1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP
26 #define SHARE_VM_RUNTIME_THREAD_HPP
27
28 #include "memory/allocation.hpp"
29 #include "memory/threadLocalAllocBuffer.hpp"
30 #include "oops/oop.hpp"
31 #include "prims/jni.h"
32 #include "prims/jvmtiExport.hpp"
33 #include "runtime/frame.hpp"
34 #include "runtime/javaFrameAnchor.hpp"
35 #include "runtime/jniHandles.hpp"
36 #include "runtime/mutexLocker.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/osThread.hpp"
39 #include "runtime/park.hpp"
40 #include "runtime/safepoint.hpp"
41 #include "runtime/stubRoutines.hpp"
42 #include "runtime/threadLocalStorage.hpp"
43 #include "runtime/thread_ext.hpp"
44 #include "runtime/unhandledOops.hpp"
45 #include "utilities/exceptions.hpp"
46 #include "utilities/macros.hpp"
47 #include "utilities/top.hpp"
48 #if INCLUDE_ALL_GCS
49 #include "gc_implementation/g1/dirtyCardQueue.hpp"
50 #include "gc_implementation/g1/satbQueue.hpp"
51 #endif // INCLUDE_ALL_GCS
52 #ifdef TARGET_ARCH_zero
53 # include "stack_zero.hpp"
54 #endif
55 #if INCLUDE_JFR
56 #include "jfr/support/jfrThreadExtension.hpp"
57 #endif
58
59 class ThreadSafepointState;
60 class ThreadProfiler;
61
62 class JvmtiThreadState;
63 class JvmtiGetLoadedClassesClosure;
64 class ThreadStatistics;
65 class ConcurrentLocksDump;
66 class ParkEvent;
67 class Parker;
68
69 class ciEnv;
70 class CompileThread;
71 class CompileLog;
72 class CompileTask;
73 class CompileQueue;
74 class CompilerCounters;
75 class vframeArray;
76
77 class DeoptResourceMark;
78 class jvmtiDeferredLocalVariableSet;
79
80 class GCTaskQueue;
81 class ThreadClosure;
82 class IdealGraphPrinter;
83
84 class Metadata;
85 template <class T, MEMFLAGS F> class ChunkedList;
86 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
87
88 DEBUG_ONLY(class ResourceMark;)
89
90 class WorkerThread;
91
92 // Class hierarchy
93 // - Thread
94 // - NamedThread
95 // - VMThread
96 // - ConcurrentGCThread
97 // - WorkerThread
98 // - GangWorker
99 // - GCTaskThread
100 // - JavaThread
101 // - WatcherThread
102
103 class Thread: public ThreadShadow {
104 friend class VMStructs;
105
106 #if INCLUDE_ALL_GCS
107 protected:
108 // Support for Shenandoah barriers. This is only accessible from JavaThread,
109 // but we really want to keep this field at lower Thread offset (below first
110 // 128 bytes), because that makes barrier fastpaths optimally encoded.
111 char _gc_state;
112 static char _gc_state_global;
113 #endif
114
115 private:
116 // Exception handling
117 // (Note: _pending_exception and friends are in ThreadShadow)
118 //oop _pending_exception; // pending exception for current thread
119 // const char* _exception_file; // file information for exception (debugging only)
120 // int _exception_line; // line information for exception (debugging only)
121 protected:
122 // Support for forcing alignment of thread objects for biased locking
123 void* _real_malloc_address;
124 public:
125 void* operator new(size_t size) throw() { return allocate(size, true); }
126 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
127 return allocate(size, false); }
128 void operator delete(void* p);
129
130 protected:
131 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
132 private:
133
134 // ***************************************************************
135 // Suspend and resume support
136 // ***************************************************************
137 //
138 // VM suspend/resume no longer exists - it was once used for various
139 // things including safepoints but was deprecated and finally removed
140 // in Java 7. Because VM suspension was considered "internal" Java-level
141 // suspension was considered "external", and this legacy naming scheme
142 // remains.
143 //
144 // External suspend/resume requests come from JVM_SuspendThread,
145 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
146 // ResumeThread. External
147 // suspend requests cause _external_suspend to be set and external
148 // resume requests cause _external_suspend to be cleared.
149 // External suspend requests do not nest on top of other external
150 // suspend requests. The higher level APIs reject suspend requests
151 // for already suspended threads.
152 //
153 // The external_suspend
154 // flag is checked by has_special_runtime_exit_condition() and java thread
155 // will self-suspend when handle_special_runtime_exit_condition() is
156 // called. Most uses of the _thread_blocked state in JavaThreads are
157 // considered the same as being externally suspended; if the blocking
158 // condition lifts, the JavaThread will self-suspend. Other places
159 // where VM checks for external_suspend include:
160 // + mutex granting (do not enter monitors when thread is suspended)
161 // + state transitions from _thread_in_native
162 //
163 // In general, java_suspend() does not wait for an external suspend
164 // request to complete. When it returns, the only guarantee is that
165 // the _external_suspend field is true.
166 //
167 // wait_for_ext_suspend_completion() is used to wait for an external
168 // suspend request to complete. External suspend requests are usually
169 // followed by some other interface call that requires the thread to
170 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
171 // the interface that requires quiescence, we give the JavaThread a
172 // chance to self-suspend before we need it to be quiescent. This
173 // improves overall suspend/query performance.
174 //
175 // _suspend_flags controls the behavior of java_ suspend/resume.
176 // It must be set under the protection of SR_lock. Read from the flag is
177 // OK without SR_lock as long as the value is only used as a hint.
178 // (e.g., check _external_suspend first without lock and then recheck
179 // inside SR_lock and finish the suspension)
180 //
181 // _suspend_flags is also overloaded for other "special conditions" so
182 // that a single check indicates whether any special action is needed
183 // eg. for async exceptions.
184 // -------------------------------------------------------------------
185 // Notes:
186 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
187 // but we still update its value to keep other part of the system (mainly
188 // JVMTI) happy. ThreadState is legacy code (see notes in
189 // osThread.hpp).
190 //
191 // 2. It would be more natural if set_external_suspend() is private and
192 // part of java_suspend(), but that probably would affect the suspend/query
193 // performance. Need more investigation on this.
194 //
195
196 // suspend/resume lock: used for self-suspend
197 Monitor* _SR_lock;
198
199 protected:
200 enum SuspendFlags {
201 // NOTE: avoid using the sign-bit as cc generates different test code
202 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
203
204 _external_suspend = 0x20000000U, // thread is asked to self suspend
205 _ext_suspended = 0x40000000U, // thread has self-suspended
206 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
207
208 _has_async_exception = 0x00000001U, // there is a pending async exception
209 _critical_native_unlock = 0x00000002U, // Must call back to unlock JNI critical lock
210
211 JFR_ONLY(_trace_flag = 0x00000004U) // call jfr tracing
212 };
213
214 // various suspension related flags - atomically updated
215 // overloaded for async exception checking in check_special_condition_for_native_trans.
216 volatile uint32_t _suspend_flags;
217
218 private:
219 int _num_nested_signal;
220
221 public:
222 void enter_signal_handler() { _num_nested_signal++; }
223 void leave_signal_handler() { _num_nested_signal--; }
224 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
225
226 private:
227 // Debug tracing
228 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
229
230 // Active_handles points to a block of handles
231 JNIHandleBlock* _active_handles;
232
233 // One-element thread local free list
234 JNIHandleBlock* _free_handle_block;
235
236 // Point to the last handle mark
237 HandleMark* _last_handle_mark;
238
239 // The parity of the last strong_roots iteration in which this thread was
240 // claimed as a task.
241 jint _oops_do_parity;
242
243 public:
244 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
245 HandleMark* last_handle_mark() const { return _last_handle_mark; }
246 private:
247
248 // debug support for checking if code does allow safepoints or not
249 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
250 // mutex, or blocking on an object synchronizer (Java locking).
251 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
252 // If !allow_allocation(), then an assertion failure will happen during allocation
253 // (Hence, !allow_safepoint() => !allow_allocation()).
254 //
255 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
256 //
257 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
258 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
259
260 // Used by SkipGCALot class.
261 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
262
263 friend class No_Alloc_Verifier;
264 friend class No_Safepoint_Verifier;
265 friend class Pause_No_Safepoint_Verifier;
266 friend class ThreadLocalStorage;
267 friend class GC_locker;
268
269 ThreadLocalAllocBuffer _tlab; // Thread-local eden
270 ThreadLocalAllocBuffer _gclab; // Thread-local allocation buffer for GC (e.g. evacuation)
271 uint _worker_id; // Worker ID
272 bool _force_satb_flush; // Force SATB flush
273 double _paced_time; // Accumulated paced time
274
275 jlong _allocated_bytes; // Cumulative number of bytes allocated on
276 // the Java heap
277 jlong _allocated_bytes_gclab; // Cumulative number of bytes allocated on
278 // the Java heap, in GCLABs
279
280 // Thread-local buffer used by MetadataOnStackMark.
281 MetadataOnStackBuffer* _metadata_on_stack_buffer;
282
283 JFR_ONLY(DEFINE_THREAD_LOCAL_FIELD_JFR;) // Thread-local data for jfr
284
285 ThreadExt _ext;
286
287 int _vm_operation_started_count; // VM_Operation support
288 int _vm_operation_completed_count; // VM_Operation support
289
290 char _oom_during_evac;
291
292 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
293 // is waiting to lock
294 bool _current_pending_monitor_is_from_java; // locking is from Java code
295
296 // ObjectMonitor on which this thread called Object.wait()
297 ObjectMonitor* _current_waiting_monitor;
298
299 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
300 public:
301 ObjectMonitor* omFreeList;
302 int omFreeCount; // length of omFreeList
303 int omFreeProvision; // reload chunk size
304 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
305 int omInUseCount; // length of omInUseList
306
307 #ifdef ASSERT
308 private:
309 bool _visited_for_critical_count;
310
311 public:
312 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
313 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
314 #endif
315
316 public:
317 enum {
318 is_definitely_current_thread = true
319 };
320
321 // Constructor
322 Thread();
323 virtual ~Thread();
324
325 // initializtion
326 void initialize_thread_local_storage();
327
328 // thread entry point
329 virtual void 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_hidden_from_external_view() const { return false; }
336 virtual bool is_jvmti_agent_thread() const { return false; }
337 // True iff the thread can perform GC operations at a safepoint.
338 // Generally will be true only of VM thread and parallel GC WorkGang
339 // threads.
340 virtual bool is_GC_task_thread() const { return false; }
341 virtual bool is_Watcher_thread() const { return false; }
342 virtual bool is_ConcurrentGC_thread() const { return false; }
343 virtual bool is_Named_thread() const { return false; }
344 virtual bool is_Worker_thread() const { return false; }
345
346 // Casts
347 virtual WorkerThread* as_Worker_thread() const { return NULL; }
348
349 virtual char* name() const { return (char*)"Unknown thread"; }
350
351 // Returns the current thread
352 static inline Thread* current();
353
354 // Common thread operations
355 static void set_priority(Thread* thread, ThreadPriority priority);
356 static ThreadPriority get_priority(const Thread* const thread);
357 static void start(Thread* thread);
358 static void interrupt(Thread* thr);
359 static bool is_interrupted(Thread* thr, bool clear_interrupted);
360
361 void set_native_thread_name(const char *name) {
362 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
363 os::set_native_thread_name(name);
364 }
365
366 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
367 Monitor* SR_lock() const { return _SR_lock; }
368
369 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
370
371 void set_suspend_flag(SuspendFlags f) {
372 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
373 uint32_t flags;
374 do {
375 flags = _suspend_flags;
376 }
377 while (Atomic::cmpxchg((jint)(flags | f),
378 (volatile jint*)&_suspend_flags,
379 (jint)flags) != (jint)flags);
380 }
381 void clear_suspend_flag(SuspendFlags f) {
382 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
383 uint32_t flags;
384 do {
385 flags = _suspend_flags;
386 }
387 while (Atomic::cmpxchg((jint)(flags & ~f),
388 (volatile jint*)&_suspend_flags,
389 (jint)flags) != (jint)flags);
390 }
391
392 void set_has_async_exception() {
393 set_suspend_flag(_has_async_exception);
394 }
395 void clear_has_async_exception() {
396 clear_suspend_flag(_has_async_exception);
397 }
398
399 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
400
401 void set_critical_native_unlock() {
402 set_suspend_flag(_critical_native_unlock);
403 }
404 void clear_critical_native_unlock() {
405 clear_suspend_flag(_critical_native_unlock);
406 }
407
408 bool is_oom_during_evac() const;
409 void set_oom_during_evac(bool oom);
410
411 #ifdef ASSERT
412 bool is_evac_allowed() const;
413 void set_evac_allowed(bool evac_allowed);
414 #endif
415
416 // Support for Unhandled Oop detection
417 #ifdef CHECK_UNHANDLED_OOPS
418 private:
419 UnhandledOops* _unhandled_oops;
420 public:
421 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
422 // Mark oop safe for gc. It may be stack allocated but won't move.
423 void allow_unhandled_oop(oop *op) {
424 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
425 }
426 // Clear oops at safepoint so crashes point to unhandled oop violator
427 void clear_unhandled_oops() {
428 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
429 }
430 #endif // CHECK_UNHANDLED_OOPS
431
432 #ifndef PRODUCT
433 bool skip_gcalot() { return _skip_gcalot; }
434 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
435 #endif
436
437 public:
438 // Installs a pending exception to be inserted later
439 static void send_async_exception(oop thread_oop, oop java_throwable);
440
441 // Resource area
442 ResourceArea* resource_area() const { return _resource_area; }
443 void set_resource_area(ResourceArea* area) { _resource_area = area; }
444
445 OSThread* osthread() const { return _osthread; }
446 void set_osthread(OSThread* thread) { _osthread = thread; }
447
448 // JNI handle support
449 JNIHandleBlock* active_handles() const { return _active_handles; }
450 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
451 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
452 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
453
454 // Internal handle support
455 HandleArea* handle_area() const { return _handle_area; }
456 void set_handle_area(HandleArea* area) { _handle_area = area; }
457
458 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
459 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
460
461 // Thread-Local Allocation Buffer (TLAB) support
462 ThreadLocalAllocBuffer& tlab() { return _tlab; }
463 void initialize_tlab() {
464 if (UseTLAB) {
465 tlab().initialize(false);
466 if (UseShenandoahGC && (is_Java_thread() || is_Worker_thread())) {
467 gclab().initialize(true);
468 }
469 }
470 }
471
472 // Thread-Local GC Allocation Buffer (GCLAB) support
473 ThreadLocalAllocBuffer& gclab() {
474 assert (UseShenandoahGC, "Only for Shenandoah");
475 assert (!_gclab.is_initialized() || (is_Java_thread() || is_Worker_thread()),
476 "Only Java and GC worker threads are allowed to get GCLABs");
477 return _gclab;
478 }
479
480 void set_worker_id(uint id) { _worker_id = id; }
481 uint worker_id() { return _worker_id; }
482
483 void set_force_satb_flush(bool value) { _force_satb_flush = value; }
484 bool is_force_satb_flush() { return _force_satb_flush; }
485
486 void add_paced_time(double v) { _paced_time += v; }
487 double paced_time() { return _paced_time; }
488 void reset_paced_time() { _paced_time = 0; }
489
490 jlong allocated_bytes() { return _allocated_bytes; }
491 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
492 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
493 inline jlong cooked_allocated_bytes();
494
495 jlong allocated_bytes_gclab() { return _allocated_bytes_gclab; }
496 void set_allocated_bytes_gclab(jlong value) { _allocated_bytes_gclab = value; }
497 void incr_allocated_bytes_gclab(jlong size) { _allocated_bytes_gclab += size; }
498
499 JFR_ONLY(DEFINE_THREAD_LOCAL_ACCESSOR_JFR;)
500 JFR_ONLY(DEFINE_TRACE_SUSPEND_FLAG_METHODS)
501
502 const ThreadExt& ext() const { return _ext; }
503 ThreadExt& ext() { return _ext; }
504
505 // VM operation support
506 int vm_operation_ticket() { return ++_vm_operation_started_count; }
507 int vm_operation_completed_count() { return _vm_operation_completed_count; }
508 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
509
510 // For tracking the heavyweight monitor the thread is pending on.
511 ObjectMonitor* current_pending_monitor() {
512 return _current_pending_monitor;
513 }
514 void set_current_pending_monitor(ObjectMonitor* monitor) {
515 _current_pending_monitor = monitor;
516 }
517 void set_current_pending_monitor_is_from_java(bool from_java) {
518 _current_pending_monitor_is_from_java = from_java;
519 }
520 bool current_pending_monitor_is_from_java() {
521 return _current_pending_monitor_is_from_java;
522 }
523
524 // For tracking the ObjectMonitor on which this thread called Object.wait()
525 ObjectMonitor* current_waiting_monitor() {
526 return _current_waiting_monitor;
527 }
528 void set_current_waiting_monitor(ObjectMonitor* monitor) {
529 _current_waiting_monitor = monitor;
530 }
531
532 // GC support
533 // Apply "f->do_oop" to all root oops in "this".
534 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
535 // Used by JavaThread::oops_do.
536 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
537 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
538
539 // Handles the parallel case for the method below.
540 private:
541 bool claim_oops_do_par_case(int collection_parity);
542 public:
543 // Requires that "collection_parity" is that of the current roots
544 // iteration. If "is_par" is false, sets the parity of "this" to
545 // "collection_parity", and returns "true". If "is_par" is true,
546 // uses an atomic instruction to set the current threads parity to
547 // "collection_parity", if it is not already. Returns "true" iff the
548 // calling thread does the update, this indicates that the calling thread
549 // has claimed the thread's stack as a root groop in the current
550 // collection.
551 bool claim_oops_do(bool is_par, int collection_parity) {
552 if (!is_par) {
553 _oops_do_parity = collection_parity;
554 return true;
555 } else {
556 return claim_oops_do_par_case(collection_parity);
557 }
558 }
559
560 // Sweeper support
561 void nmethods_do(CodeBlobClosure* cf);
562
563 // jvmtiRedefineClasses support
564 void metadata_do(void f(Metadata*));
565
566 // Used by fast lock support
567 virtual bool is_lock_owned(address adr) const;
568
569 // Check if address is in the stack of the thread (not just for locks).
570 // Warning: the method can only be used on the running thread
571 bool is_in_stack(address adr) const;
572 // Check if address is in the usable part of the stack (excludes protected
573 // guard pages)
574 bool is_in_usable_stack(address adr) const;
575
576 // Sets this thread as starting thread. Returns failure if thread
577 // creation fails due to lack of memory, too many threads etc.
578 bool set_as_starting_thread();
579
580 void set_metadata_on_stack_buffer(MetadataOnStackBuffer* buffer) { _metadata_on_stack_buffer = buffer; }
581 MetadataOnStackBuffer* metadata_on_stack_buffer() const { return _metadata_on_stack_buffer; }
582
583 protected:
584 // OS data associated with the thread
585 OSThread* _osthread; // Platform-specific thread information
586
587 // Thread local resource area for temporary allocation within the VM
588 ResourceArea* _resource_area;
589
590 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
591
592 // Thread local handle area for allocation of handles within the VM
593 HandleArea* _handle_area;
594 GrowableArray<Metadata*>* _metadata_handles;
595
596 // Support for stack overflow handling, get_thread, etc.
597 address _stack_base;
598 size_t _stack_size;
599 uintptr_t _self_raw_id; // used by get_thread (mutable)
600 int _lgrp_id;
601
602 public:
603 // Stack overflow support
604 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
605
606 void set_stack_base(address base) { _stack_base = base; }
607 size_t stack_size() const { return _stack_size; }
608 void set_stack_size(size_t size) { _stack_size = size; }
609 void record_stack_base_and_size();
610
611 bool on_local_stack(address adr) const {
612 /* QQQ this has knowledge of direction, ought to be a stack method */
613 return (_stack_base > adr && adr >= (_stack_base - _stack_size));
614 }
615
616 uintptr_t self_raw_id() { return _self_raw_id; }
617 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
618
619 int lgrp_id() const { return _lgrp_id; }
620 void set_lgrp_id(int value) { _lgrp_id = value; }
621
622 // Printing
623 void print_on(outputStream* st) const;
624 void print() const { print_on(tty); }
625 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
626
627 // Debug-only code
628 #ifdef ASSERT
629 private:
630 // Deadlock detection support for Mutex locks. List of locks own by thread.
631 Monitor* _owned_locks;
632 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
633 // thus the friendship
634 friend class Mutex;
635 friend class Monitor;
636
637 public:
638 void print_owned_locks_on(outputStream* st) const;
639 void print_owned_locks() const { print_owned_locks_on(tty); }
640 Monitor* owned_locks() const { return _owned_locks; }
641 bool owns_locks() const { return owned_locks() != NULL; }
642 bool owns_locks_but_compiled_lock() const;
643
644 // Deadlock detection
645 bool allow_allocation() { return _allow_allocation_count == 0; }
646 ResourceMark* current_resource_mark() { return _current_resource_mark; }
647 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
648 #endif
649
650 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
651
652 private:
653 volatile int _jvmti_env_iteration_count;
654
655 public:
656 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
657 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
658 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
659
660 // Code generation
661 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
662 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
663 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
664
665 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
666 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
667
668 #define TLAB_FIELD_OFFSET(name) \
669 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
670
671 TLAB_FIELD_OFFSET(start)
672 TLAB_FIELD_OFFSET(end)
673 TLAB_FIELD_OFFSET(top)
674 TLAB_FIELD_OFFSET(pf_top)
675 TLAB_FIELD_OFFSET(size) // desired_size
676 TLAB_FIELD_OFFSET(refill_waste_limit)
677 TLAB_FIELD_OFFSET(number_of_refills)
678 TLAB_FIELD_OFFSET(fast_refill_waste)
679 TLAB_FIELD_OFFSET(slow_allocations)
680
681 #undef TLAB_FIELD_OFFSET
682
683 static ByteSize gclab_start_offset() { return byte_offset_of(Thread, _gclab) + ThreadLocalAllocBuffer::start_offset(); }
684 static ByteSize gclab_top_offset() { return byte_offset_of(Thread, _gclab) + ThreadLocalAllocBuffer::top_offset(); }
685 static ByteSize gclab_end_offset() { return byte_offset_of(Thread, _gclab) + ThreadLocalAllocBuffer::end_offset(); }
686
687 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
688
689 JFR_ONLY(DEFINE_THREAD_LOCAL_OFFSET_JFR;)
690
691 public:
692 volatile intptr_t _Stalled ;
693 volatile int _TypeTag ;
694 ParkEvent * _ParkEvent ; // for synchronized()
695 ParkEvent * _SleepEvent ; // for Thread.sleep
696 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
697 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
698 int NativeSyncRecursion ; // diagnostic
699
700 volatile int _OnTrap ; // Resume-at IP delta
701 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
702 jint _hashStateX ; // thread-specific hashCode generator state
703 jint _hashStateY ;
704 jint _hashStateZ ;
705 void * _schedctl ;
706
707
708 volatile jint rng [4] ; // RNG for spin loop
709
710 // Low-level leaf-lock primitives used to implement synchronization
711 // and native monitor-mutex infrastructure.
712 // Not for general synchronization use.
713 static void SpinAcquire (volatile int * Lock, const char * Name) ;
714 static void SpinRelease (volatile int * Lock) ;
715 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
716 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
717 static void muxRelease (volatile intptr_t * Lock) ;
718 };
719
720 // Inline implementation of Thread::current()
721 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
722 // startup.
723 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
724 // period. This is inlined in thread_<os_family>.inline.hpp.
725
726 inline Thread* Thread::current() {
727 #ifdef ASSERT
728 // This function is very high traffic. Define PARANOID to enable expensive
729 // asserts.
730 #ifdef PARANOID
731 // Signal handler should call ThreadLocalStorage::get_thread_slow()
732 Thread* t = ThreadLocalStorage::get_thread_slow();
733 assert(t != NULL && !t->is_inside_signal_handler(),
734 "Don't use Thread::current() inside signal handler");
735 #endif
736 #endif
737 Thread* thread = ThreadLocalStorage::thread();
738 assert(thread != NULL, "just checking");
739 return thread;
740 }
741
742 // Name support for threads. non-JavaThread subclasses with multiple
743 // uniquely named instances should derive from this.
744 class NamedThread: public Thread {
745 friend class VMStructs;
746 enum {
747 max_name_len = 64
748 };
749 private:
750 char* _name;
751 // log JavaThread being processed by oops_do
752 JavaThread* _processed_thread;
753
754 public:
755 NamedThread();
756 ~NamedThread();
757 // May only be called once per thread.
758 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
759 virtual bool is_Named_thread() const { return true; }
760 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
761 JavaThread *processed_thread() { return _processed_thread; }
762 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
763 };
764
765 // Worker threads are named and have an id of an assigned work.
766 class WorkerThread: public NamedThread {
767 private:
768 uint _id;
769 public:
770 WorkerThread() : _id(0) { }
771 virtual bool is_Worker_thread() const { return true; }
772
773 virtual WorkerThread* as_Worker_thread() const {
774 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
775 return (WorkerThread*) this;
776 }
777
778 void set_id(uint work_id) { _id = work_id; }
779 uint id() const { return _id; }
780 };
781
782 // A single WatcherThread is used for simulating timer interrupts.
783 class WatcherThread: public Thread {
784 friend class VMStructs;
785 public:
786 virtual void run();
787
788 private:
789 static WatcherThread* _watcher_thread;
790
791 static bool _startable;
792 volatile static bool _should_terminate; // updated without holding lock
793 public:
794 enum SomeConstants {
795 delay_interval = 10 // interrupt delay in milliseconds
796 };
797
798 // Constructor
799 WatcherThread();
800
801 // Tester
802 bool is_Watcher_thread() const { return true; }
803
804 // Printing
805 char* name() const { return (char*)"VM Periodic Task Thread"; }
806 void print_on(outputStream* st) const;
807 void print() const { print_on(tty); }
808 void unpark();
809
810 // Returns the single instance of WatcherThread
811 static WatcherThread* watcher_thread() { return _watcher_thread; }
812
813 // Create and start the single instance of WatcherThread, or stop it on shutdown
814 static void start();
815 static void stop();
816 // Only allow start once the VM is sufficiently initialized
817 // Otherwise the first task to enroll will trigger the start
818 static void make_startable();
819 private:
820 int sleep() const;
821 };
822
823
824 class CompilerThread;
825
826 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
827
828 class JavaThread: public Thread {
829 friend class VMStructs;
830 private:
831 JavaThread* _next; // The next thread in the Threads list
832 oop _threadObj; // The Java level thread object
833
834 #ifdef ASSERT
835 private:
836 int _java_call_counter;
837
838 public:
839 int java_call_counter() { return _java_call_counter; }
840 void inc_java_call_counter() { _java_call_counter++; }
841 void dec_java_call_counter() {
842 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
843 _java_call_counter--;
844 }
845 private: // restore original namespace restriction
846 #endif // ifdef ASSERT
847
848 #ifndef PRODUCT
849 public:
850 enum {
851 jump_ring_buffer_size = 16
852 };
853 private: // restore original namespace restriction
854 #endif
855
856 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
857
858 ThreadFunction _entry_point;
859
860 JNIEnv _jni_environment;
861
862 // Deopt support
863 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
864
865 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
866 // transition out of native
867 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
868 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
869 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
870 // Because deoptimization is lazy we must save jvmti requests to set locals
871 // in compiled frames until we deoptimize and we have an interpreter frame.
872 // This holds the pointer to array (yeah like there might be more than one) of
873 // description of compiled vframes that have locals that need to be updated.
874 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
875
876 // Handshake value for fixing 6243940. We need a place for the i2c
877 // adapter to store the callee Method*. This value is NEVER live
878 // across a gc point so it does NOT have to be gc'd
879 // The handshake is open ended since we can't be certain that it will
880 // be NULLed. This is because we rarely ever see the race and end up
881 // in handle_wrong_method which is the backend of the handshake. See
882 // code in i2c adapters and handle_wrong_method.
883
884 Method* _callee_target;
885
886 // Used to pass back results to the interpreter or generated code running Java code.
887 oop _vm_result; // oop result is GC-preserved
888 Metadata* _vm_result_2; // non-oop result
889
890 // See ReduceInitialCardMarks: this holds the precise space interval of
891 // the most recent slow path allocation for which compiled code has
892 // elided card-marks for performance along the fast-path.
893 MemRegion _deferred_card_mark;
894
895 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
896 // allocated during deoptimization
897 // and by JNI_MonitorEnter/Exit
898
899 // Async. requests support
900 enum AsyncRequests {
901 _no_async_condition = 0,
902 _async_exception,
903 _async_unsafe_access_error
904 };
905 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
906 oop _pending_async_exception;
907
908 // Safepoint support
909 public: // Expose _thread_state for SafeFetchInt()
910 volatile JavaThreadState _thread_state;
911 private:
912 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
913 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
914
915 // JavaThread termination support
916 enum TerminatedTypes {
917 _not_terminated = 0xDEAD - 2,
918 _thread_exiting, // JavaThread::exit() has been called for this thread
919 _thread_terminated, // JavaThread is removed from thread list
920 _vm_exited // JavaThread is still executing native code, but VM is terminated
921 // only VM_Exit can set _vm_exited
922 };
923
924 // In general a JavaThread's _terminated field transitions as follows:
925 //
926 // _not_terminated => _thread_exiting => _thread_terminated
927 //
928 // _vm_exited is a special value to cover the case of a JavaThread
929 // executing native code after the VM itself is terminated.
930 volatile TerminatedTypes _terminated;
931 // suspend/resume support
932 volatile bool _suspend_equivalent; // Suspend equivalent condition
933 jint _in_deopt_handler; // count of deoptimization
934 // handlers thread is in
935 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
936 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
937 // never locked) when throwing an exception. Used by interpreter only.
938
939 // JNI attach states:
940 enum JNIAttachStates {
941 _not_attaching_via_jni = 1, // thread is not attaching via JNI
942 _attaching_via_jni, // thread is attaching via JNI
943 _attached_via_jni // thread has attached via JNI
944 };
945
946 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
947 // A native thread that is attaching via JNI starts with a value
948 // of _attaching_via_jni and transitions to _attached_via_jni.
949 volatile JNIAttachStates _jni_attach_state;
950
951 public:
952 // State of the stack guard pages for this thread.
953 enum StackGuardState {
954 stack_guard_unused, // not needed
955 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
956 stack_guard_enabled // enabled
957 };
958
959 private:
960
961 StackGuardState _stack_guard_state;
962
963 // Precompute the limit of the stack as used in stack overflow checks.
964 // We load it from here to simplify the stack overflow check in assembly.
965 address _stack_overflow_limit;
966
967 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
968 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
969 // code)
970 volatile oop _exception_oop; // Exception thrown in compiled code
971 volatile address _exception_pc; // PC where exception happened
972 volatile address _exception_handler_pc; // PC for handler of exception
973 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
974
975 // support for JNI critical regions
976 jint _jni_active_critical; // count of entries into JNI critical region
977
978 // Checked JNI: function name requires exception check
979 char* _pending_jni_exception_check_fn;
980
981 // For deadlock detection.
982 int _depth_first_number;
983
984 // JVMTI PopFrame support
985 // This is set to popframe_pending to signal that top Java frame should be popped immediately
986 int _popframe_condition;
987
988 // If reallocation of scalar replaced objects fails, we throw OOM
989 // and during exception propagation, pop the top
990 // _frames_to_pop_failed_realloc frames, the ones that reference
991 // failed reallocations.
992 int _frames_to_pop_failed_realloc;
993
994 #ifndef PRODUCT
995 int _jmp_ring_index;
996 struct {
997 // We use intptr_t instead of address so debugger doesn't try and display strings
998 intptr_t _target;
999 intptr_t _instruction;
1000 const char* _file;
1001 int _line;
1002 } _jmp_ring[ jump_ring_buffer_size ];
1003 #endif /* PRODUCT */
1004
1005 #if INCLUDE_ALL_GCS
1006 // Support for G1 barriers
1007
1008 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
1009 // Set of all such queues.
1010 static SATBMarkQueueSet _satb_mark_queue_set;
1011
1012 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
1013 // Set of all such queues.
1014 static DirtyCardQueueSet _dirty_card_queue_set;
1015
1016 void flush_barrier_queues();
1017 #endif // INCLUDE_ALL_GCS
1018
1019 friend class VMThread;
1020 friend class ThreadWaitTransition;
1021 friend class VM_Exit;
1022
1023 void initialize(); // Initialized the instance variables
1024
1025 public:
1026 // Constructor
1027 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
1028 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
1029 ~JavaThread();
1030
1031 #ifdef ASSERT
1032 // verify this JavaThread hasn't be published in the Threads::list yet
1033 void verify_not_published();
1034 #endif
1035
1036 //JNI functiontable getter/setter for JVMTI jni function table interception API.
1037 void set_jni_functions(struct JNINativeInterface_* functionTable) {
1038 _jni_environment.functions = functionTable;
1039 }
1040 struct JNINativeInterface_* get_jni_functions() {
1041 return (struct JNINativeInterface_ *)_jni_environment.functions;
1042 }
1043
1044 // This function is called at thread creation to allow
1045 // platform specific thread variables to be initialized.
1046 void cache_global_variables();
1047
1048 // Executes Shutdown.shutdown()
1049 void invoke_shutdown_hooks();
1050
1051 // Cleanup on thread exit
1052 enum ExitType {
1053 normal_exit,
1054 jni_detach
1055 };
1056 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
1057
1058 void cleanup_failed_attach_current_thread();
1059
1060 // Testers
1061 virtual bool is_Java_thread() const { return true; }
1062
1063 // Thread chain operations
1064 JavaThread* next() const { return _next; }
1065 void set_next(JavaThread* p) { _next = p; }
1066
1067 // Thread oop. threadObj() can be NULL for initial JavaThread
1068 // (or for threads attached via JNI)
1069 oop threadObj() const { return _threadObj; }
1070 void set_threadObj(oop p) { _threadObj = p; }
1071
1072 ThreadPriority java_priority() const; // Read from threadObj()
1073
1074 // Prepare thread and add to priority queue. If a priority is
1075 // not specified, use the priority of the thread object. Threads_lock
1076 // must be held while this function is called.
1077 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1078 void prepare_ext();
1079
1080 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1081 address saved_exception_pc() { return _saved_exception_pc; }
1082
1083
1084 ThreadFunction entry_point() const { return _entry_point; }
1085
1086 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1087 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1088
1089 // Last frame anchor routines
1090
1091 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1092
1093 // last_Java_sp
1094 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1095 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1096
1097 // last_Java_pc
1098
1099 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1100
1101 // Safepoint support
1102 #if !(defined(PPC64) || defined(AARCH64))
1103 JavaThreadState thread_state() const { return _thread_state; }
1104 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1105 #else
1106 // Use membars when accessing volatile _thread_state. See
1107 // Threads::create_vm() for size checks.
1108 inline JavaThreadState thread_state() const;
1109 inline void set_thread_state(JavaThreadState s);
1110 #endif
1111 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1112 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1113 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1114
1115 // thread has called JavaThread::exit() or is terminated
1116 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1117 // thread is terminated (no longer on the threads list); we compare
1118 // against the two non-terminated values so that a freed JavaThread
1119 // will also be considered terminated.
1120 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1121 void set_terminated(TerminatedTypes t) { _terminated = t; }
1122 // special for Threads::remove() which is static:
1123 void set_terminated_value() { _terminated = _thread_terminated; }
1124 void block_if_vm_exited();
1125
1126 bool doing_unsafe_access() { return _doing_unsafe_access; }
1127 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1128
1129 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1130 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1131
1132 // Suspend/resume support for JavaThread
1133 private:
1134 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1135 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1136
1137 public:
1138 void java_suspend();
1139 void java_resume();
1140 int java_suspend_self();
1141
1142 void check_and_wait_while_suspended() {
1143 assert(JavaThread::current() == this, "sanity check");
1144
1145 bool do_self_suspend;
1146 do {
1147 // were we externally suspended while we were waiting?
1148 do_self_suspend = handle_special_suspend_equivalent_condition();
1149 if (do_self_suspend) {
1150 // don't surprise the thread that suspended us by returning
1151 java_suspend_self();
1152 set_suspend_equivalent();
1153 }
1154 } while (do_self_suspend);
1155 }
1156 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1157 // Check for async exception in addition to safepoint and suspend request.
1158 static void check_special_condition_for_native_trans(JavaThread *thread);
1159
1160 // Same as check_special_condition_for_native_trans but finishes the
1161 // transition into thread_in_Java mode so that it can potentially
1162 // block.
1163 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1164
1165 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1166 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1167 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1168 // Warning: is_ext_suspend_completed() may temporarily drop the
1169 // SR_lock to allow the thread to reach a stable thread state if
1170 // it is currently in a transient thread state.
1171 return is_ext_suspend_completed(false /*!called_by_wait */,
1172 SuspendRetryDelay, bits);
1173 }
1174
1175 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1176 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1177 // passed as the count and delay parameters. Experiments with specific
1178 // calls to wait_for_ext_suspend_completion() can be done by passing
1179 // other values in the code. Experiments with all calls can be done
1180 // via the appropriate -XX options.
1181 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1182
1183 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1184 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1185
1186 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1187 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1188 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1189
1190 bool is_external_suspend() const {
1191 return (_suspend_flags & _external_suspend) != 0;
1192 }
1193 // Whenever a thread transitions from native to vm/java it must suspend
1194 // if external|deopt suspend is present.
1195 bool is_suspend_after_native() const {
1196 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1197 }
1198
1199 // external suspend request is completed
1200 bool is_ext_suspended() const {
1201 return (_suspend_flags & _ext_suspended) != 0;
1202 }
1203
1204 bool is_external_suspend_with_lock() const {
1205 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1206 return is_external_suspend();
1207 }
1208
1209 // Special method to handle a pending external suspend request
1210 // when a suspend equivalent condition lifts.
1211 bool handle_special_suspend_equivalent_condition() {
1212 assert(is_suspend_equivalent(),
1213 "should only be called in a suspend equivalence condition");
1214 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1215 bool ret = is_external_suspend();
1216 if (!ret) {
1217 // not about to self-suspend so clear suspend equivalence
1218 clear_suspend_equivalent();
1219 }
1220 // implied else:
1221 // We have a pending external suspend request so we leave the
1222 // suspend_equivalent flag set until java_suspend_self() sets
1223 // the ext_suspended flag and clears the suspend_equivalent
1224 // flag. This insures that wait_for_ext_suspend_completion()
1225 // will return consistent values.
1226 return ret;
1227 }
1228
1229 // utility methods to see if we are doing some kind of suspension
1230 bool is_being_ext_suspended() const {
1231 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1232 return is_ext_suspended() || is_external_suspend();
1233 }
1234
1235 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1236
1237 void set_suspend_equivalent() { _suspend_equivalent = true; };
1238 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1239
1240 // Thread.stop support
1241 void send_thread_stop(oop throwable);
1242 AsyncRequests clear_special_runtime_exit_condition() {
1243 AsyncRequests x = _special_runtime_exit_condition;
1244 _special_runtime_exit_condition = _no_async_condition;
1245 return x;
1246 }
1247
1248 // Are any async conditions present?
1249 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1250
1251 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1252
1253 // these next two are also used for self-suspension and async exception support
1254 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1255
1256 // Return true if JavaThread has an asynchronous condition or
1257 // if external suspension is requested.
1258 bool has_special_runtime_exit_condition() {
1259 // We call is_external_suspend() last since external suspend should
1260 // be less common. Because we don't use is_external_suspend_with_lock
1261 // it is possible that we won't see an asynchronous external suspend
1262 // request that has just gotten started, i.e., SR_lock grabbed but
1263 // _external_suspend field change either not made yet or not visible
1264 // yet. However, this is okay because the request is asynchronous and
1265 // we will see the new flag value the next time through. It's also
1266 // possible that the external suspend request is dropped after
1267 // we have checked is_external_suspend(), we will recheck its value
1268 // under SR_lock in java_suspend_self().
1269 return (_special_runtime_exit_condition != _no_async_condition) ||
1270 is_external_suspend() || is_deopt_suspend();
1271 }
1272
1273 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1274
1275 void set_pending_async_exception(oop e) {
1276 _pending_async_exception = e;
1277 _special_runtime_exit_condition = _async_exception;
1278 set_has_async_exception();
1279 }
1280
1281 // Fast-locking support
1282 bool is_lock_owned(address adr) const;
1283
1284 // Accessors for vframe array top
1285 // The linked list of vframe arrays are sorted on sp. This means when we
1286 // unpack the head must contain the vframe array to unpack.
1287 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1288 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1289
1290 // Side structure for defering update of java frame locals until deopt occurs
1291 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1292 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1293
1294 // These only really exist to make debugging deopt problems simpler
1295
1296 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1297 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1298
1299 // The special resourceMark used during deoptimization
1300
1301 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1302 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1303
1304 intptr_t* must_deopt_id() { return _must_deopt_id; }
1305 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1306 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1307
1308 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1309 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1310
1311 Method* callee_target() const { return _callee_target; }
1312 void set_callee_target (Method* x) { _callee_target = x; }
1313
1314 // Oop results of vm runtime calls
1315 oop vm_result() const { return _vm_result; }
1316 void set_vm_result (oop x) { _vm_result = x; }
1317
1318 Metadata* vm_result_2() const { return _vm_result_2; }
1319 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1320
1321 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1322 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1323
1324 // Exception handling for compiled methods
1325 oop exception_oop() const { return _exception_oop; }
1326 address exception_pc() const { return _exception_pc; }
1327 address exception_handler_pc() const { return _exception_handler_pc; }
1328 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1329
1330 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1331 void set_exception_pc(address a) { _exception_pc = a; }
1332 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1333 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1334
1335 void clear_exception_oop_and_pc() {
1336 set_exception_oop(NULL);
1337 set_exception_pc(NULL);
1338 }
1339
1340 // Stack overflow support
1341 inline size_t stack_available(address cur_sp);
1342 address stack_yellow_zone_base()
1343 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1344 size_t stack_yellow_zone_size()
1345 { return StackYellowPages * os::vm_page_size(); }
1346 address stack_red_zone_base()
1347 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1348 size_t stack_red_zone_size()
1349 { return StackRedPages * os::vm_page_size(); }
1350 bool in_stack_yellow_zone(address a)
1351 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1352 bool in_stack_red_zone(address a)
1353 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1354
1355 void create_stack_guard_pages();
1356 void remove_stack_guard_pages();
1357
1358 void enable_stack_yellow_zone();
1359 void disable_stack_yellow_zone();
1360 void enable_stack_red_zone();
1361 void disable_stack_red_zone();
1362
1363 inline bool stack_guard_zone_unused();
1364 inline bool stack_yellow_zone_disabled();
1365 inline bool stack_yellow_zone_enabled();
1366
1367 // Attempt to reguard the stack after a stack overflow may have occurred.
1368 // Returns true if (a) guard pages are not needed on this thread, (b) the
1369 // pages are already guarded, or (c) the pages were successfully reguarded.
1370 // Returns false if there is not enough stack space to reguard the pages, in
1371 // which case the caller should unwind a frame and try again. The argument
1372 // should be the caller's (approximate) sp.
1373 bool reguard_stack(address cur_sp);
1374 // Similar to above but see if current stackpoint is out of the guard area
1375 // and reguard if possible.
1376 bool reguard_stack(void);
1377
1378 address stack_overflow_limit() { return _stack_overflow_limit; }
1379 void set_stack_overflow_limit() {
1380 _stack_overflow_limit = _stack_base - _stack_size +
1381 ((StackShadowPages +
1382 StackYellowPages +
1383 StackRedPages) * os::vm_page_size());
1384 }
1385
1386 // Misc. accessors/mutators
1387 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1388 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1389 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1390
1391 #ifndef PRODUCT
1392 void record_jump(address target, address instr, const char* file, int line);
1393 #endif /* PRODUCT */
1394
1395 // For assembly stub generation
1396 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1397 #ifndef PRODUCT
1398 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1399 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1400 #endif /* PRODUCT */
1401 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1402 static ByteSize last_Java_sp_offset() {
1403 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1404 }
1405 static ByteSize last_Java_pc_offset() {
1406 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1407 }
1408 static ByteSize frame_anchor_offset() {
1409 return byte_offset_of(JavaThread, _anchor);
1410 }
1411 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1412 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1413 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1414 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1415 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1416 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1417 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1418 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1419 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1420 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1421 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1422 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1423 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1424
1425 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1426 static ByteSize should_post_on_exceptions_flag_offset() {
1427 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1428 }
1429
1430 #if INCLUDE_ALL_GCS
1431 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1432 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1433
1434 static ByteSize gc_state_offset() { return byte_offset_of(JavaThread, _gc_state); }
1435
1436 #endif // INCLUDE_ALL_GCS
1437
1438 // Returns the jni environment for this thread
1439 JNIEnv* jni_environment() { return &_jni_environment; }
1440
1441 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1442 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1443 // Only return NULL if thread is off the thread list; starting to
1444 // exit should not return NULL.
1445 if (thread_from_jni_env->is_terminated()) {
1446 thread_from_jni_env->block_if_vm_exited();
1447 return NULL;
1448 } else {
1449 return thread_from_jni_env;
1450 }
1451 }
1452
1453 // JNI critical regions. These can nest.
1454 bool in_critical() { return _jni_active_critical > 0; }
1455 bool in_last_critical() { return _jni_active_critical == 1; }
1456 void enter_critical() { assert(Thread::current() == this ||
1457 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1458 "this must be current thread or synchronizing");
1459 _jni_active_critical++; }
1460 void exit_critical() { assert(Thread::current() == this,
1461 "this must be current thread");
1462 _jni_active_critical--;
1463 assert(_jni_active_critical >= 0,
1464 "JNI critical nesting problem?"); }
1465
1466 // Checked JNI, is the programmer required to check for exceptions, specify which function name
1467 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
1468 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
1469 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
1470 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
1471
1472 // For deadlock detection
1473 int depth_first_number() { return _depth_first_number; }
1474 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1475
1476 private:
1477 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1478
1479 public:
1480 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1481 void add_monitor_chunk(MonitorChunk* chunk);
1482 void remove_monitor_chunk(MonitorChunk* chunk);
1483 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1484 void inc_in_deopt_handler() { _in_deopt_handler++; }
1485 void dec_in_deopt_handler() {
1486 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1487 if (_in_deopt_handler > 0) { // robustness
1488 _in_deopt_handler--;
1489 }
1490 }
1491
1492 private:
1493 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1494
1495 public:
1496
1497 // Frame iteration; calls the function f for all frames on the stack
1498 void frames_do(void f(frame*, const RegisterMap*));
1499
1500 // Memory operations
1501 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1502
1503 // Sweeper operations
1504 void nmethods_do(CodeBlobClosure* cf);
1505
1506 // RedefineClasses Support
1507 void metadata_do(void f(Metadata*));
1508
1509 // Memory management operations
1510 void gc_epilogue();
1511 void gc_prologue();
1512
1513 // Misc. operations
1514 char* name() const { return (char*)get_thread_name(); }
1515 void print_on(outputStream* st) const;
1516 void print() const { print_on(tty); }
1517 void print_value();
1518 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1519 void print_thread_state() const PRODUCT_RETURN;
1520 void print_on_error(outputStream* st, char* buf, int buflen) const;
1521 void verify();
1522 const char* get_thread_name() const;
1523 private:
1524 // factor out low-level mechanics for use in both normal and error cases
1525 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1526 public:
1527 const char* get_threadgroup_name() const;
1528 const char* get_parent_name() const;
1529
1530 // Accessing frames
1531 frame last_frame() {
1532 _anchor.make_walkable(this);
1533 return pd_last_frame();
1534 }
1535 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1536
1537 // Returns method at 'depth' java or native frames down the stack
1538 // Used for security checks
1539 Klass* security_get_caller_class(int depth);
1540
1541 // Print stack trace in external format
1542 void print_stack_on(outputStream* st);
1543 void print_stack() { print_stack_on(tty); }
1544
1545 // Print stack traces in various internal formats
1546 void trace_stack() PRODUCT_RETURN;
1547 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1548 void trace_frames() PRODUCT_RETURN;
1549 void trace_oops() PRODUCT_RETURN;
1550
1551 // Print an annotated view of the stack frames
1552 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1553 void validate_frame_layout() {
1554 print_frame_layout(0, true);
1555 }
1556
1557 // Returns the number of stack frames on the stack
1558 int depth() const;
1559
1560 // Function for testing deoptimization
1561 void deoptimize();
1562 void make_zombies();
1563
1564 void deoptimized_wrt_marked_nmethods();
1565
1566 // Profiling operation (see fprofile.cpp)
1567 public:
1568 bool profile_last_Java_frame(frame* fr);
1569
1570 private:
1571 ThreadProfiler* _thread_profiler;
1572 private:
1573 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1574 friend class FlatProfilerTask; // uses get_thread_profiler.
1575 friend class ThreadProfilerMark; // uses get_thread_profiler.
1576 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1577 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1578 ThreadProfiler* result = _thread_profiler;
1579 _thread_profiler = tp;
1580 return result;
1581 }
1582
1583 public:
1584 // Returns the running thread as a JavaThread
1585 static inline JavaThread* current();
1586
1587 // Returns the active Java thread. Do not use this if you know you are calling
1588 // from a JavaThread, as it's slower than JavaThread::current. If called from
1589 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1590 // operation. You may not want that either.
1591 static JavaThread* active();
1592
1593 inline CompilerThread* as_CompilerThread();
1594
1595 public:
1596 virtual void run();
1597 void thread_main_inner();
1598
1599 private:
1600 // PRIVILEGED STACK
1601 PrivilegedElement* _privileged_stack_top;
1602 GrowableArray<oop>* _array_for_gc;
1603 public:
1604
1605 // Returns the privileged_stack information.
1606 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1607 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1608 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1609
1610 public:
1611 // Thread local information maintained by JVMTI.
1612 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1613 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1614 // getter is used to get this JavaThread's JvmtiThreadState if it has
1615 // one which means NULL can be returned. JvmtiThreadState::state_for()
1616 // is used to get the specified JavaThread's JvmtiThreadState if it has
1617 // one or it allocates a new JvmtiThreadState for the JavaThread and
1618 // returns it. JvmtiThreadState::state_for() will return NULL only if
1619 // the specified JavaThread is exiting.
1620 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1621 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1622 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1623 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1624
1625 // JVMTI PopFrame support
1626 // Setting and clearing popframe_condition
1627 // All of these enumerated values are bits. popframe_pending
1628 // indicates that a PopFrame() has been requested and not yet been
1629 // completed. popframe_processing indicates that that PopFrame() is in
1630 // the process of being completed. popframe_force_deopt_reexecution_bit
1631 // indicates that special handling is required when returning to a
1632 // deoptimized caller.
1633 enum PopCondition {
1634 popframe_inactive = 0x00,
1635 popframe_pending_bit = 0x01,
1636 popframe_processing_bit = 0x02,
1637 popframe_force_deopt_reexecution_bit = 0x04
1638 };
1639 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1640 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1641 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1642 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1643 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1644 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1645 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1646 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1647 #ifdef CC_INTERP
1648 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1649 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1650 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1651 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1652 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1653 #endif
1654
1655 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
1656 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
1657 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
1658
1659 private:
1660 // Saved incoming arguments to popped frame.
1661 // Used only when popped interpreted frame returns to deoptimized frame.
1662 void* _popframe_preserved_args;
1663 int _popframe_preserved_args_size;
1664
1665 public:
1666 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1667 void* popframe_preserved_args();
1668 ByteSize popframe_preserved_args_size();
1669 WordSize popframe_preserved_args_size_in_words();
1670 void popframe_free_preserved_args();
1671
1672
1673 private:
1674 JvmtiThreadState *_jvmti_thread_state;
1675 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1676
1677 // Used by the interpreter in fullspeed mode for frame pop, method
1678 // entry, method exit and single stepping support. This field is
1679 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1680 // It can be set to zero asynchronously (i.e., without a VM operation
1681 // or a lock) so we have to be very careful.
1682 int _interp_only_mode;
1683
1684 public:
1685 // used by the interpreter for fullspeed debugging support (see above)
1686 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1687 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1688 int get_interp_only_mode() { return _interp_only_mode; }
1689 void increment_interp_only_mode() { ++_interp_only_mode; }
1690 void decrement_interp_only_mode() { --_interp_only_mode; }
1691
1692 // support for cached flag that indicates whether exceptions need to be posted for this thread
1693 // if this is false, we can avoid deoptimizing when events are thrown
1694 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1695 private:
1696 int _should_post_on_exceptions_flag;
1697
1698 public:
1699 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1700 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1701
1702 private:
1703 ThreadStatistics *_thread_stat;
1704
1705 public:
1706 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1707
1708 // Return a blocker object for which this thread is blocked parking.
1709 oop current_park_blocker();
1710
1711 private:
1712 static size_t _stack_size_at_create;
1713
1714 public:
1715 static inline size_t stack_size_at_create(void) {
1716 return _stack_size_at_create;
1717 }
1718 static inline void set_stack_size_at_create(size_t value) {
1719 _stack_size_at_create = value;
1720 }
1721
1722 #if INCLUDE_ALL_GCS
1723 // SATB marking queue support
1724 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1725 static SATBMarkQueueSet& satb_mark_queue_set() {
1726 return _satb_mark_queue_set;
1727 }
1728
1729 // Dirty card queue support
1730 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1731 static DirtyCardQueueSet& dirty_card_queue_set() {
1732 return _dirty_card_queue_set;
1733 }
1734
1735 inline char gc_state() const;
1736
1737 private:
1738 void set_gc_state(char in_prog);
1739
1740 public:
1741 static void set_gc_state_all_threads(char in_prog);
1742 static void set_force_satb_flush_all_threads(bool value);
1743 #endif // INCLUDE_ALL_GCS
1744
1745 // This method initializes the SATB and dirty card queues before a
1746 // JavaThread is added to the Java thread list. Right now, we don't
1747 // have to do anything to the dirty card queue (it should have been
1748 // activated when the thread was created), but we have to activate
1749 // the SATB queue if the thread is created while a marking cycle is
1750 // in progress. The activation / de-activation of the SATB queues at
1751 // the beginning / end of a marking cycle is done during safepoints
1752 // so we have to make sure this method is called outside one to be
1753 // able to safely read the active field of the SATB queue set. Right
1754 // now, it is called just before the thread is added to the Java
1755 // thread list in the Threads::add() method. That method is holding
1756 // the Threads_lock which ensures we are outside a safepoint. We
1757 // cannot do the obvious and set the active field of the SATB queue
1758 // when the thread is created given that, in some cases, safepoints
1759 // might happen between the JavaThread constructor being called and the
1760 // thread being added to the Java thread list (an example of this is
1761 // when the structure for the DestroyJavaVM thread is created).
1762 #if INCLUDE_ALL_GCS
1763 void initialize_queues();
1764 #else // INCLUDE_ALL_GCS
1765 void initialize_queues() { }
1766 #endif // INCLUDE_ALL_GCS
1767
1768 // Machine dependent stuff
1769 #ifdef TARGET_OS_ARCH_linux_x86
1770 # include "thread_linux_x86.hpp"
1771 #endif
1772 #ifdef TARGET_OS_ARCH_linux_aarch64
1773 # include "thread_linux_aarch64.hpp"
1774 #endif
1775 #ifdef TARGET_OS_ARCH_linux_sparc
1776 # include "thread_linux_sparc.hpp"
1777 #endif
1778 #ifdef TARGET_OS_ARCH_linux_zero
1779 # include "thread_linux_zero.hpp"
1780 #endif
1781 #ifdef TARGET_OS_ARCH_solaris_x86
1782 # include "thread_solaris_x86.hpp"
1783 #endif
1784 #ifdef TARGET_OS_ARCH_solaris_sparc
1785 # include "thread_solaris_sparc.hpp"
1786 #endif
1787 #ifdef TARGET_OS_ARCH_windows_x86
1788 # include "thread_windows_x86.hpp"
1789 #endif
1790 #ifdef TARGET_OS_ARCH_linux_arm
1791 # include "thread_linux_arm.hpp"
1792 #endif
1793 #ifdef TARGET_OS_ARCH_linux_ppc
1794 # include "thread_linux_ppc.hpp"
1795 #endif
1796 #ifdef TARGET_OS_ARCH_aix_ppc
1797 # include "thread_aix_ppc.hpp"
1798 #endif
1799 #ifdef TARGET_OS_ARCH_bsd_x86
1800 # include "thread_bsd_x86.hpp"
1801 #endif
1802 #ifdef TARGET_OS_ARCH_bsd_zero
1803 # include "thread_bsd_zero.hpp"
1804 #endif
1805
1806
1807 public:
1808 void set_blocked_on_compilation(bool value) {
1809 _blocked_on_compilation = value;
1810 }
1811
1812 bool blocked_on_compilation() {
1813 return _blocked_on_compilation;
1814 }
1815 protected:
1816 bool _blocked_on_compilation;
1817
1818
1819 // JSR166 per-thread parker
1820 private:
1821 Parker* _parker;
1822 public:
1823 Parker* parker() { return _parker; }
1824
1825 // Biased locking support
1826 private:
1827 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1828 public:
1829 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1830 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1831
1832 // clearing/querying jni attach status
1833 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1834 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1835 inline void set_done_attaching_via_jni();
1836 private:
1837 // This field is used to determine if a thread has claimed
1838 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1839 // otherwise its value is the par_id that has been claimed.
1840 uint _claimed_par_id;
1841 public:
1842 uint get_claimed_par_id() { return _claimed_par_id; }
1843 void set_claimed_par_id(uint id) { _claimed_par_id = id;}
1844 };
1845
1846 // Inline implementation of JavaThread::current
1847 inline JavaThread* JavaThread::current() {
1848 Thread* thread = ThreadLocalStorage::thread();
1849 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1850 return (JavaThread*)thread;
1851 }
1852
1853 inline CompilerThread* JavaThread::as_CompilerThread() {
1854 assert(is_Compiler_thread(), "just checking");
1855 return (CompilerThread*)this;
1856 }
1857
1858 inline bool JavaThread::stack_guard_zone_unused() {
1859 return _stack_guard_state == stack_guard_unused;
1860 }
1861
1862 inline bool JavaThread::stack_yellow_zone_disabled() {
1863 return _stack_guard_state == stack_guard_yellow_disabled;
1864 }
1865
1866 inline bool JavaThread::stack_yellow_zone_enabled() {
1867 #ifdef ASSERT
1868 if (os::uses_stack_guard_pages() &&
1869 !(DisablePrimordialThreadGuardPages && os::is_primordial_thread())) {
1870 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1871 }
1872 #endif
1873 return _stack_guard_state == stack_guard_enabled;
1874 }
1875
1876 inline size_t JavaThread::stack_available(address cur_sp) {
1877 // This code assumes java stacks grow down
1878 address low_addr; // Limit on the address for deepest stack depth
1879 if ( _stack_guard_state == stack_guard_unused) {
1880 low_addr = stack_base() - stack_size();
1881 } else {
1882 low_addr = stack_yellow_zone_base();
1883 }
1884 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1885 }
1886
1887 // A thread used for Compilation.
1888 class CompilerThread : public JavaThread {
1889 friend class VMStructs;
1890 private:
1891 CompilerCounters* _counters;
1892
1893 ciEnv* _env;
1894 CompileLog* _log;
1895 CompileTask* _task;
1896 CompileQueue* _queue;
1897 BufferBlob* _buffer_blob;
1898
1899 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1900 AbstractCompiler* _compiler;
1901
1902 public:
1903
1904 static CompilerThread* current();
1905
1906 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1907
1908 bool is_Compiler_thread() const { return true; }
1909 // Hide this compiler thread from external view.
1910 bool is_hidden_from_external_view() const { return true; }
1911
1912 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1913 AbstractCompiler* compiler() const { return _compiler; }
1914
1915 CompileQueue* queue() const { return _queue; }
1916 CompilerCounters* counters() const { return _counters; }
1917
1918 // Get/set the thread's compilation environment.
1919 ciEnv* env() { return _env; }
1920 void set_env(ciEnv* env) { _env = env; }
1921
1922 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1923 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1924
1925 // Get/set the thread's logging information
1926 CompileLog* log() { return _log; }
1927 void init_log(CompileLog* log) {
1928 // Set once, for good.
1929 assert(_log == NULL, "set only once");
1930 _log = log;
1931 }
1932
1933 // GC support
1934 // Apply "f->do_oop" to all root oops in "this".
1935 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1936 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1937
1938 #ifndef PRODUCT
1939 private:
1940 IdealGraphPrinter *_ideal_graph_printer;
1941 public:
1942 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1943 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1944 #endif
1945
1946 // Get/set the thread's current task
1947 CompileTask* task() { return _task; }
1948 void set_task(CompileTask* task) { _task = task; }
1949
1950 // Track the nmethod currently being scanned by the sweeper
1951 void set_scanned_nmethod(nmethod* nm) {
1952 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1953 _scanned_nmethod = nm;
1954 }
1955 };
1956
1957 inline CompilerThread* CompilerThread::current() {
1958 return JavaThread::current()->as_CompilerThread();
1959 }
1960
1961
1962 // The active thread queue. It also keeps track of the current used
1963 // thread priorities.
1964 class Threads: AllStatic {
1965 friend class VMStructs;
1966 private:
1967 static JavaThread* _thread_list;
1968 static int _number_of_threads;
1969 static int _number_of_non_daemon_threads;
1970 static int _return_code;
1971 #ifdef ASSERT
1972 static bool _vm_complete;
1973 #endif
1974
1975 public:
1976 // Thread management
1977 // force_daemon is a concession to JNI, where we may need to add a
1978 // thread to the thread list before allocating its thread object
1979 static void add(JavaThread* p, bool force_daemon = false);
1980 static void remove(JavaThread* p);
1981 static bool includes(JavaThread* p);
1982 static JavaThread* first() { return _thread_list; }
1983 static void threads_do(ThreadClosure* tc);
1984 static void java_threads_do(ThreadClosure* tc);
1985
1986 // Initializes the vm and creates the vm thread
1987 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1988 static void convert_vm_init_libraries_to_agents();
1989 static void create_vm_init_libraries();
1990 static void create_vm_init_agents();
1991 static void shutdown_vm_agents();
1992 static bool destroy_vm();
1993 // Supported VM versions via JNI
1994 // Includes JNI_VERSION_1_1
1995 static jboolean is_supported_jni_version_including_1_1(jint version);
1996 // Does not include JNI_VERSION_1_1
1997 static jboolean is_supported_jni_version(jint version);
1998
1999 // Garbage collection
2000 static void follow_other_roots(void f(oop*));
2001
2002 // Apply "f->do_oop" to all root oops in all threads.
2003 // This version may only be called by sequential code.
2004 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
2005 // This version may be called by sequential or parallel code.
2006 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
2007 // This creates a list of GCTasks, one per thread.
2008 static void create_thread_roots_tasks(GCTaskQueue* q);
2009 // This creates a list of GCTasks, one per thread, for marking objects.
2010 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
2011
2012 // Apply "f->do_oop" to roots in all threads that
2013 // are part of compiled frames
2014 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
2015
2016 static void convert_hcode_pointers();
2017 static void restore_hcode_pointers();
2018
2019 // Sweeper
2020 static void nmethods_do(CodeBlobClosure* cf);
2021
2022 // RedefineClasses support
2023 static void metadata_do(void f(Metadata*));
2024
2025 static void gc_epilogue();
2026 static void gc_prologue();
2027 #ifdef ASSERT
2028 static bool is_vm_complete() { return _vm_complete; }
2029 #endif
2030
2031 // Verification
2032 static void verify();
2033 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
2034 static void print(bool print_stacks, bool internal_format) {
2035 // this function is only used by debug.cpp
2036 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
2037 }
2038 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
2039
2040 // Get Java threads that are waiting to enter a monitor. If doLock
2041 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2042 // VM needs to be at a safepoint.
2043 static GrowableArray<JavaThread*>* get_pending_threads(int count,
2044 address monitor, bool doLock);
2045
2046 // Get owning Java thread from the monitor's owner field. If doLock
2047 // is true, then Threads_lock is grabbed as needed. Otherwise, the
2048 // VM needs to be at a safepoint.
2049 static JavaThread *owning_thread_from_monitor_owner(address owner,
2050 bool doLock);
2051
2052 // Number of threads on the active threads list
2053 static int number_of_threads() { return _number_of_threads; }
2054 // Number of non-daemon threads on the active threads list
2055 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
2056
2057 // Deoptimizes all frames tied to marked nmethods
2058 static void deoptimized_wrt_marked_nmethods();
2059
2060 static JavaThread* find_java_thread_from_java_tid(jlong java_tid);
2061
2062 };
2063
2064
2065 // Thread iterator
2066 class ThreadClosure: public StackObj {
2067 public:
2068 virtual void do_thread(Thread* thread) = 0;
2069 };
2070
2071 class SignalHandlerMark: public StackObj {
2072 private:
2073 Thread* _thread;
2074 public:
2075 SignalHandlerMark(Thread* t) {
2076 _thread = t;
2077 if (_thread) _thread->enter_signal_handler();
2078 }
2079 ~SignalHandlerMark() {
2080 if (_thread) _thread->leave_signal_handler();
2081 _thread = NULL;
2082 }
2083 };
2084
2085
2086 #endif // SHARE_VM_RUNTIME_THREAD_HPP