| /* |
| * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2021, Azul Systems, Inc. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "jvm.h" |
| #include "cds/dynamicArchive.hpp" |
| #include "cds/metaspaceShared.hpp" |
| #include "classfile/classLoader.hpp" |
| #include "classfile/javaClasses.hpp" |
| #include "classfile/javaThreadStatus.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "classfile/vmClasses.hpp" |
| #include "classfile/vmSymbols.hpp" |
| #include "code/codeCache.hpp" |
| #include "code/scopeDesc.hpp" |
| #include "compiler/compileBroker.hpp" |
| #include "compiler/compileTask.hpp" |
| #include "compiler/compilerThread.hpp" |
| #include "gc/shared/barrierSet.hpp" |
| #include "gc/shared/collectedHeap.hpp" |
| #include "gc/shared/gcId.hpp" |
| #include "gc/shared/gcLocker.inline.hpp" |
| #include "gc/shared/gcVMOperations.hpp" |
| #include "gc/shared/oopStorage.hpp" |
| #include "gc/shared/oopStorageSet.hpp" |
| #include "gc/shared/stringdedup/stringDedup.hpp" |
| #include "gc/shared/tlab_globals.hpp" |
| #include "interpreter/interpreter.hpp" |
| #include "interpreter/linkResolver.hpp" |
| #include "interpreter/oopMapCache.hpp" |
| #include "jfr/jfrEvents.hpp" |
| #include "jvmtifiles/jvmtiEnv.hpp" |
| #include "logging/log.hpp" |
| #include "logging/logAsyncWriter.hpp" |
| #include "logging/logConfiguration.hpp" |
| #include "logging/logStream.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "memory/iterator.hpp" |
| #include "memory/oopFactory.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "memory/universe.hpp" |
| #include "oops/access.inline.hpp" |
| #include "oops/instanceKlass.hpp" |
| #include "oops/klass.inline.hpp" |
| #include "oops/objArrayOop.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "oops/oopHandle.inline.hpp" |
| #include "oops/symbol.hpp" |
| #include "oops/typeArrayOop.inline.hpp" |
| #include "oops/verifyOopClosure.hpp" |
| #include "prims/jvm_misc.hpp" |
| #include "prims/jvmtiDeferredUpdates.hpp" |
| #include "prims/jvmtiExport.hpp" |
| #include "prims/jvmtiThreadState.hpp" |
| #include "runtime/arguments.hpp" |
| #include "runtime/atomic.hpp" |
| #include "runtime/biasedLocking.hpp" |
| #include "runtime/fieldDescriptor.inline.hpp" |
| #include "runtime/flags/jvmFlagLimit.hpp" |
| #include "runtime/deoptimization.hpp" |
| #include "runtime/frame.inline.hpp" |
| #include "runtime/handles.inline.hpp" |
| #include "runtime/handshake.hpp" |
| #include "runtime/init.hpp" |
| #include "runtime/interfaceSupport.inline.hpp" |
| #include "runtime/java.hpp" |
| #include "runtime/javaCalls.hpp" |
| #include "runtime/jniHandles.inline.hpp" |
| #include "runtime/jniPeriodicChecker.hpp" |
| #include "runtime/monitorDeflationThread.hpp" |
| #include "runtime/mutexLocker.hpp" |
| #include "runtime/nonJavaThread.hpp" |
| #include "runtime/objectMonitor.hpp" |
| #include "runtime/orderAccess.hpp" |
| #include "runtime/osThread.hpp" |
| #include "runtime/prefetch.inline.hpp" |
| #include "runtime/safepoint.hpp" |
| #include "runtime/safepointMechanism.inline.hpp" |
| #include "runtime/safepointVerifiers.hpp" |
| #include "runtime/serviceThread.hpp" |
| #include "runtime/sharedRuntime.hpp" |
| #include "runtime/stackFrameStream.inline.hpp" |
| #include "runtime/stackWatermarkSet.hpp" |
| #include "runtime/statSampler.hpp" |
| #include "runtime/task.hpp" |
| #include "runtime/thread.inline.hpp" |
| #include "runtime/threadCritical.hpp" |
| #include "runtime/threadSMR.inline.hpp" |
| #include "runtime/threadStatisticalInfo.hpp" |
| #include "runtime/threadWXSetters.inline.hpp" |
| #include "runtime/timer.hpp" |
| #include "runtime/timerTrace.hpp" |
| #include "runtime/vframe.inline.hpp" |
| #include "runtime/vframeArray.hpp" |
| #include "runtime/vframe_hp.hpp" |
| #include "runtime/vmThread.hpp" |
| #include "runtime/vmOperations.hpp" |
| #include "runtime/vm_version.hpp" |
| #include "services/attachListener.hpp" |
| #include "services/management.hpp" |
| #include "services/memTracker.hpp" |
| #include "services/threadService.hpp" |
| #include "utilities/align.hpp" |
| #include "utilities/copy.hpp" |
| #include "utilities/defaultStream.hpp" |
| #include "utilities/dtrace.hpp" |
| #include "utilities/events.hpp" |
| #include "utilities/macros.hpp" |
| #include "utilities/preserveException.hpp" |
| #include "utilities/spinYield.hpp" |
| #include "utilities/vmError.hpp" |
| #if INCLUDE_JVMCI |
| #include "jvmci/jvmci.hpp" |
| #include "jvmci/jvmciEnv.hpp" |
| #endif |
| #ifdef COMPILER1 |
| #include "c1/c1_Compiler.hpp" |
| #endif |
| #ifdef COMPILER2 |
| #include "opto/c2compiler.hpp" |
| #include "opto/idealGraphPrinter.hpp" |
| #endif |
| #if INCLUDE_RTM_OPT |
| #include "runtime/rtmLocking.hpp" |
| #endif |
| #if INCLUDE_JFR |
| #include "jfr/jfr.hpp" |
| #endif |
| |
| // Initialization after module runtime initialization |
| void universe_post_module_init(); // must happen after call_initPhase2 |
| |
| #ifdef DTRACE_ENABLED |
| |
| // Only bother with this argument setup if dtrace is available |
| |
| #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_START |
| #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_STOP |
| |
| #define DTRACE_THREAD_PROBE(probe, javathread) \ |
| { \ |
| ResourceMark rm(this); \ |
| int len = 0; \ |
| const char* name = (javathread)->get_thread_name(); \ |
| len = strlen(name); \ |
| HOTSPOT_THREAD_PROBE_##probe(/* probe = start, stop */ \ |
| (char *) name, len, \ |
| java_lang_Thread::thread_id((javathread)->threadObj()), \ |
| (uintptr_t) (javathread)->osthread()->thread_id(), \ |
| java_lang_Thread::is_daemon((javathread)->threadObj())); \ |
| } |
| |
| #else // ndef DTRACE_ENABLED |
| |
| #define DTRACE_THREAD_PROBE(probe, javathread) |
| |
| #endif // ndef DTRACE_ENABLED |
| |
| #ifndef USE_LIBRARY_BASED_TLS_ONLY |
| // Current thread is maintained as a thread-local variable |
| THREAD_LOCAL Thread* Thread::_thr_current = NULL; |
| #endif |
| |
| // ======= Thread ======== |
| // Support for forcing alignment of thread objects for biased locking |
| void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
| if (UseBiasedLocking) { |
| const size_t alignment = markWord::biased_lock_alignment; |
| size_t aligned_size = size + (alignment - sizeof(intptr_t)); |
| void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
| : AllocateHeap(aligned_size, flags, CURRENT_PC, |
| AllocFailStrategy::RETURN_NULL); |
| void* aligned_addr = align_up(real_malloc_addr, alignment); |
| assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= |
| ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), |
| "JavaThread alignment code overflowed allocated storage"); |
| if (aligned_addr != real_malloc_addr) { |
| log_info(biasedlocking)("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, |
| p2i(real_malloc_addr), |
| p2i(aligned_addr)); |
| } |
| ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; |
| return aligned_addr; |
| } else { |
| return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
| : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL); |
| } |
| } |
| |
| void Thread::operator delete(void* p) { |
| if (UseBiasedLocking) { |
| FreeHeap(((Thread*) p)->_real_malloc_address); |
| } else { |
| FreeHeap(p); |
| } |
| } |
| |
| void JavaThread::smr_delete() { |
| if (_on_thread_list) { |
| ThreadsSMRSupport::smr_delete(this); |
| } else { |
| delete this; |
| } |
| } |
| |
| // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, |
| // JavaThread |
| |
| DEBUG_ONLY(Thread* Thread::_starting_thread = NULL;) |
| |
| Thread::Thread() { |
| |
| DEBUG_ONLY(_run_state = PRE_CALL_RUN;) |
| |
| // stack and get_thread |
| set_stack_base(NULL); |
| set_stack_size(0); |
| set_lgrp_id(-1); |
| DEBUG_ONLY(clear_suspendible_thread();) |
| |
| // allocated data structures |
| set_osthread(NULL); |
| set_resource_area(new (mtThread)ResourceArea()); |
| DEBUG_ONLY(_current_resource_mark = NULL;) |
| set_handle_area(new (mtThread) HandleArea(NULL)); |
| set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(30, mtClass)); |
| set_active_handles(NULL); |
| set_free_handle_block(NULL); |
| set_last_handle_mark(NULL); |
| DEBUG_ONLY(_missed_ic_stub_refill_verifier = NULL); |
| |
| // Initial value of zero ==> never claimed. |
| _threads_do_token = 0; |
| _threads_hazard_ptr = NULL; |
| _threads_list_ptr = NULL; |
| _nested_threads_hazard_ptr_cnt = 0; |
| _rcu_counter = 0; |
| |
| // the handle mark links itself to last_handle_mark |
| new HandleMark(this); |
| |
| // plain initialization |
| debug_only(_owned_locks = NULL;) |
| NOT_PRODUCT(_skip_gcalot = false;) |
| _jvmti_env_iteration_count = 0; |
| set_allocated_bytes(0); |
| _current_pending_raw_monitor = NULL; |
| |
| // thread-specific hashCode stream generator state - Marsaglia shift-xor form |
| _hashStateX = os::random(); |
| _hashStateY = 842502087; |
| _hashStateZ = 0x8767; // (int)(3579807591LL & 0xffff) ; |
| _hashStateW = 273326509; |
| |
| // Many of the following fields are effectively final - immutable |
| // Note that nascent threads can't use the Native Monitor-Mutex |
| // construct until the _MutexEvent is initialized ... |
| // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents |
| // we might instead use a stack of ParkEvents that we could provision on-demand. |
| // The stack would act as a cache to avoid calls to ParkEvent::Allocate() |
| // and ::Release() |
| _ParkEvent = ParkEvent::Allocate(this); |
| |
| #ifdef CHECK_UNHANDLED_OOPS |
| if (CheckUnhandledOops) { |
| _unhandled_oops = new UnhandledOops(this); |
| } |
| #endif // CHECK_UNHANDLED_OOPS |
| #ifdef ASSERT |
| if (UseBiasedLocking) { |
| assert(is_aligned(this, markWord::biased_lock_alignment), "forced alignment of thread object failed"); |
| assert(this == _real_malloc_address || |
| this == align_up(_real_malloc_address, markWord::biased_lock_alignment), |
| "bug in forced alignment of thread objects"); |
| } |
| #endif // ASSERT |
| |
| // Notify the barrier set that a thread is being created. The initial |
| // thread is created before the barrier set is available. The call to |
| // BarrierSet::on_thread_create() for this thread is therefore deferred |
| // to BarrierSet::set_barrier_set(). |
| BarrierSet* const barrier_set = BarrierSet::barrier_set(); |
| if (barrier_set != NULL) { |
| barrier_set->on_thread_create(this); |
| } else { |
| // Only the main thread should be created before the barrier set |
| // and that happens just before Thread::current is set. No other thread |
| // can attach as the VM is not created yet, so they can't execute this code. |
| // If the main thread creates other threads before the barrier set that is an error. |
| assert(Thread::current_or_null() == NULL, "creating thread before barrier set"); |
| } |
| |
| MACOS_AARCH64_ONLY(DEBUG_ONLY(_wx_init = false)); |
| } |
| |
| void Thread::initialize_tlab() { |
| if (UseTLAB) { |
| tlab().initialize(); |
| } |
| } |
| |
| void Thread::initialize_thread_current() { |
| #ifndef USE_LIBRARY_BASED_TLS_ONLY |
| assert(_thr_current == NULL, "Thread::current already initialized"); |
| _thr_current = this; |
| #endif |
| assert(ThreadLocalStorage::thread() == NULL, "ThreadLocalStorage::thread already initialized"); |
| ThreadLocalStorage::set_thread(this); |
| assert(Thread::current() == ThreadLocalStorage::thread(), "TLS mismatch!"); |
| } |
| |
| void Thread::clear_thread_current() { |
| assert(Thread::current() == ThreadLocalStorage::thread(), "TLS mismatch!"); |
| #ifndef USE_LIBRARY_BASED_TLS_ONLY |
| _thr_current = NULL; |
| #endif |
| ThreadLocalStorage::set_thread(NULL); |
| } |
| |
| void Thread::record_stack_base_and_size() { |
| // Note: at this point, Thread object is not yet initialized. Do not rely on |
| // any members being initialized. Do not rely on Thread::current() being set. |
| // If possible, refrain from doing anything which may crash or assert since |
| // quite probably those crash dumps will be useless. |
| set_stack_base(os::current_stack_base()); |
| set_stack_size(os::current_stack_size()); |
| |
| // Set stack limits after thread is initialized. |
| if (is_Java_thread()) { |
| as_Java_thread()->stack_overflow_state()->initialize(stack_base(), stack_end()); |
| } |
| } |
| |
| #if INCLUDE_NMT |
| void Thread::register_thread_stack_with_NMT() { |
| MemTracker::record_thread_stack(stack_end(), stack_size()); |
| } |
| |
| void Thread::unregister_thread_stack_with_NMT() { |
| MemTracker::release_thread_stack(stack_end(), stack_size()); |
| } |
| #endif // INCLUDE_NMT |
| |
| void Thread::call_run() { |
| DEBUG_ONLY(_run_state = CALL_RUN;) |
| |
| // At this point, Thread object should be fully initialized and |
| // Thread::current() should be set. |
| |
| assert(Thread::current_or_null() != NULL, "current thread is unset"); |
| assert(Thread::current_or_null() == this, "current thread is wrong"); |
| |
| // Perform common initialization actions |
| |
| register_thread_stack_with_NMT(); |
| |
| MACOS_AARCH64_ONLY(this->init_wx()); |
| |
| JFR_ONLY(Jfr::on_thread_start(this);) |
| |
| log_debug(os, thread)("Thread " UINTX_FORMAT " stack dimensions: " |
| PTR_FORMAT "-" PTR_FORMAT " (" SIZE_FORMAT "k).", |
| os::current_thread_id(), p2i(stack_end()), |
| p2i(stack_base()), stack_size()/1024); |
| |
| // Perform <ChildClass> initialization actions |
| DEBUG_ONLY(_run_state = PRE_RUN;) |
| this->pre_run(); |
| |
| // Invoke <ChildClass>::run() |
| DEBUG_ONLY(_run_state = RUN;) |
| this->run(); |
| // Returned from <ChildClass>::run(). Thread finished. |
| |
| // Perform common tear-down actions |
| |
| assert(Thread::current_or_null() != NULL, "current thread is unset"); |
| assert(Thread::current_or_null() == this, "current thread is wrong"); |
| |
| // Perform <ChildClass> tear-down actions |
| DEBUG_ONLY(_run_state = POST_RUN;) |
| this->post_run(); |
| |
| // Note: at this point the thread object may already have deleted itself, |
| // so from here on do not dereference *this*. Not all thread types currently |
| // delete themselves when they terminate. But no thread should ever be deleted |
| // asynchronously with respect to its termination - that is what _run_state can |
| // be used to check. |
| |
| assert(Thread::current_or_null() == NULL, "current thread still present"); |
| } |
| |
| Thread::~Thread() { |
| |
| // Attached threads will remain in PRE_CALL_RUN, as will threads that don't actually |
| // get started due to errors etc. Any active thread should at least reach post_run |
| // before it is deleted (usually in post_run()). |
| assert(_run_state == PRE_CALL_RUN || |
| _run_state == POST_RUN, "Active Thread deleted before post_run(): " |
| "_run_state=%d", (int)_run_state); |
| |
| // Notify the barrier set that a thread is being destroyed. Note that a barrier |
| // set might not be available if we encountered errors during bootstrapping. |
| BarrierSet* const barrier_set = BarrierSet::barrier_set(); |
| if (barrier_set != NULL) { |
| barrier_set->on_thread_destroy(this); |
| } |
| |
| // deallocate data structures |
| delete resource_area(); |
| // since the handle marks are using the handle area, we have to deallocated the root |
| // handle mark before deallocating the thread's handle area, |
| assert(last_handle_mark() != NULL, "check we have an element"); |
| delete last_handle_mark(); |
| assert(last_handle_mark() == NULL, "check we have reached the end"); |
| |
| ParkEvent::Release(_ParkEvent); |
| // Set to NULL as a termination indicator for has_terminated(). |
| Atomic::store(&_ParkEvent, (ParkEvent*)NULL); |
| |
| delete handle_area(); |
| delete metadata_handles(); |
| |
| // osthread() can be NULL, if creation of thread failed. |
| if (osthread() != NULL) os::free_thread(osthread()); |
| |
| // Clear Thread::current if thread is deleting itself and it has not |
| // already been done. This must be done before the memory is deallocated. |
| // Needed to ensure JNI correctly detects non-attached threads. |
| if (this == Thread::current_or_null()) { |
| Thread::clear_thread_current(); |
| } |
| |
| CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) |
| } |
| |
| #ifdef ASSERT |
| // A JavaThread is considered dangling if it not handshake-safe with respect to |
| // the current thread, it is not on a ThreadsList, or not at safepoint. |
| void Thread::check_for_dangling_thread_pointer(Thread *thread) { |
| assert(!thread->is_Java_thread() || |
| thread->as_Java_thread()->is_handshake_safe_for(Thread::current()) || |
| !thread->as_Java_thread()->on_thread_list() || |
| SafepointSynchronize::is_at_safepoint() || |
| ThreadsSMRSupport::is_a_protected_JavaThread_with_lock(thread->as_Java_thread()), |
| "possibility of dangling Thread pointer"); |
| } |
| #endif |
| |
| // Is the target JavaThread protected by the calling Thread |
| // or by some other mechanism: |
| bool Thread::is_JavaThread_protected(const JavaThread* p) { |
| // Do the simplest check first: |
| if (SafepointSynchronize::is_at_safepoint()) { |
| // The target is protected since JavaThreads cannot exit |
| // while we're at a safepoint. |
| return true; |
| } |
| |
| // Now make the simple checks based on who the caller is: |
| Thread* current_thread = Thread::current(); |
| if (current_thread == p || Threads_lock->owner() == current_thread) { |
| // Target JavaThread is self or calling thread owns the Threads_lock. |
| // Second check is the same as Threads_lock->owner_is_self(), |
| // 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: |
| for (SafeThreadsListPtr* stlp = current_thread->_threads_list_ptr; |
| stlp != NULL; stlp = stlp->previous()) { |
| if (stlp->list()->includes(p)) { |
| // The target JavaThread is protected by this ThreadsList: |
| 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 p=" |
| // INTPTR_FORMAT, p2i(current_thread), p2i(p)); |
| |
| // Note: Since 'p' isn't protected by a TLH, the call to |
| // p->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(p->is_handshake_safe_for(current_thread), "JavaThread=" INTPTR_FORMAT |
| " is not protected and not handshake safe.", p2i(p)); |
| |
| // The target JavaThread is not protected 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(thread->as_Java_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) { |
| if (active_handles() != NULL) { |
| active_handles()->oops_do(f); |
| } |
| // 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)); |
| 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"); |
| |
| if (is_VM_thread()) { st->print("VMThread"); } |
| else if (is_GC_task_thread()) { st->print("GCTaskThread"); } |
| else if (is_Watcher_thread()) { st->print("WatcherThread"); } |
| else if (is_ConcurrentGC_thread()) { st->print("ConcurrentGCThread"); } |
| else { st->print("Thread"); } |
| |
| if (is_Named_thread()) { |
| st->print(" \"%s\"", 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(this->as_Java_thread()); |
| } |
| |
| 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); |
| java_lang_Thread::set_priority(thread_oop(), NormPriority); |
| thread->set_threadObj(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; |
| |
| oop JavaThread::threadObj() const { |
| return _threadObj.resolve(); |
| } |
| |
| void JavaThread::set_threadObj(oop p) { |
| assert(_thread_oop_storage != NULL, "not yet initialized"); |
| _threadObj = OopHandle(_thread_oop_storage, p); |
| } |
| |
| OopStorage* JavaThread::thread_oop_storage() { |
| assert(_thread_oop_storage != NULL, "not yet initialized"); |
| return _thread_oop_storage; |
| } |
| |
| 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); |
| java_lang_Thread::set_priority(thread_oop(), NormPriority); |
| set_threadObj(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); |
| } |
| |
| |
| if (daemon) { |
| java_lang_Thread::set_daemon(thread_oop()); |
| } |
| |
| if (HAS_PENDING_EXCEPTION) { |
| return; |
| } |
| |
| Klass* group = vmClasses::ThreadGroup_klass(); |
| Handle threadObj(THREAD, this->threadObj()); |
| |
| JavaCalls::call_special(&result, |
| thread_group, |
| group, |
| vmSymbols::add_method_name(), |
| vmSymbols::thread_void_signature(), |
| threadObj, // Arg 1 |
| THREAD); |
| } |
| |
| // ======= 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 (JavaThreadIteratorWithHandle jtiwh; JavaThread *tp = jtiwh.next(); ) { |
| 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 (JavaThreadIteratorWithHandle jtiwh; JavaThread *tp = jtiwh.next(); ) { |
| 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 |
| } |
| |
| 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 |
| |
| _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), |
| _Stalled(0), |
| |
| _monitor_chunks(nullptr), |
| |
| _suspend_flags(0), |
| _async_exception_condition(_no_async_condition), |
| _pending_async_exception(nullptr), |
| |
| _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), |
| _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}, |
| _jvmci_counters(nullptr), |
| _jvmci_reserved0(nullptr), |
| _jvmci_reserved1(nullptr), |
| _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), |
| |
| _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(), |
| _cached_monitor_info(nullptr), |
| |
| _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 |
| 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); |
| 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); |
| |
| // 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 |
| ThreadStateTransition::transition(this, _thread_new, _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->get_thread_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(), |
| get_thread_name()); |
| CLEAR_PENDING_EXCEPTION; |
| } |
| } |
| |
| // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
| // the execution of the method. If that is not enough, then we don't really care. Thread.stop |
| // is deprecated anyhow. |
| if (!is_Compiler_thread()) { |
| int count = 3; |
| while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { |
| 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"); |
| } |
| |
| // 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(get_thread_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 thread->as_Java_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 : op->calling_thread()->as_Java_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; |
| } |
| |
| 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()); |
| } |
| } |
| |
| |
| // Asynchronous exceptions support |
| // |
| // Note: this function shouldn't block if it's called in |
| // _thread_in_native_trans state (such as from |
| // check_special_condition_for_native_trans()). |
| void JavaThread::check_and_handle_async_exceptions() { |
| if (has_last_Java_frame() && has_async_exception_condition()) { |
| // If we are at a polling page safepoint (not a poll return) |
| // then we must defer async exception because live registers |
| // will be clobbered by the exception path. Poll return is |
| // ok because the call we a returning from already collides |
| // with exception handling registers and so there is no issue. |
| // (The exception handling path kills call result registers but |
| // this is ok since the exception kills the result anyway). |
| |
| if (is_at_poll_safepoint()) { |
| // if the code we are returning to has deoptimized we must defer |
| // the exception otherwise live registers get clobbered on the |
| // exception path before deoptimization is able to retrieve them. |
| // |
| RegisterMap map(this, false); |
| frame caller_fr = last_frame().sender(&map); |
| assert(caller_fr.is_compiled_frame(), "what?"); |
| if (caller_fr.is_deoptimized_frame()) { |
| log_info(exceptions)("deferred async exception at compiled safepoint"); |
| return; |
| } |
| } |
| } |
| |
| AsyncExceptionCondition condition = clear_async_exception_condition(); |
| if (condition == _no_async_condition) { |
| // Conditions have changed since has_special_runtime_exit_condition() |
| // was called: |
| // - if we were here only because of an external suspend request, |
| // then that was taken care of above (or cancelled) so we are done |
| // - if we were here because of another async request, then it has |
| // been cleared between the has_special_runtime_exit_condition() |
| // and now so again we are done |
| return; |
| } |
| |
| // Check for pending async. exception |
| if (_pending_async_exception != NULL) { |
| // 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(_pending_async_exception, __FILE__, __LINE__); |
| |
| 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", _pending_async_exception->klass()->external_name()); |
| } |
| _pending_async_exception = NULL; |
| // Clear condition from _suspend_flags since we have finished processing it. |
| clear_suspend_flag(_has_async_exception); |
| } |
| } |
| |
| if (condition == _async_unsafe_access_error && !has_pending_exception()) { |
| // We may be at method entry which requires we save the do-not-unlock flag. |
| UnlockFlagSaver fs(this); |
| switch (thread_state()) { |
| case _thread_in_vm: { |
| JavaThread* THREAD = this; |
| Exceptions::throw_unsafe_access_internal_error(THREAD, __FILE__, __LINE__, "a fault occurred in an unsafe memory access operation"); |
| return; |
| } |
| case _thread_in_native: { |
| ThreadInVMfromNative tiv(this); |
| JavaThread* THREAD = this; |
| Exceptions::throw_unsafe_access_internal_error(THREAD, __FILE__, __LINE__, "a fault occurred in an unsafe memory access operation"); |
| return; |
| } |
| case _thread_in_Java: { |
| ThreadInVMfromJava tiv(this); |
| JavaThread* THREAD = this; |
| Exceptions::throw_unsafe_access_internal_error(THREAD, __FILE__, __LINE__, "a fault occurred in a recent unsafe memory access operation in compiled Java code"); |
| return; |
| } |
| default: |
| ShouldNotReachHere(); |
| } |
| } |
| |
| assert(has_pending_exception(), "must have handled the async condition if no exception"); |
| } |
| |
| void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { |
| |
| if (is_obj_deopt_suspend()) { |
| frame_anchor()->make_walkable(this); |
| wait_for_object_deoptimization(); |
| } |
| |
| // We might be here for reasons in addition to the self-suspend request |
| // so check for other async requests. |
| if (check_asyncs) { |
| check_and_handle_async_exceptions(); |
| } |
| |
| JFR_ONLY(SUSPEND_THREAD_CONDITIONAL(this);) |
| } |
| |
| class InstallAsyncExceptionClosure : public HandshakeClosure { |
| Handle _throwable; // The Throwable thrown at the target Thread |
| public: |
| InstallAsyncExceptionClosure(Handle throwable) : HandshakeClosure("InstallAsyncException"), _throwable(throwable) {} |
| |
| void do_thread(Thread* thr) { |
| JavaThread* target = thr->as_Java_thread(); |
| // Note that this now allows multiple ThreadDeath exceptions to be |
| // thrown at a thread. |
| // The target thread has run and has not exited yet. |
| target->send_thread_stop(_throwable()); |
| } |
| }; |
| |
| void JavaThread::send_async_exception(oop java_thread, oop java_throwable) { |
| Handle throwable(Thread::current(), java_throwable); |
| JavaThread* target = java_lang_Thread::thread(java_thread); |
| InstallAsyncExceptionClosure vm_stop(throwable); |
| Handshake::execute(&vm_stop, target); |
| } |
| |
| void JavaThread::send_thread_stop(oop java_throwable) { |
| ResourceMark rm; |
| assert(is_handshake_safe_for(Thread::current()), |
| "should be self or handshakee"); |
| |
| // Do not throw asynchronous exceptions against the compiler thread |
| // (the compiler thread should not be a Java thread -- fix in 1.4.2) |
| if (!can_call_java()) return; |
| |
| { |
| // Actually throw the Throwable against the target Thread - however |
| // only if there is no thread death exception installed already. |
| if (_pending_async_exception == NULL || !_pending_async_exception->is_a(vmClasses::ThreadDeath_klass())) { |
| // 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 |
| if (has_last_Java_frame()) { |
| frame f = last_frame(); |
| if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { |
| RegisterMap reg_map(this, false); |
| frame compiled_frame = f.sender(®_map); |
| if (!StressCompiledExceptionHandlers && compiled_frame.can_be_deoptimized()) { |
| Deoptimization::deoptimize(this, compiled_frame); |
| } |
| } |
| } |
| |
| // Set async. pending exception in thread. |
| set_pending_async_exception(java_throwable); |
| |
| if (log_is_enabled(Info, exceptions)) { |
| ResourceMark rm; |
| log_info(exceptions)("Pending Async. exception installed of type: %s", |
| InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
| } |
| // for AbortVMOnException flag |
| Exceptions::debug_check_abort(_pending_async_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(); |
| } |
| |
| |
| // 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() { |
| ThreadsListHandle tlh; |
| if (!tlh.includes(this)) { |
| log_trace(thread, suspend)("JavaThread:" INTPTR_FORMAT " not on ThreadsList, no suspension", p2i(this)); |
| return false; |
| } |
| return this->handshake_state()->suspend(); |
| } |
| |
| bool JavaThread::java_resume() { |
| ThreadsListHandle tlh; |
| if (!tlh.includes(this)) { |
| log_trace(thread, suspend)("JavaThread:" INTPTR_FORMAT " not on ThreadsList, nothing to resume", p2i(this)); |
| return false; |
| } |
| return this->handshake_state()->resume(); |
| } |
| |
| // Wait for another thread to perform object reallocation and relocking on behalf of |
| // this thread. |
| // Raw thread state transition to _thread_blocked and back again to the original |
| // state before returning are performed. 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. We cannot use the thread state transition |
| // helpers because we arrive here in various states and also because the helpers |
| // indirectly call this method. After leaving _thread_blocked we have to check |
| // for safepoint/handshake, except if _thread_in_native. The thread is safe |
| // without blocking then. Allowed states are enumerated in |
| // SafepointSynchronize::block(). See also 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"); |
| JavaThreadState state = thread_state(); |
| |
| bool spin_wait = os::is_MP(); |
| do { |
| set_thread_state(_thread_blocked); |
| // 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(); |
| } |
| } |
| // The current thread could have been suspended again. We have to check for |
| // suspend after restoring the saved state. Without this the current thread |
| // might return to _thread_in_Java and execute bytecode. |
| set_thread_state_fence(state); |
| |
| if (state != _thread_in_native) { |
| SafepointMechanism::process_if_requested(this); |
| } |
| // 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"); |
| |
| // Enable WXWrite: called directly from interpreter native wrapper. |
| MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, thread)); |
| |
| SafepointMechanism::process_if_requested_with_exit_check(thread, false /* 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); |
| |
| if (thread->has_async_exception_condition(false /* check unsafe access error */)) { |
| // We are in _thread_in_native_trans state, don't handle unsafe |
| // access error since that may block. |
| thread->check_and_handle_async_exceptions(); |
| } |
| } |
| |
| #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 |
| |
| 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); |
| |
| 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); |
| f->do_oop((oop*) &_pending_async_exception); |
| #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();) |
| |
| 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"; |
| } |
| } |
| |
| #ifndef PRODUCT |
| void JavaThread::print_thread_state_on(outputStream *st) const { |
| st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); |
| }; |
| #endif // PRODUCT |
| |
| // 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(get_thread_name()); |
| st->print_raw("\" "); |
| oop thread_oop = threadObj(); |
| if (thread_oop != NULL) { |
| st->print("#" INT64_FORMAT " ", (int64_t)java_lang_Thread::thread_id(thread_oop)); |
| 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) { |
| 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("JavaThread \"%s\"", 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::get_thread_name() const { |
| if (Thread::is_JavaThread_protected(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 = Thread::name(); |
| } |
| } else { |
| name_str = Thread::name(); |
| } |
| assert(name_str != NULL, "unexpected NULL thread name"); |
| 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_threadObj(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); |
| vframe* start_vf = 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; |
| } |
| } |
| |
| |
| // 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, false /* update */, true /* process_frames */); !fst.is_done(); fst.next()) { |
| fst.current()->describe(values, ++frame_no); |
| if (depth == frame_no) break; |
| } |
| 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); |
| trace_stack_from(last_java_vframe(®_map)); |
| } |
| |
| |
| #endif // PRODUCT |
| |
| |
| javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { |
| assert(reg_map != NULL, "a map must be given"); |
| frame f = last_frame(); |
| 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; |
| } |
| |
| |
| Klass* JavaThread::security_get_caller_class(int depth) { |
| 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 |
| |
| static inline void *prefetch_and_load_ptr(void **addr, intx prefetch_interval) { |
| Prefetch::read((void*)addr, prefetch_interval); |
| return *addr; |
| } |
| |
| // Possibly the ugliest for loop the world has seen. C++ does not allow |
| // multiple types in the declaration section of the for loop. In this case |
| // we are only dealing with pointers and hence can cast them. It looks ugly |
| // but macros are ugly and therefore it's fine to make things absurdly ugly. |
| #define DO_JAVA_THREADS(LIST, X) \ |
| for (JavaThread *MACRO_scan_interval = (JavaThread*)(uintptr_t)PrefetchScanIntervalInBytes, \ |
| *MACRO_list = (JavaThread*)(LIST), \ |
| **MACRO_end = ((JavaThread**)((ThreadsList*)MACRO_list)->threads()) + ((ThreadsList*)MACRO_list)->length(), \ |
| **MACRO_current_p = (JavaThread**)((ThreadsList*)MACRO_list)->threads(), \ |
| *X = (JavaThread*)prefetch_and_load_ptr((void**)MACRO_current_p, (intx)MACRO_scan_interval); \ |
| MACRO_current_p != MACRO_end; \ |
| MACRO_current_p++, \ |
| X = (JavaThread*)prefetch_and_load_ptr((void**)MACRO_current_p, (intx)MACRO_scan_interval)) |
| |
| // All JavaThreads |
| #define ALL_JAVA_THREADS(X) DO_JAVA_THREADS(ThreadsSMRSupport::get_java_thread_list(), X) |
| |
| // 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 |
| 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; |
| |
| 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(); |
| Thread* 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->active_handles() == NULL) { |
| 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(); |
| |
| BiasedLocking::init(); |
| |
| #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_and_cleanup_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 (DynamicDumpSharedSpaces) { |
| DynamicArchive::prepare_for_dynamic_dumping_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; |
| DO_JAVA_THREADS(t_list, p) { |
| 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; |
| |
| DO_JAVA_THREADS(t_list, p) { |
| // 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; |
| DO_JAVA_THREADS(t_list, q) { |
| 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 { |
| outputStream* _st; |
| Thread* _current; |
| char* _buf; |
| int _buflen; |
| bool* _found_current; |
| public: |
| PrintOnErrorClosure(outputStream* st, Thread* current, char* buf, |
| int buflen, bool* found_current) : |
| _st(st), _current(current), _buf(buf), _buflen(buflen), _found_current(found_current) {} |
| |
| virtual void do_thread(Thread* thread) { |
| Threads::print_on_error(thread, _st, _current, _buf, _buflen, _found_current); |
| } |
| }; |
| |
| // Threads::print_on_error() is called by fatal error handler. It's possible |
| // that VM is not at safepoint and/or current thread is inside signal handler. |
| // Don't print stack trace, as the stack may not be walkable. Don't allocate |
| // memory (even in resource area), it might deadlock the error handler. |
| void Threads::print_on_error(outputStream* st, Thread* current, char* buf, |
| int buflen) { |
| ThreadsSMRSupport::print_info_on(st); |
| st->cr(); |
| |
| bool found_current = false; |
| st->print_cr("Java Threads: ( => current thread )"); |
| ALL_JAVA_THREADS(thread) { |
| print_on_error(thread, st, current, buf, buflen, &found_current); |
| } |
| st->cr(); |
| |
| st->print_cr("Other Threads:"); |
| print_on_error(VMThread::vm_thread(), st, current, buf, buflen, &found_current); |
| print_on_error(WatcherThread::watcher_thread(), st, current, buf, buflen, &found_current); |
| print_on_error(AsyncLogWriter::instance(), st, current, buf, buflen, &found_current); |
| |
| if (Universe::heap() != NULL) { |
| PrintOnErrorClosure print_closure(st, current, buf, buflen, &found_current); |
| Universe::heap()->gc_threads_do(&print_closure); |
| } |
| |
| if (StringDedup::is_enabled()) { |
| PrintOnErrorClosure print_closure(st, current, buf, buflen, &found_current); |
| StringDedup::threads_do(&print_closure); |
| } |
| |
| if (!found_current) { |
| st->cr(); |
| st->print("=>" PTR_FORMAT " (exited) ", p2i(current)); |
| current->print_on_error(st, buf, buflen); |
| st->cr(); |
| } |
| st->cr(); |
| |
| st->print_cr("Threads with active compile tasks:"); |
| print_threads_compiling(st, buf, buflen); |
| } |
| |
| void Threads::print_threads_compiling(outputStream* st, char* buf, int buflen, bool short_form) { |
| ALL_JAVA_THREADS(thread) { |
| if (thread->is_Compiler_thread()) { |
| CompilerThread* ct = (CompilerThread*) thread; |
| |
| // Keep task in local variable for NULL check. |
| // ct->_task might be set to NULL by concurring compiler thread |
| // because it completed the compilation. The task is never freed, |
| // though, just returned to a free list. |
| CompileTask* task = ct->task(); |
| if (task != NULL) { |
| thread->print_name_on_error(st, buf, buflen); |
| st->print(" "); |
| task->print(st, NULL, short_form, true); |
| } |
| } |
| } |
| } |
| |
| |
| // Ad-hoc mutual exclusion primitives: SpinLock |
| // |
| // We employ SpinLocks _only for low-contention, fixed-length |
| // short-duration critical sections where we're concerned |
| // about native mutex_t or HotSpot Mutex:: latency. |
| // |
| // TODO-FIXME: ListLock should be of type SpinLock. |
| // We should make this a 1st-class type, integrated into the lock |
| // hierarchy as leaf-locks. Critically, the SpinLock structure |
| // should have sufficient padding to avoid false-sharing and excessive |
| // cache-coherency traffic. |
| |
| |
| typedef volatile int SpinLockT; |
| |
| void Thread::SpinAcquire(volatile int * adr, const char * LockName) { |
| if (Atomic::cmpxchg(adr, 0, 1) == 0) { |
| return; // normal fast-path return |
| } |
| |
| // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. |
| int ctr = 0; |
| int Yields = 0; |
| for (;;) { |
| while (*adr != 0) { |
| ++ctr; |
| if ((ctr & 0xFFF) == 0 || !os::is_MP()) { |
| if (Yields > 5) { |
| os::naked_short_sleep(1); |
| } else { |
| os::naked_yield(); |
| ++Yields; |
| } |
| } else { |
| SpinPause(); |
| } |
| } |
| if (Atomic::cmpxchg(adr, 0, 1) == 0) return; |
| } |
| } |
| |
| void Thread::SpinRelease(volatile int * adr) { |
| assert(*adr != 0, "invariant"); |
| OrderAccess::fence(); // guarantee at least release consistency. |
| // Roach-motel semantics. |
| // It's safe if subsequent LDs and STs float "up" into the critical section, |
| // but prior LDs and STs within the critical section can't be allowed |
| // to reorder or float past the ST that releases the lock. |
| // Loads and stores in the critical section - which appear in program |
| // order before the store that releases the lock - must also appear |
| // before the store that releases the lock in memory visibility order. |
| // Conceptually we need a #loadstore|#storestore "release" MEMBAR before |
| // the ST of 0 into the lock-word which releases the lock, so fence |
| // more than covers this on all platforms. |
| *adr = 0; |
| } |
| |
| |
| void Threads::verify() { |
| ALL_JAVA_THREADS(p) { |
| p->verify(); |
| } |
| VMThread* thread = VMThread::vm_thread(); |
| if (thread != NULL) thread->verify(); |
| } |
| |
| #ifndef PRODUCT |
| void JavaThread::verify_cross_modify_fence_failure(JavaThread *thread) { |
| report_vm_error(__FILE__, __LINE__, "Cross modify fence failure", "%p", thread); |
| } |
| #endif |