Thu, 24 May 2018 17:06:56 +0800
Merge
aoqi@0 | 1 | /* |
kevinw@8368 | 2 | * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. |
aoqi@0 | 8 | * |
aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 13 | * accompanied this code). |
aoqi@0 | 14 | * |
aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 18 | * |
aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 21 | * questions. |
aoqi@0 | 22 | * |
aoqi@0 | 23 | */ |
aoqi@0 | 24 | |
aoqi@0 | 25 | #include "precompiled.hpp" |
aoqi@0 | 26 | #include "classfile/systemDictionary.hpp" |
aoqi@0 | 27 | #include "jvmtifiles/jvmtiEnv.hpp" |
aoqi@0 | 28 | #include "oops/objArrayKlass.hpp" |
aoqi@0 | 29 | #include "oops/objArrayOop.hpp" |
aoqi@0 | 30 | #include "prims/jvmtiEnvBase.hpp" |
aoqi@0 | 31 | #include "prims/jvmtiEventController.inline.hpp" |
aoqi@0 | 32 | #include "prims/jvmtiExtensions.hpp" |
aoqi@0 | 33 | #include "prims/jvmtiImpl.hpp" |
aoqi@0 | 34 | #include "prims/jvmtiManageCapabilities.hpp" |
aoqi@0 | 35 | #include "prims/jvmtiTagMap.hpp" |
aoqi@0 | 36 | #include "prims/jvmtiThreadState.inline.hpp" |
aoqi@0 | 37 | #include "runtime/biasedLocking.hpp" |
aoqi@0 | 38 | #include "runtime/deoptimization.hpp" |
aoqi@0 | 39 | #include "runtime/interfaceSupport.hpp" |
aoqi@0 | 40 | #include "runtime/jfieldIDWorkaround.hpp" |
aoqi@0 | 41 | #include "runtime/objectMonitor.hpp" |
aoqi@0 | 42 | #include "runtime/objectMonitor.inline.hpp" |
aoqi@0 | 43 | #include "runtime/signature.hpp" |
goetz@6911 | 44 | #include "runtime/thread.inline.hpp" |
aoqi@0 | 45 | #include "runtime/vframe.hpp" |
aoqi@0 | 46 | #include "runtime/vframe_hp.hpp" |
aoqi@0 | 47 | #include "runtime/vmThread.hpp" |
aoqi@0 | 48 | #include "runtime/vm_operations.hpp" |
aoqi@0 | 49 | |
aoqi@0 | 50 | /////////////////////////////////////////////////////////////// |
aoqi@0 | 51 | // |
aoqi@0 | 52 | // JvmtiEnvBase |
aoqi@0 | 53 | // |
aoqi@0 | 54 | |
aoqi@0 | 55 | JvmtiEnvBase* JvmtiEnvBase::_head_environment = NULL; |
aoqi@0 | 56 | |
aoqi@0 | 57 | bool JvmtiEnvBase::_globally_initialized = false; |
aoqi@0 | 58 | volatile bool JvmtiEnvBase::_needs_clean_up = false; |
aoqi@0 | 59 | |
aoqi@0 | 60 | jvmtiPhase JvmtiEnvBase::_phase = JVMTI_PHASE_PRIMORDIAL; |
aoqi@0 | 61 | |
aoqi@0 | 62 | volatile int JvmtiEnvBase::_dying_thread_env_iteration_count = 0; |
aoqi@0 | 63 | |
aoqi@0 | 64 | extern jvmtiInterface_1_ jvmti_Interface; |
aoqi@0 | 65 | extern jvmtiInterface_1_ jvmtiTrace_Interface; |
aoqi@0 | 66 | |
aoqi@0 | 67 | |
aoqi@0 | 68 | // perform initializations that must occur before any JVMTI environments |
aoqi@0 | 69 | // are released but which should only be initialized once (no matter |
aoqi@0 | 70 | // how many environments are created). |
aoqi@0 | 71 | void |
aoqi@0 | 72 | JvmtiEnvBase::globally_initialize() { |
aoqi@0 | 73 | assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); |
aoqi@0 | 74 | assert(_globally_initialized == false, "bad call"); |
aoqi@0 | 75 | |
aoqi@0 | 76 | JvmtiManageCapabilities::initialize(); |
aoqi@0 | 77 | |
aoqi@0 | 78 | // register extension functions and events |
aoqi@0 | 79 | JvmtiExtensions::register_extensions(); |
aoqi@0 | 80 | |
aoqi@0 | 81 | #ifdef JVMTI_TRACE |
aoqi@0 | 82 | JvmtiTrace::initialize(); |
aoqi@0 | 83 | #endif |
aoqi@0 | 84 | |
aoqi@0 | 85 | _globally_initialized = true; |
aoqi@0 | 86 | } |
aoqi@0 | 87 | |
aoqi@0 | 88 | |
aoqi@0 | 89 | void |
aoqi@0 | 90 | JvmtiEnvBase::initialize() { |
aoqi@0 | 91 | assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); |
aoqi@0 | 92 | |
aoqi@0 | 93 | // Add this environment to the end of the environment list (order is important) |
aoqi@0 | 94 | { |
aoqi@0 | 95 | // This block of code must not contain any safepoints, as list deallocation |
aoqi@0 | 96 | // (which occurs at a safepoint) cannot occur simultaneously with this list |
aoqi@0 | 97 | // addition. Note: No_Safepoint_Verifier cannot, currently, be used before |
aoqi@0 | 98 | // threads exist. |
aoqi@0 | 99 | JvmtiEnvIterator it; |
aoqi@0 | 100 | JvmtiEnvBase *previous_env = NULL; |
aoqi@0 | 101 | for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { |
aoqi@0 | 102 | previous_env = env; |
aoqi@0 | 103 | } |
aoqi@0 | 104 | if (previous_env == NULL) { |
aoqi@0 | 105 | _head_environment = this; |
aoqi@0 | 106 | } else { |
aoqi@0 | 107 | previous_env->set_next_environment(this); |
aoqi@0 | 108 | } |
aoqi@0 | 109 | } |
aoqi@0 | 110 | |
aoqi@0 | 111 | if (_globally_initialized == false) { |
aoqi@0 | 112 | globally_initialize(); |
aoqi@0 | 113 | } |
aoqi@0 | 114 | } |
aoqi@0 | 115 | |
aoqi@0 | 116 | |
aoqi@0 | 117 | bool |
aoqi@0 | 118 | JvmtiEnvBase::is_valid() { |
aoqi@0 | 119 | jint value = 0; |
aoqi@0 | 120 | |
aoqi@0 | 121 | // This object might not be a JvmtiEnvBase so we can't assume |
aoqi@0 | 122 | // the _magic field is properly aligned. Get the value in a safe |
aoqi@0 | 123 | // way and then check against JVMTI_MAGIC. |
aoqi@0 | 124 | |
aoqi@0 | 125 | switch (sizeof(_magic)) { |
aoqi@0 | 126 | case 2: |
aoqi@0 | 127 | value = Bytes::get_native_u2((address)&_magic); |
aoqi@0 | 128 | break; |
aoqi@0 | 129 | |
aoqi@0 | 130 | case 4: |
aoqi@0 | 131 | value = Bytes::get_native_u4((address)&_magic); |
aoqi@0 | 132 | break; |
aoqi@0 | 133 | |
aoqi@0 | 134 | case 8: |
aoqi@0 | 135 | value = Bytes::get_native_u8((address)&_magic); |
aoqi@0 | 136 | break; |
aoqi@0 | 137 | |
aoqi@0 | 138 | default: |
aoqi@0 | 139 | guarantee(false, "_magic field is an unexpected size"); |
aoqi@0 | 140 | } |
aoqi@0 | 141 | |
aoqi@0 | 142 | return value == JVMTI_MAGIC; |
aoqi@0 | 143 | } |
aoqi@0 | 144 | |
aoqi@0 | 145 | |
aoqi@0 | 146 | bool |
aoqi@0 | 147 | JvmtiEnvBase::use_version_1_0_semantics() { |
aoqi@0 | 148 | int major, minor, micro; |
aoqi@0 | 149 | |
aoqi@0 | 150 | JvmtiExport::decode_version_values(_version, &major, &minor, µ); |
aoqi@0 | 151 | return major == 1 && minor == 0; // micro version doesn't matter here |
aoqi@0 | 152 | } |
aoqi@0 | 153 | |
aoqi@0 | 154 | |
aoqi@0 | 155 | bool |
aoqi@0 | 156 | JvmtiEnvBase::use_version_1_1_semantics() { |
aoqi@0 | 157 | int major, minor, micro; |
aoqi@0 | 158 | |
aoqi@0 | 159 | JvmtiExport::decode_version_values(_version, &major, &minor, µ); |
aoqi@0 | 160 | return major == 1 && minor == 1; // micro version doesn't matter here |
aoqi@0 | 161 | } |
aoqi@0 | 162 | |
aoqi@0 | 163 | bool |
aoqi@0 | 164 | JvmtiEnvBase::use_version_1_2_semantics() { |
aoqi@0 | 165 | int major, minor, micro; |
aoqi@0 | 166 | |
aoqi@0 | 167 | JvmtiExport::decode_version_values(_version, &major, &minor, µ); |
aoqi@0 | 168 | return major == 1 && minor == 2; // micro version doesn't matter here |
aoqi@0 | 169 | } |
aoqi@0 | 170 | |
aoqi@0 | 171 | |
aoqi@0 | 172 | JvmtiEnvBase::JvmtiEnvBase(jint version) : _env_event_enable() { |
aoqi@0 | 173 | _version = version; |
aoqi@0 | 174 | _env_local_storage = NULL; |
aoqi@0 | 175 | _tag_map = NULL; |
aoqi@0 | 176 | _native_method_prefix_count = 0; |
aoqi@0 | 177 | _native_method_prefixes = NULL; |
aoqi@0 | 178 | _next = NULL; |
aoqi@0 | 179 | _class_file_load_hook_ever_enabled = false; |
aoqi@0 | 180 | |
aoqi@0 | 181 | // Moot since ClassFileLoadHook not yet enabled. |
aoqi@0 | 182 | // But "true" will give a more predictable ClassFileLoadHook behavior |
aoqi@0 | 183 | // for environment creation during ClassFileLoadHook. |
aoqi@0 | 184 | _is_retransformable = true; |
aoqi@0 | 185 | |
aoqi@0 | 186 | // all callbacks initially NULL |
aoqi@0 | 187 | memset(&_event_callbacks,0,sizeof(jvmtiEventCallbacks)); |
aoqi@0 | 188 | |
aoqi@0 | 189 | // all capabilities initially off |
aoqi@0 | 190 | memset(&_current_capabilities, 0, sizeof(_current_capabilities)); |
aoqi@0 | 191 | |
aoqi@0 | 192 | // all prohibited capabilities initially off |
aoqi@0 | 193 | memset(&_prohibited_capabilities, 0, sizeof(_prohibited_capabilities)); |
aoqi@0 | 194 | |
aoqi@0 | 195 | _magic = JVMTI_MAGIC; |
aoqi@0 | 196 | |
aoqi@0 | 197 | JvmtiEventController::env_initialize((JvmtiEnv*)this); |
aoqi@0 | 198 | |
aoqi@0 | 199 | #ifdef JVMTI_TRACE |
aoqi@0 | 200 | _jvmti_external.functions = TraceJVMTI != NULL ? &jvmtiTrace_Interface : &jvmti_Interface; |
aoqi@0 | 201 | #else |
aoqi@0 | 202 | _jvmti_external.functions = &jvmti_Interface; |
aoqi@0 | 203 | #endif |
aoqi@0 | 204 | } |
aoqi@0 | 205 | |
aoqi@0 | 206 | |
aoqi@0 | 207 | void |
aoqi@0 | 208 | JvmtiEnvBase::dispose() { |
aoqi@0 | 209 | |
aoqi@0 | 210 | #ifdef JVMTI_TRACE |
aoqi@0 | 211 | JvmtiTrace::shutdown(); |
aoqi@0 | 212 | #endif |
aoqi@0 | 213 | |
aoqi@0 | 214 | // Dispose of event info and let the event controller call us back |
aoqi@0 | 215 | // in a locked state (env_dispose, below) |
aoqi@0 | 216 | JvmtiEventController::env_dispose(this); |
aoqi@0 | 217 | } |
aoqi@0 | 218 | |
aoqi@0 | 219 | void |
aoqi@0 | 220 | JvmtiEnvBase::env_dispose() { |
aoqi@0 | 221 | assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); |
aoqi@0 | 222 | |
aoqi@0 | 223 | // We have been entered with all events disabled on this environment. |
aoqi@0 | 224 | // A race to re-enable events (by setting callbacks) is prevented by |
aoqi@0 | 225 | // checking for a valid environment when setting callbacks (while |
aoqi@0 | 226 | // holding the JvmtiThreadState_lock). |
aoqi@0 | 227 | |
aoqi@0 | 228 | // Mark as invalid. |
aoqi@0 | 229 | _magic = DISPOSED_MAGIC; |
aoqi@0 | 230 | |
aoqi@0 | 231 | // Relinquish all capabilities. |
aoqi@0 | 232 | jvmtiCapabilities *caps = get_capabilities(); |
aoqi@0 | 233 | JvmtiManageCapabilities::relinquish_capabilities(caps, caps, caps); |
aoqi@0 | 234 | |
aoqi@0 | 235 | // Same situation as with events (see above) |
aoqi@0 | 236 | set_native_method_prefixes(0, NULL); |
aoqi@0 | 237 | |
aoqi@0 | 238 | JvmtiTagMap* tag_map_to_deallocate = _tag_map; |
aoqi@0 | 239 | set_tag_map(NULL); |
aoqi@0 | 240 | // A tag map can be big, deallocate it now |
aoqi@0 | 241 | if (tag_map_to_deallocate != NULL) { |
aoqi@0 | 242 | delete tag_map_to_deallocate; |
aoqi@0 | 243 | } |
aoqi@0 | 244 | |
aoqi@0 | 245 | _needs_clean_up = true; |
aoqi@0 | 246 | } |
aoqi@0 | 247 | |
aoqi@0 | 248 | |
aoqi@0 | 249 | JvmtiEnvBase::~JvmtiEnvBase() { |
aoqi@0 | 250 | assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); |
aoqi@0 | 251 | |
aoqi@0 | 252 | // There is a small window of time during which the tag map of a |
aoqi@0 | 253 | // disposed environment could have been reallocated. |
aoqi@0 | 254 | // Make sure it is gone. |
aoqi@0 | 255 | JvmtiTagMap* tag_map_to_deallocate = _tag_map; |
aoqi@0 | 256 | set_tag_map(NULL); |
aoqi@0 | 257 | // A tag map can be big, deallocate it now |
aoqi@0 | 258 | if (tag_map_to_deallocate != NULL) { |
aoqi@0 | 259 | delete tag_map_to_deallocate; |
aoqi@0 | 260 | } |
aoqi@0 | 261 | |
aoqi@0 | 262 | _magic = BAD_MAGIC; |
aoqi@0 | 263 | } |
aoqi@0 | 264 | |
aoqi@0 | 265 | |
aoqi@0 | 266 | void |
aoqi@0 | 267 | JvmtiEnvBase::periodic_clean_up() { |
aoqi@0 | 268 | assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); |
aoqi@0 | 269 | |
aoqi@0 | 270 | // JvmtiEnvBase reference is saved in JvmtiEnvThreadState. So |
aoqi@0 | 271 | // clean up JvmtiThreadState before deleting JvmtiEnv pointer. |
aoqi@0 | 272 | JvmtiThreadState::periodic_clean_up(); |
aoqi@0 | 273 | |
aoqi@0 | 274 | // Unlink all invalid environments from the list of environments |
aoqi@0 | 275 | // and deallocate them |
aoqi@0 | 276 | JvmtiEnvIterator it; |
aoqi@0 | 277 | JvmtiEnvBase* previous_env = NULL; |
aoqi@0 | 278 | JvmtiEnvBase* env = it.first(); |
aoqi@0 | 279 | while (env != NULL) { |
aoqi@0 | 280 | if (env->is_valid()) { |
aoqi@0 | 281 | previous_env = env; |
aoqi@0 | 282 | env = it.next(env); |
aoqi@0 | 283 | } else { |
aoqi@0 | 284 | // This one isn't valid, remove it from the list and deallocate it |
aoqi@0 | 285 | JvmtiEnvBase* defunct_env = env; |
aoqi@0 | 286 | env = it.next(env); |
aoqi@0 | 287 | if (previous_env == NULL) { |
aoqi@0 | 288 | _head_environment = env; |
aoqi@0 | 289 | } else { |
aoqi@0 | 290 | previous_env->set_next_environment(env); |
aoqi@0 | 291 | } |
aoqi@0 | 292 | delete defunct_env; |
aoqi@0 | 293 | } |
aoqi@0 | 294 | } |
aoqi@0 | 295 | |
aoqi@0 | 296 | } |
aoqi@0 | 297 | |
aoqi@0 | 298 | |
aoqi@0 | 299 | void |
aoqi@0 | 300 | JvmtiEnvBase::check_for_periodic_clean_up() { |
aoqi@0 | 301 | assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); |
aoqi@0 | 302 | |
aoqi@0 | 303 | class ThreadInsideIterationClosure: public ThreadClosure { |
aoqi@0 | 304 | private: |
aoqi@0 | 305 | bool _inside; |
aoqi@0 | 306 | public: |
aoqi@0 | 307 | ThreadInsideIterationClosure() : _inside(false) {}; |
aoqi@0 | 308 | |
aoqi@0 | 309 | void do_thread(Thread* thread) { |
aoqi@0 | 310 | _inside |= thread->is_inside_jvmti_env_iteration(); |
aoqi@0 | 311 | } |
aoqi@0 | 312 | |
aoqi@0 | 313 | bool is_inside_jvmti_env_iteration() { |
aoqi@0 | 314 | return _inside; |
aoqi@0 | 315 | } |
aoqi@0 | 316 | }; |
aoqi@0 | 317 | |
aoqi@0 | 318 | if (_needs_clean_up) { |
aoqi@0 | 319 | // Check if we are currently iterating environment, |
aoqi@0 | 320 | // deallocation should not occur if we are |
aoqi@0 | 321 | ThreadInsideIterationClosure tiic; |
aoqi@0 | 322 | Threads::threads_do(&tiic); |
aoqi@0 | 323 | if (!tiic.is_inside_jvmti_env_iteration() && |
aoqi@0 | 324 | !is_inside_dying_thread_env_iteration()) { |
aoqi@0 | 325 | _needs_clean_up = false; |
aoqi@0 | 326 | JvmtiEnvBase::periodic_clean_up(); |
aoqi@0 | 327 | } |
aoqi@0 | 328 | } |
aoqi@0 | 329 | } |
aoqi@0 | 330 | |
aoqi@0 | 331 | |
aoqi@0 | 332 | void |
aoqi@0 | 333 | JvmtiEnvBase::record_first_time_class_file_load_hook_enabled() { |
aoqi@0 | 334 | assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), |
aoqi@0 | 335 | "sanity check"); |
aoqi@0 | 336 | |
aoqi@0 | 337 | if (!_class_file_load_hook_ever_enabled) { |
aoqi@0 | 338 | _class_file_load_hook_ever_enabled = true; |
aoqi@0 | 339 | |
aoqi@0 | 340 | if (get_capabilities()->can_retransform_classes) { |
aoqi@0 | 341 | _is_retransformable = true; |
aoqi@0 | 342 | } else { |
aoqi@0 | 343 | _is_retransformable = false; |
aoqi@0 | 344 | |
aoqi@0 | 345 | // cannot add retransform capability after ClassFileLoadHook has been enabled |
aoqi@0 | 346 | get_prohibited_capabilities()->can_retransform_classes = 1; |
aoqi@0 | 347 | } |
aoqi@0 | 348 | } |
aoqi@0 | 349 | } |
aoqi@0 | 350 | |
aoqi@0 | 351 | |
aoqi@0 | 352 | void |
aoqi@0 | 353 | JvmtiEnvBase::record_class_file_load_hook_enabled() { |
aoqi@0 | 354 | if (!_class_file_load_hook_ever_enabled) { |
aoqi@0 | 355 | if (Threads::number_of_threads() == 0) { |
aoqi@0 | 356 | record_first_time_class_file_load_hook_enabled(); |
aoqi@0 | 357 | } else { |
aoqi@0 | 358 | MutexLocker mu(JvmtiThreadState_lock); |
aoqi@0 | 359 | record_first_time_class_file_load_hook_enabled(); |
aoqi@0 | 360 | } |
aoqi@0 | 361 | } |
aoqi@0 | 362 | } |
aoqi@0 | 363 | |
aoqi@0 | 364 | |
aoqi@0 | 365 | jvmtiError |
aoqi@0 | 366 | JvmtiEnvBase::set_native_method_prefixes(jint prefix_count, char** prefixes) { |
aoqi@0 | 367 | assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), |
aoqi@0 | 368 | "sanity check"); |
aoqi@0 | 369 | |
aoqi@0 | 370 | int old_prefix_count = get_native_method_prefix_count(); |
aoqi@0 | 371 | char **old_prefixes = get_native_method_prefixes(); |
aoqi@0 | 372 | |
aoqi@0 | 373 | // allocate and install the new prefixex |
aoqi@0 | 374 | if (prefix_count == 0 || !is_valid()) { |
aoqi@0 | 375 | _native_method_prefix_count = 0; |
aoqi@0 | 376 | _native_method_prefixes = NULL; |
aoqi@0 | 377 | } else { |
aoqi@0 | 378 | // there are prefixes, allocate an array to hold them, and fill it |
aoqi@0 | 379 | char** new_prefixes = (char**)os::malloc((prefix_count) * sizeof(char*), mtInternal); |
aoqi@0 | 380 | if (new_prefixes == NULL) { |
aoqi@0 | 381 | return JVMTI_ERROR_OUT_OF_MEMORY; |
aoqi@0 | 382 | } |
aoqi@0 | 383 | for (int i = 0; i < prefix_count; i++) { |
aoqi@0 | 384 | char* prefix = prefixes[i]; |
aoqi@0 | 385 | if (prefix == NULL) { |
aoqi@0 | 386 | for (int j = 0; j < (i-1); j++) { |
aoqi@0 | 387 | os::free(new_prefixes[j]); |
aoqi@0 | 388 | } |
aoqi@0 | 389 | os::free(new_prefixes); |
aoqi@0 | 390 | return JVMTI_ERROR_NULL_POINTER; |
aoqi@0 | 391 | } |
aoqi@0 | 392 | prefix = os::strdup(prefixes[i]); |
aoqi@0 | 393 | if (prefix == NULL) { |
aoqi@0 | 394 | for (int j = 0; j < (i-1); j++) { |
aoqi@0 | 395 | os::free(new_prefixes[j]); |
aoqi@0 | 396 | } |
aoqi@0 | 397 | os::free(new_prefixes); |
aoqi@0 | 398 | return JVMTI_ERROR_OUT_OF_MEMORY; |
aoqi@0 | 399 | } |
aoqi@0 | 400 | new_prefixes[i] = prefix; |
aoqi@0 | 401 | } |
aoqi@0 | 402 | _native_method_prefix_count = prefix_count; |
aoqi@0 | 403 | _native_method_prefixes = new_prefixes; |
aoqi@0 | 404 | } |
aoqi@0 | 405 | |
aoqi@0 | 406 | // now that we know the new prefixes have been successfully installed we can |
aoqi@0 | 407 | // safely remove the old ones |
aoqi@0 | 408 | if (old_prefix_count != 0) { |
aoqi@0 | 409 | for (int i = 0; i < old_prefix_count; i++) { |
aoqi@0 | 410 | os::free(old_prefixes[i]); |
aoqi@0 | 411 | } |
aoqi@0 | 412 | os::free(old_prefixes); |
aoqi@0 | 413 | } |
aoqi@0 | 414 | |
aoqi@0 | 415 | return JVMTI_ERROR_NONE; |
aoqi@0 | 416 | } |
aoqi@0 | 417 | |
aoqi@0 | 418 | |
aoqi@0 | 419 | // Collect all the prefixes which have been set in any JVM TI environments |
aoqi@0 | 420 | // by the SetNativeMethodPrefix(es) functions. Be sure to maintain the |
aoqi@0 | 421 | // order of environments and the order of prefixes within each environment. |
aoqi@0 | 422 | // Return in a resource allocated array. |
aoqi@0 | 423 | char** |
aoqi@0 | 424 | JvmtiEnvBase::get_all_native_method_prefixes(int* count_ptr) { |
aoqi@0 | 425 | assert(Threads::number_of_threads() == 0 || |
aoqi@0 | 426 | SafepointSynchronize::is_at_safepoint() || |
aoqi@0 | 427 | JvmtiThreadState_lock->is_locked(), |
aoqi@0 | 428 | "sanity check"); |
aoqi@0 | 429 | |
aoqi@0 | 430 | int total_count = 0; |
aoqi@0 | 431 | GrowableArray<char*>* prefix_array =new GrowableArray<char*>(5); |
aoqi@0 | 432 | |
aoqi@0 | 433 | JvmtiEnvIterator it; |
aoqi@0 | 434 | for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { |
aoqi@0 | 435 | int prefix_count = env->get_native_method_prefix_count(); |
aoqi@0 | 436 | char** prefixes = env->get_native_method_prefixes(); |
aoqi@0 | 437 | for (int j = 0; j < prefix_count; j++) { |
aoqi@0 | 438 | // retrieve a prefix and so that it is safe against asynchronous changes |
aoqi@0 | 439 | // copy it into the resource area |
aoqi@0 | 440 | char* prefix = prefixes[j]; |
aoqi@0 | 441 | char* prefix_copy = NEW_RESOURCE_ARRAY(char, strlen(prefix)+1); |
aoqi@0 | 442 | strcpy(prefix_copy, prefix); |
aoqi@0 | 443 | prefix_array->at_put_grow(total_count++, prefix_copy); |
aoqi@0 | 444 | } |
aoqi@0 | 445 | } |
aoqi@0 | 446 | |
aoqi@0 | 447 | char** all_prefixes = NEW_RESOURCE_ARRAY(char*, total_count); |
aoqi@0 | 448 | char** p = all_prefixes; |
aoqi@0 | 449 | for (int i = 0; i < total_count; ++i) { |
aoqi@0 | 450 | *p++ = prefix_array->at(i); |
aoqi@0 | 451 | } |
aoqi@0 | 452 | *count_ptr = total_count; |
aoqi@0 | 453 | return all_prefixes; |
aoqi@0 | 454 | } |
aoqi@0 | 455 | |
aoqi@0 | 456 | void |
aoqi@0 | 457 | JvmtiEnvBase::set_event_callbacks(const jvmtiEventCallbacks* callbacks, |
aoqi@0 | 458 | jint size_of_callbacks) { |
aoqi@0 | 459 | assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); |
aoqi@0 | 460 | |
aoqi@0 | 461 | size_t byte_cnt = sizeof(jvmtiEventCallbacks); |
aoqi@0 | 462 | |
aoqi@0 | 463 | // clear in either case to be sure we got any gap between sizes |
aoqi@0 | 464 | memset(&_event_callbacks, 0, byte_cnt); |
aoqi@0 | 465 | |
aoqi@0 | 466 | // Now that JvmtiThreadState_lock is held, prevent a possible race condition where events |
aoqi@0 | 467 | // are re-enabled by a call to set event callbacks where the DisposeEnvironment |
aoqi@0 | 468 | // occurs after the boiler-plate environment check and before the lock is acquired. |
aoqi@0 | 469 | if (callbacks != NULL && is_valid()) { |
aoqi@0 | 470 | if (size_of_callbacks < (jint)byte_cnt) { |
aoqi@0 | 471 | byte_cnt = size_of_callbacks; |
aoqi@0 | 472 | } |
aoqi@0 | 473 | memcpy(&_event_callbacks, callbacks, byte_cnt); |
aoqi@0 | 474 | } |
aoqi@0 | 475 | } |
aoqi@0 | 476 | |
aoqi@0 | 477 | // Called from JVMTI entry points which perform stack walking. If the |
aoqi@0 | 478 | // associated JavaThread is the current thread, then wait_for_suspend |
aoqi@0 | 479 | // is not used. Otherwise, it determines if we should wait for the |
aoqi@0 | 480 | // "other" thread to complete external suspension. (NOTE: in future |
aoqi@0 | 481 | // releases the suspension mechanism should be reimplemented so this |
aoqi@0 | 482 | // is not necessary.) |
aoqi@0 | 483 | // |
aoqi@0 | 484 | bool |
aoqi@0 | 485 | JvmtiEnvBase::is_thread_fully_suspended(JavaThread* thr, bool wait_for_suspend, uint32_t *bits) { |
aoqi@0 | 486 | // "other" threads require special handling |
aoqi@0 | 487 | if (thr != JavaThread::current()) { |
aoqi@0 | 488 | if (wait_for_suspend) { |
aoqi@0 | 489 | // We are allowed to wait for the external suspend to complete |
aoqi@0 | 490 | // so give the other thread a chance to get suspended. |
aoqi@0 | 491 | if (!thr->wait_for_ext_suspend_completion(SuspendRetryCount, |
aoqi@0 | 492 | SuspendRetryDelay, bits)) { |
aoqi@0 | 493 | // didn't make it so let the caller know |
aoqi@0 | 494 | return false; |
aoqi@0 | 495 | } |
aoqi@0 | 496 | } |
aoqi@0 | 497 | // We aren't allowed to wait for the external suspend to complete |
aoqi@0 | 498 | // so if the other thread isn't externally suspended we need to |
aoqi@0 | 499 | // let the caller know. |
aoqi@0 | 500 | else if (!thr->is_ext_suspend_completed_with_lock(bits)) { |
aoqi@0 | 501 | return false; |
aoqi@0 | 502 | } |
aoqi@0 | 503 | } |
aoqi@0 | 504 | |
aoqi@0 | 505 | return true; |
aoqi@0 | 506 | } |
aoqi@0 | 507 | |
aoqi@0 | 508 | |
aoqi@0 | 509 | // In the fullness of time, all users of the method should instead |
aoqi@0 | 510 | // directly use allocate, besides being cleaner and faster, this will |
aoqi@0 | 511 | // mean much better out of memory handling |
aoqi@0 | 512 | unsigned char * |
aoqi@0 | 513 | JvmtiEnvBase::jvmtiMalloc(jlong size) { |
csahu@8316 | 514 | unsigned char* mem = NULL; |
aoqi@0 | 515 | jvmtiError result = allocate(size, &mem); |
aoqi@0 | 516 | assert(result == JVMTI_ERROR_NONE, "Allocate failed"); |
aoqi@0 | 517 | return mem; |
aoqi@0 | 518 | } |
aoqi@0 | 519 | |
aoqi@0 | 520 | |
aoqi@0 | 521 | // |
aoqi@0 | 522 | // Threads |
aoqi@0 | 523 | // |
aoqi@0 | 524 | |
aoqi@0 | 525 | jobject * |
aoqi@0 | 526 | JvmtiEnvBase::new_jobjectArray(int length, Handle *handles) { |
aoqi@0 | 527 | if (length == 0) { |
aoqi@0 | 528 | return NULL; |
aoqi@0 | 529 | } |
aoqi@0 | 530 | |
aoqi@0 | 531 | jobject *objArray = (jobject *) jvmtiMalloc(sizeof(jobject) * length); |
aoqi@0 | 532 | NULL_CHECK(objArray, NULL); |
aoqi@0 | 533 | |
aoqi@0 | 534 | for (int i=0; i<length; i++) { |
aoqi@0 | 535 | objArray[i] = jni_reference(handles[i]); |
aoqi@0 | 536 | } |
aoqi@0 | 537 | return objArray; |
aoqi@0 | 538 | } |
aoqi@0 | 539 | |
aoqi@0 | 540 | jthread * |
aoqi@0 | 541 | JvmtiEnvBase::new_jthreadArray(int length, Handle *handles) { |
aoqi@0 | 542 | return (jthread *) new_jobjectArray(length,handles); |
aoqi@0 | 543 | } |
aoqi@0 | 544 | |
aoqi@0 | 545 | jthreadGroup * |
aoqi@0 | 546 | JvmtiEnvBase::new_jthreadGroupArray(int length, Handle *handles) { |
aoqi@0 | 547 | return (jthreadGroup *) new_jobjectArray(length,handles); |
aoqi@0 | 548 | } |
aoqi@0 | 549 | |
aoqi@0 | 550 | |
aoqi@0 | 551 | JavaThread * |
aoqi@0 | 552 | JvmtiEnvBase::get_JavaThread(jthread jni_thread) { |
aoqi@0 | 553 | oop t = JNIHandles::resolve_external_guard(jni_thread); |
aoqi@0 | 554 | if (t == NULL || !t->is_a(SystemDictionary::Thread_klass())) { |
aoqi@0 | 555 | return NULL; |
aoqi@0 | 556 | } |
aoqi@0 | 557 | // The following returns NULL if the thread has not yet run or is in |
aoqi@0 | 558 | // process of exiting |
aoqi@0 | 559 | return java_lang_Thread::thread(t); |
aoqi@0 | 560 | } |
aoqi@0 | 561 | |
aoqi@0 | 562 | |
aoqi@0 | 563 | // return the vframe on the specified thread and depth, NULL if no such frame |
aoqi@0 | 564 | vframe* |
aoqi@0 | 565 | JvmtiEnvBase::vframeFor(JavaThread* java_thread, jint depth) { |
aoqi@0 | 566 | if (!java_thread->has_last_Java_frame()) { |
aoqi@0 | 567 | return NULL; |
aoqi@0 | 568 | } |
aoqi@0 | 569 | RegisterMap reg_map(java_thread); |
aoqi@0 | 570 | vframe *vf = java_thread->last_java_vframe(®_map); |
aoqi@0 | 571 | int d = 0; |
aoqi@0 | 572 | while ((vf != NULL) && (d < depth)) { |
aoqi@0 | 573 | vf = vf->java_sender(); |
aoqi@0 | 574 | d++; |
aoqi@0 | 575 | } |
aoqi@0 | 576 | return vf; |
aoqi@0 | 577 | } |
aoqi@0 | 578 | |
aoqi@0 | 579 | |
aoqi@0 | 580 | // |
aoqi@0 | 581 | // utilities: JNI objects |
aoqi@0 | 582 | // |
aoqi@0 | 583 | |
aoqi@0 | 584 | |
aoqi@0 | 585 | jclass |
aoqi@0 | 586 | JvmtiEnvBase::get_jni_class_non_null(Klass* k) { |
aoqi@0 | 587 | assert(k != NULL, "k != NULL"); |
aoqi@0 | 588 | return (jclass)jni_reference(k->java_mirror()); |
aoqi@0 | 589 | } |
aoqi@0 | 590 | |
aoqi@0 | 591 | // |
aoqi@0 | 592 | // Field Information |
aoqi@0 | 593 | // |
aoqi@0 | 594 | |
aoqi@0 | 595 | bool |
aoqi@0 | 596 | JvmtiEnvBase::get_field_descriptor(Klass* k, jfieldID field, fieldDescriptor* fd) { |
aoqi@0 | 597 | if (!jfieldIDWorkaround::is_valid_jfieldID(k, field)) { |
aoqi@0 | 598 | return false; |
aoqi@0 | 599 | } |
aoqi@0 | 600 | bool found = false; |
aoqi@0 | 601 | if (jfieldIDWorkaround::is_static_jfieldID(field)) { |
aoqi@0 | 602 | JNIid* id = jfieldIDWorkaround::from_static_jfieldID(field); |
aoqi@0 | 603 | found = id->find_local_field(fd); |
aoqi@0 | 604 | } else { |
aoqi@0 | 605 | // Non-static field. The fieldID is really the offset of the field within the object. |
aoqi@0 | 606 | int offset = jfieldIDWorkaround::from_instance_jfieldID(k, field); |
aoqi@0 | 607 | found = InstanceKlass::cast(k)->find_field_from_offset(offset, false, fd); |
aoqi@0 | 608 | } |
aoqi@0 | 609 | return found; |
aoqi@0 | 610 | } |
aoqi@0 | 611 | |
aoqi@0 | 612 | // |
aoqi@0 | 613 | // Object Monitor Information |
aoqi@0 | 614 | // |
aoqi@0 | 615 | |
aoqi@0 | 616 | // |
aoqi@0 | 617 | // Count the number of objects for a lightweight monitor. The hobj |
aoqi@0 | 618 | // parameter is object that owns the monitor so this routine will |
aoqi@0 | 619 | // count the number of times the same object was locked by frames |
aoqi@0 | 620 | // in java_thread. |
aoqi@0 | 621 | // |
aoqi@0 | 622 | jint |
aoqi@0 | 623 | JvmtiEnvBase::count_locked_objects(JavaThread *java_thread, Handle hobj) { |
aoqi@0 | 624 | jint ret = 0; |
aoqi@0 | 625 | if (!java_thread->has_last_Java_frame()) { |
aoqi@0 | 626 | return ret; // no Java frames so no monitors |
aoqi@0 | 627 | } |
aoqi@0 | 628 | |
aoqi@0 | 629 | ResourceMark rm; |
aoqi@0 | 630 | HandleMark hm; |
aoqi@0 | 631 | RegisterMap reg_map(java_thread); |
aoqi@0 | 632 | |
aoqi@0 | 633 | for(javaVFrame *jvf=java_thread->last_java_vframe(®_map); jvf != NULL; |
aoqi@0 | 634 | jvf = jvf->java_sender()) { |
aoqi@0 | 635 | GrowableArray<MonitorInfo*>* mons = jvf->monitors(); |
aoqi@0 | 636 | if (!mons->is_empty()) { |
aoqi@0 | 637 | for (int i = 0; i < mons->length(); i++) { |
aoqi@0 | 638 | MonitorInfo *mi = mons->at(i); |
aoqi@0 | 639 | if (mi->owner_is_scalar_replaced()) continue; |
aoqi@0 | 640 | |
aoqi@0 | 641 | // see if owner of the monitor is our object |
aoqi@0 | 642 | if (mi->owner() != NULL && mi->owner() == hobj()) { |
aoqi@0 | 643 | ret++; |
aoqi@0 | 644 | } |
aoqi@0 | 645 | } |
aoqi@0 | 646 | } |
aoqi@0 | 647 | } |
aoqi@0 | 648 | return ret; |
aoqi@0 | 649 | } |
aoqi@0 | 650 | |
aoqi@0 | 651 | |
aoqi@0 | 652 | |
aoqi@0 | 653 | jvmtiError |
aoqi@0 | 654 | JvmtiEnvBase::get_current_contended_monitor(JavaThread *calling_thread, JavaThread *java_thread, jobject *monitor_ptr) { |
aoqi@0 | 655 | #ifdef ASSERT |
aoqi@0 | 656 | uint32_t debug_bits = 0; |
aoqi@0 | 657 | #endif |
aoqi@0 | 658 | assert((SafepointSynchronize::is_at_safepoint() || |
aoqi@0 | 659 | is_thread_fully_suspended(java_thread, false, &debug_bits)), |
aoqi@0 | 660 | "at safepoint or target thread is suspended"); |
aoqi@0 | 661 | oop obj = NULL; |
aoqi@0 | 662 | ObjectMonitor *mon = java_thread->current_waiting_monitor(); |
aoqi@0 | 663 | if (mon == NULL) { |
aoqi@0 | 664 | // thread is not doing an Object.wait() call |
aoqi@0 | 665 | mon = java_thread->current_pending_monitor(); |
aoqi@0 | 666 | if (mon != NULL) { |
aoqi@0 | 667 | // The thread is trying to enter() or raw_enter() an ObjectMonitor. |
aoqi@0 | 668 | obj = (oop)mon->object(); |
aoqi@0 | 669 | // If obj == NULL, then ObjectMonitor is raw which doesn't count |
aoqi@0 | 670 | // as contended for this API |
aoqi@0 | 671 | } |
aoqi@0 | 672 | // implied else: no contended ObjectMonitor |
aoqi@0 | 673 | } else { |
aoqi@0 | 674 | // thread is doing an Object.wait() call |
aoqi@0 | 675 | obj = (oop)mon->object(); |
aoqi@0 | 676 | assert(obj != NULL, "Object.wait() should have an object"); |
aoqi@0 | 677 | } |
aoqi@0 | 678 | |
aoqi@0 | 679 | if (obj == NULL) { |
aoqi@0 | 680 | *monitor_ptr = NULL; |
aoqi@0 | 681 | } else { |
aoqi@0 | 682 | HandleMark hm; |
aoqi@0 | 683 | Handle hobj(obj); |
aoqi@0 | 684 | *monitor_ptr = jni_reference(calling_thread, hobj); |
aoqi@0 | 685 | } |
aoqi@0 | 686 | return JVMTI_ERROR_NONE; |
aoqi@0 | 687 | } |
aoqi@0 | 688 | |
aoqi@0 | 689 | |
aoqi@0 | 690 | jvmtiError |
aoqi@0 | 691 | JvmtiEnvBase::get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread, |
aoqi@0 | 692 | GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list) { |
aoqi@0 | 693 | jvmtiError err = JVMTI_ERROR_NONE; |
aoqi@0 | 694 | #ifdef ASSERT |
aoqi@0 | 695 | uint32_t debug_bits = 0; |
aoqi@0 | 696 | #endif |
aoqi@0 | 697 | assert((SafepointSynchronize::is_at_safepoint() || |
aoqi@0 | 698 | is_thread_fully_suspended(java_thread, false, &debug_bits)), |
aoqi@0 | 699 | "at safepoint or target thread is suspended"); |
aoqi@0 | 700 | |
aoqi@0 | 701 | if (java_thread->has_last_Java_frame()) { |
aoqi@0 | 702 | ResourceMark rm; |
aoqi@0 | 703 | HandleMark hm; |
aoqi@0 | 704 | RegisterMap reg_map(java_thread); |
aoqi@0 | 705 | |
aoqi@0 | 706 | int depth = 0; |
aoqi@0 | 707 | for (javaVFrame *jvf = java_thread->last_java_vframe(®_map); jvf != NULL; |
aoqi@0 | 708 | jvf = jvf->java_sender()) { |
aoqi@0 | 709 | if (depth++ < MaxJavaStackTraceDepth) { // check for stack too deep |
aoqi@0 | 710 | // add locked objects for this frame into list |
aoqi@0 | 711 | err = get_locked_objects_in_frame(calling_thread, java_thread, jvf, owned_monitors_list, depth-1); |
aoqi@0 | 712 | if (err != JVMTI_ERROR_NONE) { |
aoqi@0 | 713 | return err; |
aoqi@0 | 714 | } |
aoqi@0 | 715 | } |
aoqi@0 | 716 | } |
aoqi@0 | 717 | } |
aoqi@0 | 718 | |
aoqi@0 | 719 | // Get off stack monitors. (e.g. acquired via jni MonitorEnter). |
aoqi@0 | 720 | JvmtiMonitorClosure jmc(java_thread, calling_thread, owned_monitors_list, this); |
aoqi@0 | 721 | ObjectSynchronizer::monitors_iterate(&jmc); |
aoqi@0 | 722 | err = jmc.error(); |
aoqi@0 | 723 | |
aoqi@0 | 724 | return err; |
aoqi@0 | 725 | } |
aoqi@0 | 726 | |
aoqi@0 | 727 | // Save JNI local handles for any objects that this frame owns. |
aoqi@0 | 728 | jvmtiError |
aoqi@0 | 729 | JvmtiEnvBase::get_locked_objects_in_frame(JavaThread* calling_thread, JavaThread* java_thread, |
aoqi@0 | 730 | javaVFrame *jvf, GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, int stack_depth) { |
aoqi@0 | 731 | jvmtiError err = JVMTI_ERROR_NONE; |
aoqi@0 | 732 | ResourceMark rm; |
aoqi@0 | 733 | |
aoqi@0 | 734 | GrowableArray<MonitorInfo*>* mons = jvf->monitors(); |
aoqi@0 | 735 | if (mons->is_empty()) { |
aoqi@0 | 736 | return err; // this javaVFrame holds no monitors |
aoqi@0 | 737 | } |
aoqi@0 | 738 | |
aoqi@0 | 739 | HandleMark hm; |
aoqi@0 | 740 | oop wait_obj = NULL; |
aoqi@0 | 741 | { |
aoqi@0 | 742 | // save object of current wait() call (if any) for later comparison |
aoqi@0 | 743 | ObjectMonitor *mon = java_thread->current_waiting_monitor(); |
aoqi@0 | 744 | if (mon != NULL) { |
aoqi@0 | 745 | wait_obj = (oop)mon->object(); |
aoqi@0 | 746 | } |
aoqi@0 | 747 | } |
aoqi@0 | 748 | oop pending_obj = NULL; |
aoqi@0 | 749 | { |
aoqi@0 | 750 | // save object of current enter() call (if any) for later comparison |
aoqi@0 | 751 | ObjectMonitor *mon = java_thread->current_pending_monitor(); |
aoqi@0 | 752 | if (mon != NULL) { |
aoqi@0 | 753 | pending_obj = (oop)mon->object(); |
aoqi@0 | 754 | } |
aoqi@0 | 755 | } |
aoqi@0 | 756 | |
aoqi@0 | 757 | for (int i = 0; i < mons->length(); i++) { |
aoqi@0 | 758 | MonitorInfo *mi = mons->at(i); |
aoqi@0 | 759 | |
aoqi@0 | 760 | if (mi->owner_is_scalar_replaced()) continue; |
aoqi@0 | 761 | |
aoqi@0 | 762 | oop obj = mi->owner(); |
aoqi@0 | 763 | if (obj == NULL) { |
aoqi@0 | 764 | // this monitor doesn't have an owning object so skip it |
aoqi@0 | 765 | continue; |
aoqi@0 | 766 | } |
aoqi@0 | 767 | |
aoqi@0 | 768 | if (wait_obj == obj) { |
aoqi@0 | 769 | // the thread is waiting on this monitor so it isn't really owned |
aoqi@0 | 770 | continue; |
aoqi@0 | 771 | } |
aoqi@0 | 772 | |
aoqi@0 | 773 | if (pending_obj == obj) { |
aoqi@0 | 774 | // the thread is pending on this monitor so it isn't really owned |
aoqi@0 | 775 | continue; |
aoqi@0 | 776 | } |
aoqi@0 | 777 | |
aoqi@0 | 778 | if (owned_monitors_list->length() > 0) { |
aoqi@0 | 779 | // Our list has at least one object on it so we have to check |
aoqi@0 | 780 | // for recursive object locking |
aoqi@0 | 781 | bool found = false; |
aoqi@0 | 782 | for (int j = 0; j < owned_monitors_list->length(); j++) { |
aoqi@0 | 783 | jobject jobj = ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(j))->monitor; |
aoqi@0 | 784 | oop check = JNIHandles::resolve(jobj); |
aoqi@0 | 785 | if (check == obj) { |
aoqi@0 | 786 | found = true; // we found the object |
aoqi@0 | 787 | break; |
aoqi@0 | 788 | } |
aoqi@0 | 789 | } |
aoqi@0 | 790 | |
aoqi@0 | 791 | if (found) { |
aoqi@0 | 792 | // already have this object so don't include it |
aoqi@0 | 793 | continue; |
aoqi@0 | 794 | } |
aoqi@0 | 795 | } |
aoqi@0 | 796 | |
aoqi@0 | 797 | // add the owning object to our list |
aoqi@0 | 798 | jvmtiMonitorStackDepthInfo *jmsdi; |
aoqi@0 | 799 | err = allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); |
aoqi@0 | 800 | if (err != JVMTI_ERROR_NONE) { |
aoqi@0 | 801 | return err; |
aoqi@0 | 802 | } |
aoqi@0 | 803 | Handle hobj(obj); |
aoqi@0 | 804 | jmsdi->monitor = jni_reference(calling_thread, hobj); |
aoqi@0 | 805 | jmsdi->stack_depth = stack_depth; |
aoqi@0 | 806 | owned_monitors_list->append(jmsdi); |
aoqi@0 | 807 | } |
aoqi@0 | 808 | |
aoqi@0 | 809 | return err; |
aoqi@0 | 810 | } |
aoqi@0 | 811 | |
aoqi@0 | 812 | jvmtiError |
aoqi@0 | 813 | JvmtiEnvBase::get_stack_trace(JavaThread *java_thread, |
aoqi@0 | 814 | jint start_depth, jint max_count, |
aoqi@0 | 815 | jvmtiFrameInfo* frame_buffer, jint* count_ptr) { |
aoqi@0 | 816 | #ifdef ASSERT |
aoqi@0 | 817 | uint32_t debug_bits = 0; |
aoqi@0 | 818 | #endif |
aoqi@0 | 819 | assert((SafepointSynchronize::is_at_safepoint() || |
aoqi@0 | 820 | is_thread_fully_suspended(java_thread, false, &debug_bits)), |
aoqi@0 | 821 | "at safepoint or target thread is suspended"); |
aoqi@0 | 822 | int count = 0; |
aoqi@0 | 823 | if (java_thread->has_last_Java_frame()) { |
aoqi@0 | 824 | RegisterMap reg_map(java_thread); |
aoqi@0 | 825 | Thread* current_thread = Thread::current(); |
aoqi@0 | 826 | ResourceMark rm(current_thread); |
aoqi@0 | 827 | javaVFrame *jvf = java_thread->last_java_vframe(®_map); |
aoqi@0 | 828 | HandleMark hm(current_thread); |
aoqi@0 | 829 | if (start_depth != 0) { |
aoqi@0 | 830 | if (start_depth > 0) { |
aoqi@0 | 831 | for (int j = 0; j < start_depth && jvf != NULL; j++) { |
aoqi@0 | 832 | jvf = jvf->java_sender(); |
aoqi@0 | 833 | } |
aoqi@0 | 834 | if (jvf == NULL) { |
aoqi@0 | 835 | // start_depth is deeper than the stack depth |
aoqi@0 | 836 | return JVMTI_ERROR_ILLEGAL_ARGUMENT; |
aoqi@0 | 837 | } |
aoqi@0 | 838 | } else { // start_depth < 0 |
aoqi@0 | 839 | // we are referencing the starting depth based on the oldest |
aoqi@0 | 840 | // part of the stack. |
aoqi@0 | 841 | // optimize to limit the number of times that java_sender() is called |
aoqi@0 | 842 | javaVFrame *jvf_cursor = jvf; |
aoqi@0 | 843 | javaVFrame *jvf_prev = NULL; |
aoqi@0 | 844 | javaVFrame *jvf_prev_prev; |
aoqi@0 | 845 | int j = 0; |
aoqi@0 | 846 | while (jvf_cursor != NULL) { |
aoqi@0 | 847 | jvf_prev_prev = jvf_prev; |
aoqi@0 | 848 | jvf_prev = jvf_cursor; |
aoqi@0 | 849 | for (j = 0; j > start_depth && jvf_cursor != NULL; j--) { |
aoqi@0 | 850 | jvf_cursor = jvf_cursor->java_sender(); |
aoqi@0 | 851 | } |
aoqi@0 | 852 | } |
aoqi@0 | 853 | if (j == start_depth) { |
aoqi@0 | 854 | // previous pointer is exactly where we want to start |
aoqi@0 | 855 | jvf = jvf_prev; |
aoqi@0 | 856 | } else { |
aoqi@0 | 857 | // we need to back up further to get to the right place |
aoqi@0 | 858 | if (jvf_prev_prev == NULL) { |
aoqi@0 | 859 | // the -start_depth is greater than the stack depth |
aoqi@0 | 860 | return JVMTI_ERROR_ILLEGAL_ARGUMENT; |
aoqi@0 | 861 | } |
aoqi@0 | 862 | // j now is the number of frames on the stack starting with |
aoqi@0 | 863 | // jvf_prev, we start from jvf_prev_prev and move older on |
aoqi@0 | 864 | // the stack that many, the result is -start_depth frames |
aoqi@0 | 865 | // remaining. |
aoqi@0 | 866 | jvf = jvf_prev_prev; |
aoqi@0 | 867 | for (; j < 0; j++) { |
aoqi@0 | 868 | jvf = jvf->java_sender(); |
aoqi@0 | 869 | } |
aoqi@0 | 870 | } |
aoqi@0 | 871 | } |
aoqi@0 | 872 | } |
aoqi@0 | 873 | for (; count < max_count && jvf != NULL; count++) { |
aoqi@0 | 874 | frame_buffer[count].method = jvf->method()->jmethod_id(); |
aoqi@0 | 875 | frame_buffer[count].location = (jvf->method()->is_native() ? -1 : jvf->bci()); |
aoqi@0 | 876 | jvf = jvf->java_sender(); |
aoqi@0 | 877 | } |
aoqi@0 | 878 | } else { |
aoqi@0 | 879 | if (start_depth != 0) { |
aoqi@0 | 880 | // no frames and there is a starting depth |
aoqi@0 | 881 | return JVMTI_ERROR_ILLEGAL_ARGUMENT; |
aoqi@0 | 882 | } |
aoqi@0 | 883 | } |
aoqi@0 | 884 | *count_ptr = count; |
aoqi@0 | 885 | return JVMTI_ERROR_NONE; |
aoqi@0 | 886 | } |
aoqi@0 | 887 | |
aoqi@0 | 888 | jvmtiError |
aoqi@0 | 889 | JvmtiEnvBase::get_frame_count(JvmtiThreadState *state, jint *count_ptr) { |
aoqi@0 | 890 | assert((state != NULL), |
aoqi@0 | 891 | "JavaThread should create JvmtiThreadState before calling this method"); |
aoqi@0 | 892 | *count_ptr = state->count_frames(); |
aoqi@0 | 893 | return JVMTI_ERROR_NONE; |
aoqi@0 | 894 | } |
aoqi@0 | 895 | |
aoqi@0 | 896 | jvmtiError |
aoqi@0 | 897 | JvmtiEnvBase::get_frame_location(JavaThread *java_thread, jint depth, |
aoqi@0 | 898 | jmethodID* method_ptr, jlocation* location_ptr) { |
aoqi@0 | 899 | #ifdef ASSERT |
aoqi@0 | 900 | uint32_t debug_bits = 0; |
aoqi@0 | 901 | #endif |
aoqi@0 | 902 | assert((SafepointSynchronize::is_at_safepoint() || |
aoqi@0 | 903 | is_thread_fully_suspended(java_thread, false, &debug_bits)), |
aoqi@0 | 904 | "at safepoint or target thread is suspended"); |
aoqi@0 | 905 | Thread* current_thread = Thread::current(); |
aoqi@0 | 906 | ResourceMark rm(current_thread); |
aoqi@0 | 907 | |
aoqi@0 | 908 | vframe *vf = vframeFor(java_thread, depth); |
aoqi@0 | 909 | if (vf == NULL) { |
aoqi@0 | 910 | return JVMTI_ERROR_NO_MORE_FRAMES; |
aoqi@0 | 911 | } |
aoqi@0 | 912 | |
aoqi@0 | 913 | // vframeFor should return a java frame. If it doesn't |
aoqi@0 | 914 | // it means we've got an internal error and we return the |
aoqi@0 | 915 | // error in product mode. In debug mode we will instead |
aoqi@0 | 916 | // attempt to cast the vframe to a javaVFrame and will |
aoqi@0 | 917 | // cause an assertion/crash to allow further diagnosis. |
aoqi@0 | 918 | #ifdef PRODUCT |
aoqi@0 | 919 | if (!vf->is_java_frame()) { |
aoqi@0 | 920 | return JVMTI_ERROR_INTERNAL; |
aoqi@0 | 921 | } |
aoqi@0 | 922 | #endif |
aoqi@0 | 923 | |
aoqi@0 | 924 | HandleMark hm(current_thread); |
aoqi@0 | 925 | javaVFrame *jvf = javaVFrame::cast(vf); |
aoqi@0 | 926 | Method* method = jvf->method(); |
aoqi@0 | 927 | if (method->is_native()) { |
aoqi@0 | 928 | *location_ptr = -1; |
aoqi@0 | 929 | } else { |
aoqi@0 | 930 | *location_ptr = jvf->bci(); |
aoqi@0 | 931 | } |
aoqi@0 | 932 | *method_ptr = method->jmethod_id(); |
aoqi@0 | 933 | |
aoqi@0 | 934 | return JVMTI_ERROR_NONE; |
aoqi@0 | 935 | } |
aoqi@0 | 936 | |
aoqi@0 | 937 | |
aoqi@0 | 938 | jvmtiError |
aoqi@0 | 939 | JvmtiEnvBase::get_object_monitor_usage(JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) { |
aoqi@0 | 940 | HandleMark hm; |
aoqi@0 | 941 | Handle hobj; |
aoqi@0 | 942 | |
aoqi@0 | 943 | bool at_safepoint = SafepointSynchronize::is_at_safepoint(); |
aoqi@0 | 944 | |
aoqi@0 | 945 | // Check arguments |
aoqi@0 | 946 | { |
aoqi@0 | 947 | oop mirror = JNIHandles::resolve_external_guard(object); |
aoqi@0 | 948 | NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT); |
aoqi@0 | 949 | NULL_CHECK(info_ptr, JVMTI_ERROR_NULL_POINTER); |
aoqi@0 | 950 | |
aoqi@0 | 951 | hobj = Handle(mirror); |
aoqi@0 | 952 | } |
aoqi@0 | 953 | |
aoqi@0 | 954 | JavaThread *owning_thread = NULL; |
aoqi@0 | 955 | ObjectMonitor *mon = NULL; |
aoqi@0 | 956 | jvmtiMonitorUsage ret = { |
aoqi@0 | 957 | NULL, 0, 0, NULL, 0, NULL |
aoqi@0 | 958 | }; |
aoqi@0 | 959 | |
aoqi@0 | 960 | uint32_t debug_bits = 0; |
aoqi@0 | 961 | // first derive the object's owner and entry_count (if any) |
aoqi@0 | 962 | { |
aoqi@0 | 963 | // Revoke any biases before querying the mark word |
aoqi@0 | 964 | if (SafepointSynchronize::is_at_safepoint()) { |
aoqi@0 | 965 | BiasedLocking::revoke_at_safepoint(hobj); |
aoqi@0 | 966 | } else { |
aoqi@0 | 967 | BiasedLocking::revoke_and_rebias(hobj, false, calling_thread); |
aoqi@0 | 968 | } |
aoqi@0 | 969 | |
aoqi@0 | 970 | address owner = NULL; |
aoqi@0 | 971 | { |
aoqi@0 | 972 | markOop mark = hobj()->mark(); |
aoqi@0 | 973 | |
aoqi@0 | 974 | if (!mark->has_monitor()) { |
aoqi@0 | 975 | // this object has a lightweight monitor |
aoqi@0 | 976 | |
aoqi@0 | 977 | if (mark->has_locker()) { |
aoqi@0 | 978 | owner = (address)mark->locker(); // save the address of the Lock word |
aoqi@0 | 979 | } |
aoqi@0 | 980 | // implied else: no owner |
aoqi@0 | 981 | } else { |
aoqi@0 | 982 | // this object has a heavyweight monitor |
aoqi@0 | 983 | mon = mark->monitor(); |
aoqi@0 | 984 | |
aoqi@0 | 985 | // The owner field of a heavyweight monitor may be NULL for no |
aoqi@0 | 986 | // owner, a JavaThread * or it may still be the address of the |
aoqi@0 | 987 | // Lock word in a JavaThread's stack. A monitor can be inflated |
aoqi@0 | 988 | // by a non-owning JavaThread, but only the owning JavaThread |
aoqi@0 | 989 | // can change the owner field from the Lock word to the |
aoqi@0 | 990 | // JavaThread * and it may not have done that yet. |
aoqi@0 | 991 | owner = (address)mon->owner(); |
aoqi@0 | 992 | } |
aoqi@0 | 993 | } |
aoqi@0 | 994 | |
aoqi@0 | 995 | if (owner != NULL) { |
aoqi@0 | 996 | // This monitor is owned so we have to find the owning JavaThread. |
aoqi@0 | 997 | // Since owning_thread_from_monitor_owner() grabs a lock, GC can |
aoqi@0 | 998 | // move our object at this point. However, our owner value is safe |
aoqi@0 | 999 | // since it is either the Lock word on a stack or a JavaThread *. |
aoqi@0 | 1000 | owning_thread = Threads::owning_thread_from_monitor_owner(owner, !at_safepoint); |
aoqi@0 | 1001 | // Cannot assume (owning_thread != NULL) here because this function |
aoqi@0 | 1002 | // may not have been called at a safepoint and the owning_thread |
aoqi@0 | 1003 | // might not be suspended. |
aoqi@0 | 1004 | if (owning_thread != NULL) { |
aoqi@0 | 1005 | // The monitor's owner either has to be the current thread, at safepoint |
aoqi@0 | 1006 | // or it has to be suspended. Any of these conditions will prevent both |
aoqi@0 | 1007 | // contending and waiting threads from modifying the state of |
aoqi@0 | 1008 | // the monitor. |
aoqi@0 | 1009 | if (!at_safepoint && !JvmtiEnv::is_thread_fully_suspended(owning_thread, true, &debug_bits)) { |
aoqi@0 | 1010 | // Don't worry! This return of JVMTI_ERROR_THREAD_NOT_SUSPENDED |
aoqi@0 | 1011 | // will not make it back to the JVM/TI agent. The error code will |
aoqi@0 | 1012 | // get intercepted in JvmtiEnv::GetObjectMonitorUsage() which |
aoqi@0 | 1013 | // will retry the call via a VM_GetObjectMonitorUsage VM op. |
aoqi@0 | 1014 | return JVMTI_ERROR_THREAD_NOT_SUSPENDED; |
aoqi@0 | 1015 | } |
aoqi@0 | 1016 | HandleMark hm; |
aoqi@0 | 1017 | Handle th(owning_thread->threadObj()); |
aoqi@0 | 1018 | ret.owner = (jthread)jni_reference(calling_thread, th); |
aoqi@0 | 1019 | } |
aoqi@0 | 1020 | // implied else: no owner |
aoqi@0 | 1021 | } |
aoqi@0 | 1022 | |
aoqi@0 | 1023 | if (owning_thread != NULL) { // monitor is owned |
aoqi@0 | 1024 | if ((address)owning_thread == owner) { |
aoqi@0 | 1025 | // the owner field is the JavaThread * |
aoqi@0 | 1026 | assert(mon != NULL, |
aoqi@0 | 1027 | "must have heavyweight monitor with JavaThread * owner"); |
aoqi@0 | 1028 | ret.entry_count = mon->recursions() + 1; |
aoqi@0 | 1029 | } else { |
aoqi@0 | 1030 | // The owner field is the Lock word on the JavaThread's stack |
aoqi@0 | 1031 | // so the recursions field is not valid. We have to count the |
aoqi@0 | 1032 | // number of recursive monitor entries the hard way. We pass |
aoqi@0 | 1033 | // a handle to survive any GCs along the way. |
aoqi@0 | 1034 | ResourceMark rm; |
aoqi@0 | 1035 | ret.entry_count = count_locked_objects(owning_thread, hobj); |
aoqi@0 | 1036 | } |
aoqi@0 | 1037 | } |
aoqi@0 | 1038 | // implied else: entry_count == 0 |
aoqi@0 | 1039 | } |
aoqi@0 | 1040 | |
csahu@8316 | 1041 | int nWant = 0, nWait = 0; |
aoqi@0 | 1042 | if (mon != NULL) { |
aoqi@0 | 1043 | // this object has a heavyweight monitor |
aoqi@0 | 1044 | nWant = mon->contentions(); // # of threads contending for monitor |
aoqi@0 | 1045 | nWait = mon->waiters(); // # of threads in Object.wait() |
aoqi@0 | 1046 | ret.waiter_count = nWant + nWait; |
aoqi@0 | 1047 | ret.notify_waiter_count = nWait; |
aoqi@0 | 1048 | } else { |
aoqi@0 | 1049 | // this object has a lightweight monitor |
aoqi@0 | 1050 | ret.waiter_count = 0; |
aoqi@0 | 1051 | ret.notify_waiter_count = 0; |
aoqi@0 | 1052 | } |
aoqi@0 | 1053 | |
aoqi@0 | 1054 | // Allocate memory for heavyweight and lightweight monitor. |
aoqi@0 | 1055 | jvmtiError err; |
aoqi@0 | 1056 | err = allocate(ret.waiter_count * sizeof(jthread *), (unsigned char**)&ret.waiters); |
aoqi@0 | 1057 | if (err != JVMTI_ERROR_NONE) { |
aoqi@0 | 1058 | return err; |
aoqi@0 | 1059 | } |
aoqi@0 | 1060 | err = allocate(ret.notify_waiter_count * sizeof(jthread *), |
aoqi@0 | 1061 | (unsigned char**)&ret.notify_waiters); |
aoqi@0 | 1062 | if (err != JVMTI_ERROR_NONE) { |
aoqi@0 | 1063 | deallocate((unsigned char*)ret.waiters); |
aoqi@0 | 1064 | return err; |
aoqi@0 | 1065 | } |
aoqi@0 | 1066 | |
aoqi@0 | 1067 | // now derive the rest of the fields |
aoqi@0 | 1068 | if (mon != NULL) { |
aoqi@0 | 1069 | // this object has a heavyweight monitor |
aoqi@0 | 1070 | |
aoqi@0 | 1071 | // Number of waiters may actually be less than the waiter count. |
aoqi@0 | 1072 | // So NULL out memory so that unused memory will be NULL. |
aoqi@0 | 1073 | memset(ret.waiters, 0, ret.waiter_count * sizeof(jthread *)); |
aoqi@0 | 1074 | memset(ret.notify_waiters, 0, ret.notify_waiter_count * sizeof(jthread *)); |
aoqi@0 | 1075 | |
aoqi@0 | 1076 | if (ret.waiter_count > 0) { |
aoqi@0 | 1077 | // we have contending and/or waiting threads |
aoqi@0 | 1078 | HandleMark hm; |
aoqi@0 | 1079 | if (nWant > 0) { |
aoqi@0 | 1080 | // we have contending threads |
aoqi@0 | 1081 | ResourceMark rm; |
aoqi@0 | 1082 | // get_pending_threads returns only java thread so we do not need to |
aoqi@0 | 1083 | // check for non java threads. |
aoqi@0 | 1084 | GrowableArray<JavaThread*>* wantList = Threads::get_pending_threads( |
aoqi@0 | 1085 | nWant, (address)mon, !at_safepoint); |
aoqi@0 | 1086 | if (wantList->length() < nWant) { |
aoqi@0 | 1087 | // robustness: the pending list has gotten smaller |
aoqi@0 | 1088 | nWant = wantList->length(); |
aoqi@0 | 1089 | } |
aoqi@0 | 1090 | for (int i = 0; i < nWant; i++) { |
aoqi@0 | 1091 | JavaThread *pending_thread = wantList->at(i); |
aoqi@0 | 1092 | // If the monitor has no owner, then a non-suspended contending |
aoqi@0 | 1093 | // thread could potentially change the state of the monitor by |
aoqi@0 | 1094 | // entering it. The JVM/TI spec doesn't allow this. |
aoqi@0 | 1095 | if (owning_thread == NULL && !at_safepoint & |
aoqi@0 | 1096 | !JvmtiEnv::is_thread_fully_suspended(pending_thread, true, &debug_bits)) { |
aoqi@0 | 1097 | if (ret.owner != NULL) { |
aoqi@0 | 1098 | destroy_jni_reference(calling_thread, ret.owner); |
aoqi@0 | 1099 | } |
aoqi@0 | 1100 | for (int j = 0; j < i; j++) { |
aoqi@0 | 1101 | destroy_jni_reference(calling_thread, ret.waiters[j]); |
aoqi@0 | 1102 | } |
aoqi@0 | 1103 | deallocate((unsigned char*)ret.waiters); |
aoqi@0 | 1104 | deallocate((unsigned char*)ret.notify_waiters); |
aoqi@0 | 1105 | return JVMTI_ERROR_THREAD_NOT_SUSPENDED; |
aoqi@0 | 1106 | } |
aoqi@0 | 1107 | Handle th(pending_thread->threadObj()); |
aoqi@0 | 1108 | ret.waiters[i] = (jthread)jni_reference(calling_thread, th); |
aoqi@0 | 1109 | } |
aoqi@0 | 1110 | } |
aoqi@0 | 1111 | if (nWait > 0) { |
aoqi@0 | 1112 | // we have threads in Object.wait() |
aoqi@0 | 1113 | int offset = nWant; // add after any contending threads |
aoqi@0 | 1114 | ObjectWaiter *waiter = mon->first_waiter(); |
aoqi@0 | 1115 | for (int i = 0, j = 0; i < nWait; i++) { |
aoqi@0 | 1116 | if (waiter == NULL) { |
aoqi@0 | 1117 | // robustness: the waiting list has gotten smaller |
aoqi@0 | 1118 | nWait = j; |
aoqi@0 | 1119 | break; |
aoqi@0 | 1120 | } |
aoqi@0 | 1121 | Thread *t = mon->thread_of_waiter(waiter); |
aoqi@0 | 1122 | if (t != NULL && t->is_Java_thread()) { |
aoqi@0 | 1123 | JavaThread *wjava_thread = (JavaThread *)t; |
aoqi@0 | 1124 | // If the thread was found on the ObjectWaiter list, then |
aoqi@0 | 1125 | // it has not been notified. This thread can't change the |
aoqi@0 | 1126 | // state of the monitor so it doesn't need to be suspended. |
aoqi@0 | 1127 | Handle th(wjava_thread->threadObj()); |
aoqi@0 | 1128 | ret.waiters[offset + j] = (jthread)jni_reference(calling_thread, th); |
aoqi@0 | 1129 | ret.notify_waiters[j++] = (jthread)jni_reference(calling_thread, th); |
aoqi@0 | 1130 | } |
aoqi@0 | 1131 | waiter = mon->next_waiter(waiter); |
aoqi@0 | 1132 | } |
aoqi@0 | 1133 | } |
aoqi@0 | 1134 | } |
aoqi@0 | 1135 | |
aoqi@0 | 1136 | // Adjust count. nWant and nWait count values may be less than original. |
aoqi@0 | 1137 | ret.waiter_count = nWant + nWait; |
aoqi@0 | 1138 | ret.notify_waiter_count = nWait; |
aoqi@0 | 1139 | } else { |
aoqi@0 | 1140 | // this object has a lightweight monitor and we have nothing more |
aoqi@0 | 1141 | // to do here because the defaults are just fine. |
aoqi@0 | 1142 | } |
aoqi@0 | 1143 | |
aoqi@0 | 1144 | // we don't update return parameter unless everything worked |
aoqi@0 | 1145 | *info_ptr = ret; |
aoqi@0 | 1146 | |
aoqi@0 | 1147 | return JVMTI_ERROR_NONE; |
aoqi@0 | 1148 | } |
aoqi@0 | 1149 | |
aoqi@0 | 1150 | ResourceTracker::ResourceTracker(JvmtiEnv* env) { |
aoqi@0 | 1151 | _env = env; |
aoqi@0 | 1152 | _allocations = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<unsigned char*>(20, true); |
aoqi@0 | 1153 | _failed = false; |
aoqi@0 | 1154 | } |
aoqi@0 | 1155 | ResourceTracker::~ResourceTracker() { |
aoqi@0 | 1156 | if (_failed) { |
aoqi@0 | 1157 | for (int i=0; i<_allocations->length(); i++) { |
aoqi@0 | 1158 | _env->deallocate(_allocations->at(i)); |
aoqi@0 | 1159 | } |
aoqi@0 | 1160 | } |
aoqi@0 | 1161 | delete _allocations; |
aoqi@0 | 1162 | } |
aoqi@0 | 1163 | |
aoqi@0 | 1164 | jvmtiError ResourceTracker::allocate(jlong size, unsigned char** mem_ptr) { |
aoqi@0 | 1165 | unsigned char *ptr; |
aoqi@0 | 1166 | jvmtiError err = _env->allocate(size, &ptr); |
aoqi@0 | 1167 | if (err == JVMTI_ERROR_NONE) { |
aoqi@0 | 1168 | _allocations->append(ptr); |
aoqi@0 | 1169 | *mem_ptr = ptr; |
aoqi@0 | 1170 | } else { |
aoqi@0 | 1171 | *mem_ptr = NULL; |
aoqi@0 | 1172 | _failed = true; |
aoqi@0 | 1173 | } |
aoqi@0 | 1174 | return err; |
aoqi@0 | 1175 | } |
aoqi@0 | 1176 | |
aoqi@0 | 1177 | unsigned char* ResourceTracker::allocate(jlong size) { |
aoqi@0 | 1178 | unsigned char* ptr; |
aoqi@0 | 1179 | allocate(size, &ptr); |
aoqi@0 | 1180 | return ptr; |
aoqi@0 | 1181 | } |
aoqi@0 | 1182 | |
aoqi@0 | 1183 | char* ResourceTracker::strdup(const char* str) { |
aoqi@0 | 1184 | char *dup_str = (char*)allocate(strlen(str)+1); |
aoqi@0 | 1185 | if (dup_str != NULL) { |
aoqi@0 | 1186 | strcpy(dup_str, str); |
aoqi@0 | 1187 | } |
aoqi@0 | 1188 | return dup_str; |
aoqi@0 | 1189 | } |
aoqi@0 | 1190 | |
aoqi@0 | 1191 | struct StackInfoNode { |
aoqi@0 | 1192 | struct StackInfoNode *next; |
aoqi@0 | 1193 | jvmtiStackInfo info; |
aoqi@0 | 1194 | }; |
aoqi@0 | 1195 | |
aoqi@0 | 1196 | // Create a jvmtiStackInfo inside a linked list node and create a |
aoqi@0 | 1197 | // buffer for the frame information, both allocated as resource objects. |
aoqi@0 | 1198 | // Fill in both the jvmtiStackInfo and the jvmtiFrameInfo. |
aoqi@0 | 1199 | // Note that either or both of thr and thread_oop |
aoqi@0 | 1200 | // may be null if the thread is new or has exited. |
aoqi@0 | 1201 | void |
aoqi@0 | 1202 | VM_GetMultipleStackTraces::fill_frames(jthread jt, JavaThread *thr, oop thread_oop) { |
aoqi@0 | 1203 | assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
aoqi@0 | 1204 | |
aoqi@0 | 1205 | jint state = 0; |
aoqi@0 | 1206 | struct StackInfoNode *node = NEW_RESOURCE_OBJ(struct StackInfoNode); |
aoqi@0 | 1207 | jvmtiStackInfo *infop = &(node->info); |
aoqi@0 | 1208 | node->next = head(); |
aoqi@0 | 1209 | set_head(node); |
aoqi@0 | 1210 | infop->frame_count = 0; |
aoqi@0 | 1211 | infop->thread = jt; |
aoqi@0 | 1212 | |
aoqi@0 | 1213 | if (thread_oop != NULL) { |
aoqi@0 | 1214 | // get most state bits |
aoqi@0 | 1215 | state = (jint)java_lang_Thread::get_thread_status(thread_oop); |
aoqi@0 | 1216 | } |
aoqi@0 | 1217 | |
aoqi@0 | 1218 | if (thr != NULL) { // add more state bits if there is a JavaThead to query |
aoqi@0 | 1219 | // same as is_being_ext_suspended() but without locking |
aoqi@0 | 1220 | if (thr->is_ext_suspended() || thr->is_external_suspend()) { |
aoqi@0 | 1221 | state |= JVMTI_THREAD_STATE_SUSPENDED; |
aoqi@0 | 1222 | } |
aoqi@0 | 1223 | JavaThreadState jts = thr->thread_state(); |
aoqi@0 | 1224 | if (jts == _thread_in_native) { |
aoqi@0 | 1225 | state |= JVMTI_THREAD_STATE_IN_NATIVE; |
aoqi@0 | 1226 | } |
aoqi@0 | 1227 | OSThread* osThread = thr->osthread(); |
aoqi@0 | 1228 | if (osThread != NULL && osThread->interrupted()) { |
aoqi@0 | 1229 | state |= JVMTI_THREAD_STATE_INTERRUPTED; |
aoqi@0 | 1230 | } |
aoqi@0 | 1231 | } |
aoqi@0 | 1232 | infop->state = state; |
aoqi@0 | 1233 | |
aoqi@0 | 1234 | if (thr != NULL || (state & JVMTI_THREAD_STATE_ALIVE) != 0) { |
aoqi@0 | 1235 | infop->frame_buffer = NEW_RESOURCE_ARRAY(jvmtiFrameInfo, max_frame_count()); |
aoqi@0 | 1236 | env()->get_stack_trace(thr, 0, max_frame_count(), |
aoqi@0 | 1237 | infop->frame_buffer, &(infop->frame_count)); |
aoqi@0 | 1238 | } else { |
aoqi@0 | 1239 | infop->frame_buffer = NULL; |
aoqi@0 | 1240 | infop->frame_count = 0; |
aoqi@0 | 1241 | } |
aoqi@0 | 1242 | _frame_count_total += infop->frame_count; |
aoqi@0 | 1243 | } |
aoqi@0 | 1244 | |
aoqi@0 | 1245 | // Based on the stack information in the linked list, allocate memory |
aoqi@0 | 1246 | // block to return and fill it from the info in the linked list. |
aoqi@0 | 1247 | void |
aoqi@0 | 1248 | VM_GetMultipleStackTraces::allocate_and_fill_stacks(jint thread_count) { |
aoqi@0 | 1249 | // do I need to worry about alignment issues? |
aoqi@0 | 1250 | jlong alloc_size = thread_count * sizeof(jvmtiStackInfo) |
aoqi@0 | 1251 | + _frame_count_total * sizeof(jvmtiFrameInfo); |
aoqi@0 | 1252 | env()->allocate(alloc_size, (unsigned char **)&_stack_info); |
aoqi@0 | 1253 | |
aoqi@0 | 1254 | // pointers to move through the newly allocated space as it is filled in |
aoqi@0 | 1255 | jvmtiStackInfo *si = _stack_info + thread_count; // bottom of stack info |
aoqi@0 | 1256 | jvmtiFrameInfo *fi = (jvmtiFrameInfo *)si; // is the top of frame info |
aoqi@0 | 1257 | |
aoqi@0 | 1258 | // copy information in resource area into allocated buffer |
aoqi@0 | 1259 | // insert stack info backwards since linked list is backwards |
aoqi@0 | 1260 | // insert frame info forwards |
aoqi@0 | 1261 | // walk the StackInfoNodes |
aoqi@0 | 1262 | for (struct StackInfoNode *sin = head(); sin != NULL; sin = sin->next) { |
aoqi@0 | 1263 | jint frame_count = sin->info.frame_count; |
aoqi@0 | 1264 | size_t frames_size = frame_count * sizeof(jvmtiFrameInfo); |
aoqi@0 | 1265 | --si; |
aoqi@0 | 1266 | memcpy(si, &(sin->info), sizeof(jvmtiStackInfo)); |
aoqi@0 | 1267 | if (frames_size == 0) { |
aoqi@0 | 1268 | si->frame_buffer = NULL; |
aoqi@0 | 1269 | } else { |
aoqi@0 | 1270 | memcpy(fi, sin->info.frame_buffer, frames_size); |
aoqi@0 | 1271 | si->frame_buffer = fi; // point to the new allocated copy of the frames |
aoqi@0 | 1272 | fi += frame_count; |
aoqi@0 | 1273 | } |
aoqi@0 | 1274 | } |
aoqi@0 | 1275 | assert(si == _stack_info, "the last copied stack info must be the first record"); |
aoqi@0 | 1276 | assert((unsigned char *)fi == ((unsigned char *)_stack_info) + alloc_size, |
aoqi@0 | 1277 | "the last copied frame info must be the last record"); |
aoqi@0 | 1278 | } |
aoqi@0 | 1279 | |
aoqi@0 | 1280 | |
aoqi@0 | 1281 | void |
aoqi@0 | 1282 | VM_GetThreadListStackTraces::doit() { |
aoqi@0 | 1283 | assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
aoqi@0 | 1284 | |
aoqi@0 | 1285 | ResourceMark rm; |
aoqi@0 | 1286 | for (int i = 0; i < _thread_count; ++i) { |
aoqi@0 | 1287 | jthread jt = _thread_list[i]; |
aoqi@0 | 1288 | oop thread_oop = JNIHandles::resolve_external_guard(jt); |
aoqi@0 | 1289 | if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) { |
aoqi@0 | 1290 | set_result(JVMTI_ERROR_INVALID_THREAD); |
aoqi@0 | 1291 | return; |
aoqi@0 | 1292 | } |
aoqi@0 | 1293 | fill_frames(jt, java_lang_Thread::thread(thread_oop), thread_oop); |
aoqi@0 | 1294 | } |
aoqi@0 | 1295 | allocate_and_fill_stacks(_thread_count); |
aoqi@0 | 1296 | } |
aoqi@0 | 1297 | |
aoqi@0 | 1298 | void |
aoqi@0 | 1299 | VM_GetAllStackTraces::doit() { |
aoqi@0 | 1300 | assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
aoqi@0 | 1301 | |
aoqi@0 | 1302 | ResourceMark rm; |
aoqi@0 | 1303 | _final_thread_count = 0; |
aoqi@0 | 1304 | for (JavaThread *jt = Threads::first(); jt != NULL; jt = jt->next()) { |
aoqi@0 | 1305 | oop thread_oop = jt->threadObj(); |
aoqi@0 | 1306 | if (thread_oop != NULL && |
aoqi@0 | 1307 | !jt->is_exiting() && |
aoqi@0 | 1308 | java_lang_Thread::is_alive(thread_oop) && |
aoqi@0 | 1309 | !jt->is_hidden_from_external_view()) { |
aoqi@0 | 1310 | ++_final_thread_count; |
aoqi@0 | 1311 | // Handle block of the calling thread is used to create local refs. |
aoqi@0 | 1312 | fill_frames((jthread)JNIHandles::make_local(_calling_thread, thread_oop), |
aoqi@0 | 1313 | jt, thread_oop); |
aoqi@0 | 1314 | } |
aoqi@0 | 1315 | } |
aoqi@0 | 1316 | allocate_and_fill_stacks(_final_thread_count); |
aoqi@0 | 1317 | } |
aoqi@0 | 1318 | |
aoqi@0 | 1319 | // Verifies that the top frame is a java frame in an expected state. |
aoqi@0 | 1320 | // Deoptimizes frame if needed. |
aoqi@0 | 1321 | // Checks that the frame method signature matches the return type (tos). |
aoqi@0 | 1322 | // HandleMark must be defined in the caller only. |
aoqi@0 | 1323 | // It is to keep a ret_ob_h handle alive after return to the caller. |
aoqi@0 | 1324 | jvmtiError |
aoqi@0 | 1325 | JvmtiEnvBase::check_top_frame(JavaThread* current_thread, JavaThread* java_thread, |
aoqi@0 | 1326 | jvalue value, TosState tos, Handle* ret_ob_h) { |
aoqi@0 | 1327 | ResourceMark rm(current_thread); |
aoqi@0 | 1328 | |
aoqi@0 | 1329 | vframe *vf = vframeFor(java_thread, 0); |
aoqi@0 | 1330 | NULL_CHECK(vf, JVMTI_ERROR_NO_MORE_FRAMES); |
aoqi@0 | 1331 | |
aoqi@0 | 1332 | javaVFrame *jvf = (javaVFrame*) vf; |
aoqi@0 | 1333 | if (!vf->is_java_frame() || jvf->method()->is_native()) { |
aoqi@0 | 1334 | return JVMTI_ERROR_OPAQUE_FRAME; |
aoqi@0 | 1335 | } |
aoqi@0 | 1336 | |
aoqi@0 | 1337 | // If the frame is a compiled one, need to deoptimize it. |
aoqi@0 | 1338 | if (vf->is_compiled_frame()) { |
aoqi@0 | 1339 | if (!vf->fr().can_be_deoptimized()) { |
aoqi@0 | 1340 | return JVMTI_ERROR_OPAQUE_FRAME; |
aoqi@0 | 1341 | } |
aoqi@0 | 1342 | Deoptimization::deoptimize_frame(java_thread, jvf->fr().id()); |
aoqi@0 | 1343 | } |
aoqi@0 | 1344 | |
aoqi@0 | 1345 | // Get information about method return type |
aoqi@0 | 1346 | Symbol* signature = jvf->method()->signature(); |
aoqi@0 | 1347 | |
aoqi@0 | 1348 | ResultTypeFinder rtf(signature); |
aoqi@0 | 1349 | TosState fr_tos = as_TosState(rtf.type()); |
aoqi@0 | 1350 | if (fr_tos != tos) { |
kevinw@8368 | 1351 | if (tos != itos || (fr_tos != btos && fr_tos != ztos && fr_tos != ctos && fr_tos != stos)) { |
aoqi@0 | 1352 | return JVMTI_ERROR_TYPE_MISMATCH; |
aoqi@0 | 1353 | } |
aoqi@0 | 1354 | } |
aoqi@0 | 1355 | |
aoqi@0 | 1356 | // Check that the jobject class matches the return type signature. |
aoqi@0 | 1357 | jobject jobj = value.l; |
aoqi@0 | 1358 | if (tos == atos && jobj != NULL) { // NULL reference is allowed |
aoqi@0 | 1359 | Handle ob_h = Handle(current_thread, JNIHandles::resolve_external_guard(jobj)); |
aoqi@0 | 1360 | NULL_CHECK(ob_h, JVMTI_ERROR_INVALID_OBJECT); |
aoqi@0 | 1361 | KlassHandle ob_kh = KlassHandle(current_thread, ob_h()->klass()); |
aoqi@0 | 1362 | NULL_CHECK(ob_kh, JVMTI_ERROR_INVALID_OBJECT); |
aoqi@0 | 1363 | |
aoqi@0 | 1364 | // Method return type signature. |
aoqi@0 | 1365 | char* ty_sign = 1 + strchr(signature->as_C_string(), ')'); |
aoqi@0 | 1366 | |
aoqi@0 | 1367 | if (!VM_GetOrSetLocal::is_assignable(ty_sign, ob_kh(), current_thread)) { |
aoqi@0 | 1368 | return JVMTI_ERROR_TYPE_MISMATCH; |
aoqi@0 | 1369 | } |
aoqi@0 | 1370 | *ret_ob_h = ob_h; |
aoqi@0 | 1371 | } |
aoqi@0 | 1372 | return JVMTI_ERROR_NONE; |
aoqi@0 | 1373 | } /* end check_top_frame */ |
aoqi@0 | 1374 | |
aoqi@0 | 1375 | |
aoqi@0 | 1376 | // ForceEarlyReturn<type> follows the PopFrame approach in many aspects. |
aoqi@0 | 1377 | // Main difference is on the last stage in the interpreter. |
aoqi@0 | 1378 | // The PopFrame stops method execution to continue execution |
aoqi@0 | 1379 | // from the same method call instruction. |
aoqi@0 | 1380 | // The ForceEarlyReturn forces return from method so the execution |
aoqi@0 | 1381 | // continues at the bytecode following the method call. |
aoqi@0 | 1382 | |
aoqi@0 | 1383 | // Threads_lock NOT held, java_thread not protected by lock |
aoqi@0 | 1384 | // java_thread - pre-checked |
aoqi@0 | 1385 | |
aoqi@0 | 1386 | jvmtiError |
aoqi@0 | 1387 | JvmtiEnvBase::force_early_return(JavaThread* java_thread, jvalue value, TosState tos) { |
aoqi@0 | 1388 | JavaThread* current_thread = JavaThread::current(); |
aoqi@0 | 1389 | HandleMark hm(current_thread); |
aoqi@0 | 1390 | uint32_t debug_bits = 0; |
aoqi@0 | 1391 | |
aoqi@0 | 1392 | // retrieve or create the state |
aoqi@0 | 1393 | JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); |
aoqi@0 | 1394 | if (state == NULL) { |
aoqi@0 | 1395 | return JVMTI_ERROR_THREAD_NOT_ALIVE; |
aoqi@0 | 1396 | } |
aoqi@0 | 1397 | |
aoqi@0 | 1398 | // Check if java_thread is fully suspended |
aoqi@0 | 1399 | if (!is_thread_fully_suspended(java_thread, |
aoqi@0 | 1400 | true /* wait for suspend completion */, |
aoqi@0 | 1401 | &debug_bits)) { |
aoqi@0 | 1402 | return JVMTI_ERROR_THREAD_NOT_SUSPENDED; |
aoqi@0 | 1403 | } |
aoqi@0 | 1404 | |
aoqi@0 | 1405 | // Check to see if a ForceEarlyReturn was already in progress |
aoqi@0 | 1406 | if (state->is_earlyret_pending()) { |
aoqi@0 | 1407 | // Probably possible for JVMTI clients to trigger this, but the |
aoqi@0 | 1408 | // JPDA backend shouldn't allow this to happen |
aoqi@0 | 1409 | return JVMTI_ERROR_INTERNAL; |
aoqi@0 | 1410 | } |
aoqi@0 | 1411 | { |
aoqi@0 | 1412 | // The same as for PopFrame. Workaround bug: |
aoqi@0 | 1413 | // 4812902: popFrame hangs if the method is waiting at a synchronize |
aoqi@0 | 1414 | // Catch this condition and return an error to avoid hanging. |
aoqi@0 | 1415 | // Now JVMTI spec allows an implementation to bail out with an opaque |
aoqi@0 | 1416 | // frame error. |
aoqi@0 | 1417 | OSThread* osThread = java_thread->osthread(); |
aoqi@0 | 1418 | if (osThread->get_state() == MONITOR_WAIT) { |
aoqi@0 | 1419 | return JVMTI_ERROR_OPAQUE_FRAME; |
aoqi@0 | 1420 | } |
aoqi@0 | 1421 | } |
aoqi@0 | 1422 | Handle ret_ob_h = Handle(); |
aoqi@0 | 1423 | jvmtiError err = check_top_frame(current_thread, java_thread, value, tos, &ret_ob_h); |
aoqi@0 | 1424 | if (err != JVMTI_ERROR_NONE) { |
aoqi@0 | 1425 | return err; |
aoqi@0 | 1426 | } |
aoqi@0 | 1427 | assert(tos != atos || value.l == NULL || ret_ob_h() != NULL, |
aoqi@0 | 1428 | "return object oop must not be NULL if jobject is not NULL"); |
aoqi@0 | 1429 | |
aoqi@0 | 1430 | // Update the thread state to reflect that the top frame must be |
aoqi@0 | 1431 | // forced to return. |
aoqi@0 | 1432 | // The current frame will be returned later when the suspended |
aoqi@0 | 1433 | // thread is resumed and right before returning from VM to Java. |
aoqi@0 | 1434 | // (see call_VM_base() in assembler_<cpu>.cpp). |
aoqi@0 | 1435 | |
aoqi@0 | 1436 | state->set_earlyret_pending(); |
aoqi@0 | 1437 | state->set_earlyret_oop(ret_ob_h()); |
aoqi@0 | 1438 | state->set_earlyret_value(value, tos); |
aoqi@0 | 1439 | |
aoqi@0 | 1440 | // Set pending step flag for this early return. |
aoqi@0 | 1441 | // It is cleared when next step event is posted. |
aoqi@0 | 1442 | state->set_pending_step_for_earlyret(); |
aoqi@0 | 1443 | |
aoqi@0 | 1444 | return JVMTI_ERROR_NONE; |
aoqi@0 | 1445 | } /* end force_early_return */ |
aoqi@0 | 1446 | |
aoqi@0 | 1447 | void |
aoqi@0 | 1448 | JvmtiMonitorClosure::do_monitor(ObjectMonitor* mon) { |
aoqi@0 | 1449 | if ( _error != JVMTI_ERROR_NONE) { |
aoqi@0 | 1450 | // Error occurred in previous iteration so no need to add |
aoqi@0 | 1451 | // to the list. |
aoqi@0 | 1452 | return; |
aoqi@0 | 1453 | } |
aoqi@0 | 1454 | if (mon->owner() == _java_thread ) { |
aoqi@0 | 1455 | // Filter out on stack monitors collected during stack walk. |
aoqi@0 | 1456 | oop obj = (oop)mon->object(); |
aoqi@0 | 1457 | bool found = false; |
aoqi@0 | 1458 | for (int j = 0; j < _owned_monitors_list->length(); j++) { |
aoqi@0 | 1459 | jobject jobj = ((jvmtiMonitorStackDepthInfo*)_owned_monitors_list->at(j))->monitor; |
aoqi@0 | 1460 | oop check = JNIHandles::resolve(jobj); |
aoqi@0 | 1461 | if (check == obj) { |
aoqi@0 | 1462 | // On stack monitor already collected during the stack walk. |
aoqi@0 | 1463 | found = true; |
aoqi@0 | 1464 | break; |
aoqi@0 | 1465 | } |
aoqi@0 | 1466 | } |
aoqi@0 | 1467 | if (found == false) { |
aoqi@0 | 1468 | // This is off stack monitor (e.g. acquired via jni MonitorEnter). |
aoqi@0 | 1469 | jvmtiError err; |
aoqi@0 | 1470 | jvmtiMonitorStackDepthInfo *jmsdi; |
aoqi@0 | 1471 | err = _env->allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); |
aoqi@0 | 1472 | if (err != JVMTI_ERROR_NONE) { |
aoqi@0 | 1473 | _error = err; |
aoqi@0 | 1474 | return; |
aoqi@0 | 1475 | } |
aoqi@0 | 1476 | Handle hobj(obj); |
aoqi@0 | 1477 | jmsdi->monitor = _env->jni_reference(_calling_thread, hobj); |
aoqi@0 | 1478 | // stack depth is unknown for this monitor. |
aoqi@0 | 1479 | jmsdi->stack_depth = -1; |
aoqi@0 | 1480 | _owned_monitors_list->append(jmsdi); |
aoqi@0 | 1481 | } |
aoqi@0 | 1482 | } |
aoqi@0 | 1483 | } |