mirror of
https://github.com/openjdk/jdk.git
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4062 lines
140 KiB
C++
4062 lines
140 KiB
C++
/*
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* Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2021, Azul Systems, Inc. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "jvm.h"
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#include "cds/dynamicArchive.hpp"
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#include "cds/metaspaceShared.hpp"
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#include "classfile/classLoader.hpp"
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#include "classfile/javaClasses.hpp"
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#include "classfile/javaThreadStatus.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "classfile/vmClasses.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "code/codeCache.hpp"
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#include "code/scopeDesc.hpp"
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#include "compiler/compileBroker.hpp"
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#include "compiler/compileTask.hpp"
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#include "compiler/compilerThread.hpp"
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#include "gc/shared/barrierSet.hpp"
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#include "gc/shared/barrierSetNMethod.hpp"
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#include "gc/shared/collectedHeap.hpp"
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#include "gc/shared/gcId.hpp"
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#include "gc/shared/gcLocker.inline.hpp"
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#include "gc/shared/gcVMOperations.hpp"
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#include "gc/shared/oopStorage.hpp"
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#include "gc/shared/oopStorageSet.hpp"
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#include "gc/shared/stringdedup/stringDedup.hpp"
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#include "gc/shared/tlab_globals.hpp"
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#include "interpreter/interpreter.hpp"
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#include "interpreter/linkResolver.hpp"
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#include "interpreter/oopMapCache.hpp"
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#include "jfr/jfrEvents.hpp"
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#include "jvmtifiles/jvmtiEnv.hpp"
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#include "logging/log.hpp"
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#include "logging/logAsyncWriter.hpp"
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#include "logging/logConfiguration.hpp"
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#include "logging/logStream.hpp"
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#include "memory/allocation.inline.hpp"
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#include "memory/iterator.hpp"
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#include "memory/oopFactory.hpp"
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#include "memory/resourceArea.hpp"
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#include "memory/universe.hpp"
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#include "oops/access.inline.hpp"
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#include "oops/instanceKlass.hpp"
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#include "oops/klass.inline.hpp"
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#include "oops/objArrayOop.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/oopHandle.inline.hpp"
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#include "oops/symbol.hpp"
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#include "oops/typeArrayOop.inline.hpp"
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#include "oops/verifyOopClosure.hpp"
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#include "prims/jvm_misc.hpp"
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#include "prims/jvmtiDeferredUpdates.hpp"
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#include "prims/jvmtiExport.hpp"
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#include "prims/jvmtiThreadState.inline.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/continuation.hpp"
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#include "runtime/continuationEntry.inline.hpp"
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#include "runtime/continuationHelper.inline.hpp"
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#include "runtime/fieldDescriptor.inline.hpp"
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#include "runtime/flags/jvmFlagLimit.hpp"
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#include "runtime/deoptimization.hpp"
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#include "runtime/frame.inline.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/handshake.hpp"
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#include "runtime/init.hpp"
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#include "runtime/interfaceSupport.inline.hpp"
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#include "runtime/java.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/jniHandles.inline.hpp"
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#include "runtime/jniPeriodicChecker.hpp"
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#include "runtime/monitorDeflationThread.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/nonJavaThread.hpp"
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#include "runtime/objectMonitor.hpp"
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#include "runtime/orderAccess.hpp"
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#include "runtime/osThread.hpp"
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#include "runtime/safepoint.hpp"
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#include "runtime/safepointMechanism.inline.hpp"
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#include "runtime/safepointVerifiers.hpp"
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#include "runtime/serviceThread.hpp"
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#include "runtime/sharedRuntime.hpp"
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#include "runtime/stackFrameStream.inline.hpp"
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#include "runtime/stackWatermarkSet.hpp"
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#include "runtime/statSampler.hpp"
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#include "runtime/task.hpp"
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#include "runtime/thread.inline.hpp"
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#include "runtime/threadCritical.hpp"
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#include "runtime/threadSMR.inline.hpp"
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#include "runtime/threadStatisticalInfo.hpp"
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#include "runtime/threadWXSetters.inline.hpp"
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#include "runtime/timer.hpp"
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#include "runtime/timerTrace.hpp"
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#include "runtime/vframe.inline.hpp"
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#include "runtime/vframeArray.hpp"
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#include "runtime/vframe_hp.hpp"
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#include "runtime/vmThread.hpp"
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#include "runtime/vmOperations.hpp"
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#include "runtime/vm_version.hpp"
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#include "services/attachListener.hpp"
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#include "services/management.hpp"
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#include "services/memTracker.hpp"
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#include "services/threadService.hpp"
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#include "utilities/align.hpp"
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#include "utilities/copy.hpp"
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#include "utilities/defaultStream.hpp"
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#include "utilities/dtrace.hpp"
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#include "utilities/events.hpp"
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#include "utilities/macros.hpp"
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#include "utilities/preserveException.hpp"
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#include "utilities/spinYield.hpp"
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#include "utilities/vmError.hpp"
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#if INCLUDE_JVMCI
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#include "jvmci/jvmci.hpp"
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#include "jvmci/jvmciEnv.hpp"
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#endif
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#ifdef COMPILER1
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#include "c1/c1_Compiler.hpp"
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#endif
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#ifdef COMPILER2
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#include "opto/c2compiler.hpp"
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#include "opto/idealGraphPrinter.hpp"
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#endif
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#if INCLUDE_RTM_OPT
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#include "runtime/rtmLocking.hpp"
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#endif
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#if INCLUDE_JFR
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#include "jfr/jfr.hpp"
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#endif
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// Initialization after module runtime initialization
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void universe_post_module_init(); // must happen after call_initPhase2
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#ifdef DTRACE_ENABLED
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// Only bother with this argument setup if dtrace is available
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#define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_START
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#define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_STOP
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#define DTRACE_THREAD_PROBE(probe, javathread) \
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{ \
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ResourceMark rm(this); \
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int len = 0; \
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const char* name = (javathread)->name(); \
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len = strlen(name); \
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HOTSPOT_THREAD_PROBE_##probe(/* probe = start, stop */ \
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(char *) name, len, \
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java_lang_Thread::thread_id((javathread)->threadObj()), \
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(uintptr_t) (javathread)->osthread()->thread_id(), \
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java_lang_Thread::is_daemon((javathread)->threadObj())); \
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}
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#else // ndef DTRACE_ENABLED
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#define DTRACE_THREAD_PROBE(probe, javathread)
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#endif // ndef DTRACE_ENABLED
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#ifndef USE_LIBRARY_BASED_TLS_ONLY
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// Current thread is maintained as a thread-local variable
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THREAD_LOCAL Thread* Thread::_thr_current = NULL;
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#endif
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// ======= Thread ========
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void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) {
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return throw_excpt ? AllocateHeap(size, flags, CURRENT_PC)
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: AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL);
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}
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void Thread::operator delete(void* p) {
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FreeHeap(p);
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}
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void JavaThread::smr_delete() {
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if (_on_thread_list) {
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ThreadsSMRSupport::smr_delete(this);
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} else {
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delete this;
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}
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}
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// Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread,
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// JavaThread
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DEBUG_ONLY(Thread* Thread::_starting_thread = NULL;)
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Thread::Thread() {
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DEBUG_ONLY(_run_state = PRE_CALL_RUN;)
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// stack and get_thread
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set_stack_base(NULL);
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set_stack_size(0);
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set_lgrp_id(-1);
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DEBUG_ONLY(clear_suspendible_thread();)
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// allocated data structures
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set_osthread(NULL);
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set_resource_area(new (mtThread)ResourceArea());
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DEBUG_ONLY(_current_resource_mark = NULL;)
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set_handle_area(new (mtThread) HandleArea(NULL));
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set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(30, mtClass));
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set_last_handle_mark(NULL);
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DEBUG_ONLY(_missed_ic_stub_refill_verifier = NULL);
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// Initial value of zero ==> never claimed.
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_threads_do_token = 0;
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_threads_hazard_ptr = NULL;
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_threads_list_ptr = NULL;
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_nested_threads_hazard_ptr_cnt = 0;
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_rcu_counter = 0;
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// the handle mark links itself to last_handle_mark
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new HandleMark(this);
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// plain initialization
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debug_only(_owned_locks = NULL;)
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NOT_PRODUCT(_skip_gcalot = false;)
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_jvmti_env_iteration_count = 0;
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set_allocated_bytes(0);
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_current_pending_raw_monitor = NULL;
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// thread-specific hashCode stream generator state - Marsaglia shift-xor form
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_hashStateX = os::random();
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_hashStateY = 842502087;
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_hashStateZ = 0x8767; // (int)(3579807591LL & 0xffff) ;
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_hashStateW = 273326509;
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// Many of the following fields are effectively final - immutable
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// Note that nascent threads can't use the Native Monitor-Mutex
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// construct until the _MutexEvent is initialized ...
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// CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents
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// we might instead use a stack of ParkEvents that we could provision on-demand.
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// The stack would act as a cache to avoid calls to ParkEvent::Allocate()
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// and ::Release()
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_ParkEvent = ParkEvent::Allocate(this);
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#ifdef CHECK_UNHANDLED_OOPS
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if (CheckUnhandledOops) {
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_unhandled_oops = new UnhandledOops(this);
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}
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#endif // CHECK_UNHANDLED_OOPS
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// Notify the barrier set that a thread is being created. The initial
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// thread is created before the barrier set is available. The call to
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// BarrierSet::on_thread_create() for this thread is therefore deferred
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// to BarrierSet::set_barrier_set().
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BarrierSet* const barrier_set = BarrierSet::barrier_set();
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if (barrier_set != NULL) {
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barrier_set->on_thread_create(this);
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} else {
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// Only the main thread should be created before the barrier set
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// and that happens just before Thread::current is set. No other thread
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// can attach as the VM is not created yet, so they can't execute this code.
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// If the main thread creates other threads before the barrier set that is an error.
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assert(Thread::current_or_null() == NULL, "creating thread before barrier set");
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}
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MACOS_AARCH64_ONLY(DEBUG_ONLY(_wx_init = false));
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}
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void Thread::initialize_tlab() {
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if (UseTLAB) {
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tlab().initialize();
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}
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}
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void Thread::initialize_thread_current() {
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#ifndef USE_LIBRARY_BASED_TLS_ONLY
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assert(_thr_current == NULL, "Thread::current already initialized");
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_thr_current = this;
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#endif
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assert(ThreadLocalStorage::thread() == NULL, "ThreadLocalStorage::thread already initialized");
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ThreadLocalStorage::set_thread(this);
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assert(Thread::current() == ThreadLocalStorage::thread(), "TLS mismatch!");
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}
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void Thread::clear_thread_current() {
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assert(Thread::current() == ThreadLocalStorage::thread(), "TLS mismatch!");
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#ifndef USE_LIBRARY_BASED_TLS_ONLY
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_thr_current = NULL;
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#endif
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ThreadLocalStorage::set_thread(NULL);
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}
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void Thread::record_stack_base_and_size() {
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// Note: at this point, Thread object is not yet initialized. Do not rely on
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// any members being initialized. Do not rely on Thread::current() being set.
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// If possible, refrain from doing anything which may crash or assert since
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// quite probably those crash dumps will be useless.
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set_stack_base(os::current_stack_base());
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set_stack_size(os::current_stack_size());
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// Set stack limits after thread is initialized.
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if (is_Java_thread()) {
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JavaThread::cast(this)->stack_overflow_state()->initialize(stack_base(), stack_end());
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}
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}
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void Thread::register_thread_stack_with_NMT() {
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MemTracker::record_thread_stack(stack_end(), stack_size());
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}
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void Thread::unregister_thread_stack_with_NMT() {
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MemTracker::release_thread_stack(stack_end(), stack_size());
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}
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void Thread::call_run() {
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DEBUG_ONLY(_run_state = CALL_RUN;)
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// At this point, Thread object should be fully initialized and
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// Thread::current() should be set.
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assert(Thread::current_or_null() != NULL, "current thread is unset");
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assert(Thread::current_or_null() == this, "current thread is wrong");
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// Perform common initialization actions
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MACOS_AARCH64_ONLY(this->init_wx());
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register_thread_stack_with_NMT();
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JFR_ONLY(Jfr::on_thread_start(this);)
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log_debug(os, thread)("Thread " UINTX_FORMAT " stack dimensions: "
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PTR_FORMAT "-" PTR_FORMAT " (" SIZE_FORMAT "k).",
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os::current_thread_id(), p2i(stack_end()),
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p2i(stack_base()), stack_size()/1024);
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// Perform <ChildClass> initialization actions
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DEBUG_ONLY(_run_state = PRE_RUN;)
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this->pre_run();
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// Invoke <ChildClass>::run()
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DEBUG_ONLY(_run_state = RUN;)
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this->run();
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// Returned from <ChildClass>::run(). Thread finished.
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// Perform common tear-down actions
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assert(Thread::current_or_null() != NULL, "current thread is unset");
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assert(Thread::current_or_null() == this, "current thread is wrong");
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// Perform <ChildClass> tear-down actions
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DEBUG_ONLY(_run_state = POST_RUN;)
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this->post_run();
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// Note: at this point the thread object may already have deleted itself,
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// so from here on do not dereference *this*. Not all thread types currently
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// delete themselves when they terminate. But no thread should ever be deleted
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// asynchronously with respect to its termination - that is what _run_state can
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// be used to check.
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assert(Thread::current_or_null() == NULL, "current thread still present");
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}
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Thread::~Thread() {
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// Attached threads will remain in PRE_CALL_RUN, as will threads that don't actually
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// get started due to errors etc. Any active thread should at least reach post_run
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// before it is deleted (usually in post_run()).
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assert(_run_state == PRE_CALL_RUN ||
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_run_state == POST_RUN, "Active Thread deleted before post_run(): "
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"_run_state=%d", (int)_run_state);
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// Notify the barrier set that a thread is being destroyed. Note that a barrier
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// set might not be available if we encountered errors during bootstrapping.
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BarrierSet* const barrier_set = BarrierSet::barrier_set();
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if (barrier_set != NULL) {
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barrier_set->on_thread_destroy(this);
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}
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// deallocate data structures
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delete resource_area();
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// since the handle marks are using the handle area, we have to deallocated the root
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// handle mark before deallocating the thread's handle area,
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assert(last_handle_mark() != NULL, "check we have an element");
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delete last_handle_mark();
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assert(last_handle_mark() == NULL, "check we have reached the end");
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ParkEvent::Release(_ParkEvent);
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// Set to NULL as a termination indicator for has_terminated().
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Atomic::store(&_ParkEvent, (ParkEvent*)NULL);
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delete handle_area();
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delete metadata_handles();
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// osthread() can be NULL, if creation of thread failed.
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if (osthread() != NULL) os::free_thread(osthread());
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// Clear Thread::current if thread is deleting itself and it has not
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// already been done. This must be done before the memory is deallocated.
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// Needed to ensure JNI correctly detects non-attached threads.
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if (this == Thread::current_or_null()) {
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Thread::clear_thread_current();
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}
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CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();)
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}
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#ifdef ASSERT
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// A JavaThread is considered dangling if it not handshake-safe with respect to
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// the current thread, it is not on a ThreadsList, or not at safepoint.
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void Thread::check_for_dangling_thread_pointer(Thread *thread) {
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assert(!thread->is_Java_thread() ||
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JavaThread::cast(thread)->is_handshake_safe_for(Thread::current()) ||
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!JavaThread::cast(thread)->on_thread_list() ||
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SafepointSynchronize::is_at_safepoint() ||
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ThreadsSMRSupport::is_a_protected_JavaThread_with_lock(JavaThread::cast(thread)),
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"possibility of dangling Thread pointer");
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}
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#endif
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// Is the target JavaThread protected by the calling Thread or by some other
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// mechanism?
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//
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bool Thread::is_JavaThread_protected(const JavaThread* target) {
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Thread* current_thread = Thread::current();
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// Do the simplest check first:
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if (SafepointSynchronize::is_at_safepoint()) {
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// The target is protected since JavaThreads cannot exit
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// while we're at a safepoint.
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return true;
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}
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// If the target hasn't been started yet then it is trivially
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// "protected". We assume the caller is the thread that will do
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// the starting.
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if (target->osthread() == NULL || target->osthread()->get_state() <= INITIALIZED) {
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return true;
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}
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// Now make the simple checks based on who the caller is:
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if (current_thread == target || Threads_lock->owner() == current_thread) {
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// Target JavaThread is self or calling thread owns the Threads_lock.
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|
// Second check is the same as Threads_lock->owner_is_self(),
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// but we already have the current thread so check directly.
|
|
return true;
|
|
}
|
|
|
|
// Check the ThreadsLists associated with the calling thread (if any)
|
|
// to see if one of them protects the target JavaThread:
|
|
if (is_JavaThread_protected_by_TLH(target)) {
|
|
return true;
|
|
}
|
|
|
|
// Use this debug code with -XX:+UseNewCode to diagnose locations that
|
|
// are missing a ThreadsListHandle or other protection mechanism:
|
|
// guarantee(!UseNewCode, "current_thread=" INTPTR_FORMAT " is not protecting target="
|
|
// INTPTR_FORMAT, p2i(current_thread), p2i(target));
|
|
|
|
// Note: Since 'target' isn't protected by a TLH, the call to
|
|
// target->is_handshake_safe_for() may crash, but we have debug bits so
|
|
// we'll be able to figure out what protection mechanism is missing.
|
|
assert(target->is_handshake_safe_for(current_thread), "JavaThread=" INTPTR_FORMAT
|
|
" is not protected and not handshake safe.", p2i(target));
|
|
|
|
// The target JavaThread is not protected so it is not safe to query:
|
|
return false;
|
|
}
|
|
|
|
// Is the target JavaThread protected by a ThreadsListHandle (TLH) associated
|
|
// with the calling Thread?
|
|
//
|
|
bool Thread::is_JavaThread_protected_by_TLH(const JavaThread* target) {
|
|
Thread* current_thread = Thread::current();
|
|
|
|
// Check the ThreadsLists associated with the calling thread (if any)
|
|
// to see if one of them protects the target JavaThread:
|
|
for (SafeThreadsListPtr* stlp = current_thread->_threads_list_ptr;
|
|
stlp != NULL; stlp = stlp->previous()) {
|
|
if (stlp->list()->includes(target)) {
|
|
// The target JavaThread is protected by this ThreadsList:
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// The target JavaThread is not protected by a TLH so it is not safe to query:
|
|
return false;
|
|
}
|
|
|
|
ThreadPriority Thread::get_priority(const Thread* const thread) {
|
|
ThreadPriority priority;
|
|
// Can return an error!
|
|
(void)os::get_priority(thread, priority);
|
|
assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found");
|
|
return priority;
|
|
}
|
|
|
|
void Thread::set_priority(Thread* thread, ThreadPriority priority) {
|
|
debug_only(check_for_dangling_thread_pointer(thread);)
|
|
// Can return an error!
|
|
(void)os::set_priority(thread, priority);
|
|
}
|
|
|
|
|
|
void Thread::start(Thread* thread) {
|
|
// Start is different from resume in that its safety is guaranteed by context or
|
|
// being called from a Java method synchronized on the Thread object.
|
|
if (thread->is_Java_thread()) {
|
|
// Initialize the thread state to RUNNABLE before starting this thread.
|
|
// Can not set it after the thread started because we do not know the
|
|
// exact thread state at that time. It could be in MONITOR_WAIT or
|
|
// in SLEEPING or some other state.
|
|
java_lang_Thread::set_thread_status(JavaThread::cast(thread)->threadObj(),
|
|
JavaThreadStatus::RUNNABLE);
|
|
}
|
|
os::start_thread(thread);
|
|
}
|
|
|
|
// GC Support
|
|
bool Thread::claim_par_threads_do(uintx claim_token) {
|
|
uintx token = _threads_do_token;
|
|
if (token != claim_token) {
|
|
uintx res = Atomic::cmpxchg(&_threads_do_token, token, claim_token);
|
|
if (res == token) {
|
|
return true;
|
|
}
|
|
guarantee(res == claim_token, "invariant");
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void Thread::oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf) {
|
|
// Do oop for ThreadShadow
|
|
f->do_oop((oop*)&_pending_exception);
|
|
handle_area()->oops_do(f);
|
|
}
|
|
|
|
// If the caller is a NamedThread, then remember, in the current scope,
|
|
// the given JavaThread in its _processed_thread field.
|
|
class RememberProcessedThread: public StackObj {
|
|
NamedThread* _cur_thr;
|
|
public:
|
|
RememberProcessedThread(Thread* thread) {
|
|
Thread* self = Thread::current();
|
|
if (self->is_Named_thread()) {
|
|
_cur_thr = (NamedThread *)self;
|
|
assert(_cur_thr->processed_thread() == NULL, "nesting not supported");
|
|
_cur_thr->set_processed_thread(thread);
|
|
} else {
|
|
_cur_thr = NULL;
|
|
}
|
|
}
|
|
|
|
~RememberProcessedThread() {
|
|
if (_cur_thr) {
|
|
assert(_cur_thr->processed_thread() != NULL, "nesting not supported");
|
|
_cur_thr->set_processed_thread(NULL);
|
|
}
|
|
}
|
|
};
|
|
|
|
void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) {
|
|
// Record JavaThread to GC thread
|
|
RememberProcessedThread rpt(this);
|
|
oops_do_no_frames(f, cf);
|
|
oops_do_frames(f, cf);
|
|
}
|
|
|
|
void Thread::metadata_handles_do(void f(Metadata*)) {
|
|
// Only walk the Handles in Thread.
|
|
if (metadata_handles() != NULL) {
|
|
for (int i = 0; i< metadata_handles()->length(); i++) {
|
|
f(metadata_handles()->at(i));
|
|
}
|
|
}
|
|
}
|
|
|
|
void Thread::print_on(outputStream* st, bool print_extended_info) const {
|
|
// get_priority assumes osthread initialized
|
|
if (osthread() != NULL) {
|
|
int os_prio;
|
|
if (os::get_native_priority(this, &os_prio) == OS_OK) {
|
|
st->print("os_prio=%d ", os_prio);
|
|
}
|
|
|
|
st->print("cpu=%.2fms ",
|
|
os::thread_cpu_time(const_cast<Thread*>(this), true) / 1000000.0
|
|
);
|
|
st->print("elapsed=%.2fs ",
|
|
_statistical_info.getElapsedTime() / 1000.0
|
|
);
|
|
if (is_Java_thread() && (PrintExtendedThreadInfo || print_extended_info)) {
|
|
size_t allocated_bytes = (size_t) const_cast<Thread*>(this)->cooked_allocated_bytes();
|
|
st->print("allocated=" SIZE_FORMAT "%s ",
|
|
byte_size_in_proper_unit(allocated_bytes),
|
|
proper_unit_for_byte_size(allocated_bytes)
|
|
);
|
|
st->print("defined_classes=" INT64_FORMAT " ", _statistical_info.getDefineClassCount());
|
|
}
|
|
|
|
st->print("tid=" INTPTR_FORMAT " ", p2i(this));
|
|
if (!is_Java_thread() || !JavaThread::cast(this)->is_vthread_mounted()) {
|
|
osthread()->print_on(st);
|
|
}
|
|
}
|
|
ThreadsSMRSupport::print_info_on(this, st);
|
|
st->print(" ");
|
|
debug_only(if (WizardMode) print_owned_locks_on(st);)
|
|
}
|
|
|
|
void Thread::print() const { print_on(tty); }
|
|
|
|
// Thread::print_on_error() is called by fatal error handler. Don't use
|
|
// any lock or allocate memory.
|
|
void Thread::print_on_error(outputStream* st, char* buf, int buflen) const {
|
|
assert(!(is_Compiler_thread() || is_Java_thread()), "Can't call name() here if it allocates");
|
|
|
|
st->print("%s \"%s\"", type_name(), name());
|
|
|
|
OSThread* os_thr = osthread();
|
|
if (os_thr != NULL) {
|
|
if (os_thr->get_state() != ZOMBIE) {
|
|
st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]",
|
|
p2i(stack_end()), p2i(stack_base()));
|
|
st->print(" [id=%d]", osthread()->thread_id());
|
|
} else {
|
|
st->print(" terminated");
|
|
}
|
|
} else {
|
|
st->print(" unknown state (no osThread)");
|
|
}
|
|
ThreadsSMRSupport::print_info_on(this, st);
|
|
}
|
|
|
|
void Thread::print_value_on(outputStream* st) const {
|
|
if (is_Named_thread()) {
|
|
st->print(" \"%s\" ", name());
|
|
}
|
|
st->print(INTPTR_FORMAT, p2i(this)); // print address
|
|
}
|
|
|
|
#ifdef ASSERT
|
|
void Thread::print_owned_locks_on(outputStream* st) const {
|
|
Mutex* cur = _owned_locks;
|
|
if (cur == NULL) {
|
|
st->print(" (no locks) ");
|
|
} else {
|
|
st->print_cr(" Locks owned:");
|
|
while (cur) {
|
|
cur->print_on(st);
|
|
cur = cur->next();
|
|
}
|
|
}
|
|
}
|
|
#endif // ASSERT
|
|
|
|
// We had to move these methods here, because vm threads get into ObjectSynchronizer::enter
|
|
// However, there is a note in JavaThread::is_lock_owned() about the VM threads not being
|
|
// used for compilation in the future. If that change is made, the need for these methods
|
|
// should be revisited, and they should be removed if possible.
|
|
|
|
bool Thread::is_lock_owned(address adr) const {
|
|
return is_in_full_stack(adr);
|
|
}
|
|
|
|
bool Thread::set_as_starting_thread() {
|
|
assert(_starting_thread == NULL, "already initialized: "
|
|
"_starting_thread=" INTPTR_FORMAT, p2i(_starting_thread));
|
|
// NOTE: this must be called inside the main thread.
|
|
DEBUG_ONLY(_starting_thread = this;)
|
|
return os::create_main_thread(JavaThread::cast(this));
|
|
}
|
|
|
|
static void initialize_class(Symbol* class_name, TRAPS) {
|
|
Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK);
|
|
InstanceKlass::cast(klass)->initialize(CHECK);
|
|
}
|
|
|
|
|
|
// Creates the initial ThreadGroup
|
|
static Handle create_initial_thread_group(TRAPS) {
|
|
Handle system_instance = JavaCalls::construct_new_instance(
|
|
vmClasses::ThreadGroup_klass(),
|
|
vmSymbols::void_method_signature(),
|
|
CHECK_NH);
|
|
Universe::set_system_thread_group(system_instance());
|
|
|
|
Handle string = java_lang_String::create_from_str("main", CHECK_NH);
|
|
Handle main_instance = JavaCalls::construct_new_instance(
|
|
vmClasses::ThreadGroup_klass(),
|
|
vmSymbols::threadgroup_string_void_signature(),
|
|
system_instance,
|
|
string,
|
|
CHECK_NH);
|
|
return main_instance;
|
|
}
|
|
|
|
// Creates the initial Thread, and sets it to running.
|
|
static void create_initial_thread(Handle thread_group, JavaThread* thread,
|
|
TRAPS) {
|
|
InstanceKlass* ik = vmClasses::Thread_klass();
|
|
assert(ik->is_initialized(), "must be");
|
|
instanceHandle thread_oop = ik->allocate_instance_handle(CHECK);
|
|
|
|
// Cannot use JavaCalls::construct_new_instance because the java.lang.Thread
|
|
// constructor calls Thread.current(), which must be set here for the
|
|
// initial thread.
|
|
java_lang_Thread::set_thread(thread_oop(), thread);
|
|
thread->set_threadOopHandles(thread_oop());
|
|
|
|
Handle string = java_lang_String::create_from_str("main", CHECK);
|
|
|
|
JavaValue result(T_VOID);
|
|
JavaCalls::call_special(&result, thread_oop,
|
|
ik,
|
|
vmSymbols::object_initializer_name(),
|
|
vmSymbols::threadgroup_string_void_signature(),
|
|
thread_group,
|
|
string,
|
|
CHECK);
|
|
|
|
// Set thread status to running since main thread has
|
|
// been started and running.
|
|
java_lang_Thread::set_thread_status(thread_oop(),
|
|
JavaThreadStatus::RUNNABLE);
|
|
}
|
|
|
|
// Extract version and vendor specific information from
|
|
// java.lang.VersionProps fields.
|
|
// Returned char* is allocated in the thread's resource area
|
|
// so must be copied for permanency.
|
|
static const char* get_java_version_info(InstanceKlass* ik,
|
|
Symbol* field_name) {
|
|
fieldDescriptor fd;
|
|
bool found = ik != NULL &&
|
|
ik->find_local_field(field_name,
|
|
vmSymbols::string_signature(), &fd);
|
|
if (found) {
|
|
oop name_oop = ik->java_mirror()->obj_field(fd.offset());
|
|
if (name_oop == NULL) {
|
|
return NULL;
|
|
}
|
|
const char* name = java_lang_String::as_utf8_string(name_oop);
|
|
return name;
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
// General purpose hook into Java code, run once when the VM is initialized.
|
|
// The Java library method itself may be changed independently from the VM.
|
|
static void call_postVMInitHook(TRAPS) {
|
|
Klass* klass = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_vm_PostVMInitHook(), THREAD);
|
|
if (klass != NULL) {
|
|
JavaValue result(T_VOID);
|
|
JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(),
|
|
vmSymbols::void_method_signature(),
|
|
CHECK);
|
|
}
|
|
}
|
|
|
|
// Initialized by VMThread at vm_global_init
|
|
static OopStorage* _thread_oop_storage = NULL;
|
|
|
|
OopStorage* JavaThread::thread_oop_storage() {
|
|
assert(_thread_oop_storage != NULL, "not yet initialized");
|
|
return _thread_oop_storage;
|
|
}
|
|
|
|
void JavaThread::set_threadOopHandles(oop p) {
|
|
assert(_thread_oop_storage != NULL, "not yet initialized");
|
|
_threadObj = OopHandle(_thread_oop_storage, p);
|
|
_vthread = OopHandle(_thread_oop_storage, p);
|
|
_jvmti_vthread = OopHandle(_thread_oop_storage, NULL);
|
|
_extentLocalCache = OopHandle(_thread_oop_storage, NULL);
|
|
}
|
|
|
|
oop JavaThread::threadObj() const {
|
|
return _threadObj.resolve();
|
|
}
|
|
|
|
oop JavaThread::vthread() const {
|
|
return _vthread.resolve();
|
|
}
|
|
|
|
void JavaThread::set_vthread(oop p) {
|
|
assert(_thread_oop_storage != NULL, "not yet initialized");
|
|
_vthread.replace(p);
|
|
}
|
|
|
|
oop JavaThread::jvmti_vthread() const {
|
|
return _jvmti_vthread.resolve();
|
|
}
|
|
|
|
void JavaThread::set_jvmti_vthread(oop p) {
|
|
assert(_thread_oop_storage != NULL, "not yet initialized");
|
|
_jvmti_vthread.replace(p);
|
|
}
|
|
|
|
oop JavaThread::extentLocalCache() const {
|
|
return _extentLocalCache.resolve();
|
|
}
|
|
|
|
void JavaThread::set_extentLocalCache(oop p) {
|
|
assert(_thread_oop_storage != NULL, "not yet initialized");
|
|
_extentLocalCache.replace(p);
|
|
}
|
|
|
|
void JavaThread::allocate_threadObj(Handle thread_group, const char* thread_name,
|
|
bool daemon, TRAPS) {
|
|
assert(thread_group.not_null(), "thread group should be specified");
|
|
assert(threadObj() == NULL, "should only create Java thread object once");
|
|
|
|
InstanceKlass* ik = vmClasses::Thread_klass();
|
|
assert(ik->is_initialized(), "must be");
|
|
instanceHandle thread_oop = ik->allocate_instance_handle(CHECK);
|
|
|
|
// We are called from jni_AttachCurrentThread/jni_AttachCurrentThreadAsDaemon.
|
|
// We cannot use JavaCalls::construct_new_instance because the java.lang.Thread
|
|
// constructor calls Thread.current(), which must be set here.
|
|
java_lang_Thread::set_thread(thread_oop(), this);
|
|
set_threadOopHandles(thread_oop());
|
|
|
|
JavaValue result(T_VOID);
|
|
if (thread_name != NULL) {
|
|
Handle name = java_lang_String::create_from_str(thread_name, CHECK);
|
|
// Thread gets assigned specified name and null target
|
|
JavaCalls::call_special(&result,
|
|
thread_oop,
|
|
ik,
|
|
vmSymbols::object_initializer_name(),
|
|
vmSymbols::threadgroup_string_void_signature(),
|
|
thread_group,
|
|
name,
|
|
THREAD);
|
|
} else {
|
|
// Thread gets assigned name "Thread-nnn" and null target
|
|
// (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument)
|
|
JavaCalls::call_special(&result,
|
|
thread_oop,
|
|
ik,
|
|
vmSymbols::object_initializer_name(),
|
|
vmSymbols::threadgroup_runnable_void_signature(),
|
|
thread_group,
|
|
Handle(),
|
|
THREAD);
|
|
}
|
|
os::set_priority(this, NormPriority);
|
|
|
|
if (daemon) {
|
|
java_lang_Thread::set_daemon(thread_oop());
|
|
}
|
|
}
|
|
|
|
// ======= JavaThread ========
|
|
|
|
#if INCLUDE_JVMCI
|
|
|
|
jlong* JavaThread::_jvmci_old_thread_counters;
|
|
|
|
bool jvmci_counters_include(JavaThread* thread) {
|
|
return !JVMCICountersExcludeCompiler || !thread->is_Compiler_thread();
|
|
}
|
|
|
|
void JavaThread::collect_counters(jlong* array, int length) {
|
|
assert(length == JVMCICounterSize, "wrong value");
|
|
for (int i = 0; i < length; i++) {
|
|
array[i] = _jvmci_old_thread_counters[i];
|
|
}
|
|
for (JavaThread* tp : ThreadsListHandle()) {
|
|
if (jvmci_counters_include(tp)) {
|
|
for (int i = 0; i < length; i++) {
|
|
array[i] += tp->_jvmci_counters[i];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Attempt to enlarge the array for per thread counters.
|
|
jlong* resize_counters_array(jlong* old_counters, int current_size, int new_size) {
|
|
jlong* new_counters = NEW_C_HEAP_ARRAY_RETURN_NULL(jlong, new_size, mtJVMCI);
|
|
if (new_counters == NULL) {
|
|
return NULL;
|
|
}
|
|
if (old_counters == NULL) {
|
|
old_counters = new_counters;
|
|
memset(old_counters, 0, sizeof(jlong) * new_size);
|
|
} else {
|
|
for (int i = 0; i < MIN2((int) current_size, new_size); i++) {
|
|
new_counters[i] = old_counters[i];
|
|
}
|
|
if (new_size > current_size) {
|
|
memset(new_counters + current_size, 0, sizeof(jlong) * (new_size - current_size));
|
|
}
|
|
FREE_C_HEAP_ARRAY(jlong, old_counters);
|
|
}
|
|
return new_counters;
|
|
}
|
|
|
|
// Attempt to enlarge the array for per thread counters.
|
|
bool JavaThread::resize_counters(int current_size, int new_size) {
|
|
jlong* new_counters = resize_counters_array(_jvmci_counters, current_size, new_size);
|
|
if (new_counters == NULL) {
|
|
return false;
|
|
} else {
|
|
_jvmci_counters = new_counters;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
class VM_JVMCIResizeCounters : public VM_Operation {
|
|
private:
|
|
int _new_size;
|
|
bool _failed;
|
|
|
|
public:
|
|
VM_JVMCIResizeCounters(int new_size) : _new_size(new_size), _failed(false) { }
|
|
VMOp_Type type() const { return VMOp_JVMCIResizeCounters; }
|
|
bool allow_nested_vm_operations() const { return true; }
|
|
void doit() {
|
|
// Resize the old thread counters array
|
|
jlong* new_counters = resize_counters_array(JavaThread::_jvmci_old_thread_counters, JVMCICounterSize, _new_size);
|
|
if (new_counters == NULL) {
|
|
_failed = true;
|
|
return;
|
|
} else {
|
|
JavaThread::_jvmci_old_thread_counters = new_counters;
|
|
}
|
|
|
|
// Now resize each threads array
|
|
for (JavaThread* tp : ThreadsListHandle()) {
|
|
if (!tp->resize_counters(JVMCICounterSize, _new_size)) {
|
|
_failed = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!_failed) {
|
|
JVMCICounterSize = _new_size;
|
|
}
|
|
}
|
|
|
|
bool failed() { return _failed; }
|
|
};
|
|
|
|
bool JavaThread::resize_all_jvmci_counters(int new_size) {
|
|
VM_JVMCIResizeCounters op(new_size);
|
|
VMThread::execute(&op);
|
|
return !op.failed();
|
|
}
|
|
|
|
#endif // INCLUDE_JVMCI
|
|
|
|
#ifdef ASSERT
|
|
// Checks safepoint allowed and clears unhandled oops at potential safepoints.
|
|
void JavaThread::check_possible_safepoint() {
|
|
if (_no_safepoint_count > 0) {
|
|
print_owned_locks();
|
|
assert(false, "Possible safepoint reached by thread that does not allow it");
|
|
}
|
|
#ifdef CHECK_UNHANDLED_OOPS
|
|
// Clear unhandled oops in JavaThreads so we get a crash right away.
|
|
clear_unhandled_oops();
|
|
#endif // CHECK_UNHANDLED_OOPS
|
|
|
|
// Macos/aarch64 should be in the right state for safepoint (e.g.
|
|
// deoptimization needs WXWrite). Crashes caused by the wrong state rarely
|
|
// happens in practice, making such issues hard to find and reproduce.
|
|
#if defined(__APPLE__) && defined(AARCH64)
|
|
if (AssertWXAtThreadSync) {
|
|
assert_wx_state(WXWrite);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void JavaThread::check_for_valid_safepoint_state() {
|
|
// Check NoSafepointVerifier, which is implied by locks taken that can be
|
|
// shared with the VM thread. This makes sure that no locks with allow_vm_block
|
|
// are held.
|
|
check_possible_safepoint();
|
|
|
|
if (thread_state() != _thread_in_vm) {
|
|
fatal("LEAF method calling lock?");
|
|
}
|
|
|
|
if (GCALotAtAllSafepoints) {
|
|
// We could enter a safepoint here and thus have a gc
|
|
InterfaceSupport::check_gc_alot();
|
|
}
|
|
}
|
|
#endif // ASSERT
|
|
|
|
// A JavaThread is a normal Java thread
|
|
|
|
JavaThread::JavaThread() :
|
|
// Initialize fields
|
|
|
|
_in_asgct(false),
|
|
_on_thread_list(false),
|
|
DEBUG_ONLY(_java_call_counter(0) COMMA)
|
|
_entry_point(nullptr),
|
|
_deopt_mark(nullptr),
|
|
_deopt_nmethod(nullptr),
|
|
_vframe_array_head(nullptr),
|
|
_vframe_array_last(nullptr),
|
|
_jvmti_deferred_updates(nullptr),
|
|
_callee_target(nullptr),
|
|
_vm_result(nullptr),
|
|
_vm_result_2(nullptr),
|
|
|
|
_current_pending_monitor(NULL),
|
|
_current_pending_monitor_is_from_java(true),
|
|
_current_waiting_monitor(NULL),
|
|
_active_handles(NULL),
|
|
_free_handle_block(NULL),
|
|
_Stalled(0),
|
|
|
|
_monitor_chunks(nullptr),
|
|
|
|
_suspend_flags(0),
|
|
|
|
_thread_state(_thread_new),
|
|
_saved_exception_pc(nullptr),
|
|
#ifdef ASSERT
|
|
_no_safepoint_count(0),
|
|
_visited_for_critical_count(false),
|
|
#endif
|
|
|
|
_terminated(_not_terminated),
|
|
_in_deopt_handler(0),
|
|
_doing_unsafe_access(false),
|
|
_do_not_unlock_if_synchronized(false),
|
|
#if INCLUDE_JVMTI
|
|
_carrier_thread_suspended(false),
|
|
_is_in_VTMS_transition(false),
|
|
#ifdef ASSERT
|
|
_is_VTMS_transition_disabler(false),
|
|
#endif
|
|
#endif
|
|
_jni_attach_state(_not_attaching_via_jni),
|
|
#if INCLUDE_JVMCI
|
|
_pending_deoptimization(-1),
|
|
_pending_monitorenter(false),
|
|
_pending_transfer_to_interpreter(false),
|
|
_in_retryable_allocation(false),
|
|
_pending_failed_speculation(0),
|
|
_jvmci{nullptr},
|
|
_libjvmci_runtime(nullptr),
|
|
_jvmci_counters(nullptr),
|
|
_jvmci_reserved0(0),
|
|
_jvmci_reserved1(0),
|
|
_jvmci_reserved_oop0(nullptr),
|
|
#endif // INCLUDE_JVMCI
|
|
|
|
_exception_oop(oop()),
|
|
_exception_pc(0),
|
|
_exception_handler_pc(0),
|
|
_is_method_handle_return(0),
|
|
|
|
_jni_active_critical(0),
|
|
_pending_jni_exception_check_fn(nullptr),
|
|
_depth_first_number(0),
|
|
|
|
// JVMTI PopFrame support
|
|
_popframe_condition(popframe_inactive),
|
|
_frames_to_pop_failed_realloc(0),
|
|
|
|
_cont_entry(nullptr),
|
|
_cont_fastpath(0),
|
|
_cont_fastpath_thread_state(1),
|
|
_held_monitor_count(0),
|
|
|
|
_handshake(this),
|
|
|
|
_popframe_preserved_args(nullptr),
|
|
_popframe_preserved_args_size(0),
|
|
|
|
_jvmti_thread_state(nullptr),
|
|
_interp_only_mode(0),
|
|
_should_post_on_exceptions_flag(JNI_FALSE),
|
|
_thread_stat(new ThreadStatistics()),
|
|
|
|
_parker(),
|
|
|
|
_class_to_be_initialized(nullptr),
|
|
|
|
_SleepEvent(ParkEvent::Allocate(this))
|
|
{
|
|
set_jni_functions(jni_functions());
|
|
|
|
#if INCLUDE_JVMCI
|
|
assert(_jvmci._implicit_exception_pc == nullptr, "must be");
|
|
if (JVMCICounterSize > 0) {
|
|
resize_counters(0, (int) JVMCICounterSize);
|
|
}
|
|
#endif // INCLUDE_JVMCI
|
|
|
|
// Setup safepoint state info for this thread
|
|
ThreadSafepointState::create(this);
|
|
|
|
SafepointMechanism::initialize_header(this);
|
|
|
|
set_requires_cross_modify_fence(false);
|
|
|
|
pd_initialize();
|
|
assert(deferred_card_mark().is_empty(), "Default MemRegion ctor");
|
|
}
|
|
|
|
JavaThread::JavaThread(bool is_attaching_via_jni) : JavaThread() {
|
|
if (is_attaching_via_jni) {
|
|
_jni_attach_state = _attaching_via_jni;
|
|
}
|
|
}
|
|
|
|
|
|
// interrupt support
|
|
|
|
void JavaThread::interrupt() {
|
|
// All callers should have 'this' thread protected by a
|
|
// ThreadsListHandle so that it cannot terminate and deallocate
|
|
// itself.
|
|
debug_only(check_for_dangling_thread_pointer(this);)
|
|
|
|
// For Windows _interrupt_event
|
|
WINDOWS_ONLY(osthread()->set_interrupted(true);)
|
|
|
|
// For Thread.sleep
|
|
_SleepEvent->unpark();
|
|
|
|
// For JSR166 LockSupport.park
|
|
parker()->unpark();
|
|
|
|
// For ObjectMonitor and JvmtiRawMonitor
|
|
_ParkEvent->unpark();
|
|
}
|
|
|
|
|
|
bool JavaThread::is_interrupted(bool clear_interrupted) {
|
|
debug_only(check_for_dangling_thread_pointer(this);)
|
|
|
|
if (_threadObj.peek() == NULL) {
|
|
// If there is no j.l.Thread then it is impossible to have
|
|
// been interrupted. We can find NULL during VM initialization
|
|
// or when a JNI thread is still in the process of attaching.
|
|
// In such cases this must be the current thread.
|
|
assert(this == Thread::current(), "invariant");
|
|
return false;
|
|
}
|
|
|
|
bool interrupted = java_lang_Thread::interrupted(threadObj());
|
|
|
|
// NOTE that since there is no "lock" around the interrupt and
|
|
// is_interrupted operations, there is the possibility that the
|
|
// interrupted flag will be "false" but that the
|
|
// low-level events will be in the signaled state. This is
|
|
// intentional. The effect of this is that Object.wait() and
|
|
// LockSupport.park() will appear to have a spurious wakeup, which
|
|
// is allowed and not harmful, and the possibility is so rare that
|
|
// it is not worth the added complexity to add yet another lock.
|
|
// For the sleep event an explicit reset is performed on entry
|
|
// to JavaThread::sleep, so there is no early return. It has also been
|
|
// recommended not to put the interrupted flag into the "event"
|
|
// structure because it hides the issue.
|
|
// Also, because there is no lock, we must only clear the interrupt
|
|
// state if we are going to report that we were interrupted; otherwise
|
|
// an interrupt that happens just after we read the field would be lost.
|
|
if (interrupted && clear_interrupted) {
|
|
assert(this == Thread::current(), "only the current thread can clear");
|
|
java_lang_Thread::set_interrupted(threadObj(), false);
|
|
WINDOWS_ONLY(osthread()->set_interrupted(false);)
|
|
}
|
|
|
|
return interrupted;
|
|
}
|
|
|
|
void JavaThread::block_if_vm_exited() {
|
|
if (_terminated == _vm_exited) {
|
|
// _vm_exited is set at safepoint, and Threads_lock is never released
|
|
// we will block here forever.
|
|
// Here we can be doing a jump from a safe state to an unsafe state without
|
|
// proper transition, but it happens after the final safepoint has begun.
|
|
set_thread_state(_thread_in_vm);
|
|
Threads_lock->lock();
|
|
ShouldNotReachHere();
|
|
}
|
|
}
|
|
|
|
JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : JavaThread() {
|
|
_jni_attach_state = _not_attaching_via_jni;
|
|
set_entry_point(entry_point);
|
|
// Create the native thread itself.
|
|
// %note runtime_23
|
|
os::ThreadType thr_type = os::java_thread;
|
|
thr_type = entry_point == &CompilerThread::thread_entry ? os::compiler_thread :
|
|
os::java_thread;
|
|
os::create_thread(this, thr_type, stack_sz);
|
|
// The _osthread may be NULL here because we ran out of memory (too many threads active).
|
|
// We need to throw and OutOfMemoryError - however we cannot do this here because the caller
|
|
// may hold a lock and all locks must be unlocked before throwing the exception (throwing
|
|
// the exception consists of creating the exception object & initializing it, initialization
|
|
// will leave the VM via a JavaCall and then all locks must be unlocked).
|
|
//
|
|
// The thread is still suspended when we reach here. Thread must be explicit started
|
|
// by creator! Furthermore, the thread must also explicitly be added to the Threads list
|
|
// by calling Threads:add. The reason why this is not done here, is because the thread
|
|
// object must be fully initialized (take a look at JVM_Start)
|
|
}
|
|
|
|
JavaThread::~JavaThread() {
|
|
|
|
// Ask ServiceThread to release the threadObj OopHandle
|
|
ServiceThread::add_oop_handle_release(_threadObj);
|
|
ServiceThread::add_oop_handle_release(_vthread);
|
|
ServiceThread::add_oop_handle_release(_jvmti_vthread);
|
|
|
|
// Return the sleep event to the free list
|
|
ParkEvent::Release(_SleepEvent);
|
|
_SleepEvent = NULL;
|
|
|
|
// Free any remaining previous UnrollBlock
|
|
vframeArray* old_array = vframe_array_last();
|
|
|
|
if (old_array != NULL) {
|
|
Deoptimization::UnrollBlock* old_info = old_array->unroll_block();
|
|
old_array->set_unroll_block(NULL);
|
|
delete old_info;
|
|
delete old_array;
|
|
}
|
|
|
|
JvmtiDeferredUpdates* updates = deferred_updates();
|
|
if (updates != NULL) {
|
|
// This can only happen if thread is destroyed before deoptimization occurs.
|
|
assert(updates->count() > 0, "Updates holder not deleted");
|
|
// free deferred updates.
|
|
delete updates;
|
|
set_deferred_updates(NULL);
|
|
}
|
|
|
|
// All Java related clean up happens in exit
|
|
ThreadSafepointState::destroy(this);
|
|
if (_thread_stat != NULL) delete _thread_stat;
|
|
|
|
#if INCLUDE_JVMCI
|
|
if (JVMCICounterSize > 0) {
|
|
FREE_C_HEAP_ARRAY(jlong, _jvmci_counters);
|
|
}
|
|
#endif // INCLUDE_JVMCI
|
|
}
|
|
|
|
|
|
// First JavaThread specific code executed by a new Java thread.
|
|
void JavaThread::pre_run() {
|
|
// empty - see comments in run()
|
|
}
|
|
|
|
// The main routine called by a new Java thread. This isn't overridden
|
|
// by subclasses, instead different subclasses define a different "entry_point"
|
|
// which defines the actual logic for that kind of thread.
|
|
void JavaThread::run() {
|
|
// initialize thread-local alloc buffer related fields
|
|
initialize_tlab();
|
|
|
|
_stack_overflow_state.create_stack_guard_pages();
|
|
|
|
cache_global_variables();
|
|
|
|
// Thread is now sufficiently initialized to be handled by the safepoint code as being
|
|
// in the VM. Change thread state from _thread_new to _thread_in_vm
|
|
assert(this->thread_state() == _thread_new, "wrong thread state");
|
|
set_thread_state(_thread_in_vm);
|
|
|
|
// Before a thread is on the threads list it is always safe, so after leaving the
|
|
// _thread_new we should emit a instruction barrier. The distance to modified code
|
|
// from here is probably far enough, but this is consistent and safe.
|
|
OrderAccess::cross_modify_fence();
|
|
|
|
assert(JavaThread::current() == this, "sanity check");
|
|
assert(!Thread::current()->owns_locks(), "sanity check");
|
|
|
|
DTRACE_THREAD_PROBE(start, this);
|
|
|
|
// This operation might block. We call that after all safepoint checks for a new thread has
|
|
// been completed.
|
|
set_active_handles(JNIHandleBlock::allocate_block());
|
|
|
|
if (JvmtiExport::should_post_thread_life()) {
|
|
JvmtiExport::post_thread_start(this);
|
|
|
|
}
|
|
|
|
// We call another function to do the rest so we are sure that the stack addresses used
|
|
// from there will be lower than the stack base just computed.
|
|
thread_main_inner();
|
|
}
|
|
|
|
void JavaThread::thread_main_inner() {
|
|
assert(JavaThread::current() == this, "sanity check");
|
|
assert(_threadObj.peek() != NULL, "just checking");
|
|
|
|
// Execute thread entry point unless this thread has a pending exception
|
|
// or has been stopped before starting.
|
|
// Note: Due to JVM_StopThread we can have pending exceptions already!
|
|
if (!this->has_pending_exception() &&
|
|
!java_lang_Thread::is_stillborn(this->threadObj())) {
|
|
{
|
|
ResourceMark rm(this);
|
|
this->set_native_thread_name(this->name());
|
|
}
|
|
HandleMark hm(this);
|
|
this->entry_point()(this, this);
|
|
}
|
|
|
|
DTRACE_THREAD_PROBE(stop, this);
|
|
|
|
// Cleanup is handled in post_run()
|
|
}
|
|
|
|
// Shared teardown for all JavaThreads
|
|
void JavaThread::post_run() {
|
|
this->exit(false);
|
|
this->unregister_thread_stack_with_NMT();
|
|
// Defer deletion to here to ensure 'this' is still referenceable in call_run
|
|
// for any shared tear-down.
|
|
this->smr_delete();
|
|
}
|
|
|
|
static void ensure_join(JavaThread* thread) {
|
|
// We do not need to grab the Threads_lock, since we are operating on ourself.
|
|
Handle threadObj(thread, thread->threadObj());
|
|
assert(threadObj.not_null(), "java thread object must exist");
|
|
ObjectLocker lock(threadObj, thread);
|
|
// Ignore pending exception (ThreadDeath), since we are exiting anyway
|
|
thread->clear_pending_exception();
|
|
// Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED.
|
|
java_lang_Thread::set_thread_status(threadObj(), JavaThreadStatus::TERMINATED);
|
|
// Clear the native thread instance - this makes isAlive return false and allows the join()
|
|
// to complete once we've done the notify_all below
|
|
java_lang_Thread::set_thread(threadObj(), NULL);
|
|
lock.notify_all(thread);
|
|
// Ignore pending exception (ThreadDeath), since we are exiting anyway
|
|
thread->clear_pending_exception();
|
|
}
|
|
|
|
static bool is_daemon(oop threadObj) {
|
|
return (threadObj != NULL && java_lang_Thread::is_daemon(threadObj));
|
|
}
|
|
|
|
// For any new cleanup additions, please check to see if they need to be applied to
|
|
// cleanup_failed_attach_current_thread as well.
|
|
void JavaThread::exit(bool destroy_vm, ExitType exit_type) {
|
|
assert(this == JavaThread::current(), "thread consistency check");
|
|
|
|
elapsedTimer _timer_exit_phase1;
|
|
elapsedTimer _timer_exit_phase2;
|
|
elapsedTimer _timer_exit_phase3;
|
|
elapsedTimer _timer_exit_phase4;
|
|
|
|
if (log_is_enabled(Debug, os, thread, timer)) {
|
|
_timer_exit_phase1.start();
|
|
}
|
|
|
|
HandleMark hm(this);
|
|
Handle uncaught_exception(this, this->pending_exception());
|
|
this->clear_pending_exception();
|
|
Handle threadObj(this, this->threadObj());
|
|
assert(threadObj.not_null(), "Java thread object should be created");
|
|
|
|
if (!destroy_vm) {
|
|
if (uncaught_exception.not_null()) {
|
|
EXCEPTION_MARK;
|
|
// Call method Thread.dispatchUncaughtException().
|
|
Klass* thread_klass = vmClasses::Thread_klass();
|
|
JavaValue result(T_VOID);
|
|
JavaCalls::call_virtual(&result,
|
|
threadObj, thread_klass,
|
|
vmSymbols::dispatchUncaughtException_name(),
|
|
vmSymbols::throwable_void_signature(),
|
|
uncaught_exception,
|
|
THREAD);
|
|
if (HAS_PENDING_EXCEPTION) {
|
|
ResourceMark rm(this);
|
|
jio_fprintf(defaultStream::error_stream(),
|
|
"\nException: %s thrown from the UncaughtExceptionHandler"
|
|
" in thread \"%s\"\n",
|
|
pending_exception()->klass()->external_name(),
|
|
name());
|
|
CLEAR_PENDING_EXCEPTION;
|
|
}
|
|
}
|
|
|
|
if (!is_Compiler_thread()) {
|
|
// We have finished executing user-defined Java code and now have to do the
|
|
// implementation specific clean-up by calling Thread.exit(). We prevent any
|
|
// asynchronous exceptions from being delivered while in Thread.exit()
|
|
// to ensure the clean-up is not corrupted.
|
|
NoAsyncExceptionDeliveryMark _no_async(this);
|
|
|
|
EXCEPTION_MARK;
|
|
JavaValue result(T_VOID);
|
|
Klass* thread_klass = vmClasses::Thread_klass();
|
|
JavaCalls::call_virtual(&result,
|
|
threadObj, thread_klass,
|
|
vmSymbols::exit_method_name(),
|
|
vmSymbols::void_method_signature(),
|
|
THREAD);
|
|
CLEAR_PENDING_EXCEPTION;
|
|
}
|
|
|
|
// notify JVMTI
|
|
if (JvmtiExport::should_post_thread_life()) {
|
|
JvmtiExport::post_thread_end(this);
|
|
}
|
|
|
|
// The careful dance between thread suspension and exit is handled here.
|
|
// Since we are in thread_in_vm state and suspension is done with handshakes,
|
|
// we can just put in the exiting state and it will be correctly handled.
|
|
set_terminated(_thread_exiting);
|
|
|
|
ThreadService::current_thread_exiting(this, is_daemon(threadObj()));
|
|
} else {
|
|
assert(!is_terminated() && !is_exiting(), "must not be exiting");
|
|
// before_exit() has already posted JVMTI THREAD_END events
|
|
}
|
|
|
|
if (log_is_enabled(Debug, os, thread, timer)) {
|
|
_timer_exit_phase1.stop();
|
|
_timer_exit_phase2.start();
|
|
}
|
|
|
|
// Capture daemon status before the thread is marked as terminated.
|
|
bool daemon = is_daemon(threadObj());
|
|
|
|
// Notify waiters on thread object. This has to be done after exit() is called
|
|
// on the thread (if the thread is the last thread in a daemon ThreadGroup the
|
|
// group should have the destroyed bit set before waiters are notified).
|
|
ensure_join(this);
|
|
assert(!this->has_pending_exception(), "ensure_join should have cleared");
|
|
|
|
if (log_is_enabled(Debug, os, thread, timer)) {
|
|
_timer_exit_phase2.stop();
|
|
_timer_exit_phase3.start();
|
|
}
|
|
// 6282335 JNI DetachCurrentThread spec states that all Java monitors
|
|
// held by this thread must be released. The spec does not distinguish
|
|
// between JNI-acquired and regular Java monitors. We can only see
|
|
// regular Java monitors here if monitor enter-exit matching is broken.
|
|
//
|
|
// ensure_join() ignores IllegalThreadStateExceptions, and so does
|
|
// ObjectSynchronizer::release_monitors_owned_by_thread().
|
|
if (exit_type == jni_detach) {
|
|
// Sanity check even though JNI DetachCurrentThread() would have
|
|
// returned JNI_ERR if there was a Java frame. JavaThread exit
|
|
// should be done executing Java code by the time we get here.
|
|
assert(!this->has_last_Java_frame(),
|
|
"should not have a Java frame when detaching or exiting");
|
|
ObjectSynchronizer::release_monitors_owned_by_thread(this);
|
|
assert(!this->has_pending_exception(), "release_monitors should have cleared");
|
|
}
|
|
|
|
assert(!Continuations::enabled() || this->held_monitor_count() == 0, "held monitor count should be zero");
|
|
|
|
// These things needs to be done while we are still a Java Thread. Make sure that thread
|
|
// is in a consistent state, in case GC happens
|
|
JFR_ONLY(Jfr::on_thread_exit(this);)
|
|
|
|
if (active_handles() != NULL) {
|
|
JNIHandleBlock* block = active_handles();
|
|
set_active_handles(NULL);
|
|
JNIHandleBlock::release_block(block);
|
|
}
|
|
|
|
if (free_handle_block() != NULL) {
|
|
JNIHandleBlock* block = free_handle_block();
|
|
set_free_handle_block(NULL);
|
|
JNIHandleBlock::release_block(block);
|
|
}
|
|
|
|
// These have to be removed while this is still a valid thread.
|
|
_stack_overflow_state.remove_stack_guard_pages();
|
|
|
|
if (UseTLAB) {
|
|
tlab().retire();
|
|
}
|
|
|
|
if (JvmtiEnv::environments_might_exist()) {
|
|
JvmtiExport::cleanup_thread(this);
|
|
}
|
|
|
|
// We need to cache the thread name for logging purposes below as once
|
|
// we have called on_thread_detach this thread must not access any oops.
|
|
char* thread_name = NULL;
|
|
if (log_is_enabled(Debug, os, thread, timer)) {
|
|
ResourceMark rm(this);
|
|
thread_name = os::strdup(name());
|
|
}
|
|
|
|
log_info(os, thread)("JavaThread %s (tid: " UINTX_FORMAT ").",
|
|
exit_type == JavaThread::normal_exit ? "exiting" : "detaching",
|
|
os::current_thread_id());
|
|
|
|
if (log_is_enabled(Debug, os, thread, timer)) {
|
|
_timer_exit_phase3.stop();
|
|
_timer_exit_phase4.start();
|
|
}
|
|
|
|
#if INCLUDE_JVMCI
|
|
if (JVMCICounterSize > 0) {
|
|
if (jvmci_counters_include(this)) {
|
|
for (int i = 0; i < JVMCICounterSize; i++) {
|
|
_jvmci_old_thread_counters[i] += _jvmci_counters[i];
|
|
}
|
|
}
|
|
}
|
|
#endif // INCLUDE_JVMCI
|
|
|
|
// Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread
|
|
Threads::remove(this, daemon);
|
|
|
|
if (log_is_enabled(Debug, os, thread, timer)) {
|
|
_timer_exit_phase4.stop();
|
|
log_debug(os, thread, timer)("name='%s'"
|
|
", exit-phase1=" JLONG_FORMAT
|
|
", exit-phase2=" JLONG_FORMAT
|
|
", exit-phase3=" JLONG_FORMAT
|
|
", exit-phase4=" JLONG_FORMAT,
|
|
thread_name,
|
|
_timer_exit_phase1.milliseconds(),
|
|
_timer_exit_phase2.milliseconds(),
|
|
_timer_exit_phase3.milliseconds(),
|
|
_timer_exit_phase4.milliseconds());
|
|
os::free(thread_name);
|
|
}
|
|
}
|
|
|
|
void JavaThread::cleanup_failed_attach_current_thread(bool is_daemon) {
|
|
if (active_handles() != NULL) {
|
|
JNIHandleBlock* block = active_handles();
|
|
set_active_handles(NULL);
|
|
JNIHandleBlock::release_block(block);
|
|
}
|
|
|
|
if (free_handle_block() != NULL) {
|
|
JNIHandleBlock* block = free_handle_block();
|
|
set_free_handle_block(NULL);
|
|
JNIHandleBlock::release_block(block);
|
|
}
|
|
|
|
// These have to be removed while this is still a valid thread.
|
|
_stack_overflow_state.remove_stack_guard_pages();
|
|
|
|
if (UseTLAB) {
|
|
tlab().retire();
|
|
}
|
|
|
|
Threads::remove(this, is_daemon);
|
|
this->smr_delete();
|
|
}
|
|
|
|
JavaThread* JavaThread::active() {
|
|
Thread* thread = Thread::current();
|
|
if (thread->is_Java_thread()) {
|
|
return JavaThread::cast(thread);
|
|
} else {
|
|
assert(thread->is_VM_thread(), "this must be a vm thread");
|
|
VM_Operation* op = ((VMThread*) thread)->vm_operation();
|
|
JavaThread *ret = op == NULL ? NULL : JavaThread::cast(op->calling_thread());
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
bool JavaThread::is_lock_owned(address adr) const {
|
|
if (Thread::is_lock_owned(adr)) return true;
|
|
|
|
for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) {
|
|
if (chunk->contains(adr)) return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool JavaThread::is_lock_owned_current(address adr) const {
|
|
address stack_end = _stack_base - _stack_size;
|
|
const ContinuationEntry* ce = vthread_continuation();
|
|
address stack_base = ce != nullptr ? (address)ce->entry_sp() : _stack_base;
|
|
if (stack_base > adr && adr >= stack_end) {
|
|
return true;
|
|
}
|
|
|
|
for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) {
|
|
if (chunk->contains(adr)) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool JavaThread::is_lock_owned_carrier(address adr) const {
|
|
assert(is_vthread_mounted(), "");
|
|
address stack_end = _stack_base - _stack_size;
|
|
address stack_base = (address)vthread_continuation()->entry_sp();
|
|
return stack_base > adr && adr >= stack_end;
|
|
}
|
|
|
|
oop JavaThread::exception_oop() const {
|
|
return Atomic::load(&_exception_oop);
|
|
}
|
|
|
|
void JavaThread::set_exception_oop(oop o) {
|
|
Atomic::store(&_exception_oop, o);
|
|
}
|
|
|
|
void JavaThread::add_monitor_chunk(MonitorChunk* chunk) {
|
|
chunk->set_next(monitor_chunks());
|
|
set_monitor_chunks(chunk);
|
|
}
|
|
|
|
void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) {
|
|
guarantee(monitor_chunks() != NULL, "must be non empty");
|
|
if (monitor_chunks() == chunk) {
|
|
set_monitor_chunks(chunk->next());
|
|
} else {
|
|
MonitorChunk* prev = monitor_chunks();
|
|
while (prev->next() != chunk) prev = prev->next();
|
|
prev->set_next(chunk->next());
|
|
}
|
|
}
|
|
|
|
void JavaThread::handle_special_runtime_exit_condition() {
|
|
if (is_obj_deopt_suspend()) {
|
|
frame_anchor()->make_walkable();
|
|
wait_for_object_deoptimization();
|
|
}
|
|
JFR_ONLY(SUSPEND_THREAD_CONDITIONAL(this);)
|
|
}
|
|
|
|
|
|
// Asynchronous exceptions support
|
|
//
|
|
void JavaThread::handle_async_exception(oop java_throwable) {
|
|
assert(java_throwable != NULL, "should have an _async_exception to throw");
|
|
assert(!is_at_poll_safepoint(), "should have never called this method");
|
|
|
|
if (has_last_Java_frame()) {
|
|
frame f = last_frame();
|
|
if (f.is_runtime_frame()) {
|
|
// If the topmost frame is a runtime stub, then we are calling into
|
|
// OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..)
|
|
// must deoptimize the caller before continuing, as the compiled exception
|
|
// handler table may not be valid.
|
|
RegisterMap reg_map(this, false);
|
|
frame compiled_frame = f.sender(®_map);
|
|
if (!StressCompiledExceptionHandlers && compiled_frame.can_be_deoptimized()) {
|
|
Deoptimization::deoptimize(this, compiled_frame);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Only overwrite an already pending exception if it is not a ThreadDeath.
|
|
if (!has_pending_exception() || !pending_exception()->is_a(vmClasses::ThreadDeath_klass())) {
|
|
|
|
// We cannot call Exceptions::_throw(...) here because we cannot block
|
|
set_pending_exception(java_throwable, __FILE__, __LINE__);
|
|
|
|
// Clear any extent-local bindings on ThreadDeath
|
|
set_extentLocalCache(NULL);
|
|
oop threadOop = threadObj();
|
|
assert(threadOop != NULL, "must be");
|
|
java_lang_Thread::clear_extentLocalBindings(threadOop);
|
|
|
|
LogTarget(Info, exceptions) lt;
|
|
if (lt.is_enabled()) {
|
|
ResourceMark rm;
|
|
LogStream ls(lt);
|
|
ls.print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", p2i(this));
|
|
if (has_last_Java_frame()) {
|
|
frame f = last_frame();
|
|
ls.print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", p2i(f.pc()), p2i(f.sp()));
|
|
}
|
|
ls.print_cr(" of type: %s", java_throwable->klass()->external_name());
|
|
}
|
|
}
|
|
}
|
|
|
|
void JavaThread::install_async_exception(AsyncExceptionHandshake* aeh) {
|
|
// Do not throw asynchronous exceptions against the compiler thread.
|
|
if (!can_call_java()) {
|
|
delete aeh;
|
|
return;
|
|
}
|
|
|
|
// Don't install a new pending async exception if there is already
|
|
// a pending ThreadDeath one. Just interrupt thread from potential
|
|
// wait()/sleep()/park() and return.
|
|
if (has_async_exception_condition(true /* ThreadDeath_only */)) {
|
|
java_lang_Thread::set_interrupted(threadObj(), true);
|
|
this->interrupt();
|
|
delete aeh;
|
|
return;
|
|
}
|
|
|
|
oop exception = aeh->exception();
|
|
Handshake::execute(aeh, this); // Install asynchronous handshake
|
|
|
|
ResourceMark rm;
|
|
if (log_is_enabled(Info, exceptions)) {
|
|
log_info(exceptions)("Pending Async. exception installed of type: %s",
|
|
InstanceKlass::cast(exception->klass())->external_name());
|
|
}
|
|
// for AbortVMOnException flag
|
|
Exceptions::debug_check_abort(exception->klass()->external_name());
|
|
|
|
// Interrupt thread so it will wake up from a potential wait()/sleep()/park()
|
|
java_lang_Thread::set_interrupted(threadObj(), true);
|
|
this->interrupt();
|
|
}
|
|
|
|
class InstallAsyncExceptionHandshake : public HandshakeClosure {
|
|
AsyncExceptionHandshake* _aeh;
|
|
public:
|
|
InstallAsyncExceptionHandshake(AsyncExceptionHandshake* aeh) :
|
|
HandshakeClosure("InstallAsyncException"), _aeh(aeh) {}
|
|
~InstallAsyncExceptionHandshake() {
|
|
// If InstallAsyncExceptionHandshake was never executed we need to clean up _aeh.
|
|
delete _aeh;
|
|
}
|
|
void do_thread(Thread* thr) {
|
|
JavaThread* target = JavaThread::cast(thr);
|
|
target->install_async_exception(_aeh);
|
|
_aeh = nullptr;
|
|
}
|
|
};
|
|
|
|
void JavaThread::send_async_exception(JavaThread* target, oop java_throwable) {
|
|
OopHandle e(Universe::vm_global(), java_throwable);
|
|
InstallAsyncExceptionHandshake iaeh(new AsyncExceptionHandshake(e));
|
|
Handshake::execute(&iaeh, target);
|
|
}
|
|
|
|
#if INCLUDE_JVMTI
|
|
void JavaThread::set_is_in_VTMS_transition(bool val) {
|
|
_is_in_VTMS_transition = val;
|
|
}
|
|
|
|
#ifdef ASSERT
|
|
void JavaThread::set_is_VTMS_transition_disabler(bool val) {
|
|
_is_VTMS_transition_disabler = val;
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
// External suspension mechanism.
|
|
//
|
|
// Guarantees on return (for a valid target thread):
|
|
// - Target thread will not execute any new bytecode.
|
|
// - Target thread will not enter any new monitors.
|
|
//
|
|
bool JavaThread::java_suspend() {
|
|
#if INCLUDE_JVMTI
|
|
// Suspending a JavaThread in VTMS transition or disabling VTMS transitions can cause deadlocks.
|
|
assert(!is_in_VTMS_transition(), "no suspend allowed in VTMS transition");
|
|
assert(!is_VTMS_transition_disabler(), "no suspend allowed for VTMS transition disablers");
|
|
#endif
|
|
|
|
guarantee(Thread::is_JavaThread_protected(/* target */ this),
|
|
"target JavaThread is not protected in calling context.");
|
|
return this->handshake_state()->suspend();
|
|
}
|
|
|
|
bool JavaThread::java_resume() {
|
|
guarantee(Thread::is_JavaThread_protected_by_TLH(/* target */ this),
|
|
"missing ThreadsListHandle in calling context.");
|
|
return this->handshake_state()->resume();
|
|
}
|
|
|
|
// Wait for another thread to perform object reallocation and relocking on behalf of
|
|
// this thread. The current thread is required to change to _thread_blocked in order
|
|
// to be seen to be safepoint/handshake safe whilst suspended and only after becoming
|
|
// handshake safe, the other thread can complete the handshake used to synchronize
|
|
// with this thread and then perform the reallocation and relocking.
|
|
// See EscapeBarrier::sync_and_suspend_*()
|
|
|
|
void JavaThread::wait_for_object_deoptimization() {
|
|
assert(!has_last_Java_frame() || frame_anchor()->walkable(), "should have walkable stack");
|
|
assert(this == Thread::current(), "invariant");
|
|
|
|
bool spin_wait = os::is_MP();
|
|
do {
|
|
ThreadBlockInVM tbivm(this, true /* allow_suspend */);
|
|
// Wait for object deoptimization if requested.
|
|
if (spin_wait) {
|
|
// A single deoptimization is typically very short. Microbenchmarks
|
|
// showed 5% better performance when spinning.
|
|
const uint spin_limit = 10 * SpinYield::default_spin_limit;
|
|
SpinYield spin(spin_limit);
|
|
for (uint i = 0; is_obj_deopt_suspend() && i < spin_limit; i++) {
|
|
spin.wait();
|
|
}
|
|
// Spin just once
|
|
spin_wait = false;
|
|
} else {
|
|
MonitorLocker ml(this, EscapeBarrier_lock, Monitor::_no_safepoint_check_flag);
|
|
if (is_obj_deopt_suspend()) {
|
|
ml.wait();
|
|
}
|
|
}
|
|
// A handshake for obj. deoptimization suspend could have been processed so
|
|
// we must check after processing.
|
|
} while (is_obj_deopt_suspend());
|
|
}
|
|
|
|
#ifdef ASSERT
|
|
// Verify the JavaThread has not yet been published in the Threads::list, and
|
|
// hence doesn't need protection from concurrent access at this stage.
|
|
void JavaThread::verify_not_published() {
|
|
// Cannot create a ThreadsListHandle here and check !tlh.includes(this)
|
|
// since an unpublished JavaThread doesn't participate in the
|
|
// Thread-SMR protocol for keeping a ThreadsList alive.
|
|
assert(!on_thread_list(), "JavaThread shouldn't have been published yet!");
|
|
}
|
|
#endif
|
|
|
|
// Slow path when the native==>Java barriers detect a safepoint/handshake is
|
|
// pending, when _suspend_flags is non-zero or when we need to process a stack
|
|
// watermark. Also check for pending async exceptions (except unsafe access error).
|
|
// Note only the native==>Java barriers can call this function when thread state
|
|
// is _thread_in_native_trans.
|
|
void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) {
|
|
assert(thread->thread_state() == _thread_in_native_trans, "wrong state");
|
|
assert(!thread->has_last_Java_frame() || thread->frame_anchor()->walkable(), "Unwalkable stack in native->Java transition");
|
|
|
|
thread->set_thread_state(_thread_in_vm);
|
|
|
|
// Enable WXWrite: called directly from interpreter native wrapper.
|
|
MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, thread));
|
|
|
|
SafepointMechanism::process_if_requested_with_exit_check(thread, true /* check asyncs */);
|
|
|
|
// After returning from native, it could be that the stack frames are not
|
|
// yet safe to use. We catch such situations in the subsequent stack watermark
|
|
// barrier, which will trap unsafe stack frames.
|
|
StackWatermarkSet::before_unwind(thread);
|
|
}
|
|
|
|
#ifndef PRODUCT
|
|
// Deoptimization
|
|
// Function for testing deoptimization
|
|
void JavaThread::deoptimize() {
|
|
StackFrameStream fst(this, false /* update */, true /* process_frames */);
|
|
bool deopt = false; // Dump stack only if a deopt actually happens.
|
|
bool only_at = strlen(DeoptimizeOnlyAt) > 0;
|
|
// Iterate over all frames in the thread and deoptimize
|
|
for (; !fst.is_done(); fst.next()) {
|
|
if (fst.current()->can_be_deoptimized()) {
|
|
|
|
if (only_at) {
|
|
// Deoptimize only at particular bcis. DeoptimizeOnlyAt
|
|
// consists of comma or carriage return separated numbers so
|
|
// search for the current bci in that string.
|
|
address pc = fst.current()->pc();
|
|
nmethod* nm = (nmethod*) fst.current()->cb();
|
|
ScopeDesc* sd = nm->scope_desc_at(pc);
|
|
char buffer[8];
|
|
jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci());
|
|
size_t len = strlen(buffer);
|
|
const char * found = strstr(DeoptimizeOnlyAt, buffer);
|
|
while (found != NULL) {
|
|
if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') &&
|
|
(found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) {
|
|
// Check that the bci found is bracketed by terminators.
|
|
break;
|
|
}
|
|
found = strstr(found + 1, buffer);
|
|
}
|
|
if (!found) {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (DebugDeoptimization && !deopt) {
|
|
deopt = true; // One-time only print before deopt
|
|
tty->print_cr("[BEFORE Deoptimization]");
|
|
trace_frames();
|
|
trace_stack();
|
|
}
|
|
Deoptimization::deoptimize(this, *fst.current());
|
|
}
|
|
}
|
|
|
|
if (DebugDeoptimization && deopt) {
|
|
tty->print_cr("[AFTER Deoptimization]");
|
|
trace_frames();
|
|
}
|
|
}
|
|
|
|
|
|
// Make zombies
|
|
void JavaThread::make_zombies() {
|
|
for (StackFrameStream fst(this, true /* update */, true /* process_frames */); !fst.is_done(); fst.next()) {
|
|
if (fst.current()->can_be_deoptimized()) {
|
|
// it is a Java nmethod
|
|
nmethod* nm = CodeCache::find_nmethod(fst.current()->pc());
|
|
nm->make_not_entrant();
|
|
}
|
|
}
|
|
}
|
|
#endif // PRODUCT
|
|
|
|
|
|
void JavaThread::deoptimize_marked_methods() {
|
|
if (!has_last_Java_frame()) return;
|
|
StackFrameStream fst(this, false /* update */, true /* process_frames */);
|
|
for (; !fst.is_done(); fst.next()) {
|
|
if (fst.current()->should_be_deoptimized()) {
|
|
Deoptimization::deoptimize(this, *fst.current());
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef ASSERT
|
|
void JavaThread::verify_frame_info() {
|
|
assert((!has_last_Java_frame() && java_call_counter() == 0) ||
|
|
(has_last_Java_frame() && java_call_counter() > 0),
|
|
"unexpected frame info: has_last_frame=%s, java_call_counter=%d",
|
|
has_last_Java_frame() ? "true" : "false", java_call_counter());
|
|
}
|
|
#endif
|
|
|
|
// Push on a new block of JNI handles.
|
|
void JavaThread::push_jni_handle_block() {
|
|
// Allocate a new block for JNI handles.
|
|
// Inlined code from jni_PushLocalFrame()
|
|
JNIHandleBlock* old_handles = active_handles();
|
|
JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(this);
|
|
assert(old_handles != NULL && new_handles != NULL, "should not be NULL");
|
|
new_handles->set_pop_frame_link(old_handles); // make sure java handles get gc'd.
|
|
set_active_handles(new_handles);
|
|
}
|
|
|
|
// Pop off the current block of JNI handles.
|
|
void JavaThread::pop_jni_handle_block() {
|
|
// Release our JNI handle block
|
|
JNIHandleBlock* old_handles = active_handles();
|
|
JNIHandleBlock* new_handles = old_handles->pop_frame_link();
|
|
assert(new_handles != nullptr, "should never set active handles to null");
|
|
set_active_handles(new_handles);
|
|
old_handles->set_pop_frame_link(NULL);
|
|
JNIHandleBlock::release_block(old_handles, this);
|
|
}
|
|
|
|
void JavaThread::oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf) {
|
|
// Verify that the deferred card marks have been flushed.
|
|
assert(deferred_card_mark().is_empty(), "Should be empty during GC");
|
|
|
|
// Traverse the GCHandles
|
|
Thread::oops_do_no_frames(f, cf);
|
|
|
|
if (active_handles() != NULL) {
|
|
active_handles()->oops_do(f);
|
|
}
|
|
|
|
DEBUG_ONLY(verify_frame_info();)
|
|
|
|
if (has_last_Java_frame()) {
|
|
// Traverse the monitor chunks
|
|
for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) {
|
|
chunk->oops_do(f);
|
|
}
|
|
}
|
|
|
|
assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!");
|
|
// If we have deferred set_locals there might be oops waiting to be
|
|
// written
|
|
GrowableArray<jvmtiDeferredLocalVariableSet*>* list = JvmtiDeferredUpdates::deferred_locals(this);
|
|
if (list != NULL) {
|
|
for (int i = 0; i < list->length(); i++) {
|
|
list->at(i)->oops_do(f);
|
|
}
|
|
}
|
|
|
|
// Traverse instance variables at the end since the GC may be moving things
|
|
// around using this function
|
|
f->do_oop((oop*) &_vm_result);
|
|
f->do_oop((oop*) &_exception_oop);
|
|
#if INCLUDE_JVMCI
|
|
f->do_oop((oop*) &_jvmci_reserved_oop0);
|
|
#endif
|
|
|
|
if (jvmti_thread_state() != NULL) {
|
|
jvmti_thread_state()->oops_do(f, cf);
|
|
}
|
|
}
|
|
|
|
void JavaThread::oops_do_frames(OopClosure* f, CodeBlobClosure* cf) {
|
|
if (!has_last_Java_frame()) {
|
|
return;
|
|
}
|
|
// Finish any pending lazy GC activity for the frames
|
|
StackWatermarkSet::finish_processing(this, NULL /* context */, StackWatermarkKind::gc);
|
|
// Traverse the execution stack
|
|
for (StackFrameStream fst(this, true /* update */, false /* process_frames */); !fst.is_done(); fst.next()) {
|
|
fst.current()->oops_do(f, cf, fst.register_map());
|
|
}
|
|
}
|
|
|
|
#ifdef ASSERT
|
|
void JavaThread::verify_states_for_handshake() {
|
|
// This checks that the thread has a correct frame state during a handshake.
|
|
verify_frame_info();
|
|
}
|
|
#endif
|
|
|
|
void JavaThread::nmethods_do(CodeBlobClosure* cf) {
|
|
DEBUG_ONLY(verify_frame_info();)
|
|
MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, Thread::current());)
|
|
|
|
if (has_last_Java_frame()) {
|
|
// Traverse the execution stack
|
|
for (StackFrameStream fst(this, true /* update */, true /* process_frames */); !fst.is_done(); fst.next()) {
|
|
fst.current()->nmethods_do(cf);
|
|
}
|
|
}
|
|
|
|
if (jvmti_thread_state() != NULL) {
|
|
jvmti_thread_state()->nmethods_do(cf);
|
|
}
|
|
}
|
|
|
|
void JavaThread::metadata_do(MetadataClosure* f) {
|
|
if (has_last_Java_frame()) {
|
|
// Traverse the execution stack to call f() on the methods in the stack
|
|
for (StackFrameStream fst(this, true /* update */, true /* process_frames */); !fst.is_done(); fst.next()) {
|
|
fst.current()->metadata_do(f);
|
|
}
|
|
} else if (is_Compiler_thread()) {
|
|
// need to walk ciMetadata in current compile tasks to keep alive.
|
|
CompilerThread* ct = (CompilerThread*)this;
|
|
if (ct->env() != NULL) {
|
|
ct->env()->metadata_do(f);
|
|
}
|
|
CompileTask* task = ct->task();
|
|
if (task != NULL) {
|
|
task->metadata_do(f);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Printing
|
|
const char* _get_thread_state_name(JavaThreadState _thread_state) {
|
|
switch (_thread_state) {
|
|
case _thread_uninitialized: return "_thread_uninitialized";
|
|
case _thread_new: return "_thread_new";
|
|
case _thread_new_trans: return "_thread_new_trans";
|
|
case _thread_in_native: return "_thread_in_native";
|
|
case _thread_in_native_trans: return "_thread_in_native_trans";
|
|
case _thread_in_vm: return "_thread_in_vm";
|
|
case _thread_in_vm_trans: return "_thread_in_vm_trans";
|
|
case _thread_in_Java: return "_thread_in_Java";
|
|
case _thread_in_Java_trans: return "_thread_in_Java_trans";
|
|
case _thread_blocked: return "_thread_blocked";
|
|
case _thread_blocked_trans: return "_thread_blocked_trans";
|
|
default: return "unknown thread state";
|
|
}
|
|
}
|
|
|
|
void JavaThread::print_thread_state_on(outputStream *st) const {
|
|
st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state));
|
|
}
|
|
|
|
const char* JavaThread::thread_state_name() const {
|
|
return _get_thread_state_name(_thread_state);
|
|
}
|
|
|
|
// Called by Threads::print() for VM_PrintThreads operation
|
|
void JavaThread::print_on(outputStream *st, bool print_extended_info) const {
|
|
st->print_raw("\"");
|
|
st->print_raw(name());
|
|
st->print_raw("\" ");
|
|
oop thread_oop = threadObj();
|
|
if (thread_oop != NULL) {
|
|
st->print("#" INT64_FORMAT " [%ld] ", (int64_t)java_lang_Thread::thread_id(thread_oop), (long) osthread()->thread_id());
|
|
if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon ");
|
|
st->print("prio=%d ", java_lang_Thread::priority(thread_oop));
|
|
}
|
|
Thread::print_on(st, print_extended_info);
|
|
// print guess for valid stack memory region (assume 4K pages); helps lock debugging
|
|
st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12));
|
|
if (thread_oop != NULL) {
|
|
if (is_vthread_mounted()) {
|
|
oop vt = vthread();
|
|
assert(vt != NULL, "");
|
|
st->print_cr(" Carrying virtual thread #" INT64_FORMAT, (int64_t)java_lang_Thread::thread_id(vt));
|
|
} else {
|
|
st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop));
|
|
}
|
|
}
|
|
#ifndef PRODUCT
|
|
_safepoint_state->print_on(st);
|
|
#endif // PRODUCT
|
|
if (is_Compiler_thread()) {
|
|
CompileTask *task = ((CompilerThread*)this)->task();
|
|
if (task != NULL) {
|
|
st->print(" Compiling: ");
|
|
task->print(st, NULL, true, false);
|
|
} else {
|
|
st->print(" No compile task");
|
|
}
|
|
st->cr();
|
|
}
|
|
}
|
|
|
|
void JavaThread::print() const { print_on(tty); }
|
|
|
|
void JavaThread::print_name_on_error(outputStream* st, char *buf, int buflen) const {
|
|
st->print("%s", get_thread_name_string(buf, buflen));
|
|
}
|
|
|
|
// Called by fatal error handler. The difference between this and
|
|
// JavaThread::print() is that we can't grab lock or allocate memory.
|
|
void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const {
|
|
st->print("%s \"%s\"", type_name(), get_thread_name_string(buf, buflen));
|
|
oop thread_obj = threadObj();
|
|
if (thread_obj != NULL) {
|
|
if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon");
|
|
}
|
|
st->print(" [");
|
|
st->print("%s", _get_thread_state_name(_thread_state));
|
|
if (osthread()) {
|
|
st->print(", id=%d", osthread()->thread_id());
|
|
}
|
|
st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")",
|
|
p2i(stack_end()), p2i(stack_base()));
|
|
st->print("]");
|
|
|
|
ThreadsSMRSupport::print_info_on(this, st);
|
|
return;
|
|
}
|
|
|
|
|
|
// Verification
|
|
|
|
void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) {
|
|
// ignore if there is no stack
|
|
if (!has_last_Java_frame()) return;
|
|
// traverse the stack frames. Starts from top frame.
|
|
for (StackFrameStream fst(this, true /* update */, true /* process_frames */); !fst.is_done(); fst.next()) {
|
|
frame* fr = fst.current();
|
|
f(fr, fst.register_map());
|
|
}
|
|
}
|
|
|
|
static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); }
|
|
|
|
void JavaThread::verify() {
|
|
// Verify oops in the thread.
|
|
oops_do(&VerifyOopClosure::verify_oop, NULL);
|
|
|
|
// Verify the stack frames.
|
|
frames_do(frame_verify);
|
|
}
|
|
|
|
// CR 6300358 (sub-CR 2137150)
|
|
// Most callers of this method assume that it can't return NULL but a
|
|
// thread may not have a name whilst it is in the process of attaching to
|
|
// the VM - see CR 6412693, and there are places where a JavaThread can be
|
|
// seen prior to having its threadObj set (e.g., JNI attaching threads and
|
|
// if vm exit occurs during initialization). These cases can all be accounted
|
|
// for such that this method never returns NULL.
|
|
const char* JavaThread::name() const {
|
|
if (Thread::is_JavaThread_protected(/* target */ this)) {
|
|
// The target JavaThread is protected so get_thread_name_string() is safe:
|
|
return get_thread_name_string();
|
|
}
|
|
|
|
// The target JavaThread is not protected so we return the default:
|
|
return Thread::name();
|
|
}
|
|
|
|
// Returns a non-NULL representation of this thread's name, or a suitable
|
|
// descriptive string if there is no set name.
|
|
const char* JavaThread::get_thread_name_string(char* buf, int buflen) const {
|
|
const char* name_str;
|
|
oop thread_obj = threadObj();
|
|
if (thread_obj != NULL) {
|
|
oop name = java_lang_Thread::name(thread_obj);
|
|
if (name != NULL) {
|
|
if (buf == NULL) {
|
|
name_str = java_lang_String::as_utf8_string(name);
|
|
} else {
|
|
name_str = java_lang_String::as_utf8_string(name, buf, buflen);
|
|
}
|
|
} else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306
|
|
name_str = "<no-name - thread is attaching>";
|
|
} else {
|
|
name_str = "<un-named>";
|
|
}
|
|
} else {
|
|
name_str = Thread::name();
|
|
}
|
|
assert(name_str != NULL, "unexpected NULL thread name");
|
|
return name_str;
|
|
}
|
|
|
|
// Helper to extract the name from the thread oop for logging.
|
|
const char* JavaThread::name_for(oop thread_obj) {
|
|
assert(thread_obj != NULL, "precondition");
|
|
oop name = java_lang_Thread::name(thread_obj);
|
|
const char* name_str;
|
|
if (name != NULL) {
|
|
name_str = java_lang_String::as_utf8_string(name);
|
|
} else {
|
|
name_str = "<un-named>";
|
|
}
|
|
return name_str;
|
|
}
|
|
|
|
void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) {
|
|
|
|
assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
|
|
assert(NoPriority <= prio && prio <= MaxPriority, "sanity check");
|
|
// Link Java Thread object <-> C++ Thread
|
|
|
|
// Get the C++ thread object (an oop) from the JNI handle (a jthread)
|
|
// and put it into a new Handle. The Handle "thread_oop" can then
|
|
// be used to pass the C++ thread object to other methods.
|
|
|
|
// Set the Java level thread object (jthread) field of the
|
|
// new thread (a JavaThread *) to C++ thread object using the
|
|
// "thread_oop" handle.
|
|
|
|
// Set the thread field (a JavaThread *) of the
|
|
// oop representing the java_lang_Thread to the new thread (a JavaThread *).
|
|
|
|
Handle thread_oop(Thread::current(),
|
|
JNIHandles::resolve_non_null(jni_thread));
|
|
assert(InstanceKlass::cast(thread_oop->klass())->is_linked(),
|
|
"must be initialized");
|
|
set_threadOopHandles(thread_oop());
|
|
java_lang_Thread::set_thread(thread_oop(), this);
|
|
|
|
if (prio == NoPriority) {
|
|
prio = java_lang_Thread::priority(thread_oop());
|
|
assert(prio != NoPriority, "A valid priority should be present");
|
|
}
|
|
|
|
// Push the Java priority down to the native thread; needs Threads_lock
|
|
Thread::set_priority(this, prio);
|
|
|
|
// Add the new thread to the Threads list and set it in motion.
|
|
// We must have threads lock in order to call Threads::add.
|
|
// It is crucial that we do not block before the thread is
|
|
// added to the Threads list for if a GC happens, then the java_thread oop
|
|
// will not be visited by GC.
|
|
Threads::add(this);
|
|
}
|
|
|
|
oop JavaThread::current_park_blocker() {
|
|
// Support for JSR-166 locks
|
|
oop thread_oop = threadObj();
|
|
if (thread_oop != NULL) {
|
|
return java_lang_Thread::park_blocker(thread_oop);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
void JavaThread::print_stack_on(outputStream* st) {
|
|
if (!has_last_Java_frame()) return;
|
|
|
|
Thread* current_thread = Thread::current();
|
|
ResourceMark rm(current_thread);
|
|
HandleMark hm(current_thread);
|
|
|
|
RegisterMap reg_map(this, true, true);
|
|
vframe* start_vf = platform_thread_last_java_vframe(®_map);
|
|
int count = 0;
|
|
for (vframe* f = start_vf; f != NULL; f = f->sender()) {
|
|
if (f->is_java_frame()) {
|
|
javaVFrame* jvf = javaVFrame::cast(f);
|
|
java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci());
|
|
|
|
// Print out lock information
|
|
if (JavaMonitorsInStackTrace) {
|
|
jvf->print_lock_info_on(st, count);
|
|
}
|
|
} else {
|
|
// Ignore non-Java frames
|
|
}
|
|
|
|
// Bail-out case for too deep stacks if MaxJavaStackTraceDepth > 0
|
|
count++;
|
|
if (MaxJavaStackTraceDepth > 0 && MaxJavaStackTraceDepth == count) return;
|
|
}
|
|
}
|
|
|
|
#if INCLUDE_JVMTI
|
|
// Rebind JVMTI thread state from carrier to virtual or from virtual to carrier.
|
|
JvmtiThreadState* JavaThread::rebind_to_jvmti_thread_state_of(oop thread_oop) {
|
|
set_jvmti_vthread(thread_oop);
|
|
|
|
// unbind current JvmtiThreadState from JavaThread
|
|
JvmtiThreadState::unbind_from(jvmti_thread_state(), this);
|
|
|
|
// bind new JvmtiThreadState to JavaThread
|
|
JvmtiThreadState::bind_to(java_lang_Thread::jvmti_thread_state(thread_oop), this);
|
|
|
|
return jvmti_thread_state();
|
|
}
|
|
#endif
|
|
|
|
// JVMTI PopFrame support
|
|
void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) {
|
|
assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments");
|
|
if (in_bytes(size_in_bytes) != 0) {
|
|
_popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread);
|
|
_popframe_preserved_args_size = in_bytes(size_in_bytes);
|
|
Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size);
|
|
}
|
|
}
|
|
|
|
void* JavaThread::popframe_preserved_args() {
|
|
return _popframe_preserved_args;
|
|
}
|
|
|
|
ByteSize JavaThread::popframe_preserved_args_size() {
|
|
return in_ByteSize(_popframe_preserved_args_size);
|
|
}
|
|
|
|
WordSize JavaThread::popframe_preserved_args_size_in_words() {
|
|
int sz = in_bytes(popframe_preserved_args_size());
|
|
assert(sz % wordSize == 0, "argument size must be multiple of wordSize");
|
|
return in_WordSize(sz / wordSize);
|
|
}
|
|
|
|
void JavaThread::popframe_free_preserved_args() {
|
|
assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice");
|
|
FREE_C_HEAP_ARRAY(char, (char*)_popframe_preserved_args);
|
|
_popframe_preserved_args = NULL;
|
|
_popframe_preserved_args_size = 0;
|
|
}
|
|
|
|
#ifndef PRODUCT
|
|
|
|
void JavaThread::trace_frames() {
|
|
tty->print_cr("[Describe stack]");
|
|
int frame_no = 1;
|
|
for (StackFrameStream fst(this, true /* update */, true /* process_frames */); !fst.is_done(); fst.next()) {
|
|
tty->print(" %d. ", frame_no++);
|
|
fst.current()->print_value_on(tty, this);
|
|
tty->cr();
|
|
}
|
|
}
|
|
|
|
class PrintAndVerifyOopClosure: public OopClosure {
|
|
protected:
|
|
template <class T> inline void do_oop_work(T* p) {
|
|
oop obj = RawAccess<>::oop_load(p);
|
|
if (obj == NULL) return;
|
|
tty->print(INTPTR_FORMAT ": ", p2i(p));
|
|
if (oopDesc::is_oop_or_null(obj)) {
|
|
if (obj->is_objArray()) {
|
|
tty->print_cr("valid objArray: " INTPTR_FORMAT, p2i(obj));
|
|
} else {
|
|
obj->print();
|
|
}
|
|
} else {
|
|
tty->print_cr("invalid oop: " INTPTR_FORMAT, p2i(obj));
|
|
}
|
|
tty->cr();
|
|
}
|
|
public:
|
|
virtual void do_oop(oop* p) { do_oop_work(p); }
|
|
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
|
|
};
|
|
|
|
#ifdef ASSERT
|
|
// Print or validate the layout of stack frames
|
|
void JavaThread::print_frame_layout(int depth, bool validate_only) {
|
|
ResourceMark rm;
|
|
PreserveExceptionMark pm(this);
|
|
FrameValues values;
|
|
int frame_no = 0;
|
|
for (StackFrameStream fst(this, true, true, true); !fst.is_done(); fst.next()) {
|
|
fst.current()->describe(values, ++frame_no, fst.register_map());
|
|
if (depth == frame_no) break;
|
|
}
|
|
Continuation::describe(values);
|
|
if (validate_only) {
|
|
values.validate();
|
|
} else {
|
|
tty->print_cr("[Describe stack layout]");
|
|
values.print(this);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
void JavaThread::trace_stack_from(vframe* start_vf) {
|
|
ResourceMark rm;
|
|
int vframe_no = 1;
|
|
for (vframe* f = start_vf; f; f = f->sender()) {
|
|
if (f->is_java_frame()) {
|
|
javaVFrame::cast(f)->print_activation(vframe_no++);
|
|
} else {
|
|
f->print();
|
|
}
|
|
if (vframe_no > StackPrintLimit) {
|
|
tty->print_cr("...<more frames>...");
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void JavaThread::trace_stack() {
|
|
if (!has_last_Java_frame()) return;
|
|
Thread* current_thread = Thread::current();
|
|
ResourceMark rm(current_thread);
|
|
HandleMark hm(current_thread);
|
|
RegisterMap reg_map(this, true, true);
|
|
trace_stack_from(last_java_vframe(®_map));
|
|
}
|
|
|
|
|
|
#endif // PRODUCT
|
|
|
|
void JavaThread::inc_held_monitor_count() {
|
|
if (!Continuations::enabled()) {
|
|
return;
|
|
}
|
|
_held_monitor_count++;
|
|
}
|
|
|
|
void JavaThread::dec_held_monitor_count() {
|
|
if (!Continuations::enabled()) {
|
|
return;
|
|
}
|
|
assert(_held_monitor_count > 0, "");
|
|
_held_monitor_count--;
|
|
}
|
|
|
|
frame JavaThread::vthread_last_frame() {
|
|
assert (is_vthread_mounted(), "Virtual thread not mounted");
|
|
return last_frame();
|
|
}
|
|
|
|
frame JavaThread::carrier_last_frame(RegisterMap* reg_map) {
|
|
const ContinuationEntry* entry = vthread_continuation();
|
|
guarantee (entry != NULL, "Not a carrier thread");
|
|
frame f = entry->to_frame();
|
|
if (reg_map->process_frames()) {
|
|
entry->flush_stack_processing(this);
|
|
}
|
|
entry->update_register_map(reg_map);
|
|
return f.sender(reg_map);
|
|
}
|
|
|
|
frame JavaThread::platform_thread_last_frame(RegisterMap* reg_map) {
|
|
return is_vthread_mounted() ? carrier_last_frame(reg_map) : last_frame();
|
|
}
|
|
|
|
javaVFrame* JavaThread::last_java_vframe(const frame f, RegisterMap *reg_map) {
|
|
assert(reg_map != NULL, "a map must be given");
|
|
for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender()) {
|
|
if (vf->is_java_frame()) return javaVFrame::cast(vf);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
oop JavaThread::get_continuation() const {
|
|
assert(threadObj() != nullptr, "must be set");
|
|
return java_lang_Thread::continuation(threadObj());
|
|
}
|
|
|
|
Klass* JavaThread::security_get_caller_class(int depth) {
|
|
ResetNoHandleMark rnhm;
|
|
HandleMark hm(Thread::current());
|
|
|
|
vframeStream vfst(this);
|
|
vfst.security_get_caller_frame(depth);
|
|
if (!vfst.at_end()) {
|
|
return vfst.method()->method_holder();
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
// java.lang.Thread.sleep support
|
|
// Returns true if sleep time elapsed as expected, and false
|
|
// if the thread was interrupted.
|
|
bool JavaThread::sleep(jlong millis) {
|
|
assert(this == Thread::current(), "thread consistency check");
|
|
|
|
ParkEvent * const slp = this->_SleepEvent;
|
|
// Because there can be races with thread interruption sending an unpark()
|
|
// to the event, we explicitly reset it here to avoid an immediate return.
|
|
// The actual interrupt state will be checked before we park().
|
|
slp->reset();
|
|
// Thread interruption establishes a happens-before ordering in the
|
|
// Java Memory Model, so we need to ensure we synchronize with the
|
|
// interrupt state.
|
|
OrderAccess::fence();
|
|
|
|
jlong prevtime = os::javaTimeNanos();
|
|
|
|
for (;;) {
|
|
// interruption has precedence over timing out
|
|
if (this->is_interrupted(true)) {
|
|
return false;
|
|
}
|
|
|
|
if (millis <= 0) {
|
|
return true;
|
|
}
|
|
|
|
{
|
|
ThreadBlockInVM tbivm(this);
|
|
OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */);
|
|
slp->park(millis);
|
|
}
|
|
|
|
// Update elapsed time tracking
|
|
jlong newtime = os::javaTimeNanos();
|
|
if (newtime - prevtime < 0) {
|
|
// time moving backwards, should only happen if no monotonic clock
|
|
// not a guarantee() because JVM should not abort on kernel/glibc bugs
|
|
assert(false,
|
|
"unexpected time moving backwards detected in JavaThread::sleep()");
|
|
} else {
|
|
millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
|
|
}
|
|
prevtime = newtime;
|
|
}
|
|
}
|
|
|
|
|
|
// ======= Threads ========
|
|
|
|
// The Threads class links together all active threads, and provides
|
|
// operations over all threads. It is protected by the Threads_lock,
|
|
// which is also used in other global contexts like safepointing.
|
|
// ThreadsListHandles are used to safely perform operations on one
|
|
// or more threads without the risk of the thread exiting during the
|
|
// operation.
|
|
//
|
|
// Note: The Threads_lock is currently more widely used than we
|
|
// would like. We are actively migrating Threads_lock uses to other
|
|
// mechanisms in order to reduce Threads_lock contention.
|
|
|
|
int Threads::_number_of_threads = 0;
|
|
int Threads::_number_of_non_daemon_threads = 0;
|
|
int Threads::_return_code = 0;
|
|
uintx Threads::_thread_claim_token = 1; // Never zero.
|
|
size_t JavaThread::_stack_size_at_create = 0;
|
|
|
|
#ifdef ASSERT
|
|
bool Threads::_vm_complete = false;
|
|
#endif
|
|
|
|
// All NonJavaThreads (i.e., every non-JavaThread in the system).
|
|
void Threads::non_java_threads_do(ThreadClosure* tc) {
|
|
NoSafepointVerifier nsv;
|
|
for (NonJavaThread::Iterator njti; !njti.end(); njti.step()) {
|
|
tc->do_thread(njti.current());
|
|
}
|
|
}
|
|
|
|
// All JavaThreads
|
|
#define ALL_JAVA_THREADS(X) \
|
|
for (JavaThread* X : *ThreadsSMRSupport::get_java_thread_list())
|
|
|
|
// All JavaThreads
|
|
void Threads::java_threads_do(ThreadClosure* tc) {
|
|
assert_locked_or_safepoint(Threads_lock);
|
|
// ALL_JAVA_THREADS iterates through all JavaThreads.
|
|
ALL_JAVA_THREADS(p) {
|
|
tc->do_thread(p);
|
|
}
|
|
}
|
|
|
|
void Threads::java_threads_and_vm_thread_do(ThreadClosure* tc) {
|
|
assert_locked_or_safepoint(Threads_lock);
|
|
java_threads_do(tc);
|
|
tc->do_thread(VMThread::vm_thread());
|
|
}
|
|
|
|
// All JavaThreads + all non-JavaThreads (i.e., every thread in the system).
|
|
void Threads::threads_do(ThreadClosure* tc) {
|
|
assert_locked_or_safepoint(Threads_lock);
|
|
java_threads_do(tc);
|
|
non_java_threads_do(tc);
|
|
}
|
|
|
|
void Threads::possibly_parallel_threads_do(bool is_par, ThreadClosure* tc) {
|
|
uintx claim_token = Threads::thread_claim_token();
|
|
ALL_JAVA_THREADS(p) {
|
|
if (p->claim_threads_do(is_par, claim_token)) {
|
|
tc->do_thread(p);
|
|
}
|
|
}
|
|
VMThread* vmt = VMThread::vm_thread();
|
|
if (vmt->claim_threads_do(is_par, claim_token)) {
|
|
tc->do_thread(vmt);
|
|
}
|
|
}
|
|
|
|
// The system initialization in the library has three phases.
|
|
//
|
|
// Phase 1: java.lang.System class initialization
|
|
// java.lang.System is a primordial class loaded and initialized
|
|
// by the VM early during startup. java.lang.System.<clinit>
|
|
// only does registerNatives and keeps the rest of the class
|
|
// initialization work later until thread initialization completes.
|
|
//
|
|
// System.initPhase1 initializes the system properties, the static
|
|
// fields in, out, and err. Set up java signal handlers, OS-specific
|
|
// system settings, and thread group of the main thread.
|
|
static void call_initPhase1(TRAPS) {
|
|
Klass* klass = vmClasses::System_klass();
|
|
JavaValue result(T_VOID);
|
|
JavaCalls::call_static(&result, klass, vmSymbols::initPhase1_name(),
|
|
vmSymbols::void_method_signature(), CHECK);
|
|
}
|
|
|
|
// Phase 2. Module system initialization
|
|
// This will initialize the module system. Only java.base classes
|
|
// can be loaded until phase 2 completes.
|
|
//
|
|
// Call System.initPhase2 after the compiler initialization and jsr292
|
|
// classes get initialized because module initialization runs a lot of java
|
|
// code, that for performance reasons, should be compiled. Also, this will
|
|
// enable the startup code to use lambda and other language features in this
|
|
// phase and onward.
|
|
//
|
|
// After phase 2, The VM will begin search classes from -Xbootclasspath/a.
|
|
static void call_initPhase2(TRAPS) {
|
|
TraceTime timer("Initialize module system", TRACETIME_LOG(Info, startuptime));
|
|
|
|
Klass* klass = vmClasses::System_klass();
|
|
|
|
JavaValue result(T_INT);
|
|
JavaCallArguments args;
|
|
args.push_int(DisplayVMOutputToStderr);
|
|
args.push_int(log_is_enabled(Debug, init)); // print stack trace if exception thrown
|
|
JavaCalls::call_static(&result, klass, vmSymbols::initPhase2_name(),
|
|
vmSymbols::boolean_boolean_int_signature(), &args, CHECK);
|
|
if (result.get_jint() != JNI_OK) {
|
|
vm_exit_during_initialization(); // no message or exception
|
|
}
|
|
|
|
universe_post_module_init();
|
|
}
|
|
|
|
// Phase 3. final setup - set security manager, system class loader and TCCL
|
|
//
|
|
// This will instantiate and set the security manager, set the system class
|
|
// loader as well as the thread context class loader. The security manager
|
|
// and system class loader may be a custom class loaded from -Xbootclasspath/a,
|
|
// other modules or the application's classpath.
|
|
static void call_initPhase3(TRAPS) {
|
|
Klass* klass = vmClasses::System_klass();
|
|
JavaValue result(T_VOID);
|
|
JavaCalls::call_static(&result, klass, vmSymbols::initPhase3_name(),
|
|
vmSymbols::void_method_signature(), CHECK);
|
|
}
|
|
|
|
void Threads::initialize_java_lang_classes(JavaThread* main_thread, TRAPS) {
|
|
TraceTime timer("Initialize java.lang classes", TRACETIME_LOG(Info, startuptime));
|
|
|
|
if (EagerXrunInit && Arguments::init_libraries_at_startup()) {
|
|
create_vm_init_libraries();
|
|
}
|
|
|
|
initialize_class(vmSymbols::java_lang_String(), CHECK);
|
|
|
|
// Inject CompactStrings value after the static initializers for String ran.
|
|
java_lang_String::set_compact_strings(CompactStrings);
|
|
|
|
// Initialize java_lang.System (needed before creating the thread)
|
|
initialize_class(vmSymbols::java_lang_System(), CHECK);
|
|
// The VM creates & returns objects of this class. Make sure it's initialized.
|
|
initialize_class(vmSymbols::java_lang_Class(), CHECK);
|
|
initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK);
|
|
Handle thread_group = create_initial_thread_group(CHECK);
|
|
Universe::set_main_thread_group(thread_group());
|
|
initialize_class(vmSymbols::java_lang_Thread(), CHECK);
|
|
create_initial_thread(thread_group, main_thread, CHECK);
|
|
|
|
// The VM creates objects of this class.
|
|
initialize_class(vmSymbols::java_lang_Module(), CHECK);
|
|
|
|
#ifdef ASSERT
|
|
InstanceKlass *k = vmClasses::UnsafeConstants_klass();
|
|
assert(k->is_not_initialized(), "UnsafeConstants should not already be initialized");
|
|
#endif
|
|
|
|
// initialize the hardware-specific constants needed by Unsafe
|
|
initialize_class(vmSymbols::jdk_internal_misc_UnsafeConstants(), CHECK);
|
|
jdk_internal_misc_UnsafeConstants::set_unsafe_constants();
|
|
|
|
// The VM preresolves methods to these classes. Make sure that they get initialized
|
|
initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK);
|
|
initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK);
|
|
|
|
// Phase 1 of the system initialization in the library, java.lang.System class initialization
|
|
call_initPhase1(CHECK);
|
|
|
|
// Get the Java runtime name, version, and vendor info after java.lang.System is initialized.
|
|
// Some values are actually configure-time constants but some can be set via the jlink tool and
|
|
// so must be read dynamically. We treat them all the same.
|
|
InstanceKlass* ik = SystemDictionary::find_instance_klass(vmSymbols::java_lang_VersionProps(),
|
|
Handle(), Handle());
|
|
{
|
|
ResourceMark rm(main_thread);
|
|
JDK_Version::set_java_version(get_java_version_info(ik, vmSymbols::java_version_name()));
|
|
|
|
JDK_Version::set_runtime_name(get_java_version_info(ik, vmSymbols::java_runtime_name_name()));
|
|
|
|
JDK_Version::set_runtime_version(get_java_version_info(ik, vmSymbols::java_runtime_version_name()));
|
|
|
|
JDK_Version::set_runtime_vendor_version(get_java_version_info(ik, vmSymbols::java_runtime_vendor_version_name()));
|
|
|
|
JDK_Version::set_runtime_vendor_vm_bug_url(get_java_version_info(ik, vmSymbols::java_runtime_vendor_vm_bug_url_name()));
|
|
}
|
|
|
|
// an instance of OutOfMemory exception has been allocated earlier
|
|
initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK);
|
|
initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK);
|
|
initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK);
|
|
initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK);
|
|
initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK);
|
|
initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK);
|
|
initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK);
|
|
initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK);
|
|
}
|
|
|
|
void Threads::initialize_jsr292_core_classes(TRAPS) {
|
|
TraceTime timer("Initialize java.lang.invoke classes", TRACETIME_LOG(Info, startuptime));
|
|
|
|
initialize_class(vmSymbols::java_lang_invoke_MethodHandle(), CHECK);
|
|
initialize_class(vmSymbols::java_lang_invoke_ResolvedMethodName(), CHECK);
|
|
initialize_class(vmSymbols::java_lang_invoke_MemberName(), CHECK);
|
|
initialize_class(vmSymbols::java_lang_invoke_MethodHandleNatives(), CHECK);
|
|
}
|
|
|
|
jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) {
|
|
extern void JDK_Version_init();
|
|
|
|
// Preinitialize version info.
|
|
VM_Version::early_initialize();
|
|
|
|
// Check version
|
|
if (!is_supported_jni_version(args->version)) return JNI_EVERSION;
|
|
|
|
// Initialize library-based TLS
|
|
ThreadLocalStorage::init();
|
|
|
|
// Initialize the output stream module
|
|
ostream_init();
|
|
|
|
// Process java launcher properties.
|
|
Arguments::process_sun_java_launcher_properties(args);
|
|
|
|
// Initialize the os module
|
|
os::init();
|
|
|
|
MACOS_AARCH64_ONLY(os::current_thread_enable_wx(WXWrite));
|
|
|
|
// Record VM creation timing statistics
|
|
TraceVmCreationTime create_vm_timer;
|
|
create_vm_timer.start();
|
|
|
|
// Initialize system properties.
|
|
Arguments::init_system_properties();
|
|
|
|
// So that JDK version can be used as a discriminator when parsing arguments
|
|
JDK_Version_init();
|
|
|
|
// Update/Initialize System properties after JDK version number is known
|
|
Arguments::init_version_specific_system_properties();
|
|
|
|
// Make sure to initialize log configuration *before* parsing arguments
|
|
LogConfiguration::initialize(create_vm_timer.begin_time());
|
|
|
|
// Parse arguments
|
|
// Note: this internally calls os::init_container_support()
|
|
jint parse_result = Arguments::parse(args);
|
|
if (parse_result != JNI_OK) return parse_result;
|
|
|
|
// Initialize NMT right after argument parsing to keep the pre-NMT-init window small.
|
|
MemTracker::initialize();
|
|
|
|
os::init_before_ergo();
|
|
|
|
jint ergo_result = Arguments::apply_ergo();
|
|
if (ergo_result != JNI_OK) return ergo_result;
|
|
|
|
// Final check of all ranges after ergonomics which may change values.
|
|
if (!JVMFlagLimit::check_all_ranges()) {
|
|
return JNI_EINVAL;
|
|
}
|
|
|
|
// Final check of all 'AfterErgo' constraints after ergonomics which may change values.
|
|
bool constraint_result = JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterErgo);
|
|
if (!constraint_result) {
|
|
return JNI_EINVAL;
|
|
}
|
|
|
|
if (PauseAtStartup) {
|
|
os::pause();
|
|
}
|
|
|
|
HOTSPOT_VM_INIT_BEGIN();
|
|
|
|
// Timing (must come after argument parsing)
|
|
TraceTime timer("Create VM", TRACETIME_LOG(Info, startuptime));
|
|
|
|
// Initialize the os module after parsing the args
|
|
jint os_init_2_result = os::init_2();
|
|
if (os_init_2_result != JNI_OK) return os_init_2_result;
|
|
|
|
#ifdef CAN_SHOW_REGISTERS_ON_ASSERT
|
|
// Initialize assert poison page mechanism.
|
|
if (ShowRegistersOnAssert) {
|
|
initialize_assert_poison();
|
|
}
|
|
#endif // CAN_SHOW_REGISTERS_ON_ASSERT
|
|
|
|
SafepointMechanism::initialize();
|
|
|
|
jint adjust_after_os_result = Arguments::adjust_after_os();
|
|
if (adjust_after_os_result != JNI_OK) return adjust_after_os_result;
|
|
|
|
// Initialize output stream logging
|
|
ostream_init_log();
|
|
|
|
// Convert -Xrun to -agentlib: if there is no JVM_OnLoad
|
|
// Must be before create_vm_init_agents()
|
|
if (Arguments::init_libraries_at_startup()) {
|
|
convert_vm_init_libraries_to_agents();
|
|
}
|
|
|
|
// Launch -agentlib/-agentpath and converted -Xrun agents
|
|
if (Arguments::init_agents_at_startup()) {
|
|
create_vm_init_agents();
|
|
}
|
|
|
|
// Initialize Threads state
|
|
_number_of_threads = 0;
|
|
_number_of_non_daemon_threads = 0;
|
|
|
|
// Initialize global data structures and create system classes in heap
|
|
vm_init_globals();
|
|
|
|
#if INCLUDE_JVMCI
|
|
if (JVMCICounterSize > 0) {
|
|
JavaThread::_jvmci_old_thread_counters = NEW_C_HEAP_ARRAY(jlong, JVMCICounterSize, mtJVMCI);
|
|
memset(JavaThread::_jvmci_old_thread_counters, 0, sizeof(jlong) * JVMCICounterSize);
|
|
} else {
|
|
JavaThread::_jvmci_old_thread_counters = NULL;
|
|
}
|
|
#endif // INCLUDE_JVMCI
|
|
|
|
// Initialize OopStorage for threadObj
|
|
_thread_oop_storage = OopStorageSet::create_strong("Thread OopStorage", mtThread);
|
|
|
|
// Attach the main thread to this os thread
|
|
JavaThread* main_thread = new JavaThread();
|
|
main_thread->set_thread_state(_thread_in_vm);
|
|
main_thread->initialize_thread_current();
|
|
// must do this before set_active_handles
|
|
main_thread->record_stack_base_and_size();
|
|
main_thread->register_thread_stack_with_NMT();
|
|
main_thread->set_active_handles(JNIHandleBlock::allocate_block());
|
|
MACOS_AARCH64_ONLY(main_thread->init_wx());
|
|
|
|
if (!main_thread->set_as_starting_thread()) {
|
|
vm_shutdown_during_initialization(
|
|
"Failed necessary internal allocation. Out of swap space");
|
|
main_thread->smr_delete();
|
|
*canTryAgain = false; // don't let caller call JNI_CreateJavaVM again
|
|
return JNI_ENOMEM;
|
|
}
|
|
|
|
// Enable guard page *after* os::create_main_thread(), otherwise it would
|
|
// crash Linux VM, see notes in os_linux.cpp.
|
|
main_thread->stack_overflow_state()->create_stack_guard_pages();
|
|
|
|
// Initialize Java-Level synchronization subsystem
|
|
ObjectMonitor::Initialize();
|
|
ObjectSynchronizer::initialize();
|
|
|
|
// Initialize global modules
|
|
jint status = init_globals();
|
|
if (status != JNI_OK) {
|
|
main_thread->smr_delete();
|
|
*canTryAgain = false; // don't let caller call JNI_CreateJavaVM again
|
|
return status;
|
|
}
|
|
|
|
JFR_ONLY(Jfr::on_create_vm_1();)
|
|
|
|
// Should be done after the heap is fully created
|
|
main_thread->cache_global_variables();
|
|
|
|
{ MutexLocker mu(Threads_lock);
|
|
Threads::add(main_thread);
|
|
}
|
|
|
|
// Any JVMTI raw monitors entered in onload will transition into
|
|
// real raw monitor. VM is setup enough here for raw monitor enter.
|
|
JvmtiExport::transition_pending_onload_raw_monitors();
|
|
|
|
// Create the VMThread
|
|
{ TraceTime timer("Start VMThread", TRACETIME_LOG(Info, startuptime));
|
|
|
|
VMThread::create();
|
|
VMThread* vmthread = VMThread::vm_thread();
|
|
|
|
if (!os::create_thread(vmthread, os::vm_thread)) {
|
|
vm_exit_during_initialization("Cannot create VM thread. "
|
|
"Out of system resources.");
|
|
}
|
|
|
|
// Wait for the VM thread to become ready, and VMThread::run to initialize
|
|
// Monitors can have spurious returns, must always check another state flag
|
|
{
|
|
MonitorLocker ml(Notify_lock);
|
|
os::start_thread(vmthread);
|
|
while (!vmthread->is_running()) {
|
|
ml.wait();
|
|
}
|
|
}
|
|
}
|
|
|
|
assert(Universe::is_fully_initialized(), "not initialized");
|
|
if (VerifyDuringStartup) {
|
|
// Make sure we're starting with a clean slate.
|
|
VM_Verify verify_op;
|
|
VMThread::execute(&verify_op);
|
|
}
|
|
|
|
// We need this to update the java.vm.info property in case any flags used
|
|
// to initially define it have been changed. This is needed for both CDS
|
|
// since UseSharedSpaces may be changed after java.vm.info
|
|
// is initially computed. See Abstract_VM_Version::vm_info_string().
|
|
// This update must happen before we initialize the java classes, but
|
|
// after any initialization logic that might modify the flags.
|
|
Arguments::update_vm_info_property(VM_Version::vm_info_string());
|
|
|
|
JavaThread* THREAD = JavaThread::current(); // For exception macros.
|
|
HandleMark hm(THREAD);
|
|
|
|
// Always call even when there are not JVMTI environments yet, since environments
|
|
// may be attached late and JVMTI must track phases of VM execution
|
|
JvmtiExport::enter_early_start_phase();
|
|
|
|
// Notify JVMTI agents that VM has started (JNI is up) - nop if no agents.
|
|
JvmtiExport::post_early_vm_start();
|
|
|
|
initialize_java_lang_classes(main_thread, CHECK_JNI_ERR);
|
|
|
|
quicken_jni_functions();
|
|
|
|
// No more stub generation allowed after that point.
|
|
StubCodeDesc::freeze();
|
|
|
|
// Set flag that basic initialization has completed. Used by exceptions and various
|
|
// debug stuff, that does not work until all basic classes have been initialized.
|
|
set_init_completed();
|
|
|
|
LogConfiguration::post_initialize();
|
|
Metaspace::post_initialize();
|
|
|
|
HOTSPOT_VM_INIT_END();
|
|
|
|
// record VM initialization completion time
|
|
#if INCLUDE_MANAGEMENT
|
|
Management::record_vm_init_completed();
|
|
#endif // INCLUDE_MANAGEMENT
|
|
|
|
// Signal Dispatcher needs to be started before VMInit event is posted
|
|
os::initialize_jdk_signal_support(CHECK_JNI_ERR);
|
|
|
|
// Start Attach Listener if +StartAttachListener or it can't be started lazily
|
|
if (!DisableAttachMechanism) {
|
|
AttachListener::vm_start();
|
|
if (StartAttachListener || AttachListener::init_at_startup()) {
|
|
AttachListener::init();
|
|
}
|
|
}
|
|
|
|
// Launch -Xrun agents
|
|
// Must be done in the JVMTI live phase so that for backward compatibility the JDWP
|
|
// back-end can launch with -Xdebug -Xrunjdwp.
|
|
if (!EagerXrunInit && Arguments::init_libraries_at_startup()) {
|
|
create_vm_init_libraries();
|
|
}
|
|
|
|
Chunk::start_chunk_pool_cleaner_task();
|
|
|
|
// Start the service thread
|
|
// The service thread enqueues JVMTI deferred events and does various hashtable
|
|
// and other cleanups. Needs to start before the compilers start posting events.
|
|
ServiceThread::initialize();
|
|
|
|
// Start the monitor deflation thread:
|
|
MonitorDeflationThread::initialize();
|
|
|
|
// initialize compiler(s)
|
|
#if defined(COMPILER1) || COMPILER2_OR_JVMCI
|
|
#if INCLUDE_JVMCI
|
|
bool force_JVMCI_intialization = false;
|
|
if (EnableJVMCI) {
|
|
// Initialize JVMCI eagerly when it is explicitly requested.
|
|
// Or when JVMCILibDumpJNIConfig or JVMCIPrintProperties is enabled.
|
|
force_JVMCI_intialization = EagerJVMCI || JVMCIPrintProperties || JVMCILibDumpJNIConfig;
|
|
|
|
if (!force_JVMCI_intialization) {
|
|
// 8145270: Force initialization of JVMCI runtime otherwise requests for blocking
|
|
// compilations via JVMCI will not actually block until JVMCI is initialized.
|
|
force_JVMCI_intialization = UseJVMCICompiler && (!UseInterpreter || !BackgroundCompilation);
|
|
}
|
|
}
|
|
#endif
|
|
CompileBroker::compilation_init_phase1(CHECK_JNI_ERR);
|
|
// Postpone completion of compiler initialization to after JVMCI
|
|
// is initialized to avoid timeouts of blocking compilations.
|
|
if (JVMCI_ONLY(!force_JVMCI_intialization) NOT_JVMCI(true)) {
|
|
CompileBroker::compilation_init_phase2();
|
|
}
|
|
#endif
|
|
|
|
// Pre-initialize some JSR292 core classes to avoid deadlock during class loading.
|
|
// It is done after compilers are initialized, because otherwise compilations of
|
|
// signature polymorphic MH intrinsics can be missed
|
|
// (see SystemDictionary::find_method_handle_intrinsic).
|
|
initialize_jsr292_core_classes(CHECK_JNI_ERR);
|
|
|
|
// This will initialize the module system. Only java.base classes can be
|
|
// loaded until phase 2 completes
|
|
call_initPhase2(CHECK_JNI_ERR);
|
|
|
|
JFR_ONLY(Jfr::on_create_vm_2();)
|
|
|
|
// Always call even when there are not JVMTI environments yet, since environments
|
|
// may be attached late and JVMTI must track phases of VM execution
|
|
JvmtiExport::enter_start_phase();
|
|
|
|
// Notify JVMTI agents that VM has started (JNI is up) - nop if no agents.
|
|
JvmtiExport::post_vm_start();
|
|
|
|
// Final system initialization including security manager and system class loader
|
|
call_initPhase3(CHECK_JNI_ERR);
|
|
|
|
// cache the system and platform class loaders
|
|
SystemDictionary::compute_java_loaders(CHECK_JNI_ERR);
|
|
|
|
#if INCLUDE_CDS
|
|
// capture the module path info from the ModuleEntryTable
|
|
ClassLoader::initialize_module_path(THREAD);
|
|
if (HAS_PENDING_EXCEPTION) {
|
|
java_lang_Throwable::print(PENDING_EXCEPTION, tty);
|
|
vm_exit_during_initialization("ClassLoader::initialize_module_path() failed unexpectedly");
|
|
}
|
|
#endif
|
|
|
|
#if INCLUDE_JVMCI
|
|
if (force_JVMCI_intialization) {
|
|
JVMCI::initialize_compiler(CHECK_JNI_ERR);
|
|
CompileBroker::compilation_init_phase2();
|
|
}
|
|
#endif
|
|
|
|
// Always call even when there are not JVMTI environments yet, since environments
|
|
// may be attached late and JVMTI must track phases of VM execution
|
|
JvmtiExport::enter_live_phase();
|
|
|
|
// Make perfmemory accessible
|
|
PerfMemory::set_accessible(true);
|
|
|
|
// Notify JVMTI agents that VM initialization is complete - nop if no agents.
|
|
JvmtiExport::post_vm_initialized();
|
|
|
|
JFR_ONLY(Jfr::on_create_vm_3();)
|
|
|
|
#if INCLUDE_MANAGEMENT
|
|
Management::initialize(THREAD);
|
|
|
|
if (HAS_PENDING_EXCEPTION) {
|
|
// management agent fails to start possibly due to
|
|
// configuration problem and is responsible for printing
|
|
// stack trace if appropriate. Simply exit VM.
|
|
vm_exit(1);
|
|
}
|
|
#endif // INCLUDE_MANAGEMENT
|
|
|
|
StatSampler::engage();
|
|
if (CheckJNICalls) JniPeriodicChecker::engage();
|
|
|
|
#if INCLUDE_RTM_OPT
|
|
RTMLockingCounters::init();
|
|
#endif
|
|
|
|
call_postVMInitHook(THREAD);
|
|
// The Java side of PostVMInitHook.run must deal with all
|
|
// exceptions and provide means of diagnosis.
|
|
if (HAS_PENDING_EXCEPTION) {
|
|
CLEAR_PENDING_EXCEPTION;
|
|
}
|
|
|
|
{
|
|
MutexLocker ml(PeriodicTask_lock);
|
|
// Make sure the WatcherThread can be started by WatcherThread::start()
|
|
// or by dynamic enrollment.
|
|
WatcherThread::make_startable();
|
|
// Start up the WatcherThread if there are any periodic tasks
|
|
// NOTE: All PeriodicTasks should be registered by now. If they
|
|
// aren't, late joiners might appear to start slowly (we might
|
|
// take a while to process their first tick).
|
|
if (PeriodicTask::num_tasks() > 0) {
|
|
WatcherThread::start();
|
|
}
|
|
}
|
|
|
|
create_vm_timer.end();
|
|
#ifdef ASSERT
|
|
_vm_complete = true;
|
|
#endif
|
|
|
|
if (DumpSharedSpaces) {
|
|
MetaspaceShared::preload_and_dump();
|
|
ShouldNotReachHere();
|
|
}
|
|
|
|
return JNI_OK;
|
|
}
|
|
|
|
// type for the Agent_OnLoad and JVM_OnLoad entry points
|
|
extern "C" {
|
|
typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *);
|
|
}
|
|
// Find a command line agent library and return its entry point for
|
|
// -agentlib: -agentpath: -Xrun
|
|
// num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array.
|
|
static OnLoadEntry_t lookup_on_load(AgentLibrary* agent,
|
|
const char *on_load_symbols[],
|
|
size_t num_symbol_entries) {
|
|
OnLoadEntry_t on_load_entry = NULL;
|
|
void *library = NULL;
|
|
|
|
if (!agent->valid()) {
|
|
char buffer[JVM_MAXPATHLEN];
|
|
char ebuf[1024] = "";
|
|
const char *name = agent->name();
|
|
const char *msg = "Could not find agent library ";
|
|
|
|
// First check to see if agent is statically linked into executable
|
|
if (os::find_builtin_agent(agent, on_load_symbols, num_symbol_entries)) {
|
|
library = agent->os_lib();
|
|
} else if (agent->is_absolute_path()) {
|
|
library = os::dll_load(name, ebuf, sizeof ebuf);
|
|
if (library == NULL) {
|
|
const char *sub_msg = " in absolute path, with error: ";
|
|
size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1;
|
|
char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread);
|
|
jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf);
|
|
// If we can't find the agent, exit.
|
|
vm_exit_during_initialization(buf, NULL);
|
|
FREE_C_HEAP_ARRAY(char, buf);
|
|
}
|
|
} else {
|
|
// Try to load the agent from the standard dll directory
|
|
if (os::dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(),
|
|
name)) {
|
|
library = os::dll_load(buffer, ebuf, sizeof ebuf);
|
|
}
|
|
if (library == NULL) { // Try the library path directory.
|
|
if (os::dll_build_name(buffer, sizeof(buffer), name)) {
|
|
library = os::dll_load(buffer, ebuf, sizeof ebuf);
|
|
}
|
|
if (library == NULL) {
|
|
const char *sub_msg = " on the library path, with error: ";
|
|
const char *sub_msg2 = "\nModule java.instrument may be missing from runtime image.";
|
|
|
|
size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) +
|
|
strlen(ebuf) + strlen(sub_msg2) + 1;
|
|
char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread);
|
|
if (!agent->is_instrument_lib()) {
|
|
jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf);
|
|
} else {
|
|
jio_snprintf(buf, len, "%s%s%s%s%s", msg, name, sub_msg, ebuf, sub_msg2);
|
|
}
|
|
// If we can't find the agent, exit.
|
|
vm_exit_during_initialization(buf, NULL);
|
|
FREE_C_HEAP_ARRAY(char, buf);
|
|
}
|
|
}
|
|
}
|
|
agent->set_os_lib(library);
|
|
agent->set_valid();
|
|
}
|
|
|
|
// Find the OnLoad function.
|
|
on_load_entry =
|
|
CAST_TO_FN_PTR(OnLoadEntry_t, os::find_agent_function(agent,
|
|
false,
|
|
on_load_symbols,
|
|
num_symbol_entries));
|
|
return on_load_entry;
|
|
}
|
|
|
|
// Find the JVM_OnLoad entry point
|
|
static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) {
|
|
const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS;
|
|
return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*));
|
|
}
|
|
|
|
// Find the Agent_OnLoad entry point
|
|
static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) {
|
|
const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS;
|
|
return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*));
|
|
}
|
|
|
|
// For backwards compatibility with -Xrun
|
|
// Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be
|
|
// treated like -agentpath:
|
|
// Must be called before agent libraries are created
|
|
void Threads::convert_vm_init_libraries_to_agents() {
|
|
AgentLibrary* agent;
|
|
AgentLibrary* next;
|
|
|
|
for (agent = Arguments::libraries(); agent != NULL; agent = next) {
|
|
next = agent->next(); // cache the next agent now as this agent may get moved off this list
|
|
OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent);
|
|
|
|
// If there is an JVM_OnLoad function it will get called later,
|
|
// otherwise see if there is an Agent_OnLoad
|
|
if (on_load_entry == NULL) {
|
|
on_load_entry = lookup_agent_on_load(agent);
|
|
if (on_load_entry != NULL) {
|
|
// switch it to the agent list -- so that Agent_OnLoad will be called,
|
|
// JVM_OnLoad won't be attempted and Agent_OnUnload will
|
|
Arguments::convert_library_to_agent(agent);
|
|
} else {
|
|
vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Create agents for -agentlib: -agentpath: and converted -Xrun
|
|
// Invokes Agent_OnLoad
|
|
// Called very early -- before JavaThreads exist
|
|
void Threads::create_vm_init_agents() {
|
|
extern struct JavaVM_ main_vm;
|
|
AgentLibrary* agent;
|
|
|
|
JvmtiExport::enter_onload_phase();
|
|
|
|
for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) {
|
|
// CDS dumping does not support native JVMTI agent.
|
|
// CDS dumping supports Java agent if the AllowArchivingWithJavaAgent diagnostic option is specified.
|
|
if (Arguments::is_dumping_archive()) {
|
|
if(!agent->is_instrument_lib()) {
|
|
vm_exit_during_cds_dumping("CDS dumping does not support native JVMTI agent, name", agent->name());
|
|
} else if (!AllowArchivingWithJavaAgent) {
|
|
vm_exit_during_cds_dumping(
|
|
"Must enable AllowArchivingWithJavaAgent in order to run Java agent during CDS dumping");
|
|
}
|
|
}
|
|
|
|
OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent);
|
|
|
|
if (on_load_entry != NULL) {
|
|
// Invoke the Agent_OnLoad function
|
|
jint err = (*on_load_entry)(&main_vm, agent->options(), NULL);
|
|
if (err != JNI_OK) {
|
|
vm_exit_during_initialization("agent library failed to init", agent->name());
|
|
}
|
|
} else {
|
|
vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name());
|
|
}
|
|
}
|
|
|
|
JvmtiExport::enter_primordial_phase();
|
|
}
|
|
|
|
extern "C" {
|
|
typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *);
|
|
}
|
|
|
|
void Threads::shutdown_vm_agents() {
|
|
// Send any Agent_OnUnload notifications
|
|
const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS;
|
|
size_t num_symbol_entries = ARRAY_SIZE(on_unload_symbols);
|
|
extern struct JavaVM_ main_vm;
|
|
for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) {
|
|
|
|
// Find the Agent_OnUnload function.
|
|
Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t,
|
|
os::find_agent_function(agent,
|
|
false,
|
|
on_unload_symbols,
|
|
num_symbol_entries));
|
|
|
|
// Invoke the Agent_OnUnload function
|
|
if (unload_entry != NULL) {
|
|
JavaThread* thread = JavaThread::current();
|
|
ThreadToNativeFromVM ttn(thread);
|
|
HandleMark hm(thread);
|
|
(*unload_entry)(&main_vm);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries
|
|
// Invokes JVM_OnLoad
|
|
void Threads::create_vm_init_libraries() {
|
|
extern struct JavaVM_ main_vm;
|
|
AgentLibrary* agent;
|
|
|
|
for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) {
|
|
OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent);
|
|
|
|
if (on_load_entry != NULL) {
|
|
// Invoke the JVM_OnLoad function
|
|
JavaThread* thread = JavaThread::current();
|
|
ThreadToNativeFromVM ttn(thread);
|
|
HandleMark hm(thread);
|
|
jint err = (*on_load_entry)(&main_vm, agent->options(), NULL);
|
|
if (err != JNI_OK) {
|
|
vm_exit_during_initialization("-Xrun library failed to init", agent->name());
|
|
}
|
|
} else {
|
|
vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name());
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// Last thread running calls java.lang.Shutdown.shutdown()
|
|
void JavaThread::invoke_shutdown_hooks() {
|
|
HandleMark hm(this);
|
|
|
|
// We could get here with a pending exception, if so clear it now or
|
|
// it will cause MetaspaceShared::link_shared_classes to
|
|
// fail for dynamic dump.
|
|
if (this->has_pending_exception()) {
|
|
this->clear_pending_exception();
|
|
}
|
|
|
|
#if INCLUDE_CDS
|
|
// Link all classes for dynamic CDS dumping before vm exit.
|
|
// Same operation is being done in JVM_BeforeHalt for handling the
|
|
// case where the application calls System.exit().
|
|
if (DynamicArchive::should_dump_at_vm_exit()) {
|
|
DynamicArchive::prepare_for_dump_at_exit();
|
|
}
|
|
#endif
|
|
|
|
EXCEPTION_MARK;
|
|
Klass* shutdown_klass =
|
|
SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(),
|
|
THREAD);
|
|
if (shutdown_klass != NULL) {
|
|
// SystemDictionary::resolve_or_null will return null if there was
|
|
// an exception. If we cannot load the Shutdown class, just don't
|
|
// call Shutdown.shutdown() at all. This will mean the shutdown hooks
|
|
// won't be run. Note that if a shutdown hook was registered,
|
|
// the Shutdown class would have already been loaded
|
|
// (Runtime.addShutdownHook will load it).
|
|
JavaValue result(T_VOID);
|
|
JavaCalls::call_static(&result,
|
|
shutdown_klass,
|
|
vmSymbols::shutdown_name(),
|
|
vmSymbols::void_method_signature(),
|
|
THREAD);
|
|
}
|
|
CLEAR_PENDING_EXCEPTION;
|
|
}
|
|
|
|
// Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when
|
|
// the program falls off the end of main(). Another VM exit path is through
|
|
// vm_exit() when the program calls System.exit() to return a value or when
|
|
// there is a serious error in VM. The two shutdown paths are not exactly
|
|
// the same, but they share Shutdown.shutdown() at Java level and before_exit()
|
|
// and VM_Exit op at VM level.
|
|
//
|
|
// Shutdown sequence:
|
|
// + Shutdown native memory tracking if it is on
|
|
// + Wait until we are the last non-daemon thread to execute
|
|
// <-- every thing is still working at this moment -->
|
|
// + Call java.lang.Shutdown.shutdown(), which will invoke Java level
|
|
// shutdown hooks
|
|
// + Call before_exit(), prepare for VM exit
|
|
// > run VM level shutdown hooks (they are registered through JVM_OnExit(),
|
|
// currently the only user of this mechanism is File.deleteOnExit())
|
|
// > stop StatSampler, watcher thread,
|
|
// post thread end and vm death events to JVMTI,
|
|
// stop signal thread
|
|
// + Call JavaThread::exit(), it will:
|
|
// > release JNI handle blocks, remove stack guard pages
|
|
// > remove this thread from Threads list
|
|
// <-- no more Java code from this thread after this point -->
|
|
// + Stop VM thread, it will bring the remaining VM to a safepoint and stop
|
|
// the compiler threads at safepoint
|
|
// <-- do not use anything that could get blocked by Safepoint -->
|
|
// + Disable tracing at JNI/JVM barriers
|
|
// + Set _vm_exited flag for threads that are still running native code
|
|
// + Call exit_globals()
|
|
// > deletes tty
|
|
// > deletes PerfMemory resources
|
|
// + Delete this thread
|
|
// + Return to caller
|
|
|
|
void Threads::destroy_vm() {
|
|
JavaThread* thread = JavaThread::current();
|
|
|
|
#ifdef ASSERT
|
|
_vm_complete = false;
|
|
#endif
|
|
// Wait until we are the last non-daemon thread to execute
|
|
{
|
|
MonitorLocker nu(Threads_lock);
|
|
while (Threads::number_of_non_daemon_threads() > 1)
|
|
// This wait should make safepoint checks, wait without a timeout.
|
|
nu.wait(0);
|
|
}
|
|
|
|
EventShutdown e;
|
|
if (e.should_commit()) {
|
|
e.set_reason("No remaining non-daemon Java threads");
|
|
e.commit();
|
|
}
|
|
|
|
// Hang forever on exit if we are reporting an error.
|
|
if (ShowMessageBoxOnError && VMError::is_error_reported()) {
|
|
os::infinite_sleep();
|
|
}
|
|
os::wait_for_keypress_at_exit();
|
|
|
|
// run Java level shutdown hooks
|
|
thread->invoke_shutdown_hooks();
|
|
|
|
before_exit(thread);
|
|
|
|
thread->exit(true);
|
|
|
|
// We are no longer on the main thread list but could still be in a
|
|
// secondary list where another thread may try to interact with us.
|
|
// So wait until all such interactions are complete before we bring
|
|
// the VM to the termination safepoint. Normally this would be done
|
|
// using thread->smr_delete() below where we delete the thread, but
|
|
// we can't call that after the termination safepoint is active as
|
|
// we will deadlock on the Threads_lock. Once all interactions are
|
|
// complete it is safe to directly delete the thread at any time.
|
|
ThreadsSMRSupport::wait_until_not_protected(thread);
|
|
|
|
// Stop VM thread.
|
|
{
|
|
// 4945125 The vm thread comes to a safepoint during exit.
|
|
// GC vm_operations can get caught at the safepoint, and the
|
|
// heap is unparseable if they are caught. Grab the Heap_lock
|
|
// to prevent this. The GC vm_operations will not be able to
|
|
// queue until after the vm thread is dead. After this point,
|
|
// we'll never emerge out of the safepoint before the VM exits.
|
|
// Assert that the thread is terminated so that acquiring the
|
|
// Heap_lock doesn't cause the terminated thread to participate in
|
|
// the safepoint protocol.
|
|
|
|
assert(thread->is_terminated(), "must be terminated here");
|
|
MutexLocker ml(Heap_lock);
|
|
|
|
VMThread::wait_for_vm_thread_exit();
|
|
assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint");
|
|
VMThread::destroy();
|
|
}
|
|
|
|
// Now, all Java threads are gone except daemon threads. Daemon threads
|
|
// running Java code or in VM are stopped by the Safepoint. However,
|
|
// daemon threads executing native code are still running. But they
|
|
// will be stopped at native=>Java/VM barriers. Note that we can't
|
|
// simply kill or suspend them, as it is inherently deadlock-prone.
|
|
|
|
VM_Exit::set_vm_exited();
|
|
|
|
// Clean up ideal graph printers after the VMThread has started
|
|
// the final safepoint which will block all the Compiler threads.
|
|
// Note that this Thread has already logically exited so the
|
|
// clean_up() function's use of a JavaThreadIteratorWithHandle
|
|
// would be a problem except set_vm_exited() has remembered the
|
|
// shutdown thread which is granted a policy exception.
|
|
#if defined(COMPILER2) && !defined(PRODUCT)
|
|
IdealGraphPrinter::clean_up();
|
|
#endif
|
|
|
|
notify_vm_shutdown();
|
|
|
|
// exit_globals() will delete tty
|
|
exit_globals();
|
|
|
|
// Deleting the shutdown thread here is safe. See comment on
|
|
// wait_until_not_protected() above.
|
|
delete thread;
|
|
|
|
#if INCLUDE_JVMCI
|
|
if (JVMCICounterSize > 0) {
|
|
FREE_C_HEAP_ARRAY(jlong, JavaThread::_jvmci_old_thread_counters);
|
|
}
|
|
#endif
|
|
|
|
LogConfiguration::finalize();
|
|
}
|
|
|
|
|
|
jboolean Threads::is_supported_jni_version_including_1_1(jint version) {
|
|
if (version == JNI_VERSION_1_1) return JNI_TRUE;
|
|
return is_supported_jni_version(version);
|
|
}
|
|
|
|
|
|
jboolean Threads::is_supported_jni_version(jint version) {
|
|
if (version == JNI_VERSION_1_2) return JNI_TRUE;
|
|
if (version == JNI_VERSION_1_4) return JNI_TRUE;
|
|
if (version == JNI_VERSION_1_6) return JNI_TRUE;
|
|
if (version == JNI_VERSION_1_8) return JNI_TRUE;
|
|
if (version == JNI_VERSION_9) return JNI_TRUE;
|
|
if (version == JNI_VERSION_10) return JNI_TRUE;
|
|
return JNI_FALSE;
|
|
}
|
|
|
|
|
|
void Threads::add(JavaThread* p, bool force_daemon) {
|
|
// The threads lock must be owned at this point
|
|
assert(Threads_lock->owned_by_self(), "must have threads lock");
|
|
|
|
BarrierSet::barrier_set()->on_thread_attach(p);
|
|
|
|
// Once a JavaThread is added to the Threads list, smr_delete() has
|
|
// to be used to delete it. Otherwise we can just delete it directly.
|
|
p->set_on_thread_list();
|
|
|
|
_number_of_threads++;
|
|
oop threadObj = p->threadObj();
|
|
bool daemon = true;
|
|
// Bootstrapping problem: threadObj can be null for initial
|
|
// JavaThread (or for threads attached via JNI)
|
|
if ((!force_daemon) && !is_daemon((threadObj))) {
|
|
_number_of_non_daemon_threads++;
|
|
daemon = false;
|
|
}
|
|
|
|
ThreadService::add_thread(p, daemon);
|
|
|
|
// Maintain fast thread list
|
|
ThreadsSMRSupport::add_thread(p);
|
|
|
|
// Increase the ObjectMonitor ceiling for the new thread.
|
|
ObjectSynchronizer::inc_in_use_list_ceiling();
|
|
|
|
// Possible GC point.
|
|
Events::log(p, "Thread added: " INTPTR_FORMAT, p2i(p));
|
|
|
|
// Make new thread known to active EscapeBarrier
|
|
EscapeBarrier::thread_added(p);
|
|
}
|
|
|
|
void Threads::remove(JavaThread* p, bool is_daemon) {
|
|
// Extra scope needed for Thread_lock, so we can check
|
|
// that we do not remove thread without safepoint code notice
|
|
{ MonitorLocker ml(Threads_lock);
|
|
|
|
// BarrierSet state must be destroyed after the last thread transition
|
|
// before the thread terminates. Thread transitions result in calls to
|
|
// StackWatermarkSet::on_safepoint(), which performs GC processing,
|
|
// requiring the GC state to be alive.
|
|
BarrierSet::barrier_set()->on_thread_detach(p);
|
|
|
|
assert(ThreadsSMRSupport::get_java_thread_list()->includes(p), "p must be present");
|
|
|
|
// Maintain fast thread list
|
|
ThreadsSMRSupport::remove_thread(p);
|
|
|
|
_number_of_threads--;
|
|
if (!is_daemon) {
|
|
_number_of_non_daemon_threads--;
|
|
|
|
// Only one thread left, do a notify on the Threads_lock so a thread waiting
|
|
// on destroy_vm will wake up.
|
|
if (number_of_non_daemon_threads() == 1) {
|
|
ml.notify_all();
|
|
}
|
|
}
|
|
ThreadService::remove_thread(p, is_daemon);
|
|
|
|
// Make sure that safepoint code disregard this thread. This is needed since
|
|
// the thread might mess around with locks after this point. This can cause it
|
|
// to do callbacks into the safepoint code. However, the safepoint code is not aware
|
|
// of this thread since it is removed from the queue.
|
|
p->set_terminated(JavaThread::_thread_terminated);
|
|
|
|
// Notify threads waiting in EscapeBarriers
|
|
EscapeBarrier::thread_removed(p);
|
|
} // unlock Threads_lock
|
|
|
|
// Reduce the ObjectMonitor ceiling for the exiting thread.
|
|
ObjectSynchronizer::dec_in_use_list_ceiling();
|
|
|
|
// Since Events::log uses a lock, we grab it outside the Threads_lock
|
|
Events::log(p, "Thread exited: " INTPTR_FORMAT, p2i(p));
|
|
}
|
|
|
|
// Operations on the Threads list for GC. These are not explicitly locked,
|
|
// but the garbage collector must provide a safe context for them to run.
|
|
// In particular, these things should never be called when the Threads_lock
|
|
// is held by some other thread. (Note: the Safepoint abstraction also
|
|
// uses the Threads_lock to guarantee this property. It also makes sure that
|
|
// all threads gets blocked when exiting or starting).
|
|
|
|
void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) {
|
|
ALL_JAVA_THREADS(p) {
|
|
p->oops_do(f, cf);
|
|
}
|
|
VMThread::vm_thread()->oops_do(f, cf);
|
|
}
|
|
|
|
void Threads::change_thread_claim_token() {
|
|
if (++_thread_claim_token == 0) {
|
|
// On overflow of the token counter, there is a risk of future
|
|
// collisions between a new global token value and a stale token
|
|
// for a thread, because not all iterations visit all threads.
|
|
// (Though it's pretty much a theoretical concern for non-trivial
|
|
// token counter sizes.) To deal with the possibility, reset all
|
|
// the thread tokens to zero on global token overflow.
|
|
struct ResetClaims : public ThreadClosure {
|
|
virtual void do_thread(Thread* t) {
|
|
t->claim_threads_do(false, 0);
|
|
}
|
|
} reset_claims;
|
|
Threads::threads_do(&reset_claims);
|
|
// On overflow, update the global token to non-zero, to
|
|
// avoid the special "never claimed" initial thread value.
|
|
_thread_claim_token = 1;
|
|
}
|
|
}
|
|
|
|
#ifdef ASSERT
|
|
void assert_thread_claimed(const char* kind, Thread* t, uintx expected) {
|
|
const uintx token = t->threads_do_token();
|
|
assert(token == expected,
|
|
"%s " PTR_FORMAT " has incorrect value " UINTX_FORMAT " != "
|
|
UINTX_FORMAT, kind, p2i(t), token, expected);
|
|
}
|
|
|
|
void Threads::assert_all_threads_claimed() {
|
|
ALL_JAVA_THREADS(p) {
|
|
assert_thread_claimed("Thread", p, _thread_claim_token);
|
|
}
|
|
assert_thread_claimed("VMThread", VMThread::vm_thread(), _thread_claim_token);
|
|
}
|
|
#endif // ASSERT
|
|
|
|
class ParallelOopsDoThreadClosure : public ThreadClosure {
|
|
private:
|
|
OopClosure* _f;
|
|
CodeBlobClosure* _cf;
|
|
public:
|
|
ParallelOopsDoThreadClosure(OopClosure* f, CodeBlobClosure* cf) : _f(f), _cf(cf) {}
|
|
void do_thread(Thread* t) {
|
|
t->oops_do(_f, _cf);
|
|
}
|
|
};
|
|
|
|
void Threads::possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf) {
|
|
ParallelOopsDoThreadClosure tc(f, cf);
|
|
possibly_parallel_threads_do(is_par, &tc);
|
|
}
|
|
|
|
void Threads::metadata_do(MetadataClosure* f) {
|
|
ALL_JAVA_THREADS(p) {
|
|
p->metadata_do(f);
|
|
}
|
|
}
|
|
|
|
class ThreadHandlesClosure : public ThreadClosure {
|
|
void (*_f)(Metadata*);
|
|
public:
|
|
ThreadHandlesClosure(void f(Metadata*)) : _f(f) {}
|
|
virtual void do_thread(Thread* thread) {
|
|
thread->metadata_handles_do(_f);
|
|
}
|
|
};
|
|
|
|
void Threads::metadata_handles_do(void f(Metadata*)) {
|
|
// Only walk the Handles in Thread.
|
|
ThreadHandlesClosure handles_closure(f);
|
|
threads_do(&handles_closure);
|
|
}
|
|
|
|
// Get count Java threads that are waiting to enter the specified monitor.
|
|
GrowableArray<JavaThread*>* Threads::get_pending_threads(ThreadsList * t_list,
|
|
int count,
|
|
address monitor) {
|
|
GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count);
|
|
|
|
int i = 0;
|
|
for (JavaThread* p : *t_list) {
|
|
if (!p->can_call_java()) continue;
|
|
|
|
// The first stage of async deflation does not affect any field
|
|
// used by this comparison so the ObjectMonitor* is usable here.
|
|
address pending = (address)p->current_pending_monitor();
|
|
if (pending == monitor) { // found a match
|
|
if (i < count) result->append(p); // save the first count matches
|
|
i++;
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
JavaThread *Threads::owning_thread_from_monitor_owner(ThreadsList * t_list,
|
|
address owner) {
|
|
// NULL owner means not locked so we can skip the search
|
|
if (owner == NULL) return NULL;
|
|
|
|
for (JavaThread* p : *t_list) {
|
|
// first, see if owner is the address of a Java thread
|
|
if (owner == (address)p) return p;
|
|
}
|
|
|
|
// Cannot assert on lack of success here since this function may be
|
|
// used by code that is trying to report useful problem information
|
|
// like deadlock detection.
|
|
if (UseHeavyMonitors) return NULL;
|
|
|
|
// If we didn't find a matching Java thread and we didn't force use of
|
|
// heavyweight monitors, then the owner is the stack address of the
|
|
// Lock Word in the owning Java thread's stack.
|
|
//
|
|
JavaThread* the_owner = NULL;
|
|
for (JavaThread* q : *t_list) {
|
|
if (q->is_lock_owned(owner)) {
|
|
the_owner = q;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// cannot assert on lack of success here; see above comment
|
|
return the_owner;
|
|
}
|
|
|
|
class PrintOnClosure : public ThreadClosure {
|
|
private:
|
|
outputStream* _st;
|
|
|
|
public:
|
|
PrintOnClosure(outputStream* st) :
|
|
_st(st) {}
|
|
|
|
virtual void do_thread(Thread* thread) {
|
|
if (thread != NULL) {
|
|
thread->print_on(_st);
|
|
_st->cr();
|
|
}
|
|
}
|
|
};
|
|
|
|
// Threads::print_on() is called at safepoint by VM_PrintThreads operation.
|
|
void Threads::print_on(outputStream* st, bool print_stacks,
|
|
bool internal_format, bool print_concurrent_locks,
|
|
bool print_extended_info) {
|
|
char buf[32];
|
|
st->print_raw_cr(os::local_time_string(buf, sizeof(buf)));
|
|
|
|
st->print_cr("Full thread dump %s (%s %s):",
|
|
VM_Version::vm_name(),
|
|
VM_Version::vm_release(),
|
|
VM_Version::vm_info_string());
|
|
st->cr();
|
|
|
|
#if INCLUDE_SERVICES
|
|
// Dump concurrent locks
|
|
ConcurrentLocksDump concurrent_locks;
|
|
if (print_concurrent_locks) {
|
|
concurrent_locks.dump_at_safepoint();
|
|
}
|
|
#endif // INCLUDE_SERVICES
|
|
|
|
ThreadsSMRSupport::print_info_on(st);
|
|
st->cr();
|
|
|
|
ALL_JAVA_THREADS(p) {
|
|
ResourceMark rm;
|
|
p->print_on(st, print_extended_info);
|
|
if (print_stacks) {
|
|
if (internal_format) {
|
|
p->trace_stack();
|
|
} else {
|
|
p->print_stack_on(st);
|
|
}
|
|
}
|
|
st->cr();
|
|
#if INCLUDE_SERVICES
|
|
if (print_concurrent_locks) {
|
|
concurrent_locks.print_locks_on(p, st);
|
|
}
|
|
#endif // INCLUDE_SERVICES
|
|
}
|
|
|
|
PrintOnClosure cl(st);
|
|
cl.do_thread(VMThread::vm_thread());
|
|
Universe::heap()->gc_threads_do(&cl);
|
|
if (StringDedup::is_enabled()) {
|
|
StringDedup::threads_do(&cl);
|
|
}
|
|
cl.do_thread(WatcherThread::watcher_thread());
|
|
cl.do_thread(AsyncLogWriter::instance());
|
|
|
|
st->flush();
|
|
}
|
|
|
|
void Threads::print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf,
|
|
int buflen, bool* found_current) {
|
|
if (this_thread != NULL) {
|
|
bool is_current = (current == this_thread);
|
|
*found_current = *found_current || is_current;
|
|
st->print("%s", is_current ? "=>" : " ");
|
|
|
|
st->print(PTR_FORMAT, p2i(this_thread));
|
|
st->print(" ");
|
|
this_thread->print_on_error(st, buf, buflen);
|
|
st->cr();
|
|
}
|
|
}
|
|
|
|
class PrintOnErrorClosure : public ThreadClosure {
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outputStream* _st;
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Thread* _current;
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char* _buf;
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int _buflen;
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bool* _found_current;
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public:
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PrintOnErrorClosure(outputStream* st, Thread* current, char* buf,
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int buflen, bool* found_current) :
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_st(st), _current(current), _buf(buf), _buflen(buflen), _found_current(found_current) {}
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virtual void do_thread(Thread* thread) {
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Threads::print_on_error(thread, _st, _current, _buf, _buflen, _found_current);
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}
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};
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// Threads::print_on_error() is called by fatal error handler. It's possible
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// that VM is not at safepoint and/or current thread is inside signal handler.
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// Don't print stack trace, as the stack may not be walkable. Don't allocate
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// memory (even in resource area), it might deadlock the error handler.
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void Threads::print_on_error(outputStream* st, Thread* current, char* buf,
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int buflen) {
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ThreadsSMRSupport::print_info_on(st);
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st->cr();
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bool found_current = false;
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st->print_cr("Java Threads: ( => current thread )");
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ALL_JAVA_THREADS(thread) {
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print_on_error(thread, st, current, buf, buflen, &found_current);
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}
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st->cr();
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st->print_cr("Other Threads:");
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print_on_error(VMThread::vm_thread(), st, current, buf, buflen, &found_current);
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print_on_error(WatcherThread::watcher_thread(), st, current, buf, buflen, &found_current);
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print_on_error(AsyncLogWriter::instance(), st, current, buf, buflen, &found_current);
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if (Universe::heap() != NULL) {
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PrintOnErrorClosure print_closure(st, current, buf, buflen, &found_current);
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Universe::heap()->gc_threads_do(&print_closure);
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}
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if (StringDedup::is_enabled()) {
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PrintOnErrorClosure print_closure(st, current, buf, buflen, &found_current);
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StringDedup::threads_do(&print_closure);
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}
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if (!found_current) {
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st->cr();
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st->print("=>" PTR_FORMAT " (exited) ", p2i(current));
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current->print_on_error(st, buf, buflen);
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st->cr();
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}
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st->cr();
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st->print_cr("Threads with active compile tasks:");
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print_threads_compiling(st, buf, buflen);
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}
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void Threads::print_threads_compiling(outputStream* st, char* buf, int buflen, bool short_form) {
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ALL_JAVA_THREADS(thread) {
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if (thread->is_Compiler_thread()) {
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CompilerThread* ct = (CompilerThread*) thread;
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// Keep task in local variable for NULL check.
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// ct->_task might be set to NULL by concurring compiler thread
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// because it completed the compilation. The task is never freed,
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// though, just returned to a free list.
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CompileTask* task = ct->task();
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if (task != NULL) {
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thread->print_name_on_error(st, buf, buflen);
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st->print(" ");
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task->print(st, NULL, short_form, true);
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}
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}
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}
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}
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// Ad-hoc mutual exclusion primitives: SpinLock
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//
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// We employ SpinLocks _only for low-contention, fixed-length
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// short-duration critical sections where we're concerned
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// about native mutex_t or HotSpot Mutex:: latency.
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//
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// TODO-FIXME: ListLock should be of type SpinLock.
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// We should make this a 1st-class type, integrated into the lock
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// hierarchy as leaf-locks. Critically, the SpinLock structure
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// should have sufficient padding to avoid false-sharing and excessive
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// cache-coherency traffic.
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typedef volatile int SpinLockT;
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void Thread::SpinAcquire(volatile int * adr, const char * LockName) {
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if (Atomic::cmpxchg(adr, 0, 1) == 0) {
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return; // normal fast-path return
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}
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// Slow-path : We've encountered contention -- Spin/Yield/Block strategy.
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int ctr = 0;
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int Yields = 0;
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for (;;) {
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while (*adr != 0) {
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++ctr;
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if ((ctr & 0xFFF) == 0 || !os::is_MP()) {
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if (Yields > 5) {
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os::naked_short_sleep(1);
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} else {
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os::naked_yield();
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++Yields;
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}
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} else {
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SpinPause();
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}
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}
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if (Atomic::cmpxchg(adr, 0, 1) == 0) return;
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}
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}
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void Thread::SpinRelease(volatile int * adr) {
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assert(*adr != 0, "invariant");
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OrderAccess::fence(); // guarantee at least release consistency.
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// Roach-motel semantics.
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// It's safe if subsequent LDs and STs float "up" into the critical section,
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// but prior LDs and STs within the critical section can't be allowed
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// to reorder or float past the ST that releases the lock.
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// Loads and stores in the critical section - which appear in program
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// order before the store that releases the lock - must also appear
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// before the store that releases the lock in memory visibility order.
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// Conceptually we need a #loadstore|#storestore "release" MEMBAR before
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// the ST of 0 into the lock-word which releases the lock, so fence
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// more than covers this on all platforms.
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*adr = 0;
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}
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void Threads::verify() {
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ALL_JAVA_THREADS(p) {
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p->verify();
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}
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VMThread* thread = VMThread::vm_thread();
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if (thread != NULL) thread->verify();
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}
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#ifndef PRODUCT
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void JavaThread::verify_cross_modify_fence_failure(JavaThread *thread) {
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report_vm_error(__FILE__, __LINE__, "Cross modify fence failure", "%p", thread);
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}
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#endif
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// Helper function to create the java.lang.Thread object for a
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// VM-internal thread. The thread will have the given name, and be
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// a member of the "system" ThreadGroup.
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Handle JavaThread::create_system_thread_object(const char* name,
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bool is_visible, TRAPS) {
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Handle string = java_lang_String::create_from_str(name, CHECK_NH);
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// Initialize thread_oop to put it into the system threadGroup.
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// This is done by calling the Thread(ThreadGroup group, String name) constructor.
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Handle thread_group(THREAD, Universe::system_thread_group());
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Handle thread_oop =
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JavaCalls::construct_new_instance(vmClasses::Thread_klass(),
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vmSymbols::threadgroup_string_void_signature(),
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thread_group,
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string,
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CHECK_NH);
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return thread_oop;
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}
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// Starts the target JavaThread as a daemon of the given priority, and
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// bound to the given java.lang.Thread instance.
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// The Threads_lock is held for the duration.
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void JavaThread::start_internal_daemon(JavaThread* current, JavaThread* target,
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Handle thread_oop, ThreadPriority prio) {
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assert(target->osthread() != NULL, "target thread is not properly initialized");
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MutexLocker mu(current, Threads_lock);
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// Initialize the fields of the thread_oop first.
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java_lang_Thread::set_thread(thread_oop(), target); // isAlive == true now
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if (prio != NoPriority) {
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java_lang_Thread::set_priority(thread_oop(), prio);
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// Note: we don't call os::set_priority here. Possibly we should,
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// else all threads should call it themselves when they first run.
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}
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java_lang_Thread::set_daemon(thread_oop());
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// Now bind the thread_oop to the target JavaThread.
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target->set_threadOopHandles(thread_oop());
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Threads::add(target); // target is now visible for safepoint/handshake
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Thread::start(target);
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}
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void JavaThread::vm_exit_on_osthread_failure(JavaThread* thread) {
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// At this point it may be possible that no osthread was created for the
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// JavaThread due to lack of resources. However, since this must work
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// for critical system threads just check and abort if this fails.
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if (thread->osthread() == nullptr) {
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// This isn't really an OOM condition, but historically this is what
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// we report.
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vm_exit_during_initialization("java.lang.OutOfMemoryError",
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os::native_thread_creation_failed_msg());
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}
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}
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