Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 7090:05ce1defa4f9
Common out some parts of UnsafeLoad/Store in UnsafeAccess
author | Gilles Duboscq <duboscq@ssw.jku.at> |
---|---|
date | Thu, 29 Nov 2012 13:24:08 +0100 |
parents | 679e6584c177 |
children | 1baf7f1e3f23 |
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" | |
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32 #ifdef GRAAL |
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33 #include "graal/graalCompiler.hpp" |
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34 #endif |
1972 | 35 #include "interpreter/interpreter.hpp" |
36 #include "interpreter/linkResolver.hpp" | |
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37 #include "interpreter/oopMapCache.hpp" |
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38 #include "jvmtifiles/jvmtiEnv.hpp" |
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39 #include "memory/gcLocker.inline.hpp" |
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40 #include "memory/metaspaceShared.hpp" |
1972 | 41 #include "memory/oopFactory.hpp" |
42 #include "memory/universe.inline.hpp" | |
43 #include "oops/instanceKlass.hpp" | |
44 #include "oops/objArrayOop.hpp" | |
45 #include "oops/oop.inline.hpp" | |
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46 #include "oops/symbol.hpp" |
1972 | 47 #include "prims/jvm_misc.hpp" |
48 #include "prims/jvmtiExport.hpp" | |
49 #include "prims/jvmtiThreadState.hpp" | |
50 #include "prims/privilegedStack.hpp" | |
51 #include "runtime/aprofiler.hpp" | |
52 #include "runtime/arguments.hpp" | |
53 #include "runtime/biasedLocking.hpp" | |
54 #include "runtime/deoptimization.hpp" | |
55 #include "runtime/fprofiler.hpp" | |
56 #include "runtime/frame.inline.hpp" | |
57 #include "runtime/init.hpp" | |
58 #include "runtime/interfaceSupport.hpp" | |
59 #include "runtime/java.hpp" | |
60 #include "runtime/javaCalls.hpp" | |
61 #include "runtime/jniPeriodicChecker.hpp" | |
62 #include "runtime/memprofiler.hpp" | |
63 #include "runtime/mutexLocker.hpp" | |
64 #include "runtime/objectMonitor.hpp" | |
65 #include "runtime/osThread.hpp" | |
66 #include "runtime/safepoint.hpp" | |
67 #include "runtime/sharedRuntime.hpp" | |
68 #include "runtime/statSampler.hpp" | |
69 #include "runtime/stubRoutines.hpp" | |
70 #include "runtime/task.hpp" | |
71 #include "runtime/threadCritical.hpp" | |
72 #include "runtime/threadLocalStorage.hpp" | |
73 #include "runtime/vframe.hpp" | |
74 #include "runtime/vframeArray.hpp" | |
75 #include "runtime/vframe_hp.hpp" | |
76 #include "runtime/vmThread.hpp" | |
77 #include "runtime/vm_operations.hpp" | |
78 #include "services/attachListener.hpp" | |
79 #include "services/management.hpp" | |
6197 | 80 #include "services/memTracker.hpp" |
1972 | 81 #include "services/threadService.hpp" |
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82 #include "trace/traceEventTypes.hpp" |
1972 | 83 #include "utilities/defaultStream.hpp" |
84 #include "utilities/dtrace.hpp" | |
85 #include "utilities/events.hpp" | |
86 #include "utilities/preserveException.hpp" | |
87 #ifdef TARGET_OS_FAMILY_linux | |
88 # include "os_linux.inline.hpp" | |
89 # include "thread_linux.inline.hpp" | |
90 #endif | |
91 #ifdef TARGET_OS_FAMILY_solaris | |
92 # include "os_solaris.inline.hpp" | |
93 # include "thread_solaris.inline.hpp" | |
94 #endif | |
95 #ifdef TARGET_OS_FAMILY_windows | |
96 # include "os_windows.inline.hpp" | |
97 # include "thread_windows.inline.hpp" | |
98 #endif | |
3960 | 99 #ifdef TARGET_OS_FAMILY_bsd |
100 # include "os_bsd.inline.hpp" | |
101 # include "thread_bsd.inline.hpp" | |
102 #endif | |
1972 | 103 #ifndef SERIALGC |
104 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
105 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
106 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
107 #endif | |
108 #ifdef COMPILER1 | |
109 #include "c1/c1_Compiler.hpp" | |
110 #endif | |
111 #ifdef COMPILER2 | |
112 #include "opto/c2compiler.hpp" | |
113 #include "opto/idealGraphPrinter.hpp" | |
114 #endif | |
0 | 115 |
116 #ifdef DTRACE_ENABLED | |
117 | |
118 // Only bother with this argument setup if dtrace is available | |
119 | |
4006 | 120 #ifndef USDT2 |
0 | 121 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
122 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
123 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
124 intptr_t, intptr_t, bool); | |
125 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
126 intptr_t, intptr_t, bool); | |
127 | |
128 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
129 { \ | |
130 ResourceMark rm(this); \ | |
131 int len = 0; \ | |
132 const char* name = (javathread)->get_thread_name(); \ | |
133 len = strlen(name); \ | |
134 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
135 name, len, \ | |
136 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
137 (javathread)->osthread()->thread_id(), \ | |
138 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
139 } | |
140 | |
4006 | 141 #else /* USDT2 */ |
142 | |
143 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
144 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
145 | |
146 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
147 { \ | |
148 ResourceMark rm(this); \ | |
149 int len = 0; \ | |
150 const char* name = (javathread)->get_thread_name(); \ | |
151 len = strlen(name); \ | |
152 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
153 (char *) name, len, \ | |
154 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
155 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
156 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
157 } | |
158 | |
159 #endif /* USDT2 */ | |
160 | |
0 | 161 #else // ndef DTRACE_ENABLED |
162 | |
163 #define DTRACE_THREAD_PROBE(probe, javathread) | |
164 | |
165 #endif // ndef DTRACE_ENABLED | |
166 | |
6197 | 167 |
0 | 168 // Class hierarchy |
169 // - Thread | |
170 // - VMThread | |
171 // - WatcherThread | |
172 // - ConcurrentMarkSweepThread | |
173 // - JavaThread | |
174 // - CompilerThread | |
175 | |
176 // ======= Thread ======== | |
177 // Support for forcing alignment of thread objects for biased locking | |
6197 | 178 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
0 | 179 if (UseBiasedLocking) { |
180 const int alignment = markOopDesc::biased_lock_alignment; | |
181 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
6197 | 182 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
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183 : AllocateHeap(aligned_size, flags, CURRENT_PC, |
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184 AllocFailStrategy::RETURN_NULL); |
0 | 185 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
186 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
187 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
188 "JavaThread alignment code overflowed allocated storage"); | |
189 if (TraceBiasedLocking) { | |
190 if (aligned_addr != real_malloc_addr) | |
191 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
192 real_malloc_addr, aligned_addr); | |
193 } | |
194 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
195 return aligned_addr; | |
196 } else { | |
6197 | 197 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
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198 : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL); |
0 | 199 } |
200 } | |
201 | |
202 void Thread::operator delete(void* p) { | |
203 if (UseBiasedLocking) { | |
204 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
6197 | 205 FreeHeap(real_malloc_addr, mtThread); |
0 | 206 } else { |
6197 | 207 FreeHeap(p, mtThread); |
0 | 208 } |
209 } | |
210 | |
211 | |
212 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
213 // JavaThread | |
214 | |
215 | |
216 Thread::Thread() { | |
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217 // stack and get_thread |
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218 set_stack_base(NULL); |
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219 set_stack_size(0); |
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220 set_self_raw_id(0); |
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221 set_lgrp_id(-1); |
0 | 222 |
223 // allocated data structures | |
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224 set_osthread(NULL); |
6197 | 225 set_resource_area(new (mtThread)ResourceArea()); |
226 set_handle_area(new (mtThread) HandleArea(NULL)); | |
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227 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(300, true)); |
0 | 228 set_active_handles(NULL); |
229 set_free_handle_block(NULL); | |
230 set_last_handle_mark(NULL); | |
231 | |
232 // This initial value ==> never claimed. | |
233 _oops_do_parity = 0; | |
234 | |
235 // the handle mark links itself to last_handle_mark | |
236 new HandleMark(this); | |
237 | |
238 // plain initialization | |
239 debug_only(_owned_locks = NULL;) | |
240 debug_only(_allow_allocation_count = 0;) | |
241 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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242 NOT_PRODUCT(_skip_gcalot = false;) |
0 | 243 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
244 _jvmti_env_iteration_count = 0; | |
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245 set_allocated_bytes(0); |
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246 set_trace_buffer(NULL); |
0 | 247 _vm_operation_started_count = 0; |
248 _vm_operation_completed_count = 0; | |
249 _current_pending_monitor = NULL; | |
250 _current_pending_monitor_is_from_java = true; | |
251 _current_waiting_monitor = NULL; | |
252 _num_nested_signal = 0; | |
253 omFreeList = NULL ; | |
254 omFreeCount = 0 ; | |
255 omFreeProvision = 32 ; | |
1587 | 256 omInUseList = NULL ; |
257 omInUseCount = 0 ; | |
0 | 258 |
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259 #ifdef ASSERT |
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260 _visited_for_critical_count = false; |
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261 #endif |
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262 |
0 | 263 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
264 _suspend_flags = 0; | |
265 | |
266 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
267 _hashStateX = os::random() ; | |
268 _hashStateY = 842502087 ; | |
269 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
270 _hashStateW = 273326509 ; | |
271 | |
272 _OnTrap = 0 ; | |
273 _schedctl = NULL ; | |
274 _Stalled = 0 ; | |
275 _TypeTag = 0x2BAD ; | |
276 | |
277 // Many of the following fields are effectively final - immutable | |
278 // Note that nascent threads can't use the Native Monitor-Mutex | |
279 // construct until the _MutexEvent is initialized ... | |
280 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
281 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
282 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
283 // and ::Release() | |
284 _ParkEvent = ParkEvent::Allocate (this) ; | |
285 _SleepEvent = ParkEvent::Allocate (this) ; | |
286 _MutexEvent = ParkEvent::Allocate (this) ; | |
287 _MuxEvent = ParkEvent::Allocate (this) ; | |
288 | |
289 #ifdef CHECK_UNHANDLED_OOPS | |
290 if (CheckUnhandledOops) { | |
291 _unhandled_oops = new UnhandledOops(this); | |
292 } | |
293 #endif // CHECK_UNHANDLED_OOPS | |
294 #ifdef ASSERT | |
295 if (UseBiasedLocking) { | |
296 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
297 assert(this == _real_malloc_address || | |
298 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
299 "bug in forced alignment of thread objects"); | |
300 } | |
301 #endif /* ASSERT */ | |
302 } | |
303 | |
304 void Thread::initialize_thread_local_storage() { | |
305 // Note: Make sure this method only calls | |
306 // non-blocking operations. Otherwise, it might not work | |
307 // with the thread-startup/safepoint interaction. | |
308 | |
309 // During Java thread startup, safepoint code should allow this | |
310 // method to complete because it may need to allocate memory to | |
311 // store information for the new thread. | |
312 | |
313 // initialize structure dependent on thread local storage | |
314 ThreadLocalStorage::set_thread(this); | |
315 } | |
316 | |
317 void Thread::record_stack_base_and_size() { | |
318 set_stack_base(os::current_stack_base()); | |
319 set_stack_size(os::current_stack_size()); | |
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320 // CR 7190089: on Solaris, primordial thread's stack is adjusted |
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321 // in initialize_thread(). Without the adjustment, stack size is |
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322 // incorrect if stack is set to unlimited (ulimit -s unlimited). |
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323 // So far, only Solaris has real implementation of initialize_thread(). |
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324 // |
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325 // set up any platform-specific state. |
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326 os::initialize_thread(this); |
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327 |
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328 #if INCLUDE_NMT |
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329 // record thread's native stack, stack grows downward |
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330 address stack_low_addr = stack_base() - stack_size(); |
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331 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, |
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332 CURRENT_PC); |
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333 #endif // INCLUDE_NMT |
0 | 334 } |
335 | |
336 | |
337 Thread::~Thread() { | |
338 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
339 ObjectSynchronizer::omFlush (this) ; | |
340 | |
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341 // stack_base can be NULL if the thread is never started or exited before |
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342 // record_stack_base_and_size called. Although, we would like to ensure |
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343 // that all started threads do call record_stack_base_and_size(), there is |
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344 // not proper way to enforce that. |
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345 #if INCLUDE_NMT |
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346 if (_stack_base != NULL) { |
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347 address low_stack_addr = stack_base() - stack_size(); |
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348 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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349 #ifdef ASSERT |
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350 set_stack_base(NULL); |
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351 #endif |
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352 } |
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353 #endif // INCLUDE_NMT |
6197 | 354 |
0 | 355 // deallocate data structures |
356 delete resource_area(); | |
357 // since the handle marks are using the handle area, we have to deallocated the root | |
358 // handle mark before deallocating the thread's handle area, | |
359 assert(last_handle_mark() != NULL, "check we have an element"); | |
360 delete last_handle_mark(); | |
361 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
362 | |
363 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
364 // We NULL out the fields for good hygiene. | |
365 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
366 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
367 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
368 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
369 | |
370 delete handle_area(); | |
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371 delete metadata_handles(); |
0 | 372 |
373 // osthread() can be NULL, if creation of thread failed. | |
374 if (osthread() != NULL) os::free_thread(osthread()); | |
375 | |
376 delete _SR_lock; | |
377 | |
378 // clear thread local storage if the Thread is deleting itself | |
379 if (this == Thread::current()) { | |
380 ThreadLocalStorage::set_thread(NULL); | |
381 } else { | |
382 // In the case where we're not the current thread, invalidate all the | |
383 // caches in case some code tries to get the current thread or the | |
384 // thread that was destroyed, and gets stale information. | |
385 ThreadLocalStorage::invalidate_all(); | |
386 } | |
387 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
388 } | |
389 | |
390 // NOTE: dummy function for assertion purpose. | |
391 void Thread::run() { | |
392 ShouldNotReachHere(); | |
393 } | |
394 | |
395 #ifdef ASSERT | |
396 // Private method to check for dangling thread pointer | |
397 void check_for_dangling_thread_pointer(Thread *thread) { | |
398 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
399 "possibility of dangling Thread pointer"); | |
400 } | |
401 #endif | |
402 | |
403 | |
404 #ifndef PRODUCT | |
405 // Tracing method for basic thread operations | |
406 void Thread::trace(const char* msg, const Thread* const thread) { | |
407 if (!TraceThreadEvents) return; | |
408 ResourceMark rm; | |
409 ThreadCritical tc; | |
410 const char *name = "non-Java thread"; | |
411 int prio = -1; | |
412 if (thread->is_Java_thread() | |
413 && !thread->is_Compiler_thread()) { | |
414 // The Threads_lock must be held to get information about | |
415 // this thread but may not be in some situations when | |
416 // tracing thread events. | |
417 bool release_Threads_lock = false; | |
418 if (!Threads_lock->owned_by_self()) { | |
419 Threads_lock->lock(); | |
420 release_Threads_lock = true; | |
421 } | |
422 JavaThread* jt = (JavaThread *)thread; | |
423 name = (char *)jt->get_thread_name(); | |
424 oop thread_oop = jt->threadObj(); | |
425 if (thread_oop != NULL) { | |
426 prio = java_lang_Thread::priority(thread_oop); | |
427 } | |
428 if (release_Threads_lock) { | |
429 Threads_lock->unlock(); | |
430 } | |
431 } | |
432 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
433 } | |
434 #endif | |
435 | |
436 | |
437 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
438 trace("get priority", thread); | |
439 ThreadPriority priority; | |
440 // Can return an error! | |
441 (void)os::get_priority(thread, priority); | |
442 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
443 return priority; | |
444 } | |
445 | |
446 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
447 trace("set priority", thread); | |
448 debug_only(check_for_dangling_thread_pointer(thread);) | |
449 // Can return an error! | |
450 (void)os::set_priority(thread, priority); | |
451 } | |
452 | |
453 | |
454 void Thread::start(Thread* thread) { | |
455 trace("start", thread); | |
456 // Start is different from resume in that its safety is guaranteed by context or | |
457 // being called from a Java method synchronized on the Thread object. | |
458 if (!DisableStartThread) { | |
459 if (thread->is_Java_thread()) { | |
460 // Initialize the thread state to RUNNABLE before starting this thread. | |
461 // Can not set it after the thread started because we do not know the | |
462 // exact thread state at that time. It could be in MONITOR_WAIT or | |
463 // in SLEEPING or some other state. | |
464 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
465 java_lang_Thread::RUNNABLE); | |
466 } | |
467 os::start_thread(thread); | |
468 } | |
469 } | |
470 | |
471 // Enqueue a VM_Operation to do the job for us - sometime later | |
472 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
473 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
474 VMThread::execute(vm_stop); | |
475 } | |
476 | |
477 | |
478 // | |
479 // Check if an external suspend request has completed (or has been | |
480 // cancelled). Returns true if the thread is externally suspended and | |
481 // false otherwise. | |
482 // | |
483 // The bits parameter returns information about the code path through | |
484 // the routine. Useful for debugging: | |
485 // | |
486 // set in is_ext_suspend_completed(): | |
487 // 0x00000001 - routine was entered | |
488 // 0x00000010 - routine return false at end | |
489 // 0x00000100 - thread exited (return false) | |
490 // 0x00000200 - suspend request cancelled (return false) | |
491 // 0x00000400 - thread suspended (return true) | |
492 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
493 // 0x00002000 - thread is native and walkable (return true) | |
494 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
495 // | |
496 // set in wait_for_ext_suspend_completion(): | |
497 // 0x00010000 - routine was entered | |
498 // 0x00020000 - suspend request cancelled before loop (return false) | |
499 // 0x00040000 - thread suspended before loop (return true) | |
500 // 0x00080000 - suspend request cancelled in loop (return false) | |
501 // 0x00100000 - thread suspended in loop (return true) | |
502 // 0x00200000 - suspend not completed during retry loop (return false) | |
503 // | |
504 | |
505 // Helper class for tracing suspend wait debug bits. | |
506 // | |
507 // 0x00000100 indicates that the target thread exited before it could | |
508 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
509 // 0x00080000 each indicate a cancelled suspend request so they don't | |
510 // count as wait failures either. | |
511 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
512 | |
513 class TraceSuspendDebugBits : public StackObj { | |
514 private: | |
515 JavaThread * jt; | |
516 bool is_wait; | |
517 bool called_by_wait; // meaningful when !is_wait | |
518 uint32_t * bits; | |
519 | |
520 public: | |
521 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
522 uint32_t *_bits) { | |
523 jt = _jt; | |
524 is_wait = _is_wait; | |
525 called_by_wait = _called_by_wait; | |
526 bits = _bits; | |
527 } | |
528 | |
529 ~TraceSuspendDebugBits() { | |
530 if (!is_wait) { | |
531 #if 1 | |
532 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
533 // That trace is very chatty. | |
534 return; | |
535 #else | |
536 if (!called_by_wait) { | |
537 // If tracing for is_ext_suspend_completed() is enabled, then only | |
538 // trace calls to it from wait_for_ext_suspend_completion() | |
539 return; | |
540 } | |
541 #endif | |
542 } | |
543 | |
544 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
545 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
546 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
547 ResourceMark rm; | |
548 | |
549 tty->print_cr( | |
550 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
551 jt->get_thread_name(), *bits); | |
552 | |
553 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
554 } | |
555 } | |
556 } | |
557 }; | |
558 #undef DEBUG_FALSE_BITS | |
559 | |
560 | |
561 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
562 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
563 | |
564 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
565 bool do_trans_retry; // flag to force the retry | |
566 | |
567 *bits |= 0x00000001; | |
568 | |
569 do { | |
570 do_trans_retry = false; | |
571 | |
572 if (is_exiting()) { | |
573 // Thread is in the process of exiting. This is always checked | |
574 // first to reduce the risk of dereferencing a freed JavaThread. | |
575 *bits |= 0x00000100; | |
576 return false; | |
577 } | |
578 | |
579 if (!is_external_suspend()) { | |
580 // Suspend request is cancelled. This is always checked before | |
581 // is_ext_suspended() to reduce the risk of a rogue resume | |
582 // confusing the thread that made the suspend request. | |
583 *bits |= 0x00000200; | |
584 return false; | |
585 } | |
586 | |
587 if (is_ext_suspended()) { | |
588 // thread is suspended | |
589 *bits |= 0x00000400; | |
590 return true; | |
591 } | |
592 | |
593 // Now that we no longer do hard suspends of threads running | |
594 // native code, the target thread can be changing thread state | |
595 // while we are in this routine: | |
596 // | |
597 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
598 // | |
599 // We save a copy of the thread state as observed at this moment | |
600 // and make our decision about suspend completeness based on the | |
601 // copy. This closes the race where the thread state is seen as | |
602 // _thread_in_native_trans in the if-thread_blocked check, but is | |
603 // seen as _thread_blocked in if-thread_in_native_trans check. | |
604 JavaThreadState save_state = thread_state(); | |
605 | |
606 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
607 // If the thread's state is _thread_blocked and this blocking | |
608 // condition is known to be equivalent to a suspend, then we can | |
609 // consider the thread to be externally suspended. This means that | |
610 // the code that sets _thread_blocked has been modified to do | |
611 // self-suspension if the blocking condition releases. We also | |
612 // used to check for CONDVAR_WAIT here, but that is now covered by | |
613 // the _thread_blocked with self-suspension check. | |
614 // | |
615 // Return true since we wouldn't be here unless there was still an | |
616 // external suspend request. | |
617 *bits |= 0x00001000; | |
618 return true; | |
619 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
620 // Threads running native code will self-suspend on native==>VM/Java | |
621 // transitions. If its stack is walkable (should always be the case | |
622 // unless this function is called before the actual java_suspend() | |
623 // call), then the wait is done. | |
624 *bits |= 0x00002000; | |
625 return true; | |
626 } else if (!called_by_wait && !did_trans_retry && | |
627 save_state == _thread_in_native_trans && | |
628 frame_anchor()->walkable()) { | |
629 // The thread is transitioning from thread_in_native to another | |
630 // thread state. check_safepoint_and_suspend_for_native_trans() | |
631 // will force the thread to self-suspend. If it hasn't gotten | |
632 // there yet we may have caught the thread in-between the native | |
633 // code check above and the self-suspend. Lucky us. If we were | |
634 // called by wait_for_ext_suspend_completion(), then it | |
635 // will be doing the retries so we don't have to. | |
636 // | |
637 // Since we use the saved thread state in the if-statement above, | |
638 // there is a chance that the thread has already transitioned to | |
639 // _thread_blocked by the time we get here. In that case, we will | |
640 // make a single unnecessary pass through the logic below. This | |
641 // doesn't hurt anything since we still do the trans retry. | |
642 | |
643 *bits |= 0x00004000; | |
644 | |
645 // Once the thread leaves thread_in_native_trans for another | |
646 // thread state, we break out of this retry loop. We shouldn't | |
647 // need this flag to prevent us from getting back here, but | |
648 // sometimes paranoia is good. | |
649 did_trans_retry = true; | |
650 | |
651 // We wait for the thread to transition to a more usable state. | |
652 for (int i = 1; i <= SuspendRetryCount; i++) { | |
653 // We used to do an "os::yield_all(i)" call here with the intention | |
654 // that yielding would increase on each retry. However, the parameter | |
655 // is ignored on Linux which means the yield didn't scale up. Waiting | |
656 // on the SR_lock below provides a much more predictable scale up for | |
657 // the delay. It also provides a simple/direct point to check for any | |
658 // safepoint requests from the VMThread | |
659 | |
660 // temporarily drops SR_lock while doing wait with safepoint check | |
661 // (if we're a JavaThread - the WatcherThread can also call this) | |
662 // and increase delay with each retry | |
663 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
664 | |
665 // check the actual thread state instead of what we saved above | |
666 if (thread_state() != _thread_in_native_trans) { | |
667 // the thread has transitioned to another thread state so | |
668 // try all the checks (except this one) one more time. | |
669 do_trans_retry = true; | |
670 break; | |
671 } | |
672 } // end retry loop | |
673 | |
674 | |
675 } | |
676 } while (do_trans_retry); | |
677 | |
678 *bits |= 0x00000010; | |
679 return false; | |
680 } | |
681 | |
682 // | |
683 // Wait for an external suspend request to complete (or be cancelled). | |
684 // Returns true if the thread is externally suspended and false otherwise. | |
685 // | |
686 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
687 uint32_t *bits) { | |
688 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
689 false /* !called_by_wait */, bits); | |
690 | |
691 // local flag copies to minimize SR_lock hold time | |
692 bool is_suspended; | |
693 bool pending; | |
694 uint32_t reset_bits; | |
695 | |
696 // set a marker so is_ext_suspend_completed() knows we are the caller | |
697 *bits |= 0x00010000; | |
698 | |
699 // We use reset_bits to reinitialize the bits value at the top of | |
700 // each retry loop. This allows the caller to make use of any | |
701 // unused bits for their own marking purposes. | |
702 reset_bits = *bits; | |
703 | |
704 { | |
705 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
706 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
707 delay, bits); | |
708 pending = is_external_suspend(); | |
709 } | |
710 // must release SR_lock to allow suspension to complete | |
711 | |
712 if (!pending) { | |
713 // A cancelled suspend request is the only false return from | |
714 // is_ext_suspend_completed() that keeps us from entering the | |
715 // retry loop. | |
716 *bits |= 0x00020000; | |
717 return false; | |
718 } | |
719 | |
720 if (is_suspended) { | |
721 *bits |= 0x00040000; | |
722 return true; | |
723 } | |
724 | |
725 for (int i = 1; i <= retries; i++) { | |
726 *bits = reset_bits; // reinit to only track last retry | |
727 | |
728 // We used to do an "os::yield_all(i)" call here with the intention | |
729 // that yielding would increase on each retry. However, the parameter | |
730 // is ignored on Linux which means the yield didn't scale up. Waiting | |
731 // on the SR_lock below provides a much more predictable scale up for | |
732 // the delay. It also provides a simple/direct point to check for any | |
733 // safepoint requests from the VMThread | |
734 | |
735 { | |
736 MutexLocker ml(SR_lock()); | |
737 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
738 // can also call this) and increase delay with each retry | |
739 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
740 | |
741 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
742 delay, bits); | |
743 | |
744 // It is possible for the external suspend request to be cancelled | |
745 // (by a resume) before the actual suspend operation is completed. | |
746 // Refresh our local copy to see if we still need to wait. | |
747 pending = is_external_suspend(); | |
748 } | |
749 | |
750 if (!pending) { | |
751 // A cancelled suspend request is the only false return from | |
752 // is_ext_suspend_completed() that keeps us from staying in the | |
753 // retry loop. | |
754 *bits |= 0x00080000; | |
755 return false; | |
756 } | |
757 | |
758 if (is_suspended) { | |
759 *bits |= 0x00100000; | |
760 return true; | |
761 } | |
762 } // end retry loop | |
763 | |
764 // thread did not suspend after all our retries | |
765 *bits |= 0x00200000; | |
766 return false; | |
767 } | |
768 | |
769 #ifndef PRODUCT | |
770 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
771 | |
772 // This should not need to be atomic as the only way for simultaneous | |
773 // updates is via interrupts. Even then this should be rare or non-existant | |
774 // and we don't care that much anyway. | |
775 | |
776 int index = _jmp_ring_index; | |
777 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
778 _jmp_ring[index]._target = (intptr_t) target; | |
779 _jmp_ring[index]._instruction = (intptr_t) instr; | |
780 _jmp_ring[index]._file = file; | |
781 _jmp_ring[index]._line = line; | |
782 } | |
783 #endif /* PRODUCT */ | |
784 | |
785 // Called by flat profiler | |
786 // Callers have already called wait_for_ext_suspend_completion | |
787 // The assertion for that is currently too complex to put here: | |
788 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
789 bool gotframe = false; | |
790 // self suspension saves needed state. | |
791 if (has_last_Java_frame() && _anchor.walkable()) { | |
792 *_fr = pd_last_frame(); | |
793 gotframe = true; | |
794 } | |
795 return gotframe; | |
796 } | |
797 | |
798 void Thread::interrupt(Thread* thread) { | |
799 trace("interrupt", thread); | |
800 debug_only(check_for_dangling_thread_pointer(thread);) | |
801 os::interrupt(thread); | |
802 } | |
803 | |
804 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
805 trace("is_interrupted", thread); | |
806 debug_only(check_for_dangling_thread_pointer(thread);) | |
807 // Note: If clear_interrupted==false, this simply fetches and | |
808 // returns the value of the field osthread()->interrupted(). | |
809 return os::is_interrupted(thread, clear_interrupted); | |
810 } | |
811 | |
812 | |
813 // GC Support | |
814 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
815 jint thread_parity = _oops_do_parity; | |
816 if (thread_parity != strong_roots_parity) { | |
817 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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818 if (res == thread_parity) { |
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819 return true; |
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820 } else { |
0 | 821 guarantee(res == strong_roots_parity, "Or else what?"); |
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822 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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823 "Should only fail when parallel."); |
0 | 824 return false; |
825 } | |
826 } | |
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827 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
0 | 828 "Should only fail when parallel."); |
829 return false; | |
830 } | |
831 | |
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832 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 833 active_handles()->oops_do(f); |
834 // Do oop for ThreadShadow | |
835 f->do_oop((oop*)&_pending_exception); | |
836 handle_area()->oops_do(f); | |
837 } | |
838 | |
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839 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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840 // no nmethods in a generic thread... |
0 | 841 } |
842 | |
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843 void Thread::metadata_do(void f(Metadata*)) { |
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844 if (metadata_handles() != NULL) { |
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845 for (int i = 0; i< metadata_handles()->length(); i++) { |
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846 f(metadata_handles()->at(i)); |
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847 } |
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848 } |
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849 } |
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850 |
0 | 851 void Thread::print_on(outputStream* st) const { |
852 // get_priority assumes osthread initialized | |
853 if (osthread() != NULL) { | |
6766 | 854 int os_prio; |
855 if (os::get_native_priority(this, &os_prio) == OS_OK) { | |
856 st->print("os_prio=%d ", os_prio); | |
857 } | |
858 st->print("tid=" INTPTR_FORMAT " ", this); | |
0 | 859 osthread()->print_on(st); |
860 } | |
861 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
862 } | |
863 | |
864 // Thread::print_on_error() is called by fatal error handler. Don't use | |
865 // any lock or allocate memory. | |
866 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
867 if (is_VM_thread()) st->print("VMThread"); | |
868 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
869 else if (is_Java_thread()) st->print("JavaThread"); | |
870 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
871 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
872 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
873 else st->print("Thread"); | |
874 | |
875 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
876 _stack_base - _stack_size, _stack_base); | |
877 | |
878 if (osthread()) { | |
879 st->print(" [id=%d]", osthread()->thread_id()); | |
880 } | |
881 } | |
882 | |
883 #ifdef ASSERT | |
884 void Thread::print_owned_locks_on(outputStream* st) const { | |
885 Monitor *cur = _owned_locks; | |
886 if (cur == NULL) { | |
887 st->print(" (no locks) "); | |
888 } else { | |
889 st->print_cr(" Locks owned:"); | |
890 while(cur) { | |
891 cur->print_on(st); | |
892 cur = cur->next(); | |
893 } | |
894 } | |
895 } | |
896 | |
897 static int ref_use_count = 0; | |
898 | |
899 bool Thread::owns_locks_but_compiled_lock() const { | |
900 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
901 if (cur != Compile_lock) return true; | |
902 } | |
903 return false; | |
904 } | |
905 | |
906 | |
907 #endif | |
908 | |
909 #ifndef PRODUCT | |
910 | |
911 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
912 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
913 // no threads which allow_vm_block's are held | |
914 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
915 // Check if current thread is allowed to block at a safepoint | |
916 if (!(_allow_safepoint_count == 0)) | |
917 fatal("Possible safepoint reached by thread that does not allow it"); | |
918 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
919 fatal("LEAF method calling lock?"); | |
920 } | |
921 | |
922 #ifdef ASSERT | |
923 if (potential_vm_operation && is_Java_thread() | |
924 && !Universe::is_bootstrapping()) { | |
925 // Make sure we do not hold any locks that the VM thread also uses. | |
926 // This could potentially lead to deadlocks | |
927 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
928 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
929 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
930 // since it is used to transfer control between JavaThreads and the VMThread | |
931 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
932 if ( (cur->allow_vm_block() && | |
933 cur != Threads_lock && | |
934 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
935 cur != VMOperationRequest_lock && | |
936 cur != VMOperationQueue_lock) || | |
937 cur->rank() == Mutex::special) { | |
938 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
939 } | |
940 } | |
941 } | |
942 | |
943 if (GCALotAtAllSafepoints) { | |
944 // We could enter a safepoint here and thus have a gc | |
945 InterfaceSupport::check_gc_alot(); | |
946 } | |
947 #endif | |
948 } | |
949 #endif | |
950 | |
951 bool Thread::is_in_stack(address adr) const { | |
952 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
953 address end = os::current_stack_pointer(); | |
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954 // Allow non Java threads to call this without stack_base |
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955 if (_stack_base == NULL) return true; |
0 | 956 if (stack_base() >= adr && adr >= end) return true; |
957 | |
958 return false; | |
959 } | |
960 | |
961 | |
962 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
963 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
964 // used for compilation in the future. If that change is made, the need for these methods | |
965 // should be revisited, and they should be removed if possible. | |
966 | |
967 bool Thread::is_lock_owned(address adr) const { | |
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968 return on_local_stack(adr); |
0 | 969 } |
970 | |
971 bool Thread::set_as_starting_thread() { | |
972 // NOTE: this must be called inside the main thread. | |
973 return os::create_main_thread((JavaThread*)this); | |
974 } | |
975 | |
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976 static void initialize_class(Symbol* class_name, TRAPS) { |
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977 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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978 InstanceKlass::cast(klass)->initialize(CHECK); |
0 | 979 } |
980 | |
981 | |
982 // Creates the initial ThreadGroup | |
983 static Handle create_initial_thread_group(TRAPS) { | |
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984 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
0 | 985 instanceKlassHandle klass (THREAD, k); |
986 | |
987 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
988 { | |
989 JavaValue result(T_VOID); | |
990 JavaCalls::call_special(&result, | |
991 system_instance, | |
992 klass, | |
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993 vmSymbols::object_initializer_name(), |
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994 vmSymbols::void_method_signature(), |
0 | 995 CHECK_NH); |
996 } | |
997 Universe::set_system_thread_group(system_instance()); | |
998 | |
999 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
1000 { | |
1001 JavaValue result(T_VOID); | |
1002 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
1003 JavaCalls::call_special(&result, | |
1004 main_instance, | |
1005 klass, | |
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1006 vmSymbols::object_initializer_name(), |
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1007 vmSymbols::threadgroup_string_void_signature(), |
0 | 1008 system_instance, |
1009 string, | |
1010 CHECK_NH); | |
1011 } | |
1012 return main_instance; | |
1013 } | |
1014 | |
1015 // Creates the initial Thread | |
1016 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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1017 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
0 | 1018 instanceKlassHandle klass (THREAD, k); |
1019 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
1020 | |
1021 java_lang_Thread::set_thread(thread_oop(), thread); | |
1022 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1023 thread->set_threadObj(thread_oop()); | |
1024 | |
1025 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
1026 | |
1027 JavaValue result(T_VOID); | |
1028 JavaCalls::call_special(&result, thread_oop, | |
1029 klass, | |
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1030 vmSymbols::object_initializer_name(), |
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1031 vmSymbols::threadgroup_string_void_signature(), |
0 | 1032 thread_group, |
1033 string, | |
1034 CHECK_NULL); | |
1035 return thread_oop(); | |
1036 } | |
1037 | |
1038 static void call_initializeSystemClass(TRAPS) { | |
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1039 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1040 instanceKlassHandle klass (THREAD, k); |
1041 | |
1042 JavaValue result(T_VOID); | |
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1043 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1044 vmSymbols::void_method_signature(), CHECK); |
0 | 1045 } |
1046 | |
6181 | 1047 char java_runtime_name[128] = ""; |
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1048 char java_runtime_version[128] = ""; |
6181 | 1049 |
1050 // extract the JRE name from sun.misc.Version.java_runtime_name | |
1051 static const char* get_java_runtime_name(TRAPS) { | |
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1052 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
6181 | 1053 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
1054 fieldDescriptor fd; | |
1055 bool found = k != NULL && | |
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1056 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
6181 | 1057 vmSymbols::string_signature(), &fd); |
1058 if (found) { | |
1059 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
1060 if (name_oop == NULL) | |
1061 return NULL; | |
1062 const char* name = java_lang_String::as_utf8_string(name_oop, | |
1063 java_runtime_name, | |
1064 sizeof(java_runtime_name)); | |
1065 return name; | |
1066 } else { | |
1067 return NULL; | |
1068 } | |
1069 } | |
1070 | |
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1071 // extract the JRE version from sun.misc.Version.java_runtime_version |
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1072 static const char* get_java_runtime_version(TRAPS) { |
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1073 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
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1074 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
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1075 fieldDescriptor fd; |
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1076 bool found = k != NULL && |
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1077 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_version_name(), |
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1078 vmSymbols::string_signature(), &fd); |
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1079 if (found) { |
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1080 oop name_oop = k->java_mirror()->obj_field(fd.offset()); |
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1081 if (name_oop == NULL) |
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1082 return NULL; |
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1083 const char* name = java_lang_String::as_utf8_string(name_oop, |
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1084 java_runtime_version, |
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1085 sizeof(java_runtime_version)); |
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1086 return name; |
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1087 } else { |
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1088 return NULL; |
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1089 } |
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1090 } |
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1091 |
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1092 // General purpose hook into Java code, run once when the VM is initialized. |
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1093 // The Java library method itself may be changed independently from the VM. |
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1094 static void call_postVMInitHook(TRAPS) { |
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1095 Klass* k = SystemDictionary::PostVMInitHook_klass(); |
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1096 instanceKlassHandle klass (THREAD, k); |
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1097 if (klass.not_null()) { |
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1098 JavaValue result(T_VOID); |
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1099 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1100 vmSymbols::void_method_signature(), |
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1101 CHECK); |
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1102 } |
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1103 } |
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1104 |
0 | 1105 static void reset_vm_info_property(TRAPS) { |
1106 // the vm info string | |
1107 ResourceMark rm(THREAD); | |
1108 const char *vm_info = VM_Version::vm_info_string(); | |
1109 | |
1110 // java.lang.System class | |
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1111 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1112 instanceKlassHandle klass (THREAD, k); |
1113 | |
1114 // setProperty arguments | |
1115 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
1116 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
1117 | |
1118 // return value | |
1119 JavaValue r(T_OBJECT); | |
1120 | |
1121 // public static String setProperty(String key, String value); | |
1122 JavaCalls::call_static(&r, | |
1123 klass, | |
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1124 vmSymbols::setProperty_name(), |
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1125 vmSymbols::string_string_string_signature(), |
0 | 1126 key_str, |
1127 value_str, | |
1128 CHECK); | |
1129 } | |
1130 | |
1131 | |
1132 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
1133 assert(thread_group.not_null(), "thread group should be specified"); | |
1134 assert(threadObj() == NULL, "should only create Java thread object once"); | |
1135 | |
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1136 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 1137 instanceKlassHandle klass (THREAD, k); |
1138 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
1139 | |
1140 java_lang_Thread::set_thread(thread_oop(), this); | |
1141 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1142 set_threadObj(thread_oop()); | |
1143 | |
1144 JavaValue result(T_VOID); | |
1145 if (thread_name != NULL) { | |
1146 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
1147 // Thread gets assigned specified name and null target | |
1148 JavaCalls::call_special(&result, | |
1149 thread_oop, | |
1150 klass, | |
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1151 vmSymbols::object_initializer_name(), |
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1152 vmSymbols::threadgroup_string_void_signature(), |
0 | 1153 thread_group, // Argument 1 |
1154 name, // Argument 2 | |
1155 THREAD); | |
1156 } else { | |
1157 // Thread gets assigned name "Thread-nnn" and null target | |
1158 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
1159 JavaCalls::call_special(&result, | |
1160 thread_oop, | |
1161 klass, | |
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1162 vmSymbols::object_initializer_name(), |
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1163 vmSymbols::threadgroup_runnable_void_signature(), |
0 | 1164 thread_group, // Argument 1 |
1165 Handle(), // Argument 2 | |
1166 THREAD); | |
1167 } | |
1168 | |
1169 | |
1170 if (daemon) { | |
1171 java_lang_Thread::set_daemon(thread_oop()); | |
1172 } | |
1173 | |
1174 if (HAS_PENDING_EXCEPTION) { | |
1175 return; | |
1176 } | |
1177 | |
1142 | 1178 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
0 | 1179 Handle threadObj(this, this->threadObj()); |
1180 | |
1181 JavaCalls::call_special(&result, | |
1182 thread_group, | |
1183 group, | |
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1184 vmSymbols::add_method_name(), |
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1185 vmSymbols::thread_void_signature(), |
0 | 1186 threadObj, // Arg 1 |
1187 THREAD); | |
1188 | |
1189 | |
1190 } | |
1191 | |
1192 // NamedThread -- non-JavaThread subclasses with multiple | |
1193 // uniquely named instances should derive from this. | |
1194 NamedThread::NamedThread() : Thread() { | |
1195 _name = NULL; | |
1119
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1196 _processed_thread = NULL; |
0 | 1197 } |
1198 | |
1199 NamedThread::~NamedThread() { | |
1200 if (_name != NULL) { | |
6197 | 1201 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
0 | 1202 _name = NULL; |
1203 } | |
1204 } | |
1205 | |
1206 void NamedThread::set_name(const char* format, ...) { | |
1207 guarantee(_name == NULL, "Only get to set name once."); | |
6197 | 1208 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
0 | 1209 guarantee(_name != NULL, "alloc failure"); |
1210 va_list ap; | |
1211 va_start(ap, format); | |
1212 jio_vsnprintf(_name, max_name_len, format, ap); | |
1213 va_end(ap); | |
1214 } | |
1215 | |
1216 // ======= WatcherThread ======== | |
1217 | |
1218 // The watcher thread exists to simulate timer interrupts. It should | |
1219 // be replaced by an abstraction over whatever native support for | |
1220 // timer interrupts exists on the platform. | |
1221 | |
1222 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
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1223 bool WatcherThread::_startable = false; |
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1224 volatile bool WatcherThread::_should_terminate = false; |
0 | 1225 |
1226 WatcherThread::WatcherThread() : Thread() { | |
1227 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
1228 if (os::create_thread(this, os::watcher_thread)) { | |
1229 _watcher_thread = this; | |
1230 | |
1231 // Set the watcher thread to the highest OS priority which should not be | |
1232 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1233 // is created. The only normal thread using this priority is the reference | |
1234 // handler thread, which runs for very short intervals only. | |
1235 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1236 // will be inaccurate. | |
1237 os::set_priority(this, MaxPriority); | |
1238 if (!DisableStartThread) { | |
1239 os::start_thread(this); | |
1240 } | |
1241 } | |
1242 } | |
1243 | |
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1244 int WatcherThread::sleep() const { |
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1245 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1246 |
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1247 // remaining will be zero if there are no tasks, |
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1248 // causing the WatcherThread to sleep until a task is |
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1249 // enrolled |
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1250 int remaining = PeriodicTask::time_to_wait(); |
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1251 int time_slept = 0; |
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1252 |
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1253 // we expect this to timeout - we only ever get unparked when |
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1254 // we should terminate or when a new task has been enrolled |
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1255 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1256 |
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1257 jlong time_before_loop = os::javaTimeNanos(); |
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1258 |
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1259 for (;;) { |
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1260 bool timedout = PeriodicTask_lock->wait(Mutex::_no_safepoint_check_flag, remaining); |
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1261 jlong now = os::javaTimeNanos(); |
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1262 |
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1263 if (remaining == 0) { |
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1264 // if we didn't have any tasks we could have waited for a long time |
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1265 // consider the time_slept zero and reset time_before_loop |
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1266 time_slept = 0; |
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1267 time_before_loop = now; |
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1268 } else { |
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1269 // need to recalulate since we might have new tasks in _tasks |
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1270 time_slept = (int) ((now - time_before_loop) / 1000000); |
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1271 } |
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1272 |
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1273 // Change to task list or spurious wakeup of some kind |
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1274 if (timedout || _should_terminate) { |
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1275 break; |
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1276 } |
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1277 |
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1278 remaining = PeriodicTask::time_to_wait(); |
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1279 if (remaining == 0) { |
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1280 // Last task was just disenrolled so loop around and wait until |
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1281 // another task gets enrolled |
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1282 continue; |
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1283 } |
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1284 |
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1285 remaining -= time_slept; |
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1286 if (remaining <= 0) |
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1287 break; |
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1288 } |
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1289 |
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1290 return time_slept; |
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1291 } |
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1292 |
0 | 1293 void WatcherThread::run() { |
1294 assert(this == watcher_thread(), "just checking"); | |
1295 | |
1296 this->record_stack_base_and_size(); | |
1297 this->initialize_thread_local_storage(); | |
1298 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1299 while(!_should_terminate) { | |
1300 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1301 assert(watcher_thread() == this, "thread consistency check"); | |
1302 | |
1303 // Calculate how long it'll be until the next PeriodicTask work | |
1304 // should be done, and sleep that amount of time. | |
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1305 int time_waited = sleep(); |
0 | 1306 |
1307 if (is_error_reported()) { | |
1308 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1309 // should abort JVM after creating an error log file. However in some | |
1310 // rare cases, the error handler itself might deadlock. Here we try to | |
1311 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1312 // | |
1313 // This code is in WatcherThread because WatcherThread wakes up | |
1314 // periodically so the fatal error handler doesn't need to do anything; | |
1315 // also because the WatcherThread is less likely to crash than other | |
1316 // threads. | |
1317 | |
1318 for (;;) { | |
1319 if (!ShowMessageBoxOnError | |
1320 && (OnError == NULL || OnError[0] == '\0') | |
1321 && Arguments::abort_hook() == NULL) { | |
1322 os::sleep(this, 2 * 60 * 1000, false); | |
1323 fdStream err(defaultStream::output_fd()); | |
1324 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1325 // skip atexit/vm_exit/vm_abort hooks | |
1326 os::die(); | |
1327 } | |
1328 | |
1329 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1330 // ShowMessageBoxOnError when it is ready to abort. | |
1331 os::sleep(this, 5 * 1000, false); | |
1332 } | |
1333 } | |
1334 | |
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1335 PeriodicTask::real_time_tick(time_waited); |
0 | 1336 } |
1337 | |
1338 // Signal that it is terminated | |
1339 { | |
1340 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1341 _watcher_thread = NULL; | |
1342 Terminator_lock->notify(); | |
1343 } | |
1344 | |
1345 // Thread destructor usually does this.. | |
1346 ThreadLocalStorage::set_thread(NULL); | |
1347 } | |
1348 | |
1349 void WatcherThread::start() { | |
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1350 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1351 |
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1352 if (watcher_thread() == NULL && _startable) { |
0 | 1353 _should_terminate = false; |
1354 // Create the single instance of WatcherThread | |
1355 new WatcherThread(); | |
1356 } | |
1357 } | |
1358 | |
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1359 void WatcherThread::make_startable() { |
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1360 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1361 _startable = true; |
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1362 } |
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1363 |
0 | 1364 void WatcherThread::stop() { |
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1365 { |
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1366 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1367 _should_terminate = true; |
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1368 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1369 |
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1370 WatcherThread* watcher = watcher_thread(); |
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1371 if (watcher != NULL) |
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1372 watcher->unpark(); |
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1373 } |
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1374 |
0 | 1375 // it is ok to take late safepoints here, if needed |
1376 MutexLocker mu(Terminator_lock); | |
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1377 |
0 | 1378 while(watcher_thread() != NULL) { |
1379 // This wait should make safepoint checks, wait without a timeout, | |
1380 // and wait as a suspend-equivalent condition. | |
1381 // | |
1382 // Note: If the FlatProfiler is running, then this thread is waiting | |
1383 // for the WatcherThread to terminate and the WatcherThread, via the | |
1384 // FlatProfiler task, is waiting for the external suspend request on | |
1385 // this thread to complete. wait_for_ext_suspend_completion() will | |
1386 // eventually timeout, but that takes time. Making this wait a | |
1387 // suspend-equivalent condition solves that timeout problem. | |
1388 // | |
1389 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1390 Mutex::_as_suspend_equivalent_flag); | |
1391 } | |
1392 } | |
1393 | |
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1394 void WatcherThread::unpark() { |
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1395 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1396 PeriodicTask_lock->notify(); |
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1397 } |
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1398 |
0 | 1399 void WatcherThread::print_on(outputStream* st) const { |
1400 st->print("\"%s\" ", name()); | |
1401 Thread::print_on(st); | |
1402 st->cr(); | |
1403 } | |
1404 | |
1405 // ======= JavaThread ======== | |
1406 | |
1407 // A JavaThread is a normal Java thread | |
1408 | |
1409 void JavaThread::initialize() { | |
1410 // Initialize fields | |
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1411 |
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1412 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1413 set_claimed_par_id(-1); |
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1414 |
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1415 _env = NULL; |
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1416 _buffer_blob = NULL; |
0 | 1417 set_saved_exception_pc(NULL); |
1418 set_threadObj(NULL); | |
1419 _anchor.clear(); | |
1420 set_entry_point(NULL); | |
1421 set_jni_functions(jni_functions()); | |
1422 set_callee_target(NULL); | |
1423 set_vm_result(NULL); | |
1424 set_vm_result_2(NULL); | |
1425 set_vframe_array_head(NULL); | |
1426 set_vframe_array_last(NULL); | |
1427 set_deferred_locals(NULL); | |
1428 set_deopt_mark(NULL); | |
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1429 set_deopt_nmethod(NULL); |
0 | 1430 clear_must_deopt_id(); |
1431 set_monitor_chunks(NULL); | |
1432 set_next(NULL); | |
1433 set_thread_state(_thread_new); | |
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1434 #if INCLUDE_NMT |
6197 | 1435 set_recorder(NULL); |
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1436 #endif |
0 | 1437 _terminated = _not_terminated; |
1438 _privileged_stack_top = NULL; | |
1439 _array_for_gc = NULL; | |
1440 _suspend_equivalent = false; | |
1441 _in_deopt_handler = 0; | |
1442 _doing_unsafe_access = false; | |
1443 _stack_guard_state = stack_guard_unused; | |
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1444 #ifdef GRAAL |
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Lukas Stadler <lukas.stadler@jku.at>
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1445 _graal_deopt_info = NULL; |
4993
897b7d18bebc
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diff
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|
1446 _graal_alternate_call_target = NULL; |
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679e6584c177
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Doug Simon <doug.simon@oracle.com>
parents:
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1447 _debug_scope = NULL; |
5747
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|
1448 #endif |
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|
1449 #ifdef HIGH_LEVEL_INTERPRETER |
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diff
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|
1450 _high_level_interpreter_in_vm = false; |
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diff
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|
1451 #endif |
0 | 1452 _exception_oop = NULL; |
1453 _exception_pc = 0; | |
1454 _exception_handler_pc = 0; | |
1903 | 1455 _is_method_handle_return = 0; |
0 | 1456 _jvmti_thread_state= NULL; |
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diff
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|
1457 _should_post_on_exceptions_flag = JNI_FALSE; |
0 | 1458 _jvmti_get_loaded_classes_closure = NULL; |
1459 _interp_only_mode = 0; | |
1460 _special_runtime_exit_condition = _no_async_condition; | |
1461 _pending_async_exception = NULL; | |
1462 _is_compiling = false; | |
1463 _thread_stat = NULL; | |
1464 _thread_stat = new ThreadStatistics(); | |
1465 _blocked_on_compilation = false; | |
1466 _jni_active_critical = 0; | |
1467 _do_not_unlock_if_synchronized = false; | |
1468 _cached_monitor_info = NULL; | |
1469 _parker = Parker::Allocate(this) ; | |
3696
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
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|
1470 _scanned_nmethod = NULL; |
0 | 1471 |
1472 #ifndef PRODUCT | |
1473 _jmp_ring_index = 0; | |
1474 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1475 record_jump(NULL, NULL, NULL, 0); | |
1476 } | |
1477 #endif /* PRODUCT */ | |
1478 | |
1479 set_thread_profiler(NULL); | |
1480 if (FlatProfiler::is_active()) { | |
1481 // This is where we would decide to either give each thread it's own profiler | |
1482 // or use one global one from FlatProfiler, | |
1483 // or up to some count of the number of profiled threads, etc. | |
1484 ThreadProfiler* pp = new ThreadProfiler(); | |
1485 pp->engage(); | |
1486 set_thread_profiler(pp); | |
1487 } | |
1488 | |
1489 // Setup safepoint state info for this thread | |
1490 ThreadSafepointState::create(this); | |
1491 | |
1492 debug_only(_java_call_counter = 0); | |
1493 | |
1494 // JVMTI PopFrame support | |
1495 _popframe_condition = popframe_inactive; | |
1496 _popframe_preserved_args = NULL; | |
1497 _popframe_preserved_args_size = 0; | |
1498 | |
1499 pd_initialize(); | |
1500 } | |
1501 | |
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1502 #ifndef SERIALGC |
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|
1503 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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|
1504 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
37f87013dfd8
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diff
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|
1505 #endif // !SERIALGC |
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|
1506 |
4006 | 1507 JavaThread::JavaThread(bool is_attaching_via_jni) : |
342
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1508 Thread() |
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|
1509 #ifndef SERIALGC |
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|
1510 , _satb_mark_queue(&_satb_mark_queue_set), |
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|
1511 _dirty_card_queue(&_dirty_card_queue_set) |
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|
1512 #endif // !SERIALGC |
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|
1513 { |
0 | 1514 initialize(); |
4006 | 1515 if (is_attaching_via_jni) { |
1516 _jni_attach_state = _attaching_via_jni; | |
1517 } else { | |
1518 _jni_attach_state = _not_attaching_via_jni; | |
1519 } | |
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|
1520 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
6197 | 1521 _safepoint_visible = false; |
0 | 1522 } |
1523 | |
1524 bool JavaThread::reguard_stack(address cur_sp) { | |
1525 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1526 return true; // Stack already guarded or guard pages not needed. | |
1527 } | |
1528 | |
1529 if (register_stack_overflow()) { | |
1530 // For those architectures which have separate register and | |
1531 // memory stacks, we must check the register stack to see if | |
1532 // it has overflowed. | |
1533 return false; | |
1534 } | |
1535 | |
1536 // Java code never executes within the yellow zone: the latter is only | |
1537 // there to provoke an exception during stack banging. If java code | |
1538 // is executing there, either StackShadowPages should be larger, or | |
1539 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1540 // when it should. | |
1541 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1542 | |
1543 enable_stack_yellow_zone(); | |
1544 return true; | |
1545 } | |
1546 | |
1547 bool JavaThread::reguard_stack(void) { | |
1548 return reguard_stack(os::current_stack_pointer()); | |
1549 } | |
1550 | |
1551 | |
1552 void JavaThread::block_if_vm_exited() { | |
1553 if (_terminated == _vm_exited) { | |
1554 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1555 // we will block here forever | |
1556 Threads_lock->lock_without_safepoint_check(); | |
1557 ShouldNotReachHere(); | |
1558 } | |
1559 } | |
1560 | |
1561 | |
1562 // Remove this ifdef when C1 is ported to the compiler interface. | |
1563 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1564 | |
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1565 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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|
1566 Thread() |
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|
1567 #ifndef SERIALGC |
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|
1568 , _satb_mark_queue(&_satb_mark_queue_set), |
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|
1569 _dirty_card_queue(&_dirty_card_queue_set) |
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|
1570 #endif // !SERIALGC |
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|
1571 { |
0 | 1572 if (TraceThreadEvents) { |
1573 tty->print_cr("creating thread %p", this); | |
1574 } | |
1575 initialize(); | |
4006 | 1576 _jni_attach_state = _not_attaching_via_jni; |
0 | 1577 set_entry_point(entry_point); |
1578 // Create the native thread itself. | |
1579 // %note runtime_23 | |
1580 os::ThreadType thr_type = os::java_thread; | |
1581 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1582 os::java_thread; | |
1583 os::create_thread(this, thr_type, stack_sz); | |
6197 | 1584 _safepoint_visible = false; |
0 | 1585 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
1586 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1587 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1588 // the exception consists of creating the exception object & initializing it, initialization | |
1589 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1590 // | |
1591 // The thread is still suspended when we reach here. Thread must be explicit started | |
1592 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1593 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1594 // object must be fully initialized (take a look at JVM_Start) | |
1595 } | |
1596 | |
1597 JavaThread::~JavaThread() { | |
1598 if (TraceThreadEvents) { | |
1599 tty->print_cr("terminate thread %p", this); | |
1600 } | |
1601 | |
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
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diff
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|
1602 // By now, this thread should already be invisible to safepoint, |
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
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diff
changeset
|
1603 // and its per-thread recorder also collected. |
6197 | 1604 assert(!is_safepoint_visible(), "wrong state"); |
6882
716c64bda5ba
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|
1605 #if INCLUDE_NMT |
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
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6872
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|
1606 assert(get_recorder() == NULL, "Already collected"); |
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6872
diff
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|
1607 #endif // INCLUDE_NMT |
6197 | 1608 |
0 | 1609 // JSR166 -- return the parker to the free list |
1610 Parker::Release(_parker); | |
1611 _parker = NULL ; | |
1612 | |
1613 // Free any remaining previous UnrollBlock | |
1614 vframeArray* old_array = vframe_array_last(); | |
1615 | |
1616 if (old_array != NULL) { | |
1617 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1618 old_array->set_unroll_block(NULL); | |
1619 delete old_info; | |
1620 delete old_array; | |
1621 } | |
1622 | |
1623 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1624 if (deferred != NULL) { | |
1625 // This can only happen if thread is destroyed before deoptimization occurs. | |
1626 assert(deferred->length() != 0, "empty array!"); | |
1627 do { | |
1628 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1629 deferred->remove_at(0); | |
1630 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1631 delete dlv; | |
1632 } while (deferred->length() != 0); | |
1633 delete deferred; | |
1634 } | |
1635 | |
1636 // All Java related clean up happens in exit | |
1637 ThreadSafepointState::destroy(this); | |
1638 if (_thread_profiler != NULL) delete _thread_profiler; | |
1639 if (_thread_stat != NULL) delete _thread_stat; | |
1640 } | |
1641 | |
1642 | |
1643 // The first routine called by a new Java thread | |
1644 void JavaThread::run() { | |
1645 // initialize thread-local alloc buffer related fields | |
1646 this->initialize_tlab(); | |
1647 | |
1648 // used to test validitity of stack trace backs | |
1649 this->record_base_of_stack_pointer(); | |
1650 | |
1651 // Record real stack base and size. | |
1652 this->record_stack_base_and_size(); | |
1653 | |
1654 // Initialize thread local storage; set before calling MutexLocker | |
1655 this->initialize_thread_local_storage(); | |
1656 | |
1657 this->create_stack_guard_pages(); | |
1658 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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1608
diff
changeset
|
1659 this->cache_global_variables(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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1608
diff
changeset
|
1660 |
0 | 1661 // Thread is now sufficient initialized to be handled by the safepoint code as being |
1662 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1663 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1664 | |
1665 assert(JavaThread::current() == this, "sanity check"); | |
1666 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1667 | |
1668 DTRACE_THREAD_PROBE(start, this); | |
1669 | |
1670 // This operation might block. We call that after all safepoint checks for a new thread has | |
1671 // been completed. | |
1672 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1673 | |
1674 if (JvmtiExport::should_post_thread_life()) { | |
1675 JvmtiExport::post_thread_start(this); | |
1676 } | |
1677 | |
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
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4095
diff
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|
1678 EVENT_BEGIN(TraceEventThreadStart, event); |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
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4095
diff
changeset
|
1679 EVENT_COMMIT(event, |
94ec88ca68e2
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parents:
4095
diff
changeset
|
1680 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
94ec88ca68e2
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4095
diff
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|
1681 |
0 | 1682 // We call another function to do the rest so we are sure that the stack addresses used |
1683 // from there will be lower than the stack base just computed | |
1684 thread_main_inner(); | |
1685 | |
1686 // Note, thread is no longer valid at this point! | |
1687 } | |
1688 | |
1689 | |
1690 void JavaThread::thread_main_inner() { | |
1691 assert(JavaThread::current() == this, "sanity check"); | |
1692 assert(this->threadObj() != NULL, "just checking"); | |
1693 | |
2162
ccfcb502af3f
6566340: Restore use of stillborn flag to signify a thread that was stopped before it started
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diff
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|
1694 // Execute thread entry point unless this thread has a pending exception |
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|
1695 // or has been stopped before starting. |
0 | 1696 // Note: Due to JVM_StopThread we can have pending exceptions already! |
2162
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|
1697 if (!this->has_pending_exception() && |
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|
1698 !java_lang_Thread::is_stillborn(this->threadObj())) { |
4006 | 1699 { |
1700 ResourceMark rm(this); | |
1701 this->set_native_thread_name(this->get_thread_name()); | |
1702 } | |
0 | 1703 HandleMark hm(this); |
1704 this->entry_point()(this, this); | |
1705 } | |
1706 | |
1707 DTRACE_THREAD_PROBE(stop, this); | |
1708 | |
1709 this->exit(false); | |
1710 delete this; | |
1711 } | |
1712 | |
1713 | |
1714 static void ensure_join(JavaThread* thread) { | |
1715 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1716 Handle threadObj(thread, thread->threadObj()); | |
1717 assert(threadObj.not_null(), "java thread object must exist"); | |
1718 ObjectLocker lock(threadObj, thread); | |
1719 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1720 thread->clear_pending_exception(); | |
1721 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1722 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
2162
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|
1723 // Clear the native thread instance - this makes isAlive return false and allows the join() |
ccfcb502af3f
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|
1724 // to complete once we've done the notify_all below |
0 | 1725 java_lang_Thread::set_thread(threadObj(), NULL); |
1726 lock.notify_all(thread); | |
1727 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1728 thread->clear_pending_exception(); | |
1729 } | |
1730 | |
441
da9cb4e97a5f
6770608: G1: Mutator thread can flush barrier and satb queues during safepoint
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383
diff
changeset
|
1731 |
0 | 1732 // For any new cleanup additions, please check to see if they need to be applied to |
1733 // cleanup_failed_attach_current_thread as well. | |
1734 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
1735 assert(this == JavaThread::current(), "thread consistency check"); | |
1736 if (!InitializeJavaLangSystem) return; | |
1737 | |
1738 HandleMark hm(this); | |
1739 Handle uncaught_exception(this, this->pending_exception()); | |
1740 this->clear_pending_exception(); | |
1741 Handle threadObj(this, this->threadObj()); | |
1742 assert(threadObj.not_null(), "Java thread object should be created"); | |
1743 | |
1744 if (get_thread_profiler() != NULL) { | |
1745 get_thread_profiler()->disengage(); | |
1746 ResourceMark rm; | |
1747 get_thread_profiler()->print(get_thread_name()); | |
1748 } | |
1749 | |
1750 | |
1751 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
1752 { | |
1753 EXCEPTION_MARK; | |
1754 | |
1755 CLEAR_PENDING_EXCEPTION; | |
1756 } | |
1757 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
1758 // has to be fixed by a runtime query method | |
1759 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
1760 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
1761 // java.lang.Thread.dispatchUncaughtException | |
1762 if (uncaught_exception.not_null()) { | |
1763 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
1764 { | |
1765 EXCEPTION_MARK; | |
1766 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
1767 // call it. Otherwise we have an older library without the JSR-166 changes, | |
1768 // so call ThreadGroup.uncaughtException() | |
1769 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
1770 CallInfo callinfo; | |
1142 | 1771 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1772 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
2177
3582bf76420e
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|
1773 vmSymbols::dispatchUncaughtException_name(), |
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6990754: Use native memory and reference counting to implement SymbolTable
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diff
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|
1774 vmSymbols::throwable_void_signature(), |
0 | 1775 KlassHandle(), false, false, THREAD); |
1776 CLEAR_PENDING_EXCEPTION; | |
1777 methodHandle method = callinfo.selected_method(); | |
1778 if (method.not_null()) { | |
1779 JavaValue result(T_VOID); | |
1780 JavaCalls::call_virtual(&result, | |
1781 threadObj, thread_klass, | |
2177
3582bf76420e
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|
1782 vmSymbols::dispatchUncaughtException_name(), |
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diff
changeset
|
1783 vmSymbols::throwable_void_signature(), |
0 | 1784 uncaught_exception, |
1785 THREAD); | |
1786 } else { | |
1142 | 1787 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 1788 JavaValue result(T_VOID); |
1789 JavaCalls::call_virtual(&result, | |
1790 group, thread_group, | |
2177
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|
1791 vmSymbols::uncaughtException_name(), |
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changeset
|
1792 vmSymbols::thread_throwable_void_signature(), |
0 | 1793 threadObj, // Arg 1 |
1794 uncaught_exception, // Arg 2 | |
1795 THREAD); | |
1796 } | |
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fb539912d338
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2177
diff
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|
1797 if (HAS_PENDING_EXCEPTION) { |
fb539912d338
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2177
diff
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|
1798 ResourceMark rm(this); |
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1799 jio_fprintf(defaultStream::error_stream(), |
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1800 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1801 " in thread \"%s\"\n", |
6983 | 1802 pending_exception()->klass()->external_name(), |
2200
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1803 get_thread_name()); |
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1804 CLEAR_PENDING_EXCEPTION; |
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1805 } |
0 | 1806 } |
1807 } | |
1808 | |
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1809 // Called before the java thread exit since we want to read info |
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1810 // from java_lang_Thread object |
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1811 EVENT_BEGIN(TraceEventThreadEnd, event); |
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1812 EVENT_COMMIT(event, |
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1813 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1814 |
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1815 // Call after last event on thread |
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1816 EVENT_THREAD_EXIT(this); |
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1817 |
0 | 1818 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
1819 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1820 // is deprecated anyhow. | |
1821 { int count = 3; | |
1822 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
1823 EXCEPTION_MARK; | |
1824 JavaValue result(T_VOID); | |
1142 | 1825 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1826 JavaCalls::call_virtual(&result, |
1827 threadObj, thread_klass, | |
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1828 vmSymbols::exit_method_name(), |
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1829 vmSymbols::void_method_signature(), |
0 | 1830 THREAD); |
1831 CLEAR_PENDING_EXCEPTION; | |
1832 } | |
1833 } | |
1834 | |
1835 // notify JVMTI | |
1836 if (JvmtiExport::should_post_thread_life()) { | |
1837 JvmtiExport::post_thread_end(this); | |
1838 } | |
1839 | |
1840 // We have notified the agents that we are exiting, before we go on, | |
1841 // we must check for a pending external suspend request and honor it | |
1842 // in order to not surprise the thread that made the suspend request. | |
1843 while (true) { | |
1844 { | |
1845 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1846 if (!is_external_suspend()) { | |
1847 set_terminated(_thread_exiting); | |
1848 ThreadService::current_thread_exiting(this); | |
1849 break; | |
1850 } | |
1851 // Implied else: | |
1852 // Things get a little tricky here. We have a pending external | |
1853 // suspend request, but we are holding the SR_lock so we | |
1854 // can't just self-suspend. So we temporarily drop the lock | |
1855 // and then self-suspend. | |
1856 } | |
1857 | |
1858 ThreadBlockInVM tbivm(this); | |
1859 java_suspend_self(); | |
1860 | |
1861 // We're done with this suspend request, but we have to loop around | |
1862 // and check again. Eventually we will get SR_lock without a pending | |
1863 // external suspend request and will be able to mark ourselves as | |
1864 // exiting. | |
1865 } | |
1866 // no more external suspends are allowed at this point | |
1867 } else { | |
1868 // before_exit() has already posted JVMTI THREAD_END events | |
1869 } | |
1870 | |
1871 // Notify waiters on thread object. This has to be done after exit() is called | |
1872 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1873 // group should have the destroyed bit set before waiters are notified). | |
1874 ensure_join(this); | |
1875 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1876 | |
1877 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1878 // held by this thread must be released. A detach operation must only | |
1879 // get here if there are no Java frames on the stack. Therefore, any | |
1880 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1881 // pre-inflated and in the monitor cache. | |
1882 // | |
1883 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1884 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1885 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1886 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1887 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1888 } | |
1889 | |
1890 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1891 // is in a consistent state, in case GC happens | |
1892 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1893 | |
1894 if (active_handles() != NULL) { | |
1895 JNIHandleBlock* block = active_handles(); | |
1896 set_active_handles(NULL); | |
1897 JNIHandleBlock::release_block(block); | |
1898 } | |
1899 | |
1900 if (free_handle_block() != NULL) { | |
1901 JNIHandleBlock* block = free_handle_block(); | |
1902 set_free_handle_block(NULL); | |
1903 JNIHandleBlock::release_block(block); | |
1904 } | |
1905 | |
1906 // These have to be removed while this is still a valid thread. | |
1907 remove_stack_guard_pages(); | |
1908 | |
1909 if (UseTLAB) { | |
1910 tlab().make_parsable(true); // retire TLAB | |
1911 } | |
1912 | |
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1913 if (JvmtiEnv::environments_might_exist()) { |
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1914 JvmtiExport::cleanup_thread(this); |
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1915 } |
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1916 |
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1917 #ifndef SERIALGC |
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1918 // We must flush G1-related buffers before removing a thread from |
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1919 // the list of active threads. |
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1920 if (UseG1GC) { |
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1921 flush_barrier_queues(); |
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1922 } |
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1923 #endif |
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1924 |
0 | 1925 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1926 Threads::remove(this); | |
1927 } | |
1928 | |
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1929 #ifndef SERIALGC |
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1930 // Flush G1-related queues. |
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1931 void JavaThread::flush_barrier_queues() { |
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1932 satb_mark_queue().flush(); |
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1933 dirty_card_queue().flush(); |
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1934 } |
1842
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1935 |
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1936 void JavaThread::initialize_queues() { |
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1937 assert(!SafepointSynchronize::is_at_safepoint(), |
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1938 "we should not be at a safepoint"); |
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1939 |
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1940 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1941 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1942 // The SATB queue should have been constructed with its active |
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1943 // field set to false. |
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1944 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1945 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1946 // If we are creating the thread during a marking cycle, we should |
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1947 // set the active field of the SATB queue to true. |
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1948 if (satb_queue_set.is_active()) { |
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1949 satb_queue.set_active(true); |
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1950 } |
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1951 |
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1952 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1953 // The dirty card queue should have been constructed with its |
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1954 // active field set to true. |
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1955 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1956 } |
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1957 #endif // !SERIALGC |
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1958 |
0 | 1959 void JavaThread::cleanup_failed_attach_current_thread() { |
441
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1960 if (get_thread_profiler() != NULL) { |
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1961 get_thread_profiler()->disengage(); |
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1962 ResourceMark rm; |
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1963 get_thread_profiler()->print(get_thread_name()); |
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1964 } |
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1965 |
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1966 if (active_handles() != NULL) { |
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1967 JNIHandleBlock* block = active_handles(); |
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1968 set_active_handles(NULL); |
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1969 JNIHandleBlock::release_block(block); |
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1970 } |
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1971 |
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1972 if (free_handle_block() != NULL) { |
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1973 JNIHandleBlock* block = free_handle_block(); |
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1974 set_free_handle_block(NULL); |
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1975 JNIHandleBlock::release_block(block); |
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1976 } |
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1977 |
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1978 // These have to be removed while this is still a valid thread. |
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1979 remove_stack_guard_pages(); |
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1980 |
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1981 if (UseTLAB) { |
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1982 tlab().make_parsable(true); // retire TLAB, if any |
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1983 } |
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1984 |
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1985 #ifndef SERIALGC |
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1986 if (UseG1GC) { |
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1987 flush_barrier_queues(); |
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1988 } |
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1989 #endif |
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1990 |
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1991 Threads::remove(this); |
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1992 delete this; |
0 | 1993 } |
1994 | |
1995 | |
441
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1996 |
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1997 |
0 | 1998 JavaThread* JavaThread::active() { |
1999 Thread* thread = ThreadLocalStorage::thread(); | |
2000 assert(thread != NULL, "just checking"); | |
2001 if (thread->is_Java_thread()) { | |
2002 return (JavaThread*) thread; | |
2003 } else { | |
2004 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
2005 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
2006 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
2007 assert(ret->is_Java_thread(), "must be a Java thread"); | |
2008 return ret; | |
2009 } | |
2010 } | |
2011 | |
2012 bool JavaThread::is_lock_owned(address adr) const { | |
702
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6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
2013 if (Thread::is_lock_owned(adr)) return true; |
0 | 2014 |
2015 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2016 if (chunk->contains(adr)) return true; | |
2017 } | |
2018 | |
2019 return false; | |
2020 } | |
2021 | |
2022 | |
2023 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
2024 chunk->set_next(monitor_chunks()); | |
2025 set_monitor_chunks(chunk); | |
2026 } | |
2027 | |
2028 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
2029 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
2030 if (monitor_chunks() == chunk) { | |
2031 set_monitor_chunks(chunk->next()); | |
2032 } else { | |
2033 MonitorChunk* prev = monitor_chunks(); | |
2034 while (prev->next() != chunk) prev = prev->next(); | |
2035 prev->set_next(chunk->next()); | |
2036 } | |
2037 } | |
2038 | |
2039 // JVM support. | |
2040 | |
2041 // Note: this function shouldn't block if it's called in | |
2042 // _thread_in_native_trans state (such as from | |
2043 // check_special_condition_for_native_trans()). | |
2044 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
2045 | |
2046 if (has_last_Java_frame() && has_async_condition()) { | |
2047 // If we are at a polling page safepoint (not a poll return) | |
2048 // then we must defer async exception because live registers | |
2049 // will be clobbered by the exception path. Poll return is | |
2050 // ok because the call we a returning from already collides | |
2051 // with exception handling registers and so there is no issue. | |
2052 // (The exception handling path kills call result registers but | |
2053 // this is ok since the exception kills the result anyway). | |
2054 | |
2055 if (is_at_poll_safepoint()) { | |
2056 // if the code we are returning to has deoptimized we must defer | |
2057 // the exception otherwise live registers get clobbered on the | |
2058 // exception path before deoptimization is able to retrieve them. | |
2059 // | |
2060 RegisterMap map(this, false); | |
2061 frame caller_fr = last_frame().sender(&map); | |
2062 assert(caller_fr.is_compiled_frame(), "what?"); | |
2063 if (caller_fr.is_deoptimized_frame()) { | |
2064 if (TraceExceptions) { | |
2065 ResourceMark rm; | |
2066 tty->print_cr("deferred async exception at compiled safepoint"); | |
2067 } | |
2068 return; | |
2069 } | |
2070 } | |
2071 } | |
2072 | |
2073 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
2074 if (condition == _no_async_condition) { | |
2075 // Conditions have changed since has_special_runtime_exit_condition() | |
2076 // was called: | |
2077 // - if we were here only because of an external suspend request, | |
2078 // then that was taken care of above (or cancelled) so we are done | |
2079 // - if we were here because of another async request, then it has | |
2080 // been cleared between the has_special_runtime_exit_condition() | |
2081 // and now so again we are done | |
2082 return; | |
2083 } | |
2084 | |
2085 // Check for pending async. exception | |
2086 if (_pending_async_exception != NULL) { | |
2087 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1142 | 2088 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2089 |
2090 // We cannot call Exceptions::_throw(...) here because we cannot block | |
2091 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
2092 | |
2093 if (TraceExceptions) { | |
2094 ResourceMark rm; | |
2095 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
2096 if (has_last_Java_frame() ) { | |
2097 frame f = last_frame(); | |
2098 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
2099 } | |
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diff
changeset
|
2100 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2101 } |
2102 _pending_async_exception = NULL; | |
2103 clear_has_async_exception(); | |
2104 } | |
2105 } | |
2106 | |
2107 if (check_unsafe_error && | |
2108 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
2109 condition = _no_async_condition; // done | |
2110 switch (thread_state()) { | |
2111 case _thread_in_vm: | |
2112 { | |
2113 JavaThread* THREAD = this; | |
2114 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2115 } | |
2116 case _thread_in_native: | |
2117 { | |
2118 ThreadInVMfromNative tiv(this); | |
2119 JavaThread* THREAD = this; | |
2120 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2121 } | |
2122 case _thread_in_Java: | |
2123 { | |
2124 ThreadInVMfromJava tiv(this); | |
2125 JavaThread* THREAD = this; | |
2126 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
2127 } | |
2128 default: | |
2129 ShouldNotReachHere(); | |
2130 } | |
2131 } | |
2132 | |
2133 assert(condition == _no_async_condition || has_pending_exception() || | |
2134 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
2135 "must have handled the async condition, if no exception"); | |
2136 } | |
2137 | |
2138 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
2139 // | |
2140 // Check for pending external suspend. Internal suspend requests do | |
2141 // not use handle_special_runtime_exit_condition(). | |
2142 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2143 // thread is not the current thread. In older versions of jdbx, jdbx | |
2144 // threads could call into the VM with another thread's JNIEnv so we | |
2145 // can be here operating on behalf of a suspended thread (4432884). | |
2146 bool do_self_suspend = is_external_suspend_with_lock(); | |
2147 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
2148 // | |
2149 // Because thread is external suspended the safepoint code will count | |
2150 // thread as at a safepoint. This can be odd because we can be here | |
2151 // as _thread_in_Java which would normally transition to _thread_blocked | |
2152 // at a safepoint. We would like to mark the thread as _thread_blocked | |
2153 // before calling java_suspend_self like all other callers of it but | |
2154 // we must then observe proper safepoint protocol. (We can't leave | |
2155 // _thread_blocked with a safepoint in progress). However we can be | |
2156 // here as _thread_in_native_trans so we can't use a normal transition | |
2157 // constructor/destructor pair because they assert on that type of | |
2158 // transition. We could do something like: | |
2159 // | |
2160 // JavaThreadState state = thread_state(); | |
2161 // set_thread_state(_thread_in_vm); | |
2162 // { | |
2163 // ThreadBlockInVM tbivm(this); | |
2164 // java_suspend_self() | |
2165 // } | |
2166 // set_thread_state(_thread_in_vm_trans); | |
2167 // if (safepoint) block; | |
2168 // set_thread_state(state); | |
2169 // | |
2170 // but that is pretty messy. Instead we just go with the way the | |
2171 // code has worked before and note that this is the only path to | |
2172 // java_suspend_self that doesn't put the thread in _thread_blocked | |
2173 // mode. | |
2174 | |
2175 frame_anchor()->make_walkable(this); | |
2176 java_suspend_self(); | |
2177 | |
2178 // We might be here for reasons in addition to the self-suspend request | |
2179 // so check for other async requests. | |
2180 } | |
2181 | |
2182 if (check_asyncs) { | |
2183 check_and_handle_async_exceptions(); | |
2184 } | |
2185 } | |
2186 | |
2187 void JavaThread::send_thread_stop(oop java_throwable) { | |
2188 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
2189 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
2190 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
2191 | |
2192 // Do not throw asynchronous exceptions against the compiler thread | |
2193 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
1410
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Added methods to c1x_VMExits.cpp
Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
parents:
1320
diff
changeset
|
2194 |
5056
2f2c6347fce4
comments cleanup/retagging
Gilles Duboscq <duboscq@ssw.jku.at>
parents:
4993
diff
changeset
|
2195 // (thomaswue) May we do this? |
1410
b30a2cd5e3a2
Added methods to c1x_VMExits.cpp
Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
parents:
1320
diff
changeset
|
2196 //if (is_Compiler_thread()) return; |
0 | 2197 |
2198 { | |
2199 // Actually throw the Throwable against the target Thread - however | |
2200 // only if there is no thread death exception installed already. | |
1142 | 2201 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2202 // If the topmost frame is a runtime stub, then we are calling into |
2203 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
2204 // must deoptimize the caller before continuing, as the compiled exception handler table | |
2205 // may not be valid | |
2206 if (has_last_Java_frame()) { | |
2207 frame f = last_frame(); | |
2208 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
2209 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2210 RegisterMap reg_map(this, UseBiasedLocking); | |
2211 frame compiled_frame = f.sender(®_map); | |
2212 if (compiled_frame.can_be_deoptimized()) { | |
5110
0ebca2e35ca5
more preparations for disabling runtime feedback selectively based on deoptimization history
Christian Haeubl <christian.haeubl@oracle.com>
parents:
5056
diff
changeset
|
2213 Deoptimization::deoptimize(this, compiled_frame, ®_map, Deoptimization::Reason_constraint); |
0 | 2214 } |
2215 } | |
2216 } | |
2217 | |
2218 // Set async. pending exception in thread. | |
2219 set_pending_async_exception(java_throwable); | |
2220 | |
2221 if (TraceExceptions) { | |
2222 ResourceMark rm; | |
6725
da91efe96a93
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coleenp
parents:
6198
diff
changeset
|
2223 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2224 } |
2225 // for AbortVMOnException flag | |
6725
da91efe96a93
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coleenp
parents:
6198
diff
changeset
|
2226 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
0 | 2227 } |
2228 } | |
2229 | |
2230 | |
2231 // Interrupt thread so it will wake up from a potential wait() | |
2232 Thread::interrupt(this); | |
2233 } | |
2234 | |
2235 // External suspension mechanism. | |
2236 // | |
2237 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
2238 // to any VM_locks and it is at a transition | |
2239 // Self-suspension will happen on the transition out of the vm. | |
2240 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
2241 // | |
2242 // Guarantees on return: | |
2243 // + Target thread will not execute any new bytecode (that's why we need to | |
2244 // force a safepoint) | |
2245 // + Target thread will not enter any new monitors | |
2246 // | |
2247 void JavaThread::java_suspend() { | |
2248 { MutexLocker mu(Threads_lock); | |
2249 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
2250 return; | |
2251 } | |
2252 } | |
2253 | |
2254 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2255 if (!is_external_suspend()) { | |
2256 // a racing resume has cancelled us; bail out now | |
2257 return; | |
2258 } | |
2259 | |
2260 // suspend is done | |
2261 uint32_t debug_bits = 0; | |
2262 // Warning: is_ext_suspend_completed() may temporarily drop the | |
2263 // SR_lock to allow the thread to reach a stable thread state if | |
2264 // it is currently in a transient thread state. | |
2265 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
2266 SuspendRetryDelay, &debug_bits) ) { | |
2267 return; | |
2268 } | |
2269 } | |
2270 | |
2271 VM_ForceSafepoint vm_suspend; | |
2272 VMThread::execute(&vm_suspend); | |
2273 } | |
2274 | |
2275 // Part II of external suspension. | |
2276 // A JavaThread self suspends when it detects a pending external suspend | |
2277 // request. This is usually on transitions. It is also done in places | |
2278 // where continuing to the next transition would surprise the caller, | |
2279 // e.g., monitor entry. | |
2280 // | |
2281 // Returns the number of times that the thread self-suspended. | |
2282 // | |
2283 // Note: DO NOT call java_suspend_self() when you just want to block current | |
2284 // thread. java_suspend_self() is the second stage of cooperative | |
2285 // suspension for external suspend requests and should only be used | |
2286 // to complete an external suspend request. | |
2287 // | |
2288 int JavaThread::java_suspend_self() { | |
2289 int ret = 0; | |
2290 | |
2291 // we are in the process of exiting so don't suspend | |
2292 if (is_exiting()) { | |
2293 clear_external_suspend(); | |
2294 return ret; | |
2295 } | |
2296 | |
2297 assert(_anchor.walkable() || | |
2298 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
2299 "must have walkable stack"); | |
2300 | |
2301 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2302 | |
979 | 2303 assert(!this->is_ext_suspended(), |
0 | 2304 "a thread trying to self-suspend should not already be suspended"); |
2305 | |
2306 if (this->is_suspend_equivalent()) { | |
2307 // If we are self-suspending as a result of the lifting of a | |
2308 // suspend equivalent condition, then the suspend_equivalent | |
2309 // flag is not cleared until we set the ext_suspended flag so | |
2310 // that wait_for_ext_suspend_completion() returns consistent | |
2311 // results. | |
2312 this->clear_suspend_equivalent(); | |
2313 } | |
2314 | |
2315 // A racing resume may have cancelled us before we grabbed SR_lock | |
2316 // above. Or another external suspend request could be waiting for us | |
2317 // by the time we return from SR_lock()->wait(). The thread | |
2318 // that requested the suspension may already be trying to walk our | |
2319 // stack and if we return now, we can change the stack out from under | |
2320 // it. This would be a "bad thing (TM)" and cause the stack walker | |
2321 // to crash. We stay self-suspended until there are no more pending | |
2322 // external suspend requests. | |
2323 while (is_external_suspend()) { | |
2324 ret++; | |
2325 this->set_ext_suspended(); | |
2326 | |
2327 // _ext_suspended flag is cleared by java_resume() | |
2328 while (is_ext_suspended()) { | |
2329 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
2330 } | |
2331 } | |
2332 | |
2333 return ret; | |
2334 } | |
2335 | |
2336 #ifdef ASSERT | |
2337 // verify the JavaThread has not yet been published in the Threads::list, and | |
2338 // hence doesn't need protection from concurrent access at this stage | |
2339 void JavaThread::verify_not_published() { | |
2340 if (!Threads_lock->owned_by_self()) { | |
2341 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
2342 assert( !Threads::includes(this), | |
2343 "java thread shouldn't have been published yet!"); | |
2344 } | |
2345 else { | |
2346 assert( !Threads::includes(this), | |
2347 "java thread shouldn't have been published yet!"); | |
2348 } | |
2349 } | |
2350 #endif | |
2351 | |
2352 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2353 // progress or when _suspend_flags is non-zero. | |
2354 // Current thread needs to self-suspend if there is a suspend request and/or | |
2355 // block if a safepoint is in progress. | |
2356 // Async exception ISN'T checked. | |
2357 // Note only the ThreadInVMfromNative transition can call this function | |
2358 // directly and when thread state is _thread_in_native_trans | |
2359 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
2360 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
2361 | |
2362 JavaThread *curJT = JavaThread::current(); | |
2363 bool do_self_suspend = thread->is_external_suspend(); | |
2364 | |
2365 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
2366 | |
2367 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2368 // thread is not the current thread. In older versions of jdbx, jdbx | |
2369 // threads could call into the VM with another thread's JNIEnv so we | |
2370 // can be here operating on behalf of a suspended thread (4432884). | |
2371 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2372 JavaThreadState state = thread->thread_state(); | |
2373 | |
2374 // We mark this thread_blocked state as a suspend-equivalent so | |
2375 // that a caller to is_ext_suspend_completed() won't be confused. | |
2376 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2377 thread->set_suspend_equivalent(); | |
2378 | |
2379 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2380 // wait until the thread changes to other thread state. There is no | |
2381 // guarantee on how soon we can obtain the SR_lock and complete the | |
2382 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2383 // too long. Temporarily change the state to _thread_blocked to | |
2384 // let the VM thread know that this thread is ready for GC. The problem | |
2385 // of changing thread state is that safepoint could happen just after | |
2386 // java_suspend_self() returns after being resumed, and VM thread will | |
2387 // see the _thread_blocked state. We must check for safepoint | |
2388 // after restoring the state and make sure we won't leave while a safepoint | |
2389 // is in progress. | |
2390 thread->set_thread_state(_thread_blocked); | |
2391 thread->java_suspend_self(); | |
2392 thread->set_thread_state(state); | |
2393 // Make sure new state is seen by VM thread | |
2394 if (os::is_MP()) { | |
2395 if (UseMembar) { | |
2396 // Force a fence between the write above and read below | |
2397 OrderAccess::fence(); | |
2398 } else { | |
2399 // Must use this rather than serialization page in particular on Windows | |
2400 InterfaceSupport::serialize_memory(thread); | |
2401 } | |
2402 } | |
2403 } | |
2404 | |
2405 if (SafepointSynchronize::do_call_back()) { | |
2406 // If we are safepointing, then block the caller which may not be | |
2407 // the same as the target thread (see above). | |
2408 SafepointSynchronize::block(curJT); | |
2409 } | |
2410 | |
2411 if (thread->is_deopt_suspend()) { | |
2412 thread->clear_deopt_suspend(); | |
2413 RegisterMap map(thread, false); | |
2414 frame f = thread->last_frame(); | |
2415 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2416 f = f.sender(&map); | |
2417 } | |
2418 if (f.id() == thread->must_deopt_id()) { | |
2419 thread->clear_must_deopt_id(); | |
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1689
diff
changeset
|
2420 f.deoptimize(thread); |
0 | 2421 } else { |
2422 fatal("missed deoptimization!"); | |
2423 } | |
2424 } | |
2425 } | |
2426 | |
2427 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2428 // progress or when _suspend_flags is non-zero. | |
2429 // Current thread needs to self-suspend if there is a suspend request and/or | |
2430 // block if a safepoint is in progress. | |
2431 // Also check for pending async exception (not including unsafe access error). | |
2432 // Note only the native==>VM/Java barriers can call this function and when | |
2433 // thread state is _thread_in_native_trans. | |
2434 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2435 check_safepoint_and_suspend_for_native_trans(thread); | |
2436 | |
2437 if (thread->has_async_exception()) { | |
2438 // We are in _thread_in_native_trans state, don't handle unsafe | |
2439 // access error since that may block. | |
2440 thread->check_and_handle_async_exceptions(false); | |
2441 } | |
2442 } | |
2443 | |
4873
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2444 // This is a variant of the normal |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
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parents:
4872
diff
changeset
|
2445 // check_special_condition_for_native_trans with slightly different |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2446 // semantics for use by critical native wrappers. It does all the |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2447 // normal checks but also performs the transition back into |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
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parents:
4872
diff
changeset
|
2448 // thread_in_Java state. This is required so that critical natives |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
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parents:
4872
diff
changeset
|
2449 // can potentially block and perform a GC if they are the last thread |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2450 // exiting the GC_locker. |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2451 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2452 check_special_condition_for_native_trans(thread); |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
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parents:
4872
diff
changeset
|
2453 |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
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parents:
4872
diff
changeset
|
2454 // Finish the transition |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
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parents:
4872
diff
changeset
|
2455 thread->set_thread_state(_thread_in_Java); |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
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parents:
4872
diff
changeset
|
2456 |
0382d2b469b2
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diff
changeset
|
2457 if (thread->do_critical_native_unlock()) { |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2458 ThreadInVMfromJavaNoAsyncException tiv(thread); |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2459 GC_locker::unlock_critical(thread); |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2460 thread->clear_critical_native_unlock(); |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2461 } |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2462 } |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2463 |
0 | 2464 // We need to guarantee the Threads_lock here, since resumes are not |
2465 // allowed during safepoint synchronization | |
2466 // Can only resume from an external suspension | |
2467 void JavaThread::java_resume() { | |
2468 assert_locked_or_safepoint(Threads_lock); | |
2469 | |
2470 // Sanity check: thread is gone, has started exiting or the thread | |
2471 // was not externally suspended. | |
2472 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2473 return; | |
2474 } | |
2475 | |
2476 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2477 | |
2478 clear_external_suspend(); | |
2479 | |
2480 if (is_ext_suspended()) { | |
2481 clear_ext_suspended(); | |
2482 SR_lock()->notify_all(); | |
2483 } | |
2484 } | |
2485 | |
2486 void JavaThread::create_stack_guard_pages() { | |
2487 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2488 address low_addr = stack_base() - stack_size(); | |
2489 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2490 | |
2491 int allocate = os::allocate_stack_guard_pages(); | |
2492 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2493 | |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1290
diff
changeset
|
2494 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
0 | 2495 warning("Attempt to allocate stack guard pages failed."); |
2496 return; | |
2497 } | |
2498 | |
2499 if (os::guard_memory((char *) low_addr, len)) { | |
2500 _stack_guard_state = stack_guard_enabled; | |
2501 } else { | |
2502 warning("Attempt to protect stack guard pages failed."); | |
2503 if (os::uncommit_memory((char *) low_addr, len)) { | |
2504 warning("Attempt to deallocate stack guard pages failed."); | |
2505 } | |
2506 } | |
2507 } | |
2508 | |
2509 void JavaThread::remove_stack_guard_pages() { | |
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6872
diff
changeset
|
2510 assert(Thread::current() == this, "from different thread"); |
0 | 2511 if (_stack_guard_state == stack_guard_unused) return; |
2512 address low_addr = stack_base() - stack_size(); | |
2513 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2514 | |
2515 if (os::allocate_stack_guard_pages()) { | |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1290
diff
changeset
|
2516 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
0 | 2517 _stack_guard_state = stack_guard_unused; |
2518 } else { | |
2519 warning("Attempt to deallocate stack guard pages failed."); | |
2520 } | |
2521 } else { | |
2522 if (_stack_guard_state == stack_guard_unused) return; | |
2523 if (os::unguard_memory((char *) low_addr, len)) { | |
2524 _stack_guard_state = stack_guard_unused; | |
2525 } else { | |
2526 warning("Attempt to unprotect stack guard pages failed."); | |
2527 } | |
2528 } | |
2529 } | |
2530 | |
2531 void JavaThread::enable_stack_yellow_zone() { | |
2532 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2533 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2534 | |
2535 // The base notation is from the stacks point of view, growing downward. | |
2536 // We need to adjust it to work correctly with guard_memory() | |
2537 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2538 | |
2539 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2540 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2541 | |
2542 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2543 _stack_guard_state = stack_guard_enabled; | |
2544 } else { | |
2545 warning("Attempt to guard stack yellow zone failed."); | |
2546 } | |
2547 enable_register_stack_guard(); | |
2548 } | |
2549 | |
2550 void JavaThread::disable_stack_yellow_zone() { | |
2551 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2552 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2553 | |
2554 // Simply return if called for a thread that does not use guard pages. | |
2555 if (_stack_guard_state == stack_guard_unused) return; | |
2556 | |
2557 // The base notation is from the stacks point of view, growing downward. | |
2558 // We need to adjust it to work correctly with guard_memory() | |
2559 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2560 | |
2561 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2562 _stack_guard_state = stack_guard_yellow_disabled; | |
2563 } else { | |
2564 warning("Attempt to unguard stack yellow zone failed."); | |
2565 } | |
2566 disable_register_stack_guard(); | |
2567 } | |
2568 | |
2569 void JavaThread::enable_stack_red_zone() { | |
2570 // The base notation is from the stacks point of view, growing downward. | |
2571 // We need to adjust it to work correctly with guard_memory() | |
2572 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2573 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2574 | |
2575 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2576 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2577 | |
2578 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2579 warning("Attempt to guard stack red zone failed."); | |
2580 } | |
2581 } | |
2582 | |
2583 void JavaThread::disable_stack_red_zone() { | |
2584 // The base notation is from the stacks point of view, growing downward. | |
2585 // We need to adjust it to work correctly with guard_memory() | |
2586 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2587 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2588 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2589 warning("Attempt to unguard stack red zone failed."); | |
2590 } | |
2591 } | |
2592 | |
2593 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2594 // ignore is there is no stack | |
2595 if (!has_last_Java_frame()) return; | |
2596 // traverse the stack frames. Starts from top frame. | |
2597 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2598 frame* fr = fst.current(); | |
2599 f(fr, fst.register_map()); | |
2600 } | |
2601 } | |
2602 | |
2603 | |
2604 #ifndef PRODUCT | |
2605 // Deoptimization | |
2606 // Function for testing deoptimization | |
2607 void JavaThread::deoptimize() { | |
2608 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2609 StackFrameStream fst(this, UseBiasedLocking); | |
2610 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2611 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2612 // Iterate over all frames in the thread and deoptimize | |
2613 for(; !fst.is_done(); fst.next()) { | |
2614 if(fst.current()->can_be_deoptimized()) { | |
2615 | |
2616 if (only_at) { | |
2617 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2618 // consists of comma or carriage return separated numbers so | |
2619 // search for the current bci in that string. | |
2620 address pc = fst.current()->pc(); | |
2621 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2622 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2623 char buffer[8]; | |
2624 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2625 size_t len = strlen(buffer); | |
2626 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2627 while (found != NULL) { | |
2628 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2629 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2630 // Check that the bci found is bracketed by terminators. | |
2631 break; | |
2632 } | |
2633 found = strstr(found + 1, buffer); | |
2634 } | |
2635 if (!found) { | |
2636 continue; | |
2637 } | |
2638 } | |
2639 | |
2640 if (DebugDeoptimization && !deopt) { | |
2641 deopt = true; // One-time only print before deopt | |
2642 tty->print_cr("[BEFORE Deoptimization]"); | |
2643 trace_frames(); | |
2644 trace_stack(); | |
2645 } | |
5111
422c979ff392
fixed two cases where DeoptAction was invalid
Christian Haeubl <christian.haeubl@oracle.com>
parents:
5110
diff
changeset
|
2646 Deoptimization::deoptimize(this, *fst.current(), fst.register_map(), Deoptimization::Reason_constraint); |
0 | 2647 } |
2648 } | |
2649 | |
2650 if (DebugDeoptimization && deopt) { | |
2651 tty->print_cr("[AFTER Deoptimization]"); | |
2652 trace_frames(); | |
2653 } | |
2654 } | |
2655 | |
2656 | |
2657 // Make zombies | |
2658 void JavaThread::make_zombies() { | |
2659 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2660 if (fst.current()->can_be_deoptimized()) { | |
2661 // it is a Java nmethod | |
2662 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2663 nm->make_not_entrant(); | |
2664 } | |
2665 } | |
2666 } | |
2667 #endif // PRODUCT | |
2668 | |
2669 | |
2670 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2671 if (!has_last_Java_frame()) return; | |
2672 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2673 StackFrameStream fst(this, UseBiasedLocking); | |
2674 for(; !fst.is_done(); fst.next()) { | |
2675 if (fst.current()->should_be_deoptimized()) { | |
6843 | 2676 if (LogCompilation && xtty != NULL) { |
2677 nmethod* nm = fst.current()->cb()->as_nmethod_or_null(); | |
2678 xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'", | |
2679 this->name(), nm != NULL ? nm->compile_id() : -1); | |
2680 } | |
2681 | |
5110
0ebca2e35ca5
more preparations for disabling runtime feedback selectively based on deoptimization history
Christian Haeubl <christian.haeubl@oracle.com>
parents:
5056
diff
changeset
|
2682 Deoptimization::deoptimize(this, *fst.current(), fst.register_map(), Deoptimization::Reason_constraint); |
0 | 2683 } |
2684 } | |
2685 } | |
2686 | |
2687 | |
2688 // GC support | |
2689 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2690 | |
2691 void JavaThread::gc_epilogue() { | |
2692 frames_do(frame_gc_epilogue); | |
2693 } | |
2694 | |
2695 | |
2696 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2697 | |
2698 void JavaThread::gc_prologue() { | |
2699 frames_do(frame_gc_prologue); | |
2700 } | |
2701 | |
1119
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2702 // If the caller is a NamedThread, then remember, in the current scope, |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2703 // the given JavaThread in its _processed_thread field. |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2704 class RememberProcessedThread: public StackObj { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2705 NamedThread* _cur_thr; |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2706 public: |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2707 RememberProcessedThread(JavaThread* jthr) { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2708 Thread* thread = Thread::current(); |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2709 if (thread->is_Named_thread()) { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2710 _cur_thr = (NamedThread *)thread; |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2711 _cur_thr->set_processed_thread(jthr); |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2712 } else { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2713 _cur_thr = NULL; |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2714 } |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2715 } |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2716 |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2717 ~RememberProcessedThread() { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2718 if (_cur_thr) { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2719 _cur_thr->set_processed_thread(NULL); |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2720 } |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2721 } |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2722 }; |
0 | 2723 |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2724 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
1166 | 2725 // Verify that the deferred card marks have been flushed. |
2726 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
997
diff
changeset
|
2727 |
0 | 2728 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
2729 // since there may be more than one thread using each ThreadProfiler. | |
2730 | |
2731 // Traverse the GCHandles | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2732 Thread::oops_do(f, cf); |
0 | 2733 |
2734 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2735 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2736 | |
2737 if (has_last_Java_frame()) { | |
1119
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2738 // Record JavaThread to GC thread |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2739 RememberProcessedThread rpt(this); |
0 | 2740 |
2741 // Traverse the privileged stack | |
2742 if (_privileged_stack_top != NULL) { | |
2743 _privileged_stack_top->oops_do(f); | |
2744 } | |
2745 | |
2746 // traverse the registered growable array | |
2747 if (_array_for_gc != NULL) { | |
2748 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2749 f->do_oop(_array_for_gc->adr_at(index)); | |
2750 } | |
2751 } | |
2752 | |
2753 // Traverse the monitor chunks | |
2754 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2755 chunk->oops_do(f); | |
2756 } | |
2757 | |
2758 // Traverse the execution stack | |
2759 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2760 fst.current()->oops_do(f, cf, fst.register_map()); |
0 | 2761 } |
2762 } | |
2763 | |
2764 // callee_target is never live across a gc point so NULL it here should | |
2765 // it still contain a methdOop. | |
2766 | |
2767 set_callee_target(NULL); | |
2768 | |
2769 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2770 // If we have deferred set_locals there might be oops waiting to be | |
2771 // written | |
2772 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2773 if (list != NULL) { | |
2774 for (int i = 0; i < list->length(); i++) { | |
2775 list->at(i)->oops_do(f); | |
2776 } | |
2777 } | |
2778 | |
2779 // Traverse instance variables at the end since the GC may be moving things | |
2780 // around using this function | |
2781 f->do_oop((oop*) &_threadObj); | |
2782 f->do_oop((oop*) &_vm_result); | |
5747
120820e30baa
added basic high-level interpreter support to HotSpot
Christian Haeubl <haeubl@ssw.jku.at>
parents:
5111
diff
changeset
|
2783 #ifdef GRAAL |
3558
bc95d122df79
added runtime call to supply info upon deoptimization
Lukas Stadler <lukas.stadler@jku.at>
parents:
3555
diff
changeset
|
2784 f->do_oop((oop*) &_graal_deopt_info); |
5747
120820e30baa
added basic high-level interpreter support to HotSpot
Christian Haeubl <haeubl@ssw.jku.at>
parents:
5111
diff
changeset
|
2785 #endif |
0 | 2786 f->do_oop((oop*) &_exception_oop); |
2787 f->do_oop((oop*) &_pending_async_exception); | |
2788 | |
2789 if (jvmti_thread_state() != NULL) { | |
2790 jvmti_thread_state()->oops_do(f); | |
2791 } | |
3696
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2792 |
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2793 if (_scanned_nmethod != NULL && cf != NULL) { |
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2794 // Safepoints can occur when the sweeper is scanning an nmethod so |
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2795 // process it here to make sure it isn't unloaded in the middle of |
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2796 // a scan. |
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2797 cf->do_code_blob(_scanned_nmethod); |
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2798 } |
0 | 2799 } |
2800 | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2801 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2802 Thread::nmethods_do(cf); // (super method is a no-op) |
0 | 2803 |
2804 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2805 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2806 | |
2807 if (has_last_Java_frame()) { | |
2808 // Traverse the execution stack | |
2809 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2810 fst.current()->nmethods_do(cf); |
0 | 2811 } |
2812 } | |
2813 } | |
2814 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2815 void JavaThread::metadata_do(void f(Metadata*)) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2816 Thread::metadata_do(f); |
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2817 if (has_last_Java_frame()) { |
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2818 // Traverse the execution stack to call f() on the methods in the stack |
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2819 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
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2820 fst.current()->metadata_do(f); |
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2821 } |
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2822 } else if (is_Compiler_thread()) { |
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2823 // need to walk ciMetadata in current compile tasks to keep alive. |
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2824 CompilerThread* ct = (CompilerThread*)this; |
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2825 if (ct->env() != NULL) { |
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2826 ct->env()->metadata_do(f); |
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2827 } |
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2828 } |
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2829 } |
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2830 |
0 | 2831 // Printing |
2832 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2833 switch (_thread_state) { | |
2834 case _thread_uninitialized: return "_thread_uninitialized"; | |
2835 case _thread_new: return "_thread_new"; | |
2836 case _thread_new_trans: return "_thread_new_trans"; | |
2837 case _thread_in_native: return "_thread_in_native"; | |
2838 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2839 case _thread_in_vm: return "_thread_in_vm"; | |
2840 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2841 case _thread_in_Java: return "_thread_in_Java"; | |
2842 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2843 case _thread_blocked: return "_thread_blocked"; | |
2844 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2845 default: return "unknown thread state"; | |
2846 } | |
2847 } | |
2848 | |
2849 #ifndef PRODUCT | |
2850 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2851 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2852 }; | |
2853 void JavaThread::print_thread_state() const { | |
2854 print_thread_state_on(tty); | |
2855 }; | |
2856 #endif // PRODUCT | |
2857 | |
2858 // Called by Threads::print() for VM_PrintThreads operation | |
2859 void JavaThread::print_on(outputStream *st) const { | |
2860 st->print("\"%s\" ", get_thread_name()); | |
2861 oop thread_oop = threadObj(); | |
6766 | 2862 if (thread_oop != NULL) { |
2863 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); | |
2864 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2865 st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); | |
2866 } | |
0 | 2867 Thread::print_on(st); |
2868 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
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2869 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
0 | 2870 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
2871 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2872 } | |
2873 #ifndef PRODUCT | |
2874 print_thread_state_on(st); | |
2875 _safepoint_state->print_on(st); | |
2876 #endif // PRODUCT | |
2877 } | |
2878 | |
2879 // Called by fatal error handler. The difference between this and | |
2880 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2881 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2882 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2883 oop thread_obj = threadObj(); | |
2884 if (thread_obj != NULL) { | |
2885 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2886 } | |
2887 st->print(" ["); | |
2888 st->print("%s", _get_thread_state_name(_thread_state)); | |
2889 if (osthread()) { | |
2890 st->print(", id=%d", osthread()->thread_id()); | |
2891 } | |
2892 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2893 _stack_base - _stack_size, _stack_base); | |
2894 st->print("]"); | |
2895 return; | |
2896 } | |
2897 | |
2898 // Verification | |
2899 | |
2900 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2901 | |
2902 void JavaThread::verify() { | |
2903 // Verify oops in the thread. | |
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2904 oops_do(&VerifyOopClosure::verify_oop, NULL); |
0 | 2905 |
2906 // Verify the stack frames. | |
2907 frames_do(frame_verify); | |
2908 } | |
2909 | |
2910 // CR 6300358 (sub-CR 2137150) | |
2911 // Most callers of this method assume that it can't return NULL but a | |
2912 // thread may not have a name whilst it is in the process of attaching to | |
2913 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2914 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2915 // if vm exit occurs during initialization). These cases can all be accounted | |
2916 // for such that this method never returns NULL. | |
2917 const char* JavaThread::get_thread_name() const { | |
2918 #ifdef ASSERT | |
2919 // early safepoints can hit while current thread does not yet have TLS | |
2920 if (!SafepointSynchronize::is_at_safepoint()) { | |
2921 Thread *cur = Thread::current(); | |
2922 if (!(cur->is_Java_thread() && cur == this)) { | |
2923 // Current JavaThreads are allowed to get their own name without | |
2924 // the Threads_lock. | |
2925 assert_locked_or_safepoint(Threads_lock); | |
2926 } | |
2927 } | |
2928 #endif // ASSERT | |
2929 return get_thread_name_string(); | |
2930 } | |
2931 | |
2932 // Returns a non-NULL representation of this thread's name, or a suitable | |
2933 // descriptive string if there is no set name | |
2934 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2935 const char* name_str; | |
2936 oop thread_obj = threadObj(); | |
2937 if (thread_obj != NULL) { | |
2938 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2939 if (name != NULL) { | |
2940 if (buf == NULL) { | |
2941 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2942 } | |
2943 else { | |
2944 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2945 } | |
2946 } | |
4006 | 2947 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
0 | 2948 name_str = "<no-name - thread is attaching>"; |
2949 } | |
2950 else { | |
2951 name_str = Thread::name(); | |
2952 } | |
2953 } | |
2954 else { | |
2955 name_str = Thread::name(); | |
2956 } | |
2957 assert(name_str != NULL, "unexpected NULL thread name"); | |
2958 return name_str; | |
2959 } | |
2960 | |
2961 | |
2962 const char* JavaThread::get_threadgroup_name() const { | |
2963 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2964 oop thread_obj = threadObj(); | |
2965 if (thread_obj != NULL) { | |
2966 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2967 if (thread_group != NULL) { | |
2968 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
2969 // ThreadGroup.name can be null | |
2970 if (name != NULL) { | |
2971 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2972 return str; | |
2973 } | |
2974 } | |
2975 } | |
2976 return NULL; | |
2977 } | |
2978 | |
2979 const char* JavaThread::get_parent_name() const { | |
2980 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2981 oop thread_obj = threadObj(); | |
2982 if (thread_obj != NULL) { | |
2983 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2984 if (thread_group != NULL) { | |
2985 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
2986 if (parent != NULL) { | |
2987 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
2988 // ThreadGroup.name can be null | |
2989 if (name != NULL) { | |
2990 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2991 return str; | |
2992 } | |
2993 } | |
2994 } | |
2995 } | |
2996 return NULL; | |
2997 } | |
2998 | |
2999 ThreadPriority JavaThread::java_priority() const { | |
3000 oop thr_oop = threadObj(); | |
3001 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
3002 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
3003 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
3004 return priority; | |
3005 } | |
3006 | |
3007 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
3008 | |
3009 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
3010 // Link Java Thread object <-> C++ Thread | |
3011 | |
3012 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
3013 // and put it into a new Handle. The Handle "thread_oop" can then | |
3014 // be used to pass the C++ thread object to other methods. | |
3015 | |
3016 // Set the Java level thread object (jthread) field of the | |
3017 // new thread (a JavaThread *) to C++ thread object using the | |
3018 // "thread_oop" handle. | |
3019 | |
3020 // Set the thread field (a JavaThread *) of the | |
3021 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
3022 | |
3023 Handle thread_oop(Thread::current(), | |
3024 JNIHandles::resolve_non_null(jni_thread)); | |
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3025 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
0 | 3026 "must be initialized"); |
3027 set_threadObj(thread_oop()); | |
3028 java_lang_Thread::set_thread(thread_oop(), this); | |
3029 | |
3030 if (prio == NoPriority) { | |
3031 prio = java_lang_Thread::priority(thread_oop()); | |
3032 assert(prio != NoPriority, "A valid priority should be present"); | |
3033 } | |
3034 | |
3035 // Push the Java priority down to the native thread; needs Threads_lock | |
3036 Thread::set_priority(this, prio); | |
3037 | |
3038 // Add the new thread to the Threads list and set it in motion. | |
3039 // We must have threads lock in order to call Threads::add. | |
3040 // It is crucial that we do not block before the thread is | |
3041 // added to the Threads list for if a GC happens, then the java_thread oop | |
3042 // will not be visited by GC. | |
3043 Threads::add(this); | |
3044 } | |
3045 | |
3046 oop JavaThread::current_park_blocker() { | |
3047 // Support for JSR-166 locks | |
3048 oop thread_oop = threadObj(); | |
242 | 3049 if (thread_oop != NULL && |
3050 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 3051 return java_lang_Thread::park_blocker(thread_oop); |
3052 } | |
3053 return NULL; | |
3054 } | |
3055 | |
3056 | |
3057 void JavaThread::print_stack_on(outputStream* st) { | |
3058 if (!has_last_Java_frame()) return; | |
3059 ResourceMark rm; | |
3060 HandleMark hm; | |
3061 | |
3062 RegisterMap reg_map(this); | |
3063 vframe* start_vf = last_java_vframe(®_map); | |
3064 int count = 0; | |
3065 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3066 if (f->is_java_frame()) { | |
3067 javaVFrame* jvf = javaVFrame::cast(f); | |
3068 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
3069 | |
3070 // Print out lock information | |
3071 if (JavaMonitorsInStackTrace) { | |
3072 jvf->print_lock_info_on(st, count); | |
3073 } | |
3074 } else { | |
3075 // Ignore non-Java frames | |
3076 } | |
3077 | |
3078 // Bail-out case for too deep stacks | |
3079 count++; | |
3080 if (MaxJavaStackTraceDepth == count) return; | |
3081 } | |
3082 } | |
3083 | |
3084 | |
3085 // JVMTI PopFrame support | |
3086 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
3087 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
3088 if (in_bytes(size_in_bytes) != 0) { | |
6197 | 3089 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
0 | 3090 _popframe_preserved_args_size = in_bytes(size_in_bytes); |
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3091 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
0 | 3092 } |
3093 } | |
3094 | |
3095 void* JavaThread::popframe_preserved_args() { | |
3096 return _popframe_preserved_args; | |
3097 } | |
3098 | |
3099 ByteSize JavaThread::popframe_preserved_args_size() { | |
3100 return in_ByteSize(_popframe_preserved_args_size); | |
3101 } | |
3102 | |
3103 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
3104 int sz = in_bytes(popframe_preserved_args_size()); | |
3105 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
3106 return in_WordSize(sz / wordSize); | |
3107 } | |
3108 | |
3109 void JavaThread::popframe_free_preserved_args() { | |
3110 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
6197 | 3111 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
0 | 3112 _popframe_preserved_args = NULL; |
3113 _popframe_preserved_args_size = 0; | |
3114 } | |
3115 | |
3116 #ifndef PRODUCT | |
3117 | |
3118 void JavaThread::trace_frames() { | |
3119 tty->print_cr("[Describe stack]"); | |
3120 int frame_no = 1; | |
3121 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
3122 tty->print(" %d. ", frame_no++); | |
3123 fst.current()->print_value_on(tty,this); | |
3124 tty->cr(); | |
3125 } | |
3126 } | |
3127 | |
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3128 class PrintAndVerifyOopClosure: public OopClosure { |
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3129 protected: |
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3130 template <class T> inline void do_oop_work(T* p) { |
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3131 oop obj = oopDesc::load_decode_heap_oop(p); |
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3132 if (obj == NULL) return; |
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3133 tty->print(INTPTR_FORMAT ": ", p); |
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3134 if (obj->is_oop_or_null()) { |
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3135 if (obj->is_objArray()) { |
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3136 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
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3137 } else { |
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3138 obj->print(); |
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3139 } |
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3140 } else { |
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3141 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
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3142 } |
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3143 tty->cr(); |
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3144 } |
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3145 public: |
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3146 virtual void do_oop(oop* p) { do_oop_work(p); } |
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3147 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3148 }; |
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3149 |
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3150 |
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3151 static void oops_print(frame* f, const RegisterMap *map) { |
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3152 PrintAndVerifyOopClosure print; |
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3153 f->print_value(); |
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3154 f->oops_do(&print, NULL, (RegisterMap*)map); |
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3155 } |
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3156 |
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3157 // Print our all the locations that contain oops and whether they are |
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3158 // valid or not. This useful when trying to find the oldest frame |
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3159 // where an oop has gone bad since the frame walk is from youngest to |
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|
3160 // oldest. |
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diff
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|
3161 void JavaThread::trace_oops() { |
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diff
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|
3162 tty->print_cr("[Trace oops]"); |
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|
3163 frames_do(oops_print); |
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diff
changeset
|
3164 } |
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|
3165 |
0 | 3166 |
3388
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|
3167 #ifdef ASSERT |
3336
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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|
3168 // Print or validate the layout of stack frames |
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|
3169 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
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|
3170 ResourceMark rm; |
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|
3171 PRESERVE_EXCEPTION_MARK; |
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|
3172 FrameValues values; |
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|
3173 int frame_no = 0; |
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|
3174 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
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|
3175 fst.current()->describe(values, ++frame_no); |
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|
3176 if (depth == frame_no) break; |
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|
3177 } |
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diff
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|
3178 if (validate_only) { |
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|
3179 values.validate(); |
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|
3180 } else { |
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|
3181 tty->print_cr("[Describe stack layout]"); |
4042
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3182 values.print(this); |
3336
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|
3183 } |
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|
3184 } |
3388
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diff
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|
3185 #endif |
3336
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|
3186 |
0 | 3187 void JavaThread::trace_stack_from(vframe* start_vf) { |
3188 ResourceMark rm; | |
3189 int vframe_no = 1; | |
3190 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3191 if (f->is_java_frame()) { | |
3192 javaVFrame::cast(f)->print_activation(vframe_no++); | |
3193 } else { | |
3194 f->print(); | |
3195 } | |
3196 if (vframe_no > StackPrintLimit) { | |
3197 tty->print_cr("...<more frames>..."); | |
3198 return; | |
3199 } | |
3200 } | |
3201 } | |
3202 | |
3203 | |
3204 void JavaThread::trace_stack() { | |
3205 if (!has_last_Java_frame()) return; | |
3206 ResourceMark rm; | |
3207 HandleMark hm; | |
3208 RegisterMap reg_map(this); | |
3209 trace_stack_from(last_java_vframe(®_map)); | |
3210 } | |
3211 | |
3212 | |
3213 #endif // PRODUCT | |
3214 | |
3215 | |
3216 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
3217 assert(reg_map != NULL, "a map must be given"); | |
3218 frame f = last_frame(); | |
3219 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
3220 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
3221 } | |
3222 return NULL; | |
3223 } | |
3224 | |
3225 | |
6725
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6964458: Reimplement class meta-data storage to use native memory
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|
3226 Klass* JavaThread::security_get_caller_class(int depth) { |
0 | 3227 vframeStream vfst(this); |
3228 vfst.security_get_caller_frame(depth); | |
3229 if (!vfst.at_end()) { | |
3230 return vfst.method()->method_holder(); | |
3231 } | |
3232 return NULL; | |
3233 } | |
3234 | |
3235 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
3236 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
3237 CompileBroker::compiler_thread_loop(); | |
3238 } | |
3239 | |
3240 // Create a CompilerThread | |
3241 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
3242 : JavaThread(&compiler_thread_entry) { | |
3243 _log = NULL; | |
3244 _task = NULL; | |
3245 _queue = queue; | |
3246 _counters = counters; | |
3247 | |
3248 #ifndef PRODUCT | |
3249 _ideal_graph_printer = NULL; | |
3250 #endif | |
3251 } | |
3252 | |
3253 // ======= Threads ======== | |
3254 | |
3255 // The Threads class links together all active threads, and provides | |
3256 // operations over all threads. It is protected by its own Mutex | |
3257 // lock, which is also used in other contexts to protect thread | |
3258 // operations from having the thread being operated on from exiting | |
3259 // and going away unexpectedly (e.g., safepoint synchronization) | |
3260 | |
3261 JavaThread* Threads::_thread_list = NULL; | |
3262 int Threads::_number_of_threads = 0; | |
3263 int Threads::_number_of_non_daemon_threads = 0; | |
3264 int Threads::_return_code = 0; | |
3265 size_t JavaThread::_stack_size_at_create = 0; | |
6725
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|
3266 #ifdef ASSERT |
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|
3267 bool Threads::_vm_complete = false; |
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|
3268 #endif |
0 | 3269 |
3270 // All JavaThreads | |
3271 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
3272 | |
3273 void os_stream(); | |
3274 | |
3275 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
3276 void Threads::threads_do(ThreadClosure* tc) { | |
3277 assert_locked_or_safepoint(Threads_lock); | |
3278 // ALL_JAVA_THREADS iterates through all JavaThreads | |
3279 ALL_JAVA_THREADS(p) { | |
3280 tc->do_thread(p); | |
3281 } | |
3282 // Someday we could have a table or list of all non-JavaThreads. | |
3283 // For now, just manually iterate through them. | |
3284 tc->do_thread(VMThread::vm_thread()); | |
3285 Universe::heap()->gc_threads_do(tc); | |
323
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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|
3286 WatcherThread *wt = WatcherThread::watcher_thread(); |
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|
3287 // Strictly speaking, the following NULL check isn't sufficient to make sure |
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|
3288 // the data for WatcherThread is still valid upon being examined. However, |
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|
3289 // considering that WatchThread terminates when the VM is on the way to |
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|
3290 // exit at safepoint, the chance of the above is extremely small. The right |
b33eef719520
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xlu
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|
3291 // way to prevent termination of WatcherThread would be to acquire |
b33eef719520
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xlu
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|
3292 // Terminator_lock, but we can't do that without violating the lock rank |
b33eef719520
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|
3293 // checking in some cases. |
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|
3294 if (wt != NULL) |
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|
3295 tc->do_thread(wt); |
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|
3296 |
0 | 3297 // If CompilerThreads ever become non-JavaThreads, add them here |
3298 } | |
3299 | |
3300 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
3301 | |
242 | 3302 extern void JDK_Version_init(); |
3303 | |
0 | 3304 // Check version |
3305 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
3306 | |
3307 // Initialize the output stream module | |
3308 ostream_init(); | |
3309 | |
3310 // Process java launcher properties. | |
3311 Arguments::process_sun_java_launcher_properties(args); | |
3312 | |
3313 // Initialize the os module before using TLS | |
3314 os::init(); | |
3315 | |
3316 // Initialize system properties. | |
3317 Arguments::init_system_properties(); | |
3318 | |
242 | 3319 // So that JDK version can be used as a discrimintor when parsing arguments |
3320 JDK_Version_init(); | |
3321 | |
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3322 // Update/Initialize System properties after JDK version number is known |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3323 Arguments::init_version_specific_system_properties(); |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
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1731
diff
changeset
|
3324 |
0 | 3325 // Parse arguments |
3326 jint parse_result = Arguments::parse(args); | |
3327 if (parse_result != JNI_OK) return parse_result; | |
3328 | |
3329 if (PauseAtStartup) { | |
3330 os::pause(); | |
3331 } | |
3332 | |
4006 | 3333 #ifndef USDT2 |
0 | 3334 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
4006 | 3335 #else /* USDT2 */ |
3336 HOTSPOT_VM_INIT_BEGIN(); | |
3337 #endif /* USDT2 */ | |
0 | 3338 |
3339 // Record VM creation timing statistics | |
3340 TraceVmCreationTime create_vm_timer; | |
3341 create_vm_timer.start(); | |
3342 | |
3343 // Timing (must come after argument parsing) | |
3344 TraceTime timer("Create VM", TraceStartupTime); | |
3345 | |
3346 // Initialize the os module after parsing the args | |
3347 jint os_init_2_result = os::init_2(); | |
3348 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
3349 | |
6197 | 3350 // intialize TLS |
3351 ThreadLocalStorage::init(); | |
3352 | |
3353 // Bootstrap native memory tracking, so it can start recording memory | |
3354 // activities before worker thread is started. This is the first phase | |
3355 // of bootstrapping, VM is currently running in single-thread mode. | |
3356 MemTracker::bootstrap_single_thread(); | |
3357 | |
0 | 3358 // Initialize output stream logging |
3359 ostream_init_log(); | |
3360 | |
3361 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
3362 // Must be before create_vm_init_agents() | |
3363 if (Arguments::init_libraries_at_startup()) { | |
3364 convert_vm_init_libraries_to_agents(); | |
3365 } | |
3366 | |
3367 // Launch -agentlib/-agentpath and converted -Xrun agents | |
3368 if (Arguments::init_agents_at_startup()) { | |
3369 create_vm_init_agents(); | |
3370 } | |
3371 | |
3372 // Initialize Threads state | |
3373 _thread_list = NULL; | |
3374 _number_of_threads = 0; | |
3375 _number_of_non_daemon_threads = 0; | |
3376 | |
3377 // Initialize global data structures and create system classes in heap | |
3378 vm_init_globals(); | |
3379 | |
3380 // Attach the main thread to this os thread | |
3381 JavaThread* main_thread = new JavaThread(); | |
3382 main_thread->set_thread_state(_thread_in_vm); | |
3383 // must do this before set_active_handles and initialize_thread_local_storage | |
3384 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
3385 // change the stack size recorded here to one based on the java thread | |
3386 // stacksize. This adjusted size is what is used to figure the placement | |
3387 // of the guard pages. | |
3388 main_thread->record_stack_base_and_size(); | |
3389 main_thread->initialize_thread_local_storage(); | |
3390 | |
3391 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
3392 | |
3393 if (!main_thread->set_as_starting_thread()) { | |
3394 vm_shutdown_during_initialization( | |
3395 "Failed necessary internal allocation. Out of swap space"); | |
3396 delete main_thread; | |
3397 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3398 return JNI_ENOMEM; | |
3399 } | |
3400 | |
3401 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
3402 // crash Linux VM, see notes in os_linux.cpp. | |
3403 main_thread->create_stack_guard_pages(); | |
3404 | |
1878 | 3405 // Initialize Java-Level synchronization subsystem |
3406 ObjectMonitor::Initialize() ; | |
0 | 3407 |
6197 | 3408 // Second phase of bootstrapping, VM is about entering multi-thread mode |
3409 MemTracker::bootstrap_multi_thread(); | |
3410 | |
0 | 3411 // Initialize global modules |
3412 jint status = init_globals(); | |
3413 if (status != JNI_OK) { | |
3414 delete main_thread; | |
3415 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3416 return status; | |
3417 } | |
3418 | |
1681
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diff
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|
3419 // Should be done after the heap is fully created |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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diff
changeset
|
3420 main_thread->cache_global_variables(); |
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|
3421 |
0 | 3422 HandleMark hm; |
3423 | |
3424 { MutexLocker mu(Threads_lock); | |
3425 Threads::add(main_thread); | |
3426 } | |
3427 | |
3428 // Any JVMTI raw monitors entered in onload will transition into | |
3429 // real raw monitor. VM is setup enough here for raw monitor enter. | |
3430 JvmtiExport::transition_pending_onload_raw_monitors(); | |
3431 | |
3432 if (VerifyBeforeGC && | |
3433 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
3434 Universe::heap()->prepare_for_verify(); | |
3435 Universe::verify(); // make sure we're starting with a clean slate | |
3436 } | |
3437 | |
6197 | 3438 // Fully start NMT |
3439 MemTracker::start(); | |
3440 | |
0 | 3441 // Create the VMThread |
3442 { TraceTime timer("Start VMThread", TraceStartupTime); | |
3443 VMThread::create(); | |
3444 Thread* vmthread = VMThread::vm_thread(); | |
3445 | |
3446 if (!os::create_thread(vmthread, os::vm_thread)) | |
3447 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
3448 | |
3449 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
3450 // Monitors can have spurious returns, must always check another state flag | |
3451 { | |
3452 MutexLocker ml(Notify_lock); | |
3453 os::start_thread(vmthread); | |
3454 while (vmthread->active_handles() == NULL) { | |
3455 Notify_lock->wait(); | |
3456 } | |
3457 } | |
3458 } | |
3459 | |
3460 assert (Universe::is_fully_initialized(), "not initialized"); | |
3461 EXCEPTION_MARK; | |
3462 | |
3463 // At this point, the Universe is initialized, but we have not executed | |
3464 // any byte code. Now is a good time (the only time) to dump out the | |
3465 // internal state of the JVM for sharing. | |
3466 if (DumpSharedSpaces) { | |
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|
3467 MetaspaceShared::preload_and_dump(CHECK_0); |
0 | 3468 ShouldNotReachHere(); |
3469 } | |
3470 | |
3471 // Always call even when there are not JVMTI environments yet, since environments | |
3472 // may be attached late and JVMTI must track phases of VM execution | |
3473 JvmtiExport::enter_start_phase(); | |
3474 | |
3475 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
3476 JvmtiExport::post_vm_start(); | |
3477 | |
3478 { | |
3479 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
3480 | |
3481 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3482 create_vm_init_libraries(); | |
3483 } | |
3484 | |
3485 if (InitializeJavaLangString) { | |
2177
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6990754: Use native memory and reference counting to implement SymbolTable
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2162
diff
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|
3486 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
0 | 3487 } else { |
3488 warning("java.lang.String not initialized"); | |
3489 } | |
3490 | |
18
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|
3491 if (AggressiveOpts) { |
192
6d13fcb3663f
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|
3492 { |
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|
3493 // Forcibly initialize java/util/HashMap and mutate the private |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
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diff
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|
3494 // static final "frontCacheEnabled" field before we start creating instances |
18
c7d713375c94
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diff
changeset
|
3495 #ifdef ASSERT |
6725
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|
3496 Klass* tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
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|
3497 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
18
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|
3498 #endif |
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|
3499 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
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3500 KlassHandle k = KlassHandle(THREAD, k_o); |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
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diff
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|
3501 guarantee(k.not_null(), "Must find java/util/HashMap"); |
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|
3502 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
6d13fcb3663f
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kvn
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62
diff
changeset
|
3503 ik->initialize(CHECK_0); |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3504 fieldDescriptor fd; |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3505 // Possible we might not find this field; if so, don't break |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3506 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
|
3507 k()->java_mirror()->bool_field_put(fd.offset(), true); |
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3508 } |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3509 } |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3510 |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3511 if (UseStringCache) { |
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3512 // Forcibly initialize java/lang/StringValue and mutate the private |
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3513 // static final "stringCacheEnabled" field before we start creating instances |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3514 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
|
3515 // 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
|
3516 if (k_o != NULL) { |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3517 KlassHandle k = KlassHandle(THREAD, k_o); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3518 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3519 ik->initialize(CHECK_0); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3520 fieldDescriptor fd; |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3521 // 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
|
3522 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
|
3523 k()->java_mirror()->bool_field_put(fd.offset(), true); |
669
eca19a8425b5
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parents:
441
diff
changeset
|
3524 } |
192
6d13fcb3663f
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kvn
parents:
62
diff
changeset
|
3525 } |
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3526 } |
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3527 } |
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3528 |
0 | 3529 // Initialize java_lang.System (needed before creating the thread) |
3530 if (InitializeJavaLangSystem) { | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3531 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3532 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
0 | 3533 Handle thread_group = create_initial_thread_group(CHECK_0); |
3534 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
|
3535 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
0 | 3536 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
3537 main_thread->set_threadObj(thread_object); | |
3538 // Set thread status to running since main thread has | |
3539 // been started and running. | |
3540 java_lang_Thread::set_thread_status(thread_object, | |
3541 java_lang_Thread::RUNNABLE); | |
3542 | |
3543 // 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
|
3544 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
|
3545 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
0 | 3546 // 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
|
3547 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
0 | 3548 call_initializeSystemClass(CHECK_0); |
6181 | 3549 |
3550 // get the Java runtime name after java.lang.System is initialized | |
3551 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); | |
6921
a1b8cf9cf970
8002078: hs_err_pid file should report full JDK version string
sla
parents:
6882
diff
changeset
|
3552 JDK_Version::set_runtime_version(get_java_runtime_version(THREAD)); |
0 | 3553 } else { |
3554 warning("java.lang.System not initialized"); | |
3555 } | |
3556 | |
3557 // an instance of OutOfMemory exception has been allocated earlier | |
3558 if (InitializeJavaLangExceptionsErrors) { | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3559 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3560 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3561 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3562 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3563 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3564 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3565 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3566 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); |
0 | 3567 } else { |
3568 warning("java.lang.OutOfMemoryError has not been initialized"); | |
3569 warning("java.lang.NullPointerException has not been initialized"); | |
3570 warning("java.lang.ClassCastException has not been initialized"); | |
3571 warning("java.lang.ArrayStoreException has not been initialized"); | |
3572 warning("java.lang.ArithmeticException has not been initialized"); | |
3573 warning("java.lang.StackOverflowError has not been initialized"); | |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3574 warning("java.lang.IllegalArgumentException has not been initialized"); |
0 | 3575 } |
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2376
diff
changeset
|
3576 } |
0 | 3577 |
3578 // See : bugid 4211085. | |
3579 // Background : the static initializer of java.lang.Compiler tries to read | |
3580 // property"java.compiler" and read & write property "java.vm.info". | |
3581 // When a security manager is installed through the command line | |
3582 // option "-Djava.security.manager", the above properties are not | |
3583 // readable and the static initializer for java.lang.Compiler fails | |
3584 // resulting in a NoClassDefFoundError. This can happen in any | |
3585 // user code which calls methods in java.lang.Compiler. | |
3586 // Hack : the hack is to pre-load and initialize this class, so that only | |
3587 // system domains are on the stack when the properties are read. | |
3588 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
3589 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
3590 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
3591 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
3592 // 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
|
3593 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
0 | 3594 |
3595 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
3596 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
3597 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
3598 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
3599 // This should also be taken out as soon as 4211383 gets fixed. | |
3600 reset_vm_info_property(CHECK_0); | |
3601 | |
3602 quicken_jni_functions(); | |
3603 | |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3604 // Must be run after init_ft which initializes ft_enabled |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3605 if (TRACE_INITIALIZE() != JNI_OK) { |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3606 vm_exit_during_initialization("Failed to initialize tracing backend"); |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3607 } |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3608 |
0 | 3609 // Set flag that basic initialization has completed. Used by exceptions and various |
3610 // debug stuff, that does not work until all basic classes have been initialized. | |
3611 set_init_completed(); | |
3612 | |
4006 | 3613 #ifndef USDT2 |
0 | 3614 HS_DTRACE_PROBE(hotspot, vm__init__end); |
4006 | 3615 #else /* USDT2 */ |
3616 HOTSPOT_VM_INIT_END(); | |
3617 #endif /* USDT2 */ | |
0 | 3618 |
3619 // record VM initialization completion time | |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3620 #if INCLUDE_MANAGEMENT |
0 | 3621 Management::record_vm_init_completed(); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3622 #endif // INCLUDE_MANAGEMENT |
0 | 3623 |
3624 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3625 // valid exceptions may be thrown in the process. | |
3626 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3627 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3628 // anymore. We call vm_exit_during_initialization directly instead. | |
3629 SystemDictionary::compute_java_system_loader(THREAD); | |
3630 if (HAS_PENDING_EXCEPTION) { | |
3631 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3632 } | |
3633 | |
3634 #ifndef SERIALGC | |
3635 // Support for ConcurrentMarkSweep. This should be cleaned up | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3636 // 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
|
3637 // once things are properly refactored. XXX YSR |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3638 if (UseConcMarkSweepGC || UseG1GC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3639 if (UseConcMarkSweepGC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3640 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3641 } else { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3642 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3643 } |
0 | 3644 if (HAS_PENDING_EXCEPTION) { |
3645 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3646 } | |
3647 } | |
3648 #endif // SERIALGC | |
3649 | |
3650 // Always call even when there are not JVMTI environments yet, since environments | |
3651 // may be attached late and JVMTI must track phases of VM execution | |
3652 JvmtiExport::enter_live_phase(); | |
3653 | |
3654 // Signal Dispatcher needs to be started before VMInit event is posted | |
3655 os::signal_init(); | |
3656 | |
3657 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3658 if (!DisableAttachMechanism) { | |
3659 if (StartAttachListener || AttachListener::init_at_startup()) { | |
3660 AttachListener::init(); | |
3661 } | |
3662 } | |
3663 | |
3664 // Launch -Xrun agents | |
3665 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3666 // back-end can launch with -Xdebug -Xrunjdwp. | |
3667 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3668 create_vm_init_libraries(); | |
3669 } | |
3670 | |
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3671 // 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
|
3672 JvmtiExport::post_vm_initialized(); |
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3673 |
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3674 if (!TRACE_START()) { |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3675 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3676 } |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3677 |
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3678 if (CleanChunkPoolAsync) { |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3679 Chunk::start_chunk_pool_cleaner_task(); |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3680 } |
0 | 3681 |
3682 // initialize compiler(s) | |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3683 #if defined(COMPILER1) || defined(COMPILER2) |
0 | 3684 CompileBroker::compilation_init(); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3685 #endif |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3686 |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3687 #if INCLUDE_MANAGEMENT |
0 | 3688 Management::initialize(THREAD); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3689 #endif // INCLUDE_MANAGEMENT |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3690 |
0 | 3691 if (HAS_PENDING_EXCEPTION) { |
3692 // management agent fails to start possibly due to | |
3693 // configuration problem and is responsible for printing | |
3694 // stack trace if appropriate. Simply exit VM. | |
3695 vm_exit(1); | |
3696 } | |
3697 | |
3698 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3699 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
3700 if (MemProfiling) MemProfiler::engage(); | |
3701 StatSampler::engage(); | |
3702 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3703 | |
3704 BiasedLocking::init(); | |
3705 | |
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3706 if (JDK_Version::current().post_vm_init_hook_enabled()) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3707 call_postVMInitHook(THREAD); |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3708 // The Java side of PostVMInitHook.run must deal with all |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3709 // exceptions and provide means of diagnosis. |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3710 if (HAS_PENDING_EXCEPTION) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3711 CLEAR_PENDING_EXCEPTION; |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3712 } |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3713 } |
0 | 3714 |
6939
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3715 { |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3716 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3717 // Make sure the watcher thread can be started by WatcherThread::start() |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3718 // or by dynamic enrollment. |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3719 WatcherThread::make_startable(); |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3720 // Start up the WatcherThread if there are any periodic tasks |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3721 // NOTE: All PeriodicTasks should be registered by now. If they |
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3722 // aren't, late joiners might appear to start slowly (we might |
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3723 // take a while to process their first tick). |
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3724 if (PeriodicTask::num_tasks() > 0) { |
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3725 WatcherThread::start(); |
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3726 } |
0 | 3727 } |
3728 | |
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3729 // Give os specific code one last chance to start |
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3730 os::init_3(); |
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3731 |
0 | 3732 create_vm_timer.end(); |
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3733 #ifdef ASSERT |
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3734 _vm_complete = true; |
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3735 #endif |
0 | 3736 return JNI_OK; |
3737 } | |
3738 | |
3739 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3740 extern "C" { | |
3741 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3742 } | |
3743 // Find a command line agent library and return its entry point for | |
3744 // -agentlib: -agentpath: -Xrun | |
3745 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3746 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3747 OnLoadEntry_t on_load_entry = NULL; | |
3748 void *library = agent->os_lib(); // check if we have looked it up before | |
3749 | |
3750 if (library == NULL) { | |
3751 char buffer[JVM_MAXPATHLEN]; | |
3752 char ebuf[1024]; | |
3753 const char *name = agent->name(); | |
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3754 const char *msg = "Could not find agent library "; |
0 | 3755 |
3756 if (agent->is_absolute_path()) { | |
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3757 library = os::dll_load(name, ebuf, sizeof ebuf); |
0 | 3758 if (library == NULL) { |
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3759 const char *sub_msg = " in absolute path, with error: "; |
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3760 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3761 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
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3762 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3763 // If we can't find the agent, exit. |
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3764 vm_exit_during_initialization(buf, NULL); |
6197 | 3765 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3766 } |
3767 } else { | |
3768 // Try to load the agent from the standard dll directory | |
6966
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3769 if (os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
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3770 name)) { |
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3771 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
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3772 } |
0 | 3773 #ifdef KERNEL |
3774 // Download instrument dll | |
3775 if (library == NULL && strcmp(name, "instrument") == 0) { | |
3776 char *props = Arguments::get_kernel_properties(); | |
3777 char *home = Arguments::get_java_home(); | |
3778 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
3779 " sun.jkernel.DownloadManager -download client_jvm"; | |
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3780 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
6197 | 3781 char *cmd = NEW_C_HEAP_ARRAY(char, length, mtThread); |
0 | 3782 jio_snprintf(cmd, length, fmt, home, props); |
3783 int status = os::fork_and_exec(cmd); | |
3784 FreeHeap(props); | |
3785 if (status == -1) { | |
3786 warning(cmd); | |
3787 vm_exit_during_initialization("fork_and_exec failed: %s", | |
3788 strerror(errno)); | |
3789 } | |
6197 | 3790 FREE_C_HEAP_ARRAY(char, cmd, mtThread); |
0 | 3791 // when this comes back the instrument.dll should be where it belongs. |
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3792 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3793 } |
3794 #endif // KERNEL | |
3795 if (library == NULL) { // Try the local directory | |
3796 char ns[1] = {0}; | |
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3797 if (os::dll_build_name(buffer, sizeof(buffer), ns, name)) { |
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3798 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
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3799 } |
0 | 3800 if (library == NULL) { |
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3801 const char *sub_msg = " on the library path, with error: "; |
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|
3802 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3803 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
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|
3804 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3805 // If we can't find the agent, exit. |
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|
3806 vm_exit_during_initialization(buf, NULL); |
6197 | 3807 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3808 } |
3809 } | |
3810 } | |
3811 agent->set_os_lib(library); | |
3812 } | |
3813 | |
3814 // Find the OnLoad function. | |
3815 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
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|
3816 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
0 | 3817 if (on_load_entry != NULL) break; |
3818 } | |
3819 return on_load_entry; | |
3820 } | |
3821 | |
3822 // Find the JVM_OnLoad entry point | |
3823 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3824 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3825 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3826 } | |
3827 | |
3828 // Find the Agent_OnLoad entry point | |
3829 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3830 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3831 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3832 } | |
3833 | |
3834 // For backwards compatibility with -Xrun | |
3835 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3836 // treated like -agentpath: | |
3837 // Must be called before agent libraries are created | |
3838 void Threads::convert_vm_init_libraries_to_agents() { | |
3839 AgentLibrary* agent; | |
3840 AgentLibrary* next; | |
3841 | |
3842 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3843 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3844 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3845 | |
3846 // If there is an JVM_OnLoad function it will get called later, | |
3847 // otherwise see if there is an Agent_OnLoad | |
3848 if (on_load_entry == NULL) { | |
3849 on_load_entry = lookup_agent_on_load(agent); | |
3850 if (on_load_entry != NULL) { | |
3851 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3852 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3853 Arguments::convert_library_to_agent(agent); | |
3854 } else { | |
3855 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3856 } | |
3857 } | |
3858 } | |
3859 } | |
3860 | |
3861 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3862 // Invokes Agent_OnLoad | |
3863 // Called very early -- before JavaThreads exist | |
3864 void Threads::create_vm_init_agents() { | |
3865 extern struct JavaVM_ main_vm; | |
3866 AgentLibrary* agent; | |
3867 | |
3868 JvmtiExport::enter_onload_phase(); | |
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3869 |
0 | 3870 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { |
3871 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3872 | |
3873 if (on_load_entry != NULL) { | |
3874 // Invoke the Agent_OnLoad function | |
3875 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3876 if (err != JNI_OK) { | |
3877 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3878 } | |
3879 } else { | |
3880 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3881 } | |
3882 } | |
3883 JvmtiExport::enter_primordial_phase(); | |
3884 } | |
3885 | |
3886 extern "C" { | |
3887 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3888 } | |
3889 | |
3890 void Threads::shutdown_vm_agents() { | |
3891 // Send any Agent_OnUnload notifications | |
3892 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
3893 extern struct JavaVM_ main_vm; | |
3894 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3895 | |
3896 // Find the Agent_OnUnload function. | |
3897 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
3898 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
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|
3899 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
0 | 3900 |
3901 // Invoke the Agent_OnUnload function | |
3902 if (unload_entry != NULL) { | |
3903 JavaThread* thread = JavaThread::current(); | |
3904 ThreadToNativeFromVM ttn(thread); | |
3905 HandleMark hm(thread); | |
3906 (*unload_entry)(&main_vm); | |
3907 break; | |
3908 } | |
3909 } | |
3910 } | |
3911 } | |
3912 | |
3913 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3914 // Invokes JVM_OnLoad | |
3915 void Threads::create_vm_init_libraries() { | |
3916 extern struct JavaVM_ main_vm; | |
3917 AgentLibrary* agent; | |
3918 | |
3919 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3920 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3921 | |
3922 if (on_load_entry != NULL) { | |
3923 // Invoke the JVM_OnLoad function | |
3924 JavaThread* thread = JavaThread::current(); | |
3925 ThreadToNativeFromVM ttn(thread); | |
3926 HandleMark hm(thread); | |
3927 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3928 if (err != JNI_OK) { | |
3929 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3930 } | |
3931 } else { | |
3932 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3933 } | |
3934 } | |
3935 } | |
3936 | |
3937 // Last thread running calls java.lang.Shutdown.shutdown() | |
3938 void JavaThread::invoke_shutdown_hooks() { | |
3939 HandleMark hm(this); | |
3940 | |
3941 // We could get here with a pending exception, if so clear it now. | |
3942 if (this->has_pending_exception()) { | |
3943 this->clear_pending_exception(); | |
3944 } | |
3945 | |
3946 EXCEPTION_MARK; | |
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3947 Klass* k = |
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3948 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
0 | 3949 THREAD); |
3950 if (k != NULL) { | |
3951 // SystemDictionary::resolve_or_null will return null if there was | |
3952 // an exception. If we cannot load the Shutdown class, just don't | |
3953 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3954 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3955 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3956 // was called, the Shutdown class would have already been loaded | |
3957 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3958 instanceKlassHandle shutdown_klass (THREAD, k); | |
3959 JavaValue result(T_VOID); | |
3960 JavaCalls::call_static(&result, | |
3961 shutdown_klass, | |
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3962 vmSymbols::shutdown_method_name(), |
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3963 vmSymbols::void_method_signature(), |
0 | 3964 THREAD); |
3965 } | |
3966 CLEAR_PENDING_EXCEPTION; | |
3967 } | |
3968 | |
3969 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3970 // the program falls off the end of main(). Another VM exit path is through | |
3971 // vm_exit() when the program calls System.exit() to return a value or when | |
3972 // there is a serious error in VM. The two shutdown paths are not exactly | |
3973 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3974 // and VM_Exit op at VM level. | |
3975 // | |
3976 // Shutdown sequence: | |
6197 | 3977 // + Shutdown native memory tracking if it is on |
0 | 3978 // + Wait until we are the last non-daemon thread to execute |
3979 // <-- every thing is still working at this moment --> | |
3980 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3981 // shutdown hooks, run finalizers if finalization-on-exit | |
3982 // + Call before_exit(), prepare for VM exit | |
3983 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3984 // currently the only user of this mechanism is File.deleteOnExit()) | |
3985 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3986 // post thread end and vm death events to JVMTI, | |
3987 // stop signal thread | |
3988 // + Call JavaThread::exit(), it will: | |
3989 // > release JNI handle blocks, remove stack guard pages | |
3990 // > remove this thread from Threads list | |
3991 // <-- no more Java code from this thread after this point --> | |
3992 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3993 // the compiler threads at safepoint | |
3994 // <-- do not use anything that could get blocked by Safepoint --> | |
3995 // + Disable tracing at JNI/JVM barriers | |
3996 // + Set _vm_exited flag for threads that are still running native code | |
3997 // + Delete this thread | |
3998 // + Call exit_globals() | |
3999 // > deletes tty | |
4000 // > deletes PerfMemory resources | |
4001 // + Return to caller | |
4002 | |
4003 bool Threads::destroy_vm() { | |
4004 JavaThread* thread = JavaThread::current(); | |
4005 | |
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4006 #ifdef ASSERT |
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4007 _vm_complete = false; |
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4008 #endif |
0 | 4009 // Wait until we are the last non-daemon thread to execute |
4010 { MutexLocker nu(Threads_lock); | |
4011 while (Threads::number_of_non_daemon_threads() > 1 ) | |
4012 // This wait should make safepoint checks, wait without a timeout, | |
4013 // and wait as a suspend-equivalent condition. | |
4014 // | |
4015 // Note: If the FlatProfiler is running and this thread is waiting | |
4016 // for another non-daemon thread to finish, then the FlatProfiler | |
4017 // is waiting for the external suspend request on this thread to | |
4018 // complete. wait_for_ext_suspend_completion() will eventually | |
4019 // timeout, but that takes time. Making this wait a suspend- | |
4020 // equivalent condition solves that timeout problem. | |
4021 // | |
4022 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
4023 Mutex::_as_suspend_equivalent_flag); | |
4024 } | |
4025 | |
6197 | 4026 // Shutdown NMT before exit. Otherwise, |
4027 // it will run into trouble when system destroys static variables. | |
4028 MemTracker::shutdown(MemTracker::NMT_normal); | |
4029 | |
0 | 4030 // Hang forever on exit if we are reporting an error. |
4031 if (ShowMessageBoxOnError && is_error_reported()) { | |
4032 os::infinite_sleep(); | |
4033 } | |
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4034 os::wait_for_keypress_at_exit(); |
0 | 4035 |
4036 if (JDK_Version::is_jdk12x_version()) { | |
4037 // We are the last thread running, so check if finalizers should be run. | |
4038 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
4039 HandleMark rm(thread); | |
4040 Universe::run_finalizers_on_exit(); | |
4041 } else { | |
4042 // run Java level shutdown hooks | |
4043 thread->invoke_shutdown_hooks(); | |
4044 } | |
4045 | |
4046 before_exit(thread); | |
4047 | |
4048 thread->exit(true); | |
4049 | |
4050 // Stop VM thread. | |
4051 { | |
4052 // 4945125 The vm thread comes to a safepoint during exit. | |
4053 // GC vm_operations can get caught at the safepoint, and the | |
4054 // heap is unparseable if they are caught. Grab the Heap_lock | |
4055 // to prevent this. The GC vm_operations will not be able to | |
4056 // queue until after the vm thread is dead. | |
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4057 // After this point, we'll never emerge out of the safepoint before |
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4058 // the VM exits, so concurrent GC threads do not need to be explicitly |
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|
4059 // stopped; they remain inactive until the process exits. |
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4060 // Note: some concurrent G1 threads may be running during a safepoint, |
ef2d1b8f2dd4
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|
4061 // but these will not be accessing the heap, just some G1-specific side |
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|
4062 // data structures that are not accessed by any other threads but them |
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4063 // after this point in a terminal safepoint. |
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4064 |
0 | 4065 MutexLocker ml(Heap_lock); |
4066 | |
4067 VMThread::wait_for_vm_thread_exit(); | |
4068 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
4069 VMThread::destroy(); | |
4070 } | |
4071 | |
4072 // clean up ideal graph printers | |
4073 #if defined(COMPILER2) && !defined(PRODUCT) | |
4074 IdealGraphPrinter::clean_up(); | |
4075 #endif | |
4076 | |
4077 // Now, all Java threads are gone except daemon threads. Daemon threads | |
4078 // running Java code or in VM are stopped by the Safepoint. However, | |
4079 // daemon threads executing native code are still running. But they | |
4080 // will be stopped at native=>Java/VM barriers. Note that we can't | |
4081 // simply kill or suspend them, as it is inherently deadlock-prone. | |
4082 | |
4083 #ifndef PRODUCT | |
4084 // disable function tracing at JNI/JVM barriers | |
4085 TraceJNICalls = false; | |
4086 TraceJVMCalls = false; | |
4087 TraceRuntimeCalls = false; | |
4088 #endif | |
4089 | |
4090 VM_Exit::set_vm_exited(); | |
4091 | |
4092 notify_vm_shutdown(); | |
4093 | |
4094 delete thread; | |
4095 | |
4096 // exit_globals() will delete tty | |
4097 exit_globals(); | |
4098 | |
4099 return true; | |
4100 } | |
4101 | |
4102 | |
4103 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
4104 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
4105 return is_supported_jni_version(version); | |
4106 } | |
4107 | |
4108 | |
4109 jboolean Threads::is_supported_jni_version(jint version) { | |
4110 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
4111 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
4112 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
4113 return JNI_FALSE; | |
4114 } | |
4115 | |
4116 | |
4117 void Threads::add(JavaThread* p, bool force_daemon) { | |
4118 // The threads lock must be owned at this point | |
4119 assert_locked_or_safepoint(Threads_lock); | |
1842
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4120 |
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4121 // See the comment for this method in thread.hpp for its purpose and |
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4122 // why it is called here. |
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4123 p->initialize_queues(); |
0 | 4124 p->set_next(_thread_list); |
4125 _thread_list = p; | |
4126 _number_of_threads++; | |
4127 oop threadObj = p->threadObj(); | |
4128 bool daemon = true; | |
4129 // Bootstrapping problem: threadObj can be null for initial | |
4130 // JavaThread (or for threads attached via JNI) | |
4131 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
4132 _number_of_non_daemon_threads++; | |
4133 daemon = false; | |
4134 } | |
4135 | |
6197 | 4136 p->set_safepoint_visible(true); |
4137 | |
0 | 4138 ThreadService::add_thread(p, daemon); |
4139 | |
4140 // Possible GC point. | |
4872
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4141 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
0 | 4142 } |
4143 | |
4144 void Threads::remove(JavaThread* p) { | |
4145 // Extra scope needed for Thread_lock, so we can check | |
4146 // that we do not remove thread without safepoint code notice | |
4147 { MutexLocker ml(Threads_lock); | |
4148 | |
4149 assert(includes(p), "p must be present"); | |
4150 | |
4151 JavaThread* current = _thread_list; | |
4152 JavaThread* prev = NULL; | |
4153 | |
4154 while (current != p) { | |
4155 prev = current; | |
4156 current = current->next(); | |
4157 } | |
4158 | |
4159 if (prev) { | |
4160 prev->set_next(current->next()); | |
4161 } else { | |
4162 _thread_list = p->next(); | |
4163 } | |
4164 _number_of_threads--; | |
4165 oop threadObj = p->threadObj(); | |
4166 bool daemon = true; | |
4167 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
4168 _number_of_non_daemon_threads--; | |
4169 daemon = false; | |
4170 | |
4171 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
4172 // on destroy_vm will wake up. | |
4173 if (number_of_non_daemon_threads() == 1) | |
4174 Threads_lock->notify_all(); | |
4175 } | |
4176 ThreadService::remove_thread(p, daemon); | |
4177 | |
4178 // Make sure that safepoint code disregard this thread. This is needed since | |
4179 // the thread might mess around with locks after this point. This can cause it | |
4180 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
4181 // of this thread since it is removed from the queue. | |
4182 p->set_terminated_value(); | |
6197 | 4183 |
4184 // Now, this thread is not visible to safepoint | |
4185 p->set_safepoint_visible(false); | |
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4186 // once the thread becomes safepoint invisible, we can not use its per-thread |
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4187 // recorder. And Threads::do_threads() no longer walks this thread, so we have |
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4188 // to release its per-thread recorder here. |
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|
4189 MemTracker::thread_exiting(p); |
0 | 4190 } // unlock Threads_lock |
4191 | |
4192 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
4872
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4193 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
0 | 4194 } |
4195 | |
4196 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
4197 bool Threads::includes(JavaThread* p) { | |
4198 assert(Threads_lock->is_locked(), "sanity check"); | |
4199 ALL_JAVA_THREADS(q) { | |
4200 if (q == p ) { | |
4201 return true; | |
4202 } | |
4203 } | |
4204 return false; | |
4205 } | |
4206 | |
4207 // Operations on the Threads list for GC. These are not explicitly locked, | |
4208 // but the garbage collector must provide a safe context for them to run. | |
4209 // In particular, these things should never be called when the Threads_lock | |
4210 // is held by some other thread. (Note: the Safepoint abstraction also | |
4211 // uses the Threads_lock to gurantee this property. It also makes sure that | |
4212 // all threads gets blocked when exiting or starting). | |
4213 | |
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4214 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 4215 ALL_JAVA_THREADS(p) { |
989
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4216 p->oops_do(f, cf); |
0 | 4217 } |
989
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4218 VMThread::vm_thread()->oops_do(f, cf); |
0 | 4219 } |
4220 | |
989
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4221 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 4222 // Introduce a mechanism allowing parallel threads to claim threads as |
4223 // root groups. Overhead should be small enough to use all the time, | |
4224 // even in sequential code. | |
4225 SharedHeap* sh = SharedHeap::heap(); | |
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4226 // Cannot yet substitute active_workers for n_par_threads |
bca17e38de00
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4227 // because of G1CollectedHeap::verify() use of |
bca17e38de00
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|
4228 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4229 // turn off parallelism in process_strong_roots while active_workers |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4230 // is being used for parallelism elsewhere. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4231 bool is_par = sh->n_par_threads() > 0; |
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|
4232 assert(!is_par || |
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|
4233 (SharedHeap::heap()->n_par_threads() == |
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|
4234 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
0 | 4235 int cp = SharedHeap::heap()->strong_roots_parity(); |
4236 ALL_JAVA_THREADS(p) { | |
4237 if (p->claim_oops_do(is_par, cp)) { | |
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|
4238 p->oops_do(f, cf); |
0 | 4239 } |
4240 } | |
4241 VMThread* vmt = VMThread::vm_thread(); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4242 if (vmt->claim_oops_do(is_par, cp)) { |
989
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|
4243 vmt->oops_do(f, cf); |
3979
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6484982: G1: process references during evacuation pauses
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|
4244 } |
0 | 4245 } |
4246 | |
4247 #ifndef SERIALGC | |
4248 // Used by ParallelScavenge | |
4249 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
4250 ALL_JAVA_THREADS(p) { | |
4251 q->enqueue(new ThreadRootsTask(p)); | |
4252 } | |
4253 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
4254 } | |
4255 | |
4256 // Used by Parallel Old | |
4257 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
4258 ALL_JAVA_THREADS(p) { | |
4259 q->enqueue(new ThreadRootsMarkingTask(p)); | |
4260 } | |
4261 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
4262 } | |
4263 #endif // SERIALGC | |
4264 | |
989
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changeset
|
4265 void Threads::nmethods_do(CodeBlobClosure* cf) { |
0 | 4266 ALL_JAVA_THREADS(p) { |
989
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6863023: need non-perm oops in code cache for JSR 292
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diff
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|
4267 p->nmethods_do(cf); |
0 | 4268 } |
989
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6863023: need non-perm oops in code cache for JSR 292
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diff
changeset
|
4269 VMThread::vm_thread()->nmethods_do(cf); |
0 | 4270 } |
4271 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
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|
4272 void Threads::metadata_do(void f(Metadata*)) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
4273 ALL_JAVA_THREADS(p) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
4274 p->metadata_do(f); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
4275 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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|
4276 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
4277 |
0 | 4278 void Threads::gc_epilogue() { |
4279 ALL_JAVA_THREADS(p) { | |
4280 p->gc_epilogue(); | |
4281 } | |
4282 } | |
4283 | |
4284 void Threads::gc_prologue() { | |
4285 ALL_JAVA_THREADS(p) { | |
4286 p->gc_prologue(); | |
4287 } | |
4288 } | |
4289 | |
4290 void Threads::deoptimized_wrt_marked_nmethods() { | |
4291 ALL_JAVA_THREADS(p) { | |
4292 p->deoptimized_wrt_marked_nmethods(); | |
4293 } | |
4294 } | |
4295 | |
4296 | |
4297 // Get count Java threads that are waiting to enter the specified monitor. | |
4298 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
4299 address monitor, bool doLock) { | |
4300 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
4301 "must grab Threads_lock or be at safepoint"); | |
4302 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
4303 | |
4304 int i = 0; | |
4305 { | |
4306 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4307 ALL_JAVA_THREADS(p) { | |
4308 if (p->is_Compiler_thread()) continue; | |
4309 | |
4310 address pending = (address)p->current_pending_monitor(); | |
4311 if (pending == monitor) { // found a match | |
4312 if (i < count) result->append(p); // save the first count matches | |
4313 i++; | |
4314 } | |
4315 } | |
4316 } | |
4317 return result; | |
4318 } | |
4319 | |
4320 | |
4321 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
4322 assert(doLock || | |
4323 Threads_lock->owned_by_self() || | |
4324 SafepointSynchronize::is_at_safepoint(), | |
4325 "must grab Threads_lock or be at safepoint"); | |
4326 | |
4327 // NULL owner means not locked so we can skip the search | |
4328 if (owner == NULL) return NULL; | |
4329 | |
4330 { | |
4331 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4332 ALL_JAVA_THREADS(p) { | |
4333 // first, see if owner is the address of a Java thread | |
4334 if (owner == (address)p) return p; | |
4335 } | |
4336 } | |
4337 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
4338 if (UseHeavyMonitors) return NULL; | |
4339 | |
4340 // | |
4341 // If we didn't find a matching Java thread and we didn't force use of | |
4342 // heavyweight monitors, then the owner is the stack address of the | |
4343 // Lock Word in the owning Java thread's stack. | |
4344 // | |
4345 JavaThread* the_owner = NULL; | |
4346 { | |
4347 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4348 ALL_JAVA_THREADS(q) { | |
702
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6699669: Hotspot server leaves synchronized block with monitor in bad state
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|
4349 if (q->is_lock_owned(owner)) { |
0 | 4350 the_owner = q; |
702
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|
4351 break; |
0 | 4352 } |
4353 } | |
4354 } | |
4355 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
4356 return the_owner; | |
4357 } | |
4358 | |
4359 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
4360 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
4361 char buf[32]; | |
4362 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
4363 | |
4364 st->print_cr("Full thread dump %s (%s %s):", | |
4365 Abstract_VM_Version::vm_name(), | |
4366 Abstract_VM_Version::vm_release(), | |
4367 Abstract_VM_Version::vm_info_string() | |
4368 ); | |
4369 st->cr(); | |
4370 | |
4371 #ifndef SERIALGC | |
4372 // Dump concurrent locks | |
4373 ConcurrentLocksDump concurrent_locks; | |
4374 if (print_concurrent_locks) { | |
4375 concurrent_locks.dump_at_safepoint(); | |
4376 } | |
4377 #endif // SERIALGC | |
4378 | |
4379 ALL_JAVA_THREADS(p) { | |
4380 ResourceMark rm; | |
4381 p->print_on(st); | |
4382 if (print_stacks) { | |
4383 if (internal_format) { | |
4384 p->trace_stack(); | |
4385 } else { | |
4386 p->print_stack_on(st); | |
4387 } | |
4388 } | |
4389 st->cr(); | |
4390 #ifndef SERIALGC | |
4391 if (print_concurrent_locks) { | |
4392 concurrent_locks.print_locks_on(p, st); | |
4393 } | |
4394 #endif // SERIALGC | |
4395 } | |
4396 | |
4397 VMThread::vm_thread()->print_on(st); | |
4398 st->cr(); | |
4399 Universe::heap()->print_gc_threads_on(st); | |
4400 WatcherThread* wt = WatcherThread::watcher_thread(); | |
6766 | 4401 if (wt != NULL) { |
4402 wt->print_on(st); | |
4403 st->cr(); | |
4404 } | |
0 | 4405 CompileBroker::print_compiler_threads_on(st); |
4406 st->flush(); | |
4407 } | |
4408 | |
4409 // Threads::print_on_error() is called by fatal error handler. It's possible | |
4410 // that VM is not at safepoint and/or current thread is inside signal handler. | |
4411 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
4412 // memory (even in resource area), it might deadlock the error handler. | |
4413 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
4414 bool found_current = false; | |
4415 st->print_cr("Java Threads: ( => current thread )"); | |
4416 ALL_JAVA_THREADS(thread) { | |
4417 bool is_current = (current == thread); | |
4418 found_current = found_current || is_current; | |
4419 | |
4420 st->print("%s", is_current ? "=>" : " "); | |
4421 | |
4422 st->print(PTR_FORMAT, thread); | |
4423 st->print(" "); | |
4424 thread->print_on_error(st, buf, buflen); | |
4425 st->cr(); | |
4426 } | |
4427 st->cr(); | |
4428 | |
4429 st->print_cr("Other Threads:"); | |
4430 if (VMThread::vm_thread()) { | |
4431 bool is_current = (current == VMThread::vm_thread()); | |
4432 found_current = found_current || is_current; | |
4433 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
4434 | |
4435 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
4436 st->print(" "); | |
4437 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
4438 st->cr(); | |
4439 } | |
4440 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4441 if (wt != NULL) { | |
4442 bool is_current = (current == wt); | |
4443 found_current = found_current || is_current; | |
4444 st->print("%s", is_current ? "=>" : " "); | |
4445 | |
4446 st->print(PTR_FORMAT, wt); | |
4447 st->print(" "); | |
4448 wt->print_on_error(st, buf, buflen); | |
4449 st->cr(); | |
4450 } | |
4451 if (!found_current) { | |
4452 st->cr(); | |
4453 st->print("=>" PTR_FORMAT " (exited) ", current); | |
4454 current->print_on_error(st, buf, buflen); | |
4455 st->cr(); | |
4456 } | |
4457 } | |
4458 | |
1878 | 4459 // Internal SpinLock and Mutex |
4460 // Based on ParkEvent | |
4461 | |
4462 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
0 | 4463 // |
1878 | 4464 // We employ SpinLocks _only for low-contention, fixed-length |
4465 // short-duration critical sections where we're concerned | |
4466 // about native mutex_t or HotSpot Mutex:: latency. | |
4467 // The mux construct provides a spin-then-block mutual exclusion | |
4468 // mechanism. | |
4469 // | |
4470 // Testing has shown that contention on the ListLock guarding gFreeList | |
4471 // is common. If we implement ListLock as a simple SpinLock it's common | |
4472 // for the JVM to devolve to yielding with little progress. This is true | |
4473 // despite the fact that the critical sections protected by ListLock are | |
4474 // extremely short. | |
0 | 4475 // |
1878 | 4476 // TODO-FIXME: ListLock should be of type SpinLock. |
4477 // We should make this a 1st-class type, integrated into the lock | |
4478 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
4479 // should have sufficient padding to avoid false-sharing and excessive | |
4480 // cache-coherency traffic. | |
4481 | |
4482 | |
4483 typedef volatile int SpinLockT ; | |
4484 | |
4485 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
4486 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
4487 return ; // normal fast-path return | |
4488 } | |
4489 | |
4490 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
4491 TEVENT (SpinAcquire - ctx) ; | |
4492 int ctr = 0 ; | |
4493 int Yields = 0 ; | |
0 | 4494 for (;;) { |
1878 | 4495 while (*adr != 0) { |
4496 ++ctr ; | |
4497 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
4498 if (Yields > 5) { | |
4499 // Consider using a simple NakedSleep() instead. | |
4500 // Then SpinAcquire could be called by non-JVM threads | |
4501 Thread::current()->_ParkEvent->park(1) ; | |
4502 } else { | |
4503 os::NakedYield() ; | |
4504 ++Yields ; | |
4505 } | |
4506 } else { | |
4507 SpinPause() ; | |
0 | 4508 } |
1878 | 4509 } |
4510 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
0 | 4511 } |
4512 } | |
4513 | |
1878 | 4514 void Thread::SpinRelease (volatile int * adr) { |
4515 assert (*adr != 0, "invariant") ; | |
4516 OrderAccess::fence() ; // guarantee at least release consistency. | |
4517 // Roach-motel semantics. | |
4518 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
4519 // but prior LDs and STs within the critical section can't be allowed | |
4520 // to reorder or float past the ST that releases the lock. | |
4521 *adr = 0 ; | |
0 | 4522 } |
4523 | |
1878 | 4524 // muxAcquire and muxRelease: |
4525 // | |
4526 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
4527 // The LSB of the word is set IFF the lock is held. | |
4528 // The remainder of the word points to the head of a singly-linked list | |
4529 // of threads blocked on the lock. | |
4530 // | |
4531 // * The current implementation of muxAcquire-muxRelease uses its own | |
4532 // dedicated Thread._MuxEvent instance. If we're interested in | |
4533 // minimizing the peak number of extant ParkEvent instances then | |
4534 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
4535 // as certain invariants were satisfied. Specifically, care would need | |
4536 // to be taken with regards to consuming unpark() "permits". | |
4537 // A safe rule of thumb is that a thread would never call muxAcquire() | |
4538 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
4539 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
4540 // consume an unpark() permit intended for monitorenter, for instance. | |
4541 // One way around this would be to widen the restricted-range semaphore | |
4542 // implemented in park(). Another alternative would be to provide | |
4543 // multiple instances of the PlatformEvent() for each thread. One | |
4544 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
4545 // | |
4546 // * Usage: | |
4547 // -- Only as leaf locks | |
4548 // -- for short-term locking only as muxAcquire does not perform | |
4549 // thread state transitions. | |
4550 // | |
4551 // Alternatives: | |
4552 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
4553 // but with parking or spin-then-park instead of pure spinning. | |
4554 // * Use Taura-Oyama-Yonenzawa locks. | |
4555 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
4556 // (List,LockByte). Acquire will CAS the full lockword while Release | |
4557 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
4558 // acquiring threads use timers (ParkTimed) to detect and recover from | |
4559 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
4560 // boundaries by using placement-new. | |
4561 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
4562 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
4563 // The validity of the backlinks must be ratified before we trust the value. | |
4564 // If the backlinks are invalid the exiting thread must back-track through the | |
4565 // the forward links, which are always trustworthy. | |
4566 // * Add a successor indication. The LockWord is currently encoded as | |
4567 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
4568 // to provide the usual futile-wakeup optimization. | |
4569 // See RTStt for details. | |
4570 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
4571 // | |
4572 | |
4573 | |
4574 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
4575 enum MuxBits { LOCKBIT = 1 } ; | |
4576 | |
4577 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
4578 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4579 if (w == 0) return ; | |
4580 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4581 return ; | |
4582 } | |
4583 | |
4584 TEVENT (muxAcquire - Contention) ; | |
4585 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
4586 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
0 | 4587 for (;;) { |
1878 | 4588 int its = (os::is_MP() ? 100 : 0) + 1 ; |
4589 | |
4590 // Optional spin phase: spin-then-park strategy | |
4591 while (--its >= 0) { | |
4592 w = *Lock ; | |
4593 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4594 return ; | |
4595 } | |
4596 } | |
4597 | |
4598 Self->reset() ; | |
4599 Self->OnList = intptr_t(Lock) ; | |
4600 // The following fence() isn't _strictly necessary as the subsequent | |
4601 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4602 OrderAccess::fence(); | |
4603 for (;;) { | |
4604 w = *Lock ; | |
4605 if ((w & LOCKBIT) == 0) { | |
4606 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4607 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
4608 return ; | |
4609 } | |
4610 continue ; // Interference -- *Lock changed -- Just retry | |
0 | 4611 } |
1878 | 4612 assert (w & LOCKBIT, "invariant") ; |
4613 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4614 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
4615 } | |
4616 | |
4617 while (Self->OnList != 0) { | |
4618 Self->park() ; | |
4619 } | |
0 | 4620 } |
4621 } | |
4622 | |
1878 | 4623 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
4624 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4625 if (w == 0) return ; | |
4626 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4627 return ; | |
4628 } | |
4629 | |
4630 TEVENT (muxAcquire - Contention) ; | |
4631 ParkEvent * ReleaseAfter = NULL ; | |
4632 if (ev == NULL) { | |
4633 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
4634 } | |
4635 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
4636 for (;;) { | |
4637 guarantee (ev->OnList == 0, "invariant") ; | |
4638 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
4639 | |
4640 // Optional spin phase: spin-then-park strategy | |
4641 while (--its >= 0) { | |
4642 w = *Lock ; | |
4643 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4644 if (ReleaseAfter != NULL) { | |
4645 ParkEvent::Release (ReleaseAfter) ; | |
4646 } | |
4647 return ; | |
4648 } | |
4649 } | |
4650 | |
4651 ev->reset() ; | |
4652 ev->OnList = intptr_t(Lock) ; | |
4653 // The following fence() isn't _strictly necessary as the subsequent | |
4654 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4655 OrderAccess::fence(); | |
4656 for (;;) { | |
4657 w = *Lock ; | |
4658 if ((w & LOCKBIT) == 0) { | |
4659 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4660 ev->OnList = 0 ; | |
4661 // We call ::Release while holding the outer lock, thus | |
4662 // artificially lengthening the critical section. | |
4663 // Consider deferring the ::Release() until the subsequent unlock(), | |
4664 // after we've dropped the outer lock. | |
4665 if (ReleaseAfter != NULL) { | |
4666 ParkEvent::Release (ReleaseAfter) ; | |
4667 } | |
4668 return ; | |
4669 } | |
4670 continue ; // Interference -- *Lock changed -- Just retry | |
4671 } | |
4672 assert (w & LOCKBIT, "invariant") ; | |
4673 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4674 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
4675 } | |
4676 | |
4677 while (ev->OnList != 0) { | |
4678 ev->park() ; | |
4679 } | |
4680 } | |
4681 } | |
4682 | |
4683 // Release() must extract a successor from the list and then wake that thread. | |
4684 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
4685 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
4686 // Release() would : | |
4687 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
4688 // (B) Extract a successor from the private list "in-hand" | |
4689 // (C) attempt to CAS() the residual back into *Lock over null. | |
4690 // If there were any newly arrived threads and the CAS() would fail. | |
4691 // In that case Release() would detach the RATs, re-merge the list in-hand | |
4692 // with the RATs and repeat as needed. Alternately, Release() might | |
4693 // detach and extract a successor, but then pass the residual list to the wakee. | |
4694 // The wakee would be responsible for reattaching and remerging before it | |
4695 // competed for the lock. | |
4696 // | |
4697 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
4698 // multiple concurrent pushers, but only one popper or detacher. | |
4699 // This implementation pops from the head of the list. This is unfair, | |
4700 // but tends to provide excellent throughput as hot threads remain hot. | |
4701 // (We wake recently run threads first). | |
4702 | |
4703 void Thread::muxRelease (volatile intptr_t * Lock) { | |
4704 for (;;) { | |
4705 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
4706 assert (w & LOCKBIT, "invariant") ; | |
4707 if (w == LOCKBIT) return ; | |
4708 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
4709 assert (List != NULL, "invariant") ; | |
4710 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
4711 ParkEvent * nxt = List->ListNext ; | |
4712 | |
4713 // The following CAS() releases the lock and pops the head element. | |
4714 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
4715 continue ; | |
4716 } | |
4717 List->OnList = 0 ; | |
4718 OrderAccess::fence() ; | |
4719 List->unpark () ; | |
4720 return ; | |
4721 } | |
4722 } | |
4723 | |
4724 | |
0 | 4725 void Threads::verify() { |
4726 ALL_JAVA_THREADS(p) { | |
4727 p->verify(); | |
4728 } | |
4729 VMThread* thread = VMThread::vm_thread(); | |
4730 if (thread != NULL) thread->verify(); | |
4731 } |