/* * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_RUNTIME_THREAD_HPP #define SHARE_VM_RUNTIME_THREAD_HPP #include "jni.h" #include "gc/shared/gcThreadLocalData.hpp" #include "gc/shared/threadLocalAllocBuffer.hpp" #include "memory/allocation.hpp" #include "oops/oop.hpp" #include "prims/jvmtiExport.hpp" #include "runtime/frame.hpp" #include "runtime/globals.hpp" #include "runtime/handshake.hpp" #include "runtime/javaFrameAnchor.hpp" #include "runtime/jniHandles.hpp" #include "runtime/mutexLocker.hpp" #include "runtime/os.hpp" #include "runtime/osThread.hpp" #include "runtime/park.hpp" #include "runtime/safepoint.hpp" #include "runtime/stubRoutines.hpp" #include "runtime/threadLocalStorage.hpp" #include "runtime/unhandledOops.hpp" #include "utilities/align.hpp" #include "utilities/exceptions.hpp" #include "utilities/macros.hpp" #ifdef ZERO # include "stack_zero.hpp" #endif #if INCLUDE_JFR #include "jfr/support/jfrThreadExtension.hpp" #endif class SafeThreadsListPtr; class ThreadSafepointState; class ThreadsList; class ThreadsSMRSupport; class JvmtiThreadState; class JvmtiGetLoadedClassesClosure; class ThreadStatistics; class ConcurrentLocksDump; class ParkEvent; class Parker; class ciEnv; class CompileThread; class CompileLog; class CompileTask; class CompileQueue; class CompilerCounters; class vframeArray; class DeoptResourceMark; class jvmtiDeferredLocalVariableSet; class GCTaskQueue; class ThreadClosure; class IdealGraphPrinter; class Metadata; template class ChunkedList; typedef ChunkedList MetadataOnStackBuffer; DEBUG_ONLY(class ResourceMark;) class WorkerThread; // Class hierarchy // - Thread // - NamedThread // - VMThread // - ConcurrentGCThread // - WorkerThread // - GangWorker // - GCTaskThread // - JavaThread // - various subclasses eg CompilerThread, ServiceThread // - WatcherThread class Thread: public ThreadShadow { friend class VMStructs; friend class JVMCIVMStructs; private: #ifndef USE_LIBRARY_BASED_TLS_ONLY // Current thread is maintained as a thread-local variable static THREAD_LOCAL_DECL Thread* _thr_current; #endif private: // Thread local data area available to the GC. The internal // structure and contents of this data area is GC-specific. // Only GC and GC barrier code should access this data area. GCThreadLocalData _gc_data; public: static ByteSize gc_data_offset() { return byte_offset_of(Thread, _gc_data); } template T* gc_data() { STATIC_ASSERT(sizeof(T) <= sizeof(_gc_data)); return reinterpret_cast(&_gc_data); } // Exception handling // (Note: _pending_exception and friends are in ThreadShadow) //oop _pending_exception; // pending exception for current thread // const char* _exception_file; // file information for exception (debugging only) // int _exception_line; // line information for exception (debugging only) protected: // Support for forcing alignment of thread objects for biased locking void* _real_malloc_address; // JavaThread lifecycle support: friend class SafeThreadsListPtr; // for _threads_list_ptr, cmpxchg_threads_hazard_ptr(), {dec_,inc_,}nested_threads_hazard_ptr_cnt(), {g,s}et_threads_hazard_ptr(), inc_nested_handle_cnt(), tag_hazard_ptr() access friend class ScanHazardPtrGatherProtectedThreadsClosure; // for cmpxchg_threads_hazard_ptr(), get_threads_hazard_ptr(), is_hazard_ptr_tagged() access friend class ScanHazardPtrGatherThreadsListClosure; // for get_threads_hazard_ptr(), untag_hazard_ptr() access friend class ScanHazardPtrPrintMatchingThreadsClosure; // for get_threads_hazard_ptr(), is_hazard_ptr_tagged() access friend class ThreadsSMRSupport; // for _nested_threads_hazard_ptr_cnt, _threads_hazard_ptr, _threads_list_ptr access ThreadsList* volatile _threads_hazard_ptr; SafeThreadsListPtr* _threads_list_ptr; ThreadsList* cmpxchg_threads_hazard_ptr(ThreadsList* exchange_value, ThreadsList* compare_value); ThreadsList* get_threads_hazard_ptr(); void set_threads_hazard_ptr(ThreadsList* new_list); static bool is_hazard_ptr_tagged(ThreadsList* list) { return (intptr_t(list) & intptr_t(1)) == intptr_t(1); } static ThreadsList* tag_hazard_ptr(ThreadsList* list) { return (ThreadsList*)(intptr_t(list) | intptr_t(1)); } static ThreadsList* untag_hazard_ptr(ThreadsList* list) { return (ThreadsList*)(intptr_t(list) & ~intptr_t(1)); } // This field is enabled via -XX:+EnableThreadSMRStatistics: uint _nested_threads_hazard_ptr_cnt; void dec_nested_threads_hazard_ptr_cnt() { assert(_nested_threads_hazard_ptr_cnt != 0, "mismatched {dec,inc}_nested_threads_hazard_ptr_cnt()"); _nested_threads_hazard_ptr_cnt--; } void inc_nested_threads_hazard_ptr_cnt() { _nested_threads_hazard_ptr_cnt++; } uint nested_threads_hazard_ptr_cnt() { return _nested_threads_hazard_ptr_cnt; } public: void* operator new(size_t size) throw() { return allocate(size, true); } void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { return allocate(size, false); } void operator delete(void* p); protected: static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); private: // *************************************************************** // Suspend and resume support // *************************************************************** // // VM suspend/resume no longer exists - it was once used for various // things including safepoints but was deprecated and finally removed // in Java 7. Because VM suspension was considered "internal" Java-level // suspension was considered "external", and this legacy naming scheme // remains. // // External suspend/resume requests come from JVM_SuspendThread, // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI // ResumeThread. External // suspend requests cause _external_suspend to be set and external // resume requests cause _external_suspend to be cleared. // External suspend requests do not nest on top of other external // suspend requests. The higher level APIs reject suspend requests // for already suspended threads. // // The external_suspend // flag is checked by has_special_runtime_exit_condition() and java thread // will self-suspend when handle_special_runtime_exit_condition() is // called. Most uses of the _thread_blocked state in JavaThreads are // considered the same as being externally suspended; if the blocking // condition lifts, the JavaThread will self-suspend. Other places // where VM checks for external_suspend include: // + mutex granting (do not enter monitors when thread is suspended) // + state transitions from _thread_in_native // // In general, java_suspend() does not wait for an external suspend // request to complete. When it returns, the only guarantee is that // the _external_suspend field is true. // // wait_for_ext_suspend_completion() is used to wait for an external // suspend request to complete. External suspend requests are usually // followed by some other interface call that requires the thread to // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into // the interface that requires quiescence, we give the JavaThread a // chance to self-suspend before we need it to be quiescent. This // improves overall suspend/query performance. // // _suspend_flags controls the behavior of java_ suspend/resume. // It must be set under the protection of SR_lock. Read from the flag is // OK without SR_lock as long as the value is only used as a hint. // (e.g., check _external_suspend first without lock and then recheck // inside SR_lock and finish the suspension) // // _suspend_flags is also overloaded for other "special conditions" so // that a single check indicates whether any special action is needed // eg. for async exceptions. // ------------------------------------------------------------------- // Notes: // 1. The suspend/resume logic no longer uses ThreadState in OSThread // but we still update its value to keep other part of the system (mainly // JVMTI) happy. ThreadState is legacy code (see notes in // osThread.hpp). // // 2. It would be more natural if set_external_suspend() is private and // part of java_suspend(), but that probably would affect the suspend/query // performance. Need more investigation on this. // suspend/resume lock: used for self-suspend Monitor* _SR_lock; protected: enum SuspendFlags { // NOTE: avoid using the sign-bit as cc generates different test code // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 _external_suspend = 0x20000000U, // thread is asked to self suspend _ext_suspended = 0x40000000U, // thread has self-suspended _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt _has_async_exception = 0x00000001U, // there is a pending async exception _critical_native_unlock = 0x00000002U, // Must call back to unlock JNI critical lock _trace_flag = 0x00000004U // call tracing backend }; // various suspension related flags - atomically updated // overloaded for async exception checking in check_special_condition_for_native_trans. volatile uint32_t _suspend_flags; private: int _num_nested_signal; DEBUG_ONLY(bool _suspendible_thread;) public: void enter_signal_handler() { _num_nested_signal++; } void leave_signal_handler() { _num_nested_signal--; } bool is_inside_signal_handler() const { return _num_nested_signal > 0; } #ifdef ASSERT void set_suspendible_thread() { _suspendible_thread = true; } void clear_suspendible_thread() { _suspendible_thread = false; } bool is_suspendible_thread() { return _suspendible_thread; } #endif private: // Active_handles points to a block of handles JNIHandleBlock* _active_handles; // One-element thread local free list JNIHandleBlock* _free_handle_block; // Point to the last handle mark HandleMark* _last_handle_mark; // The parity of the last strong_roots iteration in which this thread was // claimed as a task. int _oops_do_parity; // Support for GlobalCounter private: volatile uintx _rcu_counter; public: volatile uintx* get_rcu_counter() { return &_rcu_counter; } public: void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } HandleMark* last_handle_mark() const { return _last_handle_mark; } private: // debug support for checking if code does allow safepoints or not // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on // mutex, or blocking on an object synchronizer (Java locking). // If !allow_safepoint(), then an assertion failure will happen in any of the above cases // If !allow_allocation(), then an assertion failure will happen during allocation // (Hence, !allow_safepoint() => !allow_allocation()). // // The two classes NoSafepointVerifier and No_Allocation_Verifier are used to set these counters. // NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. // Used by SkipGCALot class. NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? friend class NoAllocVerifier; friend class NoSafepointVerifier; friend class PauseNoSafepointVerifier; friend class GCLocker; volatile void* _polling_page; // Thread local polling page ThreadLocalAllocBuffer _tlab; // Thread-local eden jlong _allocated_bytes; // Cumulative number of bytes allocated on // the Java heap JFR_ONLY(DEFINE_THREAD_LOCAL_FIELD_JFR;) // Thread-local data for jfr int _vm_operation_started_count; // VM_Operation support int _vm_operation_completed_count; // VM_Operation support ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread // is waiting to lock bool _current_pending_monitor_is_from_java; // locking is from Java code // ObjectMonitor on which this thread called Object.wait() ObjectMonitor* _current_waiting_monitor; // Private thread-local objectmonitor list - a simple cache organized as a SLL. public: ObjectMonitor* omFreeList; int omFreeCount; // length of omFreeList int omFreeProvision; // reload chunk size ObjectMonitor* omInUseList; // SLL to track monitors in circulation int omInUseCount; // length of omInUseList #ifdef ASSERT private: bool _visited_for_critical_count; public: void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } bool was_visited_for_critical_count() const { return _visited_for_critical_count; } #endif public: enum { is_definitely_current_thread = true }; // Constructor Thread(); virtual ~Thread(); // Manage Thread::current() void initialize_thread_current(); void clear_thread_current(); // TLS cleanup needed before threads terminate public: // thread entry point virtual void run(); // Testers virtual bool is_VM_thread() const { return false; } virtual bool is_Java_thread() const { return false; } virtual bool is_Compiler_thread() const { return false; } virtual bool is_Code_cache_sweeper_thread() const { return false; } virtual bool is_hidden_from_external_view() const { return false; } virtual bool is_jvmti_agent_thread() const { return false; } // True iff the thread can perform GC operations at a safepoint. // Generally will be true only of VM thread and parallel GC WorkGang // threads. virtual bool is_GC_task_thread() const { return false; } virtual bool is_Watcher_thread() const { return false; } virtual bool is_ConcurrentGC_thread() const { return false; } virtual bool is_Named_thread() const { return false; } virtual bool is_Worker_thread() const { return false; } // Can this thread make Java upcalls virtual bool can_call_java() const { return false; } // Casts virtual WorkerThread* as_Worker_thread() const { return NULL; } virtual char* name() const { return (char*)"Unknown thread"; } // Returns the current thread (ASSERTS if NULL) static inline Thread* current(); // Returns the current thread, or NULL if not attached static inline Thread* current_or_null(); // Returns the current thread, or NULL if not attached, and is // safe for use from signal-handlers static inline Thread* current_or_null_safe(); // Common thread operations #ifdef ASSERT static void check_for_dangling_thread_pointer(Thread *thread); #endif static void set_priority(Thread* thread, ThreadPriority priority); static ThreadPriority get_priority(const Thread* const thread); static void start(Thread* thread); static void interrupt(Thread* thr); static bool is_interrupted(Thread* thr, bool clear_interrupted); void set_native_thread_name(const char *name) { assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); os::set_native_thread_name(name); } ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } Monitor* SR_lock() const { return _SR_lock; } bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } inline void set_suspend_flag(SuspendFlags f); inline void clear_suspend_flag(SuspendFlags f); inline void set_has_async_exception(); inline void clear_has_async_exception(); bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } inline void set_critical_native_unlock(); inline void clear_critical_native_unlock(); inline void set_trace_flag(); inline void clear_trace_flag(); // Support for Unhandled Oop detection // Add the field for both, fastdebug and debug, builds to keep // Thread's fields layout the same. // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build. #ifdef CHECK_UNHANDLED_OOPS private: UnhandledOops* _unhandled_oops; #elif defined(ASSERT) private: void* _unhandled_oops; #endif #ifdef CHECK_UNHANDLED_OOPS public: UnhandledOops* unhandled_oops() { return _unhandled_oops; } // Mark oop safe for gc. It may be stack allocated but won't move. void allow_unhandled_oop(oop *op) { if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); } // Clear oops at safepoint so crashes point to unhandled oop violator void clear_unhandled_oops() { if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); } #endif // CHECK_UNHANDLED_OOPS public: #ifndef PRODUCT bool skip_gcalot() { return _skip_gcalot; } void set_skip_gcalot(bool v) { _skip_gcalot = v; } #endif // Installs a pending exception to be inserted later static void send_async_exception(oop thread_oop, oop java_throwable); // Resource area ResourceArea* resource_area() const { return _resource_area; } void set_resource_area(ResourceArea* area) { _resource_area = area; } OSThread* osthread() const { return _osthread; } void set_osthread(OSThread* thread) { _osthread = thread; } // JNI handle support JNIHandleBlock* active_handles() const { return _active_handles; } void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } JNIHandleBlock* free_handle_block() const { return _free_handle_block; } void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } // Internal handle support HandleArea* handle_area() const { return _handle_area; } void set_handle_area(HandleArea* area) { _handle_area = area; } GrowableArray* metadata_handles() const { return _metadata_handles; } void set_metadata_handles(GrowableArray* handles){ _metadata_handles = handles; } // Thread-Local Allocation Buffer (TLAB) support ThreadLocalAllocBuffer& tlab() { return _tlab; } void initialize_tlab() { if (UseTLAB) { tlab().initialize(); } } jlong allocated_bytes() { return _allocated_bytes; } void set_allocated_bytes(jlong value) { _allocated_bytes = value; } void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } inline jlong cooked_allocated_bytes(); JFR_ONLY(DEFINE_THREAD_LOCAL_ACCESSOR_JFR;) bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; } // VM operation support int vm_operation_ticket() { return ++_vm_operation_started_count; } int vm_operation_completed_count() { return _vm_operation_completed_count; } void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } // For tracking the heavyweight monitor the thread is pending on. ObjectMonitor* current_pending_monitor() { return _current_pending_monitor; } void set_current_pending_monitor(ObjectMonitor* monitor) { _current_pending_monitor = monitor; } void set_current_pending_monitor_is_from_java(bool from_java) { _current_pending_monitor_is_from_java = from_java; } bool current_pending_monitor_is_from_java() { return _current_pending_monitor_is_from_java; } // For tracking the ObjectMonitor on which this thread called Object.wait() ObjectMonitor* current_waiting_monitor() { return _current_waiting_monitor; } void set_current_waiting_monitor(ObjectMonitor* monitor) { _current_waiting_monitor = monitor; } // GC support // Apply "f->do_oop" to all root oops in "this". // Used by JavaThread::oops_do. // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames virtual void oops_do(OopClosure* f, CodeBlobClosure* cf); // Handles the parallel case for the method below. private: bool claim_oops_do_par_case(int collection_parity); public: // Requires that "collection_parity" is that of the current roots // iteration. If "is_par" is false, sets the parity of "this" to // "collection_parity", and returns "true". If "is_par" is true, // uses an atomic instruction to set the current threads parity to // "collection_parity", if it is not already. Returns "true" iff the // calling thread does the update, this indicates that the calling thread // has claimed the thread's stack as a root groop in the current // collection. bool claim_oops_do(bool is_par, int collection_parity) { if (!is_par) { _oops_do_parity = collection_parity; return true; } else { return claim_oops_do_par_case(collection_parity); } } // jvmtiRedefineClasses support void metadata_handles_do(void f(Metadata*)); // Used by fast lock support virtual bool is_lock_owned(address adr) const; // Check if address is in the stack of the thread (not just for locks). // Warning: the method can only be used on the running thread bool is_in_stack(address adr) const; // Check if address is in the usable part of the stack (excludes protected // guard pages) bool is_in_usable_stack(address adr) const; // Sets this thread as starting thread. Returns failure if thread // creation fails due to lack of memory, too many threads etc. bool set_as_starting_thread(); protected: // OS data associated with the thread OSThread* _osthread; // Platform-specific thread information // Thread local resource area for temporary allocation within the VM ResourceArea* _resource_area; DEBUG_ONLY(ResourceMark* _current_resource_mark;) // Thread local handle area for allocation of handles within the VM HandleArea* _handle_area; GrowableArray* _metadata_handles; // Support for stack overflow handling, get_thread, etc. address _stack_base; size_t _stack_size; uintptr_t _self_raw_id; // used by get_thread (mutable) int _lgrp_id; volatile void** polling_page_addr() { return &_polling_page; } public: // Stack overflow support address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } void set_stack_base(address base) { _stack_base = base; } size_t stack_size() const { return _stack_size; } void set_stack_size(size_t size) { _stack_size = size; } address stack_end() const { return stack_base() - stack_size(); } void record_stack_base_and_size(); bool on_local_stack(address adr) const { // QQQ this has knowledge of direction, ought to be a stack method return (_stack_base >= adr && adr >= stack_end()); } uintptr_t self_raw_id() { return _self_raw_id; } void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } int lgrp_id() const { return _lgrp_id; } void set_lgrp_id(int value) { _lgrp_id = value; } // Printing virtual void print_on(outputStream* st) const; void print() const { print_on(tty); } virtual void print_on_error(outputStream* st, char* buf, int buflen) const; void print_value_on(outputStream* st) const; // Debug-only code #ifdef ASSERT private: // Deadlock detection support for Mutex locks. List of locks own by thread. Monitor* _owned_locks; // Mutex::set_owner_implementation is the only place where _owned_locks is modified, // thus the friendship friend class Mutex; friend class Monitor; public: void print_owned_locks_on(outputStream* st) const; void print_owned_locks() const { print_owned_locks_on(tty); } Monitor* owned_locks() const { return _owned_locks; } bool owns_locks() const { return owned_locks() != NULL; } bool owns_locks_but_compiled_lock() const; int oops_do_parity() const { return _oops_do_parity; } // Deadlock detection bool allow_allocation() { return _allow_allocation_count == 0; } ResourceMark* current_resource_mark() { return _current_resource_mark; } void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } #endif void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; private: volatile int _jvmti_env_iteration_count; public: void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } // Code generation static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); } static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); } static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); } static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); } static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); } static ByteSize polling_page_offset() { return byte_offset_of(Thread, _polling_page); } #define TLAB_FIELD_OFFSET(name) \ static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } TLAB_FIELD_OFFSET(start) TLAB_FIELD_OFFSET(end) TLAB_FIELD_OFFSET(top) TLAB_FIELD_OFFSET(pf_top) TLAB_FIELD_OFFSET(size) // desired_size TLAB_FIELD_OFFSET(refill_waste_limit) TLAB_FIELD_OFFSET(number_of_refills) TLAB_FIELD_OFFSET(fast_refill_waste) TLAB_FIELD_OFFSET(slow_allocations) #undef TLAB_FIELD_OFFSET static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); } JFR_ONLY(DEFINE_THREAD_LOCAL_OFFSET_JFR;) public: volatile intptr_t _Stalled; volatile int _TypeTag; ParkEvent * _ParkEvent; // for synchronized() ParkEvent * _SleepEvent; // for Thread.sleep ParkEvent * _MutexEvent; // for native internal Mutex/Monitor ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease int NativeSyncRecursion; // diagnostic volatile int _OnTrap; // Resume-at IP delta jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG jint _hashStateX; // thread-specific hashCode generator state jint _hashStateY; jint _hashStateZ; void * _schedctl; volatile jint rng[4]; // RNG for spin loop // Low-level leaf-lock primitives used to implement synchronization // and native monitor-mutex infrastructure. // Not for general synchronization use. static void SpinAcquire(volatile int * Lock, const char * Name); static void SpinRelease(volatile int * Lock); static void muxAcquire(volatile intptr_t * Lock, const char * Name); static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev); static void muxRelease(volatile intptr_t * Lock); }; // Inline implementation of Thread::current() inline Thread* Thread::current() { Thread* current = current_or_null(); assert(current != NULL, "Thread::current() called on detached thread"); return current; } inline Thread* Thread::current_or_null() { #ifndef USE_LIBRARY_BASED_TLS_ONLY return _thr_current; #else if (ThreadLocalStorage::is_initialized()) { return ThreadLocalStorage::thread(); } return NULL; #endif } inline Thread* Thread::current_or_null_safe() { if (ThreadLocalStorage::is_initialized()) { return ThreadLocalStorage::thread(); } return NULL; } // Name support for threads. non-JavaThread subclasses with multiple // uniquely named instances should derive from this. class NamedThread: public Thread { friend class VMStructs; enum { max_name_len = 64 }; private: char* _name; // log JavaThread being processed by oops_do JavaThread* _processed_thread; uint _gc_id; // The current GC id when a thread takes part in GC public: NamedThread(); ~NamedThread(); // May only be called once per thread. void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); void initialize_named_thread(); virtual bool is_Named_thread() const { return true; } virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } JavaThread *processed_thread() { return _processed_thread; } void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } virtual void print_on(outputStream* st) const; void set_gc_id(uint gc_id) { _gc_id = gc_id; } uint gc_id() { return _gc_id; } }; // Worker threads are named and have an id of an assigned work. class WorkerThread: public NamedThread { private: uint _id; public: WorkerThread() : _id(0) { } virtual bool is_Worker_thread() const { return true; } virtual WorkerThread* as_Worker_thread() const { assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); return (WorkerThread*) this; } void set_id(uint work_id) { _id = work_id; } uint id() const { return _id; } }; // A single WatcherThread is used for simulating timer interrupts. class WatcherThread: public Thread { friend class VMStructs; public: virtual void run(); private: static WatcherThread* _watcher_thread; static bool _startable; // volatile due to at least one lock-free read volatile static bool _should_terminate; public: enum SomeConstants { delay_interval = 10 // interrupt delay in milliseconds }; // Constructor WatcherThread(); // No destruction allowed ~WatcherThread() { guarantee(false, "WatcherThread deletion must fix the race with VM termination"); } // Tester bool is_Watcher_thread() const { return true; } // Printing char* name() const { return (char*)"VM Periodic Task Thread"; } void print_on(outputStream* st) const; void unpark(); // Returns the single instance of WatcherThread static WatcherThread* watcher_thread() { return _watcher_thread; } // Create and start the single instance of WatcherThread, or stop it on shutdown static void start(); static void stop(); // Only allow start once the VM is sufficiently initialized // Otherwise the first task to enroll will trigger the start static void make_startable(); private: int sleep() const; }; class CompilerThread; typedef void (*ThreadFunction)(JavaThread*, TRAPS); class JavaThread: public Thread { friend class VMStructs; friend class JVMCIVMStructs; friend class WhiteBox; private: JavaThread* _next; // The next thread in the Threads list bool _on_thread_list; // Is set when this JavaThread is added to the Threads list oop _threadObj; // The Java level thread object #ifdef ASSERT private: int _java_call_counter; public: int java_call_counter() { return _java_call_counter; } void inc_java_call_counter() { _java_call_counter++; } void dec_java_call_counter() { assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); _java_call_counter--; } private: // restore original namespace restriction #endif // ifdef ASSERT #ifndef PRODUCT public: enum { jump_ring_buffer_size = 16 }; private: // restore original namespace restriction #endif JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state ThreadFunction _entry_point; JNIEnv _jni_environment; // Deopt support DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we // transition out of native CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays vframeArray* _vframe_array_last; // Holds last vFrameArray we popped // Because deoptimization is lazy we must save jvmti requests to set locals // in compiled frames until we deoptimize and we have an interpreter frame. // This holds the pointer to array (yeah like there might be more than one) of // description of compiled vframes that have locals that need to be updated. GrowableArray* _deferred_locals_updates; // Handshake value for fixing 6243940. We need a place for the i2c // adapter to store the callee Method*. This value is NEVER live // across a gc point so it does NOT have to be gc'd // The handshake is open ended since we can't be certain that it will // be NULLed. This is because we rarely ever see the race and end up // in handle_wrong_method which is the backend of the handshake. See // code in i2c adapters and handle_wrong_method. Method* _callee_target; // Used to pass back results to the interpreter or generated code running Java code. oop _vm_result; // oop result is GC-preserved Metadata* _vm_result_2; // non-oop result // See ReduceInitialCardMarks: this holds the precise space interval of // the most recent slow path allocation for which compiled code has // elided card-marks for performance along the fast-path. MemRegion _deferred_card_mark; MonitorChunk* _monitor_chunks; // Contains the off stack monitors // allocated during deoptimization // and by JNI_MonitorEnter/Exit // Async. requests support enum AsyncRequests { _no_async_condition = 0, _async_exception, _async_unsafe_access_error }; AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request oop _pending_async_exception; // Safepoint support public: // Expose _thread_state for SafeFetchInt() volatile JavaThreadState _thread_state; private: ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened // JavaThread termination support enum TerminatedTypes { _not_terminated = 0xDEAD - 2, _thread_exiting, // JavaThread::exit() has been called for this thread _thread_terminated, // JavaThread is removed from thread list _vm_exited // JavaThread is still executing native code, but VM is terminated // only VM_Exit can set _vm_exited }; // In general a JavaThread's _terminated field transitions as follows: // // _not_terminated => _thread_exiting => _thread_terminated // // _vm_exited is a special value to cover the case of a JavaThread // executing native code after the VM itself is terminated. volatile TerminatedTypes _terminated; // suspend/resume support volatile bool _suspend_equivalent; // Suspend equivalent condition jint _in_deopt_handler; // count of deoptimization // handlers thread is in volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was // never locked) when throwing an exception. Used by interpreter only. // JNI attach states: enum JNIAttachStates { _not_attaching_via_jni = 1, // thread is not attaching via JNI _attaching_via_jni, // thread is attaching via JNI _attached_via_jni // thread has attached via JNI }; // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. // A native thread that is attaching via JNI starts with a value // of _attaching_via_jni and transitions to _attached_via_jni. volatile JNIAttachStates _jni_attach_state; public: DEBUG_ONLY(oopDesc* _continuation;) // State of the stack guard pages for this thread. enum StackGuardState { stack_guard_unused, // not needed stack_guard_reserved_disabled, stack_guard_yellow_reserved_disabled,// disabled (temporarily) after stack overflow stack_guard_enabled // enabled }; private: #if INCLUDE_JVMCI // The _pending_* fields below are used to communicate extra information // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. // Communicates the DeoptReason and DeoptAction of the uncommon trap int _pending_deoptimization; // Specifies whether the uncommon trap is to bci 0 of a synchronized method // before the monitor has been acquired. bool _pending_monitorenter; // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter bool _pending_transfer_to_interpreter; // Guard for re-entrant call to JVMCIRuntime::adjust_comp_level bool _adjusting_comp_level; // An object that JVMCI compiled code can use to further describe and // uniquely identify the speculative optimization guarded by the uncommon trap oop _pending_failed_speculation; // These fields are mutually exclusive in terms of live ranges. union { // Communicates the pc at which the most recent implicit exception occurred // from the signal handler to a deoptimization stub. address _implicit_exception_pc; // Communicates an alternative call target to an i2c stub from a JavaCall . address _alternate_call_target; } _jvmci; // Support for high precision, thread sensitive counters in JVMCI compiled code. jlong* _jvmci_counters; public: static jlong* _jvmci_old_thread_counters; static void collect_counters(typeArrayOop array); private: #endif // INCLUDE_JVMCI StackGuardState _stack_guard_state; // Precompute the limit of the stack as used in stack overflow checks. // We load it from here to simplify the stack overflow check in assembly. address _stack_overflow_limit; address _reserved_stack_activation; // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is // used to temp. parsing values into and out of the runtime system during exception handling for compiled // code) volatile oop _exception_oop; // Exception thrown in compiled code volatile address _exception_pc; // PC where exception happened volatile address _exception_handler_pc; // PC for handler of exception volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. private: // support for JNI critical regions jint _jni_active_critical; // count of entries into JNI critical region // Checked JNI: function name requires exception check char* _pending_jni_exception_check_fn; // For deadlock detection. int _depth_first_number; // JVMTI PopFrame support // This is set to popframe_pending to signal that top Java frame should be popped immediately int _popframe_condition; // If reallocation of scalar replaced objects fails, we throw OOM // and during exception propagation, pop the top // _frames_to_pop_failed_realloc frames, the ones that reference // failed reallocations. int _frames_to_pop_failed_realloc; #ifndef PRODUCT int _jmp_ring_index; struct { // We use intptr_t instead of address so debugger doesn't try and display strings intptr_t _target; intptr_t _instruction; const char* _file; int _line; } _jmp_ring[jump_ring_buffer_size]; #endif // PRODUCT friend class VMThread; friend class ThreadWaitTransition; friend class VM_Exit; void initialize(); // Initialized the instance variables public: // Constructor JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads JavaThread(ThreadFunction entry_point, size_t stack_size = 0); ~JavaThread(); #ifdef ASSERT // verify this JavaThread hasn't be published in the Threads::list yet void verify_not_published(); #endif //JNI functiontable getter/setter for JVMTI jni function table interception API. void set_jni_functions(struct JNINativeInterface_* functionTable) { _jni_environment.functions = functionTable; } struct JNINativeInterface_* get_jni_functions() { return (struct JNINativeInterface_ *)_jni_environment.functions; } // This function is called at thread creation to allow // platform specific thread variables to be initialized. void cache_global_variables(); // Executes Shutdown.shutdown() void invoke_shutdown_hooks(); // Cleanup on thread exit enum ExitType { normal_exit, jni_detach }; void exit(bool destroy_vm, ExitType exit_type = normal_exit); void cleanup_failed_attach_current_thread(); // Testers virtual bool is_Java_thread() const { return true; } virtual bool can_call_java() const { return true; } // Thread chain operations JavaThread* next() const { return _next; } void set_next(JavaThread* p) { _next = p; } // Thread oop. threadObj() can be NULL for initial JavaThread // (or for threads attached via JNI) oop threadObj() const { return _threadObj; } void set_threadObj(oop p) { _threadObj = p; } ThreadPriority java_priority() const; // Read from threadObj() // Prepare thread and add to priority queue. If a priority is // not specified, use the priority of the thread object. Threads_lock // must be held while this function is called. void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } address saved_exception_pc() { return _saved_exception_pc; } ThreadFunction entry_point() const { return _entry_point; } // Allocates a new Java level thread object for this thread. thread_name may be NULL. void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS); // Last frame anchor routines JavaFrameAnchor* frame_anchor(void) { return &_anchor; } // last_Java_sp bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } // last_Java_pc address last_Java_pc(void) { return _anchor.last_Java_pc(); } // Safepoint support #if !(defined(PPC64) || defined(AARCH64)) JavaThreadState thread_state() const { return _thread_state; } void set_thread_state(JavaThreadState s) { _thread_state = s; } #else // Use membars when accessing volatile _thread_state. See // Threads::create_vm() for size checks. inline JavaThreadState thread_state() const; inline void set_thread_state(JavaThreadState s); #endif ThreadSafepointState *safepoint_state() const { return _safepoint_state; } void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } // JavaThread termination and lifecycle support: void smr_delete(); bool on_thread_list() const { return _on_thread_list; } void set_on_thread_list() { _on_thread_list = true; } // thread has called JavaThread::exit() or is terminated bool is_exiting() const; // thread is terminated (no longer on the threads list); we compare // against the two non-terminated values so that a freed JavaThread // will also be considered terminated. bool check_is_terminated(TerminatedTypes l_terminated) const { return l_terminated != _not_terminated && l_terminated != _thread_exiting; } bool is_terminated() const; void set_terminated(TerminatedTypes t); // special for Threads::remove() which is static: void set_terminated_value(); void block_if_vm_exited(); bool doing_unsafe_access() { return _doing_unsafe_access; } void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } inline void set_polling_page(void* poll_value); inline volatile void* get_polling_page(); private: // Support for thread handshake operations HandshakeState _handshake; public: void set_handshake_operation(HandshakeOperation* op) { _handshake.set_operation(this, op); } bool has_handshake() const { return _handshake.has_operation(); } void cancel_handshake() { _handshake.cancel(this); } void handshake_process_by_self() { _handshake.process_by_self(this); } void handshake_process_by_vmthread() { _handshake.process_by_vmthread(this); } // Suspend/resume support for JavaThread private: inline void set_ext_suspended(); inline void clear_ext_suspended(); public: void java_suspend(); void java_resume(); int java_suspend_self(); void check_and_wait_while_suspended() { assert(JavaThread::current() == this, "sanity check"); bool do_self_suspend; do { // were we externally suspended while we were waiting? do_self_suspend = handle_special_suspend_equivalent_condition(); if (do_self_suspend) { // don't surprise the thread that suspended us by returning java_suspend_self(); set_suspend_equivalent(); } } while (do_self_suspend); } static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); // Check for async exception in addition to safepoint and suspend request. static void check_special_condition_for_native_trans(JavaThread *thread); // Same as check_special_condition_for_native_trans but finishes the // transition into thread_in_Java mode so that it can potentially // block. static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); bool is_ext_suspend_completed_with_lock(uint32_t *bits) { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); // Warning: is_ext_suspend_completed() may temporarily drop the // SR_lock to allow the thread to reach a stable thread state if // it is currently in a transient thread state. return is_ext_suspend_completed(false /* !called_by_wait */, SuspendRetryDelay, bits); } // We cannot allow wait_for_ext_suspend_completion() to run forever or // we could hang. SuspendRetryCount and SuspendRetryDelay are normally // passed as the count and delay parameters. Experiments with specific // calls to wait_for_ext_suspend_completion() can be done by passing // other values in the code. Experiments with all calls can be done // via the appropriate -XX options. bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); // test for suspend - most (all?) of these should go away bool is_thread_fully_suspended(bool wait_for_suspend, uint32_t *bits); inline void set_external_suspend(); inline void clear_external_suspend(); inline void set_deopt_suspend(); inline void clear_deopt_suspend(); bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } bool is_external_suspend() const { return (_suspend_flags & _external_suspend) != 0; } // Whenever a thread transitions from native to vm/java it must suspend // if external|deopt suspend is present. bool is_suspend_after_native() const { return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0; } // external suspend request is completed bool is_ext_suspended() const { return (_suspend_flags & _ext_suspended) != 0; } bool is_external_suspend_with_lock() const { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); return is_external_suspend(); } // Special method to handle a pending external suspend request // when a suspend equivalent condition lifts. bool handle_special_suspend_equivalent_condition() { assert(is_suspend_equivalent(), "should only be called in a suspend equivalence condition"); MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); bool ret = is_external_suspend(); if (!ret) { // not about to self-suspend so clear suspend equivalence clear_suspend_equivalent(); } // implied else: // We have a pending external suspend request so we leave the // suspend_equivalent flag set until java_suspend_self() sets // the ext_suspended flag and clears the suspend_equivalent // flag. This insures that wait_for_ext_suspend_completion() // will return consistent values. return ret; } // utility methods to see if we are doing some kind of suspension bool is_being_ext_suspended() const { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); return is_ext_suspended() || is_external_suspend(); } bool is_suspend_equivalent() const { return _suspend_equivalent; } void set_suspend_equivalent() { _suspend_equivalent = true; } void clear_suspend_equivalent() { _suspend_equivalent = false; } // Thread.stop support void send_thread_stop(oop throwable); AsyncRequests clear_special_runtime_exit_condition() { AsyncRequests x = _special_runtime_exit_condition; _special_runtime_exit_condition = _no_async_condition; return x; } // Are any async conditions present? bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } void check_and_handle_async_exceptions(bool check_unsafe_error = true); // these next two are also used for self-suspension and async exception support void handle_special_runtime_exit_condition(bool check_asyncs = true); // Return true if JavaThread has an asynchronous condition or // if external suspension is requested. bool has_special_runtime_exit_condition() { // Because we don't use is_external_suspend_with_lock // it is possible that we won't see an asynchronous external suspend // request that has just gotten started, i.e., SR_lock grabbed but // _external_suspend field change either not made yet or not visible // yet. However, this is okay because the request is asynchronous and // we will see the new flag value the next time through. It's also // possible that the external suspend request is dropped after // we have checked is_external_suspend(), we will recheck its value // under SR_lock in java_suspend_self(). return (_special_runtime_exit_condition != _no_async_condition) || is_external_suspend() || is_trace_suspend(); } void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } inline void set_pending_async_exception(oop e); // Fast-locking support bool is_lock_owned(address adr) const; // Accessors for vframe array top // The linked list of vframe arrays are sorted on sp. This means when we // unpack the head must contain the vframe array to unpack. void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } vframeArray* vframe_array_head() const { return _vframe_array_head; } // Side structure for deferring update of java frame locals until deopt occurs GrowableArray* deferred_locals() const { return _deferred_locals_updates; } void set_deferred_locals(GrowableArray* vf) { _deferred_locals_updates = vf; } // These only really exist to make debugging deopt problems simpler void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } vframeArray* vframe_array_last() const { return _vframe_array_last; } // The special resourceMark used during deoptimization void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } intptr_t* must_deopt_id() { return _must_deopt_id; } void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } void clear_must_deopt_id() { _must_deopt_id = NULL; } void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; } CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; } Method* callee_target() const { return _callee_target; } void set_callee_target (Method* x) { _callee_target = x; } // Oop results of vm runtime calls oop vm_result() const { return _vm_result; } void set_vm_result (oop x) { _vm_result = x; } Metadata* vm_result_2() const { return _vm_result_2; } void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } MemRegion deferred_card_mark() const { return _deferred_card_mark; } void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } #if INCLUDE_JVMCI int pending_deoptimization() const { return _pending_deoptimization; } oop pending_failed_speculation() const { return _pending_failed_speculation; } bool adjusting_comp_level() const { return _adjusting_comp_level; } void set_adjusting_comp_level(bool b) { _adjusting_comp_level = b; } bool has_pending_monitorenter() const { return _pending_monitorenter; } void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; } void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; } void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; } #endif // INCLUDE_JVMCI // Exception handling for compiled methods oop exception_oop() const { return _exception_oop; } address exception_pc() const { return _exception_pc; } address exception_handler_pc() const { return _exception_handler_pc; } bool is_method_handle_return() const { return _is_method_handle_return == 1; } void set_exception_oop(oop o) { (void)const_cast(_exception_oop = o); } void set_exception_pc(address a) { _exception_pc = a; } void set_exception_handler_pc(address a) { _exception_handler_pc = a; } void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } void clear_exception_oop_and_pc() { set_exception_oop(NULL); set_exception_pc(NULL); } // Stack overflow support // // (small addresses) // // -- <-- stack_end() --- // | | // | red pages | // | | // -- <-- stack_red_zone_base() | // | | // | guard // | yellow pages zone // | | // | | // -- <-- stack_yellow_zone_base() | // | | // | | // | reserved pages | // | | // -- <-- stack_reserved_zone_base() --- --- // /|\ shadow <-- stack_overflow_limit() (somewhere in here) // | zone // \|/ size // some untouched memory --- // // // -- // | // | shadow zone // | // -- // x frame n // -- // x frame n-1 // x // -- // ... // // -- // x frame 0 // -- <-- stack_base() // // (large addresses) // private: // These values are derived from flags StackRedPages, StackYellowPages, // StackReservedPages and StackShadowPages. The zone size is determined // ergonomically if page_size > 4K. static size_t _stack_red_zone_size; static size_t _stack_yellow_zone_size; static size_t _stack_reserved_zone_size; static size_t _stack_shadow_zone_size; public: inline size_t stack_available(address cur_sp); static size_t stack_red_zone_size() { assert(_stack_red_zone_size > 0, "Don't call this before the field is initialized."); return _stack_red_zone_size; } static void set_stack_red_zone_size(size_t s) { assert(is_aligned(s, os::vm_page_size()), "We can not protect if the red zone size is not page aligned."); assert(_stack_red_zone_size == 0, "This should be called only once."); _stack_red_zone_size = s; } address stack_red_zone_base() { return (address)(stack_end() + stack_red_zone_size()); } bool in_stack_red_zone(address a) { return a <= stack_red_zone_base() && a >= stack_end(); } static size_t stack_yellow_zone_size() { assert(_stack_yellow_zone_size > 0, "Don't call this before the field is initialized."); return _stack_yellow_zone_size; } static void set_stack_yellow_zone_size(size_t s) { assert(is_aligned(s, os::vm_page_size()), "We can not protect if the yellow zone size is not page aligned."); assert(_stack_yellow_zone_size == 0, "This should be called only once."); _stack_yellow_zone_size = s; } static size_t stack_reserved_zone_size() { // _stack_reserved_zone_size may be 0. This indicates the feature is off. return _stack_reserved_zone_size; } static void set_stack_reserved_zone_size(size_t s) { assert(is_aligned(s, os::vm_page_size()), "We can not protect if the reserved zone size is not page aligned."); assert(_stack_reserved_zone_size == 0, "This should be called only once."); _stack_reserved_zone_size = s; } address stack_reserved_zone_base() { return (address)(stack_end() + (stack_red_zone_size() + stack_yellow_zone_size() + stack_reserved_zone_size())); } bool in_stack_reserved_zone(address a) { return (a <= stack_reserved_zone_base()) && (a >= (address)((intptr_t)stack_reserved_zone_base() - stack_reserved_zone_size())); } static size_t stack_yellow_reserved_zone_size() { return _stack_yellow_zone_size + _stack_reserved_zone_size; } bool in_stack_yellow_reserved_zone(address a) { return (a <= stack_reserved_zone_base()) && (a >= stack_red_zone_base()); } // Size of red + yellow + reserved zones. static size_t stack_guard_zone_size() { return stack_red_zone_size() + stack_yellow_reserved_zone_size(); } static size_t stack_shadow_zone_size() { assert(_stack_shadow_zone_size > 0, "Don't call this before the field is initialized."); return _stack_shadow_zone_size; } static void set_stack_shadow_zone_size(size_t s) { // The shadow area is not allocated or protected, so // it needs not be page aligned. // But the stack bang currently assumes that it is a // multiple of page size. This guarantees that the bang // loop touches all pages in the shadow zone. // This can be guaranteed differently, as well. E.g., if // the page size is a multiple of 4K, banging in 4K steps // suffices to touch all pages. (Some pages are banged // several times, though.) assert(is_aligned(s, os::vm_page_size()), "Stack bang assumes multiple of page size."); assert(_stack_shadow_zone_size == 0, "This should be called only once."); _stack_shadow_zone_size = s; } void create_stack_guard_pages(); void remove_stack_guard_pages(); void enable_stack_reserved_zone(); void disable_stack_reserved_zone(); void enable_stack_yellow_reserved_zone(); void disable_stack_yellow_reserved_zone(); void enable_stack_red_zone(); void disable_stack_red_zone(); inline bool stack_guard_zone_unused(); inline bool stack_yellow_reserved_zone_disabled(); inline bool stack_reserved_zone_disabled(); inline bool stack_guards_enabled(); address reserved_stack_activation() const { return _reserved_stack_activation; } void set_reserved_stack_activation(address addr) { assert(_reserved_stack_activation == stack_base() || _reserved_stack_activation == NULL || addr == stack_base(), "Must not be set twice"); _reserved_stack_activation = addr; } // Attempt to reguard the stack after a stack overflow may have occurred. // Returns true if (a) guard pages are not needed on this thread, (b) the // pages are already guarded, or (c) the pages were successfully reguarded. // Returns false if there is not enough stack space to reguard the pages, in // which case the caller should unwind a frame and try again. The argument // should be the caller's (approximate) sp. bool reguard_stack(address cur_sp); // Similar to above but see if current stackpoint is out of the guard area // and reguard if possible. bool reguard_stack(void); address stack_overflow_limit() { return _stack_overflow_limit; } void set_stack_overflow_limit() { _stack_overflow_limit = stack_end() + MAX2(JavaThread::stack_guard_zone_size(), JavaThread::stack_shadow_zone_size()); } // Misc. accessors/mutators void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } #ifndef PRODUCT void record_jump(address target, address instr, const char* file, int line); #endif // PRODUCT // For assembly stub generation static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } #ifndef PRODUCT static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); } static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); } #endif // PRODUCT static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } static ByteSize pending_jni_exception_check_fn_offset() { return byte_offset_of(JavaThread, _pending_jni_exception_check_fn); } static ByteSize last_Java_sp_offset() { return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); } static ByteSize last_Java_pc_offset() { return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); } static ByteSize frame_anchor_offset() { return byte_offset_of(JavaThread, _anchor); } static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } DEBUG_ONLY(static ByteSize continuation_offset() { return byte_offset_of(JavaThread, _continuation); }) #if INCLUDE_JVMCI static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); } static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); } static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); } static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); } static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); } static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); } #endif // INCLUDE_JVMCI static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); } static ByteSize reserved_stack_activation_offset() { return byte_offset_of(JavaThread, _reserved_stack_activation); } static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } static ByteSize should_post_on_exceptions_flag_offset() { return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); } // Returns the jni environment for this thread JNIEnv* jni_environment() { return &_jni_environment; } static JavaThread* thread_from_jni_environment(JNIEnv* env) { JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); // Only return NULL if thread is off the thread list; starting to // exit should not return NULL. if (thread_from_jni_env->is_terminated()) { thread_from_jni_env->block_if_vm_exited(); return NULL; } else { return thread_from_jni_env; } } // JNI critical regions. These can nest. bool in_critical() { return _jni_active_critical > 0; } bool in_last_critical() { return _jni_active_critical == 1; } void enter_critical() { assert(Thread::current() == this || (Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing()), "this must be current thread or synchronizing"); _jni_active_critical++; } void exit_critical() { assert(Thread::current() == this, "this must be current thread"); _jni_active_critical--; assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); } // Checked JNI: is the programmer required to check for exceptions, if so specify // which function name. Returning to a Java frame should implicitly clear the // pending check, this is done for Native->Java transitions (i.e. user JNI code). // VM->Java transistions are not cleared, it is expected that JNI code enclosed // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal). bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } // For deadlock detection int depth_first_number() { return _depth_first_number; } void set_depth_first_number(int dfn) { _depth_first_number = dfn; } private: void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } public: MonitorChunk* monitor_chunks() const { return _monitor_chunks; } void add_monitor_chunk(MonitorChunk* chunk); void remove_monitor_chunk(MonitorChunk* chunk); bool in_deopt_handler() const { return _in_deopt_handler > 0; } void inc_in_deopt_handler() { _in_deopt_handler++; } void dec_in_deopt_handler() { assert(_in_deopt_handler > 0, "mismatched deopt nesting"); if (_in_deopt_handler > 0) { // robustness _in_deopt_handler--; } } private: void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } public: // Frame iteration; calls the function f for all frames on the stack void frames_do(void f(frame*, const RegisterMap*)); // Memory operations void oops_do(OopClosure* f, CodeBlobClosure* cf); // Sweeper operations virtual void nmethods_do(CodeBlobClosure* cf); // RedefineClasses Support void metadata_do(void f(Metadata*)); // Misc. operations char* name() const { return (char*)get_thread_name(); } void print_on(outputStream* st) const; void print_value(); void print_thread_state_on(outputStream*) const PRODUCT_RETURN; void print_thread_state() const PRODUCT_RETURN; void print_on_error(outputStream* st, char* buf, int buflen) const; void print_name_on_error(outputStream* st, char* buf, int buflen) const; void verify(); const char* get_thread_name() const; private: // factor out low-level mechanics for use in both normal and error cases const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; public: const char* get_threadgroup_name() const; const char* get_parent_name() const; // Accessing frames frame last_frame() { _anchor.make_walkable(this); return pd_last_frame(); } javaVFrame* last_java_vframe(RegisterMap* reg_map); // Returns method at 'depth' java or native frames down the stack // Used for security checks Klass* security_get_caller_class(int depth); // Print stack trace in external format void print_stack_on(outputStream* st); void print_stack() { print_stack_on(tty); } // Print stack traces in various internal formats void trace_stack() PRODUCT_RETURN; void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; void trace_frames() PRODUCT_RETURN; void trace_oops() PRODUCT_RETURN; // Print an annotated view of the stack frames void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; void validate_frame_layout() { print_frame_layout(0, true); } // Returns the number of stack frames on the stack int depth() const; // Function for testing deoptimization void deoptimize(); void make_zombies(); void deoptimized_wrt_marked_nmethods(); public: // Returns the running thread as a JavaThread static inline JavaThread* current(); // Returns the active Java thread. Do not use this if you know you are calling // from a JavaThread, as it's slower than JavaThread::current. If called from // the VMThread, it also returns the JavaThread that instigated the VMThread's // operation. You may not want that either. static JavaThread* active(); inline CompilerThread* as_CompilerThread(); public: virtual void run(); void thread_main_inner(); private: // PRIVILEGED STACK PrivilegedElement* _privileged_stack_top; GrowableArray* _array_for_gc; public: // Returns the privileged_stack information. PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } void register_array_for_gc(GrowableArray* array) { _array_for_gc = array; } public: // Thread local information maintained by JVMTI. void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() // getter is used to get this JavaThread's JvmtiThreadState if it has // one which means NULL can be returned. JvmtiThreadState::state_for() // is used to get the specified JavaThread's JvmtiThreadState if it has // one or it allocates a new JvmtiThreadState for the JavaThread and // returns it. JvmtiThreadState::state_for() will return NULL only if // the specified JavaThread is exiting. JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } // JVMTI PopFrame support // Setting and clearing popframe_condition // All of these enumerated values are bits. popframe_pending // indicates that a PopFrame() has been requested and not yet been // completed. popframe_processing indicates that that PopFrame() is in // the process of being completed. popframe_force_deopt_reexecution_bit // indicates that special handling is required when returning to a // deoptimized caller. enum PopCondition { popframe_inactive = 0x00, popframe_pending_bit = 0x01, popframe_processing_bit = 0x02, popframe_force_deopt_reexecution_bit = 0x04 }; PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } void set_popframe_condition(PopCondition c) { _popframe_condition = c; } void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } void clear_popframe_condition() { _popframe_condition = popframe_inactive; } static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } #ifdef CC_INTERP bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } #endif int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } private: // Saved incoming arguments to popped frame. // Used only when popped interpreted frame returns to deoptimized frame. void* _popframe_preserved_args; int _popframe_preserved_args_size; public: void popframe_preserve_args(ByteSize size_in_bytes, void* start); void* popframe_preserved_args(); ByteSize popframe_preserved_args_size(); WordSize popframe_preserved_args_size_in_words(); void popframe_free_preserved_args(); private: JvmtiThreadState *_jvmti_thread_state; JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; // Used by the interpreter in fullspeed mode for frame pop, method // entry, method exit and single stepping support. This field is // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. // It can be set to zero asynchronously (i.e., without a VM operation // or a lock) so we have to be very careful. int _interp_only_mode; public: // used by the interpreter for fullspeed debugging support (see above) static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } bool is_interp_only_mode() { return (_interp_only_mode != 0); } int get_interp_only_mode() { return _interp_only_mode; } void increment_interp_only_mode() { ++_interp_only_mode; } void decrement_interp_only_mode() { --_interp_only_mode; } // support for cached flag that indicates whether exceptions need to be posted for this thread // if this is false, we can avoid deoptimizing when events are thrown // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything private: int _should_post_on_exceptions_flag; public: int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } private: ThreadStatistics *_thread_stat; public: ThreadStatistics* get_thread_stat() const { return _thread_stat; } // Return a blocker object for which this thread is blocked parking. oop current_park_blocker(); private: static size_t _stack_size_at_create; public: static inline size_t stack_size_at_create(void) { return _stack_size_at_create; } static inline void set_stack_size_at_create(size_t value) { _stack_size_at_create = value; } // Machine dependent stuff #include OS_CPU_HEADER(thread) public: void set_blocked_on_compilation(bool value) { _blocked_on_compilation = value; } bool blocked_on_compilation() { return _blocked_on_compilation; } protected: bool _blocked_on_compilation; // JSR166 per-thread parker private: Parker* _parker; public: Parker* parker() { return _parker; } // Biased locking support private: GrowableArray* _cached_monitor_info; public: GrowableArray* cached_monitor_info() { return _cached_monitor_info; } void set_cached_monitor_info(GrowableArray* info) { _cached_monitor_info = info; } // clearing/querying jni attach status bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } inline void set_done_attaching_via_jni(); }; // Inline implementation of JavaThread::current inline JavaThread* JavaThread::current() { Thread* thread = Thread::current(); assert(thread->is_Java_thread(), "just checking"); return (JavaThread*)thread; } inline CompilerThread* JavaThread::as_CompilerThread() { assert(is_Compiler_thread(), "just checking"); return (CompilerThread*)this; } // Dedicated thread to sweep the code cache class CodeCacheSweeperThread : public JavaThread { CompiledMethod* _scanned_compiled_method; // nmethod being scanned by the sweeper public: CodeCacheSweeperThread(); // Track the nmethod currently being scanned by the sweeper void set_scanned_compiled_method(CompiledMethod* cm) { assert(_scanned_compiled_method == NULL || cm == NULL, "should reset to NULL before writing a new value"); _scanned_compiled_method = cm; } // Hide sweeper thread from external view. bool is_hidden_from_external_view() const { return true; } bool is_Code_cache_sweeper_thread() const { return true; } // Prevent GC from unloading _scanned_compiled_method void oops_do(OopClosure* f, CodeBlobClosure* cf); void nmethods_do(CodeBlobClosure* cf); }; // A thread used for Compilation. class CompilerThread : public JavaThread { friend class VMStructs; private: CompilerCounters* _counters; ciEnv* _env; CompileLog* _log; CompileTask* volatile _task; // print_threads_compiling can read this concurrently. CompileQueue* _queue; BufferBlob* _buffer_blob; AbstractCompiler* _compiler; TimeStamp _idle_time; public: static CompilerThread* current(); CompilerThread(CompileQueue* queue, CompilerCounters* counters); ~CompilerThread(); bool is_Compiler_thread() const { return true; } virtual bool can_call_java() const; // Hide native compiler threads from external view. bool is_hidden_from_external_view() const { return !can_call_java(); } void set_compiler(AbstractCompiler* c) { _compiler = c; } AbstractCompiler* compiler() const { return _compiler; } CompileQueue* queue() const { return _queue; } CompilerCounters* counters() const { return _counters; } // Get/set the thread's compilation environment. ciEnv* env() { return _env; } void set_env(ciEnv* env) { _env = env; } BufferBlob* get_buffer_blob() const { return _buffer_blob; } void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; } // Get/set the thread's logging information CompileLog* log() { return _log; } void init_log(CompileLog* log) { // Set once, for good. assert(_log == NULL, "set only once"); _log = log; } void start_idle_timer() { _idle_time.update(); } jlong idle_time_millis() { return TimeHelper::counter_to_millis(_idle_time.ticks_since_update()); } #ifndef PRODUCT private: IdealGraphPrinter *_ideal_graph_printer; public: IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } #endif // Get/set the thread's current task CompileTask* task() { return _task; } void set_task(CompileTask* task) { _task = task; } }; inline CompilerThread* CompilerThread::current() { return JavaThread::current()->as_CompilerThread(); } // The active thread queue. It also keeps track of the current used // thread priorities. class Threads: AllStatic { friend class VMStructs; private: static JavaThread* _thread_list; static int _number_of_threads; static int _number_of_non_daemon_threads; static int _return_code; static int _thread_claim_parity; #ifdef ASSERT static bool _vm_complete; #endif static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS); static void initialize_jsr292_core_classes(TRAPS); public: // Thread management // force_daemon is a concession to JNI, where we may need to add a // thread to the thread list before allocating its thread object static void add(JavaThread* p, bool force_daemon = false); static void remove(JavaThread* p); static void non_java_threads_do(ThreadClosure* tc); static void java_threads_do(ThreadClosure* tc); static void java_threads_and_vm_thread_do(ThreadClosure* tc); static void threads_do(ThreadClosure* tc); static void possibly_parallel_threads_do(bool is_par, ThreadClosure* tc); // Initializes the vm and creates the vm thread static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); static void convert_vm_init_libraries_to_agents(); static void create_vm_init_libraries(); static void create_vm_init_agents(); static void shutdown_vm_agents(); static bool destroy_vm(); // Supported VM versions via JNI // Includes JNI_VERSION_1_1 static jboolean is_supported_jni_version_including_1_1(jint version); // Does not include JNI_VERSION_1_1 static jboolean is_supported_jni_version(jint version); // The "thread claim parity" provides a way for threads to be claimed // by parallel worker tasks. // // Each thread contains a a "parity" field. A task will claim the // thread only if its parity field is the same as the global parity, // which is updated by calling change_thread_claim_parity(). // // For this to work change_thread_claim_parity() needs to be called // exactly once in sequential code before starting parallel tasks // that should claim threads. // // New threads get their parity set to 0 and change_thread_claim_parity() // never set the global parity to 0. static int thread_claim_parity() { return _thread_claim_parity; } static void change_thread_claim_parity(); static void assert_all_threads_claimed() NOT_DEBUG_RETURN; // Apply "f->do_oop" to all root oops in all threads. // This version may only be called by sequential code. static void oops_do(OopClosure* f, CodeBlobClosure* cf); // This version may be called by sequential or parallel code. static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf); // Apply "f->do_oop" to roots in all threads that // are part of compiled frames static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); static void convert_hcode_pointers(); static void restore_hcode_pointers(); // Sweeper static void nmethods_do(CodeBlobClosure* cf); // RedefineClasses support static void metadata_do(void f(Metadata*)); static void metadata_handles_do(void f(Metadata*)); #ifdef ASSERT static bool is_vm_complete() { return _vm_complete; } #endif // Verification static void verify(); static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); static void print(bool print_stacks, bool internal_format) { // this function is only used by debug.cpp print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); } static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf, int buflen, bool* found_current); static void print_threads_compiling(outputStream* st, char* buf, int buflen); // Get Java threads that are waiting to enter a monitor. static GrowableArray* get_pending_threads(ThreadsList * t_list, int count, address monitor); // Get owning Java thread from the monitor's owner field. static JavaThread *owning_thread_from_monitor_owner(ThreadsList * t_list, address owner); // Number of threads on the active threads list static int number_of_threads() { return _number_of_threads; } // Number of non-daemon threads on the active threads list static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } // Deoptimizes all frames tied to marked nmethods static void deoptimized_wrt_marked_nmethods(); }; // Thread iterator class ThreadClosure: public StackObj { public: virtual void do_thread(Thread* thread) = 0; }; class SignalHandlerMark: public StackObj { private: Thread* _thread; public: SignalHandlerMark(Thread* t) { _thread = t; if (_thread) _thread->enter_signal_handler(); } ~SignalHandlerMark() { if (_thread) _thread->leave_signal_handler(); _thread = NULL; } }; #endif // SHARE_VM_RUNTIME_THREAD_HPP