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 OopStorage;
63 class OSThread;
64
65 class ThreadsList;
66 class ThreadSafepointState;
67 class ThreadStatistics;
68
69 class vframeArray;
70 class vframe;
71 class javaVFrame;
72
73 class JavaThread;
74 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
75
76 class JavaThread: public Thread {
77 friend class VMStructs;
78 friend class JVMCIVMStructs;
79 friend class WhiteBox;
80 friend class ThreadsSMRSupport; // to access _threadObj for exiting_threads_oops_do
81 friend class HandshakeState;
82 friend class Continuation;
83 friend class Threads;
84 private:
85 bool _in_asgct; // Is set when this JavaThread is handling ASGCT call
86 bool _on_thread_list; // Is set when this JavaThread is added to the Threads list
87 OopHandle _threadObj; // The Java level thread object
88 OopHandle _vthread; // the value returned by Thread.currentThread(): the virtual thread, if mounted, otherwise _threadObj
89 OopHandle _jvmti_vthread;
90 OopHandle _extentLocalCache;
91
92 static OopStorage* _thread_oop_storage;
93
94 #ifdef ASSERT
95 private:
96 int _java_call_counter;
97
98 public:
99 int java_call_counter() { return _java_call_counter; }
100 void inc_java_call_counter() { _java_call_counter++; }
101 void dec_java_call_counter() {
102 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
103 _java_call_counter--;
104 }
105 private: // restore original namespace restriction
106 #endif // ifdef ASSERT
107
108 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
109
110 ThreadFunction _entry_point;
111
112 JNIEnv _jni_environment;
113
114 // Deopt support
115 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
116
117 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized
118 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
119 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
120 // Holds updates by JVMTI agents for compiled frames that cannot be performed immediately. They
121 // will be carried out as soon as possible which, in most cases, is just before deoptimization of
122 // the frame, when control returns to it.
123 JvmtiDeferredUpdates* _jvmti_deferred_updates;
124
125 // Handshake value for fixing 6243940. We need a place for the i2c
126 // adapter to store the callee Method*. This value is NEVER live
127 // across a gc point so it does NOT have to be gc'd
128 // The handshake is open ended since we can't be certain that it will
129 // be NULLed. This is because we rarely ever see the race and end up
130 // in handle_wrong_method which is the backend of the handshake. See
131 // code in i2c adapters and handle_wrong_method.
132
133 Method* _callee_target;
134
135 // Used to pass back results to the interpreter or generated code running Java code.
136 oop _vm_result; // oop result is GC-preserved
137 Metadata* _vm_result_2; // non-oop result
138 oop _return_buffered_value; // buffered value being returned
139
140 // See ReduceInitialCardMarks: this holds the precise space interval of
141 // the most recent slow path allocation for which compiled code has
142 // elided card-marks for performance along the fast-path.
143 MemRegion _deferred_card_mark;
144
145 ObjectMonitor* volatile _current_pending_monitor; // ObjectMonitor this thread is waiting to lock
146 bool _current_pending_monitor_is_from_java; // locking is from Java code
147 ObjectMonitor* volatile _current_waiting_monitor; // ObjectMonitor on which this thread called Object.wait()
148
149 // Active_handles points to a block of handles
150 JNIHandleBlock* _active_handles;
151
152 // One-element thread local free list
153 JNIHandleBlock* _free_handle_block;
154
155 public:
156 volatile intptr_t _Stalled;
157
158 // For tracking the heavyweight monitor the thread is pending on.
159 ObjectMonitor* current_pending_monitor() {
160 // Use Atomic::load() to prevent data race between concurrent modification and
161 // concurrent readers, e.g. ThreadService::get_current_contended_monitor().
162 // Especially, reloading pointer from thread after NULL check must be prevented.
163 return Atomic::load(&_current_pending_monitor);
164 }
165 void set_current_pending_monitor(ObjectMonitor* monitor) {
166 Atomic::store(&_current_pending_monitor, monitor);
167 }
168 void set_current_pending_monitor_is_from_java(bool from_java) {
169 _current_pending_monitor_is_from_java = from_java;
170 }
171 bool current_pending_monitor_is_from_java() {
172 return _current_pending_monitor_is_from_java;
173 }
174 ObjectMonitor* current_waiting_monitor() {
175 // See the comment in current_pending_monitor() above.
176 return Atomic::load(&_current_waiting_monitor);
177 }
178 void set_current_waiting_monitor(ObjectMonitor* monitor) {
179 Atomic::store(&_current_waiting_monitor, monitor);
180 }
181
182 // JNI handle support
183 JNIHandleBlock* active_handles() const { return _active_handles; }
184 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
185 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
186 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
187
188 void push_jni_handle_block();
189 void pop_jni_handle_block();
190
191 private:
192 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
193 // allocated during deoptimization
194 // and by JNI_MonitorEnter/Exit
195
196 enum SuspendFlags {
197 // NOTE: avoid using the sign-bit as cc generates different test code
198 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
199 _trace_flag = 0x00000004U, // call tracing backend
200 _obj_deopt = 0x00000008U // suspend for object reallocation and relocking for JVMTI agent
201 };
202
203 // various suspension related flags - atomically updated
204 volatile uint32_t _suspend_flags;
205
206 inline void set_suspend_flag(SuspendFlags f);
207 inline void clear_suspend_flag(SuspendFlags f);
208
209 public:
210 inline void set_trace_flag();
211 inline void clear_trace_flag();
212 inline void set_obj_deopt_flag();
213 inline void clear_obj_deopt_flag();
214 bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; }
215 bool is_obj_deopt_suspend() { return (_suspend_flags & _obj_deopt) != 0; }
216
217 // Asynchronous exception support
218 private:
219 friend class InstallAsyncExceptionHandshake;
220 friend class AsyncExceptionHandshake;
221 friend class HandshakeState;
222
223 void install_async_exception(AsyncExceptionHandshake* aec = NULL);
224 void handle_async_exception(oop java_throwable);
225 public:
226 bool has_async_exception_condition(bool ThreadDeath_only = false);
227 inline void set_pending_unsafe_access_error();
228 static void send_async_exception(JavaThread* jt, oop java_throwable);
229
230 class NoAsyncExceptionDeliveryMark : public StackObj {
231 friend JavaThread;
232 JavaThread *_target;
233 inline NoAsyncExceptionDeliveryMark(JavaThread *t);
234 inline ~NoAsyncExceptionDeliveryMark();
235 };
236
237 // Safepoint support
238 public: // Expose _thread_state for SafeFetchInt()
239 volatile JavaThreadState _thread_state;
240 private:
241 SafepointMechanism::ThreadData _poll_data;
242 ThreadSafepointState* _safepoint_state; // Holds information about a thread during a safepoint
243 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
244 NOT_PRODUCT(bool _requires_cross_modify_fence;) // State used by VerifyCrossModifyFence
245 #ifdef ASSERT
246 // Debug support for checking if code allows safepoints or not.
247 // Safepoints in the VM can happen because of allocation, invoking a VM operation, or blocking on
248 // mutex, or blocking on an object synchronizer (Java locking).
249 // If _no_safepoint_count is non-zero, then an assertion failure will happen in any of
250 // the above cases. The class NoSafepointVerifier is used to set this counter.
251 int _no_safepoint_count; // If 0, thread allow a safepoint to happen
252
253 public:
254 void inc_no_safepoint_count() { _no_safepoint_count++; }
255 void dec_no_safepoint_count() { _no_safepoint_count--; }
256 #endif // ASSERT
257 public:
258 // These functions check conditions before possibly going to a safepoint.
259 // including NoSafepointVerifier.
260 void check_for_valid_safepoint_state() NOT_DEBUG_RETURN;
261 void check_possible_safepoint() NOT_DEBUG_RETURN;
262
263 #ifdef ASSERT
264 private:
265 volatile uint64_t _visited_for_critical_count;
266
267 public:
268 void set_visited_for_critical_count(uint64_t safepoint_id) {
269 assert(_visited_for_critical_count == 0, "Must be reset before set");
270 assert((safepoint_id & 0x1) == 1, "Must be odd");
271 _visited_for_critical_count = safepoint_id;
272 }
273 void reset_visited_for_critical_count(uint64_t safepoint_id) {
274 assert(_visited_for_critical_count == safepoint_id, "Was not visited");
275 _visited_for_critical_count = 0;
276 }
277 bool was_visited_for_critical_count(uint64_t safepoint_id) const {
278 return _visited_for_critical_count == safepoint_id;
279 }
280 #endif // ASSERT
281
282 // JavaThread termination support
283 public:
284 enum TerminatedTypes {
285 _not_terminated = 0xDEAD - 3,
286 _thread_exiting, // JavaThread::exit() has been called for this thread
287 _thread_gc_barrier_detached, // thread's GC barrier has been detached
288 _thread_terminated, // JavaThread is removed from thread list
289 _vm_exited // JavaThread is still executing native code, but VM is terminated
290 // only VM_Exit can set _vm_exited
291 };
292
293 private:
294 // In general a JavaThread's _terminated field transitions as follows:
295 //
296 // _not_terminated => _thread_exiting => _thread_gc_barrier_detached => _thread_terminated
297 //
298 // _vm_exited is a special value to cover the case of a JavaThread
299 // executing native code after the VM itself is terminated.
300 //
301 // A JavaThread that fails to JNI attach has these _terminated field transitions:
302 // _not_terminated => _thread_terminated
303 //
304 volatile TerminatedTypes _terminated;
305
306 jint _in_deopt_handler; // count of deoptimization
307 // handlers thread is in
308 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
309 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
310 // never locked) when throwing an exception. Used by interpreter only.
311 #if INCLUDE_JVMTI
312 volatile bool _carrier_thread_suspended; // Carrier thread is externally suspended
313 bool _is_in_VTMS_transition; // thread is in virtual thread mount state transition
314 #ifdef ASSERT
315 bool _is_VTMS_transition_disabler; // thread currently disabled VTMS transitions
316 #endif
317 #endif
318
319 // JNI attach states:
320 enum JNIAttachStates {
321 _not_attaching_via_jni = 1, // thread is not attaching via JNI
322 _attaching_via_jni, // thread is attaching via JNI
323 _attached_via_jni // thread has attached via JNI
324 };
325
326 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
327 // A native thread that is attaching via JNI starts with a value
328 // of _attaching_via_jni and transitions to _attached_via_jni.
329 volatile JNIAttachStates _jni_attach_state;
330
331
332 #if INCLUDE_JVMCI
333 // The _pending_* fields below are used to communicate extra information
334 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler.
335
336 // Communicates the DeoptReason and DeoptAction of the uncommon trap
337 int _pending_deoptimization;
338
339 // Specifies whether the uncommon trap is to bci 0 of a synchronized method
340 // before the monitor has been acquired.
341 bool _pending_monitorenter;
342
343 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter
344 bool _pending_transfer_to_interpreter;
345
346 // True if in a runtime call from compiled code that will deoptimize
347 // and re-execute a failed heap allocation in the interpreter.
348 bool _in_retryable_allocation;
349
350 // An id of a speculation that JVMCI compiled code can use to further describe and
351 // uniquely identify the speculative optimization guarded by an uncommon trap.
352 // See JVMCINMethodData::SPECULATION_LENGTH_BITS for further details.
353 jlong _pending_failed_speculation;
354
355 // These fields are mutually exclusive in terms of live ranges.
356 union {
357 // Communicates the pc at which the most recent implicit exception occurred
358 // from the signal handler to a deoptimization stub.
359 address _implicit_exception_pc;
360
361 // Communicates an alternative call target to an i2c stub from a JavaCall .
362 address _alternate_call_target;
363 } _jvmci;
364
365 // The JVMCIRuntime in a JVMCI shared library
366 JVMCIRuntime* _libjvmci_runtime;
367
368 // Support for high precision, thread sensitive counters in JVMCI compiled code.
369 jlong* _jvmci_counters;
370
371 // Fast thread locals for use by JVMCI
372 jlong _jvmci_reserved0;
373 jlong _jvmci_reserved1;
374 oop _jvmci_reserved_oop0;
375
376 public:
377 static jlong* _jvmci_old_thread_counters;
378 static void collect_counters(jlong* array, int length);
379
380 bool resize_counters(int current_size, int new_size);
381
382 static bool resize_all_jvmci_counters(int new_size);
383
384 void set_jvmci_reserved_oop0(oop value) {
385 _jvmci_reserved_oop0 = value;
386 }
387
388 oop get_jvmci_reserved_oop0() {
389 return _jvmci_reserved_oop0;
390 }
391
392 void set_jvmci_reserved0(jlong value) {
393 _jvmci_reserved0 = value;
394 }
395
396 jlong get_jvmci_reserved0() {
397 return _jvmci_reserved0;
398 }
399
400 void set_jvmci_reserved1(jlong value) {
401 _jvmci_reserved1 = value;
402 }
403
404 jlong get_jvmci_reserved1() {
405 return _jvmci_reserved1;
406 }
407
408 private:
409 #endif // INCLUDE_JVMCI
410
411 StackOverflow _stack_overflow_state;
412
413 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
414 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
415 // code)
416 volatile oop _exception_oop; // Exception thrown in compiled code
417 volatile address _exception_pc; // PC where exception happened
418 volatile address _exception_handler_pc; // PC for handler of exception
419 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
420
421 private:
422 // support for JNI critical regions
423 jint _jni_active_critical; // count of entries into JNI critical region
424
425 // Checked JNI: function name requires exception check
426 char* _pending_jni_exception_check_fn;
427
428 // For deadlock detection.
429 int _depth_first_number;
430
431 // JVMTI PopFrame support
432 // This is set to popframe_pending to signal that top Java frame should be popped immediately
433 int _popframe_condition;
434
435 // If reallocation of scalar replaced objects fails, we throw OOM
436 // and during exception propagation, pop the top
437 // _frames_to_pop_failed_realloc frames, the ones that reference
438 // failed reallocations.
439 int _frames_to_pop_failed_realloc;
440
441 ContinuationEntry* _cont_entry;
442 intptr_t* _cont_fastpath; // the sp of the oldest known interpreted/call_stub frame inside the
443 // continuation that we know about
444 int _cont_fastpath_thread_state; // whether global thread state allows continuation fastpath (JVMTI)
445 // It's signed for error detection.
446 #ifdef _LP64
447 int64_t _held_monitor_count; // used by continuations for fast lock detection
448 int64_t _jni_monitor_count;
449 #else
450 int32_t _held_monitor_count; // used by continuations for fast lock detection
451 int32_t _jni_monitor_count;
452 #endif
453
454 private:
455
456 friend class VMThread;
457 friend class ThreadWaitTransition;
458 friend class VM_Exit;
459
460 // Stack watermark barriers.
461 StackWatermarks _stack_watermarks;
462
463 public:
464 inline StackWatermarks* stack_watermarks() { return &_stack_watermarks; }
465
466 public:
467 jlong _extentLocal_hash_table_shift;
468
469 void allocate_extentLocal_hash_table(int count);
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 extentLocalCache() const;
524 void set_extentLocalCache(oop p);
525 oop jvmti_vthread() const;
526 void set_jvmti_vthread(oop p);
527
528 // Prepare thread and add to priority queue. If a priority is
529 // not specified, use the priority of the thread object. Threads_lock
530 // must be held while this function is called.
531 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
532
533 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
534 address saved_exception_pc() { return _saved_exception_pc; }
535
536 ThreadFunction entry_point() const { return _entry_point; }
537
538 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
539 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS);
540
541 // Last frame anchor routines
542
543 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
544
545 // last_Java_sp
546 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
547 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
548
549 // last_Java_pc
550
551 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
552
553 // Safepoint support
554 inline JavaThreadState thread_state() const;
555 inline void set_thread_state(JavaThreadState s);
556 inline void set_thread_state_fence(JavaThreadState s); // fence after setting thread state
557 inline ThreadSafepointState* safepoint_state() const;
558 inline void set_safepoint_state(ThreadSafepointState* state);
559 inline bool is_at_poll_safepoint();
560
561 // JavaThread termination and lifecycle support:
562 void smr_delete();
563 bool on_thread_list() const { return _on_thread_list; }
564 void set_on_thread_list() { _on_thread_list = true; }
565
566 // thread has called JavaThread::exit(), thread's GC barrier is detached
567 // or thread is terminated
568 bool is_exiting() const;
569 // thread's GC barrier is NOT detached and thread is NOT terminated
570 bool is_oop_safe() const;
571 // thread is terminated (no longer on the threads list); the thread must
572 // be protected by a ThreadsListHandle to avoid potential crashes.
573 bool check_is_terminated(TerminatedTypes l_terminated) const {
574 return l_terminated == _thread_terminated || l_terminated == _vm_exited;
575 }
576 bool is_terminated() const;
577 void set_terminated(TerminatedTypes t);
578
579 void block_if_vm_exited();
580
581 bool doing_unsafe_access() { return _doing_unsafe_access; }
582 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
583
584 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
585 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
586
587 SafepointMechanism::ThreadData* poll_data() { return &_poll_data; }
588
589 void set_requires_cross_modify_fence(bool val) PRODUCT_RETURN NOT_PRODUCT({ _requires_cross_modify_fence = val; })
590
591 // Continuation support
592 oop get_continuation() const;
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 == NULL && _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 void set_is_in_VTMS_transition(bool val);
648 #ifdef ASSERT
649 bool is_VTMS_transition_disabler() const { return _is_VTMS_transition_disabler; }
650 void set_is_VTMS_transition_disabler(bool val);
651 #endif
652 #endif
653
654 // Support for object deoptimization and JFR suspension
655 void handle_special_runtime_exit_condition();
656 bool has_special_runtime_exit_condition() {
657 return (_suspend_flags & (_obj_deopt JFR_ONLY(| _trace_flag))) != 0;
658 }
659
660 // Fast-locking support
661 bool is_lock_owned(address adr) const;
662 bool is_lock_owned_current(address adr) const; // virtual if mounted, otherwise whole thread
663 bool is_lock_owned_carrier(address adr) const;
664
665 // Accessors for vframe array top
666 // The linked list of vframe arrays are sorted on sp. This means when we
667 // unpack the head must contain the vframe array to unpack.
668 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
669 vframeArray* vframe_array_head() const { return _vframe_array_head; }
670
671 // Side structure for deferring update of java frame locals until deopt occurs
672 JvmtiDeferredUpdates* deferred_updates() const { return _jvmti_deferred_updates; }
673 void set_deferred_updates(JvmtiDeferredUpdates* du) { _jvmti_deferred_updates = du; }
674
675 // These only really exist to make debugging deopt problems simpler
676
677 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
678 vframeArray* vframe_array_last() const { return _vframe_array_last; }
679
680 // The special resourceMark used during deoptimization
681
682 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
683 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
684
685 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; }
686 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; }
687
688 Method* callee_target() const { return _callee_target; }
689 void set_callee_target (Method* x) { _callee_target = x; }
690
691 // Oop results of vm runtime calls
692 oop vm_result() const { return _vm_result; }
693 void set_vm_result (oop x) { _vm_result = x; }
694
695 Metadata* vm_result_2() const { return _vm_result_2; }
696 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
697
698 oop return_buffered_value() const { return _return_buffered_value; }
699 void set_return_buffered_value(oop val) { _return_buffered_value = val; }
700
701 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
702 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
703
704 #if INCLUDE_JVMCI
705 int pending_deoptimization() const { return _pending_deoptimization; }
706 jlong pending_failed_speculation() const { return _pending_failed_speculation; }
707 bool has_pending_monitorenter() const { return _pending_monitorenter; }
708 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; }
709 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; }
710 void set_pending_failed_speculation(jlong failed_speculation) { _pending_failed_speculation = failed_speculation; }
711 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; }
712 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; }
713 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; }
714
715 virtual bool in_retryable_allocation() const { return _in_retryable_allocation; }
716 void set_in_retryable_allocation(bool b) { _in_retryable_allocation = b; }
717
718 JVMCIRuntime* libjvmci_runtime() const { return _libjvmci_runtime; }
719 void set_libjvmci_runtime(JVMCIRuntime* rt) {
720 assert((_libjvmci_runtime == nullptr && rt != nullptr) || (_libjvmci_runtime != nullptr && rt == nullptr), "must be");
721 _libjvmci_runtime = rt;
722 }
723 #endif // INCLUDE_JVMCI
724
725 // Exception handling for compiled methods
726 oop exception_oop() const;
727 address exception_pc() const { return _exception_pc; }
728 address exception_handler_pc() const { return _exception_handler_pc; }
729 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
730
731 void set_exception_oop(oop o);
732 void set_exception_pc(address a) { _exception_pc = a; }
733 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
734 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
735
736 void clear_exception_oop_and_pc() {
737 set_exception_oop(NULL);
738 set_exception_pc(NULL);
739 }
740
741 // Check if address is in the usable part of the stack (excludes protected
742 // guard pages). Can be applied to any thread and is an approximation for
743 // using is_in_live_stack when the query has to happen from another thread.
744 bool is_in_usable_stack(address adr) const {
745 return is_in_stack_range_incl(adr, _stack_overflow_state.stack_reserved_zone_base());
746 }
747
748 // Misc. accessors/mutators
749 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
750 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
751 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
752
753 static ByteSize extentLocalCache_offset() { return byte_offset_of(JavaThread, _extentLocalCache); }
754
755 // For assembly stub generation
756 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
757 static ByteSize vthread_offset() { return byte_offset_of(JavaThread, _vthread); }
758 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
759 static ByteSize pending_jni_exception_check_fn_offset() {
760 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn);
761 }
762 static ByteSize last_Java_sp_offset() {
763 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
764 }
765 static ByteSize last_Java_pc_offset() {
766 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
767 }
768 static ByteSize frame_anchor_offset() {
769 return byte_offset_of(JavaThread, _anchor);
770 }
771 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
772 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
773 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
774 static ByteSize return_buffered_value_offset() { return byte_offset_of(JavaThread, _return_buffered_value); }
775 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
776 static ByteSize polling_word_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_word);}
777 static ByteSize polling_page_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_page);}
778 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
779 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
780 #if INCLUDE_JVMCI
781 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); }
782 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); }
783 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); }
784 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); }
785 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); }
786 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); }
787 #endif // INCLUDE_JVMCI
788 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
789 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
790 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
791 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
792
793 static ByteSize active_handles_offset() { return byte_offset_of(JavaThread, _active_handles); }
794
795 // StackOverflow offsets
796 static ByteSize stack_overflow_limit_offset() {
797 return byte_offset_of(JavaThread, _stack_overflow_state._stack_overflow_limit);
798 }
799 static ByteSize stack_guard_state_offset() {
800 return byte_offset_of(JavaThread, _stack_overflow_state._stack_guard_state);
801 }
802 static ByteSize reserved_stack_activation_offset() {
803 return byte_offset_of(JavaThread, _stack_overflow_state._reserved_stack_activation);
804 }
805 static ByteSize shadow_zone_safe_limit() {
806 return byte_offset_of(JavaThread, _stack_overflow_state._shadow_zone_safe_limit);
807 }
808 static ByteSize shadow_zone_growth_watermark() {
809 return byte_offset_of(JavaThread, _stack_overflow_state._shadow_zone_growth_watermark);
810 }
811
812 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
813
814 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
815 static ByteSize should_post_on_exceptions_flag_offset() {
816 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
817 }
818 static ByteSize doing_unsafe_access_offset() { return byte_offset_of(JavaThread, _doing_unsafe_access); }
819 NOT_PRODUCT(static ByteSize requires_cross_modify_fence_offset() { return byte_offset_of(JavaThread, _requires_cross_modify_fence); })
820
821 static ByteSize cont_entry_offset() { return byte_offset_of(JavaThread, _cont_entry); }
822 static ByteSize cont_fastpath_offset() { return byte_offset_of(JavaThread, _cont_fastpath); }
823 static ByteSize held_monitor_count_offset() { return byte_offset_of(JavaThread, _held_monitor_count); }
824
825 // Returns the jni environment for this thread
826 JNIEnv* jni_environment() { return &_jni_environment; }
827
828 // Returns the current thread as indicated by the given JNIEnv.
829 // We don't assert it is Thread::current here as that is done at the
830 // external JNI entry points where the JNIEnv is passed into the VM.
831 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
832 JavaThread* current = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
833 // We can't normally get here in a thread that has completed its
834 // execution and so "is_terminated", except when the call is from
835 // AsyncGetCallTrace, which can be triggered by a signal at any point in
836 // a thread's lifecycle. A thread is also considered terminated if the VM
837 // has exited, so we have to check this and block in case this is a daemon
838 // thread returning to the VM (the JNI DirectBuffer entry points rely on
839 // this).
840 if (current->is_terminated()) {
841 current->block_if_vm_exited();
842 }
843 return current;
844 }
845
846 // JNI critical regions. These can nest.
847 bool in_critical() { return _jni_active_critical > 0; }
848 bool in_last_critical() { return _jni_active_critical == 1; }
849 inline void enter_critical();
850 void exit_critical() {
851 assert(Thread::current() == this, "this must be current thread");
852 _jni_active_critical--;
853 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
854 }
855
856 // Checked JNI: is the programmer required to check for exceptions, if so specify
857 // which function name. Returning to a Java frame should implicitly clear the
858 // pending check, this is done for Native->Java transitions (i.e. user JNI code).
859 // VM->Java transitions are not cleared, it is expected that JNI code enclosed
860 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal).
861 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
862 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
863 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
864 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
865
866 // For deadlock detection
867 int depth_first_number() { return _depth_first_number; }
868 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
869
870 private:
871 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
872
873 public:
874 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
875 void add_monitor_chunk(MonitorChunk* chunk);
876 void remove_monitor_chunk(MonitorChunk* chunk);
877 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
878 void inc_in_deopt_handler() { _in_deopt_handler++; }
879 void dec_in_deopt_handler() {
880 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
881 if (_in_deopt_handler > 0) { // robustness
882 _in_deopt_handler--;
883 }
884 }
885
886 private:
887 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
888
889 // factor out low-level mechanics for use in both normal and error cases
890 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
891
892 public:
893
894 // Frame iteration; calls the function f for all frames on the stack
895 void frames_do(void f(frame*, const RegisterMap*));
896
897 // Memory operations
898 void oops_do_frames(OopClosure* f, CodeBlobClosure* cf);
899 void oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf);
900
901 // GC operations
902 virtual void nmethods_do(CodeBlobClosure* cf);
903
904 // RedefineClasses Support
905 void metadata_do(MetadataClosure* f);
906
907 // Debug method asserting thread states are correct during a handshake operation.
908 DEBUG_ONLY(void verify_states_for_handshake();)
909
910 // Misc. operations
911 const char* name() const;
912 const char* type_name() const { return "JavaThread"; }
913 static const char* name_for(oop thread_obj);
914
915 void print_on(outputStream* st, bool print_extended_info) const;
916 void print_on(outputStream* st) const { print_on(st, false); }
917 void print() const;
918 void print_thread_state_on(outputStream*) const;
919 const char* thread_state_name() const;
920 void print_on_error(outputStream* st, char* buf, int buflen) const;
921 void print_name_on_error(outputStream* st, char* buf, int buflen) const;
922 void verify();
923
924 // Accessing frames
925 frame last_frame() {
926 _anchor.make_walkable();
927 return pd_last_frame();
928 }
929 javaVFrame* last_java_vframe(RegisterMap* reg_map) { return last_java_vframe(last_frame(), reg_map); }
930
931 frame carrier_last_frame(RegisterMap* reg_map);
932 javaVFrame* carrier_last_java_vframe(RegisterMap* reg_map) { return last_java_vframe(carrier_last_frame(reg_map), reg_map); }
933
934 frame vthread_last_frame();
935 javaVFrame* vthread_last_java_vframe(RegisterMap* reg_map) { return last_java_vframe(vthread_last_frame(), reg_map); }
936
937 frame platform_thread_last_frame(RegisterMap* reg_map);
938 javaVFrame* platform_thread_last_java_vframe(RegisterMap* reg_map) {
939 return last_java_vframe(platform_thread_last_frame(reg_map), reg_map);
940 }
941
942 javaVFrame* last_java_vframe(const frame f, RegisterMap* reg_map);
943
944 // Returns method at 'depth' java or native frames down the stack
945 // Used for security checks
946 Klass* security_get_caller_class(int depth);
947
948 // Print stack trace in external format
949 void print_stack_on(outputStream* st);
950 void print_stack() { print_stack_on(tty); }
951
952 // Print stack traces in various internal formats
953 void trace_stack() PRODUCT_RETURN;
954 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
955 void trace_frames() PRODUCT_RETURN;
956
957 // Print an annotated view of the stack frames
958 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
959 void validate_frame_layout() {
960 print_frame_layout(0, true);
961 }
962
963 // Function for testing deoptimization
964 void deoptimize();
965 void make_zombies();
966
967 void deoptimize_marked_methods();
968
969 public:
970 // Returns the running thread as a JavaThread
971 static JavaThread* current() {
972 return JavaThread::cast(Thread::current());
973 }
974
975 // Returns the current thread as a JavaThread, or NULL if not attached
976 static inline JavaThread* current_or_null();
977
978 // Casts
979 static JavaThread* cast(Thread* t) {
980 assert(t->is_Java_thread(), "incorrect cast to JavaThread");
981 return static_cast<JavaThread*>(t);
982 }
983
984 static const JavaThread* cast(const Thread* t) {
985 assert(t->is_Java_thread(), "incorrect cast to const JavaThread");
986 return static_cast<const JavaThread*>(t);
987 }
988
989 // Returns the active Java thread. Do not use this if you know you are calling
990 // from a JavaThread, as it's slower than JavaThread::current. If called from
991 // the VMThread, it also returns the JavaThread that instigated the VMThread's
992 // operation. You may not want that either.
993 static JavaThread* active();
994
995 protected:
996 virtual void pre_run();
997 virtual void run();
998 void thread_main_inner();
999 virtual void post_run();
1000
1001 public:
1002 // Thread local information maintained by JVMTI.
1003 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1004 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1005 // getter is used to get this JavaThread's JvmtiThreadState if it has
1006 // one which means NULL can be returned. JvmtiThreadState::state_for()
1007 // is used to get the specified JavaThread's JvmtiThreadState if it has
1008 // one or it allocates a new JvmtiThreadState for the JavaThread and
1009 // returns it. JvmtiThreadState::state_for() will return NULL only if
1010 // the specified JavaThread is exiting.
1011 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1012 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1013
1014 #if INCLUDE_JVMTI
1015 // Rebind JVMTI thread state from carrier to virtual or from virtual to carrier.
1016 JvmtiThreadState *rebind_to_jvmti_thread_state_of(oop thread_oop);
1017 #endif
1018
1019 // JVMTI PopFrame support
1020 // Setting and clearing popframe_condition
1021 // All of these enumerated values are bits. popframe_pending
1022 // indicates that a PopFrame() has been requested and not yet been
1023 // completed. popframe_processing indicates that that PopFrame() is in
1024 // the process of being completed. popframe_force_deopt_reexecution_bit
1025 // indicates that special handling is required when returning to a
1026 // deoptimized caller.
1027 enum PopCondition {
1028 popframe_inactive = 0x00,
1029 popframe_pending_bit = 0x01,
1030 popframe_processing_bit = 0x02,
1031 popframe_force_deopt_reexecution_bit = 0x04
1032 };
1033 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1034 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1035 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1036 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1037 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1038 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1039 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1040 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1041
1042 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1043 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1044 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1045
1046 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1047 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1048 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1049
1050 private:
1051 // Saved incoming arguments to popped frame.
1052 // Used only when popped interpreted frame returns to deoptimized frame.
1053 void* _popframe_preserved_args;
1054 int _popframe_preserved_args_size;
1055
1056 public:
1057 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1058 void* popframe_preserved_args();
1059 ByteSize popframe_preserved_args_size();
1060 WordSize popframe_preserved_args_size_in_words();
1061 void popframe_free_preserved_args();
1062
1063
1064 private:
1065 JvmtiThreadState *_jvmti_thread_state;
1066
1067 // Used by the interpreter in fullspeed mode for frame pop, method
1068 // entry, method exit and single stepping support. This field is
1069 // only set to non-zero at a safepoint or using a direct handshake
1070 // (see EnterInterpOnlyModeClosure).
1071 // It can be set to zero asynchronously to this threads execution (i.e., without
1072 // safepoint/handshake or a lock) so we have to be very careful.
1073 // Accesses by other threads are synchronized using JvmtiThreadState_lock though.
1074 int _interp_only_mode;
1075
1076 public:
1077 // used by the interpreter for fullspeed debugging support (see above)
1078 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1079 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1080 int get_interp_only_mode() { return _interp_only_mode; }
1081 int set_interp_only_mode(int val) { return _interp_only_mode = val; }
1082 void increment_interp_only_mode() { ++_interp_only_mode; }
1083 void decrement_interp_only_mode() { --_interp_only_mode; }
1084
1085 // support for cached flag that indicates whether exceptions need to be posted for this thread
1086 // if this is false, we can avoid deoptimizing when events are thrown
1087 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1088 private:
1089 int _should_post_on_exceptions_flag;
1090
1091 public:
1092 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1093 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1094
1095 private:
1096 ThreadStatistics *_thread_stat;
1097
1098 public:
1099 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1100
1101 // Return a blocker object for which this thread is blocked parking.
1102 oop current_park_blocker();
1103
1104 private:
1105 static size_t _stack_size_at_create;
1106
1107 public:
1108 static inline size_t stack_size_at_create(void) {
1109 return _stack_size_at_create;
1110 }
1111 static inline void set_stack_size_at_create(size_t value) {
1112 _stack_size_at_create = value;
1113 }
1114
1115 // Machine dependent stuff
1116 #include OS_CPU_HEADER(javaThread)
1117
1118 // JSR166 per-thread parker
1119 private:
1120 Parker _parker;
1121 public:
1122 Parker* parker() { return &_parker; }
1123
1124 public:
1125 // clearing/querying jni attach status
1126 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1127 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1128 inline void set_done_attaching_via_jni();
1129
1130 // Stack dump assistance:
1131 // Track the class we want to initialize but for which we have to wait
1132 // on its init_lock() because it is already being initialized.
1133 void set_class_to_be_initialized(InstanceKlass* k);
1134 InstanceKlass* class_to_be_initialized() const;
1135
1136 private:
1137 InstanceKlass* _class_to_be_initialized;
1138
1139 // java.lang.Thread.sleep support
1140 ParkEvent * _SleepEvent;
1141 public:
1142 bool sleep(jlong millis);
1143
1144 // java.lang.Thread interruption support
1145 void interrupt();
1146 bool is_interrupted(bool clear_interrupted);
1147
1148 static OopStorage* thread_oop_storage();
1149
1150 static void verify_cross_modify_fence_failure(JavaThread *thread) PRODUCT_RETURN;
1151
1152 // Helper function to create the java.lang.Thread object for a
1153 // VM-internal thread. The thread will have the given name, be
1154 // part of the System ThreadGroup and if is_visible is true will be
1155 // discoverable via the system ThreadGroup.
1156 static Handle create_system_thread_object(const char* name, bool is_visible, TRAPS);
1157
1158 // Helper function to start a VM-internal daemon thread.
1159 // E.g. ServiceThread, NotificationThread, CompilerThread etc.
1160 static void start_internal_daemon(JavaThread* current, JavaThread* target,
1161 Handle thread_oop, ThreadPriority prio);
1162
1163 // Helper function to do vm_exit_on_initialization for osthread
1164 // resource allocation failure.
1165 static void vm_exit_on_osthread_failure(JavaThread* thread);
1166
1167 // AsyncGetCallTrace support
1168 inline bool in_asgct(void) {return _in_asgct;}
1169 inline void set_in_asgct(bool value) {_in_asgct = value;}
1170 };
1171
1172 inline JavaThread* JavaThread::current_or_null() {
1173 Thread* current = Thread::current_or_null();
1174 return current != nullptr ? JavaThread::cast(current) : nullptr;
1175 }
1176
1177 class UnlockFlagSaver {
1178 private:
1179 JavaThread* _thread;
1180 bool _do_not_unlock;
1181 public:
1182 UnlockFlagSaver(JavaThread* t) {
1183 _thread = t;
1184 _do_not_unlock = t->do_not_unlock_if_synchronized();
1185 t->set_do_not_unlock_if_synchronized(false);
1186 }
1187 ~UnlockFlagSaver() {
1188 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
1189 }
1190 };
1191
1192 class JNIHandleMark : public StackObj {
1193 JavaThread* _thread;
1194 public:
1195 JNIHandleMark(JavaThread* thread) : _thread(thread) {
1196 thread->push_jni_handle_block();
1197 }
1198 ~JNIHandleMark() { _thread->pop_jni_handle_block(); }
1199 };
1200
1201 #endif // SHARE_RUNTIME_JAVATHREAD_HPP