1 /*
2 * Copyright (c) 1997, 2021, 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_THREAD_HPP
27 #define SHARE_RUNTIME_THREAD_HPP
28
29 #include "jni.h"
30 #include "gc/shared/gcThreadLocalData.hpp"
31 #include "gc/shared/threadLocalAllocBuffer.hpp"
32 #include "memory/allocation.hpp"
33 #include "oops/oop.hpp"
34 #include "oops/oopHandle.hpp"
35 #include "runtime/frame.hpp"
36 #include "runtime/globals.hpp"
37 #include "runtime/handshake.hpp"
38 #include "runtime/javaFrameAnchor.hpp"
39 #include "runtime/mutexLocker.hpp"
40 #include "runtime/os.hpp"
41 #include "runtime/park.hpp"
42 #include "runtime/safepointMechanism.hpp"
43 #include "runtime/stackWatermarkSet.hpp"
44 #include "runtime/stackOverflow.hpp"
45 #include "runtime/threadHeapSampler.hpp"
46 #include "runtime/threadLocalStorage.hpp"
47 #include "runtime/threadStatisticalInfo.hpp"
48 #include "runtime/unhandledOops.hpp"
49 #include "utilities/align.hpp"
50 #include "utilities/exceptions.hpp"
51 #include "utilities/globalDefinitions.hpp"
52 #include "utilities/macros.hpp"
53 #if INCLUDE_JFR
54 #include "jfr/support/jfrThreadExtension.hpp"
55 #endif
56
57 class SafeThreadsListPtr;
58 class ThreadSafepointState;
59 class ThreadsList;
60 class ThreadsSMRSupport;
61
62 class JNIHandleBlock;
63 class JvmtiRawMonitor;
64 class JvmtiSampledObjectAllocEventCollector;
65 class JvmtiThreadState;
66 class JvmtiVMObjectAllocEventCollector;
67 class OSThread;
68 class ThreadStatistics;
69 class ConcurrentLocksDump;
70 class MonitorInfo;
71
72 class vframeArray;
73 class vframe;
74 class javaVFrame;
75
76 class DeoptResourceMark;
77 class JvmtiDeferredUpdates;
78
79 class ThreadClosure;
80 class ICRefillVerifier;
81
82 class Metadata;
83 class ResourceArea;
84
85 class OopStorage;
86
87 DEBUG_ONLY(class ResourceMark;)
88
89 class WorkerThread;
90
91 class JavaThread;
92
93 // Class hierarchy
94 // - Thread
95 // - JavaThread
96 // - various subclasses eg CompilerThread, ServiceThread
97 // - NonJavaThread
98 // - NamedThread
99 // - VMThread
100 // - ConcurrentGCThread
101 // - WorkerThread
102 // - GangWorker
103 // - WatcherThread
104 // - JfrThreadSampler
105 // - LogAsyncWriter
106 //
107 // All Thread subclasses must be either JavaThread or NonJavaThread.
108 // This means !t->is_Java_thread() iff t is a NonJavaThread, or t is
109 // a partially constructed/destroyed Thread.
110
111 // Thread execution sequence and actions:
112 // All threads:
113 // - thread_native_entry // per-OS native entry point
114 // - stack initialization
115 // - other OS-level initialization (signal masks etc)
116 // - handshake with creating thread (if not started suspended)
117 // - this->call_run() // common shared entry point
118 // - shared common initialization
119 // - this->pre_run() // virtual per-thread-type initialization
120 // - this->run() // virtual per-thread-type "main" logic
121 // - shared common tear-down
122 // - this->post_run() // virtual per-thread-type tear-down
123 // - // 'this' no longer referenceable
124 // - OS-level tear-down (minimal)
125 // - final logging
126 //
127 // For JavaThread:
128 // - this->run() // virtual but not normally overridden
129 // - this->thread_main_inner() // extra call level to ensure correct stack calculations
130 // - this->entry_point() // set differently for each kind of JavaThread
131
132 class Thread: public ThreadShadow {
133 friend class VMStructs;
134 friend class JVMCIVMStructs;
135 private:
136
137 #ifndef USE_LIBRARY_BASED_TLS_ONLY
138 // Current thread is maintained as a thread-local variable
139 static THREAD_LOCAL Thread* _thr_current;
140 #endif
141
142 // Thread local data area available to the GC. The internal
143 // structure and contents of this data area is GC-specific.
144 // Only GC and GC barrier code should access this data area.
145 GCThreadLocalData _gc_data;
146
147 public:
148 static ByteSize gc_data_offset() {
149 return byte_offset_of(Thread, _gc_data);
150 }
151
152 template <typename T> T* gc_data() {
153 STATIC_ASSERT(sizeof(T) <= sizeof(_gc_data));
154 return reinterpret_cast<T*>(&_gc_data);
155 }
156
157 // Exception handling
158 // (Note: _pending_exception and friends are in ThreadShadow)
159 //oop _pending_exception; // pending exception for current thread
160 // const char* _exception_file; // file information for exception (debugging only)
161 // int _exception_line; // line information for exception (debugging only)
162 protected:
163
164 DEBUG_ONLY(static Thread* _starting_thread;)
165
166 // Support for forcing alignment of thread objects for biased locking
167 void* _real_malloc_address;
168
169 // JavaThread lifecycle support:
170 friend class SafeThreadsListPtr; // for _threads_list_ptr, cmpxchg_threads_hazard_ptr(), {dec_,inc_,}nested_threads_hazard_ptr_cnt(), {g,s}et_threads_hazard_ptr(), inc_nested_handle_cnt(), tag_hazard_ptr() access
171 friend class ScanHazardPtrGatherProtectedThreadsClosure; // for cmpxchg_threads_hazard_ptr(), get_threads_hazard_ptr(), is_hazard_ptr_tagged() access
172 friend class ScanHazardPtrGatherThreadsListClosure; // for get_threads_hazard_ptr(), untag_hazard_ptr() access
173 friend class ScanHazardPtrPrintMatchingThreadsClosure; // for get_threads_hazard_ptr(), is_hazard_ptr_tagged() access
174 friend class ThreadsSMRSupport; // for _nested_threads_hazard_ptr_cnt, _threads_hazard_ptr, _threads_list_ptr access
175 friend class ThreadsListHandleTest; // for _nested_threads_hazard_ptr_cnt, _threads_hazard_ptr, _threads_list_ptr access
176 friend class ValidateHazardPtrsClosure; // for get_threads_hazard_ptr(), untag_hazard_ptr() access
177
178 ThreadsList* volatile _threads_hazard_ptr;
179 SafeThreadsListPtr* _threads_list_ptr;
180 ThreadsList* cmpxchg_threads_hazard_ptr(ThreadsList* exchange_value, ThreadsList* compare_value);
181 ThreadsList* get_threads_hazard_ptr() const;
182 void set_threads_hazard_ptr(ThreadsList* new_list);
183 static bool is_hazard_ptr_tagged(ThreadsList* list) {
184 return (intptr_t(list) & intptr_t(1)) == intptr_t(1);
185 }
186 static ThreadsList* tag_hazard_ptr(ThreadsList* list) {
187 return (ThreadsList*)(intptr_t(list) | intptr_t(1));
188 }
189 static ThreadsList* untag_hazard_ptr(ThreadsList* list) {
190 return (ThreadsList*)(intptr_t(list) & ~intptr_t(1));
191 }
192 // This field is enabled via -XX:+EnableThreadSMRStatistics:
193 uint _nested_threads_hazard_ptr_cnt;
194 void dec_nested_threads_hazard_ptr_cnt() {
195 assert(_nested_threads_hazard_ptr_cnt != 0, "mismatched {dec,inc}_nested_threads_hazard_ptr_cnt()");
196 _nested_threads_hazard_ptr_cnt--;
197 }
198 void inc_nested_threads_hazard_ptr_cnt() {
199 _nested_threads_hazard_ptr_cnt++;
200 }
201 uint nested_threads_hazard_ptr_cnt() {
202 return _nested_threads_hazard_ptr_cnt;
203 }
204
205 public:
206 // Is the target JavaThread protected by the calling Thread
207 // or by some other mechanism:
208 static bool is_JavaThread_protected(const JavaThread* p);
209
210 void* operator new(size_t size) throw() { return allocate(size, true); }
211 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
212 return allocate(size, false); }
213 void operator delete(void* p);
214
215 protected:
216 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
217
218 private:
219 DEBUG_ONLY(bool _suspendible_thread;)
220
221 public:
222 // Determines if a heap allocation failure will be retried
223 // (e.g., by deoptimizing and re-executing in the interpreter).
224 // In this case, the failed allocation must raise
225 // Universe::out_of_memory_error_retry() and omit side effects
226 // such as JVMTI events and handling -XX:+HeapDumpOnOutOfMemoryError
227 // and -XX:OnOutOfMemoryError.
228 virtual bool in_retryable_allocation() const { return false; }
229
230 #ifdef ASSERT
231 void set_suspendible_thread() {
232 _suspendible_thread = true;
233 }
234
235 void clear_suspendible_thread() {
236 _suspendible_thread = false;
237 }
238
239 bool is_suspendible_thread() { return _suspendible_thread; }
240 #endif
241
242 private:
243 // Active_handles points to a block of handles
244 JNIHandleBlock* _active_handles;
245
246 // One-element thread local free list
247 JNIHandleBlock* _free_handle_block;
248
249 // Point to the last handle mark
250 HandleMark* _last_handle_mark;
251
252 // Claim value for parallel iteration over threads.
253 uintx _threads_do_token;
254
255 // Support for GlobalCounter
256 private:
257 volatile uintx _rcu_counter;
258 public:
259 volatile uintx* get_rcu_counter() {
260 return &_rcu_counter;
261 }
262
263 public:
264 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
265 HandleMark* last_handle_mark() const { return _last_handle_mark; }
266 private:
267
268 #ifdef ASSERT
269 ICRefillVerifier* _missed_ic_stub_refill_verifier;
270
271 public:
272 ICRefillVerifier* missed_ic_stub_refill_verifier() {
273 return _missed_ic_stub_refill_verifier;
274 }
275
276 void set_missed_ic_stub_refill_verifier(ICRefillVerifier* verifier) {
277 _missed_ic_stub_refill_verifier = verifier;
278 }
279 #endif // ASSERT
280
281 private:
282 // Used by SkipGCALot class.
283 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
284
285 friend class GCLocker;
286
287 private:
288 ThreadLocalAllocBuffer _tlab; // Thread-local eden
289 jlong _allocated_bytes; // Cumulative number of bytes allocated on
290 // the Java heap
291 ThreadHeapSampler _heap_sampler; // For use when sampling the memory.
292
293 ThreadStatisticalInfo _statistical_info; // Statistics about the thread
294
295 JFR_ONLY(DEFINE_THREAD_LOCAL_FIELD_JFR;) // Thread-local data for jfr
296
297 JvmtiRawMonitor* _current_pending_raw_monitor; // JvmtiRawMonitor this thread
298 // is waiting to lock
299 public:
300 // Constructor
301 Thread();
302 virtual ~Thread() = 0; // Thread is abstract.
303
304 // Manage Thread::current()
305 void initialize_thread_current();
306 static void clear_thread_current(); // TLS cleanup needed before threads terminate
307
308 protected:
309 // To be implemented by children.
310 virtual void run() = 0;
311 virtual void pre_run() = 0;
312 virtual void post_run() = 0; // Note: Thread must not be deleted prior to calling this!
313
314 #ifdef ASSERT
315 enum RunState {
316 PRE_CALL_RUN,
317 CALL_RUN,
318 PRE_RUN,
319 RUN,
320 POST_RUN
321 // POST_CALL_RUN - can't define this one as 'this' may be deleted when we want to set it
322 };
323 RunState _run_state; // for lifecycle checks
324 #endif
325
326
327 public:
328 // invokes <ChildThreadClass>::run(), with common preparations and cleanups.
329 void call_run();
330
331 // Testers
332 virtual bool is_VM_thread() const { return false; }
333 virtual bool is_Java_thread() const { return false; }
334 virtual bool is_Compiler_thread() const { return false; }
335 virtual bool is_Code_cache_sweeper_thread() const { return false; }
336 virtual bool is_service_thread() const { return false; }
337 virtual bool is_monitor_deflation_thread() const { return false; }
338 virtual bool is_hidden_from_external_view() const { return false; }
339 virtual bool is_jvmti_agent_thread() const { return false; }
340 // True iff the thread can perform GC operations at a safepoint.
341 // Generally will be true only of VM thread and parallel GC WorkGang
342 // threads.
343 virtual bool is_GC_task_thread() const { return false; }
344 virtual bool is_Watcher_thread() const { return false; }
345 virtual bool is_ConcurrentGC_thread() const { return false; }
346 virtual bool is_Named_thread() const { return false; }
347 virtual bool is_Worker_thread() const { return false; }
348 virtual bool is_JfrSampler_thread() const { return false; }
349
350 // Can this thread make Java upcalls
351 virtual bool can_call_java() const { return false; }
352
353 // Is this a JavaThread that is on the VM's current ThreadsList?
354 // If so it must participate in the safepoint protocol.
355 virtual bool is_active_Java_thread() const { return false; }
356
357 // Casts
358 inline JavaThread* as_Java_thread();
359 inline const JavaThread* as_Java_thread() const;
360
361 virtual char* name() const { return (char*)"Unknown thread"; }
362
363 // Returns the current thread (ASSERTS if NULL)
364 static inline Thread* current();
365 // Returns the current thread, or NULL if not attached
366 static inline Thread* current_or_null();
367 // Returns the current thread, or NULL if not attached, and is
368 // safe for use from signal-handlers
369 static inline Thread* current_or_null_safe();
370
371 // Common thread operations
372 #ifdef ASSERT
373 static void check_for_dangling_thread_pointer(Thread *thread);
374 #endif
375 static void set_priority(Thread* thread, ThreadPriority priority);
376 static ThreadPriority get_priority(const Thread* const thread);
377 static void start(Thread* thread);
378
379 void set_native_thread_name(const char *name) {
380 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
381 os::set_native_thread_name(name);
382 }
383
384 // Support for Unhandled Oop detection
385 // Add the field for both, fastdebug and debug, builds to keep
386 // Thread's fields layout the same.
387 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build.
388 #ifdef CHECK_UNHANDLED_OOPS
389 private:
390 UnhandledOops* _unhandled_oops;
391 #elif defined(ASSERT)
392 private:
393 void* _unhandled_oops;
394 #endif
395 #ifdef CHECK_UNHANDLED_OOPS
396 public:
397 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
398 // Mark oop safe for gc. It may be stack allocated but won't move.
399 void allow_unhandled_oop(oop *op) {
400 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
401 }
402 // Clear oops at safepoint so crashes point to unhandled oop violator
403 void clear_unhandled_oops() {
404 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
405 }
406 #endif // CHECK_UNHANDLED_OOPS
407
408 public:
409 #ifndef PRODUCT
410 bool skip_gcalot() { return _skip_gcalot; }
411 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
412 #endif
413
414 // Resource area
415 ResourceArea* resource_area() const { return _resource_area; }
416 void set_resource_area(ResourceArea* area) { _resource_area = area; }
417
418 OSThread* osthread() const { return _osthread; }
419 void set_osthread(OSThread* thread) { _osthread = thread; }
420
421 // JNI handle support
422 JNIHandleBlock* active_handles() const { return _active_handles; }
423 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
424 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
425 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
426
427 // Internal handle support
428 HandleArea* handle_area() const { return _handle_area; }
429 void set_handle_area(HandleArea* area) { _handle_area = area; }
430
431 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
432 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
433
434 // Thread-Local Allocation Buffer (TLAB) support
435 ThreadLocalAllocBuffer& tlab() { return _tlab; }
436 void initialize_tlab();
437
438 jlong allocated_bytes() { return _allocated_bytes; }
439 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
440 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
441 inline jlong cooked_allocated_bytes();
442
443 ThreadHeapSampler& heap_sampler() { return _heap_sampler; }
444
445 ThreadStatisticalInfo& statistical_info() { return _statistical_info; }
446
447 JFR_ONLY(DEFINE_THREAD_LOCAL_ACCESSOR_JFR;)
448
449 // For tracking the Jvmti raw monitor the thread is pending on.
450 JvmtiRawMonitor* current_pending_raw_monitor() {
451 return _current_pending_raw_monitor;
452 }
453 void set_current_pending_raw_monitor(JvmtiRawMonitor* monitor) {
454 _current_pending_raw_monitor = monitor;
455 }
456
457 // GC support
458 // Apply "f->do_oop" to all root oops in "this".
459 // Used by JavaThread::oops_do.
460 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
461 virtual void oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf);
462 virtual void oops_do_frames(OopClosure* f, CodeBlobClosure* cf) {}
463 void oops_do(OopClosure* f, CodeBlobClosure* cf);
464
465 // Handles the parallel case for claim_threads_do.
466 private:
467 bool claim_par_threads_do(uintx claim_token);
468 public:
469 // Requires that "claim_token" is that of the current iteration.
470 // If "is_par" is false, sets the token of "this" to
471 // "claim_token", and returns "true". If "is_par" is true,
472 // uses an atomic instruction to set the current thread's token to
473 // "claim_token", if it is not already. Returns "true" iff the
474 // calling thread does the update, this indicates that the calling thread
475 // has claimed the thread in the current iteration.
476 bool claim_threads_do(bool is_par, uintx claim_token) {
477 if (!is_par) {
478 _threads_do_token = claim_token;
479 return true;
480 } else {
481 return claim_par_threads_do(claim_token);
482 }
483 }
484
485 uintx threads_do_token() const { return _threads_do_token; }
486
487 // jvmtiRedefineClasses support
488 void metadata_handles_do(void f(Metadata*));
489
490 private:
491 // Check if address is within the given range of this thread's
492 // stack: stack_base() > adr >/>= limit
493 // The check is inclusive of limit if passed true, else exclusive.
494 bool is_in_stack_range(address adr, address limit, bool inclusive) const {
495 assert(stack_base() > limit && limit >= stack_end(), "limit is outside of stack");
496 return stack_base() > adr && (inclusive ? adr >= limit : adr > limit);
497 }
498
499 public:
500 // Used by fast lock support
501 virtual bool is_lock_owned(address adr) const;
502
503 // Check if address is within the given range of this thread's
504 // stack: stack_base() > adr >= limit
505 bool is_in_stack_range_incl(address adr, address limit) const {
506 return is_in_stack_range(adr, limit, true);
507 }
508
509 // Check if address is within the given range of this thread's
510 // stack: stack_base() > adr > limit
511 bool is_in_stack_range_excl(address adr, address limit) const {
512 return is_in_stack_range(adr, limit, false);
513 }
514
515 // Check if address is in the stack mapped to this thread. Used mainly in
516 // error reporting (so has to include guard zone) and frame printing.
517 // Expects _stack_base to be initialized - checked with assert.
518 bool is_in_full_stack_checked(address adr) const {
519 return is_in_stack_range_incl(adr, stack_end());
520 }
521
522 // Like is_in_full_stack_checked but without the assertions as this
523 // may be called in a thread before _stack_base is initialized.
524 bool is_in_full_stack(address adr) const {
525 address stack_end = _stack_base - _stack_size;
526 return _stack_base > adr && adr >= stack_end;
527 }
528
529 // Check if address is in the live stack of this thread (not just for locks).
530 // Warning: can only be called by the current thread on itself.
531 bool is_in_live_stack(address adr) const {
532 assert(Thread::current() == this, "is_in_live_stack can only be called from current thread");
533 return is_in_stack_range_incl(adr, os::current_stack_pointer());
534 }
535
536 // Sets this thread as starting thread. Returns failure if thread
537 // creation fails due to lack of memory, too many threads etc.
538 bool set_as_starting_thread();
539
540 protected:
541 // OS data associated with the thread
542 OSThread* _osthread; // Platform-specific thread information
543
544 // Thread local resource area for temporary allocation within the VM
545 ResourceArea* _resource_area;
546
547 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
548
549 // Thread local handle area for allocation of handles within the VM
550 HandleArea* _handle_area;
551 GrowableArray<Metadata*>* _metadata_handles;
552
553 // Support for stack overflow handling, get_thread, etc.
554 address _stack_base;
555 size_t _stack_size;
556 int _lgrp_id;
557
558 public:
559 // Stack overflow support
560 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
561 void set_stack_base(address base) { _stack_base = base; }
562 size_t stack_size() const { return _stack_size; }
563 void set_stack_size(size_t size) { _stack_size = size; }
564 address stack_end() const { return stack_base() - stack_size(); }
565 void record_stack_base_and_size();
566 void register_thread_stack_with_NMT() NOT_NMT_RETURN;
567 void unregister_thread_stack_with_NMT() NOT_NMT_RETURN;
568
569 int lgrp_id() const { return _lgrp_id; }
570 void set_lgrp_id(int value) { _lgrp_id = value; }
571
572 // Printing
573 void print_on(outputStream* st, bool print_extended_info) const;
574 virtual void print_on(outputStream* st) const { print_on(st, false); }
575 void print() const;
576 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
577 void print_value_on(outputStream* st) const;
578
579 // Debug-only code
580 #ifdef ASSERT
581 private:
582 // Deadlock detection support for Mutex locks. List of locks own by thread.
583 Mutex* _owned_locks;
584 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
585 // thus the friendship
586 friend class Mutex;
587 friend class Monitor;
588
589 public:
590 void print_owned_locks_on(outputStream* st) const;
591 void print_owned_locks() const { print_owned_locks_on(tty); }
592 Mutex* owned_locks() const { return _owned_locks; }
593 bool owns_locks() const { return owned_locks() != NULL; }
594
595 // Deadlock detection
596 ResourceMark* current_resource_mark() { return _current_resource_mark; }
597 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
598 #endif // ASSERT
599
600 private:
601 volatile int _jvmti_env_iteration_count;
602
603 public:
604 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
605 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
606 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
607
608 // Code generation
609 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); }
610 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); }
611 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); }
612
613 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); }
614 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); }
615
616 static ByteSize tlab_start_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::start_offset(); }
617 static ByteSize tlab_end_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::end_offset(); }
618 static ByteSize tlab_top_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::top_offset(); }
619 static ByteSize tlab_pf_top_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::pf_top_offset(); }
620
621 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); }
622
623 JFR_ONLY(DEFINE_THREAD_LOCAL_OFFSET_JFR;)
624
625 public:
626 ParkEvent * volatile _ParkEvent; // for Object monitors, JVMTI raw monitors,
627 // and ObjectSynchronizer::read_stable_mark
628
629 // Termination indicator used by the signal handler.
630 // _ParkEvent is just a convenient field we can NULL out after setting the JavaThread termination state
631 // (which can't itself be read from the signal handler if a signal hits during the Thread destructor).
632 bool has_terminated() { return Atomic::load(&_ParkEvent) == NULL; };
633
634 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG
635 jint _hashStateX; // thread-specific hashCode generator state
636 jint _hashStateY;
637 jint _hashStateZ;
638
639 // Low-level leaf-lock primitives used to implement synchronization.
640 // Not for general synchronization use.
641 static void SpinAcquire(volatile int * Lock, const char * Name);
642 static void SpinRelease(volatile int * Lock);
643
644 #if defined(__APPLE__) && defined(AARCH64)
645 private:
646 DEBUG_ONLY(bool _wx_init);
647 WXMode _wx_state;
648 public:
649 void init_wx();
650 WXMode enable_wx(WXMode new_state);
651
652 void assert_wx_state(WXMode expected) {
653 assert(_wx_state == expected, "wrong state");
654 }
655 #endif // __APPLE__ && AARCH64
656
657 private:
658 bool _in_asgct = false;
659 public:
660 bool in_asgct() const { return _in_asgct; }
661 void set_in_asgct(bool value) { _in_asgct = value; }
662 static bool current_in_asgct() {
663 Thread *cur = Thread::current_or_null_safe();
664 return cur != nullptr && cur->in_asgct();
665 }
666 };
667
668 class ThreadInAsgct {
669 private:
670 Thread* _thread;
671 public:
672 ThreadInAsgct(Thread* thread) : _thread(thread) {
673 assert(thread != nullptr, "invariant");
674 assert(!thread->in_asgct(), "invariant");
675 thread->set_in_asgct(true);
676 }
677 ~ThreadInAsgct() {
678 assert(_thread->in_asgct(), "invariant");
679 _thread->set_in_asgct(false);
680 }
681 };
682
683 // Inline implementation of Thread::current()
684 inline Thread* Thread::current() {
685 Thread* current = current_or_null();
686 assert(current != NULL, "Thread::current() called on detached thread");
687 return current;
688 }
689
690 inline Thread* Thread::current_or_null() {
691 #ifndef USE_LIBRARY_BASED_TLS_ONLY
692 return _thr_current;
693 #else
694 if (ThreadLocalStorage::is_initialized()) {
695 return ThreadLocalStorage::thread();
696 }
697 return NULL;
698 #endif
699 }
700
701 inline Thread* Thread::current_or_null_safe() {
702 if (ThreadLocalStorage::is_initialized()) {
703 return ThreadLocalStorage::thread();
704 }
705 return NULL;
706 }
707
708 class CompilerThread;
709
710 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
711
712 class JavaThread: public Thread {
713 friend class VMStructs;
714 friend class JVMCIVMStructs;
715 friend class WhiteBox;
716 friend class ThreadsSMRSupport; // to access _threadObj for exiting_threads_oops_do
717 friend class HandshakeState;
718 private:
719 bool _in_asgct; // Is set when this JavaThread is handling ASGCT call
720 bool _on_thread_list; // Is set when this JavaThread is added to the Threads list
721 OopHandle _threadObj; // The Java level thread object
722
723 #ifdef ASSERT
724 private:
725 int _java_call_counter;
726
727 public:
728 int java_call_counter() { return _java_call_counter; }
729 void inc_java_call_counter() { _java_call_counter++; }
730 void dec_java_call_counter() {
731 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
732 _java_call_counter--;
733 }
734 private: // restore original namespace restriction
735 #endif // ifdef ASSERT
736
737 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
738
739 ThreadFunction _entry_point;
740
741 JNIEnv _jni_environment;
742
743 // Deopt support
744 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
745
746 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized
747 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
748 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
749 // Holds updates by JVMTI agents for compiled frames that cannot be performed immediately. They
750 // will be carried out as soon as possible which, in most cases, is just before deoptimization of
751 // the frame, when control returns to it.
752 JvmtiDeferredUpdates* _jvmti_deferred_updates;
753
754 // Handshake value for fixing 6243940. We need a place for the i2c
755 // adapter to store the callee Method*. This value is NEVER live
756 // across a gc point so it does NOT have to be gc'd
757 // The handshake is open ended since we can't be certain that it will
758 // be NULLed. This is because we rarely ever see the race and end up
759 // in handle_wrong_method which is the backend of the handshake. See
760 // code in i2c adapters and handle_wrong_method.
761
762 Method* _callee_target;
763
764 // Used to pass back results to the interpreter or generated code running Java code.
765 oop _vm_result; // oop result is GC-preserved
766 Metadata* _vm_result_2; // non-oop result
767
768 // See ReduceInitialCardMarks: this holds the precise space interval of
769 // the most recent slow path allocation for which compiled code has
770 // elided card-marks for performance along the fast-path.
771 MemRegion _deferred_card_mark;
772
773 ObjectMonitor* volatile _current_pending_monitor; // ObjectMonitor this thread is waiting to lock
774 bool _current_pending_monitor_is_from_java; // locking is from Java code
775 ObjectMonitor* volatile _current_waiting_monitor; // ObjectMonitor on which this thread called Object.wait()
776 public:
777 volatile intptr_t _Stalled;
778
779 // For tracking the heavyweight monitor the thread is pending on.
780 ObjectMonitor* current_pending_monitor() {
781 // Use Atomic::load() to prevent data race between concurrent modification and
782 // concurrent readers, e.g. ThreadService::get_current_contended_monitor().
783 // Especially, reloading pointer from thread after NULL check must be prevented.
784 return Atomic::load(&_current_pending_monitor);
785 }
786 void set_current_pending_monitor(ObjectMonitor* monitor) {
787 Atomic::store(&_current_pending_monitor, monitor);
788 }
789 void set_current_pending_monitor_is_from_java(bool from_java) {
790 _current_pending_monitor_is_from_java = from_java;
791 }
792 bool current_pending_monitor_is_from_java() {
793 return _current_pending_monitor_is_from_java;
794 }
795 ObjectMonitor* current_waiting_monitor() {
796 // See the comment in current_pending_monitor() above.
797 return Atomic::load(&_current_waiting_monitor);
798 }
799 void set_current_waiting_monitor(ObjectMonitor* monitor) {
800 Atomic::store(&_current_waiting_monitor, monitor);
801 }
802
803 private:
804 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
805 // allocated during deoptimization
806 // and by JNI_MonitorEnter/Exit
807
808 enum SuspendFlags {
809 // NOTE: avoid using the sign-bit as cc generates different test code
810 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
811 _has_async_exception = 0x00000001U, // there is a pending async exception
812 _trace_flag = 0x00000004U, // call tracing backend
813 _obj_deopt = 0x00000008U // suspend for object reallocation and relocking for JVMTI agent
814 };
815
816 // various suspension related flags - atomically updated
817 // overloaded with async exceptions so that we do a single check when transitioning from native->Java
818 volatile uint32_t _suspend_flags;
819
820 inline void set_suspend_flag(SuspendFlags f);
821 inline void clear_suspend_flag(SuspendFlags f);
822
823 public:
824 inline void set_trace_flag();
825 inline void clear_trace_flag();
826 inline void set_obj_deopt_flag();
827 inline void clear_obj_deopt_flag();
828 bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; }
829 bool is_obj_deopt_suspend() { return (_suspend_flags & _obj_deopt) != 0; }
830
831 // Asynchronous exceptions support
832 private:
833 enum AsyncExceptionCondition {
834 _no_async_condition = 0,
835 _async_exception,
836 _async_unsafe_access_error
837 };
838 AsyncExceptionCondition _async_exception_condition;
839 oop _pending_async_exception;
840
841 void set_async_exception_condition(AsyncExceptionCondition aec) { _async_exception_condition = aec; }
842 AsyncExceptionCondition clear_async_exception_condition() {
843 AsyncExceptionCondition x = _async_exception_condition;
844 _async_exception_condition = _no_async_condition;
845 return x;
846 }
847
848 public:
849 bool has_async_exception_condition(bool check_unsafe_access_error = true) {
850 return check_unsafe_access_error ? _async_exception_condition != _no_async_condition
851 : _async_exception_condition == _async_exception;
852 }
853 inline void set_pending_async_exception(oop e);
854 void set_pending_unsafe_access_error() {
855 // Don't overwrite an asynchronous exception sent by another thread
856 if (_async_exception_condition == _no_async_condition) {
857 set_async_exception_condition(_async_unsafe_access_error);
858 }
859 }
860 void check_and_handle_async_exceptions();
861 // Installs a pending exception to be inserted later
862 static void send_async_exception(oop thread_oop, oop java_throwable);
863 void send_thread_stop(oop throwable);
864
865 // Safepoint support
866 public: // Expose _thread_state for SafeFetchInt()
867 volatile JavaThreadState _thread_state;
868 private:
869 SafepointMechanism::ThreadData _poll_data;
870 ThreadSafepointState* _safepoint_state; // Holds information about a thread during a safepoint
871 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
872 NOT_PRODUCT(bool _requires_cross_modify_fence;) // State used by VerifyCrossModifyFence
873 #ifdef ASSERT
874 // Debug support for checking if code allows safepoints or not.
875 // Safepoints in the VM can happen because of allocation, invoking a VM operation, or blocking on
876 // mutex, or blocking on an object synchronizer (Java locking).
877 // If _no_safepoint_count is non-zero, then an assertion failure will happen in any of
878 // the above cases. The class NoSafepointVerifier is used to set this counter.
879 int _no_safepoint_count; // If 0, thread allow a safepoint to happen
880
881 public:
882 void inc_no_safepoint_count() { _no_safepoint_count++; }
883 void dec_no_safepoint_count() { _no_safepoint_count--; }
884 #endif // ASSERT
885 public:
886 // These functions check conditions before possibly going to a safepoint.
887 // including NoSafepointVerifier.
888 void check_for_valid_safepoint_state() NOT_DEBUG_RETURN;
889 void check_possible_safepoint() NOT_DEBUG_RETURN;
890
891 #ifdef ASSERT
892 private:
893 volatile uint64_t _visited_for_critical_count;
894
895 public:
896 void set_visited_for_critical_count(uint64_t safepoint_id) {
897 assert(_visited_for_critical_count == 0, "Must be reset before set");
898 assert((safepoint_id & 0x1) == 1, "Must be odd");
899 _visited_for_critical_count = safepoint_id;
900 }
901 void reset_visited_for_critical_count(uint64_t safepoint_id) {
902 assert(_visited_for_critical_count == safepoint_id, "Was not visited");
903 _visited_for_critical_count = 0;
904 }
905 bool was_visited_for_critical_count(uint64_t safepoint_id) const {
906 return _visited_for_critical_count == safepoint_id;
907 }
908 #endif // ASSERT
909
910 // JavaThread termination support
911 public:
912 enum TerminatedTypes {
913 _not_terminated = 0xDEAD - 2,
914 _thread_exiting, // JavaThread::exit() has been called for this thread
915 _thread_terminated, // JavaThread is removed from thread list
916 _vm_exited // JavaThread is still executing native code, but VM is terminated
917 // only VM_Exit can set _vm_exited
918 };
919
920 private:
921 // In general a JavaThread's _terminated field transitions as follows:
922 //
923 // _not_terminated => _thread_exiting => _thread_terminated
924 //
925 // _vm_exited is a special value to cover the case of a JavaThread
926 // executing native code after the VM itself is terminated.
927 volatile TerminatedTypes _terminated;
928
929 jint _in_deopt_handler; // count of deoptimization
930 // handlers thread is in
931 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
932 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
933 // never locked) when throwing an exception. Used by interpreter only.
934
935 // JNI attach states:
936 enum JNIAttachStates {
937 _not_attaching_via_jni = 1, // thread is not attaching via JNI
938 _attaching_via_jni, // thread is attaching via JNI
939 _attached_via_jni // thread has attached via JNI
940 };
941
942 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
943 // A native thread that is attaching via JNI starts with a value
944 // of _attaching_via_jni and transitions to _attached_via_jni.
945 volatile JNIAttachStates _jni_attach_state;
946
947
948 #if INCLUDE_JVMCI
949 // The _pending_* fields below are used to communicate extra information
950 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler.
951
952 // Communicates the DeoptReason and DeoptAction of the uncommon trap
953 int _pending_deoptimization;
954
955 // Specifies whether the uncommon trap is to bci 0 of a synchronized method
956 // before the monitor has been acquired.
957 bool _pending_monitorenter;
958
959 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter
960 bool _pending_transfer_to_interpreter;
961
962 // True if in a runtime call from compiled code that will deoptimize
963 // and re-execute a failed heap allocation in the interpreter.
964 bool _in_retryable_allocation;
965
966 // An id of a speculation that JVMCI compiled code can use to further describe and
967 // uniquely identify the speculative optimization guarded by an uncommon trap.
968 // See JVMCINMethodData::SPECULATION_LENGTH_BITS for further details.
969 jlong _pending_failed_speculation;
970
971 // These fields are mutually exclusive in terms of live ranges.
972 union {
973 // Communicates the pc at which the most recent implicit exception occurred
974 // from the signal handler to a deoptimization stub.
975 address _implicit_exception_pc;
976
977 // Communicates an alternative call target to an i2c stub from a JavaCall .
978 address _alternate_call_target;
979 } _jvmci;
980
981 // Support for high precision, thread sensitive counters in JVMCI compiled code.
982 jlong* _jvmci_counters;
983
984 // Fast thread locals for use by JVMCI
985 jlong _jvmci_reserved0;
986 jlong _jvmci_reserved1;
987 oop _jvmci_reserved_oop0;
988
989 public:
990 static jlong* _jvmci_old_thread_counters;
991 static void collect_counters(jlong* array, int length);
992
993 bool resize_counters(int current_size, int new_size);
994
995 static bool resize_all_jvmci_counters(int new_size);
996
997 void set_jvmci_reserved_oop0(oop value) {
998 _jvmci_reserved_oop0 = value;
999 }
1000
1001 oop get_jvmci_reserved_oop0() {
1002 return _jvmci_reserved_oop0;
1003 }
1004
1005 void set_jvmci_reserved0(jlong value) {
1006 _jvmci_reserved0 = value;
1007 }
1008
1009 jlong get_jvmci_reserved0() {
1010 return _jvmci_reserved0;
1011 }
1012
1013 void set_jvmci_reserved1(jlong value) {
1014 _jvmci_reserved1 = value;
1015 }
1016
1017 jlong get_jvmci_reserved1() {
1018 return _jvmci_reserved1;
1019 }
1020
1021 private:
1022 #endif // INCLUDE_JVMCI
1023
1024 StackOverflow _stack_overflow_state;
1025
1026 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
1027 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
1028 // code)
1029 volatile oop _exception_oop; // Exception thrown in compiled code
1030 volatile address _exception_pc; // PC where exception happened
1031 volatile address _exception_handler_pc; // PC for handler of exception
1032 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
1033
1034 private:
1035 // support for JNI critical regions
1036 jint _jni_active_critical; // count of entries into JNI critical region
1037
1038 // Checked JNI: function name requires exception check
1039 char* _pending_jni_exception_check_fn;
1040
1041 // For deadlock detection.
1042 int _depth_first_number;
1043
1044 // JVMTI PopFrame support
1045 // This is set to popframe_pending to signal that top Java frame should be popped immediately
1046 int _popframe_condition;
1047
1048 // If reallocation of scalar replaced objects fails, we throw OOM
1049 // and during exception propagation, pop the top
1050 // _frames_to_pop_failed_realloc frames, the ones that reference
1051 // failed reallocations.
1052 int _frames_to_pop_failed_realloc;
1053
1054 friend class VMThread;
1055 friend class ThreadWaitTransition;
1056 friend class VM_Exit;
1057
1058 // Stack watermark barriers.
1059 StackWatermarks _stack_watermarks;
1060
1061 public:
1062 inline StackWatermarks* stack_watermarks() { return &_stack_watermarks; }
1063
1064 public:
1065 // Constructor
1066 JavaThread(); // delegating constructor
1067 JavaThread(bool is_attaching_via_jni); // for main thread and JNI attached threads
1068 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
1069 ~JavaThread();
1070
1071 #ifdef ASSERT
1072 // verify this JavaThread hasn't be published in the Threads::list yet
1073 void verify_not_published();
1074 #endif // ASSERT
1075
1076 StackOverflow* stack_overflow_state() { return &_stack_overflow_state; }
1077
1078 //JNI functiontable getter/setter for JVMTI jni function table interception API.
1079 void set_jni_functions(struct JNINativeInterface_* functionTable) {
1080 _jni_environment.functions = functionTable;
1081 }
1082 struct JNINativeInterface_* get_jni_functions() {
1083 return (struct JNINativeInterface_ *)_jni_environment.functions;
1084 }
1085
1086 // This function is called at thread creation to allow
1087 // platform specific thread variables to be initialized.
1088 void cache_global_variables();
1089
1090 // Executes Shutdown.shutdown()
1091 void invoke_shutdown_hooks();
1092
1093 // Cleanup on thread exit
1094 enum ExitType {
1095 normal_exit,
1096 jni_detach
1097 };
1098 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1099
1100 void cleanup_failed_attach_current_thread(bool is_daemon);
1101
1102 // Testers
1103 virtual bool is_Java_thread() const { return true; }
1104 virtual bool can_call_java() const { return true; }
1105
1106 virtual bool is_active_Java_thread() const {
1107 return on_thread_list() && !is_terminated();
1108 }
1109
1110 // Thread oop. threadObj() can be NULL for initial JavaThread
1111 // (or for threads attached via JNI)
1112 oop threadObj() const;
1113 void set_threadObj(oop p);
1114
1115 // Prepare thread and add to priority queue. If a priority is
1116 // not specified, use the priority of the thread object. Threads_lock
1117 // must be held while this function is called.
1118 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1119
1120 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1121 address saved_exception_pc() { return _saved_exception_pc; }
1122
1123 ThreadFunction entry_point() const { return _entry_point; }
1124
1125 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1126 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS);
1127
1128 // Last frame anchor routines
1129
1130 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1131
1132 // last_Java_sp
1133 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1134 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1135
1136 // last_Java_pc
1137
1138 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1139
1140 // Safepoint support
1141 inline JavaThreadState thread_state() const;
1142 inline void set_thread_state(JavaThreadState s);
1143 inline void set_thread_state_fence(JavaThreadState s); // fence after setting thread state
1144 inline ThreadSafepointState* safepoint_state() const;
1145 inline void set_safepoint_state(ThreadSafepointState* state);
1146 inline bool is_at_poll_safepoint();
1147
1148 // JavaThread termination and lifecycle support:
1149 void smr_delete();
1150 bool on_thread_list() const { return _on_thread_list; }
1151 void set_on_thread_list() { _on_thread_list = true; }
1152
1153 // thread has called JavaThread::exit() or is terminated
1154 bool is_exiting() const;
1155 // thread is terminated (no longer on the threads list); we compare
1156 // against the two non-terminated values so that a freed JavaThread
1157 // will also be considered terminated.
1158 bool check_is_terminated(TerminatedTypes l_terminated) const {
1159 return l_terminated != _not_terminated && l_terminated != _thread_exiting;
1160 }
1161 bool is_terminated() const;
1162 void set_terminated(TerminatedTypes t);
1163
1164 void block_if_vm_exited();
1165
1166 bool doing_unsafe_access() { return _doing_unsafe_access; }
1167 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1168
1169 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1170 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1171
1172 SafepointMechanism::ThreadData* poll_data() { return &_poll_data; }
1173
1174 void set_requires_cross_modify_fence(bool val) PRODUCT_RETURN NOT_PRODUCT({ _requires_cross_modify_fence = val; })
1175
1176 private:
1177 DEBUG_ONLY(void verify_frame_info();)
1178
1179 // Support for thread handshake operations
1180 HandshakeState _handshake;
1181 public:
1182 HandshakeState* handshake_state() { return &_handshake; }
1183
1184 // A JavaThread can always safely operate on it self and other threads
1185 // can do it safely if they are the active handshaker.
1186 bool is_handshake_safe_for(Thread* th) const {
1187 return _handshake.active_handshaker() == th || this == th;
1188 }
1189
1190 // Suspend/resume support for JavaThread
1191 bool java_suspend(); // higher-level suspension logic called by the public APIs
1192 bool java_resume(); // higher-level resume logic called by the public APIs
1193 bool is_suspended() { return _handshake.is_suspended(); }
1194
1195 // Check for async exception in addition to safepoint.
1196 static void check_special_condition_for_native_trans(JavaThread *thread);
1197
1198 // Synchronize with another thread that is deoptimizing objects of the
1199 // current thread, i.e. reverts optimizations based on escape analysis.
1200 void wait_for_object_deoptimization();
1201
1202 // these next two are also used for self-suspension and async exception support
1203 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1204
1205 // Return true if JavaThread has an asynchronous condition or
1206 // if external suspension is requested.
1207 bool has_special_runtime_exit_condition() {
1208 return (_async_exception_condition != _no_async_condition) ||
1209 (_suspend_flags & (_obj_deopt JFR_ONLY(| _trace_flag))) != 0;
1210 }
1211
1212 // Fast-locking support
1213 bool is_lock_owned(address adr) const;
1214
1215 // Accessors for vframe array top
1216 // The linked list of vframe arrays are sorted on sp. This means when we
1217 // unpack the head must contain the vframe array to unpack.
1218 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1219 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1220
1221 // Side structure for deferring update of java frame locals until deopt occurs
1222 JvmtiDeferredUpdates* deferred_updates() const { return _jvmti_deferred_updates; }
1223 void set_deferred_updates(JvmtiDeferredUpdates* du) { _jvmti_deferred_updates = du; }
1224
1225 // These only really exist to make debugging deopt problems simpler
1226
1227 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1228 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1229
1230 // The special resourceMark used during deoptimization
1231
1232 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1233 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1234
1235 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; }
1236 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; }
1237
1238 Method* callee_target() const { return _callee_target; }
1239 void set_callee_target (Method* x) { _callee_target = x; }
1240
1241 // Oop results of vm runtime calls
1242 oop vm_result() const { return _vm_result; }
1243 void set_vm_result (oop x) { _vm_result = x; }
1244
1245 Metadata* vm_result_2() const { return _vm_result_2; }
1246 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1247
1248 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1249 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1250
1251 #if INCLUDE_JVMCI
1252 int pending_deoptimization() const { return _pending_deoptimization; }
1253 jlong pending_failed_speculation() const { return _pending_failed_speculation; }
1254 bool has_pending_monitorenter() const { return _pending_monitorenter; }
1255 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; }
1256 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; }
1257 void set_pending_failed_speculation(jlong failed_speculation) { _pending_failed_speculation = failed_speculation; }
1258 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; }
1259 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; }
1260 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; }
1261
1262 virtual bool in_retryable_allocation() const { return _in_retryable_allocation; }
1263 void set_in_retryable_allocation(bool b) { _in_retryable_allocation = b; }
1264 #endif // INCLUDE_JVMCI
1265
1266 // Exception handling for compiled methods
1267 oop exception_oop() const;
1268 address exception_pc() const { return _exception_pc; }
1269 address exception_handler_pc() const { return _exception_handler_pc; }
1270 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1271
1272 void set_exception_oop(oop o);
1273 void set_exception_pc(address a) { _exception_pc = a; }
1274 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1275 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1276
1277 void clear_exception_oop_and_pc() {
1278 set_exception_oop(NULL);
1279 set_exception_pc(NULL);
1280 }
1281
1282 // Check if address is in the usable part of the stack (excludes protected
1283 // guard pages). Can be applied to any thread and is an approximation for
1284 // using is_in_live_stack when the query has to happen from another thread.
1285 bool is_in_usable_stack(address adr) const {
1286 return is_in_stack_range_incl(adr, _stack_overflow_state.stack_reserved_zone_base());
1287 }
1288
1289 // Misc. accessors/mutators
1290 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1291 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1292 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1293
1294 // For assembly stub generation
1295 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
1296 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
1297 static ByteSize pending_jni_exception_check_fn_offset() {
1298 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn);
1299 }
1300 static ByteSize last_Java_sp_offset() {
1301 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1302 }
1303 static ByteSize last_Java_pc_offset() {
1304 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1305 }
1306 static ByteSize frame_anchor_offset() {
1307 return byte_offset_of(JavaThread, _anchor);
1308 }
1309 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); }
1310 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); }
1311 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); }
1312 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); }
1313 static ByteSize polling_word_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_word);}
1314 static ByteSize polling_page_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_page);}
1315 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
1316 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
1317 #if INCLUDE_JVMCI
1318 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); }
1319 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); }
1320 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); }
1321 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); }
1322 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); }
1323 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); }
1324 #endif // INCLUDE_JVMCI
1325 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); }
1326 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); }
1327 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1328 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1329
1330 // StackOverflow offsets
1331 static ByteSize stack_overflow_limit_offset() {
1332 return byte_offset_of(JavaThread, _stack_overflow_state._stack_overflow_limit);
1333 }
1334 static ByteSize stack_guard_state_offset() {
1335 return byte_offset_of(JavaThread, _stack_overflow_state._stack_guard_state);
1336 }
1337 static ByteSize reserved_stack_activation_offset() {
1338 return byte_offset_of(JavaThread, _stack_overflow_state._reserved_stack_activation);
1339 }
1340
1341 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); }
1342
1343 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1344 static ByteSize should_post_on_exceptions_flag_offset() {
1345 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1346 }
1347 static ByteSize doing_unsafe_access_offset() { return byte_offset_of(JavaThread, _doing_unsafe_access); }
1348 NOT_PRODUCT(static ByteSize requires_cross_modify_fence_offset() { return byte_offset_of(JavaThread, _requires_cross_modify_fence); })
1349
1350 // Returns the jni environment for this thread
1351 JNIEnv* jni_environment() { return &_jni_environment; }
1352
1353 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1354 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1355 // Only return NULL if thread is off the thread list; starting to
1356 // exit should not return NULL.
1357 if (thread_from_jni_env->is_terminated()) {
1358 thread_from_jni_env->block_if_vm_exited();
1359 return NULL;
1360 } else {
1361 return thread_from_jni_env;
1362 }
1363 }
1364
1365 // JNI critical regions. These can nest.
1366 bool in_critical() { return _jni_active_critical > 0; }
1367 bool in_last_critical() { return _jni_active_critical == 1; }
1368 inline void enter_critical();
1369 void exit_critical() {
1370 assert(Thread::current() == this, "this must be current thread");
1371 _jni_active_critical--;
1372 assert(_jni_active_critical >= 0, "JNI critical nesting problem?");
1373 }
1374
1375 // Checked JNI: is the programmer required to check for exceptions, if so specify
1376 // which function name. Returning to a Java frame should implicitly clear the
1377 // pending check, this is done for Native->Java transitions (i.e. user JNI code).
1378 // VM->Java transistions are not cleared, it is expected that JNI code enclosed
1379 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal).
1380 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1381 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1382 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1383 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1384
1385 // For deadlock detection
1386 int depth_first_number() { return _depth_first_number; }
1387 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1388
1389 private:
1390 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1391
1392 public:
1393 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1394 void add_monitor_chunk(MonitorChunk* chunk);
1395 void remove_monitor_chunk(MonitorChunk* chunk);
1396 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1397 void inc_in_deopt_handler() { _in_deopt_handler++; }
1398 void dec_in_deopt_handler() {
1399 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1400 if (_in_deopt_handler > 0) { // robustness
1401 _in_deopt_handler--;
1402 }
1403 }
1404
1405 private:
1406 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1407
1408 public:
1409
1410 // Frame iteration; calls the function f for all frames on the stack
1411 void frames_do(void f(frame*, const RegisterMap*));
1412
1413 // Memory operations
1414 void oops_do_frames(OopClosure* f, CodeBlobClosure* cf);
1415 void oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf);
1416
1417 // Sweeper operations
1418 virtual void nmethods_do(CodeBlobClosure* cf);
1419
1420 // RedefineClasses Support
1421 void metadata_do(MetadataClosure* f);
1422
1423 // Debug method asserting thread states are correct during a handshake operation.
1424 DEBUG_ONLY(void verify_states_for_handshake();)
1425
1426 // Misc. operations
1427 char* name() const { return (char*)get_thread_name(); }
1428 static const char* name_for(oop thread_obj);
1429 void print_on(outputStream* st, bool print_extended_info) const;
1430 void print_on(outputStream* st) const { print_on(st, false); }
1431 void print() const;
1432 void print_thread_state_on(outputStream*) const PRODUCT_RETURN;
1433 void print_on_error(outputStream* st, char* buf, int buflen) const;
1434 void print_name_on_error(outputStream* st, char* buf, int buflen) const;
1435 void verify();
1436 const char* get_thread_name() const;
1437 protected:
1438 // factor out low-level mechanics for use in both normal and error cases
1439 virtual const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1440 public:
1441 // Accessing frames
1442 frame last_frame() {
1443 _anchor.make_walkable();
1444 return pd_last_frame();
1445 }
1446 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1447
1448 // Returns method at 'depth' java or native frames down the stack
1449 // Used for security checks
1450 Klass* security_get_caller_class(int depth);
1451
1452 // Print stack trace in external format
1453 void print_stack_on(outputStream* st);
1454 void print_stack() { print_stack_on(tty); }
1455 // Print current stack trace for checked JNI warnings and JNI fatal errors.
1456 // This is the external format from above, but selecting the platform
1457 // as applicable.
1458 void print_jni_stack();
1459
1460 // Print stack traces in various internal formats
1461 void trace_stack() PRODUCT_RETURN;
1462 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1463 void trace_frames() PRODUCT_RETURN;
1464
1465 // Print an annotated view of the stack frames
1466 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1467 void validate_frame_layout() {
1468 print_frame_layout(0, true);
1469 }
1470
1471 // Function for testing deoptimization
1472 void deoptimize();
1473 void make_zombies();
1474
1475 void deoptimize_marked_methods();
1476
1477 public:
1478 // Returns the running thread as a JavaThread
1479 static inline JavaThread* current();
1480 // Returns the current thread as a JavaThread, or NULL if not attached
1481 static inline JavaThread* current_or_null();
1482
1483 // Returns the active Java thread. Do not use this if you know you are calling
1484 // from a JavaThread, as it's slower than JavaThread::current. If called from
1485 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1486 // operation. You may not want that either.
1487 static JavaThread* active();
1488
1489 protected:
1490 virtual void pre_run();
1491 virtual void run();
1492 void thread_main_inner();
1493 virtual void post_run();
1494
1495 public:
1496 // Thread local information maintained by JVMTI.
1497 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1498 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1499 // getter is used to get this JavaThread's JvmtiThreadState if it has
1500 // one which means NULL can be returned. JvmtiThreadState::state_for()
1501 // is used to get the specified JavaThread's JvmtiThreadState if it has
1502 // one or it allocates a new JvmtiThreadState for the JavaThread and
1503 // returns it. JvmtiThreadState::state_for() will return NULL only if
1504 // the specified JavaThread is exiting.
1505 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1506 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1507
1508 // JVMTI PopFrame support
1509 // Setting and clearing popframe_condition
1510 // All of these enumerated values are bits. popframe_pending
1511 // indicates that a PopFrame() has been requested and not yet been
1512 // completed. popframe_processing indicates that that PopFrame() is in
1513 // the process of being completed. popframe_force_deopt_reexecution_bit
1514 // indicates that special handling is required when returning to a
1515 // deoptimized caller.
1516 enum PopCondition {
1517 popframe_inactive = 0x00,
1518 popframe_pending_bit = 0x01,
1519 popframe_processing_bit = 0x02,
1520 popframe_force_deopt_reexecution_bit = 0x04
1521 };
1522 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1523 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1524 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1525 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1526 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1527 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1528 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1529 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1530
1531 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1532 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1533 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1534
1535 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1536 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1537 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1538
1539 private:
1540 // Saved incoming arguments to popped frame.
1541 // Used only when popped interpreted frame returns to deoptimized frame.
1542 void* _popframe_preserved_args;
1543 int _popframe_preserved_args_size;
1544
1545 public:
1546 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1547 void* popframe_preserved_args();
1548 ByteSize popframe_preserved_args_size();
1549 WordSize popframe_preserved_args_size_in_words();
1550 void popframe_free_preserved_args();
1551
1552
1553 private:
1554 JvmtiThreadState *_jvmti_thread_state;
1555
1556 // Used by the interpreter in fullspeed mode for frame pop, method
1557 // entry, method exit and single stepping support. This field is
1558 // only set to non-zero at a safepoint or using a direct handshake
1559 // (see EnterInterpOnlyModeClosure).
1560 // It can be set to zero asynchronously to this threads execution (i.e., without
1561 // safepoint/handshake or a lock) so we have to be very careful.
1562 // Accesses by other threads are synchronized using JvmtiThreadState_lock though.
1563 int _interp_only_mode;
1564
1565 public:
1566 // used by the interpreter for fullspeed debugging support (see above)
1567 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1568 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1569 int get_interp_only_mode() { return _interp_only_mode; }
1570 void increment_interp_only_mode() { ++_interp_only_mode; }
1571 void decrement_interp_only_mode() { --_interp_only_mode; }
1572
1573 // support for cached flag that indicates whether exceptions need to be posted for this thread
1574 // if this is false, we can avoid deoptimizing when events are thrown
1575 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1576 private:
1577 int _should_post_on_exceptions_flag;
1578
1579 public:
1580 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1581 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1582
1583 private:
1584 ThreadStatistics *_thread_stat;
1585
1586 public:
1587 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1588
1589 // Return a blocker object for which this thread is blocked parking.
1590 oop current_park_blocker();
1591
1592 private:
1593 static size_t _stack_size_at_create;
1594
1595 public:
1596 static inline size_t stack_size_at_create(void) {
1597 return _stack_size_at_create;
1598 }
1599 static inline void set_stack_size_at_create(size_t value) {
1600 _stack_size_at_create = value;
1601 }
1602
1603 // Machine dependent stuff
1604 #include OS_CPU_HEADER(thread)
1605
1606 // JSR166 per-thread parker
1607 private:
1608 Parker _parker;
1609 public:
1610 Parker* parker() { return &_parker; }
1611
1612 // Biased locking support
1613 private:
1614 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1615 public:
1616 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1617 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1618
1619 // clearing/querying jni attach status
1620 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1621 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1622 inline void set_done_attaching_via_jni();
1623
1624 // Stack dump assistance:
1625 // Track the class we want to initialize but for which we have to wait
1626 // on its init_lock() because it is already being initialized.
1627 void set_class_to_be_initialized(InstanceKlass* k);
1628 InstanceKlass* class_to_be_initialized() const;
1629
1630 private:
1631 InstanceKlass* _class_to_be_initialized;
1632
1633 // java.lang.Thread.sleep support
1634 ParkEvent * _SleepEvent;
1635 public:
1636 bool sleep(jlong millis);
1637
1638 // java.lang.Thread interruption support
1639 void interrupt();
1640 bool is_interrupted(bool clear_interrupted);
1641
1642 static OopStorage* thread_oop_storage();
1643
1644 static void verify_cross_modify_fence_failure(JavaThread *thread) PRODUCT_RETURN;
1645
1646 // Helper function to start a VM-internal daemon thread.
1647 // E.g. ServiceThread, NotificationThread, CompilerThread etc.
1648 static void start_internal_daemon(JavaThread* current, JavaThread* target,
1649 Handle thread_oop, ThreadPriority prio);
1650
1651 // Helper function to do vm_exit_on_initialization for osthread
1652 // resource allocation failure.
1653 static void vm_exit_on_osthread_failure(JavaThread* thread);
1654
1655 // AsyncGetCallTrace support
1656 inline bool in_asgct(void) {return _in_asgct;}
1657 inline void set_in_asgct(bool value) {_in_asgct = value;}
1658 };
1659
1660 // Inline implementation of JavaThread::current
1661 inline JavaThread* JavaThread::current() {
1662 return Thread::current()->as_Java_thread();
1663 }
1664
1665 inline JavaThread* JavaThread::current_or_null() {
1666 Thread* current = Thread::current_or_null();
1667 return current != nullptr ? current->as_Java_thread() : nullptr;
1668 }
1669
1670 inline JavaThread* Thread::as_Java_thread() {
1671 assert(is_Java_thread(), "incorrect cast to JavaThread");
1672 return static_cast<JavaThread*>(this);
1673 }
1674
1675 inline const JavaThread* Thread::as_Java_thread() const {
1676 assert(is_Java_thread(), "incorrect cast to const JavaThread");
1677 return static_cast<const JavaThread*>(this);
1678 }
1679
1680 // The active thread queue. It also keeps track of the current used
1681 // thread priorities.
1682 class Threads: AllStatic {
1683 friend class VMStructs;
1684 private:
1685 static int _number_of_threads;
1686 static int _number_of_non_daemon_threads;
1687 static int _return_code;
1688 static uintx _thread_claim_token;
1689 #ifdef ASSERT
1690 static bool _vm_complete;
1691 #endif
1692
1693 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
1694 static void initialize_jsr292_core_classes(TRAPS);
1695
1696 public:
1697 // Thread management
1698 // force_daemon is a concession to JNI, where we may need to add a
1699 // thread to the thread list before allocating its thread object
1700 static void add(JavaThread* p, bool force_daemon = false);
1701 static void remove(JavaThread* p, bool is_daemon);
1702 static void non_java_threads_do(ThreadClosure* tc);
1703 static void java_threads_do(ThreadClosure* tc);
1704 static void java_threads_and_vm_thread_do(ThreadClosure* tc);
1705 static void threads_do(ThreadClosure* tc);
1706 static void possibly_parallel_threads_do(bool is_par, ThreadClosure* tc);
1707
1708 // Initializes the vm and creates the vm thread
1709 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1710 static void convert_vm_init_libraries_to_agents();
1711 static void create_vm_init_libraries();
1712 static void create_vm_init_agents();
1713 static void shutdown_vm_agents();
1714 static void destroy_vm();
1715 // Supported VM versions via JNI
1716 // Includes JNI_VERSION_1_1
1717 static jboolean is_supported_jni_version_including_1_1(jint version);
1718 // Does not include JNI_VERSION_1_1
1719 static jboolean is_supported_jni_version(jint version);
1720
1721 // The "thread claim token" provides a way for threads to be claimed
1722 // by parallel worker tasks.
1723 //
1724 // Each thread contains a "token" field. A task will claim the
1725 // thread only if its token is different from the global token,
1726 // which is updated by calling change_thread_claim_token(). When
1727 // a thread is claimed, it's token is set to the global token value
1728 // so other threads in the same iteration pass won't claim it.
1729 //
1730 // For this to work change_thread_claim_token() needs to be called
1731 // exactly once in sequential code before starting parallel tasks
1732 // that should claim threads.
1733 //
1734 // New threads get their token set to 0 and change_thread_claim_token()
1735 // never sets the global token to 0.
1736 static uintx thread_claim_token() { return _thread_claim_token; }
1737 static void change_thread_claim_token();
1738 static void assert_all_threads_claimed() NOT_DEBUG_RETURN;
1739
1740 // Apply "f->do_oop" to all root oops in all threads.
1741 // This version may only be called by sequential code.
1742 static void oops_do(OopClosure* f, CodeBlobClosure* cf);
1743 // This version may be called by sequential or parallel code.
1744 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf);
1745
1746 // RedefineClasses support
1747 static void metadata_do(MetadataClosure* f);
1748 static void metadata_handles_do(void f(Metadata*));
1749
1750 #ifdef ASSERT
1751 static bool is_vm_complete() { return _vm_complete; }
1752 #endif // ASSERT
1753
1754 // Verification
1755 static void verify();
1756 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks, bool print_extended_info);
1757 static void print(bool print_stacks, bool internal_format) {
1758 // this function is only used by debug.cpp
1759 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */, false /* simple format */);
1760 }
1761 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1762 static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf,
1763 int buflen, bool* found_current);
1764 static void print_threads_compiling(outputStream* st, char* buf, int buflen, bool short_form = false);
1765
1766 // Get Java threads that are waiting to enter a monitor.
1767 static GrowableArray<JavaThread*>* get_pending_threads(ThreadsList * t_list,
1768 int count, address monitor);
1769
1770 // Get owning Java thread from the monitor's owner field.
1771 static JavaThread *owning_thread_from_monitor_owner(ThreadsList * t_list,
1772 address owner);
1773
1774 // Number of threads on the active threads list
1775 static int number_of_threads() { return _number_of_threads; }
1776 // Number of non-daemon threads on the active threads list
1777 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1778
1779 // Deoptimizes all frames tied to marked nmethods
1780 static void deoptimized_wrt_marked_nmethods();
1781
1782 struct Test; // For private gtest access.
1783 };
1784
1785 class UnlockFlagSaver {
1786 private:
1787 JavaThread* _thread;
1788 bool _do_not_unlock;
1789 public:
1790 UnlockFlagSaver(JavaThread* t) {
1791 _thread = t;
1792 _do_not_unlock = t->do_not_unlock_if_synchronized();
1793 t->set_do_not_unlock_if_synchronized(false);
1794 }
1795 ~UnlockFlagSaver() {
1796 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
1797 }
1798 };
1799
1800 #endif // SHARE_RUNTIME_THREAD_HPP