | |
1099 } | |
1100 for (int j = 0; j < i; j++) { | |
1101 destroy_jni_reference(calling_thread, ret.waiters[j]); | |
1102 } | |
1103 deallocate((unsigned char*)ret.waiters); | |
1104 deallocate((unsigned char*)ret.notify_waiters); | |
1105 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
1106 } | |
1107 Handle th(pending_thread->threadObj()); | |
1108 ret.waiters[i] = (jthread)jni_reference(calling_thread, th); | |
1109 } | |
1110 } | |
1111 if (nWait > 0) { | |
1112 // we have threads in Object.wait() | |
1113 int offset = nWant; // add after any contending threads | |
1114 ObjectWaiter *waiter = mon->first_waiter(); | |
1115 for (int i = 0, j = 0; i < nWait; i++) { | |
1116 if (waiter == NULL) { | |
1117 // robustness: the waiting list has gotten smaller | |
1118 nWait = j; | |
1119 break; | |
1120 } | |
1121 Thread *t = mon->thread_of_waiter(waiter); | |
1122 if (t != NULL && t->is_Java_thread()) { | |
1123 JavaThread *wjava_thread = (JavaThread *)t; | |
1124 // If the thread was found on the ObjectWaiter list, then | |
1125 // it has not been notified. This thread can't change the | |
1126 // state of the monitor so it doesn't need to be suspended. | |
1127 Handle th(wjava_thread->threadObj()); | |
1128 ret.waiters[offset + j] = (jthread)jni_reference(calling_thread, th); | |
1129 ret.notify_waiters[j++] = (jthread)jni_reference(calling_thread, th); | |
1130 } | |
1131 waiter = mon->next_waiter(waiter); | |
1132 } | |
1133 } | |
1134 } | |
1135 | |
1136 // Adjust count. nWant and nWait count values may be less than original. | |
1137 ret.waiter_count = nWant + nWait; | |
1138 ret.notify_waiter_count = nWait; | |
1139 } else { | |
1140 // this object has a lightweight monitor and we have nothing more | |
1141 // to do here because the defaults are just fine. | |
1142 } | |
1143 | |
1144 // we don't update return parameter unless everything worked | |
1145 *info_ptr = ret; | |
1146 | |
1147 return JVMTI_ERROR_NONE; | |
1148 } | |
1149 | |
1150 ResourceTracker::ResourceTracker(JvmtiEnv* env) { | |
1151 _env = env; | |
6197 | 1152 _allocations = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<unsigned char*>(20, true); |
0 | 1153 _failed = false; |
1154 } | |
1155 ResourceTracker::~ResourceTracker() { | |
1156 if (_failed) { | |
1157 for (int i=0; i<_allocations->length(); i++) { | |
1158 _env->deallocate(_allocations->at(i)); | |
1159 } | |
1160 } | |
1161 delete _allocations; | |
1162 } | |
1163 | |
1164 jvmtiError ResourceTracker::allocate(jlong size, unsigned char** mem_ptr) { | |
1165 unsigned char *ptr; | |
1166 jvmtiError err = _env->allocate(size, &ptr); | |
1167 if (err == JVMTI_ERROR_NONE) { | |
1168 _allocations->append(ptr); | |
1169 *mem_ptr = ptr; | |
1170 } else { | |
1171 *mem_ptr = NULL; | |
1172 _failed = true; | |
1173 } | |
1174 return err; | |
1175 } | |
1176 | |
1177 unsigned char* ResourceTracker::allocate(jlong size) { | |
1178 unsigned char* ptr; | |
1179 allocate(size, &ptr); | |
1180 return ptr; | |
1181 } | |
1182 | |
1183 char* ResourceTracker::strdup(const char* str) { | |
1184 char *dup_str = (char*)allocate(strlen(str)+1); | |
1185 if (dup_str != NULL) { | |
1186 strcpy(dup_str, str); | |
1187 } | |
1188 return dup_str; | |
1189 } | |
1190 | |
1191 struct StackInfoNode { | |
1192 struct StackInfoNode *next; | |
1193 jvmtiStackInfo info; | |
1194 }; | |
1195 | |
1196 // Create a jvmtiStackInfo inside a linked list node and create a | |
1197 // buffer for the frame information, both allocated as resource objects. | |
1198 // Fill in both the jvmtiStackInfo and the jvmtiFrameInfo. | |
1199 // Note that either or both of thr and thread_oop | |
1200 // may be null if the thread is new or has exited. | |
1201 void | |
1202 VM_GetMultipleStackTraces::fill_frames(jthread jt, JavaThread *thr, oop thread_oop) { | |
1203 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1204 | |
1205 jint state = 0; | |
1206 struct StackInfoNode *node = NEW_RESOURCE_OBJ(struct StackInfoNode); | |
1207 jvmtiStackInfo *infop = &(node->info); | |
1208 node->next = head(); | |
1209 set_head(node); | |
1210 infop->frame_count = 0; | |
1211 infop->thread = jt; | |
1212 | |
1213 if (thread_oop != NULL) { | |
1214 // get most state bits | |
1215 state = (jint)java_lang_Thread::get_thread_status(thread_oop); | |
1216 } | |
1217 | |
1218 if (thr != NULL) { // add more state bits if there is a JavaThead to query | |
1219 // same as is_being_ext_suspended() but without locking | |
1220 if (thr->is_ext_suspended() || thr->is_external_suspend()) { | |
1221 state |= JVMTI_THREAD_STATE_SUSPENDED; | |
1222 } | |
1223 JavaThreadState jts = thr->thread_state(); | |
1224 if (jts == _thread_in_native) { | |
1225 state |= JVMTI_THREAD_STATE_IN_NATIVE; | |
1226 } | |
1227 OSThread* osThread = thr->osthread(); | |
1228 if (osThread != NULL && osThread->interrupted()) { | |
1229 state |= JVMTI_THREAD_STATE_INTERRUPTED; | |
1230 } | |
1231 } | |
1232 infop->state = state; | |
1233 | |
1234 if (thr != NULL || (state & JVMTI_THREAD_STATE_ALIVE) != 0) { | |
1235 infop->frame_buffer = NEW_RESOURCE_ARRAY(jvmtiFrameInfo, max_frame_count()); | |
1236 env()->get_stack_trace(thr, 0, max_frame_count(), | |
1237 infop->frame_buffer, &(infop->frame_count)); | |
1238 } else { | |
1239 infop->frame_buffer = NULL; | |
1240 infop->frame_count = 0; | |
1241 } | |
1242 _frame_count_total += infop->frame_count; | |
1243 } | |
1244 | |
1245 // Based on the stack information in the linked list, allocate memory | |
1246 // block to return and fill it from the info in the linked list. | |
1247 void | |
1248 VM_GetMultipleStackTraces::allocate_and_fill_stacks(jint thread_count) { | |
1249 // do I need to worry about alignment issues? | |
1250 jlong alloc_size = thread_count * sizeof(jvmtiStackInfo) | |
1251 + _frame_count_total * sizeof(jvmtiFrameInfo); | |
1252 env()->allocate(alloc_size, (unsigned char **)&_stack_info); | |
1253 | |
1254 // pointers to move through the newly allocated space as it is filled in | |
1255 jvmtiStackInfo *si = _stack_info + thread_count; // bottom of stack info | |
1256 jvmtiFrameInfo *fi = (jvmtiFrameInfo *)si; // is the top of frame info | |
1257 | |
1258 // copy information in resource area into allocated buffer | |
1259 // insert stack info backwards since linked list is backwards | |
1260 // insert frame info forwards | |
1261 // walk the StackInfoNodes | |
1262 for (struct StackInfoNode *sin = head(); sin != NULL; sin = sin->next) { | |
1263 jint frame_count = sin->info.frame_count; | |
1264 size_t frames_size = frame_count * sizeof(jvmtiFrameInfo); | |
1265 --si; | |
1266 memcpy(si, &(sin->info), sizeof(jvmtiStackInfo)); | |
1267 if (frames_size == 0) { | |
1268 si->frame_buffer = NULL; | |
1269 } else { | |
1270 memcpy(fi, sin->info.frame_buffer, frames_size); | |
1271 si->frame_buffer = fi; // point to the new allocated copy of the frames | |
1272 fi += frame_count; | |
1273 } | |
1274 } | |
1275 assert(si == _stack_info, "the last copied stack info must be the first record"); | |
1276 assert((unsigned char *)fi == ((unsigned char *)_stack_info) + alloc_size, | |
1277 "the last copied frame info must be the last record"); | |
1278 } | |
1279 | |
1280 | |
1281 void | |
1282 VM_GetThreadListStackTraces::doit() { | |
1283 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1284 | |
1285 ResourceMark rm; | |
1286 for (int i = 0; i < _thread_count; ++i) { | |
1287 jthread jt = _thread_list[i]; | |
1288 oop thread_oop = JNIHandles::resolve_external_guard(jt); | |
1142 | 1289 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) { |
0 | 1290 set_result(JVMTI_ERROR_INVALID_THREAD); |
1291 return; | |
1292 } | |
1293 fill_frames(jt, java_lang_Thread::thread(thread_oop), thread_oop); | |
1294 } | |
1295 allocate_and_fill_stacks(_thread_count); | |
1296 } | |
1297 | |
1298 void | |
1299 VM_GetAllStackTraces::doit() { | |
1300 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1301 | |
1302 ResourceMark rm; | |
1303 _final_thread_count = 0; | |
1304 for (JavaThread *jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
1305 oop thread_oop = jt->threadObj(); | |
1306 if (thread_oop != NULL && | |
1307 !jt->is_exiting() && | |
1308 java_lang_Thread::is_alive(thread_oop) && | |
1309 !jt->is_hidden_from_external_view()) { | |
1310 ++_final_thread_count; | |
1311 // Handle block of the calling thread is used to create local refs. | |
1312 fill_frames((jthread)JNIHandles::make_local(_calling_thread, thread_oop), | |
1313 jt, thread_oop); | |
1314 } | |
1315 } | |
1316 allocate_and_fill_stacks(_final_thread_count); | |
1317 } | |
1318 | |
1319 // Verifies that the top frame is a java frame in an expected state. | |
1320 // Deoptimizes frame if needed. | |
1321 // Checks that the frame method signature matches the return type (tos). | |
1322 // HandleMark must be defined in the caller only. | |
1323 // It is to keep a ret_ob_h handle alive after return to the caller. | |
1324 jvmtiError | |
1325 JvmtiEnvBase::check_top_frame(JavaThread* current_thread, JavaThread* java_thread, | |
1326 jvalue value, TosState tos, Handle* ret_ob_h) { | |
1327 ResourceMark rm(current_thread); | |
1328 | |
1329 vframe *vf = vframeFor(java_thread, 0); | |
1330 NULL_CHECK(vf, JVMTI_ERROR_NO_MORE_FRAMES); | |
1331 | |
1332 javaVFrame *jvf = (javaVFrame*) vf; | |
1333 if (!vf->is_java_frame() || jvf->method()->is_native()) { | |
1334 return JVMTI_ERROR_OPAQUE_FRAME; | |
1335 } | |
1336 | |
1337 // If the frame is a compiled one, need to deoptimize it. | |
1338 if (vf->is_compiled_frame()) { | |
1339 if (!vf->fr().can_be_deoptimized()) { | |
1340 return JVMTI_ERROR_OPAQUE_FRAME; | |
1341 } | |
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1342 Deoptimization::deoptimize_frame(java_thread, jvf->fr().id()); |
0 | 1343 } |
1344 | |
1345 // Get information about method return type | |
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1346 Symbol* signature = jvf->method()->signature(); |
0 | 1347 |
1348 ResultTypeFinder rtf(signature); | |
1349 TosState fr_tos = as_TosState(rtf.type()); | |
1350 if (fr_tos != tos) { | |
1351 if (tos != itos || (fr_tos != btos && fr_tos != ctos && fr_tos != stos)) { | |
1352 return JVMTI_ERROR_TYPE_MISMATCH; | |
1353 } | |
1354 } | |
1355 | |
1356 // Check that the jobject class matches the return type signature. | |
1357 jobject jobj = value.l; | |
1358 if (tos == atos && jobj != NULL) { // NULL reference is allowed | |
1359 Handle ob_h = Handle(current_thread, JNIHandles::resolve_external_guard(jobj)); | |
1360 NULL_CHECK(ob_h, JVMTI_ERROR_INVALID_OBJECT); | |
1361 KlassHandle ob_kh = KlassHandle(current_thread, ob_h()->klass()); | |
1362 NULL_CHECK(ob_kh, JVMTI_ERROR_INVALID_OBJECT); | |
1363 | |
1364 // Method return type signature. | |
1365 char* ty_sign = 1 + strchr(signature->as_C_string(), ')'); | |
1366 | |
6983 | 1367 if (!VM_GetOrSetLocal::is_assignable(ty_sign, ob_kh(), current_thread)) { |
0 | 1368 return JVMTI_ERROR_TYPE_MISMATCH; |
1369 } | |
1370 *ret_ob_h = ob_h; | |
1371 } | |
1372 return JVMTI_ERROR_NONE; | |
1373 } /* end check_top_frame */ | |
1374 | |
1375 | |
1376 // ForceEarlyReturn<type> follows the PopFrame approach in many aspects. | |
1377 // Main difference is on the last stage in the interpreter. | |
1378 // The PopFrame stops method execution to continue execution | |
1379 // from the same method call instruction. | |
1380 // The ForceEarlyReturn forces return from method so the execution | |
1381 // continues at the bytecode following the method call. | |
1382 | |
1383 // Threads_lock NOT held, java_thread not protected by lock | |
1384 // java_thread - pre-checked | |
1385 | |
1386 jvmtiError | |
1387 JvmtiEnvBase::force_early_return(JavaThread* java_thread, jvalue value, TosState tos) { | |
1388 JavaThread* current_thread = JavaThread::current(); | |
1389 HandleMark hm(current_thread); | |
1390 uint32_t debug_bits = 0; | |
1391 | |
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1392 // retrieve or create the state |
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1393 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); |
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1394 if (state == NULL) { |
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1395 return JVMTI_ERROR_THREAD_NOT_ALIVE; |
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1396 } |
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1397 |
0 | 1398 // Check if java_thread is fully suspended |
1399 if (!is_thread_fully_suspended(java_thread, | |
1400 true /* wait for suspend completion */, | |
1401 &debug_bits)) { | |
1402 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
1403 } | |
1404 | |
1405 // Check to see if a ForceEarlyReturn was already in progress | |
1406 if (state->is_earlyret_pending()) { | |
1407 // Probably possible for JVMTI clients to trigger this, but the | |
1408 // JPDA backend shouldn't allow this to happen | |
1409 return JVMTI_ERROR_INTERNAL; | |
1410 } | |
1411 { | |
1412 // The same as for PopFrame. Workaround bug: | |
1413 // 4812902: popFrame hangs if the method is waiting at a synchronize | |
1414 // Catch this condition and return an error to avoid hanging. | |
1415 // Now JVMTI spec allows an implementation to bail out with an opaque | |
1416 // frame error. | |
1417 OSThread* osThread = java_thread->osthread(); | |
1418 if (osThread->get_state() == MONITOR_WAIT) { | |
1419 return JVMTI_ERROR_OPAQUE_FRAME; | |
1420 } | |
1421 } | |
1422 Handle ret_ob_h = Handle(); | |
1423 jvmtiError err = check_top_frame(current_thread, java_thread, value, tos, &ret_ob_h); | |
1424 if (err != JVMTI_ERROR_NONE) { | |
1425 return err; | |
1426 } | |
1427 assert(tos != atos || value.l == NULL || ret_ob_h() != NULL, | |
1428 "return object oop must not be NULL if jobject is not NULL"); | |
1429 | |
1430 // Update the thread state to reflect that the top frame must be | |
1431 // forced to return. | |
1432 // The current frame will be returned later when the suspended | |
1433 // thread is resumed and right before returning from VM to Java. | |
1434 // (see call_VM_base() in assembler_<cpu>.cpp). | |
1435 | |
1436 state->set_earlyret_pending(); | |
1437 state->set_earlyret_oop(ret_ob_h()); | |
1438 state->set_earlyret_value(value, tos); | |
1439 | |
1440 // Set pending step flag for this early return. | |
1441 // It is cleared when next step event is posted. | |
1442 state->set_pending_step_for_earlyret(); | |
1443 | |
1444 return JVMTI_ERROR_NONE; | |
1445 } /* end force_early_return */ | |
1446 | |
1447 void | |
1448 JvmtiMonitorClosure::do_monitor(ObjectMonitor* mon) { | |
1449 if ( _error != JVMTI_ERROR_NONE) { | |
1450 // Error occurred in previous iteration so no need to add | |
1451 // to the list. | |
1452 return; | |
1453 } | |
1454 if (mon->owner() == _java_thread ) { | |
1455 // Filter out on stack monitors collected during stack walk. | |
1456 oop obj = (oop)mon->object(); | |
1457 bool found = false; | |
1458 for (int j = 0; j < _owned_monitors_list->length(); j++) { | |
1459 jobject jobj = ((jvmtiMonitorStackDepthInfo*)_owned_monitors_list->at(j))->monitor; | |
1460 oop check = JNIHandles::resolve(jobj); | |
1461 if (check == obj) { | |
1462 // On stack monitor already collected during the stack walk. | |
1463 found = true; | |
1464 break; | |
1465 } | |
1466 } | |
1467 if (found == false) { | |
1468 // This is off stack monitor (e.g. acquired via jni MonitorEnter). | |
1469 jvmtiError err; | |
1470 jvmtiMonitorStackDepthInfo *jmsdi; | |
1471 err = _env->allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); | |
1472 if (err != JVMTI_ERROR_NONE) { | |
1473 _error = err; | |
1474 return; | |
1475 } | |
1476 Handle hobj(obj); | |
1477 jmsdi->monitor = _env->jni_reference(_calling_thread, hobj); | |
1478 // stack depth is unknown for this monitor. | |
1479 jmsdi->stack_depth = -1; | |
1480 _owned_monitors_list->append(jmsdi); | |
1481 } | |
1482 } | |
1483 } |