rev 54621 : imported patch 8221734-v1

   1 /*
   2  * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/symbolTable.hpp"
  27 #include "classfile/vmSymbols.hpp"
  28 #include "code/codeCache.hpp"
  29 #include "compiler/compileBroker.hpp"
  30 #include "gc/shared/isGCActiveMark.hpp"
  31 #include "logging/log.hpp"
  32 #include "logging/logStream.hpp"
  33 #include "memory/heapInspection.hpp"
  34 #include "memory/resourceArea.hpp"
  35 #include "oops/symbol.hpp"
  36 #include "runtime/arguments.hpp"
  37 #include "runtime/deoptimization.hpp"
  38 #include "runtime/frame.inline.hpp"
  39 #include "runtime/interfaceSupport.inline.hpp"
  40 #include "runtime/sweeper.hpp"
  41 #include "runtime/thread.inline.hpp"
  42 #include "runtime/threadSMR.inline.hpp"
  43 #include "runtime/vmOperations.hpp"
  44 #include "services/threadService.hpp"
  45 
  46 #define VM_OP_NAME_INITIALIZE(name) #name,
  47 
  48 const char* VM_Operation::_names[VM_Operation::VMOp_Terminating] = \
  49   { VM_OPS_DO(VM_OP_NAME_INITIALIZE) };
  50 
  51 void VM_Operation::set_calling_thread(Thread* thread, ThreadPriority priority) {
  52   _calling_thread = thread;
  53   assert(MinPriority <= priority && priority <= MaxPriority, "sanity check");
  54   _priority = priority;
  55 }
  56 
  57 
  58 void VM_Operation::evaluate() {
  59   ResourceMark rm;
  60   LogTarget(Debug, vmoperation) lt;
  61   if (lt.is_enabled()) {
  62     LogStream ls(lt);
  63     ls.print("begin ");
  64     print_on_error(&ls);
  65     ls.cr();
  66   }
  67   doit();
  68   if (lt.is_enabled()) {
  69     LogStream ls(lt);
  70     ls.print("end ");
  71     print_on_error(&ls);
  72     ls.cr();
  73   }
  74 }
  75 
  76 const char* VM_Operation::mode_to_string(Mode mode) {
  77   switch(mode) {
  78     case _safepoint      : return "safepoint";
  79     case _no_safepoint   : return "no safepoint";
  80     case _concurrent     : return "concurrent";
  81     case _async_safepoint: return "async safepoint";
  82     default              : return "unknown";
  83   }
  84 }
  85 // Called by fatal error handler.
  86 void VM_Operation::print_on_error(outputStream* st) const {
  87   st->print("VM_Operation (" PTR_FORMAT "): ", p2i(this));
  88   st->print("%s", name());
  89 
  90   const char* mode = mode_to_string(evaluation_mode());
  91   st->print(", mode: %s", mode);
  92 
  93   if (calling_thread()) {
  94     st->print(", requested by thread " PTR_FORMAT, p2i(calling_thread()));
  95   }
  96 }
  97 
  98 void VM_ThreadStop::doit() {
  99   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
 100   ThreadsListHandle tlh;
 101   JavaThread* target = java_lang_Thread::thread(target_thread());
 102   // Note that this now allows multiple ThreadDeath exceptions to be
 103   // thrown at a thread.
 104   if (target != NULL && (!EnableThreadSMRExtraValidityChecks || tlh.includes(target))) {
 105     // The target thread has run and has not exited yet.
 106     target->send_thread_stop(throwable());
 107   }
 108 }
 109 
 110 void VM_ClearICs::doit() {
 111   if (_preserve_static_stubs) {
 112     CodeCache::cleanup_inline_caches();
 113   } else {
 114     CodeCache::clear_inline_caches();
 115   }
 116 }
 117 












 118 void VM_MarkActiveNMethods::doit() {
 119   NMethodSweeper::mark_active_nmethods();
 120 }
 121 
 122 VM_DeoptimizeFrame::VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id, int reason) {
 123   _thread = thread;
 124   _id     = id;
 125   _reason = reason;
 126 }
 127 
 128 
 129 void VM_DeoptimizeFrame::doit() {
 130   assert(_reason > Deoptimization::Reason_none && _reason < Deoptimization::Reason_LIMIT, "invalid deopt reason");
 131   Deoptimization::deoptimize_frame_internal(_thread, _id, (Deoptimization::DeoptReason)_reason);
 132 }
 133 
 134 
 135 #ifndef PRODUCT
 136 
 137 void VM_DeoptimizeAll::doit() {
 138   DeoptimizationMarker dm;
 139   JavaThreadIteratorWithHandle jtiwh;
 140   // deoptimize all java threads in the system
 141   if (DeoptimizeALot) {
 142     for (; JavaThread *thread = jtiwh.next(); ) {
 143       if (thread->has_last_Java_frame()) {
 144         thread->deoptimize();
 145       }
 146     }
 147   } else if (DeoptimizeRandom) {
 148 
 149     // Deoptimize some selected threads and frames
 150     int tnum = os::random() & 0x3;
 151     int fnum =  os::random() & 0x3;
 152     int tcount = 0;
 153     for (; JavaThread *thread = jtiwh.next(); ) {
 154       if (thread->has_last_Java_frame()) {
 155         if (tcount++ == tnum)  {
 156         tcount = 0;
 157           int fcount = 0;
 158           // Deoptimize some selected frames.
 159           // Biased llocking wants a updated register map
 160           for(StackFrameStream fst(thread, UseBiasedLocking); !fst.is_done(); fst.next()) {
 161             if (fst.current()->can_be_deoptimized()) {
 162               if (fcount++ == fnum) {
 163                 fcount = 0;
 164                 Deoptimization::deoptimize(thread, *fst.current(), fst.register_map());
 165               }
 166             }
 167           }
 168         }
 169       }
 170     }
 171   }
 172 }
 173 
 174 
 175 void VM_ZombieAll::doit() {
 176   JavaThread *thread = (JavaThread *)calling_thread();
 177   assert(thread->is_Java_thread(), "must be a Java thread");
 178   thread->make_zombies();
 179 }
 180 
 181 #endif // !PRODUCT
 182 
 183 void VM_Verify::doit() {
 184   Universe::heap()->prepare_for_verify();
 185   Universe::verify();
 186 }
 187 
 188 bool VM_PrintThreads::doit_prologue() {
 189   // Get Heap_lock if concurrent locks will be dumped
 190   if (_print_concurrent_locks) {
 191     Heap_lock->lock();
 192   }
 193   return true;
 194 }
 195 
 196 void VM_PrintThreads::doit() {
 197   Threads::print_on(_out, true, false, _print_concurrent_locks, _print_extended_info);
 198 }
 199 
 200 void VM_PrintThreads::doit_epilogue() {
 201   if (_print_concurrent_locks) {
 202     // Release Heap_lock
 203     Heap_lock->unlock();
 204   }
 205 }
 206 
 207 void VM_PrintJNI::doit() {
 208   JNIHandles::print_on(_out);
 209 }
 210 
 211 void VM_PrintMetadata::doit() {
 212   MetaspaceUtils::print_report(_out, _scale, _flags);
 213 }
 214 
 215 VM_FindDeadlocks::~VM_FindDeadlocks() {
 216   if (_deadlocks != NULL) {
 217     DeadlockCycle* cycle = _deadlocks;
 218     while (cycle != NULL) {
 219       DeadlockCycle* d = cycle;
 220       cycle = cycle->next();
 221       delete d;
 222     }
 223   }
 224 }
 225 
 226 void VM_FindDeadlocks::doit() {
 227   // Update the hazard ptr in the originating thread to the current
 228   // list of threads. This VM operation needs the current list of
 229   // threads for proper deadlock detection and those are the
 230   // JavaThreads we need to be protected when we return info to the
 231   // originating thread.
 232   _setter.set();
 233 
 234   _deadlocks = ThreadService::find_deadlocks_at_safepoint(_setter.list(), _concurrent_locks);
 235   if (_out != NULL) {
 236     int num_deadlocks = 0;
 237     for (DeadlockCycle* cycle = _deadlocks; cycle != NULL; cycle = cycle->next()) {
 238       num_deadlocks++;
 239       cycle->print_on_with(_setter.list(), _out);
 240     }
 241 
 242     if (num_deadlocks == 1) {
 243       _out->print_cr("\nFound 1 deadlock.\n");
 244       _out->flush();
 245     } else if (num_deadlocks > 1) {
 246       _out->print_cr("\nFound %d deadlocks.\n", num_deadlocks);
 247       _out->flush();
 248     }
 249   }
 250 }
 251 
 252 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result,
 253                              int max_depth,
 254                              bool with_locked_monitors,
 255                              bool with_locked_synchronizers) {
 256   _result = result;
 257   _num_threads = 0; // 0 indicates all threads
 258   _threads = NULL;
 259   _result = result;
 260   _max_depth = max_depth;
 261   _with_locked_monitors = with_locked_monitors;
 262   _with_locked_synchronizers = with_locked_synchronizers;
 263 }
 264 
 265 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result,
 266                              GrowableArray<instanceHandle>* threads,
 267                              int num_threads,
 268                              int max_depth,
 269                              bool with_locked_monitors,
 270                              bool with_locked_synchronizers) {
 271   _result = result;
 272   _num_threads = num_threads;
 273   _threads = threads;
 274   _result = result;
 275   _max_depth = max_depth;
 276   _with_locked_monitors = with_locked_monitors;
 277   _with_locked_synchronizers = with_locked_synchronizers;
 278 }
 279 
 280 bool VM_ThreadDump::doit_prologue() {
 281   if (_with_locked_synchronizers) {
 282     // Acquire Heap_lock to dump concurrent locks
 283     Heap_lock->lock();
 284   }
 285 
 286   return true;
 287 }
 288 
 289 void VM_ThreadDump::doit_epilogue() {
 290   if (_with_locked_synchronizers) {
 291     // Release Heap_lock
 292     Heap_lock->unlock();
 293   }
 294 }
 295 
 296 void VM_ThreadDump::doit() {
 297   ResourceMark rm;
 298 
 299   // Set the hazard ptr in the originating thread to protect the
 300   // current list of threads. This VM operation needs the current list
 301   // of threads for a proper dump and those are the JavaThreads we need
 302   // to be protected when we return info to the originating thread.
 303   _result->set_t_list();
 304 
 305   ConcurrentLocksDump concurrent_locks(true);
 306   if (_with_locked_synchronizers) {
 307     concurrent_locks.dump_at_safepoint();
 308   }
 309 
 310   if (_num_threads == 0) {
 311     // Snapshot all live threads
 312 
 313     for (uint i = 0; i < _result->t_list()->length(); i++) {
 314       JavaThread* jt = _result->t_list()->thread_at(i);
 315       if (jt->is_exiting() ||
 316           jt->is_hidden_from_external_view())  {
 317         // skip terminating threads and hidden threads
 318         continue;
 319       }
 320       ThreadConcurrentLocks* tcl = NULL;
 321       if (_with_locked_synchronizers) {
 322         tcl = concurrent_locks.thread_concurrent_locks(jt);
 323       }
 324       snapshot_thread(jt, tcl);
 325     }
 326   } else {
 327     // Snapshot threads in the given _threads array
 328     // A dummy snapshot is created if a thread doesn't exist
 329 
 330     for (int i = 0; i < _num_threads; i++) {
 331       instanceHandle th = _threads->at(i);
 332       if (th() == NULL) {
 333         // skip if the thread doesn't exist
 334         // Add a dummy snapshot
 335         _result->add_thread_snapshot();
 336         continue;
 337       }
 338 
 339       // Dump thread stack only if the thread is alive and not exiting
 340       // and not VM internal thread.
 341       JavaThread* jt = java_lang_Thread::thread(th());
 342       if (jt != NULL && !_result->t_list()->includes(jt)) {
 343         // _threads[i] doesn't refer to a valid JavaThread; this check
 344         // is primarily for JVM_DumpThreads() which doesn't have a good
 345         // way to validate the _threads array.
 346         jt = NULL;
 347       }
 348       if (jt == NULL || /* thread not alive */
 349           jt->is_exiting() ||
 350           jt->is_hidden_from_external_view())  {
 351         // add a NULL snapshot if skipped
 352         _result->add_thread_snapshot();
 353         continue;
 354       }
 355       ThreadConcurrentLocks* tcl = NULL;
 356       if (_with_locked_synchronizers) {
 357         tcl = concurrent_locks.thread_concurrent_locks(jt);
 358       }
 359       snapshot_thread(jt, tcl);
 360     }
 361   }
 362 }
 363 
 364 void VM_ThreadDump::snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl) {
 365   ThreadSnapshot* snapshot = _result->add_thread_snapshot(java_thread);
 366   snapshot->dump_stack_at_safepoint(_max_depth, _with_locked_monitors);
 367   snapshot->set_concurrent_locks(tcl);
 368 }
 369 
 370 volatile bool VM_Exit::_vm_exited = false;
 371 Thread * volatile VM_Exit::_shutdown_thread = NULL;
 372 
 373 int VM_Exit::set_vm_exited() {
 374 
 375   Thread * thr_cur = Thread::current();
 376 
 377   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already");
 378 
 379   int num_active = 0;
 380 
 381   _shutdown_thread = thr_cur;
 382   _vm_exited = true;                                // global flag
 383   for (JavaThreadIteratorWithHandle jtiwh; JavaThread *thr = jtiwh.next(); ) {
 384     if (thr!=thr_cur && thr->thread_state() == _thread_in_native) {
 385       ++num_active;
 386       thr->set_terminated(JavaThread::_vm_exited);  // per-thread flag
 387     }
 388   }
 389 
 390   return num_active;
 391 }
 392 
 393 int VM_Exit::wait_for_threads_in_native_to_block() {
 394   // VM exits at safepoint. This function must be called at the final safepoint
 395   // to wait for threads in _thread_in_native state to be quiescent.
 396   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already");
 397 
 398   Thread * thr_cur = Thread::current();
 399   Monitor timer(Mutex::leaf, "VM_Exit timer", true,
 400                 Monitor::_safepoint_check_never);
 401 
 402   // Compiler threads need longer wait because they can access VM data directly
 403   // while in native. If they are active and some structures being used are
 404   // deleted by the shutdown sequence, they will crash. On the other hand, user
 405   // threads must go through native=>Java/VM transitions first to access VM
 406   // data, and they will be stopped during state transition. In theory, we
 407   // don't have to wait for user threads to be quiescent, but it's always
 408   // better to terminate VM when current thread is the only active thread, so
 409   // wait for user threads too. Numbers are in 10 milliseconds.
 410   int max_wait_user_thread = 30;                  // at least 300 milliseconds
 411   int max_wait_compiler_thread = 1000;            // at least 10 seconds
 412 
 413   int max_wait = max_wait_compiler_thread;
 414 
 415   int attempts = 0;
 416   JavaThreadIteratorWithHandle jtiwh;
 417   while (true) {
 418     int num_active = 0;
 419     int num_active_compiler_thread = 0;
 420 
 421     jtiwh.rewind();
 422     for (; JavaThread *thr = jtiwh.next(); ) {
 423       if (thr!=thr_cur && thr->thread_state() == _thread_in_native) {
 424         num_active++;
 425         if (thr->is_Compiler_thread()) {
 426           num_active_compiler_thread++;
 427         }
 428       }
 429     }
 430 
 431     if (num_active == 0) {
 432        return 0;
 433     } else if (attempts > max_wait) {
 434        return num_active;
 435     } else if (num_active_compiler_thread == 0 && attempts > max_wait_user_thread) {
 436        return num_active;
 437     }
 438 
 439     attempts++;
 440 
 441     MutexLockerEx ml(&timer, Mutex::_no_safepoint_check_flag);
 442     timer.wait(Mutex::_no_safepoint_check_flag, 10);
 443   }
 444 }
 445 
 446 void VM_Exit::doit() {
 447   CompileBroker::set_should_block();
 448 
 449   // Wait for a short period for threads in native to block. Any thread
 450   // still executing native code after the wait will be stopped at
 451   // native==>Java/VM barriers.
 452   // Among 16276 JCK tests, 94% of them come here without any threads still
 453   // running in native; the other 6% are quiescent within 250ms (Ultra 80).
 454   wait_for_threads_in_native_to_block();
 455 
 456   set_vm_exited();
 457 
 458   // cleanup globals resources before exiting. exit_globals() currently
 459   // cleans up outputStream resources and PerfMemory resources.
 460   exit_globals();
 461 
 462   // Check for exit hook
 463   exit_hook_t exit_hook = Arguments::exit_hook();
 464   if (exit_hook != NULL) {
 465     // exit hook should exit.
 466     exit_hook(_exit_code);
 467     // ... but if it didn't, we must do it here
 468     vm_direct_exit(_exit_code);
 469   } else {
 470     vm_direct_exit(_exit_code);
 471   }
 472 }
 473 
 474 
 475 void VM_Exit::wait_if_vm_exited() {
 476   if (_vm_exited &&
 477       Thread::current_or_null() != _shutdown_thread) {
 478     // _vm_exited is set at safepoint, and the Threads_lock is never released
 479     // we will block here until the process dies
 480     Threads_lock->lock_without_safepoint_check();
 481     ShouldNotReachHere();
 482   }
 483 }
 484 
 485 void VM_PrintCompileQueue::doit() {
 486   CompileBroker::print_compile_queues(_out);
 487 }
 488 
 489 #if INCLUDE_SERVICES
 490 void VM_PrintClassHierarchy::doit() {
 491   KlassHierarchy::print_class_hierarchy(_out, _print_interfaces, _print_subclasses, _classname);
 492 }
 493 #endif
--- EOF ---