annotate src/share/vm/runtime/vm_operations.cpp @ 1563:c18cbe5936b8

6941466: Oracle rebranding changes for Hotspot repositories Summary: Change all the Sun copyrights to Oracle copyright Reviewed-by: ohair
author trims
date Thu, 27 May 2010 19:08:38 -0700
parents 5f24d0319e54
children ce6848d0666d
rev   line source
duke@0 1 /*
trims@1563 2 * Copyright (c) 1997, 2007, Oracle and/or its affiliates. All rights reserved.
duke@0 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@0 4 *
duke@0 5 * This code is free software; you can redistribute it and/or modify it
duke@0 6 * under the terms of the GNU General Public License version 2 only, as
duke@0 7 * published by the Free Software Foundation.
duke@0 8 *
duke@0 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@0 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@0 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@0 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@0 13 * accompanied this code).
duke@0 14 *
duke@0 15 * You should have received a copy of the GNU General Public License version
duke@0 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@0 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@0 18 *
trims@1563 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1563 20 * or visit www.oracle.com if you need additional information or have any
trims@1563 21 * questions.
duke@0 22 *
duke@0 23 */
duke@0 24
duke@0 25 # include "incls/_precompiled.incl"
duke@0 26 # include "incls/_vm_operations.cpp.incl"
duke@0 27
duke@0 28 #define VM_OP_NAME_INITIALIZE(name) #name,
duke@0 29
duke@0 30 const char* VM_Operation::_names[VM_Operation::VMOp_Terminating] = \
duke@0 31 { VM_OPS_DO(VM_OP_NAME_INITIALIZE) };
duke@0 32
duke@0 33 void VM_Operation::set_calling_thread(Thread* thread, ThreadPriority priority) {
duke@0 34 _calling_thread = thread;
duke@0 35 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check");
duke@0 36 _priority = priority;
duke@0 37 }
duke@0 38
duke@0 39
duke@0 40 void VM_Operation::evaluate() {
duke@0 41 ResourceMark rm;
duke@0 42 if (TraceVMOperation) {
duke@0 43 tty->print("[");
duke@0 44 NOT_PRODUCT(print();)
duke@0 45 }
duke@0 46 doit();
duke@0 47 if (TraceVMOperation) {
duke@0 48 tty->print_cr("]");
duke@0 49 }
duke@0 50 }
duke@0 51
duke@0 52 // Called by fatal error handler.
duke@0 53 void VM_Operation::print_on_error(outputStream* st) const {
duke@0 54 st->print("VM_Operation (" PTR_FORMAT "): ", this);
duke@0 55 st->print("%s", name());
duke@0 56
duke@0 57 const char* mode;
duke@0 58 switch(evaluation_mode()) {
duke@0 59 case _safepoint : mode = "safepoint"; break;
duke@0 60 case _no_safepoint : mode = "no safepoint"; break;
duke@0 61 case _concurrent : mode = "concurrent"; break;
duke@0 62 case _async_safepoint: mode = "async safepoint"; break;
duke@0 63 default : mode = "unknown"; break;
duke@0 64 }
duke@0 65 st->print(", mode: %s", mode);
duke@0 66
duke@0 67 if (calling_thread()) {
duke@0 68 st->print(", requested by thread " PTR_FORMAT, calling_thread());
duke@0 69 }
duke@0 70 }
duke@0 71
duke@0 72 void VM_ThreadStop::doit() {
duke@0 73 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
duke@0 74 JavaThread* target = java_lang_Thread::thread(target_thread());
duke@0 75 // Note that this now allows multiple ThreadDeath exceptions to be
duke@0 76 // thrown at a thread.
duke@0 77 if (target != NULL) {
duke@0 78 // the thread has run and is not already in the process of exiting
duke@0 79 target->send_thread_stop(throwable());
duke@0 80 }
duke@0 81 }
duke@0 82
duke@0 83 void VM_Deoptimize::doit() {
duke@0 84 // We do not want any GCs to happen while we are in the middle of this VM operation
duke@0 85 ResourceMark rm;
duke@0 86 DeoptimizationMarker dm;
duke@0 87
duke@0 88 // Deoptimize all activations depending on marked nmethods
duke@0 89 Deoptimization::deoptimize_dependents();
duke@0 90
duke@0 91 // Make the dependent methods zombies
duke@0 92 CodeCache::make_marked_nmethods_zombies();
duke@0 93 }
duke@0 94
duke@0 95
duke@0 96 VM_DeoptimizeFrame::VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id) {
duke@0 97 _thread = thread;
duke@0 98 _id = id;
duke@0 99 }
duke@0 100
duke@0 101
duke@0 102 void VM_DeoptimizeFrame::doit() {
duke@0 103 Deoptimization::deoptimize_frame(_thread, _id);
duke@0 104 }
duke@0 105
duke@0 106
duke@0 107 #ifndef PRODUCT
duke@0 108
duke@0 109 void VM_DeoptimizeAll::doit() {
duke@0 110 DeoptimizationMarker dm;
duke@0 111 // deoptimize all java threads in the system
duke@0 112 if (DeoptimizeALot) {
duke@0 113 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
duke@0 114 if (thread->has_last_Java_frame()) {
duke@0 115 thread->deoptimize();
duke@0 116 }
duke@0 117 }
duke@0 118 } else if (DeoptimizeRandom) {
duke@0 119
duke@0 120 // Deoptimize some selected threads and frames
duke@0 121 int tnum = os::random() & 0x3;
duke@0 122 int fnum = os::random() & 0x3;
duke@0 123 int tcount = 0;
duke@0 124 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
duke@0 125 if (thread->has_last_Java_frame()) {
duke@0 126 if (tcount++ == tnum) {
duke@0 127 tcount = 0;
duke@0 128 int fcount = 0;
duke@0 129 // Deoptimize some selected frames.
duke@0 130 // Biased llocking wants a updated register map
duke@0 131 for(StackFrameStream fst(thread, UseBiasedLocking); !fst.is_done(); fst.next()) {
duke@0 132 if (fst.current()->can_be_deoptimized()) {
duke@0 133 if (fcount++ == fnum) {
duke@0 134 fcount = 0;
duke@0 135 Deoptimization::deoptimize(thread, *fst.current(), fst.register_map());
duke@0 136 }
duke@0 137 }
duke@0 138 }
duke@0 139 }
duke@0 140 }
duke@0 141 }
duke@0 142 }
duke@0 143 }
duke@0 144
duke@0 145
duke@0 146 void VM_ZombieAll::doit() {
duke@0 147 JavaThread *thread = (JavaThread *)calling_thread();
duke@0 148 assert(thread->is_Java_thread(), "must be a Java thread");
duke@0 149 thread->make_zombies();
duke@0 150 }
duke@0 151
duke@0 152 #endif // !PRODUCT
duke@0 153
kvn@1284 154 void VM_HandleFullCodeCache::doit() {
kvn@1284 155 NMethodSweeper::speculative_disconnect_nmethods(_is_full);
kvn@1284 156 }
kvn@1284 157
duke@0 158 void VM_Verify::doit() {
duke@0 159 Universe::verify();
duke@0 160 }
duke@0 161
duke@0 162 bool VM_PrintThreads::doit_prologue() {
duke@0 163 assert(Thread::current()->is_Java_thread(), "just checking");
duke@0 164
duke@0 165 // Make sure AbstractOwnableSynchronizer is loaded
duke@0 166 if (JDK_Version::is_gte_jdk16x_version()) {
duke@0 167 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
duke@0 168 }
duke@0 169
duke@0 170 // Get Heap_lock if concurrent locks will be dumped
duke@0 171 if (_print_concurrent_locks) {
duke@0 172 Heap_lock->lock();
duke@0 173 }
duke@0 174 return true;
duke@0 175 }
duke@0 176
duke@0 177 void VM_PrintThreads::doit() {
duke@0 178 Threads::print_on(_out, true, false, _print_concurrent_locks);
duke@0 179 }
duke@0 180
duke@0 181 void VM_PrintThreads::doit_epilogue() {
duke@0 182 if (_print_concurrent_locks) {
duke@0 183 // Release Heap_lock
duke@0 184 Heap_lock->unlock();
duke@0 185 }
duke@0 186 }
duke@0 187
duke@0 188 void VM_PrintJNI::doit() {
duke@0 189 JNIHandles::print_on(_out);
duke@0 190 }
duke@0 191
duke@0 192 VM_FindDeadlocks::~VM_FindDeadlocks() {
duke@0 193 if (_deadlocks != NULL) {
duke@0 194 DeadlockCycle* cycle = _deadlocks;
duke@0 195 while (cycle != NULL) {
duke@0 196 DeadlockCycle* d = cycle;
duke@0 197 cycle = cycle->next();
duke@0 198 delete d;
duke@0 199 }
duke@0 200 }
duke@0 201 }
duke@0 202
duke@0 203 bool VM_FindDeadlocks::doit_prologue() {
duke@0 204 assert(Thread::current()->is_Java_thread(), "just checking");
duke@0 205
duke@0 206 // Load AbstractOwnableSynchronizer class
duke@0 207 if (_concurrent_locks && JDK_Version::is_gte_jdk16x_version()) {
duke@0 208 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
duke@0 209 }
duke@0 210
duke@0 211 return true;
duke@0 212 }
duke@0 213
duke@0 214 void VM_FindDeadlocks::doit() {
duke@0 215 _deadlocks = ThreadService::find_deadlocks_at_safepoint(_concurrent_locks);
duke@0 216 if (_out != NULL) {
duke@0 217 int num_deadlocks = 0;
duke@0 218 for (DeadlockCycle* cycle = _deadlocks; cycle != NULL; cycle = cycle->next()) {
duke@0 219 num_deadlocks++;
duke@0 220 cycle->print_on(_out);
duke@0 221 }
duke@0 222
duke@0 223 if (num_deadlocks == 1) {
duke@0 224 _out->print_cr("\nFound 1 deadlock.\n");
duke@0 225 _out->flush();
duke@0 226 } else if (num_deadlocks > 1) {
duke@0 227 _out->print_cr("\nFound %d deadlocks.\n", num_deadlocks);
duke@0 228 _out->flush();
duke@0 229 }
duke@0 230 }
duke@0 231 }
duke@0 232
duke@0 233 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result,
duke@0 234 int max_depth,
duke@0 235 bool with_locked_monitors,
duke@0 236 bool with_locked_synchronizers) {
duke@0 237 _result = result;
duke@0 238 _num_threads = 0; // 0 indicates all threads
duke@0 239 _threads = NULL;
duke@0 240 _result = result;
duke@0 241 _max_depth = max_depth;
duke@0 242 _with_locked_monitors = with_locked_monitors;
duke@0 243 _with_locked_synchronizers = with_locked_synchronizers;
duke@0 244 }
duke@0 245
duke@0 246 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result,
duke@0 247 GrowableArray<instanceHandle>* threads,
duke@0 248 int num_threads,
duke@0 249 int max_depth,
duke@0 250 bool with_locked_monitors,
duke@0 251 bool with_locked_synchronizers) {
duke@0 252 _result = result;
duke@0 253 _num_threads = num_threads;
duke@0 254 _threads = threads;
duke@0 255 _result = result;
duke@0 256 _max_depth = max_depth;
duke@0 257 _with_locked_monitors = with_locked_monitors;
duke@0 258 _with_locked_synchronizers = with_locked_synchronizers;
duke@0 259 }
duke@0 260
duke@0 261 bool VM_ThreadDump::doit_prologue() {
duke@0 262 assert(Thread::current()->is_Java_thread(), "just checking");
duke@0 263
duke@0 264 // Load AbstractOwnableSynchronizer class before taking thread snapshots
duke@0 265 if (JDK_Version::is_gte_jdk16x_version()) {
duke@0 266 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
duke@0 267 }
duke@0 268
duke@0 269 if (_with_locked_synchronizers) {
duke@0 270 // Acquire Heap_lock to dump concurrent locks
duke@0 271 Heap_lock->lock();
duke@0 272 }
duke@0 273
duke@0 274 return true;
duke@0 275 }
duke@0 276
duke@0 277 void VM_ThreadDump::doit_epilogue() {
duke@0 278 if (_with_locked_synchronizers) {
duke@0 279 // Release Heap_lock
duke@0 280 Heap_lock->unlock();
duke@0 281 }
duke@0 282 }
duke@0 283
duke@0 284 void VM_ThreadDump::doit() {
duke@0 285 ResourceMark rm;
duke@0 286
duke@0 287 ConcurrentLocksDump concurrent_locks(true);
duke@0 288 if (_with_locked_synchronizers) {
duke@0 289 concurrent_locks.dump_at_safepoint();
duke@0 290 }
duke@0 291
duke@0 292 if (_num_threads == 0) {
duke@0 293 // Snapshot all live threads
duke@0 294 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) {
duke@0 295 if (jt->is_exiting() ||
duke@0 296 jt->is_hidden_from_external_view()) {
duke@0 297 // skip terminating threads and hidden threads
duke@0 298 continue;
duke@0 299 }
duke@0 300 ThreadConcurrentLocks* tcl = NULL;
duke@0 301 if (_with_locked_synchronizers) {
duke@0 302 tcl = concurrent_locks.thread_concurrent_locks(jt);
duke@0 303 }
duke@0 304 ThreadSnapshot* ts = snapshot_thread(jt, tcl);
duke@0 305 _result->add_thread_snapshot(ts);
duke@0 306 }
duke@0 307 } else {
duke@0 308 // Snapshot threads in the given _threads array
duke@0 309 // A dummy snapshot is created if a thread doesn't exist
duke@0 310 for (int i = 0; i < _num_threads; i++) {
duke@0 311 instanceHandle th = _threads->at(i);
duke@0 312 if (th() == NULL) {
duke@0 313 // skip if the thread doesn't exist
duke@0 314 // Add a dummy snapshot
duke@0 315 _result->add_thread_snapshot(new ThreadSnapshot());
duke@0 316 continue;
duke@0 317 }
duke@0 318
duke@0 319 // Dump thread stack only if the thread is alive and not exiting
duke@0 320 // and not VM internal thread.
duke@0 321 JavaThread* jt = java_lang_Thread::thread(th());
duke@0 322 if (jt == NULL || /* thread not alive */
duke@0 323 jt->is_exiting() ||
duke@0 324 jt->is_hidden_from_external_view()) {
duke@0 325 // add a NULL snapshot if skipped
duke@0 326 _result->add_thread_snapshot(new ThreadSnapshot());
duke@0 327 continue;
duke@0 328 }
duke@0 329 ThreadConcurrentLocks* tcl = NULL;
duke@0 330 if (_with_locked_synchronizers) {
duke@0 331 tcl = concurrent_locks.thread_concurrent_locks(jt);
duke@0 332 }
duke@0 333 ThreadSnapshot* ts = snapshot_thread(jt, tcl);
duke@0 334 _result->add_thread_snapshot(ts);
duke@0 335 }
duke@0 336 }
duke@0 337 }
duke@0 338
duke@0 339 ThreadSnapshot* VM_ThreadDump::snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl) {
duke@0 340 ThreadSnapshot* snapshot = new ThreadSnapshot(java_thread);
duke@0 341 snapshot->dump_stack_at_safepoint(_max_depth, _with_locked_monitors);
duke@0 342 snapshot->set_concurrent_locks(tcl);
duke@0 343 return snapshot;
duke@0 344 }
duke@0 345
duke@0 346 volatile bool VM_Exit::_vm_exited = false;
duke@0 347 Thread * VM_Exit::_shutdown_thread = NULL;
duke@0 348
duke@0 349 int VM_Exit::set_vm_exited() {
duke@0 350 Thread * thr_cur = ThreadLocalStorage::get_thread_slow();
duke@0 351
duke@0 352 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already");
duke@0 353
duke@0 354 int num_active = 0;
duke@0 355
duke@0 356 _shutdown_thread = thr_cur;
duke@0 357 _vm_exited = true; // global flag
duke@0 358 for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next())
duke@0 359 if (thr!=thr_cur && thr->thread_state() == _thread_in_native) {
duke@0 360 ++num_active;
duke@0 361 thr->set_terminated(JavaThread::_vm_exited); // per-thread flag
duke@0 362 }
duke@0 363
duke@0 364 return num_active;
duke@0 365 }
duke@0 366
duke@0 367 int VM_Exit::wait_for_threads_in_native_to_block() {
duke@0 368 // VM exits at safepoint. This function must be called at the final safepoint
duke@0 369 // to wait for threads in _thread_in_native state to be quiescent.
duke@0 370 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already");
duke@0 371
duke@0 372 Thread * thr_cur = ThreadLocalStorage::get_thread_slow();
duke@0 373 Monitor timer(Mutex::leaf, "VM_Exit timer", true);
duke@0 374
duke@0 375 // Compiler threads need longer wait because they can access VM data directly
duke@0 376 // while in native. If they are active and some structures being used are
duke@0 377 // deleted by the shutdown sequence, they will crash. On the other hand, user
duke@0 378 // threads must go through native=>Java/VM transitions first to access VM
duke@0 379 // data, and they will be stopped during state transition. In theory, we
duke@0 380 // don't have to wait for user threads to be quiescent, but it's always
duke@0 381 // better to terminate VM when current thread is the only active thread, so
duke@0 382 // wait for user threads too. Numbers are in 10 milliseconds.
duke@0 383 int max_wait_user_thread = 30; // at least 300 milliseconds
duke@0 384 int max_wait_compiler_thread = 1000; // at least 10 seconds
duke@0 385
duke@0 386 int max_wait = max_wait_compiler_thread;
duke@0 387
duke@0 388 int attempts = 0;
duke@0 389 while (true) {
duke@0 390 int num_active = 0;
duke@0 391 int num_active_compiler_thread = 0;
duke@0 392
duke@0 393 for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next()) {
duke@0 394 if (thr!=thr_cur && thr->thread_state() == _thread_in_native) {
duke@0 395 num_active++;
duke@0 396 if (thr->is_Compiler_thread()) {
duke@0 397 num_active_compiler_thread++;
duke@0 398 }
duke@0 399 }
duke@0 400 }
duke@0 401
duke@0 402 if (num_active == 0) {
duke@0 403 return 0;
duke@0 404 } else if (attempts > max_wait) {
duke@0 405 return num_active;
duke@0 406 } else if (num_active_compiler_thread == 0 && attempts > max_wait_user_thread) {
duke@0 407 return num_active;
duke@0 408 }
duke@0 409
duke@0 410 attempts++;
duke@0 411
duke@0 412 MutexLockerEx ml(&timer, Mutex::_no_safepoint_check_flag);
duke@0 413 timer.wait(Mutex::_no_safepoint_check_flag, 10);
duke@0 414 }
duke@0 415 }
duke@0 416
duke@0 417 void VM_Exit::doit() {
duke@0 418 CompileBroker::set_should_block();
duke@0 419
duke@0 420 // Wait for a short period for threads in native to block. Any thread
duke@0 421 // still executing native code after the wait will be stopped at
duke@0 422 // native==>Java/VM barriers.
duke@0 423 // Among 16276 JCK tests, 94% of them come here without any threads still
duke@0 424 // running in native; the other 6% are quiescent within 250ms (Ultra 80).
duke@0 425 wait_for_threads_in_native_to_block();
duke@0 426
duke@0 427 set_vm_exited();
duke@0 428
duke@0 429 // cleanup globals resources before exiting. exit_globals() currently
duke@0 430 // cleans up outputStream resources and PerfMemory resources.
duke@0 431 exit_globals();
duke@0 432
duke@0 433 // Check for exit hook
duke@0 434 exit_hook_t exit_hook = Arguments::exit_hook();
duke@0 435 if (exit_hook != NULL) {
duke@0 436 // exit hook should exit.
duke@0 437 exit_hook(_exit_code);
duke@0 438 // ... but if it didn't, we must do it here
duke@0 439 vm_direct_exit(_exit_code);
duke@0 440 } else {
duke@0 441 vm_direct_exit(_exit_code);
duke@0 442 }
duke@0 443 }
duke@0 444
duke@0 445
duke@0 446 void VM_Exit::wait_if_vm_exited() {
duke@0 447 if (_vm_exited &&
duke@0 448 ThreadLocalStorage::get_thread_slow() != _shutdown_thread) {
duke@0 449 // _vm_exited is set at safepoint, and the Threads_lock is never released
duke@0 450 // we will block here until the process dies
duke@0 451 Threads_lock->lock_without_safepoint_check();
duke@0 452 ShouldNotReachHere();
duke@0 453 }
duke@0 454 }