truffle: src/share/vm/runtime/vm_operations.cpp comparison

comparison src/share/vm/runtime/vm_operations.cpp @ 0:a61af66fc99e jdk7-b24

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author	duke
date	Sat, 01 Dec 2007 00:00:00 +0000
parents
children	5f24d0319e54

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--1:000000000000
+:a61af66fc99e
+/*
+* Copyright 1997-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+* CA 95054 USA or visit www.sun.com if you need additional information or
+* have any questions.
+*
+*/
+# include "incls/_precompiled.incl"
+# include "incls/_vm_operations.cpp.incl"
+#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("]");
+}
+}
+// 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;
+switch(evaluation_mode()) {
+case _safepoint      : mode = "safepoint";       break;
+case _no_safepoint   : mode = "no safepoint";    break;
+case _concurrent     : mode = "concurrent";      break;
+case _async_safepoint: mode = "async safepoint"; break;
+default              : mode = "unknown";         break;
+}
+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(_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_Verify::doit() {
+Universe::verify();
+}
+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();
+}
+}

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comparison src/share/vm/runtime/vm_operations.cpp @ 0:a61af66fc99e jdk7-b24