Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/thread.cpp @ 793:eacd97c88873
6848466: frame::frame_size() assertion failure with -XX:+DebugDeoptimization
Summary: add a RegisterMap* argument to frame::frame_size() to correctly compute the sender frame
Reviewed-by: never
author | cfang |
---|---|
date | Fri, 05 Jun 2009 10:25:39 -0700 |
parents | b9fba36710f2 |
children | 821269eca479 |
rev | line source |
---|---|
0 | 1 /* |
196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_thread.cpp.incl" | |
27 | |
28 #ifdef DTRACE_ENABLED | |
29 | |
30 // Only bother with this argument setup if dtrace is available | |
31 | |
32 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); | |
33 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
34 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
35 intptr_t, intptr_t, bool); | |
36 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
37 intptr_t, intptr_t, bool); | |
38 | |
39 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
40 { \ | |
41 ResourceMark rm(this); \ | |
42 int len = 0; \ | |
43 const char* name = (javathread)->get_thread_name(); \ | |
44 len = strlen(name); \ | |
45 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
46 name, len, \ | |
47 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
48 (javathread)->osthread()->thread_id(), \ | |
49 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
50 } | |
51 | |
52 #else // ndef DTRACE_ENABLED | |
53 | |
54 #define DTRACE_THREAD_PROBE(probe, javathread) | |
55 | |
56 #endif // ndef DTRACE_ENABLED | |
57 | |
58 // Class hierarchy | |
59 // - Thread | |
60 // - VMThread | |
61 // - WatcherThread | |
62 // - ConcurrentMarkSweepThread | |
63 // - JavaThread | |
64 // - CompilerThread | |
65 | |
66 // ======= Thread ======== | |
67 | |
68 // Support for forcing alignment of thread objects for biased locking | |
69 void* Thread::operator new(size_t size) { | |
70 if (UseBiasedLocking) { | |
71 const int alignment = markOopDesc::biased_lock_alignment; | |
72 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
73 void* real_malloc_addr = CHeapObj::operator new(aligned_size); | |
74 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); | |
75 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
76 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
77 "JavaThread alignment code overflowed allocated storage"); | |
78 if (TraceBiasedLocking) { | |
79 if (aligned_addr != real_malloc_addr) | |
80 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
81 real_malloc_addr, aligned_addr); | |
82 } | |
83 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
84 return aligned_addr; | |
85 } else { | |
86 return CHeapObj::operator new(size); | |
87 } | |
88 } | |
89 | |
90 void Thread::operator delete(void* p) { | |
91 if (UseBiasedLocking) { | |
92 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
93 CHeapObj::operator delete(real_malloc_addr); | |
94 } else { | |
95 CHeapObj::operator delete(p); | |
96 } | |
97 } | |
98 | |
99 | |
100 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
101 // JavaThread | |
102 | |
103 | |
104 Thread::Thread() { | |
105 // stack | |
106 _stack_base = NULL; | |
107 _stack_size = 0; | |
108 _self_raw_id = 0; | |
109 _lgrp_id = -1; | |
110 _osthread = NULL; | |
111 | |
112 // allocated data structures | |
113 set_resource_area(new ResourceArea()); | |
114 set_handle_area(new HandleArea(NULL)); | |
115 set_active_handles(NULL); | |
116 set_free_handle_block(NULL); | |
117 set_last_handle_mark(NULL); | |
118 set_osthread(NULL); | |
119 | |
120 // This initial value ==> never claimed. | |
121 _oops_do_parity = 0; | |
122 | |
123 // the handle mark links itself to last_handle_mark | |
124 new HandleMark(this); | |
125 | |
126 // plain initialization | |
127 debug_only(_owned_locks = NULL;) | |
128 debug_only(_allow_allocation_count = 0;) | |
129 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
130 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) | |
131 _jvmti_env_iteration_count = 0; | |
132 _vm_operation_started_count = 0; | |
133 _vm_operation_completed_count = 0; | |
134 _current_pending_monitor = NULL; | |
135 _current_pending_monitor_is_from_java = true; | |
136 _current_waiting_monitor = NULL; | |
137 _num_nested_signal = 0; | |
138 omFreeList = NULL ; | |
139 omFreeCount = 0 ; | |
140 omFreeProvision = 32 ; | |
141 | |
142 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); | |
143 _suspend_flags = 0; | |
144 | |
145 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
146 _hashStateX = os::random() ; | |
147 _hashStateY = 842502087 ; | |
148 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
149 _hashStateW = 273326509 ; | |
150 | |
151 _OnTrap = 0 ; | |
152 _schedctl = NULL ; | |
153 _Stalled = 0 ; | |
154 _TypeTag = 0x2BAD ; | |
155 | |
156 // Many of the following fields are effectively final - immutable | |
157 // Note that nascent threads can't use the Native Monitor-Mutex | |
158 // construct until the _MutexEvent is initialized ... | |
159 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
160 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
161 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
162 // and ::Release() | |
163 _ParkEvent = ParkEvent::Allocate (this) ; | |
164 _SleepEvent = ParkEvent::Allocate (this) ; | |
165 _MutexEvent = ParkEvent::Allocate (this) ; | |
166 _MuxEvent = ParkEvent::Allocate (this) ; | |
167 | |
168 #ifdef CHECK_UNHANDLED_OOPS | |
169 if (CheckUnhandledOops) { | |
170 _unhandled_oops = new UnhandledOops(this); | |
171 } | |
172 #endif // CHECK_UNHANDLED_OOPS | |
173 #ifdef ASSERT | |
174 if (UseBiasedLocking) { | |
175 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
176 assert(this == _real_malloc_address || | |
177 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
178 "bug in forced alignment of thread objects"); | |
179 } | |
180 #endif /* ASSERT */ | |
181 } | |
182 | |
183 void Thread::initialize_thread_local_storage() { | |
184 // Note: Make sure this method only calls | |
185 // non-blocking operations. Otherwise, it might not work | |
186 // with the thread-startup/safepoint interaction. | |
187 | |
188 // During Java thread startup, safepoint code should allow this | |
189 // method to complete because it may need to allocate memory to | |
190 // store information for the new thread. | |
191 | |
192 // initialize structure dependent on thread local storage | |
193 ThreadLocalStorage::set_thread(this); | |
194 | |
195 // set up any platform-specific state. | |
196 os::initialize_thread(); | |
197 | |
198 } | |
199 | |
200 void Thread::record_stack_base_and_size() { | |
201 set_stack_base(os::current_stack_base()); | |
202 set_stack_size(os::current_stack_size()); | |
203 } | |
204 | |
205 | |
206 Thread::~Thread() { | |
207 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
208 ObjectSynchronizer::omFlush (this) ; | |
209 | |
210 // deallocate data structures | |
211 delete resource_area(); | |
212 // since the handle marks are using the handle area, we have to deallocated the root | |
213 // handle mark before deallocating the thread's handle area, | |
214 assert(last_handle_mark() != NULL, "check we have an element"); | |
215 delete last_handle_mark(); | |
216 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
217 | |
218 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
219 // We NULL out the fields for good hygiene. | |
220 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
221 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
222 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
223 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
224 | |
225 delete handle_area(); | |
226 | |
227 // osthread() can be NULL, if creation of thread failed. | |
228 if (osthread() != NULL) os::free_thread(osthread()); | |
229 | |
230 delete _SR_lock; | |
231 | |
232 // clear thread local storage if the Thread is deleting itself | |
233 if (this == Thread::current()) { | |
234 ThreadLocalStorage::set_thread(NULL); | |
235 } else { | |
236 // In the case where we're not the current thread, invalidate all the | |
237 // caches in case some code tries to get the current thread or the | |
238 // thread that was destroyed, and gets stale information. | |
239 ThreadLocalStorage::invalidate_all(); | |
240 } | |
241 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
242 } | |
243 | |
244 // NOTE: dummy function for assertion purpose. | |
245 void Thread::run() { | |
246 ShouldNotReachHere(); | |
247 } | |
248 | |
249 #ifdef ASSERT | |
250 // Private method to check for dangling thread pointer | |
251 void check_for_dangling_thread_pointer(Thread *thread) { | |
252 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
253 "possibility of dangling Thread pointer"); | |
254 } | |
255 #endif | |
256 | |
257 | |
258 #ifndef PRODUCT | |
259 // Tracing method for basic thread operations | |
260 void Thread::trace(const char* msg, const Thread* const thread) { | |
261 if (!TraceThreadEvents) return; | |
262 ResourceMark rm; | |
263 ThreadCritical tc; | |
264 const char *name = "non-Java thread"; | |
265 int prio = -1; | |
266 if (thread->is_Java_thread() | |
267 && !thread->is_Compiler_thread()) { | |
268 // The Threads_lock must be held to get information about | |
269 // this thread but may not be in some situations when | |
270 // tracing thread events. | |
271 bool release_Threads_lock = false; | |
272 if (!Threads_lock->owned_by_self()) { | |
273 Threads_lock->lock(); | |
274 release_Threads_lock = true; | |
275 } | |
276 JavaThread* jt = (JavaThread *)thread; | |
277 name = (char *)jt->get_thread_name(); | |
278 oop thread_oop = jt->threadObj(); | |
279 if (thread_oop != NULL) { | |
280 prio = java_lang_Thread::priority(thread_oop); | |
281 } | |
282 if (release_Threads_lock) { | |
283 Threads_lock->unlock(); | |
284 } | |
285 } | |
286 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
287 } | |
288 #endif | |
289 | |
290 | |
291 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
292 trace("get priority", thread); | |
293 ThreadPriority priority; | |
294 // Can return an error! | |
295 (void)os::get_priority(thread, priority); | |
296 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
297 return priority; | |
298 } | |
299 | |
300 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
301 trace("set priority", thread); | |
302 debug_only(check_for_dangling_thread_pointer(thread);) | |
303 // Can return an error! | |
304 (void)os::set_priority(thread, priority); | |
305 } | |
306 | |
307 | |
308 void Thread::start(Thread* thread) { | |
309 trace("start", thread); | |
310 // Start is different from resume in that its safety is guaranteed by context or | |
311 // being called from a Java method synchronized on the Thread object. | |
312 if (!DisableStartThread) { | |
313 if (thread->is_Java_thread()) { | |
314 // Initialize the thread state to RUNNABLE before starting this thread. | |
315 // Can not set it after the thread started because we do not know the | |
316 // exact thread state at that time. It could be in MONITOR_WAIT or | |
317 // in SLEEPING or some other state. | |
318 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
319 java_lang_Thread::RUNNABLE); | |
320 } | |
321 os::start_thread(thread); | |
322 } | |
323 } | |
324 | |
325 // Enqueue a VM_Operation to do the job for us - sometime later | |
326 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
327 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
328 VMThread::execute(vm_stop); | |
329 } | |
330 | |
331 | |
332 // | |
333 // Check if an external suspend request has completed (or has been | |
334 // cancelled). Returns true if the thread is externally suspended and | |
335 // false otherwise. | |
336 // | |
337 // The bits parameter returns information about the code path through | |
338 // the routine. Useful for debugging: | |
339 // | |
340 // set in is_ext_suspend_completed(): | |
341 // 0x00000001 - routine was entered | |
342 // 0x00000010 - routine return false at end | |
343 // 0x00000100 - thread exited (return false) | |
344 // 0x00000200 - suspend request cancelled (return false) | |
345 // 0x00000400 - thread suspended (return true) | |
346 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
347 // 0x00002000 - thread is native and walkable (return true) | |
348 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
349 // | |
350 // set in wait_for_ext_suspend_completion(): | |
351 // 0x00010000 - routine was entered | |
352 // 0x00020000 - suspend request cancelled before loop (return false) | |
353 // 0x00040000 - thread suspended before loop (return true) | |
354 // 0x00080000 - suspend request cancelled in loop (return false) | |
355 // 0x00100000 - thread suspended in loop (return true) | |
356 // 0x00200000 - suspend not completed during retry loop (return false) | |
357 // | |
358 | |
359 // Helper class for tracing suspend wait debug bits. | |
360 // | |
361 // 0x00000100 indicates that the target thread exited before it could | |
362 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
363 // 0x00080000 each indicate a cancelled suspend request so they don't | |
364 // count as wait failures either. | |
365 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
366 | |
367 class TraceSuspendDebugBits : public StackObj { | |
368 private: | |
369 JavaThread * jt; | |
370 bool is_wait; | |
371 bool called_by_wait; // meaningful when !is_wait | |
372 uint32_t * bits; | |
373 | |
374 public: | |
375 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
376 uint32_t *_bits) { | |
377 jt = _jt; | |
378 is_wait = _is_wait; | |
379 called_by_wait = _called_by_wait; | |
380 bits = _bits; | |
381 } | |
382 | |
383 ~TraceSuspendDebugBits() { | |
384 if (!is_wait) { | |
385 #if 1 | |
386 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
387 // That trace is very chatty. | |
388 return; | |
389 #else | |
390 if (!called_by_wait) { | |
391 // If tracing for is_ext_suspend_completed() is enabled, then only | |
392 // trace calls to it from wait_for_ext_suspend_completion() | |
393 return; | |
394 } | |
395 #endif | |
396 } | |
397 | |
398 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
399 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
400 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
401 ResourceMark rm; | |
402 | |
403 tty->print_cr( | |
404 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
405 jt->get_thread_name(), *bits); | |
406 | |
407 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
408 } | |
409 } | |
410 } | |
411 }; | |
412 #undef DEBUG_FALSE_BITS | |
413 | |
414 | |
415 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
416 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
417 | |
418 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
419 bool do_trans_retry; // flag to force the retry | |
420 | |
421 *bits |= 0x00000001; | |
422 | |
423 do { | |
424 do_trans_retry = false; | |
425 | |
426 if (is_exiting()) { | |
427 // Thread is in the process of exiting. This is always checked | |
428 // first to reduce the risk of dereferencing a freed JavaThread. | |
429 *bits |= 0x00000100; | |
430 return false; | |
431 } | |
432 | |
433 if (!is_external_suspend()) { | |
434 // Suspend request is cancelled. This is always checked before | |
435 // is_ext_suspended() to reduce the risk of a rogue resume | |
436 // confusing the thread that made the suspend request. | |
437 *bits |= 0x00000200; | |
438 return false; | |
439 } | |
440 | |
441 if (is_ext_suspended()) { | |
442 // thread is suspended | |
443 *bits |= 0x00000400; | |
444 return true; | |
445 } | |
446 | |
447 // Now that we no longer do hard suspends of threads running | |
448 // native code, the target thread can be changing thread state | |
449 // while we are in this routine: | |
450 // | |
451 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
452 // | |
453 // We save a copy of the thread state as observed at this moment | |
454 // and make our decision about suspend completeness based on the | |
455 // copy. This closes the race where the thread state is seen as | |
456 // _thread_in_native_trans in the if-thread_blocked check, but is | |
457 // seen as _thread_blocked in if-thread_in_native_trans check. | |
458 JavaThreadState save_state = thread_state(); | |
459 | |
460 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
461 // If the thread's state is _thread_blocked and this blocking | |
462 // condition is known to be equivalent to a suspend, then we can | |
463 // consider the thread to be externally suspended. This means that | |
464 // the code that sets _thread_blocked has been modified to do | |
465 // self-suspension if the blocking condition releases. We also | |
466 // used to check for CONDVAR_WAIT here, but that is now covered by | |
467 // the _thread_blocked with self-suspension check. | |
468 // | |
469 // Return true since we wouldn't be here unless there was still an | |
470 // external suspend request. | |
471 *bits |= 0x00001000; | |
472 return true; | |
473 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
474 // Threads running native code will self-suspend on native==>VM/Java | |
475 // transitions. If its stack is walkable (should always be the case | |
476 // unless this function is called before the actual java_suspend() | |
477 // call), then the wait is done. | |
478 *bits |= 0x00002000; | |
479 return true; | |
480 } else if (!called_by_wait && !did_trans_retry && | |
481 save_state == _thread_in_native_trans && | |
482 frame_anchor()->walkable()) { | |
483 // The thread is transitioning from thread_in_native to another | |
484 // thread state. check_safepoint_and_suspend_for_native_trans() | |
485 // will force the thread to self-suspend. If it hasn't gotten | |
486 // there yet we may have caught the thread in-between the native | |
487 // code check above and the self-suspend. Lucky us. If we were | |
488 // called by wait_for_ext_suspend_completion(), then it | |
489 // will be doing the retries so we don't have to. | |
490 // | |
491 // Since we use the saved thread state in the if-statement above, | |
492 // there is a chance that the thread has already transitioned to | |
493 // _thread_blocked by the time we get here. In that case, we will | |
494 // make a single unnecessary pass through the logic below. This | |
495 // doesn't hurt anything since we still do the trans retry. | |
496 | |
497 *bits |= 0x00004000; | |
498 | |
499 // Once the thread leaves thread_in_native_trans for another | |
500 // thread state, we break out of this retry loop. We shouldn't | |
501 // need this flag to prevent us from getting back here, but | |
502 // sometimes paranoia is good. | |
503 did_trans_retry = true; | |
504 | |
505 // We wait for the thread to transition to a more usable state. | |
506 for (int i = 1; i <= SuspendRetryCount; i++) { | |
507 // We used to do an "os::yield_all(i)" call here with the intention | |
508 // that yielding would increase on each retry. However, the parameter | |
509 // is ignored on Linux which means the yield didn't scale up. Waiting | |
510 // on the SR_lock below provides a much more predictable scale up for | |
511 // the delay. It also provides a simple/direct point to check for any | |
512 // safepoint requests from the VMThread | |
513 | |
514 // temporarily drops SR_lock while doing wait with safepoint check | |
515 // (if we're a JavaThread - the WatcherThread can also call this) | |
516 // and increase delay with each retry | |
517 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
518 | |
519 // check the actual thread state instead of what we saved above | |
520 if (thread_state() != _thread_in_native_trans) { | |
521 // the thread has transitioned to another thread state so | |
522 // try all the checks (except this one) one more time. | |
523 do_trans_retry = true; | |
524 break; | |
525 } | |
526 } // end retry loop | |
527 | |
528 | |
529 } | |
530 } while (do_trans_retry); | |
531 | |
532 *bits |= 0x00000010; | |
533 return false; | |
534 } | |
535 | |
536 // | |
537 // Wait for an external suspend request to complete (or be cancelled). | |
538 // Returns true if the thread is externally suspended and false otherwise. | |
539 // | |
540 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
541 uint32_t *bits) { | |
542 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
543 false /* !called_by_wait */, bits); | |
544 | |
545 // local flag copies to minimize SR_lock hold time | |
546 bool is_suspended; | |
547 bool pending; | |
548 uint32_t reset_bits; | |
549 | |
550 // set a marker so is_ext_suspend_completed() knows we are the caller | |
551 *bits |= 0x00010000; | |
552 | |
553 // We use reset_bits to reinitialize the bits value at the top of | |
554 // each retry loop. This allows the caller to make use of any | |
555 // unused bits for their own marking purposes. | |
556 reset_bits = *bits; | |
557 | |
558 { | |
559 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
560 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
561 delay, bits); | |
562 pending = is_external_suspend(); | |
563 } | |
564 // must release SR_lock to allow suspension to complete | |
565 | |
566 if (!pending) { | |
567 // A cancelled suspend request is the only false return from | |
568 // is_ext_suspend_completed() that keeps us from entering the | |
569 // retry loop. | |
570 *bits |= 0x00020000; | |
571 return false; | |
572 } | |
573 | |
574 if (is_suspended) { | |
575 *bits |= 0x00040000; | |
576 return true; | |
577 } | |
578 | |
579 for (int i = 1; i <= retries; i++) { | |
580 *bits = reset_bits; // reinit to only track last retry | |
581 | |
582 // We used to do an "os::yield_all(i)" call here with the intention | |
583 // that yielding would increase on each retry. However, the parameter | |
584 // is ignored on Linux which means the yield didn't scale up. Waiting | |
585 // on the SR_lock below provides a much more predictable scale up for | |
586 // the delay. It also provides a simple/direct point to check for any | |
587 // safepoint requests from the VMThread | |
588 | |
589 { | |
590 MutexLocker ml(SR_lock()); | |
591 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
592 // can also call this) and increase delay with each retry | |
593 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
594 | |
595 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
596 delay, bits); | |
597 | |
598 // It is possible for the external suspend request to be cancelled | |
599 // (by a resume) before the actual suspend operation is completed. | |
600 // Refresh our local copy to see if we still need to wait. | |
601 pending = is_external_suspend(); | |
602 } | |
603 | |
604 if (!pending) { | |
605 // A cancelled suspend request is the only false return from | |
606 // is_ext_suspend_completed() that keeps us from staying in the | |
607 // retry loop. | |
608 *bits |= 0x00080000; | |
609 return false; | |
610 } | |
611 | |
612 if (is_suspended) { | |
613 *bits |= 0x00100000; | |
614 return true; | |
615 } | |
616 } // end retry loop | |
617 | |
618 // thread did not suspend after all our retries | |
619 *bits |= 0x00200000; | |
620 return false; | |
621 } | |
622 | |
623 #ifndef PRODUCT | |
624 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
625 | |
626 // This should not need to be atomic as the only way for simultaneous | |
627 // updates is via interrupts. Even then this should be rare or non-existant | |
628 // and we don't care that much anyway. | |
629 | |
630 int index = _jmp_ring_index; | |
631 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
632 _jmp_ring[index]._target = (intptr_t) target; | |
633 _jmp_ring[index]._instruction = (intptr_t) instr; | |
634 _jmp_ring[index]._file = file; | |
635 _jmp_ring[index]._line = line; | |
636 } | |
637 #endif /* PRODUCT */ | |
638 | |
639 // Called by flat profiler | |
640 // Callers have already called wait_for_ext_suspend_completion | |
641 // The assertion for that is currently too complex to put here: | |
642 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
643 bool gotframe = false; | |
644 // self suspension saves needed state. | |
645 if (has_last_Java_frame() && _anchor.walkable()) { | |
646 *_fr = pd_last_frame(); | |
647 gotframe = true; | |
648 } | |
649 return gotframe; | |
650 } | |
651 | |
652 void Thread::interrupt(Thread* thread) { | |
653 trace("interrupt", thread); | |
654 debug_only(check_for_dangling_thread_pointer(thread);) | |
655 os::interrupt(thread); | |
656 } | |
657 | |
658 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
659 trace("is_interrupted", thread); | |
660 debug_only(check_for_dangling_thread_pointer(thread);) | |
661 // Note: If clear_interrupted==false, this simply fetches and | |
662 // returns the value of the field osthread()->interrupted(). | |
663 return os::is_interrupted(thread, clear_interrupted); | |
664 } | |
665 | |
666 | |
667 // GC Support | |
668 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
669 jint thread_parity = _oops_do_parity; | |
670 if (thread_parity != strong_roots_parity) { | |
671 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
672 if (res == thread_parity) return true; | |
673 else { | |
674 guarantee(res == strong_roots_parity, "Or else what?"); | |
675 assert(SharedHeap::heap()->n_par_threads() > 0, | |
676 "Should only fail when parallel."); | |
677 return false; | |
678 } | |
679 } | |
680 assert(SharedHeap::heap()->n_par_threads() > 0, | |
681 "Should only fail when parallel."); | |
682 return false; | |
683 } | |
684 | |
685 void Thread::oops_do(OopClosure* f) { | |
686 active_handles()->oops_do(f); | |
687 // Do oop for ThreadShadow | |
688 f->do_oop((oop*)&_pending_exception); | |
689 handle_area()->oops_do(f); | |
690 } | |
691 | |
692 void Thread::nmethods_do() { | |
693 } | |
694 | |
695 void Thread::print_on(outputStream* st) const { | |
696 // get_priority assumes osthread initialized | |
697 if (osthread() != NULL) { | |
698 st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this); | |
699 osthread()->print_on(st); | |
700 } | |
701 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
702 } | |
703 | |
704 // Thread::print_on_error() is called by fatal error handler. Don't use | |
705 // any lock or allocate memory. | |
706 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
707 if (is_VM_thread()) st->print("VMThread"); | |
708 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
709 else if (is_Java_thread()) st->print("JavaThread"); | |
710 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
711 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
712 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
713 else st->print("Thread"); | |
714 | |
715 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
716 _stack_base - _stack_size, _stack_base); | |
717 | |
718 if (osthread()) { | |
719 st->print(" [id=%d]", osthread()->thread_id()); | |
720 } | |
721 } | |
722 | |
723 #ifdef ASSERT | |
724 void Thread::print_owned_locks_on(outputStream* st) const { | |
725 Monitor *cur = _owned_locks; | |
726 if (cur == NULL) { | |
727 st->print(" (no locks) "); | |
728 } else { | |
729 st->print_cr(" Locks owned:"); | |
730 while(cur) { | |
731 cur->print_on(st); | |
732 cur = cur->next(); | |
733 } | |
734 } | |
735 } | |
736 | |
737 static int ref_use_count = 0; | |
738 | |
739 bool Thread::owns_locks_but_compiled_lock() const { | |
740 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
741 if (cur != Compile_lock) return true; | |
742 } | |
743 return false; | |
744 } | |
745 | |
746 | |
747 #endif | |
748 | |
749 #ifndef PRODUCT | |
750 | |
751 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
752 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
753 // no threads which allow_vm_block's are held | |
754 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
755 // Check if current thread is allowed to block at a safepoint | |
756 if (!(_allow_safepoint_count == 0)) | |
757 fatal("Possible safepoint reached by thread that does not allow it"); | |
758 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
759 fatal("LEAF method calling lock?"); | |
760 } | |
761 | |
762 #ifdef ASSERT | |
763 if (potential_vm_operation && is_Java_thread() | |
764 && !Universe::is_bootstrapping()) { | |
765 // Make sure we do not hold any locks that the VM thread also uses. | |
766 // This could potentially lead to deadlocks | |
767 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
768 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
769 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
770 // since it is used to transfer control between JavaThreads and the VMThread | |
771 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
772 if ( (cur->allow_vm_block() && | |
773 cur != Threads_lock && | |
774 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
775 cur != VMOperationRequest_lock && | |
776 cur != VMOperationQueue_lock) || | |
777 cur->rank() == Mutex::special) { | |
778 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
779 } | |
780 } | |
781 } | |
782 | |
783 if (GCALotAtAllSafepoints) { | |
784 // We could enter a safepoint here and thus have a gc | |
785 InterfaceSupport::check_gc_alot(); | |
786 } | |
787 | |
788 #endif | |
789 } | |
790 #endif | |
791 | |
792 bool Thread::is_in_stack(address adr) const { | |
793 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
794 address end = os::current_stack_pointer(); | |
795 if (stack_base() >= adr && adr >= end) return true; | |
796 | |
797 return false; | |
798 } | |
799 | |
800 | |
801 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
802 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
803 // used for compilation in the future. If that change is made, the need for these methods | |
804 // should be revisited, and they should be removed if possible. | |
805 | |
806 bool Thread::is_lock_owned(address adr) const { | |
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807 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); |
0 | 808 } |
809 | |
810 bool Thread::set_as_starting_thread() { | |
811 // NOTE: this must be called inside the main thread. | |
812 return os::create_main_thread((JavaThread*)this); | |
813 } | |
814 | |
815 static void initialize_class(symbolHandle class_name, TRAPS) { | |
816 klassOop klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); | |
817 instanceKlass::cast(klass)->initialize(CHECK); | |
818 } | |
819 | |
820 | |
821 // Creates the initial ThreadGroup | |
822 static Handle create_initial_thread_group(TRAPS) { | |
823 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_ThreadGroup(), true, CHECK_NH); | |
824 instanceKlassHandle klass (THREAD, k); | |
825 | |
826 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
827 { | |
828 JavaValue result(T_VOID); | |
829 JavaCalls::call_special(&result, | |
830 system_instance, | |
831 klass, | |
832 vmSymbolHandles::object_initializer_name(), | |
833 vmSymbolHandles::void_method_signature(), | |
834 CHECK_NH); | |
835 } | |
836 Universe::set_system_thread_group(system_instance()); | |
837 | |
838 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
839 { | |
840 JavaValue result(T_VOID); | |
841 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
842 JavaCalls::call_special(&result, | |
843 main_instance, | |
844 klass, | |
845 vmSymbolHandles::object_initializer_name(), | |
846 vmSymbolHandles::threadgroup_string_void_signature(), | |
847 system_instance, | |
848 string, | |
849 CHECK_NH); | |
850 } | |
851 return main_instance; | |
852 } | |
853 | |
854 // Creates the initial Thread | |
855 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
856 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK_NULL); | |
857 instanceKlassHandle klass (THREAD, k); | |
858 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
859 | |
860 java_lang_Thread::set_thread(thread_oop(), thread); | |
861 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
862 thread->set_threadObj(thread_oop()); | |
863 | |
864 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
865 | |
866 JavaValue result(T_VOID); | |
867 JavaCalls::call_special(&result, thread_oop, | |
868 klass, | |
869 vmSymbolHandles::object_initializer_name(), | |
870 vmSymbolHandles::threadgroup_string_void_signature(), | |
871 thread_group, | |
872 string, | |
873 CHECK_NULL); | |
874 return thread_oop(); | |
875 } | |
876 | |
877 static void call_initializeSystemClass(TRAPS) { | |
878 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_System(), true, CHECK); | |
879 instanceKlassHandle klass (THREAD, k); | |
880 | |
881 JavaValue result(T_VOID); | |
882 JavaCalls::call_static(&result, klass, vmSymbolHandles::initializeSystemClass_name(), | |
883 vmSymbolHandles::void_method_signature(), CHECK); | |
884 } | |
885 | |
886 static void reset_vm_info_property(TRAPS) { | |
887 // the vm info string | |
888 ResourceMark rm(THREAD); | |
889 const char *vm_info = VM_Version::vm_info_string(); | |
890 | |
891 // java.lang.System class | |
892 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_System(), true, CHECK); | |
893 instanceKlassHandle klass (THREAD, k); | |
894 | |
895 // setProperty arguments | |
896 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
897 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
898 | |
899 // return value | |
900 JavaValue r(T_OBJECT); | |
901 | |
902 // public static String setProperty(String key, String value); | |
903 JavaCalls::call_static(&r, | |
904 klass, | |
905 vmSymbolHandles::setProperty_name(), | |
906 vmSymbolHandles::string_string_string_signature(), | |
907 key_str, | |
908 value_str, | |
909 CHECK); | |
910 } | |
911 | |
912 | |
913 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
914 assert(thread_group.not_null(), "thread group should be specified"); | |
915 assert(threadObj() == NULL, "should only create Java thread object once"); | |
916 | |
917 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK); | |
918 instanceKlassHandle klass (THREAD, k); | |
919 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
920 | |
921 java_lang_Thread::set_thread(thread_oop(), this); | |
922 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
923 set_threadObj(thread_oop()); | |
924 | |
925 JavaValue result(T_VOID); | |
926 if (thread_name != NULL) { | |
927 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
928 // Thread gets assigned specified name and null target | |
929 JavaCalls::call_special(&result, | |
930 thread_oop, | |
931 klass, | |
932 vmSymbolHandles::object_initializer_name(), | |
933 vmSymbolHandles::threadgroup_string_void_signature(), | |
934 thread_group, // Argument 1 | |
935 name, // Argument 2 | |
936 THREAD); | |
937 } else { | |
938 // Thread gets assigned name "Thread-nnn" and null target | |
939 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
940 JavaCalls::call_special(&result, | |
941 thread_oop, | |
942 klass, | |
943 vmSymbolHandles::object_initializer_name(), | |
944 vmSymbolHandles::threadgroup_runnable_void_signature(), | |
945 thread_group, // Argument 1 | |
946 Handle(), // Argument 2 | |
947 THREAD); | |
948 } | |
949 | |
950 | |
951 if (daemon) { | |
952 java_lang_Thread::set_daemon(thread_oop()); | |
953 } | |
954 | |
955 if (HAS_PENDING_EXCEPTION) { | |
956 return; | |
957 } | |
958 | |
959 KlassHandle group(this, SystemDictionary::threadGroup_klass()); | |
960 Handle threadObj(this, this->threadObj()); | |
961 | |
962 JavaCalls::call_special(&result, | |
963 thread_group, | |
964 group, | |
965 vmSymbolHandles::add_method_name(), | |
966 vmSymbolHandles::thread_void_signature(), | |
967 threadObj, // Arg 1 | |
968 THREAD); | |
969 | |
970 | |
971 } | |
972 | |
973 // NamedThread -- non-JavaThread subclasses with multiple | |
974 // uniquely named instances should derive from this. | |
975 NamedThread::NamedThread() : Thread() { | |
976 _name = NULL; | |
977 } | |
978 | |
979 NamedThread::~NamedThread() { | |
980 if (_name != NULL) { | |
981 FREE_C_HEAP_ARRAY(char, _name); | |
982 _name = NULL; | |
983 } | |
984 } | |
985 | |
986 void NamedThread::set_name(const char* format, ...) { | |
987 guarantee(_name == NULL, "Only get to set name once."); | |
988 _name = NEW_C_HEAP_ARRAY(char, max_name_len); | |
989 guarantee(_name != NULL, "alloc failure"); | |
990 va_list ap; | |
991 va_start(ap, format); | |
992 jio_vsnprintf(_name, max_name_len, format, ap); | |
993 va_end(ap); | |
994 } | |
995 | |
996 // ======= WatcherThread ======== | |
997 | |
998 // The watcher thread exists to simulate timer interrupts. It should | |
999 // be replaced by an abstraction over whatever native support for | |
1000 // timer interrupts exists on the platform. | |
1001 | |
1002 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
1003 bool WatcherThread::_should_terminate = false; | |
1004 | |
1005 WatcherThread::WatcherThread() : Thread() { | |
1006 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
1007 if (os::create_thread(this, os::watcher_thread)) { | |
1008 _watcher_thread = this; | |
1009 | |
1010 // Set the watcher thread to the highest OS priority which should not be | |
1011 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1012 // is created. The only normal thread using this priority is the reference | |
1013 // handler thread, which runs for very short intervals only. | |
1014 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1015 // will be inaccurate. | |
1016 os::set_priority(this, MaxPriority); | |
1017 if (!DisableStartThread) { | |
1018 os::start_thread(this); | |
1019 } | |
1020 } | |
1021 } | |
1022 | |
1023 void WatcherThread::run() { | |
1024 assert(this == watcher_thread(), "just checking"); | |
1025 | |
1026 this->record_stack_base_and_size(); | |
1027 this->initialize_thread_local_storage(); | |
1028 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1029 while(!_should_terminate) { | |
1030 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1031 assert(watcher_thread() == this, "thread consistency check"); | |
1032 | |
1033 // Calculate how long it'll be until the next PeriodicTask work | |
1034 // should be done, and sleep that amount of time. | |
1035 const size_t time_to_wait = PeriodicTask::time_to_wait(); | |
1036 os::sleep(this, time_to_wait, false); | |
1037 | |
1038 if (is_error_reported()) { | |
1039 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1040 // should abort JVM after creating an error log file. However in some | |
1041 // rare cases, the error handler itself might deadlock. Here we try to | |
1042 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1043 // | |
1044 // This code is in WatcherThread because WatcherThread wakes up | |
1045 // periodically so the fatal error handler doesn't need to do anything; | |
1046 // also because the WatcherThread is less likely to crash than other | |
1047 // threads. | |
1048 | |
1049 for (;;) { | |
1050 if (!ShowMessageBoxOnError | |
1051 && (OnError == NULL || OnError[0] == '\0') | |
1052 && Arguments::abort_hook() == NULL) { | |
1053 os::sleep(this, 2 * 60 * 1000, false); | |
1054 fdStream err(defaultStream::output_fd()); | |
1055 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1056 // skip atexit/vm_exit/vm_abort hooks | |
1057 os::die(); | |
1058 } | |
1059 | |
1060 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1061 // ShowMessageBoxOnError when it is ready to abort. | |
1062 os::sleep(this, 5 * 1000, false); | |
1063 } | |
1064 } | |
1065 | |
1066 PeriodicTask::real_time_tick(time_to_wait); | |
1067 | |
1068 // If we have no more tasks left due to dynamic disenrollment, | |
1069 // shut down the thread since we don't currently support dynamic enrollment | |
1070 if (PeriodicTask::num_tasks() == 0) { | |
1071 _should_terminate = true; | |
1072 } | |
1073 } | |
1074 | |
1075 // Signal that it is terminated | |
1076 { | |
1077 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1078 _watcher_thread = NULL; | |
1079 Terminator_lock->notify(); | |
1080 } | |
1081 | |
1082 // Thread destructor usually does this.. | |
1083 ThreadLocalStorage::set_thread(NULL); | |
1084 } | |
1085 | |
1086 void WatcherThread::start() { | |
1087 if (watcher_thread() == NULL) { | |
1088 _should_terminate = false; | |
1089 // Create the single instance of WatcherThread | |
1090 new WatcherThread(); | |
1091 } | |
1092 } | |
1093 | |
1094 void WatcherThread::stop() { | |
1095 // it is ok to take late safepoints here, if needed | |
1096 MutexLocker mu(Terminator_lock); | |
1097 _should_terminate = true; | |
1098 while(watcher_thread() != NULL) { | |
1099 // This wait should make safepoint checks, wait without a timeout, | |
1100 // and wait as a suspend-equivalent condition. | |
1101 // | |
1102 // Note: If the FlatProfiler is running, then this thread is waiting | |
1103 // for the WatcherThread to terminate and the WatcherThread, via the | |
1104 // FlatProfiler task, is waiting for the external suspend request on | |
1105 // this thread to complete. wait_for_ext_suspend_completion() will | |
1106 // eventually timeout, but that takes time. Making this wait a | |
1107 // suspend-equivalent condition solves that timeout problem. | |
1108 // | |
1109 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1110 Mutex::_as_suspend_equivalent_flag); | |
1111 } | |
1112 } | |
1113 | |
1114 void WatcherThread::print_on(outputStream* st) const { | |
1115 st->print("\"%s\" ", name()); | |
1116 Thread::print_on(st); | |
1117 st->cr(); | |
1118 } | |
1119 | |
1120 // ======= JavaThread ======== | |
1121 | |
1122 // A JavaThread is a normal Java thread | |
1123 | |
1124 void JavaThread::initialize() { | |
1125 // Initialize fields | |
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1127 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1128 set_claimed_par_id(-1); |
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1129 |
0 | 1130 set_saved_exception_pc(NULL); |
1131 set_threadObj(NULL); | |
1132 _anchor.clear(); | |
1133 set_entry_point(NULL); | |
1134 set_jni_functions(jni_functions()); | |
1135 set_callee_target(NULL); | |
1136 set_vm_result(NULL); | |
1137 set_vm_result_2(NULL); | |
1138 set_vframe_array_head(NULL); | |
1139 set_vframe_array_last(NULL); | |
1140 set_deferred_locals(NULL); | |
1141 set_deopt_mark(NULL); | |
1142 clear_must_deopt_id(); | |
1143 set_monitor_chunks(NULL); | |
1144 set_next(NULL); | |
1145 set_thread_state(_thread_new); | |
1146 _terminated = _not_terminated; | |
1147 _privileged_stack_top = NULL; | |
1148 _array_for_gc = NULL; | |
1149 _suspend_equivalent = false; | |
1150 _in_deopt_handler = 0; | |
1151 _doing_unsafe_access = false; | |
1152 _stack_guard_state = stack_guard_unused; | |
1153 _exception_oop = NULL; | |
1154 _exception_pc = 0; | |
1155 _exception_handler_pc = 0; | |
1156 _exception_stack_size = 0; | |
1157 _jvmti_thread_state= NULL; | |
1158 _jvmti_get_loaded_classes_closure = NULL; | |
1159 _interp_only_mode = 0; | |
1160 _special_runtime_exit_condition = _no_async_condition; | |
1161 _pending_async_exception = NULL; | |
1162 _is_compiling = false; | |
1163 _thread_stat = NULL; | |
1164 _thread_stat = new ThreadStatistics(); | |
1165 _blocked_on_compilation = false; | |
1166 _jni_active_critical = 0; | |
1167 _do_not_unlock_if_synchronized = false; | |
1168 _cached_monitor_info = NULL; | |
1169 _parker = Parker::Allocate(this) ; | |
1170 | |
1171 #ifndef PRODUCT | |
1172 _jmp_ring_index = 0; | |
1173 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1174 record_jump(NULL, NULL, NULL, 0); | |
1175 } | |
1176 #endif /* PRODUCT */ | |
1177 | |
1178 set_thread_profiler(NULL); | |
1179 if (FlatProfiler::is_active()) { | |
1180 // This is where we would decide to either give each thread it's own profiler | |
1181 // or use one global one from FlatProfiler, | |
1182 // or up to some count of the number of profiled threads, etc. | |
1183 ThreadProfiler* pp = new ThreadProfiler(); | |
1184 pp->engage(); | |
1185 set_thread_profiler(pp); | |
1186 } | |
1187 | |
1188 // Setup safepoint state info for this thread | |
1189 ThreadSafepointState::create(this); | |
1190 | |
1191 debug_only(_java_call_counter = 0); | |
1192 | |
1193 // JVMTI PopFrame support | |
1194 _popframe_condition = popframe_inactive; | |
1195 _popframe_preserved_args = NULL; | |
1196 _popframe_preserved_args_size = 0; | |
1197 | |
1198 pd_initialize(); | |
1199 } | |
1200 | |
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1201 #ifndef SERIALGC |
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1202 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1203 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1204 #endif // !SERIALGC |
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1205 |
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1206 JavaThread::JavaThread(bool is_attaching) : |
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1207 Thread() |
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1208 #ifndef SERIALGC |
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1209 , _satb_mark_queue(&_satb_mark_queue_set), |
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1210 _dirty_card_queue(&_dirty_card_queue_set) |
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1211 #endif // !SERIALGC |
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1212 { |
0 | 1213 initialize(); |
1214 _is_attaching = is_attaching; | |
1215 } | |
1216 | |
1217 bool JavaThread::reguard_stack(address cur_sp) { | |
1218 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1219 return true; // Stack already guarded or guard pages not needed. | |
1220 } | |
1221 | |
1222 if (register_stack_overflow()) { | |
1223 // For those architectures which have separate register and | |
1224 // memory stacks, we must check the register stack to see if | |
1225 // it has overflowed. | |
1226 return false; | |
1227 } | |
1228 | |
1229 // Java code never executes within the yellow zone: the latter is only | |
1230 // there to provoke an exception during stack banging. If java code | |
1231 // is executing there, either StackShadowPages should be larger, or | |
1232 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1233 // when it should. | |
1234 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1235 | |
1236 enable_stack_yellow_zone(); | |
1237 return true; | |
1238 } | |
1239 | |
1240 bool JavaThread::reguard_stack(void) { | |
1241 return reguard_stack(os::current_stack_pointer()); | |
1242 } | |
1243 | |
1244 | |
1245 void JavaThread::block_if_vm_exited() { | |
1246 if (_terminated == _vm_exited) { | |
1247 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1248 // we will block here forever | |
1249 Threads_lock->lock_without_safepoint_check(); | |
1250 ShouldNotReachHere(); | |
1251 } | |
1252 } | |
1253 | |
1254 | |
1255 // Remove this ifdef when C1 is ported to the compiler interface. | |
1256 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1257 | |
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1258 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1259 Thread() |
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1260 #ifndef SERIALGC |
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1261 , _satb_mark_queue(&_satb_mark_queue_set), |
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1262 _dirty_card_queue(&_dirty_card_queue_set) |
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1263 #endif // !SERIALGC |
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1264 { |
0 | 1265 if (TraceThreadEvents) { |
1266 tty->print_cr("creating thread %p", this); | |
1267 } | |
1268 initialize(); | |
1269 _is_attaching = false; | |
1270 set_entry_point(entry_point); | |
1271 // Create the native thread itself. | |
1272 // %note runtime_23 | |
1273 os::ThreadType thr_type = os::java_thread; | |
1274 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1275 os::java_thread; | |
1276 os::create_thread(this, thr_type, stack_sz); | |
1277 | |
1278 // The _osthread may be NULL here because we ran out of memory (too many threads active). | |
1279 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1280 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1281 // the exception consists of creating the exception object & initializing it, initialization | |
1282 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1283 // | |
1284 // The thread is still suspended when we reach here. Thread must be explicit started | |
1285 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1286 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1287 // object must be fully initialized (take a look at JVM_Start) | |
1288 } | |
1289 | |
1290 JavaThread::~JavaThread() { | |
1291 if (TraceThreadEvents) { | |
1292 tty->print_cr("terminate thread %p", this); | |
1293 } | |
1294 | |
1295 // JSR166 -- return the parker to the free list | |
1296 Parker::Release(_parker); | |
1297 _parker = NULL ; | |
1298 | |
1299 // Free any remaining previous UnrollBlock | |
1300 vframeArray* old_array = vframe_array_last(); | |
1301 | |
1302 if (old_array != NULL) { | |
1303 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1304 old_array->set_unroll_block(NULL); | |
1305 delete old_info; | |
1306 delete old_array; | |
1307 } | |
1308 | |
1309 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1310 if (deferred != NULL) { | |
1311 // This can only happen if thread is destroyed before deoptimization occurs. | |
1312 assert(deferred->length() != 0, "empty array!"); | |
1313 do { | |
1314 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1315 deferred->remove_at(0); | |
1316 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1317 delete dlv; | |
1318 } while (deferred->length() != 0); | |
1319 delete deferred; | |
1320 } | |
1321 | |
1322 // All Java related clean up happens in exit | |
1323 ThreadSafepointState::destroy(this); | |
1324 if (_thread_profiler != NULL) delete _thread_profiler; | |
1325 if (_thread_stat != NULL) delete _thread_stat; | |
1326 } | |
1327 | |
1328 | |
1329 // The first routine called by a new Java thread | |
1330 void JavaThread::run() { | |
1331 // initialize thread-local alloc buffer related fields | |
1332 this->initialize_tlab(); | |
1333 | |
1334 // used to test validitity of stack trace backs | |
1335 this->record_base_of_stack_pointer(); | |
1336 | |
1337 // Record real stack base and size. | |
1338 this->record_stack_base_and_size(); | |
1339 | |
1340 // Initialize thread local storage; set before calling MutexLocker | |
1341 this->initialize_thread_local_storage(); | |
1342 | |
1343 this->create_stack_guard_pages(); | |
1344 | |
1345 // Thread is now sufficient initialized to be handled by the safepoint code as being | |
1346 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1347 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1348 | |
1349 assert(JavaThread::current() == this, "sanity check"); | |
1350 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1351 | |
1352 DTRACE_THREAD_PROBE(start, this); | |
1353 | |
1354 // This operation might block. We call that after all safepoint checks for a new thread has | |
1355 // been completed. | |
1356 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1357 | |
1358 if (JvmtiExport::should_post_thread_life()) { | |
1359 JvmtiExport::post_thread_start(this); | |
1360 } | |
1361 | |
1362 // We call another function to do the rest so we are sure that the stack addresses used | |
1363 // from there will be lower than the stack base just computed | |
1364 thread_main_inner(); | |
1365 | |
1366 // Note, thread is no longer valid at this point! | |
1367 } | |
1368 | |
1369 | |
1370 void JavaThread::thread_main_inner() { | |
1371 assert(JavaThread::current() == this, "sanity check"); | |
1372 assert(this->threadObj() != NULL, "just checking"); | |
1373 | |
1374 // Execute thread entry point. If this thread is being asked to restart, | |
1375 // or has been stopped before starting, do not reexecute entry point. | |
1376 // Note: Due to JVM_StopThread we can have pending exceptions already! | |
1377 if (!this->has_pending_exception() && !java_lang_Thread::is_stillborn(this->threadObj())) { | |
1378 // enter the thread's entry point only if we have no pending exceptions | |
1379 HandleMark hm(this); | |
1380 this->entry_point()(this, this); | |
1381 } | |
1382 | |
1383 DTRACE_THREAD_PROBE(stop, this); | |
1384 | |
1385 this->exit(false); | |
1386 delete this; | |
1387 } | |
1388 | |
1389 | |
1390 static void ensure_join(JavaThread* thread) { | |
1391 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1392 Handle threadObj(thread, thread->threadObj()); | |
1393 assert(threadObj.not_null(), "java thread object must exist"); | |
1394 ObjectLocker lock(threadObj, thread); | |
1395 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1396 thread->clear_pending_exception(); | |
1397 // It is of profound importance that we set the stillborn bit and reset the thread object, | |
1398 // before we do the notify. Since, changing these two variable will make JVM_IsAlive return | |
1399 // false. So in case another thread is doing a join on this thread , it will detect that the thread | |
1400 // is dead when it gets notified. | |
1401 java_lang_Thread::set_stillborn(threadObj()); | |
1402 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1403 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
1404 java_lang_Thread::set_thread(threadObj(), NULL); | |
1405 lock.notify_all(thread); | |
1406 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1407 thread->clear_pending_exception(); | |
1408 } | |
1409 | |
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1410 |
0 | 1411 // For any new cleanup additions, please check to see if they need to be applied to |
1412 // cleanup_failed_attach_current_thread as well. | |
1413 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
1414 assert(this == JavaThread::current(), "thread consistency check"); | |
1415 if (!InitializeJavaLangSystem) return; | |
1416 | |
1417 HandleMark hm(this); | |
1418 Handle uncaught_exception(this, this->pending_exception()); | |
1419 this->clear_pending_exception(); | |
1420 Handle threadObj(this, this->threadObj()); | |
1421 assert(threadObj.not_null(), "Java thread object should be created"); | |
1422 | |
1423 if (get_thread_profiler() != NULL) { | |
1424 get_thread_profiler()->disengage(); | |
1425 ResourceMark rm; | |
1426 get_thread_profiler()->print(get_thread_name()); | |
1427 } | |
1428 | |
1429 | |
1430 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
1431 { | |
1432 EXCEPTION_MARK; | |
1433 | |
1434 CLEAR_PENDING_EXCEPTION; | |
1435 } | |
1436 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
1437 // has to be fixed by a runtime query method | |
1438 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
1439 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
1440 // java.lang.Thread.dispatchUncaughtException | |
1441 if (uncaught_exception.not_null()) { | |
1442 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
1443 Events::log("uncaught exception INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT", | |
1444 (address)uncaught_exception(), (address)threadObj(), (address)group()); | |
1445 { | |
1446 EXCEPTION_MARK; | |
1447 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
1448 // call it. Otherwise we have an older library without the JSR-166 changes, | |
1449 // so call ThreadGroup.uncaughtException() | |
1450 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
1451 CallInfo callinfo; | |
1452 KlassHandle thread_klass(THREAD, SystemDictionary::thread_klass()); | |
1453 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, | |
1454 vmSymbolHandles::dispatchUncaughtException_name(), | |
1455 vmSymbolHandles::throwable_void_signature(), | |
1456 KlassHandle(), false, false, THREAD); | |
1457 CLEAR_PENDING_EXCEPTION; | |
1458 methodHandle method = callinfo.selected_method(); | |
1459 if (method.not_null()) { | |
1460 JavaValue result(T_VOID); | |
1461 JavaCalls::call_virtual(&result, | |
1462 threadObj, thread_klass, | |
1463 vmSymbolHandles::dispatchUncaughtException_name(), | |
1464 vmSymbolHandles::throwable_void_signature(), | |
1465 uncaught_exception, | |
1466 THREAD); | |
1467 } else { | |
1468 KlassHandle thread_group(THREAD, SystemDictionary::threadGroup_klass()); | |
1469 JavaValue result(T_VOID); | |
1470 JavaCalls::call_virtual(&result, | |
1471 group, thread_group, | |
1472 vmSymbolHandles::uncaughtException_name(), | |
1473 vmSymbolHandles::thread_throwable_void_signature(), | |
1474 threadObj, // Arg 1 | |
1475 uncaught_exception, // Arg 2 | |
1476 THREAD); | |
1477 } | |
1478 CLEAR_PENDING_EXCEPTION; | |
1479 } | |
1480 } | |
1481 | |
1482 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during | |
1483 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1484 // is deprecated anyhow. | |
1485 { int count = 3; | |
1486 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
1487 EXCEPTION_MARK; | |
1488 JavaValue result(T_VOID); | |
1489 KlassHandle thread_klass(THREAD, SystemDictionary::thread_klass()); | |
1490 JavaCalls::call_virtual(&result, | |
1491 threadObj, thread_klass, | |
1492 vmSymbolHandles::exit_method_name(), | |
1493 vmSymbolHandles::void_method_signature(), | |
1494 THREAD); | |
1495 CLEAR_PENDING_EXCEPTION; | |
1496 } | |
1497 } | |
1498 | |
1499 // notify JVMTI | |
1500 if (JvmtiExport::should_post_thread_life()) { | |
1501 JvmtiExport::post_thread_end(this); | |
1502 } | |
1503 | |
1504 // We have notified the agents that we are exiting, before we go on, | |
1505 // we must check for a pending external suspend request and honor it | |
1506 // in order to not surprise the thread that made the suspend request. | |
1507 while (true) { | |
1508 { | |
1509 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1510 if (!is_external_suspend()) { | |
1511 set_terminated(_thread_exiting); | |
1512 ThreadService::current_thread_exiting(this); | |
1513 break; | |
1514 } | |
1515 // Implied else: | |
1516 // Things get a little tricky here. We have a pending external | |
1517 // suspend request, but we are holding the SR_lock so we | |
1518 // can't just self-suspend. So we temporarily drop the lock | |
1519 // and then self-suspend. | |
1520 } | |
1521 | |
1522 ThreadBlockInVM tbivm(this); | |
1523 java_suspend_self(); | |
1524 | |
1525 // We're done with this suspend request, but we have to loop around | |
1526 // and check again. Eventually we will get SR_lock without a pending | |
1527 // external suspend request and will be able to mark ourselves as | |
1528 // exiting. | |
1529 } | |
1530 // no more external suspends are allowed at this point | |
1531 } else { | |
1532 // before_exit() has already posted JVMTI THREAD_END events | |
1533 } | |
1534 | |
1535 // Notify waiters on thread object. This has to be done after exit() is called | |
1536 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1537 // group should have the destroyed bit set before waiters are notified). | |
1538 ensure_join(this); | |
1539 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1540 | |
1541 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1542 // held by this thread must be released. A detach operation must only | |
1543 // get here if there are no Java frames on the stack. Therefore, any | |
1544 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1545 // pre-inflated and in the monitor cache. | |
1546 // | |
1547 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1548 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1549 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1550 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1551 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1552 } | |
1553 | |
1554 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1555 // is in a consistent state, in case GC happens | |
1556 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1557 | |
1558 if (active_handles() != NULL) { | |
1559 JNIHandleBlock* block = active_handles(); | |
1560 set_active_handles(NULL); | |
1561 JNIHandleBlock::release_block(block); | |
1562 } | |
1563 | |
1564 if (free_handle_block() != NULL) { | |
1565 JNIHandleBlock* block = free_handle_block(); | |
1566 set_free_handle_block(NULL); | |
1567 JNIHandleBlock::release_block(block); | |
1568 } | |
1569 | |
1570 // These have to be removed while this is still a valid thread. | |
1571 remove_stack_guard_pages(); | |
1572 | |
1573 if (UseTLAB) { | |
1574 tlab().make_parsable(true); // retire TLAB | |
1575 } | |
1576 | |
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1577 if (jvmti_thread_state() != NULL) { |
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1578 JvmtiExport::cleanup_thread(this); |
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1579 } |
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1580 |
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1581 #ifndef SERIALGC |
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1582 // We must flush G1-related buffers before removing a thread from |
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1583 // the list of active threads. |
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1584 if (UseG1GC) { |
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1585 flush_barrier_queues(); |
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1586 } |
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1587 #endif |
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1588 |
0 | 1589 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1590 Threads::remove(this); | |
1591 } | |
1592 | |
441
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1593 #ifndef SERIALGC |
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1594 // Flush G1-related queues. |
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1595 void JavaThread::flush_barrier_queues() { |
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1596 satb_mark_queue().flush(); |
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1597 dirty_card_queue().flush(); |
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1598 } |
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1599 #endif |
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1600 |
0 | 1601 void JavaThread::cleanup_failed_attach_current_thread() { |
441
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1602 if (get_thread_profiler() != NULL) { |
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1603 get_thread_profiler()->disengage(); |
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1604 ResourceMark rm; |
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1605 get_thread_profiler()->print(get_thread_name()); |
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1606 } |
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1607 |
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1608 if (active_handles() != NULL) { |
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1609 JNIHandleBlock* block = active_handles(); |
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1610 set_active_handles(NULL); |
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1611 JNIHandleBlock::release_block(block); |
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1612 } |
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1613 |
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1614 if (free_handle_block() != NULL) { |
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1615 JNIHandleBlock* block = free_handle_block(); |
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1616 set_free_handle_block(NULL); |
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1617 JNIHandleBlock::release_block(block); |
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1618 } |
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1619 |
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1620 if (UseTLAB) { |
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1621 tlab().make_parsable(true); // retire TLAB, if any |
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1622 } |
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1623 |
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1624 #ifndef SERIALGC |
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1625 if (UseG1GC) { |
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1626 flush_barrier_queues(); |
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1627 } |
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1628 #endif |
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1629 |
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1630 Threads::remove(this); |
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1631 delete this; |
0 | 1632 } |
1633 | |
1634 | |
441
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1635 |
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1636 |
0 | 1637 JavaThread* JavaThread::active() { |
1638 Thread* thread = ThreadLocalStorage::thread(); | |
1639 assert(thread != NULL, "just checking"); | |
1640 if (thread->is_Java_thread()) { | |
1641 return (JavaThread*) thread; | |
1642 } else { | |
1643 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
1644 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
1645 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
1646 assert(ret->is_Java_thread(), "must be a Java thread"); | |
1647 return ret; | |
1648 } | |
1649 } | |
1650 | |
1651 bool JavaThread::is_lock_owned(address adr) const { | |
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1652 if (Thread::is_lock_owned(adr)) return true; |
0 | 1653 |
1654 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
1655 if (chunk->contains(adr)) return true; | |
1656 } | |
1657 | |
1658 return false; | |
1659 } | |
1660 | |
1661 | |
1662 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
1663 chunk->set_next(monitor_chunks()); | |
1664 set_monitor_chunks(chunk); | |
1665 } | |
1666 | |
1667 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
1668 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
1669 if (monitor_chunks() == chunk) { | |
1670 set_monitor_chunks(chunk->next()); | |
1671 } else { | |
1672 MonitorChunk* prev = monitor_chunks(); | |
1673 while (prev->next() != chunk) prev = prev->next(); | |
1674 prev->set_next(chunk->next()); | |
1675 } | |
1676 } | |
1677 | |
1678 // JVM support. | |
1679 | |
1680 // Note: this function shouldn't block if it's called in | |
1681 // _thread_in_native_trans state (such as from | |
1682 // check_special_condition_for_native_trans()). | |
1683 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
1684 | |
1685 if (has_last_Java_frame() && has_async_condition()) { | |
1686 // If we are at a polling page safepoint (not a poll return) | |
1687 // then we must defer async exception because live registers | |
1688 // will be clobbered by the exception path. Poll return is | |
1689 // ok because the call we a returning from already collides | |
1690 // with exception handling registers and so there is no issue. | |
1691 // (The exception handling path kills call result registers but | |
1692 // this is ok since the exception kills the result anyway). | |
1693 | |
1694 if (is_at_poll_safepoint()) { | |
1695 // if the code we are returning to has deoptimized we must defer | |
1696 // the exception otherwise live registers get clobbered on the | |
1697 // exception path before deoptimization is able to retrieve them. | |
1698 // | |
1699 RegisterMap map(this, false); | |
1700 frame caller_fr = last_frame().sender(&map); | |
1701 assert(caller_fr.is_compiled_frame(), "what?"); | |
1702 if (caller_fr.is_deoptimized_frame()) { | |
1703 if (TraceExceptions) { | |
1704 ResourceMark rm; | |
1705 tty->print_cr("deferred async exception at compiled safepoint"); | |
1706 } | |
1707 return; | |
1708 } | |
1709 } | |
1710 } | |
1711 | |
1712 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
1713 if (condition == _no_async_condition) { | |
1714 // Conditions have changed since has_special_runtime_exit_condition() | |
1715 // was called: | |
1716 // - if we were here only because of an external suspend request, | |
1717 // then that was taken care of above (or cancelled) so we are done | |
1718 // - if we were here because of another async request, then it has | |
1719 // been cleared between the has_special_runtime_exit_condition() | |
1720 // and now so again we are done | |
1721 return; | |
1722 } | |
1723 | |
1724 // Check for pending async. exception | |
1725 if (_pending_async_exception != NULL) { | |
1726 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1727 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::threaddeath_klass())) { | |
1728 | |
1729 // We cannot call Exceptions::_throw(...) here because we cannot block | |
1730 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
1731 | |
1732 if (TraceExceptions) { | |
1733 ResourceMark rm; | |
1734 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
1735 if (has_last_Java_frame() ) { | |
1736 frame f = last_frame(); | |
1737 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
1738 } | |
1739 tty->print_cr(" of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
1740 } | |
1741 _pending_async_exception = NULL; | |
1742 clear_has_async_exception(); | |
1743 } | |
1744 } | |
1745 | |
1746 if (check_unsafe_error && | |
1747 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
1748 condition = _no_async_condition; // done | |
1749 switch (thread_state()) { | |
1750 case _thread_in_vm: | |
1751 { | |
1752 JavaThread* THREAD = this; | |
1753 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
1754 } | |
1755 case _thread_in_native: | |
1756 { | |
1757 ThreadInVMfromNative tiv(this); | |
1758 JavaThread* THREAD = this; | |
1759 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
1760 } | |
1761 case _thread_in_Java: | |
1762 { | |
1763 ThreadInVMfromJava tiv(this); | |
1764 JavaThread* THREAD = this; | |
1765 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
1766 } | |
1767 default: | |
1768 ShouldNotReachHere(); | |
1769 } | |
1770 } | |
1771 | |
1772 assert(condition == _no_async_condition || has_pending_exception() || | |
1773 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
1774 "must have handled the async condition, if no exception"); | |
1775 } | |
1776 | |
1777 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
1778 // | |
1779 // Check for pending external suspend. Internal suspend requests do | |
1780 // not use handle_special_runtime_exit_condition(). | |
1781 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
1782 // thread is not the current thread. In older versions of jdbx, jdbx | |
1783 // threads could call into the VM with another thread's JNIEnv so we | |
1784 // can be here operating on behalf of a suspended thread (4432884). | |
1785 bool do_self_suspend = is_external_suspend_with_lock(); | |
1786 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
1787 // | |
1788 // Because thread is external suspended the safepoint code will count | |
1789 // thread as at a safepoint. This can be odd because we can be here | |
1790 // as _thread_in_Java which would normally transition to _thread_blocked | |
1791 // at a safepoint. We would like to mark the thread as _thread_blocked | |
1792 // before calling java_suspend_self like all other callers of it but | |
1793 // we must then observe proper safepoint protocol. (We can't leave | |
1794 // _thread_blocked with a safepoint in progress). However we can be | |
1795 // here as _thread_in_native_trans so we can't use a normal transition | |
1796 // constructor/destructor pair because they assert on that type of | |
1797 // transition. We could do something like: | |
1798 // | |
1799 // JavaThreadState state = thread_state(); | |
1800 // set_thread_state(_thread_in_vm); | |
1801 // { | |
1802 // ThreadBlockInVM tbivm(this); | |
1803 // java_suspend_self() | |
1804 // } | |
1805 // set_thread_state(_thread_in_vm_trans); | |
1806 // if (safepoint) block; | |
1807 // set_thread_state(state); | |
1808 // | |
1809 // but that is pretty messy. Instead we just go with the way the | |
1810 // code has worked before and note that this is the only path to | |
1811 // java_suspend_self that doesn't put the thread in _thread_blocked | |
1812 // mode. | |
1813 | |
1814 frame_anchor()->make_walkable(this); | |
1815 java_suspend_self(); | |
1816 | |
1817 // We might be here for reasons in addition to the self-suspend request | |
1818 // so check for other async requests. | |
1819 } | |
1820 | |
1821 if (check_asyncs) { | |
1822 check_and_handle_async_exceptions(); | |
1823 } | |
1824 } | |
1825 | |
1826 void JavaThread::send_thread_stop(oop java_throwable) { | |
1827 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
1828 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
1829 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
1830 | |
1831 // Do not throw asynchronous exceptions against the compiler thread | |
1832 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
1833 if (is_Compiler_thread()) return; | |
1834 | |
1835 // This is a change from JDK 1.1, but JDK 1.2 will also do it: | |
1836 if (java_throwable->is_a(SystemDictionary::threaddeath_klass())) { | |
1837 java_lang_Thread::set_stillborn(threadObj()); | |
1838 } | |
1839 | |
1840 { | |
1841 // Actually throw the Throwable against the target Thread - however | |
1842 // only if there is no thread death exception installed already. | |
1843 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::threaddeath_klass())) { | |
1844 // If the topmost frame is a runtime stub, then we are calling into | |
1845 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
1846 // must deoptimize the caller before continuing, as the compiled exception handler table | |
1847 // may not be valid | |
1848 if (has_last_Java_frame()) { | |
1849 frame f = last_frame(); | |
1850 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
1851 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
1852 RegisterMap reg_map(this, UseBiasedLocking); | |
1853 frame compiled_frame = f.sender(®_map); | |
1854 if (compiled_frame.can_be_deoptimized()) { | |
1855 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
1856 } | |
1857 } | |
1858 } | |
1859 | |
1860 // Set async. pending exception in thread. | |
1861 set_pending_async_exception(java_throwable); | |
1862 | |
1863 if (TraceExceptions) { | |
1864 ResourceMark rm; | |
1865 tty->print_cr("Pending Async. exception installed of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
1866 } | |
1867 // for AbortVMOnException flag | |
1868 NOT_PRODUCT(Exceptions::debug_check_abort(instanceKlass::cast(_pending_async_exception->klass())->external_name())); | |
1869 } | |
1870 } | |
1871 | |
1872 | |
1873 // Interrupt thread so it will wake up from a potential wait() | |
1874 Thread::interrupt(this); | |
1875 } | |
1876 | |
1877 // External suspension mechanism. | |
1878 // | |
1879 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
1880 // to any VM_locks and it is at a transition | |
1881 // Self-suspension will happen on the transition out of the vm. | |
1882 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
1883 // | |
1884 // Guarantees on return: | |
1885 // + Target thread will not execute any new bytecode (that's why we need to | |
1886 // force a safepoint) | |
1887 // + Target thread will not enter any new monitors | |
1888 // | |
1889 void JavaThread::java_suspend() { | |
1890 { MutexLocker mu(Threads_lock); | |
1891 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
1892 return; | |
1893 } | |
1894 } | |
1895 | |
1896 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1897 if (!is_external_suspend()) { | |
1898 // a racing resume has cancelled us; bail out now | |
1899 return; | |
1900 } | |
1901 | |
1902 // suspend is done | |
1903 uint32_t debug_bits = 0; | |
1904 // Warning: is_ext_suspend_completed() may temporarily drop the | |
1905 // SR_lock to allow the thread to reach a stable thread state if | |
1906 // it is currently in a transient thread state. | |
1907 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
1908 SuspendRetryDelay, &debug_bits) ) { | |
1909 return; | |
1910 } | |
1911 } | |
1912 | |
1913 VM_ForceSafepoint vm_suspend; | |
1914 VMThread::execute(&vm_suspend); | |
1915 } | |
1916 | |
1917 // Part II of external suspension. | |
1918 // A JavaThread self suspends when it detects a pending external suspend | |
1919 // request. This is usually on transitions. It is also done in places | |
1920 // where continuing to the next transition would surprise the caller, | |
1921 // e.g., monitor entry. | |
1922 // | |
1923 // Returns the number of times that the thread self-suspended. | |
1924 // | |
1925 // Note: DO NOT call java_suspend_self() when you just want to block current | |
1926 // thread. java_suspend_self() is the second stage of cooperative | |
1927 // suspension for external suspend requests and should only be used | |
1928 // to complete an external suspend request. | |
1929 // | |
1930 int JavaThread::java_suspend_self() { | |
1931 int ret = 0; | |
1932 | |
1933 // we are in the process of exiting so don't suspend | |
1934 if (is_exiting()) { | |
1935 clear_external_suspend(); | |
1936 return ret; | |
1937 } | |
1938 | |
1939 assert(_anchor.walkable() || | |
1940 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
1941 "must have walkable stack"); | |
1942 | |
1943 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1944 | |
1945 assert(!this->is_any_suspended(), | |
1946 "a thread trying to self-suspend should not already be suspended"); | |
1947 | |
1948 if (this->is_suspend_equivalent()) { | |
1949 // If we are self-suspending as a result of the lifting of a | |
1950 // suspend equivalent condition, then the suspend_equivalent | |
1951 // flag is not cleared until we set the ext_suspended flag so | |
1952 // that wait_for_ext_suspend_completion() returns consistent | |
1953 // results. | |
1954 this->clear_suspend_equivalent(); | |
1955 } | |
1956 | |
1957 // A racing resume may have cancelled us before we grabbed SR_lock | |
1958 // above. Or another external suspend request could be waiting for us | |
1959 // by the time we return from SR_lock()->wait(). The thread | |
1960 // that requested the suspension may already be trying to walk our | |
1961 // stack and if we return now, we can change the stack out from under | |
1962 // it. This would be a "bad thing (TM)" and cause the stack walker | |
1963 // to crash. We stay self-suspended until there are no more pending | |
1964 // external suspend requests. | |
1965 while (is_external_suspend()) { | |
1966 ret++; | |
1967 this->set_ext_suspended(); | |
1968 | |
1969 // _ext_suspended flag is cleared by java_resume() | |
1970 while (is_ext_suspended()) { | |
1971 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
1972 } | |
1973 } | |
1974 | |
1975 return ret; | |
1976 } | |
1977 | |
1978 #ifdef ASSERT | |
1979 // verify the JavaThread has not yet been published in the Threads::list, and | |
1980 // hence doesn't need protection from concurrent access at this stage | |
1981 void JavaThread::verify_not_published() { | |
1982 if (!Threads_lock->owned_by_self()) { | |
1983 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
1984 assert( !Threads::includes(this), | |
1985 "java thread shouldn't have been published yet!"); | |
1986 } | |
1987 else { | |
1988 assert( !Threads::includes(this), | |
1989 "java thread shouldn't have been published yet!"); | |
1990 } | |
1991 } | |
1992 #endif | |
1993 | |
1994 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
1995 // progress or when _suspend_flags is non-zero. | |
1996 // Current thread needs to self-suspend if there is a suspend request and/or | |
1997 // block if a safepoint is in progress. | |
1998 // Async exception ISN'T checked. | |
1999 // Note only the ThreadInVMfromNative transition can call this function | |
2000 // directly and when thread state is _thread_in_native_trans | |
2001 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
2002 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
2003 | |
2004 JavaThread *curJT = JavaThread::current(); | |
2005 bool do_self_suspend = thread->is_external_suspend(); | |
2006 | |
2007 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
2008 | |
2009 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2010 // thread is not the current thread. In older versions of jdbx, jdbx | |
2011 // threads could call into the VM with another thread's JNIEnv so we | |
2012 // can be here operating on behalf of a suspended thread (4432884). | |
2013 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2014 JavaThreadState state = thread->thread_state(); | |
2015 | |
2016 // We mark this thread_blocked state as a suspend-equivalent so | |
2017 // that a caller to is_ext_suspend_completed() won't be confused. | |
2018 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2019 thread->set_suspend_equivalent(); | |
2020 | |
2021 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2022 // wait until the thread changes to other thread state. There is no | |
2023 // guarantee on how soon we can obtain the SR_lock and complete the | |
2024 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2025 // too long. Temporarily change the state to _thread_blocked to | |
2026 // let the VM thread know that this thread is ready for GC. The problem | |
2027 // of changing thread state is that safepoint could happen just after | |
2028 // java_suspend_self() returns after being resumed, and VM thread will | |
2029 // see the _thread_blocked state. We must check for safepoint | |
2030 // after restoring the state and make sure we won't leave while a safepoint | |
2031 // is in progress. | |
2032 thread->set_thread_state(_thread_blocked); | |
2033 thread->java_suspend_self(); | |
2034 thread->set_thread_state(state); | |
2035 // Make sure new state is seen by VM thread | |
2036 if (os::is_MP()) { | |
2037 if (UseMembar) { | |
2038 // Force a fence between the write above and read below | |
2039 OrderAccess::fence(); | |
2040 } else { | |
2041 // Must use this rather than serialization page in particular on Windows | |
2042 InterfaceSupport::serialize_memory(thread); | |
2043 } | |
2044 } | |
2045 } | |
2046 | |
2047 if (SafepointSynchronize::do_call_back()) { | |
2048 // If we are safepointing, then block the caller which may not be | |
2049 // the same as the target thread (see above). | |
2050 SafepointSynchronize::block(curJT); | |
2051 } | |
2052 | |
2053 if (thread->is_deopt_suspend()) { | |
2054 thread->clear_deopt_suspend(); | |
2055 RegisterMap map(thread, false); | |
2056 frame f = thread->last_frame(); | |
2057 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2058 f = f.sender(&map); | |
2059 } | |
2060 if (f.id() == thread->must_deopt_id()) { | |
2061 thread->clear_must_deopt_id(); | |
2062 // Since we know we're safe to deopt the current state is a safe state | |
2063 f.deoptimize(thread, true); | |
2064 } else { | |
2065 fatal("missed deoptimization!"); | |
2066 } | |
2067 } | |
2068 } | |
2069 | |
2070 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2071 // progress or when _suspend_flags is non-zero. | |
2072 // Current thread needs to self-suspend if there is a suspend request and/or | |
2073 // block if a safepoint is in progress. | |
2074 // Also check for pending async exception (not including unsafe access error). | |
2075 // Note only the native==>VM/Java barriers can call this function and when | |
2076 // thread state is _thread_in_native_trans. | |
2077 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2078 check_safepoint_and_suspend_for_native_trans(thread); | |
2079 | |
2080 if (thread->has_async_exception()) { | |
2081 // We are in _thread_in_native_trans state, don't handle unsafe | |
2082 // access error since that may block. | |
2083 thread->check_and_handle_async_exceptions(false); | |
2084 } | |
2085 } | |
2086 | |
2087 // We need to guarantee the Threads_lock here, since resumes are not | |
2088 // allowed during safepoint synchronization | |
2089 // Can only resume from an external suspension | |
2090 void JavaThread::java_resume() { | |
2091 assert_locked_or_safepoint(Threads_lock); | |
2092 | |
2093 // Sanity check: thread is gone, has started exiting or the thread | |
2094 // was not externally suspended. | |
2095 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2096 return; | |
2097 } | |
2098 | |
2099 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2100 | |
2101 clear_external_suspend(); | |
2102 | |
2103 if (is_ext_suspended()) { | |
2104 clear_ext_suspended(); | |
2105 SR_lock()->notify_all(); | |
2106 } | |
2107 } | |
2108 | |
2109 void JavaThread::create_stack_guard_pages() { | |
2110 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2111 address low_addr = stack_base() - stack_size(); | |
2112 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2113 | |
2114 int allocate = os::allocate_stack_guard_pages(); | |
2115 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2116 | |
2117 if (allocate && !os::commit_memory((char *) low_addr, len)) { | |
2118 warning("Attempt to allocate stack guard pages failed."); | |
2119 return; | |
2120 } | |
2121 | |
2122 if (os::guard_memory((char *) low_addr, len)) { | |
2123 _stack_guard_state = stack_guard_enabled; | |
2124 } else { | |
2125 warning("Attempt to protect stack guard pages failed."); | |
2126 if (os::uncommit_memory((char *) low_addr, len)) { | |
2127 warning("Attempt to deallocate stack guard pages failed."); | |
2128 } | |
2129 } | |
2130 } | |
2131 | |
2132 void JavaThread::remove_stack_guard_pages() { | |
2133 if (_stack_guard_state == stack_guard_unused) return; | |
2134 address low_addr = stack_base() - stack_size(); | |
2135 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2136 | |
2137 if (os::allocate_stack_guard_pages()) { | |
2138 if (os::uncommit_memory((char *) low_addr, len)) { | |
2139 _stack_guard_state = stack_guard_unused; | |
2140 } else { | |
2141 warning("Attempt to deallocate stack guard pages failed."); | |
2142 } | |
2143 } else { | |
2144 if (_stack_guard_state == stack_guard_unused) return; | |
2145 if (os::unguard_memory((char *) low_addr, len)) { | |
2146 _stack_guard_state = stack_guard_unused; | |
2147 } else { | |
2148 warning("Attempt to unprotect stack guard pages failed."); | |
2149 } | |
2150 } | |
2151 } | |
2152 | |
2153 void JavaThread::enable_stack_yellow_zone() { | |
2154 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2155 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2156 | |
2157 // The base notation is from the stacks point of view, growing downward. | |
2158 // We need to adjust it to work correctly with guard_memory() | |
2159 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2160 | |
2161 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2162 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2163 | |
2164 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2165 _stack_guard_state = stack_guard_enabled; | |
2166 } else { | |
2167 warning("Attempt to guard stack yellow zone failed."); | |
2168 } | |
2169 enable_register_stack_guard(); | |
2170 } | |
2171 | |
2172 void JavaThread::disable_stack_yellow_zone() { | |
2173 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2174 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2175 | |
2176 // Simply return if called for a thread that does not use guard pages. | |
2177 if (_stack_guard_state == stack_guard_unused) return; | |
2178 | |
2179 // The base notation is from the stacks point of view, growing downward. | |
2180 // We need to adjust it to work correctly with guard_memory() | |
2181 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2182 | |
2183 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2184 _stack_guard_state = stack_guard_yellow_disabled; | |
2185 } else { | |
2186 warning("Attempt to unguard stack yellow zone failed."); | |
2187 } | |
2188 disable_register_stack_guard(); | |
2189 } | |
2190 | |
2191 void JavaThread::enable_stack_red_zone() { | |
2192 // The base notation is from the stacks point of view, growing downward. | |
2193 // We need to adjust it to work correctly with guard_memory() | |
2194 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2195 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2196 | |
2197 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2198 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2199 | |
2200 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2201 warning("Attempt to guard stack red zone failed."); | |
2202 } | |
2203 } | |
2204 | |
2205 void JavaThread::disable_stack_red_zone() { | |
2206 // The base notation is from the stacks point of view, growing downward. | |
2207 // We need to adjust it to work correctly with guard_memory() | |
2208 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2209 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2210 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2211 warning("Attempt to unguard stack red zone failed."); | |
2212 } | |
2213 } | |
2214 | |
2215 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2216 // ignore is there is no stack | |
2217 if (!has_last_Java_frame()) return; | |
2218 // traverse the stack frames. Starts from top frame. | |
2219 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2220 frame* fr = fst.current(); | |
2221 f(fr, fst.register_map()); | |
2222 } | |
2223 } | |
2224 | |
2225 | |
2226 #ifndef PRODUCT | |
2227 // Deoptimization | |
2228 // Function for testing deoptimization | |
2229 void JavaThread::deoptimize() { | |
2230 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2231 StackFrameStream fst(this, UseBiasedLocking); | |
2232 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2233 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2234 // Iterate over all frames in the thread and deoptimize | |
2235 for(; !fst.is_done(); fst.next()) { | |
2236 if(fst.current()->can_be_deoptimized()) { | |
2237 | |
2238 if (only_at) { | |
2239 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2240 // consists of comma or carriage return separated numbers so | |
2241 // search for the current bci in that string. | |
2242 address pc = fst.current()->pc(); | |
2243 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2244 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2245 char buffer[8]; | |
2246 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2247 size_t len = strlen(buffer); | |
2248 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2249 while (found != NULL) { | |
2250 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2251 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2252 // Check that the bci found is bracketed by terminators. | |
2253 break; | |
2254 } | |
2255 found = strstr(found + 1, buffer); | |
2256 } | |
2257 if (!found) { | |
2258 continue; | |
2259 } | |
2260 } | |
2261 | |
2262 if (DebugDeoptimization && !deopt) { | |
2263 deopt = true; // One-time only print before deopt | |
2264 tty->print_cr("[BEFORE Deoptimization]"); | |
2265 trace_frames(); | |
2266 trace_stack(); | |
2267 } | |
2268 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2269 } | |
2270 } | |
2271 | |
2272 if (DebugDeoptimization && deopt) { | |
2273 tty->print_cr("[AFTER Deoptimization]"); | |
2274 trace_frames(); | |
2275 } | |
2276 } | |
2277 | |
2278 | |
2279 // Make zombies | |
2280 void JavaThread::make_zombies() { | |
2281 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2282 if (fst.current()->can_be_deoptimized()) { | |
2283 // it is a Java nmethod | |
2284 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2285 nm->make_not_entrant(); | |
2286 } | |
2287 } | |
2288 } | |
2289 #endif // PRODUCT | |
2290 | |
2291 | |
2292 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2293 if (!has_last_Java_frame()) return; | |
2294 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2295 StackFrameStream fst(this, UseBiasedLocking); | |
2296 for(; !fst.is_done(); fst.next()) { | |
2297 if (fst.current()->should_be_deoptimized()) { | |
2298 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2299 } | |
2300 } | |
2301 } | |
2302 | |
2303 | |
2304 // GC support | |
2305 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2306 | |
2307 void JavaThread::gc_epilogue() { | |
2308 frames_do(frame_gc_epilogue); | |
2309 } | |
2310 | |
2311 | |
2312 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2313 | |
2314 void JavaThread::gc_prologue() { | |
2315 frames_do(frame_gc_prologue); | |
2316 } | |
2317 | |
2318 | |
2319 void JavaThread::oops_do(OopClosure* f) { | |
2320 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do | |
2321 // since there may be more than one thread using each ThreadProfiler. | |
2322 | |
2323 // Traverse the GCHandles | |
2324 Thread::oops_do(f); | |
2325 | |
2326 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2327 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2328 | |
2329 if (has_last_Java_frame()) { | |
2330 | |
2331 // Traverse the privileged stack | |
2332 if (_privileged_stack_top != NULL) { | |
2333 _privileged_stack_top->oops_do(f); | |
2334 } | |
2335 | |
2336 // traverse the registered growable array | |
2337 if (_array_for_gc != NULL) { | |
2338 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2339 f->do_oop(_array_for_gc->adr_at(index)); | |
2340 } | |
2341 } | |
2342 | |
2343 // Traverse the monitor chunks | |
2344 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2345 chunk->oops_do(f); | |
2346 } | |
2347 | |
2348 // Traverse the execution stack | |
2349 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2350 fst.current()->oops_do(f, fst.register_map()); | |
2351 } | |
2352 } | |
2353 | |
2354 // callee_target is never live across a gc point so NULL it here should | |
2355 // it still contain a methdOop. | |
2356 | |
2357 set_callee_target(NULL); | |
2358 | |
2359 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2360 // If we have deferred set_locals there might be oops waiting to be | |
2361 // written | |
2362 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2363 if (list != NULL) { | |
2364 for (int i = 0; i < list->length(); i++) { | |
2365 list->at(i)->oops_do(f); | |
2366 } | |
2367 } | |
2368 | |
2369 // Traverse instance variables at the end since the GC may be moving things | |
2370 // around using this function | |
2371 f->do_oop((oop*) &_threadObj); | |
2372 f->do_oop((oop*) &_vm_result); | |
2373 f->do_oop((oop*) &_vm_result_2); | |
2374 f->do_oop((oop*) &_exception_oop); | |
2375 f->do_oop((oop*) &_pending_async_exception); | |
2376 | |
2377 if (jvmti_thread_state() != NULL) { | |
2378 jvmti_thread_state()->oops_do(f); | |
2379 } | |
2380 } | |
2381 | |
2382 void JavaThread::nmethods_do() { | |
2383 // Traverse the GCHandles | |
2384 Thread::nmethods_do(); | |
2385 | |
2386 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2387 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2388 | |
2389 if (has_last_Java_frame()) { | |
2390 // Traverse the execution stack | |
2391 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2392 fst.current()->nmethods_do(); | |
2393 } | |
2394 } | |
2395 } | |
2396 | |
2397 // Printing | |
2398 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2399 switch (_thread_state) { | |
2400 case _thread_uninitialized: return "_thread_uninitialized"; | |
2401 case _thread_new: return "_thread_new"; | |
2402 case _thread_new_trans: return "_thread_new_trans"; | |
2403 case _thread_in_native: return "_thread_in_native"; | |
2404 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2405 case _thread_in_vm: return "_thread_in_vm"; | |
2406 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2407 case _thread_in_Java: return "_thread_in_Java"; | |
2408 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2409 case _thread_blocked: return "_thread_blocked"; | |
2410 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2411 default: return "unknown thread state"; | |
2412 } | |
2413 } | |
2414 | |
2415 #ifndef PRODUCT | |
2416 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2417 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2418 }; | |
2419 void JavaThread::print_thread_state() const { | |
2420 print_thread_state_on(tty); | |
2421 }; | |
2422 #endif // PRODUCT | |
2423 | |
2424 // Called by Threads::print() for VM_PrintThreads operation | |
2425 void JavaThread::print_on(outputStream *st) const { | |
2426 st->print("\"%s\" ", get_thread_name()); | |
2427 oop thread_oop = threadObj(); | |
2428 if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2429 Thread::print_on(st); | |
2430 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
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|
2431 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
0 | 2432 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
2433 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2434 } | |
2435 #ifndef PRODUCT | |
2436 print_thread_state_on(st); | |
2437 _safepoint_state->print_on(st); | |
2438 #endif // PRODUCT | |
2439 } | |
2440 | |
2441 // Called by fatal error handler. The difference between this and | |
2442 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2443 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2444 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2445 oop thread_obj = threadObj(); | |
2446 if (thread_obj != NULL) { | |
2447 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2448 } | |
2449 st->print(" ["); | |
2450 st->print("%s", _get_thread_state_name(_thread_state)); | |
2451 if (osthread()) { | |
2452 st->print(", id=%d", osthread()->thread_id()); | |
2453 } | |
2454 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2455 _stack_base - _stack_size, _stack_base); | |
2456 st->print("]"); | |
2457 return; | |
2458 } | |
2459 | |
2460 // Verification | |
2461 | |
2462 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2463 | |
2464 void JavaThread::verify() { | |
2465 // Verify oops in the thread. | |
2466 oops_do(&VerifyOopClosure::verify_oop); | |
2467 | |
2468 // Verify the stack frames. | |
2469 frames_do(frame_verify); | |
2470 } | |
2471 | |
2472 // CR 6300358 (sub-CR 2137150) | |
2473 // Most callers of this method assume that it can't return NULL but a | |
2474 // thread may not have a name whilst it is in the process of attaching to | |
2475 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2476 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2477 // if vm exit occurs during initialization). These cases can all be accounted | |
2478 // for such that this method never returns NULL. | |
2479 const char* JavaThread::get_thread_name() const { | |
2480 #ifdef ASSERT | |
2481 // early safepoints can hit while current thread does not yet have TLS | |
2482 if (!SafepointSynchronize::is_at_safepoint()) { | |
2483 Thread *cur = Thread::current(); | |
2484 if (!(cur->is_Java_thread() && cur == this)) { | |
2485 // Current JavaThreads are allowed to get their own name without | |
2486 // the Threads_lock. | |
2487 assert_locked_or_safepoint(Threads_lock); | |
2488 } | |
2489 } | |
2490 #endif // ASSERT | |
2491 return get_thread_name_string(); | |
2492 } | |
2493 | |
2494 // Returns a non-NULL representation of this thread's name, or a suitable | |
2495 // descriptive string if there is no set name | |
2496 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2497 const char* name_str; | |
2498 oop thread_obj = threadObj(); | |
2499 if (thread_obj != NULL) { | |
2500 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2501 if (name != NULL) { | |
2502 if (buf == NULL) { | |
2503 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2504 } | |
2505 else { | |
2506 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2507 } | |
2508 } | |
2509 else if (is_attaching()) { // workaround for 6412693 - see 6404306 | |
2510 name_str = "<no-name - thread is attaching>"; | |
2511 } | |
2512 else { | |
2513 name_str = Thread::name(); | |
2514 } | |
2515 } | |
2516 else { | |
2517 name_str = Thread::name(); | |
2518 } | |
2519 assert(name_str != NULL, "unexpected NULL thread name"); | |
2520 return name_str; | |
2521 } | |
2522 | |
2523 | |
2524 const char* JavaThread::get_threadgroup_name() const { | |
2525 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2526 oop thread_obj = threadObj(); | |
2527 if (thread_obj != NULL) { | |
2528 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2529 if (thread_group != NULL) { | |
2530 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
2531 // ThreadGroup.name can be null | |
2532 if (name != NULL) { | |
2533 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2534 return str; | |
2535 } | |
2536 } | |
2537 } | |
2538 return NULL; | |
2539 } | |
2540 | |
2541 const char* JavaThread::get_parent_name() const { | |
2542 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2543 oop thread_obj = threadObj(); | |
2544 if (thread_obj != NULL) { | |
2545 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2546 if (thread_group != NULL) { | |
2547 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
2548 if (parent != NULL) { | |
2549 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
2550 // ThreadGroup.name can be null | |
2551 if (name != NULL) { | |
2552 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2553 return str; | |
2554 } | |
2555 } | |
2556 } | |
2557 } | |
2558 return NULL; | |
2559 } | |
2560 | |
2561 ThreadPriority JavaThread::java_priority() const { | |
2562 oop thr_oop = threadObj(); | |
2563 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
2564 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
2565 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
2566 return priority; | |
2567 } | |
2568 | |
2569 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
2570 | |
2571 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
2572 // Link Java Thread object <-> C++ Thread | |
2573 | |
2574 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
2575 // and put it into a new Handle. The Handle "thread_oop" can then | |
2576 // be used to pass the C++ thread object to other methods. | |
2577 | |
2578 // Set the Java level thread object (jthread) field of the | |
2579 // new thread (a JavaThread *) to C++ thread object using the | |
2580 // "thread_oop" handle. | |
2581 | |
2582 // Set the thread field (a JavaThread *) of the | |
2583 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
2584 | |
2585 Handle thread_oop(Thread::current(), | |
2586 JNIHandles::resolve_non_null(jni_thread)); | |
2587 assert(instanceKlass::cast(thread_oop->klass())->is_linked(), | |
2588 "must be initialized"); | |
2589 set_threadObj(thread_oop()); | |
2590 java_lang_Thread::set_thread(thread_oop(), this); | |
2591 | |
2592 if (prio == NoPriority) { | |
2593 prio = java_lang_Thread::priority(thread_oop()); | |
2594 assert(prio != NoPriority, "A valid priority should be present"); | |
2595 } | |
2596 | |
2597 // Push the Java priority down to the native thread; needs Threads_lock | |
2598 Thread::set_priority(this, prio); | |
2599 | |
2600 // Add the new thread to the Threads list and set it in motion. | |
2601 // We must have threads lock in order to call Threads::add. | |
2602 // It is crucial that we do not block before the thread is | |
2603 // added to the Threads list for if a GC happens, then the java_thread oop | |
2604 // will not be visited by GC. | |
2605 Threads::add(this); | |
2606 } | |
2607 | |
2608 oop JavaThread::current_park_blocker() { | |
2609 // Support for JSR-166 locks | |
2610 oop thread_oop = threadObj(); | |
242 | 2611 if (thread_oop != NULL && |
2612 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 2613 return java_lang_Thread::park_blocker(thread_oop); |
2614 } | |
2615 return NULL; | |
2616 } | |
2617 | |
2618 | |
2619 void JavaThread::print_stack_on(outputStream* st) { | |
2620 if (!has_last_Java_frame()) return; | |
2621 ResourceMark rm; | |
2622 HandleMark hm; | |
2623 | |
2624 RegisterMap reg_map(this); | |
2625 vframe* start_vf = last_java_vframe(®_map); | |
2626 int count = 0; | |
2627 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2628 if (f->is_java_frame()) { | |
2629 javaVFrame* jvf = javaVFrame::cast(f); | |
2630 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
2631 | |
2632 // Print out lock information | |
2633 if (JavaMonitorsInStackTrace) { | |
2634 jvf->print_lock_info_on(st, count); | |
2635 } | |
2636 } else { | |
2637 // Ignore non-Java frames | |
2638 } | |
2639 | |
2640 // Bail-out case for too deep stacks | |
2641 count++; | |
2642 if (MaxJavaStackTraceDepth == count) return; | |
2643 } | |
2644 } | |
2645 | |
2646 | |
2647 // JVMTI PopFrame support | |
2648 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
2649 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
2650 if (in_bytes(size_in_bytes) != 0) { | |
2651 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes)); | |
2652 _popframe_preserved_args_size = in_bytes(size_in_bytes); | |
2653 Copy::conjoint_bytes(start, _popframe_preserved_args, _popframe_preserved_args_size); | |
2654 } | |
2655 } | |
2656 | |
2657 void* JavaThread::popframe_preserved_args() { | |
2658 return _popframe_preserved_args; | |
2659 } | |
2660 | |
2661 ByteSize JavaThread::popframe_preserved_args_size() { | |
2662 return in_ByteSize(_popframe_preserved_args_size); | |
2663 } | |
2664 | |
2665 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
2666 int sz = in_bytes(popframe_preserved_args_size()); | |
2667 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
2668 return in_WordSize(sz / wordSize); | |
2669 } | |
2670 | |
2671 void JavaThread::popframe_free_preserved_args() { | |
2672 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
2673 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args); | |
2674 _popframe_preserved_args = NULL; | |
2675 _popframe_preserved_args_size = 0; | |
2676 } | |
2677 | |
2678 #ifndef PRODUCT | |
2679 | |
2680 void JavaThread::trace_frames() { | |
2681 tty->print_cr("[Describe stack]"); | |
2682 int frame_no = 1; | |
2683 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2684 tty->print(" %d. ", frame_no++); | |
2685 fst.current()->print_value_on(tty,this); | |
2686 tty->cr(); | |
2687 } | |
2688 } | |
2689 | |
2690 | |
2691 void JavaThread::trace_stack_from(vframe* start_vf) { | |
2692 ResourceMark rm; | |
2693 int vframe_no = 1; | |
2694 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2695 if (f->is_java_frame()) { | |
2696 javaVFrame::cast(f)->print_activation(vframe_no++); | |
2697 } else { | |
2698 f->print(); | |
2699 } | |
2700 if (vframe_no > StackPrintLimit) { | |
2701 tty->print_cr("...<more frames>..."); | |
2702 return; | |
2703 } | |
2704 } | |
2705 } | |
2706 | |
2707 | |
2708 void JavaThread::trace_stack() { | |
2709 if (!has_last_Java_frame()) return; | |
2710 ResourceMark rm; | |
2711 HandleMark hm; | |
2712 RegisterMap reg_map(this); | |
2713 trace_stack_from(last_java_vframe(®_map)); | |
2714 } | |
2715 | |
2716 | |
2717 #endif // PRODUCT | |
2718 | |
2719 | |
2720 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
2721 assert(reg_map != NULL, "a map must be given"); | |
2722 frame f = last_frame(); | |
2723 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
2724 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
2725 } | |
2726 return NULL; | |
2727 } | |
2728 | |
2729 | |
2730 klassOop JavaThread::security_get_caller_class(int depth) { | |
2731 vframeStream vfst(this); | |
2732 vfst.security_get_caller_frame(depth); | |
2733 if (!vfst.at_end()) { | |
2734 return vfst.method()->method_holder(); | |
2735 } | |
2736 return NULL; | |
2737 } | |
2738 | |
2739 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
2740 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
2741 CompileBroker::compiler_thread_loop(); | |
2742 } | |
2743 | |
2744 // Create a CompilerThread | |
2745 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
2746 : JavaThread(&compiler_thread_entry) { | |
2747 _env = NULL; | |
2748 _log = NULL; | |
2749 _task = NULL; | |
2750 _queue = queue; | |
2751 _counters = counters; | |
2752 | |
2753 #ifndef PRODUCT | |
2754 _ideal_graph_printer = NULL; | |
2755 #endif | |
2756 } | |
2757 | |
2758 | |
2759 // ======= Threads ======== | |
2760 | |
2761 // The Threads class links together all active threads, and provides | |
2762 // operations over all threads. It is protected by its own Mutex | |
2763 // lock, which is also used in other contexts to protect thread | |
2764 // operations from having the thread being operated on from exiting | |
2765 // and going away unexpectedly (e.g., safepoint synchronization) | |
2766 | |
2767 JavaThread* Threads::_thread_list = NULL; | |
2768 int Threads::_number_of_threads = 0; | |
2769 int Threads::_number_of_non_daemon_threads = 0; | |
2770 int Threads::_return_code = 0; | |
2771 size_t JavaThread::_stack_size_at_create = 0; | |
2772 | |
2773 // All JavaThreads | |
2774 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
2775 | |
2776 void os_stream(); | |
2777 | |
2778 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
2779 void Threads::threads_do(ThreadClosure* tc) { | |
2780 assert_locked_or_safepoint(Threads_lock); | |
2781 // ALL_JAVA_THREADS iterates through all JavaThreads | |
2782 ALL_JAVA_THREADS(p) { | |
2783 tc->do_thread(p); | |
2784 } | |
2785 // Someday we could have a table or list of all non-JavaThreads. | |
2786 // For now, just manually iterate through them. | |
2787 tc->do_thread(VMThread::vm_thread()); | |
2788 Universe::heap()->gc_threads_do(tc); | |
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2789 WatcherThread *wt = WatcherThread::watcher_thread(); |
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2790 // Strictly speaking, the following NULL check isn't sufficient to make sure |
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2791 // the data for WatcherThread is still valid upon being examined. However, |
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2792 // considering that WatchThread terminates when the VM is on the way to |
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2793 // exit at safepoint, the chance of the above is extremely small. The right |
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2794 // way to prevent termination of WatcherThread would be to acquire |
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2795 // Terminator_lock, but we can't do that without violating the lock rank |
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2796 // checking in some cases. |
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2797 if (wt != NULL) |
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2798 tc->do_thread(wt); |
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2799 |
0 | 2800 // If CompilerThreads ever become non-JavaThreads, add them here |
2801 } | |
2802 | |
2803 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
2804 | |
242 | 2805 extern void JDK_Version_init(); |
2806 | |
0 | 2807 // Check version |
2808 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
2809 | |
2810 // Initialize the output stream module | |
2811 ostream_init(); | |
2812 | |
2813 // Process java launcher properties. | |
2814 Arguments::process_sun_java_launcher_properties(args); | |
2815 | |
2816 // Initialize the os module before using TLS | |
2817 os::init(); | |
2818 | |
2819 // Initialize system properties. | |
2820 Arguments::init_system_properties(); | |
2821 | |
242 | 2822 // So that JDK version can be used as a discrimintor when parsing arguments |
2823 JDK_Version_init(); | |
2824 | |
0 | 2825 // Parse arguments |
2826 jint parse_result = Arguments::parse(args); | |
2827 if (parse_result != JNI_OK) return parse_result; | |
2828 | |
2829 if (PauseAtStartup) { | |
2830 os::pause(); | |
2831 } | |
2832 | |
2833 HS_DTRACE_PROBE(hotspot, vm__init__begin); | |
2834 | |
2835 // Record VM creation timing statistics | |
2836 TraceVmCreationTime create_vm_timer; | |
2837 create_vm_timer.start(); | |
2838 | |
2839 // Timing (must come after argument parsing) | |
2840 TraceTime timer("Create VM", TraceStartupTime); | |
2841 | |
2842 // Initialize the os module after parsing the args | |
2843 jint os_init_2_result = os::init_2(); | |
2844 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
2845 | |
2846 // Initialize output stream logging | |
2847 ostream_init_log(); | |
2848 | |
2849 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
2850 // Must be before create_vm_init_agents() | |
2851 if (Arguments::init_libraries_at_startup()) { | |
2852 convert_vm_init_libraries_to_agents(); | |
2853 } | |
2854 | |
2855 // Launch -agentlib/-agentpath and converted -Xrun agents | |
2856 if (Arguments::init_agents_at_startup()) { | |
2857 create_vm_init_agents(); | |
2858 } | |
2859 | |
2860 // Initialize Threads state | |
2861 _thread_list = NULL; | |
2862 _number_of_threads = 0; | |
2863 _number_of_non_daemon_threads = 0; | |
2864 | |
2865 // Initialize TLS | |
2866 ThreadLocalStorage::init(); | |
2867 | |
2868 // Initialize global data structures and create system classes in heap | |
2869 vm_init_globals(); | |
2870 | |
2871 // Attach the main thread to this os thread | |
2872 JavaThread* main_thread = new JavaThread(); | |
2873 main_thread->set_thread_state(_thread_in_vm); | |
2874 // must do this before set_active_handles and initialize_thread_local_storage | |
2875 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
2876 // change the stack size recorded here to one based on the java thread | |
2877 // stacksize. This adjusted size is what is used to figure the placement | |
2878 // of the guard pages. | |
2879 main_thread->record_stack_base_and_size(); | |
2880 main_thread->initialize_thread_local_storage(); | |
2881 | |
2882 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
2883 | |
2884 if (!main_thread->set_as_starting_thread()) { | |
2885 vm_shutdown_during_initialization( | |
2886 "Failed necessary internal allocation. Out of swap space"); | |
2887 delete main_thread; | |
2888 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
2889 return JNI_ENOMEM; | |
2890 } | |
2891 | |
2892 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
2893 // crash Linux VM, see notes in os_linux.cpp. | |
2894 main_thread->create_stack_guard_pages(); | |
2895 | |
2896 // Initialize Java-Leve synchronization subsystem | |
2897 ObjectSynchronizer::Initialize() ; | |
2898 | |
2899 // Initialize global modules | |
2900 jint status = init_globals(); | |
2901 if (status != JNI_OK) { | |
2902 delete main_thread; | |
2903 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
2904 return status; | |
2905 } | |
2906 | |
2907 HandleMark hm; | |
2908 | |
2909 { MutexLocker mu(Threads_lock); | |
2910 Threads::add(main_thread); | |
2911 } | |
2912 | |
2913 // Any JVMTI raw monitors entered in onload will transition into | |
2914 // real raw monitor. VM is setup enough here for raw monitor enter. | |
2915 JvmtiExport::transition_pending_onload_raw_monitors(); | |
2916 | |
2917 if (VerifyBeforeGC && | |
2918 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
2919 Universe::heap()->prepare_for_verify(); | |
2920 Universe::verify(); // make sure we're starting with a clean slate | |
2921 } | |
2922 | |
2923 // Create the VMThread | |
2924 { TraceTime timer("Start VMThread", TraceStartupTime); | |
2925 VMThread::create(); | |
2926 Thread* vmthread = VMThread::vm_thread(); | |
2927 | |
2928 if (!os::create_thread(vmthread, os::vm_thread)) | |
2929 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
2930 | |
2931 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
2932 // Monitors can have spurious returns, must always check another state flag | |
2933 { | |
2934 MutexLocker ml(Notify_lock); | |
2935 os::start_thread(vmthread); | |
2936 while (vmthread->active_handles() == NULL) { | |
2937 Notify_lock->wait(); | |
2938 } | |
2939 } | |
2940 } | |
2941 | |
2942 assert (Universe::is_fully_initialized(), "not initialized"); | |
2943 EXCEPTION_MARK; | |
2944 | |
2945 // At this point, the Universe is initialized, but we have not executed | |
2946 // any byte code. Now is a good time (the only time) to dump out the | |
2947 // internal state of the JVM for sharing. | |
2948 | |
2949 if (DumpSharedSpaces) { | |
2950 Universe::heap()->preload_and_dump(CHECK_0); | |
2951 ShouldNotReachHere(); | |
2952 } | |
2953 | |
2954 // Always call even when there are not JVMTI environments yet, since environments | |
2955 // may be attached late and JVMTI must track phases of VM execution | |
2956 JvmtiExport::enter_start_phase(); | |
2957 | |
2958 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
2959 JvmtiExport::post_vm_start(); | |
2960 | |
2961 { | |
2962 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
2963 | |
2964 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
2965 create_vm_init_libraries(); | |
2966 } | |
2967 | |
2968 if (InitializeJavaLangString) { | |
2969 initialize_class(vmSymbolHandles::java_lang_String(), CHECK_0); | |
2970 } else { | |
2971 warning("java.lang.String not initialized"); | |
2972 } | |
2973 | |
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2974 if (AggressiveOpts) { |
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2975 { |
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2976 // Forcibly initialize java/util/HashMap and mutate the private |
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2977 // static final "frontCacheEnabled" field before we start creating instances |
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2978 #ifdef ASSERT |
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2979 klassOop tmp_k = SystemDictionary::find(vmSymbolHandles::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
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2980 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
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2981 #endif |
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2982 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbolHandles::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
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2983 KlassHandle k = KlassHandle(THREAD, k_o); |
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2984 guarantee(k.not_null(), "Must find java/util/HashMap"); |
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2985 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
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2986 ik->initialize(CHECK_0); |
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2987 fieldDescriptor fd; |
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2988 // Possible we might not find this field; if so, don't break |
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2989 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
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2990 k()->bool_field_put(fd.offset(), true); |
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2991 } |
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2992 } |
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2993 |
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2994 if (UseStringCache) { |
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2995 // Forcibly initialize java/lang/StringValue and mutate the private |
192
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2996 // static final "stringCacheEnabled" field before we start creating instances |
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2997 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbolHandles::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
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2998 // Possible that StringValue isn't present: if so, silently don't break |
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2999 if (k_o != NULL) { |
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3000 KlassHandle k = KlassHandle(THREAD, k_o); |
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3001 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
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3002 ik->initialize(CHECK_0); |
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3003 fieldDescriptor fd; |
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3004 // Possible we might not find this field: if so, silently don't break |
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3005 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
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3006 k()->bool_field_put(fd.offset(), true); |
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3007 } |
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3008 } |
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3009 } |
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3010 } |
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3011 |
0 | 3012 // Initialize java_lang.System (needed before creating the thread) |
3013 if (InitializeJavaLangSystem) { | |
3014 initialize_class(vmSymbolHandles::java_lang_System(), CHECK_0); | |
3015 initialize_class(vmSymbolHandles::java_lang_ThreadGroup(), CHECK_0); | |
3016 Handle thread_group = create_initial_thread_group(CHECK_0); | |
3017 Universe::set_main_thread_group(thread_group()); | |
3018 initialize_class(vmSymbolHandles::java_lang_Thread(), CHECK_0); | |
3019 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); | |
3020 main_thread->set_threadObj(thread_object); | |
3021 // Set thread status to running since main thread has | |
3022 // been started and running. | |
3023 java_lang_Thread::set_thread_status(thread_object, | |
3024 java_lang_Thread::RUNNABLE); | |
3025 | |
3026 // The VM preresolve methods to these classes. Make sure that get initialized | |
3027 initialize_class(vmSymbolHandles::java_lang_reflect_Method(), CHECK_0); | |
3028 initialize_class(vmSymbolHandles::java_lang_ref_Finalizer(), CHECK_0); | |
3029 // The VM creates & returns objects of this class. Make sure it's initialized. | |
3030 initialize_class(vmSymbolHandles::java_lang_Class(), CHECK_0); | |
3031 call_initializeSystemClass(CHECK_0); | |
3032 } else { | |
3033 warning("java.lang.System not initialized"); | |
3034 } | |
3035 | |
3036 // an instance of OutOfMemory exception has been allocated earlier | |
3037 if (InitializeJavaLangExceptionsErrors) { | |
3038 initialize_class(vmSymbolHandles::java_lang_OutOfMemoryError(), CHECK_0); | |
3039 initialize_class(vmSymbolHandles::java_lang_NullPointerException(), CHECK_0); | |
3040 initialize_class(vmSymbolHandles::java_lang_ClassCastException(), CHECK_0); | |
3041 initialize_class(vmSymbolHandles::java_lang_ArrayStoreException(), CHECK_0); | |
3042 initialize_class(vmSymbolHandles::java_lang_ArithmeticException(), CHECK_0); | |
3043 initialize_class(vmSymbolHandles::java_lang_StackOverflowError(), CHECK_0); | |
3044 initialize_class(vmSymbolHandles::java_lang_IllegalMonitorStateException(), CHECK_0); | |
3045 } else { | |
3046 warning("java.lang.OutOfMemoryError has not been initialized"); | |
3047 warning("java.lang.NullPointerException has not been initialized"); | |
3048 warning("java.lang.ClassCastException has not been initialized"); | |
3049 warning("java.lang.ArrayStoreException has not been initialized"); | |
3050 warning("java.lang.ArithmeticException has not been initialized"); | |
3051 warning("java.lang.StackOverflowError has not been initialized"); | |
3052 } | |
3053 } | |
3054 | |
3055 // See : bugid 4211085. | |
3056 // Background : the static initializer of java.lang.Compiler tries to read | |
3057 // property"java.compiler" and read & write property "java.vm.info". | |
3058 // When a security manager is installed through the command line | |
3059 // option "-Djava.security.manager", the above properties are not | |
3060 // readable and the static initializer for java.lang.Compiler fails | |
3061 // resulting in a NoClassDefFoundError. This can happen in any | |
3062 // user code which calls methods in java.lang.Compiler. | |
3063 // Hack : the hack is to pre-load and initialize this class, so that only | |
3064 // system domains are on the stack when the properties are read. | |
3065 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
3066 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
3067 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
3068 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
3069 // Once that is done, we should remove this hack. | |
3070 initialize_class(vmSymbolHandles::java_lang_Compiler(), CHECK_0); | |
3071 | |
3072 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
3073 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
3074 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
3075 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
3076 // This should also be taken out as soon as 4211383 gets fixed. | |
3077 reset_vm_info_property(CHECK_0); | |
3078 | |
3079 quicken_jni_functions(); | |
3080 | |
3081 // Set flag that basic initialization has completed. Used by exceptions and various | |
3082 // debug stuff, that does not work until all basic classes have been initialized. | |
3083 set_init_completed(); | |
3084 | |
3085 HS_DTRACE_PROBE(hotspot, vm__init__end); | |
3086 | |
3087 // record VM initialization completion time | |
3088 Management::record_vm_init_completed(); | |
3089 | |
3090 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3091 // valid exceptions may be thrown in the process. | |
3092 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3093 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3094 // anymore. We call vm_exit_during_initialization directly instead. | |
3095 SystemDictionary::compute_java_system_loader(THREAD); | |
3096 if (HAS_PENDING_EXCEPTION) { | |
3097 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3098 } | |
3099 | |
3100 #ifndef SERIALGC | |
3101 // Support for ConcurrentMarkSweep. This should be cleaned up | |
342
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3102 // and better encapsulated. The ugly nested if test would go away |
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3103 // once things are properly refactored. XXX YSR |
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3104 if (UseConcMarkSweepGC || UseG1GC) { |
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3105 if (UseConcMarkSweepGC) { |
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3106 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
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3107 } else { |
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3108 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
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3109 } |
0 | 3110 if (HAS_PENDING_EXCEPTION) { |
3111 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3112 } | |
3113 } | |
3114 #endif // SERIALGC | |
3115 | |
3116 // Always call even when there are not JVMTI environments yet, since environments | |
3117 // may be attached late and JVMTI must track phases of VM execution | |
3118 JvmtiExport::enter_live_phase(); | |
3119 | |
3120 // Signal Dispatcher needs to be started before VMInit event is posted | |
3121 os::signal_init(); | |
3122 | |
3123 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3124 if (!DisableAttachMechanism) { | |
3125 if (StartAttachListener || AttachListener::init_at_startup()) { | |
3126 AttachListener::init(); | |
3127 } | |
3128 } | |
3129 | |
3130 // Launch -Xrun agents | |
3131 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3132 // back-end can launch with -Xdebug -Xrunjdwp. | |
3133 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3134 create_vm_init_libraries(); | |
3135 } | |
3136 | |
3137 // Notify JVMTI agents that VM initialization is complete - nop if no agents. | |
3138 JvmtiExport::post_vm_initialized(); | |
3139 | |
3140 Chunk::start_chunk_pool_cleaner_task(); | |
3141 | |
3142 // initialize compiler(s) | |
3143 CompileBroker::compilation_init(); | |
3144 | |
3145 Management::initialize(THREAD); | |
3146 if (HAS_PENDING_EXCEPTION) { | |
3147 // management agent fails to start possibly due to | |
3148 // configuration problem and is responsible for printing | |
3149 // stack trace if appropriate. Simply exit VM. | |
3150 vm_exit(1); | |
3151 } | |
3152 | |
3153 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3154 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
3155 if (MemProfiling) MemProfiler::engage(); | |
3156 StatSampler::engage(); | |
3157 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3158 | |
3159 BiasedLocking::init(); | |
3160 | |
3161 | |
3162 // Start up the WatcherThread if there are any periodic tasks | |
3163 // NOTE: All PeriodicTasks should be registered by now. If they | |
3164 // aren't, late joiners might appear to start slowly (we might | |
3165 // take a while to process their first tick). | |
3166 if (PeriodicTask::num_tasks() > 0) { | |
3167 WatcherThread::start(); | |
3168 } | |
3169 | |
3170 create_vm_timer.end(); | |
3171 return JNI_OK; | |
3172 } | |
3173 | |
3174 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3175 extern "C" { | |
3176 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3177 } | |
3178 // Find a command line agent library and return its entry point for | |
3179 // -agentlib: -agentpath: -Xrun | |
3180 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3181 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3182 OnLoadEntry_t on_load_entry = NULL; | |
3183 void *library = agent->os_lib(); // check if we have looked it up before | |
3184 | |
3185 if (library == NULL) { | |
3186 char buffer[JVM_MAXPATHLEN]; | |
3187 char ebuf[1024]; | |
3188 const char *name = agent->name(); | |
3189 | |
3190 if (agent->is_absolute_path()) { | |
3191 library = hpi::dll_load(name, ebuf, sizeof ebuf); | |
3192 if (library == NULL) { | |
3193 // If we can't find the agent, exit. | |
3194 vm_exit_during_initialization("Could not find agent library in absolute path", name); | |
3195 } | |
3196 } else { | |
3197 // Try to load the agent from the standard dll directory | |
3198 hpi::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); | |
3199 library = hpi::dll_load(buffer, ebuf, sizeof ebuf); | |
3200 #ifdef KERNEL | |
3201 // Download instrument dll | |
3202 if (library == NULL && strcmp(name, "instrument") == 0) { | |
3203 char *props = Arguments::get_kernel_properties(); | |
3204 char *home = Arguments::get_java_home(); | |
3205 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
3206 " sun.jkernel.DownloadManager -download client_jvm"; | |
3207 int length = strlen(props) + strlen(home) + strlen(fmt) + 1; | |
3208 char *cmd = AllocateHeap(length); | |
3209 jio_snprintf(cmd, length, fmt, home, props); | |
3210 int status = os::fork_and_exec(cmd); | |
3211 FreeHeap(props); | |
3212 FreeHeap(cmd); | |
3213 if (status == -1) { | |
3214 warning(cmd); | |
3215 vm_exit_during_initialization("fork_and_exec failed: %s", | |
3216 strerror(errno)); | |
3217 } | |
3218 // when this comes back the instrument.dll should be where it belongs. | |
3219 library = hpi::dll_load(buffer, ebuf, sizeof ebuf); | |
3220 } | |
3221 #endif // KERNEL | |
3222 if (library == NULL) { // Try the local directory | |
3223 char ns[1] = {0}; | |
3224 hpi::dll_build_name(buffer, sizeof(buffer), ns, name); | |
3225 library = hpi::dll_load(buffer, ebuf, sizeof ebuf); | |
3226 if (library == NULL) { | |
3227 // If we can't find the agent, exit. | |
3228 vm_exit_during_initialization("Could not find agent library on the library path or in the local directory", name); | |
3229 } | |
3230 } | |
3231 } | |
3232 agent->set_os_lib(library); | |
3233 } | |
3234 | |
3235 // Find the OnLoad function. | |
3236 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
3237 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, hpi::dll_lookup(library, on_load_symbols[symbol_index])); | |
3238 if (on_load_entry != NULL) break; | |
3239 } | |
3240 return on_load_entry; | |
3241 } | |
3242 | |
3243 // Find the JVM_OnLoad entry point | |
3244 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3245 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3246 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3247 } | |
3248 | |
3249 // Find the Agent_OnLoad entry point | |
3250 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3251 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3252 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3253 } | |
3254 | |
3255 // For backwards compatibility with -Xrun | |
3256 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3257 // treated like -agentpath: | |
3258 // Must be called before agent libraries are created | |
3259 void Threads::convert_vm_init_libraries_to_agents() { | |
3260 AgentLibrary* agent; | |
3261 AgentLibrary* next; | |
3262 | |
3263 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3264 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3265 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3266 | |
3267 // If there is an JVM_OnLoad function it will get called later, | |
3268 // otherwise see if there is an Agent_OnLoad | |
3269 if (on_load_entry == NULL) { | |
3270 on_load_entry = lookup_agent_on_load(agent); | |
3271 if (on_load_entry != NULL) { | |
3272 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3273 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3274 Arguments::convert_library_to_agent(agent); | |
3275 } else { | |
3276 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3277 } | |
3278 } | |
3279 } | |
3280 } | |
3281 | |
3282 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3283 // Invokes Agent_OnLoad | |
3284 // Called very early -- before JavaThreads exist | |
3285 void Threads::create_vm_init_agents() { | |
3286 extern struct JavaVM_ main_vm; | |
3287 AgentLibrary* agent; | |
3288 | |
3289 JvmtiExport::enter_onload_phase(); | |
3290 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3291 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3292 | |
3293 if (on_load_entry != NULL) { | |
3294 // Invoke the Agent_OnLoad function | |
3295 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3296 if (err != JNI_OK) { | |
3297 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3298 } | |
3299 } else { | |
3300 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3301 } | |
3302 } | |
3303 JvmtiExport::enter_primordial_phase(); | |
3304 } | |
3305 | |
3306 extern "C" { | |
3307 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3308 } | |
3309 | |
3310 void Threads::shutdown_vm_agents() { | |
3311 // Send any Agent_OnUnload notifications | |
3312 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
3313 extern struct JavaVM_ main_vm; | |
3314 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3315 | |
3316 // Find the Agent_OnUnload function. | |
3317 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
3318 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
3319 hpi::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); | |
3320 | |
3321 // Invoke the Agent_OnUnload function | |
3322 if (unload_entry != NULL) { | |
3323 JavaThread* thread = JavaThread::current(); | |
3324 ThreadToNativeFromVM ttn(thread); | |
3325 HandleMark hm(thread); | |
3326 (*unload_entry)(&main_vm); | |
3327 break; | |
3328 } | |
3329 } | |
3330 } | |
3331 } | |
3332 | |
3333 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3334 // Invokes JVM_OnLoad | |
3335 void Threads::create_vm_init_libraries() { | |
3336 extern struct JavaVM_ main_vm; | |
3337 AgentLibrary* agent; | |
3338 | |
3339 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3340 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3341 | |
3342 if (on_load_entry != NULL) { | |
3343 // Invoke the JVM_OnLoad function | |
3344 JavaThread* thread = JavaThread::current(); | |
3345 ThreadToNativeFromVM ttn(thread); | |
3346 HandleMark hm(thread); | |
3347 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3348 if (err != JNI_OK) { | |
3349 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3350 } | |
3351 } else { | |
3352 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3353 } | |
3354 } | |
3355 } | |
3356 | |
3357 // Last thread running calls java.lang.Shutdown.shutdown() | |
3358 void JavaThread::invoke_shutdown_hooks() { | |
3359 HandleMark hm(this); | |
3360 | |
3361 // We could get here with a pending exception, if so clear it now. | |
3362 if (this->has_pending_exception()) { | |
3363 this->clear_pending_exception(); | |
3364 } | |
3365 | |
3366 EXCEPTION_MARK; | |
3367 klassOop k = | |
3368 SystemDictionary::resolve_or_null(vmSymbolHandles::java_lang_Shutdown(), | |
3369 THREAD); | |
3370 if (k != NULL) { | |
3371 // SystemDictionary::resolve_or_null will return null if there was | |
3372 // an exception. If we cannot load the Shutdown class, just don't | |
3373 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3374 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3375 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3376 // was called, the Shutdown class would have already been loaded | |
3377 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3378 instanceKlassHandle shutdown_klass (THREAD, k); | |
3379 JavaValue result(T_VOID); | |
3380 JavaCalls::call_static(&result, | |
3381 shutdown_klass, | |
3382 vmSymbolHandles::shutdown_method_name(), | |
3383 vmSymbolHandles::void_method_signature(), | |
3384 THREAD); | |
3385 } | |
3386 CLEAR_PENDING_EXCEPTION; | |
3387 } | |
3388 | |
3389 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3390 // the program falls off the end of main(). Another VM exit path is through | |
3391 // vm_exit() when the program calls System.exit() to return a value or when | |
3392 // there is a serious error in VM. The two shutdown paths are not exactly | |
3393 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3394 // and VM_Exit op at VM level. | |
3395 // | |
3396 // Shutdown sequence: | |
3397 // + Wait until we are the last non-daemon thread to execute | |
3398 // <-- every thing is still working at this moment --> | |
3399 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3400 // shutdown hooks, run finalizers if finalization-on-exit | |
3401 // + Call before_exit(), prepare for VM exit | |
3402 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3403 // currently the only user of this mechanism is File.deleteOnExit()) | |
3404 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3405 // post thread end and vm death events to JVMTI, | |
3406 // stop signal thread | |
3407 // + Call JavaThread::exit(), it will: | |
3408 // > release JNI handle blocks, remove stack guard pages | |
3409 // > remove this thread from Threads list | |
3410 // <-- no more Java code from this thread after this point --> | |
3411 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3412 // the compiler threads at safepoint | |
3413 // <-- do not use anything that could get blocked by Safepoint --> | |
3414 // + Disable tracing at JNI/JVM barriers | |
3415 // + Set _vm_exited flag for threads that are still running native code | |
3416 // + Delete this thread | |
3417 // + Call exit_globals() | |
3418 // > deletes tty | |
3419 // > deletes PerfMemory resources | |
3420 // + Return to caller | |
3421 | |
3422 bool Threads::destroy_vm() { | |
3423 JavaThread* thread = JavaThread::current(); | |
3424 | |
3425 // Wait until we are the last non-daemon thread to execute | |
3426 { MutexLocker nu(Threads_lock); | |
3427 while (Threads::number_of_non_daemon_threads() > 1 ) | |
3428 // This wait should make safepoint checks, wait without a timeout, | |
3429 // and wait as a suspend-equivalent condition. | |
3430 // | |
3431 // Note: If the FlatProfiler is running and this thread is waiting | |
3432 // for another non-daemon thread to finish, then the FlatProfiler | |
3433 // is waiting for the external suspend request on this thread to | |
3434 // complete. wait_for_ext_suspend_completion() will eventually | |
3435 // timeout, but that takes time. Making this wait a suspend- | |
3436 // equivalent condition solves that timeout problem. | |
3437 // | |
3438 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
3439 Mutex::_as_suspend_equivalent_flag); | |
3440 } | |
3441 | |
3442 // Hang forever on exit if we are reporting an error. | |
3443 if (ShowMessageBoxOnError && is_error_reported()) { | |
3444 os::infinite_sleep(); | |
3445 } | |
3446 | |
3447 if (JDK_Version::is_jdk12x_version()) { | |
3448 // We are the last thread running, so check if finalizers should be run. | |
3449 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
3450 HandleMark rm(thread); | |
3451 Universe::run_finalizers_on_exit(); | |
3452 } else { | |
3453 // run Java level shutdown hooks | |
3454 thread->invoke_shutdown_hooks(); | |
3455 } | |
3456 | |
3457 before_exit(thread); | |
3458 | |
3459 thread->exit(true); | |
3460 | |
3461 // Stop VM thread. | |
3462 { | |
3463 // 4945125 The vm thread comes to a safepoint during exit. | |
3464 // GC vm_operations can get caught at the safepoint, and the | |
3465 // heap is unparseable if they are caught. Grab the Heap_lock | |
3466 // to prevent this. The GC vm_operations will not be able to | |
3467 // queue until after the vm thread is dead. | |
3468 MutexLocker ml(Heap_lock); | |
3469 | |
3470 VMThread::wait_for_vm_thread_exit(); | |
3471 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
3472 VMThread::destroy(); | |
3473 } | |
3474 | |
3475 // clean up ideal graph printers | |
3476 #if defined(COMPILER2) && !defined(PRODUCT) | |
3477 IdealGraphPrinter::clean_up(); | |
3478 #endif | |
3479 | |
3480 // Now, all Java threads are gone except daemon threads. Daemon threads | |
3481 // running Java code or in VM are stopped by the Safepoint. However, | |
3482 // daemon threads executing native code are still running. But they | |
3483 // will be stopped at native=>Java/VM barriers. Note that we can't | |
3484 // simply kill or suspend them, as it is inherently deadlock-prone. | |
3485 | |
3486 #ifndef PRODUCT | |
3487 // disable function tracing at JNI/JVM barriers | |
3488 TraceHPI = false; | |
3489 TraceJNICalls = false; | |
3490 TraceJVMCalls = false; | |
3491 TraceRuntimeCalls = false; | |
3492 #endif | |
3493 | |
3494 VM_Exit::set_vm_exited(); | |
3495 | |
3496 notify_vm_shutdown(); | |
3497 | |
3498 delete thread; | |
3499 | |
3500 // exit_globals() will delete tty | |
3501 exit_globals(); | |
3502 | |
3503 return true; | |
3504 } | |
3505 | |
3506 | |
3507 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
3508 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
3509 return is_supported_jni_version(version); | |
3510 } | |
3511 | |
3512 | |
3513 jboolean Threads::is_supported_jni_version(jint version) { | |
3514 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
3515 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
3516 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
3517 return JNI_FALSE; | |
3518 } | |
3519 | |
3520 | |
3521 void Threads::add(JavaThread* p, bool force_daemon) { | |
3522 // The threads lock must be owned at this point | |
3523 assert_locked_or_safepoint(Threads_lock); | |
3524 p->set_next(_thread_list); | |
3525 _thread_list = p; | |
3526 _number_of_threads++; | |
3527 oop threadObj = p->threadObj(); | |
3528 bool daemon = true; | |
3529 // Bootstrapping problem: threadObj can be null for initial | |
3530 // JavaThread (or for threads attached via JNI) | |
3531 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
3532 _number_of_non_daemon_threads++; | |
3533 daemon = false; | |
3534 } | |
3535 | |
3536 ThreadService::add_thread(p, daemon); | |
3537 | |
3538 // Possible GC point. | |
3539 Events::log("Thread added: " INTPTR_FORMAT, p); | |
3540 } | |
3541 | |
3542 void Threads::remove(JavaThread* p) { | |
3543 // Extra scope needed for Thread_lock, so we can check | |
3544 // that we do not remove thread without safepoint code notice | |
3545 { MutexLocker ml(Threads_lock); | |
3546 | |
3547 assert(includes(p), "p must be present"); | |
3548 | |
3549 JavaThread* current = _thread_list; | |
3550 JavaThread* prev = NULL; | |
3551 | |
3552 while (current != p) { | |
3553 prev = current; | |
3554 current = current->next(); | |
3555 } | |
3556 | |
3557 if (prev) { | |
3558 prev->set_next(current->next()); | |
3559 } else { | |
3560 _thread_list = p->next(); | |
3561 } | |
3562 _number_of_threads--; | |
3563 oop threadObj = p->threadObj(); | |
3564 bool daemon = true; | |
3565 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
3566 _number_of_non_daemon_threads--; | |
3567 daemon = false; | |
3568 | |
3569 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
3570 // on destroy_vm will wake up. | |
3571 if (number_of_non_daemon_threads() == 1) | |
3572 Threads_lock->notify_all(); | |
3573 } | |
3574 ThreadService::remove_thread(p, daemon); | |
3575 | |
3576 // Make sure that safepoint code disregard this thread. This is needed since | |
3577 // the thread might mess around with locks after this point. This can cause it | |
3578 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
3579 // of this thread since it is removed from the queue. | |
3580 p->set_terminated_value(); | |
3581 } // unlock Threads_lock | |
3582 | |
3583 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
3584 Events::log("Thread exited: " INTPTR_FORMAT, p); | |
3585 } | |
3586 | |
3587 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
3588 bool Threads::includes(JavaThread* p) { | |
3589 assert(Threads_lock->is_locked(), "sanity check"); | |
3590 ALL_JAVA_THREADS(q) { | |
3591 if (q == p ) { | |
3592 return true; | |
3593 } | |
3594 } | |
3595 return false; | |
3596 } | |
3597 | |
3598 // Operations on the Threads list for GC. These are not explicitly locked, | |
3599 // but the garbage collector must provide a safe context for them to run. | |
3600 // In particular, these things should never be called when the Threads_lock | |
3601 // is held by some other thread. (Note: the Safepoint abstraction also | |
3602 // uses the Threads_lock to gurantee this property. It also makes sure that | |
3603 // all threads gets blocked when exiting or starting). | |
3604 | |
3605 void Threads::oops_do(OopClosure* f) { | |
3606 ALL_JAVA_THREADS(p) { | |
3607 p->oops_do(f); | |
3608 } | |
3609 VMThread::vm_thread()->oops_do(f); | |
3610 } | |
3611 | |
3612 void Threads::possibly_parallel_oops_do(OopClosure* f) { | |
3613 // Introduce a mechanism allowing parallel threads to claim threads as | |
3614 // root groups. Overhead should be small enough to use all the time, | |
3615 // even in sequential code. | |
3616 SharedHeap* sh = SharedHeap::heap(); | |
3617 bool is_par = (sh->n_par_threads() > 0); | |
3618 int cp = SharedHeap::heap()->strong_roots_parity(); | |
3619 ALL_JAVA_THREADS(p) { | |
3620 if (p->claim_oops_do(is_par, cp)) { | |
3621 p->oops_do(f); | |
3622 } | |
3623 } | |
3624 VMThread* vmt = VMThread::vm_thread(); | |
3625 if (vmt->claim_oops_do(is_par, cp)) | |
3626 vmt->oops_do(f); | |
3627 } | |
3628 | |
3629 #ifndef SERIALGC | |
3630 // Used by ParallelScavenge | |
3631 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
3632 ALL_JAVA_THREADS(p) { | |
3633 q->enqueue(new ThreadRootsTask(p)); | |
3634 } | |
3635 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
3636 } | |
3637 | |
3638 // Used by Parallel Old | |
3639 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
3640 ALL_JAVA_THREADS(p) { | |
3641 q->enqueue(new ThreadRootsMarkingTask(p)); | |
3642 } | |
3643 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
3644 } | |
3645 #endif // SERIALGC | |
3646 | |
3647 void Threads::nmethods_do() { | |
3648 ALL_JAVA_THREADS(p) { | |
3649 p->nmethods_do(); | |
3650 } | |
3651 VMThread::vm_thread()->nmethods_do(); | |
3652 } | |
3653 | |
3654 void Threads::gc_epilogue() { | |
3655 ALL_JAVA_THREADS(p) { | |
3656 p->gc_epilogue(); | |
3657 } | |
3658 } | |
3659 | |
3660 void Threads::gc_prologue() { | |
3661 ALL_JAVA_THREADS(p) { | |
3662 p->gc_prologue(); | |
3663 } | |
3664 } | |
3665 | |
3666 void Threads::deoptimized_wrt_marked_nmethods() { | |
3667 ALL_JAVA_THREADS(p) { | |
3668 p->deoptimized_wrt_marked_nmethods(); | |
3669 } | |
3670 } | |
3671 | |
3672 | |
3673 // Get count Java threads that are waiting to enter the specified monitor. | |
3674 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
3675 address monitor, bool doLock) { | |
3676 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
3677 "must grab Threads_lock or be at safepoint"); | |
3678 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
3679 | |
3680 int i = 0; | |
3681 { | |
3682 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
3683 ALL_JAVA_THREADS(p) { | |
3684 if (p->is_Compiler_thread()) continue; | |
3685 | |
3686 address pending = (address)p->current_pending_monitor(); | |
3687 if (pending == monitor) { // found a match | |
3688 if (i < count) result->append(p); // save the first count matches | |
3689 i++; | |
3690 } | |
3691 } | |
3692 } | |
3693 return result; | |
3694 } | |
3695 | |
3696 | |
3697 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
3698 assert(doLock || | |
3699 Threads_lock->owned_by_self() || | |
3700 SafepointSynchronize::is_at_safepoint(), | |
3701 "must grab Threads_lock or be at safepoint"); | |
3702 | |
3703 // NULL owner means not locked so we can skip the search | |
3704 if (owner == NULL) return NULL; | |
3705 | |
3706 { | |
3707 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
3708 ALL_JAVA_THREADS(p) { | |
3709 // first, see if owner is the address of a Java thread | |
3710 if (owner == (address)p) return p; | |
3711 } | |
3712 } | |
3713 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
3714 if (UseHeavyMonitors) return NULL; | |
3715 | |
3716 // | |
3717 // If we didn't find a matching Java thread and we didn't force use of | |
3718 // heavyweight monitors, then the owner is the stack address of the | |
3719 // Lock Word in the owning Java thread's stack. | |
3720 // | |
3721 JavaThread* the_owner = NULL; | |
3722 { | |
3723 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
3724 ALL_JAVA_THREADS(q) { | |
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
3725 if (q->is_lock_owned(owner)) { |
0 | 3726 the_owner = q; |
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
3727 break; |
0 | 3728 } |
3729 } | |
3730 } | |
3731 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
3732 return the_owner; | |
3733 } | |
3734 | |
3735 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
3736 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
3737 char buf[32]; | |
3738 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
3739 | |
3740 st->print_cr("Full thread dump %s (%s %s):", | |
3741 Abstract_VM_Version::vm_name(), | |
3742 Abstract_VM_Version::vm_release(), | |
3743 Abstract_VM_Version::vm_info_string() | |
3744 ); | |
3745 st->cr(); | |
3746 | |
3747 #ifndef SERIALGC | |
3748 // Dump concurrent locks | |
3749 ConcurrentLocksDump concurrent_locks; | |
3750 if (print_concurrent_locks) { | |
3751 concurrent_locks.dump_at_safepoint(); | |
3752 } | |
3753 #endif // SERIALGC | |
3754 | |
3755 ALL_JAVA_THREADS(p) { | |
3756 ResourceMark rm; | |
3757 p->print_on(st); | |
3758 if (print_stacks) { | |
3759 if (internal_format) { | |
3760 p->trace_stack(); | |
3761 } else { | |
3762 p->print_stack_on(st); | |
3763 } | |
3764 } | |
3765 st->cr(); | |
3766 #ifndef SERIALGC | |
3767 if (print_concurrent_locks) { | |
3768 concurrent_locks.print_locks_on(p, st); | |
3769 } | |
3770 #endif // SERIALGC | |
3771 } | |
3772 | |
3773 VMThread::vm_thread()->print_on(st); | |
3774 st->cr(); | |
3775 Universe::heap()->print_gc_threads_on(st); | |
3776 WatcherThread* wt = WatcherThread::watcher_thread(); | |
3777 if (wt != NULL) wt->print_on(st); | |
3778 st->cr(); | |
3779 CompileBroker::print_compiler_threads_on(st); | |
3780 st->flush(); | |
3781 } | |
3782 | |
3783 // Threads::print_on_error() is called by fatal error handler. It's possible | |
3784 // that VM is not at safepoint and/or current thread is inside signal handler. | |
3785 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
3786 // memory (even in resource area), it might deadlock the error handler. | |
3787 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
3788 bool found_current = false; | |
3789 st->print_cr("Java Threads: ( => current thread )"); | |
3790 ALL_JAVA_THREADS(thread) { | |
3791 bool is_current = (current == thread); | |
3792 found_current = found_current || is_current; | |
3793 | |
3794 st->print("%s", is_current ? "=>" : " "); | |
3795 | |
3796 st->print(PTR_FORMAT, thread); | |
3797 st->print(" "); | |
3798 thread->print_on_error(st, buf, buflen); | |
3799 st->cr(); | |
3800 } | |
3801 st->cr(); | |
3802 | |
3803 st->print_cr("Other Threads:"); | |
3804 if (VMThread::vm_thread()) { | |
3805 bool is_current = (current == VMThread::vm_thread()); | |
3806 found_current = found_current || is_current; | |
3807 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
3808 | |
3809 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
3810 st->print(" "); | |
3811 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
3812 st->cr(); | |
3813 } | |
3814 WatcherThread* wt = WatcherThread::watcher_thread(); | |
3815 if (wt != NULL) { | |
3816 bool is_current = (current == wt); | |
3817 found_current = found_current || is_current; | |
3818 st->print("%s", is_current ? "=>" : " "); | |
3819 | |
3820 st->print(PTR_FORMAT, wt); | |
3821 st->print(" "); | |
3822 wt->print_on_error(st, buf, buflen); | |
3823 st->cr(); | |
3824 } | |
3825 if (!found_current) { | |
3826 st->cr(); | |
3827 st->print("=>" PTR_FORMAT " (exited) ", current); | |
3828 current->print_on_error(st, buf, buflen); | |
3829 st->cr(); | |
3830 } | |
3831 } | |
3832 | |
3833 | |
3834 // Lifecycle management for TSM ParkEvents. | |
3835 // ParkEvents are type-stable (TSM). | |
3836 // In our particular implementation they happen to be immortal. | |
3837 // | |
3838 // We manage concurrency on the FreeList with a CAS-based | |
3839 // detach-modify-reattach idiom that avoids the ABA problems | |
3840 // that would otherwise be present in a simple CAS-based | |
3841 // push-pop implementation. (push-one and pop-all) | |
3842 // | |
3843 // Caveat: Allocate() and Release() may be called from threads | |
3844 // other than the thread associated with the Event! | |
3845 // If we need to call Allocate() when running as the thread in | |
3846 // question then look for the PD calls to initialize native TLS. | |
3847 // Native TLS (Win32/Linux/Solaris) can only be initialized or | |
3848 // accessed by the associated thread. | |
3849 // See also pd_initialize(). | |
3850 // | |
3851 // Note that we could defer associating a ParkEvent with a thread | |
3852 // until the 1st time the thread calls park(). unpark() calls to | |
3853 // an unprovisioned thread would be ignored. The first park() call | |
3854 // for a thread would allocate and associate a ParkEvent and return | |
3855 // immediately. | |
3856 | |
3857 volatile int ParkEvent::ListLock = 0 ; | |
3858 ParkEvent * volatile ParkEvent::FreeList = NULL ; | |
3859 | |
3860 ParkEvent * ParkEvent::Allocate (Thread * t) { | |
3861 // In rare cases -- JVM_RawMonitor* operations -- we can find t == null. | |
3862 ParkEvent * ev ; | |
3863 | |
3864 // Start by trying to recycle an existing but unassociated | |
3865 // ParkEvent from the global free list. | |
3866 for (;;) { | |
3867 ev = FreeList ; | |
3868 if (ev == NULL) break ; | |
3869 // 1: Detach - sequester or privatize the list | |
3870 // Tantamount to ev = Swap (&FreeList, NULL) | |
3871 if (Atomic::cmpxchg_ptr (NULL, &FreeList, ev) != ev) { | |
3872 continue ; | |
3873 } | |
3874 | |
3875 // We've detached the list. The list in-hand is now | |
3876 // local to this thread. This thread can operate on the | |
3877 // list without risk of interference from other threads. | |
3878 // 2: Extract -- pop the 1st element from the list. | |
3879 ParkEvent * List = ev->FreeNext ; | |
3880 if (List == NULL) break ; | |
3881 for (;;) { | |
3882 // 3: Try to reattach the residual list | |
3883 guarantee (List != NULL, "invariant") ; | |
3884 ParkEvent * Arv = (ParkEvent *) Atomic::cmpxchg_ptr (List, &FreeList, NULL) ; | |
3885 if (Arv == NULL) break ; | |
3886 | |
3887 // New nodes arrived. Try to detach the recent arrivals. | |
3888 if (Atomic::cmpxchg_ptr (NULL, &FreeList, Arv) != Arv) { | |
3889 continue ; | |
3890 } | |
3891 guarantee (Arv != NULL, "invariant") ; | |
3892 // 4: Merge Arv into List | |
3893 ParkEvent * Tail = List ; | |
3894 while (Tail->FreeNext != NULL) Tail = Tail->FreeNext ; | |
3895 Tail->FreeNext = Arv ; | |
3896 } | |
3897 break ; | |
3898 } | |
3899 | |
3900 if (ev != NULL) { | |
3901 guarantee (ev->AssociatedWith == NULL, "invariant") ; | |
3902 } else { | |
3903 // Do this the hard way -- materialize a new ParkEvent. | |
3904 // In rare cases an allocating thread might detach a long list -- | |
3905 // installing null into FreeList -- and then stall or be obstructed. | |
3906 // A 2nd thread calling Allocate() would see FreeList == null. | |
3907 // The list held privately by the 1st thread is unavailable to the 2nd thread. | |
3908 // In that case the 2nd thread would have to materialize a new ParkEvent, | |
3909 // even though free ParkEvents existed in the system. In this case we end up | |
3910 // with more ParkEvents in circulation than we need, but the race is | |
3911 // rare and the outcome is benign. Ideally, the # of extant ParkEvents | |
3912 // is equal to the maximum # of threads that existed at any one time. | |
3913 // Because of the race mentioned above, segments of the freelist | |
3914 // can be transiently inaccessible. At worst we may end up with the | |
3915 // # of ParkEvents in circulation slightly above the ideal. | |
3916 // Note that if we didn't have the TSM/immortal constraint, then | |
3917 // when reattaching, above, we could trim the list. | |
3918 ev = new ParkEvent () ; | |
3919 guarantee ((intptr_t(ev) & 0xFF) == 0, "invariant") ; | |
3920 } | |
3921 ev->reset() ; // courtesy to caller | |
3922 ev->AssociatedWith = t ; // Associate ev with t | |
3923 ev->FreeNext = NULL ; | |
3924 return ev ; | |
3925 } | |
3926 | |
3927 void ParkEvent::Release (ParkEvent * ev) { | |
3928 if (ev == NULL) return ; | |
3929 guarantee (ev->FreeNext == NULL , "invariant") ; | |
3930 ev->AssociatedWith = NULL ; | |
3931 for (;;) { | |
3932 // Push ev onto FreeList | |
3933 // The mechanism is "half" lock-free. | |
3934 ParkEvent * List = FreeList ; | |
3935 ev->FreeNext = List ; | |
3936 if (Atomic::cmpxchg_ptr (ev, &FreeList, List) == List) break ; | |
3937 } | |
3938 } | |
3939 | |
3940 // Override operator new and delete so we can ensure that the | |
3941 // least significant byte of ParkEvent addresses is 0. | |
3942 // Beware that excessive address alignment is undesirable | |
3943 // as it can result in D$ index usage imbalance as | |
3944 // well as bank access imbalance on Niagara-like platforms, | |
3945 // although Niagara's hash function should help. | |
3946 | |
3947 void * ParkEvent::operator new (size_t sz) { | |
3948 return (void *) ((intptr_t (CHeapObj::operator new (sz + 256)) + 256) & -256) ; | |
3949 } | |
3950 | |
3951 void ParkEvent::operator delete (void * a) { | |
3952 // ParkEvents are type-stable and immortal ... | |
3953 ShouldNotReachHere(); | |
3954 } | |
3955 | |
3956 | |
3957 // 6399321 As a temporary measure we copied & modified the ParkEvent:: | |
3958 // allocate() and release() code for use by Parkers. The Parker:: forms | |
3959 // will eventually be removed as we consolide and shift over to ParkEvents | |
3960 // for both builtin synchronization and JSR166 operations. | |
3961 | |
3962 volatile int Parker::ListLock = 0 ; | |
3963 Parker * volatile Parker::FreeList = NULL ; | |
3964 | |
3965 Parker * Parker::Allocate (JavaThread * t) { | |
3966 guarantee (t != NULL, "invariant") ; | |
3967 Parker * p ; | |
3968 | |
3969 // Start by trying to recycle an existing but unassociated | |
3970 // Parker from the global free list. | |
3971 for (;;) { | |
3972 p = FreeList ; | |
3973 if (p == NULL) break ; | |
3974 // 1: Detach | |
3975 // Tantamount to p = Swap (&FreeList, NULL) | |
3976 if (Atomic::cmpxchg_ptr (NULL, &FreeList, p) != p) { | |
3977 continue ; | |
3978 } | |
3979 | |
3980 // We've detached the list. The list in-hand is now | |
3981 // local to this thread. This thread can operate on the | |
3982 // list without risk of interference from other threads. | |
3983 // 2: Extract -- pop the 1st element from the list. | |
3984 Parker * List = p->FreeNext ; | |
3985 if (List == NULL) break ; | |
3986 for (;;) { | |
3987 // 3: Try to reattach the residual list | |
3988 guarantee (List != NULL, "invariant") ; | |
3989 Parker * Arv = (Parker *) Atomic::cmpxchg_ptr (List, &FreeList, NULL) ; | |
3990 if (Arv == NULL) break ; | |
3991 | |
3992 // New nodes arrived. Try to detach the recent arrivals. | |
3993 if (Atomic::cmpxchg_ptr (NULL, &FreeList, Arv) != Arv) { | |
3994 continue ; | |
3995 } | |
3996 guarantee (Arv != NULL, "invariant") ; | |
3997 // 4: Merge Arv into List | |
3998 Parker * Tail = List ; | |
3999 while (Tail->FreeNext != NULL) Tail = Tail->FreeNext ; | |
4000 Tail->FreeNext = Arv ; | |
4001 } | |
4002 break ; | |
4003 } | |
4004 | |
4005 if (p != NULL) { | |
4006 guarantee (p->AssociatedWith == NULL, "invariant") ; | |
4007 } else { | |
4008 // Do this the hard way -- materialize a new Parker.. | |
4009 // In rare cases an allocating thread might detach | |
4010 // a long list -- installing null into FreeList --and | |
4011 // then stall. Another thread calling Allocate() would see | |
4012 // FreeList == null and then invoke the ctor. In this case we | |
4013 // end up with more Parkers in circulation than we need, but | |
4014 // the race is rare and the outcome is benign. | |
4015 // Ideally, the # of extant Parkers is equal to the | |
4016 // maximum # of threads that existed at any one time. | |
4017 // Because of the race mentioned above, segments of the | |
4018 // freelist can be transiently inaccessible. At worst | |
4019 // we may end up with the # of Parkers in circulation | |
4020 // slightly above the ideal. | |
4021 p = new Parker() ; | |
4022 } | |
4023 p->AssociatedWith = t ; // Associate p with t | |
4024 p->FreeNext = NULL ; | |
4025 return p ; | |
4026 } | |
4027 | |
4028 | |
4029 void Parker::Release (Parker * p) { | |
4030 if (p == NULL) return ; | |
4031 guarantee (p->AssociatedWith != NULL, "invariant") ; | |
4032 guarantee (p->FreeNext == NULL , "invariant") ; | |
4033 p->AssociatedWith = NULL ; | |
4034 for (;;) { | |
4035 // Push p onto FreeList | |
4036 Parker * List = FreeList ; | |
4037 p->FreeNext = List ; | |
4038 if (Atomic::cmpxchg_ptr (p, &FreeList, List) == List) break ; | |
4039 } | |
4040 } | |
4041 | |
4042 void Threads::verify() { | |
4043 ALL_JAVA_THREADS(p) { | |
4044 p->verify(); | |
4045 } | |
4046 VMThread* thread = VMThread::vm_thread(); | |
4047 if (thread != NULL) thread->verify(); | |
4048 } |