Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 6857:5876f980ea19
Merge
author | collins |
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date | Fri, 12 Oct 2012 11:31:27 -0700 |
parents | fb19af007ffc c3e799c37717 |
children | 7b5885dadbdc |
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" |
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37 #include "memory/metaspaceShared.hpp" |
1972 | 38 #include "memory/oopFactory.hpp" |
39 #include "memory/universe.inline.hpp" | |
40 #include "oops/instanceKlass.hpp" | |
41 #include "oops/objArrayOop.hpp" | |
42 #include "oops/oop.inline.hpp" | |
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43 #include "oops/symbol.hpp" |
1972 | 44 #include "prims/jvm_misc.hpp" |
45 #include "prims/jvmtiExport.hpp" | |
46 #include "prims/jvmtiThreadState.hpp" | |
47 #include "prims/privilegedStack.hpp" | |
48 #include "runtime/aprofiler.hpp" | |
49 #include "runtime/arguments.hpp" | |
50 #include "runtime/biasedLocking.hpp" | |
51 #include "runtime/deoptimization.hpp" | |
52 #include "runtime/fprofiler.hpp" | |
53 #include "runtime/frame.inline.hpp" | |
54 #include "runtime/init.hpp" | |
55 #include "runtime/interfaceSupport.hpp" | |
56 #include "runtime/java.hpp" | |
57 #include "runtime/javaCalls.hpp" | |
58 #include "runtime/jniPeriodicChecker.hpp" | |
59 #include "runtime/memprofiler.hpp" | |
60 #include "runtime/mutexLocker.hpp" | |
61 #include "runtime/objectMonitor.hpp" | |
62 #include "runtime/osThread.hpp" | |
63 #include "runtime/safepoint.hpp" | |
64 #include "runtime/sharedRuntime.hpp" | |
65 #include "runtime/statSampler.hpp" | |
66 #include "runtime/stubRoutines.hpp" | |
67 #include "runtime/task.hpp" | |
68 #include "runtime/threadCritical.hpp" | |
69 #include "runtime/threadLocalStorage.hpp" | |
70 #include "runtime/vframe.hpp" | |
71 #include "runtime/vframeArray.hpp" | |
72 #include "runtime/vframe_hp.hpp" | |
73 #include "runtime/vmThread.hpp" | |
74 #include "runtime/vm_operations.hpp" | |
75 #include "services/attachListener.hpp" | |
76 #include "services/management.hpp" | |
6197 | 77 #include "services/memTracker.hpp" |
1972 | 78 #include "services/threadService.hpp" |
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79 #include "trace/traceEventTypes.hpp" |
1972 | 80 #include "utilities/defaultStream.hpp" |
81 #include "utilities/dtrace.hpp" | |
82 #include "utilities/events.hpp" | |
83 #include "utilities/preserveException.hpp" | |
84 #ifdef TARGET_OS_FAMILY_linux | |
85 # include "os_linux.inline.hpp" | |
86 # include "thread_linux.inline.hpp" | |
87 #endif | |
88 #ifdef TARGET_OS_FAMILY_solaris | |
89 # include "os_solaris.inline.hpp" | |
90 # include "thread_solaris.inline.hpp" | |
91 #endif | |
92 #ifdef TARGET_OS_FAMILY_windows | |
93 # include "os_windows.inline.hpp" | |
94 # include "thread_windows.inline.hpp" | |
95 #endif | |
3960 | 96 #ifdef TARGET_OS_FAMILY_bsd |
97 # include "os_bsd.inline.hpp" | |
98 # include "thread_bsd.inline.hpp" | |
99 #endif | |
1972 | 100 #ifndef SERIALGC |
101 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
102 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
103 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
104 #endif | |
105 #ifdef COMPILER1 | |
106 #include "c1/c1_Compiler.hpp" | |
107 #endif | |
108 #ifdef COMPILER2 | |
109 #include "opto/c2compiler.hpp" | |
110 #include "opto/idealGraphPrinter.hpp" | |
111 #endif | |
0 | 112 |
113 #ifdef DTRACE_ENABLED | |
114 | |
115 // Only bother with this argument setup if dtrace is available | |
116 | |
4006 | 117 #ifndef USDT2 |
0 | 118 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
119 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
120 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
121 intptr_t, intptr_t, bool); | |
122 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
123 intptr_t, intptr_t, bool); | |
124 | |
125 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
126 { \ | |
127 ResourceMark rm(this); \ | |
128 int len = 0; \ | |
129 const char* name = (javathread)->get_thread_name(); \ | |
130 len = strlen(name); \ | |
131 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
132 name, len, \ | |
133 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
134 (javathread)->osthread()->thread_id(), \ | |
135 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
136 } | |
137 | |
4006 | 138 #else /* USDT2 */ |
139 | |
140 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
141 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
142 | |
143 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
144 { \ | |
145 ResourceMark rm(this); \ | |
146 int len = 0; \ | |
147 const char* name = (javathread)->get_thread_name(); \ | |
148 len = strlen(name); \ | |
149 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
150 (char *) name, len, \ | |
151 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
152 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
153 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
154 } | |
155 | |
156 #endif /* USDT2 */ | |
157 | |
0 | 158 #else // ndef DTRACE_ENABLED |
159 | |
160 #define DTRACE_THREAD_PROBE(probe, javathread) | |
161 | |
162 #endif // ndef DTRACE_ENABLED | |
163 | |
6197 | 164 |
0 | 165 // Class hierarchy |
166 // - Thread | |
167 // - VMThread | |
168 // - WatcherThread | |
169 // - ConcurrentMarkSweepThread | |
170 // - JavaThread | |
171 // - CompilerThread | |
172 | |
173 // ======= Thread ======== | |
174 // Support for forcing alignment of thread objects for biased locking | |
6197 | 175 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
0 | 176 if (UseBiasedLocking) { |
177 const int alignment = markOopDesc::biased_lock_alignment; | |
178 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
6197 | 179 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
180 : os::malloc(aligned_size, flags, CURRENT_PC); | |
0 | 181 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
182 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
183 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
184 "JavaThread alignment code overflowed allocated storage"); | |
185 if (TraceBiasedLocking) { | |
186 if (aligned_addr != real_malloc_addr) | |
187 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
188 real_malloc_addr, aligned_addr); | |
189 } | |
190 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
191 return aligned_addr; | |
192 } else { | |
6197 | 193 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
194 : os::malloc(size, flags, CURRENT_PC); | |
0 | 195 } |
196 } | |
197 | |
198 void Thread::operator delete(void* p) { | |
199 if (UseBiasedLocking) { | |
200 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
6197 | 201 FreeHeap(real_malloc_addr, mtThread); |
0 | 202 } else { |
6197 | 203 FreeHeap(p, mtThread); |
0 | 204 } |
205 } | |
206 | |
207 | |
208 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
209 // JavaThread | |
210 | |
211 | |
212 Thread::Thread() { | |
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213 // stack and get_thread |
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214 set_stack_base(NULL); |
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215 set_stack_size(0); |
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216 set_self_raw_id(0); |
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217 set_lgrp_id(-1); |
0 | 218 |
219 // allocated data structures | |
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220 set_osthread(NULL); |
6197 | 221 set_resource_area(new (mtThread)ResourceArea()); |
222 set_handle_area(new (mtThread) HandleArea(NULL)); | |
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223 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(300, true)); |
0 | 224 set_active_handles(NULL); |
225 set_free_handle_block(NULL); | |
226 set_last_handle_mark(NULL); | |
227 | |
228 // This initial value ==> never claimed. | |
229 _oops_do_parity = 0; | |
230 | |
231 // the handle mark links itself to last_handle_mark | |
232 new HandleMark(this); | |
233 | |
234 // plain initialization | |
235 debug_only(_owned_locks = NULL;) | |
236 debug_only(_allow_allocation_count = 0;) | |
237 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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238 NOT_PRODUCT(_skip_gcalot = false;) |
0 | 239 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
240 _jvmti_env_iteration_count = 0; | |
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241 set_allocated_bytes(0); |
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242 set_trace_buffer(NULL); |
0 | 243 _vm_operation_started_count = 0; |
244 _vm_operation_completed_count = 0; | |
245 _current_pending_monitor = NULL; | |
246 _current_pending_monitor_is_from_java = true; | |
247 _current_waiting_monitor = NULL; | |
248 _num_nested_signal = 0; | |
249 omFreeList = NULL ; | |
250 omFreeCount = 0 ; | |
251 omFreeProvision = 32 ; | |
1587 | 252 omInUseList = NULL ; |
253 omInUseCount = 0 ; | |
0 | 254 |
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255 #ifdef ASSERT |
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256 _visited_for_critical_count = false; |
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257 #endif |
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258 |
0 | 259 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
260 _suspend_flags = 0; | |
261 | |
262 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
263 _hashStateX = os::random() ; | |
264 _hashStateY = 842502087 ; | |
265 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
266 _hashStateW = 273326509 ; | |
267 | |
268 _OnTrap = 0 ; | |
269 _schedctl = NULL ; | |
270 _Stalled = 0 ; | |
271 _TypeTag = 0x2BAD ; | |
272 | |
273 // Many of the following fields are effectively final - immutable | |
274 // Note that nascent threads can't use the Native Monitor-Mutex | |
275 // construct until the _MutexEvent is initialized ... | |
276 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
277 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
278 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
279 // and ::Release() | |
280 _ParkEvent = ParkEvent::Allocate (this) ; | |
281 _SleepEvent = ParkEvent::Allocate (this) ; | |
282 _MutexEvent = ParkEvent::Allocate (this) ; | |
283 _MuxEvent = ParkEvent::Allocate (this) ; | |
284 | |
285 #ifdef CHECK_UNHANDLED_OOPS | |
286 if (CheckUnhandledOops) { | |
287 _unhandled_oops = new UnhandledOops(this); | |
288 } | |
289 #endif // CHECK_UNHANDLED_OOPS | |
290 #ifdef ASSERT | |
291 if (UseBiasedLocking) { | |
292 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
293 assert(this == _real_malloc_address || | |
294 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
295 "bug in forced alignment of thread objects"); | |
296 } | |
297 #endif /* ASSERT */ | |
298 } | |
299 | |
300 void Thread::initialize_thread_local_storage() { | |
301 // Note: Make sure this method only calls | |
302 // non-blocking operations. Otherwise, it might not work | |
303 // with the thread-startup/safepoint interaction. | |
304 | |
305 // During Java thread startup, safepoint code should allow this | |
306 // method to complete because it may need to allocate memory to | |
307 // store information for the new thread. | |
308 | |
309 // initialize structure dependent on thread local storage | |
310 ThreadLocalStorage::set_thread(this); | |
311 } | |
312 | |
313 void Thread::record_stack_base_and_size() { | |
314 set_stack_base(os::current_stack_base()); | |
315 set_stack_size(os::current_stack_size()); | |
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316 // CR 7190089: on Solaris, primordial thread's stack is adjusted |
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317 // in initialize_thread(). Without the adjustment, stack size is |
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318 // incorrect if stack is set to unlimited (ulimit -s unlimited). |
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319 // So far, only Solaris has real implementation of initialize_thread(). |
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320 // |
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321 // set up any platform-specific state. |
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322 os::initialize_thread(this); |
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323 |
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324 #if INCLUDE_NMT |
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325 // record thread's native stack, stack grows downward |
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326 if (MemTracker::is_on()) { |
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327 address stack_low_addr = stack_base() - stack_size(); |
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328 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, |
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329 CURRENT_PC); |
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330 } |
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331 #endif // INCLUDE_NMT |
0 | 332 } |
333 | |
334 | |
335 Thread::~Thread() { | |
336 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
337 ObjectSynchronizer::omFlush (this) ; | |
338 | |
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339 // stack_base can be NULL if the thread is never started or exited before |
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340 // record_stack_base_and_size called. Although, we would like to ensure |
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341 // that all started threads do call record_stack_base_and_size(), there is |
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342 // not proper way to enforce that. |
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343 #if INCLUDE_NMT |
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344 if (_stack_base != NULL) { |
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345 address low_stack_addr = stack_base() - stack_size(); |
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346 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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347 } |
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348 #endif // INCLUDE_NMT |
6197 | 349 |
0 | 350 // deallocate data structures |
351 delete resource_area(); | |
352 // since the handle marks are using the handle area, we have to deallocated the root | |
353 // handle mark before deallocating the thread's handle area, | |
354 assert(last_handle_mark() != NULL, "check we have an element"); | |
355 delete last_handle_mark(); | |
356 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
357 | |
358 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
359 // We NULL out the fields for good hygiene. | |
360 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
361 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
362 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
363 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
364 | |
365 delete handle_area(); | |
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366 delete metadata_handles(); |
0 | 367 |
368 // osthread() can be NULL, if creation of thread failed. | |
369 if (osthread() != NULL) os::free_thread(osthread()); | |
370 | |
371 delete _SR_lock; | |
372 | |
373 // clear thread local storage if the Thread is deleting itself | |
374 if (this == Thread::current()) { | |
375 ThreadLocalStorage::set_thread(NULL); | |
376 } else { | |
377 // In the case where we're not the current thread, invalidate all the | |
378 // caches in case some code tries to get the current thread or the | |
379 // thread that was destroyed, and gets stale information. | |
380 ThreadLocalStorage::invalidate_all(); | |
381 } | |
382 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
383 } | |
384 | |
385 // NOTE: dummy function for assertion purpose. | |
386 void Thread::run() { | |
387 ShouldNotReachHere(); | |
388 } | |
389 | |
390 #ifdef ASSERT | |
391 // Private method to check for dangling thread pointer | |
392 void check_for_dangling_thread_pointer(Thread *thread) { | |
393 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
394 "possibility of dangling Thread pointer"); | |
395 } | |
396 #endif | |
397 | |
398 | |
399 #ifndef PRODUCT | |
400 // Tracing method for basic thread operations | |
401 void Thread::trace(const char* msg, const Thread* const thread) { | |
402 if (!TraceThreadEvents) return; | |
403 ResourceMark rm; | |
404 ThreadCritical tc; | |
405 const char *name = "non-Java thread"; | |
406 int prio = -1; | |
407 if (thread->is_Java_thread() | |
408 && !thread->is_Compiler_thread()) { | |
409 // The Threads_lock must be held to get information about | |
410 // this thread but may not be in some situations when | |
411 // tracing thread events. | |
412 bool release_Threads_lock = false; | |
413 if (!Threads_lock->owned_by_self()) { | |
414 Threads_lock->lock(); | |
415 release_Threads_lock = true; | |
416 } | |
417 JavaThread* jt = (JavaThread *)thread; | |
418 name = (char *)jt->get_thread_name(); | |
419 oop thread_oop = jt->threadObj(); | |
420 if (thread_oop != NULL) { | |
421 prio = java_lang_Thread::priority(thread_oop); | |
422 } | |
423 if (release_Threads_lock) { | |
424 Threads_lock->unlock(); | |
425 } | |
426 } | |
427 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
428 } | |
429 #endif | |
430 | |
431 | |
432 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
433 trace("get priority", thread); | |
434 ThreadPriority priority; | |
435 // Can return an error! | |
436 (void)os::get_priority(thread, priority); | |
437 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
438 return priority; | |
439 } | |
440 | |
441 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
442 trace("set priority", thread); | |
443 debug_only(check_for_dangling_thread_pointer(thread);) | |
444 // Can return an error! | |
445 (void)os::set_priority(thread, priority); | |
446 } | |
447 | |
448 | |
449 void Thread::start(Thread* thread) { | |
450 trace("start", thread); | |
451 // Start is different from resume in that its safety is guaranteed by context or | |
452 // being called from a Java method synchronized on the Thread object. | |
453 if (!DisableStartThread) { | |
454 if (thread->is_Java_thread()) { | |
455 // Initialize the thread state to RUNNABLE before starting this thread. | |
456 // Can not set it after the thread started because we do not know the | |
457 // exact thread state at that time. It could be in MONITOR_WAIT or | |
458 // in SLEEPING or some other state. | |
459 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
460 java_lang_Thread::RUNNABLE); | |
461 } | |
462 os::start_thread(thread); | |
463 } | |
464 } | |
465 | |
466 // Enqueue a VM_Operation to do the job for us - sometime later | |
467 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
468 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
469 VMThread::execute(vm_stop); | |
470 } | |
471 | |
472 | |
473 // | |
474 // Check if an external suspend request has completed (or has been | |
475 // cancelled). Returns true if the thread is externally suspended and | |
476 // false otherwise. | |
477 // | |
478 // The bits parameter returns information about the code path through | |
479 // the routine. Useful for debugging: | |
480 // | |
481 // set in is_ext_suspend_completed(): | |
482 // 0x00000001 - routine was entered | |
483 // 0x00000010 - routine return false at end | |
484 // 0x00000100 - thread exited (return false) | |
485 // 0x00000200 - suspend request cancelled (return false) | |
486 // 0x00000400 - thread suspended (return true) | |
487 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
488 // 0x00002000 - thread is native and walkable (return true) | |
489 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
490 // | |
491 // set in wait_for_ext_suspend_completion(): | |
492 // 0x00010000 - routine was entered | |
493 // 0x00020000 - suspend request cancelled before loop (return false) | |
494 // 0x00040000 - thread suspended before loop (return true) | |
495 // 0x00080000 - suspend request cancelled in loop (return false) | |
496 // 0x00100000 - thread suspended in loop (return true) | |
497 // 0x00200000 - suspend not completed during retry loop (return false) | |
498 // | |
499 | |
500 // Helper class for tracing suspend wait debug bits. | |
501 // | |
502 // 0x00000100 indicates that the target thread exited before it could | |
503 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
504 // 0x00080000 each indicate a cancelled suspend request so they don't | |
505 // count as wait failures either. | |
506 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
507 | |
508 class TraceSuspendDebugBits : public StackObj { | |
509 private: | |
510 JavaThread * jt; | |
511 bool is_wait; | |
512 bool called_by_wait; // meaningful when !is_wait | |
513 uint32_t * bits; | |
514 | |
515 public: | |
516 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
517 uint32_t *_bits) { | |
518 jt = _jt; | |
519 is_wait = _is_wait; | |
520 called_by_wait = _called_by_wait; | |
521 bits = _bits; | |
522 } | |
523 | |
524 ~TraceSuspendDebugBits() { | |
525 if (!is_wait) { | |
526 #if 1 | |
527 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
528 // That trace is very chatty. | |
529 return; | |
530 #else | |
531 if (!called_by_wait) { | |
532 // If tracing for is_ext_suspend_completed() is enabled, then only | |
533 // trace calls to it from wait_for_ext_suspend_completion() | |
534 return; | |
535 } | |
536 #endif | |
537 } | |
538 | |
539 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
540 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
541 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
542 ResourceMark rm; | |
543 | |
544 tty->print_cr( | |
545 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
546 jt->get_thread_name(), *bits); | |
547 | |
548 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
549 } | |
550 } | |
551 } | |
552 }; | |
553 #undef DEBUG_FALSE_BITS | |
554 | |
555 | |
556 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
557 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
558 | |
559 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
560 bool do_trans_retry; // flag to force the retry | |
561 | |
562 *bits |= 0x00000001; | |
563 | |
564 do { | |
565 do_trans_retry = false; | |
566 | |
567 if (is_exiting()) { | |
568 // Thread is in the process of exiting. This is always checked | |
569 // first to reduce the risk of dereferencing a freed JavaThread. | |
570 *bits |= 0x00000100; | |
571 return false; | |
572 } | |
573 | |
574 if (!is_external_suspend()) { | |
575 // Suspend request is cancelled. This is always checked before | |
576 // is_ext_suspended() to reduce the risk of a rogue resume | |
577 // confusing the thread that made the suspend request. | |
578 *bits |= 0x00000200; | |
579 return false; | |
580 } | |
581 | |
582 if (is_ext_suspended()) { | |
583 // thread is suspended | |
584 *bits |= 0x00000400; | |
585 return true; | |
586 } | |
587 | |
588 // Now that we no longer do hard suspends of threads running | |
589 // native code, the target thread can be changing thread state | |
590 // while we are in this routine: | |
591 // | |
592 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
593 // | |
594 // We save a copy of the thread state as observed at this moment | |
595 // and make our decision about suspend completeness based on the | |
596 // copy. This closes the race where the thread state is seen as | |
597 // _thread_in_native_trans in the if-thread_blocked check, but is | |
598 // seen as _thread_blocked in if-thread_in_native_trans check. | |
599 JavaThreadState save_state = thread_state(); | |
600 | |
601 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
602 // If the thread's state is _thread_blocked and this blocking | |
603 // condition is known to be equivalent to a suspend, then we can | |
604 // consider the thread to be externally suspended. This means that | |
605 // the code that sets _thread_blocked has been modified to do | |
606 // self-suspension if the blocking condition releases. We also | |
607 // used to check for CONDVAR_WAIT here, but that is now covered by | |
608 // the _thread_blocked with self-suspension check. | |
609 // | |
610 // Return true since we wouldn't be here unless there was still an | |
611 // external suspend request. | |
612 *bits |= 0x00001000; | |
613 return true; | |
614 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
615 // Threads running native code will self-suspend on native==>VM/Java | |
616 // transitions. If its stack is walkable (should always be the case | |
617 // unless this function is called before the actual java_suspend() | |
618 // call), then the wait is done. | |
619 *bits |= 0x00002000; | |
620 return true; | |
621 } else if (!called_by_wait && !did_trans_retry && | |
622 save_state == _thread_in_native_trans && | |
623 frame_anchor()->walkable()) { | |
624 // The thread is transitioning from thread_in_native to another | |
625 // thread state. check_safepoint_and_suspend_for_native_trans() | |
626 // will force the thread to self-suspend. If it hasn't gotten | |
627 // there yet we may have caught the thread in-between the native | |
628 // code check above and the self-suspend. Lucky us. If we were | |
629 // called by wait_for_ext_suspend_completion(), then it | |
630 // will be doing the retries so we don't have to. | |
631 // | |
632 // Since we use the saved thread state in the if-statement above, | |
633 // there is a chance that the thread has already transitioned to | |
634 // _thread_blocked by the time we get here. In that case, we will | |
635 // make a single unnecessary pass through the logic below. This | |
636 // doesn't hurt anything since we still do the trans retry. | |
637 | |
638 *bits |= 0x00004000; | |
639 | |
640 // Once the thread leaves thread_in_native_trans for another | |
641 // thread state, we break out of this retry loop. We shouldn't | |
642 // need this flag to prevent us from getting back here, but | |
643 // sometimes paranoia is good. | |
644 did_trans_retry = true; | |
645 | |
646 // We wait for the thread to transition to a more usable state. | |
647 for (int i = 1; i <= SuspendRetryCount; i++) { | |
648 // We used to do an "os::yield_all(i)" call here with the intention | |
649 // that yielding would increase on each retry. However, the parameter | |
650 // is ignored on Linux which means the yield didn't scale up. Waiting | |
651 // on the SR_lock below provides a much more predictable scale up for | |
652 // the delay. It also provides a simple/direct point to check for any | |
653 // safepoint requests from the VMThread | |
654 | |
655 // temporarily drops SR_lock while doing wait with safepoint check | |
656 // (if we're a JavaThread - the WatcherThread can also call this) | |
657 // and increase delay with each retry | |
658 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
659 | |
660 // check the actual thread state instead of what we saved above | |
661 if (thread_state() != _thread_in_native_trans) { | |
662 // the thread has transitioned to another thread state so | |
663 // try all the checks (except this one) one more time. | |
664 do_trans_retry = true; | |
665 break; | |
666 } | |
667 } // end retry loop | |
668 | |
669 | |
670 } | |
671 } while (do_trans_retry); | |
672 | |
673 *bits |= 0x00000010; | |
674 return false; | |
675 } | |
676 | |
677 // | |
678 // Wait for an external suspend request to complete (or be cancelled). | |
679 // Returns true if the thread is externally suspended and false otherwise. | |
680 // | |
681 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
682 uint32_t *bits) { | |
683 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
684 false /* !called_by_wait */, bits); | |
685 | |
686 // local flag copies to minimize SR_lock hold time | |
687 bool is_suspended; | |
688 bool pending; | |
689 uint32_t reset_bits; | |
690 | |
691 // set a marker so is_ext_suspend_completed() knows we are the caller | |
692 *bits |= 0x00010000; | |
693 | |
694 // We use reset_bits to reinitialize the bits value at the top of | |
695 // each retry loop. This allows the caller to make use of any | |
696 // unused bits for their own marking purposes. | |
697 reset_bits = *bits; | |
698 | |
699 { | |
700 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
701 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
702 delay, bits); | |
703 pending = is_external_suspend(); | |
704 } | |
705 // must release SR_lock to allow suspension to complete | |
706 | |
707 if (!pending) { | |
708 // A cancelled suspend request is the only false return from | |
709 // is_ext_suspend_completed() that keeps us from entering the | |
710 // retry loop. | |
711 *bits |= 0x00020000; | |
712 return false; | |
713 } | |
714 | |
715 if (is_suspended) { | |
716 *bits |= 0x00040000; | |
717 return true; | |
718 } | |
719 | |
720 for (int i = 1; i <= retries; i++) { | |
721 *bits = reset_bits; // reinit to only track last retry | |
722 | |
723 // We used to do an "os::yield_all(i)" call here with the intention | |
724 // that yielding would increase on each retry. However, the parameter | |
725 // is ignored on Linux which means the yield didn't scale up. Waiting | |
726 // on the SR_lock below provides a much more predictable scale up for | |
727 // the delay. It also provides a simple/direct point to check for any | |
728 // safepoint requests from the VMThread | |
729 | |
730 { | |
731 MutexLocker ml(SR_lock()); | |
732 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
733 // can also call this) and increase delay with each retry | |
734 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
735 | |
736 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
737 delay, bits); | |
738 | |
739 // It is possible for the external suspend request to be cancelled | |
740 // (by a resume) before the actual suspend operation is completed. | |
741 // Refresh our local copy to see if we still need to wait. | |
742 pending = is_external_suspend(); | |
743 } | |
744 | |
745 if (!pending) { | |
746 // A cancelled suspend request is the only false return from | |
747 // is_ext_suspend_completed() that keeps us from staying in the | |
748 // retry loop. | |
749 *bits |= 0x00080000; | |
750 return false; | |
751 } | |
752 | |
753 if (is_suspended) { | |
754 *bits |= 0x00100000; | |
755 return true; | |
756 } | |
757 } // end retry loop | |
758 | |
759 // thread did not suspend after all our retries | |
760 *bits |= 0x00200000; | |
761 return false; | |
762 } | |
763 | |
764 #ifndef PRODUCT | |
765 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
766 | |
767 // This should not need to be atomic as the only way for simultaneous | |
768 // updates is via interrupts. Even then this should be rare or non-existant | |
769 // and we don't care that much anyway. | |
770 | |
771 int index = _jmp_ring_index; | |
772 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
773 _jmp_ring[index]._target = (intptr_t) target; | |
774 _jmp_ring[index]._instruction = (intptr_t) instr; | |
775 _jmp_ring[index]._file = file; | |
776 _jmp_ring[index]._line = line; | |
777 } | |
778 #endif /* PRODUCT */ | |
779 | |
780 // Called by flat profiler | |
781 // Callers have already called wait_for_ext_suspend_completion | |
782 // The assertion for that is currently too complex to put here: | |
783 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
784 bool gotframe = false; | |
785 // self suspension saves needed state. | |
786 if (has_last_Java_frame() && _anchor.walkable()) { | |
787 *_fr = pd_last_frame(); | |
788 gotframe = true; | |
789 } | |
790 return gotframe; | |
791 } | |
792 | |
793 void Thread::interrupt(Thread* thread) { | |
794 trace("interrupt", thread); | |
795 debug_only(check_for_dangling_thread_pointer(thread);) | |
796 os::interrupt(thread); | |
797 } | |
798 | |
799 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
800 trace("is_interrupted", thread); | |
801 debug_only(check_for_dangling_thread_pointer(thread);) | |
802 // Note: If clear_interrupted==false, this simply fetches and | |
803 // returns the value of the field osthread()->interrupted(). | |
804 return os::is_interrupted(thread, clear_interrupted); | |
805 } | |
806 | |
807 | |
808 // GC Support | |
809 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
810 jint thread_parity = _oops_do_parity; | |
811 if (thread_parity != strong_roots_parity) { | |
812 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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813 if (res == thread_parity) { |
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814 return true; |
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815 } else { |
0 | 816 guarantee(res == strong_roots_parity, "Or else what?"); |
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817 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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818 "Should only fail when parallel."); |
0 | 819 return false; |
820 } | |
821 } | |
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822 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
0 | 823 "Should only fail when parallel."); |
824 return false; | |
825 } | |
826 | |
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827 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 828 active_handles()->oops_do(f); |
829 // Do oop for ThreadShadow | |
830 f->do_oop((oop*)&_pending_exception); | |
831 handle_area()->oops_do(f); | |
832 } | |
833 | |
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834 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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835 // no nmethods in a generic thread... |
0 | 836 } |
837 | |
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838 void Thread::metadata_do(void f(Metadata*)) { |
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839 if (metadata_handles() != NULL) { |
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840 for (int i = 0; i< metadata_handles()->length(); i++) { |
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841 f(metadata_handles()->at(i)); |
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842 } |
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843 } |
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844 } |
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845 |
0 | 846 void Thread::print_on(outputStream* st) const { |
847 // get_priority assumes osthread initialized | |
848 if (osthread() != NULL) { | |
6766 | 849 int os_prio; |
850 if (os::get_native_priority(this, &os_prio) == OS_OK) { | |
851 st->print("os_prio=%d ", os_prio); | |
852 } | |
853 st->print("tid=" INTPTR_FORMAT " ", this); | |
0 | 854 osthread()->print_on(st); |
855 } | |
856 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
857 } | |
858 | |
859 // Thread::print_on_error() is called by fatal error handler. Don't use | |
860 // any lock or allocate memory. | |
861 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
862 if (is_VM_thread()) st->print("VMThread"); | |
863 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
864 else if (is_Java_thread()) st->print("JavaThread"); | |
865 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
866 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
867 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
868 else st->print("Thread"); | |
869 | |
870 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
871 _stack_base - _stack_size, _stack_base); | |
872 | |
873 if (osthread()) { | |
874 st->print(" [id=%d]", osthread()->thread_id()); | |
875 } | |
876 } | |
877 | |
878 #ifdef ASSERT | |
879 void Thread::print_owned_locks_on(outputStream* st) const { | |
880 Monitor *cur = _owned_locks; | |
881 if (cur == NULL) { | |
882 st->print(" (no locks) "); | |
883 } else { | |
884 st->print_cr(" Locks owned:"); | |
885 while(cur) { | |
886 cur->print_on(st); | |
887 cur = cur->next(); | |
888 } | |
889 } | |
890 } | |
891 | |
892 static int ref_use_count = 0; | |
893 | |
894 bool Thread::owns_locks_but_compiled_lock() const { | |
895 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
896 if (cur != Compile_lock) return true; | |
897 } | |
898 return false; | |
899 } | |
900 | |
901 | |
902 #endif | |
903 | |
904 #ifndef PRODUCT | |
905 | |
906 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
907 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
908 // no threads which allow_vm_block's are held | |
909 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
910 // Check if current thread is allowed to block at a safepoint | |
911 if (!(_allow_safepoint_count == 0)) | |
912 fatal("Possible safepoint reached by thread that does not allow it"); | |
913 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
914 fatal("LEAF method calling lock?"); | |
915 } | |
916 | |
917 #ifdef ASSERT | |
918 if (potential_vm_operation && is_Java_thread() | |
919 && !Universe::is_bootstrapping()) { | |
920 // Make sure we do not hold any locks that the VM thread also uses. | |
921 // This could potentially lead to deadlocks | |
922 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
923 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
924 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
925 // since it is used to transfer control between JavaThreads and the VMThread | |
926 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
927 if ( (cur->allow_vm_block() && | |
928 cur != Threads_lock && | |
929 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
930 cur != VMOperationRequest_lock && | |
931 cur != VMOperationQueue_lock) || | |
932 cur->rank() == Mutex::special) { | |
933 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
934 } | |
935 } | |
936 } | |
937 | |
938 if (GCALotAtAllSafepoints) { | |
939 // We could enter a safepoint here and thus have a gc | |
940 InterfaceSupport::check_gc_alot(); | |
941 } | |
942 #endif | |
943 } | |
944 #endif | |
945 | |
946 bool Thread::is_in_stack(address adr) const { | |
947 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
948 address end = os::current_stack_pointer(); | |
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949 // Allow non Java threads to call this without stack_base |
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950 if (_stack_base == NULL) return true; |
0 | 951 if (stack_base() >= adr && adr >= end) return true; |
952 | |
953 return false; | |
954 } | |
955 | |
956 | |
957 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
958 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
959 // used for compilation in the future. If that change is made, the need for these methods | |
960 // should be revisited, and they should be removed if possible. | |
961 | |
962 bool Thread::is_lock_owned(address adr) const { | |
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963 return on_local_stack(adr); |
0 | 964 } |
965 | |
966 bool Thread::set_as_starting_thread() { | |
967 // NOTE: this must be called inside the main thread. | |
968 return os::create_main_thread((JavaThread*)this); | |
969 } | |
970 | |
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971 static void initialize_class(Symbol* class_name, TRAPS) { |
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972 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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973 InstanceKlass::cast(klass)->initialize(CHECK); |
0 | 974 } |
975 | |
976 | |
977 // Creates the initial ThreadGroup | |
978 static Handle create_initial_thread_group(TRAPS) { | |
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979 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
0 | 980 instanceKlassHandle klass (THREAD, k); |
981 | |
982 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
983 { | |
984 JavaValue result(T_VOID); | |
985 JavaCalls::call_special(&result, | |
986 system_instance, | |
987 klass, | |
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988 vmSymbols::object_initializer_name(), |
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989 vmSymbols::void_method_signature(), |
0 | 990 CHECK_NH); |
991 } | |
992 Universe::set_system_thread_group(system_instance()); | |
993 | |
994 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
995 { | |
996 JavaValue result(T_VOID); | |
997 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
998 JavaCalls::call_special(&result, | |
999 main_instance, | |
1000 klass, | |
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1001 vmSymbols::object_initializer_name(), |
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1002 vmSymbols::threadgroup_string_void_signature(), |
0 | 1003 system_instance, |
1004 string, | |
1005 CHECK_NH); | |
1006 } | |
1007 return main_instance; | |
1008 } | |
1009 | |
1010 // Creates the initial Thread | |
1011 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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1012 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
0 | 1013 instanceKlassHandle klass (THREAD, k); |
1014 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
1015 | |
1016 java_lang_Thread::set_thread(thread_oop(), thread); | |
1017 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1018 thread->set_threadObj(thread_oop()); | |
1019 | |
1020 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
1021 | |
1022 JavaValue result(T_VOID); | |
1023 JavaCalls::call_special(&result, thread_oop, | |
1024 klass, | |
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1025 vmSymbols::object_initializer_name(), |
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1026 vmSymbols::threadgroup_string_void_signature(), |
0 | 1027 thread_group, |
1028 string, | |
1029 CHECK_NULL); | |
1030 return thread_oop(); | |
1031 } | |
1032 | |
1033 static void call_initializeSystemClass(TRAPS) { | |
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1034 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1035 instanceKlassHandle klass (THREAD, k); |
1036 | |
1037 JavaValue result(T_VOID); | |
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1038 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1039 vmSymbols::void_method_signature(), CHECK); |
0 | 1040 } |
1041 | |
6181 | 1042 char java_runtime_name[128] = ""; |
1043 | |
1044 // extract the JRE name from sun.misc.Version.java_runtime_name | |
1045 static const char* get_java_runtime_name(TRAPS) { | |
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1046 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
6181 | 1047 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
1048 fieldDescriptor fd; | |
1049 bool found = k != NULL && | |
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1050 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
6181 | 1051 vmSymbols::string_signature(), &fd); |
1052 if (found) { | |
1053 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
1054 if (name_oop == NULL) | |
1055 return NULL; | |
1056 const char* name = java_lang_String::as_utf8_string(name_oop, | |
1057 java_runtime_name, | |
1058 sizeof(java_runtime_name)); | |
1059 return name; | |
1060 } else { | |
1061 return NULL; | |
1062 } | |
1063 } | |
1064 | |
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1065 // General purpose hook into Java code, run once when the VM is initialized. |
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1066 // The Java library method itself may be changed independently from the VM. |
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1067 static void call_postVMInitHook(TRAPS) { |
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1068 Klass* k = SystemDictionary::PostVMInitHook_klass(); |
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1069 instanceKlassHandle klass (THREAD, k); |
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1070 if (klass.not_null()) { |
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1071 JavaValue result(T_VOID); |
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1072 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1073 vmSymbols::void_method_signature(), |
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1074 CHECK); |
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1075 } |
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1076 } |
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1077 |
0 | 1078 static void reset_vm_info_property(TRAPS) { |
1079 // the vm info string | |
1080 ResourceMark rm(THREAD); | |
1081 const char *vm_info = VM_Version::vm_info_string(); | |
1082 | |
1083 // java.lang.System class | |
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1084 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1085 instanceKlassHandle klass (THREAD, k); |
1086 | |
1087 // setProperty arguments | |
1088 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
1089 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
1090 | |
1091 // return value | |
1092 JavaValue r(T_OBJECT); | |
1093 | |
1094 // public static String setProperty(String key, String value); | |
1095 JavaCalls::call_static(&r, | |
1096 klass, | |
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1097 vmSymbols::setProperty_name(), |
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1098 vmSymbols::string_string_string_signature(), |
0 | 1099 key_str, |
1100 value_str, | |
1101 CHECK); | |
1102 } | |
1103 | |
1104 | |
1105 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
1106 assert(thread_group.not_null(), "thread group should be specified"); | |
1107 assert(threadObj() == NULL, "should only create Java thread object once"); | |
1108 | |
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1109 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 1110 instanceKlassHandle klass (THREAD, k); |
1111 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
1112 | |
1113 java_lang_Thread::set_thread(thread_oop(), this); | |
1114 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1115 set_threadObj(thread_oop()); | |
1116 | |
1117 JavaValue result(T_VOID); | |
1118 if (thread_name != NULL) { | |
1119 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
1120 // Thread gets assigned specified name and null target | |
1121 JavaCalls::call_special(&result, | |
1122 thread_oop, | |
1123 klass, | |
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1124 vmSymbols::object_initializer_name(), |
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1125 vmSymbols::threadgroup_string_void_signature(), |
0 | 1126 thread_group, // Argument 1 |
1127 name, // Argument 2 | |
1128 THREAD); | |
1129 } else { | |
1130 // Thread gets assigned name "Thread-nnn" and null target | |
1131 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
1132 JavaCalls::call_special(&result, | |
1133 thread_oop, | |
1134 klass, | |
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1135 vmSymbols::object_initializer_name(), |
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1136 vmSymbols::threadgroup_runnable_void_signature(), |
0 | 1137 thread_group, // Argument 1 |
1138 Handle(), // Argument 2 | |
1139 THREAD); | |
1140 } | |
1141 | |
1142 | |
1143 if (daemon) { | |
1144 java_lang_Thread::set_daemon(thread_oop()); | |
1145 } | |
1146 | |
1147 if (HAS_PENDING_EXCEPTION) { | |
1148 return; | |
1149 } | |
1150 | |
1142 | 1151 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
0 | 1152 Handle threadObj(this, this->threadObj()); |
1153 | |
1154 JavaCalls::call_special(&result, | |
1155 thread_group, | |
1156 group, | |
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1157 vmSymbols::add_method_name(), |
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1158 vmSymbols::thread_void_signature(), |
0 | 1159 threadObj, // Arg 1 |
1160 THREAD); | |
1161 | |
1162 | |
1163 } | |
1164 | |
1165 // NamedThread -- non-JavaThread subclasses with multiple | |
1166 // uniquely named instances should derive from this. | |
1167 NamedThread::NamedThread() : Thread() { | |
1168 _name = NULL; | |
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1169 _processed_thread = NULL; |
0 | 1170 } |
1171 | |
1172 NamedThread::~NamedThread() { | |
1173 if (_name != NULL) { | |
6197 | 1174 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
0 | 1175 _name = NULL; |
1176 } | |
1177 } | |
1178 | |
1179 void NamedThread::set_name(const char* format, ...) { | |
1180 guarantee(_name == NULL, "Only get to set name once."); | |
6197 | 1181 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
0 | 1182 guarantee(_name != NULL, "alloc failure"); |
1183 va_list ap; | |
1184 va_start(ap, format); | |
1185 jio_vsnprintf(_name, max_name_len, format, ap); | |
1186 va_end(ap); | |
1187 } | |
1188 | |
1189 // ======= WatcherThread ======== | |
1190 | |
1191 // The watcher thread exists to simulate timer interrupts. It should | |
1192 // be replaced by an abstraction over whatever native support for | |
1193 // timer interrupts exists on the platform. | |
1194 | |
1195 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
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1196 volatile bool WatcherThread::_should_terminate = false; |
0 | 1197 |
1198 WatcherThread::WatcherThread() : Thread() { | |
1199 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
1200 if (os::create_thread(this, os::watcher_thread)) { | |
1201 _watcher_thread = this; | |
1202 | |
1203 // Set the watcher thread to the highest OS priority which should not be | |
1204 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1205 // is created. The only normal thread using this priority is the reference | |
1206 // handler thread, which runs for very short intervals only. | |
1207 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1208 // will be inaccurate. | |
1209 os::set_priority(this, MaxPriority); | |
1210 if (!DisableStartThread) { | |
1211 os::start_thread(this); | |
1212 } | |
1213 } | |
1214 } | |
1215 | |
1216 void WatcherThread::run() { | |
1217 assert(this == watcher_thread(), "just checking"); | |
1218 | |
1219 this->record_stack_base_and_size(); | |
1220 this->initialize_thread_local_storage(); | |
1221 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1222 while(!_should_terminate) { | |
1223 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1224 assert(watcher_thread() == this, "thread consistency check"); | |
1225 | |
1226 // Calculate how long it'll be until the next PeriodicTask work | |
1227 // should be done, and sleep that amount of time. | |
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1228 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1229 |
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1230 // we expect this to timeout - we only ever get unparked when |
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1231 // we should terminate |
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1232 { |
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1233 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1234 |
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1235 jlong prev_time = os::javaTimeNanos(); |
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1236 for (;;) { |
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1237 int res= _SleepEvent->park(time_to_wait); |
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1238 if (res == OS_TIMEOUT || _should_terminate) |
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1239 break; |
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1240 // spurious wakeup of some kind |
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1241 jlong now = os::javaTimeNanos(); |
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1242 time_to_wait -= (now - prev_time) / 1000000; |
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1243 if (time_to_wait <= 0) |
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1244 break; |
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1245 prev_time = now; |
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1246 } |
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1247 } |
0 | 1248 |
1249 if (is_error_reported()) { | |
1250 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1251 // should abort JVM after creating an error log file. However in some | |
1252 // rare cases, the error handler itself might deadlock. Here we try to | |
1253 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1254 // | |
1255 // This code is in WatcherThread because WatcherThread wakes up | |
1256 // periodically so the fatal error handler doesn't need to do anything; | |
1257 // also because the WatcherThread is less likely to crash than other | |
1258 // threads. | |
1259 | |
1260 for (;;) { | |
1261 if (!ShowMessageBoxOnError | |
1262 && (OnError == NULL || OnError[0] == '\0') | |
1263 && Arguments::abort_hook() == NULL) { | |
1264 os::sleep(this, 2 * 60 * 1000, false); | |
1265 fdStream err(defaultStream::output_fd()); | |
1266 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1267 // skip atexit/vm_exit/vm_abort hooks | |
1268 os::die(); | |
1269 } | |
1270 | |
1271 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1272 // ShowMessageBoxOnError when it is ready to abort. | |
1273 os::sleep(this, 5 * 1000, false); | |
1274 } | |
1275 } | |
1276 | |
1277 PeriodicTask::real_time_tick(time_to_wait); | |
1278 | |
1279 // If we have no more tasks left due to dynamic disenrollment, | |
1280 // shut down the thread since we don't currently support dynamic enrollment | |
1281 if (PeriodicTask::num_tasks() == 0) { | |
1282 _should_terminate = true; | |
1283 } | |
1284 } | |
1285 | |
1286 // Signal that it is terminated | |
1287 { | |
1288 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1289 _watcher_thread = NULL; | |
1290 Terminator_lock->notify(); | |
1291 } | |
1292 | |
1293 // Thread destructor usually does this.. | |
1294 ThreadLocalStorage::set_thread(NULL); | |
1295 } | |
1296 | |
1297 void WatcherThread::start() { | |
1298 if (watcher_thread() == NULL) { | |
1299 _should_terminate = false; | |
1300 // Create the single instance of WatcherThread | |
1301 new WatcherThread(); | |
1302 } | |
1303 } | |
1304 | |
1305 void WatcherThread::stop() { | |
1306 // it is ok to take late safepoints here, if needed | |
1307 MutexLocker mu(Terminator_lock); | |
1308 _should_terminate = true; | |
1681
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1309 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1310 |
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1311 Thread* watcher = watcher_thread(); |
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1312 if (watcher != NULL) |
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1313 watcher->_SleepEvent->unpark(); |
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1314 |
0 | 1315 while(watcher_thread() != NULL) { |
1316 // This wait should make safepoint checks, wait without a timeout, | |
1317 // and wait as a suspend-equivalent condition. | |
1318 // | |
1319 // Note: If the FlatProfiler is running, then this thread is waiting | |
1320 // for the WatcherThread to terminate and the WatcherThread, via the | |
1321 // FlatProfiler task, is waiting for the external suspend request on | |
1322 // this thread to complete. wait_for_ext_suspend_completion() will | |
1323 // eventually timeout, but that takes time. Making this wait a | |
1324 // suspend-equivalent condition solves that timeout problem. | |
1325 // | |
1326 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1327 Mutex::_as_suspend_equivalent_flag); | |
1328 } | |
1329 } | |
1330 | |
1331 void WatcherThread::print_on(outputStream* st) const { | |
1332 st->print("\"%s\" ", name()); | |
1333 Thread::print_on(st); | |
1334 st->cr(); | |
1335 } | |
1336 | |
1337 // ======= JavaThread ======== | |
1338 | |
1339 // A JavaThread is a normal Java thread | |
1340 | |
1341 void JavaThread::initialize() { | |
1342 // Initialize fields | |
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1343 |
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1344 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1345 set_claimed_par_id(-1); |
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1346 |
0 | 1347 set_saved_exception_pc(NULL); |
1348 set_threadObj(NULL); | |
1349 _anchor.clear(); | |
1350 set_entry_point(NULL); | |
1351 set_jni_functions(jni_functions()); | |
1352 set_callee_target(NULL); | |
1353 set_vm_result(NULL); | |
1354 set_vm_result_2(NULL); | |
1355 set_vframe_array_head(NULL); | |
1356 set_vframe_array_last(NULL); | |
1357 set_deferred_locals(NULL); | |
1358 set_deopt_mark(NULL); | |
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1359 set_deopt_nmethod(NULL); |
0 | 1360 clear_must_deopt_id(); |
1361 set_monitor_chunks(NULL); | |
1362 set_next(NULL); | |
1363 set_thread_state(_thread_new); | |
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1364 #if INCLUDE_NMT |
6197 | 1365 set_recorder(NULL); |
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1366 #endif |
0 | 1367 _terminated = _not_terminated; |
1368 _privileged_stack_top = NULL; | |
1369 _array_for_gc = NULL; | |
1370 _suspend_equivalent = false; | |
1371 _in_deopt_handler = 0; | |
1372 _doing_unsafe_access = false; | |
1373 _stack_guard_state = stack_guard_unused; | |
1374 _exception_oop = NULL; | |
1375 _exception_pc = 0; | |
1376 _exception_handler_pc = 0; | |
1903 | 1377 _is_method_handle_return = 0; |
0 | 1378 _jvmti_thread_state= NULL; |
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1379 _should_post_on_exceptions_flag = JNI_FALSE; |
0 | 1380 _jvmti_get_loaded_classes_closure = NULL; |
1381 _interp_only_mode = 0; | |
1382 _special_runtime_exit_condition = _no_async_condition; | |
1383 _pending_async_exception = NULL; | |
1384 _is_compiling = false; | |
1385 _thread_stat = NULL; | |
1386 _thread_stat = new ThreadStatistics(); | |
1387 _blocked_on_compilation = false; | |
1388 _jni_active_critical = 0; | |
1389 _do_not_unlock_if_synchronized = false; | |
1390 _cached_monitor_info = NULL; | |
1391 _parker = Parker::Allocate(this) ; | |
1392 | |
1393 #ifndef PRODUCT | |
1394 _jmp_ring_index = 0; | |
1395 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1396 record_jump(NULL, NULL, NULL, 0); | |
1397 } | |
1398 #endif /* PRODUCT */ | |
1399 | |
1400 set_thread_profiler(NULL); | |
1401 if (FlatProfiler::is_active()) { | |
1402 // This is where we would decide to either give each thread it's own profiler | |
1403 // or use one global one from FlatProfiler, | |
1404 // or up to some count of the number of profiled threads, etc. | |
1405 ThreadProfiler* pp = new ThreadProfiler(); | |
1406 pp->engage(); | |
1407 set_thread_profiler(pp); | |
1408 } | |
1409 | |
1410 // Setup safepoint state info for this thread | |
1411 ThreadSafepointState::create(this); | |
1412 | |
1413 debug_only(_java_call_counter = 0); | |
1414 | |
1415 // JVMTI PopFrame support | |
1416 _popframe_condition = popframe_inactive; | |
1417 _popframe_preserved_args = NULL; | |
1418 _popframe_preserved_args_size = 0; | |
1419 | |
1420 pd_initialize(); | |
1421 } | |
1422 | |
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1423 #ifndef SERIALGC |
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1424 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1425 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1426 #endif // !SERIALGC |
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1427 |
4006 | 1428 JavaThread::JavaThread(bool is_attaching_via_jni) : |
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1429 Thread() |
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1430 #ifndef SERIALGC |
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1431 , _satb_mark_queue(&_satb_mark_queue_set), |
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1432 _dirty_card_queue(&_dirty_card_queue_set) |
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1433 #endif // !SERIALGC |
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1434 { |
0 | 1435 initialize(); |
4006 | 1436 if (is_attaching_via_jni) { |
1437 _jni_attach_state = _attaching_via_jni; | |
1438 } else { | |
1439 _jni_attach_state = _not_attaching_via_jni; | |
1440 } | |
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1441 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
6197 | 1442 _safepoint_visible = false; |
0 | 1443 } |
1444 | |
1445 bool JavaThread::reguard_stack(address cur_sp) { | |
1446 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1447 return true; // Stack already guarded or guard pages not needed. | |
1448 } | |
1449 | |
1450 if (register_stack_overflow()) { | |
1451 // For those architectures which have separate register and | |
1452 // memory stacks, we must check the register stack to see if | |
1453 // it has overflowed. | |
1454 return false; | |
1455 } | |
1456 | |
1457 // Java code never executes within the yellow zone: the latter is only | |
1458 // there to provoke an exception during stack banging. If java code | |
1459 // is executing there, either StackShadowPages should be larger, or | |
1460 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1461 // when it should. | |
1462 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1463 | |
1464 enable_stack_yellow_zone(); | |
1465 return true; | |
1466 } | |
1467 | |
1468 bool JavaThread::reguard_stack(void) { | |
1469 return reguard_stack(os::current_stack_pointer()); | |
1470 } | |
1471 | |
1472 | |
1473 void JavaThread::block_if_vm_exited() { | |
1474 if (_terminated == _vm_exited) { | |
1475 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1476 // we will block here forever | |
1477 Threads_lock->lock_without_safepoint_check(); | |
1478 ShouldNotReachHere(); | |
1479 } | |
1480 } | |
1481 | |
1482 | |
1483 // Remove this ifdef when C1 is ported to the compiler interface. | |
1484 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1485 | |
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1486 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1487 Thread() |
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1488 #ifndef SERIALGC |
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1489 , _satb_mark_queue(&_satb_mark_queue_set), |
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1490 _dirty_card_queue(&_dirty_card_queue_set) |
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1491 #endif // !SERIALGC |
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1492 { |
0 | 1493 if (TraceThreadEvents) { |
1494 tty->print_cr("creating thread %p", this); | |
1495 } | |
1496 initialize(); | |
4006 | 1497 _jni_attach_state = _not_attaching_via_jni; |
0 | 1498 set_entry_point(entry_point); |
1499 // Create the native thread itself. | |
1500 // %note runtime_23 | |
1501 os::ThreadType thr_type = os::java_thread; | |
1502 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1503 os::java_thread; | |
1504 os::create_thread(this, thr_type, stack_sz); | |
6197 | 1505 _safepoint_visible = false; |
0 | 1506 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
1507 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1508 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1509 // the exception consists of creating the exception object & initializing it, initialization | |
1510 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1511 // | |
1512 // The thread is still suspended when we reach here. Thread must be explicit started | |
1513 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1514 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1515 // object must be fully initialized (take a look at JVM_Start) | |
1516 } | |
1517 | |
1518 JavaThread::~JavaThread() { | |
1519 if (TraceThreadEvents) { | |
1520 tty->print_cr("terminate thread %p", this); | |
1521 } | |
1522 | |
6197 | 1523 // Info NMT that this JavaThread is exiting, its memory |
1524 // recorder should be collected | |
1525 assert(!is_safepoint_visible(), "wrong state"); | |
1526 MemTracker::thread_exiting(this); | |
1527 | |
0 | 1528 // JSR166 -- return the parker to the free list |
1529 Parker::Release(_parker); | |
1530 _parker = NULL ; | |
1531 | |
1532 // Free any remaining previous UnrollBlock | |
1533 vframeArray* old_array = vframe_array_last(); | |
1534 | |
1535 if (old_array != NULL) { | |
1536 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1537 old_array->set_unroll_block(NULL); | |
1538 delete old_info; | |
1539 delete old_array; | |
1540 } | |
1541 | |
1542 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1543 if (deferred != NULL) { | |
1544 // This can only happen if thread is destroyed before deoptimization occurs. | |
1545 assert(deferred->length() != 0, "empty array!"); | |
1546 do { | |
1547 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1548 deferred->remove_at(0); | |
1549 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1550 delete dlv; | |
1551 } while (deferred->length() != 0); | |
1552 delete deferred; | |
1553 } | |
1554 | |
1555 // All Java related clean up happens in exit | |
1556 ThreadSafepointState::destroy(this); | |
1557 if (_thread_profiler != NULL) delete _thread_profiler; | |
1558 if (_thread_stat != NULL) delete _thread_stat; | |
1559 } | |
1560 | |
1561 | |
1562 // The first routine called by a new Java thread | |
1563 void JavaThread::run() { | |
1564 // initialize thread-local alloc buffer related fields | |
1565 this->initialize_tlab(); | |
1566 | |
1567 // used to test validitity of stack trace backs | |
1568 this->record_base_of_stack_pointer(); | |
1569 | |
1570 // Record real stack base and size. | |
1571 this->record_stack_base_and_size(); | |
1572 | |
1573 // Initialize thread local storage; set before calling MutexLocker | |
1574 this->initialize_thread_local_storage(); | |
1575 | |
1576 this->create_stack_guard_pages(); | |
1577 | |
1681
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1578 this->cache_global_variables(); |
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1579 |
0 | 1580 // Thread is now sufficient initialized to be handled by the safepoint code as being |
1581 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1582 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1583 | |
1584 assert(JavaThread::current() == this, "sanity check"); | |
1585 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1586 | |
1587 DTRACE_THREAD_PROBE(start, this); | |
1588 | |
1589 // This operation might block. We call that after all safepoint checks for a new thread has | |
1590 // been completed. | |
1591 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1592 | |
1593 if (JvmtiExport::should_post_thread_life()) { | |
1594 JvmtiExport::post_thread_start(this); | |
1595 } | |
1596 | |
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1597 EVENT_BEGIN(TraceEventThreadStart, event); |
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1598 EVENT_COMMIT(event, |
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1599 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1600 |
0 | 1601 // We call another function to do the rest so we are sure that the stack addresses used |
1602 // from there will be lower than the stack base just computed | |
1603 thread_main_inner(); | |
1604 | |
1605 // Note, thread is no longer valid at this point! | |
1606 } | |
1607 | |
1608 | |
1609 void JavaThread::thread_main_inner() { | |
1610 assert(JavaThread::current() == this, "sanity check"); | |
1611 assert(this->threadObj() != NULL, "just checking"); | |
1612 | |
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1613 // Execute thread entry point unless this thread has a pending exception |
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1614 // or has been stopped before starting. |
0 | 1615 // Note: Due to JVM_StopThread we can have pending exceptions already! |
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1616 if (!this->has_pending_exception() && |
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1617 !java_lang_Thread::is_stillborn(this->threadObj())) { |
4006 | 1618 { |
1619 ResourceMark rm(this); | |
1620 this->set_native_thread_name(this->get_thread_name()); | |
1621 } | |
0 | 1622 HandleMark hm(this); |
1623 this->entry_point()(this, this); | |
1624 } | |
1625 | |
1626 DTRACE_THREAD_PROBE(stop, this); | |
1627 | |
1628 this->exit(false); | |
1629 delete this; | |
1630 } | |
1631 | |
1632 | |
1633 static void ensure_join(JavaThread* thread) { | |
1634 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1635 Handle threadObj(thread, thread->threadObj()); | |
1636 assert(threadObj.not_null(), "java thread object must exist"); | |
1637 ObjectLocker lock(threadObj, thread); | |
1638 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1639 thread->clear_pending_exception(); | |
1640 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1641 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
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1642 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1643 // to complete once we've done the notify_all below |
0 | 1644 java_lang_Thread::set_thread(threadObj(), NULL); |
1645 lock.notify_all(thread); | |
1646 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1647 thread->clear_pending_exception(); | |
1648 } | |
1649 | |
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1650 |
0 | 1651 // For any new cleanup additions, please check to see if they need to be applied to |
1652 // cleanup_failed_attach_current_thread as well. | |
1653 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
1654 assert(this == JavaThread::current(), "thread consistency check"); | |
1655 if (!InitializeJavaLangSystem) return; | |
1656 | |
1657 HandleMark hm(this); | |
1658 Handle uncaught_exception(this, this->pending_exception()); | |
1659 this->clear_pending_exception(); | |
1660 Handle threadObj(this, this->threadObj()); | |
1661 assert(threadObj.not_null(), "Java thread object should be created"); | |
1662 | |
1663 if (get_thread_profiler() != NULL) { | |
1664 get_thread_profiler()->disengage(); | |
1665 ResourceMark rm; | |
1666 get_thread_profiler()->print(get_thread_name()); | |
1667 } | |
1668 | |
1669 | |
1670 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
1671 { | |
1672 EXCEPTION_MARK; | |
1673 | |
1674 CLEAR_PENDING_EXCEPTION; | |
1675 } | |
1676 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
1677 // has to be fixed by a runtime query method | |
1678 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
1679 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
1680 // java.lang.Thread.dispatchUncaughtException | |
1681 if (uncaught_exception.not_null()) { | |
1682 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
1683 { | |
1684 EXCEPTION_MARK; | |
1685 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
1686 // call it. Otherwise we have an older library without the JSR-166 changes, | |
1687 // so call ThreadGroup.uncaughtException() | |
1688 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
1689 CallInfo callinfo; | |
1142 | 1690 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1691 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
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1692 vmSymbols::dispatchUncaughtException_name(), |
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1693 vmSymbols::throwable_void_signature(), |
0 | 1694 KlassHandle(), false, false, THREAD); |
1695 CLEAR_PENDING_EXCEPTION; | |
1696 methodHandle method = callinfo.selected_method(); | |
1697 if (method.not_null()) { | |
1698 JavaValue result(T_VOID); | |
1699 JavaCalls::call_virtual(&result, | |
1700 threadObj, thread_klass, | |
2177
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1701 vmSymbols::dispatchUncaughtException_name(), |
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1702 vmSymbols::throwable_void_signature(), |
0 | 1703 uncaught_exception, |
1704 THREAD); | |
1705 } else { | |
1142 | 1706 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 1707 JavaValue result(T_VOID); |
1708 JavaCalls::call_virtual(&result, | |
1709 group, thread_group, | |
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1710 vmSymbols::uncaughtException_name(), |
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1711 vmSymbols::thread_throwable_void_signature(), |
0 | 1712 threadObj, // Arg 1 |
1713 uncaught_exception, // Arg 2 | |
1714 THREAD); | |
1715 } | |
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1716 if (HAS_PENDING_EXCEPTION) { |
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1717 ResourceMark rm(this); |
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1718 jio_fprintf(defaultStream::error_stream(), |
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1719 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1720 " in thread \"%s\"\n", |
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1721 Klass::cast(pending_exception()->klass())->external_name(), |
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1722 get_thread_name()); |
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1723 CLEAR_PENDING_EXCEPTION; |
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1724 } |
0 | 1725 } |
1726 } | |
1727 | |
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1728 // Called before the java thread exit since we want to read info |
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1729 // from java_lang_Thread object |
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1730 EVENT_BEGIN(TraceEventThreadEnd, event); |
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1731 EVENT_COMMIT(event, |
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1732 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1733 |
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1734 // Call after last event on thread |
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1735 EVENT_THREAD_EXIT(this); |
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1736 |
0 | 1737 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
1738 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1739 // is deprecated anyhow. | |
1740 { int count = 3; | |
1741 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
1742 EXCEPTION_MARK; | |
1743 JavaValue result(T_VOID); | |
1142 | 1744 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1745 JavaCalls::call_virtual(&result, |
1746 threadObj, thread_klass, | |
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1747 vmSymbols::exit_method_name(), |
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1748 vmSymbols::void_method_signature(), |
0 | 1749 THREAD); |
1750 CLEAR_PENDING_EXCEPTION; | |
1751 } | |
1752 } | |
1753 | |
1754 // notify JVMTI | |
1755 if (JvmtiExport::should_post_thread_life()) { | |
1756 JvmtiExport::post_thread_end(this); | |
1757 } | |
1758 | |
1759 // We have notified the agents that we are exiting, before we go on, | |
1760 // we must check for a pending external suspend request and honor it | |
1761 // in order to not surprise the thread that made the suspend request. | |
1762 while (true) { | |
1763 { | |
1764 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1765 if (!is_external_suspend()) { | |
1766 set_terminated(_thread_exiting); | |
1767 ThreadService::current_thread_exiting(this); | |
1768 break; | |
1769 } | |
1770 // Implied else: | |
1771 // Things get a little tricky here. We have a pending external | |
1772 // suspend request, but we are holding the SR_lock so we | |
1773 // can't just self-suspend. So we temporarily drop the lock | |
1774 // and then self-suspend. | |
1775 } | |
1776 | |
1777 ThreadBlockInVM tbivm(this); | |
1778 java_suspend_self(); | |
1779 | |
1780 // We're done with this suspend request, but we have to loop around | |
1781 // and check again. Eventually we will get SR_lock without a pending | |
1782 // external suspend request and will be able to mark ourselves as | |
1783 // exiting. | |
1784 } | |
1785 // no more external suspends are allowed at this point | |
1786 } else { | |
1787 // before_exit() has already posted JVMTI THREAD_END events | |
1788 } | |
1789 | |
1790 // Notify waiters on thread object. This has to be done after exit() is called | |
1791 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1792 // group should have the destroyed bit set before waiters are notified). | |
1793 ensure_join(this); | |
1794 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1795 | |
1796 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1797 // held by this thread must be released. A detach operation must only | |
1798 // get here if there are no Java frames on the stack. Therefore, any | |
1799 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1800 // pre-inflated and in the monitor cache. | |
1801 // | |
1802 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1803 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1804 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1805 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1806 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1807 } | |
1808 | |
1809 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1810 // is in a consistent state, in case GC happens | |
1811 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1812 | |
1813 if (active_handles() != NULL) { | |
1814 JNIHandleBlock* block = active_handles(); | |
1815 set_active_handles(NULL); | |
1816 JNIHandleBlock::release_block(block); | |
1817 } | |
1818 | |
1819 if (free_handle_block() != NULL) { | |
1820 JNIHandleBlock* block = free_handle_block(); | |
1821 set_free_handle_block(NULL); | |
1822 JNIHandleBlock::release_block(block); | |
1823 } | |
1824 | |
1825 // These have to be removed while this is still a valid thread. | |
1826 remove_stack_guard_pages(); | |
1827 | |
1828 if (UseTLAB) { | |
1829 tlab().make_parsable(true); // retire TLAB | |
1830 } | |
1831 | |
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1832 if (JvmtiEnv::environments_might_exist()) { |
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1833 JvmtiExport::cleanup_thread(this); |
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1834 } |
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1835 |
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1836 #ifndef SERIALGC |
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1837 // We must flush G1-related buffers before removing a thread from |
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1838 // the list of active threads. |
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1839 if (UseG1GC) { |
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1840 flush_barrier_queues(); |
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1841 } |
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1842 #endif |
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1843 |
0 | 1844 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1845 Threads::remove(this); | |
1846 } | |
1847 | |
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1848 #ifndef SERIALGC |
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1849 // Flush G1-related queues. |
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1850 void JavaThread::flush_barrier_queues() { |
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1851 satb_mark_queue().flush(); |
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1852 dirty_card_queue().flush(); |
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1853 } |
1842
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1854 |
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1855 void JavaThread::initialize_queues() { |
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1856 assert(!SafepointSynchronize::is_at_safepoint(), |
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1857 "we should not be at a safepoint"); |
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1858 |
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1859 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1860 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1861 // The SATB queue should have been constructed with its active |
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1862 // field set to false. |
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1863 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1864 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1865 // If we are creating the thread during a marking cycle, we should |
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1866 // set the active field of the SATB queue to true. |
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1867 if (satb_queue_set.is_active()) { |
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1868 satb_queue.set_active(true); |
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1869 } |
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1870 |
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1871 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1872 // The dirty card queue should have been constructed with its |
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1873 // active field set to true. |
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1874 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1875 } |
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1876 #endif // !SERIALGC |
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1877 |
0 | 1878 void JavaThread::cleanup_failed_attach_current_thread() { |
441
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1879 if (get_thread_profiler() != NULL) { |
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1880 get_thread_profiler()->disengage(); |
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1881 ResourceMark rm; |
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1882 get_thread_profiler()->print(get_thread_name()); |
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1883 } |
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1884 |
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1885 if (active_handles() != NULL) { |
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1886 JNIHandleBlock* block = active_handles(); |
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1887 set_active_handles(NULL); |
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1888 JNIHandleBlock::release_block(block); |
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1889 } |
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1890 |
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1891 if (free_handle_block() != NULL) { |
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1892 JNIHandleBlock* block = free_handle_block(); |
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1893 set_free_handle_block(NULL); |
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1894 JNIHandleBlock::release_block(block); |
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1895 } |
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1896 |
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1897 // These have to be removed while this is still a valid thread. |
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1898 remove_stack_guard_pages(); |
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1899 |
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1900 if (UseTLAB) { |
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1901 tlab().make_parsable(true); // retire TLAB, if any |
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1902 } |
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1903 |
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1904 #ifndef SERIALGC |
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1905 if (UseG1GC) { |
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1906 flush_barrier_queues(); |
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1907 } |
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1908 #endif |
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1909 |
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1910 Threads::remove(this); |
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1911 delete this; |
0 | 1912 } |
1913 | |
1914 | |
441
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1915 |
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1916 |
0 | 1917 JavaThread* JavaThread::active() { |
1918 Thread* thread = ThreadLocalStorage::thread(); | |
1919 assert(thread != NULL, "just checking"); | |
1920 if (thread->is_Java_thread()) { | |
1921 return (JavaThread*) thread; | |
1922 } else { | |
1923 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
1924 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
1925 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
1926 assert(ret->is_Java_thread(), "must be a Java thread"); | |
1927 return ret; | |
1928 } | |
1929 } | |
1930 | |
1931 bool JavaThread::is_lock_owned(address adr) const { | |
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1932 if (Thread::is_lock_owned(adr)) return true; |
0 | 1933 |
1934 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
1935 if (chunk->contains(adr)) return true; | |
1936 } | |
1937 | |
1938 return false; | |
1939 } | |
1940 | |
1941 | |
1942 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
1943 chunk->set_next(monitor_chunks()); | |
1944 set_monitor_chunks(chunk); | |
1945 } | |
1946 | |
1947 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
1948 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
1949 if (monitor_chunks() == chunk) { | |
1950 set_monitor_chunks(chunk->next()); | |
1951 } else { | |
1952 MonitorChunk* prev = monitor_chunks(); | |
1953 while (prev->next() != chunk) prev = prev->next(); | |
1954 prev->set_next(chunk->next()); | |
1955 } | |
1956 } | |
1957 | |
1958 // JVM support. | |
1959 | |
1960 // Note: this function shouldn't block if it's called in | |
1961 // _thread_in_native_trans state (such as from | |
1962 // check_special_condition_for_native_trans()). | |
1963 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
1964 | |
1965 if (has_last_Java_frame() && has_async_condition()) { | |
1966 // If we are at a polling page safepoint (not a poll return) | |
1967 // then we must defer async exception because live registers | |
1968 // will be clobbered by the exception path. Poll return is | |
1969 // ok because the call we a returning from already collides | |
1970 // with exception handling registers and so there is no issue. | |
1971 // (The exception handling path kills call result registers but | |
1972 // this is ok since the exception kills the result anyway). | |
1973 | |
1974 if (is_at_poll_safepoint()) { | |
1975 // if the code we are returning to has deoptimized we must defer | |
1976 // the exception otherwise live registers get clobbered on the | |
1977 // exception path before deoptimization is able to retrieve them. | |
1978 // | |
1979 RegisterMap map(this, false); | |
1980 frame caller_fr = last_frame().sender(&map); | |
1981 assert(caller_fr.is_compiled_frame(), "what?"); | |
1982 if (caller_fr.is_deoptimized_frame()) { | |
1983 if (TraceExceptions) { | |
1984 ResourceMark rm; | |
1985 tty->print_cr("deferred async exception at compiled safepoint"); | |
1986 } | |
1987 return; | |
1988 } | |
1989 } | |
1990 } | |
1991 | |
1992 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
1993 if (condition == _no_async_condition) { | |
1994 // Conditions have changed since has_special_runtime_exit_condition() | |
1995 // was called: | |
1996 // - if we were here only because of an external suspend request, | |
1997 // then that was taken care of above (or cancelled) so we are done | |
1998 // - if we were here because of another async request, then it has | |
1999 // been cleared between the has_special_runtime_exit_condition() | |
2000 // and now so again we are done | |
2001 return; | |
2002 } | |
2003 | |
2004 // Check for pending async. exception | |
2005 if (_pending_async_exception != NULL) { | |
2006 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1142 | 2007 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2008 |
2009 // We cannot call Exceptions::_throw(...) here because we cannot block | |
2010 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
2011 | |
2012 if (TraceExceptions) { | |
2013 ResourceMark rm; | |
2014 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
2015 if (has_last_Java_frame() ) { | |
2016 frame f = last_frame(); | |
2017 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
2018 } | |
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2019 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2020 } |
2021 _pending_async_exception = NULL; | |
2022 clear_has_async_exception(); | |
2023 } | |
2024 } | |
2025 | |
2026 if (check_unsafe_error && | |
2027 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
2028 condition = _no_async_condition; // done | |
2029 switch (thread_state()) { | |
2030 case _thread_in_vm: | |
2031 { | |
2032 JavaThread* THREAD = this; | |
2033 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2034 } | |
2035 case _thread_in_native: | |
2036 { | |
2037 ThreadInVMfromNative tiv(this); | |
2038 JavaThread* THREAD = this; | |
2039 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2040 } | |
2041 case _thread_in_Java: | |
2042 { | |
2043 ThreadInVMfromJava tiv(this); | |
2044 JavaThread* THREAD = this; | |
2045 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
2046 } | |
2047 default: | |
2048 ShouldNotReachHere(); | |
2049 } | |
2050 } | |
2051 | |
2052 assert(condition == _no_async_condition || has_pending_exception() || | |
2053 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
2054 "must have handled the async condition, if no exception"); | |
2055 } | |
2056 | |
2057 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
2058 // | |
2059 // Check for pending external suspend. Internal suspend requests do | |
2060 // not use handle_special_runtime_exit_condition(). | |
2061 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2062 // thread is not the current thread. In older versions of jdbx, jdbx | |
2063 // threads could call into the VM with another thread's JNIEnv so we | |
2064 // can be here operating on behalf of a suspended thread (4432884). | |
2065 bool do_self_suspend = is_external_suspend_with_lock(); | |
2066 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
2067 // | |
2068 // Because thread is external suspended the safepoint code will count | |
2069 // thread as at a safepoint. This can be odd because we can be here | |
2070 // as _thread_in_Java which would normally transition to _thread_blocked | |
2071 // at a safepoint. We would like to mark the thread as _thread_blocked | |
2072 // before calling java_suspend_self like all other callers of it but | |
2073 // we must then observe proper safepoint protocol. (We can't leave | |
2074 // _thread_blocked with a safepoint in progress). However we can be | |
2075 // here as _thread_in_native_trans so we can't use a normal transition | |
2076 // constructor/destructor pair because they assert on that type of | |
2077 // transition. We could do something like: | |
2078 // | |
2079 // JavaThreadState state = thread_state(); | |
2080 // set_thread_state(_thread_in_vm); | |
2081 // { | |
2082 // ThreadBlockInVM tbivm(this); | |
2083 // java_suspend_self() | |
2084 // } | |
2085 // set_thread_state(_thread_in_vm_trans); | |
2086 // if (safepoint) block; | |
2087 // set_thread_state(state); | |
2088 // | |
2089 // but that is pretty messy. Instead we just go with the way the | |
2090 // code has worked before and note that this is the only path to | |
2091 // java_suspend_self that doesn't put the thread in _thread_blocked | |
2092 // mode. | |
2093 | |
2094 frame_anchor()->make_walkable(this); | |
2095 java_suspend_self(); | |
2096 | |
2097 // We might be here for reasons in addition to the self-suspend request | |
2098 // so check for other async requests. | |
2099 } | |
2100 | |
2101 if (check_asyncs) { | |
2102 check_and_handle_async_exceptions(); | |
2103 } | |
2104 } | |
2105 | |
2106 void JavaThread::send_thread_stop(oop java_throwable) { | |
2107 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
2108 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
2109 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
2110 | |
2111 // Do not throw asynchronous exceptions against the compiler thread | |
2112 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
2113 if (is_Compiler_thread()) return; | |
2114 | |
2115 { | |
2116 // Actually throw the Throwable against the target Thread - however | |
2117 // only if there is no thread death exception installed already. | |
1142 | 2118 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2119 // If the topmost frame is a runtime stub, then we are calling into |
2120 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
2121 // must deoptimize the caller before continuing, as the compiled exception handler table | |
2122 // may not be valid | |
2123 if (has_last_Java_frame()) { | |
2124 frame f = last_frame(); | |
2125 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
2126 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2127 RegisterMap reg_map(this, UseBiasedLocking); | |
2128 frame compiled_frame = f.sender(®_map); | |
2129 if (compiled_frame.can_be_deoptimized()) { | |
2130 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
2131 } | |
2132 } | |
2133 } | |
2134 | |
2135 // Set async. pending exception in thread. | |
2136 set_pending_async_exception(java_throwable); | |
2137 | |
2138 if (TraceExceptions) { | |
2139 ResourceMark rm; | |
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2140 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2141 } |
2142 // for AbortVMOnException flag | |
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2143 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
0 | 2144 } |
2145 } | |
2146 | |
2147 | |
2148 // Interrupt thread so it will wake up from a potential wait() | |
2149 Thread::interrupt(this); | |
2150 } | |
2151 | |
2152 // External suspension mechanism. | |
2153 // | |
2154 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
2155 // to any VM_locks and it is at a transition | |
2156 // Self-suspension will happen on the transition out of the vm. | |
2157 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
2158 // | |
2159 // Guarantees on return: | |
2160 // + Target thread will not execute any new bytecode (that's why we need to | |
2161 // force a safepoint) | |
2162 // + Target thread will not enter any new monitors | |
2163 // | |
2164 void JavaThread::java_suspend() { | |
2165 { MutexLocker mu(Threads_lock); | |
2166 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
2167 return; | |
2168 } | |
2169 } | |
2170 | |
2171 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2172 if (!is_external_suspend()) { | |
2173 // a racing resume has cancelled us; bail out now | |
2174 return; | |
2175 } | |
2176 | |
2177 // suspend is done | |
2178 uint32_t debug_bits = 0; | |
2179 // Warning: is_ext_suspend_completed() may temporarily drop the | |
2180 // SR_lock to allow the thread to reach a stable thread state if | |
2181 // it is currently in a transient thread state. | |
2182 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
2183 SuspendRetryDelay, &debug_bits) ) { | |
2184 return; | |
2185 } | |
2186 } | |
2187 | |
2188 VM_ForceSafepoint vm_suspend; | |
2189 VMThread::execute(&vm_suspend); | |
2190 } | |
2191 | |
2192 // Part II of external suspension. | |
2193 // A JavaThread self suspends when it detects a pending external suspend | |
2194 // request. This is usually on transitions. It is also done in places | |
2195 // where continuing to the next transition would surprise the caller, | |
2196 // e.g., monitor entry. | |
2197 // | |
2198 // Returns the number of times that the thread self-suspended. | |
2199 // | |
2200 // Note: DO NOT call java_suspend_self() when you just want to block current | |
2201 // thread. java_suspend_self() is the second stage of cooperative | |
2202 // suspension for external suspend requests and should only be used | |
2203 // to complete an external suspend request. | |
2204 // | |
2205 int JavaThread::java_suspend_self() { | |
2206 int ret = 0; | |
2207 | |
2208 // we are in the process of exiting so don't suspend | |
2209 if (is_exiting()) { | |
2210 clear_external_suspend(); | |
2211 return ret; | |
2212 } | |
2213 | |
2214 assert(_anchor.walkable() || | |
2215 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
2216 "must have walkable stack"); | |
2217 | |
2218 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2219 | |
979 | 2220 assert(!this->is_ext_suspended(), |
0 | 2221 "a thread trying to self-suspend should not already be suspended"); |
2222 | |
2223 if (this->is_suspend_equivalent()) { | |
2224 // If we are self-suspending as a result of the lifting of a | |
2225 // suspend equivalent condition, then the suspend_equivalent | |
2226 // flag is not cleared until we set the ext_suspended flag so | |
2227 // that wait_for_ext_suspend_completion() returns consistent | |
2228 // results. | |
2229 this->clear_suspend_equivalent(); | |
2230 } | |
2231 | |
2232 // A racing resume may have cancelled us before we grabbed SR_lock | |
2233 // above. Or another external suspend request could be waiting for us | |
2234 // by the time we return from SR_lock()->wait(). The thread | |
2235 // that requested the suspension may already be trying to walk our | |
2236 // stack and if we return now, we can change the stack out from under | |
2237 // it. This would be a "bad thing (TM)" and cause the stack walker | |
2238 // to crash. We stay self-suspended until there are no more pending | |
2239 // external suspend requests. | |
2240 while (is_external_suspend()) { | |
2241 ret++; | |
2242 this->set_ext_suspended(); | |
2243 | |
2244 // _ext_suspended flag is cleared by java_resume() | |
2245 while (is_ext_suspended()) { | |
2246 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
2247 } | |
2248 } | |
2249 | |
2250 return ret; | |
2251 } | |
2252 | |
2253 #ifdef ASSERT | |
2254 // verify the JavaThread has not yet been published in the Threads::list, and | |
2255 // hence doesn't need protection from concurrent access at this stage | |
2256 void JavaThread::verify_not_published() { | |
2257 if (!Threads_lock->owned_by_self()) { | |
2258 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
2259 assert( !Threads::includes(this), | |
2260 "java thread shouldn't have been published yet!"); | |
2261 } | |
2262 else { | |
2263 assert( !Threads::includes(this), | |
2264 "java thread shouldn't have been published yet!"); | |
2265 } | |
2266 } | |
2267 #endif | |
2268 | |
2269 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2270 // progress or when _suspend_flags is non-zero. | |
2271 // Current thread needs to self-suspend if there is a suspend request and/or | |
2272 // block if a safepoint is in progress. | |
2273 // Async exception ISN'T checked. | |
2274 // Note only the ThreadInVMfromNative transition can call this function | |
2275 // directly and when thread state is _thread_in_native_trans | |
2276 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
2277 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
2278 | |
2279 JavaThread *curJT = JavaThread::current(); | |
2280 bool do_self_suspend = thread->is_external_suspend(); | |
2281 | |
2282 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
2283 | |
2284 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2285 // thread is not the current thread. In older versions of jdbx, jdbx | |
2286 // threads could call into the VM with another thread's JNIEnv so we | |
2287 // can be here operating on behalf of a suspended thread (4432884). | |
2288 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2289 JavaThreadState state = thread->thread_state(); | |
2290 | |
2291 // We mark this thread_blocked state as a suspend-equivalent so | |
2292 // that a caller to is_ext_suspend_completed() won't be confused. | |
2293 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2294 thread->set_suspend_equivalent(); | |
2295 | |
2296 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2297 // wait until the thread changes to other thread state. There is no | |
2298 // guarantee on how soon we can obtain the SR_lock and complete the | |
2299 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2300 // too long. Temporarily change the state to _thread_blocked to | |
2301 // let the VM thread know that this thread is ready for GC. The problem | |
2302 // of changing thread state is that safepoint could happen just after | |
2303 // java_suspend_self() returns after being resumed, and VM thread will | |
2304 // see the _thread_blocked state. We must check for safepoint | |
2305 // after restoring the state and make sure we won't leave while a safepoint | |
2306 // is in progress. | |
2307 thread->set_thread_state(_thread_blocked); | |
2308 thread->java_suspend_self(); | |
2309 thread->set_thread_state(state); | |
2310 // Make sure new state is seen by VM thread | |
2311 if (os::is_MP()) { | |
2312 if (UseMembar) { | |
2313 // Force a fence between the write above and read below | |
2314 OrderAccess::fence(); | |
2315 } else { | |
2316 // Must use this rather than serialization page in particular on Windows | |
2317 InterfaceSupport::serialize_memory(thread); | |
2318 } | |
2319 } | |
2320 } | |
2321 | |
2322 if (SafepointSynchronize::do_call_back()) { | |
2323 // If we are safepointing, then block the caller which may not be | |
2324 // the same as the target thread (see above). | |
2325 SafepointSynchronize::block(curJT); | |
2326 } | |
2327 | |
2328 if (thread->is_deopt_suspend()) { | |
2329 thread->clear_deopt_suspend(); | |
2330 RegisterMap map(thread, false); | |
2331 frame f = thread->last_frame(); | |
2332 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2333 f = f.sender(&map); | |
2334 } | |
2335 if (f.id() == thread->must_deopt_id()) { | |
2336 thread->clear_must_deopt_id(); | |
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2337 f.deoptimize(thread); |
0 | 2338 } else { |
2339 fatal("missed deoptimization!"); | |
2340 } | |
2341 } | |
2342 } | |
2343 | |
2344 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2345 // progress or when _suspend_flags is non-zero. | |
2346 // Current thread needs to self-suspend if there is a suspend request and/or | |
2347 // block if a safepoint is in progress. | |
2348 // Also check for pending async exception (not including unsafe access error). | |
2349 // Note only the native==>VM/Java barriers can call this function and when | |
2350 // thread state is _thread_in_native_trans. | |
2351 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2352 check_safepoint_and_suspend_for_native_trans(thread); | |
2353 | |
2354 if (thread->has_async_exception()) { | |
2355 // We are in _thread_in_native_trans state, don't handle unsafe | |
2356 // access error since that may block. | |
2357 thread->check_and_handle_async_exceptions(false); | |
2358 } | |
2359 } | |
2360 | |
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2361 // This is a variant of the normal |
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2362 // check_special_condition_for_native_trans with slightly different |
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2363 // semantics for use by critical native wrappers. It does all the |
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2364 // normal checks but also performs the transition back into |
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2365 // thread_in_Java state. This is required so that critical natives |
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2366 // can potentially block and perform a GC if they are the last thread |
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2367 // exiting the GC_locker. |
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2368 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
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2369 check_special_condition_for_native_trans(thread); |
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2370 |
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2371 // Finish the transition |
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2372 thread->set_thread_state(_thread_in_Java); |
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2373 |
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2374 if (thread->do_critical_native_unlock()) { |
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2375 ThreadInVMfromJavaNoAsyncException tiv(thread); |
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2376 GC_locker::unlock_critical(thread); |
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2377 thread->clear_critical_native_unlock(); |
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2378 } |
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2379 } |
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2380 |
0 | 2381 // We need to guarantee the Threads_lock here, since resumes are not |
2382 // allowed during safepoint synchronization | |
2383 // Can only resume from an external suspension | |
2384 void JavaThread::java_resume() { | |
2385 assert_locked_or_safepoint(Threads_lock); | |
2386 | |
2387 // Sanity check: thread is gone, has started exiting or the thread | |
2388 // was not externally suspended. | |
2389 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2390 return; | |
2391 } | |
2392 | |
2393 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2394 | |
2395 clear_external_suspend(); | |
2396 | |
2397 if (is_ext_suspended()) { | |
2398 clear_ext_suspended(); | |
2399 SR_lock()->notify_all(); | |
2400 } | |
2401 } | |
2402 | |
2403 void JavaThread::create_stack_guard_pages() { | |
2404 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2405 address low_addr = stack_base() - stack_size(); | |
2406 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2407 | |
2408 int allocate = os::allocate_stack_guard_pages(); | |
2409 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2410 | |
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2411 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
0 | 2412 warning("Attempt to allocate stack guard pages failed."); |
2413 return; | |
2414 } | |
2415 | |
2416 if (os::guard_memory((char *) low_addr, len)) { | |
2417 _stack_guard_state = stack_guard_enabled; | |
2418 } else { | |
2419 warning("Attempt to protect stack guard pages failed."); | |
2420 if (os::uncommit_memory((char *) low_addr, len)) { | |
2421 warning("Attempt to deallocate stack guard pages failed."); | |
2422 } | |
2423 } | |
2424 } | |
2425 | |
2426 void JavaThread::remove_stack_guard_pages() { | |
2427 if (_stack_guard_state == stack_guard_unused) return; | |
2428 address low_addr = stack_base() - stack_size(); | |
2429 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2430 | |
2431 if (os::allocate_stack_guard_pages()) { | |
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2432 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
0 | 2433 _stack_guard_state = stack_guard_unused; |
2434 } else { | |
2435 warning("Attempt to deallocate stack guard pages failed."); | |
2436 } | |
2437 } else { | |
2438 if (_stack_guard_state == stack_guard_unused) return; | |
2439 if (os::unguard_memory((char *) low_addr, len)) { | |
2440 _stack_guard_state = stack_guard_unused; | |
2441 } else { | |
2442 warning("Attempt to unprotect stack guard pages failed."); | |
2443 } | |
2444 } | |
2445 } | |
2446 | |
2447 void JavaThread::enable_stack_yellow_zone() { | |
2448 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2449 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2450 | |
2451 // The base notation is from the stacks point of view, growing downward. | |
2452 // We need to adjust it to work correctly with guard_memory() | |
2453 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2454 | |
2455 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2456 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2457 | |
2458 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2459 _stack_guard_state = stack_guard_enabled; | |
2460 } else { | |
2461 warning("Attempt to guard stack yellow zone failed."); | |
2462 } | |
2463 enable_register_stack_guard(); | |
2464 } | |
2465 | |
2466 void JavaThread::disable_stack_yellow_zone() { | |
2467 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2468 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2469 | |
2470 // Simply return if called for a thread that does not use guard pages. | |
2471 if (_stack_guard_state == stack_guard_unused) return; | |
2472 | |
2473 // The base notation is from the stacks point of view, growing downward. | |
2474 // We need to adjust it to work correctly with guard_memory() | |
2475 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2476 | |
2477 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2478 _stack_guard_state = stack_guard_yellow_disabled; | |
2479 } else { | |
2480 warning("Attempt to unguard stack yellow zone failed."); | |
2481 } | |
2482 disable_register_stack_guard(); | |
2483 } | |
2484 | |
2485 void JavaThread::enable_stack_red_zone() { | |
2486 // The base notation is from the stacks point of view, growing downward. | |
2487 // We need to adjust it to work correctly with guard_memory() | |
2488 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2489 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2490 | |
2491 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2492 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2493 | |
2494 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2495 warning("Attempt to guard stack red zone failed."); | |
2496 } | |
2497 } | |
2498 | |
2499 void JavaThread::disable_stack_red_zone() { | |
2500 // The base notation is from the stacks point of view, growing downward. | |
2501 // We need to adjust it to work correctly with guard_memory() | |
2502 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2503 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2504 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2505 warning("Attempt to unguard stack red zone failed."); | |
2506 } | |
2507 } | |
2508 | |
2509 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2510 // ignore is there is no stack | |
2511 if (!has_last_Java_frame()) return; | |
2512 // traverse the stack frames. Starts from top frame. | |
2513 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2514 frame* fr = fst.current(); | |
2515 f(fr, fst.register_map()); | |
2516 } | |
2517 } | |
2518 | |
2519 | |
2520 #ifndef PRODUCT | |
2521 // Deoptimization | |
2522 // Function for testing deoptimization | |
2523 void JavaThread::deoptimize() { | |
2524 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2525 StackFrameStream fst(this, UseBiasedLocking); | |
2526 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2527 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2528 // Iterate over all frames in the thread and deoptimize | |
2529 for(; !fst.is_done(); fst.next()) { | |
2530 if(fst.current()->can_be_deoptimized()) { | |
2531 | |
2532 if (only_at) { | |
2533 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2534 // consists of comma or carriage return separated numbers so | |
2535 // search for the current bci in that string. | |
2536 address pc = fst.current()->pc(); | |
2537 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2538 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2539 char buffer[8]; | |
2540 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2541 size_t len = strlen(buffer); | |
2542 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2543 while (found != NULL) { | |
2544 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2545 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2546 // Check that the bci found is bracketed by terminators. | |
2547 break; | |
2548 } | |
2549 found = strstr(found + 1, buffer); | |
2550 } | |
2551 if (!found) { | |
2552 continue; | |
2553 } | |
2554 } | |
2555 | |
2556 if (DebugDeoptimization && !deopt) { | |
2557 deopt = true; // One-time only print before deopt | |
2558 tty->print_cr("[BEFORE Deoptimization]"); | |
2559 trace_frames(); | |
2560 trace_stack(); | |
2561 } | |
2562 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2563 } | |
2564 } | |
2565 | |
2566 if (DebugDeoptimization && deopt) { | |
2567 tty->print_cr("[AFTER Deoptimization]"); | |
2568 trace_frames(); | |
2569 } | |
2570 } | |
2571 | |
2572 | |
2573 // Make zombies | |
2574 void JavaThread::make_zombies() { | |
2575 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2576 if (fst.current()->can_be_deoptimized()) { | |
2577 // it is a Java nmethod | |
2578 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2579 nm->make_not_entrant(); | |
2580 } | |
2581 } | |
2582 } | |
2583 #endif // PRODUCT | |
2584 | |
2585 | |
2586 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2587 if (!has_last_Java_frame()) return; | |
2588 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2589 StackFrameStream fst(this, UseBiasedLocking); | |
2590 for(; !fst.is_done(); fst.next()) { | |
2591 if (fst.current()->should_be_deoptimized()) { | |
6843 | 2592 if (LogCompilation && xtty != NULL) { |
2593 nmethod* nm = fst.current()->cb()->as_nmethod_or_null(); | |
2594 xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'", | |
2595 this->name(), nm != NULL ? nm->compile_id() : -1); | |
2596 } | |
2597 | |
0 | 2598 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); |
2599 } | |
2600 } | |
2601 } | |
2602 | |
2603 | |
2604 // GC support | |
2605 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2606 | |
2607 void JavaThread::gc_epilogue() { | |
2608 frames_do(frame_gc_epilogue); | |
2609 } | |
2610 | |
2611 | |
2612 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2613 | |
2614 void JavaThread::gc_prologue() { | |
2615 frames_do(frame_gc_prologue); | |
2616 } | |
2617 | |
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2618 // If the caller is a NamedThread, then remember, in the current scope, |
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2619 // the given JavaThread in its _processed_thread field. |
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2620 class RememberProcessedThread: public StackObj { |
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|
2621 NamedThread* _cur_thr; |
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2622 public: |
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2623 RememberProcessedThread(JavaThread* jthr) { |
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2624 Thread* thread = Thread::current(); |
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2625 if (thread->is_Named_thread()) { |
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2626 _cur_thr = (NamedThread *)thread; |
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2627 _cur_thr->set_processed_thread(jthr); |
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2628 } else { |
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2629 _cur_thr = NULL; |
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|
2630 } |
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2631 } |
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2632 |
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2633 ~RememberProcessedThread() { |
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|
2634 if (_cur_thr) { |
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2635 _cur_thr->set_processed_thread(NULL); |
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|
2636 } |
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|
2637 } |
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2638 }; |
0 | 2639 |
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|
2640 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
1166 | 2641 // Verify that the deferred card marks have been flushed. |
2642 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
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2643 |
0 | 2644 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
2645 // since there may be more than one thread using each ThreadProfiler. | |
2646 | |
2647 // Traverse the GCHandles | |
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|
2648 Thread::oops_do(f, cf); |
0 | 2649 |
2650 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2651 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2652 | |
2653 if (has_last_Java_frame()) { | |
1119
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2654 // Record JavaThread to GC thread |
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|
2655 RememberProcessedThread rpt(this); |
0 | 2656 |
2657 // Traverse the privileged stack | |
2658 if (_privileged_stack_top != NULL) { | |
2659 _privileged_stack_top->oops_do(f); | |
2660 } | |
2661 | |
2662 // traverse the registered growable array | |
2663 if (_array_for_gc != NULL) { | |
2664 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2665 f->do_oop(_array_for_gc->adr_at(index)); | |
2666 } | |
2667 } | |
2668 | |
2669 // Traverse the monitor chunks | |
2670 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2671 chunk->oops_do(f); | |
2672 } | |
2673 | |
2674 // Traverse the execution stack | |
2675 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2676 fst.current()->oops_do(f, cf, fst.register_map()); |
0 | 2677 } |
2678 } | |
2679 | |
2680 // callee_target is never live across a gc point so NULL it here should | |
2681 // it still contain a methdOop. | |
2682 | |
2683 set_callee_target(NULL); | |
2684 | |
2685 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2686 // If we have deferred set_locals there might be oops waiting to be | |
2687 // written | |
2688 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2689 if (list != NULL) { | |
2690 for (int i = 0; i < list->length(); i++) { | |
2691 list->at(i)->oops_do(f); | |
2692 } | |
2693 } | |
2694 | |
2695 // Traverse instance variables at the end since the GC may be moving things | |
2696 // around using this function | |
2697 f->do_oop((oop*) &_threadObj); | |
2698 f->do_oop((oop*) &_vm_result); | |
2699 f->do_oop((oop*) &_exception_oop); | |
2700 f->do_oop((oop*) &_pending_async_exception); | |
2701 | |
2702 if (jvmti_thread_state() != NULL) { | |
2703 jvmti_thread_state()->oops_do(f); | |
2704 } | |
2705 } | |
2706 | |
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2707 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
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2708 Thread::nmethods_do(cf); // (super method is a no-op) |
0 | 2709 |
2710 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2711 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2712 | |
2713 if (has_last_Java_frame()) { | |
2714 // Traverse the execution stack | |
2715 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2716 fst.current()->nmethods_do(cf); |
0 | 2717 } |
2718 } | |
2719 } | |
2720 | |
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2721 void JavaThread::metadata_do(void f(Metadata*)) { |
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2722 Thread::metadata_do(f); |
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2723 if (has_last_Java_frame()) { |
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2724 // Traverse the execution stack to call f() on the methods in the stack |
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2725 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
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2726 fst.current()->metadata_do(f); |
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2727 } |
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2728 } else if (is_Compiler_thread()) { |
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2729 // need to walk ciMetadata in current compile tasks to keep alive. |
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2730 CompilerThread* ct = (CompilerThread*)this; |
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2731 if (ct->env() != NULL) { |
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2732 ct->env()->metadata_do(f); |
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2733 } |
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2734 } |
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2735 } |
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2736 |
0 | 2737 // Printing |
2738 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2739 switch (_thread_state) { | |
2740 case _thread_uninitialized: return "_thread_uninitialized"; | |
2741 case _thread_new: return "_thread_new"; | |
2742 case _thread_new_trans: return "_thread_new_trans"; | |
2743 case _thread_in_native: return "_thread_in_native"; | |
2744 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2745 case _thread_in_vm: return "_thread_in_vm"; | |
2746 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2747 case _thread_in_Java: return "_thread_in_Java"; | |
2748 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2749 case _thread_blocked: return "_thread_blocked"; | |
2750 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2751 default: return "unknown thread state"; | |
2752 } | |
2753 } | |
2754 | |
2755 #ifndef PRODUCT | |
2756 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2757 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2758 }; | |
2759 void JavaThread::print_thread_state() const { | |
2760 print_thread_state_on(tty); | |
2761 }; | |
2762 #endif // PRODUCT | |
2763 | |
2764 // Called by Threads::print() for VM_PrintThreads operation | |
2765 void JavaThread::print_on(outputStream *st) const { | |
2766 st->print("\"%s\" ", get_thread_name()); | |
2767 oop thread_oop = threadObj(); | |
6766 | 2768 if (thread_oop != NULL) { |
2769 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); | |
2770 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2771 st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); | |
2772 } | |
0 | 2773 Thread::print_on(st); |
2774 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
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2775 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
0 | 2776 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
2777 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2778 } | |
2779 #ifndef PRODUCT | |
2780 print_thread_state_on(st); | |
2781 _safepoint_state->print_on(st); | |
2782 #endif // PRODUCT | |
2783 } | |
2784 | |
2785 // Called by fatal error handler. The difference between this and | |
2786 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2787 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2788 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2789 oop thread_obj = threadObj(); | |
2790 if (thread_obj != NULL) { | |
2791 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2792 } | |
2793 st->print(" ["); | |
2794 st->print("%s", _get_thread_state_name(_thread_state)); | |
2795 if (osthread()) { | |
2796 st->print(", id=%d", osthread()->thread_id()); | |
2797 } | |
2798 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2799 _stack_base - _stack_size, _stack_base); | |
2800 st->print("]"); | |
2801 return; | |
2802 } | |
2803 | |
2804 // Verification | |
2805 | |
2806 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2807 | |
2808 void JavaThread::verify() { | |
2809 // Verify oops in the thread. | |
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2810 oops_do(&VerifyOopClosure::verify_oop, NULL); |
0 | 2811 |
2812 // Verify the stack frames. | |
2813 frames_do(frame_verify); | |
2814 } | |
2815 | |
2816 // CR 6300358 (sub-CR 2137150) | |
2817 // Most callers of this method assume that it can't return NULL but a | |
2818 // thread may not have a name whilst it is in the process of attaching to | |
2819 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2820 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2821 // if vm exit occurs during initialization). These cases can all be accounted | |
2822 // for such that this method never returns NULL. | |
2823 const char* JavaThread::get_thread_name() const { | |
2824 #ifdef ASSERT | |
2825 // early safepoints can hit while current thread does not yet have TLS | |
2826 if (!SafepointSynchronize::is_at_safepoint()) { | |
2827 Thread *cur = Thread::current(); | |
2828 if (!(cur->is_Java_thread() && cur == this)) { | |
2829 // Current JavaThreads are allowed to get their own name without | |
2830 // the Threads_lock. | |
2831 assert_locked_or_safepoint(Threads_lock); | |
2832 } | |
2833 } | |
2834 #endif // ASSERT | |
2835 return get_thread_name_string(); | |
2836 } | |
2837 | |
2838 // Returns a non-NULL representation of this thread's name, or a suitable | |
2839 // descriptive string if there is no set name | |
2840 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2841 const char* name_str; | |
2842 oop thread_obj = threadObj(); | |
2843 if (thread_obj != NULL) { | |
2844 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2845 if (name != NULL) { | |
2846 if (buf == NULL) { | |
2847 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2848 } | |
2849 else { | |
2850 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2851 } | |
2852 } | |
4006 | 2853 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
0 | 2854 name_str = "<no-name - thread is attaching>"; |
2855 } | |
2856 else { | |
2857 name_str = Thread::name(); | |
2858 } | |
2859 } | |
2860 else { | |
2861 name_str = Thread::name(); | |
2862 } | |
2863 assert(name_str != NULL, "unexpected NULL thread name"); | |
2864 return name_str; | |
2865 } | |
2866 | |
2867 | |
2868 const char* JavaThread::get_threadgroup_name() const { | |
2869 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2870 oop thread_obj = threadObj(); | |
2871 if (thread_obj != NULL) { | |
2872 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2873 if (thread_group != NULL) { | |
2874 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
2875 // ThreadGroup.name can be null | |
2876 if (name != NULL) { | |
2877 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2878 return str; | |
2879 } | |
2880 } | |
2881 } | |
2882 return NULL; | |
2883 } | |
2884 | |
2885 const char* JavaThread::get_parent_name() const { | |
2886 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2887 oop thread_obj = threadObj(); | |
2888 if (thread_obj != NULL) { | |
2889 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2890 if (thread_group != NULL) { | |
2891 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
2892 if (parent != NULL) { | |
2893 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
2894 // ThreadGroup.name can be null | |
2895 if (name != NULL) { | |
2896 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2897 return str; | |
2898 } | |
2899 } | |
2900 } | |
2901 } | |
2902 return NULL; | |
2903 } | |
2904 | |
2905 ThreadPriority JavaThread::java_priority() const { | |
2906 oop thr_oop = threadObj(); | |
2907 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
2908 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
2909 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
2910 return priority; | |
2911 } | |
2912 | |
2913 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
2914 | |
2915 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
2916 // Link Java Thread object <-> C++ Thread | |
2917 | |
2918 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
2919 // and put it into a new Handle. The Handle "thread_oop" can then | |
2920 // be used to pass the C++ thread object to other methods. | |
2921 | |
2922 // Set the Java level thread object (jthread) field of the | |
2923 // new thread (a JavaThread *) to C++ thread object using the | |
2924 // "thread_oop" handle. | |
2925 | |
2926 // Set the thread field (a JavaThread *) of the | |
2927 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
2928 | |
2929 Handle thread_oop(Thread::current(), | |
2930 JNIHandles::resolve_non_null(jni_thread)); | |
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2931 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
0 | 2932 "must be initialized"); |
2933 set_threadObj(thread_oop()); | |
2934 java_lang_Thread::set_thread(thread_oop(), this); | |
2935 | |
2936 if (prio == NoPriority) { | |
2937 prio = java_lang_Thread::priority(thread_oop()); | |
2938 assert(prio != NoPriority, "A valid priority should be present"); | |
2939 } | |
2940 | |
2941 // Push the Java priority down to the native thread; needs Threads_lock | |
2942 Thread::set_priority(this, prio); | |
2943 | |
2944 // Add the new thread to the Threads list and set it in motion. | |
2945 // We must have threads lock in order to call Threads::add. | |
2946 // It is crucial that we do not block before the thread is | |
2947 // added to the Threads list for if a GC happens, then the java_thread oop | |
2948 // will not be visited by GC. | |
2949 Threads::add(this); | |
2950 } | |
2951 | |
2952 oop JavaThread::current_park_blocker() { | |
2953 // Support for JSR-166 locks | |
2954 oop thread_oop = threadObj(); | |
242 | 2955 if (thread_oop != NULL && |
2956 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 2957 return java_lang_Thread::park_blocker(thread_oop); |
2958 } | |
2959 return NULL; | |
2960 } | |
2961 | |
2962 | |
2963 void JavaThread::print_stack_on(outputStream* st) { | |
2964 if (!has_last_Java_frame()) return; | |
2965 ResourceMark rm; | |
2966 HandleMark hm; | |
2967 | |
2968 RegisterMap reg_map(this); | |
2969 vframe* start_vf = last_java_vframe(®_map); | |
2970 int count = 0; | |
2971 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2972 if (f->is_java_frame()) { | |
2973 javaVFrame* jvf = javaVFrame::cast(f); | |
2974 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
2975 | |
2976 // Print out lock information | |
2977 if (JavaMonitorsInStackTrace) { | |
2978 jvf->print_lock_info_on(st, count); | |
2979 } | |
2980 } else { | |
2981 // Ignore non-Java frames | |
2982 } | |
2983 | |
2984 // Bail-out case for too deep stacks | |
2985 count++; | |
2986 if (MaxJavaStackTraceDepth == count) return; | |
2987 } | |
2988 } | |
2989 | |
2990 | |
2991 // JVMTI PopFrame support | |
2992 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
2993 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
2994 if (in_bytes(size_in_bytes) != 0) { | |
6197 | 2995 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
0 | 2996 _popframe_preserved_args_size = in_bytes(size_in_bytes); |
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2997 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
0 | 2998 } |
2999 } | |
3000 | |
3001 void* JavaThread::popframe_preserved_args() { | |
3002 return _popframe_preserved_args; | |
3003 } | |
3004 | |
3005 ByteSize JavaThread::popframe_preserved_args_size() { | |
3006 return in_ByteSize(_popframe_preserved_args_size); | |
3007 } | |
3008 | |
3009 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
3010 int sz = in_bytes(popframe_preserved_args_size()); | |
3011 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
3012 return in_WordSize(sz / wordSize); | |
3013 } | |
3014 | |
3015 void JavaThread::popframe_free_preserved_args() { | |
3016 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
6197 | 3017 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
0 | 3018 _popframe_preserved_args = NULL; |
3019 _popframe_preserved_args_size = 0; | |
3020 } | |
3021 | |
3022 #ifndef PRODUCT | |
3023 | |
3024 void JavaThread::trace_frames() { | |
3025 tty->print_cr("[Describe stack]"); | |
3026 int frame_no = 1; | |
3027 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
3028 tty->print(" %d. ", frame_no++); | |
3029 fst.current()->print_value_on(tty,this); | |
3030 tty->cr(); | |
3031 } | |
3032 } | |
3033 | |
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3034 class PrintAndVerifyOopClosure: public OopClosure { |
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3035 protected: |
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3036 template <class T> inline void do_oop_work(T* p) { |
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3037 oop obj = oopDesc::load_decode_heap_oop(p); |
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3038 if (obj == NULL) return; |
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3039 tty->print(INTPTR_FORMAT ": ", p); |
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3040 if (obj->is_oop_or_null()) { |
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3041 if (obj->is_objArray()) { |
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3042 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
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3043 } else { |
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3044 obj->print(); |
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3045 } |
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3046 } else { |
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3047 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
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3048 } |
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3049 tty->cr(); |
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|
3050 } |
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3051 public: |
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3052 virtual void do_oop(oop* p) { do_oop_work(p); } |
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|
3053 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3054 }; |
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3055 |
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3056 |
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|
3057 static void oops_print(frame* f, const RegisterMap *map) { |
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|
3058 PrintAndVerifyOopClosure print; |
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changeset
|
3059 f->print_value(); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
3899
diff
changeset
|
3060 f->oops_do(&print, NULL, (RegisterMap*)map); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3061 } |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3062 |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3063 // Print our all the locations that contain oops and whether they are |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3064 // valid or not. This useful when trying to find the oldest frame |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3065 // 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:
3899
diff
changeset
|
3066 // oldest. |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3067 void JavaThread::trace_oops() { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3068 tty->print_cr("[Trace oops]"); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3069 frames_do(oops_print); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3070 } |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3071 |
0 | 3072 |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3073 #ifdef ASSERT |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3074 // Print or validate the layout of stack frames |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3075 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
|
3076 ResourceMark rm; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3077 PRESERVE_EXCEPTION_MARK; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3078 FrameValues values; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3079 int frame_no = 0; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3080 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
diff
changeset
|
3081 fst.current()->describe(values, ++frame_no); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3082 if (depth == frame_no) break; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3083 } |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3084 if (validate_only) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3085 values.validate(); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3086 } else { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3087 tty->print_cr("[Describe stack layout]"); |
4042
b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
4007
diff
changeset
|
3088 values.print(this); |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3089 } |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3090 } |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3091 #endif |
3336
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
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|
3092 |
0 | 3093 void JavaThread::trace_stack_from(vframe* start_vf) { |
3094 ResourceMark rm; | |
3095 int vframe_no = 1; | |
3096 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3097 if (f->is_java_frame()) { | |
3098 javaVFrame::cast(f)->print_activation(vframe_no++); | |
3099 } else { | |
3100 f->print(); | |
3101 } | |
3102 if (vframe_no > StackPrintLimit) { | |
3103 tty->print_cr("...<more frames>..."); | |
3104 return; | |
3105 } | |
3106 } | |
3107 } | |
3108 | |
3109 | |
3110 void JavaThread::trace_stack() { | |
3111 if (!has_last_Java_frame()) return; | |
3112 ResourceMark rm; | |
3113 HandleMark hm; | |
3114 RegisterMap reg_map(this); | |
3115 trace_stack_from(last_java_vframe(®_map)); | |
3116 } | |
3117 | |
3118 | |
3119 #endif // PRODUCT | |
3120 | |
3121 | |
3122 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
3123 assert(reg_map != NULL, "a map must be given"); | |
3124 frame f = last_frame(); | |
3125 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
3126 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
3127 } | |
3128 return NULL; | |
3129 } | |
3130 | |
3131 | |
6725
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6964458: Reimplement class meta-data storage to use native memory
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diff
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|
3132 Klass* JavaThread::security_get_caller_class(int depth) { |
0 | 3133 vframeStream vfst(this); |
3134 vfst.security_get_caller_frame(depth); | |
3135 if (!vfst.at_end()) { | |
3136 return vfst.method()->method_holder(); | |
3137 } | |
3138 return NULL; | |
3139 } | |
3140 | |
3141 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
3142 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
3143 CompileBroker::compiler_thread_loop(); | |
3144 } | |
3145 | |
3146 // Create a CompilerThread | |
3147 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
3148 : JavaThread(&compiler_thread_entry) { | |
3149 _env = NULL; | |
3150 _log = NULL; | |
3151 _task = NULL; | |
3152 _queue = queue; | |
3153 _counters = counters; | |
1584 | 3154 _buffer_blob = NULL; |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3155 _scanned_nmethod = NULL; |
0 | 3156 |
3157 #ifndef PRODUCT | |
3158 _ideal_graph_printer = NULL; | |
3159 #endif | |
3160 } | |
3161 | |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3162 void CompilerThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3163 JavaThread::oops_do(f, cf); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3164 if (_scanned_nmethod != NULL && cf != NULL) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3165 // Safepoints can occur when the sweeper is scanning an nmethod so |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3166 // 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
|
3167 // a scan. |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3168 cf->do_code_blob(_scanned_nmethod); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3169 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3170 } |
0 | 3171 |
3172 // ======= Threads ======== | |
3173 | |
3174 // The Threads class links together all active threads, and provides | |
3175 // operations over all threads. It is protected by its own Mutex | |
3176 // lock, which is also used in other contexts to protect thread | |
3177 // operations from having the thread being operated on from exiting | |
3178 // and going away unexpectedly (e.g., safepoint synchronization) | |
3179 | |
3180 JavaThread* Threads::_thread_list = NULL; | |
3181 int Threads::_number_of_threads = 0; | |
3182 int Threads::_number_of_non_daemon_threads = 0; | |
3183 int Threads::_return_code = 0; | |
3184 size_t JavaThread::_stack_size_at_create = 0; | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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6198
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|
3185 #ifdef ASSERT |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
3186 bool Threads::_vm_complete = false; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
3187 #endif |
0 | 3188 |
3189 // All JavaThreads | |
3190 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
3191 | |
3192 void os_stream(); | |
3193 | |
3194 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
3195 void Threads::threads_do(ThreadClosure* tc) { | |
3196 assert_locked_or_safepoint(Threads_lock); | |
3197 // ALL_JAVA_THREADS iterates through all JavaThreads | |
3198 ALL_JAVA_THREADS(p) { | |
3199 tc->do_thread(p); | |
3200 } | |
3201 // Someday we could have a table or list of all non-JavaThreads. | |
3202 // For now, just manually iterate through them. | |
3203 tc->do_thread(VMThread::vm_thread()); | |
3204 Universe::heap()->gc_threads_do(tc); | |
323
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3205 WatcherThread *wt = WatcherThread::watcher_thread(); |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3206 // Strictly speaking, the following NULL check isn't sufficient to make sure |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3207 // the data for WatcherThread is still valid upon being examined. However, |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3208 // considering that WatchThread terminates when the VM is on the way to |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3209 // exit at safepoint, the chance of the above is extremely small. The right |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3210 // way to prevent termination of WatcherThread would be to acquire |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3211 // Terminator_lock, but we can't do that without violating the lock rank |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3212 // checking in some cases. |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3213 if (wt != NULL) |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3214 tc->do_thread(wt); |
b33eef719520
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xlu
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286
diff
changeset
|
3215 |
0 | 3216 // If CompilerThreads ever become non-JavaThreads, add them here |
3217 } | |
3218 | |
3219 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
3220 | |
242 | 3221 extern void JDK_Version_init(); |
3222 | |
0 | 3223 // Check version |
3224 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
3225 | |
3226 // Initialize the output stream module | |
3227 ostream_init(); | |
3228 | |
3229 // Process java launcher properties. | |
3230 Arguments::process_sun_java_launcher_properties(args); | |
3231 | |
3232 // Initialize the os module before using TLS | |
3233 os::init(); | |
3234 | |
3235 // Initialize system properties. | |
3236 Arguments::init_system_properties(); | |
3237 | |
242 | 3238 // So that JDK version can be used as a discrimintor when parsing arguments |
3239 JDK_Version_init(); | |
3240 | |
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3241 // Update/Initialize System properties after JDK version number is known |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3242 Arguments::init_version_specific_system_properties(); |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3243 |
0 | 3244 // Parse arguments |
3245 jint parse_result = Arguments::parse(args); | |
3246 if (parse_result != JNI_OK) return parse_result; | |
3247 | |
3248 if (PauseAtStartup) { | |
3249 os::pause(); | |
3250 } | |
3251 | |
4006 | 3252 #ifndef USDT2 |
0 | 3253 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
4006 | 3254 #else /* USDT2 */ |
3255 HOTSPOT_VM_INIT_BEGIN(); | |
3256 #endif /* USDT2 */ | |
0 | 3257 |
3258 // Record VM creation timing statistics | |
3259 TraceVmCreationTime create_vm_timer; | |
3260 create_vm_timer.start(); | |
3261 | |
3262 // Timing (must come after argument parsing) | |
3263 TraceTime timer("Create VM", TraceStartupTime); | |
3264 | |
3265 // Initialize the os module after parsing the args | |
3266 jint os_init_2_result = os::init_2(); | |
3267 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
3268 | |
6197 | 3269 // intialize TLS |
3270 ThreadLocalStorage::init(); | |
3271 | |
3272 // Bootstrap native memory tracking, so it can start recording memory | |
3273 // activities before worker thread is started. This is the first phase | |
3274 // of bootstrapping, VM is currently running in single-thread mode. | |
3275 MemTracker::bootstrap_single_thread(); | |
3276 | |
0 | 3277 // Initialize output stream logging |
3278 ostream_init_log(); | |
3279 | |
3280 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
3281 // Must be before create_vm_init_agents() | |
3282 if (Arguments::init_libraries_at_startup()) { | |
3283 convert_vm_init_libraries_to_agents(); | |
3284 } | |
3285 | |
3286 // Launch -agentlib/-agentpath and converted -Xrun agents | |
3287 if (Arguments::init_agents_at_startup()) { | |
3288 create_vm_init_agents(); | |
3289 } | |
3290 | |
3291 // Initialize Threads state | |
3292 _thread_list = NULL; | |
3293 _number_of_threads = 0; | |
3294 _number_of_non_daemon_threads = 0; | |
3295 | |
3296 // Initialize global data structures and create system classes in heap | |
3297 vm_init_globals(); | |
3298 | |
3299 // Attach the main thread to this os thread | |
3300 JavaThread* main_thread = new JavaThread(); | |
3301 main_thread->set_thread_state(_thread_in_vm); | |
3302 // must do this before set_active_handles and initialize_thread_local_storage | |
3303 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
3304 // change the stack size recorded here to one based on the java thread | |
3305 // stacksize. This adjusted size is what is used to figure the placement | |
3306 // of the guard pages. | |
3307 main_thread->record_stack_base_and_size(); | |
3308 main_thread->initialize_thread_local_storage(); | |
3309 | |
3310 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
3311 | |
3312 if (!main_thread->set_as_starting_thread()) { | |
3313 vm_shutdown_during_initialization( | |
3314 "Failed necessary internal allocation. Out of swap space"); | |
3315 delete main_thread; | |
3316 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3317 return JNI_ENOMEM; | |
3318 } | |
3319 | |
3320 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
3321 // crash Linux VM, see notes in os_linux.cpp. | |
3322 main_thread->create_stack_guard_pages(); | |
3323 | |
1878 | 3324 // Initialize Java-Level synchronization subsystem |
3325 ObjectMonitor::Initialize() ; | |
0 | 3326 |
6197 | 3327 // Second phase of bootstrapping, VM is about entering multi-thread mode |
3328 MemTracker::bootstrap_multi_thread(); | |
3329 | |
0 | 3330 // Initialize global modules |
3331 jint status = init_globals(); | |
3332 if (status != JNI_OK) { | |
3333 delete main_thread; | |
3334 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3335 return status; | |
3336 } | |
3337 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1608
diff
changeset
|
3338 // Should be done after the heap is fully created |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3339 main_thread->cache_global_variables(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1608
diff
changeset
|
3340 |
0 | 3341 HandleMark hm; |
3342 | |
3343 { MutexLocker mu(Threads_lock); | |
3344 Threads::add(main_thread); | |
3345 } | |
3346 | |
3347 // Any JVMTI raw monitors entered in onload will transition into | |
3348 // real raw monitor. VM is setup enough here for raw monitor enter. | |
3349 JvmtiExport::transition_pending_onload_raw_monitors(); | |
3350 | |
3351 if (VerifyBeforeGC && | |
3352 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
3353 Universe::heap()->prepare_for_verify(); | |
3354 Universe::verify(); // make sure we're starting with a clean slate | |
3355 } | |
3356 | |
6197 | 3357 // Fully start NMT |
3358 MemTracker::start(); | |
3359 | |
0 | 3360 // Create the VMThread |
3361 { TraceTime timer("Start VMThread", TraceStartupTime); | |
3362 VMThread::create(); | |
3363 Thread* vmthread = VMThread::vm_thread(); | |
3364 | |
3365 if (!os::create_thread(vmthread, os::vm_thread)) | |
3366 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
3367 | |
3368 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
3369 // Monitors can have spurious returns, must always check another state flag | |
3370 { | |
3371 MutexLocker ml(Notify_lock); | |
3372 os::start_thread(vmthread); | |
3373 while (vmthread->active_handles() == NULL) { | |
3374 Notify_lock->wait(); | |
3375 } | |
3376 } | |
3377 } | |
3378 | |
3379 assert (Universe::is_fully_initialized(), "not initialized"); | |
3380 EXCEPTION_MARK; | |
3381 | |
3382 // At this point, the Universe is initialized, but we have not executed | |
3383 // any byte code. Now is a good time (the only time) to dump out the | |
3384 // internal state of the JVM for sharing. | |
3385 if (DumpSharedSpaces) { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
3386 MetaspaceShared::preload_and_dump(CHECK_0); |
0 | 3387 ShouldNotReachHere(); |
3388 } | |
3389 | |
3390 // Always call even when there are not JVMTI environments yet, since environments | |
3391 // may be attached late and JVMTI must track phases of VM execution | |
3392 JvmtiExport::enter_start_phase(); | |
3393 | |
3394 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
3395 JvmtiExport::post_vm_start(); | |
3396 | |
3397 { | |
3398 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
3399 | |
3400 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3401 create_vm_init_libraries(); | |
3402 } | |
3403 | |
3404 if (InitializeJavaLangString) { | |
2177
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coleenp
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diff
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|
3405 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
0 | 3406 } else { |
3407 warning("java.lang.String not initialized"); | |
3408 } | |
3409 | |
18
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0
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|
3410 if (AggressiveOpts) { |
192
6d13fcb3663f
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diff
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|
3411 { |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
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62
diff
changeset
|
3412 // Forcibly initialize java/util/HashMap and mutate the private |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3413 // static final "frontCacheEnabled" field before we start creating instances |
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3414 #ifdef ASSERT |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
3415 Klass* tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
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|
3416 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
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parents:
0
diff
changeset
|
3417 #endif |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
3418 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
6d13fcb3663f
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|
3419 KlassHandle k = KlassHandle(THREAD, k_o); |
6d13fcb3663f
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kvn
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diff
changeset
|
3420 guarantee(k.not_null(), "Must find java/util/HashMap"); |
6d13fcb3663f
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kvn
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62
diff
changeset
|
3421 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3422 ik->initialize(CHECK_0); |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3423 fieldDescriptor fd; |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3424 // Possible we might not find this field; if so, don't break |
6d13fcb3663f
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kvn
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62
diff
changeset
|
3425 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
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parents:
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diff
changeset
|
3426 k()->java_mirror()->bool_field_put(fd.offset(), true); |
192
6d13fcb3663f
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parents:
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diff
changeset
|
3427 } |
6d13fcb3663f
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kvn
parents:
62
diff
changeset
|
3428 } |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3429 |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3430 if (UseStringCache) { |
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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441
diff
changeset
|
3431 // Forcibly initialize java/lang/StringValue and mutate the private |
192
6d13fcb3663f
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kvn
parents:
62
diff
changeset
|
3432 // static final "stringCacheEnabled" field before we start creating instances |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
3433 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3434 // Possible that StringValue isn't present: if so, silently don't break |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3435 if (k_o != NULL) { |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3436 KlassHandle k = KlassHandle(THREAD, k_o); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3437 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3438 ik->initialize(CHECK_0); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3439 fieldDescriptor fd; |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3440 // Possible we might not find this field: if so, silently don't break |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3441 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
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parents:
2302
diff
changeset
|
3442 k()->java_mirror()->bool_field_put(fd.offset(), true); |
669
eca19a8425b5
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parents:
441
diff
changeset
|
3443 } |
192
6d13fcb3663f
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62
diff
changeset
|
3444 } |
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3445 } |
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3446 } |
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3447 |
0 | 3448 // Initialize java_lang.System (needed before creating the thread) |
3449 if (InitializeJavaLangSystem) { | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3450 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3451 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
0 | 3452 Handle thread_group = create_initial_thread_group(CHECK_0); |
3453 Universe::set_main_thread_group(thread_group()); | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3454 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
0 | 3455 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
3456 main_thread->set_threadObj(thread_object); | |
3457 // Set thread status to running since main thread has | |
3458 // been started and running. | |
3459 java_lang_Thread::set_thread_status(thread_object, | |
3460 java_lang_Thread::RUNNABLE); | |
3461 | |
3462 // The VM preresolve methods to these classes. Make sure that get initialized | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3463 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3464 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
0 | 3465 // The VM creates & returns objects of this class. Make sure it's initialized. |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3466 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
0 | 3467 call_initializeSystemClass(CHECK_0); |
6181 | 3468 |
3469 // get the Java runtime name after java.lang.System is initialized | |
3470 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); | |
0 | 3471 } else { |
3472 warning("java.lang.System not initialized"); | |
3473 } | |
3474 | |
3475 // an instance of OutOfMemory exception has been allocated earlier | |
3476 if (InitializeJavaLangExceptionsErrors) { | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3477 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3478 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3479 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3480 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3481 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3482 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3483 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3484 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); |
0 | 3485 } else { |
3486 warning("java.lang.OutOfMemoryError has not been initialized"); | |
3487 warning("java.lang.NullPointerException has not been initialized"); | |
3488 warning("java.lang.ClassCastException has not been initialized"); | |
3489 warning("java.lang.ArrayStoreException has not been initialized"); | |
3490 warning("java.lang.ArithmeticException has not been initialized"); | |
3491 warning("java.lang.StackOverflowError has not been initialized"); | |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3492 warning("java.lang.IllegalArgumentException has not been initialized"); |
0 | 3493 } |
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2376
diff
changeset
|
3494 } |
0 | 3495 |
3496 // See : bugid 4211085. | |
3497 // Background : the static initializer of java.lang.Compiler tries to read | |
3498 // property"java.compiler" and read & write property "java.vm.info". | |
3499 // When a security manager is installed through the command line | |
3500 // option "-Djava.security.manager", the above properties are not | |
3501 // readable and the static initializer for java.lang.Compiler fails | |
3502 // resulting in a NoClassDefFoundError. This can happen in any | |
3503 // user code which calls methods in java.lang.Compiler. | |
3504 // Hack : the hack is to pre-load and initialize this class, so that only | |
3505 // system domains are on the stack when the properties are read. | |
3506 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
3507 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
3508 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
3509 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
3510 // 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
|
3511 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
0 | 3512 |
3513 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
3514 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
3515 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
3516 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
3517 // This should also be taken out as soon as 4211383 gets fixed. | |
3518 reset_vm_info_property(CHECK_0); | |
3519 | |
3520 quicken_jni_functions(); | |
3521 | |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3522 // Must be run after init_ft which initializes ft_enabled |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3523 if (TRACE_INITIALIZE() != JNI_OK) { |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3524 vm_exit_during_initialization("Failed to initialize tracing backend"); |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3525 } |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3526 |
0 | 3527 // Set flag that basic initialization has completed. Used by exceptions and various |
3528 // debug stuff, that does not work until all basic classes have been initialized. | |
3529 set_init_completed(); | |
3530 | |
4006 | 3531 #ifndef USDT2 |
0 | 3532 HS_DTRACE_PROBE(hotspot, vm__init__end); |
4006 | 3533 #else /* USDT2 */ |
3534 HOTSPOT_VM_INIT_END(); | |
3535 #endif /* USDT2 */ | |
0 | 3536 |
3537 // record VM initialization completion time | |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3538 #if INCLUDE_MANAGEMENT |
0 | 3539 Management::record_vm_init_completed(); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
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6769
diff
changeset
|
3540 #endif // INCLUDE_MANAGEMENT |
0 | 3541 |
3542 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3543 // valid exceptions may be thrown in the process. | |
3544 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3545 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3546 // anymore. We call vm_exit_during_initialization directly instead. | |
3547 SystemDictionary::compute_java_system_loader(THREAD); | |
3548 if (HAS_PENDING_EXCEPTION) { | |
3549 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3550 } | |
3551 | |
3552 #ifndef SERIALGC | |
3553 // Support for ConcurrentMarkSweep. This should be cleaned up | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3554 // 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
|
3555 // once things are properly refactored. XXX YSR |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3556 if (UseConcMarkSweepGC || UseG1GC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3557 if (UseConcMarkSweepGC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3558 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3559 } else { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3560 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3561 } |
0 | 3562 if (HAS_PENDING_EXCEPTION) { |
3563 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3564 } | |
3565 } | |
3566 #endif // SERIALGC | |
3567 | |
3568 // Always call even when there are not JVMTI environments yet, since environments | |
3569 // may be attached late and JVMTI must track phases of VM execution | |
3570 JvmtiExport::enter_live_phase(); | |
3571 | |
3572 // Signal Dispatcher needs to be started before VMInit event is posted | |
3573 os::signal_init(); | |
3574 | |
3575 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3576 if (!DisableAttachMechanism) { | |
3577 if (StartAttachListener || AttachListener::init_at_startup()) { | |
3578 AttachListener::init(); | |
3579 } | |
3580 } | |
3581 | |
3582 // Launch -Xrun agents | |
3583 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3584 // back-end can launch with -Xdebug -Xrunjdwp. | |
3585 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3586 create_vm_init_libraries(); | |
3587 } | |
3588 | |
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3589 // 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
|
3590 JvmtiExport::post_vm_initialized(); |
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3591 |
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3592 if (!TRACE_START()) { |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3593 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3594 } |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3595 |
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3596 if (CleanChunkPoolAsync) { |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3597 Chunk::start_chunk_pool_cleaner_task(); |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3598 } |
0 | 3599 |
3600 // initialize compiler(s) | |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
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6769
diff
changeset
|
3601 #if defined(COMPILER1) || defined(COMPILER2) |
0 | 3602 CompileBroker::compilation_init(); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3603 #endif |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
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6769
diff
changeset
|
3604 |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
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6769
diff
changeset
|
3605 #if INCLUDE_MANAGEMENT |
0 | 3606 Management::initialize(THREAD); |
6854
fb19af007ffc
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jprovino
parents:
6769
diff
changeset
|
3607 #endif // INCLUDE_MANAGEMENT |
fb19af007ffc
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6769
diff
changeset
|
3608 |
0 | 3609 if (HAS_PENDING_EXCEPTION) { |
3610 // management agent fails to start possibly due to | |
3611 // configuration problem and is responsible for printing | |
3612 // stack trace if appropriate. Simply exit VM. | |
3613 vm_exit(1); | |
3614 } | |
3615 | |
3616 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3617 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
3618 if (MemProfiling) MemProfiler::engage(); | |
3619 StatSampler::engage(); | |
3620 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3621 | |
3622 BiasedLocking::init(); | |
3623 | |
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3624 if (JDK_Version::current().post_vm_init_hook_enabled()) { |
8f8dfba37802
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|
3625 call_postVMInitHook(THREAD); |
8f8dfba37802
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3626 // The Java side of PostVMInitHook.run must deal with all |
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|
3627 // exceptions and provide means of diagnosis. |
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|
3628 if (HAS_PENDING_EXCEPTION) { |
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|
3629 CLEAR_PENDING_EXCEPTION; |
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6994753: Implement optional hook to a Java method at VM startup.
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|
3630 } |
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|
3631 } |
0 | 3632 |
3633 // Start up the WatcherThread if there are any periodic tasks | |
3634 // NOTE: All PeriodicTasks should be registered by now. If they | |
3635 // aren't, late joiners might appear to start slowly (we might | |
3636 // take a while to process their first tick). | |
3637 if (PeriodicTask::num_tasks() > 0) { | |
3638 WatcherThread::start(); | |
3639 } | |
3640 | |
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3641 // Give os specific code one last chance to start |
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|
3642 os::init_3(); |
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3643 |
0 | 3644 create_vm_timer.end(); |
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3645 #ifdef ASSERT |
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3646 _vm_complete = true; |
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3647 #endif |
0 | 3648 return JNI_OK; |
3649 } | |
3650 | |
3651 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3652 extern "C" { | |
3653 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3654 } | |
3655 // Find a command line agent library and return its entry point for | |
3656 // -agentlib: -agentpath: -Xrun | |
3657 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3658 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3659 OnLoadEntry_t on_load_entry = NULL; | |
3660 void *library = agent->os_lib(); // check if we have looked it up before | |
3661 | |
3662 if (library == NULL) { | |
3663 char buffer[JVM_MAXPATHLEN]; | |
3664 char ebuf[1024]; | |
3665 const char *name = agent->name(); | |
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3666 const char *msg = "Could not find agent library "; |
0 | 3667 |
3668 if (agent->is_absolute_path()) { | |
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|
3669 library = os::dll_load(name, ebuf, sizeof ebuf); |
0 | 3670 if (library == NULL) { |
1694
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|
3671 const char *sub_msg = " in absolute path, with error: "; |
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3672 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3673 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
1694
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|
3674 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3675 // If we can't find the agent, exit. |
1694
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|
3676 vm_exit_during_initialization(buf, NULL); |
6197 | 3677 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3678 } |
3679 } else { | |
3680 // Try to load the agent from the standard dll directory | |
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828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
3681 os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); |
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|
3682 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3683 #ifdef KERNEL |
3684 // Download instrument dll | |
3685 if (library == NULL && strcmp(name, "instrument") == 0) { | |
3686 char *props = Arguments::get_kernel_properties(); | |
3687 char *home = Arguments::get_java_home(); | |
3688 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
3689 " sun.jkernel.DownloadManager -download client_jvm"; | |
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|
3690 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
6197 | 3691 char *cmd = NEW_C_HEAP_ARRAY(char, length, mtThread); |
0 | 3692 jio_snprintf(cmd, length, fmt, home, props); |
3693 int status = os::fork_and_exec(cmd); | |
3694 FreeHeap(props); | |
3695 if (status == -1) { | |
3696 warning(cmd); | |
3697 vm_exit_during_initialization("fork_and_exec failed: %s", | |
3698 strerror(errno)); | |
3699 } | |
6197 | 3700 FREE_C_HEAP_ARRAY(char, cmd, mtThread); |
0 | 3701 // when this comes back the instrument.dll should be where it belongs. |
1980
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|
3702 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3703 } |
3704 #endif // KERNEL | |
3705 if (library == NULL) { // Try the local directory | |
3706 char ns[1] = {0}; | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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|
3707 os::dll_build_name(buffer, sizeof(buffer), ns, name); |
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changeset
|
3708 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3709 if (library == NULL) { |
1694
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|
3710 const char *sub_msg = " on the library path, with error: "; |
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|
3711 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3712 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
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changeset
|
3713 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3714 // If we can't find the agent, exit. |
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|
3715 vm_exit_during_initialization(buf, NULL); |
6197 | 3716 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3717 } |
3718 } | |
3719 } | |
3720 agent->set_os_lib(library); | |
3721 } | |
3722 | |
3723 // Find the OnLoad function. | |
3724 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
1980
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6348631: remove the use of the HPI library from Hotspot
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|
3725 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
0 | 3726 if (on_load_entry != NULL) break; |
3727 } | |
3728 return on_load_entry; | |
3729 } | |
3730 | |
3731 // Find the JVM_OnLoad entry point | |
3732 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3733 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3734 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3735 } | |
3736 | |
3737 // Find the Agent_OnLoad entry point | |
3738 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3739 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3740 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3741 } | |
3742 | |
3743 // For backwards compatibility with -Xrun | |
3744 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3745 // treated like -agentpath: | |
3746 // Must be called before agent libraries are created | |
3747 void Threads::convert_vm_init_libraries_to_agents() { | |
3748 AgentLibrary* agent; | |
3749 AgentLibrary* next; | |
3750 | |
3751 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3752 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3753 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3754 | |
3755 // If there is an JVM_OnLoad function it will get called later, | |
3756 // otherwise see if there is an Agent_OnLoad | |
3757 if (on_load_entry == NULL) { | |
3758 on_load_entry = lookup_agent_on_load(agent); | |
3759 if (on_load_entry != NULL) { | |
3760 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3761 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3762 Arguments::convert_library_to_agent(agent); | |
3763 } else { | |
3764 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3765 } | |
3766 } | |
3767 } | |
3768 } | |
3769 | |
3770 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3771 // Invokes Agent_OnLoad | |
3772 // Called very early -- before JavaThreads exist | |
3773 void Threads::create_vm_init_agents() { | |
3774 extern struct JavaVM_ main_vm; | |
3775 AgentLibrary* agent; | |
3776 | |
3777 JvmtiExport::enter_onload_phase(); | |
6854
fb19af007ffc
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6769
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changeset
|
3778 |
0 | 3779 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { |
3780 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3781 | |
3782 if (on_load_entry != NULL) { | |
3783 // Invoke the Agent_OnLoad function | |
3784 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3785 if (err != JNI_OK) { | |
3786 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3787 } | |
3788 } else { | |
3789 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3790 } | |
3791 } | |
3792 JvmtiExport::enter_primordial_phase(); | |
3793 } | |
3794 | |
3795 extern "C" { | |
3796 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3797 } | |
3798 | |
3799 void Threads::shutdown_vm_agents() { | |
3800 // Send any Agent_OnUnload notifications | |
3801 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
3802 extern struct JavaVM_ main_vm; | |
3803 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3804 | |
3805 // Find the Agent_OnUnload function. | |
3806 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
3807 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
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6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
3808 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
0 | 3809 |
3810 // Invoke the Agent_OnUnload function | |
3811 if (unload_entry != NULL) { | |
3812 JavaThread* thread = JavaThread::current(); | |
3813 ThreadToNativeFromVM ttn(thread); | |
3814 HandleMark hm(thread); | |
3815 (*unload_entry)(&main_vm); | |
3816 break; | |
3817 } | |
3818 } | |
3819 } | |
3820 } | |
3821 | |
3822 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3823 // Invokes JVM_OnLoad | |
3824 void Threads::create_vm_init_libraries() { | |
3825 extern struct JavaVM_ main_vm; | |
3826 AgentLibrary* agent; | |
3827 | |
3828 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3829 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3830 | |
3831 if (on_load_entry != NULL) { | |
3832 // Invoke the JVM_OnLoad function | |
3833 JavaThread* thread = JavaThread::current(); | |
3834 ThreadToNativeFromVM ttn(thread); | |
3835 HandleMark hm(thread); | |
3836 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3837 if (err != JNI_OK) { | |
3838 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3839 } | |
3840 } else { | |
3841 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3842 } | |
3843 } | |
3844 } | |
3845 | |
3846 // Last thread running calls java.lang.Shutdown.shutdown() | |
3847 void JavaThread::invoke_shutdown_hooks() { | |
3848 HandleMark hm(this); | |
3849 | |
3850 // We could get here with a pending exception, if so clear it now. | |
3851 if (this->has_pending_exception()) { | |
3852 this->clear_pending_exception(); | |
3853 } | |
3854 | |
3855 EXCEPTION_MARK; | |
6725
da91efe96a93
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3856 Klass* k = |
2177
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6990754: Use native memory and reference counting to implement SymbolTable
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diff
changeset
|
3857 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
0 | 3858 THREAD); |
3859 if (k != NULL) { | |
3860 // SystemDictionary::resolve_or_null will return null if there was | |
3861 // an exception. If we cannot load the Shutdown class, just don't | |
3862 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3863 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3864 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3865 // was called, the Shutdown class would have already been loaded | |
3866 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3867 instanceKlassHandle shutdown_klass (THREAD, k); | |
3868 JavaValue result(T_VOID); | |
3869 JavaCalls::call_static(&result, | |
3870 shutdown_klass, | |
2177
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changeset
|
3871 vmSymbols::shutdown_method_name(), |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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changeset
|
3872 vmSymbols::void_method_signature(), |
0 | 3873 THREAD); |
3874 } | |
3875 CLEAR_PENDING_EXCEPTION; | |
3876 } | |
3877 | |
3878 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3879 // the program falls off the end of main(). Another VM exit path is through | |
3880 // vm_exit() when the program calls System.exit() to return a value or when | |
3881 // there is a serious error in VM. The two shutdown paths are not exactly | |
3882 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3883 // and VM_Exit op at VM level. | |
3884 // | |
3885 // Shutdown sequence: | |
6197 | 3886 // + Shutdown native memory tracking if it is on |
0 | 3887 // + Wait until we are the last non-daemon thread to execute |
3888 // <-- every thing is still working at this moment --> | |
3889 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3890 // shutdown hooks, run finalizers if finalization-on-exit | |
3891 // + Call before_exit(), prepare for VM exit | |
3892 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3893 // currently the only user of this mechanism is File.deleteOnExit()) | |
3894 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3895 // post thread end and vm death events to JVMTI, | |
3896 // stop signal thread | |
3897 // + Call JavaThread::exit(), it will: | |
3898 // > release JNI handle blocks, remove stack guard pages | |
3899 // > remove this thread from Threads list | |
3900 // <-- no more Java code from this thread after this point --> | |
3901 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3902 // the compiler threads at safepoint | |
3903 // <-- do not use anything that could get blocked by Safepoint --> | |
3904 // + Disable tracing at JNI/JVM barriers | |
3905 // + Set _vm_exited flag for threads that are still running native code | |
3906 // + Delete this thread | |
3907 // + Call exit_globals() | |
3908 // > deletes tty | |
3909 // > deletes PerfMemory resources | |
3910 // + Return to caller | |
3911 | |
3912 bool Threads::destroy_vm() { | |
3913 JavaThread* thread = JavaThread::current(); | |
3914 | |
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da91efe96a93
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|
3915 #ifdef ASSERT |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
3916 _vm_complete = false; |
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|
3917 #endif |
0 | 3918 // Wait until we are the last non-daemon thread to execute |
3919 { MutexLocker nu(Threads_lock); | |
3920 while (Threads::number_of_non_daemon_threads() > 1 ) | |
3921 // This wait should make safepoint checks, wait without a timeout, | |
3922 // and wait as a suspend-equivalent condition. | |
3923 // | |
3924 // Note: If the FlatProfiler is running and this thread is waiting | |
3925 // for another non-daemon thread to finish, then the FlatProfiler | |
3926 // is waiting for the external suspend request on this thread to | |
3927 // complete. wait_for_ext_suspend_completion() will eventually | |
3928 // timeout, but that takes time. Making this wait a suspend- | |
3929 // equivalent condition solves that timeout problem. | |
3930 // | |
3931 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
3932 Mutex::_as_suspend_equivalent_flag); | |
3933 } | |
3934 | |
6197 | 3935 // Shutdown NMT before exit. Otherwise, |
3936 // it will run into trouble when system destroys static variables. | |
3937 MemTracker::shutdown(MemTracker::NMT_normal); | |
3938 | |
0 | 3939 // Hang forever on exit if we are reporting an error. |
3940 if (ShowMessageBoxOnError && is_error_reported()) { | |
3941 os::infinite_sleep(); | |
3942 } | |
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da091bb67459
7022037: Pause when exiting if debugger is attached on windows
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2203
diff
changeset
|
3943 os::wait_for_keypress_at_exit(); |
0 | 3944 |
3945 if (JDK_Version::is_jdk12x_version()) { | |
3946 // We are the last thread running, so check if finalizers should be run. | |
3947 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
3948 HandleMark rm(thread); | |
3949 Universe::run_finalizers_on_exit(); | |
3950 } else { | |
3951 // run Java level shutdown hooks | |
3952 thread->invoke_shutdown_hooks(); | |
3953 } | |
3954 | |
3955 before_exit(thread); | |
3956 | |
3957 thread->exit(true); | |
3958 | |
3959 // Stop VM thread. | |
3960 { | |
3961 // 4945125 The vm thread comes to a safepoint during exit. | |
3962 // GC vm_operations can get caught at the safepoint, and the | |
3963 // heap is unparseable if they are caught. Grab the Heap_lock | |
3964 // to prevent this. The GC vm_operations will not be able to | |
3965 // queue until after the vm thread is dead. | |
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ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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parents:
3388
diff
changeset
|
3966 // After this point, we'll never emerge out of the safepoint before |
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3967 // the VM exits, so concurrent GC threads do not need to be explicitly |
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3968 // stopped; they remain inactive until the process exits. |
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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parents:
3388
diff
changeset
|
3969 // Note: some concurrent G1 threads may be running during a safepoint, |
ef2d1b8f2dd4
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3970 // but these will not be accessing the heap, just some G1-specific side |
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3971 // data structures that are not accessed by any other threads but them |
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3972 // after this point in a terminal safepoint. |
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3973 |
0 | 3974 MutexLocker ml(Heap_lock); |
3975 | |
3976 VMThread::wait_for_vm_thread_exit(); | |
3977 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
3978 VMThread::destroy(); | |
3979 } | |
3980 | |
3981 // clean up ideal graph printers | |
3982 #if defined(COMPILER2) && !defined(PRODUCT) | |
3983 IdealGraphPrinter::clean_up(); | |
3984 #endif | |
3985 | |
3986 // Now, all Java threads are gone except daemon threads. Daemon threads | |
3987 // running Java code or in VM are stopped by the Safepoint. However, | |
3988 // daemon threads executing native code are still running. But they | |
3989 // will be stopped at native=>Java/VM barriers. Note that we can't | |
3990 // simply kill or suspend them, as it is inherently deadlock-prone. | |
3991 | |
3992 #ifndef PRODUCT | |
3993 // disable function tracing at JNI/JVM barriers | |
3994 TraceJNICalls = false; | |
3995 TraceJVMCalls = false; | |
3996 TraceRuntimeCalls = false; | |
3997 #endif | |
3998 | |
3999 VM_Exit::set_vm_exited(); | |
4000 | |
4001 notify_vm_shutdown(); | |
4002 | |
4003 delete thread; | |
4004 | |
4005 // exit_globals() will delete tty | |
4006 exit_globals(); | |
4007 | |
4008 return true; | |
4009 } | |
4010 | |
4011 | |
4012 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
4013 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
4014 return is_supported_jni_version(version); | |
4015 } | |
4016 | |
4017 | |
4018 jboolean Threads::is_supported_jni_version(jint version) { | |
4019 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
4020 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
4021 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
4022 return JNI_FALSE; | |
4023 } | |
4024 | |
4025 | |
4026 void Threads::add(JavaThread* p, bool force_daemon) { | |
4027 // The threads lock must be owned at this point | |
4028 assert_locked_or_safepoint(Threads_lock); | |
1842
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4029 |
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4030 // See the comment for this method in thread.hpp for its purpose and |
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4031 // why it is called here. |
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4032 p->initialize_queues(); |
0 | 4033 p->set_next(_thread_list); |
4034 _thread_list = p; | |
4035 _number_of_threads++; | |
4036 oop threadObj = p->threadObj(); | |
4037 bool daemon = true; | |
4038 // Bootstrapping problem: threadObj can be null for initial | |
4039 // JavaThread (or for threads attached via JNI) | |
4040 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
4041 _number_of_non_daemon_threads++; | |
4042 daemon = false; | |
4043 } | |
4044 | |
6197 | 4045 p->set_safepoint_visible(true); |
4046 | |
0 | 4047 ThreadService::add_thread(p, daemon); |
4048 | |
4049 // Possible GC point. | |
4872
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4050 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
0 | 4051 } |
4052 | |
4053 void Threads::remove(JavaThread* p) { | |
4054 // Extra scope needed for Thread_lock, so we can check | |
4055 // that we do not remove thread without safepoint code notice | |
4056 { MutexLocker ml(Threads_lock); | |
4057 | |
4058 assert(includes(p), "p must be present"); | |
4059 | |
4060 JavaThread* current = _thread_list; | |
4061 JavaThread* prev = NULL; | |
4062 | |
4063 while (current != p) { | |
4064 prev = current; | |
4065 current = current->next(); | |
4066 } | |
4067 | |
4068 if (prev) { | |
4069 prev->set_next(current->next()); | |
4070 } else { | |
4071 _thread_list = p->next(); | |
4072 } | |
4073 _number_of_threads--; | |
4074 oop threadObj = p->threadObj(); | |
4075 bool daemon = true; | |
4076 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
4077 _number_of_non_daemon_threads--; | |
4078 daemon = false; | |
4079 | |
4080 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
4081 // on destroy_vm will wake up. | |
4082 if (number_of_non_daemon_threads() == 1) | |
4083 Threads_lock->notify_all(); | |
4084 } | |
4085 ThreadService::remove_thread(p, daemon); | |
4086 | |
4087 // Make sure that safepoint code disregard this thread. This is needed since | |
4088 // the thread might mess around with locks after this point. This can cause it | |
4089 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
4090 // of this thread since it is removed from the queue. | |
4091 p->set_terminated_value(); | |
6197 | 4092 |
4093 // Now, this thread is not visible to safepoint | |
4094 p->set_safepoint_visible(false); | |
4095 | |
0 | 4096 } // unlock Threads_lock |
4097 | |
4098 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
4872
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4099 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
0 | 4100 } |
4101 | |
4102 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
4103 bool Threads::includes(JavaThread* p) { | |
4104 assert(Threads_lock->is_locked(), "sanity check"); | |
4105 ALL_JAVA_THREADS(q) { | |
4106 if (q == p ) { | |
4107 return true; | |
4108 } | |
4109 } | |
4110 return false; | |
4111 } | |
4112 | |
4113 // Operations on the Threads list for GC. These are not explicitly locked, | |
4114 // but the garbage collector must provide a safe context for them to run. | |
4115 // In particular, these things should never be called when the Threads_lock | |
4116 // is held by some other thread. (Note: the Safepoint abstraction also | |
4117 // uses the Threads_lock to gurantee this property. It also makes sure that | |
4118 // all threads gets blocked when exiting or starting). | |
4119 | |
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4120 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 4121 ALL_JAVA_THREADS(p) { |
989
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4122 p->oops_do(f, cf); |
0 | 4123 } |
989
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4124 VMThread::vm_thread()->oops_do(f, cf); |
0 | 4125 } |
4126 | |
989
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4127 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 4128 // Introduce a mechanism allowing parallel threads to claim threads as |
4129 // root groups. Overhead should be small enough to use all the time, | |
4130 // even in sequential code. | |
4131 SharedHeap* sh = SharedHeap::heap(); | |
4095
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4132 // Cannot yet substitute active_workers for n_par_threads |
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4133 // because of G1CollectedHeap::verify() use of |
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4134 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
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4135 // turn off parallelism in process_strong_roots while active_workers |
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4136 // is being used for parallelism elsewhere. |
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4137 bool is_par = sh->n_par_threads() > 0; |
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4138 assert(!is_par || |
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4139 (SharedHeap::heap()->n_par_threads() == |
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|
4140 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
0 | 4141 int cp = SharedHeap::heap()->strong_roots_parity(); |
4142 ALL_JAVA_THREADS(p) { | |
4143 if (p->claim_oops_do(is_par, cp)) { | |
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4144 p->oops_do(f, cf); |
0 | 4145 } |
4146 } | |
4147 VMThread* vmt = VMThread::vm_thread(); | |
3979
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4148 if (vmt->claim_oops_do(is_par, cp)) { |
989
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4149 vmt->oops_do(f, cf); |
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4150 } |
0 | 4151 } |
4152 | |
4153 #ifndef SERIALGC | |
4154 // Used by ParallelScavenge | |
4155 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
4156 ALL_JAVA_THREADS(p) { | |
4157 q->enqueue(new ThreadRootsTask(p)); | |
4158 } | |
4159 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
4160 } | |
4161 | |
4162 // Used by Parallel Old | |
4163 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
4164 ALL_JAVA_THREADS(p) { | |
4165 q->enqueue(new ThreadRootsMarkingTask(p)); | |
4166 } | |
4167 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
4168 } | |
4169 #endif // SERIALGC | |
4170 | |
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4171 void Threads::nmethods_do(CodeBlobClosure* cf) { |
0 | 4172 ALL_JAVA_THREADS(p) { |
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4173 p->nmethods_do(cf); |
0 | 4174 } |
989
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4175 VMThread::vm_thread()->nmethods_do(cf); |
0 | 4176 } |
4177 | |
6725
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6964458: Reimplement class meta-data storage to use native memory
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4178 void Threads::metadata_do(void f(Metadata*)) { |
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4179 ALL_JAVA_THREADS(p) { |
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4180 p->metadata_do(f); |
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4181 } |
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|
4182 } |
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4183 |
0 | 4184 void Threads::gc_epilogue() { |
4185 ALL_JAVA_THREADS(p) { | |
4186 p->gc_epilogue(); | |
4187 } | |
4188 } | |
4189 | |
4190 void Threads::gc_prologue() { | |
4191 ALL_JAVA_THREADS(p) { | |
4192 p->gc_prologue(); | |
4193 } | |
4194 } | |
4195 | |
4196 void Threads::deoptimized_wrt_marked_nmethods() { | |
4197 ALL_JAVA_THREADS(p) { | |
4198 p->deoptimized_wrt_marked_nmethods(); | |
4199 } | |
4200 } | |
4201 | |
4202 | |
4203 // Get count Java threads that are waiting to enter the specified monitor. | |
4204 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
4205 address monitor, bool doLock) { | |
4206 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
4207 "must grab Threads_lock or be at safepoint"); | |
4208 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
4209 | |
4210 int i = 0; | |
4211 { | |
4212 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4213 ALL_JAVA_THREADS(p) { | |
4214 if (p->is_Compiler_thread()) continue; | |
4215 | |
4216 address pending = (address)p->current_pending_monitor(); | |
4217 if (pending == monitor) { // found a match | |
4218 if (i < count) result->append(p); // save the first count matches | |
4219 i++; | |
4220 } | |
4221 } | |
4222 } | |
4223 return result; | |
4224 } | |
4225 | |
4226 | |
4227 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
4228 assert(doLock || | |
4229 Threads_lock->owned_by_self() || | |
4230 SafepointSynchronize::is_at_safepoint(), | |
4231 "must grab Threads_lock or be at safepoint"); | |
4232 | |
4233 // NULL owner means not locked so we can skip the search | |
4234 if (owner == NULL) return NULL; | |
4235 | |
4236 { | |
4237 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4238 ALL_JAVA_THREADS(p) { | |
4239 // first, see if owner is the address of a Java thread | |
4240 if (owner == (address)p) return p; | |
4241 } | |
4242 } | |
4243 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
4244 if (UseHeavyMonitors) return NULL; | |
4245 | |
4246 // | |
4247 // If we didn't find a matching Java thread and we didn't force use of | |
4248 // heavyweight monitors, then the owner is the stack address of the | |
4249 // Lock Word in the owning Java thread's stack. | |
4250 // | |
4251 JavaThread* the_owner = NULL; | |
4252 { | |
4253 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4254 ALL_JAVA_THREADS(q) { | |
702
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6699669: Hotspot server leaves synchronized block with monitor in bad state
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|
4255 if (q->is_lock_owned(owner)) { |
0 | 4256 the_owner = q; |
702
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|
4257 break; |
0 | 4258 } |
4259 } | |
4260 } | |
4261 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
4262 return the_owner; | |
4263 } | |
4264 | |
4265 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
4266 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
4267 char buf[32]; | |
4268 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
4269 | |
4270 st->print_cr("Full thread dump %s (%s %s):", | |
4271 Abstract_VM_Version::vm_name(), | |
4272 Abstract_VM_Version::vm_release(), | |
4273 Abstract_VM_Version::vm_info_string() | |
4274 ); | |
4275 st->cr(); | |
4276 | |
4277 #ifndef SERIALGC | |
4278 // Dump concurrent locks | |
4279 ConcurrentLocksDump concurrent_locks; | |
4280 if (print_concurrent_locks) { | |
4281 concurrent_locks.dump_at_safepoint(); | |
4282 } | |
4283 #endif // SERIALGC | |
4284 | |
4285 ALL_JAVA_THREADS(p) { | |
4286 ResourceMark rm; | |
4287 p->print_on(st); | |
4288 if (print_stacks) { | |
4289 if (internal_format) { | |
4290 p->trace_stack(); | |
4291 } else { | |
4292 p->print_stack_on(st); | |
4293 } | |
4294 } | |
4295 st->cr(); | |
4296 #ifndef SERIALGC | |
4297 if (print_concurrent_locks) { | |
4298 concurrent_locks.print_locks_on(p, st); | |
4299 } | |
4300 #endif // SERIALGC | |
4301 } | |
4302 | |
4303 VMThread::vm_thread()->print_on(st); | |
4304 st->cr(); | |
4305 Universe::heap()->print_gc_threads_on(st); | |
4306 WatcherThread* wt = WatcherThread::watcher_thread(); | |
6766 | 4307 if (wt != NULL) { |
4308 wt->print_on(st); | |
4309 st->cr(); | |
4310 } | |
0 | 4311 CompileBroker::print_compiler_threads_on(st); |
4312 st->flush(); | |
4313 } | |
4314 | |
4315 // Threads::print_on_error() is called by fatal error handler. It's possible | |
4316 // that VM is not at safepoint and/or current thread is inside signal handler. | |
4317 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
4318 // memory (even in resource area), it might deadlock the error handler. | |
4319 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
4320 bool found_current = false; | |
4321 st->print_cr("Java Threads: ( => current thread )"); | |
4322 ALL_JAVA_THREADS(thread) { | |
4323 bool is_current = (current == thread); | |
4324 found_current = found_current || is_current; | |
4325 | |
4326 st->print("%s", is_current ? "=>" : " "); | |
4327 | |
4328 st->print(PTR_FORMAT, thread); | |
4329 st->print(" "); | |
4330 thread->print_on_error(st, buf, buflen); | |
4331 st->cr(); | |
4332 } | |
4333 st->cr(); | |
4334 | |
4335 st->print_cr("Other Threads:"); | |
4336 if (VMThread::vm_thread()) { | |
4337 bool is_current = (current == VMThread::vm_thread()); | |
4338 found_current = found_current || is_current; | |
4339 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
4340 | |
4341 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
4342 st->print(" "); | |
4343 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
4344 st->cr(); | |
4345 } | |
4346 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4347 if (wt != NULL) { | |
4348 bool is_current = (current == wt); | |
4349 found_current = found_current || is_current; | |
4350 st->print("%s", is_current ? "=>" : " "); | |
4351 | |
4352 st->print(PTR_FORMAT, wt); | |
4353 st->print(" "); | |
4354 wt->print_on_error(st, buf, buflen); | |
4355 st->cr(); | |
4356 } | |
4357 if (!found_current) { | |
4358 st->cr(); | |
4359 st->print("=>" PTR_FORMAT " (exited) ", current); | |
4360 current->print_on_error(st, buf, buflen); | |
4361 st->cr(); | |
4362 } | |
4363 } | |
4364 | |
1878 | 4365 // Internal SpinLock and Mutex |
4366 // Based on ParkEvent | |
4367 | |
4368 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
0 | 4369 // |
1878 | 4370 // We employ SpinLocks _only for low-contention, fixed-length |
4371 // short-duration critical sections where we're concerned | |
4372 // about native mutex_t or HotSpot Mutex:: latency. | |
4373 // The mux construct provides a spin-then-block mutual exclusion | |
4374 // mechanism. | |
4375 // | |
4376 // Testing has shown that contention on the ListLock guarding gFreeList | |
4377 // is common. If we implement ListLock as a simple SpinLock it's common | |
4378 // for the JVM to devolve to yielding with little progress. This is true | |
4379 // despite the fact that the critical sections protected by ListLock are | |
4380 // extremely short. | |
0 | 4381 // |
1878 | 4382 // TODO-FIXME: ListLock should be of type SpinLock. |
4383 // We should make this a 1st-class type, integrated into the lock | |
4384 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
4385 // should have sufficient padding to avoid false-sharing and excessive | |
4386 // cache-coherency traffic. | |
4387 | |
4388 | |
4389 typedef volatile int SpinLockT ; | |
4390 | |
4391 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
4392 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
4393 return ; // normal fast-path return | |
4394 } | |
4395 | |
4396 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
4397 TEVENT (SpinAcquire - ctx) ; | |
4398 int ctr = 0 ; | |
4399 int Yields = 0 ; | |
0 | 4400 for (;;) { |
1878 | 4401 while (*adr != 0) { |
4402 ++ctr ; | |
4403 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
4404 if (Yields > 5) { | |
4405 // Consider using a simple NakedSleep() instead. | |
4406 // Then SpinAcquire could be called by non-JVM threads | |
4407 Thread::current()->_ParkEvent->park(1) ; | |
4408 } else { | |
4409 os::NakedYield() ; | |
4410 ++Yields ; | |
4411 } | |
4412 } else { | |
4413 SpinPause() ; | |
0 | 4414 } |
1878 | 4415 } |
4416 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
0 | 4417 } |
4418 } | |
4419 | |
1878 | 4420 void Thread::SpinRelease (volatile int * adr) { |
4421 assert (*adr != 0, "invariant") ; | |
4422 OrderAccess::fence() ; // guarantee at least release consistency. | |
4423 // Roach-motel semantics. | |
4424 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
4425 // but prior LDs and STs within the critical section can't be allowed | |
4426 // to reorder or float past the ST that releases the lock. | |
4427 *adr = 0 ; | |
0 | 4428 } |
4429 | |
1878 | 4430 // muxAcquire and muxRelease: |
4431 // | |
4432 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
4433 // The LSB of the word is set IFF the lock is held. | |
4434 // The remainder of the word points to the head of a singly-linked list | |
4435 // of threads blocked on the lock. | |
4436 // | |
4437 // * The current implementation of muxAcquire-muxRelease uses its own | |
4438 // dedicated Thread._MuxEvent instance. If we're interested in | |
4439 // minimizing the peak number of extant ParkEvent instances then | |
4440 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
4441 // as certain invariants were satisfied. Specifically, care would need | |
4442 // to be taken with regards to consuming unpark() "permits". | |
4443 // A safe rule of thumb is that a thread would never call muxAcquire() | |
4444 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
4445 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
4446 // consume an unpark() permit intended for monitorenter, for instance. | |
4447 // One way around this would be to widen the restricted-range semaphore | |
4448 // implemented in park(). Another alternative would be to provide | |
4449 // multiple instances of the PlatformEvent() for each thread. One | |
4450 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
4451 // | |
4452 // * Usage: | |
4453 // -- Only as leaf locks | |
4454 // -- for short-term locking only as muxAcquire does not perform | |
4455 // thread state transitions. | |
4456 // | |
4457 // Alternatives: | |
4458 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
4459 // but with parking or spin-then-park instead of pure spinning. | |
4460 // * Use Taura-Oyama-Yonenzawa locks. | |
4461 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
4462 // (List,LockByte). Acquire will CAS the full lockword while Release | |
4463 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
4464 // acquiring threads use timers (ParkTimed) to detect and recover from | |
4465 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
4466 // boundaries by using placement-new. | |
4467 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
4468 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
4469 // The validity of the backlinks must be ratified before we trust the value. | |
4470 // If the backlinks are invalid the exiting thread must back-track through the | |
4471 // the forward links, which are always trustworthy. | |
4472 // * Add a successor indication. The LockWord is currently encoded as | |
4473 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
4474 // to provide the usual futile-wakeup optimization. | |
4475 // See RTStt for details. | |
4476 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
4477 // | |
4478 | |
4479 | |
4480 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
4481 enum MuxBits { LOCKBIT = 1 } ; | |
4482 | |
4483 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
4484 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4485 if (w == 0) return ; | |
4486 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4487 return ; | |
4488 } | |
4489 | |
4490 TEVENT (muxAcquire - Contention) ; | |
4491 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
4492 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
0 | 4493 for (;;) { |
1878 | 4494 int its = (os::is_MP() ? 100 : 0) + 1 ; |
4495 | |
4496 // Optional spin phase: spin-then-park strategy | |
4497 while (--its >= 0) { | |
4498 w = *Lock ; | |
4499 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4500 return ; | |
4501 } | |
4502 } | |
4503 | |
4504 Self->reset() ; | |
4505 Self->OnList = intptr_t(Lock) ; | |
4506 // The following fence() isn't _strictly necessary as the subsequent | |
4507 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4508 OrderAccess::fence(); | |
4509 for (;;) { | |
4510 w = *Lock ; | |
4511 if ((w & LOCKBIT) == 0) { | |
4512 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4513 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
4514 return ; | |
4515 } | |
4516 continue ; // Interference -- *Lock changed -- Just retry | |
0 | 4517 } |
1878 | 4518 assert (w & LOCKBIT, "invariant") ; |
4519 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4520 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
4521 } | |
4522 | |
4523 while (Self->OnList != 0) { | |
4524 Self->park() ; | |
4525 } | |
0 | 4526 } |
4527 } | |
4528 | |
1878 | 4529 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
4530 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4531 if (w == 0) return ; | |
4532 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4533 return ; | |
4534 } | |
4535 | |
4536 TEVENT (muxAcquire - Contention) ; | |
4537 ParkEvent * ReleaseAfter = NULL ; | |
4538 if (ev == NULL) { | |
4539 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
4540 } | |
4541 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
4542 for (;;) { | |
4543 guarantee (ev->OnList == 0, "invariant") ; | |
4544 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
4545 | |
4546 // Optional spin phase: spin-then-park strategy | |
4547 while (--its >= 0) { | |
4548 w = *Lock ; | |
4549 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4550 if (ReleaseAfter != NULL) { | |
4551 ParkEvent::Release (ReleaseAfter) ; | |
4552 } | |
4553 return ; | |
4554 } | |
4555 } | |
4556 | |
4557 ev->reset() ; | |
4558 ev->OnList = intptr_t(Lock) ; | |
4559 // The following fence() isn't _strictly necessary as the subsequent | |
4560 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4561 OrderAccess::fence(); | |
4562 for (;;) { | |
4563 w = *Lock ; | |
4564 if ((w & LOCKBIT) == 0) { | |
4565 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4566 ev->OnList = 0 ; | |
4567 // We call ::Release while holding the outer lock, thus | |
4568 // artificially lengthening the critical section. | |
4569 // Consider deferring the ::Release() until the subsequent unlock(), | |
4570 // after we've dropped the outer lock. | |
4571 if (ReleaseAfter != NULL) { | |
4572 ParkEvent::Release (ReleaseAfter) ; | |
4573 } | |
4574 return ; | |
4575 } | |
4576 continue ; // Interference -- *Lock changed -- Just retry | |
4577 } | |
4578 assert (w & LOCKBIT, "invariant") ; | |
4579 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4580 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
4581 } | |
4582 | |
4583 while (ev->OnList != 0) { | |
4584 ev->park() ; | |
4585 } | |
4586 } | |
4587 } | |
4588 | |
4589 // Release() must extract a successor from the list and then wake that thread. | |
4590 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
4591 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
4592 // Release() would : | |
4593 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
4594 // (B) Extract a successor from the private list "in-hand" | |
4595 // (C) attempt to CAS() the residual back into *Lock over null. | |
4596 // If there were any newly arrived threads and the CAS() would fail. | |
4597 // In that case Release() would detach the RATs, re-merge the list in-hand | |
4598 // with the RATs and repeat as needed. Alternately, Release() might | |
4599 // detach and extract a successor, but then pass the residual list to the wakee. | |
4600 // The wakee would be responsible for reattaching and remerging before it | |
4601 // competed for the lock. | |
4602 // | |
4603 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
4604 // multiple concurrent pushers, but only one popper or detacher. | |
4605 // This implementation pops from the head of the list. This is unfair, | |
4606 // but tends to provide excellent throughput as hot threads remain hot. | |
4607 // (We wake recently run threads first). | |
4608 | |
4609 void Thread::muxRelease (volatile intptr_t * Lock) { | |
4610 for (;;) { | |
4611 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
4612 assert (w & LOCKBIT, "invariant") ; | |
4613 if (w == LOCKBIT) return ; | |
4614 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
4615 assert (List != NULL, "invariant") ; | |
4616 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
4617 ParkEvent * nxt = List->ListNext ; | |
4618 | |
4619 // The following CAS() releases the lock and pops the head element. | |
4620 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
4621 continue ; | |
4622 } | |
4623 List->OnList = 0 ; | |
4624 OrderAccess::fence() ; | |
4625 List->unpark () ; | |
4626 return ; | |
4627 } | |
4628 } | |
4629 | |
4630 | |
0 | 4631 void Threads::verify() { |
4632 ALL_JAVA_THREADS(p) { | |
4633 p->verify(); | |
4634 } | |
4635 VMThread* thread = VMThread::vm_thread(); | |
4636 if (thread != NULL) thread->verify(); | |
4637 } |