Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiEnvBase.cpp @ 611:2f716c0acb64
6567360: 3/4 SIGBUS in jvmti RawMonitor magic check for unaligned bad monitor pointer
Summary: Change JvmtiEnvBase::is_valid() and JvmtiRawMonitor::is_valid() to fetch the _magic fields via Bytes::get_native_u[248]().
Reviewed-by: coleenp, swamyv
| author | dcubed |
|---|---|
| date | Mon, 02 Mar 2009 14:05:07 -0700 |
| parents | ea20d7ce26b0 |
| children | b109e761e927 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 470 | 2 * Copyright 2003-2008 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 # include "incls/_precompiled.incl" | |
| 25 # include "incls/_jvmtiEnvBase.cpp.incl" | |
| 26 | |
| 27 | |
| 28 /////////////////////////////////////////////////////////////// | |
| 29 // | |
| 30 // JvmtiEnvBase | |
| 31 // | |
| 32 | |
| 33 JvmtiEnvBase* JvmtiEnvBase::_head_environment = NULL; | |
| 34 | |
| 35 bool JvmtiEnvBase::_globally_initialized = false; | |
| 36 volatile bool JvmtiEnvBase::_needs_clean_up = false; | |
| 37 | |
| 38 jvmtiPhase JvmtiEnvBase::_phase = JVMTI_PHASE_PRIMORDIAL; | |
| 39 | |
| 40 volatile int JvmtiEnvBase::_dying_thread_env_iteration_count = 0; | |
| 41 | |
| 42 extern jvmtiInterface_1_ jvmti_Interface; | |
| 43 extern jvmtiInterface_1_ jvmtiTrace_Interface; | |
| 44 | |
| 45 | |
| 46 // perform initializations that must occur before any JVMTI environments | |
| 47 // are released but which should only be initialized once (no matter | |
| 48 // how many environments are created). | |
| 49 void | |
| 50 JvmtiEnvBase::globally_initialize() { | |
| 51 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
| 52 assert(_globally_initialized == false, "bad call"); | |
| 53 | |
| 54 JvmtiManageCapabilities::initialize(); | |
| 55 | |
| 56 #ifndef JVMTI_KERNEL | |
| 57 // register extension functions and events | |
| 58 JvmtiExtensions::register_extensions(); | |
| 59 #endif // !JVMTI_KERNEL | |
| 60 | |
| 61 #ifdef JVMTI_TRACE | |
| 62 JvmtiTrace::initialize(); | |
| 63 #endif | |
| 64 | |
| 65 _globally_initialized = true; | |
| 66 } | |
| 67 | |
| 68 | |
| 69 void | |
| 70 JvmtiEnvBase::initialize() { | |
| 71 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
| 72 | |
| 73 // Add this environment to the end of the environment list (order is important) | |
| 74 { | |
| 75 // This block of code must not contain any safepoints, as list deallocation | |
| 76 // (which occurs at a safepoint) cannot occur simultaneously with this list | |
| 77 // addition. Note: No_Safepoint_Verifier cannot, currently, be used before | |
| 78 // threads exist. | |
| 79 JvmtiEnvIterator it; | |
| 80 JvmtiEnvBase *previous_env = NULL; | |
| 81 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
| 82 previous_env = env; | |
| 83 } | |
| 84 if (previous_env == NULL) { | |
| 85 _head_environment = this; | |
| 86 } else { | |
| 87 previous_env->set_next_environment(this); | |
| 88 } | |
| 89 } | |
| 90 | |
| 91 if (_globally_initialized == false) { | |
| 92 globally_initialize(); | |
| 93 } | |
| 94 } | |
| 95 | |
| 96 | |
|
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97 bool |
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98 JvmtiEnvBase::is_valid() { |
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99 jint value = 0; |
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100 |
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101 // This object might not be a JvmtiEnvBase so we can't assume |
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102 // the _magic field is properly aligned. Get the value in a safe |
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103 // way and then check against JVMTI_MAGIC. |
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104 |
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105 switch (sizeof(_magic)) { |
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106 case 2: |
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107 value = Bytes::get_native_u2((address)&_magic); |
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108 break; |
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109 |
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110 case 4: |
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111 value = Bytes::get_native_u4((address)&_magic); |
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112 break; |
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113 |
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114 case 8: |
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115 value = Bytes::get_native_u8((address)&_magic); |
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116 break; |
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117 |
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118 default: |
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119 guarantee(false, "_magic field is an unexpected size"); |
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120 } |
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121 |
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122 return value == JVMTI_MAGIC; |
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123 } |
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124 |
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125 |
| 0 | 126 JvmtiEnvBase::JvmtiEnvBase() : _env_event_enable() { |
| 127 _env_local_storage = NULL; | |
| 128 _tag_map = NULL; | |
| 129 _native_method_prefix_count = 0; | |
| 130 _native_method_prefixes = NULL; | |
| 131 _next = NULL; | |
| 132 _class_file_load_hook_ever_enabled = false; | |
| 133 | |
| 134 // Moot since ClassFileLoadHook not yet enabled. | |
| 135 // But "true" will give a more predictable ClassFileLoadHook behavior | |
| 136 // for environment creation during ClassFileLoadHook. | |
| 137 _is_retransformable = true; | |
| 138 | |
| 139 // all callbacks initially NULL | |
| 140 memset(&_event_callbacks,0,sizeof(jvmtiEventCallbacks)); | |
| 141 | |
| 142 // all capabilities initially off | |
| 143 memset(&_current_capabilities, 0, sizeof(_current_capabilities)); | |
| 144 | |
| 145 // all prohibited capabilities initially off | |
| 146 memset(&_prohibited_capabilities, 0, sizeof(_prohibited_capabilities)); | |
| 147 | |
| 148 _magic = JVMTI_MAGIC; | |
| 149 | |
| 150 JvmtiEventController::env_initialize((JvmtiEnv*)this); | |
| 151 | |
| 152 #ifdef JVMTI_TRACE | |
| 371 | 153 _jvmti_external.functions = TraceJVMTI != NULL ? &jvmtiTrace_Interface : &jvmti_Interface; |
| 0 | 154 #else |
| 155 _jvmti_external.functions = &jvmti_Interface; | |
| 156 #endif | |
| 157 } | |
| 158 | |
| 159 | |
| 160 void | |
| 161 JvmtiEnvBase::dispose() { | |
| 162 | |
| 163 #ifdef JVMTI_TRACE | |
| 164 JvmtiTrace::shutdown(); | |
| 165 #endif | |
| 166 | |
| 167 // Dispose of event info and let the event controller call us back | |
| 168 // in a locked state (env_dispose, below) | |
| 169 JvmtiEventController::env_dispose(this); | |
| 170 } | |
| 171 | |
| 172 void | |
| 173 JvmtiEnvBase::env_dispose() { | |
| 174 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
| 175 | |
| 176 // We have been entered with all events disabled on this environment. | |
| 177 // A race to re-enable events (by setting callbacks) is prevented by | |
| 178 // checking for a valid environment when setting callbacks (while | |
| 179 // holding the JvmtiThreadState_lock). | |
| 180 | |
| 181 // Mark as invalid. | |
| 182 _magic = DISPOSED_MAGIC; | |
| 183 | |
| 184 // Relinquish all capabilities. | |
| 185 jvmtiCapabilities *caps = get_capabilities(); | |
| 186 JvmtiManageCapabilities::relinquish_capabilities(caps, caps, caps); | |
| 187 | |
| 188 // Same situation as with events (see above) | |
| 189 set_native_method_prefixes(0, NULL); | |
| 190 | |
| 191 #ifndef JVMTI_KERNEL | |
| 192 JvmtiTagMap* tag_map_to_deallocate = _tag_map; | |
| 193 set_tag_map(NULL); | |
| 194 // A tag map can be big, deallocate it now | |
| 195 if (tag_map_to_deallocate != NULL) { | |
| 196 delete tag_map_to_deallocate; | |
| 197 } | |
| 198 #endif // !JVMTI_KERNEL | |
| 199 | |
| 200 _needs_clean_up = true; | |
| 201 } | |
| 202 | |
| 203 | |
| 204 JvmtiEnvBase::~JvmtiEnvBase() { | |
| 205 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
| 206 | |
| 207 // There is a small window of time during which the tag map of a | |
| 208 // disposed environment could have been reallocated. | |
| 209 // Make sure it is gone. | |
| 210 #ifndef JVMTI_KERNEL | |
| 211 JvmtiTagMap* tag_map_to_deallocate = _tag_map; | |
| 212 set_tag_map(NULL); | |
| 213 // A tag map can be big, deallocate it now | |
| 214 if (tag_map_to_deallocate != NULL) { | |
| 215 delete tag_map_to_deallocate; | |
| 216 } | |
| 217 #endif // !JVMTI_KERNEL | |
| 218 | |
| 219 _magic = BAD_MAGIC; | |
| 220 } | |
| 221 | |
| 222 | |
| 223 void | |
| 224 JvmtiEnvBase::periodic_clean_up() { | |
| 225 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
| 226 | |
| 227 // JvmtiEnvBase reference is saved in JvmtiEnvThreadState. So | |
| 228 // clean up JvmtiThreadState before deleting JvmtiEnv pointer. | |
| 229 JvmtiThreadState::periodic_clean_up(); | |
| 230 | |
| 231 // Unlink all invalid environments from the list of environments | |
| 232 // and deallocate them | |
| 233 JvmtiEnvIterator it; | |
| 234 JvmtiEnvBase* previous_env = NULL; | |
| 235 JvmtiEnvBase* env = it.first(); | |
| 236 while (env != NULL) { | |
| 237 if (env->is_valid()) { | |
| 238 previous_env = env; | |
| 239 env = it.next(env); | |
| 240 } else { | |
| 241 // This one isn't valid, remove it from the list and deallocate it | |
| 242 JvmtiEnvBase* defunct_env = env; | |
| 243 env = it.next(env); | |
| 244 if (previous_env == NULL) { | |
| 245 _head_environment = env; | |
| 246 } else { | |
| 247 previous_env->set_next_environment(env); | |
| 248 } | |
| 249 delete defunct_env; | |
| 250 } | |
| 251 } | |
| 252 | |
| 253 } | |
| 254 | |
| 255 | |
| 256 void | |
| 257 JvmtiEnvBase::check_for_periodic_clean_up() { | |
| 258 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
| 259 | |
| 260 class ThreadInsideIterationClosure: public ThreadClosure { | |
| 261 private: | |
| 262 bool _inside; | |
| 263 public: | |
| 264 ThreadInsideIterationClosure() : _inside(false) {}; | |
| 265 | |
| 266 void do_thread(Thread* thread) { | |
| 267 _inside |= thread->is_inside_jvmti_env_iteration(); | |
| 268 } | |
| 269 | |
| 270 bool is_inside_jvmti_env_iteration() { | |
| 271 return _inside; | |
| 272 } | |
| 273 }; | |
| 274 | |
| 275 if (_needs_clean_up) { | |
| 276 // Check if we are currently iterating environment, | |
| 277 // deallocation should not occur if we are | |
| 278 ThreadInsideIterationClosure tiic; | |
| 279 Threads::threads_do(&tiic); | |
| 280 if (!tiic.is_inside_jvmti_env_iteration() && | |
| 281 !is_inside_dying_thread_env_iteration()) { | |
| 282 _needs_clean_up = false; | |
| 283 JvmtiEnvBase::periodic_clean_up(); | |
| 284 } | |
| 285 } | |
| 286 } | |
| 287 | |
| 288 | |
| 289 void | |
| 290 JvmtiEnvBase::record_first_time_class_file_load_hook_enabled() { | |
| 291 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), | |
| 292 "sanity check"); | |
| 293 | |
| 294 if (!_class_file_load_hook_ever_enabled) { | |
| 295 _class_file_load_hook_ever_enabled = true; | |
| 296 | |
| 297 if (get_capabilities()->can_retransform_classes) { | |
| 298 _is_retransformable = true; | |
| 299 } else { | |
| 300 _is_retransformable = false; | |
| 301 | |
| 302 // cannot add retransform capability after ClassFileLoadHook has been enabled | |
| 303 get_prohibited_capabilities()->can_retransform_classes = 1; | |
| 304 } | |
| 305 } | |
| 306 } | |
| 307 | |
| 308 | |
| 309 void | |
| 310 JvmtiEnvBase::record_class_file_load_hook_enabled() { | |
| 311 if (!_class_file_load_hook_ever_enabled) { | |
| 312 if (Threads::number_of_threads() == 0) { | |
| 313 record_first_time_class_file_load_hook_enabled(); | |
| 314 } else { | |
| 315 MutexLocker mu(JvmtiThreadState_lock); | |
| 316 record_first_time_class_file_load_hook_enabled(); | |
| 317 } | |
| 318 } | |
| 319 } | |
| 320 | |
| 321 | |
| 322 jvmtiError | |
| 323 JvmtiEnvBase::set_native_method_prefixes(jint prefix_count, char** prefixes) { | |
| 324 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), | |
| 325 "sanity check"); | |
| 326 | |
| 327 int old_prefix_count = get_native_method_prefix_count(); | |
| 328 char **old_prefixes = get_native_method_prefixes(); | |
| 329 | |
| 330 // allocate and install the new prefixex | |
| 331 if (prefix_count == 0 || !is_valid()) { | |
| 332 _native_method_prefix_count = 0; | |
| 333 _native_method_prefixes = NULL; | |
| 334 } else { | |
| 335 // there are prefixes, allocate an array to hold them, and fill it | |
| 336 char** new_prefixes = (char**)os::malloc((prefix_count) * sizeof(char*)); | |
| 337 if (new_prefixes == NULL) { | |
| 338 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 339 } | |
| 340 for (int i = 0; i < prefix_count; i++) { | |
| 341 char* prefix = prefixes[i]; | |
| 342 if (prefix == NULL) { | |
| 343 for (int j = 0; j < (i-1); j++) { | |
| 344 os::free(new_prefixes[j]); | |
| 345 } | |
| 346 os::free(new_prefixes); | |
| 347 return JVMTI_ERROR_NULL_POINTER; | |
| 348 } | |
| 349 prefix = os::strdup(prefixes[i]); | |
| 350 if (prefix == NULL) { | |
| 351 for (int j = 0; j < (i-1); j++) { | |
| 352 os::free(new_prefixes[j]); | |
| 353 } | |
| 354 os::free(new_prefixes); | |
| 355 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 356 } | |
| 357 new_prefixes[i] = prefix; | |
| 358 } | |
| 359 _native_method_prefix_count = prefix_count; | |
| 360 _native_method_prefixes = new_prefixes; | |
| 361 } | |
| 362 | |
| 363 // now that we know the new prefixes have been successfully installed we can | |
| 364 // safely remove the old ones | |
| 365 if (old_prefix_count != 0) { | |
| 366 for (int i = 0; i < old_prefix_count; i++) { | |
| 367 os::free(old_prefixes[i]); | |
| 368 } | |
| 369 os::free(old_prefixes); | |
| 370 } | |
| 371 | |
| 372 return JVMTI_ERROR_NONE; | |
| 373 } | |
| 374 | |
| 375 | |
| 376 // Collect all the prefixes which have been set in any JVM TI environments | |
| 377 // by the SetNativeMethodPrefix(es) functions. Be sure to maintain the | |
| 378 // order of environments and the order of prefixes within each environment. | |
| 379 // Return in a resource allocated array. | |
| 380 char** | |
| 381 JvmtiEnvBase::get_all_native_method_prefixes(int* count_ptr) { | |
| 382 assert(Threads::number_of_threads() == 0 || | |
| 383 SafepointSynchronize::is_at_safepoint() || | |
| 384 JvmtiThreadState_lock->is_locked(), | |
| 385 "sanity check"); | |
| 386 | |
| 387 int total_count = 0; | |
| 388 GrowableArray<char*>* prefix_array =new GrowableArray<char*>(5); | |
| 389 | |
| 390 JvmtiEnvIterator it; | |
| 391 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
| 392 int prefix_count = env->get_native_method_prefix_count(); | |
| 393 char** prefixes = env->get_native_method_prefixes(); | |
| 394 for (int j = 0; j < prefix_count; j++) { | |
| 395 // retrieve a prefix and so that it is safe against asynchronous changes | |
| 396 // copy it into the resource area | |
| 397 char* prefix = prefixes[j]; | |
| 398 char* prefix_copy = NEW_RESOURCE_ARRAY(char, strlen(prefix)+1); | |
| 399 strcpy(prefix_copy, prefix); | |
| 400 prefix_array->at_put_grow(total_count++, prefix_copy); | |
| 401 } | |
| 402 } | |
| 403 | |
| 404 char** all_prefixes = NEW_RESOURCE_ARRAY(char*, total_count); | |
| 405 char** p = all_prefixes; | |
| 406 for (int i = 0; i < total_count; ++i) { | |
| 407 *p++ = prefix_array->at(i); | |
| 408 } | |
| 409 *count_ptr = total_count; | |
| 410 return all_prefixes; | |
| 411 } | |
| 412 | |
| 413 void | |
| 414 JvmtiEnvBase::set_event_callbacks(const jvmtiEventCallbacks* callbacks, | |
| 415 jint size_of_callbacks) { | |
| 416 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
| 417 | |
| 418 size_t byte_cnt = sizeof(jvmtiEventCallbacks); | |
| 419 | |
| 420 // clear in either case to be sure we got any gap between sizes | |
| 421 memset(&_event_callbacks, 0, byte_cnt); | |
| 422 | |
| 423 // Now that JvmtiThreadState_lock is held, prevent a possible race condition where events | |
| 424 // are re-enabled by a call to set event callbacks where the DisposeEnvironment | |
| 425 // occurs after the boiler-plate environment check and before the lock is acquired. | |
| 426 if (callbacks != NULL && is_valid()) { | |
| 427 if (size_of_callbacks < (jint)byte_cnt) { | |
| 428 byte_cnt = size_of_callbacks; | |
| 429 } | |
| 430 memcpy(&_event_callbacks, callbacks, byte_cnt); | |
| 431 } | |
| 432 } | |
| 433 | |
| 434 // Called from JVMTI entry points which perform stack walking. If the | |
| 435 // associated JavaThread is the current thread, then wait_for_suspend | |
| 436 // is not used. Otherwise, it determines if we should wait for the | |
| 437 // "other" thread to complete external suspension. (NOTE: in future | |
| 438 // releases the suspension mechanism should be reimplemented so this | |
| 439 // is not necessary.) | |
| 440 // | |
| 441 bool | |
| 442 JvmtiEnvBase::is_thread_fully_suspended(JavaThread* thr, bool wait_for_suspend, uint32_t *bits) { | |
| 443 // "other" threads require special handling | |
| 444 if (thr != JavaThread::current()) { | |
| 445 if (wait_for_suspend) { | |
| 446 // We are allowed to wait for the external suspend to complete | |
| 447 // so give the other thread a chance to get suspended. | |
| 448 if (!thr->wait_for_ext_suspend_completion(SuspendRetryCount, | |
| 449 SuspendRetryDelay, bits)) { | |
| 450 // didn't make it so let the caller know | |
| 451 return false; | |
| 452 } | |
| 453 } | |
| 454 // We aren't allowed to wait for the external suspend to complete | |
| 455 // so if the other thread isn't externally suspended we need to | |
| 456 // let the caller know. | |
| 457 else if (!thr->is_ext_suspend_completed_with_lock(bits)) { | |
| 458 return false; | |
| 459 } | |
| 460 } | |
| 461 | |
| 462 return true; | |
| 463 } | |
| 464 | |
| 465 | |
| 466 // In the fullness of time, all users of the method should instead | |
| 467 // directly use allocate, besides being cleaner and faster, this will | |
| 468 // mean much better out of memory handling | |
| 469 unsigned char * | |
| 470 JvmtiEnvBase::jvmtiMalloc(jlong size) { | |
| 471 unsigned char* mem; | |
| 472 jvmtiError result = allocate(size, &mem); | |
| 473 assert(result == JVMTI_ERROR_NONE, "Allocate failed"); | |
| 474 return mem; | |
| 475 } | |
| 476 | |
| 477 | |
| 478 // | |
| 479 // Threads | |
| 480 // | |
| 481 | |
| 482 jobject * | |
| 483 JvmtiEnvBase::new_jobjectArray(int length, Handle *handles) { | |
| 484 if (length == 0) { | |
| 485 return NULL; | |
| 486 } | |
| 487 | |
| 488 jobject *objArray = (jobject *) jvmtiMalloc(sizeof(jobject) * length); | |
| 489 NULL_CHECK(objArray, NULL); | |
| 490 | |
| 491 for (int i=0; i<length; i++) { | |
| 492 objArray[i] = jni_reference(handles[i]); | |
| 493 } | |
| 494 return objArray; | |
| 495 } | |
| 496 | |
| 497 jthread * | |
| 498 JvmtiEnvBase::new_jthreadArray(int length, Handle *handles) { | |
| 499 return (jthread *) new_jobjectArray(length,handles); | |
| 500 } | |
| 501 | |
| 502 jthreadGroup * | |
| 503 JvmtiEnvBase::new_jthreadGroupArray(int length, Handle *handles) { | |
| 504 return (jthreadGroup *) new_jobjectArray(length,handles); | |
| 505 } | |
| 506 | |
| 507 | |
| 508 JavaThread * | |
| 509 JvmtiEnvBase::get_JavaThread(jthread jni_thread) { | |
| 510 oop t = JNIHandles::resolve_external_guard(jni_thread); | |
| 511 if (t == NULL || !t->is_a(SystemDictionary::thread_klass())) { | |
| 512 return NULL; | |
| 513 } | |
| 514 // The following returns NULL if the thread has not yet run or is in | |
| 515 // process of exiting | |
| 516 return java_lang_Thread::thread(t); | |
| 517 } | |
| 518 | |
| 519 | |
| 520 // update the access_flags for the field in the klass | |
| 521 void | |
| 522 JvmtiEnvBase::update_klass_field_access_flag(fieldDescriptor *fd) { | |
| 523 instanceKlass* ik = instanceKlass::cast(fd->field_holder()); | |
| 524 typeArrayOop fields = ik->fields(); | |
| 525 fields->ushort_at_put(fd->index(), (jushort)fd->access_flags().as_short()); | |
| 526 } | |
| 527 | |
| 528 | |
| 529 // return the vframe on the specified thread and depth, NULL if no such frame | |
| 530 vframe* | |
| 531 JvmtiEnvBase::vframeFor(JavaThread* java_thread, jint depth) { | |
| 532 if (!java_thread->has_last_Java_frame()) { | |
| 533 return NULL; | |
| 534 } | |
| 535 RegisterMap reg_map(java_thread); | |
| 536 vframe *vf = java_thread->last_java_vframe(®_map); | |
| 537 int d = 0; | |
| 538 while ((vf != NULL) && (d < depth)) { | |
| 539 vf = vf->java_sender(); | |
| 540 d++; | |
| 541 } | |
| 542 return vf; | |
| 543 } | |
| 544 | |
| 545 | |
| 546 // | |
| 547 // utilities: JNI objects | |
| 548 // | |
| 549 | |
| 550 | |
| 551 jclass | |
| 552 JvmtiEnvBase::get_jni_class_non_null(klassOop k) { | |
| 553 assert(k != NULL, "k != NULL"); | |
| 554 return (jclass)jni_reference(Klass::cast(k)->java_mirror()); | |
| 555 } | |
| 556 | |
| 557 #ifndef JVMTI_KERNEL | |
| 558 | |
| 559 // | |
| 560 // Field Information | |
| 561 // | |
| 562 | |
| 563 bool | |
| 564 JvmtiEnvBase::get_field_descriptor(klassOop k, jfieldID field, fieldDescriptor* fd) { | |
| 565 if (!jfieldIDWorkaround::is_valid_jfieldID(k, field)) { | |
| 566 return false; | |
| 567 } | |
| 568 bool found = false; | |
| 569 if (jfieldIDWorkaround::is_static_jfieldID(field)) { | |
| 570 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(field); | |
| 571 int offset = id->offset(); | |
| 572 klassOop holder = id->holder(); | |
| 573 found = instanceKlass::cast(holder)->find_local_field_from_offset(offset, true, fd); | |
| 574 } else { | |
| 575 // Non-static field. The fieldID is really the offset of the field within the object. | |
| 576 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, field); | |
| 577 found = instanceKlass::cast(k)->find_field_from_offset(offset, false, fd); | |
| 578 } | |
| 579 return found; | |
| 580 } | |
| 581 | |
| 582 // | |
| 583 // Object Monitor Information | |
| 584 // | |
| 585 | |
| 586 // | |
| 587 // Count the number of objects for a lightweight monitor. The hobj | |
| 588 // parameter is object that owns the monitor so this routine will | |
| 589 // count the number of times the same object was locked by frames | |
| 590 // in java_thread. | |
| 591 // | |
| 592 jint | |
| 593 JvmtiEnvBase::count_locked_objects(JavaThread *java_thread, Handle hobj) { | |
| 594 jint ret = 0; | |
| 595 if (!java_thread->has_last_Java_frame()) { | |
| 596 return ret; // no Java frames so no monitors | |
| 597 } | |
| 598 | |
| 599 ResourceMark rm; | |
| 600 HandleMark hm; | |
| 601 RegisterMap reg_map(java_thread); | |
| 602 | |
| 603 for(javaVFrame *jvf=java_thread->last_java_vframe(®_map); jvf != NULL; | |
| 604 jvf = jvf->java_sender()) { | |
| 605 GrowableArray<MonitorInfo*>* mons = jvf->monitors(); | |
| 606 if (!mons->is_empty()) { | |
| 607 for (int i = 0; i < mons->length(); i++) { | |
| 608 MonitorInfo *mi = mons->at(i); | |
| 609 | |
| 610 // see if owner of the monitor is our object | |
| 611 if (mi->owner() != NULL && mi->owner() == hobj()) { | |
| 612 ret++; | |
| 613 } | |
| 614 } | |
| 615 } | |
| 616 } | |
| 617 return ret; | |
| 618 } | |
| 619 | |
| 620 | |
| 621 | |
| 622 jvmtiError | |
| 623 JvmtiEnvBase::get_current_contended_monitor(JavaThread *calling_thread, JavaThread *java_thread, jobject *monitor_ptr) { | |
| 624 #ifdef ASSERT | |
| 625 uint32_t debug_bits = 0; | |
| 626 #endif | |
| 627 assert((SafepointSynchronize::is_at_safepoint() || | |
| 628 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
| 629 "at safepoint or target thread is suspended"); | |
| 630 oop obj = NULL; | |
| 631 ObjectMonitor *mon = java_thread->current_waiting_monitor(); | |
| 632 if (mon == NULL) { | |
| 633 // thread is not doing an Object.wait() call | |
| 634 mon = java_thread->current_pending_monitor(); | |
| 635 if (mon != NULL) { | |
| 636 // The thread is trying to enter() or raw_enter() an ObjectMonitor. | |
| 637 obj = (oop)mon->object(); | |
| 638 // If obj == NULL, then ObjectMonitor is raw which doesn't count | |
| 639 // as contended for this API | |
| 640 } | |
| 641 // implied else: no contended ObjectMonitor | |
| 642 } else { | |
| 643 // thread is doing an Object.wait() call | |
| 644 obj = (oop)mon->object(); | |
| 645 assert(obj != NULL, "Object.wait() should have an object"); | |
| 646 } | |
| 647 | |
| 648 if (obj == NULL) { | |
| 649 *monitor_ptr = NULL; | |
| 650 } else { | |
| 651 HandleMark hm; | |
| 652 Handle hobj(obj); | |
| 653 *monitor_ptr = jni_reference(calling_thread, hobj); | |
| 654 } | |
| 655 return JVMTI_ERROR_NONE; | |
| 656 } | |
| 657 | |
| 658 | |
| 659 jvmtiError | |
| 660 JvmtiEnvBase::get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread, | |
| 661 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list) { | |
| 662 jvmtiError err = JVMTI_ERROR_NONE; | |
| 663 #ifdef ASSERT | |
| 664 uint32_t debug_bits = 0; | |
| 665 #endif | |
| 666 assert((SafepointSynchronize::is_at_safepoint() || | |
| 667 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
| 668 "at safepoint or target thread is suspended"); | |
| 669 | |
| 670 if (java_thread->has_last_Java_frame()) { | |
| 671 ResourceMark rm; | |
| 672 HandleMark hm; | |
| 673 RegisterMap reg_map(java_thread); | |
| 674 | |
| 675 int depth = 0; | |
| 676 for (javaVFrame *jvf = java_thread->last_java_vframe(®_map); jvf != NULL; | |
| 677 jvf = jvf->java_sender()) { | |
| 678 if (depth++ < MaxJavaStackTraceDepth) { // check for stack too deep | |
| 679 // add locked objects for this frame into list | |
| 680 err = get_locked_objects_in_frame(calling_thread, java_thread, jvf, owned_monitors_list, depth-1); | |
| 681 if (err != JVMTI_ERROR_NONE) { | |
| 682 return err; | |
| 683 } | |
| 684 } | |
| 685 } | |
| 686 } | |
| 687 | |
| 688 // Get off stack monitors. (e.g. acquired via jni MonitorEnter). | |
| 689 JvmtiMonitorClosure jmc(java_thread, calling_thread, owned_monitors_list, this); | |
| 690 ObjectSynchronizer::monitors_iterate(&jmc); | |
| 691 err = jmc.error(); | |
| 692 | |
| 693 return err; | |
| 694 } | |
| 695 | |
| 696 // Save JNI local handles for any objects that this frame owns. | |
| 697 jvmtiError | |
| 698 JvmtiEnvBase::get_locked_objects_in_frame(JavaThread* calling_thread, JavaThread* java_thread, | |
| 699 javaVFrame *jvf, GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, int stack_depth) { | |
| 700 jvmtiError err = JVMTI_ERROR_NONE; | |
| 701 ResourceMark rm; | |
| 702 | |
| 703 GrowableArray<MonitorInfo*>* mons = jvf->monitors(); | |
| 704 if (mons->is_empty()) { | |
| 705 return err; // this javaVFrame holds no monitors | |
| 706 } | |
| 707 | |
| 708 HandleMark hm; | |
| 709 oop wait_obj = NULL; | |
| 710 { | |
| 711 // save object of current wait() call (if any) for later comparison | |
| 712 ObjectMonitor *mon = java_thread->current_waiting_monitor(); | |
| 713 if (mon != NULL) { | |
| 714 wait_obj = (oop)mon->object(); | |
| 715 } | |
| 716 } | |
| 717 oop pending_obj = NULL; | |
| 718 { | |
| 719 // save object of current enter() call (if any) for later comparison | |
| 720 ObjectMonitor *mon = java_thread->current_pending_monitor(); | |
| 721 if (mon != NULL) { | |
| 722 pending_obj = (oop)mon->object(); | |
| 723 } | |
| 724 } | |
| 725 | |
| 726 for (int i = 0; i < mons->length(); i++) { | |
| 727 MonitorInfo *mi = mons->at(i); | |
| 728 | |
| 729 oop obj = mi->owner(); | |
| 730 if (obj == NULL) { | |
| 731 // this monitor doesn't have an owning object so skip it | |
| 732 continue; | |
| 733 } | |
| 734 | |
| 735 if (wait_obj == obj) { | |
| 736 // the thread is waiting on this monitor so it isn't really owned | |
| 737 continue; | |
| 738 } | |
| 739 | |
| 740 if (pending_obj == obj) { | |
| 741 // the thread is pending on this monitor so it isn't really owned | |
| 742 continue; | |
| 743 } | |
| 744 | |
| 745 if (owned_monitors_list->length() > 0) { | |
| 746 // Our list has at least one object on it so we have to check | |
| 747 // for recursive object locking | |
| 748 bool found = false; | |
| 749 for (int j = 0; j < owned_monitors_list->length(); j++) { | |
| 750 jobject jobj = ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(j))->monitor; | |
| 751 oop check = JNIHandles::resolve(jobj); | |
| 752 if (check == obj) { | |
| 753 found = true; // we found the object | |
| 754 break; | |
| 755 } | |
| 756 } | |
| 757 | |
| 758 if (found) { | |
| 759 // already have this object so don't include it | |
| 760 continue; | |
| 761 } | |
| 762 } | |
| 763 | |
| 764 // add the owning object to our list | |
| 765 jvmtiMonitorStackDepthInfo *jmsdi; | |
| 766 err = allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); | |
| 767 if (err != JVMTI_ERROR_NONE) { | |
| 768 return err; | |
| 769 } | |
| 770 Handle hobj(obj); | |
| 771 jmsdi->monitor = jni_reference(calling_thread, hobj); | |
| 772 jmsdi->stack_depth = stack_depth; | |
| 773 owned_monitors_list->append(jmsdi); | |
| 774 } | |
| 775 | |
| 776 return err; | |
| 777 } | |
| 778 | |
| 779 jvmtiError | |
| 780 JvmtiEnvBase::get_stack_trace(JavaThread *java_thread, | |
| 781 jint start_depth, jint max_count, | |
| 782 jvmtiFrameInfo* frame_buffer, jint* count_ptr) { | |
| 783 #ifdef ASSERT | |
| 784 uint32_t debug_bits = 0; | |
| 785 #endif | |
| 786 assert((SafepointSynchronize::is_at_safepoint() || | |
| 787 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
| 788 "at safepoint or target thread is suspended"); | |
| 789 int count = 0; | |
| 790 if (java_thread->has_last_Java_frame()) { | |
| 791 RegisterMap reg_map(java_thread); | |
| 792 Thread* current_thread = Thread::current(); | |
| 793 ResourceMark rm(current_thread); | |
| 794 javaVFrame *jvf = java_thread->last_java_vframe(®_map); | |
| 795 HandleMark hm(current_thread); | |
| 796 if (start_depth != 0) { | |
| 797 if (start_depth > 0) { | |
| 798 for (int j = 0; j < start_depth && jvf != NULL; j++) { | |
| 799 jvf = jvf->java_sender(); | |
| 800 } | |
| 801 if (jvf == NULL) { | |
| 802 // start_depth is deeper than the stack depth | |
| 803 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
| 804 } | |
| 805 } else { // start_depth < 0 | |
| 806 // we are referencing the starting depth based on the oldest | |
| 807 // part of the stack. | |
| 808 // optimize to limit the number of times that java_sender() is called | |
| 809 javaVFrame *jvf_cursor = jvf; | |
| 810 javaVFrame *jvf_prev = NULL; | |
| 811 javaVFrame *jvf_prev_prev; | |
| 812 int j = 0; | |
| 813 while (jvf_cursor != NULL) { | |
| 814 jvf_prev_prev = jvf_prev; | |
| 815 jvf_prev = jvf_cursor; | |
| 816 for (j = 0; j > start_depth && jvf_cursor != NULL; j--) { | |
| 817 jvf_cursor = jvf_cursor->java_sender(); | |
| 818 } | |
| 819 } | |
| 820 if (j == start_depth) { | |
| 821 // previous pointer is exactly where we want to start | |
| 822 jvf = jvf_prev; | |
| 823 } else { | |
| 824 // we need to back up further to get to the right place | |
| 825 if (jvf_prev_prev == NULL) { | |
| 826 // the -start_depth is greater than the stack depth | |
| 827 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
| 828 } | |
| 829 // j now is the number of frames on the stack starting with | |
| 830 // jvf_prev, we start from jvf_prev_prev and move older on | |
| 831 // the stack that many, the result is -start_depth frames | |
| 832 // remaining. | |
| 833 jvf = jvf_prev_prev; | |
| 834 for (; j < 0; j++) { | |
| 835 jvf = jvf->java_sender(); | |
| 836 } | |
| 837 } | |
| 838 } | |
| 839 } | |
| 840 for (; count < max_count && jvf != NULL; count++) { | |
| 841 frame_buffer[count].method = jvf->method()->jmethod_id(); | |
| 842 frame_buffer[count].location = (jvf->method()->is_native() ? -1 : jvf->bci()); | |
| 843 jvf = jvf->java_sender(); | |
| 844 } | |
| 845 } else { | |
| 846 if (start_depth != 0) { | |
| 847 // no frames and there is a starting depth | |
| 848 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
| 849 } | |
| 850 } | |
| 851 *count_ptr = count; | |
| 852 return JVMTI_ERROR_NONE; | |
| 853 } | |
| 854 | |
| 855 jvmtiError | |
| 856 JvmtiEnvBase::get_frame_count(JvmtiThreadState *state, jint *count_ptr) { | |
| 857 assert((state != NULL), | |
| 858 "JavaThread should create JvmtiThreadState before calling this method"); | |
| 859 *count_ptr = state->count_frames(); | |
| 860 return JVMTI_ERROR_NONE; | |
| 861 } | |
| 862 | |
| 863 jvmtiError | |
| 864 JvmtiEnvBase::get_frame_location(JavaThread *java_thread, jint depth, | |
| 865 jmethodID* method_ptr, jlocation* location_ptr) { | |
| 866 #ifdef ASSERT | |
| 867 uint32_t debug_bits = 0; | |
| 868 #endif | |
| 869 assert((SafepointSynchronize::is_at_safepoint() || | |
| 870 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
| 871 "at safepoint or target thread is suspended"); | |
| 872 Thread* current_thread = Thread::current(); | |
| 873 ResourceMark rm(current_thread); | |
| 874 | |
| 875 vframe *vf = vframeFor(java_thread, depth); | |
| 876 if (vf == NULL) { | |
| 877 return JVMTI_ERROR_NO_MORE_FRAMES; | |
| 878 } | |
| 879 | |
| 880 // vframeFor should return a java frame. If it doesn't | |
| 881 // it means we've got an internal error and we return the | |
| 882 // error in product mode. In debug mode we will instead | |
| 883 // attempt to cast the vframe to a javaVFrame and will | |
| 884 // cause an assertion/crash to allow further diagnosis. | |
| 885 #ifdef PRODUCT | |
| 886 if (!vf->is_java_frame()) { | |
| 887 return JVMTI_ERROR_INTERNAL; | |
| 888 } | |
| 889 #endif | |
| 890 | |
| 891 HandleMark hm(current_thread); | |
| 892 javaVFrame *jvf = javaVFrame::cast(vf); | |
| 893 methodOop method = jvf->method(); | |
| 894 if (method->is_native()) { | |
| 895 *location_ptr = -1; | |
| 896 } else { | |
| 897 *location_ptr = jvf->bci(); | |
| 898 } | |
| 899 *method_ptr = method->jmethod_id(); | |
| 900 | |
| 901 return JVMTI_ERROR_NONE; | |
| 902 } | |
| 903 | |
| 904 | |
| 905 jvmtiError | |
| 906 JvmtiEnvBase::get_object_monitor_usage(JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) { | |
| 907 HandleMark hm; | |
| 908 Handle hobj; | |
| 909 | |
| 910 bool at_safepoint = SafepointSynchronize::is_at_safepoint(); | |
| 911 | |
| 912 // Check arguments | |
| 913 { | |
| 914 oop mirror = JNIHandles::resolve_external_guard(object); | |
| 915 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT); | |
| 916 NULL_CHECK(info_ptr, JVMTI_ERROR_NULL_POINTER); | |
| 917 | |
| 918 hobj = Handle(mirror); | |
| 919 } | |
| 920 | |
| 921 JavaThread *owning_thread = NULL; | |
| 922 ObjectMonitor *mon = NULL; | |
| 923 jvmtiMonitorUsage ret = { | |
| 924 NULL, 0, 0, NULL, 0, NULL | |
| 925 }; | |
| 926 | |
| 927 uint32_t debug_bits = 0; | |
| 928 // first derive the object's owner and entry_count (if any) | |
| 929 { | |
| 930 // Revoke any biases before querying the mark word | |
| 931 if (SafepointSynchronize::is_at_safepoint()) { | |
| 932 BiasedLocking::revoke_at_safepoint(hobj); | |
| 933 } else { | |
| 934 BiasedLocking::revoke_and_rebias(hobj, false, calling_thread); | |
| 935 } | |
| 936 | |
| 937 address owner = NULL; | |
| 938 { | |
| 939 markOop mark = hobj()->mark(); | |
| 940 | |
| 941 if (!mark->has_monitor()) { | |
| 942 // this object has a lightweight monitor | |
| 943 | |
| 944 if (mark->has_locker()) { | |
| 945 owner = (address)mark->locker(); // save the address of the Lock word | |
| 946 } | |
| 947 // implied else: no owner | |
| 948 } else { | |
| 949 // this object has a heavyweight monitor | |
| 950 mon = mark->monitor(); | |
| 951 | |
| 952 // The owner field of a heavyweight monitor may be NULL for no | |
| 953 // owner, a JavaThread * or it may still be the address of the | |
| 954 // Lock word in a JavaThread's stack. A monitor can be inflated | |
| 955 // by a non-owning JavaThread, but only the owning JavaThread | |
| 956 // can change the owner field from the Lock word to the | |
| 957 // JavaThread * and it may not have done that yet. | |
| 958 owner = (address)mon->owner(); | |
| 959 } | |
| 960 } | |
| 961 | |
| 962 if (owner != NULL) { | |
| 963 // This monitor is owned so we have to find the owning JavaThread. | |
| 964 // Since owning_thread_from_monitor_owner() grabs a lock, GC can | |
| 965 // move our object at this point. However, our owner value is safe | |
| 966 // since it is either the Lock word on a stack or a JavaThread *. | |
| 967 owning_thread = Threads::owning_thread_from_monitor_owner(owner, !at_safepoint); | |
| 968 assert(owning_thread != NULL, "sanity check"); | |
| 969 if (owning_thread != NULL) { // robustness | |
| 970 // The monitor's owner either has to be the current thread, at safepoint | |
| 971 // or it has to be suspended. Any of these conditions will prevent both | |
| 972 // contending and waiting threads from modifying the state of | |
| 973 // the monitor. | |
| 974 if (!at_safepoint && !JvmtiEnv::is_thread_fully_suspended(owning_thread, true, &debug_bits)) { | |
| 975 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
| 976 } | |
| 977 HandleMark hm; | |
| 978 Handle th(owning_thread->threadObj()); | |
| 979 ret.owner = (jthread)jni_reference(calling_thread, th); | |
| 980 } | |
| 981 // implied else: no owner | |
| 982 } | |
| 983 | |
| 984 if (owning_thread != NULL) { // monitor is owned | |
| 985 if ((address)owning_thread == owner) { | |
| 986 // the owner field is the JavaThread * | |
| 987 assert(mon != NULL, | |
| 988 "must have heavyweight monitor with JavaThread * owner"); | |
| 989 ret.entry_count = mon->recursions() + 1; | |
| 990 } else { | |
| 991 // The owner field is the Lock word on the JavaThread's stack | |
| 992 // so the recursions field is not valid. We have to count the | |
| 993 // number of recursive monitor entries the hard way. We pass | |
| 994 // a handle to survive any GCs along the way. | |
| 995 ResourceMark rm; | |
| 996 ret.entry_count = count_locked_objects(owning_thread, hobj); | |
| 997 } | |
| 998 } | |
| 999 // implied else: entry_count == 0 | |
| 1000 } | |
| 1001 | |
| 1002 int nWant,nWait; | |
| 1003 if (mon != NULL) { | |
| 1004 // this object has a heavyweight monitor | |
| 1005 nWant = mon->contentions(); // # of threads contending for monitor | |
| 1006 nWait = mon->waiters(); // # of threads in Object.wait() | |
| 1007 ret.waiter_count = nWant + nWait; | |
| 1008 ret.notify_waiter_count = nWait; | |
| 1009 } else { | |
| 1010 // this object has a lightweight monitor | |
| 1011 ret.waiter_count = 0; | |
| 1012 ret.notify_waiter_count = 0; | |
| 1013 } | |
| 1014 | |
| 1015 // Allocate memory for heavyweight and lightweight monitor. | |
| 1016 jvmtiError err; | |
| 1017 err = allocate(ret.waiter_count * sizeof(jthread *), (unsigned char**)&ret.waiters); | |
| 1018 if (err != JVMTI_ERROR_NONE) { | |
| 1019 return err; | |
| 1020 } | |
| 1021 err = allocate(ret.notify_waiter_count * sizeof(jthread *), | |
| 1022 (unsigned char**)&ret.notify_waiters); | |
| 1023 if (err != JVMTI_ERROR_NONE) { | |
| 1024 deallocate((unsigned char*)ret.waiters); | |
| 1025 return err; | |
| 1026 } | |
| 1027 | |
| 1028 // now derive the rest of the fields | |
| 1029 if (mon != NULL) { | |
| 1030 // this object has a heavyweight monitor | |
| 1031 | |
| 1032 // Number of waiters may actually be less than the waiter count. | |
| 1033 // So NULL out memory so that unused memory will be NULL. | |
| 1034 memset(ret.waiters, 0, ret.waiter_count * sizeof(jthread *)); | |
| 1035 memset(ret.notify_waiters, 0, ret.notify_waiter_count * sizeof(jthread *)); | |
| 1036 | |
| 1037 if (ret.waiter_count > 0) { | |
| 1038 // we have contending and/or waiting threads | |
| 1039 HandleMark hm; | |
| 1040 if (nWant > 0) { | |
| 1041 // we have contending threads | |
| 1042 ResourceMark rm; | |
| 1043 // get_pending_threads returns only java thread so we do not need to | |
| 1044 // check for non java threads. | |
| 1045 GrowableArray<JavaThread*>* wantList = Threads::get_pending_threads( | |
| 1046 nWant, (address)mon, !at_safepoint); | |
| 1047 if (wantList->length() < nWant) { | |
| 1048 // robustness: the pending list has gotten smaller | |
| 1049 nWant = wantList->length(); | |
| 1050 } | |
| 1051 for (int i = 0; i < nWant; i++) { | |
| 1052 JavaThread *pending_thread = wantList->at(i); | |
| 1053 // If the monitor has no owner, then a non-suspended contending | |
| 1054 // thread could potentially change the state of the monitor by | |
| 1055 // entering it. The JVM/TI spec doesn't allow this. | |
| 1056 if (owning_thread == NULL && !at_safepoint & | |
| 1057 !JvmtiEnv::is_thread_fully_suspended(pending_thread, true, &debug_bits)) { | |
| 1058 if (ret.owner != NULL) { | |
| 1059 destroy_jni_reference(calling_thread, ret.owner); | |
| 1060 } | |
| 1061 for (int j = 0; j < i; j++) { | |
| 1062 destroy_jni_reference(calling_thread, ret.waiters[j]); | |
| 1063 } | |
| 1064 deallocate((unsigned char*)ret.waiters); | |
| 1065 deallocate((unsigned char*)ret.notify_waiters); | |
| 1066 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
| 1067 } | |
| 1068 Handle th(pending_thread->threadObj()); | |
| 1069 ret.waiters[i] = (jthread)jni_reference(calling_thread, th); | |
| 1070 } | |
| 1071 } | |
| 1072 if (nWait > 0) { | |
| 1073 // we have threads in Object.wait() | |
| 1074 int offset = nWant; // add after any contending threads | |
| 1075 ObjectWaiter *waiter = mon->first_waiter(); | |
| 1076 for (int i = 0, j = 0; i < nWait; i++) { | |
| 1077 if (waiter == NULL) { | |
| 1078 // robustness: the waiting list has gotten smaller | |
| 1079 nWait = j; | |
| 1080 break; | |
| 1081 } | |
| 1082 Thread *t = mon->thread_of_waiter(waiter); | |
| 1083 if (t != NULL && t->is_Java_thread()) { | |
| 1084 JavaThread *wjava_thread = (JavaThread *)t; | |
| 1085 // If the thread was found on the ObjectWaiter list, then | |
| 1086 // it has not been notified. This thread can't change the | |
| 1087 // state of the monitor so it doesn't need to be suspended. | |
| 1088 Handle th(wjava_thread->threadObj()); | |
| 1089 ret.waiters[offset + j] = (jthread)jni_reference(calling_thread, th); | |
| 1090 ret.notify_waiters[j++] = (jthread)jni_reference(calling_thread, th); | |
| 1091 } | |
| 1092 waiter = mon->next_waiter(waiter); | |
| 1093 } | |
| 1094 } | |
| 1095 } | |
| 1096 | |
| 1097 // Adjust count. nWant and nWait count values may be less than original. | |
| 1098 ret.waiter_count = nWant + nWait; | |
| 1099 ret.notify_waiter_count = nWait; | |
| 1100 } else { | |
| 1101 // this object has a lightweight monitor and we have nothing more | |
| 1102 // to do here because the defaults are just fine. | |
| 1103 } | |
| 1104 | |
| 1105 // we don't update return parameter unless everything worked | |
| 1106 *info_ptr = ret; | |
| 1107 | |
| 1108 return JVMTI_ERROR_NONE; | |
| 1109 } | |
| 1110 | |
| 1111 ResourceTracker::ResourceTracker(JvmtiEnv* env) { | |
| 1112 _env = env; | |
| 1113 _allocations = new (ResourceObj::C_HEAP) GrowableArray<unsigned char*>(20, true); | |
| 1114 _failed = false; | |
| 1115 } | |
| 1116 ResourceTracker::~ResourceTracker() { | |
| 1117 if (_failed) { | |
| 1118 for (int i=0; i<_allocations->length(); i++) { | |
| 1119 _env->deallocate(_allocations->at(i)); | |
| 1120 } | |
| 1121 } | |
| 1122 delete _allocations; | |
| 1123 } | |
| 1124 | |
| 1125 jvmtiError ResourceTracker::allocate(jlong size, unsigned char** mem_ptr) { | |
| 1126 unsigned char *ptr; | |
| 1127 jvmtiError err = _env->allocate(size, &ptr); | |
| 1128 if (err == JVMTI_ERROR_NONE) { | |
| 1129 _allocations->append(ptr); | |
| 1130 *mem_ptr = ptr; | |
| 1131 } else { | |
| 1132 *mem_ptr = NULL; | |
| 1133 _failed = true; | |
| 1134 } | |
| 1135 return err; | |
| 1136 } | |
| 1137 | |
| 1138 unsigned char* ResourceTracker::allocate(jlong size) { | |
| 1139 unsigned char* ptr; | |
| 1140 allocate(size, &ptr); | |
| 1141 return ptr; | |
| 1142 } | |
| 1143 | |
| 1144 char* ResourceTracker::strdup(const char* str) { | |
| 1145 char *dup_str = (char*)allocate(strlen(str)+1); | |
| 1146 if (dup_str != NULL) { | |
| 1147 strcpy(dup_str, str); | |
| 1148 } | |
| 1149 return dup_str; | |
| 1150 } | |
| 1151 | |
| 1152 struct StackInfoNode { | |
| 1153 struct StackInfoNode *next; | |
| 1154 jvmtiStackInfo info; | |
| 1155 }; | |
| 1156 | |
| 1157 // Create a jvmtiStackInfo inside a linked list node and create a | |
| 1158 // buffer for the frame information, both allocated as resource objects. | |
| 1159 // Fill in both the jvmtiStackInfo and the jvmtiFrameInfo. | |
| 1160 // Note that either or both of thr and thread_oop | |
| 1161 // may be null if the thread is new or has exited. | |
| 1162 void | |
| 1163 VM_GetMultipleStackTraces::fill_frames(jthread jt, JavaThread *thr, oop thread_oop) { | |
| 1164 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 1165 | |
| 1166 jint state = 0; | |
| 1167 struct StackInfoNode *node = NEW_RESOURCE_OBJ(struct StackInfoNode); | |
| 1168 jvmtiStackInfo *infop = &(node->info); | |
| 1169 node->next = head(); | |
| 1170 set_head(node); | |
| 1171 infop->frame_count = 0; | |
| 1172 infop->thread = jt; | |
| 1173 | |
| 1174 if (thread_oop != NULL) { | |
| 1175 // get most state bits | |
| 1176 state = (jint)java_lang_Thread::get_thread_status(thread_oop); | |
| 1177 } | |
| 1178 | |
| 1179 if (thr != NULL) { // add more state bits if there is a JavaThead to query | |
| 1180 // same as is_being_ext_suspended() but without locking | |
| 1181 if (thr->is_ext_suspended() || thr->is_external_suspend()) { | |
| 1182 state |= JVMTI_THREAD_STATE_SUSPENDED; | |
| 1183 } | |
| 1184 JavaThreadState jts = thr->thread_state(); | |
| 1185 if (jts == _thread_in_native) { | |
| 1186 state |= JVMTI_THREAD_STATE_IN_NATIVE; | |
| 1187 } | |
| 1188 OSThread* osThread = thr->osthread(); | |
| 1189 if (osThread != NULL && osThread->interrupted()) { | |
| 1190 state |= JVMTI_THREAD_STATE_INTERRUPTED; | |
| 1191 } | |
| 1192 } | |
| 1193 infop->state = state; | |
| 1194 | |
| 1195 if (thr != NULL || (state & JVMTI_THREAD_STATE_ALIVE) != 0) { | |
| 1196 infop->frame_buffer = NEW_RESOURCE_ARRAY(jvmtiFrameInfo, max_frame_count()); | |
| 1197 env()->get_stack_trace(thr, 0, max_frame_count(), | |
| 1198 infop->frame_buffer, &(infop->frame_count)); | |
| 1199 } else { | |
| 1200 infop->frame_buffer = NULL; | |
| 1201 infop->frame_count = 0; | |
| 1202 } | |
| 1203 _frame_count_total += infop->frame_count; | |
| 1204 } | |
| 1205 | |
| 1206 // Based on the stack information in the linked list, allocate memory | |
| 1207 // block to return and fill it from the info in the linked list. | |
| 1208 void | |
| 1209 VM_GetMultipleStackTraces::allocate_and_fill_stacks(jint thread_count) { | |
| 1210 // do I need to worry about alignment issues? | |
| 1211 jlong alloc_size = thread_count * sizeof(jvmtiStackInfo) | |
| 1212 + _frame_count_total * sizeof(jvmtiFrameInfo); | |
| 1213 env()->allocate(alloc_size, (unsigned char **)&_stack_info); | |
| 1214 | |
| 1215 // pointers to move through the newly allocated space as it is filled in | |
| 1216 jvmtiStackInfo *si = _stack_info + thread_count; // bottom of stack info | |
| 1217 jvmtiFrameInfo *fi = (jvmtiFrameInfo *)si; // is the top of frame info | |
| 1218 | |
| 1219 // copy information in resource area into allocated buffer | |
| 1220 // insert stack info backwards since linked list is backwards | |
| 1221 // insert frame info forwards | |
| 1222 // walk the StackInfoNodes | |
| 1223 for (struct StackInfoNode *sin = head(); sin != NULL; sin = sin->next) { | |
| 1224 jint frame_count = sin->info.frame_count; | |
| 1225 size_t frames_size = frame_count * sizeof(jvmtiFrameInfo); | |
| 1226 --si; | |
| 1227 memcpy(si, &(sin->info), sizeof(jvmtiStackInfo)); | |
| 1228 if (frames_size == 0) { | |
| 1229 si->frame_buffer = NULL; | |
| 1230 } else { | |
| 1231 memcpy(fi, sin->info.frame_buffer, frames_size); | |
| 1232 si->frame_buffer = fi; // point to the new allocated copy of the frames | |
| 1233 fi += frame_count; | |
| 1234 } | |
| 1235 } | |
| 1236 assert(si == _stack_info, "the last copied stack info must be the first record"); | |
| 1237 assert((unsigned char *)fi == ((unsigned char *)_stack_info) + alloc_size, | |
| 1238 "the last copied frame info must be the last record"); | |
| 1239 } | |
| 1240 | |
| 1241 | |
| 1242 void | |
| 1243 VM_GetThreadListStackTraces::doit() { | |
| 1244 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 1245 | |
| 1246 ResourceMark rm; | |
| 1247 for (int i = 0; i < _thread_count; ++i) { | |
| 1248 jthread jt = _thread_list[i]; | |
| 1249 oop thread_oop = JNIHandles::resolve_external_guard(jt); | |
| 1250 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::thread_klass())) { | |
| 1251 set_result(JVMTI_ERROR_INVALID_THREAD); | |
| 1252 return; | |
| 1253 } | |
| 1254 fill_frames(jt, java_lang_Thread::thread(thread_oop), thread_oop); | |
| 1255 } | |
| 1256 allocate_and_fill_stacks(_thread_count); | |
| 1257 } | |
| 1258 | |
| 1259 void | |
| 1260 VM_GetAllStackTraces::doit() { | |
| 1261 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 1262 | |
| 1263 ResourceMark rm; | |
| 1264 _final_thread_count = 0; | |
| 1265 for (JavaThread *jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
| 1266 oop thread_oop = jt->threadObj(); | |
| 1267 if (thread_oop != NULL && | |
| 1268 !jt->is_exiting() && | |
| 1269 java_lang_Thread::is_alive(thread_oop) && | |
| 1270 !jt->is_hidden_from_external_view()) { | |
| 1271 ++_final_thread_count; | |
| 1272 // Handle block of the calling thread is used to create local refs. | |
| 1273 fill_frames((jthread)JNIHandles::make_local(_calling_thread, thread_oop), | |
| 1274 jt, thread_oop); | |
| 1275 } | |
| 1276 } | |
| 1277 allocate_and_fill_stacks(_final_thread_count); | |
| 1278 } | |
| 1279 | |
| 1280 // Verifies that the top frame is a java frame in an expected state. | |
| 1281 // Deoptimizes frame if needed. | |
| 1282 // Checks that the frame method signature matches the return type (tos). | |
| 1283 // HandleMark must be defined in the caller only. | |
| 1284 // It is to keep a ret_ob_h handle alive after return to the caller. | |
| 1285 jvmtiError | |
| 1286 JvmtiEnvBase::check_top_frame(JavaThread* current_thread, JavaThread* java_thread, | |
| 1287 jvalue value, TosState tos, Handle* ret_ob_h) { | |
| 1288 ResourceMark rm(current_thread); | |
| 1289 | |
| 1290 vframe *vf = vframeFor(java_thread, 0); | |
| 1291 NULL_CHECK(vf, JVMTI_ERROR_NO_MORE_FRAMES); | |
| 1292 | |
| 1293 javaVFrame *jvf = (javaVFrame*) vf; | |
| 1294 if (!vf->is_java_frame() || jvf->method()->is_native()) { | |
| 1295 return JVMTI_ERROR_OPAQUE_FRAME; | |
| 1296 } | |
| 1297 | |
| 1298 // If the frame is a compiled one, need to deoptimize it. | |
| 1299 if (vf->is_compiled_frame()) { | |
| 1300 if (!vf->fr().can_be_deoptimized()) { | |
| 1301 return JVMTI_ERROR_OPAQUE_FRAME; | |
| 1302 } | |
| 1303 VM_DeoptimizeFrame deopt(java_thread, jvf->fr().id()); | |
| 1304 VMThread::execute(&deopt); | |
| 1305 } | |
| 1306 | |
| 1307 // Get information about method return type | |
| 1308 symbolHandle signature(current_thread, jvf->method()->signature()); | |
| 1309 | |
| 1310 ResultTypeFinder rtf(signature); | |
| 1311 TosState fr_tos = as_TosState(rtf.type()); | |
| 1312 if (fr_tos != tos) { | |
| 1313 if (tos != itos || (fr_tos != btos && fr_tos != ctos && fr_tos != stos)) { | |
| 1314 return JVMTI_ERROR_TYPE_MISMATCH; | |
| 1315 } | |
| 1316 } | |
| 1317 | |
| 1318 // Check that the jobject class matches the return type signature. | |
| 1319 jobject jobj = value.l; | |
| 1320 if (tos == atos && jobj != NULL) { // NULL reference is allowed | |
| 1321 Handle ob_h = Handle(current_thread, JNIHandles::resolve_external_guard(jobj)); | |
| 1322 NULL_CHECK(ob_h, JVMTI_ERROR_INVALID_OBJECT); | |
| 1323 KlassHandle ob_kh = KlassHandle(current_thread, ob_h()->klass()); | |
| 1324 NULL_CHECK(ob_kh, JVMTI_ERROR_INVALID_OBJECT); | |
| 1325 | |
| 1326 // Method return type signature. | |
| 1327 char* ty_sign = 1 + strchr(signature->as_C_string(), ')'); | |
| 1328 | |
| 1329 if (!VM_GetOrSetLocal::is_assignable(ty_sign, Klass::cast(ob_kh()), current_thread)) { | |
| 1330 return JVMTI_ERROR_TYPE_MISMATCH; | |
| 1331 } | |
| 1332 *ret_ob_h = ob_h; | |
| 1333 } | |
| 1334 return JVMTI_ERROR_NONE; | |
| 1335 } /* end check_top_frame */ | |
| 1336 | |
| 1337 | |
| 1338 // ForceEarlyReturn<type> follows the PopFrame approach in many aspects. | |
| 1339 // Main difference is on the last stage in the interpreter. | |
| 1340 // The PopFrame stops method execution to continue execution | |
| 1341 // from the same method call instruction. | |
| 1342 // The ForceEarlyReturn forces return from method so the execution | |
| 1343 // continues at the bytecode following the method call. | |
| 1344 | |
| 1345 // Threads_lock NOT held, java_thread not protected by lock | |
| 1346 // java_thread - pre-checked | |
| 1347 | |
| 1348 jvmtiError | |
| 1349 JvmtiEnvBase::force_early_return(JavaThread* java_thread, jvalue value, TosState tos) { | |
| 1350 JavaThread* current_thread = JavaThread::current(); | |
| 1351 HandleMark hm(current_thread); | |
| 1352 uint32_t debug_bits = 0; | |
| 1353 | |
|
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1354 // retrieve or create the state |
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1355 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); |
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1356 if (state == NULL) { |
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1357 return JVMTI_ERROR_THREAD_NOT_ALIVE; |
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1358 } |
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1359 |
| 0 | 1360 // Check if java_thread is fully suspended |
| 1361 if (!is_thread_fully_suspended(java_thread, | |
| 1362 true /* wait for suspend completion */, | |
| 1363 &debug_bits)) { | |
| 1364 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
| 1365 } | |
| 1366 | |
| 1367 // Check to see if a ForceEarlyReturn was already in progress | |
| 1368 if (state->is_earlyret_pending()) { | |
| 1369 // Probably possible for JVMTI clients to trigger this, but the | |
| 1370 // JPDA backend shouldn't allow this to happen | |
| 1371 return JVMTI_ERROR_INTERNAL; | |
| 1372 } | |
| 1373 { | |
| 1374 // The same as for PopFrame. Workaround bug: | |
| 1375 // 4812902: popFrame hangs if the method is waiting at a synchronize | |
| 1376 // Catch this condition and return an error to avoid hanging. | |
| 1377 // Now JVMTI spec allows an implementation to bail out with an opaque | |
| 1378 // frame error. | |
| 1379 OSThread* osThread = java_thread->osthread(); | |
| 1380 if (osThread->get_state() == MONITOR_WAIT) { | |
| 1381 return JVMTI_ERROR_OPAQUE_FRAME; | |
| 1382 } | |
| 1383 } | |
| 1384 Handle ret_ob_h = Handle(); | |
| 1385 jvmtiError err = check_top_frame(current_thread, java_thread, value, tos, &ret_ob_h); | |
| 1386 if (err != JVMTI_ERROR_NONE) { | |
| 1387 return err; | |
| 1388 } | |
| 1389 assert(tos != atos || value.l == NULL || ret_ob_h() != NULL, | |
| 1390 "return object oop must not be NULL if jobject is not NULL"); | |
| 1391 | |
| 1392 // Update the thread state to reflect that the top frame must be | |
| 1393 // forced to return. | |
| 1394 // The current frame will be returned later when the suspended | |
| 1395 // thread is resumed and right before returning from VM to Java. | |
| 1396 // (see call_VM_base() in assembler_<cpu>.cpp). | |
| 1397 | |
| 1398 state->set_earlyret_pending(); | |
| 1399 state->set_earlyret_oop(ret_ob_h()); | |
| 1400 state->set_earlyret_value(value, tos); | |
| 1401 | |
| 1402 // Set pending step flag for this early return. | |
| 1403 // It is cleared when next step event is posted. | |
| 1404 state->set_pending_step_for_earlyret(); | |
| 1405 | |
| 1406 return JVMTI_ERROR_NONE; | |
| 1407 } /* end force_early_return */ | |
| 1408 | |
| 1409 void | |
| 1410 JvmtiMonitorClosure::do_monitor(ObjectMonitor* mon) { | |
| 1411 if ( _error != JVMTI_ERROR_NONE) { | |
| 1412 // Error occurred in previous iteration so no need to add | |
| 1413 // to the list. | |
| 1414 return; | |
| 1415 } | |
| 1416 if (mon->owner() == _java_thread ) { | |
| 1417 // Filter out on stack monitors collected during stack walk. | |
| 1418 oop obj = (oop)mon->object(); | |
| 1419 bool found = false; | |
| 1420 for (int j = 0; j < _owned_monitors_list->length(); j++) { | |
| 1421 jobject jobj = ((jvmtiMonitorStackDepthInfo*)_owned_monitors_list->at(j))->monitor; | |
| 1422 oop check = JNIHandles::resolve(jobj); | |
| 1423 if (check == obj) { | |
| 1424 // On stack monitor already collected during the stack walk. | |
| 1425 found = true; | |
| 1426 break; | |
| 1427 } | |
| 1428 } | |
| 1429 if (found == false) { | |
| 1430 // This is off stack monitor (e.g. acquired via jni MonitorEnter). | |
| 1431 jvmtiError err; | |
| 1432 jvmtiMonitorStackDepthInfo *jmsdi; | |
| 1433 err = _env->allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); | |
| 1434 if (err != JVMTI_ERROR_NONE) { | |
| 1435 _error = err; | |
| 1436 return; | |
| 1437 } | |
| 1438 Handle hobj(obj); | |
| 1439 jmsdi->monitor = _env->jni_reference(_calling_thread, hobj); | |
| 1440 // stack depth is unknown for this monitor. | |
| 1441 jmsdi->stack_depth = -1; | |
| 1442 _owned_monitors_list->append(jmsdi); | |
| 1443 } | |
| 1444 } | |
| 1445 } | |
| 1446 | |
| 1447 #endif // !JVMTI_KERNEL |