1 /*
2 * Copyright (c) 1997, 2023, 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
144 // See ReduceInitialCardMarks: this holds the precise space interval of
145 // the most recent slow path allocation for which compiled code has
146 // elided card-marks for performance along the fast-path.
147 MemRegion _deferred_card_mark;
148
149 ObjectMonitor* volatile _current_pending_monitor; // ObjectMonitor this thread is waiting to lock
150 bool _current_pending_monitor_is_from_java; // locking is from Java code
151 ObjectMonitor* volatile _current_waiting_monitor; // ObjectMonitor on which this thread called Object.wait()
152
153 // Active_handles points to a block of handles
154 JNIHandleBlock* _active_handles;
155
156 // One-element thread local free list
157 JNIHandleBlock* _free_handle_block;
158
159 public:
160 volatile intptr_t _Stalled;
161
162 // For tracking the heavyweight monitor the thread is pending on.
163 ObjectMonitor* current_pending_monitor() {
164 // Use Atomic::load() to prevent data race between concurrent modification and
165 // concurrent readers, e.g. ThreadService::get_current_contended_monitor().
166 // Especially, reloading pointer from thread after null check must be prevented.
167 return Atomic::load(&_current_pending_monitor);
168 }
169 void set_current_pending_monitor(ObjectMonitor* monitor) {
170 Atomic::store(&_current_pending_monitor, monitor);
171 }
172 void set_current_pending_monitor_is_from_java(bool from_java) {
173 _current_pending_monitor_is_from_java = from_java;
174 }
175 bool current_pending_monitor_is_from_java() {
176 return _current_pending_monitor_is_from_java;
177 }
178 ObjectMonitor* current_waiting_monitor() {
179 // See the comment in current_pending_monitor() above.
180 return Atomic::load(&_current_waiting_monitor);
181 }
182 void set_current_waiting_monitor(ObjectMonitor* monitor) {
183 Atomic::store(&_current_waiting_monitor, monitor);
184 }
185
186 // JNI handle support
187 JNIHandleBlock* active_handles() const { return _active_handles; }
188 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
189 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
190 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
191
192 void push_jni_handle_block();
193 void pop_jni_handle_block();
194
195 private:
196 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
197 // allocated during deoptimization
198 // and by JNI_MonitorEnter/Exit
199
200 enum SuspendFlags {
201 // NOTE: avoid using the sign-bit as cc generates different test code
202 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
203 _trace_flag = 0x00000004U, // call tracing backend
204 _obj_deopt = 0x00000008U // suspend for object reallocation and relocking for JVMTI agent
205 };
206
207 // various suspension related flags - atomically updated
208 volatile uint32_t _suspend_flags;
209
210 inline void set_suspend_flag(SuspendFlags f);
211 inline void clear_suspend_flag(SuspendFlags f);
212
213 public:
214 inline void set_trace_flag();
215 inline void clear_trace_flag();
216 inline void set_obj_deopt_flag();
217 inline void clear_obj_deopt_flag();
218 bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; }
219 bool is_obj_deopt_suspend() { return (_suspend_flags & _obj_deopt) != 0; }
220
221 // Asynchronous exception support
222 private:
223 friend class InstallAsyncExceptionHandshake;
224 friend class AsyncExceptionHandshake;
225 friend class HandshakeState;
226
227 void install_async_exception(AsyncExceptionHandshake* aec = nullptr);
228 void handle_async_exception(oop java_throwable);
229 public:
230 bool has_async_exception_condition();
231 inline void set_pending_unsafe_access_error();
232 static void send_async_exception(JavaThread* jt, oop java_throwable);
233
234 class NoAsyncExceptionDeliveryMark : public StackObj {
235 friend JavaThread;
236 JavaThread *_target;
237 inline NoAsyncExceptionDeliveryMark(JavaThread *t);
238 inline ~NoAsyncExceptionDeliveryMark();
239 };
240
241 // Safepoint support
242 public: // Expose _thread_state for SafeFetchInt()
243 volatile JavaThreadState _thread_state;
244 private:
245 SafepointMechanism::ThreadData _poll_data;
246 ThreadSafepointState* _safepoint_state; // Holds information about a thread during a safepoint
247 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
248 NOT_PRODUCT(bool _requires_cross_modify_fence;) // State used by VerifyCrossModifyFence
249 #ifdef ASSERT
250 // Debug support for checking if code allows safepoints or not.
251 // Safepoints in the VM can happen because of allocation, invoking a VM operation, or blocking on
252 // mutex, or blocking on an object synchronizer (Java locking).
253 // If _no_safepoint_count is non-zero, then an assertion failure will happen in any of
254 // the above cases. The class NoSafepointVerifier is used to set this counter.
255 int _no_safepoint_count; // If 0, thread allow a safepoint to happen
256
257 public:
258 void inc_no_safepoint_count() { _no_safepoint_count++; }
259 void dec_no_safepoint_count() { _no_safepoint_count--; }
260 #endif // ASSERT
261 public:
262 // These functions check conditions before possibly going to a safepoint.
263 // including NoSafepointVerifier.
264 void check_for_valid_safepoint_state() NOT_DEBUG_RETURN;
265 void check_possible_safepoint() NOT_DEBUG_RETURN;
266
267 #ifdef ASSERT
268 private:
269 volatile uint64_t _visited_for_critical_count;
270
271 public:
272 void set_visited_for_critical_count(uint64_t safepoint_id) {
273 assert(_visited_for_critical_count == 0, "Must be reset before set");
274 assert((safepoint_id & 0x1) == 1, "Must be odd");
275 _visited_for_critical_count = safepoint_id;
276 }
277 void reset_visited_for_critical_count(uint64_t safepoint_id) {
278 assert(_visited_for_critical_count == safepoint_id, "Was not visited");
279 _visited_for_critical_count = 0;
280 }
281 bool was_visited_for_critical_count(uint64_t safepoint_id) const {
282 return _visited_for_critical_count == safepoint_id;
283 }
284 #endif // ASSERT
285
286 // JavaThread termination support
287 public:
288 enum TerminatedTypes {
289 _not_terminated = 0xDEAD - 3,
290 _thread_exiting, // JavaThread::exit() has been called for this thread
291 _thread_gc_barrier_detached, // thread's GC barrier has been detached
292 _thread_terminated, // JavaThread is removed from thread list
293 _vm_exited // JavaThread is still executing native code, but VM is terminated
294 // only VM_Exit can set _vm_exited
295 };
296
297 private:
298 // In general a JavaThread's _terminated field transitions as follows:
299 //
300 // _not_terminated => _thread_exiting => _thread_gc_barrier_detached => _thread_terminated
301 //
302 // _vm_exited is a special value to cover the case of a JavaThread
303 // executing native code after the VM itself is terminated.
304 //
305 // A JavaThread that fails to JNI attach has these _terminated field transitions:
306 // _not_terminated => _thread_terminated
307 //
308 volatile TerminatedTypes _terminated;
309
310 jint _in_deopt_handler; // count of deoptimization
311 // handlers thread is in
312 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
313 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
314 // never locked) when throwing an exception. Used by interpreter only.
315 #if INCLUDE_JVMTI
316 volatile bool _carrier_thread_suspended; // Carrier thread is externally suspended
317 bool _is_in_VTMS_transition; // thread is in virtual thread mount state transition
318 bool _is_in_tmp_VTMS_transition; // thread is in temporary virtual thread mount state transition
319 #ifdef ASSERT
320 bool _is_VTMS_transition_disabler; // thread currently disabled VTMS transitions
321 #endif
322 #endif
323
324 // JNI attach states:
325 enum JNIAttachStates {
326 _not_attaching_via_jni = 1, // thread is not attaching via JNI
327 _attaching_via_jni, // thread is attaching via JNI
328 _attached_via_jni // thread has attached via JNI
329 };
330
331 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
332 // A native thread that is attaching via JNI starts with a value
333 // of _attaching_via_jni and transitions to _attached_via_jni.
334 volatile JNIAttachStates _jni_attach_state;
335
336
337 #if INCLUDE_JVMCI
338 // The _pending_* fields below are used to communicate extra information
339 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler.
340
341 // Communicates the DeoptReason and DeoptAction of the uncommon trap
342 int _pending_deoptimization;
343
344 // Specifies whether the uncommon trap is to bci 0 of a synchronized method
345 // before the monitor has been acquired.
346 bool _pending_monitorenter;
347
348 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter
349 bool _pending_transfer_to_interpreter;
350
351 // True if in a runtime call from compiled code that will deoptimize
352 // and re-execute a failed heap allocation in the interpreter.
353 bool _in_retryable_allocation;
354
355 // An id of a speculation that JVMCI compiled code can use to further describe and
356 // uniquely identify the speculative optimization guarded by an uncommon trap.
357 // See JVMCINMethodData::SPECULATION_LENGTH_BITS for further details.
358 jlong _pending_failed_speculation;
359
360 // These fields are mutually exclusive in terms of live ranges.
361 union {
362 // Communicates the pc at which the most recent implicit exception occurred
363 // from the signal handler to a deoptimization stub.
364 address _implicit_exception_pc;
365
366 // Communicates an alternative call target to an i2c stub from a JavaCall .
367 address _alternate_call_target;
368 } _jvmci;
369
370 // The JVMCIRuntime in a JVMCI shared library
371 JVMCIRuntime* _libjvmci_runtime;
372
373 // Support for high precision, thread sensitive counters in JVMCI compiled code.
374 jlong* _jvmci_counters;
375
376 // Fast thread locals for use by JVMCI
377 jlong _jvmci_reserved0;
378 jlong _jvmci_reserved1;
379 oop _jvmci_reserved_oop0;
380
381 public:
382 static jlong* _jvmci_old_thread_counters;
383 static void collect_counters(jlong* array, int length);
384
385 bool resize_counters(int current_size, int new_size);
386
387 static bool resize_all_jvmci_counters(int new_size);
388
389 void set_jvmci_reserved_oop0(oop value) {
390 _jvmci_reserved_oop0 = value;
391 }
392
393 oop get_jvmci_reserved_oop0() {
394 return _jvmci_reserved_oop0;
395 }
396
397 void set_jvmci_reserved0(jlong value) {
398 _jvmci_reserved0 = value;
399 }
400
401 jlong get_jvmci_reserved0() {
402 return _jvmci_reserved0;
403 }
404
405 void set_jvmci_reserved1(jlong value) {
406 _jvmci_reserved1 = value;
407 }
408
409 jlong get_jvmci_reserved1() {
410 return _jvmci_reserved1;
411 }
412
413 private:
414 #endif // INCLUDE_JVMCI
415
416 StackOverflow _stack_overflow_state;
417
418 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
419 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
420 // code)
421 volatile oop _exception_oop; // Exception thrown in compiled code
422 volatile address _exception_pc; // PC where exception happened
423 volatile address _exception_handler_pc; // PC for handler of exception
424 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
425
426 private:
427 // support for JNI critical regions
428 jint _jni_active_critical; // count of entries into JNI critical region
429
430 // Checked JNI: function name requires exception check
431 char* _pending_jni_exception_check_fn;
432
433 // For deadlock detection.
434 int _depth_first_number;
435
436 // JVMTI PopFrame support
437 // This is set to popframe_pending to signal that top Java frame should be popped immediately
438 int _popframe_condition;
439
440 // If reallocation of scalar replaced objects fails, we throw OOM
441 // and during exception propagation, pop the top
442 // _frames_to_pop_failed_realloc frames, the ones that reference
443 // failed reallocations.
444 int _frames_to_pop_failed_realloc;
445
446 ContinuationEntry* _cont_entry;
447 intptr_t* _cont_fastpath; // the sp of the oldest known interpreted/call_stub frame inside the
448 // continuation that we know about
449 int _cont_fastpath_thread_state; // whether global thread state allows continuation fastpath (JVMTI)
450 // It's signed for error detection.
451 #ifdef _LP64
452 int64_t _held_monitor_count; // used by continuations for fast lock detection
453 int64_t _jni_monitor_count;
454 #else
455 int32_t _held_monitor_count; // used by continuations for fast lock detection
456 int32_t _jni_monitor_count;
457 #endif
458
459 private:
460
461 friend class VMThread;
462 friend class ThreadWaitTransition;
463 friend class VM_Exit;
464
465 // Stack watermark barriers.
466 StackWatermarks _stack_watermarks;
467
468 public:
469 inline StackWatermarks* stack_watermarks() { return &_stack_watermarks; }
470
471 public:
472 // Constructor
473 JavaThread(); // delegating constructor
474 JavaThread(bool is_attaching_via_jni); // for main thread and JNI attached threads
475 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
476 ~JavaThread();
477
478 #ifdef ASSERT
479 // verify this JavaThread hasn't be published in the Threads::list yet
480 void verify_not_published();
481 #endif // ASSERT
482
483 StackOverflow* stack_overflow_state() { return &_stack_overflow_state; }
484
485 //JNI functiontable getter/setter for JVMTI jni function table interception API.
486 void set_jni_functions(struct JNINativeInterface_* functionTable) {
487 _jni_environment.functions = functionTable;
488 }
489 struct JNINativeInterface_* get_jni_functions() {
490 return (struct JNINativeInterface_ *)_jni_environment.functions;
491 }
492
493 // This function is called at thread creation to allow
494 // platform specific thread variables to be initialized.
495 void cache_global_variables();
496
497 // Executes Shutdown.shutdown()
498 void invoke_shutdown_hooks();
499
500 // Cleanup on thread exit
501 enum ExitType {
502 normal_exit,
503 jni_detach
504 };
505 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
506
507 void cleanup_failed_attach_current_thread(bool is_daemon);
508
509 // Testers
510 virtual bool is_Java_thread() const { return true; }
511 virtual bool can_call_java() const { return true; }
512
513 virtual bool is_active_Java_thread() const {
514 return on_thread_list() && !is_terminated();
515 }
516
517 // Thread oop. threadObj() can be null for initial JavaThread
518 // (or for threads attached via JNI)
519 oop threadObj() const;
520 void set_threadOopHandles(oop p);
521 oop vthread() const;
522 void set_vthread(oop p);
523 oop scopedValueCache() const;
524 void set_scopedValueCache(oop p);
525 void clear_scopedValueBindings();
526 oop jvmti_vthread() const;
527 void set_jvmti_vthread(oop p);
528
529 // Prepare thread and add to priority queue. If a priority is
530 // not specified, use the priority of the thread object. Threads_lock
531 // must be held while this function is called.
532 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
533
534 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
535 address saved_exception_pc() { return _saved_exception_pc; }
536
537 ThreadFunction entry_point() const { return _entry_point; }
538
539 // Allocates a new Java level thread object for this thread. thread_name may be null.
540 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS);
541
542 // Last frame anchor routines
543
544 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
545
546 // last_Java_sp
547 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
548 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
549
550 // last_Java_pc
551
552 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
553
554 // Safepoint support
555 inline JavaThreadState thread_state() const;
556 inline void set_thread_state(JavaThreadState s);
557 inline void set_thread_state_fence(JavaThreadState s); // fence after setting thread state
558 inline ThreadSafepointState* safepoint_state() const;
559 inline void set_safepoint_state(ThreadSafepointState* state);
560 inline bool is_at_poll_safepoint();
561
562 // JavaThread termination and lifecycle support:
563 void smr_delete();
564 bool on_thread_list() const { return _on_thread_list; }
565 void set_on_thread_list() { _on_thread_list = true; }
566
567 // thread has called JavaThread::exit(), thread's GC barrier is detached
568 // or thread is terminated
569 bool is_exiting() const;
570 // thread's GC barrier is NOT detached and thread is NOT terminated
571 bool is_oop_safe() const;
572 // thread is terminated (no longer on the threads list); the thread must
573 // be protected by a ThreadsListHandle to avoid potential crashes.
574 bool check_is_terminated(TerminatedTypes l_terminated) const {
575 return l_terminated == _thread_terminated || l_terminated == _vm_exited;
576 }
577 bool is_terminated() const;
578 void set_terminated(TerminatedTypes t);
579
580 void block_if_vm_exited();
581
582 bool doing_unsafe_access() { return _doing_unsafe_access; }
583 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
584
585 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
586 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
587
588 SafepointMechanism::ThreadData* poll_data() { return &_poll_data; }
589
590 void set_requires_cross_modify_fence(bool val) PRODUCT_RETURN NOT_PRODUCT({ _requires_cross_modify_fence = val; })
591
592 // Continuation support
593 ContinuationEntry* last_continuation() const { return _cont_entry; }
594 void set_cont_fastpath(intptr_t* x) { _cont_fastpath = x; }
595 void push_cont_fastpath(intptr_t* sp) { if (sp > _cont_fastpath) _cont_fastpath = sp; }
596 void set_cont_fastpath_thread_state(bool x) { _cont_fastpath_thread_state = (int)x; }
597 intptr_t* raw_cont_fastpath() const { return _cont_fastpath; }
598 bool cont_fastpath() const { return _cont_fastpath == nullptr && _cont_fastpath_thread_state != 0; }
599 bool cont_fastpath_thread_state() const { return _cont_fastpath_thread_state != 0; }
600
601 void inc_held_monitor_count(int i = 1, bool jni = false);
602 void dec_held_monitor_count(int i = 1, bool jni = false);
603
604 int64_t held_monitor_count() { return (int64_t)_held_monitor_count; }
605 int64_t jni_monitor_count() { return (int64_t)_jni_monitor_count; }
606 void clear_jni_monitor_count() { _jni_monitor_count = 0; }
607
608 inline bool is_vthread_mounted() const;
609 inline const ContinuationEntry* vthread_continuation() const;
610
611 private:
612 DEBUG_ONLY(void verify_frame_info();)
613
614 // Support for thread handshake operations
615 HandshakeState _handshake;
616 public:
617 HandshakeState* handshake_state() { return &_handshake; }
618
619 // A JavaThread can always safely operate on it self and other threads
620 // can do it safely if they are the active handshaker.
621 bool is_handshake_safe_for(Thread* th) const {
622 return _handshake.active_handshaker() == th || this == th;
623 }
624
625 // Suspend/resume support for JavaThread
626 // higher-level suspension/resume logic called by the public APIs
627 bool java_suspend();
628 bool java_resume();
629 bool is_suspended() { return _handshake.is_suspended(); }
630
631 // Check for async exception in addition to safepoint.
632 static void check_special_condition_for_native_trans(JavaThread *thread);
633
634 // Synchronize with another thread that is deoptimizing objects of the
635 // current thread, i.e. reverts optimizations based on escape analysis.
636 void wait_for_object_deoptimization();
637
638 #if INCLUDE_JVMTI
639 inline void set_carrier_thread_suspended();
640 inline void clear_carrier_thread_suspended();
641
642 bool is_carrier_thread_suspended() const {
643 return _carrier_thread_suspended;
644 }
645
646 bool is_in_VTMS_transition() const { return _is_in_VTMS_transition; }
647 bool is_in_tmp_VTMS_transition() const { return _is_in_tmp_VTMS_transition; }
648 bool is_in_any_VTMS_transition() const { return _is_in_VTMS_transition || _is_in_tmp_VTMS_transition; }
649
650 void set_is_in_VTMS_transition(bool val);
651 void toggle_is_in_tmp_VTMS_transition() { _is_in_tmp_VTMS_transition = !_is_in_tmp_VTMS_transition; };
652
653 #ifdef ASSERT
654 bool is_VTMS_transition_disabler() const { return _is_VTMS_transition_disabler; }
655 void set_is_VTMS_transition_disabler(bool val);
656 #endif
657 #endif
658
659 // Support for object deoptimization and JFR suspension
660 void handle_special_runtime_exit_condition();
661 bool has_special_runtime_exit_condition() {
662 return (_suspend_flags & (_obj_deopt JFR_ONLY(| _trace_flag))) != 0;
663 }
664
665 // Fast-locking support
666 bool is_lock_owned(address adr) const;
667
668 // Accessors for vframe array top
669 // The linked list of vframe arrays are sorted on sp. This means when we
670 // unpack the head must contain the vframe array to unpack.
671 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
672 vframeArray* vframe_array_head() const { return _vframe_array_head; }
673
674 // Side structure for deferring update of java frame locals until deopt occurs
675 JvmtiDeferredUpdates* deferred_updates() const { return _jvmti_deferred_updates; }
676 void set_deferred_updates(JvmtiDeferredUpdates* du) { _jvmti_deferred_updates = du; }
677
678 // These only really exist to make debugging deopt problems simpler
679
680 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
681 vframeArray* vframe_array_last() const { return _vframe_array_last; }
682
683 // The special resourceMark used during deoptimization
684
685 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
686 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
687
688 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; }
689 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; }
690
691 Method* callee_target() const { return _callee_target; }
692 void set_callee_target (Method* x) { _callee_target = x; }
693
694 // Oop results of vm runtime calls
695 oop vm_result() const { return _vm_result; }
696 void set_vm_result (oop x) { _vm_result = x; }
697
698 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
699
700 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
701 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
702
703 #if INCLUDE_JVMCI
704 jlong pending_failed_speculation() const { return _pending_failed_speculation; }
705 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; }
706 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; }
707 void set_pending_failed_speculation(jlong failed_speculation) { _pending_failed_speculation = failed_speculation; }
708 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; }
709 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == nullptr, "must be"); _jvmci._alternate_call_target = a; }
710 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == nullptr, "must be"); _jvmci._implicit_exception_pc = a; }
711
712 virtual bool in_retryable_allocation() const { return _in_retryable_allocation; }
713 void set_in_retryable_allocation(bool b) { _in_retryable_allocation = b; }
714
715 JVMCIRuntime* libjvmci_runtime() const { return _libjvmci_runtime; }
716 void set_libjvmci_runtime(JVMCIRuntime* rt) {
717 assert((_libjvmci_runtime == nullptr && rt != nullptr) || (_libjvmci_runtime != nullptr && rt == nullptr), "must be");
718 _libjvmci_runtime = rt;
719 }
720 #endif // INCLUDE_JVMCI
721
722 // Exception handling for compiled methods
723 oop exception_oop() const;
724 address exception_pc() const { return _exception_pc; }
725
726 void set_exception_oop(oop o);
727 void set_exception_pc(address a) { _exception_pc = a; }
728 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
729 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
730
731 void clear_exception_oop_and_pc() {
732 set_exception_oop(nullptr);
733 set_exception_pc(nullptr);
734 }
735
736 // Check if address is in the usable part of the stack (excludes protected
737 // guard pages). Can be applied to any thread and is an approximation for
738 // using is_in_live_stack when the query has to happen from another thread.
739 bool is_in_usable_stack(address adr) const {
740 return is_in_stack_range_incl(adr, _stack_overflow_state.stack_reserved_zone_base());
741 }
742
743 // Misc. accessors/mutators
744 static ByteSize scopedValueCache_offset() { return byte_offset_of(JavaThread, _scopedValueCache); }
745
746 // For assembly stub generation
747 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
748 static ByteSize vthread_offset() { return byte_offset_of(JavaThread, _vthread); }
749 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
750 static ByteSize pending_jni_exception_check_fn_offset() {
751 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn);
752 }
753 static ByteSize last_Java_sp_offset() {
754 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
755 }
756 static ByteSize last_Java_pc_offset() {
757 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
758 }
759 static ByteSize frame_anchor_offset() {
760 return byte_offset_of(JavaThread, _anchor);
761 }
762 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
763 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
764 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
765 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
766 static ByteSize polling_word_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_word);}
767 static ByteSize polling_page_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_page);}
768 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
769 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
770 #if INCLUDE_JVMCI
771 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); }
772 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); }
773 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); }
774 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); }
775 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); }
776 #endif // INCLUDE_JVMCI
777 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
778 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
779 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
780 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
781
782 static ByteSize active_handles_offset() { return byte_offset_of(JavaThread, _active_handles); }
783
784 // StackOverflow offsets
785 static ByteSize stack_overflow_limit_offset() {
786 return byte_offset_of(JavaThread, _stack_overflow_state._stack_overflow_limit);
787 }
788 static ByteSize stack_guard_state_offset() {
789 return byte_offset_of(JavaThread, _stack_overflow_state._stack_guard_state);
790 }
791 static ByteSize reserved_stack_activation_offset() {
792 return byte_offset_of(JavaThread, _stack_overflow_state._reserved_stack_activation);
793 }
794 static ByteSize shadow_zone_safe_limit() {
795 return byte_offset_of(JavaThread, _stack_overflow_state._shadow_zone_safe_limit);
796 }
797 static ByteSize shadow_zone_growth_watermark() {
798 return byte_offset_of(JavaThread, _stack_overflow_state._shadow_zone_growth_watermark);
799 }
800
801 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
802
803 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
804 static ByteSize should_post_on_exceptions_flag_offset() {
805 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
806 }
807 static ByteSize doing_unsafe_access_offset() { return byte_offset_of(JavaThread, _doing_unsafe_access); }
808 NOT_PRODUCT(static ByteSize requires_cross_modify_fence_offset() { return byte_offset_of(JavaThread, _requires_cross_modify_fence); })
809
810 static ByteSize cont_entry_offset() { return byte_offset_of(JavaThread, _cont_entry); }
811 static ByteSize cont_fastpath_offset() { return byte_offset_of(JavaThread, _cont_fastpath); }
812 static ByteSize held_monitor_count_offset() { return byte_offset_of(JavaThread, _held_monitor_count); }
813
814 // Returns the jni environment for this thread
815 JNIEnv* jni_environment() { return &_jni_environment; }
816
817 // Returns the current thread as indicated by the given JNIEnv.
818 // We don't assert it is Thread::current here as that is done at the
819 // external JNI entry points where the JNIEnv is passed into the VM.
820 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
821 JavaThread* current = reinterpret_cast<JavaThread*>(((intptr_t)env - in_bytes(jni_environment_offset())));
822 // We can't normally get here in a thread that has completed its
823 // execution and so "is_terminated", except when the call is from
824 // AsyncGetCallTrace, which can be triggered by a signal at any point in
825 // a thread's lifecycle. A thread is also considered terminated if the VM
826 // has exited, so we have to check this and block in case this is a daemon
827 // thread returning to the VM (the JNI DirectBuffer entry points rely on
828 // this).
829 if (current->is_terminated()) {
830 current->block_if_vm_exited();
831 }
832 return current;
833 }
834
835 // JNI critical regions. These can nest.
836 bool in_critical() { return _jni_active_critical > 0; }
837 bool in_last_critical() { return _jni_active_critical == 1; }
838 inline void enter_critical();
839 void exit_critical() {
840 assert(Thread::current() == this, "this must be current thread");
841 _jni_active_critical--;
842 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
843 }
844
845 // Checked JNI: is the programmer required to check for exceptions, if so specify
846 // which function name. Returning to a Java frame should implicitly clear the
847 // pending check, this is done for Native->Java transitions (i.e. user JNI code).
848 // VM->Java transitions are not cleared, it is expected that JNI code enclosed
849 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal).
850 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != nullptr; }
851 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = nullptr; }
852 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
853 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
854
855 // For deadlock detection
856 int depth_first_number() { return _depth_first_number; }
857 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
858
859 private:
860 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
861
862 public:
863 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
864 void add_monitor_chunk(MonitorChunk* chunk);
865 void remove_monitor_chunk(MonitorChunk* chunk);
866 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
867 void inc_in_deopt_handler() { _in_deopt_handler++; }
868 void dec_in_deopt_handler() {
869 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
870 if (_in_deopt_handler > 0) { // robustness
871 _in_deopt_handler--;
872 }
873 }
874
875 private:
876 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
877
878 // factor out low-level mechanics for use in both normal and error cases
879 const char* get_thread_name_string(char* buf = nullptr, int buflen = 0) const;
880
881 public:
882
883 // Frame iteration; calls the function f for all frames on the stack
884 void frames_do(void f(frame*, const RegisterMap*));
885
886 // Memory operations
887 void oops_do_frames(OopClosure* f, CodeBlobClosure* cf);
888 void oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf);
889
890 // GC operations
891 virtual void nmethods_do(CodeBlobClosure* cf);
892
893 // RedefineClasses Support
894 void metadata_do(MetadataClosure* f);
895
896 // Debug method asserting thread states are correct during a handshake operation.
897 DEBUG_ONLY(void verify_states_for_handshake();)
898
899 // Misc. operations
900 const char* name() const;
901 const char* type_name() const { return "JavaThread"; }
902 static const char* name_for(oop thread_obj);
903
904 void print_on(outputStream* st, bool print_extended_info) const;
905 void print_on(outputStream* st) const { print_on(st, false); }
906 void print() const;
907 void print_thread_state_on(outputStream*) const;
908 void print_on_error(outputStream* st, char* buf, int buflen) const;
909 void print_name_on_error(outputStream* st, char* buf, int buflen) const;
910 void verify();
911
912 // Accessing frames
913 frame last_frame() {
914 _anchor.make_walkable();
915 return pd_last_frame();
916 }
917 javaVFrame* last_java_vframe(RegisterMap* reg_map) { return last_java_vframe(last_frame(), reg_map); }
918
919 frame carrier_last_frame(RegisterMap* reg_map);
920 javaVFrame* carrier_last_java_vframe(RegisterMap* reg_map) { return last_java_vframe(carrier_last_frame(reg_map), reg_map); }
921
922 frame vthread_last_frame();
923 javaVFrame* vthread_last_java_vframe(RegisterMap* reg_map) { return last_java_vframe(vthread_last_frame(), reg_map); }
924
925 frame platform_thread_last_frame(RegisterMap* reg_map);
926 javaVFrame* platform_thread_last_java_vframe(RegisterMap* reg_map) {
927 return last_java_vframe(platform_thread_last_frame(reg_map), reg_map);
928 }
929
930 javaVFrame* last_java_vframe(const frame f, RegisterMap* reg_map);
931
932 // Returns method at 'depth' java or native frames down the stack
933 // Used for security checks
934 Klass* security_get_caller_class(int depth);
935
936 // Print stack trace in external format
937 // These variants print carrier/platform thread information only.
938 void print_stack_on(outputStream* st);
939 void print_stack() { print_stack_on(tty); }
940 // This prints the currently mounted virtual thread.
941 void print_vthread_stack_on(outputStream* st);
942 // This prints the active stack: either carrier/platform or virtual.
943 void print_active_stack_on(outputStream* st);
944 // Print current stack trace for checked JNI warnings and JNI fatal errors.
945 // This is the external format from above, but selecting the platform
946 // or vthread as applicable.
947 void print_jni_stack();
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 nullptr 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