1 /*
2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2021, Azul Systems, Inc. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #ifndef SHARE_RUNTIME_JAVATHREAD_HPP
27 #define SHARE_RUNTIME_JAVATHREAD_HPP
28
29 #include "jni.h"
30 #include "memory/allocation.hpp"
31 #include "oops/oop.hpp"
32 #include "oops/oopHandle.hpp"
33 #include "runtime/frame.hpp"
34 #include "runtime/globals.hpp"
35 #include "runtime/handshake.hpp"
36 #include "runtime/javaFrameAnchor.hpp"
37 #include "runtime/park.hpp"
38 #include "runtime/safepointMechanism.hpp"
39 #include "runtime/stackWatermarkSet.hpp"
40 #include "runtime/stackOverflow.hpp"
41 #include "runtime/thread.hpp"
42 #include "runtime/threadHeapSampler.hpp"
43 #include "runtime/threadStatisticalInfo.hpp"
44 #include "utilities/exceptions.hpp"
45 #include "utilities/globalDefinitions.hpp"
46 #include "utilities/macros.hpp"
47 #if INCLUDE_JFR
48 #include "jfr/support/jfrThreadExtension.hpp"
49 #endif
50
51 class AsyncExceptionHandshake;
52 class ContinuationEntry;
53 class DeoptResourceMark;
54 class JNIHandleBlock;
55 class JVMCIRuntime;
56
57 class JvmtiDeferredUpdates;
58 class JvmtiSampledObjectAllocEventCollector;
59 class JvmtiThreadState;
60
61 class Metadata;
62 class OopHandleList;
63 class OopStorage;
64 class OSThread;
65
66 class ThreadsList;
67 class ThreadSafepointState;
68 class ThreadStatistics;
69
70 class vframeArray;
71 class vframe;
72 class javaVFrame;
73
74 class JavaThread;
75 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
76
77 class JavaThread: public Thread {
78 friend class VMStructs;
79 friend class JVMCIVMStructs;
80 friend class WhiteBox;
81 friend class ThreadsSMRSupport; // to access _threadObj for exiting_threads_oops_do
82 friend class HandshakeState;
83 friend class Continuation;
84 friend class Threads;
85 friend class ServiceThread; // for deferred OopHandle release access
86 private:
87 bool _on_thread_list; // Is set when this JavaThread is added to the Threads list
88
89 // All references to Java objects managed via OopHandles. These
90 // have to be released by the ServiceThread after the JavaThread has
91 // terminated - see add_oop_handles_for_release().
92 OopHandle _threadObj; // The Java level thread object
93 OopHandle _vthread; // the value returned by Thread.currentThread(): the virtual thread, if mounted, otherwise _threadObj
94 OopHandle _jvmti_vthread;
95 OopHandle _scopedValueCache;
96
97 static OopStorage* _thread_oop_storage;
98
99 #ifdef ASSERT
100 private:
101 int _java_call_counter;
102
103 public:
104 int java_call_counter() { return _java_call_counter; }
105 void inc_java_call_counter() { _java_call_counter++; }
106 void dec_java_call_counter() {
107 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
108 _java_call_counter--;
109 }
110 private: // restore original namespace restriction
111 #endif // ifdef ASSERT
112
113 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
114
115 ThreadFunction _entry_point;
116
117 JNIEnv _jni_environment;
118
119 // Deopt support
120 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
121
122 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized
123 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
124 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
125 // Holds updates by JVMTI agents for compiled frames that cannot be performed immediately. They
126 // will be carried out as soon as possible which, in most cases, is just before deoptimization of
127 // the frame, when control returns to it.
128 JvmtiDeferredUpdates* _jvmti_deferred_updates;
129
130 // Handshake value for fixing 6243940. We need a place for the i2c
131 // adapter to store the callee Method*. This value is NEVER live
132 // across a gc point so it does NOT have to be gc'd
133 // The handshake is open ended since we can't be certain that it will
134 // be NULLed. This is because we rarely ever see the race and end up
135 // in handle_wrong_method which is the backend of the handshake. See
136 // code in i2c adapters and handle_wrong_method.
137
138 Method* _callee_target;
139
140 // Used to pass back results to the interpreter or generated code running Java code.
141 oop _vm_result; // oop result is GC-preserved
142 Metadata* _vm_result_2; // non-oop result
143 oop _return_buffered_value; // buffered value being returned
144
145 // See ReduceInitialCardMarks: this holds the precise space interval of
146 // the most recent slow path allocation for which compiled code has
147 // elided card-marks for performance along the fast-path.
148 MemRegion _deferred_card_mark;
149
150 ObjectMonitor* volatile _current_pending_monitor; // ObjectMonitor this thread is waiting to lock
151 bool _current_pending_monitor_is_from_java; // locking is from Java code
152 ObjectMonitor* volatile _current_waiting_monitor; // ObjectMonitor on which this thread called Object.wait()
153
154 // Active_handles points to a block of handles
155 JNIHandleBlock* _active_handles;
156
157 // One-element thread local free list
158 JNIHandleBlock* _free_handle_block;
159
160 public:
161 volatile intptr_t _Stalled;
162
163 // For tracking the heavyweight monitor the thread is pending on.
164 ObjectMonitor* current_pending_monitor() {
165 // Use Atomic::load() to prevent data race between concurrent modification and
166 // concurrent readers, e.g. ThreadService::get_current_contended_monitor().
167 // Especially, reloading pointer from thread after NULL check must be prevented.
168 return Atomic::load(&_current_pending_monitor);
169 }
170 void set_current_pending_monitor(ObjectMonitor* monitor) {
171 Atomic::store(&_current_pending_monitor, monitor);
172 }
173 void set_current_pending_monitor_is_from_java(bool from_java) {
174 _current_pending_monitor_is_from_java = from_java;
175 }
176 bool current_pending_monitor_is_from_java() {
177 return _current_pending_monitor_is_from_java;
178 }
179 ObjectMonitor* current_waiting_monitor() {
180 // See the comment in current_pending_monitor() above.
181 return Atomic::load(&_current_waiting_monitor);
182 }
183 void set_current_waiting_monitor(ObjectMonitor* monitor) {
184 Atomic::store(&_current_waiting_monitor, monitor);
185 }
186
187 // JNI handle support
188 JNIHandleBlock* active_handles() const { return _active_handles; }
189 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
190 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
191 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
192
193 void push_jni_handle_block();
194 void pop_jni_handle_block();
195
196 private:
197 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
198 // allocated during deoptimization
199 // and by JNI_MonitorEnter/Exit
200
201 enum SuspendFlags {
202 // NOTE: avoid using the sign-bit as cc generates different test code
203 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
204 _trace_flag = 0x00000004U, // call tracing backend
205 _obj_deopt = 0x00000008U // suspend for object reallocation and relocking for JVMTI agent
206 };
207
208 // various suspension related flags - atomically updated
209 volatile uint32_t _suspend_flags;
210
211 inline void set_suspend_flag(SuspendFlags f);
212 inline void clear_suspend_flag(SuspendFlags f);
213
214 public:
215 inline void set_trace_flag();
216 inline void clear_trace_flag();
217 inline void set_obj_deopt_flag();
218 inline void clear_obj_deopt_flag();
219 bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; }
220 bool is_obj_deopt_suspend() { return (_suspend_flags & _obj_deopt) != 0; }
221
222 // Asynchronous exception support
223 private:
224 friend class InstallAsyncExceptionHandshake;
225 friend class AsyncExceptionHandshake;
226 friend class HandshakeState;
227
228 void install_async_exception(AsyncExceptionHandshake* aec = NULL);
229 void handle_async_exception(oop java_throwable);
230 public:
231 bool has_async_exception_condition();
232 inline void set_pending_unsafe_access_error();
233 static void send_async_exception(JavaThread* jt, oop java_throwable);
234
235 class NoAsyncExceptionDeliveryMark : public StackObj {
236 friend JavaThread;
237 JavaThread *_target;
238 inline NoAsyncExceptionDeliveryMark(JavaThread *t);
239 inline ~NoAsyncExceptionDeliveryMark();
240 };
241
242 // Safepoint support
243 public: // Expose _thread_state for SafeFetchInt()
244 volatile JavaThreadState _thread_state;
245 private:
246 SafepointMechanism::ThreadData _poll_data;
247 ThreadSafepointState* _safepoint_state; // Holds information about a thread during a safepoint
248 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
249 NOT_PRODUCT(bool _requires_cross_modify_fence;) // State used by VerifyCrossModifyFence
250 #ifdef ASSERT
251 // Debug support for checking if code allows safepoints or not.
252 // Safepoints in the VM can happen because of allocation, invoking a VM operation, or blocking on
253 // mutex, or blocking on an object synchronizer (Java locking).
254 // If _no_safepoint_count is non-zero, then an assertion failure will happen in any of
255 // the above cases. The class NoSafepointVerifier is used to set this counter.
256 int _no_safepoint_count; // If 0, thread allow a safepoint to happen
257
258 public:
259 void inc_no_safepoint_count() { _no_safepoint_count++; }
260 void dec_no_safepoint_count() { _no_safepoint_count--; }
261 #endif // ASSERT
262 public:
263 // These functions check conditions before possibly going to a safepoint.
264 // including NoSafepointVerifier.
265 void check_for_valid_safepoint_state() NOT_DEBUG_RETURN;
266 void check_possible_safepoint() NOT_DEBUG_RETURN;
267
268 #ifdef ASSERT
269 private:
270 volatile uint64_t _visited_for_critical_count;
271
272 public:
273 void set_visited_for_critical_count(uint64_t safepoint_id) {
274 assert(_visited_for_critical_count == 0, "Must be reset before set");
275 assert((safepoint_id & 0x1) == 1, "Must be odd");
276 _visited_for_critical_count = safepoint_id;
277 }
278 void reset_visited_for_critical_count(uint64_t safepoint_id) {
279 assert(_visited_for_critical_count == safepoint_id, "Was not visited");
280 _visited_for_critical_count = 0;
281 }
282 bool was_visited_for_critical_count(uint64_t safepoint_id) const {
283 return _visited_for_critical_count == safepoint_id;
284 }
285 #endif // ASSERT
286
287 // JavaThread termination support
288 public:
289 enum TerminatedTypes {
290 _not_terminated = 0xDEAD - 3,
291 _thread_exiting, // JavaThread::exit() has been called for this thread
292 _thread_gc_barrier_detached, // thread's GC barrier has been detached
293 _thread_terminated, // JavaThread is removed from thread list
294 _vm_exited // JavaThread is still executing native code, but VM is terminated
295 // only VM_Exit can set _vm_exited
296 };
297
298 private:
299 // In general a JavaThread's _terminated field transitions as follows:
300 //
301 // _not_terminated => _thread_exiting => _thread_gc_barrier_detached => _thread_terminated
302 //
303 // _vm_exited is a special value to cover the case of a JavaThread
304 // executing native code after the VM itself is terminated.
305 //
306 // A JavaThread that fails to JNI attach has these _terminated field transitions:
307 // _not_terminated => _thread_terminated
308 //
309 volatile TerminatedTypes _terminated;
310
311 jint _in_deopt_handler; // count of deoptimization
312 // handlers thread is in
313 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
314 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
315 // never locked) when throwing an exception. Used by interpreter only.
316 #if INCLUDE_JVMTI
317 volatile bool _carrier_thread_suspended; // Carrier thread is externally suspended
318 bool _is_in_VTMS_transition; // thread is in virtual thread mount state transition
319 bool _is_in_tmp_VTMS_transition; // thread is in temporary virtual thread mount state transition
320 #ifdef ASSERT
321 bool _is_VTMS_transition_disabler; // thread currently disabled VTMS transitions
322 #endif
323 #endif
324
325 // JNI attach states:
326 enum JNIAttachStates {
327 _not_attaching_via_jni = 1, // thread is not attaching via JNI
328 _attaching_via_jni, // thread is attaching via JNI
329 _attached_via_jni // thread has attached via JNI
330 };
331
332 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
333 // A native thread that is attaching via JNI starts with a value
334 // of _attaching_via_jni and transitions to _attached_via_jni.
335 volatile JNIAttachStates _jni_attach_state;
336
337
338 #if INCLUDE_JVMCI
339 // The _pending_* fields below are used to communicate extra information
340 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler.
341
342 // Communicates the DeoptReason and DeoptAction of the uncommon trap
343 int _pending_deoptimization;
344
345 // Specifies whether the uncommon trap is to bci 0 of a synchronized method
346 // before the monitor has been acquired.
347 bool _pending_monitorenter;
348
349 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter
350 bool _pending_transfer_to_interpreter;
351
352 // True if in a runtime call from compiled code that will deoptimize
353 // and re-execute a failed heap allocation in the interpreter.
354 bool _in_retryable_allocation;
355
356 // An id of a speculation that JVMCI compiled code can use to further describe and
357 // uniquely identify the speculative optimization guarded by an uncommon trap.
358 // See JVMCINMethodData::SPECULATION_LENGTH_BITS for further details.
359 jlong _pending_failed_speculation;
360
361 // These fields are mutually exclusive in terms of live ranges.
362 union {
363 // Communicates the pc at which the most recent implicit exception occurred
364 // from the signal handler to a deoptimization stub.
365 address _implicit_exception_pc;
366
367 // Communicates an alternative call target to an i2c stub from a JavaCall .
368 address _alternate_call_target;
369 } _jvmci;
370
371 // The JVMCIRuntime in a JVMCI shared library
372 JVMCIRuntime* _libjvmci_runtime;
373
374 // Support for high precision, thread sensitive counters in JVMCI compiled code.
375 jlong* _jvmci_counters;
376
377 // Fast thread locals for use by JVMCI
378 jlong _jvmci_reserved0;
379 jlong _jvmci_reserved1;
380 oop _jvmci_reserved_oop0;
381
382 public:
383 static jlong* _jvmci_old_thread_counters;
384 static void collect_counters(jlong* array, int length);
385
386 bool resize_counters(int current_size, int new_size);
387
388 static bool resize_all_jvmci_counters(int new_size);
389
390 void set_jvmci_reserved_oop0(oop value) {
391 _jvmci_reserved_oop0 = value;
392 }
393
394 oop get_jvmci_reserved_oop0() {
395 return _jvmci_reserved_oop0;
396 }
397
398 void set_jvmci_reserved0(jlong value) {
399 _jvmci_reserved0 = value;
400 }
401
402 jlong get_jvmci_reserved0() {
403 return _jvmci_reserved0;
404 }
405
406 void set_jvmci_reserved1(jlong value) {
407 _jvmci_reserved1 = value;
408 }
409
410 jlong get_jvmci_reserved1() {
411 return _jvmci_reserved1;
412 }
413
414 private:
415 #endif // INCLUDE_JVMCI
416
417 StackOverflow _stack_overflow_state;
418
419 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
420 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
421 // code)
422 volatile oop _exception_oop; // Exception thrown in compiled code
423 volatile address _exception_pc; // PC where exception happened
424 volatile address _exception_handler_pc; // PC for handler of exception
425 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
426
427 private:
428 // support for JNI critical regions
429 jint _jni_active_critical; // count of entries into JNI critical region
430
431 // Checked JNI: function name requires exception check
432 char* _pending_jni_exception_check_fn;
433
434 // For deadlock detection.
435 int _depth_first_number;
436
437 // JVMTI PopFrame support
438 // This is set to popframe_pending to signal that top Java frame should be popped immediately
439 int _popframe_condition;
440
441 // If reallocation of scalar replaced objects fails, we throw OOM
442 // and during exception propagation, pop the top
443 // _frames_to_pop_failed_realloc frames, the ones that reference
444 // failed reallocations.
445 int _frames_to_pop_failed_realloc;
446
447 ContinuationEntry* _cont_entry;
448 intptr_t* _cont_fastpath; // the sp of the oldest known interpreted/call_stub frame inside the
449 // continuation that we know about
450 int _cont_fastpath_thread_state; // whether global thread state allows continuation fastpath (JVMTI)
451 // It's signed for error detection.
452 #ifdef _LP64
453 int64_t _held_monitor_count; // used by continuations for fast lock detection
454 int64_t _jni_monitor_count;
455 #else
456 int32_t _held_monitor_count; // used by continuations for fast lock detection
457 int32_t _jni_monitor_count;
458 #endif
459
460 private:
461
462 friend class VMThread;
463 friend class ThreadWaitTransition;
464 friend class VM_Exit;
465
466 // Stack watermark barriers.
467 StackWatermarks _stack_watermarks;
468
469 public:
470 inline StackWatermarks* stack_watermarks() { return &_stack_watermarks; }
471
472 public:
473 // Constructor
474 JavaThread(); // delegating constructor
475 JavaThread(bool is_attaching_via_jni); // for main thread and JNI attached threads
476 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
477 ~JavaThread();
478
479 #ifdef ASSERT
480 // verify this JavaThread hasn't be published in the Threads::list yet
481 void verify_not_published();
482 #endif // ASSERT
483
484 StackOverflow* stack_overflow_state() { return &_stack_overflow_state; }
485
486 //JNI functiontable getter/setter for JVMTI jni function table interception API.
487 void set_jni_functions(struct JNINativeInterface_* functionTable) {
488 _jni_environment.functions = functionTable;
489 }
490 struct JNINativeInterface_* get_jni_functions() {
491 return (struct JNINativeInterface_ *)_jni_environment.functions;
492 }
493
494 // This function is called at thread creation to allow
495 // platform specific thread variables to be initialized.
496 void cache_global_variables();
497
498 // Executes Shutdown.shutdown()
499 void invoke_shutdown_hooks();
500
501 // Cleanup on thread exit
502 enum ExitType {
503 normal_exit,
504 jni_detach
505 };
506 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
507
508 void cleanup_failed_attach_current_thread(bool is_daemon);
509
510 // Testers
511 virtual bool is_Java_thread() const { return true; }
512 virtual bool can_call_java() const { return true; }
513
514 virtual bool is_active_Java_thread() const {
515 return on_thread_list() && !is_terminated();
516 }
517
518 // Thread oop. threadObj() can be NULL for initial JavaThread
519 // (or for threads attached via JNI)
520 oop threadObj() const;
521 void set_threadOopHandles(oop p);
522 oop vthread() const;
523 void set_vthread(oop p);
524 oop scopedValueCache() const;
525 void set_scopedValueCache(oop p);
526 void clear_scopedValueBindings();
527 oop jvmti_vthread() const;
528 void set_jvmti_vthread(oop p);
529
530 // Prepare thread and add to priority queue. If a priority is
531 // not specified, use the priority of the thread object. Threads_lock
532 // must be held while this function is called.
533 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
534
535 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
536 address saved_exception_pc() { return _saved_exception_pc; }
537
538 ThreadFunction entry_point() const { return _entry_point; }
539
540 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
541 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS);
542
543 // Last frame anchor routines
544
545 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
546
547 // last_Java_sp
548 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
549 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
550
551 // last_Java_pc
552
553 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
554
555 // Safepoint support
556 inline JavaThreadState thread_state() const;
557 inline void set_thread_state(JavaThreadState s);
558 inline void set_thread_state_fence(JavaThreadState s); // fence after setting thread state
559 inline ThreadSafepointState* safepoint_state() const;
560 inline void set_safepoint_state(ThreadSafepointState* state);
561 inline bool is_at_poll_safepoint();
562
563 // JavaThread termination and lifecycle support:
564 void smr_delete();
565 bool on_thread_list() const { return _on_thread_list; }
566 void set_on_thread_list() { _on_thread_list = true; }
567
568 // thread has called JavaThread::exit(), thread's GC barrier is detached
569 // or thread is terminated
570 bool is_exiting() const;
571 // thread's GC barrier is NOT detached and thread is NOT terminated
572 bool is_oop_safe() const;
573 // thread is terminated (no longer on the threads list); the thread must
574 // be protected by a ThreadsListHandle to avoid potential crashes.
575 bool check_is_terminated(TerminatedTypes l_terminated) const {
576 return l_terminated == _thread_terminated || l_terminated == _vm_exited;
577 }
578 bool is_terminated() const;
579 void set_terminated(TerminatedTypes t);
580
581 void block_if_vm_exited();
582
583 bool doing_unsafe_access() { return _doing_unsafe_access; }
584 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
585
586 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
587 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
588
589 SafepointMechanism::ThreadData* poll_data() { return &_poll_data; }
590
591 void set_requires_cross_modify_fence(bool val) PRODUCT_RETURN NOT_PRODUCT({ _requires_cross_modify_fence = val; })
592
593 // Continuation support
594 ContinuationEntry* last_continuation() const { return _cont_entry; }
595 void set_cont_fastpath(intptr_t* x) { _cont_fastpath = x; }
596 void push_cont_fastpath(intptr_t* sp) { if (sp > _cont_fastpath) _cont_fastpath = sp; }
597 void set_cont_fastpath_thread_state(bool x) { _cont_fastpath_thread_state = (int)x; }
598 intptr_t* raw_cont_fastpath() const { return _cont_fastpath; }
599 bool cont_fastpath() const { return _cont_fastpath == NULL && _cont_fastpath_thread_state != 0; }
600 bool cont_fastpath_thread_state() const { return _cont_fastpath_thread_state != 0; }
601
602 void inc_held_monitor_count(int i = 1, bool jni = false);
603 void dec_held_monitor_count(int i = 1, bool jni = false);
604
605 int64_t held_monitor_count() { return (int64_t)_held_monitor_count; }
606 int64_t jni_monitor_count() { return (int64_t)_jni_monitor_count; }
607 void clear_jni_monitor_count() { _jni_monitor_count = 0; }
608
609 inline bool is_vthread_mounted() const;
610 inline const ContinuationEntry* vthread_continuation() const;
611
612 private:
613 DEBUG_ONLY(void verify_frame_info();)
614
615 // Support for thread handshake operations
616 HandshakeState _handshake;
617 public:
618 HandshakeState* handshake_state() { return &_handshake; }
619
620 // A JavaThread can always safely operate on it self and other threads
621 // can do it safely if they are the active handshaker.
622 bool is_handshake_safe_for(Thread* th) const {
623 return _handshake.active_handshaker() == th || this == th;
624 }
625
626 // Suspend/resume support for JavaThread
627 // higher-level suspension/resume logic called by the public APIs
628 bool java_suspend();
629 bool java_resume();
630 bool is_suspended() { return _handshake.is_suspended(); }
631
632 // Check for async exception in addition to safepoint.
633 static void check_special_condition_for_native_trans(JavaThread *thread);
634
635 // Synchronize with another thread that is deoptimizing objects of the
636 // current thread, i.e. reverts optimizations based on escape analysis.
637 void wait_for_object_deoptimization();
638
639 #if INCLUDE_JVMTI
640 inline void set_carrier_thread_suspended();
641 inline void clear_carrier_thread_suspended();
642
643 bool is_carrier_thread_suspended() const {
644 return _carrier_thread_suspended;
645 }
646
647 bool is_in_VTMS_transition() const { return _is_in_VTMS_transition; }
648 bool is_in_tmp_VTMS_transition() const { return _is_in_tmp_VTMS_transition; }
649 bool is_in_any_VTMS_transition() const { return _is_in_VTMS_transition || _is_in_tmp_VTMS_transition; }
650
651 void set_is_in_VTMS_transition(bool val);
652 void toggle_is_in_tmp_VTMS_transition() { _is_in_tmp_VTMS_transition = !_is_in_tmp_VTMS_transition; };
653
654 #ifdef ASSERT
655 bool is_VTMS_transition_disabler() const { return _is_VTMS_transition_disabler; }
656 void set_is_VTMS_transition_disabler(bool val);
657 #endif
658 #endif
659
660 // Support for object deoptimization and JFR suspension
661 void handle_special_runtime_exit_condition();
662 bool has_special_runtime_exit_condition() {
663 return (_suspend_flags & (_obj_deopt JFR_ONLY(| _trace_flag))) != 0;
664 }
665
666 // Fast-locking support
667 bool is_lock_owned(address adr) const;
668
669 // Accessors for vframe array top
670 // The linked list of vframe arrays are sorted on sp. This means when we
671 // unpack the head must contain the vframe array to unpack.
672 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
673 vframeArray* vframe_array_head() const { return _vframe_array_head; }
674
675 // Side structure for deferring update of java frame locals until deopt occurs
676 JvmtiDeferredUpdates* deferred_updates() const { return _jvmti_deferred_updates; }
677 void set_deferred_updates(JvmtiDeferredUpdates* du) { _jvmti_deferred_updates = du; }
678
679 // These only really exist to make debugging deopt problems simpler
680
681 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
682 vframeArray* vframe_array_last() const { return _vframe_array_last; }
683
684 // The special resourceMark used during deoptimization
685
686 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
687 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
688
689 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; }
690 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; }
691
692 Method* callee_target() const { return _callee_target; }
693 void set_callee_target (Method* x) { _callee_target = x; }
694
695 // Oop results of vm runtime calls
696 oop vm_result() const { return _vm_result; }
697 void set_vm_result (oop x) { _vm_result = x; }
698
699 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
700
701 oop return_buffered_value() const { return _return_buffered_value; }
702 void set_return_buffered_value(oop val) { _return_buffered_value = val; }
703
704 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
705 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
706
707 #if INCLUDE_JVMCI
708 jlong pending_failed_speculation() const { return _pending_failed_speculation; }
709 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; }
710 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; }
711 void set_pending_failed_speculation(jlong failed_speculation) { _pending_failed_speculation = failed_speculation; }
712 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; }
713 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; }
714 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; }
715
716 virtual bool in_retryable_allocation() const { return _in_retryable_allocation; }
717 void set_in_retryable_allocation(bool b) { _in_retryable_allocation = b; }
718
719 JVMCIRuntime* libjvmci_runtime() const { return _libjvmci_runtime; }
720 void set_libjvmci_runtime(JVMCIRuntime* rt) {
721 assert((_libjvmci_runtime == nullptr && rt != nullptr) || (_libjvmci_runtime != nullptr && rt == nullptr), "must be");
722 _libjvmci_runtime = rt;
723 }
724 #endif // INCLUDE_JVMCI
725
726 // Exception handling for compiled methods
727 oop exception_oop() const;
728 address exception_pc() const { return _exception_pc; }
729
730 void set_exception_oop(oop o);
731 void set_exception_pc(address a) { _exception_pc = a; }
732 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
733 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
734
735 void clear_exception_oop_and_pc() {
736 set_exception_oop(NULL);
737 set_exception_pc(NULL);
738 }
739
740 // Check if address is in the usable part of the stack (excludes protected
741 // guard pages). Can be applied to any thread and is an approximation for
742 // using is_in_live_stack when the query has to happen from another thread.
743 bool is_in_usable_stack(address adr) const {
744 return is_in_stack_range_incl(adr, _stack_overflow_state.stack_reserved_zone_base());
745 }
746
747 // Misc. accessors/mutators
748 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
749 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
750 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
751
752 static ByteSize scopedValueCache_offset() { return byte_offset_of(JavaThread, _scopedValueCache); }
753
754 // For assembly stub generation
755 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
756 static ByteSize vthread_offset() { return byte_offset_of(JavaThread, _vthread); }
757 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
758 static ByteSize pending_jni_exception_check_fn_offset() {
759 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn);
760 }
761 static ByteSize last_Java_sp_offset() {
762 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
763 }
764 static ByteSize last_Java_pc_offset() {
765 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
766 }
767 static ByteSize frame_anchor_offset() {
768 return byte_offset_of(JavaThread, _anchor);
769 }
770 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
771 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
772 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
773 static ByteSize return_buffered_value_offset() { return byte_offset_of(JavaThread, _return_buffered_value); }
774 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
775 static ByteSize polling_word_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_word);}
776 static ByteSize polling_page_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_page);}
777 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
778 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
779 #if INCLUDE_JVMCI
780 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); }
781 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); }
782 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); }
783 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); }
784 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); }
785 #endif // INCLUDE_JVMCI
786 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
787 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
788 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
789 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
790
791 static ByteSize active_handles_offset() { return byte_offset_of(JavaThread, _active_handles); }
792
793 // StackOverflow offsets
794 static ByteSize stack_overflow_limit_offset() {
795 return byte_offset_of(JavaThread, _stack_overflow_state._stack_overflow_limit);
796 }
797 static ByteSize stack_guard_state_offset() {
798 return byte_offset_of(JavaThread, _stack_overflow_state._stack_guard_state);
799 }
800 static ByteSize reserved_stack_activation_offset() {
801 return byte_offset_of(JavaThread, _stack_overflow_state._reserved_stack_activation);
802 }
803 static ByteSize shadow_zone_safe_limit() {
804 return byte_offset_of(JavaThread, _stack_overflow_state._shadow_zone_safe_limit);
805 }
806 static ByteSize shadow_zone_growth_watermark() {
807 return byte_offset_of(JavaThread, _stack_overflow_state._shadow_zone_growth_watermark);
808 }
809
810 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
811
812 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
813 static ByteSize should_post_on_exceptions_flag_offset() {
814 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
815 }
816 static ByteSize doing_unsafe_access_offset() { return byte_offset_of(JavaThread, _doing_unsafe_access); }
817 NOT_PRODUCT(static ByteSize requires_cross_modify_fence_offset() { return byte_offset_of(JavaThread, _requires_cross_modify_fence); })
818
819 static ByteSize cont_entry_offset() { return byte_offset_of(JavaThread, _cont_entry); }
820 static ByteSize cont_fastpath_offset() { return byte_offset_of(JavaThread, _cont_fastpath); }
821 static ByteSize held_monitor_count_offset() { return byte_offset_of(JavaThread, _held_monitor_count); }
822
823 // Returns the jni environment for this thread
824 JNIEnv* jni_environment() { return &_jni_environment; }
825
826 // Returns the current thread as indicated by the given JNIEnv.
827 // We don't assert it is Thread::current here as that is done at the
828 // external JNI entry points where the JNIEnv is passed into the VM.
829 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
830 JavaThread* current = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
831 // We can't normally get here in a thread that has completed its
832 // execution and so "is_terminated", except when the call is from
833 // AsyncGetCallTrace, which can be triggered by a signal at any point in
834 // a thread's lifecycle. A thread is also considered terminated if the VM
835 // has exited, so we have to check this and block in case this is a daemon
836 // thread returning to the VM (the JNI DirectBuffer entry points rely on
837 // this).
838 if (current->is_terminated()) {
839 current->block_if_vm_exited();
840 }
841 return current;
842 }
843
844 // JNI critical regions. These can nest.
845 bool in_critical() { return _jni_active_critical > 0; }
846 bool in_last_critical() { return _jni_active_critical == 1; }
847 inline void enter_critical();
848 void exit_critical() {
849 assert(Thread::current() == this, "this must be current thread");
850 _jni_active_critical--;
851 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
852 }
853
854 // Checked JNI: is the programmer required to check for exceptions, if so specify
855 // which function name. Returning to a Java frame should implicitly clear the
856 // pending check, this is done for Native->Java transitions (i.e. user JNI code).
857 // VM->Java transitions are not cleared, it is expected that JNI code enclosed
858 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal).
859 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
860 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
861 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
862 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
863
864 // For deadlock detection
865 int depth_first_number() { return _depth_first_number; }
866 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
867
868 private:
869 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
870
871 public:
872 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
873 void add_monitor_chunk(MonitorChunk* chunk);
874 void remove_monitor_chunk(MonitorChunk* chunk);
875 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
876 void inc_in_deopt_handler() { _in_deopt_handler++; }
877 void dec_in_deopt_handler() {
878 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
879 if (_in_deopt_handler > 0) { // robustness
880 _in_deopt_handler--;
881 }
882 }
883
884 private:
885 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
886
887 // factor out low-level mechanics for use in both normal and error cases
888 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
889
890 public:
891
892 // Frame iteration; calls the function f for all frames on the stack
893 void frames_do(void f(frame*, const RegisterMap*));
894
895 // Memory operations
896 void oops_do_frames(OopClosure* f, CodeBlobClosure* cf);
897 void oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf);
898
899 // GC operations
900 virtual void nmethods_do(CodeBlobClosure* cf);
901
902 // RedefineClasses Support
903 void metadata_do(MetadataClosure* f);
904
905 // Debug method asserting thread states are correct during a handshake operation.
906 DEBUG_ONLY(void verify_states_for_handshake();)
907
908 // Misc. operations
909 const char* name() const;
910 const char* type_name() const { return "JavaThread"; }
911 static const char* name_for(oop thread_obj);
912
913 void print_on(outputStream* st, bool print_extended_info) const;
914 void print_on(outputStream* st) const { print_on(st, false); }
915 void print() const;
916 void print_thread_state_on(outputStream*) const;
917 void print_on_error(outputStream* st, char* buf, int buflen) const;
918 void print_name_on_error(outputStream* st, char* buf, int buflen) const;
919 void verify();
920
921 // Accessing frames
922 frame last_frame() {
923 _anchor.make_walkable();
924 return pd_last_frame();
925 }
926 javaVFrame* last_java_vframe(RegisterMap* reg_map) { return last_java_vframe(last_frame(), reg_map); }
927
928 frame carrier_last_frame(RegisterMap* reg_map);
929 javaVFrame* carrier_last_java_vframe(RegisterMap* reg_map) { return last_java_vframe(carrier_last_frame(reg_map), reg_map); }
930
931 frame vthread_last_frame();
932 javaVFrame* vthread_last_java_vframe(RegisterMap* reg_map) { return last_java_vframe(vthread_last_frame(), reg_map); }
933
934 frame platform_thread_last_frame(RegisterMap* reg_map);
935 javaVFrame* platform_thread_last_java_vframe(RegisterMap* reg_map) {
936 return last_java_vframe(platform_thread_last_frame(reg_map), reg_map);
937 }
938
939 javaVFrame* last_java_vframe(const frame f, RegisterMap* reg_map);
940
941 // Returns method at 'depth' java or native frames down the stack
942 // Used for security checks
943 Klass* security_get_caller_class(int depth);
944
945 // Print stack trace in external format
946 void print_stack_on(outputStream* st);
947 void print_stack() { print_stack_on(tty); }
948
949 // Print stack traces in various internal formats
950 void trace_stack() PRODUCT_RETURN;
951 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
952 void trace_frames() PRODUCT_RETURN;
953
954 // Print an annotated view of the stack frames
955 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
956 void validate_frame_layout() {
957 print_frame_layout(0, true);
958 }
959
960 // Function for testing deoptimization
961 void deoptimize();
962 void make_zombies();
963
964 void deoptimize_marked_methods();
965
966 public:
967 // Returns the running thread as a JavaThread
968 static JavaThread* current() {
969 return JavaThread::cast(Thread::current());
970 }
971
972 // Returns the current thread as a JavaThread, or NULL if not attached
973 static inline JavaThread* current_or_null();
974
975 // Casts
976 static JavaThread* cast(Thread* t) {
977 assert(t->is_Java_thread(), "incorrect cast to JavaThread");
978 return static_cast<JavaThread*>(t);
979 }
980
981 static const JavaThread* cast(const Thread* t) {
982 assert(t->is_Java_thread(), "incorrect cast to const JavaThread");
983 return static_cast<const JavaThread*>(t);
984 }
985
986 // Returns the active Java thread. Do not use this if you know you are calling
987 // from a JavaThread, as it's slower than JavaThread::current. If called from
988 // the VMThread, it also returns the JavaThread that instigated the VMThread's
989 // operation. You may not want that either.
990 static JavaThread* active();
991
992 protected:
993 virtual void pre_run();
994 virtual void run();
995 void thread_main_inner();
996 virtual void post_run();
997
998 public:
999 // Thread local information maintained by JVMTI.
1000 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1001 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1002 // getter is used to get this JavaThread's JvmtiThreadState if it has
1003 // one which means NULL can be returned. JvmtiThreadState::state_for()
1004 // is used to get the specified JavaThread's JvmtiThreadState if it has
1005 // one or it allocates a new JvmtiThreadState for the JavaThread and
1006 // returns it. JvmtiThreadState::state_for() will return NULL only if
1007 // the specified JavaThread is exiting.
1008 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1009 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1010
1011 #if INCLUDE_JVMTI
1012 // Rebind JVMTI thread state from carrier to virtual or from virtual to carrier.
1013 JvmtiThreadState *rebind_to_jvmti_thread_state_of(oop thread_oop);
1014 #endif
1015
1016 // JVMTI PopFrame support
1017 // Setting and clearing popframe_condition
1018 // All of these enumerated values are bits. popframe_pending
1019 // indicates that a PopFrame() has been requested and not yet been
1020 // completed. popframe_processing indicates that that PopFrame() is in
1021 // the process of being completed. popframe_force_deopt_reexecution_bit
1022 // indicates that special handling is required when returning to a
1023 // deoptimized caller.
1024 enum PopCondition {
1025 popframe_inactive = 0x00,
1026 popframe_pending_bit = 0x01,
1027 popframe_processing_bit = 0x02,
1028 popframe_force_deopt_reexecution_bit = 0x04
1029 };
1030 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1031 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1032 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1033 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1034 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1035 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1036 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1037
1038 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1039 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1040 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1041
1042 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1043 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1044 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1045
1046 private:
1047 // Saved incoming arguments to popped frame.
1048 // Used only when popped interpreted frame returns to deoptimized frame.
1049 void* _popframe_preserved_args;
1050 int _popframe_preserved_args_size;
1051
1052 public:
1053 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1054 void* popframe_preserved_args();
1055 ByteSize popframe_preserved_args_size();
1056 WordSize popframe_preserved_args_size_in_words();
1057 void popframe_free_preserved_args();
1058
1059
1060 private:
1061 JvmtiThreadState *_jvmti_thread_state;
1062
1063 // Used by the interpreter in fullspeed mode for frame pop, method
1064 // entry, method exit and single stepping support. This field is
1065 // only set to non-zero at a safepoint or using a direct handshake
1066 // (see EnterInterpOnlyModeClosure).
1067 // It can be set to zero asynchronously to this threads execution (i.e., without
1068 // safepoint/handshake or a lock) so we have to be very careful.
1069 // Accesses by other threads are synchronized using JvmtiThreadState_lock though.
1070 int _interp_only_mode;
1071
1072 public:
1073 // used by the interpreter for fullspeed debugging support (see above)
1074 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1075 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1076 int get_interp_only_mode() { return _interp_only_mode; }
1077 int set_interp_only_mode(int val) { return _interp_only_mode = val; }
1078 void increment_interp_only_mode() { ++_interp_only_mode; }
1079 void decrement_interp_only_mode() { --_interp_only_mode; }
1080
1081 // support for cached flag that indicates whether exceptions need to be posted for this thread
1082 // if this is false, we can avoid deoptimizing when events are thrown
1083 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1084 private:
1085 int _should_post_on_exceptions_flag;
1086
1087 public:
1088 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1089
1090 private:
1091 ThreadStatistics *_thread_stat;
1092
1093 public:
1094 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1095
1096 // Return a blocker object for which this thread is blocked parking.
1097 oop current_park_blocker();
1098
1099 private:
1100 static size_t _stack_size_at_create;
1101
1102 public:
1103 static inline size_t stack_size_at_create(void) {
1104 return _stack_size_at_create;
1105 }
1106 static inline void set_stack_size_at_create(size_t value) {
1107 _stack_size_at_create = value;
1108 }
1109
1110 // Machine dependent stuff
1111 #include OS_CPU_HEADER(javaThread)
1112
1113 // JSR166 per-thread parker
1114 private:
1115 Parker _parker;
1116 public:
1117 Parker* parker() { return &_parker; }
1118
1119 public:
1120 // clearing/querying jni attach status
1121 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1122 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1123 inline void set_done_attaching_via_jni();
1124
1125 // Stack dump assistance:
1126 // Track the class we want to initialize but for which we have to wait
1127 // on its init_lock() because it is already being initialized.
1128 void set_class_to_be_initialized(InstanceKlass* k);
1129 InstanceKlass* class_to_be_initialized() const;
1130
1131 private:
1132 InstanceKlass* _class_to_be_initialized;
1133
1134 // java.lang.Thread.sleep support
1135 ParkEvent * _SleepEvent;
1136 public:
1137 bool sleep(jlong millis);
1138
1139 // java.lang.Thread interruption support
1140 void interrupt();
1141 bool is_interrupted(bool clear_interrupted);
1142
1143 static OopStorage* thread_oop_storage();
1144
1145 static void verify_cross_modify_fence_failure(JavaThread *thread) PRODUCT_RETURN;
1146
1147 // Helper function to create the java.lang.Thread object for a
1148 // VM-internal thread. The thread will have the given name, be
1149 // part of the System ThreadGroup and if is_visible is true will be
1150 // discoverable via the system ThreadGroup.
1151 static Handle create_system_thread_object(const char* name, bool is_visible, TRAPS);
1152
1153 // Helper function to start a VM-internal daemon thread.
1154 // E.g. ServiceThread, NotificationThread, CompilerThread etc.
1155 static void start_internal_daemon(JavaThread* current, JavaThread* target,
1156 Handle thread_oop, ThreadPriority prio);
1157
1158 // Helper function to do vm_exit_on_initialization for osthread
1159 // resource allocation failure.
1160 static void vm_exit_on_osthread_failure(JavaThread* thread);
1161
1162 // Deferred OopHandle release support
1163 private:
1164 // List of OopHandles to be released - guarded by the Service_lock.
1165 static OopHandleList* _oop_handle_list;
1166 // Add our OopHandles to the list for the service thread to release.
1167 void add_oop_handles_for_release();
1168 // Called by the ServiceThread to release the OopHandles.
1169 static void release_oop_handles();
1170 // Called by the ServiceThread to poll if there are any OopHandles to release.
1171 // Called when holding the Service_lock.
1172 static bool has_oop_handles_to_release() {
1173 return _oop_handle_list != nullptr;
1174 }
1175 };
1176
1177 inline JavaThread* JavaThread::current_or_null() {
1178 Thread* current = Thread::current_or_null();
1179 return current != nullptr ? JavaThread::cast(current) : nullptr;
1180 }
1181
1182 class UnlockFlagSaver {
1183 private:
1184 JavaThread* _thread;
1185 bool _do_not_unlock;
1186 public:
1187 UnlockFlagSaver(JavaThread* t) {
1188 _thread = t;
1189 _do_not_unlock = t->do_not_unlock_if_synchronized();
1190 t->set_do_not_unlock_if_synchronized(false);
1191 }
1192 ~UnlockFlagSaver() {
1193 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
1194 }
1195 };
1196
1197 class JNIHandleMark : public StackObj {
1198 JavaThread* _thread;
1199 public:
1200 JNIHandleMark(JavaThread* thread) : _thread(thread) {
1201 thread->push_jni_handle_block();
1202 }
1203 ~JNIHandleMark() { _thread->pop_jni_handle_block(); }
1204 };
1205
1206 #endif // SHARE_RUNTIME_JAVATHREAD_HPP