Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 6181:f8de958e5b2c
7176856: add the JRE name to the error log
Reviewed-by: coleenp, jrose, kvn, twisti
Contributed-by: Krystal Mok <sajia@taobao.com>
author | twisti |
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date | Mon, 18 Jun 2012 12:29:21 -0700 |
parents | df4cd4aac5c1 |
children | 24b9c7f4cae6 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "code/scopeDesc.hpp" | |
31 #include "compiler/compileBroker.hpp" | |
32 #include "interpreter/interpreter.hpp" | |
33 #include "interpreter/linkResolver.hpp" | |
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34 #include "interpreter/oopMapCache.hpp" |
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35 #include "jvmtifiles/jvmtiEnv.hpp" |
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36 #include "memory/gcLocker.inline.hpp" |
1972 | 37 #include "memory/oopFactory.hpp" |
38 #include "memory/universe.inline.hpp" | |
39 #include "oops/instanceKlass.hpp" | |
40 #include "oops/objArrayOop.hpp" | |
41 #include "oops/oop.inline.hpp" | |
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42 #include "oops/symbol.hpp" |
1972 | 43 #include "prims/jvm_misc.hpp" |
44 #include "prims/jvmtiExport.hpp" | |
45 #include "prims/jvmtiThreadState.hpp" | |
46 #include "prims/privilegedStack.hpp" | |
47 #include "runtime/aprofiler.hpp" | |
48 #include "runtime/arguments.hpp" | |
49 #include "runtime/biasedLocking.hpp" | |
50 #include "runtime/deoptimization.hpp" | |
51 #include "runtime/fprofiler.hpp" | |
52 #include "runtime/frame.inline.hpp" | |
53 #include "runtime/init.hpp" | |
54 #include "runtime/interfaceSupport.hpp" | |
55 #include "runtime/java.hpp" | |
56 #include "runtime/javaCalls.hpp" | |
57 #include "runtime/jniPeriodicChecker.hpp" | |
58 #include "runtime/memprofiler.hpp" | |
59 #include "runtime/mutexLocker.hpp" | |
60 #include "runtime/objectMonitor.hpp" | |
61 #include "runtime/osThread.hpp" | |
62 #include "runtime/safepoint.hpp" | |
63 #include "runtime/sharedRuntime.hpp" | |
64 #include "runtime/statSampler.hpp" | |
65 #include "runtime/stubRoutines.hpp" | |
66 #include "runtime/task.hpp" | |
67 #include "runtime/threadCritical.hpp" | |
68 #include "runtime/threadLocalStorage.hpp" | |
69 #include "runtime/vframe.hpp" | |
70 #include "runtime/vframeArray.hpp" | |
71 #include "runtime/vframe_hp.hpp" | |
72 #include "runtime/vmThread.hpp" | |
73 #include "runtime/vm_operations.hpp" | |
74 #include "services/attachListener.hpp" | |
75 #include "services/management.hpp" | |
76 #include "services/threadService.hpp" | |
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77 #include "trace/traceEventTypes.hpp" |
1972 | 78 #include "utilities/defaultStream.hpp" |
79 #include "utilities/dtrace.hpp" | |
80 #include "utilities/events.hpp" | |
81 #include "utilities/preserveException.hpp" | |
82 #ifdef TARGET_OS_FAMILY_linux | |
83 # include "os_linux.inline.hpp" | |
84 # include "thread_linux.inline.hpp" | |
85 #endif | |
86 #ifdef TARGET_OS_FAMILY_solaris | |
87 # include "os_solaris.inline.hpp" | |
88 # include "thread_solaris.inline.hpp" | |
89 #endif | |
90 #ifdef TARGET_OS_FAMILY_windows | |
91 # include "os_windows.inline.hpp" | |
92 # include "thread_windows.inline.hpp" | |
93 #endif | |
3960 | 94 #ifdef TARGET_OS_FAMILY_bsd |
95 # include "os_bsd.inline.hpp" | |
96 # include "thread_bsd.inline.hpp" | |
97 #endif | |
1972 | 98 #ifndef SERIALGC |
99 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
100 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
101 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
102 #endif | |
103 #ifdef COMPILER1 | |
104 #include "c1/c1_Compiler.hpp" | |
105 #endif | |
106 #ifdef COMPILER2 | |
107 #include "opto/c2compiler.hpp" | |
108 #include "opto/idealGraphPrinter.hpp" | |
109 #endif | |
0 | 110 |
111 #ifdef DTRACE_ENABLED | |
112 | |
113 // Only bother with this argument setup if dtrace is available | |
114 | |
4006 | 115 #ifndef USDT2 |
0 | 116 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
117 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
118 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
119 intptr_t, intptr_t, bool); | |
120 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
121 intptr_t, intptr_t, bool); | |
122 | |
123 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
124 { \ | |
125 ResourceMark rm(this); \ | |
126 int len = 0; \ | |
127 const char* name = (javathread)->get_thread_name(); \ | |
128 len = strlen(name); \ | |
129 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
130 name, len, \ | |
131 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
132 (javathread)->osthread()->thread_id(), \ | |
133 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
134 } | |
135 | |
4006 | 136 #else /* USDT2 */ |
137 | |
138 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
139 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
140 | |
141 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
142 { \ | |
143 ResourceMark rm(this); \ | |
144 int len = 0; \ | |
145 const char* name = (javathread)->get_thread_name(); \ | |
146 len = strlen(name); \ | |
147 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
148 (char *) name, len, \ | |
149 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
150 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
151 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
152 } | |
153 | |
154 #endif /* USDT2 */ | |
155 | |
0 | 156 #else // ndef DTRACE_ENABLED |
157 | |
158 #define DTRACE_THREAD_PROBE(probe, javathread) | |
159 | |
160 #endif // ndef DTRACE_ENABLED | |
161 | |
162 // Class hierarchy | |
163 // - Thread | |
164 // - VMThread | |
165 // - WatcherThread | |
166 // - ConcurrentMarkSweepThread | |
167 // - JavaThread | |
168 // - CompilerThread | |
169 | |
170 // ======= Thread ======== | |
171 | |
172 // Support for forcing alignment of thread objects for biased locking | |
173 void* Thread::operator new(size_t size) { | |
174 if (UseBiasedLocking) { | |
175 const int alignment = markOopDesc::biased_lock_alignment; | |
176 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
177 void* real_malloc_addr = CHeapObj::operator new(aligned_size); | |
178 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); | |
179 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
180 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
181 "JavaThread alignment code overflowed allocated storage"); | |
182 if (TraceBiasedLocking) { | |
183 if (aligned_addr != real_malloc_addr) | |
184 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
185 real_malloc_addr, aligned_addr); | |
186 } | |
187 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
188 return aligned_addr; | |
189 } else { | |
190 return CHeapObj::operator new(size); | |
191 } | |
192 } | |
193 | |
194 void Thread::operator delete(void* p) { | |
195 if (UseBiasedLocking) { | |
196 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
197 CHeapObj::operator delete(real_malloc_addr); | |
198 } else { | |
199 CHeapObj::operator delete(p); | |
200 } | |
201 } | |
202 | |
203 | |
204 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
205 // JavaThread | |
206 | |
207 | |
208 Thread::Thread() { | |
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209 // stack and get_thread |
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210 set_stack_base(NULL); |
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211 set_stack_size(0); |
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212 set_self_raw_id(0); |
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213 set_lgrp_id(-1); |
0 | 214 |
215 // allocated data structures | |
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216 set_osthread(NULL); |
0 | 217 set_resource_area(new ResourceArea()); |
218 set_handle_area(new HandleArea(NULL)); | |
219 set_active_handles(NULL); | |
220 set_free_handle_block(NULL); | |
221 set_last_handle_mark(NULL); | |
222 | |
223 // This initial value ==> never claimed. | |
224 _oops_do_parity = 0; | |
225 | |
226 // the handle mark links itself to last_handle_mark | |
227 new HandleMark(this); | |
228 | |
229 // plain initialization | |
230 debug_only(_owned_locks = NULL;) | |
231 debug_only(_allow_allocation_count = 0;) | |
232 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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233 NOT_PRODUCT(_skip_gcalot = false;) |
0 | 234 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
235 _jvmti_env_iteration_count = 0; | |
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236 set_allocated_bytes(0); |
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237 set_trace_buffer(NULL); |
0 | 238 _vm_operation_started_count = 0; |
239 _vm_operation_completed_count = 0; | |
240 _current_pending_monitor = NULL; | |
241 _current_pending_monitor_is_from_java = true; | |
242 _current_waiting_monitor = NULL; | |
243 _num_nested_signal = 0; | |
244 omFreeList = NULL ; | |
245 omFreeCount = 0 ; | |
246 omFreeProvision = 32 ; | |
1587 | 247 omInUseList = NULL ; |
248 omInUseCount = 0 ; | |
0 | 249 |
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250 #ifdef ASSERT |
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251 _visited_for_critical_count = false; |
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252 #endif |
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253 |
0 | 254 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
255 _suspend_flags = 0; | |
256 | |
257 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
258 _hashStateX = os::random() ; | |
259 _hashStateY = 842502087 ; | |
260 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
261 _hashStateW = 273326509 ; | |
262 | |
263 _OnTrap = 0 ; | |
264 _schedctl = NULL ; | |
265 _Stalled = 0 ; | |
266 _TypeTag = 0x2BAD ; | |
267 | |
268 // Many of the following fields are effectively final - immutable | |
269 // Note that nascent threads can't use the Native Monitor-Mutex | |
270 // construct until the _MutexEvent is initialized ... | |
271 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
272 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
273 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
274 // and ::Release() | |
275 _ParkEvent = ParkEvent::Allocate (this) ; | |
276 _SleepEvent = ParkEvent::Allocate (this) ; | |
277 _MutexEvent = ParkEvent::Allocate (this) ; | |
278 _MuxEvent = ParkEvent::Allocate (this) ; | |
279 | |
280 #ifdef CHECK_UNHANDLED_OOPS | |
281 if (CheckUnhandledOops) { | |
282 _unhandled_oops = new UnhandledOops(this); | |
283 } | |
284 #endif // CHECK_UNHANDLED_OOPS | |
285 #ifdef ASSERT | |
286 if (UseBiasedLocking) { | |
287 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
288 assert(this == _real_malloc_address || | |
289 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
290 "bug in forced alignment of thread objects"); | |
291 } | |
292 #endif /* ASSERT */ | |
293 } | |
294 | |
295 void Thread::initialize_thread_local_storage() { | |
296 // Note: Make sure this method only calls | |
297 // non-blocking operations. Otherwise, it might not work | |
298 // with the thread-startup/safepoint interaction. | |
299 | |
300 // During Java thread startup, safepoint code should allow this | |
301 // method to complete because it may need to allocate memory to | |
302 // store information for the new thread. | |
303 | |
304 // initialize structure dependent on thread local storage | |
305 ThreadLocalStorage::set_thread(this); | |
306 | |
307 // set up any platform-specific state. | |
308 os::initialize_thread(); | |
309 | |
310 } | |
311 | |
312 void Thread::record_stack_base_and_size() { | |
313 set_stack_base(os::current_stack_base()); | |
314 set_stack_size(os::current_stack_size()); | |
315 } | |
316 | |
317 | |
318 Thread::~Thread() { | |
319 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
320 ObjectSynchronizer::omFlush (this) ; | |
321 | |
322 // deallocate data structures | |
323 delete resource_area(); | |
324 // since the handle marks are using the handle area, we have to deallocated the root | |
325 // handle mark before deallocating the thread's handle area, | |
326 assert(last_handle_mark() != NULL, "check we have an element"); | |
327 delete last_handle_mark(); | |
328 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
329 | |
330 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
331 // We NULL out the fields for good hygiene. | |
332 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
333 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
334 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
335 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
336 | |
337 delete handle_area(); | |
338 | |
339 // osthread() can be NULL, if creation of thread failed. | |
340 if (osthread() != NULL) os::free_thread(osthread()); | |
341 | |
342 delete _SR_lock; | |
343 | |
344 // clear thread local storage if the Thread is deleting itself | |
345 if (this == Thread::current()) { | |
346 ThreadLocalStorage::set_thread(NULL); | |
347 } else { | |
348 // In the case where we're not the current thread, invalidate all the | |
349 // caches in case some code tries to get the current thread or the | |
350 // thread that was destroyed, and gets stale information. | |
351 ThreadLocalStorage::invalidate_all(); | |
352 } | |
353 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
354 } | |
355 | |
356 // NOTE: dummy function for assertion purpose. | |
357 void Thread::run() { | |
358 ShouldNotReachHere(); | |
359 } | |
360 | |
361 #ifdef ASSERT | |
362 // Private method to check for dangling thread pointer | |
363 void check_for_dangling_thread_pointer(Thread *thread) { | |
364 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
365 "possibility of dangling Thread pointer"); | |
366 } | |
367 #endif | |
368 | |
369 | |
370 #ifndef PRODUCT | |
371 // Tracing method for basic thread operations | |
372 void Thread::trace(const char* msg, const Thread* const thread) { | |
373 if (!TraceThreadEvents) return; | |
374 ResourceMark rm; | |
375 ThreadCritical tc; | |
376 const char *name = "non-Java thread"; | |
377 int prio = -1; | |
378 if (thread->is_Java_thread() | |
379 && !thread->is_Compiler_thread()) { | |
380 // The Threads_lock must be held to get information about | |
381 // this thread but may not be in some situations when | |
382 // tracing thread events. | |
383 bool release_Threads_lock = false; | |
384 if (!Threads_lock->owned_by_self()) { | |
385 Threads_lock->lock(); | |
386 release_Threads_lock = true; | |
387 } | |
388 JavaThread* jt = (JavaThread *)thread; | |
389 name = (char *)jt->get_thread_name(); | |
390 oop thread_oop = jt->threadObj(); | |
391 if (thread_oop != NULL) { | |
392 prio = java_lang_Thread::priority(thread_oop); | |
393 } | |
394 if (release_Threads_lock) { | |
395 Threads_lock->unlock(); | |
396 } | |
397 } | |
398 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
399 } | |
400 #endif | |
401 | |
402 | |
403 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
404 trace("get priority", thread); | |
405 ThreadPriority priority; | |
406 // Can return an error! | |
407 (void)os::get_priority(thread, priority); | |
408 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
409 return priority; | |
410 } | |
411 | |
412 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
413 trace("set priority", thread); | |
414 debug_only(check_for_dangling_thread_pointer(thread);) | |
415 // Can return an error! | |
416 (void)os::set_priority(thread, priority); | |
417 } | |
418 | |
419 | |
420 void Thread::start(Thread* thread) { | |
421 trace("start", thread); | |
422 // Start is different from resume in that its safety is guaranteed by context or | |
423 // being called from a Java method synchronized on the Thread object. | |
424 if (!DisableStartThread) { | |
425 if (thread->is_Java_thread()) { | |
426 // Initialize the thread state to RUNNABLE before starting this thread. | |
427 // Can not set it after the thread started because we do not know the | |
428 // exact thread state at that time. It could be in MONITOR_WAIT or | |
429 // in SLEEPING or some other state. | |
430 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
431 java_lang_Thread::RUNNABLE); | |
432 } | |
433 os::start_thread(thread); | |
434 } | |
435 } | |
436 | |
437 // Enqueue a VM_Operation to do the job for us - sometime later | |
438 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
439 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
440 VMThread::execute(vm_stop); | |
441 } | |
442 | |
443 | |
444 // | |
445 // Check if an external suspend request has completed (or has been | |
446 // cancelled). Returns true if the thread is externally suspended and | |
447 // false otherwise. | |
448 // | |
449 // The bits parameter returns information about the code path through | |
450 // the routine. Useful for debugging: | |
451 // | |
452 // set in is_ext_suspend_completed(): | |
453 // 0x00000001 - routine was entered | |
454 // 0x00000010 - routine return false at end | |
455 // 0x00000100 - thread exited (return false) | |
456 // 0x00000200 - suspend request cancelled (return false) | |
457 // 0x00000400 - thread suspended (return true) | |
458 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
459 // 0x00002000 - thread is native and walkable (return true) | |
460 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
461 // | |
462 // set in wait_for_ext_suspend_completion(): | |
463 // 0x00010000 - routine was entered | |
464 // 0x00020000 - suspend request cancelled before loop (return false) | |
465 // 0x00040000 - thread suspended before loop (return true) | |
466 // 0x00080000 - suspend request cancelled in loop (return false) | |
467 // 0x00100000 - thread suspended in loop (return true) | |
468 // 0x00200000 - suspend not completed during retry loop (return false) | |
469 // | |
470 | |
471 // Helper class for tracing suspend wait debug bits. | |
472 // | |
473 // 0x00000100 indicates that the target thread exited before it could | |
474 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
475 // 0x00080000 each indicate a cancelled suspend request so they don't | |
476 // count as wait failures either. | |
477 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
478 | |
479 class TraceSuspendDebugBits : public StackObj { | |
480 private: | |
481 JavaThread * jt; | |
482 bool is_wait; | |
483 bool called_by_wait; // meaningful when !is_wait | |
484 uint32_t * bits; | |
485 | |
486 public: | |
487 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
488 uint32_t *_bits) { | |
489 jt = _jt; | |
490 is_wait = _is_wait; | |
491 called_by_wait = _called_by_wait; | |
492 bits = _bits; | |
493 } | |
494 | |
495 ~TraceSuspendDebugBits() { | |
496 if (!is_wait) { | |
497 #if 1 | |
498 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
499 // That trace is very chatty. | |
500 return; | |
501 #else | |
502 if (!called_by_wait) { | |
503 // If tracing for is_ext_suspend_completed() is enabled, then only | |
504 // trace calls to it from wait_for_ext_suspend_completion() | |
505 return; | |
506 } | |
507 #endif | |
508 } | |
509 | |
510 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
511 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
512 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
513 ResourceMark rm; | |
514 | |
515 tty->print_cr( | |
516 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
517 jt->get_thread_name(), *bits); | |
518 | |
519 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
520 } | |
521 } | |
522 } | |
523 }; | |
524 #undef DEBUG_FALSE_BITS | |
525 | |
526 | |
527 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
528 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
529 | |
530 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
531 bool do_trans_retry; // flag to force the retry | |
532 | |
533 *bits |= 0x00000001; | |
534 | |
535 do { | |
536 do_trans_retry = false; | |
537 | |
538 if (is_exiting()) { | |
539 // Thread is in the process of exiting. This is always checked | |
540 // first to reduce the risk of dereferencing a freed JavaThread. | |
541 *bits |= 0x00000100; | |
542 return false; | |
543 } | |
544 | |
545 if (!is_external_suspend()) { | |
546 // Suspend request is cancelled. This is always checked before | |
547 // is_ext_suspended() to reduce the risk of a rogue resume | |
548 // confusing the thread that made the suspend request. | |
549 *bits |= 0x00000200; | |
550 return false; | |
551 } | |
552 | |
553 if (is_ext_suspended()) { | |
554 // thread is suspended | |
555 *bits |= 0x00000400; | |
556 return true; | |
557 } | |
558 | |
559 // Now that we no longer do hard suspends of threads running | |
560 // native code, the target thread can be changing thread state | |
561 // while we are in this routine: | |
562 // | |
563 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
564 // | |
565 // We save a copy of the thread state as observed at this moment | |
566 // and make our decision about suspend completeness based on the | |
567 // copy. This closes the race where the thread state is seen as | |
568 // _thread_in_native_trans in the if-thread_blocked check, but is | |
569 // seen as _thread_blocked in if-thread_in_native_trans check. | |
570 JavaThreadState save_state = thread_state(); | |
571 | |
572 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
573 // If the thread's state is _thread_blocked and this blocking | |
574 // condition is known to be equivalent to a suspend, then we can | |
575 // consider the thread to be externally suspended. This means that | |
576 // the code that sets _thread_blocked has been modified to do | |
577 // self-suspension if the blocking condition releases. We also | |
578 // used to check for CONDVAR_WAIT here, but that is now covered by | |
579 // the _thread_blocked with self-suspension check. | |
580 // | |
581 // Return true since we wouldn't be here unless there was still an | |
582 // external suspend request. | |
583 *bits |= 0x00001000; | |
584 return true; | |
585 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
586 // Threads running native code will self-suspend on native==>VM/Java | |
587 // transitions. If its stack is walkable (should always be the case | |
588 // unless this function is called before the actual java_suspend() | |
589 // call), then the wait is done. | |
590 *bits |= 0x00002000; | |
591 return true; | |
592 } else if (!called_by_wait && !did_trans_retry && | |
593 save_state == _thread_in_native_trans && | |
594 frame_anchor()->walkable()) { | |
595 // The thread is transitioning from thread_in_native to another | |
596 // thread state. check_safepoint_and_suspend_for_native_trans() | |
597 // will force the thread to self-suspend. If it hasn't gotten | |
598 // there yet we may have caught the thread in-between the native | |
599 // code check above and the self-suspend. Lucky us. If we were | |
600 // called by wait_for_ext_suspend_completion(), then it | |
601 // will be doing the retries so we don't have to. | |
602 // | |
603 // Since we use the saved thread state in the if-statement above, | |
604 // there is a chance that the thread has already transitioned to | |
605 // _thread_blocked by the time we get here. In that case, we will | |
606 // make a single unnecessary pass through the logic below. This | |
607 // doesn't hurt anything since we still do the trans retry. | |
608 | |
609 *bits |= 0x00004000; | |
610 | |
611 // Once the thread leaves thread_in_native_trans for another | |
612 // thread state, we break out of this retry loop. We shouldn't | |
613 // need this flag to prevent us from getting back here, but | |
614 // sometimes paranoia is good. | |
615 did_trans_retry = true; | |
616 | |
617 // We wait for the thread to transition to a more usable state. | |
618 for (int i = 1; i <= SuspendRetryCount; i++) { | |
619 // We used to do an "os::yield_all(i)" call here with the intention | |
620 // that yielding would increase on each retry. However, the parameter | |
621 // is ignored on Linux which means the yield didn't scale up. Waiting | |
622 // on the SR_lock below provides a much more predictable scale up for | |
623 // the delay. It also provides a simple/direct point to check for any | |
624 // safepoint requests from the VMThread | |
625 | |
626 // temporarily drops SR_lock while doing wait with safepoint check | |
627 // (if we're a JavaThread - the WatcherThread can also call this) | |
628 // and increase delay with each retry | |
629 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
630 | |
631 // check the actual thread state instead of what we saved above | |
632 if (thread_state() != _thread_in_native_trans) { | |
633 // the thread has transitioned to another thread state so | |
634 // try all the checks (except this one) one more time. | |
635 do_trans_retry = true; | |
636 break; | |
637 } | |
638 } // end retry loop | |
639 | |
640 | |
641 } | |
642 } while (do_trans_retry); | |
643 | |
644 *bits |= 0x00000010; | |
645 return false; | |
646 } | |
647 | |
648 // | |
649 // Wait for an external suspend request to complete (or be cancelled). | |
650 // Returns true if the thread is externally suspended and false otherwise. | |
651 // | |
652 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
653 uint32_t *bits) { | |
654 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
655 false /* !called_by_wait */, bits); | |
656 | |
657 // local flag copies to minimize SR_lock hold time | |
658 bool is_suspended; | |
659 bool pending; | |
660 uint32_t reset_bits; | |
661 | |
662 // set a marker so is_ext_suspend_completed() knows we are the caller | |
663 *bits |= 0x00010000; | |
664 | |
665 // We use reset_bits to reinitialize the bits value at the top of | |
666 // each retry loop. This allows the caller to make use of any | |
667 // unused bits for their own marking purposes. | |
668 reset_bits = *bits; | |
669 | |
670 { | |
671 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
672 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
673 delay, bits); | |
674 pending = is_external_suspend(); | |
675 } | |
676 // must release SR_lock to allow suspension to complete | |
677 | |
678 if (!pending) { | |
679 // A cancelled suspend request is the only false return from | |
680 // is_ext_suspend_completed() that keeps us from entering the | |
681 // retry loop. | |
682 *bits |= 0x00020000; | |
683 return false; | |
684 } | |
685 | |
686 if (is_suspended) { | |
687 *bits |= 0x00040000; | |
688 return true; | |
689 } | |
690 | |
691 for (int i = 1; i <= retries; i++) { | |
692 *bits = reset_bits; // reinit to only track last retry | |
693 | |
694 // We used to do an "os::yield_all(i)" call here with the intention | |
695 // that yielding would increase on each retry. However, the parameter | |
696 // is ignored on Linux which means the yield didn't scale up. Waiting | |
697 // on the SR_lock below provides a much more predictable scale up for | |
698 // the delay. It also provides a simple/direct point to check for any | |
699 // safepoint requests from the VMThread | |
700 | |
701 { | |
702 MutexLocker ml(SR_lock()); | |
703 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
704 // can also call this) and increase delay with each retry | |
705 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
706 | |
707 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
708 delay, bits); | |
709 | |
710 // It is possible for the external suspend request to be cancelled | |
711 // (by a resume) before the actual suspend operation is completed. | |
712 // Refresh our local copy to see if we still need to wait. | |
713 pending = is_external_suspend(); | |
714 } | |
715 | |
716 if (!pending) { | |
717 // A cancelled suspend request is the only false return from | |
718 // is_ext_suspend_completed() that keeps us from staying in the | |
719 // retry loop. | |
720 *bits |= 0x00080000; | |
721 return false; | |
722 } | |
723 | |
724 if (is_suspended) { | |
725 *bits |= 0x00100000; | |
726 return true; | |
727 } | |
728 } // end retry loop | |
729 | |
730 // thread did not suspend after all our retries | |
731 *bits |= 0x00200000; | |
732 return false; | |
733 } | |
734 | |
735 #ifndef PRODUCT | |
736 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
737 | |
738 // This should not need to be atomic as the only way for simultaneous | |
739 // updates is via interrupts. Even then this should be rare or non-existant | |
740 // and we don't care that much anyway. | |
741 | |
742 int index = _jmp_ring_index; | |
743 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
744 _jmp_ring[index]._target = (intptr_t) target; | |
745 _jmp_ring[index]._instruction = (intptr_t) instr; | |
746 _jmp_ring[index]._file = file; | |
747 _jmp_ring[index]._line = line; | |
748 } | |
749 #endif /* PRODUCT */ | |
750 | |
751 // Called by flat profiler | |
752 // Callers have already called wait_for_ext_suspend_completion | |
753 // The assertion for that is currently too complex to put here: | |
754 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
755 bool gotframe = false; | |
756 // self suspension saves needed state. | |
757 if (has_last_Java_frame() && _anchor.walkable()) { | |
758 *_fr = pd_last_frame(); | |
759 gotframe = true; | |
760 } | |
761 return gotframe; | |
762 } | |
763 | |
764 void Thread::interrupt(Thread* thread) { | |
765 trace("interrupt", thread); | |
766 debug_only(check_for_dangling_thread_pointer(thread);) | |
767 os::interrupt(thread); | |
768 } | |
769 | |
770 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
771 trace("is_interrupted", thread); | |
772 debug_only(check_for_dangling_thread_pointer(thread);) | |
773 // Note: If clear_interrupted==false, this simply fetches and | |
774 // returns the value of the field osthread()->interrupted(). | |
775 return os::is_interrupted(thread, clear_interrupted); | |
776 } | |
777 | |
778 | |
779 // GC Support | |
780 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
781 jint thread_parity = _oops_do_parity; | |
782 if (thread_parity != strong_roots_parity) { | |
783 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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784 if (res == thread_parity) { |
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785 return true; |
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786 } else { |
0 | 787 guarantee(res == strong_roots_parity, "Or else what?"); |
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788 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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789 "Should only fail when parallel."); |
0 | 790 return false; |
791 } | |
792 } | |
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793 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
0 | 794 "Should only fail when parallel."); |
795 return false; | |
796 } | |
797 | |
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798 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 799 active_handles()->oops_do(f); |
800 // Do oop for ThreadShadow | |
801 f->do_oop((oop*)&_pending_exception); | |
802 handle_area()->oops_do(f); | |
803 } | |
804 | |
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805 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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806 // no nmethods in a generic thread... |
0 | 807 } |
808 | |
809 void Thread::print_on(outputStream* st) const { | |
810 // get_priority assumes osthread initialized | |
811 if (osthread() != NULL) { | |
812 st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this); | |
813 osthread()->print_on(st); | |
814 } | |
815 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
816 } | |
817 | |
818 // Thread::print_on_error() is called by fatal error handler. Don't use | |
819 // any lock or allocate memory. | |
820 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
821 if (is_VM_thread()) st->print("VMThread"); | |
822 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
823 else if (is_Java_thread()) st->print("JavaThread"); | |
824 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
825 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
826 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
827 else st->print("Thread"); | |
828 | |
829 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
830 _stack_base - _stack_size, _stack_base); | |
831 | |
832 if (osthread()) { | |
833 st->print(" [id=%d]", osthread()->thread_id()); | |
834 } | |
835 } | |
836 | |
837 #ifdef ASSERT | |
838 void Thread::print_owned_locks_on(outputStream* st) const { | |
839 Monitor *cur = _owned_locks; | |
840 if (cur == NULL) { | |
841 st->print(" (no locks) "); | |
842 } else { | |
843 st->print_cr(" Locks owned:"); | |
844 while(cur) { | |
845 cur->print_on(st); | |
846 cur = cur->next(); | |
847 } | |
848 } | |
849 } | |
850 | |
851 static int ref_use_count = 0; | |
852 | |
853 bool Thread::owns_locks_but_compiled_lock() const { | |
854 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
855 if (cur != Compile_lock) return true; | |
856 } | |
857 return false; | |
858 } | |
859 | |
860 | |
861 #endif | |
862 | |
863 #ifndef PRODUCT | |
864 | |
865 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
866 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
867 // no threads which allow_vm_block's are held | |
868 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
869 // Check if current thread is allowed to block at a safepoint | |
870 if (!(_allow_safepoint_count == 0)) | |
871 fatal("Possible safepoint reached by thread that does not allow it"); | |
872 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
873 fatal("LEAF method calling lock?"); | |
874 } | |
875 | |
876 #ifdef ASSERT | |
877 if (potential_vm_operation && is_Java_thread() | |
878 && !Universe::is_bootstrapping()) { | |
879 // Make sure we do not hold any locks that the VM thread also uses. | |
880 // This could potentially lead to deadlocks | |
881 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
882 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
883 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
884 // since it is used to transfer control between JavaThreads and the VMThread | |
885 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
886 if ( (cur->allow_vm_block() && | |
887 cur != Threads_lock && | |
888 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
889 cur != VMOperationRequest_lock && | |
890 cur != VMOperationQueue_lock) || | |
891 cur->rank() == Mutex::special) { | |
892 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
893 } | |
894 } | |
895 } | |
896 | |
897 if (GCALotAtAllSafepoints) { | |
898 // We could enter a safepoint here and thus have a gc | |
899 InterfaceSupport::check_gc_alot(); | |
900 } | |
901 #endif | |
902 } | |
903 #endif | |
904 | |
905 bool Thread::is_in_stack(address adr) const { | |
906 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
907 address end = os::current_stack_pointer(); | |
908 if (stack_base() >= adr && adr >= end) return true; | |
909 | |
910 return false; | |
911 } | |
912 | |
913 | |
914 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
915 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
916 // used for compilation in the future. If that change is made, the need for these methods | |
917 // should be revisited, and they should be removed if possible. | |
918 | |
919 bool Thread::is_lock_owned(address adr) const { | |
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920 return on_local_stack(adr); |
0 | 921 } |
922 | |
923 bool Thread::set_as_starting_thread() { | |
924 // NOTE: this must be called inside the main thread. | |
925 return os::create_main_thread((JavaThread*)this); | |
926 } | |
927 | |
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928 static void initialize_class(Symbol* class_name, TRAPS) { |
0 | 929 klassOop klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
930 instanceKlass::cast(klass)->initialize(CHECK); | |
931 } | |
932 | |
933 | |
934 // Creates the initial ThreadGroup | |
935 static Handle create_initial_thread_group(TRAPS) { | |
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936 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
0 | 937 instanceKlassHandle klass (THREAD, k); |
938 | |
939 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
940 { | |
941 JavaValue result(T_VOID); | |
942 JavaCalls::call_special(&result, | |
943 system_instance, | |
944 klass, | |
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945 vmSymbols::object_initializer_name(), |
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946 vmSymbols::void_method_signature(), |
0 | 947 CHECK_NH); |
948 } | |
949 Universe::set_system_thread_group(system_instance()); | |
950 | |
951 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
952 { | |
953 JavaValue result(T_VOID); | |
954 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
955 JavaCalls::call_special(&result, | |
956 main_instance, | |
957 klass, | |
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958 vmSymbols::object_initializer_name(), |
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959 vmSymbols::threadgroup_string_void_signature(), |
0 | 960 system_instance, |
961 string, | |
962 CHECK_NH); | |
963 } | |
964 return main_instance; | |
965 } | |
966 | |
967 // Creates the initial Thread | |
968 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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969 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
0 | 970 instanceKlassHandle klass (THREAD, k); |
971 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
972 | |
973 java_lang_Thread::set_thread(thread_oop(), thread); | |
974 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
975 thread->set_threadObj(thread_oop()); | |
976 | |
977 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
978 | |
979 JavaValue result(T_VOID); | |
980 JavaCalls::call_special(&result, thread_oop, | |
981 klass, | |
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982 vmSymbols::object_initializer_name(), |
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983 vmSymbols::threadgroup_string_void_signature(), |
0 | 984 thread_group, |
985 string, | |
986 CHECK_NULL); | |
987 return thread_oop(); | |
988 } | |
989 | |
990 static void call_initializeSystemClass(TRAPS) { | |
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991 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 992 instanceKlassHandle klass (THREAD, k); |
993 | |
994 JavaValue result(T_VOID); | |
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995 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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996 vmSymbols::void_method_signature(), CHECK); |
0 | 997 } |
998 | |
6181 | 999 char java_runtime_name[128] = ""; |
1000 | |
1001 // extract the JRE name from sun.misc.Version.java_runtime_name | |
1002 static const char* get_java_runtime_name(TRAPS) { | |
1003 klassOop k = SystemDictionary::find(vmSymbols::sun_misc_Version(), | |
1004 Handle(), Handle(), CHECK_AND_CLEAR_NULL); | |
1005 fieldDescriptor fd; | |
1006 bool found = k != NULL && | |
1007 instanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), | |
1008 vmSymbols::string_signature(), &fd); | |
1009 if (found) { | |
1010 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
1011 if (name_oop == NULL) | |
1012 return NULL; | |
1013 const char* name = java_lang_String::as_utf8_string(name_oop, | |
1014 java_runtime_name, | |
1015 sizeof(java_runtime_name)); | |
1016 return name; | |
1017 } else { | |
1018 return NULL; | |
1019 } | |
1020 } | |
1021 | |
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1022 // General purpose hook into Java code, run once when the VM is initialized. |
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1023 // The Java library method itself may be changed independently from the VM. |
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1024 static void call_postVMInitHook(TRAPS) { |
3938 | 1025 klassOop k = SystemDictionary::PostVMInitHook_klass(); |
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1026 instanceKlassHandle klass (THREAD, k); |
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1027 if (klass.not_null()) { |
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1028 JavaValue result(T_VOID); |
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1029 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1030 vmSymbols::void_method_signature(), |
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1031 CHECK); |
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1032 } |
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1033 } |
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1034 |
0 | 1035 static void reset_vm_info_property(TRAPS) { |
1036 // the vm info string | |
1037 ResourceMark rm(THREAD); | |
1038 const char *vm_info = VM_Version::vm_info_string(); | |
1039 | |
1040 // java.lang.System class | |
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1041 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1042 instanceKlassHandle klass (THREAD, k); |
1043 | |
1044 // setProperty arguments | |
1045 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
1046 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
1047 | |
1048 // return value | |
1049 JavaValue r(T_OBJECT); | |
1050 | |
1051 // public static String setProperty(String key, String value); | |
1052 JavaCalls::call_static(&r, | |
1053 klass, | |
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1054 vmSymbols::setProperty_name(), |
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1055 vmSymbols::string_string_string_signature(), |
0 | 1056 key_str, |
1057 value_str, | |
1058 CHECK); | |
1059 } | |
1060 | |
1061 | |
1062 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
1063 assert(thread_group.not_null(), "thread group should be specified"); | |
1064 assert(threadObj() == NULL, "should only create Java thread object once"); | |
1065 | |
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1066 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 1067 instanceKlassHandle klass (THREAD, k); |
1068 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
1069 | |
1070 java_lang_Thread::set_thread(thread_oop(), this); | |
1071 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1072 set_threadObj(thread_oop()); | |
1073 | |
1074 JavaValue result(T_VOID); | |
1075 if (thread_name != NULL) { | |
1076 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
1077 // Thread gets assigned specified name and null target | |
1078 JavaCalls::call_special(&result, | |
1079 thread_oop, | |
1080 klass, | |
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1081 vmSymbols::object_initializer_name(), |
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1082 vmSymbols::threadgroup_string_void_signature(), |
0 | 1083 thread_group, // Argument 1 |
1084 name, // Argument 2 | |
1085 THREAD); | |
1086 } else { | |
1087 // Thread gets assigned name "Thread-nnn" and null target | |
1088 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
1089 JavaCalls::call_special(&result, | |
1090 thread_oop, | |
1091 klass, | |
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1092 vmSymbols::object_initializer_name(), |
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1093 vmSymbols::threadgroup_runnable_void_signature(), |
0 | 1094 thread_group, // Argument 1 |
1095 Handle(), // Argument 2 | |
1096 THREAD); | |
1097 } | |
1098 | |
1099 | |
1100 if (daemon) { | |
1101 java_lang_Thread::set_daemon(thread_oop()); | |
1102 } | |
1103 | |
1104 if (HAS_PENDING_EXCEPTION) { | |
1105 return; | |
1106 } | |
1107 | |
1142 | 1108 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
0 | 1109 Handle threadObj(this, this->threadObj()); |
1110 | |
1111 JavaCalls::call_special(&result, | |
1112 thread_group, | |
1113 group, | |
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1114 vmSymbols::add_method_name(), |
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1115 vmSymbols::thread_void_signature(), |
0 | 1116 threadObj, // Arg 1 |
1117 THREAD); | |
1118 | |
1119 | |
1120 } | |
1121 | |
1122 // NamedThread -- non-JavaThread subclasses with multiple | |
1123 // uniquely named instances should derive from this. | |
1124 NamedThread::NamedThread() : Thread() { | |
1125 _name = NULL; | |
1119
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1126 _processed_thread = NULL; |
0 | 1127 } |
1128 | |
1129 NamedThread::~NamedThread() { | |
1130 if (_name != NULL) { | |
1131 FREE_C_HEAP_ARRAY(char, _name); | |
1132 _name = NULL; | |
1133 } | |
1134 } | |
1135 | |
1136 void NamedThread::set_name(const char* format, ...) { | |
1137 guarantee(_name == NULL, "Only get to set name once."); | |
1138 _name = NEW_C_HEAP_ARRAY(char, max_name_len); | |
1139 guarantee(_name != NULL, "alloc failure"); | |
1140 va_list ap; | |
1141 va_start(ap, format); | |
1142 jio_vsnprintf(_name, max_name_len, format, ap); | |
1143 va_end(ap); | |
1144 } | |
1145 | |
1146 // ======= WatcherThread ======== | |
1147 | |
1148 // The watcher thread exists to simulate timer interrupts. It should | |
1149 // be replaced by an abstraction over whatever native support for | |
1150 // timer interrupts exists on the platform. | |
1151 | |
1152 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
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1153 volatile bool WatcherThread::_should_terminate = false; |
0 | 1154 |
1155 WatcherThread::WatcherThread() : Thread() { | |
1156 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
1157 if (os::create_thread(this, os::watcher_thread)) { | |
1158 _watcher_thread = this; | |
1159 | |
1160 // Set the watcher thread to the highest OS priority which should not be | |
1161 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1162 // is created. The only normal thread using this priority is the reference | |
1163 // handler thread, which runs for very short intervals only. | |
1164 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1165 // will be inaccurate. | |
1166 os::set_priority(this, MaxPriority); | |
1167 if (!DisableStartThread) { | |
1168 os::start_thread(this); | |
1169 } | |
1170 } | |
1171 } | |
1172 | |
1173 void WatcherThread::run() { | |
1174 assert(this == watcher_thread(), "just checking"); | |
1175 | |
1176 this->record_stack_base_and_size(); | |
1177 this->initialize_thread_local_storage(); | |
1178 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1179 while(!_should_terminate) { | |
1180 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1181 assert(watcher_thread() == this, "thread consistency check"); | |
1182 | |
1183 // Calculate how long it'll be until the next PeriodicTask work | |
1184 // should be done, and sleep that amount of time. | |
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1185 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1186 |
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1187 // we expect this to timeout - we only ever get unparked when |
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1188 // we should terminate |
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1189 { |
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1190 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1191 |
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1192 jlong prev_time = os::javaTimeNanos(); |
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1193 for (;;) { |
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1194 int res= _SleepEvent->park(time_to_wait); |
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1195 if (res == OS_TIMEOUT || _should_terminate) |
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1196 break; |
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1197 // spurious wakeup of some kind |
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1198 jlong now = os::javaTimeNanos(); |
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1199 time_to_wait -= (now - prev_time) / 1000000; |
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1200 if (time_to_wait <= 0) |
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1201 break; |
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1202 prev_time = now; |
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1203 } |
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1204 } |
0 | 1205 |
1206 if (is_error_reported()) { | |
1207 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1208 // should abort JVM after creating an error log file. However in some | |
1209 // rare cases, the error handler itself might deadlock. Here we try to | |
1210 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1211 // | |
1212 // This code is in WatcherThread because WatcherThread wakes up | |
1213 // periodically so the fatal error handler doesn't need to do anything; | |
1214 // also because the WatcherThread is less likely to crash than other | |
1215 // threads. | |
1216 | |
1217 for (;;) { | |
1218 if (!ShowMessageBoxOnError | |
1219 && (OnError == NULL || OnError[0] == '\0') | |
1220 && Arguments::abort_hook() == NULL) { | |
1221 os::sleep(this, 2 * 60 * 1000, false); | |
1222 fdStream err(defaultStream::output_fd()); | |
1223 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1224 // skip atexit/vm_exit/vm_abort hooks | |
1225 os::die(); | |
1226 } | |
1227 | |
1228 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1229 // ShowMessageBoxOnError when it is ready to abort. | |
1230 os::sleep(this, 5 * 1000, false); | |
1231 } | |
1232 } | |
1233 | |
1234 PeriodicTask::real_time_tick(time_to_wait); | |
1235 | |
1236 // If we have no more tasks left due to dynamic disenrollment, | |
1237 // shut down the thread since we don't currently support dynamic enrollment | |
1238 if (PeriodicTask::num_tasks() == 0) { | |
1239 _should_terminate = true; | |
1240 } | |
1241 } | |
1242 | |
1243 // Signal that it is terminated | |
1244 { | |
1245 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1246 _watcher_thread = NULL; | |
1247 Terminator_lock->notify(); | |
1248 } | |
1249 | |
1250 // Thread destructor usually does this.. | |
1251 ThreadLocalStorage::set_thread(NULL); | |
1252 } | |
1253 | |
1254 void WatcherThread::start() { | |
1255 if (watcher_thread() == NULL) { | |
1256 _should_terminate = false; | |
1257 // Create the single instance of WatcherThread | |
1258 new WatcherThread(); | |
1259 } | |
1260 } | |
1261 | |
1262 void WatcherThread::stop() { | |
1263 // it is ok to take late safepoints here, if needed | |
1264 MutexLocker mu(Terminator_lock); | |
1265 _should_terminate = true; | |
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1266 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1267 |
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1268 Thread* watcher = watcher_thread(); |
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1269 if (watcher != NULL) |
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1270 watcher->_SleepEvent->unpark(); |
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1271 |
0 | 1272 while(watcher_thread() != NULL) { |
1273 // This wait should make safepoint checks, wait without a timeout, | |
1274 // and wait as a suspend-equivalent condition. | |
1275 // | |
1276 // Note: If the FlatProfiler is running, then this thread is waiting | |
1277 // for the WatcherThread to terminate and the WatcherThread, via the | |
1278 // FlatProfiler task, is waiting for the external suspend request on | |
1279 // this thread to complete. wait_for_ext_suspend_completion() will | |
1280 // eventually timeout, but that takes time. Making this wait a | |
1281 // suspend-equivalent condition solves that timeout problem. | |
1282 // | |
1283 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1284 Mutex::_as_suspend_equivalent_flag); | |
1285 } | |
1286 } | |
1287 | |
1288 void WatcherThread::print_on(outputStream* st) const { | |
1289 st->print("\"%s\" ", name()); | |
1290 Thread::print_on(st); | |
1291 st->cr(); | |
1292 } | |
1293 | |
1294 // ======= JavaThread ======== | |
1295 | |
1296 // A JavaThread is a normal Java thread | |
1297 | |
1298 void JavaThread::initialize() { | |
1299 // Initialize fields | |
342
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1300 |
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1301 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1302 set_claimed_par_id(-1); |
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1303 |
0 | 1304 set_saved_exception_pc(NULL); |
1305 set_threadObj(NULL); | |
1306 _anchor.clear(); | |
1307 set_entry_point(NULL); | |
1308 set_jni_functions(jni_functions()); | |
1309 set_callee_target(NULL); | |
1310 set_vm_result(NULL); | |
1311 set_vm_result_2(NULL); | |
1312 set_vframe_array_head(NULL); | |
1313 set_vframe_array_last(NULL); | |
1314 set_deferred_locals(NULL); | |
1315 set_deopt_mark(NULL); | |
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1316 set_deopt_nmethod(NULL); |
0 | 1317 clear_must_deopt_id(); |
1318 set_monitor_chunks(NULL); | |
1319 set_next(NULL); | |
1320 set_thread_state(_thread_new); | |
1321 _terminated = _not_terminated; | |
1322 _privileged_stack_top = NULL; | |
1323 _array_for_gc = NULL; | |
1324 _suspend_equivalent = false; | |
1325 _in_deopt_handler = 0; | |
1326 _doing_unsafe_access = false; | |
1327 _stack_guard_state = stack_guard_unused; | |
1328 _exception_oop = NULL; | |
1329 _exception_pc = 0; | |
1330 _exception_handler_pc = 0; | |
1903 | 1331 _is_method_handle_return = 0; |
0 | 1332 _jvmti_thread_state= NULL; |
1213
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1333 _should_post_on_exceptions_flag = JNI_FALSE; |
0 | 1334 _jvmti_get_loaded_classes_closure = NULL; |
1335 _interp_only_mode = 0; | |
1336 _special_runtime_exit_condition = _no_async_condition; | |
1337 _pending_async_exception = NULL; | |
1338 _is_compiling = false; | |
1339 _thread_stat = NULL; | |
1340 _thread_stat = new ThreadStatistics(); | |
1341 _blocked_on_compilation = false; | |
1342 _jni_active_critical = 0; | |
1343 _do_not_unlock_if_synchronized = false; | |
1344 _cached_monitor_info = NULL; | |
1345 _parker = Parker::Allocate(this) ; | |
1346 | |
1347 #ifndef PRODUCT | |
1348 _jmp_ring_index = 0; | |
1349 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1350 record_jump(NULL, NULL, NULL, 0); | |
1351 } | |
1352 #endif /* PRODUCT */ | |
1353 | |
1354 set_thread_profiler(NULL); | |
1355 if (FlatProfiler::is_active()) { | |
1356 // This is where we would decide to either give each thread it's own profiler | |
1357 // or use one global one from FlatProfiler, | |
1358 // or up to some count of the number of profiled threads, etc. | |
1359 ThreadProfiler* pp = new ThreadProfiler(); | |
1360 pp->engage(); | |
1361 set_thread_profiler(pp); | |
1362 } | |
1363 | |
1364 // Setup safepoint state info for this thread | |
1365 ThreadSafepointState::create(this); | |
1366 | |
1367 debug_only(_java_call_counter = 0); | |
1368 | |
1369 // JVMTI PopFrame support | |
1370 _popframe_condition = popframe_inactive; | |
1371 _popframe_preserved_args = NULL; | |
1372 _popframe_preserved_args_size = 0; | |
1373 | |
1374 pd_initialize(); | |
1375 } | |
1376 | |
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1377 #ifndef SERIALGC |
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1378 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1379 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1380 #endif // !SERIALGC |
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1381 |
4006 | 1382 JavaThread::JavaThread(bool is_attaching_via_jni) : |
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1383 Thread() |
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1384 #ifndef SERIALGC |
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1385 , _satb_mark_queue(&_satb_mark_queue_set), |
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1386 _dirty_card_queue(&_dirty_card_queue_set) |
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1387 #endif // !SERIALGC |
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1388 { |
0 | 1389 initialize(); |
4006 | 1390 if (is_attaching_via_jni) { |
1391 _jni_attach_state = _attaching_via_jni; | |
1392 } else { | |
1393 _jni_attach_state = _not_attaching_via_jni; | |
1394 } | |
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1395 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
0 | 1396 } |
1397 | |
1398 bool JavaThread::reguard_stack(address cur_sp) { | |
1399 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1400 return true; // Stack already guarded or guard pages not needed. | |
1401 } | |
1402 | |
1403 if (register_stack_overflow()) { | |
1404 // For those architectures which have separate register and | |
1405 // memory stacks, we must check the register stack to see if | |
1406 // it has overflowed. | |
1407 return false; | |
1408 } | |
1409 | |
1410 // Java code never executes within the yellow zone: the latter is only | |
1411 // there to provoke an exception during stack banging. If java code | |
1412 // is executing there, either StackShadowPages should be larger, or | |
1413 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1414 // when it should. | |
1415 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1416 | |
1417 enable_stack_yellow_zone(); | |
1418 return true; | |
1419 } | |
1420 | |
1421 bool JavaThread::reguard_stack(void) { | |
1422 return reguard_stack(os::current_stack_pointer()); | |
1423 } | |
1424 | |
1425 | |
1426 void JavaThread::block_if_vm_exited() { | |
1427 if (_terminated == _vm_exited) { | |
1428 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1429 // we will block here forever | |
1430 Threads_lock->lock_without_safepoint_check(); | |
1431 ShouldNotReachHere(); | |
1432 } | |
1433 } | |
1434 | |
1435 | |
1436 // Remove this ifdef when C1 is ported to the compiler interface. | |
1437 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1438 | |
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1439 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1440 Thread() |
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1441 #ifndef SERIALGC |
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1442 , _satb_mark_queue(&_satb_mark_queue_set), |
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1443 _dirty_card_queue(&_dirty_card_queue_set) |
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1444 #endif // !SERIALGC |
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1445 { |
0 | 1446 if (TraceThreadEvents) { |
1447 tty->print_cr("creating thread %p", this); | |
1448 } | |
1449 initialize(); | |
4006 | 1450 _jni_attach_state = _not_attaching_via_jni; |
0 | 1451 set_entry_point(entry_point); |
1452 // Create the native thread itself. | |
1453 // %note runtime_23 | |
1454 os::ThreadType thr_type = os::java_thread; | |
1455 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1456 os::java_thread; | |
1457 os::create_thread(this, thr_type, stack_sz); | |
1458 | |
1459 // The _osthread may be NULL here because we ran out of memory (too many threads active). | |
1460 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1461 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1462 // the exception consists of creating the exception object & initializing it, initialization | |
1463 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1464 // | |
1465 // The thread is still suspended when we reach here. Thread must be explicit started | |
1466 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1467 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1468 // object must be fully initialized (take a look at JVM_Start) | |
1469 } | |
1470 | |
1471 JavaThread::~JavaThread() { | |
1472 if (TraceThreadEvents) { | |
1473 tty->print_cr("terminate thread %p", this); | |
1474 } | |
1475 | |
1476 // JSR166 -- return the parker to the free list | |
1477 Parker::Release(_parker); | |
1478 _parker = NULL ; | |
1479 | |
1480 // Free any remaining previous UnrollBlock | |
1481 vframeArray* old_array = vframe_array_last(); | |
1482 | |
1483 if (old_array != NULL) { | |
1484 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1485 old_array->set_unroll_block(NULL); | |
1486 delete old_info; | |
1487 delete old_array; | |
1488 } | |
1489 | |
1490 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1491 if (deferred != NULL) { | |
1492 // This can only happen if thread is destroyed before deoptimization occurs. | |
1493 assert(deferred->length() != 0, "empty array!"); | |
1494 do { | |
1495 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1496 deferred->remove_at(0); | |
1497 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1498 delete dlv; | |
1499 } while (deferred->length() != 0); | |
1500 delete deferred; | |
1501 } | |
1502 | |
1503 // All Java related clean up happens in exit | |
1504 ThreadSafepointState::destroy(this); | |
1505 if (_thread_profiler != NULL) delete _thread_profiler; | |
1506 if (_thread_stat != NULL) delete _thread_stat; | |
1507 } | |
1508 | |
1509 | |
1510 // The first routine called by a new Java thread | |
1511 void JavaThread::run() { | |
1512 // initialize thread-local alloc buffer related fields | |
1513 this->initialize_tlab(); | |
1514 | |
1515 // used to test validitity of stack trace backs | |
1516 this->record_base_of_stack_pointer(); | |
1517 | |
1518 // Record real stack base and size. | |
1519 this->record_stack_base_and_size(); | |
1520 | |
1521 // Initialize thread local storage; set before calling MutexLocker | |
1522 this->initialize_thread_local_storage(); | |
1523 | |
1524 this->create_stack_guard_pages(); | |
1525 | |
1681
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1526 this->cache_global_variables(); |
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1527 |
0 | 1528 // Thread is now sufficient initialized to be handled by the safepoint code as being |
1529 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1530 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1531 | |
1532 assert(JavaThread::current() == this, "sanity check"); | |
1533 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1534 | |
1535 DTRACE_THREAD_PROBE(start, this); | |
1536 | |
1537 // This operation might block. We call that after all safepoint checks for a new thread has | |
1538 // been completed. | |
1539 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1540 | |
1541 if (JvmtiExport::should_post_thread_life()) { | |
1542 JvmtiExport::post_thread_start(this); | |
1543 } | |
1544 | |
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1545 EVENT_BEGIN(TraceEventThreadStart, event); |
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1546 EVENT_COMMIT(event, |
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1547 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1548 |
0 | 1549 // We call another function to do the rest so we are sure that the stack addresses used |
1550 // from there will be lower than the stack base just computed | |
1551 thread_main_inner(); | |
1552 | |
1553 // Note, thread is no longer valid at this point! | |
1554 } | |
1555 | |
1556 | |
1557 void JavaThread::thread_main_inner() { | |
1558 assert(JavaThread::current() == this, "sanity check"); | |
1559 assert(this->threadObj() != NULL, "just checking"); | |
1560 | |
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1561 // Execute thread entry point unless this thread has a pending exception |
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1562 // or has been stopped before starting. |
0 | 1563 // Note: Due to JVM_StopThread we can have pending exceptions already! |
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1564 if (!this->has_pending_exception() && |
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1565 !java_lang_Thread::is_stillborn(this->threadObj())) { |
4006 | 1566 { |
1567 ResourceMark rm(this); | |
1568 this->set_native_thread_name(this->get_thread_name()); | |
1569 } | |
0 | 1570 HandleMark hm(this); |
1571 this->entry_point()(this, this); | |
1572 } | |
1573 | |
1574 DTRACE_THREAD_PROBE(stop, this); | |
1575 | |
1576 this->exit(false); | |
1577 delete this; | |
1578 } | |
1579 | |
1580 | |
1581 static void ensure_join(JavaThread* thread) { | |
1582 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1583 Handle threadObj(thread, thread->threadObj()); | |
1584 assert(threadObj.not_null(), "java thread object must exist"); | |
1585 ObjectLocker lock(threadObj, thread); | |
1586 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1587 thread->clear_pending_exception(); | |
1588 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1589 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
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1590 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1591 // to complete once we've done the notify_all below |
0 | 1592 java_lang_Thread::set_thread(threadObj(), NULL); |
1593 lock.notify_all(thread); | |
1594 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1595 thread->clear_pending_exception(); | |
1596 } | |
1597 | |
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1598 |
0 | 1599 // For any new cleanup additions, please check to see if they need to be applied to |
1600 // cleanup_failed_attach_current_thread as well. | |
1601 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
1602 assert(this == JavaThread::current(), "thread consistency check"); | |
1603 if (!InitializeJavaLangSystem) return; | |
1604 | |
1605 HandleMark hm(this); | |
1606 Handle uncaught_exception(this, this->pending_exception()); | |
1607 this->clear_pending_exception(); | |
1608 Handle threadObj(this, this->threadObj()); | |
1609 assert(threadObj.not_null(), "Java thread object should be created"); | |
1610 | |
1611 if (get_thread_profiler() != NULL) { | |
1612 get_thread_profiler()->disengage(); | |
1613 ResourceMark rm; | |
1614 get_thread_profiler()->print(get_thread_name()); | |
1615 } | |
1616 | |
1617 | |
1618 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
1619 { | |
1620 EXCEPTION_MARK; | |
1621 | |
1622 CLEAR_PENDING_EXCEPTION; | |
1623 } | |
1624 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
1625 // has to be fixed by a runtime query method | |
1626 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
1627 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
1628 // java.lang.Thread.dispatchUncaughtException | |
1629 if (uncaught_exception.not_null()) { | |
1630 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
1631 { | |
1632 EXCEPTION_MARK; | |
1633 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
1634 // call it. Otherwise we have an older library without the JSR-166 changes, | |
1635 // so call ThreadGroup.uncaughtException() | |
1636 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
1637 CallInfo callinfo; | |
1142 | 1638 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1639 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
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1640 vmSymbols::dispatchUncaughtException_name(), |
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1641 vmSymbols::throwable_void_signature(), |
0 | 1642 KlassHandle(), false, false, THREAD); |
1643 CLEAR_PENDING_EXCEPTION; | |
1644 methodHandle method = callinfo.selected_method(); | |
1645 if (method.not_null()) { | |
1646 JavaValue result(T_VOID); | |
1647 JavaCalls::call_virtual(&result, | |
1648 threadObj, thread_klass, | |
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1649 vmSymbols::dispatchUncaughtException_name(), |
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1650 vmSymbols::throwable_void_signature(), |
0 | 1651 uncaught_exception, |
1652 THREAD); | |
1653 } else { | |
1142 | 1654 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 1655 JavaValue result(T_VOID); |
1656 JavaCalls::call_virtual(&result, | |
1657 group, thread_group, | |
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1658 vmSymbols::uncaughtException_name(), |
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1659 vmSymbols::thread_throwable_void_signature(), |
0 | 1660 threadObj, // Arg 1 |
1661 uncaught_exception, // Arg 2 | |
1662 THREAD); | |
1663 } | |
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1664 if (HAS_PENDING_EXCEPTION) { |
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1665 ResourceMark rm(this); |
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1666 jio_fprintf(defaultStream::error_stream(), |
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1667 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1668 " in thread \"%s\"\n", |
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1669 Klass::cast(pending_exception()->klass())->external_name(), |
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1670 get_thread_name()); |
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1671 CLEAR_PENDING_EXCEPTION; |
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1672 } |
0 | 1673 } |
1674 } | |
1675 | |
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1676 // Called before the java thread exit since we want to read info |
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1677 // from java_lang_Thread object |
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1678 EVENT_BEGIN(TraceEventThreadEnd, event); |
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1679 EVENT_COMMIT(event, |
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1680 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1681 |
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1682 // Call after last event on thread |
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1683 EVENT_THREAD_EXIT(this); |
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1684 |
0 | 1685 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
1686 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1687 // is deprecated anyhow. | |
1688 { int count = 3; | |
1689 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
1690 EXCEPTION_MARK; | |
1691 JavaValue result(T_VOID); | |
1142 | 1692 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1693 JavaCalls::call_virtual(&result, |
1694 threadObj, thread_klass, | |
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1695 vmSymbols::exit_method_name(), |
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1696 vmSymbols::void_method_signature(), |
0 | 1697 THREAD); |
1698 CLEAR_PENDING_EXCEPTION; | |
1699 } | |
1700 } | |
1701 | |
1702 // notify JVMTI | |
1703 if (JvmtiExport::should_post_thread_life()) { | |
1704 JvmtiExport::post_thread_end(this); | |
1705 } | |
1706 | |
1707 // We have notified the agents that we are exiting, before we go on, | |
1708 // we must check for a pending external suspend request and honor it | |
1709 // in order to not surprise the thread that made the suspend request. | |
1710 while (true) { | |
1711 { | |
1712 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1713 if (!is_external_suspend()) { | |
1714 set_terminated(_thread_exiting); | |
1715 ThreadService::current_thread_exiting(this); | |
1716 break; | |
1717 } | |
1718 // Implied else: | |
1719 // Things get a little tricky here. We have a pending external | |
1720 // suspend request, but we are holding the SR_lock so we | |
1721 // can't just self-suspend. So we temporarily drop the lock | |
1722 // and then self-suspend. | |
1723 } | |
1724 | |
1725 ThreadBlockInVM tbivm(this); | |
1726 java_suspend_self(); | |
1727 | |
1728 // We're done with this suspend request, but we have to loop around | |
1729 // and check again. Eventually we will get SR_lock without a pending | |
1730 // external suspend request and will be able to mark ourselves as | |
1731 // exiting. | |
1732 } | |
1733 // no more external suspends are allowed at this point | |
1734 } else { | |
1735 // before_exit() has already posted JVMTI THREAD_END events | |
1736 } | |
1737 | |
1738 // Notify waiters on thread object. This has to be done after exit() is called | |
1739 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1740 // group should have the destroyed bit set before waiters are notified). | |
1741 ensure_join(this); | |
1742 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1743 | |
1744 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1745 // held by this thread must be released. A detach operation must only | |
1746 // get here if there are no Java frames on the stack. Therefore, any | |
1747 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1748 // pre-inflated and in the monitor cache. | |
1749 // | |
1750 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1751 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1752 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1753 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1754 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1755 } | |
1756 | |
1757 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1758 // is in a consistent state, in case GC happens | |
1759 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1760 | |
1761 if (active_handles() != NULL) { | |
1762 JNIHandleBlock* block = active_handles(); | |
1763 set_active_handles(NULL); | |
1764 JNIHandleBlock::release_block(block); | |
1765 } | |
1766 | |
1767 if (free_handle_block() != NULL) { | |
1768 JNIHandleBlock* block = free_handle_block(); | |
1769 set_free_handle_block(NULL); | |
1770 JNIHandleBlock::release_block(block); | |
1771 } | |
1772 | |
1773 // These have to be removed while this is still a valid thread. | |
1774 remove_stack_guard_pages(); | |
1775 | |
1776 if (UseTLAB) { | |
1777 tlab().make_parsable(true); // retire TLAB | |
1778 } | |
1779 | |
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1780 if (JvmtiEnv::environments_might_exist()) { |
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1781 JvmtiExport::cleanup_thread(this); |
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1782 } |
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1783 |
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1784 #ifndef SERIALGC |
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1785 // We must flush G1-related buffers before removing a thread from |
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1786 // the list of active threads. |
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1787 if (UseG1GC) { |
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1788 flush_barrier_queues(); |
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1789 } |
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1790 #endif |
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1791 |
0 | 1792 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1793 Threads::remove(this); | |
1794 } | |
1795 | |
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1796 #ifndef SERIALGC |
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1797 // Flush G1-related queues. |
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1798 void JavaThread::flush_barrier_queues() { |
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1799 satb_mark_queue().flush(); |
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1800 dirty_card_queue().flush(); |
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1801 } |
1842
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1802 |
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1803 void JavaThread::initialize_queues() { |
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1804 assert(!SafepointSynchronize::is_at_safepoint(), |
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1805 "we should not be at a safepoint"); |
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1806 |
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1807 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1808 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1809 // The SATB queue should have been constructed with its active |
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1810 // field set to false. |
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1811 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1812 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1813 // If we are creating the thread during a marking cycle, we should |
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1814 // set the active field of the SATB queue to true. |
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1815 if (satb_queue_set.is_active()) { |
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1816 satb_queue.set_active(true); |
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1817 } |
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1818 |
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1819 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1820 // The dirty card queue should have been constructed with its |
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1821 // active field set to true. |
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1822 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1823 } |
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1824 #endif // !SERIALGC |
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1825 |
0 | 1826 void JavaThread::cleanup_failed_attach_current_thread() { |
441
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1827 if (get_thread_profiler() != NULL) { |
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1828 get_thread_profiler()->disengage(); |
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1829 ResourceMark rm; |
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1830 get_thread_profiler()->print(get_thread_name()); |
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1831 } |
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1832 |
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1833 if (active_handles() != NULL) { |
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1834 JNIHandleBlock* block = active_handles(); |
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1835 set_active_handles(NULL); |
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1836 JNIHandleBlock::release_block(block); |
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1837 } |
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1838 |
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1839 if (free_handle_block() != NULL) { |
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1840 JNIHandleBlock* block = free_handle_block(); |
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1841 set_free_handle_block(NULL); |
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1842 JNIHandleBlock::release_block(block); |
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1843 } |
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1844 |
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1845 // These have to be removed while this is still a valid thread. |
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1846 remove_stack_guard_pages(); |
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1847 |
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1848 if (UseTLAB) { |
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1849 tlab().make_parsable(true); // retire TLAB, if any |
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1850 } |
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1851 |
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1852 #ifndef SERIALGC |
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1853 if (UseG1GC) { |
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1854 flush_barrier_queues(); |
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1855 } |
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1856 #endif |
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1857 |
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1858 Threads::remove(this); |
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1859 delete this; |
0 | 1860 } |
1861 | |
1862 | |
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1863 |
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1864 |
0 | 1865 JavaThread* JavaThread::active() { |
1866 Thread* thread = ThreadLocalStorage::thread(); | |
1867 assert(thread != NULL, "just checking"); | |
1868 if (thread->is_Java_thread()) { | |
1869 return (JavaThread*) thread; | |
1870 } else { | |
1871 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
1872 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
1873 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
1874 assert(ret->is_Java_thread(), "must be a Java thread"); | |
1875 return ret; | |
1876 } | |
1877 } | |
1878 | |
1879 bool JavaThread::is_lock_owned(address adr) const { | |
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1880 if (Thread::is_lock_owned(adr)) return true; |
0 | 1881 |
1882 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
1883 if (chunk->contains(adr)) return true; | |
1884 } | |
1885 | |
1886 return false; | |
1887 } | |
1888 | |
1889 | |
1890 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
1891 chunk->set_next(monitor_chunks()); | |
1892 set_monitor_chunks(chunk); | |
1893 } | |
1894 | |
1895 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
1896 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
1897 if (monitor_chunks() == chunk) { | |
1898 set_monitor_chunks(chunk->next()); | |
1899 } else { | |
1900 MonitorChunk* prev = monitor_chunks(); | |
1901 while (prev->next() != chunk) prev = prev->next(); | |
1902 prev->set_next(chunk->next()); | |
1903 } | |
1904 } | |
1905 | |
1906 // JVM support. | |
1907 | |
1908 // Note: this function shouldn't block if it's called in | |
1909 // _thread_in_native_trans state (such as from | |
1910 // check_special_condition_for_native_trans()). | |
1911 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
1912 | |
1913 if (has_last_Java_frame() && has_async_condition()) { | |
1914 // If we are at a polling page safepoint (not a poll return) | |
1915 // then we must defer async exception because live registers | |
1916 // will be clobbered by the exception path. Poll return is | |
1917 // ok because the call we a returning from already collides | |
1918 // with exception handling registers and so there is no issue. | |
1919 // (The exception handling path kills call result registers but | |
1920 // this is ok since the exception kills the result anyway). | |
1921 | |
1922 if (is_at_poll_safepoint()) { | |
1923 // if the code we are returning to has deoptimized we must defer | |
1924 // the exception otherwise live registers get clobbered on the | |
1925 // exception path before deoptimization is able to retrieve them. | |
1926 // | |
1927 RegisterMap map(this, false); | |
1928 frame caller_fr = last_frame().sender(&map); | |
1929 assert(caller_fr.is_compiled_frame(), "what?"); | |
1930 if (caller_fr.is_deoptimized_frame()) { | |
1931 if (TraceExceptions) { | |
1932 ResourceMark rm; | |
1933 tty->print_cr("deferred async exception at compiled safepoint"); | |
1934 } | |
1935 return; | |
1936 } | |
1937 } | |
1938 } | |
1939 | |
1940 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
1941 if (condition == _no_async_condition) { | |
1942 // Conditions have changed since has_special_runtime_exit_condition() | |
1943 // was called: | |
1944 // - if we were here only because of an external suspend request, | |
1945 // then that was taken care of above (or cancelled) so we are done | |
1946 // - if we were here because of another async request, then it has | |
1947 // been cleared between the has_special_runtime_exit_condition() | |
1948 // and now so again we are done | |
1949 return; | |
1950 } | |
1951 | |
1952 // Check for pending async. exception | |
1953 if (_pending_async_exception != NULL) { | |
1954 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1142 | 1955 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 1956 |
1957 // We cannot call Exceptions::_throw(...) here because we cannot block | |
1958 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
1959 | |
1960 if (TraceExceptions) { | |
1961 ResourceMark rm; | |
1962 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
1963 if (has_last_Java_frame() ) { | |
1964 frame f = last_frame(); | |
1965 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
1966 } | |
1967 tty->print_cr(" of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
1968 } | |
1969 _pending_async_exception = NULL; | |
1970 clear_has_async_exception(); | |
1971 } | |
1972 } | |
1973 | |
1974 if (check_unsafe_error && | |
1975 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
1976 condition = _no_async_condition; // done | |
1977 switch (thread_state()) { | |
1978 case _thread_in_vm: | |
1979 { | |
1980 JavaThread* THREAD = this; | |
1981 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
1982 } | |
1983 case _thread_in_native: | |
1984 { | |
1985 ThreadInVMfromNative tiv(this); | |
1986 JavaThread* THREAD = this; | |
1987 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
1988 } | |
1989 case _thread_in_Java: | |
1990 { | |
1991 ThreadInVMfromJava tiv(this); | |
1992 JavaThread* THREAD = this; | |
1993 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
1994 } | |
1995 default: | |
1996 ShouldNotReachHere(); | |
1997 } | |
1998 } | |
1999 | |
2000 assert(condition == _no_async_condition || has_pending_exception() || | |
2001 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
2002 "must have handled the async condition, if no exception"); | |
2003 } | |
2004 | |
2005 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
2006 // | |
2007 // Check for pending external suspend. Internal suspend requests do | |
2008 // not use handle_special_runtime_exit_condition(). | |
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 bool do_self_suspend = is_external_suspend_with_lock(); | |
2014 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
2015 // | |
2016 // Because thread is external suspended the safepoint code will count | |
2017 // thread as at a safepoint. This can be odd because we can be here | |
2018 // as _thread_in_Java which would normally transition to _thread_blocked | |
2019 // at a safepoint. We would like to mark the thread as _thread_blocked | |
2020 // before calling java_suspend_self like all other callers of it but | |
2021 // we must then observe proper safepoint protocol. (We can't leave | |
2022 // _thread_blocked with a safepoint in progress). However we can be | |
2023 // here as _thread_in_native_trans so we can't use a normal transition | |
2024 // constructor/destructor pair because they assert on that type of | |
2025 // transition. We could do something like: | |
2026 // | |
2027 // JavaThreadState state = thread_state(); | |
2028 // set_thread_state(_thread_in_vm); | |
2029 // { | |
2030 // ThreadBlockInVM tbivm(this); | |
2031 // java_suspend_self() | |
2032 // } | |
2033 // set_thread_state(_thread_in_vm_trans); | |
2034 // if (safepoint) block; | |
2035 // set_thread_state(state); | |
2036 // | |
2037 // but that is pretty messy. Instead we just go with the way the | |
2038 // code has worked before and note that this is the only path to | |
2039 // java_suspend_self that doesn't put the thread in _thread_blocked | |
2040 // mode. | |
2041 | |
2042 frame_anchor()->make_walkable(this); | |
2043 java_suspend_self(); | |
2044 | |
2045 // We might be here for reasons in addition to the self-suspend request | |
2046 // so check for other async requests. | |
2047 } | |
2048 | |
2049 if (check_asyncs) { | |
2050 check_and_handle_async_exceptions(); | |
2051 } | |
2052 } | |
2053 | |
2054 void JavaThread::send_thread_stop(oop java_throwable) { | |
2055 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
2056 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
2057 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
2058 | |
2059 // Do not throw asynchronous exceptions against the compiler thread | |
2060 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
2061 if (is_Compiler_thread()) return; | |
2062 | |
2063 { | |
2064 // Actually throw the Throwable against the target Thread - however | |
2065 // only if there is no thread death exception installed already. | |
1142 | 2066 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2067 // If the topmost frame is a runtime stub, then we are calling into |
2068 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
2069 // must deoptimize the caller before continuing, as the compiled exception handler table | |
2070 // may not be valid | |
2071 if (has_last_Java_frame()) { | |
2072 frame f = last_frame(); | |
2073 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
2074 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2075 RegisterMap reg_map(this, UseBiasedLocking); | |
2076 frame compiled_frame = f.sender(®_map); | |
2077 if (compiled_frame.can_be_deoptimized()) { | |
2078 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
2079 } | |
2080 } | |
2081 } | |
2082 | |
2083 // Set async. pending exception in thread. | |
2084 set_pending_async_exception(java_throwable); | |
2085 | |
2086 if (TraceExceptions) { | |
2087 ResourceMark rm; | |
2088 tty->print_cr("Pending Async. exception installed of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
2089 } | |
2090 // for AbortVMOnException flag | |
2091 NOT_PRODUCT(Exceptions::debug_check_abort(instanceKlass::cast(_pending_async_exception->klass())->external_name())); | |
2092 } | |
2093 } | |
2094 | |
2095 | |
2096 // Interrupt thread so it will wake up from a potential wait() | |
2097 Thread::interrupt(this); | |
2098 } | |
2099 | |
2100 // External suspension mechanism. | |
2101 // | |
2102 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
2103 // to any VM_locks and it is at a transition | |
2104 // Self-suspension will happen on the transition out of the vm. | |
2105 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
2106 // | |
2107 // Guarantees on return: | |
2108 // + Target thread will not execute any new bytecode (that's why we need to | |
2109 // force a safepoint) | |
2110 // + Target thread will not enter any new monitors | |
2111 // | |
2112 void JavaThread::java_suspend() { | |
2113 { MutexLocker mu(Threads_lock); | |
2114 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
2115 return; | |
2116 } | |
2117 } | |
2118 | |
2119 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2120 if (!is_external_suspend()) { | |
2121 // a racing resume has cancelled us; bail out now | |
2122 return; | |
2123 } | |
2124 | |
2125 // suspend is done | |
2126 uint32_t debug_bits = 0; | |
2127 // Warning: is_ext_suspend_completed() may temporarily drop the | |
2128 // SR_lock to allow the thread to reach a stable thread state if | |
2129 // it is currently in a transient thread state. | |
2130 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
2131 SuspendRetryDelay, &debug_bits) ) { | |
2132 return; | |
2133 } | |
2134 } | |
2135 | |
2136 VM_ForceSafepoint vm_suspend; | |
2137 VMThread::execute(&vm_suspend); | |
2138 } | |
2139 | |
2140 // Part II of external suspension. | |
2141 // A JavaThread self suspends when it detects a pending external suspend | |
2142 // request. This is usually on transitions. It is also done in places | |
2143 // where continuing to the next transition would surprise the caller, | |
2144 // e.g., monitor entry. | |
2145 // | |
2146 // Returns the number of times that the thread self-suspended. | |
2147 // | |
2148 // Note: DO NOT call java_suspend_self() when you just want to block current | |
2149 // thread. java_suspend_self() is the second stage of cooperative | |
2150 // suspension for external suspend requests and should only be used | |
2151 // to complete an external suspend request. | |
2152 // | |
2153 int JavaThread::java_suspend_self() { | |
2154 int ret = 0; | |
2155 | |
2156 // we are in the process of exiting so don't suspend | |
2157 if (is_exiting()) { | |
2158 clear_external_suspend(); | |
2159 return ret; | |
2160 } | |
2161 | |
2162 assert(_anchor.walkable() || | |
2163 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
2164 "must have walkable stack"); | |
2165 | |
2166 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2167 | |
979 | 2168 assert(!this->is_ext_suspended(), |
0 | 2169 "a thread trying to self-suspend should not already be suspended"); |
2170 | |
2171 if (this->is_suspend_equivalent()) { | |
2172 // If we are self-suspending as a result of the lifting of a | |
2173 // suspend equivalent condition, then the suspend_equivalent | |
2174 // flag is not cleared until we set the ext_suspended flag so | |
2175 // that wait_for_ext_suspend_completion() returns consistent | |
2176 // results. | |
2177 this->clear_suspend_equivalent(); | |
2178 } | |
2179 | |
2180 // A racing resume may have cancelled us before we grabbed SR_lock | |
2181 // above. Or another external suspend request could be waiting for us | |
2182 // by the time we return from SR_lock()->wait(). The thread | |
2183 // that requested the suspension may already be trying to walk our | |
2184 // stack and if we return now, we can change the stack out from under | |
2185 // it. This would be a "bad thing (TM)" and cause the stack walker | |
2186 // to crash. We stay self-suspended until there are no more pending | |
2187 // external suspend requests. | |
2188 while (is_external_suspend()) { | |
2189 ret++; | |
2190 this->set_ext_suspended(); | |
2191 | |
2192 // _ext_suspended flag is cleared by java_resume() | |
2193 while (is_ext_suspended()) { | |
2194 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
2195 } | |
2196 } | |
2197 | |
2198 return ret; | |
2199 } | |
2200 | |
2201 #ifdef ASSERT | |
2202 // verify the JavaThread has not yet been published in the Threads::list, and | |
2203 // hence doesn't need protection from concurrent access at this stage | |
2204 void JavaThread::verify_not_published() { | |
2205 if (!Threads_lock->owned_by_self()) { | |
2206 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
2207 assert( !Threads::includes(this), | |
2208 "java thread shouldn't have been published yet!"); | |
2209 } | |
2210 else { | |
2211 assert( !Threads::includes(this), | |
2212 "java thread shouldn't have been published yet!"); | |
2213 } | |
2214 } | |
2215 #endif | |
2216 | |
2217 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2218 // progress or when _suspend_flags is non-zero. | |
2219 // Current thread needs to self-suspend if there is a suspend request and/or | |
2220 // block if a safepoint is in progress. | |
2221 // Async exception ISN'T checked. | |
2222 // Note only the ThreadInVMfromNative transition can call this function | |
2223 // directly and when thread state is _thread_in_native_trans | |
2224 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
2225 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
2226 | |
2227 JavaThread *curJT = JavaThread::current(); | |
2228 bool do_self_suspend = thread->is_external_suspend(); | |
2229 | |
2230 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
2231 | |
2232 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2233 // thread is not the current thread. In older versions of jdbx, jdbx | |
2234 // threads could call into the VM with another thread's JNIEnv so we | |
2235 // can be here operating on behalf of a suspended thread (4432884). | |
2236 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2237 JavaThreadState state = thread->thread_state(); | |
2238 | |
2239 // We mark this thread_blocked state as a suspend-equivalent so | |
2240 // that a caller to is_ext_suspend_completed() won't be confused. | |
2241 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2242 thread->set_suspend_equivalent(); | |
2243 | |
2244 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2245 // wait until the thread changes to other thread state. There is no | |
2246 // guarantee on how soon we can obtain the SR_lock and complete the | |
2247 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2248 // too long. Temporarily change the state to _thread_blocked to | |
2249 // let the VM thread know that this thread is ready for GC. The problem | |
2250 // of changing thread state is that safepoint could happen just after | |
2251 // java_suspend_self() returns after being resumed, and VM thread will | |
2252 // see the _thread_blocked state. We must check for safepoint | |
2253 // after restoring the state and make sure we won't leave while a safepoint | |
2254 // is in progress. | |
2255 thread->set_thread_state(_thread_blocked); | |
2256 thread->java_suspend_self(); | |
2257 thread->set_thread_state(state); | |
2258 // Make sure new state is seen by VM thread | |
2259 if (os::is_MP()) { | |
2260 if (UseMembar) { | |
2261 // Force a fence between the write above and read below | |
2262 OrderAccess::fence(); | |
2263 } else { | |
2264 // Must use this rather than serialization page in particular on Windows | |
2265 InterfaceSupport::serialize_memory(thread); | |
2266 } | |
2267 } | |
2268 } | |
2269 | |
2270 if (SafepointSynchronize::do_call_back()) { | |
2271 // If we are safepointing, then block the caller which may not be | |
2272 // the same as the target thread (see above). | |
2273 SafepointSynchronize::block(curJT); | |
2274 } | |
2275 | |
2276 if (thread->is_deopt_suspend()) { | |
2277 thread->clear_deopt_suspend(); | |
2278 RegisterMap map(thread, false); | |
2279 frame f = thread->last_frame(); | |
2280 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2281 f = f.sender(&map); | |
2282 } | |
2283 if (f.id() == thread->must_deopt_id()) { | |
2284 thread->clear_must_deopt_id(); | |
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2285 f.deoptimize(thread); |
0 | 2286 } else { |
2287 fatal("missed deoptimization!"); | |
2288 } | |
2289 } | |
2290 } | |
2291 | |
2292 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2293 // progress or when _suspend_flags is non-zero. | |
2294 // Current thread needs to self-suspend if there is a suspend request and/or | |
2295 // block if a safepoint is in progress. | |
2296 // Also check for pending async exception (not including unsafe access error). | |
2297 // Note only the native==>VM/Java barriers can call this function and when | |
2298 // thread state is _thread_in_native_trans. | |
2299 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2300 check_safepoint_and_suspend_for_native_trans(thread); | |
2301 | |
2302 if (thread->has_async_exception()) { | |
2303 // We are in _thread_in_native_trans state, don't handle unsafe | |
2304 // access error since that may block. | |
2305 thread->check_and_handle_async_exceptions(false); | |
2306 } | |
2307 } | |
2308 | |
4873
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2309 // This is a variant of the normal |
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2310 // check_special_condition_for_native_trans with slightly different |
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2311 // semantics for use by critical native wrappers. It does all the |
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2312 // normal checks but also performs the transition back into |
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2313 // thread_in_Java state. This is required so that critical natives |
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2314 // can potentially block and perform a GC if they are the last thread |
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2315 // exiting the GC_locker. |
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2316 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
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2317 check_special_condition_for_native_trans(thread); |
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2318 |
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2319 // Finish the transition |
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2320 thread->set_thread_state(_thread_in_Java); |
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2321 |
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2322 if (thread->do_critical_native_unlock()) { |
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2323 ThreadInVMfromJavaNoAsyncException tiv(thread); |
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2324 GC_locker::unlock_critical(thread); |
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2325 thread->clear_critical_native_unlock(); |
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2326 } |
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2327 } |
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2328 |
0 | 2329 // We need to guarantee the Threads_lock here, since resumes are not |
2330 // allowed during safepoint synchronization | |
2331 // Can only resume from an external suspension | |
2332 void JavaThread::java_resume() { | |
2333 assert_locked_or_safepoint(Threads_lock); | |
2334 | |
2335 // Sanity check: thread is gone, has started exiting or the thread | |
2336 // was not externally suspended. | |
2337 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2338 return; | |
2339 } | |
2340 | |
2341 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2342 | |
2343 clear_external_suspend(); | |
2344 | |
2345 if (is_ext_suspended()) { | |
2346 clear_ext_suspended(); | |
2347 SR_lock()->notify_all(); | |
2348 } | |
2349 } | |
2350 | |
2351 void JavaThread::create_stack_guard_pages() { | |
2352 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2353 address low_addr = stack_base() - stack_size(); | |
2354 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2355 | |
2356 int allocate = os::allocate_stack_guard_pages(); | |
2357 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2358 | |
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2359 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
0 | 2360 warning("Attempt to allocate stack guard pages failed."); |
2361 return; | |
2362 } | |
2363 | |
2364 if (os::guard_memory((char *) low_addr, len)) { | |
2365 _stack_guard_state = stack_guard_enabled; | |
2366 } else { | |
2367 warning("Attempt to protect stack guard pages failed."); | |
2368 if (os::uncommit_memory((char *) low_addr, len)) { | |
2369 warning("Attempt to deallocate stack guard pages failed."); | |
2370 } | |
2371 } | |
2372 } | |
2373 | |
2374 void JavaThread::remove_stack_guard_pages() { | |
2375 if (_stack_guard_state == stack_guard_unused) return; | |
2376 address low_addr = stack_base() - stack_size(); | |
2377 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2378 | |
2379 if (os::allocate_stack_guard_pages()) { | |
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2380 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
0 | 2381 _stack_guard_state = stack_guard_unused; |
2382 } else { | |
2383 warning("Attempt to deallocate stack guard pages failed."); | |
2384 } | |
2385 } else { | |
2386 if (_stack_guard_state == stack_guard_unused) return; | |
2387 if (os::unguard_memory((char *) low_addr, len)) { | |
2388 _stack_guard_state = stack_guard_unused; | |
2389 } else { | |
2390 warning("Attempt to unprotect stack guard pages failed."); | |
2391 } | |
2392 } | |
2393 } | |
2394 | |
2395 void JavaThread::enable_stack_yellow_zone() { | |
2396 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2397 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2398 | |
2399 // The base notation is from the stacks point of view, growing downward. | |
2400 // We need to adjust it to work correctly with guard_memory() | |
2401 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2402 | |
2403 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2404 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2405 | |
2406 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2407 _stack_guard_state = stack_guard_enabled; | |
2408 } else { | |
2409 warning("Attempt to guard stack yellow zone failed."); | |
2410 } | |
2411 enable_register_stack_guard(); | |
2412 } | |
2413 | |
2414 void JavaThread::disable_stack_yellow_zone() { | |
2415 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2416 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2417 | |
2418 // Simply return if called for a thread that does not use guard pages. | |
2419 if (_stack_guard_state == stack_guard_unused) return; | |
2420 | |
2421 // The base notation is from the stacks point of view, growing downward. | |
2422 // We need to adjust it to work correctly with guard_memory() | |
2423 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2424 | |
2425 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2426 _stack_guard_state = stack_guard_yellow_disabled; | |
2427 } else { | |
2428 warning("Attempt to unguard stack yellow zone failed."); | |
2429 } | |
2430 disable_register_stack_guard(); | |
2431 } | |
2432 | |
2433 void JavaThread::enable_stack_red_zone() { | |
2434 // The base notation is from the stacks point of view, growing downward. | |
2435 // We need to adjust it to work correctly with guard_memory() | |
2436 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2437 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2438 | |
2439 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2440 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2441 | |
2442 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2443 warning("Attempt to guard stack red zone failed."); | |
2444 } | |
2445 } | |
2446 | |
2447 void JavaThread::disable_stack_red_zone() { | |
2448 // The base notation is from the stacks point of view, growing downward. | |
2449 // We need to adjust it to work correctly with guard_memory() | |
2450 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2451 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2452 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2453 warning("Attempt to unguard stack red zone failed."); | |
2454 } | |
2455 } | |
2456 | |
2457 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2458 // ignore is there is no stack | |
2459 if (!has_last_Java_frame()) return; | |
2460 // traverse the stack frames. Starts from top frame. | |
2461 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2462 frame* fr = fst.current(); | |
2463 f(fr, fst.register_map()); | |
2464 } | |
2465 } | |
2466 | |
2467 | |
2468 #ifndef PRODUCT | |
2469 // Deoptimization | |
2470 // Function for testing deoptimization | |
2471 void JavaThread::deoptimize() { | |
2472 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2473 StackFrameStream fst(this, UseBiasedLocking); | |
2474 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2475 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2476 // Iterate over all frames in the thread and deoptimize | |
2477 for(; !fst.is_done(); fst.next()) { | |
2478 if(fst.current()->can_be_deoptimized()) { | |
2479 | |
2480 if (only_at) { | |
2481 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2482 // consists of comma or carriage return separated numbers so | |
2483 // search for the current bci in that string. | |
2484 address pc = fst.current()->pc(); | |
2485 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2486 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2487 char buffer[8]; | |
2488 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2489 size_t len = strlen(buffer); | |
2490 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2491 while (found != NULL) { | |
2492 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2493 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2494 // Check that the bci found is bracketed by terminators. | |
2495 break; | |
2496 } | |
2497 found = strstr(found + 1, buffer); | |
2498 } | |
2499 if (!found) { | |
2500 continue; | |
2501 } | |
2502 } | |
2503 | |
2504 if (DebugDeoptimization && !deopt) { | |
2505 deopt = true; // One-time only print before deopt | |
2506 tty->print_cr("[BEFORE Deoptimization]"); | |
2507 trace_frames(); | |
2508 trace_stack(); | |
2509 } | |
2510 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2511 } | |
2512 } | |
2513 | |
2514 if (DebugDeoptimization && deopt) { | |
2515 tty->print_cr("[AFTER Deoptimization]"); | |
2516 trace_frames(); | |
2517 } | |
2518 } | |
2519 | |
2520 | |
2521 // Make zombies | |
2522 void JavaThread::make_zombies() { | |
2523 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2524 if (fst.current()->can_be_deoptimized()) { | |
2525 // it is a Java nmethod | |
2526 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2527 nm->make_not_entrant(); | |
2528 } | |
2529 } | |
2530 } | |
2531 #endif // PRODUCT | |
2532 | |
2533 | |
2534 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2535 if (!has_last_Java_frame()) return; | |
2536 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2537 StackFrameStream fst(this, UseBiasedLocking); | |
2538 for(; !fst.is_done(); fst.next()) { | |
2539 if (fst.current()->should_be_deoptimized()) { | |
2540 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2541 } | |
2542 } | |
2543 } | |
2544 | |
2545 | |
2546 // GC support | |
2547 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2548 | |
2549 void JavaThread::gc_epilogue() { | |
2550 frames_do(frame_gc_epilogue); | |
2551 } | |
2552 | |
2553 | |
2554 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2555 | |
2556 void JavaThread::gc_prologue() { | |
2557 frames_do(frame_gc_prologue); | |
2558 } | |
2559 | |
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2560 // If the caller is a NamedThread, then remember, in the current scope, |
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2561 // the given JavaThread in its _processed_thread field. |
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2562 class RememberProcessedThread: public StackObj { |
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2563 NamedThread* _cur_thr; |
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2564 public: |
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2565 RememberProcessedThread(JavaThread* jthr) { |
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2566 Thread* thread = Thread::current(); |
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2567 if (thread->is_Named_thread()) { |
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2568 _cur_thr = (NamedThread *)thread; |
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2569 _cur_thr->set_processed_thread(jthr); |
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2570 } else { |
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2571 _cur_thr = NULL; |
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2572 } |
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2573 } |
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2574 |
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2575 ~RememberProcessedThread() { |
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2576 if (_cur_thr) { |
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2577 _cur_thr->set_processed_thread(NULL); |
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2578 } |
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2579 } |
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2580 }; |
0 | 2581 |
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2582 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
1166 | 2583 // Verify that the deferred card marks have been flushed. |
2584 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
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2585 |
0 | 2586 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
2587 // since there may be more than one thread using each ThreadProfiler. | |
2588 | |
2589 // Traverse the GCHandles | |
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2590 Thread::oops_do(f, cf); |
0 | 2591 |
2592 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2593 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2594 | |
2595 if (has_last_Java_frame()) { | |
1119
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2596 // Record JavaThread to GC thread |
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2597 RememberProcessedThread rpt(this); |
0 | 2598 |
2599 // Traverse the privileged stack | |
2600 if (_privileged_stack_top != NULL) { | |
2601 _privileged_stack_top->oops_do(f); | |
2602 } | |
2603 | |
2604 // traverse the registered growable array | |
2605 if (_array_for_gc != NULL) { | |
2606 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2607 f->do_oop(_array_for_gc->adr_at(index)); | |
2608 } | |
2609 } | |
2610 | |
2611 // Traverse the monitor chunks | |
2612 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2613 chunk->oops_do(f); | |
2614 } | |
2615 | |
2616 // Traverse the execution stack | |
2617 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2618 fst.current()->oops_do(f, cf, fst.register_map()); |
0 | 2619 } |
2620 } | |
2621 | |
2622 // callee_target is never live across a gc point so NULL it here should | |
2623 // it still contain a methdOop. | |
2624 | |
2625 set_callee_target(NULL); | |
2626 | |
2627 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2628 // If we have deferred set_locals there might be oops waiting to be | |
2629 // written | |
2630 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2631 if (list != NULL) { | |
2632 for (int i = 0; i < list->length(); i++) { | |
2633 list->at(i)->oops_do(f); | |
2634 } | |
2635 } | |
2636 | |
2637 // Traverse instance variables at the end since the GC may be moving things | |
2638 // around using this function | |
2639 f->do_oop((oop*) &_threadObj); | |
2640 f->do_oop((oop*) &_vm_result); | |
2641 f->do_oop((oop*) &_vm_result_2); | |
2642 f->do_oop((oop*) &_exception_oop); | |
2643 f->do_oop((oop*) &_pending_async_exception); | |
2644 | |
2645 if (jvmti_thread_state() != NULL) { | |
2646 jvmti_thread_state()->oops_do(f); | |
2647 } | |
2648 } | |
2649 | |
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2650 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
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2651 Thread::nmethods_do(cf); // (super method is a no-op) |
0 | 2652 |
2653 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2654 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2655 | |
2656 if (has_last_Java_frame()) { | |
2657 // Traverse the execution stack | |
2658 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2659 fst.current()->nmethods_do(cf); |
0 | 2660 } |
2661 } | |
2662 } | |
2663 | |
2664 // Printing | |
2665 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2666 switch (_thread_state) { | |
2667 case _thread_uninitialized: return "_thread_uninitialized"; | |
2668 case _thread_new: return "_thread_new"; | |
2669 case _thread_new_trans: return "_thread_new_trans"; | |
2670 case _thread_in_native: return "_thread_in_native"; | |
2671 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2672 case _thread_in_vm: return "_thread_in_vm"; | |
2673 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2674 case _thread_in_Java: return "_thread_in_Java"; | |
2675 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2676 case _thread_blocked: return "_thread_blocked"; | |
2677 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2678 default: return "unknown thread state"; | |
2679 } | |
2680 } | |
2681 | |
2682 #ifndef PRODUCT | |
2683 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2684 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2685 }; | |
2686 void JavaThread::print_thread_state() const { | |
2687 print_thread_state_on(tty); | |
2688 }; | |
2689 #endif // PRODUCT | |
2690 | |
2691 // Called by Threads::print() for VM_PrintThreads operation | |
2692 void JavaThread::print_on(outputStream *st) const { | |
2693 st->print("\"%s\" ", get_thread_name()); | |
2694 oop thread_oop = threadObj(); | |
2695 if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2696 Thread::print_on(st); | |
2697 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
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2698 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
0 | 2699 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
2700 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2701 } | |
2702 #ifndef PRODUCT | |
2703 print_thread_state_on(st); | |
2704 _safepoint_state->print_on(st); | |
2705 #endif // PRODUCT | |
2706 } | |
2707 | |
2708 // Called by fatal error handler. The difference between this and | |
2709 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2710 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2711 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2712 oop thread_obj = threadObj(); | |
2713 if (thread_obj != NULL) { | |
2714 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2715 } | |
2716 st->print(" ["); | |
2717 st->print("%s", _get_thread_state_name(_thread_state)); | |
2718 if (osthread()) { | |
2719 st->print(", id=%d", osthread()->thread_id()); | |
2720 } | |
2721 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2722 _stack_base - _stack_size, _stack_base); | |
2723 st->print("]"); | |
2724 return; | |
2725 } | |
2726 | |
2727 // Verification | |
2728 | |
2729 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2730 | |
2731 void JavaThread::verify() { | |
2732 // Verify oops in the thread. | |
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2733 oops_do(&VerifyOopClosure::verify_oop, NULL); |
0 | 2734 |
2735 // Verify the stack frames. | |
2736 frames_do(frame_verify); | |
2737 } | |
2738 | |
2739 // CR 6300358 (sub-CR 2137150) | |
2740 // Most callers of this method assume that it can't return NULL but a | |
2741 // thread may not have a name whilst it is in the process of attaching to | |
2742 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2743 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2744 // if vm exit occurs during initialization). These cases can all be accounted | |
2745 // for such that this method never returns NULL. | |
2746 const char* JavaThread::get_thread_name() const { | |
2747 #ifdef ASSERT | |
2748 // early safepoints can hit while current thread does not yet have TLS | |
2749 if (!SafepointSynchronize::is_at_safepoint()) { | |
2750 Thread *cur = Thread::current(); | |
2751 if (!(cur->is_Java_thread() && cur == this)) { | |
2752 // Current JavaThreads are allowed to get their own name without | |
2753 // the Threads_lock. | |
2754 assert_locked_or_safepoint(Threads_lock); | |
2755 } | |
2756 } | |
2757 #endif // ASSERT | |
2758 return get_thread_name_string(); | |
2759 } | |
2760 | |
2761 // Returns a non-NULL representation of this thread's name, or a suitable | |
2762 // descriptive string if there is no set name | |
2763 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2764 const char* name_str; | |
2765 oop thread_obj = threadObj(); | |
2766 if (thread_obj != NULL) { | |
2767 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2768 if (name != NULL) { | |
2769 if (buf == NULL) { | |
2770 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2771 } | |
2772 else { | |
2773 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2774 } | |
2775 } | |
4006 | 2776 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
0 | 2777 name_str = "<no-name - thread is attaching>"; |
2778 } | |
2779 else { | |
2780 name_str = Thread::name(); | |
2781 } | |
2782 } | |
2783 else { | |
2784 name_str = Thread::name(); | |
2785 } | |
2786 assert(name_str != NULL, "unexpected NULL thread name"); | |
2787 return name_str; | |
2788 } | |
2789 | |
2790 | |
2791 const char* JavaThread::get_threadgroup_name() const { | |
2792 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2793 oop thread_obj = threadObj(); | |
2794 if (thread_obj != NULL) { | |
2795 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2796 if (thread_group != NULL) { | |
2797 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
2798 // ThreadGroup.name can be null | |
2799 if (name != NULL) { | |
2800 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2801 return str; | |
2802 } | |
2803 } | |
2804 } | |
2805 return NULL; | |
2806 } | |
2807 | |
2808 const char* JavaThread::get_parent_name() const { | |
2809 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2810 oop thread_obj = threadObj(); | |
2811 if (thread_obj != NULL) { | |
2812 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2813 if (thread_group != NULL) { | |
2814 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
2815 if (parent != NULL) { | |
2816 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
2817 // ThreadGroup.name can be null | |
2818 if (name != NULL) { | |
2819 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2820 return str; | |
2821 } | |
2822 } | |
2823 } | |
2824 } | |
2825 return NULL; | |
2826 } | |
2827 | |
2828 ThreadPriority JavaThread::java_priority() const { | |
2829 oop thr_oop = threadObj(); | |
2830 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
2831 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
2832 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
2833 return priority; | |
2834 } | |
2835 | |
2836 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
2837 | |
2838 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
2839 // Link Java Thread object <-> C++ Thread | |
2840 | |
2841 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
2842 // and put it into a new Handle. The Handle "thread_oop" can then | |
2843 // be used to pass the C++ thread object to other methods. | |
2844 | |
2845 // Set the Java level thread object (jthread) field of the | |
2846 // new thread (a JavaThread *) to C++ thread object using the | |
2847 // "thread_oop" handle. | |
2848 | |
2849 // Set the thread field (a JavaThread *) of the | |
2850 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
2851 | |
2852 Handle thread_oop(Thread::current(), | |
2853 JNIHandles::resolve_non_null(jni_thread)); | |
2854 assert(instanceKlass::cast(thread_oop->klass())->is_linked(), | |
2855 "must be initialized"); | |
2856 set_threadObj(thread_oop()); | |
2857 java_lang_Thread::set_thread(thread_oop(), this); | |
2858 | |
2859 if (prio == NoPriority) { | |
2860 prio = java_lang_Thread::priority(thread_oop()); | |
2861 assert(prio != NoPriority, "A valid priority should be present"); | |
2862 } | |
2863 | |
2864 // Push the Java priority down to the native thread; needs Threads_lock | |
2865 Thread::set_priority(this, prio); | |
2866 | |
2867 // Add the new thread to the Threads list and set it in motion. | |
2868 // We must have threads lock in order to call Threads::add. | |
2869 // It is crucial that we do not block before the thread is | |
2870 // added to the Threads list for if a GC happens, then the java_thread oop | |
2871 // will not be visited by GC. | |
2872 Threads::add(this); | |
2873 } | |
2874 | |
2875 oop JavaThread::current_park_blocker() { | |
2876 // Support for JSR-166 locks | |
2877 oop thread_oop = threadObj(); | |
242 | 2878 if (thread_oop != NULL && |
2879 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 2880 return java_lang_Thread::park_blocker(thread_oop); |
2881 } | |
2882 return NULL; | |
2883 } | |
2884 | |
2885 | |
2886 void JavaThread::print_stack_on(outputStream* st) { | |
2887 if (!has_last_Java_frame()) return; | |
2888 ResourceMark rm; | |
2889 HandleMark hm; | |
2890 | |
2891 RegisterMap reg_map(this); | |
2892 vframe* start_vf = last_java_vframe(®_map); | |
2893 int count = 0; | |
2894 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2895 if (f->is_java_frame()) { | |
2896 javaVFrame* jvf = javaVFrame::cast(f); | |
2897 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
2898 | |
2899 // Print out lock information | |
2900 if (JavaMonitorsInStackTrace) { | |
2901 jvf->print_lock_info_on(st, count); | |
2902 } | |
2903 } else { | |
2904 // Ignore non-Java frames | |
2905 } | |
2906 | |
2907 // Bail-out case for too deep stacks | |
2908 count++; | |
2909 if (MaxJavaStackTraceDepth == count) return; | |
2910 } | |
2911 } | |
2912 | |
2913 | |
2914 // JVMTI PopFrame support | |
2915 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
2916 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
2917 if (in_bytes(size_in_bytes) != 0) { | |
2918 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes)); | |
2919 _popframe_preserved_args_size = in_bytes(size_in_bytes); | |
1603
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6730276: JDI_REGRESSION tests fail with "Error: count must be non-zero" error on x86
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|
2920 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
0 | 2921 } |
2922 } | |
2923 | |
2924 void* JavaThread::popframe_preserved_args() { | |
2925 return _popframe_preserved_args; | |
2926 } | |
2927 | |
2928 ByteSize JavaThread::popframe_preserved_args_size() { | |
2929 return in_ByteSize(_popframe_preserved_args_size); | |
2930 } | |
2931 | |
2932 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
2933 int sz = in_bytes(popframe_preserved_args_size()); | |
2934 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
2935 return in_WordSize(sz / wordSize); | |
2936 } | |
2937 | |
2938 void JavaThread::popframe_free_preserved_args() { | |
2939 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
2940 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args); | |
2941 _popframe_preserved_args = NULL; | |
2942 _popframe_preserved_args_size = 0; | |
2943 } | |
2944 | |
2945 #ifndef PRODUCT | |
2946 | |
2947 void JavaThread::trace_frames() { | |
2948 tty->print_cr("[Describe stack]"); | |
2949 int frame_no = 1; | |
2950 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2951 tty->print(" %d. ", frame_no++); | |
2952 fst.current()->print_value_on(tty,this); | |
2953 tty->cr(); | |
2954 } | |
2955 } | |
2956 | |
3908
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2957 class PrintAndVerifyOopClosure: public OopClosure { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2958 protected: |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2959 template <class T> inline void do_oop_work(T* p) { |
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2960 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
2961 if (obj == NULL) return; |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2962 tty->print(INTPTR_FORMAT ": ", p); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2963 if (obj->is_oop_or_null()) { |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2964 if (obj->is_objArray()) { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2965 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2966 } else { |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2967 obj->print(); |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2968 } |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2969 } else { |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2970 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2971 } |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2972 tty->cr(); |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2973 } |
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|
2974 public: |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2975 virtual void do_oop(oop* p) { do_oop_work(p); } |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2976 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2977 }; |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2978 |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2979 |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2980 static void oops_print(frame* f, const RegisterMap *map) { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2981 PrintAndVerifyOopClosure print; |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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3899
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|
2982 f->print_value(); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2983 f->oops_do(&print, NULL, (RegisterMap*)map); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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changeset
|
2984 } |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2985 |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2986 // Print our all the locations that contain oops and whether they are |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2987 // valid or not. This useful when trying to find the oldest frame |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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3899
diff
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|
2988 // where an oop has gone bad since the frame walk is from youngest to |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
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changeset
|
2989 // oldest. |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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3899
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|
2990 void JavaThread::trace_oops() { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
3899
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changeset
|
2991 tty->print_cr("[Trace oops]"); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
3899
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|
2992 frames_do(oops_print); |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
3899
diff
changeset
|
2993 } |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2994 |
0 | 2995 |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
2996 #ifdef ASSERT |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
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|
2997 // Print or validate the layout of stack frames |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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diff
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|
2998 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2999 ResourceMark rm; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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diff
changeset
|
3000 PRESERVE_EXCEPTION_MARK; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3001 FrameValues values; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3002 int frame_no = 0; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
2416
diff
changeset
|
3003 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
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changeset
|
3004 fst.current()->describe(values, ++frame_no); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3005 if (depth == frame_no) break; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3006 } |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
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diff
changeset
|
3007 if (validate_only) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3008 values.validate(); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
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changeset
|
3009 } else { |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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changeset
|
3010 tty->print_cr("[Describe stack layout]"); |
4042
b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
4007
diff
changeset
|
3011 values.print(this); |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
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diff
changeset
|
3012 } |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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2416
diff
changeset
|
3013 } |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
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diff
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|
3014 #endif |
3336
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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|
3015 |
0 | 3016 void JavaThread::trace_stack_from(vframe* start_vf) { |
3017 ResourceMark rm; | |
3018 int vframe_no = 1; | |
3019 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3020 if (f->is_java_frame()) { | |
3021 javaVFrame::cast(f)->print_activation(vframe_no++); | |
3022 } else { | |
3023 f->print(); | |
3024 } | |
3025 if (vframe_no > StackPrintLimit) { | |
3026 tty->print_cr("...<more frames>..."); | |
3027 return; | |
3028 } | |
3029 } | |
3030 } | |
3031 | |
3032 | |
3033 void JavaThread::trace_stack() { | |
3034 if (!has_last_Java_frame()) return; | |
3035 ResourceMark rm; | |
3036 HandleMark hm; | |
3037 RegisterMap reg_map(this); | |
3038 trace_stack_from(last_java_vframe(®_map)); | |
3039 } | |
3040 | |
3041 | |
3042 #endif // PRODUCT | |
3043 | |
3044 | |
3045 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
3046 assert(reg_map != NULL, "a map must be given"); | |
3047 frame f = last_frame(); | |
3048 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
3049 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
3050 } | |
3051 return NULL; | |
3052 } | |
3053 | |
3054 | |
3055 klassOop JavaThread::security_get_caller_class(int depth) { | |
3056 vframeStream vfst(this); | |
3057 vfst.security_get_caller_frame(depth); | |
3058 if (!vfst.at_end()) { | |
3059 return vfst.method()->method_holder(); | |
3060 } | |
3061 return NULL; | |
3062 } | |
3063 | |
3064 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
3065 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
3066 CompileBroker::compiler_thread_loop(); | |
3067 } | |
3068 | |
3069 // Create a CompilerThread | |
3070 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
3071 : JavaThread(&compiler_thread_entry) { | |
3072 _env = NULL; | |
3073 _log = NULL; | |
3074 _task = NULL; | |
3075 _queue = queue; | |
3076 _counters = counters; | |
1584 | 3077 _buffer_blob = NULL; |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
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3336
diff
changeset
|
3078 _scanned_nmethod = NULL; |
0 | 3079 |
3080 #ifndef PRODUCT | |
3081 _ideal_graph_printer = NULL; | |
3082 #endif | |
3083 } | |
3084 | |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
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3336
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|
3085 void CompilerThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
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changeset
|
3086 JavaThread::oops_do(f, cf); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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diff
changeset
|
3087 if (_scanned_nmethod != NULL && cf != NULL) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
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changeset
|
3088 // Safepoints can occur when the sweeper is scanning an nmethod so |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
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changeset
|
3089 // process it here to make sure it isn't unloaded in the middle of |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3090 // a scan. |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3091 cf->do_code_blob(_scanned_nmethod); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
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diff
changeset
|
3092 } |
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|
3093 } |
0 | 3094 |
3095 // ======= Threads ======== | |
3096 | |
3097 // The Threads class links together all active threads, and provides | |
3098 // operations over all threads. It is protected by its own Mutex | |
3099 // lock, which is also used in other contexts to protect thread | |
3100 // operations from having the thread being operated on from exiting | |
3101 // and going away unexpectedly (e.g., safepoint synchronization) | |
3102 | |
3103 JavaThread* Threads::_thread_list = NULL; | |
3104 int Threads::_number_of_threads = 0; | |
3105 int Threads::_number_of_non_daemon_threads = 0; | |
3106 int Threads::_return_code = 0; | |
3107 size_t JavaThread::_stack_size_at_create = 0; | |
3108 | |
3109 // All JavaThreads | |
3110 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
3111 | |
3112 void os_stream(); | |
3113 | |
3114 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
3115 void Threads::threads_do(ThreadClosure* tc) { | |
3116 assert_locked_or_safepoint(Threads_lock); | |
3117 // ALL_JAVA_THREADS iterates through all JavaThreads | |
3118 ALL_JAVA_THREADS(p) { | |
3119 tc->do_thread(p); | |
3120 } | |
3121 // Someday we could have a table or list of all non-JavaThreads. | |
3122 // For now, just manually iterate through them. | |
3123 tc->do_thread(VMThread::vm_thread()); | |
3124 Universe::heap()->gc_threads_do(tc); | |
323
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3125 WatcherThread *wt = WatcherThread::watcher_thread(); |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3126 // Strictly speaking, the following NULL check isn't sufficient to make sure |
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3127 // the data for WatcherThread is still valid upon being examined. However, |
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3128 // considering that WatchThread terminates when the VM is on the way to |
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3129 // exit at safepoint, the chance of the above is extremely small. The right |
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3130 // way to prevent termination of WatcherThread would be to acquire |
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3131 // Terminator_lock, but we can't do that without violating the lock rank |
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3132 // checking in some cases. |
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3133 if (wt != NULL) |
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3134 tc->do_thread(wt); |
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3135 |
0 | 3136 // If CompilerThreads ever become non-JavaThreads, add them here |
3137 } | |
3138 | |
3139 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
3140 | |
242 | 3141 extern void JDK_Version_init(); |
3142 | |
0 | 3143 // Check version |
3144 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
3145 | |
3146 // Initialize the output stream module | |
3147 ostream_init(); | |
3148 | |
3149 // Process java launcher properties. | |
3150 Arguments::process_sun_java_launcher_properties(args); | |
3151 | |
3152 // Initialize the os module before using TLS | |
3153 os::init(); | |
3154 | |
3155 // Initialize system properties. | |
3156 Arguments::init_system_properties(); | |
3157 | |
242 | 3158 // So that JDK version can be used as a discrimintor when parsing arguments |
3159 JDK_Version_init(); | |
3160 | |
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3161 // Update/Initialize System properties after JDK version number is known |
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3162 Arguments::init_version_specific_system_properties(); |
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3163 |
0 | 3164 // Parse arguments |
3165 jint parse_result = Arguments::parse(args); | |
3166 if (parse_result != JNI_OK) return parse_result; | |
3167 | |
3168 if (PauseAtStartup) { | |
3169 os::pause(); | |
3170 } | |
3171 | |
4006 | 3172 #ifndef USDT2 |
0 | 3173 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
4006 | 3174 #else /* USDT2 */ |
3175 HOTSPOT_VM_INIT_BEGIN(); | |
3176 #endif /* USDT2 */ | |
0 | 3177 |
3178 // Record VM creation timing statistics | |
3179 TraceVmCreationTime create_vm_timer; | |
3180 create_vm_timer.start(); | |
3181 | |
3182 // Timing (must come after argument parsing) | |
3183 TraceTime timer("Create VM", TraceStartupTime); | |
3184 | |
3185 // Initialize the os module after parsing the args | |
3186 jint os_init_2_result = os::init_2(); | |
3187 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
3188 | |
3189 // Initialize output stream logging | |
3190 ostream_init_log(); | |
3191 | |
3192 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
3193 // Must be before create_vm_init_agents() | |
3194 if (Arguments::init_libraries_at_startup()) { | |
3195 convert_vm_init_libraries_to_agents(); | |
3196 } | |
3197 | |
3198 // Launch -agentlib/-agentpath and converted -Xrun agents | |
3199 if (Arguments::init_agents_at_startup()) { | |
3200 create_vm_init_agents(); | |
3201 } | |
3202 | |
3203 // Initialize Threads state | |
3204 _thread_list = NULL; | |
3205 _number_of_threads = 0; | |
3206 _number_of_non_daemon_threads = 0; | |
3207 | |
3208 // Initialize TLS | |
3209 ThreadLocalStorage::init(); | |
3210 | |
3211 // Initialize global data structures and create system classes in heap | |
3212 vm_init_globals(); | |
3213 | |
3214 // Attach the main thread to this os thread | |
3215 JavaThread* main_thread = new JavaThread(); | |
3216 main_thread->set_thread_state(_thread_in_vm); | |
3217 // must do this before set_active_handles and initialize_thread_local_storage | |
3218 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
3219 // change the stack size recorded here to one based on the java thread | |
3220 // stacksize. This adjusted size is what is used to figure the placement | |
3221 // of the guard pages. | |
3222 main_thread->record_stack_base_and_size(); | |
3223 main_thread->initialize_thread_local_storage(); | |
3224 | |
3225 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
3226 | |
3227 if (!main_thread->set_as_starting_thread()) { | |
3228 vm_shutdown_during_initialization( | |
3229 "Failed necessary internal allocation. Out of swap space"); | |
3230 delete main_thread; | |
3231 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3232 return JNI_ENOMEM; | |
3233 } | |
3234 | |
3235 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
3236 // crash Linux VM, see notes in os_linux.cpp. | |
3237 main_thread->create_stack_guard_pages(); | |
3238 | |
1878 | 3239 // Initialize Java-Level synchronization subsystem |
3240 ObjectMonitor::Initialize() ; | |
0 | 3241 |
3242 // Initialize global modules | |
3243 jint status = init_globals(); | |
3244 if (status != JNI_OK) { | |
3245 delete main_thread; | |
3246 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3247 return status; | |
3248 } | |
3249 | |
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3250 // Should be done after the heap is fully created |
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3251 main_thread->cache_global_variables(); |
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3252 |
0 | 3253 HandleMark hm; |
3254 | |
3255 { MutexLocker mu(Threads_lock); | |
3256 Threads::add(main_thread); | |
3257 } | |
3258 | |
3259 // Any JVMTI raw monitors entered in onload will transition into | |
3260 // real raw monitor. VM is setup enough here for raw monitor enter. | |
3261 JvmtiExport::transition_pending_onload_raw_monitors(); | |
3262 | |
3263 if (VerifyBeforeGC && | |
3264 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
3265 Universe::heap()->prepare_for_verify(); | |
3266 Universe::verify(); // make sure we're starting with a clean slate | |
3267 } | |
3268 | |
3269 // Create the VMThread | |
3270 { TraceTime timer("Start VMThread", TraceStartupTime); | |
3271 VMThread::create(); | |
3272 Thread* vmthread = VMThread::vm_thread(); | |
3273 | |
3274 if (!os::create_thread(vmthread, os::vm_thread)) | |
3275 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
3276 | |
3277 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
3278 // Monitors can have spurious returns, must always check another state flag | |
3279 { | |
3280 MutexLocker ml(Notify_lock); | |
3281 os::start_thread(vmthread); | |
3282 while (vmthread->active_handles() == NULL) { | |
3283 Notify_lock->wait(); | |
3284 } | |
3285 } | |
3286 } | |
3287 | |
3288 assert (Universe::is_fully_initialized(), "not initialized"); | |
3289 EXCEPTION_MARK; | |
3290 | |
3291 // At this point, the Universe is initialized, but we have not executed | |
3292 // any byte code. Now is a good time (the only time) to dump out the | |
3293 // internal state of the JVM for sharing. | |
3294 | |
3295 if (DumpSharedSpaces) { | |
3296 Universe::heap()->preload_and_dump(CHECK_0); | |
3297 ShouldNotReachHere(); | |
3298 } | |
3299 | |
3300 // Always call even when there are not JVMTI environments yet, since environments | |
3301 // may be attached late and JVMTI must track phases of VM execution | |
3302 JvmtiExport::enter_start_phase(); | |
3303 | |
3304 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
3305 JvmtiExport::post_vm_start(); | |
3306 | |
3307 { | |
3308 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
3309 | |
3310 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3311 create_vm_init_libraries(); | |
3312 } | |
3313 | |
3314 if (InitializeJavaLangString) { | |
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3315 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
0 | 3316 } else { |
3317 warning("java.lang.String not initialized"); | |
3318 } | |
3319 | |
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3320 if (AggressiveOpts) { |
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3321 { |
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3322 // Forcibly initialize java/util/HashMap and mutate the private |
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3323 // static final "frontCacheEnabled" field before we start creating instances |
18
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3324 #ifdef ASSERT |
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3325 klassOop tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
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3326 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
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3327 #endif |
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3328 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
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3329 KlassHandle k = KlassHandle(THREAD, k_o); |
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3330 guarantee(k.not_null(), "Must find java/util/HashMap"); |
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3331 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
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3332 ik->initialize(CHECK_0); |
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3333 fieldDescriptor fd; |
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3334 // Possible we might not find this field; if so, don't break |
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3335 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
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3336 k()->java_mirror()->bool_field_put(fd.offset(), true); |
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3337 } |
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|
3338 } |
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3339 |
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|
3340 if (UseStringCache) { |
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3341 // Forcibly initialize java/lang/StringValue and mutate the private |
192
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3342 // static final "stringCacheEnabled" field before we start creating instances |
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3343 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
669
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3344 // Possible that StringValue isn't present: if so, silently don't break |
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|
3345 if (k_o != NULL) { |
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3346 KlassHandle k = KlassHandle(THREAD, k_o); |
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3347 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
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|
3348 ik->initialize(CHECK_0); |
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|
3349 fieldDescriptor fd; |
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3350 // Possible we might not find this field: if so, silently don't break |
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3351 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
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3352 k()->java_mirror()->bool_field_put(fd.offset(), true); |
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3353 } |
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3354 } |
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3355 } |
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3356 } |
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3357 |
0 | 3358 // Initialize java_lang.System (needed before creating the thread) |
3359 if (InitializeJavaLangSystem) { | |
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3360 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
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3361 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
0 | 3362 Handle thread_group = create_initial_thread_group(CHECK_0); |
3363 Universe::set_main_thread_group(thread_group()); | |
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3364 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
0 | 3365 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
3366 main_thread->set_threadObj(thread_object); | |
3367 // Set thread status to running since main thread has | |
3368 // been started and running. | |
3369 java_lang_Thread::set_thread_status(thread_object, | |
3370 java_lang_Thread::RUNNABLE); | |
3371 | |
3372 // The VM preresolve methods to these classes. Make sure that get initialized | |
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3373 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); |
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3374 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
0 | 3375 // The VM creates & returns objects of this class. Make sure it's initialized. |
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3376 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
0 | 3377 call_initializeSystemClass(CHECK_0); |
6181 | 3378 |
3379 // get the Java runtime name after java.lang.System is initialized | |
3380 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); | |
0 | 3381 } else { |
3382 warning("java.lang.System not initialized"); | |
3383 } | |
3384 | |
3385 // an instance of OutOfMemory exception has been allocated earlier | |
3386 if (InitializeJavaLangExceptionsErrors) { | |
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3387 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
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3388 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
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3389 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
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3390 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
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3391 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
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3392 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
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3393 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
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3394 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); |
0 | 3395 } else { |
3396 warning("java.lang.OutOfMemoryError has not been initialized"); | |
3397 warning("java.lang.NullPointerException has not been initialized"); | |
3398 warning("java.lang.ClassCastException has not been initialized"); | |
3399 warning("java.lang.ArrayStoreException has not been initialized"); | |
3400 warning("java.lang.ArithmeticException has not been initialized"); | |
3401 warning("java.lang.StackOverflowError has not been initialized"); | |
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3402 warning("java.lang.IllegalArgumentException has not been initialized"); |
0 | 3403 } |
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3404 } |
0 | 3405 |
3406 // See : bugid 4211085. | |
3407 // Background : the static initializer of java.lang.Compiler tries to read | |
3408 // property"java.compiler" and read & write property "java.vm.info". | |
3409 // When a security manager is installed through the command line | |
3410 // option "-Djava.security.manager", the above properties are not | |
3411 // readable and the static initializer for java.lang.Compiler fails | |
3412 // resulting in a NoClassDefFoundError. This can happen in any | |
3413 // user code which calls methods in java.lang.Compiler. | |
3414 // Hack : the hack is to pre-load and initialize this class, so that only | |
3415 // system domains are on the stack when the properties are read. | |
3416 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
3417 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
3418 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
3419 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
3420 // Once that is done, we should remove this hack. | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3421 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
0 | 3422 |
3423 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
3424 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
3425 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
3426 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
3427 // This should also be taken out as soon as 4211383 gets fixed. | |
3428 reset_vm_info_property(CHECK_0); | |
3429 | |
3430 quicken_jni_functions(); | |
3431 | |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3432 // Must be run after init_ft which initializes ft_enabled |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3433 if (TRACE_INITIALIZE() != JNI_OK) { |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3434 vm_exit_during_initialization("Failed to initialize tracing backend"); |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3435 } |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3436 |
0 | 3437 // Set flag that basic initialization has completed. Used by exceptions and various |
3438 // debug stuff, that does not work until all basic classes have been initialized. | |
3439 set_init_completed(); | |
3440 | |
4006 | 3441 #ifndef USDT2 |
0 | 3442 HS_DTRACE_PROBE(hotspot, vm__init__end); |
4006 | 3443 #else /* USDT2 */ |
3444 HOTSPOT_VM_INIT_END(); | |
3445 #endif /* USDT2 */ | |
0 | 3446 |
3447 // record VM initialization completion time | |
3448 Management::record_vm_init_completed(); | |
3449 | |
3450 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3451 // valid exceptions may be thrown in the process. | |
3452 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3453 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3454 // anymore. We call vm_exit_during_initialization directly instead. | |
3455 SystemDictionary::compute_java_system_loader(THREAD); | |
3456 if (HAS_PENDING_EXCEPTION) { | |
3457 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3458 } | |
3459 | |
3460 #ifndef SERIALGC | |
3461 // Support for ConcurrentMarkSweep. This should be cleaned up | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3462 // and better encapsulated. The ugly nested if test would go away |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3463 // once things are properly refactored. XXX YSR |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3464 if (UseConcMarkSweepGC || UseG1GC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3465 if (UseConcMarkSweepGC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3466 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3467 } else { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3468 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3469 } |
0 | 3470 if (HAS_PENDING_EXCEPTION) { |
3471 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3472 } | |
3473 } | |
3474 #endif // SERIALGC | |
3475 | |
3476 // Always call even when there are not JVMTI environments yet, since environments | |
3477 // may be attached late and JVMTI must track phases of VM execution | |
3478 JvmtiExport::enter_live_phase(); | |
3479 | |
3480 // Signal Dispatcher needs to be started before VMInit event is posted | |
3481 os::signal_init(); | |
3482 | |
3483 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3484 if (!DisableAttachMechanism) { | |
3485 if (StartAttachListener || AttachListener::init_at_startup()) { | |
3486 AttachListener::init(); | |
3487 } | |
3488 } | |
3489 | |
3490 // Launch -Xrun agents | |
3491 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3492 // back-end can launch with -Xdebug -Xrunjdwp. | |
3493 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3494 create_vm_init_libraries(); | |
3495 } | |
3496 | |
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3497 // Notify JVMTI agents that VM initialization is complete - nop if no agents. |
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3498 JvmtiExport::post_vm_initialized(); |
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3499 |
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3500 if (!TRACE_START()) { |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3501 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3502 } |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3503 |
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3504 if (CleanChunkPoolAsync) { |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3505 Chunk::start_chunk_pool_cleaner_task(); |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3506 } |
0 | 3507 |
3508 // initialize compiler(s) | |
3509 CompileBroker::compilation_init(); | |
3510 | |
3511 Management::initialize(THREAD); | |
3512 if (HAS_PENDING_EXCEPTION) { | |
3513 // management agent fails to start possibly due to | |
3514 // configuration problem and is responsible for printing | |
3515 // stack trace if appropriate. Simply exit VM. | |
3516 vm_exit(1); | |
3517 } | |
3518 | |
3519 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3520 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
3521 if (MemProfiling) MemProfiler::engage(); | |
3522 StatSampler::engage(); | |
3523 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3524 | |
3525 BiasedLocking::init(); | |
3526 | |
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3527 if (JDK_Version::current().post_vm_init_hook_enabled()) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3528 call_postVMInitHook(THREAD); |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3529 // The Java side of PostVMInitHook.run must deal with all |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3530 // exceptions and provide means of diagnosis. |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3531 if (HAS_PENDING_EXCEPTION) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3532 CLEAR_PENDING_EXCEPTION; |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3533 } |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3534 } |
0 | 3535 |
3536 // Start up the WatcherThread if there are any periodic tasks | |
3537 // NOTE: All PeriodicTasks should be registered by now. If they | |
3538 // aren't, late joiners might appear to start slowly (we might | |
3539 // take a while to process their first tick). | |
3540 if (PeriodicTask::num_tasks() > 0) { | |
3541 WatcherThread::start(); | |
3542 } | |
3543 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3544 // Give os specific code one last chance to start |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3545 os::init_3(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3546 |
0 | 3547 create_vm_timer.end(); |
3548 return JNI_OK; | |
3549 } | |
3550 | |
3551 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3552 extern "C" { | |
3553 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3554 } | |
3555 // Find a command line agent library and return its entry point for | |
3556 // -agentlib: -agentpath: -Xrun | |
3557 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3558 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3559 OnLoadEntry_t on_load_entry = NULL; | |
3560 void *library = agent->os_lib(); // check if we have looked it up before | |
3561 | |
3562 if (library == NULL) { | |
3563 char buffer[JVM_MAXPATHLEN]; | |
3564 char ebuf[1024]; | |
3565 const char *name = agent->name(); | |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3566 const char *msg = "Could not find agent library "; |
0 | 3567 |
3568 if (agent->is_absolute_path()) { | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3569 library = os::dll_load(name, ebuf, sizeof ebuf); |
0 | 3570 if (library == NULL) { |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3571 const char *sub_msg = " in absolute path, with error: "; |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3572 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3573 char *buf = NEW_C_HEAP_ARRAY(char, len); |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3574 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3575 // If we can't find the agent, exit. |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3576 vm_exit_during_initialization(buf, NULL); |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3577 FREE_C_HEAP_ARRAY(char, buf); |
0 | 3578 } |
3579 } else { | |
3580 // Try to load the agent from the standard dll directory | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3581 os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3582 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3583 #ifdef KERNEL |
3584 // Download instrument dll | |
3585 if (library == NULL && strcmp(name, "instrument") == 0) { | |
3586 char *props = Arguments::get_kernel_properties(); | |
3587 char *home = Arguments::get_java_home(); | |
3588 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
3589 " sun.jkernel.DownloadManager -download client_jvm"; | |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3590 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3591 char *cmd = NEW_C_HEAP_ARRAY(char, length); |
0 | 3592 jio_snprintf(cmd, length, fmt, home, props); |
3593 int status = os::fork_and_exec(cmd); | |
3594 FreeHeap(props); | |
3595 if (status == -1) { | |
3596 warning(cmd); | |
3597 vm_exit_during_initialization("fork_and_exec failed: %s", | |
3598 strerror(errno)); | |
3599 } | |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3600 FREE_C_HEAP_ARRAY(char, cmd); |
0 | 3601 // when this comes back the instrument.dll should be where it belongs. |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3602 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3603 } |
3604 #endif // KERNEL | |
3605 if (library == NULL) { // Try the local directory | |
3606 char ns[1] = {0}; | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3607 os::dll_build_name(buffer, sizeof(buffer), ns, name); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3608 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3609 if (library == NULL) { |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3610 const char *sub_msg = " on the library path, with error: "; |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3611 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3612 char *buf = NEW_C_HEAP_ARRAY(char, len); |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3613 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3614 // If we can't find the agent, exit. |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3615 vm_exit_during_initialization(buf, NULL); |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3616 FREE_C_HEAP_ARRAY(char, buf); |
0 | 3617 } |
3618 } | |
3619 } | |
3620 agent->set_os_lib(library); | |
3621 } | |
3622 | |
3623 // Find the OnLoad function. | |
3624 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3625 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
0 | 3626 if (on_load_entry != NULL) break; |
3627 } | |
3628 return on_load_entry; | |
3629 } | |
3630 | |
3631 // Find the JVM_OnLoad entry point | |
3632 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3633 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3634 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3635 } | |
3636 | |
3637 // Find the Agent_OnLoad entry point | |
3638 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3639 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3640 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3641 } | |
3642 | |
3643 // For backwards compatibility with -Xrun | |
3644 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3645 // treated like -agentpath: | |
3646 // Must be called before agent libraries are created | |
3647 void Threads::convert_vm_init_libraries_to_agents() { | |
3648 AgentLibrary* agent; | |
3649 AgentLibrary* next; | |
3650 | |
3651 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3652 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3653 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3654 | |
3655 // If there is an JVM_OnLoad function it will get called later, | |
3656 // otherwise see if there is an Agent_OnLoad | |
3657 if (on_load_entry == NULL) { | |
3658 on_load_entry = lookup_agent_on_load(agent); | |
3659 if (on_load_entry != NULL) { | |
3660 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3661 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3662 Arguments::convert_library_to_agent(agent); | |
3663 } else { | |
3664 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3665 } | |
3666 } | |
3667 } | |
3668 } | |
3669 | |
3670 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3671 // Invokes Agent_OnLoad | |
3672 // Called very early -- before JavaThreads exist | |
3673 void Threads::create_vm_init_agents() { | |
3674 extern struct JavaVM_ main_vm; | |
3675 AgentLibrary* agent; | |
3676 | |
3677 JvmtiExport::enter_onload_phase(); | |
3678 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3679 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3680 | |
3681 if (on_load_entry != NULL) { | |
3682 // Invoke the Agent_OnLoad function | |
3683 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3684 if (err != JNI_OK) { | |
3685 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3686 } | |
3687 } else { | |
3688 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3689 } | |
3690 } | |
3691 JvmtiExport::enter_primordial_phase(); | |
3692 } | |
3693 | |
3694 extern "C" { | |
3695 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3696 } | |
3697 | |
3698 void Threads::shutdown_vm_agents() { | |
3699 // Send any Agent_OnUnload notifications | |
3700 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
3701 extern struct JavaVM_ main_vm; | |
3702 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3703 | |
3704 // Find the Agent_OnUnload function. | |
3705 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
3706 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3707 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
0 | 3708 |
3709 // Invoke the Agent_OnUnload function | |
3710 if (unload_entry != NULL) { | |
3711 JavaThread* thread = JavaThread::current(); | |
3712 ThreadToNativeFromVM ttn(thread); | |
3713 HandleMark hm(thread); | |
3714 (*unload_entry)(&main_vm); | |
3715 break; | |
3716 } | |
3717 } | |
3718 } | |
3719 } | |
3720 | |
3721 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3722 // Invokes JVM_OnLoad | |
3723 void Threads::create_vm_init_libraries() { | |
3724 extern struct JavaVM_ main_vm; | |
3725 AgentLibrary* agent; | |
3726 | |
3727 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3728 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3729 | |
3730 if (on_load_entry != NULL) { | |
3731 // Invoke the JVM_OnLoad function | |
3732 JavaThread* thread = JavaThread::current(); | |
3733 ThreadToNativeFromVM ttn(thread); | |
3734 HandleMark hm(thread); | |
3735 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3736 if (err != JNI_OK) { | |
3737 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3738 } | |
3739 } else { | |
3740 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3741 } | |
3742 } | |
3743 } | |
3744 | |
3745 // Last thread running calls java.lang.Shutdown.shutdown() | |
3746 void JavaThread::invoke_shutdown_hooks() { | |
3747 HandleMark hm(this); | |
3748 | |
3749 // We could get here with a pending exception, if so clear it now. | |
3750 if (this->has_pending_exception()) { | |
3751 this->clear_pending_exception(); | |
3752 } | |
3753 | |
3754 EXCEPTION_MARK; | |
3755 klassOop k = | |
2177
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3756 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
0 | 3757 THREAD); |
3758 if (k != NULL) { | |
3759 // SystemDictionary::resolve_or_null will return null if there was | |
3760 // an exception. If we cannot load the Shutdown class, just don't | |
3761 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3762 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3763 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3764 // was called, the Shutdown class would have already been loaded | |
3765 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3766 instanceKlassHandle shutdown_klass (THREAD, k); | |
3767 JavaValue result(T_VOID); | |
3768 JavaCalls::call_static(&result, | |
3769 shutdown_klass, | |
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3770 vmSymbols::shutdown_method_name(), |
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3771 vmSymbols::void_method_signature(), |
0 | 3772 THREAD); |
3773 } | |
3774 CLEAR_PENDING_EXCEPTION; | |
3775 } | |
3776 | |
3777 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3778 // the program falls off the end of main(). Another VM exit path is through | |
3779 // vm_exit() when the program calls System.exit() to return a value or when | |
3780 // there is a serious error in VM. The two shutdown paths are not exactly | |
3781 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3782 // and VM_Exit op at VM level. | |
3783 // | |
3784 // Shutdown sequence: | |
3785 // + Wait until we are the last non-daemon thread to execute | |
3786 // <-- every thing is still working at this moment --> | |
3787 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3788 // shutdown hooks, run finalizers if finalization-on-exit | |
3789 // + Call before_exit(), prepare for VM exit | |
3790 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3791 // currently the only user of this mechanism is File.deleteOnExit()) | |
3792 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3793 // post thread end and vm death events to JVMTI, | |
3794 // stop signal thread | |
3795 // + Call JavaThread::exit(), it will: | |
3796 // > release JNI handle blocks, remove stack guard pages | |
3797 // > remove this thread from Threads list | |
3798 // <-- no more Java code from this thread after this point --> | |
3799 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3800 // the compiler threads at safepoint | |
3801 // <-- do not use anything that could get blocked by Safepoint --> | |
3802 // + Disable tracing at JNI/JVM barriers | |
3803 // + Set _vm_exited flag for threads that are still running native code | |
3804 // + Delete this thread | |
3805 // + Call exit_globals() | |
3806 // > deletes tty | |
3807 // > deletes PerfMemory resources | |
3808 // + Return to caller | |
3809 | |
3810 bool Threads::destroy_vm() { | |
3811 JavaThread* thread = JavaThread::current(); | |
3812 | |
3813 // Wait until we are the last non-daemon thread to execute | |
3814 { MutexLocker nu(Threads_lock); | |
3815 while (Threads::number_of_non_daemon_threads() > 1 ) | |
3816 // This wait should make safepoint checks, wait without a timeout, | |
3817 // and wait as a suspend-equivalent condition. | |
3818 // | |
3819 // Note: If the FlatProfiler is running and this thread is waiting | |
3820 // for another non-daemon thread to finish, then the FlatProfiler | |
3821 // is waiting for the external suspend request on this thread to | |
3822 // complete. wait_for_ext_suspend_completion() will eventually | |
3823 // timeout, but that takes time. Making this wait a suspend- | |
3824 // equivalent condition solves that timeout problem. | |
3825 // | |
3826 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
3827 Mutex::_as_suspend_equivalent_flag); | |
3828 } | |
3829 | |
3830 // Hang forever on exit if we are reporting an error. | |
3831 if (ShowMessageBoxOnError && is_error_reported()) { | |
3832 os::infinite_sleep(); | |
3833 } | |
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3834 os::wait_for_keypress_at_exit(); |
0 | 3835 |
3836 if (JDK_Version::is_jdk12x_version()) { | |
3837 // We are the last thread running, so check if finalizers should be run. | |
3838 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
3839 HandleMark rm(thread); | |
3840 Universe::run_finalizers_on_exit(); | |
3841 } else { | |
3842 // run Java level shutdown hooks | |
3843 thread->invoke_shutdown_hooks(); | |
3844 } | |
3845 | |
3846 before_exit(thread); | |
3847 | |
3848 thread->exit(true); | |
3849 | |
3850 // Stop VM thread. | |
3851 { | |
3852 // 4945125 The vm thread comes to a safepoint during exit. | |
3853 // GC vm_operations can get caught at the safepoint, and the | |
3854 // heap is unparseable if they are caught. Grab the Heap_lock | |
3855 // to prevent this. The GC vm_operations will not be able to | |
3856 // queue until after the vm thread is dead. | |
3769
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3857 // After this point, we'll never emerge out of the safepoint before |
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3858 // the VM exits, so concurrent GC threads do not need to be explicitly |
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3859 // stopped; they remain inactive until the process exits. |
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3860 // Note: some concurrent G1 threads may be running during a safepoint, |
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3861 // but these will not be accessing the heap, just some G1-specific side |
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3862 // data structures that are not accessed by any other threads but them |
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3863 // after this point in a terminal safepoint. |
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3864 |
0 | 3865 MutexLocker ml(Heap_lock); |
3866 | |
3867 VMThread::wait_for_vm_thread_exit(); | |
3868 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
3869 VMThread::destroy(); | |
3870 } | |
3871 | |
3872 // clean up ideal graph printers | |
3873 #if defined(COMPILER2) && !defined(PRODUCT) | |
3874 IdealGraphPrinter::clean_up(); | |
3875 #endif | |
3876 | |
3877 // Now, all Java threads are gone except daemon threads. Daemon threads | |
3878 // running Java code or in VM are stopped by the Safepoint. However, | |
3879 // daemon threads executing native code are still running. But they | |
3880 // will be stopped at native=>Java/VM barriers. Note that we can't | |
3881 // simply kill or suspend them, as it is inherently deadlock-prone. | |
3882 | |
3883 #ifndef PRODUCT | |
3884 // disable function tracing at JNI/JVM barriers | |
3885 TraceJNICalls = false; | |
3886 TraceJVMCalls = false; | |
3887 TraceRuntimeCalls = false; | |
3888 #endif | |
3889 | |
3890 VM_Exit::set_vm_exited(); | |
3891 | |
3892 notify_vm_shutdown(); | |
3893 | |
3894 delete thread; | |
3895 | |
3896 // exit_globals() will delete tty | |
3897 exit_globals(); | |
3898 | |
3899 return true; | |
3900 } | |
3901 | |
3902 | |
3903 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
3904 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
3905 return is_supported_jni_version(version); | |
3906 } | |
3907 | |
3908 | |
3909 jboolean Threads::is_supported_jni_version(jint version) { | |
3910 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
3911 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
3912 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
3913 return JNI_FALSE; | |
3914 } | |
3915 | |
3916 | |
3917 void Threads::add(JavaThread* p, bool force_daemon) { | |
3918 // The threads lock must be owned at this point | |
3919 assert_locked_or_safepoint(Threads_lock); | |
1842
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3920 |
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3921 // See the comment for this method in thread.hpp for its purpose and |
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3922 // why it is called here. |
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3923 p->initialize_queues(); |
0 | 3924 p->set_next(_thread_list); |
3925 _thread_list = p; | |
3926 _number_of_threads++; | |
3927 oop threadObj = p->threadObj(); | |
3928 bool daemon = true; | |
3929 // Bootstrapping problem: threadObj can be null for initial | |
3930 // JavaThread (or for threads attached via JNI) | |
3931 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
3932 _number_of_non_daemon_threads++; | |
3933 daemon = false; | |
3934 } | |
3935 | |
3936 ThreadService::add_thread(p, daemon); | |
3937 | |
3938 // Possible GC point. | |
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3939 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
0 | 3940 } |
3941 | |
3942 void Threads::remove(JavaThread* p) { | |
3943 // Extra scope needed for Thread_lock, so we can check | |
3944 // that we do not remove thread without safepoint code notice | |
3945 { MutexLocker ml(Threads_lock); | |
3946 | |
3947 assert(includes(p), "p must be present"); | |
3948 | |
3949 JavaThread* current = _thread_list; | |
3950 JavaThread* prev = NULL; | |
3951 | |
3952 while (current != p) { | |
3953 prev = current; | |
3954 current = current->next(); | |
3955 } | |
3956 | |
3957 if (prev) { | |
3958 prev->set_next(current->next()); | |
3959 } else { | |
3960 _thread_list = p->next(); | |
3961 } | |
3962 _number_of_threads--; | |
3963 oop threadObj = p->threadObj(); | |
3964 bool daemon = true; | |
3965 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
3966 _number_of_non_daemon_threads--; | |
3967 daemon = false; | |
3968 | |
3969 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
3970 // on destroy_vm will wake up. | |
3971 if (number_of_non_daemon_threads() == 1) | |
3972 Threads_lock->notify_all(); | |
3973 } | |
3974 ThreadService::remove_thread(p, daemon); | |
3975 | |
3976 // Make sure that safepoint code disregard this thread. This is needed since | |
3977 // the thread might mess around with locks after this point. This can cause it | |
3978 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
3979 // of this thread since it is removed from the queue. | |
3980 p->set_terminated_value(); | |
3981 } // unlock Threads_lock | |
3982 | |
3983 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
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3984 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
0 | 3985 } |
3986 | |
3987 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
3988 bool Threads::includes(JavaThread* p) { | |
3989 assert(Threads_lock->is_locked(), "sanity check"); | |
3990 ALL_JAVA_THREADS(q) { | |
3991 if (q == p ) { | |
3992 return true; | |
3993 } | |
3994 } | |
3995 return false; | |
3996 } | |
3997 | |
3998 // Operations on the Threads list for GC. These are not explicitly locked, | |
3999 // but the garbage collector must provide a safe context for them to run. | |
4000 // In particular, these things should never be called when the Threads_lock | |
4001 // is held by some other thread. (Note: the Safepoint abstraction also | |
4002 // uses the Threads_lock to gurantee this property. It also makes sure that | |
4003 // all threads gets blocked when exiting or starting). | |
4004 | |
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4005 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 4006 ALL_JAVA_THREADS(p) { |
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4007 p->oops_do(f, cf); |
0 | 4008 } |
989
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4009 VMThread::vm_thread()->oops_do(f, cf); |
0 | 4010 } |
4011 | |
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4012 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 4013 // Introduce a mechanism allowing parallel threads to claim threads as |
4014 // root groups. Overhead should be small enough to use all the time, | |
4015 // even in sequential code. | |
4016 SharedHeap* sh = SharedHeap::heap(); | |
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4017 // Cannot yet substitute active_workers for n_par_threads |
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4018 // because of G1CollectedHeap::verify() use of |
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4019 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
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4020 // turn off parallelism in process_strong_roots while active_workers |
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4021 // is being used for parallelism elsewhere. |
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4022 bool is_par = sh->n_par_threads() > 0; |
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4023 assert(!is_par || |
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4024 (SharedHeap::heap()->n_par_threads() == |
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4025 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
0 | 4026 int cp = SharedHeap::heap()->strong_roots_parity(); |
4027 ALL_JAVA_THREADS(p) { | |
4028 if (p->claim_oops_do(is_par, cp)) { | |
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4029 p->oops_do(f, cf); |
0 | 4030 } |
4031 } | |
4032 VMThread* vmt = VMThread::vm_thread(); | |
3979
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4033 if (vmt->claim_oops_do(is_par, cp)) { |
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4034 vmt->oops_do(f, cf); |
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4035 } |
0 | 4036 } |
4037 | |
4038 #ifndef SERIALGC | |
4039 // Used by ParallelScavenge | |
4040 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
4041 ALL_JAVA_THREADS(p) { | |
4042 q->enqueue(new ThreadRootsTask(p)); | |
4043 } | |
4044 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
4045 } | |
4046 | |
4047 // Used by Parallel Old | |
4048 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
4049 ALL_JAVA_THREADS(p) { | |
4050 q->enqueue(new ThreadRootsMarkingTask(p)); | |
4051 } | |
4052 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
4053 } | |
4054 #endif // SERIALGC | |
4055 | |
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4056 void Threads::nmethods_do(CodeBlobClosure* cf) { |
0 | 4057 ALL_JAVA_THREADS(p) { |
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4058 p->nmethods_do(cf); |
0 | 4059 } |
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4060 VMThread::vm_thread()->nmethods_do(cf); |
0 | 4061 } |
4062 | |
4063 void Threads::gc_epilogue() { | |
4064 ALL_JAVA_THREADS(p) { | |
4065 p->gc_epilogue(); | |
4066 } | |
4067 } | |
4068 | |
4069 void Threads::gc_prologue() { | |
4070 ALL_JAVA_THREADS(p) { | |
4071 p->gc_prologue(); | |
4072 } | |
4073 } | |
4074 | |
4075 void Threads::deoptimized_wrt_marked_nmethods() { | |
4076 ALL_JAVA_THREADS(p) { | |
4077 p->deoptimized_wrt_marked_nmethods(); | |
4078 } | |
4079 } | |
4080 | |
4081 | |
4082 // Get count Java threads that are waiting to enter the specified monitor. | |
4083 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
4084 address monitor, bool doLock) { | |
4085 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
4086 "must grab Threads_lock or be at safepoint"); | |
4087 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
4088 | |
4089 int i = 0; | |
4090 { | |
4091 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4092 ALL_JAVA_THREADS(p) { | |
4093 if (p->is_Compiler_thread()) continue; | |
4094 | |
4095 address pending = (address)p->current_pending_monitor(); | |
4096 if (pending == monitor) { // found a match | |
4097 if (i < count) result->append(p); // save the first count matches | |
4098 i++; | |
4099 } | |
4100 } | |
4101 } | |
4102 return result; | |
4103 } | |
4104 | |
4105 | |
4106 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
4107 assert(doLock || | |
4108 Threads_lock->owned_by_self() || | |
4109 SafepointSynchronize::is_at_safepoint(), | |
4110 "must grab Threads_lock or be at safepoint"); | |
4111 | |
4112 // NULL owner means not locked so we can skip the search | |
4113 if (owner == NULL) return NULL; | |
4114 | |
4115 { | |
4116 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4117 ALL_JAVA_THREADS(p) { | |
4118 // first, see if owner is the address of a Java thread | |
4119 if (owner == (address)p) return p; | |
4120 } | |
4121 } | |
4122 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
4123 if (UseHeavyMonitors) return NULL; | |
4124 | |
4125 // | |
4126 // If we didn't find a matching Java thread and we didn't force use of | |
4127 // heavyweight monitors, then the owner is the stack address of the | |
4128 // Lock Word in the owning Java thread's stack. | |
4129 // | |
4130 JavaThread* the_owner = NULL; | |
4131 { | |
4132 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4133 ALL_JAVA_THREADS(q) { | |
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4134 if (q->is_lock_owned(owner)) { |
0 | 4135 the_owner = q; |
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changeset
|
4136 break; |
0 | 4137 } |
4138 } | |
4139 } | |
4140 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
4141 return the_owner; | |
4142 } | |
4143 | |
4144 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
4145 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
4146 char buf[32]; | |
4147 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
4148 | |
4149 st->print_cr("Full thread dump %s (%s %s):", | |
4150 Abstract_VM_Version::vm_name(), | |
4151 Abstract_VM_Version::vm_release(), | |
4152 Abstract_VM_Version::vm_info_string() | |
4153 ); | |
4154 st->cr(); | |
4155 | |
4156 #ifndef SERIALGC | |
4157 // Dump concurrent locks | |
4158 ConcurrentLocksDump concurrent_locks; | |
4159 if (print_concurrent_locks) { | |
4160 concurrent_locks.dump_at_safepoint(); | |
4161 } | |
4162 #endif // SERIALGC | |
4163 | |
4164 ALL_JAVA_THREADS(p) { | |
4165 ResourceMark rm; | |
4166 p->print_on(st); | |
4167 if (print_stacks) { | |
4168 if (internal_format) { | |
4169 p->trace_stack(); | |
4170 } else { | |
4171 p->print_stack_on(st); | |
4172 } | |
4173 } | |
4174 st->cr(); | |
4175 #ifndef SERIALGC | |
4176 if (print_concurrent_locks) { | |
4177 concurrent_locks.print_locks_on(p, st); | |
4178 } | |
4179 #endif // SERIALGC | |
4180 } | |
4181 | |
4182 VMThread::vm_thread()->print_on(st); | |
4183 st->cr(); | |
4184 Universe::heap()->print_gc_threads_on(st); | |
4185 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4186 if (wt != NULL) wt->print_on(st); | |
4187 st->cr(); | |
4188 CompileBroker::print_compiler_threads_on(st); | |
4189 st->flush(); | |
4190 } | |
4191 | |
4192 // Threads::print_on_error() is called by fatal error handler. It's possible | |
4193 // that VM is not at safepoint and/or current thread is inside signal handler. | |
4194 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
4195 // memory (even in resource area), it might deadlock the error handler. | |
4196 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
4197 bool found_current = false; | |
4198 st->print_cr("Java Threads: ( => current thread )"); | |
4199 ALL_JAVA_THREADS(thread) { | |
4200 bool is_current = (current == thread); | |
4201 found_current = found_current || is_current; | |
4202 | |
4203 st->print("%s", is_current ? "=>" : " "); | |
4204 | |
4205 st->print(PTR_FORMAT, thread); | |
4206 st->print(" "); | |
4207 thread->print_on_error(st, buf, buflen); | |
4208 st->cr(); | |
4209 } | |
4210 st->cr(); | |
4211 | |
4212 st->print_cr("Other Threads:"); | |
4213 if (VMThread::vm_thread()) { | |
4214 bool is_current = (current == VMThread::vm_thread()); | |
4215 found_current = found_current || is_current; | |
4216 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
4217 | |
4218 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
4219 st->print(" "); | |
4220 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
4221 st->cr(); | |
4222 } | |
4223 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4224 if (wt != NULL) { | |
4225 bool is_current = (current == wt); | |
4226 found_current = found_current || is_current; | |
4227 st->print("%s", is_current ? "=>" : " "); | |
4228 | |
4229 st->print(PTR_FORMAT, wt); | |
4230 st->print(" "); | |
4231 wt->print_on_error(st, buf, buflen); | |
4232 st->cr(); | |
4233 } | |
4234 if (!found_current) { | |
4235 st->cr(); | |
4236 st->print("=>" PTR_FORMAT " (exited) ", current); | |
4237 current->print_on_error(st, buf, buflen); | |
4238 st->cr(); | |
4239 } | |
4240 } | |
4241 | |
1878 | 4242 // Internal SpinLock and Mutex |
4243 // Based on ParkEvent | |
4244 | |
4245 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
0 | 4246 // |
1878 | 4247 // We employ SpinLocks _only for low-contention, fixed-length |
4248 // short-duration critical sections where we're concerned | |
4249 // about native mutex_t or HotSpot Mutex:: latency. | |
4250 // The mux construct provides a spin-then-block mutual exclusion | |
4251 // mechanism. | |
4252 // | |
4253 // Testing has shown that contention on the ListLock guarding gFreeList | |
4254 // is common. If we implement ListLock as a simple SpinLock it's common | |
4255 // for the JVM to devolve to yielding with little progress. This is true | |
4256 // despite the fact that the critical sections protected by ListLock are | |
4257 // extremely short. | |
0 | 4258 // |
1878 | 4259 // TODO-FIXME: ListLock should be of type SpinLock. |
4260 // We should make this a 1st-class type, integrated into the lock | |
4261 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
4262 // should have sufficient padding to avoid false-sharing and excessive | |
4263 // cache-coherency traffic. | |
4264 | |
4265 | |
4266 typedef volatile int SpinLockT ; | |
4267 | |
4268 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
4269 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
4270 return ; // normal fast-path return | |
4271 } | |
4272 | |
4273 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
4274 TEVENT (SpinAcquire - ctx) ; | |
4275 int ctr = 0 ; | |
4276 int Yields = 0 ; | |
0 | 4277 for (;;) { |
1878 | 4278 while (*adr != 0) { |
4279 ++ctr ; | |
4280 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
4281 if (Yields > 5) { | |
4282 // Consider using a simple NakedSleep() instead. | |
4283 // Then SpinAcquire could be called by non-JVM threads | |
4284 Thread::current()->_ParkEvent->park(1) ; | |
4285 } else { | |
4286 os::NakedYield() ; | |
4287 ++Yields ; | |
4288 } | |
4289 } else { | |
4290 SpinPause() ; | |
0 | 4291 } |
1878 | 4292 } |
4293 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
0 | 4294 } |
4295 } | |
4296 | |
1878 | 4297 void Thread::SpinRelease (volatile int * adr) { |
4298 assert (*adr != 0, "invariant") ; | |
4299 OrderAccess::fence() ; // guarantee at least release consistency. | |
4300 // Roach-motel semantics. | |
4301 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
4302 // but prior LDs and STs within the critical section can't be allowed | |
4303 // to reorder or float past the ST that releases the lock. | |
4304 *adr = 0 ; | |
0 | 4305 } |
4306 | |
1878 | 4307 // muxAcquire and muxRelease: |
4308 // | |
4309 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
4310 // The LSB of the word is set IFF the lock is held. | |
4311 // The remainder of the word points to the head of a singly-linked list | |
4312 // of threads blocked on the lock. | |
4313 // | |
4314 // * The current implementation of muxAcquire-muxRelease uses its own | |
4315 // dedicated Thread._MuxEvent instance. If we're interested in | |
4316 // minimizing the peak number of extant ParkEvent instances then | |
4317 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
4318 // as certain invariants were satisfied. Specifically, care would need | |
4319 // to be taken with regards to consuming unpark() "permits". | |
4320 // A safe rule of thumb is that a thread would never call muxAcquire() | |
4321 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
4322 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
4323 // consume an unpark() permit intended for monitorenter, for instance. | |
4324 // One way around this would be to widen the restricted-range semaphore | |
4325 // implemented in park(). Another alternative would be to provide | |
4326 // multiple instances of the PlatformEvent() for each thread. One | |
4327 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
4328 // | |
4329 // * Usage: | |
4330 // -- Only as leaf locks | |
4331 // -- for short-term locking only as muxAcquire does not perform | |
4332 // thread state transitions. | |
4333 // | |
4334 // Alternatives: | |
4335 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
4336 // but with parking or spin-then-park instead of pure spinning. | |
4337 // * Use Taura-Oyama-Yonenzawa locks. | |
4338 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
4339 // (List,LockByte). Acquire will CAS the full lockword while Release | |
4340 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
4341 // acquiring threads use timers (ParkTimed) to detect and recover from | |
4342 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
4343 // boundaries by using placement-new. | |
4344 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
4345 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
4346 // The validity of the backlinks must be ratified before we trust the value. | |
4347 // If the backlinks are invalid the exiting thread must back-track through the | |
4348 // the forward links, which are always trustworthy. | |
4349 // * Add a successor indication. The LockWord is currently encoded as | |
4350 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
4351 // to provide the usual futile-wakeup optimization. | |
4352 // See RTStt for details. | |
4353 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
4354 // | |
4355 | |
4356 | |
4357 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
4358 enum MuxBits { LOCKBIT = 1 } ; | |
4359 | |
4360 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
4361 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4362 if (w == 0) return ; | |
4363 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4364 return ; | |
4365 } | |
4366 | |
4367 TEVENT (muxAcquire - Contention) ; | |
4368 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
4369 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
0 | 4370 for (;;) { |
1878 | 4371 int its = (os::is_MP() ? 100 : 0) + 1 ; |
4372 | |
4373 // Optional spin phase: spin-then-park strategy | |
4374 while (--its >= 0) { | |
4375 w = *Lock ; | |
4376 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4377 return ; | |
4378 } | |
4379 } | |
4380 | |
4381 Self->reset() ; | |
4382 Self->OnList = intptr_t(Lock) ; | |
4383 // The following fence() isn't _strictly necessary as the subsequent | |
4384 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4385 OrderAccess::fence(); | |
4386 for (;;) { | |
4387 w = *Lock ; | |
4388 if ((w & LOCKBIT) == 0) { | |
4389 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4390 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
4391 return ; | |
4392 } | |
4393 continue ; // Interference -- *Lock changed -- Just retry | |
0 | 4394 } |
1878 | 4395 assert (w & LOCKBIT, "invariant") ; |
4396 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4397 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
4398 } | |
4399 | |
4400 while (Self->OnList != 0) { | |
4401 Self->park() ; | |
4402 } | |
0 | 4403 } |
4404 } | |
4405 | |
1878 | 4406 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
4407 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4408 if (w == 0) return ; | |
4409 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4410 return ; | |
4411 } | |
4412 | |
4413 TEVENT (muxAcquire - Contention) ; | |
4414 ParkEvent * ReleaseAfter = NULL ; | |
4415 if (ev == NULL) { | |
4416 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
4417 } | |
4418 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
4419 for (;;) { | |
4420 guarantee (ev->OnList == 0, "invariant") ; | |
4421 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
4422 | |
4423 // Optional spin phase: spin-then-park strategy | |
4424 while (--its >= 0) { | |
4425 w = *Lock ; | |
4426 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4427 if (ReleaseAfter != NULL) { | |
4428 ParkEvent::Release (ReleaseAfter) ; | |
4429 } | |
4430 return ; | |
4431 } | |
4432 } | |
4433 | |
4434 ev->reset() ; | |
4435 ev->OnList = intptr_t(Lock) ; | |
4436 // The following fence() isn't _strictly necessary as the subsequent | |
4437 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4438 OrderAccess::fence(); | |
4439 for (;;) { | |
4440 w = *Lock ; | |
4441 if ((w & LOCKBIT) == 0) { | |
4442 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4443 ev->OnList = 0 ; | |
4444 // We call ::Release while holding the outer lock, thus | |
4445 // artificially lengthening the critical section. | |
4446 // Consider deferring the ::Release() until the subsequent unlock(), | |
4447 // after we've dropped the outer lock. | |
4448 if (ReleaseAfter != NULL) { | |
4449 ParkEvent::Release (ReleaseAfter) ; | |
4450 } | |
4451 return ; | |
4452 } | |
4453 continue ; // Interference -- *Lock changed -- Just retry | |
4454 } | |
4455 assert (w & LOCKBIT, "invariant") ; | |
4456 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4457 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
4458 } | |
4459 | |
4460 while (ev->OnList != 0) { | |
4461 ev->park() ; | |
4462 } | |
4463 } | |
4464 } | |
4465 | |
4466 // Release() must extract a successor from the list and then wake that thread. | |
4467 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
4468 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
4469 // Release() would : | |
4470 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
4471 // (B) Extract a successor from the private list "in-hand" | |
4472 // (C) attempt to CAS() the residual back into *Lock over null. | |
4473 // If there were any newly arrived threads and the CAS() would fail. | |
4474 // In that case Release() would detach the RATs, re-merge the list in-hand | |
4475 // with the RATs and repeat as needed. Alternately, Release() might | |
4476 // detach and extract a successor, but then pass the residual list to the wakee. | |
4477 // The wakee would be responsible for reattaching and remerging before it | |
4478 // competed for the lock. | |
4479 // | |
4480 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
4481 // multiple concurrent pushers, but only one popper or detacher. | |
4482 // This implementation pops from the head of the list. This is unfair, | |
4483 // but tends to provide excellent throughput as hot threads remain hot. | |
4484 // (We wake recently run threads first). | |
4485 | |
4486 void Thread::muxRelease (volatile intptr_t * Lock) { | |
4487 for (;;) { | |
4488 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
4489 assert (w & LOCKBIT, "invariant") ; | |
4490 if (w == LOCKBIT) return ; | |
4491 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
4492 assert (List != NULL, "invariant") ; | |
4493 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
4494 ParkEvent * nxt = List->ListNext ; | |
4495 | |
4496 // The following CAS() releases the lock and pops the head element. | |
4497 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
4498 continue ; | |
4499 } | |
4500 List->OnList = 0 ; | |
4501 OrderAccess::fence() ; | |
4502 List->unpark () ; | |
4503 return ; | |
4504 } | |
4505 } | |
4506 | |
4507 | |
0 | 4508 void Threads::verify() { |
4509 ALL_JAVA_THREADS(p) { | |
4510 p->verify(); | |
4511 } | |
4512 VMThread* thread = VMThread::vm_thread(); | |
4513 if (thread != NULL) thread->verify(); | |
4514 } |