| /* |
| * Copyright (c) 1997, 2019, 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_RUNTIME_THREAD_HPP |
| #define SHARE_RUNTIME_THREAD_HPP |
| |
| #include "jni.h" |
| #include "code/compiledMethod.hpp" |
| #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/stubRoutines.hpp" |
| #include "runtime/threadHeapSampler.hpp" |
| #include "runtime/threadLocalStorage.hpp" |
| #include "runtime/threadStatisticalInfo.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 ThreadStatistics; |
| class ConcurrentLocksDump; |
| class ParkEvent; |
| class Parker; |
| class MonitorInfo; |
| |
| class ciEnv; |
| class CompileThread; |
| class CompileLog; |
| class CompileTask; |
| class CompileQueue; |
| class CompilerCounters; |
| |
| class vframeArray; |
| class vframe; |
| class javaVFrame; |
| |
| class DeoptResourceMark; |
| class jvmtiDeferredLocalVariableSet; |
| |
| class GCTaskQueue; |
| class ThreadClosure; |
| class ICRefillVerifier; |
| class IdealGraphPrinter; |
| |
| class JVMCIEnv; |
| class JVMCIPrimitiveArray; |
| |
| class Metadata; |
| class ResourceArea; |
| |
| DEBUG_ONLY(class ResourceMark;) |
| |
| class WorkerThread; |
| |
| // Class hierarchy |
| // - Thread |
| // - JavaThread |
| // - various subclasses eg CompilerThread, ServiceThread |
| // - NonJavaThread |
| // - NamedThread |
| // - VMThread |
| // - ConcurrentGCThread |
| // - WorkerThread |
| // - GangWorker |
| // - GCTaskThread |
| // - WatcherThread |
| // - JfrThreadSampler |
| // |
| // All Thread subclasses must be either JavaThread or NonJavaThread. |
| // This means !t->is_Java_thread() iff t is a NonJavaThread, or t is |
| // a partially constructed/destroyed Thread. |
| |
| // Thread execution sequence and actions: |
| // All threads: |
| // - thread_native_entry // per-OS native entry point |
| // - stack initialization |
| // - other OS-level initialization (signal masks etc) |
| // - handshake with creating thread (if not started suspended) |
| // - this->call_run() // common shared entry point |
| // - shared common initialization |
| // - this->pre_run() // virtual per-thread-type initialization |
| // - this->run() // virtual per-thread-type "main" logic |
| // - shared common tear-down |
| // - this->post_run() // virtual per-thread-type tear-down |
| // - // 'this' no longer referenceable |
| // - OS-level tear-down (minimal) |
| // - final logging |
| // |
| // For JavaThread: |
| // - this->run() // virtual but not normally overridden |
| // - this->thread_main_inner() // extra call level to ensure correct stack calculations |
| // - this->entry_point() // set differently for each kind of JavaThread |
| |
| 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 |
| |
| // 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 <typename T> T* gc_data() { |
| STATIC_ASSERT(sizeof(T) <= sizeof(_gc_data)); |
| return reinterpret_cast<T*>(&_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: |
| |
| DEBUG_ONLY(static Thread* _starting_thread;) |
| |
| // 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 |
| |
| _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; } |
| |
| // Determines if a heap allocation failure will be retried |
| // (e.g., by deoptimizing and re-executing in the interpreter). |
| // In this case, the failed allocation must raise |
| // Universe::out_of_memory_error_retry() and omit side effects |
| // such as JVMTI events and handling -XX:+HeapDumpOnOutOfMemoryError |
| // and -XX:OnOutOfMemoryError. |
| virtual bool in_retryable_allocation() const { return false; } |
| |
| #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; |
| |
| // Claim value for parallel iteration over threads. |
| uintx _threads_do_token; |
| |
| // 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: |
| |
| #ifdef ASSERT |
| ICRefillVerifier* _missed_ic_stub_refill_verifier; |
| |
| public: |
| ICRefillVerifier* missed_ic_stub_refill_verifier() { |
| return _missed_ic_stub_refill_verifier; |
| } |
| |
| void set_missed_ic_stub_refill_verifier(ICRefillVerifier* verifier) { |
| _missed_ic_stub_refill_verifier = verifier; |
| } |
| #endif |
| |
| 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 |
| ThreadHeapSampler _heap_sampler; // For use when sampling the memory. |
| |
| ThreadStatisticalInfo _statistical_info; // Statistics about the thread |
| |
| 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: |
| volatile uint64_t _visited_for_critical_count; |
| |
| public: |
| void set_visited_for_critical_count(uint64_t safepoint_id) { |
| assert(_visited_for_critical_count == 0, "Must be reset before set"); |
| assert((safepoint_id & 0x1) == 1, "Must be odd"); |
| _visited_for_critical_count = safepoint_id; |
| } |
| void reset_visited_for_critical_count(uint64_t safepoint_id) { |
| assert(_visited_for_critical_count == safepoint_id, "Was not visited"); |
| _visited_for_critical_count = 0; |
| } |
| bool was_visited_for_critical_count(uint64_t safepoint_id) const { |
| return _visited_for_critical_count == safepoint_id; |
| } |
| #endif |
| |
| public: |
| enum { |
| is_definitely_current_thread = true |
| }; |
| |
| // Constructor |
| Thread(); |
| virtual ~Thread() = 0; // Thread is abstract. |
| |
| // Manage Thread::current() |
| void initialize_thread_current(); |
| static void clear_thread_current(); // TLS cleanup needed before threads terminate |
| |
| protected: |
| // To be implemented by children. |
| virtual void run() = 0; |
| virtual void pre_run() = 0; |
| virtual void post_run() = 0; // Note: Thread must not be deleted prior to calling this! |
| |
| #ifdef ASSERT |
| enum RunState { |
| PRE_CALL_RUN, |
| CALL_RUN, |
| PRE_RUN, |
| RUN, |
| POST_RUN |
| // POST_CALL_RUN - can't define this one as 'this' may be deleted when we want to set it |
| }; |
| RunState _run_state; // for lifecycle checks |
| #endif |
| |
| |
| public: |
| // invokes <ChildThreadClass>::run(), with common preparations and cleanups. |
| void call_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*>* metadata_handles() const { return _metadata_handles; } |
| void set_metadata_handles(GrowableArray<Metadata*>* 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(); |
| |
| ThreadHeapSampler& heap_sampler() { return _heap_sampler; } |
| |
| ThreadStatisticalInfo& statistical_info() { return _statistical_info; } |
| |
| 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 claim_threads_do. |
| private: |
| bool claim_par_threads_do(uintx claim_token); |
| public: |
| // Requires that "claim_token" is that of the current iteration. |
| // If "is_par" is false, sets the token of "this" to |
| // "claim_token", and returns "true". If "is_par" is true, |
| // uses an atomic instruction to set the current thread's token to |
| // "claim_token", if it is not already. Returns "true" iff the |
| // calling thread does the update, this indicates that the calling thread |
| // has claimed the thread in the current iteration. |
| bool claim_threads_do(bool is_par, uintx claim_token) { |
| if (!is_par) { |
| _threads_do_token = claim_token; |
| return true; |
| } else { |
| return claim_par_threads_do(claim_token); |
| } |
| } |
| |
| uintx threads_do_token() const { return _threads_do_token; } |
| |
| // 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*>* _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(); |
| void register_thread_stack_with_NMT() NOT_NMT_RETURN; |
| |
| 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 |
| void print_on(outputStream* st, bool print_extended_info) const; |
| virtual void print_on(outputStream* st) const { print_on(st, false); } |
| void print() const; |
| 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; |
| |
| // 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); } |
| |
| static ByteSize tlab_start_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::start_offset(); } |
| static ByteSize tlab_end_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::end_offset(); } |
| static ByteSize tlab_top_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::top_offset(); } |
| static ByteSize tlab_pf_top_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::pf_top_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 * _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; |
| |
| // 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; |
| } |
| |
| class NonJavaThread: public Thread { |
| friend class VMStructs; |
| |
| NonJavaThread* volatile _next; |
| |
| class List; |
| static List _the_list; |
| |
| void add_to_the_list(); |
| void remove_from_the_list(); |
| |
| protected: |
| virtual void pre_run(); |
| virtual void post_run(); |
| |
| public: |
| NonJavaThread(); |
| ~NonJavaThread(); |
| |
| class Iterator; |
| }; |
| |
| // Provides iteration over the list of NonJavaThreads. |
| // List addition occurs in pre_run(), and removal occurs in post_run(), |
| // so that only live fully-initialized threads can be found in the list. |
| // Threads created after an iterator is constructed will not be visited |
| // by the iterator. The scope of an iterator is a critical section; there |
| // must be no safepoint checks in that scope. |
| class NonJavaThread::Iterator : public StackObj { |
| uint _protect_enter; |
| NonJavaThread* _current; |
| |
| // Noncopyable. |
| Iterator(const Iterator&); |
| Iterator& operator=(const Iterator&); |
| |
| public: |
| Iterator(); |
| ~Iterator(); |
| |
| bool end() const { return _current == NULL; } |
| NonJavaThread* current() const { return _current; } |
| void step(); |
| }; |
| |
| // Name support for threads. non-JavaThread subclasses with multiple |
| // uniquely named instances should derive from this. |
| class NamedThread: public NonJavaThread { |
| 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); |
| 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 NonJavaThread { |
| friend class VMStructs; |
| protected: |
| 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: |
| 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<jvmtiDeferredLocalVariableSet*>* _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: |
| // 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; |
| |
| // True if in a runtime call from compiled code that will deoptimize |
| // and re-execute a failed heap allocation in the interpreter. |
| bool _in_retryable_allocation; |
| |
| // An id of a speculation that JVMCI compiled code can use to further describe and |
| // uniquely identify the speculative optimization guarded by the uncommon trap |
| jlong _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(jlong* array, int length); |
| |
| bool resize_counters(int current_size, int new_size); |
| |
| static bool resize_all_jvmci_counters(int new_size); |
| |
| 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(bool is_daemon); |
| |
| // Testers |
| virtual bool is_Java_thread() const { return true; } |
| virtual bool can_call_java() const { return true; } |
| |
| // 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 |
| inline JavaThreadState thread_state() const; |
| inline void set_thread_state(JavaThreadState s); |
| inline void set_thread_state_fence(JavaThreadState s); // fence after setting thread state |
| inline ThreadSafepointState* safepoint_state() const; |
| inline void set_safepoint_state(ThreadSafepointState* state); |
| inline bool 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_release(void* poll_value); |
| 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 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(); // higher-level suspension logic called by the public APIs |
| void java_resume(); // higher-level resume logic called by the public APIs |
| int java_suspend_self(); // low-level self-suspension mechanics |
| |
| private: |
| // mid-level wrapper around java_suspend_self to set up correct state and |
| // check for a pending safepoint at the end |
| void java_suspend_self_with_safepoint_check(); |
| |
| public: |
| 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) { |
| MutexLocker 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(); |
| |
| 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 JFR_ONLY(| _trace_flag))) != 0; |
| } |
| |
| // external suspend request is completed |
| bool is_ext_suspended() const { |
| return (_suspend_flags & _ext_suspended) != 0; |
| } |
| |
| bool is_external_suspend_with_lock() const { |
| MutexLocker 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"); |
| MutexLocker 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 { |
| MutexLocker 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<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } |
| void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* 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; } |
| jlong pending_failed_speculation() const { return _pending_failed_speculation; } |
| 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(jlong 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; } |
| |
| virtual bool in_retryable_allocation() const { return _in_retryable_allocation; } |
| void set_in_retryable_allocation(bool b) { _in_retryable_allocation = b; } |
| #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<oop&>(_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); } |
| #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; } |
| inline void enter_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(MetadataClosure* f); |
| |
| // Debug method asserting thread states are correct during a handshake operation. |
| DEBUG_ONLY(void verify_states_for_handshake();) |
| |
| // Misc. operations |
| char* name() const { return (char*)get_thread_name(); } |
| void print_on(outputStream* st, bool print_extended_info) const; |
| void print_on(outputStream* st) const { print_on(st, false); } |
| void print() 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; |
| protected: |
| // factor out low-level mechanics for use in both normal and error cases |
| virtual 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(); |
| |
| protected: |
| virtual void pre_run(); |
| virtual void run(); |
| void thread_main_inner(); |
| virtual void post_run(); |
| |
| |
| private: |
| GrowableArray<oop>* _array_for_gc; |
| public: |
| |
| void register_array_for_gc(GrowableArray<oop>* 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); } |
| |
| // 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; |
| |
| // 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<MonitorInfo*>* _cached_monitor_info; |
| public: |
| GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } |
| void set_cached_monitor_info(GrowableArray<MonitorInfo*>* 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(); |
| |
| // Stack dump assistance: |
| // Track the class we want to initialize but for which we have to wait |
| // on its init_lock() because it is already being initialized. |
| void set_class_to_be_initialized(InstanceKlass* k); |
| InstanceKlass* class_to_be_initialized() const; |
| |
| private: |
| InstanceKlass* _class_to_be_initialized; |
| |
| }; |
| |
| // 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 int _number_of_threads; |
| static int _number_of_non_daemon_threads; |
| static int _return_code; |
| static uintx _thread_claim_token; |
| #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, bool is_daemon); |
| 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 token" provides a way for threads to be claimed |
| // by parallel worker tasks. |
| // |
| // Each thread contains a "token" field. A task will claim the |
| // thread only if its token is different from the global token, |
| // which is updated by calling change_thread_claim_token(). When |
| // a thread is claimed, it's token is set to the global token value |
| // so other threads in the same iteration pass won't claim it. |
| // |
| // For this to work change_thread_claim_token() needs to be called |
| // exactly once in sequential code before starting parallel tasks |
| // that should claim threads. |
| // |
| // New threads get their token set to 0 and change_thread_claim_token() |
| // never sets the global token to 0. |
| static uintx thread_claim_token() { return _thread_claim_token; } |
| static void change_thread_claim_token(); |
| 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(MetadataClosure* f); |
| static void metadata_handles_do(void f(Metadata*)); |
| |
| #ifdef ASSERT |
| static bool is_vm_complete() { return _vm_complete; } |
| #endif // ASSERT |
| |
| // Verification |
| static void verify(); |
| static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks, bool print_extended_info); |
| 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 */, false /* simple format */); |
| } |
| 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, bool short_form = false); |
| |
| // Get Java threads that are waiting to enter a monitor. |
| static GrowableArray<JavaThread*>* 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(); |
| |
| struct Test; // For private gtest access. |
| }; |
| |
| |
| // 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_RUNTIME_THREAD_HPP |