Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiEnvBase.cpp @ 1905:ce6848d0666d
6968367: can_post_on_exceptions is still using VM_DeoptimizeFrame in some places
Reviewed-by: kvn, twisti
| author | never |
|---|---|
| date | Tue, 19 Oct 2010 16:14:34 -0700 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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2 * Copyright (c) 2003, 2009, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 # 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 |
| 1122 | 126 bool |
| 1121 | 127 JvmtiEnvBase::use_version_1_0_semantics() { |
| 128 int major, minor, micro; | |
| 129 | |
| 130 JvmtiExport::decode_version_values(_version, &major, &minor, µ); | |
| 131 return major == 1 && minor == 0; // micro version doesn't matter here | |
| 132 } | |
| 133 | |
| 134 | |
| 135 bool | |
| 136 JvmtiEnvBase::use_version_1_1_semantics() { | |
| 137 int major, minor, micro; | |
| 138 | |
| 139 JvmtiExport::decode_version_values(_version, &major, &minor, µ); | |
| 140 return major == 1 && minor == 1; // micro version doesn't matter here | |
| 141 } | |
| 142 | |
| 143 | |
| 144 JvmtiEnvBase::JvmtiEnvBase(jint version) : _env_event_enable() { | |
| 145 _version = version; | |
| 0 | 146 _env_local_storage = NULL; |
| 147 _tag_map = NULL; | |
| 148 _native_method_prefix_count = 0; | |
| 149 _native_method_prefixes = NULL; | |
| 150 _next = NULL; | |
| 151 _class_file_load_hook_ever_enabled = false; | |
| 152 | |
| 153 // Moot since ClassFileLoadHook not yet enabled. | |
| 154 // But "true" will give a more predictable ClassFileLoadHook behavior | |
| 155 // for environment creation during ClassFileLoadHook. | |
| 156 _is_retransformable = true; | |
| 157 | |
| 158 // all callbacks initially NULL | |
| 159 memset(&_event_callbacks,0,sizeof(jvmtiEventCallbacks)); | |
| 160 | |
| 161 // all capabilities initially off | |
| 162 memset(&_current_capabilities, 0, sizeof(_current_capabilities)); | |
| 163 | |
| 164 // all prohibited capabilities initially off | |
| 165 memset(&_prohibited_capabilities, 0, sizeof(_prohibited_capabilities)); | |
| 166 | |
| 167 _magic = JVMTI_MAGIC; | |
| 168 | |
| 169 JvmtiEventController::env_initialize((JvmtiEnv*)this); | |
| 170 | |
| 171 #ifdef JVMTI_TRACE | |
| 371 | 172 _jvmti_external.functions = TraceJVMTI != NULL ? &jvmtiTrace_Interface : &jvmti_Interface; |
| 0 | 173 #else |
| 174 _jvmti_external.functions = &jvmti_Interface; | |
| 175 #endif | |
| 176 } | |
| 177 | |
| 178 | |
| 179 void | |
| 180 JvmtiEnvBase::dispose() { | |
| 181 | |
| 182 #ifdef JVMTI_TRACE | |
| 183 JvmtiTrace::shutdown(); | |
| 184 #endif | |
| 185 | |
| 186 // Dispose of event info and let the event controller call us back | |
| 187 // in a locked state (env_dispose, below) | |
| 188 JvmtiEventController::env_dispose(this); | |
| 189 } | |
| 190 | |
| 191 void | |
| 192 JvmtiEnvBase::env_dispose() { | |
| 193 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
| 194 | |
| 195 // We have been entered with all events disabled on this environment. | |
| 196 // A race to re-enable events (by setting callbacks) is prevented by | |
| 197 // checking for a valid environment when setting callbacks (while | |
| 198 // holding the JvmtiThreadState_lock). | |
| 199 | |
| 200 // Mark as invalid. | |
| 201 _magic = DISPOSED_MAGIC; | |
| 202 | |
| 203 // Relinquish all capabilities. | |
| 204 jvmtiCapabilities *caps = get_capabilities(); | |
| 205 JvmtiManageCapabilities::relinquish_capabilities(caps, caps, caps); | |
| 206 | |
| 207 // Same situation as with events (see above) | |
| 208 set_native_method_prefixes(0, NULL); | |
| 209 | |
| 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 _needs_clean_up = true; | |
| 220 } | |
| 221 | |
| 222 | |
| 223 JvmtiEnvBase::~JvmtiEnvBase() { | |
| 224 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
| 225 | |
| 226 // There is a small window of time during which the tag map of a | |
| 227 // disposed environment could have been reallocated. | |
| 228 // Make sure it is gone. | |
| 229 #ifndef JVMTI_KERNEL | |
| 230 JvmtiTagMap* tag_map_to_deallocate = _tag_map; | |
| 231 set_tag_map(NULL); | |
| 232 // A tag map can be big, deallocate it now | |
| 233 if (tag_map_to_deallocate != NULL) { | |
| 234 delete tag_map_to_deallocate; | |
| 235 } | |
| 236 #endif // !JVMTI_KERNEL | |
| 237 | |
| 238 _magic = BAD_MAGIC; | |
| 239 } | |
| 240 | |
| 241 | |
| 242 void | |
| 243 JvmtiEnvBase::periodic_clean_up() { | |
| 244 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
| 245 | |
| 246 // JvmtiEnvBase reference is saved in JvmtiEnvThreadState. So | |
| 247 // clean up JvmtiThreadState before deleting JvmtiEnv pointer. | |
| 248 JvmtiThreadState::periodic_clean_up(); | |
| 249 | |
| 250 // Unlink all invalid environments from the list of environments | |
| 251 // and deallocate them | |
| 252 JvmtiEnvIterator it; | |
| 253 JvmtiEnvBase* previous_env = NULL; | |
| 254 JvmtiEnvBase* env = it.first(); | |
| 255 while (env != NULL) { | |
| 256 if (env->is_valid()) { | |
| 257 previous_env = env; | |
| 258 env = it.next(env); | |
| 259 } else { | |
| 260 // This one isn't valid, remove it from the list and deallocate it | |
| 261 JvmtiEnvBase* defunct_env = env; | |
| 262 env = it.next(env); | |
| 263 if (previous_env == NULL) { | |
| 264 _head_environment = env; | |
| 265 } else { | |
| 266 previous_env->set_next_environment(env); | |
| 267 } | |
| 268 delete defunct_env; | |
| 269 } | |
| 270 } | |
| 271 | |
| 272 } | |
| 273 | |
| 274 | |
| 275 void | |
| 276 JvmtiEnvBase::check_for_periodic_clean_up() { | |
| 277 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
| 278 | |
| 279 class ThreadInsideIterationClosure: public ThreadClosure { | |
| 280 private: | |
| 281 bool _inside; | |
| 282 public: | |
| 283 ThreadInsideIterationClosure() : _inside(false) {}; | |
| 284 | |
| 285 void do_thread(Thread* thread) { | |
| 286 _inside |= thread->is_inside_jvmti_env_iteration(); | |
| 287 } | |
| 288 | |
| 289 bool is_inside_jvmti_env_iteration() { | |
| 290 return _inside; | |
| 291 } | |
| 292 }; | |
| 293 | |
| 294 if (_needs_clean_up) { | |
| 295 // Check if we are currently iterating environment, | |
| 296 // deallocation should not occur if we are | |
| 297 ThreadInsideIterationClosure tiic; | |
| 298 Threads::threads_do(&tiic); | |
| 299 if (!tiic.is_inside_jvmti_env_iteration() && | |
| 300 !is_inside_dying_thread_env_iteration()) { | |
| 301 _needs_clean_up = false; | |
| 302 JvmtiEnvBase::periodic_clean_up(); | |
| 303 } | |
| 304 } | |
| 305 } | |
| 306 | |
| 307 | |
| 308 void | |
| 309 JvmtiEnvBase::record_first_time_class_file_load_hook_enabled() { | |
| 310 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), | |
| 311 "sanity check"); | |
| 312 | |
| 313 if (!_class_file_load_hook_ever_enabled) { | |
| 314 _class_file_load_hook_ever_enabled = true; | |
| 315 | |
| 316 if (get_capabilities()->can_retransform_classes) { | |
| 317 _is_retransformable = true; | |
| 318 } else { | |
| 319 _is_retransformable = false; | |
| 320 | |
| 321 // cannot add retransform capability after ClassFileLoadHook has been enabled | |
| 322 get_prohibited_capabilities()->can_retransform_classes = 1; | |
| 323 } | |
| 324 } | |
| 325 } | |
| 326 | |
| 327 | |
| 328 void | |
| 329 JvmtiEnvBase::record_class_file_load_hook_enabled() { | |
| 330 if (!_class_file_load_hook_ever_enabled) { | |
| 331 if (Threads::number_of_threads() == 0) { | |
| 332 record_first_time_class_file_load_hook_enabled(); | |
| 333 } else { | |
| 334 MutexLocker mu(JvmtiThreadState_lock); | |
| 335 record_first_time_class_file_load_hook_enabled(); | |
| 336 } | |
| 337 } | |
| 338 } | |
| 339 | |
| 340 | |
| 341 jvmtiError | |
| 342 JvmtiEnvBase::set_native_method_prefixes(jint prefix_count, char** prefixes) { | |
| 343 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), | |
| 344 "sanity check"); | |
| 345 | |
| 346 int old_prefix_count = get_native_method_prefix_count(); | |
| 347 char **old_prefixes = get_native_method_prefixes(); | |
| 348 | |
| 349 // allocate and install the new prefixex | |
| 350 if (prefix_count == 0 || !is_valid()) { | |
| 351 _native_method_prefix_count = 0; | |
| 352 _native_method_prefixes = NULL; | |
| 353 } else { | |
| 354 // there are prefixes, allocate an array to hold them, and fill it | |
| 355 char** new_prefixes = (char**)os::malloc((prefix_count) * sizeof(char*)); | |
| 356 if (new_prefixes == NULL) { | |
| 357 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 358 } | |
| 359 for (int i = 0; i < prefix_count; i++) { | |
| 360 char* prefix = prefixes[i]; | |
| 361 if (prefix == NULL) { | |
| 362 for (int j = 0; j < (i-1); j++) { | |
| 363 os::free(new_prefixes[j]); | |
| 364 } | |
| 365 os::free(new_prefixes); | |
| 366 return JVMTI_ERROR_NULL_POINTER; | |
| 367 } | |
| 368 prefix = os::strdup(prefixes[i]); | |
| 369 if (prefix == NULL) { | |
| 370 for (int j = 0; j < (i-1); j++) { | |
| 371 os::free(new_prefixes[j]); | |
| 372 } | |
| 373 os::free(new_prefixes); | |
| 374 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 375 } | |
| 376 new_prefixes[i] = prefix; | |
| 377 } | |
| 378 _native_method_prefix_count = prefix_count; | |
| 379 _native_method_prefixes = new_prefixes; | |
| 380 } | |
| 381 | |
| 382 // now that we know the new prefixes have been successfully installed we can | |
| 383 // safely remove the old ones | |
| 384 if (old_prefix_count != 0) { | |
| 385 for (int i = 0; i < old_prefix_count; i++) { | |
| 386 os::free(old_prefixes[i]); | |
| 387 } | |
| 388 os::free(old_prefixes); | |
| 389 } | |
| 390 | |
| 391 return JVMTI_ERROR_NONE; | |
| 392 } | |
| 393 | |
| 394 | |
| 395 // Collect all the prefixes which have been set in any JVM TI environments | |
| 396 // by the SetNativeMethodPrefix(es) functions. Be sure to maintain the | |
| 397 // order of environments and the order of prefixes within each environment. | |
| 398 // Return in a resource allocated array. | |
| 399 char** | |
| 400 JvmtiEnvBase::get_all_native_method_prefixes(int* count_ptr) { | |
| 401 assert(Threads::number_of_threads() == 0 || | |
| 402 SafepointSynchronize::is_at_safepoint() || | |
| 403 JvmtiThreadState_lock->is_locked(), | |
| 404 "sanity check"); | |
| 405 | |
| 406 int total_count = 0; | |
| 407 GrowableArray<char*>* prefix_array =new GrowableArray<char*>(5); | |
| 408 | |
| 409 JvmtiEnvIterator it; | |
| 410 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
| 411 int prefix_count = env->get_native_method_prefix_count(); | |
| 412 char** prefixes = env->get_native_method_prefixes(); | |
| 413 for (int j = 0; j < prefix_count; j++) { | |
| 414 // retrieve a prefix and so that it is safe against asynchronous changes | |
| 415 // copy it into the resource area | |
| 416 char* prefix = prefixes[j]; | |
| 417 char* prefix_copy = NEW_RESOURCE_ARRAY(char, strlen(prefix)+1); | |
| 418 strcpy(prefix_copy, prefix); | |
| 419 prefix_array->at_put_grow(total_count++, prefix_copy); | |
| 420 } | |
| 421 } | |
| 422 | |
| 423 char** all_prefixes = NEW_RESOURCE_ARRAY(char*, total_count); | |
| 424 char** p = all_prefixes; | |
| 425 for (int i = 0; i < total_count; ++i) { | |
| 426 *p++ = prefix_array->at(i); | |
| 427 } | |
| 428 *count_ptr = total_count; | |
| 429 return all_prefixes; | |
| 430 } | |
| 431 | |
| 432 void | |
| 433 JvmtiEnvBase::set_event_callbacks(const jvmtiEventCallbacks* callbacks, | |
| 434 jint size_of_callbacks) { | |
| 435 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); | |
| 436 | |
| 437 size_t byte_cnt = sizeof(jvmtiEventCallbacks); | |
| 438 | |
| 439 // clear in either case to be sure we got any gap between sizes | |
| 440 memset(&_event_callbacks, 0, byte_cnt); | |
| 441 | |
| 442 // Now that JvmtiThreadState_lock is held, prevent a possible race condition where events | |
| 443 // are re-enabled by a call to set event callbacks where the DisposeEnvironment | |
| 444 // occurs after the boiler-plate environment check and before the lock is acquired. | |
| 445 if (callbacks != NULL && is_valid()) { | |
| 446 if (size_of_callbacks < (jint)byte_cnt) { | |
| 447 byte_cnt = size_of_callbacks; | |
| 448 } | |
| 449 memcpy(&_event_callbacks, callbacks, byte_cnt); | |
| 450 } | |
| 451 } | |
| 452 | |
| 453 // Called from JVMTI entry points which perform stack walking. If the | |
| 454 // associated JavaThread is the current thread, then wait_for_suspend | |
| 455 // is not used. Otherwise, it determines if we should wait for the | |
| 456 // "other" thread to complete external suspension. (NOTE: in future | |
| 457 // releases the suspension mechanism should be reimplemented so this | |
| 458 // is not necessary.) | |
| 459 // | |
| 460 bool | |
| 461 JvmtiEnvBase::is_thread_fully_suspended(JavaThread* thr, bool wait_for_suspend, uint32_t *bits) { | |
| 462 // "other" threads require special handling | |
| 463 if (thr != JavaThread::current()) { | |
| 464 if (wait_for_suspend) { | |
| 465 // We are allowed to wait for the external suspend to complete | |
| 466 // so give the other thread a chance to get suspended. | |
| 467 if (!thr->wait_for_ext_suspend_completion(SuspendRetryCount, | |
| 468 SuspendRetryDelay, bits)) { | |
| 469 // didn't make it so let the caller know | |
| 470 return false; | |
| 471 } | |
| 472 } | |
| 473 // We aren't allowed to wait for the external suspend to complete | |
| 474 // so if the other thread isn't externally suspended we need to | |
| 475 // let the caller know. | |
| 476 else if (!thr->is_ext_suspend_completed_with_lock(bits)) { | |
| 477 return false; | |
| 478 } | |
| 479 } | |
| 480 | |
| 481 return true; | |
| 482 } | |
| 483 | |
| 484 | |
| 485 // In the fullness of time, all users of the method should instead | |
| 486 // directly use allocate, besides being cleaner and faster, this will | |
| 487 // mean much better out of memory handling | |
| 488 unsigned char * | |
| 489 JvmtiEnvBase::jvmtiMalloc(jlong size) { | |
| 490 unsigned char* mem; | |
| 491 jvmtiError result = allocate(size, &mem); | |
| 492 assert(result == JVMTI_ERROR_NONE, "Allocate failed"); | |
| 493 return mem; | |
| 494 } | |
| 495 | |
| 496 | |
| 497 // | |
| 498 // Threads | |
| 499 // | |
| 500 | |
| 501 jobject * | |
| 502 JvmtiEnvBase::new_jobjectArray(int length, Handle *handles) { | |
| 503 if (length == 0) { | |
| 504 return NULL; | |
| 505 } | |
| 506 | |
| 507 jobject *objArray = (jobject *) jvmtiMalloc(sizeof(jobject) * length); | |
| 508 NULL_CHECK(objArray, NULL); | |
| 509 | |
| 510 for (int i=0; i<length; i++) { | |
| 511 objArray[i] = jni_reference(handles[i]); | |
| 512 } | |
| 513 return objArray; | |
| 514 } | |
| 515 | |
| 516 jthread * | |
| 517 JvmtiEnvBase::new_jthreadArray(int length, Handle *handles) { | |
| 518 return (jthread *) new_jobjectArray(length,handles); | |
| 519 } | |
| 520 | |
| 521 jthreadGroup * | |
| 522 JvmtiEnvBase::new_jthreadGroupArray(int length, Handle *handles) { | |
| 523 return (jthreadGroup *) new_jobjectArray(length,handles); | |
| 524 } | |
| 525 | |
| 526 | |
| 527 JavaThread * | |
| 528 JvmtiEnvBase::get_JavaThread(jthread jni_thread) { | |
| 529 oop t = JNIHandles::resolve_external_guard(jni_thread); | |
| 1142 | 530 if (t == NULL || !t->is_a(SystemDictionary::Thread_klass())) { |
| 0 | 531 return NULL; |
| 532 } | |
| 533 // The following returns NULL if the thread has not yet run or is in | |
| 534 // process of exiting | |
| 535 return java_lang_Thread::thread(t); | |
| 536 } | |
| 537 | |
| 538 | |
| 539 // update the access_flags for the field in the klass | |
| 540 void | |
| 541 JvmtiEnvBase::update_klass_field_access_flag(fieldDescriptor *fd) { | |
| 542 instanceKlass* ik = instanceKlass::cast(fd->field_holder()); | |
| 543 typeArrayOop fields = ik->fields(); | |
| 544 fields->ushort_at_put(fd->index(), (jushort)fd->access_flags().as_short()); | |
| 545 } | |
| 546 | |
| 547 | |
| 548 // return the vframe on the specified thread and depth, NULL if no such frame | |
| 549 vframe* | |
| 550 JvmtiEnvBase::vframeFor(JavaThread* java_thread, jint depth) { | |
| 551 if (!java_thread->has_last_Java_frame()) { | |
| 552 return NULL; | |
| 553 } | |
| 554 RegisterMap reg_map(java_thread); | |
| 555 vframe *vf = java_thread->last_java_vframe(®_map); | |
| 556 int d = 0; | |
| 557 while ((vf != NULL) && (d < depth)) { | |
| 558 vf = vf->java_sender(); | |
| 559 d++; | |
| 560 } | |
| 561 return vf; | |
| 562 } | |
| 563 | |
| 564 | |
| 565 // | |
| 566 // utilities: JNI objects | |
| 567 // | |
| 568 | |
| 569 | |
| 570 jclass | |
| 571 JvmtiEnvBase::get_jni_class_non_null(klassOop k) { | |
| 572 assert(k != NULL, "k != NULL"); | |
| 573 return (jclass)jni_reference(Klass::cast(k)->java_mirror()); | |
| 574 } | |
| 575 | |
| 576 #ifndef JVMTI_KERNEL | |
| 577 | |
| 578 // | |
| 579 // Field Information | |
| 580 // | |
| 581 | |
| 582 bool | |
| 583 JvmtiEnvBase::get_field_descriptor(klassOop k, jfieldID field, fieldDescriptor* fd) { | |
| 584 if (!jfieldIDWorkaround::is_valid_jfieldID(k, field)) { | |
| 585 return false; | |
| 586 } | |
| 587 bool found = false; | |
| 588 if (jfieldIDWorkaround::is_static_jfieldID(field)) { | |
| 589 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(field); | |
| 590 int offset = id->offset(); | |
| 591 klassOop holder = id->holder(); | |
| 592 found = instanceKlass::cast(holder)->find_local_field_from_offset(offset, true, fd); | |
| 593 } else { | |
| 594 // Non-static field. The fieldID is really the offset of the field within the object. | |
| 595 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, field); | |
| 596 found = instanceKlass::cast(k)->find_field_from_offset(offset, false, fd); | |
| 597 } | |
| 598 return found; | |
| 599 } | |
| 600 | |
| 601 // | |
| 602 // Object Monitor Information | |
| 603 // | |
| 604 | |
| 605 // | |
| 606 // Count the number of objects for a lightweight monitor. The hobj | |
| 607 // parameter is object that owns the monitor so this routine will | |
| 608 // count the number of times the same object was locked by frames | |
| 609 // in java_thread. | |
| 610 // | |
| 611 jint | |
| 612 JvmtiEnvBase::count_locked_objects(JavaThread *java_thread, Handle hobj) { | |
| 613 jint ret = 0; | |
| 614 if (!java_thread->has_last_Java_frame()) { | |
| 615 return ret; // no Java frames so no monitors | |
| 616 } | |
| 617 | |
| 618 ResourceMark rm; | |
| 619 HandleMark hm; | |
| 620 RegisterMap reg_map(java_thread); | |
| 621 | |
| 622 for(javaVFrame *jvf=java_thread->last_java_vframe(®_map); jvf != NULL; | |
| 623 jvf = jvf->java_sender()) { | |
| 624 GrowableArray<MonitorInfo*>* mons = jvf->monitors(); | |
| 625 if (!mons->is_empty()) { | |
| 626 for (int i = 0; i < mons->length(); i++) { | |
| 627 MonitorInfo *mi = mons->at(i); | |
|
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628 if (mi->owner_is_scalar_replaced()) continue; |
| 0 | 629 |
| 630 // see if owner of the monitor is our object | |
| 631 if (mi->owner() != NULL && mi->owner() == hobj()) { | |
| 632 ret++; | |
| 633 } | |
| 634 } | |
| 635 } | |
| 636 } | |
| 637 return ret; | |
| 638 } | |
| 639 | |
| 640 | |
| 641 | |
| 642 jvmtiError | |
| 643 JvmtiEnvBase::get_current_contended_monitor(JavaThread *calling_thread, JavaThread *java_thread, jobject *monitor_ptr) { | |
| 644 #ifdef ASSERT | |
| 645 uint32_t debug_bits = 0; | |
| 646 #endif | |
| 647 assert((SafepointSynchronize::is_at_safepoint() || | |
| 648 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
| 649 "at safepoint or target thread is suspended"); | |
| 650 oop obj = NULL; | |
| 651 ObjectMonitor *mon = java_thread->current_waiting_monitor(); | |
| 652 if (mon == NULL) { | |
| 653 // thread is not doing an Object.wait() call | |
| 654 mon = java_thread->current_pending_monitor(); | |
| 655 if (mon != NULL) { | |
| 656 // The thread is trying to enter() or raw_enter() an ObjectMonitor. | |
| 657 obj = (oop)mon->object(); | |
| 658 // If obj == NULL, then ObjectMonitor is raw which doesn't count | |
| 659 // as contended for this API | |
| 660 } | |
| 661 // implied else: no contended ObjectMonitor | |
| 662 } else { | |
| 663 // thread is doing an Object.wait() call | |
| 664 obj = (oop)mon->object(); | |
| 665 assert(obj != NULL, "Object.wait() should have an object"); | |
| 666 } | |
| 667 | |
| 668 if (obj == NULL) { | |
| 669 *monitor_ptr = NULL; | |
| 670 } else { | |
| 671 HandleMark hm; | |
| 672 Handle hobj(obj); | |
| 673 *monitor_ptr = jni_reference(calling_thread, hobj); | |
| 674 } | |
| 675 return JVMTI_ERROR_NONE; | |
| 676 } | |
| 677 | |
| 678 | |
| 679 jvmtiError | |
| 680 JvmtiEnvBase::get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread, | |
| 681 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list) { | |
| 682 jvmtiError err = JVMTI_ERROR_NONE; | |
| 683 #ifdef ASSERT | |
| 684 uint32_t debug_bits = 0; | |
| 685 #endif | |
| 686 assert((SafepointSynchronize::is_at_safepoint() || | |
| 687 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
| 688 "at safepoint or target thread is suspended"); | |
| 689 | |
| 690 if (java_thread->has_last_Java_frame()) { | |
| 691 ResourceMark rm; | |
| 692 HandleMark hm; | |
| 693 RegisterMap reg_map(java_thread); | |
| 694 | |
| 695 int depth = 0; | |
| 696 for (javaVFrame *jvf = java_thread->last_java_vframe(®_map); jvf != NULL; | |
| 697 jvf = jvf->java_sender()) { | |
| 698 if (depth++ < MaxJavaStackTraceDepth) { // check for stack too deep | |
| 699 // add locked objects for this frame into list | |
| 700 err = get_locked_objects_in_frame(calling_thread, java_thread, jvf, owned_monitors_list, depth-1); | |
| 701 if (err != JVMTI_ERROR_NONE) { | |
| 702 return err; | |
| 703 } | |
| 704 } | |
| 705 } | |
| 706 } | |
| 707 | |
| 708 // Get off stack monitors. (e.g. acquired via jni MonitorEnter). | |
| 709 JvmtiMonitorClosure jmc(java_thread, calling_thread, owned_monitors_list, this); | |
| 710 ObjectSynchronizer::monitors_iterate(&jmc); | |
| 711 err = jmc.error(); | |
| 712 | |
| 713 return err; | |
| 714 } | |
| 715 | |
| 716 // Save JNI local handles for any objects that this frame owns. | |
| 717 jvmtiError | |
| 718 JvmtiEnvBase::get_locked_objects_in_frame(JavaThread* calling_thread, JavaThread* java_thread, | |
| 719 javaVFrame *jvf, GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, int stack_depth) { | |
| 720 jvmtiError err = JVMTI_ERROR_NONE; | |
| 721 ResourceMark rm; | |
| 722 | |
| 723 GrowableArray<MonitorInfo*>* mons = jvf->monitors(); | |
| 724 if (mons->is_empty()) { | |
| 725 return err; // this javaVFrame holds no monitors | |
| 726 } | |
| 727 | |
| 728 HandleMark hm; | |
| 729 oop wait_obj = NULL; | |
| 730 { | |
| 731 // save object of current wait() call (if any) for later comparison | |
| 732 ObjectMonitor *mon = java_thread->current_waiting_monitor(); | |
| 733 if (mon != NULL) { | |
| 734 wait_obj = (oop)mon->object(); | |
| 735 } | |
| 736 } | |
| 737 oop pending_obj = NULL; | |
| 738 { | |
| 739 // save object of current enter() call (if any) for later comparison | |
| 740 ObjectMonitor *mon = java_thread->current_pending_monitor(); | |
| 741 if (mon != NULL) { | |
| 742 pending_obj = (oop)mon->object(); | |
| 743 } | |
| 744 } | |
| 745 | |
| 746 for (int i = 0; i < mons->length(); i++) { | |
| 747 MonitorInfo *mi = mons->at(i); | |
| 748 | |
|
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749 if (mi->owner_is_scalar_replaced()) continue; |
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750 |
| 0 | 751 oop obj = mi->owner(); |
| 752 if (obj == NULL) { | |
| 753 // this monitor doesn't have an owning object so skip it | |
| 754 continue; | |
| 755 } | |
| 756 | |
| 757 if (wait_obj == obj) { | |
| 758 // the thread is waiting on this monitor so it isn't really owned | |
| 759 continue; | |
| 760 } | |
| 761 | |
| 762 if (pending_obj == obj) { | |
| 763 // the thread is pending on this monitor so it isn't really owned | |
| 764 continue; | |
| 765 } | |
| 766 | |
| 767 if (owned_monitors_list->length() > 0) { | |
| 768 // Our list has at least one object on it so we have to check | |
| 769 // for recursive object locking | |
| 770 bool found = false; | |
| 771 for (int j = 0; j < owned_monitors_list->length(); j++) { | |
| 772 jobject jobj = ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(j))->monitor; | |
| 773 oop check = JNIHandles::resolve(jobj); | |
| 774 if (check == obj) { | |
| 775 found = true; // we found the object | |
| 776 break; | |
| 777 } | |
| 778 } | |
| 779 | |
| 780 if (found) { | |
| 781 // already have this object so don't include it | |
| 782 continue; | |
| 783 } | |
| 784 } | |
| 785 | |
| 786 // add the owning object to our list | |
| 787 jvmtiMonitorStackDepthInfo *jmsdi; | |
| 788 err = allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); | |
| 789 if (err != JVMTI_ERROR_NONE) { | |
| 790 return err; | |
| 791 } | |
| 792 Handle hobj(obj); | |
| 793 jmsdi->monitor = jni_reference(calling_thread, hobj); | |
| 794 jmsdi->stack_depth = stack_depth; | |
| 795 owned_monitors_list->append(jmsdi); | |
| 796 } | |
| 797 | |
| 798 return err; | |
| 799 } | |
| 800 | |
| 801 jvmtiError | |
| 802 JvmtiEnvBase::get_stack_trace(JavaThread *java_thread, | |
| 803 jint start_depth, jint max_count, | |
| 804 jvmtiFrameInfo* frame_buffer, jint* count_ptr) { | |
| 805 #ifdef ASSERT | |
| 806 uint32_t debug_bits = 0; | |
| 807 #endif | |
| 808 assert((SafepointSynchronize::is_at_safepoint() || | |
| 809 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
| 810 "at safepoint or target thread is suspended"); | |
| 811 int count = 0; | |
| 812 if (java_thread->has_last_Java_frame()) { | |
| 813 RegisterMap reg_map(java_thread); | |
| 814 Thread* current_thread = Thread::current(); | |
| 815 ResourceMark rm(current_thread); | |
| 816 javaVFrame *jvf = java_thread->last_java_vframe(®_map); | |
| 817 HandleMark hm(current_thread); | |
| 818 if (start_depth != 0) { | |
| 819 if (start_depth > 0) { | |
| 820 for (int j = 0; j < start_depth && jvf != NULL; j++) { | |
| 821 jvf = jvf->java_sender(); | |
| 822 } | |
| 823 if (jvf == NULL) { | |
| 824 // start_depth is deeper than the stack depth | |
| 825 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
| 826 } | |
| 827 } else { // start_depth < 0 | |
| 828 // we are referencing the starting depth based on the oldest | |
| 829 // part of the stack. | |
| 830 // optimize to limit the number of times that java_sender() is called | |
| 831 javaVFrame *jvf_cursor = jvf; | |
| 832 javaVFrame *jvf_prev = NULL; | |
| 833 javaVFrame *jvf_prev_prev; | |
| 834 int j = 0; | |
| 835 while (jvf_cursor != NULL) { | |
| 836 jvf_prev_prev = jvf_prev; | |
| 837 jvf_prev = jvf_cursor; | |
| 838 for (j = 0; j > start_depth && jvf_cursor != NULL; j--) { | |
| 839 jvf_cursor = jvf_cursor->java_sender(); | |
| 840 } | |
| 841 } | |
| 842 if (j == start_depth) { | |
| 843 // previous pointer is exactly where we want to start | |
| 844 jvf = jvf_prev; | |
| 845 } else { | |
| 846 // we need to back up further to get to the right place | |
| 847 if (jvf_prev_prev == NULL) { | |
| 848 // the -start_depth is greater than the stack depth | |
| 849 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
| 850 } | |
| 851 // j now is the number of frames on the stack starting with | |
| 852 // jvf_prev, we start from jvf_prev_prev and move older on | |
| 853 // the stack that many, the result is -start_depth frames | |
| 854 // remaining. | |
| 855 jvf = jvf_prev_prev; | |
| 856 for (; j < 0; j++) { | |
| 857 jvf = jvf->java_sender(); | |
| 858 } | |
| 859 } | |
| 860 } | |
| 861 } | |
| 862 for (; count < max_count && jvf != NULL; count++) { | |
| 863 frame_buffer[count].method = jvf->method()->jmethod_id(); | |
| 864 frame_buffer[count].location = (jvf->method()->is_native() ? -1 : jvf->bci()); | |
| 865 jvf = jvf->java_sender(); | |
| 866 } | |
| 867 } else { | |
| 868 if (start_depth != 0) { | |
| 869 // no frames and there is a starting depth | |
| 870 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
| 871 } | |
| 872 } | |
| 873 *count_ptr = count; | |
| 874 return JVMTI_ERROR_NONE; | |
| 875 } | |
| 876 | |
| 877 jvmtiError | |
| 878 JvmtiEnvBase::get_frame_count(JvmtiThreadState *state, jint *count_ptr) { | |
| 879 assert((state != NULL), | |
| 880 "JavaThread should create JvmtiThreadState before calling this method"); | |
| 881 *count_ptr = state->count_frames(); | |
| 882 return JVMTI_ERROR_NONE; | |
| 883 } | |
| 884 | |
| 885 jvmtiError | |
| 886 JvmtiEnvBase::get_frame_location(JavaThread *java_thread, jint depth, | |
| 887 jmethodID* method_ptr, jlocation* location_ptr) { | |
| 888 #ifdef ASSERT | |
| 889 uint32_t debug_bits = 0; | |
| 890 #endif | |
| 891 assert((SafepointSynchronize::is_at_safepoint() || | |
| 892 is_thread_fully_suspended(java_thread, false, &debug_bits)), | |
| 893 "at safepoint or target thread is suspended"); | |
| 894 Thread* current_thread = Thread::current(); | |
| 895 ResourceMark rm(current_thread); | |
| 896 | |
| 897 vframe *vf = vframeFor(java_thread, depth); | |
| 898 if (vf == NULL) { | |
| 899 return JVMTI_ERROR_NO_MORE_FRAMES; | |
| 900 } | |
| 901 | |
| 902 // vframeFor should return a java frame. If it doesn't | |
| 903 // it means we've got an internal error and we return the | |
| 904 // error in product mode. In debug mode we will instead | |
| 905 // attempt to cast the vframe to a javaVFrame and will | |
| 906 // cause an assertion/crash to allow further diagnosis. | |
| 907 #ifdef PRODUCT | |
| 908 if (!vf->is_java_frame()) { | |
| 909 return JVMTI_ERROR_INTERNAL; | |
| 910 } | |
| 911 #endif | |
| 912 | |
| 913 HandleMark hm(current_thread); | |
| 914 javaVFrame *jvf = javaVFrame::cast(vf); | |
| 915 methodOop method = jvf->method(); | |
| 916 if (method->is_native()) { | |
| 917 *location_ptr = -1; | |
| 918 } else { | |
| 919 *location_ptr = jvf->bci(); | |
| 920 } | |
| 921 *method_ptr = method->jmethod_id(); | |
| 922 | |
| 923 return JVMTI_ERROR_NONE; | |
| 924 } | |
| 925 | |
| 926 | |
| 927 jvmtiError | |
| 928 JvmtiEnvBase::get_object_monitor_usage(JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) { | |
| 929 HandleMark hm; | |
| 930 Handle hobj; | |
| 931 | |
| 932 bool at_safepoint = SafepointSynchronize::is_at_safepoint(); | |
| 933 | |
| 934 // Check arguments | |
| 935 { | |
| 936 oop mirror = JNIHandles::resolve_external_guard(object); | |
| 937 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT); | |
| 938 NULL_CHECK(info_ptr, JVMTI_ERROR_NULL_POINTER); | |
| 939 | |
| 940 hobj = Handle(mirror); | |
| 941 } | |
| 942 | |
| 943 JavaThread *owning_thread = NULL; | |
| 944 ObjectMonitor *mon = NULL; | |
| 945 jvmtiMonitorUsage ret = { | |
| 946 NULL, 0, 0, NULL, 0, NULL | |
| 947 }; | |
| 948 | |
| 949 uint32_t debug_bits = 0; | |
| 950 // first derive the object's owner and entry_count (if any) | |
| 951 { | |
| 952 // Revoke any biases before querying the mark word | |
| 953 if (SafepointSynchronize::is_at_safepoint()) { | |
| 954 BiasedLocking::revoke_at_safepoint(hobj); | |
| 955 } else { | |
| 956 BiasedLocking::revoke_and_rebias(hobj, false, calling_thread); | |
| 957 } | |
| 958 | |
| 959 address owner = NULL; | |
| 960 { | |
| 961 markOop mark = hobj()->mark(); | |
| 962 | |
| 963 if (!mark->has_monitor()) { | |
| 964 // this object has a lightweight monitor | |
| 965 | |
| 966 if (mark->has_locker()) { | |
| 967 owner = (address)mark->locker(); // save the address of the Lock word | |
| 968 } | |
| 969 // implied else: no owner | |
| 970 } else { | |
| 971 // this object has a heavyweight monitor | |
| 972 mon = mark->monitor(); | |
| 973 | |
| 974 // The owner field of a heavyweight monitor may be NULL for no | |
| 975 // owner, a JavaThread * or it may still be the address of the | |
| 976 // Lock word in a JavaThread's stack. A monitor can be inflated | |
| 977 // by a non-owning JavaThread, but only the owning JavaThread | |
| 978 // can change the owner field from the Lock word to the | |
| 979 // JavaThread * and it may not have done that yet. | |
| 980 owner = (address)mon->owner(); | |
| 981 } | |
| 982 } | |
| 983 | |
| 984 if (owner != NULL) { | |
| 985 // This monitor is owned so we have to find the owning JavaThread. | |
| 986 // Since owning_thread_from_monitor_owner() grabs a lock, GC can | |
| 987 // move our object at this point. However, our owner value is safe | |
| 988 // since it is either the Lock word on a stack or a JavaThread *. | |
| 989 owning_thread = Threads::owning_thread_from_monitor_owner(owner, !at_safepoint); | |
| 990 assert(owning_thread != NULL, "sanity check"); | |
| 991 if (owning_thread != NULL) { // robustness | |
| 992 // The monitor's owner either has to be the current thread, at safepoint | |
| 993 // or it has to be suspended. Any of these conditions will prevent both | |
| 994 // contending and waiting threads from modifying the state of | |
| 995 // the monitor. | |
| 996 if (!at_safepoint && !JvmtiEnv::is_thread_fully_suspended(owning_thread, true, &debug_bits)) { | |
| 997 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
| 998 } | |
| 999 HandleMark hm; | |
| 1000 Handle th(owning_thread->threadObj()); | |
| 1001 ret.owner = (jthread)jni_reference(calling_thread, th); | |
| 1002 } | |
| 1003 // implied else: no owner | |
| 1004 } | |
| 1005 | |
| 1006 if (owning_thread != NULL) { // monitor is owned | |
| 1007 if ((address)owning_thread == owner) { | |
| 1008 // the owner field is the JavaThread * | |
| 1009 assert(mon != NULL, | |
| 1010 "must have heavyweight monitor with JavaThread * owner"); | |
| 1011 ret.entry_count = mon->recursions() + 1; | |
| 1012 } else { | |
| 1013 // The owner field is the Lock word on the JavaThread's stack | |
| 1014 // so the recursions field is not valid. We have to count the | |
| 1015 // number of recursive monitor entries the hard way. We pass | |
| 1016 // a handle to survive any GCs along the way. | |
| 1017 ResourceMark rm; | |
| 1018 ret.entry_count = count_locked_objects(owning_thread, hobj); | |
| 1019 } | |
| 1020 } | |
| 1021 // implied else: entry_count == 0 | |
| 1022 } | |
| 1023 | |
| 1024 int nWant,nWait; | |
| 1025 if (mon != NULL) { | |
| 1026 // this object has a heavyweight monitor | |
| 1027 nWant = mon->contentions(); // # of threads contending for monitor | |
| 1028 nWait = mon->waiters(); // # of threads in Object.wait() | |
| 1029 ret.waiter_count = nWant + nWait; | |
| 1030 ret.notify_waiter_count = nWait; | |
| 1031 } else { | |
| 1032 // this object has a lightweight monitor | |
| 1033 ret.waiter_count = 0; | |
| 1034 ret.notify_waiter_count = 0; | |
| 1035 } | |
| 1036 | |
| 1037 // Allocate memory for heavyweight and lightweight monitor. | |
| 1038 jvmtiError err; | |
| 1039 err = allocate(ret.waiter_count * sizeof(jthread *), (unsigned char**)&ret.waiters); | |
| 1040 if (err != JVMTI_ERROR_NONE) { | |
| 1041 return err; | |
| 1042 } | |
| 1043 err = allocate(ret.notify_waiter_count * sizeof(jthread *), | |
| 1044 (unsigned char**)&ret.notify_waiters); | |
| 1045 if (err != JVMTI_ERROR_NONE) { | |
| 1046 deallocate((unsigned char*)ret.waiters); | |
| 1047 return err; | |
| 1048 } | |
| 1049 | |
| 1050 // now derive the rest of the fields | |
| 1051 if (mon != NULL) { | |
| 1052 // this object has a heavyweight monitor | |
| 1053 | |
| 1054 // Number of waiters may actually be less than the waiter count. | |
| 1055 // So NULL out memory so that unused memory will be NULL. | |
| 1056 memset(ret.waiters, 0, ret.waiter_count * sizeof(jthread *)); | |
| 1057 memset(ret.notify_waiters, 0, ret.notify_waiter_count * sizeof(jthread *)); | |
| 1058 | |
| 1059 if (ret.waiter_count > 0) { | |
| 1060 // we have contending and/or waiting threads | |
| 1061 HandleMark hm; | |
| 1062 if (nWant > 0) { | |
| 1063 // we have contending threads | |
| 1064 ResourceMark rm; | |
| 1065 // get_pending_threads returns only java thread so we do not need to | |
| 1066 // check for non java threads. | |
| 1067 GrowableArray<JavaThread*>* wantList = Threads::get_pending_threads( | |
| 1068 nWant, (address)mon, !at_safepoint); | |
| 1069 if (wantList->length() < nWant) { | |
| 1070 // robustness: the pending list has gotten smaller | |
| 1071 nWant = wantList->length(); | |
| 1072 } | |
| 1073 for (int i = 0; i < nWant; i++) { | |
| 1074 JavaThread *pending_thread = wantList->at(i); | |
| 1075 // If the monitor has no owner, then a non-suspended contending | |
| 1076 // thread could potentially change the state of the monitor by | |
| 1077 // entering it. The JVM/TI spec doesn't allow this. | |
| 1078 if (owning_thread == NULL && !at_safepoint & | |
| 1079 !JvmtiEnv::is_thread_fully_suspended(pending_thread, true, &debug_bits)) { | |
| 1080 if (ret.owner != NULL) { | |
| 1081 destroy_jni_reference(calling_thread, ret.owner); | |
| 1082 } | |
| 1083 for (int j = 0; j < i; j++) { | |
| 1084 destroy_jni_reference(calling_thread, ret.waiters[j]); | |
| 1085 } | |
| 1086 deallocate((unsigned char*)ret.waiters); | |
| 1087 deallocate((unsigned char*)ret.notify_waiters); | |
| 1088 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
| 1089 } | |
| 1090 Handle th(pending_thread->threadObj()); | |
| 1091 ret.waiters[i] = (jthread)jni_reference(calling_thread, th); | |
| 1092 } | |
| 1093 } | |
| 1094 if (nWait > 0) { | |
| 1095 // we have threads in Object.wait() | |
| 1096 int offset = nWant; // add after any contending threads | |
| 1097 ObjectWaiter *waiter = mon->first_waiter(); | |
| 1098 for (int i = 0, j = 0; i < nWait; i++) { | |
| 1099 if (waiter == NULL) { | |
| 1100 // robustness: the waiting list has gotten smaller | |
| 1101 nWait = j; | |
| 1102 break; | |
| 1103 } | |
| 1104 Thread *t = mon->thread_of_waiter(waiter); | |
| 1105 if (t != NULL && t->is_Java_thread()) { | |
| 1106 JavaThread *wjava_thread = (JavaThread *)t; | |
| 1107 // If the thread was found on the ObjectWaiter list, then | |
| 1108 // it has not been notified. This thread can't change the | |
| 1109 // state of the monitor so it doesn't need to be suspended. | |
| 1110 Handle th(wjava_thread->threadObj()); | |
| 1111 ret.waiters[offset + j] = (jthread)jni_reference(calling_thread, th); | |
| 1112 ret.notify_waiters[j++] = (jthread)jni_reference(calling_thread, th); | |
| 1113 } | |
| 1114 waiter = mon->next_waiter(waiter); | |
| 1115 } | |
| 1116 } | |
| 1117 } | |
| 1118 | |
| 1119 // Adjust count. nWant and nWait count values may be less than original. | |
| 1120 ret.waiter_count = nWant + nWait; | |
| 1121 ret.notify_waiter_count = nWait; | |
| 1122 } else { | |
| 1123 // this object has a lightweight monitor and we have nothing more | |
| 1124 // to do here because the defaults are just fine. | |
| 1125 } | |
| 1126 | |
| 1127 // we don't update return parameter unless everything worked | |
| 1128 *info_ptr = ret; | |
| 1129 | |
| 1130 return JVMTI_ERROR_NONE; | |
| 1131 } | |
| 1132 | |
| 1133 ResourceTracker::ResourceTracker(JvmtiEnv* env) { | |
| 1134 _env = env; | |
| 1135 _allocations = new (ResourceObj::C_HEAP) GrowableArray<unsigned char*>(20, true); | |
| 1136 _failed = false; | |
| 1137 } | |
| 1138 ResourceTracker::~ResourceTracker() { | |
| 1139 if (_failed) { | |
| 1140 for (int i=0; i<_allocations->length(); i++) { | |
| 1141 _env->deallocate(_allocations->at(i)); | |
| 1142 } | |
| 1143 } | |
| 1144 delete _allocations; | |
| 1145 } | |
| 1146 | |
| 1147 jvmtiError ResourceTracker::allocate(jlong size, unsigned char** mem_ptr) { | |
| 1148 unsigned char *ptr; | |
| 1149 jvmtiError err = _env->allocate(size, &ptr); | |
| 1150 if (err == JVMTI_ERROR_NONE) { | |
| 1151 _allocations->append(ptr); | |
| 1152 *mem_ptr = ptr; | |
| 1153 } else { | |
| 1154 *mem_ptr = NULL; | |
| 1155 _failed = true; | |
| 1156 } | |
| 1157 return err; | |
| 1158 } | |
| 1159 | |
| 1160 unsigned char* ResourceTracker::allocate(jlong size) { | |
| 1161 unsigned char* ptr; | |
| 1162 allocate(size, &ptr); | |
| 1163 return ptr; | |
| 1164 } | |
| 1165 | |
| 1166 char* ResourceTracker::strdup(const char* str) { | |
| 1167 char *dup_str = (char*)allocate(strlen(str)+1); | |
| 1168 if (dup_str != NULL) { | |
| 1169 strcpy(dup_str, str); | |
| 1170 } | |
| 1171 return dup_str; | |
| 1172 } | |
| 1173 | |
| 1174 struct StackInfoNode { | |
| 1175 struct StackInfoNode *next; | |
| 1176 jvmtiStackInfo info; | |
| 1177 }; | |
| 1178 | |
| 1179 // Create a jvmtiStackInfo inside a linked list node and create a | |
| 1180 // buffer for the frame information, both allocated as resource objects. | |
| 1181 // Fill in both the jvmtiStackInfo and the jvmtiFrameInfo. | |
| 1182 // Note that either or both of thr and thread_oop | |
| 1183 // may be null if the thread is new or has exited. | |
| 1184 void | |
| 1185 VM_GetMultipleStackTraces::fill_frames(jthread jt, JavaThread *thr, oop thread_oop) { | |
| 1186 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 1187 | |
| 1188 jint state = 0; | |
| 1189 struct StackInfoNode *node = NEW_RESOURCE_OBJ(struct StackInfoNode); | |
| 1190 jvmtiStackInfo *infop = &(node->info); | |
| 1191 node->next = head(); | |
| 1192 set_head(node); | |
| 1193 infop->frame_count = 0; | |
| 1194 infop->thread = jt; | |
| 1195 | |
| 1196 if (thread_oop != NULL) { | |
| 1197 // get most state bits | |
| 1198 state = (jint)java_lang_Thread::get_thread_status(thread_oop); | |
| 1199 } | |
| 1200 | |
| 1201 if (thr != NULL) { // add more state bits if there is a JavaThead to query | |
| 1202 // same as is_being_ext_suspended() but without locking | |
| 1203 if (thr->is_ext_suspended() || thr->is_external_suspend()) { | |
| 1204 state |= JVMTI_THREAD_STATE_SUSPENDED; | |
| 1205 } | |
| 1206 JavaThreadState jts = thr->thread_state(); | |
| 1207 if (jts == _thread_in_native) { | |
| 1208 state |= JVMTI_THREAD_STATE_IN_NATIVE; | |
| 1209 } | |
| 1210 OSThread* osThread = thr->osthread(); | |
| 1211 if (osThread != NULL && osThread->interrupted()) { | |
| 1212 state |= JVMTI_THREAD_STATE_INTERRUPTED; | |
| 1213 } | |
| 1214 } | |
| 1215 infop->state = state; | |
| 1216 | |
| 1217 if (thr != NULL || (state & JVMTI_THREAD_STATE_ALIVE) != 0) { | |
| 1218 infop->frame_buffer = NEW_RESOURCE_ARRAY(jvmtiFrameInfo, max_frame_count()); | |
| 1219 env()->get_stack_trace(thr, 0, max_frame_count(), | |
| 1220 infop->frame_buffer, &(infop->frame_count)); | |
| 1221 } else { | |
| 1222 infop->frame_buffer = NULL; | |
| 1223 infop->frame_count = 0; | |
| 1224 } | |
| 1225 _frame_count_total += infop->frame_count; | |
| 1226 } | |
| 1227 | |
| 1228 // Based on the stack information in the linked list, allocate memory | |
| 1229 // block to return and fill it from the info in the linked list. | |
| 1230 void | |
| 1231 VM_GetMultipleStackTraces::allocate_and_fill_stacks(jint thread_count) { | |
| 1232 // do I need to worry about alignment issues? | |
| 1233 jlong alloc_size = thread_count * sizeof(jvmtiStackInfo) | |
| 1234 + _frame_count_total * sizeof(jvmtiFrameInfo); | |
| 1235 env()->allocate(alloc_size, (unsigned char **)&_stack_info); | |
| 1236 | |
| 1237 // pointers to move through the newly allocated space as it is filled in | |
| 1238 jvmtiStackInfo *si = _stack_info + thread_count; // bottom of stack info | |
| 1239 jvmtiFrameInfo *fi = (jvmtiFrameInfo *)si; // is the top of frame info | |
| 1240 | |
| 1241 // copy information in resource area into allocated buffer | |
| 1242 // insert stack info backwards since linked list is backwards | |
| 1243 // insert frame info forwards | |
| 1244 // walk the StackInfoNodes | |
| 1245 for (struct StackInfoNode *sin = head(); sin != NULL; sin = sin->next) { | |
| 1246 jint frame_count = sin->info.frame_count; | |
| 1247 size_t frames_size = frame_count * sizeof(jvmtiFrameInfo); | |
| 1248 --si; | |
| 1249 memcpy(si, &(sin->info), sizeof(jvmtiStackInfo)); | |
| 1250 if (frames_size == 0) { | |
| 1251 si->frame_buffer = NULL; | |
| 1252 } else { | |
| 1253 memcpy(fi, sin->info.frame_buffer, frames_size); | |
| 1254 si->frame_buffer = fi; // point to the new allocated copy of the frames | |
| 1255 fi += frame_count; | |
| 1256 } | |
| 1257 } | |
| 1258 assert(si == _stack_info, "the last copied stack info must be the first record"); | |
| 1259 assert((unsigned char *)fi == ((unsigned char *)_stack_info) + alloc_size, | |
| 1260 "the last copied frame info must be the last record"); | |
| 1261 } | |
| 1262 | |
| 1263 | |
| 1264 void | |
| 1265 VM_GetThreadListStackTraces::doit() { | |
| 1266 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 1267 | |
| 1268 ResourceMark rm; | |
| 1269 for (int i = 0; i < _thread_count; ++i) { | |
| 1270 jthread jt = _thread_list[i]; | |
| 1271 oop thread_oop = JNIHandles::resolve_external_guard(jt); | |
| 1142 | 1272 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) { |
| 0 | 1273 set_result(JVMTI_ERROR_INVALID_THREAD); |
| 1274 return; | |
| 1275 } | |
| 1276 fill_frames(jt, java_lang_Thread::thread(thread_oop), thread_oop); | |
| 1277 } | |
| 1278 allocate_and_fill_stacks(_thread_count); | |
| 1279 } | |
| 1280 | |
| 1281 void | |
| 1282 VM_GetAllStackTraces::doit() { | |
| 1283 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 1284 | |
| 1285 ResourceMark rm; | |
| 1286 _final_thread_count = 0; | |
| 1287 for (JavaThread *jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
| 1288 oop thread_oop = jt->threadObj(); | |
| 1289 if (thread_oop != NULL && | |
| 1290 !jt->is_exiting() && | |
| 1291 java_lang_Thread::is_alive(thread_oop) && | |
| 1292 !jt->is_hidden_from_external_view()) { | |
| 1293 ++_final_thread_count; | |
| 1294 // Handle block of the calling thread is used to create local refs. | |
| 1295 fill_frames((jthread)JNIHandles::make_local(_calling_thread, thread_oop), | |
| 1296 jt, thread_oop); | |
| 1297 } | |
| 1298 } | |
| 1299 allocate_and_fill_stacks(_final_thread_count); | |
| 1300 } | |
| 1301 | |
| 1302 // Verifies that the top frame is a java frame in an expected state. | |
| 1303 // Deoptimizes frame if needed. | |
| 1304 // Checks that the frame method signature matches the return type (tos). | |
| 1305 // HandleMark must be defined in the caller only. | |
| 1306 // It is to keep a ret_ob_h handle alive after return to the caller. | |
| 1307 jvmtiError | |
| 1308 JvmtiEnvBase::check_top_frame(JavaThread* current_thread, JavaThread* java_thread, | |
| 1309 jvalue value, TosState tos, Handle* ret_ob_h) { | |
| 1310 ResourceMark rm(current_thread); | |
| 1311 | |
| 1312 vframe *vf = vframeFor(java_thread, 0); | |
| 1313 NULL_CHECK(vf, JVMTI_ERROR_NO_MORE_FRAMES); | |
| 1314 | |
| 1315 javaVFrame *jvf = (javaVFrame*) vf; | |
| 1316 if (!vf->is_java_frame() || jvf->method()->is_native()) { | |
| 1317 return JVMTI_ERROR_OPAQUE_FRAME; | |
| 1318 } | |
| 1319 | |
| 1320 // If the frame is a compiled one, need to deoptimize it. | |
| 1321 if (vf->is_compiled_frame()) { | |
| 1322 if (!vf->fr().can_be_deoptimized()) { | |
| 1323 return JVMTI_ERROR_OPAQUE_FRAME; | |
| 1324 } | |
|
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1325 Deoptimization::deoptimize_frame(java_thread, jvf->fr().id()); |
| 0 | 1326 } |
| 1327 | |
| 1328 // Get information about method return type | |
| 1329 symbolHandle signature(current_thread, jvf->method()->signature()); | |
| 1330 | |
| 1331 ResultTypeFinder rtf(signature); | |
| 1332 TosState fr_tos = as_TosState(rtf.type()); | |
| 1333 if (fr_tos != tos) { | |
| 1334 if (tos != itos || (fr_tos != btos && fr_tos != ctos && fr_tos != stos)) { | |
| 1335 return JVMTI_ERROR_TYPE_MISMATCH; | |
| 1336 } | |
| 1337 } | |
| 1338 | |
| 1339 // Check that the jobject class matches the return type signature. | |
| 1340 jobject jobj = value.l; | |
| 1341 if (tos == atos && jobj != NULL) { // NULL reference is allowed | |
| 1342 Handle ob_h = Handle(current_thread, JNIHandles::resolve_external_guard(jobj)); | |
| 1343 NULL_CHECK(ob_h, JVMTI_ERROR_INVALID_OBJECT); | |
| 1344 KlassHandle ob_kh = KlassHandle(current_thread, ob_h()->klass()); | |
| 1345 NULL_CHECK(ob_kh, JVMTI_ERROR_INVALID_OBJECT); | |
| 1346 | |
| 1347 // Method return type signature. | |
| 1348 char* ty_sign = 1 + strchr(signature->as_C_string(), ')'); | |
| 1349 | |
| 1350 if (!VM_GetOrSetLocal::is_assignable(ty_sign, Klass::cast(ob_kh()), current_thread)) { | |
| 1351 return JVMTI_ERROR_TYPE_MISMATCH; | |
| 1352 } | |
| 1353 *ret_ob_h = ob_h; | |
| 1354 } | |
| 1355 return JVMTI_ERROR_NONE; | |
| 1356 } /* end check_top_frame */ | |
| 1357 | |
| 1358 | |
| 1359 // ForceEarlyReturn<type> follows the PopFrame approach in many aspects. | |
| 1360 // Main difference is on the last stage in the interpreter. | |
| 1361 // The PopFrame stops method execution to continue execution | |
| 1362 // from the same method call instruction. | |
| 1363 // The ForceEarlyReturn forces return from method so the execution | |
| 1364 // continues at the bytecode following the method call. | |
| 1365 | |
| 1366 // Threads_lock NOT held, java_thread not protected by lock | |
| 1367 // java_thread - pre-checked | |
| 1368 | |
| 1369 jvmtiError | |
| 1370 JvmtiEnvBase::force_early_return(JavaThread* java_thread, jvalue value, TosState tos) { | |
| 1371 JavaThread* current_thread = JavaThread::current(); | |
| 1372 HandleMark hm(current_thread); | |
| 1373 uint32_t debug_bits = 0; | |
| 1374 | |
|
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1375 // retrieve or create the state |
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1376 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); |
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1377 if (state == NULL) { |
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1378 return JVMTI_ERROR_THREAD_NOT_ALIVE; |
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1379 } |
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1380 |
| 0 | 1381 // Check if java_thread is fully suspended |
| 1382 if (!is_thread_fully_suspended(java_thread, | |
| 1383 true /* wait for suspend completion */, | |
| 1384 &debug_bits)) { | |
| 1385 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; | |
| 1386 } | |
| 1387 | |
| 1388 // Check to see if a ForceEarlyReturn was already in progress | |
| 1389 if (state->is_earlyret_pending()) { | |
| 1390 // Probably possible for JVMTI clients to trigger this, but the | |
| 1391 // JPDA backend shouldn't allow this to happen | |
| 1392 return JVMTI_ERROR_INTERNAL; | |
| 1393 } | |
| 1394 { | |
| 1395 // The same as for PopFrame. Workaround bug: | |
| 1396 // 4812902: popFrame hangs if the method is waiting at a synchronize | |
| 1397 // Catch this condition and return an error to avoid hanging. | |
| 1398 // Now JVMTI spec allows an implementation to bail out with an opaque | |
| 1399 // frame error. | |
| 1400 OSThread* osThread = java_thread->osthread(); | |
| 1401 if (osThread->get_state() == MONITOR_WAIT) { | |
| 1402 return JVMTI_ERROR_OPAQUE_FRAME; | |
| 1403 } | |
| 1404 } | |
| 1405 Handle ret_ob_h = Handle(); | |
| 1406 jvmtiError err = check_top_frame(current_thread, java_thread, value, tos, &ret_ob_h); | |
| 1407 if (err != JVMTI_ERROR_NONE) { | |
| 1408 return err; | |
| 1409 } | |
| 1410 assert(tos != atos || value.l == NULL || ret_ob_h() != NULL, | |
| 1411 "return object oop must not be NULL if jobject is not NULL"); | |
| 1412 | |
| 1413 // Update the thread state to reflect that the top frame must be | |
| 1414 // forced to return. | |
| 1415 // The current frame will be returned later when the suspended | |
| 1416 // thread is resumed and right before returning from VM to Java. | |
| 1417 // (see call_VM_base() in assembler_<cpu>.cpp). | |
| 1418 | |
| 1419 state->set_earlyret_pending(); | |
| 1420 state->set_earlyret_oop(ret_ob_h()); | |
| 1421 state->set_earlyret_value(value, tos); | |
| 1422 | |
| 1423 // Set pending step flag for this early return. | |
| 1424 // It is cleared when next step event is posted. | |
| 1425 state->set_pending_step_for_earlyret(); | |
| 1426 | |
| 1427 return JVMTI_ERROR_NONE; | |
| 1428 } /* end force_early_return */ | |
| 1429 | |
| 1430 void | |
| 1431 JvmtiMonitorClosure::do_monitor(ObjectMonitor* mon) { | |
| 1432 if ( _error != JVMTI_ERROR_NONE) { | |
| 1433 // Error occurred in previous iteration so no need to add | |
| 1434 // to the list. | |
| 1435 return; | |
| 1436 } | |
| 1437 if (mon->owner() == _java_thread ) { | |
| 1438 // Filter out on stack monitors collected during stack walk. | |
| 1439 oop obj = (oop)mon->object(); | |
| 1440 bool found = false; | |
| 1441 for (int j = 0; j < _owned_monitors_list->length(); j++) { | |
| 1442 jobject jobj = ((jvmtiMonitorStackDepthInfo*)_owned_monitors_list->at(j))->monitor; | |
| 1443 oop check = JNIHandles::resolve(jobj); | |
| 1444 if (check == obj) { | |
| 1445 // On stack monitor already collected during the stack walk. | |
| 1446 found = true; | |
| 1447 break; | |
| 1448 } | |
| 1449 } | |
| 1450 if (found == false) { | |
| 1451 // This is off stack monitor (e.g. acquired via jni MonitorEnter). | |
| 1452 jvmtiError err; | |
| 1453 jvmtiMonitorStackDepthInfo *jmsdi; | |
| 1454 err = _env->allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); | |
| 1455 if (err != JVMTI_ERROR_NONE) { | |
| 1456 _error = err; | |
| 1457 return; | |
| 1458 } | |
| 1459 Handle hobj(obj); | |
| 1460 jmsdi->monitor = _env->jni_reference(_calling_thread, hobj); | |
| 1461 // stack depth is unknown for this monitor. | |
| 1462 jmsdi->stack_depth = -1; | |
| 1463 _owned_monitors_list->append(jmsdi); | |
| 1464 } | |
| 1465 } | |
| 1466 } | |
| 1467 | |
| 1468 #endif // !JVMTI_KERNEL |