Mercurial > hg > truffle
annotate src/share/vm/runtime/vm_operations.cpp @ 7090:05ce1defa4f9
Common out some parts of UnsafeLoad/Store in UnsafeAccess
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 29 Nov 2012 13:24:08 +0100 |
parents | 422c979ff392 |
children | 291ffc492eb6 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, 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" | |
37 #include "runtime/vm_operations.hpp" | |
38 #include "services/threadService.hpp" | |
39 #ifdef TARGET_OS_FAMILY_linux | |
40 # include "thread_linux.inline.hpp" | |
41 #endif | |
42 #ifdef TARGET_OS_FAMILY_solaris | |
43 # include "thread_solaris.inline.hpp" | |
44 #endif | |
45 #ifdef TARGET_OS_FAMILY_windows | |
46 # include "thread_windows.inline.hpp" | |
47 #endif | |
3960 | 48 #ifdef TARGET_OS_FAMILY_bsd |
49 # include "thread_bsd.inline.hpp" | |
50 #endif | |
0 | 51 |
52 #define VM_OP_NAME_INITIALIZE(name) #name, | |
53 | |
54 const char* VM_Operation::_names[VM_Operation::VMOp_Terminating] = \ | |
55 { VM_OPS_DO(VM_OP_NAME_INITIALIZE) }; | |
56 | |
57 void VM_Operation::set_calling_thread(Thread* thread, ThreadPriority priority) { | |
58 _calling_thread = thread; | |
59 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
60 _priority = priority; | |
61 } | |
62 | |
63 | |
64 void VM_Operation::evaluate() { | |
65 ResourceMark rm; | |
66 if (TraceVMOperation) { | |
67 tty->print("["); | |
68 NOT_PRODUCT(print();) | |
69 } | |
70 doit(); | |
71 if (TraceVMOperation) { | |
72 tty->print_cr("]"); | |
73 } | |
74 } | |
75 | |
76 // Called by fatal error handler. | |
77 void VM_Operation::print_on_error(outputStream* st) const { | |
78 st->print("VM_Operation (" PTR_FORMAT "): ", this); | |
79 st->print("%s", name()); | |
80 | |
81 const char* mode; | |
82 switch(evaluation_mode()) { | |
83 case _safepoint : mode = "safepoint"; break; | |
84 case _no_safepoint : mode = "no safepoint"; break; | |
85 case _concurrent : mode = "concurrent"; break; | |
86 case _async_safepoint: mode = "async safepoint"; break; | |
87 default : mode = "unknown"; break; | |
88 } | |
89 st->print(", mode: %s", mode); | |
90 | |
91 if (calling_thread()) { | |
92 st->print(", requested by thread " PTR_FORMAT, calling_thread()); | |
93 } | |
94 } | |
95 | |
96 void VM_ThreadStop::doit() { | |
97 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
98 JavaThread* target = java_lang_Thread::thread(target_thread()); | |
99 // Note that this now allows multiple ThreadDeath exceptions to be | |
100 // thrown at a thread. | |
101 if (target != NULL) { | |
102 // the thread has run and is not already in the process of exiting | |
103 target->send_thread_stop(throwable()); | |
104 } | |
105 } | |
106 | |
107 void VM_Deoptimize::doit() { | |
108 // We do not want any GCs to happen while we are in the middle of this VM operation | |
109 ResourceMark rm; | |
110 DeoptimizationMarker dm; | |
111 | |
112 // Deoptimize all activations depending on marked nmethods | |
113 Deoptimization::deoptimize_dependents(); | |
114 | |
115 // Make the dependent methods zombies | |
116 CodeCache::make_marked_nmethods_zombies(); | |
117 } | |
118 | |
119 | |
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120 VM_DeoptimizeFrame::VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id, int reason) { |
0 | 121 _thread = thread; |
122 _id = id; | |
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123 _reason = reason; |
0 | 124 } |
125 | |
126 | |
127 void VM_DeoptimizeFrame::doit() { | |
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128 assert(_reason > Deoptimization::Reason_none && _reason < Deoptimization::Reason_LIMIT, "invalid deopt reason"); |
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129 Deoptimization::deoptimize_frame_internal(_thread, _id, (Deoptimization::DeoptReason)_reason); |
0 | 130 } |
131 | |
132 | |
133 #ifndef PRODUCT | |
134 | |
135 void VM_DeoptimizeAll::doit() { | |
136 DeoptimizationMarker dm; | |
137 // deoptimize all java threads in the system | |
138 if (DeoptimizeALot) { | |
139 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
140 if (thread->has_last_Java_frame()) { | |
141 thread->deoptimize(); | |
142 } | |
143 } | |
144 } else if (DeoptimizeRandom) { | |
145 | |
146 // Deoptimize some selected threads and frames | |
147 int tnum = os::random() & 0x3; | |
148 int fnum = os::random() & 0x3; | |
149 int tcount = 0; | |
150 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
151 if (thread->has_last_Java_frame()) { | |
152 if (tcount++ == tnum) { | |
153 tcount = 0; | |
154 int fcount = 0; | |
155 // Deoptimize some selected frames. | |
156 // Biased llocking wants a updated register map | |
157 for(StackFrameStream fst(thread, UseBiasedLocking); !fst.is_done(); fst.next()) { | |
158 if (fst.current()->can_be_deoptimized()) { | |
159 if (fcount++ == fnum) { | |
160 fcount = 0; | |
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161 Deoptimization::deoptimize(thread, *fst.current(), fst.register_map(), Deoptimization::Reason_constraint); |
0 | 162 } |
163 } | |
164 } | |
165 } | |
166 } | |
167 } | |
168 } | |
169 } | |
170 | |
171 | |
172 void VM_ZombieAll::doit() { | |
173 JavaThread *thread = (JavaThread *)calling_thread(); | |
174 assert(thread->is_Java_thread(), "must be a Java thread"); | |
175 thread->make_zombies(); | |
176 } | |
177 | |
178 #endif // !PRODUCT | |
179 | |
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180 void VM_UnlinkSymbols::doit() { |
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181 JavaThread *thread = (JavaThread *)calling_thread(); |
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182 assert(thread->is_Java_thread(), "must be a Java thread"); |
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183 SymbolTable::unlink(); |
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184 } |
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185 |
1202 | 186 void VM_HandleFullCodeCache::doit() { |
187 NMethodSweeper::speculative_disconnect_nmethods(_is_full); | |
188 } | |
189 | |
0 | 190 void VM_Verify::doit() { |
191 Universe::verify(); | |
192 } | |
193 | |
194 bool VM_PrintThreads::doit_prologue() { | |
195 assert(Thread::current()->is_Java_thread(), "just checking"); | |
196 | |
197 // Make sure AbstractOwnableSynchronizer is loaded | |
198 if (JDK_Version::is_gte_jdk16x_version()) { | |
199 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current()); | |
200 } | |
201 | |
202 // Get Heap_lock if concurrent locks will be dumped | |
203 if (_print_concurrent_locks) { | |
204 Heap_lock->lock(); | |
205 } | |
206 return true; | |
207 } | |
208 | |
209 void VM_PrintThreads::doit() { | |
210 Threads::print_on(_out, true, false, _print_concurrent_locks); | |
211 } | |
212 | |
213 void VM_PrintThreads::doit_epilogue() { | |
214 if (_print_concurrent_locks) { | |
215 // Release Heap_lock | |
216 Heap_lock->unlock(); | |
217 } | |
218 } | |
219 | |
220 void VM_PrintJNI::doit() { | |
221 JNIHandles::print_on(_out); | |
222 } | |
223 | |
224 VM_FindDeadlocks::~VM_FindDeadlocks() { | |
225 if (_deadlocks != NULL) { | |
226 DeadlockCycle* cycle = _deadlocks; | |
227 while (cycle != NULL) { | |
228 DeadlockCycle* d = cycle; | |
229 cycle = cycle->next(); | |
230 delete d; | |
231 } | |
232 } | |
233 } | |
234 | |
235 bool VM_FindDeadlocks::doit_prologue() { | |
236 assert(Thread::current()->is_Java_thread(), "just checking"); | |
237 | |
238 // Load AbstractOwnableSynchronizer class | |
239 if (_concurrent_locks && JDK_Version::is_gte_jdk16x_version()) { | |
240 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current()); | |
241 } | |
242 | |
243 return true; | |
244 } | |
245 | |
246 void VM_FindDeadlocks::doit() { | |
247 _deadlocks = ThreadService::find_deadlocks_at_safepoint(_concurrent_locks); | |
248 if (_out != NULL) { | |
249 int num_deadlocks = 0; | |
250 for (DeadlockCycle* cycle = _deadlocks; cycle != NULL; cycle = cycle->next()) { | |
251 num_deadlocks++; | |
252 cycle->print_on(_out); | |
253 } | |
254 | |
255 if (num_deadlocks == 1) { | |
256 _out->print_cr("\nFound 1 deadlock.\n"); | |
257 _out->flush(); | |
258 } else if (num_deadlocks > 1) { | |
259 _out->print_cr("\nFound %d deadlocks.\n", num_deadlocks); | |
260 _out->flush(); | |
261 } | |
262 } | |
263 } | |
264 | |
265 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result, | |
266 int max_depth, | |
267 bool with_locked_monitors, | |
268 bool with_locked_synchronizers) { | |
269 _result = result; | |
270 _num_threads = 0; // 0 indicates all threads | |
271 _threads = NULL; | |
272 _result = result; | |
273 _max_depth = max_depth; | |
274 _with_locked_monitors = with_locked_monitors; | |
275 _with_locked_synchronizers = with_locked_synchronizers; | |
276 } | |
277 | |
278 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result, | |
279 GrowableArray<instanceHandle>* threads, | |
280 int num_threads, | |
281 int max_depth, | |
282 bool with_locked_monitors, | |
283 bool with_locked_synchronizers) { | |
284 _result = result; | |
285 _num_threads = num_threads; | |
286 _threads = threads; | |
287 _result = result; | |
288 _max_depth = max_depth; | |
289 _with_locked_monitors = with_locked_monitors; | |
290 _with_locked_synchronizers = with_locked_synchronizers; | |
291 } | |
292 | |
293 bool VM_ThreadDump::doit_prologue() { | |
294 assert(Thread::current()->is_Java_thread(), "just checking"); | |
295 | |
296 // Load AbstractOwnableSynchronizer class before taking thread snapshots | |
297 if (JDK_Version::is_gte_jdk16x_version()) { | |
298 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current()); | |
299 } | |
300 | |
301 if (_with_locked_synchronizers) { | |
302 // Acquire Heap_lock to dump concurrent locks | |
303 Heap_lock->lock(); | |
304 } | |
305 | |
306 return true; | |
307 } | |
308 | |
309 void VM_ThreadDump::doit_epilogue() { | |
310 if (_with_locked_synchronizers) { | |
311 // Release Heap_lock | |
312 Heap_lock->unlock(); | |
313 } | |
314 } | |
315 | |
316 void VM_ThreadDump::doit() { | |
317 ResourceMark rm; | |
318 | |
319 ConcurrentLocksDump concurrent_locks(true); | |
320 if (_with_locked_synchronizers) { | |
321 concurrent_locks.dump_at_safepoint(); | |
322 } | |
323 | |
324 if (_num_threads == 0) { | |
325 // Snapshot all live threads | |
326 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) { | |
327 if (jt->is_exiting() || | |
328 jt->is_hidden_from_external_view()) { | |
329 // skip terminating threads and hidden threads | |
330 continue; | |
331 } | |
332 ThreadConcurrentLocks* tcl = NULL; | |
333 if (_with_locked_synchronizers) { | |
334 tcl = concurrent_locks.thread_concurrent_locks(jt); | |
335 } | |
336 ThreadSnapshot* ts = snapshot_thread(jt, tcl); | |
337 _result->add_thread_snapshot(ts); | |
338 } | |
339 } else { | |
340 // Snapshot threads in the given _threads array | |
341 // A dummy snapshot is created if a thread doesn't exist | |
342 for (int i = 0; i < _num_threads; i++) { | |
343 instanceHandle th = _threads->at(i); | |
344 if (th() == NULL) { | |
345 // skip if the thread doesn't exist | |
346 // Add a dummy snapshot | |
347 _result->add_thread_snapshot(new ThreadSnapshot()); | |
348 continue; | |
349 } | |
350 | |
351 // Dump thread stack only if the thread is alive and not exiting | |
352 // and not VM internal thread. | |
353 JavaThread* jt = java_lang_Thread::thread(th()); | |
354 if (jt == NULL || /* thread not alive */ | |
355 jt->is_exiting() || | |
356 jt->is_hidden_from_external_view()) { | |
357 // add a NULL snapshot if skipped | |
358 _result->add_thread_snapshot(new ThreadSnapshot()); | |
359 continue; | |
360 } | |
361 ThreadConcurrentLocks* tcl = NULL; | |
362 if (_with_locked_synchronizers) { | |
363 tcl = concurrent_locks.thread_concurrent_locks(jt); | |
364 } | |
365 ThreadSnapshot* ts = snapshot_thread(jt, tcl); | |
366 _result->add_thread_snapshot(ts); | |
367 } | |
368 } | |
369 } | |
370 | |
371 ThreadSnapshot* VM_ThreadDump::snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl) { | |
372 ThreadSnapshot* snapshot = new ThreadSnapshot(java_thread); | |
373 snapshot->dump_stack_at_safepoint(_max_depth, _with_locked_monitors); | |
374 snapshot->set_concurrent_locks(tcl); | |
375 return snapshot; | |
376 } | |
377 | |
378 volatile bool VM_Exit::_vm_exited = false; | |
379 Thread * VM_Exit::_shutdown_thread = NULL; | |
380 | |
381 int VM_Exit::set_vm_exited() { | |
382 Thread * thr_cur = ThreadLocalStorage::get_thread_slow(); | |
383 | |
384 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already"); | |
385 | |
386 int num_active = 0; | |
387 | |
388 _shutdown_thread = thr_cur; | |
389 _vm_exited = true; // global flag | |
390 for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next()) | |
391 if (thr!=thr_cur && thr->thread_state() == _thread_in_native) { | |
392 ++num_active; | |
393 thr->set_terminated(JavaThread::_vm_exited); // per-thread flag | |
394 } | |
395 | |
396 return num_active; | |
397 } | |
398 | |
399 int VM_Exit::wait_for_threads_in_native_to_block() { | |
400 // VM exits at safepoint. This function must be called at the final safepoint | |
401 // to wait for threads in _thread_in_native state to be quiescent. | |
402 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already"); | |
403 | |
404 Thread * thr_cur = ThreadLocalStorage::get_thread_slow(); | |
405 Monitor timer(Mutex::leaf, "VM_Exit timer", true); | |
406 | |
407 // Compiler threads need longer wait because they can access VM data directly | |
408 // while in native. If they are active and some structures being used are | |
409 // deleted by the shutdown sequence, they will crash. On the other hand, user | |
410 // threads must go through native=>Java/VM transitions first to access VM | |
411 // data, and they will be stopped during state transition. In theory, we | |
412 // don't have to wait for user threads to be quiescent, but it's always | |
413 // better to terminate VM when current thread is the only active thread, so | |
414 // wait for user threads too. Numbers are in 10 milliseconds. | |
415 int max_wait_user_thread = 30; // at least 300 milliseconds | |
416 int max_wait_compiler_thread = 1000; // at least 10 seconds | |
417 | |
418 int max_wait = max_wait_compiler_thread; | |
419 | |
420 int attempts = 0; | |
421 while (true) { | |
422 int num_active = 0; | |
423 int num_active_compiler_thread = 0; | |
424 | |
425 for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next()) { | |
426 if (thr!=thr_cur && thr->thread_state() == _thread_in_native) { | |
427 num_active++; | |
428 if (thr->is_Compiler_thread()) { | |
429 num_active_compiler_thread++; | |
430 } | |
431 } | |
432 } | |
433 | |
434 if (num_active == 0) { | |
435 return 0; | |
436 } else if (attempts > max_wait) { | |
437 return num_active; | |
438 } else if (num_active_compiler_thread == 0 && attempts > max_wait_user_thread) { | |
439 return num_active; | |
440 } | |
441 | |
442 attempts++; | |
443 | |
444 MutexLockerEx ml(&timer, Mutex::_no_safepoint_check_flag); | |
445 timer.wait(Mutex::_no_safepoint_check_flag, 10); | |
446 } | |
447 } | |
448 | |
449 void VM_Exit::doit() { | |
450 CompileBroker::set_should_block(); | |
451 | |
452 // Wait for a short period for threads in native to block. Any thread | |
453 // still executing native code after the wait will be stopped at | |
454 // native==>Java/VM barriers. | |
455 // Among 16276 JCK tests, 94% of them come here without any threads still | |
456 // running in native; the other 6% are quiescent within 250ms (Ultra 80). | |
457 wait_for_threads_in_native_to_block(); | |
458 | |
459 set_vm_exited(); | |
460 | |
461 // cleanup globals resources before exiting. exit_globals() currently | |
462 // cleans up outputStream resources and PerfMemory resources. | |
463 exit_globals(); | |
464 | |
465 // Check for exit hook | |
466 exit_hook_t exit_hook = Arguments::exit_hook(); | |
467 if (exit_hook != NULL) { | |
468 // exit hook should exit. | |
469 exit_hook(_exit_code); | |
470 // ... but if it didn't, we must do it here | |
471 vm_direct_exit(_exit_code); | |
472 } else { | |
473 vm_direct_exit(_exit_code); | |
474 } | |
475 } | |
476 | |
477 | |
478 void VM_Exit::wait_if_vm_exited() { | |
479 if (_vm_exited && | |
480 ThreadLocalStorage::get_thread_slow() != _shutdown_thread) { | |
481 // _vm_exited is set at safepoint, and the Threads_lock is never released | |
482 // we will block here until the process dies | |
483 Threads_lock->lock_without_safepoint_check(); | |
484 ShouldNotReachHere(); | |
485 } | |
486 } |