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