jdk8-mips64-public/hotspot: src/share/vm/runtime/vm_operations.cpp@248ff38d2950 (annotated)

src/share/vm/runtime/vm_operations.cpp@248ff38d2950 (annotated)

src/share/vm/runtime/vm_operations.cpp

Fri, 28 Mar 2014 10:13:37 -0700

author: vlivanov
date: Fri, 28 Mar 2014 10:13:37 -0700
changeset 6528: 248ff38d2950
parent 5792: 510fbd28919c
child 6680: 78bbf4d43a14
permissions: -rw-r--r--

8035828: Turn on @Stable support in VM
Reviewed-by: jrose, twisti

 /*
  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/symbolTable.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "compiler/compileBroker.hpp"
 #include "compiler/compilerOracle.hpp"
 #include "gc_implementation/shared/isGCActiveMark.hpp"
 #include "memory/resourceArea.hpp"
 #include "oops/symbol.hpp"
 #include "runtime/arguments.hpp"
 #include "runtime/deoptimization.hpp"
 #include "runtime/interfaceSupport.hpp"
 #include "runtime/sweeper.hpp"
 #include "runtime/thread.inline.hpp"
 #include "runtime/vm_operations.hpp"
 #include "services/threadService.hpp"
 #include "trace/tracing.hpp"
 #define VM_OP_NAME_INITIALIZE(name) #name,
 const char* VM_Operation::_names[VM_Operation::VMOp_Terminating] = \
   { VM_OPS_DO(VM_OP_NAME_INITIALIZE) };
 void VM_Operation::set_calling_thread(Thread* thread, ThreadPriority priority) {
   _calling_thread = thread;
   assert(MinPriority <= priority && priority <= MaxPriority, "sanity check");
   _priority = priority;
 }
 void VM_Operation::evaluate() {
   ResourceMark rm;
   if (TraceVMOperation) {
     tty->print("[");
     NOT_PRODUCT(print();)
   }
   doit();
   if (TraceVMOperation) {
     tty->print_cr("]");
   }
 }
 const char* VM_Operation::mode_to_string(Mode mode) {
   switch(mode) {
     case _safepoint      : return "safepoint";
     case _no_safepoint   : return "no safepoint";
     case _concurrent     : return "concurrent";
     case _async_safepoint: return "async safepoint";
     default              : return "unknown";
   }
 }
 // Called by fatal error handler.
 void VM_Operation::print_on_error(outputStream* st) const {
   st->print("VM_Operation (" PTR_FORMAT "): ", this);
   st->print("%s", name());
   const char* mode = mode_to_string(evaluation_mode());
   st->print(", mode: %s", mode);
   if (calling_thread()) {
     st->print(", requested by thread " PTR_FORMAT, calling_thread());
   }
 }
 void VM_ThreadStop::doit() {
   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
   JavaThread* target = java_lang_Thread::thread(target_thread());
   // Note that this now allows multiple ThreadDeath exceptions to be
   // thrown at a thread.
   if (target != NULL) {
     // the thread has run and is not already in the process of exiting
     target->send_thread_stop(throwable());
   }
 }
 void VM_Deoptimize::doit() {
   // We do not want any GCs to happen while we are in the middle of this VM operation
   ResourceMark rm;
   DeoptimizationMarker dm;
   // Deoptimize all activations depending on marked nmethods
   Deoptimization::deoptimize_dependents();
   // Make the dependent methods zombies
   CodeCache::make_marked_nmethods_zombies();
 }
 VM_DeoptimizeFrame::VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id) {
   _thread = thread;
   _id     = id;
 }
 void VM_DeoptimizeFrame::doit() {
   Deoptimization::deoptimize_frame_internal(_thread, _id);
 }
 #ifndef PRODUCT
 void VM_DeoptimizeAll::doit() {
   DeoptimizationMarker dm;
   // deoptimize all java threads in the system
   if (DeoptimizeALot) {
     for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
       if (thread->has_last_Java_frame()) {
         thread->deoptimize();
       }
     }
   } else if (DeoptimizeRandom) {
     // Deoptimize some selected threads and frames
     int tnum = os::random() & 0x3;
     int fnum =  os::random() & 0x3;
     int tcount = 0;
     for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
       if (thread->has_last_Java_frame()) {
         if (tcount++ == tnum)  {
         tcount = 0;
           int fcount = 0;
           // Deoptimize some selected frames.
           // Biased llocking wants a updated register map
           for(StackFrameStream fst(thread, UseBiasedLocking); !fst.is_done(); fst.next()) {
             if (fst.current()->can_be_deoptimized()) {
               if (fcount++ == fnum) {
                 fcount = 0;
                 Deoptimization::deoptimize(thread, *fst.current(), fst.register_map());
               }
             }
           }
         }
       }
     }
   }
 }
 void VM_ZombieAll::doit() {
   JavaThread *thread = (JavaThread *)calling_thread();
   assert(thread->is_Java_thread(), "must be a Java thread");
   thread->make_zombies();
 }
 #endif // !PRODUCT
 void VM_UnlinkSymbols::doit() {
   JavaThread *thread = (JavaThread *)calling_thread();
   assert(thread->is_Java_thread(), "must be a Java thread");
   SymbolTable::unlink();
 }
 void VM_Verify::doit() {
   Universe::heap()->prepare_for_verify();
   Universe::verify(_silent);
 }
 bool VM_PrintThreads::doit_prologue() {
   assert(Thread::current()->is_Java_thread(), "just checking");
   // Make sure AbstractOwnableSynchronizer is loaded
   if (JDK_Version::is_gte_jdk16x_version()) {
     java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
   }
   // Get Heap_lock if concurrent locks will be dumped
   if (_print_concurrent_locks) {
     Heap_lock->lock();
   }
   return true;
 }
 void VM_PrintThreads::doit() {
   Threads::print_on(_out, true, false, _print_concurrent_locks);
 }
 void VM_PrintThreads::doit_epilogue() {
   if (_print_concurrent_locks) {
     // Release Heap_lock
     Heap_lock->unlock();
   }
 }
 void VM_PrintJNI::doit() {
   JNIHandles::print_on(_out);
 }
 VM_FindDeadlocks::~VM_FindDeadlocks() {
   if (_deadlocks != NULL) {
     DeadlockCycle* cycle = _deadlocks;
     while (cycle != NULL) {
       DeadlockCycle* d = cycle;
       cycle = cycle->next();
       delete d;
     }
   }
 }
 bool VM_FindDeadlocks::doit_prologue() {
   assert(Thread::current()->is_Java_thread(), "just checking");
   // Load AbstractOwnableSynchronizer class
   if (_concurrent_locks && JDK_Version::is_gte_jdk16x_version()) {
     java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
   }
   return true;
 }
 void VM_FindDeadlocks::doit() {
   _deadlocks = ThreadService::find_deadlocks_at_safepoint(_concurrent_locks);
   if (_out != NULL) {
     int num_deadlocks = 0;
     for (DeadlockCycle* cycle = _deadlocks; cycle != NULL; cycle = cycle->next()) {
       num_deadlocks++;
       cycle->print_on(_out);
     }
     if (num_deadlocks == 1) {
       _out->print_cr("\nFound 1 deadlock.\n");
       _out->flush();
     } else if (num_deadlocks > 1) {
       _out->print_cr("\nFound %d deadlocks.\n", num_deadlocks);
       _out->flush();
     }
   }
 }
 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result,
                              int max_depth,
                              bool with_locked_monitors,
                              bool with_locked_synchronizers) {
   _result = result;
   _num_threads = 0; // 0 indicates all threads
   _threads = NULL;
   _result = result;
   _max_depth = max_depth;
   _with_locked_monitors = with_locked_monitors;
   _with_locked_synchronizers = with_locked_synchronizers;
 }
 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result,
                              GrowableArray<instanceHandle>* threads,
                              int num_threads,
                              int max_depth,
                              bool with_locked_monitors,
                              bool with_locked_synchronizers) {
   _result = result;
   _num_threads = num_threads;
   _threads = threads;
   _result = result;
   _max_depth = max_depth;
   _with_locked_monitors = with_locked_monitors;
   _with_locked_synchronizers = with_locked_synchronizers;
 }
 bool VM_ThreadDump::doit_prologue() {
   assert(Thread::current()->is_Java_thread(), "just checking");
   // Load AbstractOwnableSynchronizer class before taking thread snapshots
   if (JDK_Version::is_gte_jdk16x_version()) {
     java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
   }
   if (_with_locked_synchronizers) {
     // Acquire Heap_lock to dump concurrent locks
     Heap_lock->lock();
   }
   return true;
 }
 void VM_ThreadDump::doit_epilogue() {
   if (_with_locked_synchronizers) {
     // Release Heap_lock
     Heap_lock->unlock();
   }
 }
 void VM_ThreadDump::doit() {
   ResourceMark rm;
   ConcurrentLocksDump concurrent_locks(true);
   if (_with_locked_synchronizers) {
     concurrent_locks.dump_at_safepoint();
   }
   if (_num_threads == 0) {
     // Snapshot all live threads
     for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) {
       if (jt->is_exiting() ||
           jt->is_hidden_from_external_view())  {
         // skip terminating threads and hidden threads
         continue;
       }
       ThreadConcurrentLocks* tcl = NULL;
       if (_with_locked_synchronizers) {
         tcl = concurrent_locks.thread_concurrent_locks(jt);
       }
       ThreadSnapshot* ts = snapshot_thread(jt, tcl);
       _result->add_thread_snapshot(ts);
     }
   } else {
     // Snapshot threads in the given _threads array
     // A dummy snapshot is created if a thread doesn't exist
     for (int i = 0; i < _num_threads; i++) {
       instanceHandle th = _threads->at(i);
       if (th() == NULL) {
         // skip if the thread doesn't exist
         // Add a dummy snapshot
         _result->add_thread_snapshot(new ThreadSnapshot());
         continue;
       }
       // Dump thread stack only if the thread is alive and not exiting
       // and not VM internal thread.
       JavaThread* jt = java_lang_Thread::thread(th());
       if (jt == NULL || /* thread not alive */
           jt->is_exiting() ||
           jt->is_hidden_from_external_view())  {
         // add a NULL snapshot if skipped
         _result->add_thread_snapshot(new ThreadSnapshot());
         continue;
       }
       ThreadConcurrentLocks* tcl = NULL;
       if (_with_locked_synchronizers) {
         tcl = concurrent_locks.thread_concurrent_locks(jt);
       }
       ThreadSnapshot* ts = snapshot_thread(jt, tcl);
       _result->add_thread_snapshot(ts);
     }
   }
 }
 ThreadSnapshot* VM_ThreadDump::snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl) {
   ThreadSnapshot* snapshot = new ThreadSnapshot(java_thread);
   snapshot->dump_stack_at_safepoint(_max_depth, _with_locked_monitors);
   snapshot->set_concurrent_locks(tcl);
   return snapshot;
 }
 volatile bool VM_Exit::_vm_exited = false;
 Thread * VM_Exit::_shutdown_thread = NULL;
 int VM_Exit::set_vm_exited() {
   Thread * thr_cur = ThreadLocalStorage::get_thread_slow();
   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already");
   int num_active = 0;
   _shutdown_thread = thr_cur;
   _vm_exited = true;                                // global flag
   for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next())
     if (thr!=thr_cur && thr->thread_state() == _thread_in_native) {
       ++num_active;
       thr->set_terminated(JavaThread::_vm_exited);  // per-thread flag
     }
   return num_active;
 }
 int VM_Exit::wait_for_threads_in_native_to_block() {
   // VM exits at safepoint. This function must be called at the final safepoint
   // to wait for threads in _thread_in_native state to be quiescent.
   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already");
   Thread * thr_cur = ThreadLocalStorage::get_thread_slow();
   Monitor timer(Mutex::leaf, "VM_Exit timer", true);
   // Compiler threads need longer wait because they can access VM data directly
   // while in native. If they are active and some structures being used are
   // deleted by the shutdown sequence, they will crash. On the other hand, user
   // threads must go through native=>Java/VM transitions first to access VM
   // data, and they will be stopped during state transition. In theory, we
   // don't have to wait for user threads to be quiescent, but it's always
   // better to terminate VM when current thread is the only active thread, so
   // wait for user threads too. Numbers are in 10 milliseconds.
   int max_wait_user_thread = 30;                  // at least 300 milliseconds
   int max_wait_compiler_thread = 1000;            // at least 10 seconds
   int max_wait = max_wait_compiler_thread;
   int attempts = 0;
   while (true) {
     int num_active = 0;
     int num_active_compiler_thread = 0;
     for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next()) {
       if (thr!=thr_cur && thr->thread_state() == _thread_in_native) {
         num_active++;
         if (thr->is_Compiler_thread()) {
           num_active_compiler_thread++;
         }
       }
     }
     if (num_active == 0) {
        return 0;
     } else if (attempts > max_wait) {
        return num_active;
     } else if (num_active_compiler_thread == 0 && attempts > max_wait_user_thread) {
        return num_active;
     }
     attempts++;
     MutexLockerEx ml(&timer, Mutex::_no_safepoint_check_flag);
     timer.wait(Mutex::_no_safepoint_check_flag, 10);
   }
 }
 void VM_Exit::doit() {
   CompileBroker::set_should_block();
   // Wait for a short period for threads in native to block. Any thread
   // still executing native code after the wait will be stopped at
   // native==>Java/VM barriers.
   // Among 16276 JCK tests, 94% of them come here without any threads still
   // running in native; the other 6% are quiescent within 250ms (Ultra 80).
   wait_for_threads_in_native_to_block();
   set_vm_exited();
   // cleanup globals resources before exiting. exit_globals() currently
   // cleans up outputStream resources and PerfMemory resources.
   exit_globals();
   // Check for exit hook
   exit_hook_t exit_hook = Arguments::exit_hook();
   if (exit_hook != NULL) {
     // exit hook should exit.
     exit_hook(_exit_code);
     // ... but if it didn't, we must do it here
     vm_direct_exit(_exit_code);
   } else {
     vm_direct_exit(_exit_code);
   }
 }
 void VM_Exit::wait_if_vm_exited() {
   if (_vm_exited &&
       ThreadLocalStorage::get_thread_slow() != _shutdown_thread) {
     // _vm_exited is set at safepoint, and the Threads_lock is never released
     // we will block here until the process dies
     Threads_lock->lock_without_safepoint_check();
     ShouldNotReachHere();
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/vm_operations.cpp@248ff38d2950 (annotated)

src/share/vm/runtime/vm_operations.cpp