Mercurial > hg > truffle
annotate src/share/vm/runtime/vm_operations.cpp @ 13040:f8b56489e455
Merge
author | mgronlun |
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date | Fri, 01 Nov 2013 17:10:31 +0000 |
parents | 510fbd28919c |
children | cefad50507d8 78bbf4d43a14 |
rev | line source |
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0 | 1 /* |
10405 | 2 * Copyright (c) 1997, 2013, 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" |
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26 #include "classfile/symbolTable.hpp" |
1972 | 27 #include "classfile/vmSymbols.hpp" |
28 #include "compiler/compileBroker.hpp" | |
29 #include "compiler/compilerOracle.hpp" | |
30 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
31 #include "memory/resourceArea.hpp" | |
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32 #include "oops/symbol.hpp" |
1972 | 33 #include "runtime/arguments.hpp" |
34 #include "runtime/deoptimization.hpp" | |
35 #include "runtime/interfaceSupport.hpp" | |
36 #include "runtime/sweeper.hpp" | |
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37 #include "runtime/thread.inline.hpp" |
1972 | 38 #include "runtime/vm_operations.hpp" |
39 #include "services/threadService.hpp" | |
10405 | 40 #include "trace/tracing.hpp" |
0 | 41 |
42 #define VM_OP_NAME_INITIALIZE(name) #name, | |
43 | |
44 const char* VM_Operation::_names[VM_Operation::VMOp_Terminating] = \ | |
45 { VM_OPS_DO(VM_OP_NAME_INITIALIZE) }; | |
46 | |
47 void VM_Operation::set_calling_thread(Thread* thread, ThreadPriority priority) { | |
48 _calling_thread = thread; | |
49 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
50 _priority = priority; | |
51 } | |
52 | |
53 | |
54 void VM_Operation::evaluate() { | |
55 ResourceMark rm; | |
56 if (TraceVMOperation) { | |
57 tty->print("["); | |
58 NOT_PRODUCT(print();) | |
59 } | |
60 doit(); | |
61 if (TraceVMOperation) { | |
62 tty->print_cr("]"); | |
63 } | |
64 } | |
65 | |
10405 | 66 const char* VM_Operation::mode_to_string(Mode mode) { |
67 switch(mode) { | |
68 case _safepoint : return "safepoint"; | |
69 case _no_safepoint : return "no safepoint"; | |
70 case _concurrent : return "concurrent"; | |
71 case _async_safepoint: return "async safepoint"; | |
72 default : return "unknown"; | |
73 } | |
74 } | |
0 | 75 // Called by fatal error handler. |
76 void VM_Operation::print_on_error(outputStream* st) const { | |
77 st->print("VM_Operation (" PTR_FORMAT "): ", this); | |
78 st->print("%s", name()); | |
79 | |
10405 | 80 const char* mode = mode_to_string(evaluation_mode()); |
0 | 81 st->print(", mode: %s", mode); |
82 | |
83 if (calling_thread()) { | |
84 st->print(", requested by thread " PTR_FORMAT, calling_thread()); | |
85 } | |
86 } | |
87 | |
88 void VM_ThreadStop::doit() { | |
89 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
90 JavaThread* target = java_lang_Thread::thread(target_thread()); | |
91 // Note that this now allows multiple ThreadDeath exceptions to be | |
92 // thrown at a thread. | |
93 if (target != NULL) { | |
94 // the thread has run and is not already in the process of exiting | |
95 target->send_thread_stop(throwable()); | |
96 } | |
97 } | |
98 | |
99 void VM_Deoptimize::doit() { | |
100 // We do not want any GCs to happen while we are in the middle of this VM operation | |
101 ResourceMark rm; | |
102 DeoptimizationMarker dm; | |
103 | |
104 // Deoptimize all activations depending on marked nmethods | |
105 Deoptimization::deoptimize_dependents(); | |
106 | |
107 // Make the dependent methods zombies | |
108 CodeCache::make_marked_nmethods_zombies(); | |
109 } | |
110 | |
111 | |
112 VM_DeoptimizeFrame::VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id) { | |
113 _thread = thread; | |
114 _id = id; | |
115 } | |
116 | |
117 | |
118 void VM_DeoptimizeFrame::doit() { | |
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119 Deoptimization::deoptimize_frame_internal(_thread, _id); |
0 | 120 } |
121 | |
122 | |
123 #ifndef PRODUCT | |
124 | |
125 void VM_DeoptimizeAll::doit() { | |
126 DeoptimizationMarker dm; | |
127 // deoptimize all java threads in the system | |
128 if (DeoptimizeALot) { | |
129 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
130 if (thread->has_last_Java_frame()) { | |
131 thread->deoptimize(); | |
132 } | |
133 } | |
134 } else if (DeoptimizeRandom) { | |
135 | |
136 // Deoptimize some selected threads and frames | |
137 int tnum = os::random() & 0x3; | |
138 int fnum = os::random() & 0x3; | |
139 int tcount = 0; | |
140 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
141 if (thread->has_last_Java_frame()) { | |
142 if (tcount++ == tnum) { | |
143 tcount = 0; | |
144 int fcount = 0; | |
145 // Deoptimize some selected frames. | |
146 // Biased llocking wants a updated register map | |
147 for(StackFrameStream fst(thread, UseBiasedLocking); !fst.is_done(); fst.next()) { | |
148 if (fst.current()->can_be_deoptimized()) { | |
149 if (fcount++ == fnum) { | |
150 fcount = 0; | |
151 Deoptimization::deoptimize(thread, *fst.current(), fst.register_map()); | |
152 } | |
153 } | |
154 } | |
155 } | |
156 } | |
157 } | |
158 } | |
159 } | |
160 | |
161 | |
162 void VM_ZombieAll::doit() { | |
163 JavaThread *thread = (JavaThread *)calling_thread(); | |
164 assert(thread->is_Java_thread(), "must be a Java thread"); | |
165 thread->make_zombies(); | |
166 } | |
167 | |
168 #endif // !PRODUCT | |
169 | |
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170 void VM_UnlinkSymbols::doit() { |
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171 JavaThread *thread = (JavaThread *)calling_thread(); |
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172 assert(thread->is_Java_thread(), "must be a Java thread"); |
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173 SymbolTable::unlink(); |
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174 } |
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175 |
0 | 176 void VM_Verify::doit() { |
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177 Universe::heap()->prepare_for_verify(); |
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178 Universe::verify(_silent); |
0 | 179 } |
180 | |
181 bool VM_PrintThreads::doit_prologue() { | |
182 assert(Thread::current()->is_Java_thread(), "just checking"); | |
183 | |
184 // Make sure AbstractOwnableSynchronizer is loaded | |
185 if (JDK_Version::is_gte_jdk16x_version()) { | |
186 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current()); | |
187 } | |
188 | |
189 // Get Heap_lock if concurrent locks will be dumped | |
190 if (_print_concurrent_locks) { | |
191 Heap_lock->lock(); | |
192 } | |
193 return true; | |
194 } | |
195 | |
196 void VM_PrintThreads::doit() { | |
197 Threads::print_on(_out, true, false, _print_concurrent_locks); | |
198 } | |
199 | |
200 void VM_PrintThreads::doit_epilogue() { | |
201 if (_print_concurrent_locks) { | |
202 // Release Heap_lock | |
203 Heap_lock->unlock(); | |
204 } | |
205 } | |
206 | |
207 void VM_PrintJNI::doit() { | |
208 JNIHandles::print_on(_out); | |
209 } | |
210 | |
211 VM_FindDeadlocks::~VM_FindDeadlocks() { | |
212 if (_deadlocks != NULL) { | |
213 DeadlockCycle* cycle = _deadlocks; | |
214 while (cycle != NULL) { | |
215 DeadlockCycle* d = cycle; | |
216 cycle = cycle->next(); | |
217 delete d; | |
218 } | |
219 } | |
220 } | |
221 | |
222 bool VM_FindDeadlocks::doit_prologue() { | |
223 assert(Thread::current()->is_Java_thread(), "just checking"); | |
224 | |
225 // Load AbstractOwnableSynchronizer class | |
226 if (_concurrent_locks && JDK_Version::is_gte_jdk16x_version()) { | |
227 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current()); | |
228 } | |
229 | |
230 return true; | |
231 } | |
232 | |
233 void VM_FindDeadlocks::doit() { | |
234 _deadlocks = ThreadService::find_deadlocks_at_safepoint(_concurrent_locks); | |
235 if (_out != NULL) { | |
236 int num_deadlocks = 0; | |
237 for (DeadlockCycle* cycle = _deadlocks; cycle != NULL; cycle = cycle->next()) { | |
238 num_deadlocks++; | |
239 cycle->print_on(_out); | |
240 } | |
241 | |
242 if (num_deadlocks == 1) { | |
243 _out->print_cr("\nFound 1 deadlock.\n"); | |
244 _out->flush(); | |
245 } else if (num_deadlocks > 1) { | |
246 _out->print_cr("\nFound %d deadlocks.\n", num_deadlocks); | |
247 _out->flush(); | |
248 } | |
249 } | |
250 } | |
251 | |
252 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result, | |
253 int max_depth, | |
254 bool with_locked_monitors, | |
255 bool with_locked_synchronizers) { | |
256 _result = result; | |
257 _num_threads = 0; // 0 indicates all threads | |
258 _threads = NULL; | |
259 _result = result; | |
260 _max_depth = max_depth; | |
261 _with_locked_monitors = with_locked_monitors; | |
262 _with_locked_synchronizers = with_locked_synchronizers; | |
263 } | |
264 | |
265 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result, | |
266 GrowableArray<instanceHandle>* threads, | |
267 int num_threads, | |
268 int max_depth, | |
269 bool with_locked_monitors, | |
270 bool with_locked_synchronizers) { | |
271 _result = result; | |
272 _num_threads = num_threads; | |
273 _threads = threads; | |
274 _result = result; | |
275 _max_depth = max_depth; | |
276 _with_locked_monitors = with_locked_monitors; | |
277 _with_locked_synchronizers = with_locked_synchronizers; | |
278 } | |
279 | |
280 bool VM_ThreadDump::doit_prologue() { | |
281 assert(Thread::current()->is_Java_thread(), "just checking"); | |
282 | |
283 // Load AbstractOwnableSynchronizer class before taking thread snapshots | |
284 if (JDK_Version::is_gte_jdk16x_version()) { | |
285 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current()); | |
286 } | |
287 | |
288 if (_with_locked_synchronizers) { | |
289 // Acquire Heap_lock to dump concurrent locks | |
290 Heap_lock->lock(); | |
291 } | |
292 | |
293 return true; | |
294 } | |
295 | |
296 void VM_ThreadDump::doit_epilogue() { | |
297 if (_with_locked_synchronizers) { | |
298 // Release Heap_lock | |
299 Heap_lock->unlock(); | |
300 } | |
301 } | |
302 | |
303 void VM_ThreadDump::doit() { | |
304 ResourceMark rm; | |
305 | |
306 ConcurrentLocksDump concurrent_locks(true); | |
307 if (_with_locked_synchronizers) { | |
308 concurrent_locks.dump_at_safepoint(); | |
309 } | |
310 | |
311 if (_num_threads == 0) { | |
312 // Snapshot all live threads | |
313 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
314 if (jt->is_exiting() || | |
315 jt->is_hidden_from_external_view()) { | |
316 // skip terminating threads and hidden threads | |
317 continue; | |
318 } | |
319 ThreadConcurrentLocks* tcl = NULL; | |
320 if (_with_locked_synchronizers) { | |
321 tcl = concurrent_locks.thread_concurrent_locks(jt); | |
322 } | |
323 ThreadSnapshot* ts = snapshot_thread(jt, tcl); | |
324 _result->add_thread_snapshot(ts); | |
325 } | |
326 } else { | |
327 // Snapshot threads in the given _threads array | |
328 // A dummy snapshot is created if a thread doesn't exist | |
329 for (int i = 0; i < _num_threads; i++) { | |
330 instanceHandle th = _threads->at(i); | |
331 if (th() == NULL) { | |
332 // skip if the thread doesn't exist | |
333 // Add a dummy snapshot | |
334 _result->add_thread_snapshot(new ThreadSnapshot()); | |
335 continue; | |
336 } | |
337 | |
338 // Dump thread stack only if the thread is alive and not exiting | |
339 // and not VM internal thread. | |
340 JavaThread* jt = java_lang_Thread::thread(th()); | |
341 if (jt == NULL || /* thread not alive */ | |
342 jt->is_exiting() || | |
343 jt->is_hidden_from_external_view()) { | |
344 // add a NULL snapshot if skipped | |
345 _result->add_thread_snapshot(new ThreadSnapshot()); | |
346 continue; | |
347 } | |
348 ThreadConcurrentLocks* tcl = NULL; | |
349 if (_with_locked_synchronizers) { | |
350 tcl = concurrent_locks.thread_concurrent_locks(jt); | |
351 } | |
352 ThreadSnapshot* ts = snapshot_thread(jt, tcl); | |
353 _result->add_thread_snapshot(ts); | |
354 } | |
355 } | |
356 } | |
357 | |
358 ThreadSnapshot* VM_ThreadDump::snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl) { | |
359 ThreadSnapshot* snapshot = new ThreadSnapshot(java_thread); | |
360 snapshot->dump_stack_at_safepoint(_max_depth, _with_locked_monitors); | |
361 snapshot->set_concurrent_locks(tcl); | |
362 return snapshot; | |
363 } | |
364 | |
365 volatile bool VM_Exit::_vm_exited = false; | |
366 Thread * VM_Exit::_shutdown_thread = NULL; | |
367 | |
368 int VM_Exit::set_vm_exited() { | |
369 Thread * thr_cur = ThreadLocalStorage::get_thread_slow(); | |
370 | |
371 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already"); | |
372 | |
373 int num_active = 0; | |
374 | |
375 _shutdown_thread = thr_cur; | |
376 _vm_exited = true; // global flag | |
377 for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next()) | |
378 if (thr!=thr_cur && thr->thread_state() == _thread_in_native) { | |
379 ++num_active; | |
380 thr->set_terminated(JavaThread::_vm_exited); // per-thread flag | |
381 } | |
382 | |
383 return num_active; | |
384 } | |
385 | |
386 int VM_Exit::wait_for_threads_in_native_to_block() { | |
387 // VM exits at safepoint. This function must be called at the final safepoint | |
388 // to wait for threads in _thread_in_native state to be quiescent. | |
389 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already"); | |
390 | |
391 Thread * thr_cur = ThreadLocalStorage::get_thread_slow(); | |
392 Monitor timer(Mutex::leaf, "VM_Exit timer", true); | |
393 | |
394 // Compiler threads need longer wait because they can access VM data directly | |
395 // while in native. If they are active and some structures being used are | |
396 // deleted by the shutdown sequence, they will crash. On the other hand, user | |
397 // threads must go through native=>Java/VM transitions first to access VM | |
398 // data, and they will be stopped during state transition. In theory, we | |
399 // don't have to wait for user threads to be quiescent, but it's always | |
400 // better to terminate VM when current thread is the only active thread, so | |
401 // wait for user threads too. Numbers are in 10 milliseconds. | |
402 int max_wait_user_thread = 30; // at least 300 milliseconds | |
403 int max_wait_compiler_thread = 1000; // at least 10 seconds | |
404 | |
405 int max_wait = max_wait_compiler_thread; | |
406 | |
407 int attempts = 0; | |
408 while (true) { | |
409 int num_active = 0; | |
410 int num_active_compiler_thread = 0; | |
411 | |
412 for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next()) { | |
413 if (thr!=thr_cur && thr->thread_state() == _thread_in_native) { | |
414 num_active++; | |
415 if (thr->is_Compiler_thread()) { | |
416 num_active_compiler_thread++; | |
417 } | |
418 } | |
419 } | |
420 | |
421 if (num_active == 0) { | |
422 return 0; | |
423 } else if (attempts > max_wait) { | |
424 return num_active; | |
425 } else if (num_active_compiler_thread == 0 && attempts > max_wait_user_thread) { | |
426 return num_active; | |
427 } | |
428 | |
429 attempts++; | |
430 | |
431 MutexLockerEx ml(&timer, Mutex::_no_safepoint_check_flag); | |
432 timer.wait(Mutex::_no_safepoint_check_flag, 10); | |
433 } | |
434 } | |
435 | |
436 void VM_Exit::doit() { | |
437 CompileBroker::set_should_block(); | |
438 | |
439 // Wait for a short period for threads in native to block. Any thread | |
440 // still executing native code after the wait will be stopped at | |
441 // native==>Java/VM barriers. | |
442 // Among 16276 JCK tests, 94% of them come here without any threads still | |
443 // running in native; the other 6% are quiescent within 250ms (Ultra 80). | |
444 wait_for_threads_in_native_to_block(); | |
445 | |
446 set_vm_exited(); | |
447 | |
448 // cleanup globals resources before exiting. exit_globals() currently | |
449 // cleans up outputStream resources and PerfMemory resources. | |
450 exit_globals(); | |
451 | |
452 // Check for exit hook | |
453 exit_hook_t exit_hook = Arguments::exit_hook(); | |
454 if (exit_hook != NULL) { | |
455 // exit hook should exit. | |
456 exit_hook(_exit_code); | |
457 // ... but if it didn't, we must do it here | |
458 vm_direct_exit(_exit_code); | |
459 } else { | |
460 vm_direct_exit(_exit_code); | |
461 } | |
462 } | |
463 | |
464 | |
465 void VM_Exit::wait_if_vm_exited() { | |
466 if (_vm_exited && | |
467 ThreadLocalStorage::get_thread_slow() != _shutdown_thread) { | |
468 // _vm_exited is set at safepoint, and the Threads_lock is never released | |
469 // we will block here until the process dies | |
470 Threads_lock->lock_without_safepoint_check(); | |
471 ShouldNotReachHere(); | |
472 } | |
473 } |