Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/thread.cpp @ 14692:8504393de66b
8037043: put Method flag bits in predictable positions
Reviewed-by: kvn, coleenp
author | twisti |
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date | Tue, 11 Mar 2014 14:54:47 -0700 |
parents | c0774726073e |
children | b51e29501f30 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "code/scopeDesc.hpp" | |
31 #include "compiler/compileBroker.hpp" | |
32 #include "interpreter/interpreter.hpp" | |
33 #include "interpreter/linkResolver.hpp" | |
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34 #include "interpreter/oopMapCache.hpp" |
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35 #include "jvmtifiles/jvmtiEnv.hpp" |
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36 #include "memory/gcLocker.inline.hpp" |
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37 #include "memory/metaspaceShared.hpp" |
1972 | 38 #include "memory/oopFactory.hpp" |
39 #include "memory/universe.inline.hpp" | |
40 #include "oops/instanceKlass.hpp" | |
41 #include "oops/objArrayOop.hpp" | |
42 #include "oops/oop.inline.hpp" | |
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43 #include "oops/symbol.hpp" |
1972 | 44 #include "prims/jvm_misc.hpp" |
45 #include "prims/jvmtiExport.hpp" | |
46 #include "prims/jvmtiThreadState.hpp" | |
47 #include "prims/privilegedStack.hpp" | |
48 #include "runtime/arguments.hpp" | |
49 #include "runtime/biasedLocking.hpp" | |
50 #include "runtime/deoptimization.hpp" | |
51 #include "runtime/fprofiler.hpp" | |
52 #include "runtime/frame.inline.hpp" | |
53 #include "runtime/init.hpp" | |
54 #include "runtime/interfaceSupport.hpp" | |
55 #include "runtime/java.hpp" | |
56 #include "runtime/javaCalls.hpp" | |
57 #include "runtime/jniPeriodicChecker.hpp" | |
58 #include "runtime/memprofiler.hpp" | |
59 #include "runtime/mutexLocker.hpp" | |
60 #include "runtime/objectMonitor.hpp" | |
61 #include "runtime/osThread.hpp" | |
62 #include "runtime/safepoint.hpp" | |
63 #include "runtime/sharedRuntime.hpp" | |
64 #include "runtime/statSampler.hpp" | |
65 #include "runtime/stubRoutines.hpp" | |
66 #include "runtime/task.hpp" | |
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67 #include "runtime/thread.inline.hpp" |
1972 | 68 #include "runtime/threadCritical.hpp" |
69 #include "runtime/threadLocalStorage.hpp" | |
70 #include "runtime/vframe.hpp" | |
71 #include "runtime/vframeArray.hpp" | |
72 #include "runtime/vframe_hp.hpp" | |
73 #include "runtime/vmThread.hpp" | |
74 #include "runtime/vm_operations.hpp" | |
75 #include "services/attachListener.hpp" | |
76 #include "services/management.hpp" | |
6197 | 77 #include "services/memTracker.hpp" |
1972 | 78 #include "services/threadService.hpp" |
10405 | 79 #include "trace/tracing.hpp" |
80 #include "trace/traceMacros.hpp" | |
1972 | 81 #include "utilities/defaultStream.hpp" |
82 #include "utilities/dtrace.hpp" | |
83 #include "utilities/events.hpp" | |
84 #include "utilities/preserveException.hpp" | |
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85 #include "utilities/macros.hpp" |
1972 | 86 #ifdef TARGET_OS_FAMILY_linux |
87 # include "os_linux.inline.hpp" | |
88 #endif | |
89 #ifdef TARGET_OS_FAMILY_solaris | |
90 # include "os_solaris.inline.hpp" | |
91 #endif | |
92 #ifdef TARGET_OS_FAMILY_windows | |
93 # include "os_windows.inline.hpp" | |
94 #endif | |
3960 | 95 #ifdef TARGET_OS_FAMILY_bsd |
96 # include "os_bsd.inline.hpp" | |
97 #endif | |
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98 #if INCLUDE_ALL_GCS |
1972 | 99 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" |
100 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
101 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
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102 #endif // INCLUDE_ALL_GCS |
1972 | 103 #ifdef COMPILER1 |
104 #include "c1/c1_Compiler.hpp" | |
105 #endif | |
106 #ifdef COMPILER2 | |
107 #include "opto/c2compiler.hpp" | |
108 #include "opto/idealGraphPrinter.hpp" | |
109 #endif | |
0 | 110 |
111 #ifdef DTRACE_ENABLED | |
112 | |
113 // Only bother with this argument setup if dtrace is available | |
114 | |
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115 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_START |
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116 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_STOP |
4006 | 117 |
118 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
119 { \ | |
120 ResourceMark rm(this); \ | |
121 int len = 0; \ | |
122 const char* name = (javathread)->get_thread_name(); \ | |
123 len = strlen(name); \ | |
124 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
125 (char *) name, len, \ | |
126 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
127 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
128 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
129 } | |
130 | |
0 | 131 #else // ndef DTRACE_ENABLED |
132 | |
133 #define DTRACE_THREAD_PROBE(probe, javathread) | |
134 | |
135 #endif // ndef DTRACE_ENABLED | |
136 | |
6197 | 137 |
0 | 138 // Class hierarchy |
139 // - Thread | |
140 // - VMThread | |
141 // - WatcherThread | |
142 // - ConcurrentMarkSweepThread | |
143 // - JavaThread | |
144 // - CompilerThread | |
145 | |
146 // ======= Thread ======== | |
147 // Support for forcing alignment of thread objects for biased locking | |
6197 | 148 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
0 | 149 if (UseBiasedLocking) { |
150 const int alignment = markOopDesc::biased_lock_alignment; | |
151 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
6197 | 152 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
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153 : AllocateHeap(aligned_size, flags, CURRENT_PC, |
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154 AllocFailStrategy::RETURN_NULL); |
0 | 155 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
156 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
157 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
158 "JavaThread alignment code overflowed allocated storage"); | |
159 if (TraceBiasedLocking) { | |
160 if (aligned_addr != real_malloc_addr) | |
161 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
162 real_malloc_addr, aligned_addr); | |
163 } | |
164 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
165 return aligned_addr; | |
166 } else { | |
6197 | 167 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
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168 : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL); |
0 | 169 } |
170 } | |
171 | |
172 void Thread::operator delete(void* p) { | |
173 if (UseBiasedLocking) { | |
174 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
6197 | 175 FreeHeap(real_malloc_addr, mtThread); |
0 | 176 } else { |
6197 | 177 FreeHeap(p, mtThread); |
0 | 178 } |
179 } | |
180 | |
181 | |
182 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
183 // JavaThread | |
184 | |
185 | |
186 Thread::Thread() { | |
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187 // stack and get_thread |
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188 set_stack_base(NULL); |
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189 set_stack_size(0); |
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190 set_self_raw_id(0); |
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191 set_lgrp_id(-1); |
0 | 192 |
193 // allocated data structures | |
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194 set_osthread(NULL); |
6197 | 195 set_resource_area(new (mtThread)ResourceArea()); |
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196 DEBUG_ONLY(_current_resource_mark = NULL;) |
6197 | 197 set_handle_area(new (mtThread) HandleArea(NULL)); |
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198 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(30, true)); |
0 | 199 set_active_handles(NULL); |
200 set_free_handle_block(NULL); | |
201 set_last_handle_mark(NULL); | |
202 | |
203 // This initial value ==> never claimed. | |
204 _oops_do_parity = 0; | |
205 | |
206 // the handle mark links itself to last_handle_mark | |
10135 | 207 new HandleMark(this); |
208 | |
0 | 209 // plain initialization |
210 debug_only(_owned_locks = NULL;) | |
211 debug_only(_allow_allocation_count = 0;) | |
212 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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213 NOT_PRODUCT(_skip_gcalot = false;) |
0 | 214 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
215 _jvmti_env_iteration_count = 0; | |
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216 set_allocated_bytes(0); |
0 | 217 _vm_operation_started_count = 0; |
218 _vm_operation_completed_count = 0; | |
219 _current_pending_monitor = NULL; | |
220 _current_pending_monitor_is_from_java = true; | |
221 _current_waiting_monitor = NULL; | |
222 _num_nested_signal = 0; | |
223 omFreeList = NULL ; | |
224 omFreeCount = 0 ; | |
225 omFreeProvision = 32 ; | |
1587 | 226 omInUseList = NULL ; |
227 omInUseCount = 0 ; | |
0 | 228 |
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229 #ifdef ASSERT |
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230 _visited_for_critical_count = false; |
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231 #endif |
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232 |
0 | 233 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
234 _suspend_flags = 0; | |
235 | |
236 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
237 _hashStateX = os::random() ; | |
238 _hashStateY = 842502087 ; | |
239 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
240 _hashStateW = 273326509 ; | |
241 | |
242 _OnTrap = 0 ; | |
243 _schedctl = NULL ; | |
244 _Stalled = 0 ; | |
245 _TypeTag = 0x2BAD ; | |
246 | |
247 // Many of the following fields are effectively final - immutable | |
248 // Note that nascent threads can't use the Native Monitor-Mutex | |
249 // construct until the _MutexEvent is initialized ... | |
250 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
251 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
252 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
253 // and ::Release() | |
254 _ParkEvent = ParkEvent::Allocate (this) ; | |
255 _SleepEvent = ParkEvent::Allocate (this) ; | |
256 _MutexEvent = ParkEvent::Allocate (this) ; | |
257 _MuxEvent = ParkEvent::Allocate (this) ; | |
258 | |
259 #ifdef CHECK_UNHANDLED_OOPS | |
260 if (CheckUnhandledOops) { | |
261 _unhandled_oops = new UnhandledOops(this); | |
262 } | |
263 #endif // CHECK_UNHANDLED_OOPS | |
264 #ifdef ASSERT | |
265 if (UseBiasedLocking) { | |
266 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
267 assert(this == _real_malloc_address || | |
268 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
269 "bug in forced alignment of thread objects"); | |
270 } | |
271 #endif /* ASSERT */ | |
272 } | |
273 | |
274 void Thread::initialize_thread_local_storage() { | |
275 // Note: Make sure this method only calls | |
276 // non-blocking operations. Otherwise, it might not work | |
277 // with the thread-startup/safepoint interaction. | |
278 | |
279 // During Java thread startup, safepoint code should allow this | |
280 // method to complete because it may need to allocate memory to | |
281 // store information for the new thread. | |
282 | |
283 // initialize structure dependent on thread local storage | |
284 ThreadLocalStorage::set_thread(this); | |
285 } | |
286 | |
287 void Thread::record_stack_base_and_size() { | |
288 set_stack_base(os::current_stack_base()); | |
289 set_stack_size(os::current_stack_size()); | |
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290 if (is_Java_thread()) { |
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291 ((JavaThread*) this)->set_stack_overflow_limit(); |
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292 } |
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293 // CR 7190089: on Solaris, primordial thread's stack is adjusted |
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294 // in initialize_thread(). Without the adjustment, stack size is |
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295 // incorrect if stack is set to unlimited (ulimit -s unlimited). |
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296 // So far, only Solaris has real implementation of initialize_thread(). |
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297 // |
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298 // set up any platform-specific state. |
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299 os::initialize_thread(this); |
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300 |
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301 #if INCLUDE_NMT |
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302 // record thread's native stack, stack grows downward |
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303 address stack_low_addr = stack_base() - stack_size(); |
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304 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, |
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305 CURRENT_PC); |
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306 #endif // INCLUDE_NMT |
0 | 307 } |
308 | |
309 | |
310 Thread::~Thread() { | |
311 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
312 ObjectSynchronizer::omFlush (this) ; | |
313 | |
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314 EVENT_THREAD_DESTRUCT(this); |
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315 |
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316 // stack_base can be NULL if the thread is never started or exited before |
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317 // record_stack_base_and_size called. Although, we would like to ensure |
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318 // that all started threads do call record_stack_base_and_size(), there is |
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319 // not proper way to enforce that. |
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320 #if INCLUDE_NMT |
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321 if (_stack_base != NULL) { |
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322 address low_stack_addr = stack_base() - stack_size(); |
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323 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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324 #ifdef ASSERT |
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325 set_stack_base(NULL); |
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326 #endif |
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327 } |
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328 #endif // INCLUDE_NMT |
6197 | 329 |
0 | 330 // deallocate data structures |
331 delete resource_area(); | |
332 // since the handle marks are using the handle area, we have to deallocated the root | |
333 // handle mark before deallocating the thread's handle area, | |
334 assert(last_handle_mark() != NULL, "check we have an element"); | |
10135 | 335 delete last_handle_mark(); |
336 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
0 | 337 |
338 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
339 // We NULL out the fields for good hygiene. | |
340 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
341 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
342 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
343 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
344 | |
345 delete handle_area(); | |
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346 delete metadata_handles(); |
0 | 347 |
348 // osthread() can be NULL, if creation of thread failed. | |
349 if (osthread() != NULL) os::free_thread(osthread()); | |
350 | |
351 delete _SR_lock; | |
352 | |
353 // clear thread local storage if the Thread is deleting itself | |
354 if (this == Thread::current()) { | |
355 ThreadLocalStorage::set_thread(NULL); | |
356 } else { | |
357 // In the case where we're not the current thread, invalidate all the | |
358 // caches in case some code tries to get the current thread or the | |
359 // thread that was destroyed, and gets stale information. | |
360 ThreadLocalStorage::invalidate_all(); | |
361 } | |
362 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
363 } | |
364 | |
365 // NOTE: dummy function for assertion purpose. | |
366 void Thread::run() { | |
367 ShouldNotReachHere(); | |
368 } | |
369 | |
370 #ifdef ASSERT | |
371 // Private method to check for dangling thread pointer | |
372 void check_for_dangling_thread_pointer(Thread *thread) { | |
373 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
374 "possibility of dangling Thread pointer"); | |
375 } | |
376 #endif | |
377 | |
378 | |
379 #ifndef PRODUCT | |
380 // Tracing method for basic thread operations | |
381 void Thread::trace(const char* msg, const Thread* const thread) { | |
382 if (!TraceThreadEvents) return; | |
383 ResourceMark rm; | |
384 ThreadCritical tc; | |
385 const char *name = "non-Java thread"; | |
386 int prio = -1; | |
387 if (thread->is_Java_thread() | |
388 && !thread->is_Compiler_thread()) { | |
389 // The Threads_lock must be held to get information about | |
390 // this thread but may not be in some situations when | |
391 // tracing thread events. | |
392 bool release_Threads_lock = false; | |
393 if (!Threads_lock->owned_by_self()) { | |
394 Threads_lock->lock(); | |
395 release_Threads_lock = true; | |
396 } | |
397 JavaThread* jt = (JavaThread *)thread; | |
398 name = (char *)jt->get_thread_name(); | |
399 oop thread_oop = jt->threadObj(); | |
400 if (thread_oop != NULL) { | |
401 prio = java_lang_Thread::priority(thread_oop); | |
402 } | |
403 if (release_Threads_lock) { | |
404 Threads_lock->unlock(); | |
405 } | |
406 } | |
407 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
408 } | |
409 #endif | |
410 | |
411 | |
412 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
413 trace("get priority", thread); | |
414 ThreadPriority priority; | |
415 // Can return an error! | |
416 (void)os::get_priority(thread, priority); | |
417 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
418 return priority; | |
419 } | |
420 | |
421 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
422 trace("set priority", thread); | |
423 debug_only(check_for_dangling_thread_pointer(thread);) | |
424 // Can return an error! | |
425 (void)os::set_priority(thread, priority); | |
426 } | |
427 | |
428 | |
429 void Thread::start(Thread* thread) { | |
430 trace("start", thread); | |
431 // Start is different from resume in that its safety is guaranteed by context or | |
432 // being called from a Java method synchronized on the Thread object. | |
433 if (!DisableStartThread) { | |
434 if (thread->is_Java_thread()) { | |
435 // Initialize the thread state to RUNNABLE before starting this thread. | |
436 // Can not set it after the thread started because we do not know the | |
437 // exact thread state at that time. It could be in MONITOR_WAIT or | |
438 // in SLEEPING or some other state. | |
439 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
440 java_lang_Thread::RUNNABLE); | |
441 } | |
442 os::start_thread(thread); | |
443 } | |
444 } | |
445 | |
446 // Enqueue a VM_Operation to do the job for us - sometime later | |
447 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
448 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
449 VMThread::execute(vm_stop); | |
450 } | |
451 | |
452 | |
453 // | |
454 // Check if an external suspend request has completed (or has been | |
455 // cancelled). Returns true if the thread is externally suspended and | |
456 // false otherwise. | |
457 // | |
458 // The bits parameter returns information about the code path through | |
459 // the routine. Useful for debugging: | |
460 // | |
461 // set in is_ext_suspend_completed(): | |
462 // 0x00000001 - routine was entered | |
463 // 0x00000010 - routine return false at end | |
464 // 0x00000100 - thread exited (return false) | |
465 // 0x00000200 - suspend request cancelled (return false) | |
466 // 0x00000400 - thread suspended (return true) | |
467 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
468 // 0x00002000 - thread is native and walkable (return true) | |
469 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
470 // | |
471 // set in wait_for_ext_suspend_completion(): | |
472 // 0x00010000 - routine was entered | |
473 // 0x00020000 - suspend request cancelled before loop (return false) | |
474 // 0x00040000 - thread suspended before loop (return true) | |
475 // 0x00080000 - suspend request cancelled in loop (return false) | |
476 // 0x00100000 - thread suspended in loop (return true) | |
477 // 0x00200000 - suspend not completed during retry loop (return false) | |
478 // | |
479 | |
480 // Helper class for tracing suspend wait debug bits. | |
481 // | |
482 // 0x00000100 indicates that the target thread exited before it could | |
483 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
484 // 0x00080000 each indicate a cancelled suspend request so they don't | |
485 // count as wait failures either. | |
486 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
487 | |
488 class TraceSuspendDebugBits : public StackObj { | |
489 private: | |
490 JavaThread * jt; | |
491 bool is_wait; | |
492 bool called_by_wait; // meaningful when !is_wait | |
493 uint32_t * bits; | |
494 | |
495 public: | |
496 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
497 uint32_t *_bits) { | |
498 jt = _jt; | |
499 is_wait = _is_wait; | |
500 called_by_wait = _called_by_wait; | |
501 bits = _bits; | |
502 } | |
503 | |
504 ~TraceSuspendDebugBits() { | |
505 if (!is_wait) { | |
506 #if 1 | |
507 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
508 // That trace is very chatty. | |
509 return; | |
510 #else | |
511 if (!called_by_wait) { | |
512 // If tracing for is_ext_suspend_completed() is enabled, then only | |
513 // trace calls to it from wait_for_ext_suspend_completion() | |
514 return; | |
515 } | |
516 #endif | |
517 } | |
518 | |
519 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
520 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
521 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
522 ResourceMark rm; | |
523 | |
524 tty->print_cr( | |
525 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
526 jt->get_thread_name(), *bits); | |
527 | |
528 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
529 } | |
530 } | |
531 } | |
532 }; | |
533 #undef DEBUG_FALSE_BITS | |
534 | |
535 | |
536 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
537 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
538 | |
539 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
540 bool do_trans_retry; // flag to force the retry | |
541 | |
542 *bits |= 0x00000001; | |
543 | |
544 do { | |
545 do_trans_retry = false; | |
546 | |
547 if (is_exiting()) { | |
548 // Thread is in the process of exiting. This is always checked | |
549 // first to reduce the risk of dereferencing a freed JavaThread. | |
550 *bits |= 0x00000100; | |
551 return false; | |
552 } | |
553 | |
554 if (!is_external_suspend()) { | |
555 // Suspend request is cancelled. This is always checked before | |
556 // is_ext_suspended() to reduce the risk of a rogue resume | |
557 // confusing the thread that made the suspend request. | |
558 *bits |= 0x00000200; | |
559 return false; | |
560 } | |
561 | |
562 if (is_ext_suspended()) { | |
563 // thread is suspended | |
564 *bits |= 0x00000400; | |
565 return true; | |
566 } | |
567 | |
568 // Now that we no longer do hard suspends of threads running | |
569 // native code, the target thread can be changing thread state | |
570 // while we are in this routine: | |
571 // | |
572 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
573 // | |
574 // We save a copy of the thread state as observed at this moment | |
575 // and make our decision about suspend completeness based on the | |
576 // copy. This closes the race where the thread state is seen as | |
577 // _thread_in_native_trans in the if-thread_blocked check, but is | |
578 // seen as _thread_blocked in if-thread_in_native_trans check. | |
579 JavaThreadState save_state = thread_state(); | |
580 | |
581 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
582 // If the thread's state is _thread_blocked and this blocking | |
583 // condition is known to be equivalent to a suspend, then we can | |
584 // consider the thread to be externally suspended. This means that | |
585 // the code that sets _thread_blocked has been modified to do | |
586 // self-suspension if the blocking condition releases. We also | |
587 // used to check for CONDVAR_WAIT here, but that is now covered by | |
588 // the _thread_blocked with self-suspension check. | |
589 // | |
590 // Return true since we wouldn't be here unless there was still an | |
591 // external suspend request. | |
592 *bits |= 0x00001000; | |
593 return true; | |
594 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
595 // Threads running native code will self-suspend on native==>VM/Java | |
596 // transitions. If its stack is walkable (should always be the case | |
597 // unless this function is called before the actual java_suspend() | |
598 // call), then the wait is done. | |
599 *bits |= 0x00002000; | |
600 return true; | |
601 } else if (!called_by_wait && !did_trans_retry && | |
602 save_state == _thread_in_native_trans && | |
603 frame_anchor()->walkable()) { | |
604 // The thread is transitioning from thread_in_native to another | |
605 // thread state. check_safepoint_and_suspend_for_native_trans() | |
606 // will force the thread to self-suspend. If it hasn't gotten | |
607 // there yet we may have caught the thread in-between the native | |
608 // code check above and the self-suspend. Lucky us. If we were | |
609 // called by wait_for_ext_suspend_completion(), then it | |
610 // will be doing the retries so we don't have to. | |
611 // | |
612 // Since we use the saved thread state in the if-statement above, | |
613 // there is a chance that the thread has already transitioned to | |
614 // _thread_blocked by the time we get here. In that case, we will | |
615 // make a single unnecessary pass through the logic below. This | |
616 // doesn't hurt anything since we still do the trans retry. | |
617 | |
618 *bits |= 0x00004000; | |
619 | |
620 // Once the thread leaves thread_in_native_trans for another | |
621 // thread state, we break out of this retry loop. We shouldn't | |
622 // need this flag to prevent us from getting back here, but | |
623 // sometimes paranoia is good. | |
624 did_trans_retry = true; | |
625 | |
626 // We wait for the thread to transition to a more usable state. | |
627 for (int i = 1; i <= SuspendRetryCount; i++) { | |
628 // We used to do an "os::yield_all(i)" call here with the intention | |
629 // that yielding would increase on each retry. However, the parameter | |
630 // is ignored on Linux which means the yield didn't scale up. Waiting | |
631 // on the SR_lock below provides a much more predictable scale up for | |
632 // the delay. It also provides a simple/direct point to check for any | |
633 // safepoint requests from the VMThread | |
634 | |
635 // temporarily drops SR_lock while doing wait with safepoint check | |
636 // (if we're a JavaThread - the WatcherThread can also call this) | |
637 // and increase delay with each retry | |
638 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
639 | |
640 // check the actual thread state instead of what we saved above | |
641 if (thread_state() != _thread_in_native_trans) { | |
642 // the thread has transitioned to another thread state so | |
643 // try all the checks (except this one) one more time. | |
644 do_trans_retry = true; | |
645 break; | |
646 } | |
647 } // end retry loop | |
648 | |
649 | |
650 } | |
651 } while (do_trans_retry); | |
652 | |
653 *bits |= 0x00000010; | |
654 return false; | |
655 } | |
656 | |
657 // | |
658 // Wait for an external suspend request to complete (or be cancelled). | |
659 // Returns true if the thread is externally suspended and false otherwise. | |
660 // | |
661 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
662 uint32_t *bits) { | |
663 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
664 false /* !called_by_wait */, bits); | |
665 | |
666 // local flag copies to minimize SR_lock hold time | |
667 bool is_suspended; | |
668 bool pending; | |
669 uint32_t reset_bits; | |
670 | |
671 // set a marker so is_ext_suspend_completed() knows we are the caller | |
672 *bits |= 0x00010000; | |
673 | |
674 // We use reset_bits to reinitialize the bits value at the top of | |
675 // each retry loop. This allows the caller to make use of any | |
676 // unused bits for their own marking purposes. | |
677 reset_bits = *bits; | |
678 | |
679 { | |
680 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
681 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
682 delay, bits); | |
683 pending = is_external_suspend(); | |
684 } | |
685 // must release SR_lock to allow suspension to complete | |
686 | |
687 if (!pending) { | |
688 // A cancelled suspend request is the only false return from | |
689 // is_ext_suspend_completed() that keeps us from entering the | |
690 // retry loop. | |
691 *bits |= 0x00020000; | |
692 return false; | |
693 } | |
694 | |
695 if (is_suspended) { | |
696 *bits |= 0x00040000; | |
697 return true; | |
698 } | |
699 | |
700 for (int i = 1; i <= retries; i++) { | |
701 *bits = reset_bits; // reinit to only track last retry | |
702 | |
703 // We used to do an "os::yield_all(i)" call here with the intention | |
704 // that yielding would increase on each retry. However, the parameter | |
705 // is ignored on Linux which means the yield didn't scale up. Waiting | |
706 // on the SR_lock below provides a much more predictable scale up for | |
707 // the delay. It also provides a simple/direct point to check for any | |
708 // safepoint requests from the VMThread | |
709 | |
710 { | |
711 MutexLocker ml(SR_lock()); | |
712 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
713 // can also call this) and increase delay with each retry | |
714 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
715 | |
716 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
717 delay, bits); | |
718 | |
719 // It is possible for the external suspend request to be cancelled | |
720 // (by a resume) before the actual suspend operation is completed. | |
721 // Refresh our local copy to see if we still need to wait. | |
722 pending = is_external_suspend(); | |
723 } | |
724 | |
725 if (!pending) { | |
726 // A cancelled suspend request is the only false return from | |
727 // is_ext_suspend_completed() that keeps us from staying in the | |
728 // retry loop. | |
729 *bits |= 0x00080000; | |
730 return false; | |
731 } | |
732 | |
733 if (is_suspended) { | |
734 *bits |= 0x00100000; | |
735 return true; | |
736 } | |
737 } // end retry loop | |
738 | |
739 // thread did not suspend after all our retries | |
740 *bits |= 0x00200000; | |
741 return false; | |
742 } | |
743 | |
744 #ifndef PRODUCT | |
745 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
746 | |
747 // This should not need to be atomic as the only way for simultaneous | |
14309 | 748 // updates is via interrupts. Even then this should be rare or non-existent |
0 | 749 // and we don't care that much anyway. |
750 | |
751 int index = _jmp_ring_index; | |
752 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
753 _jmp_ring[index]._target = (intptr_t) target; | |
754 _jmp_ring[index]._instruction = (intptr_t) instr; | |
755 _jmp_ring[index]._file = file; | |
756 _jmp_ring[index]._line = line; | |
757 } | |
758 #endif /* PRODUCT */ | |
759 | |
760 // Called by flat profiler | |
761 // Callers have already called wait_for_ext_suspend_completion | |
762 // The assertion for that is currently too complex to put here: | |
763 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
764 bool gotframe = false; | |
765 // self suspension saves needed state. | |
766 if (has_last_Java_frame() && _anchor.walkable()) { | |
767 *_fr = pd_last_frame(); | |
768 gotframe = true; | |
769 } | |
770 return gotframe; | |
771 } | |
772 | |
773 void Thread::interrupt(Thread* thread) { | |
774 trace("interrupt", thread); | |
775 debug_only(check_for_dangling_thread_pointer(thread);) | |
776 os::interrupt(thread); | |
777 } | |
778 | |
779 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
780 trace("is_interrupted", thread); | |
781 debug_only(check_for_dangling_thread_pointer(thread);) | |
782 // Note: If clear_interrupted==false, this simply fetches and | |
783 // returns the value of the field osthread()->interrupted(). | |
784 return os::is_interrupted(thread, clear_interrupted); | |
785 } | |
786 | |
787 | |
788 // GC Support | |
789 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
790 jint thread_parity = _oops_do_parity; | |
791 if (thread_parity != strong_roots_parity) { | |
792 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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793 if (res == thread_parity) { |
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794 return true; |
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795 } else { |
0 | 796 guarantee(res == strong_roots_parity, "Or else what?"); |
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797 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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798 "Should only fail when parallel."); |
0 | 799 return false; |
800 } | |
801 } | |
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802 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
0 | 803 "Should only fail when parallel."); |
804 return false; | |
805 } | |
806 | |
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807 void Thread::oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf) { |
0 | 808 active_handles()->oops_do(f); |
809 // Do oop for ThreadShadow | |
810 f->do_oop((oop*)&_pending_exception); | |
811 handle_area()->oops_do(f); | |
812 } | |
813 | |
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814 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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815 // no nmethods in a generic thread... |
0 | 816 } |
817 | |
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818 void Thread::metadata_do(void f(Metadata*)) { |
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819 if (metadata_handles() != NULL) { |
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820 for (int i = 0; i< metadata_handles()->length(); i++) { |
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821 f(metadata_handles()->at(i)); |
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822 } |
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823 } |
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824 } |
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825 |
0 | 826 void Thread::print_on(outputStream* st) const { |
827 // get_priority assumes osthread initialized | |
828 if (osthread() != NULL) { | |
6766 | 829 int os_prio; |
830 if (os::get_native_priority(this, &os_prio) == OS_OK) { | |
831 st->print("os_prio=%d ", os_prio); | |
832 } | |
833 st->print("tid=" INTPTR_FORMAT " ", this); | |
0 | 834 osthread()->print_on(st); |
835 } | |
836 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
837 } | |
838 | |
839 // Thread::print_on_error() is called by fatal error handler. Don't use | |
840 // any lock or allocate memory. | |
841 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
842 if (is_VM_thread()) st->print("VMThread"); | |
843 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
844 else if (is_Java_thread()) st->print("JavaThread"); | |
845 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
846 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
847 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
848 else st->print("Thread"); | |
849 | |
850 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
851 _stack_base - _stack_size, _stack_base); | |
852 | |
853 if (osthread()) { | |
854 st->print(" [id=%d]", osthread()->thread_id()); | |
855 } | |
856 } | |
857 | |
858 #ifdef ASSERT | |
859 void Thread::print_owned_locks_on(outputStream* st) const { | |
860 Monitor *cur = _owned_locks; | |
861 if (cur == NULL) { | |
862 st->print(" (no locks) "); | |
863 } else { | |
864 st->print_cr(" Locks owned:"); | |
865 while(cur) { | |
866 cur->print_on(st); | |
867 cur = cur->next(); | |
868 } | |
869 } | |
870 } | |
871 | |
872 static int ref_use_count = 0; | |
873 | |
874 bool Thread::owns_locks_but_compiled_lock() const { | |
875 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
876 if (cur != Compile_lock) return true; | |
877 } | |
878 return false; | |
879 } | |
880 | |
881 | |
882 #endif | |
883 | |
884 #ifndef PRODUCT | |
885 | |
886 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
887 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
888 // no threads which allow_vm_block's are held | |
889 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
890 // Check if current thread is allowed to block at a safepoint | |
891 if (!(_allow_safepoint_count == 0)) | |
892 fatal("Possible safepoint reached by thread that does not allow it"); | |
893 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
894 fatal("LEAF method calling lock?"); | |
895 } | |
896 | |
897 #ifdef ASSERT | |
898 if (potential_vm_operation && is_Java_thread() | |
899 && !Universe::is_bootstrapping()) { | |
900 // Make sure we do not hold any locks that the VM thread also uses. | |
901 // This could potentially lead to deadlocks | |
902 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
903 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
904 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
905 // since it is used to transfer control between JavaThreads and the VMThread | |
14309 | 906 // Do not *exclude* any locks unless you are absolutely sure it is correct. Ask someone else first! |
0 | 907 if ( (cur->allow_vm_block() && |
908 cur != Threads_lock && | |
14309 | 909 cur != Compile_lock && // Temporary: should not be necessary when we get separate compilation |
0 | 910 cur != VMOperationRequest_lock && |
911 cur != VMOperationQueue_lock) || | |
912 cur->rank() == Mutex::special) { | |
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913 fatal(err_msg("Thread holding lock at safepoint that vm can block on: %s", cur->name())); |
0 | 914 } |
915 } | |
916 } | |
917 | |
918 if (GCALotAtAllSafepoints) { | |
919 // We could enter a safepoint here and thus have a gc | |
920 InterfaceSupport::check_gc_alot(); | |
921 } | |
922 #endif | |
923 } | |
924 #endif | |
925 | |
926 bool Thread::is_in_stack(address adr) const { | |
927 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
928 address end = os::current_stack_pointer(); | |
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929 // Allow non Java threads to call this without stack_base |
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930 if (_stack_base == NULL) return true; |
0 | 931 if (stack_base() >= adr && adr >= end) return true; |
932 | |
933 return false; | |
934 } | |
935 | |
936 | |
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937 bool Thread::is_in_usable_stack(address adr) const { |
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938 size_t stack_guard_size = os::uses_stack_guard_pages() ? (StackYellowPages + StackRedPages) * os::vm_page_size() : 0; |
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939 size_t usable_stack_size = _stack_size - stack_guard_size; |
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940 |
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941 return ((adr < stack_base()) && (adr >= stack_base() - usable_stack_size)); |
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942 } |
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943 |
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944 |
0 | 945 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter |
946 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
947 // used for compilation in the future. If that change is made, the need for these methods | |
948 // should be revisited, and they should be removed if possible. | |
949 | |
950 bool Thread::is_lock_owned(address adr) const { | |
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951 return on_local_stack(adr); |
0 | 952 } |
953 | |
954 bool Thread::set_as_starting_thread() { | |
955 // NOTE: this must be called inside the main thread. | |
956 return os::create_main_thread((JavaThread*)this); | |
957 } | |
958 | |
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959 static void initialize_class(Symbol* class_name, TRAPS) { |
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960 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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961 InstanceKlass::cast(klass)->initialize(CHECK); |
0 | 962 } |
963 | |
964 | |
965 // Creates the initial ThreadGroup | |
966 static Handle create_initial_thread_group(TRAPS) { | |
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967 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
0 | 968 instanceKlassHandle klass (THREAD, k); |
969 | |
970 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
971 { | |
972 JavaValue result(T_VOID); | |
973 JavaCalls::call_special(&result, | |
974 system_instance, | |
975 klass, | |
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976 vmSymbols::object_initializer_name(), |
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977 vmSymbols::void_method_signature(), |
0 | 978 CHECK_NH); |
979 } | |
980 Universe::set_system_thread_group(system_instance()); | |
981 | |
982 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
983 { | |
984 JavaValue result(T_VOID); | |
985 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
986 JavaCalls::call_special(&result, | |
987 main_instance, | |
988 klass, | |
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989 vmSymbols::object_initializer_name(), |
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990 vmSymbols::threadgroup_string_void_signature(), |
0 | 991 system_instance, |
992 string, | |
993 CHECK_NH); | |
994 } | |
995 return main_instance; | |
996 } | |
997 | |
998 // Creates the initial Thread | |
999 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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1000 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
0 | 1001 instanceKlassHandle klass (THREAD, k); |
1002 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
1003 | |
1004 java_lang_Thread::set_thread(thread_oop(), thread); | |
1005 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1006 thread->set_threadObj(thread_oop()); | |
1007 | |
1008 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
1009 | |
1010 JavaValue result(T_VOID); | |
1011 JavaCalls::call_special(&result, thread_oop, | |
1012 klass, | |
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1013 vmSymbols::object_initializer_name(), |
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1014 vmSymbols::threadgroup_string_void_signature(), |
0 | 1015 thread_group, |
1016 string, | |
1017 CHECK_NULL); | |
1018 return thread_oop(); | |
1019 } | |
1020 | |
1021 static void call_initializeSystemClass(TRAPS) { | |
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1022 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1023 instanceKlassHandle klass (THREAD, k); |
1024 | |
1025 JavaValue result(T_VOID); | |
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1026 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1027 vmSymbols::void_method_signature(), CHECK); |
0 | 1028 } |
1029 | |
6181 | 1030 char java_runtime_name[128] = ""; |
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1031 char java_runtime_version[128] = ""; |
6181 | 1032 |
1033 // extract the JRE name from sun.misc.Version.java_runtime_name | |
1034 static const char* get_java_runtime_name(TRAPS) { | |
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1035 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
6181 | 1036 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
1037 fieldDescriptor fd; | |
1038 bool found = k != NULL && | |
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1039 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
6181 | 1040 vmSymbols::string_signature(), &fd); |
1041 if (found) { | |
1042 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
1043 if (name_oop == NULL) | |
1044 return NULL; | |
1045 const char* name = java_lang_String::as_utf8_string(name_oop, | |
1046 java_runtime_name, | |
1047 sizeof(java_runtime_name)); | |
1048 return name; | |
1049 } else { | |
1050 return NULL; | |
1051 } | |
1052 } | |
1053 | |
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1054 // extract the JRE version from sun.misc.Version.java_runtime_version |
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1055 static const char* get_java_runtime_version(TRAPS) { |
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1056 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
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1057 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
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1058 fieldDescriptor fd; |
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1059 bool found = k != NULL && |
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1060 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_version_name(), |
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1061 vmSymbols::string_signature(), &fd); |
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1062 if (found) { |
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1063 oop name_oop = k->java_mirror()->obj_field(fd.offset()); |
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1064 if (name_oop == NULL) |
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1065 return NULL; |
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1066 const char* name = java_lang_String::as_utf8_string(name_oop, |
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1067 java_runtime_version, |
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1068 sizeof(java_runtime_version)); |
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1069 return name; |
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1070 } else { |
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1071 return NULL; |
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1072 } |
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1073 } |
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1074 |
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1075 // General purpose hook into Java code, run once when the VM is initialized. |
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1076 // The Java library method itself may be changed independently from the VM. |
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1077 static void call_postVMInitHook(TRAPS) { |
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1078 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::sun_misc_PostVMInitHook(), THREAD); |
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1079 instanceKlassHandle klass (THREAD, k); |
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1080 if (klass.not_null()) { |
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1081 JavaValue result(T_VOID); |
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1082 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1083 vmSymbols::void_method_signature(), |
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1084 CHECK); |
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1085 } |
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1086 } |
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1087 |
0 | 1088 static void reset_vm_info_property(TRAPS) { |
1089 // the vm info string | |
1090 ResourceMark rm(THREAD); | |
1091 const char *vm_info = VM_Version::vm_info_string(); | |
1092 | |
1093 // java.lang.System class | |
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1094 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1095 instanceKlassHandle klass (THREAD, k); |
1096 | |
1097 // setProperty arguments | |
1098 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
1099 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
1100 | |
1101 // return value | |
1102 JavaValue r(T_OBJECT); | |
1103 | |
1104 // public static String setProperty(String key, String value); | |
1105 JavaCalls::call_static(&r, | |
1106 klass, | |
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1107 vmSymbols::setProperty_name(), |
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1108 vmSymbols::string_string_string_signature(), |
0 | 1109 key_str, |
1110 value_str, | |
1111 CHECK); | |
1112 } | |
1113 | |
1114 | |
1115 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
1116 assert(thread_group.not_null(), "thread group should be specified"); | |
1117 assert(threadObj() == NULL, "should only create Java thread object once"); | |
1118 | |
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1119 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 1120 instanceKlassHandle klass (THREAD, k); |
1121 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
1122 | |
1123 java_lang_Thread::set_thread(thread_oop(), this); | |
1124 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1125 set_threadObj(thread_oop()); | |
1126 | |
1127 JavaValue result(T_VOID); | |
1128 if (thread_name != NULL) { | |
1129 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
1130 // Thread gets assigned specified name and null target | |
1131 JavaCalls::call_special(&result, | |
1132 thread_oop, | |
1133 klass, | |
2177
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1134 vmSymbols::object_initializer_name(), |
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1135 vmSymbols::threadgroup_string_void_signature(), |
0 | 1136 thread_group, // Argument 1 |
1137 name, // Argument 2 | |
1138 THREAD); | |
1139 } else { | |
1140 // Thread gets assigned name "Thread-nnn" and null target | |
1141 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
1142 JavaCalls::call_special(&result, | |
1143 thread_oop, | |
1144 klass, | |
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1145 vmSymbols::object_initializer_name(), |
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1146 vmSymbols::threadgroup_runnable_void_signature(), |
0 | 1147 thread_group, // Argument 1 |
1148 Handle(), // Argument 2 | |
1149 THREAD); | |
1150 } | |
1151 | |
1152 | |
1153 if (daemon) { | |
1154 java_lang_Thread::set_daemon(thread_oop()); | |
1155 } | |
1156 | |
1157 if (HAS_PENDING_EXCEPTION) { | |
1158 return; | |
1159 } | |
1160 | |
1142 | 1161 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
0 | 1162 Handle threadObj(this, this->threadObj()); |
1163 | |
1164 JavaCalls::call_special(&result, | |
1165 thread_group, | |
1166 group, | |
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1167 vmSymbols::add_method_name(), |
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1168 vmSymbols::thread_void_signature(), |
0 | 1169 threadObj, // Arg 1 |
1170 THREAD); | |
1171 | |
1172 | |
1173 } | |
1174 | |
1175 // NamedThread -- non-JavaThread subclasses with multiple | |
1176 // uniquely named instances should derive from this. | |
1177 NamedThread::NamedThread() : Thread() { | |
1178 _name = NULL; | |
1119
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1179 _processed_thread = NULL; |
0 | 1180 } |
1181 | |
1182 NamedThread::~NamedThread() { | |
1183 if (_name != NULL) { | |
6197 | 1184 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
0 | 1185 _name = NULL; |
1186 } | |
1187 } | |
1188 | |
1189 void NamedThread::set_name(const char* format, ...) { | |
1190 guarantee(_name == NULL, "Only get to set name once."); | |
6197 | 1191 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
0 | 1192 guarantee(_name != NULL, "alloc failure"); |
1193 va_list ap; | |
1194 va_start(ap, format); | |
1195 jio_vsnprintf(_name, max_name_len, format, ap); | |
1196 va_end(ap); | |
1197 } | |
1198 | |
1199 // ======= WatcherThread ======== | |
1200 | |
1201 // The watcher thread exists to simulate timer interrupts. It should | |
1202 // be replaced by an abstraction over whatever native support for | |
1203 // timer interrupts exists on the platform. | |
1204 | |
1205 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
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1206 bool WatcherThread::_startable = false; |
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1207 volatile bool WatcherThread::_should_terminate = false; |
0 | 1208 |
11151 | 1209 WatcherThread::WatcherThread() : Thread(), _crash_protection(NULL) { |
0 | 1210 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); |
1211 if (os::create_thread(this, os::watcher_thread)) { | |
1212 _watcher_thread = this; | |
1213 | |
1214 // Set the watcher thread to the highest OS priority which should not be | |
1215 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1216 // is created. The only normal thread using this priority is the reference | |
1217 // handler thread, which runs for very short intervals only. | |
1218 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1219 // will be inaccurate. | |
1220 os::set_priority(this, MaxPriority); | |
1221 if (!DisableStartThread) { | |
1222 os::start_thread(this); | |
1223 } | |
1224 } | |
1225 } | |
1226 | |
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1227 int WatcherThread::sleep() const { |
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1228 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1229 |
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1230 // remaining will be zero if there are no tasks, |
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1231 // causing the WatcherThread to sleep until a task is |
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1232 // enrolled |
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1233 int remaining = PeriodicTask::time_to_wait(); |
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1234 int time_slept = 0; |
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1235 |
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1236 // we expect this to timeout - we only ever get unparked when |
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1237 // we should terminate or when a new task has been enrolled |
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1238 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1239 |
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1240 jlong time_before_loop = os::javaTimeNanos(); |
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1241 |
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1242 for (;;) { |
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1243 bool timedout = PeriodicTask_lock->wait(Mutex::_no_safepoint_check_flag, remaining); |
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1244 jlong now = os::javaTimeNanos(); |
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1245 |
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1246 if (remaining == 0) { |
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1247 // if we didn't have any tasks we could have waited for a long time |
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1248 // consider the time_slept zero and reset time_before_loop |
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1249 time_slept = 0; |
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1250 time_before_loop = now; |
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1251 } else { |
14309 | 1252 // need to recalculate since we might have new tasks in _tasks |
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1253 time_slept = (int) ((now - time_before_loop) / 1000000); |
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1254 } |
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1255 |
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1256 // Change to task list or spurious wakeup of some kind |
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1257 if (timedout || _should_terminate) { |
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1258 break; |
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1259 } |
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1260 |
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1261 remaining = PeriodicTask::time_to_wait(); |
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1262 if (remaining == 0) { |
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1263 // Last task was just disenrolled so loop around and wait until |
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1264 // another task gets enrolled |
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1265 continue; |
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1266 } |
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1267 |
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1268 remaining -= time_slept; |
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1269 if (remaining <= 0) |
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1270 break; |
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1271 } |
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1272 |
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1273 return time_slept; |
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1274 } |
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1275 |
0 | 1276 void WatcherThread::run() { |
1277 assert(this == watcher_thread(), "just checking"); | |
1278 | |
1279 this->record_stack_base_and_size(); | |
1280 this->initialize_thread_local_storage(); | |
1281 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1282 while(!_should_terminate) { | |
1283 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1284 assert(watcher_thread() == this, "thread consistency check"); | |
1285 | |
1286 // Calculate how long it'll be until the next PeriodicTask work | |
1287 // should be done, and sleep that amount of time. | |
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1288 int time_waited = sleep(); |
0 | 1289 |
1290 if (is_error_reported()) { | |
1291 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1292 // should abort JVM after creating an error log file. However in some | |
1293 // rare cases, the error handler itself might deadlock. Here we try to | |
1294 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1295 // | |
1296 // This code is in WatcherThread because WatcherThread wakes up | |
1297 // periodically so the fatal error handler doesn't need to do anything; | |
1298 // also because the WatcherThread is less likely to crash than other | |
1299 // threads. | |
1300 | |
1301 for (;;) { | |
1302 if (!ShowMessageBoxOnError | |
1303 && (OnError == NULL || OnError[0] == '\0') | |
1304 && Arguments::abort_hook() == NULL) { | |
1305 os::sleep(this, 2 * 60 * 1000, false); | |
1306 fdStream err(defaultStream::output_fd()); | |
1307 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1308 // skip atexit/vm_exit/vm_abort hooks | |
1309 os::die(); | |
1310 } | |
1311 | |
1312 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1313 // ShowMessageBoxOnError when it is ready to abort. | |
1314 os::sleep(this, 5 * 1000, false); | |
1315 } | |
1316 } | |
1317 | |
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1318 PeriodicTask::real_time_tick(time_waited); |
0 | 1319 } |
1320 | |
1321 // Signal that it is terminated | |
1322 { | |
1323 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1324 _watcher_thread = NULL; | |
1325 Terminator_lock->notify(); | |
1326 } | |
1327 | |
1328 // Thread destructor usually does this.. | |
1329 ThreadLocalStorage::set_thread(NULL); | |
1330 } | |
1331 | |
1332 void WatcherThread::start() { | |
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1333 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1334 |
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1335 if (watcher_thread() == NULL && _startable) { |
0 | 1336 _should_terminate = false; |
1337 // Create the single instance of WatcherThread | |
1338 new WatcherThread(); | |
1339 } | |
1340 } | |
1341 | |
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1342 void WatcherThread::make_startable() { |
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1343 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1344 _startable = true; |
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1345 } |
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1346 |
0 | 1347 void WatcherThread::stop() { |
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1348 { |
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1349 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1350 _should_terminate = true; |
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1351 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1352 |
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1353 WatcherThread* watcher = watcher_thread(); |
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1354 if (watcher != NULL) |
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1355 watcher->unpark(); |
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1356 } |
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1357 |
0 | 1358 // it is ok to take late safepoints here, if needed |
1359 MutexLocker mu(Terminator_lock); | |
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1360 |
0 | 1361 while(watcher_thread() != NULL) { |
1362 // This wait should make safepoint checks, wait without a timeout, | |
1363 // and wait as a suspend-equivalent condition. | |
1364 // | |
1365 // Note: If the FlatProfiler is running, then this thread is waiting | |
1366 // for the WatcherThread to terminate and the WatcherThread, via the | |
1367 // FlatProfiler task, is waiting for the external suspend request on | |
1368 // this thread to complete. wait_for_ext_suspend_completion() will | |
1369 // eventually timeout, but that takes time. Making this wait a | |
1370 // suspend-equivalent condition solves that timeout problem. | |
1371 // | |
1372 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1373 Mutex::_as_suspend_equivalent_flag); | |
1374 } | |
1375 } | |
1376 | |
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1377 void WatcherThread::unpark() { |
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1378 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1379 PeriodicTask_lock->notify(); |
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1380 } |
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1381 |
0 | 1382 void WatcherThread::print_on(outputStream* st) const { |
1383 st->print("\"%s\" ", name()); | |
1384 Thread::print_on(st); | |
1385 st->cr(); | |
1386 } | |
1387 | |
1388 // ======= JavaThread ======== | |
1389 | |
1390 // A JavaThread is a normal Java thread | |
1391 | |
1392 void JavaThread::initialize() { | |
1393 // Initialize fields | |
342
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1394 |
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1395 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1396 set_claimed_par_id(-1); |
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1397 |
0 | 1398 set_saved_exception_pc(NULL); |
1399 set_threadObj(NULL); | |
1400 _anchor.clear(); | |
1401 set_entry_point(NULL); | |
1402 set_jni_functions(jni_functions()); | |
1403 set_callee_target(NULL); | |
1404 set_vm_result(NULL); | |
1405 set_vm_result_2(NULL); | |
1406 set_vframe_array_head(NULL); | |
1407 set_vframe_array_last(NULL); | |
1408 set_deferred_locals(NULL); | |
1409 set_deopt_mark(NULL); | |
1814
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1410 set_deopt_nmethod(NULL); |
0 | 1411 clear_must_deopt_id(); |
1412 set_monitor_chunks(NULL); | |
1413 set_next(NULL); | |
1414 set_thread_state(_thread_new); | |
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1415 #if INCLUDE_NMT |
6197 | 1416 set_recorder(NULL); |
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1417 #endif |
0 | 1418 _terminated = _not_terminated; |
1419 _privileged_stack_top = NULL; | |
1420 _array_for_gc = NULL; | |
1421 _suspend_equivalent = false; | |
1422 _in_deopt_handler = 0; | |
1423 _doing_unsafe_access = false; | |
1424 _stack_guard_state = stack_guard_unused; | |
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1425 (void)const_cast<oop&>(_exception_oop = NULL); |
0 | 1426 _exception_pc = 0; |
1427 _exception_handler_pc = 0; | |
1903 | 1428 _is_method_handle_return = 0; |
0 | 1429 _jvmti_thread_state= NULL; |
1213
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1430 _should_post_on_exceptions_flag = JNI_FALSE; |
0 | 1431 _jvmti_get_loaded_classes_closure = NULL; |
1432 _interp_only_mode = 0; | |
1433 _special_runtime_exit_condition = _no_async_condition; | |
1434 _pending_async_exception = NULL; | |
1435 _thread_stat = NULL; | |
1436 _thread_stat = new ThreadStatistics(); | |
1437 _blocked_on_compilation = false; | |
1438 _jni_active_critical = 0; | |
1439 _do_not_unlock_if_synchronized = false; | |
1440 _cached_monitor_info = NULL; | |
1441 _parker = Parker::Allocate(this) ; | |
1442 | |
1443 #ifndef PRODUCT | |
1444 _jmp_ring_index = 0; | |
1445 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1446 record_jump(NULL, NULL, NULL, 0); | |
1447 } | |
1448 #endif /* PRODUCT */ | |
1449 | |
1450 set_thread_profiler(NULL); | |
1451 if (FlatProfiler::is_active()) { | |
1452 // This is where we would decide to either give each thread it's own profiler | |
1453 // or use one global one from FlatProfiler, | |
1454 // or up to some count of the number of profiled threads, etc. | |
1455 ThreadProfiler* pp = new ThreadProfiler(); | |
1456 pp->engage(); | |
1457 set_thread_profiler(pp); | |
1458 } | |
1459 | |
1460 // Setup safepoint state info for this thread | |
1461 ThreadSafepointState::create(this); | |
1462 | |
1463 debug_only(_java_call_counter = 0); | |
1464 | |
1465 // JVMTI PopFrame support | |
1466 _popframe_condition = popframe_inactive; | |
1467 _popframe_preserved_args = NULL; | |
1468 _popframe_preserved_args_size = 0; | |
1469 | |
1470 pd_initialize(); | |
1471 } | |
1472 | |
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1473 #if INCLUDE_ALL_GCS |
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1474 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1475 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1476 #endif // INCLUDE_ALL_GCS |
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1477 |
4006 | 1478 JavaThread::JavaThread(bool is_attaching_via_jni) : |
342
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1479 Thread() |
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1480 #if INCLUDE_ALL_GCS |
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1481 , _satb_mark_queue(&_satb_mark_queue_set), |
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1482 _dirty_card_queue(&_dirty_card_queue_set) |
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1483 #endif // INCLUDE_ALL_GCS |
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1484 { |
0 | 1485 initialize(); |
4006 | 1486 if (is_attaching_via_jni) { |
1487 _jni_attach_state = _attaching_via_jni; | |
1488 } else { | |
1489 _jni_attach_state = _not_attaching_via_jni; | |
1490 } | |
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1491 assert(deferred_card_mark().is_empty(), "Default MemRegion ctor"); |
6197 | 1492 _safepoint_visible = false; |
0 | 1493 } |
1494 | |
1495 bool JavaThread::reguard_stack(address cur_sp) { | |
1496 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1497 return true; // Stack already guarded or guard pages not needed. | |
1498 } | |
1499 | |
1500 if (register_stack_overflow()) { | |
1501 // For those architectures which have separate register and | |
1502 // memory stacks, we must check the register stack to see if | |
1503 // it has overflowed. | |
1504 return false; | |
1505 } | |
1506 | |
1507 // Java code never executes within the yellow zone: the latter is only | |
1508 // there to provoke an exception during stack banging. If java code | |
1509 // is executing there, either StackShadowPages should be larger, or | |
1510 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1511 // when it should. | |
1512 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1513 | |
1514 enable_stack_yellow_zone(); | |
1515 return true; | |
1516 } | |
1517 | |
1518 bool JavaThread::reguard_stack(void) { | |
1519 return reguard_stack(os::current_stack_pointer()); | |
1520 } | |
1521 | |
1522 | |
1523 void JavaThread::block_if_vm_exited() { | |
1524 if (_terminated == _vm_exited) { | |
1525 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1526 // we will block here forever | |
1527 Threads_lock->lock_without_safepoint_check(); | |
1528 ShouldNotReachHere(); | |
1529 } | |
1530 } | |
1531 | |
1532 | |
1533 // Remove this ifdef when C1 is ported to the compiler interface. | |
1534 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1535 | |
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1536 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1537 Thread() |
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1538 #if INCLUDE_ALL_GCS |
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1539 , _satb_mark_queue(&_satb_mark_queue_set), |
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1540 _dirty_card_queue(&_dirty_card_queue_set) |
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1541 #endif // INCLUDE_ALL_GCS |
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1542 { |
0 | 1543 if (TraceThreadEvents) { |
1544 tty->print_cr("creating thread %p", this); | |
1545 } | |
1546 initialize(); | |
4006 | 1547 _jni_attach_state = _not_attaching_via_jni; |
0 | 1548 set_entry_point(entry_point); |
1549 // Create the native thread itself. | |
1550 // %note runtime_23 | |
1551 os::ThreadType thr_type = os::java_thread; | |
1552 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1553 os::java_thread; | |
1554 os::create_thread(this, thr_type, stack_sz); | |
6197 | 1555 _safepoint_visible = false; |
0 | 1556 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
1557 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1558 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1559 // the exception consists of creating the exception object & initializing it, initialization | |
1560 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1561 // | |
1562 // The thread is still suspended when we reach here. Thread must be explicit started | |
1563 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1564 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1565 // object must be fully initialized (take a look at JVM_Start) | |
1566 } | |
1567 | |
1568 JavaThread::~JavaThread() { | |
1569 if (TraceThreadEvents) { | |
1570 tty->print_cr("terminate thread %p", this); | |
1571 } | |
1572 | |
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1573 // By now, this thread should already be invisible to safepoint, |
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1574 // and its per-thread recorder also collected. |
6197 | 1575 assert(!is_safepoint_visible(), "wrong state"); |
6882
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1576 #if INCLUDE_NMT |
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1577 assert(get_recorder() == NULL, "Already collected"); |
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1578 #endif // INCLUDE_NMT |
6197 | 1579 |
0 | 1580 // JSR166 -- return the parker to the free list |
1581 Parker::Release(_parker); | |
1582 _parker = NULL ; | |
1583 | |
1584 // Free any remaining previous UnrollBlock | |
1585 vframeArray* old_array = vframe_array_last(); | |
1586 | |
1587 if (old_array != NULL) { | |
1588 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1589 old_array->set_unroll_block(NULL); | |
1590 delete old_info; | |
1591 delete old_array; | |
1592 } | |
1593 | |
1594 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1595 if (deferred != NULL) { | |
1596 // This can only happen if thread is destroyed before deoptimization occurs. | |
1597 assert(deferred->length() != 0, "empty array!"); | |
1598 do { | |
1599 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1600 deferred->remove_at(0); | |
1601 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1602 delete dlv; | |
1603 } while (deferred->length() != 0); | |
1604 delete deferred; | |
1605 } | |
1606 | |
1607 // All Java related clean up happens in exit | |
1608 ThreadSafepointState::destroy(this); | |
1609 if (_thread_profiler != NULL) delete _thread_profiler; | |
1610 if (_thread_stat != NULL) delete _thread_stat; | |
1611 } | |
1612 | |
1613 | |
1614 // The first routine called by a new Java thread | |
1615 void JavaThread::run() { | |
1616 // initialize thread-local alloc buffer related fields | |
1617 this->initialize_tlab(); | |
1618 | |
14309 | 1619 // used to test validity of stack trace backs |
0 | 1620 this->record_base_of_stack_pointer(); |
1621 | |
1622 // Record real stack base and size. | |
1623 this->record_stack_base_and_size(); | |
1624 | |
1625 // Initialize thread local storage; set before calling MutexLocker | |
1626 this->initialize_thread_local_storage(); | |
1627 | |
1628 this->create_stack_guard_pages(); | |
1629 | |
1681
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1630 this->cache_global_variables(); |
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|
1631 |
0 | 1632 // Thread is now sufficient initialized to be handled by the safepoint code as being |
1633 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1634 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1635 | |
1636 assert(JavaThread::current() == this, "sanity check"); | |
1637 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1638 | |
1639 DTRACE_THREAD_PROBE(start, this); | |
1640 | |
1641 // This operation might block. We call that after all safepoint checks for a new thread has | |
1642 // been completed. | |
1643 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1644 | |
1645 if (JvmtiExport::should_post_thread_life()) { | |
1646 JvmtiExport::post_thread_start(this); | |
1647 } | |
1648 | |
10405 | 1649 EventThreadStart event; |
1650 if (event.should_commit()) { | |
1651 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj())); | |
1652 event.commit(); | |
1653 } | |
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1654 |
0 | 1655 // We call another function to do the rest so we are sure that the stack addresses used |
1656 // from there will be lower than the stack base just computed | |
1657 thread_main_inner(); | |
1658 | |
1659 // Note, thread is no longer valid at this point! | |
1660 } | |
1661 | |
1662 | |
1663 void JavaThread::thread_main_inner() { | |
1664 assert(JavaThread::current() == this, "sanity check"); | |
1665 assert(this->threadObj() != NULL, "just checking"); | |
1666 | |
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1667 // Execute thread entry point unless this thread has a pending exception |
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1668 // or has been stopped before starting. |
0 | 1669 // Note: Due to JVM_StopThread we can have pending exceptions already! |
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1670 if (!this->has_pending_exception() && |
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1671 !java_lang_Thread::is_stillborn(this->threadObj())) { |
4006 | 1672 { |
1673 ResourceMark rm(this); | |
1674 this->set_native_thread_name(this->get_thread_name()); | |
1675 } | |
0 | 1676 HandleMark hm(this); |
1677 this->entry_point()(this, this); | |
1678 } | |
1679 | |
1680 DTRACE_THREAD_PROBE(stop, this); | |
1681 | |
1682 this->exit(false); | |
1683 delete this; | |
1684 } | |
1685 | |
1686 | |
1687 static void ensure_join(JavaThread* thread) { | |
1688 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1689 Handle threadObj(thread, thread->threadObj()); | |
1690 assert(threadObj.not_null(), "java thread object must exist"); | |
1691 ObjectLocker lock(threadObj, thread); | |
1692 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1693 thread->clear_pending_exception(); | |
1694 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1695 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
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1696 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1697 // to complete once we've done the notify_all below |
0 | 1698 java_lang_Thread::set_thread(threadObj(), NULL); |
1699 lock.notify_all(thread); | |
1700 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1701 thread->clear_pending_exception(); | |
1702 } | |
1703 | |
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1704 |
0 | 1705 // For any new cleanup additions, please check to see if they need to be applied to |
1706 // cleanup_failed_attach_current_thread as well. | |
1707 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
1708 assert(this == JavaThread::current(), "thread consistency check"); | |
1709 | |
1710 HandleMark hm(this); | |
1711 Handle uncaught_exception(this, this->pending_exception()); | |
1712 this->clear_pending_exception(); | |
1713 Handle threadObj(this, this->threadObj()); | |
1714 assert(threadObj.not_null(), "Java thread object should be created"); | |
1715 | |
1716 if (get_thread_profiler() != NULL) { | |
1717 get_thread_profiler()->disengage(); | |
1718 ResourceMark rm; | |
1719 get_thread_profiler()->print(get_thread_name()); | |
1720 } | |
1721 | |
1722 | |
1723 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
1724 { | |
1725 EXCEPTION_MARK; | |
1726 | |
1727 CLEAR_PENDING_EXCEPTION; | |
1728 } | |
1729 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
1730 // has to be fixed by a runtime query method | |
1731 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
1732 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
1733 // java.lang.Thread.dispatchUncaughtException | |
1734 if (uncaught_exception.not_null()) { | |
1735 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
1736 { | |
1737 EXCEPTION_MARK; | |
1738 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
1739 // call it. Otherwise we have an older library without the JSR-166 changes, | |
1740 // so call ThreadGroup.uncaughtException() | |
1741 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
1742 CallInfo callinfo; | |
1142 | 1743 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1744 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
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1745 vmSymbols::dispatchUncaughtException_name(), |
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1746 vmSymbols::throwable_void_signature(), |
0 | 1747 KlassHandle(), false, false, THREAD); |
1748 CLEAR_PENDING_EXCEPTION; | |
1749 methodHandle method = callinfo.selected_method(); | |
1750 if (method.not_null()) { | |
1751 JavaValue result(T_VOID); | |
1752 JavaCalls::call_virtual(&result, | |
1753 threadObj, thread_klass, | |
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1754 vmSymbols::dispatchUncaughtException_name(), |
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1755 vmSymbols::throwable_void_signature(), |
0 | 1756 uncaught_exception, |
1757 THREAD); | |
1758 } else { | |
1142 | 1759 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 1760 JavaValue result(T_VOID); |
1761 JavaCalls::call_virtual(&result, | |
1762 group, thread_group, | |
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|
1763 vmSymbols::uncaughtException_name(), |
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|
1764 vmSymbols::thread_throwable_void_signature(), |
0 | 1765 threadObj, // Arg 1 |
1766 uncaught_exception, // Arg 2 | |
1767 THREAD); | |
1768 } | |
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1769 if (HAS_PENDING_EXCEPTION) { |
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|
1770 ResourceMark rm(this); |
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|
1771 jio_fprintf(defaultStream::error_stream(), |
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|
1772 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1773 " in thread \"%s\"\n", |
6983 | 1774 pending_exception()->klass()->external_name(), |
2200
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1775 get_thread_name()); |
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1776 CLEAR_PENDING_EXCEPTION; |
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1777 } |
0 | 1778 } |
1779 } | |
1780 | |
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1781 // Called before the java thread exit since we want to read info |
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1782 // from java_lang_Thread object |
10405 | 1783 EventThreadEnd event; |
1784 if (event.should_commit()) { | |
1785 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj())); | |
1786 event.commit(); | |
1787 } | |
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1788 |
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1789 // Call after last event on thread |
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1790 EVENT_THREAD_EXIT(this); |
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1791 |
0 | 1792 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
1793 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1794 // is deprecated anyhow. | |
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1795 if (!is_Compiler_thread()) { |
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1796 int count = 3; |
0 | 1797 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { |
1798 EXCEPTION_MARK; | |
1799 JavaValue result(T_VOID); | |
1142 | 1800 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1801 JavaCalls::call_virtual(&result, |
1802 threadObj, thread_klass, | |
2177
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1803 vmSymbols::exit_method_name(), |
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1804 vmSymbols::void_method_signature(), |
0 | 1805 THREAD); |
1806 CLEAR_PENDING_EXCEPTION; | |
1807 } | |
1808 } | |
1809 // notify JVMTI | |
1810 if (JvmtiExport::should_post_thread_life()) { | |
1811 JvmtiExport::post_thread_end(this); | |
1812 } | |
1813 | |
1814 // We have notified the agents that we are exiting, before we go on, | |
1815 // we must check for a pending external suspend request and honor it | |
1816 // in order to not surprise the thread that made the suspend request. | |
1817 while (true) { | |
1818 { | |
1819 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1820 if (!is_external_suspend()) { | |
1821 set_terminated(_thread_exiting); | |
1822 ThreadService::current_thread_exiting(this); | |
1823 break; | |
1824 } | |
1825 // Implied else: | |
1826 // Things get a little tricky here. We have a pending external | |
1827 // suspend request, but we are holding the SR_lock so we | |
1828 // can't just self-suspend. So we temporarily drop the lock | |
1829 // and then self-suspend. | |
1830 } | |
1831 | |
1832 ThreadBlockInVM tbivm(this); | |
1833 java_suspend_self(); | |
1834 | |
1835 // We're done with this suspend request, but we have to loop around | |
1836 // and check again. Eventually we will get SR_lock without a pending | |
1837 // external suspend request and will be able to mark ourselves as | |
1838 // exiting. | |
1839 } | |
1840 // no more external suspends are allowed at this point | |
1841 } else { | |
1842 // before_exit() has already posted JVMTI THREAD_END events | |
1843 } | |
1844 | |
1845 // Notify waiters on thread object. This has to be done after exit() is called | |
1846 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1847 // group should have the destroyed bit set before waiters are notified). | |
1848 ensure_join(this); | |
1849 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1850 | |
1851 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1852 // held by this thread must be released. A detach operation must only | |
1853 // get here if there are no Java frames on the stack. Therefore, any | |
1854 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1855 // pre-inflated and in the monitor cache. | |
1856 // | |
1857 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1858 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1859 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1860 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1861 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1862 } | |
1863 | |
1864 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1865 // is in a consistent state, in case GC happens | |
1866 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1867 | |
1868 if (active_handles() != NULL) { | |
1869 JNIHandleBlock* block = active_handles(); | |
1870 set_active_handles(NULL); | |
1871 JNIHandleBlock::release_block(block); | |
1872 } | |
1873 | |
1874 if (free_handle_block() != NULL) { | |
1875 JNIHandleBlock* block = free_handle_block(); | |
1876 set_free_handle_block(NULL); | |
1877 JNIHandleBlock::release_block(block); | |
1878 } | |
1879 | |
1880 // These have to be removed while this is still a valid thread. | |
1881 remove_stack_guard_pages(); | |
1882 | |
1883 if (UseTLAB) { | |
1884 tlab().make_parsable(true); // retire TLAB | |
1885 } | |
1886 | |
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1887 if (JvmtiEnv::environments_might_exist()) { |
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1888 JvmtiExport::cleanup_thread(this); |
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1889 } |
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1890 |
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1891 // We must flush any deferred card marks before removing a thread from |
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1892 // the list of active threads. |
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1893 Universe::heap()->flush_deferred_store_barrier(this); |
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1894 assert(deferred_card_mark().is_empty(), "Should have been flushed"); |
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1895 |
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1896 #if INCLUDE_ALL_GCS |
8011
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1897 // We must flush the G1-related buffers before removing a thread |
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1898 // from the list of active threads. We must do this after any deferred |
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1899 // card marks have been flushed (above) so that any entries that are |
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1900 // added to the thread's dirty card queue as a result are not lost. |
441
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1901 if (UseG1GC) { |
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1902 flush_barrier_queues(); |
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1903 } |
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1904 #endif // INCLUDE_ALL_GCS |
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1905 |
0 | 1906 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1907 Threads::remove(this); | |
1908 } | |
1909 | |
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1910 #if INCLUDE_ALL_GCS |
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1911 // Flush G1-related queues. |
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1912 void JavaThread::flush_barrier_queues() { |
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1913 satb_mark_queue().flush(); |
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1914 dirty_card_queue().flush(); |
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1915 } |
1842
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1916 |
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1917 void JavaThread::initialize_queues() { |
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1918 assert(!SafepointSynchronize::is_at_safepoint(), |
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1919 "we should not be at a safepoint"); |
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1920 |
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1921 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1922 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1923 // The SATB queue should have been constructed with its active |
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1924 // field set to false. |
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1925 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1926 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1927 // If we are creating the thread during a marking cycle, we should |
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1928 // set the active field of the SATB queue to true. |
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1929 if (satb_queue_set.is_active()) { |
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1930 satb_queue.set_active(true); |
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1931 } |
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1932 |
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|
1933 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1934 // The dirty card queue should have been constructed with its |
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1935 // active field set to true. |
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1936 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1937 } |
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1938 #endif // INCLUDE_ALL_GCS |
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1939 |
0 | 1940 void JavaThread::cleanup_failed_attach_current_thread() { |
441
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1941 if (get_thread_profiler() != NULL) { |
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1942 get_thread_profiler()->disengage(); |
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1943 ResourceMark rm; |
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1944 get_thread_profiler()->print(get_thread_name()); |
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1945 } |
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1946 |
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1947 if (active_handles() != NULL) { |
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1948 JNIHandleBlock* block = active_handles(); |
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1949 set_active_handles(NULL); |
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1950 JNIHandleBlock::release_block(block); |
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1951 } |
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1952 |
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1953 if (free_handle_block() != NULL) { |
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1954 JNIHandleBlock* block = free_handle_block(); |
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1955 set_free_handle_block(NULL); |
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1956 JNIHandleBlock::release_block(block); |
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1957 } |
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1958 |
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1959 // These have to be removed while this is still a valid thread. |
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1960 remove_stack_guard_pages(); |
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1961 |
441
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1962 if (UseTLAB) { |
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1963 tlab().make_parsable(true); // retire TLAB, if any |
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1964 } |
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1965 |
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1966 #if INCLUDE_ALL_GCS |
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1967 if (UseG1GC) { |
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1968 flush_barrier_queues(); |
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1969 } |
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1970 #endif // INCLUDE_ALL_GCS |
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1971 |
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1972 Threads::remove(this); |
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1973 delete this; |
0 | 1974 } |
1975 | |
1976 | |
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1977 |
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1978 |
0 | 1979 JavaThread* JavaThread::active() { |
1980 Thread* thread = ThreadLocalStorage::thread(); | |
1981 assert(thread != NULL, "just checking"); | |
1982 if (thread->is_Java_thread()) { | |
1983 return (JavaThread*) thread; | |
1984 } else { | |
1985 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
1986 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
1987 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
1988 assert(ret->is_Java_thread(), "must be a Java thread"); | |
1989 return ret; | |
1990 } | |
1991 } | |
1992 | |
1993 bool JavaThread::is_lock_owned(address adr) const { | |
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1994 if (Thread::is_lock_owned(adr)) return true; |
0 | 1995 |
1996 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
1997 if (chunk->contains(adr)) return true; | |
1998 } | |
1999 | |
2000 return false; | |
2001 } | |
2002 | |
2003 | |
2004 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
2005 chunk->set_next(monitor_chunks()); | |
2006 set_monitor_chunks(chunk); | |
2007 } | |
2008 | |
2009 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
2010 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
2011 if (monitor_chunks() == chunk) { | |
2012 set_monitor_chunks(chunk->next()); | |
2013 } else { | |
2014 MonitorChunk* prev = monitor_chunks(); | |
2015 while (prev->next() != chunk) prev = prev->next(); | |
2016 prev->set_next(chunk->next()); | |
2017 } | |
2018 } | |
2019 | |
2020 // JVM support. | |
2021 | |
2022 // Note: this function shouldn't block if it's called in | |
2023 // _thread_in_native_trans state (such as from | |
2024 // check_special_condition_for_native_trans()). | |
2025 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
2026 | |
2027 if (has_last_Java_frame() && has_async_condition()) { | |
2028 // If we are at a polling page safepoint (not a poll return) | |
2029 // then we must defer async exception because live registers | |
2030 // will be clobbered by the exception path. Poll return is | |
2031 // ok because the call we a returning from already collides | |
2032 // with exception handling registers and so there is no issue. | |
2033 // (The exception handling path kills call result registers but | |
2034 // this is ok since the exception kills the result anyway). | |
2035 | |
2036 if (is_at_poll_safepoint()) { | |
2037 // if the code we are returning to has deoptimized we must defer | |
2038 // the exception otherwise live registers get clobbered on the | |
2039 // exception path before deoptimization is able to retrieve them. | |
2040 // | |
2041 RegisterMap map(this, false); | |
2042 frame caller_fr = last_frame().sender(&map); | |
2043 assert(caller_fr.is_compiled_frame(), "what?"); | |
2044 if (caller_fr.is_deoptimized_frame()) { | |
2045 if (TraceExceptions) { | |
2046 ResourceMark rm; | |
2047 tty->print_cr("deferred async exception at compiled safepoint"); | |
2048 } | |
2049 return; | |
2050 } | |
2051 } | |
2052 } | |
2053 | |
2054 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
2055 if (condition == _no_async_condition) { | |
2056 // Conditions have changed since has_special_runtime_exit_condition() | |
2057 // was called: | |
2058 // - if we were here only because of an external suspend request, | |
2059 // then that was taken care of above (or cancelled) so we are done | |
2060 // - if we were here because of another async request, then it has | |
2061 // been cleared between the has_special_runtime_exit_condition() | |
2062 // and now so again we are done | |
2063 return; | |
2064 } | |
2065 | |
2066 // Check for pending async. exception | |
2067 if (_pending_async_exception != NULL) { | |
2068 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1142 | 2069 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2070 |
2071 // We cannot call Exceptions::_throw(...) here because we cannot block | |
2072 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
2073 | |
2074 if (TraceExceptions) { | |
2075 ResourceMark rm; | |
2076 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
2077 if (has_last_Java_frame() ) { | |
2078 frame f = last_frame(); | |
2079 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
2080 } | |
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2081 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2082 } |
2083 _pending_async_exception = NULL; | |
2084 clear_has_async_exception(); | |
2085 } | |
2086 } | |
2087 | |
2088 if (check_unsafe_error && | |
2089 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
2090 condition = _no_async_condition; // done | |
2091 switch (thread_state()) { | |
2092 case _thread_in_vm: | |
2093 { | |
2094 JavaThread* THREAD = this; | |
2095 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2096 } | |
2097 case _thread_in_native: | |
2098 { | |
2099 ThreadInVMfromNative tiv(this); | |
2100 JavaThread* THREAD = this; | |
2101 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2102 } | |
2103 case _thread_in_Java: | |
2104 { | |
2105 ThreadInVMfromJava tiv(this); | |
2106 JavaThread* THREAD = this; | |
2107 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
2108 } | |
2109 default: | |
2110 ShouldNotReachHere(); | |
2111 } | |
2112 } | |
2113 | |
2114 assert(condition == _no_async_condition || has_pending_exception() || | |
2115 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
2116 "must have handled the async condition, if no exception"); | |
2117 } | |
2118 | |
2119 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
2120 // | |
2121 // Check for pending external suspend. Internal suspend requests do | |
2122 // not use handle_special_runtime_exit_condition(). | |
2123 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2124 // thread is not the current thread. In older versions of jdbx, jdbx | |
2125 // threads could call into the VM with another thread's JNIEnv so we | |
2126 // can be here operating on behalf of a suspended thread (4432884). | |
2127 bool do_self_suspend = is_external_suspend_with_lock(); | |
2128 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
2129 // | |
2130 // Because thread is external suspended the safepoint code will count | |
2131 // thread as at a safepoint. This can be odd because we can be here | |
2132 // as _thread_in_Java which would normally transition to _thread_blocked | |
2133 // at a safepoint. We would like to mark the thread as _thread_blocked | |
2134 // before calling java_suspend_self like all other callers of it but | |
2135 // we must then observe proper safepoint protocol. (We can't leave | |
2136 // _thread_blocked with a safepoint in progress). However we can be | |
2137 // here as _thread_in_native_trans so we can't use a normal transition | |
2138 // constructor/destructor pair because they assert on that type of | |
2139 // transition. We could do something like: | |
2140 // | |
2141 // JavaThreadState state = thread_state(); | |
2142 // set_thread_state(_thread_in_vm); | |
2143 // { | |
2144 // ThreadBlockInVM tbivm(this); | |
2145 // java_suspend_self() | |
2146 // } | |
2147 // set_thread_state(_thread_in_vm_trans); | |
2148 // if (safepoint) block; | |
2149 // set_thread_state(state); | |
2150 // | |
2151 // but that is pretty messy. Instead we just go with the way the | |
2152 // code has worked before and note that this is the only path to | |
2153 // java_suspend_self that doesn't put the thread in _thread_blocked | |
2154 // mode. | |
2155 | |
2156 frame_anchor()->make_walkable(this); | |
2157 java_suspend_self(); | |
2158 | |
2159 // We might be here for reasons in addition to the self-suspend request | |
2160 // so check for other async requests. | |
2161 } | |
2162 | |
2163 if (check_asyncs) { | |
2164 check_and_handle_async_exceptions(); | |
2165 } | |
2166 } | |
2167 | |
2168 void JavaThread::send_thread_stop(oop java_throwable) { | |
2169 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
2170 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
2171 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
2172 | |
2173 // Do not throw asynchronous exceptions against the compiler thread | |
2174 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
2175 if (is_Compiler_thread()) return; | |
2176 | |
2177 { | |
2178 // Actually throw the Throwable against the target Thread - however | |
2179 // only if there is no thread death exception installed already. | |
1142 | 2180 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2181 // If the topmost frame is a runtime stub, then we are calling into |
2182 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
2183 // must deoptimize the caller before continuing, as the compiled exception handler table | |
2184 // may not be valid | |
2185 if (has_last_Java_frame()) { | |
2186 frame f = last_frame(); | |
2187 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
2188 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2189 RegisterMap reg_map(this, UseBiasedLocking); | |
2190 frame compiled_frame = f.sender(®_map); | |
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2191 if (!StressCompiledExceptionHandlers && compiled_frame.can_be_deoptimized()) { |
0 | 2192 Deoptimization::deoptimize(this, compiled_frame, ®_map); |
2193 } | |
2194 } | |
2195 } | |
2196 | |
2197 // Set async. pending exception in thread. | |
2198 set_pending_async_exception(java_throwable); | |
2199 | |
2200 if (TraceExceptions) { | |
2201 ResourceMark rm; | |
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2202 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2203 } |
2204 // for AbortVMOnException flag | |
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2205 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
0 | 2206 } |
2207 } | |
2208 | |
2209 | |
2210 // Interrupt thread so it will wake up from a potential wait() | |
2211 Thread::interrupt(this); | |
2212 } | |
2213 | |
2214 // External suspension mechanism. | |
2215 // | |
2216 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
2217 // to any VM_locks and it is at a transition | |
2218 // Self-suspension will happen on the transition out of the vm. | |
2219 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
2220 // | |
2221 // Guarantees on return: | |
2222 // + Target thread will not execute any new bytecode (that's why we need to | |
2223 // force a safepoint) | |
2224 // + Target thread will not enter any new monitors | |
2225 // | |
2226 void JavaThread::java_suspend() { | |
2227 { MutexLocker mu(Threads_lock); | |
2228 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
2229 return; | |
2230 } | |
2231 } | |
2232 | |
2233 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2234 if (!is_external_suspend()) { | |
2235 // a racing resume has cancelled us; bail out now | |
2236 return; | |
2237 } | |
2238 | |
2239 // suspend is done | |
2240 uint32_t debug_bits = 0; | |
2241 // Warning: is_ext_suspend_completed() may temporarily drop the | |
2242 // SR_lock to allow the thread to reach a stable thread state if | |
2243 // it is currently in a transient thread state. | |
2244 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
2245 SuspendRetryDelay, &debug_bits) ) { | |
2246 return; | |
2247 } | |
2248 } | |
2249 | |
2250 VM_ForceSafepoint vm_suspend; | |
2251 VMThread::execute(&vm_suspend); | |
2252 } | |
2253 | |
2254 // Part II of external suspension. | |
2255 // A JavaThread self suspends when it detects a pending external suspend | |
2256 // request. This is usually on transitions. It is also done in places | |
2257 // where continuing to the next transition would surprise the caller, | |
2258 // e.g., monitor entry. | |
2259 // | |
2260 // Returns the number of times that the thread self-suspended. | |
2261 // | |
2262 // Note: DO NOT call java_suspend_self() when you just want to block current | |
2263 // thread. java_suspend_self() is the second stage of cooperative | |
2264 // suspension for external suspend requests and should only be used | |
2265 // to complete an external suspend request. | |
2266 // | |
2267 int JavaThread::java_suspend_self() { | |
2268 int ret = 0; | |
2269 | |
2270 // we are in the process of exiting so don't suspend | |
2271 if (is_exiting()) { | |
2272 clear_external_suspend(); | |
2273 return ret; | |
2274 } | |
2275 | |
2276 assert(_anchor.walkable() || | |
2277 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
2278 "must have walkable stack"); | |
2279 | |
2280 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2281 | |
979 | 2282 assert(!this->is_ext_suspended(), |
0 | 2283 "a thread trying to self-suspend should not already be suspended"); |
2284 | |
2285 if (this->is_suspend_equivalent()) { | |
2286 // If we are self-suspending as a result of the lifting of a | |
2287 // suspend equivalent condition, then the suspend_equivalent | |
2288 // flag is not cleared until we set the ext_suspended flag so | |
2289 // that wait_for_ext_suspend_completion() returns consistent | |
2290 // results. | |
2291 this->clear_suspend_equivalent(); | |
2292 } | |
2293 | |
2294 // A racing resume may have cancelled us before we grabbed SR_lock | |
2295 // above. Or another external suspend request could be waiting for us | |
2296 // by the time we return from SR_lock()->wait(). The thread | |
2297 // that requested the suspension may already be trying to walk our | |
2298 // stack and if we return now, we can change the stack out from under | |
2299 // it. This would be a "bad thing (TM)" and cause the stack walker | |
2300 // to crash. We stay self-suspended until there are no more pending | |
2301 // external suspend requests. | |
2302 while (is_external_suspend()) { | |
2303 ret++; | |
2304 this->set_ext_suspended(); | |
2305 | |
2306 // _ext_suspended flag is cleared by java_resume() | |
2307 while (is_ext_suspended()) { | |
2308 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
2309 } | |
2310 } | |
2311 | |
2312 return ret; | |
2313 } | |
2314 | |
2315 #ifdef ASSERT | |
2316 // verify the JavaThread has not yet been published in the Threads::list, and | |
2317 // hence doesn't need protection from concurrent access at this stage | |
2318 void JavaThread::verify_not_published() { | |
2319 if (!Threads_lock->owned_by_self()) { | |
2320 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
2321 assert( !Threads::includes(this), | |
2322 "java thread shouldn't have been published yet!"); | |
2323 } | |
2324 else { | |
2325 assert( !Threads::includes(this), | |
2326 "java thread shouldn't have been published yet!"); | |
2327 } | |
2328 } | |
2329 #endif | |
2330 | |
2331 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2332 // progress or when _suspend_flags is non-zero. | |
2333 // Current thread needs to self-suspend if there is a suspend request and/or | |
2334 // block if a safepoint is in progress. | |
2335 // Async exception ISN'T checked. | |
2336 // Note only the ThreadInVMfromNative transition can call this function | |
2337 // directly and when thread state is _thread_in_native_trans | |
2338 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
2339 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
2340 | |
2341 JavaThread *curJT = JavaThread::current(); | |
2342 bool do_self_suspend = thread->is_external_suspend(); | |
2343 | |
2344 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
2345 | |
2346 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2347 // thread is not the current thread. In older versions of jdbx, jdbx | |
2348 // threads could call into the VM with another thread's JNIEnv so we | |
2349 // can be here operating on behalf of a suspended thread (4432884). | |
2350 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2351 JavaThreadState state = thread->thread_state(); | |
2352 | |
2353 // We mark this thread_blocked state as a suspend-equivalent so | |
2354 // that a caller to is_ext_suspend_completed() won't be confused. | |
2355 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2356 thread->set_suspend_equivalent(); | |
2357 | |
2358 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2359 // wait until the thread changes to other thread state. There is no | |
2360 // guarantee on how soon we can obtain the SR_lock and complete the | |
2361 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2362 // too long. Temporarily change the state to _thread_blocked to | |
2363 // let the VM thread know that this thread is ready for GC. The problem | |
2364 // of changing thread state is that safepoint could happen just after | |
2365 // java_suspend_self() returns after being resumed, and VM thread will | |
2366 // see the _thread_blocked state. We must check for safepoint | |
2367 // after restoring the state and make sure we won't leave while a safepoint | |
2368 // is in progress. | |
2369 thread->set_thread_state(_thread_blocked); | |
2370 thread->java_suspend_self(); | |
2371 thread->set_thread_state(state); | |
2372 // Make sure new state is seen by VM thread | |
2373 if (os::is_MP()) { | |
2374 if (UseMembar) { | |
2375 // Force a fence between the write above and read below | |
2376 OrderAccess::fence(); | |
2377 } else { | |
2378 // Must use this rather than serialization page in particular on Windows | |
2379 InterfaceSupport::serialize_memory(thread); | |
2380 } | |
2381 } | |
2382 } | |
2383 | |
2384 if (SafepointSynchronize::do_call_back()) { | |
2385 // If we are safepointing, then block the caller which may not be | |
2386 // the same as the target thread (see above). | |
2387 SafepointSynchronize::block(curJT); | |
2388 } | |
2389 | |
2390 if (thread->is_deopt_suspend()) { | |
2391 thread->clear_deopt_suspend(); | |
2392 RegisterMap map(thread, false); | |
2393 frame f = thread->last_frame(); | |
2394 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2395 f = f.sender(&map); | |
2396 } | |
2397 if (f.id() == thread->must_deopt_id()) { | |
2398 thread->clear_must_deopt_id(); | |
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2399 f.deoptimize(thread); |
0 | 2400 } else { |
2401 fatal("missed deoptimization!"); | |
2402 } | |
2403 } | |
2404 } | |
2405 | |
2406 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2407 // progress or when _suspend_flags is non-zero. | |
2408 // Current thread needs to self-suspend if there is a suspend request and/or | |
2409 // block if a safepoint is in progress. | |
2410 // Also check for pending async exception (not including unsafe access error). | |
2411 // Note only the native==>VM/Java barriers can call this function and when | |
2412 // thread state is _thread_in_native_trans. | |
2413 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2414 check_safepoint_and_suspend_for_native_trans(thread); | |
2415 | |
2416 if (thread->has_async_exception()) { | |
2417 // We are in _thread_in_native_trans state, don't handle unsafe | |
2418 // access error since that may block. | |
2419 thread->check_and_handle_async_exceptions(false); | |
2420 } | |
2421 } | |
2422 | |
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2423 // This is a variant of the normal |
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2424 // check_special_condition_for_native_trans with slightly different |
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2425 // semantics for use by critical native wrappers. It does all the |
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2426 // normal checks but also performs the transition back into |
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2427 // thread_in_Java state. This is required so that critical natives |
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2428 // can potentially block and perform a GC if they are the last thread |
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2429 // exiting the GC_locker. |
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2430 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
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2431 check_special_condition_for_native_trans(thread); |
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2432 |
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2433 // Finish the transition |
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2434 thread->set_thread_state(_thread_in_Java); |
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|
2435 |
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2436 if (thread->do_critical_native_unlock()) { |
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2437 ThreadInVMfromJavaNoAsyncException tiv(thread); |
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|
2438 GC_locker::unlock_critical(thread); |
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|
2439 thread->clear_critical_native_unlock(); |
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|
2440 } |
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|
2441 } |
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|
2442 |
0 | 2443 // We need to guarantee the Threads_lock here, since resumes are not |
2444 // allowed during safepoint synchronization | |
2445 // Can only resume from an external suspension | |
2446 void JavaThread::java_resume() { | |
2447 assert_locked_or_safepoint(Threads_lock); | |
2448 | |
2449 // Sanity check: thread is gone, has started exiting or the thread | |
2450 // was not externally suspended. | |
2451 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2452 return; | |
2453 } | |
2454 | |
2455 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2456 | |
2457 clear_external_suspend(); | |
2458 | |
2459 if (is_ext_suspended()) { | |
2460 clear_ext_suspended(); | |
2461 SR_lock()->notify_all(); | |
2462 } | |
2463 } | |
2464 | |
2465 void JavaThread::create_stack_guard_pages() { | |
2466 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2467 address low_addr = stack_base() - stack_size(); | |
2468 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2469 | |
2470 int allocate = os::allocate_stack_guard_pages(); | |
2471 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2472 | |
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2473 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
0 | 2474 warning("Attempt to allocate stack guard pages failed."); |
2475 return; | |
2476 } | |
2477 | |
2478 if (os::guard_memory((char *) low_addr, len)) { | |
2479 _stack_guard_state = stack_guard_enabled; | |
2480 } else { | |
2481 warning("Attempt to protect stack guard pages failed."); | |
2482 if (os::uncommit_memory((char *) low_addr, len)) { | |
2483 warning("Attempt to deallocate stack guard pages failed."); | |
2484 } | |
2485 } | |
2486 } | |
2487 | |
2488 void JavaThread::remove_stack_guard_pages() { | |
6882
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2489 assert(Thread::current() == this, "from different thread"); |
0 | 2490 if (_stack_guard_state == stack_guard_unused) return; |
2491 address low_addr = stack_base() - stack_size(); | |
2492 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2493 | |
2494 if (os::allocate_stack_guard_pages()) { | |
1320
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2495 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
0 | 2496 _stack_guard_state = stack_guard_unused; |
2497 } else { | |
2498 warning("Attempt to deallocate stack guard pages failed."); | |
2499 } | |
2500 } else { | |
2501 if (_stack_guard_state == stack_guard_unused) return; | |
2502 if (os::unguard_memory((char *) low_addr, len)) { | |
2503 _stack_guard_state = stack_guard_unused; | |
2504 } else { | |
2505 warning("Attempt to unprotect stack guard pages failed."); | |
2506 } | |
2507 } | |
2508 } | |
2509 | |
2510 void JavaThread::enable_stack_yellow_zone() { | |
2511 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2512 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2513 | |
2514 // The base notation is from the stacks point of view, growing downward. | |
2515 // We need to adjust it to work correctly with guard_memory() | |
2516 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2517 | |
2518 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2519 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2520 | |
2521 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2522 _stack_guard_state = stack_guard_enabled; | |
2523 } else { | |
2524 warning("Attempt to guard stack yellow zone failed."); | |
2525 } | |
2526 enable_register_stack_guard(); | |
2527 } | |
2528 | |
2529 void JavaThread::disable_stack_yellow_zone() { | |
2530 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2531 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2532 | |
2533 // Simply return if called for a thread that does not use guard pages. | |
2534 if (_stack_guard_state == stack_guard_unused) return; | |
2535 | |
2536 // The base notation is from the stacks point of view, growing downward. | |
2537 // We need to adjust it to work correctly with guard_memory() | |
2538 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2539 | |
2540 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2541 _stack_guard_state = stack_guard_yellow_disabled; | |
2542 } else { | |
2543 warning("Attempt to unguard stack yellow zone failed."); | |
2544 } | |
2545 disable_register_stack_guard(); | |
2546 } | |
2547 | |
2548 void JavaThread::enable_stack_red_zone() { | |
2549 // The base notation is from the stacks point of view, growing downward. | |
2550 // We need to adjust it to work correctly with guard_memory() | |
2551 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2552 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2553 | |
2554 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2555 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2556 | |
2557 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2558 warning("Attempt to guard stack red zone failed."); | |
2559 } | |
2560 } | |
2561 | |
2562 void JavaThread::disable_stack_red_zone() { | |
2563 // The base notation is from the stacks point of view, growing downward. | |
2564 // We need to adjust it to work correctly with guard_memory() | |
2565 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2566 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2567 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2568 warning("Attempt to unguard stack red zone failed."); | |
2569 } | |
2570 } | |
2571 | |
2572 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2573 // ignore is there is no stack | |
2574 if (!has_last_Java_frame()) return; | |
2575 // traverse the stack frames. Starts from top frame. | |
2576 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2577 frame* fr = fst.current(); | |
2578 f(fr, fst.register_map()); | |
2579 } | |
2580 } | |
2581 | |
2582 | |
2583 #ifndef PRODUCT | |
2584 // Deoptimization | |
2585 // Function for testing deoptimization | |
2586 void JavaThread::deoptimize() { | |
2587 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2588 StackFrameStream fst(this, UseBiasedLocking); | |
2589 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2590 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2591 // Iterate over all frames in the thread and deoptimize | |
2592 for(; !fst.is_done(); fst.next()) { | |
2593 if(fst.current()->can_be_deoptimized()) { | |
2594 | |
2595 if (only_at) { | |
2596 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2597 // consists of comma or carriage return separated numbers so | |
2598 // search for the current bci in that string. | |
2599 address pc = fst.current()->pc(); | |
2600 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2601 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2602 char buffer[8]; | |
2603 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2604 size_t len = strlen(buffer); | |
2605 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2606 while (found != NULL) { | |
2607 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2608 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2609 // Check that the bci found is bracketed by terminators. | |
2610 break; | |
2611 } | |
2612 found = strstr(found + 1, buffer); | |
2613 } | |
2614 if (!found) { | |
2615 continue; | |
2616 } | |
2617 } | |
2618 | |
2619 if (DebugDeoptimization && !deopt) { | |
2620 deopt = true; // One-time only print before deopt | |
2621 tty->print_cr("[BEFORE Deoptimization]"); | |
2622 trace_frames(); | |
2623 trace_stack(); | |
2624 } | |
2625 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2626 } | |
2627 } | |
2628 | |
2629 if (DebugDeoptimization && deopt) { | |
2630 tty->print_cr("[AFTER Deoptimization]"); | |
2631 trace_frames(); | |
2632 } | |
2633 } | |
2634 | |
2635 | |
2636 // Make zombies | |
2637 void JavaThread::make_zombies() { | |
2638 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2639 if (fst.current()->can_be_deoptimized()) { | |
2640 // it is a Java nmethod | |
2641 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2642 nm->make_not_entrant(); | |
2643 } | |
2644 } | |
2645 } | |
2646 #endif // PRODUCT | |
2647 | |
2648 | |
2649 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2650 if (!has_last_Java_frame()) return; | |
2651 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2652 StackFrameStream fst(this, UseBiasedLocking); | |
2653 for(; !fst.is_done(); fst.next()) { | |
2654 if (fst.current()->should_be_deoptimized()) { | |
6843 | 2655 if (LogCompilation && xtty != NULL) { |
2656 nmethod* nm = fst.current()->cb()->as_nmethod_or_null(); | |
2657 xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'", | |
2658 this->name(), nm != NULL ? nm->compile_id() : -1); | |
2659 } | |
2660 | |
0 | 2661 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); |
2662 } | |
2663 } | |
2664 } | |
2665 | |
2666 | |
2667 // GC support | |
2668 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2669 | |
2670 void JavaThread::gc_epilogue() { | |
2671 frames_do(frame_gc_epilogue); | |
2672 } | |
2673 | |
2674 | |
2675 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2676 | |
2677 void JavaThread::gc_prologue() { | |
2678 frames_do(frame_gc_prologue); | |
2679 } | |
2680 | |
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2681 // If the caller is a NamedThread, then remember, in the current scope, |
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|
2682 // the given JavaThread in its _processed_thread field. |
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|
2683 class RememberProcessedThread: public StackObj { |
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|
2684 NamedThread* _cur_thr; |
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|
2685 public: |
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|
2686 RememberProcessedThread(JavaThread* jthr) { |
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|
2687 Thread* thread = Thread::current(); |
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|
2688 if (thread->is_Named_thread()) { |
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|
2689 _cur_thr = (NamedThread *)thread; |
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|
2690 _cur_thr->set_processed_thread(jthr); |
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|
2691 } else { |
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|
2692 _cur_thr = NULL; |
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|
2693 } |
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|
2694 } |
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|
2695 |
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|
2696 ~RememberProcessedThread() { |
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|
2697 if (_cur_thr) { |
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|
2698 _cur_thr->set_processed_thread(NULL); |
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|
2699 } |
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|
2700 } |
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|
2701 }; |
0 | 2702 |
14483
be0ac0e8f6e7
8035393: Use CLDClosure instead of CLDToOopClosure in frame::oops_interpreted_do
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|
2703 void JavaThread::oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf) { |
1166 | 2704 // Verify that the deferred card marks have been flushed. |
2705 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
1027
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|
2706 |
0 | 2707 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
2708 // since there may be more than one thread using each ThreadProfiler. | |
2709 | |
2710 // Traverse the GCHandles | |
7179
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|
2711 Thread::oops_do(f, cld_f, cf); |
0 | 2712 |
2713 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2714 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2715 | |
2716 if (has_last_Java_frame()) { | |
1119
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|
2717 // Record JavaThread to GC thread |
547f81740344
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|
2718 RememberProcessedThread rpt(this); |
0 | 2719 |
2720 // Traverse the privileged stack | |
2721 if (_privileged_stack_top != NULL) { | |
2722 _privileged_stack_top->oops_do(f); | |
2723 } | |
2724 | |
2725 // traverse the registered growable array | |
2726 if (_array_for_gc != NULL) { | |
2727 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2728 f->do_oop(_array_for_gc->adr_at(index)); | |
2729 } | |
2730 } | |
2731 | |
2732 // Traverse the monitor chunks | |
2733 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2734 chunk->oops_do(f); | |
2735 } | |
2736 | |
2737 // Traverse the execution stack | |
2738 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2739 fst.current()->oops_do(f, cld_f, cf, fst.register_map()); |
0 | 2740 } |
2741 } | |
2742 | |
2743 // callee_target is never live across a gc point so NULL it here should | |
2744 // it still contain a methdOop. | |
2745 | |
2746 set_callee_target(NULL); | |
2747 | |
2748 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2749 // If we have deferred set_locals there might be oops waiting to be | |
2750 // written | |
2751 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2752 if (list != NULL) { | |
2753 for (int i = 0; i < list->length(); i++) { | |
2754 list->at(i)->oops_do(f); | |
2755 } | |
2756 } | |
2757 | |
2758 // Traverse instance variables at the end since the GC may be moving things | |
2759 // around using this function | |
2760 f->do_oop((oop*) &_threadObj); | |
2761 f->do_oop((oop*) &_vm_result); | |
2762 f->do_oop((oop*) &_exception_oop); | |
2763 f->do_oop((oop*) &_pending_async_exception); | |
2764 | |
2765 if (jvmti_thread_state() != NULL) { | |
2766 jvmti_thread_state()->oops_do(f); | |
2767 } | |
2768 } | |
2769 | |
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|
2770 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
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|
2771 Thread::nmethods_do(cf); // (super method is a no-op) |
0 | 2772 |
2773 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2774 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2775 | |
2776 if (has_last_Java_frame()) { | |
2777 // Traverse the execution stack | |
2778 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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|
2779 fst.current()->nmethods_do(cf); |
0 | 2780 } |
2781 } | |
2782 } | |
2783 | |
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|
2784 void JavaThread::metadata_do(void f(Metadata*)) { |
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|
2785 Thread::metadata_do(f); |
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|
2786 if (has_last_Java_frame()) { |
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|
2787 // Traverse the execution stack to call f() on the methods in the stack |
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|
2788 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
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|
2789 fst.current()->metadata_do(f); |
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diff
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|
2790 } |
da91efe96a93
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|
2791 } else if (is_Compiler_thread()) { |
da91efe96a93
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diff
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|
2792 // need to walk ciMetadata in current compile tasks to keep alive. |
da91efe96a93
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|
2793 CompilerThread* ct = (CompilerThread*)this; |
da91efe96a93
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diff
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|
2794 if (ct->env() != NULL) { |
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2795 ct->env()->metadata_do(f); |
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2796 } |
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2797 } |
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2798 } |
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2799 |
0 | 2800 // Printing |
2801 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2802 switch (_thread_state) { | |
2803 case _thread_uninitialized: return "_thread_uninitialized"; | |
2804 case _thread_new: return "_thread_new"; | |
2805 case _thread_new_trans: return "_thread_new_trans"; | |
2806 case _thread_in_native: return "_thread_in_native"; | |
2807 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2808 case _thread_in_vm: return "_thread_in_vm"; | |
2809 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2810 case _thread_in_Java: return "_thread_in_Java"; | |
2811 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2812 case _thread_blocked: return "_thread_blocked"; | |
2813 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2814 default: return "unknown thread state"; | |
2815 } | |
2816 } | |
2817 | |
2818 #ifndef PRODUCT | |
2819 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2820 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2821 }; | |
2822 void JavaThread::print_thread_state() const { | |
2823 print_thread_state_on(tty); | |
2824 }; | |
2825 #endif // PRODUCT | |
2826 | |
2827 // Called by Threads::print() for VM_PrintThreads operation | |
2828 void JavaThread::print_on(outputStream *st) const { | |
2829 st->print("\"%s\" ", get_thread_name()); | |
2830 oop thread_oop = threadObj(); | |
6766 | 2831 if (thread_oop != NULL) { |
2832 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); | |
2833 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2834 st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); | |
2835 } | |
0 | 2836 Thread::print_on(st); |
2837 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
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2838 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
0 | 2839 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
2840 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2841 } | |
2842 #ifndef PRODUCT | |
2843 print_thread_state_on(st); | |
2844 _safepoint_state->print_on(st); | |
2845 #endif // PRODUCT | |
2846 } | |
2847 | |
2848 // Called by fatal error handler. The difference between this and | |
2849 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2850 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2851 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2852 oop thread_obj = threadObj(); | |
2853 if (thread_obj != NULL) { | |
2854 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2855 } | |
2856 st->print(" ["); | |
2857 st->print("%s", _get_thread_state_name(_thread_state)); | |
2858 if (osthread()) { | |
2859 st->print(", id=%d", osthread()->thread_id()); | |
2860 } | |
2861 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2862 _stack_base - _stack_size, _stack_base); | |
2863 st->print("]"); | |
2864 return; | |
2865 } | |
2866 | |
2867 // Verification | |
2868 | |
2869 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2870 | |
2871 void JavaThread::verify() { | |
2872 // Verify oops in the thread. | |
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2873 oops_do(&VerifyOopClosure::verify_oop, NULL, NULL); |
0 | 2874 |
2875 // Verify the stack frames. | |
2876 frames_do(frame_verify); | |
2877 } | |
2878 | |
2879 // CR 6300358 (sub-CR 2137150) | |
2880 // Most callers of this method assume that it can't return NULL but a | |
2881 // thread may not have a name whilst it is in the process of attaching to | |
2882 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2883 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2884 // if vm exit occurs during initialization). These cases can all be accounted | |
2885 // for such that this method never returns NULL. | |
2886 const char* JavaThread::get_thread_name() const { | |
2887 #ifdef ASSERT | |
2888 // early safepoints can hit while current thread does not yet have TLS | |
2889 if (!SafepointSynchronize::is_at_safepoint()) { | |
2890 Thread *cur = Thread::current(); | |
2891 if (!(cur->is_Java_thread() && cur == this)) { | |
2892 // Current JavaThreads are allowed to get their own name without | |
2893 // the Threads_lock. | |
2894 assert_locked_or_safepoint(Threads_lock); | |
2895 } | |
2896 } | |
2897 #endif // ASSERT | |
2898 return get_thread_name_string(); | |
2899 } | |
2900 | |
2901 // Returns a non-NULL representation of this thread's name, or a suitable | |
2902 // descriptive string if there is no set name | |
2903 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2904 const char* name_str; | |
2905 oop thread_obj = threadObj(); | |
2906 if (thread_obj != NULL) { | |
2907 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2908 if (name != NULL) { | |
2909 if (buf == NULL) { | |
2910 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2911 } | |
2912 else { | |
2913 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2914 } | |
2915 } | |
4006 | 2916 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
0 | 2917 name_str = "<no-name - thread is attaching>"; |
2918 } | |
2919 else { | |
2920 name_str = Thread::name(); | |
2921 } | |
2922 } | |
2923 else { | |
2924 name_str = Thread::name(); | |
2925 } | |
2926 assert(name_str != NULL, "unexpected NULL thread name"); | |
2927 return name_str; | |
2928 } | |
2929 | |
2930 | |
2931 const char* JavaThread::get_threadgroup_name() const { | |
2932 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2933 oop thread_obj = threadObj(); | |
2934 if (thread_obj != NULL) { | |
2935 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2936 if (thread_group != NULL) { | |
2937 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
2938 // ThreadGroup.name can be null | |
2939 if (name != NULL) { | |
2940 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2941 return str; | |
2942 } | |
2943 } | |
2944 } | |
2945 return NULL; | |
2946 } | |
2947 | |
2948 const char* JavaThread::get_parent_name() const { | |
2949 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2950 oop thread_obj = threadObj(); | |
2951 if (thread_obj != NULL) { | |
2952 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2953 if (thread_group != NULL) { | |
2954 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
2955 if (parent != NULL) { | |
2956 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
2957 // ThreadGroup.name can be null | |
2958 if (name != NULL) { | |
2959 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2960 return str; | |
2961 } | |
2962 } | |
2963 } | |
2964 } | |
2965 return NULL; | |
2966 } | |
2967 | |
2968 ThreadPriority JavaThread::java_priority() const { | |
2969 oop thr_oop = threadObj(); | |
2970 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
2971 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
2972 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
2973 return priority; | |
2974 } | |
2975 | |
2976 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
2977 | |
2978 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
2979 // Link Java Thread object <-> C++ Thread | |
2980 | |
2981 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
2982 // and put it into a new Handle. The Handle "thread_oop" can then | |
2983 // be used to pass the C++ thread object to other methods. | |
2984 | |
2985 // Set the Java level thread object (jthread) field of the | |
2986 // new thread (a JavaThread *) to C++ thread object using the | |
2987 // "thread_oop" handle. | |
2988 | |
2989 // Set the thread field (a JavaThread *) of the | |
2990 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
2991 | |
2992 Handle thread_oop(Thread::current(), | |
2993 JNIHandles::resolve_non_null(jni_thread)); | |
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2994 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
0 | 2995 "must be initialized"); |
2996 set_threadObj(thread_oop()); | |
2997 java_lang_Thread::set_thread(thread_oop(), this); | |
2998 | |
2999 if (prio == NoPriority) { | |
3000 prio = java_lang_Thread::priority(thread_oop()); | |
3001 assert(prio != NoPriority, "A valid priority should be present"); | |
3002 } | |
3003 | |
3004 // Push the Java priority down to the native thread; needs Threads_lock | |
3005 Thread::set_priority(this, prio); | |
3006 | |
3007 // Add the new thread to the Threads list and set it in motion. | |
3008 // We must have threads lock in order to call Threads::add. | |
3009 // It is crucial that we do not block before the thread is | |
3010 // added to the Threads list for if a GC happens, then the java_thread oop | |
3011 // will not be visited by GC. | |
3012 Threads::add(this); | |
3013 } | |
3014 | |
3015 oop JavaThread::current_park_blocker() { | |
3016 // Support for JSR-166 locks | |
3017 oop thread_oop = threadObj(); | |
242 | 3018 if (thread_oop != NULL && |
3019 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 3020 return java_lang_Thread::park_blocker(thread_oop); |
3021 } | |
3022 return NULL; | |
3023 } | |
3024 | |
3025 | |
3026 void JavaThread::print_stack_on(outputStream* st) { | |
3027 if (!has_last_Java_frame()) return; | |
3028 ResourceMark rm; | |
3029 HandleMark hm; | |
3030 | |
3031 RegisterMap reg_map(this); | |
3032 vframe* start_vf = last_java_vframe(®_map); | |
3033 int count = 0; | |
3034 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3035 if (f->is_java_frame()) { | |
3036 javaVFrame* jvf = javaVFrame::cast(f); | |
3037 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
3038 | |
3039 // Print out lock information | |
3040 if (JavaMonitorsInStackTrace) { | |
3041 jvf->print_lock_info_on(st, count); | |
3042 } | |
3043 } else { | |
3044 // Ignore non-Java frames | |
3045 } | |
3046 | |
3047 // Bail-out case for too deep stacks | |
3048 count++; | |
3049 if (MaxJavaStackTraceDepth == count) return; | |
3050 } | |
3051 } | |
3052 | |
3053 | |
3054 // JVMTI PopFrame support | |
3055 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
3056 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
3057 if (in_bytes(size_in_bytes) != 0) { | |
6197 | 3058 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
0 | 3059 _popframe_preserved_args_size = in_bytes(size_in_bytes); |
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3060 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
0 | 3061 } |
3062 } | |
3063 | |
3064 void* JavaThread::popframe_preserved_args() { | |
3065 return _popframe_preserved_args; | |
3066 } | |
3067 | |
3068 ByteSize JavaThread::popframe_preserved_args_size() { | |
3069 return in_ByteSize(_popframe_preserved_args_size); | |
3070 } | |
3071 | |
3072 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
3073 int sz = in_bytes(popframe_preserved_args_size()); | |
3074 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
3075 return in_WordSize(sz / wordSize); | |
3076 } | |
3077 | |
3078 void JavaThread::popframe_free_preserved_args() { | |
3079 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
6197 | 3080 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
0 | 3081 _popframe_preserved_args = NULL; |
3082 _popframe_preserved_args_size = 0; | |
3083 } | |
3084 | |
3085 #ifndef PRODUCT | |
3086 | |
3087 void JavaThread::trace_frames() { | |
3088 tty->print_cr("[Describe stack]"); | |
3089 int frame_no = 1; | |
3090 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
3091 tty->print(" %d. ", frame_no++); | |
3092 fst.current()->print_value_on(tty,this); | |
3093 tty->cr(); | |
3094 } | |
3095 } | |
3096 | |
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3097 class PrintAndVerifyOopClosure: public OopClosure { |
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3098 protected: |
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3099 template <class T> inline void do_oop_work(T* p) { |
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3100 oop obj = oopDesc::load_decode_heap_oop(p); |
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3101 if (obj == NULL) return; |
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3102 tty->print(INTPTR_FORMAT ": ", p); |
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3103 if (obj->is_oop_or_null()) { |
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3104 if (obj->is_objArray()) { |
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3105 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
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3106 } else { |
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3107 obj->print(); |
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3108 } |
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3109 } else { |
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3110 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
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3111 } |
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3112 tty->cr(); |
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3113 } |
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3114 public: |
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3115 virtual void do_oop(oop* p) { do_oop_work(p); } |
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3116 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3117 }; |
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3118 |
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3119 |
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3120 static void oops_print(frame* f, const RegisterMap *map) { |
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3121 PrintAndVerifyOopClosure print; |
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3122 f->print_value(); |
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3123 f->oops_do(&print, NULL, NULL, (RegisterMap*)map); |
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3124 } |
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3125 |
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3126 // Print our all the locations that contain oops and whether they are |
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3127 // valid or not. This useful when trying to find the oldest frame |
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3128 // where an oop has gone bad since the frame walk is from youngest to |
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3129 // oldest. |
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3130 void JavaThread::trace_oops() { |
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3131 tty->print_cr("[Trace oops]"); |
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3132 frames_do(oops_print); |
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3133 } |
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3134 |
0 | 3135 |
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3136 #ifdef ASSERT |
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3137 // Print or validate the layout of stack frames |
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3138 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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diff
changeset
|
3139 ResourceMark rm; |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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diff
changeset
|
3140 PRESERVE_EXCEPTION_MARK; |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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2416
diff
changeset
|
3141 FrameValues values; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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diff
changeset
|
3142 int frame_no = 0; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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diff
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|
3143 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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diff
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|
3144 fst.current()->describe(values, ++frame_no); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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diff
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|
3145 if (depth == frame_no) break; |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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2416
diff
changeset
|
3146 } |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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diff
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|
3147 if (validate_only) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
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diff
changeset
|
3148 values.validate(); |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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diff
changeset
|
3149 } else { |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
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2416
diff
changeset
|
3150 tty->print_cr("[Describe stack layout]"); |
4042
b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
4007
diff
changeset
|
3151 values.print(this); |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
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2416
diff
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|
3152 } |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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diff
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|
3153 } |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3154 #endif |
3336
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|
3155 |
0 | 3156 void JavaThread::trace_stack_from(vframe* start_vf) { |
3157 ResourceMark rm; | |
3158 int vframe_no = 1; | |
3159 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3160 if (f->is_java_frame()) { | |
3161 javaVFrame::cast(f)->print_activation(vframe_no++); | |
3162 } else { | |
3163 f->print(); | |
3164 } | |
3165 if (vframe_no > StackPrintLimit) { | |
3166 tty->print_cr("...<more frames>..."); | |
3167 return; | |
3168 } | |
3169 } | |
3170 } | |
3171 | |
3172 | |
3173 void JavaThread::trace_stack() { | |
3174 if (!has_last_Java_frame()) return; | |
3175 ResourceMark rm; | |
3176 HandleMark hm; | |
3177 RegisterMap reg_map(this); | |
3178 trace_stack_from(last_java_vframe(®_map)); | |
3179 } | |
3180 | |
3181 | |
3182 #endif // PRODUCT | |
3183 | |
3184 | |
3185 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
3186 assert(reg_map != NULL, "a map must be given"); | |
3187 frame f = last_frame(); | |
3188 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
3189 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
3190 } | |
3191 return NULL; | |
3192 } | |
3193 | |
3194 | |
6725
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3195 Klass* JavaThread::security_get_caller_class(int depth) { |
0 | 3196 vframeStream vfst(this); |
3197 vfst.security_get_caller_frame(depth); | |
3198 if (!vfst.at_end()) { | |
3199 return vfst.method()->method_holder(); | |
3200 } | |
3201 return NULL; | |
3202 } | |
3203 | |
3204 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
3205 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
3206 CompileBroker::compiler_thread_loop(); | |
3207 } | |
3208 | |
3209 // Create a CompilerThread | |
3210 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
3211 : JavaThread(&compiler_thread_entry) { | |
3212 _env = NULL; | |
3213 _log = NULL; | |
3214 _task = NULL; | |
3215 _queue = queue; | |
3216 _counters = counters; | |
1584 | 3217 _buffer_blob = NULL; |
3384
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6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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3336
diff
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|
3218 _scanned_nmethod = NULL; |
12880
469216acdb28
8023014: CodeSweeperSweepNoFlushTest.java fails with HS crash
anoll
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12316
diff
changeset
|
3219 _compiler = NULL; |
0 | 3220 |
3221 #ifndef PRODUCT | |
3222 _ideal_graph_printer = NULL; | |
3223 #endif | |
3224 } | |
3225 | |
14483
be0ac0e8f6e7
8035393: Use CLDClosure instead of CLDToOopClosure in frame::oops_interpreted_do
stefank
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14314
diff
changeset
|
3226 void CompilerThread::oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf) { |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
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7177
diff
changeset
|
3227 JavaThread::oops_do(f, cld_f, cf); |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
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3336
diff
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|
3228 if (_scanned_nmethod != NULL && cf != NULL) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
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|
3229 // Safepoints can occur when the sweeper is scanning an nmethod so |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3230 // process it here to make sure it isn't unloaded in the middle of |
f52ed367b66d
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never
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3336
diff
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|
3231 // a scan. |
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never
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3336
diff
changeset
|
3232 cf->do_code_blob(_scanned_nmethod); |
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6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
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3336
diff
changeset
|
3233 } |
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3336
diff
changeset
|
3234 } |
0 | 3235 |
12880
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8023014: CodeSweeperSweepNoFlushTest.java fails with HS crash
anoll
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diff
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|
3236 |
0 | 3237 // ======= Threads ======== |
3238 | |
3239 // The Threads class links together all active threads, and provides | |
3240 // operations over all threads. It is protected by its own Mutex | |
3241 // lock, which is also used in other contexts to protect thread | |
3242 // operations from having the thread being operated on from exiting | |
3243 // and going away unexpectedly (e.g., safepoint synchronization) | |
3244 | |
3245 JavaThread* Threads::_thread_list = NULL; | |
3246 int Threads::_number_of_threads = 0; | |
3247 int Threads::_number_of_non_daemon_threads = 0; | |
3248 int Threads::_return_code = 0; | |
3249 size_t JavaThread::_stack_size_at_create = 0; | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
3250 #ifdef ASSERT |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
3251 bool Threads::_vm_complete = false; |
da91efe96a93
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coleenp
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|
3252 #endif |
0 | 3253 |
3254 // All JavaThreads | |
3255 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
3256 | |
3257 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
3258 void Threads::threads_do(ThreadClosure* tc) { | |
3259 assert_locked_or_safepoint(Threads_lock); | |
3260 // ALL_JAVA_THREADS iterates through all JavaThreads | |
3261 ALL_JAVA_THREADS(p) { | |
3262 tc->do_thread(p); | |
3263 } | |
3264 // Someday we could have a table or list of all non-JavaThreads. | |
3265 // For now, just manually iterate through them. | |
3266 tc->do_thread(VMThread::vm_thread()); | |
3267 Universe::heap()->gc_threads_do(tc); | |
323
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3268 WatcherThread *wt = WatcherThread::watcher_thread(); |
b33eef719520
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xlu
parents:
286
diff
changeset
|
3269 // Strictly speaking, the following NULL check isn't sufficient to make sure |
b33eef719520
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xlu
parents:
286
diff
changeset
|
3270 // the data for WatcherThread is still valid upon being examined. However, |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3271 // considering that WatchThread terminates when the VM is on the way to |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3272 // exit at safepoint, the chance of the above is extremely small. The right |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3273 // way to prevent termination of WatcherThread would be to acquire |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3274 // Terminator_lock, but we can't do that without violating the lock rank |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3275 // checking in some cases. |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3276 if (wt != NULL) |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3277 tc->do_thread(wt); |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3278 |
0 | 3279 // If CompilerThreads ever become non-JavaThreads, add them here |
3280 } | |
3281 | |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3282 |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3283 void Threads::initialize_java_lang_classes(JavaThread* main_thread, TRAPS) { |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3284 TraceTime timer("Initialize java.lang classes", TraceStartupTime); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3285 |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3286 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3287 create_vm_init_libraries(); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3288 } |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3289 |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3290 initialize_class(vmSymbols::java_lang_String(), CHECK); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3291 |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3292 // Initialize java_lang.System (needed before creating the thread) |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3293 initialize_class(vmSymbols::java_lang_System(), CHECK); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3294 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3295 Handle thread_group = create_initial_thread_group(CHECK); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3296 Universe::set_main_thread_group(thread_group()); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3297 initialize_class(vmSymbols::java_lang_Thread(), CHECK); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3298 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3299 main_thread->set_threadObj(thread_object); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3300 // Set thread status to running since main thread has |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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diff
changeset
|
3301 // been started and running. |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3302 java_lang_Thread::set_thread_status(thread_object, |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3303 java_lang_Thread::RUNNABLE); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3304 |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3305 // The VM creates & returns objects of this class. Make sure it's initialized. |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3306 initialize_class(vmSymbols::java_lang_Class(), CHECK); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3307 |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3308 // The VM preresolves methods to these classes. Make sure that they get initialized |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3309 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3310 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3311 call_initializeSystemClass(CHECK); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3312 |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3313 // get the Java runtime name after java.lang.System is initialized |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3314 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); |
febc6428bc79
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coleenp
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14291
diff
changeset
|
3315 JDK_Version::set_runtime_version(get_java_runtime_version(THREAD)); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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diff
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|
3316 |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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diff
changeset
|
3317 // an instance of OutOfMemory exception has been allocated earlier |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3318 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
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|
3319 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK); |
febc6428bc79
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coleenp
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14291
diff
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|
3320 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK); |
febc6428bc79
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coleenp
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14291
diff
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|
3321 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
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|
3322 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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diff
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|
3323 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK); |
febc6428bc79
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coleenp
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14291
diff
changeset
|
3324 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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diff
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|
3325 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK); |
febc6428bc79
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diff
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|
3326 } |
febc6428bc79
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coleenp
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diff
changeset
|
3327 |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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diff
changeset
|
3328 void Threads::initialize_jsr292_core_classes(TRAPS) { |
febc6428bc79
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coleenp
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diff
changeset
|
3329 initialize_class(vmSymbols::java_lang_invoke_MethodHandle(), CHECK); |
febc6428bc79
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coleenp
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diff
changeset
|
3330 initialize_class(vmSymbols::java_lang_invoke_MemberName(), CHECK); |
febc6428bc79
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coleenp
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14291
diff
changeset
|
3331 initialize_class(vmSymbols::java_lang_invoke_MethodHandleNatives(), CHECK); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3332 } |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3333 |
0 | 3334 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { |
3335 | |
242 | 3336 extern void JDK_Version_init(); |
3337 | |
0 | 3338 // Check version |
3339 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
3340 | |
3341 // Initialize the output stream module | |
3342 ostream_init(); | |
3343 | |
3344 // Process java launcher properties. | |
3345 Arguments::process_sun_java_launcher_properties(args); | |
3346 | |
3347 // Initialize the os module before using TLS | |
3348 os::init(); | |
3349 | |
3350 // Initialize system properties. | |
3351 Arguments::init_system_properties(); | |
3352 | |
14309 | 3353 // So that JDK version can be used as a discriminator when parsing arguments |
242 | 3354 JDK_Version_init(); |
3355 | |
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3356 // Update/Initialize System properties after JDK version number is known |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3357 Arguments::init_version_specific_system_properties(); |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3358 |
0 | 3359 // Parse arguments |
3360 jint parse_result = Arguments::parse(args); | |
3361 if (parse_result != JNI_OK) return parse_result; | |
3362 | |
12233
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12173
diff
changeset
|
3363 os::init_before_ergo(); |
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12173
diff
changeset
|
3364 |
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12173
diff
changeset
|
3365 jint ergo_result = Arguments::apply_ergo(); |
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12173
diff
changeset
|
3366 if (ergo_result != JNI_OK) return ergo_result; |
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12173
diff
changeset
|
3367 |
0 | 3368 if (PauseAtStartup) { |
3369 os::pause(); | |
3370 } | |
3371 | |
4006 | 3372 HOTSPOT_VM_INIT_BEGIN(); |
0 | 3373 |
3374 // Record VM creation timing statistics | |
3375 TraceVmCreationTime create_vm_timer; | |
3376 create_vm_timer.start(); | |
3377 | |
3378 // Timing (must come after argument parsing) | |
3379 TraceTime timer("Create VM", TraceStartupTime); | |
3380 | |
3381 // Initialize the os module after parsing the args | |
3382 jint os_init_2_result = os::init_2(); | |
3383 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
3384 | |
7177
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
brutisso
parents:
6985
diff
changeset
|
3385 jint adjust_after_os_result = Arguments::adjust_after_os(); |
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
brutisso
parents:
6985
diff
changeset
|
3386 if (adjust_after_os_result != JNI_OK) return adjust_after_os_result; |
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
brutisso
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6985
diff
changeset
|
3387 |
14309 | 3388 // initialize TLS |
6197 | 3389 ThreadLocalStorage::init(); |
3390 | |
3391 // Bootstrap native memory tracking, so it can start recording memory | |
3392 // activities before worker thread is started. This is the first phase | |
3393 // of bootstrapping, VM is currently running in single-thread mode. | |
3394 MemTracker::bootstrap_single_thread(); | |
3395 | |
0 | 3396 // Initialize output stream logging |
3397 ostream_init_log(); | |
3398 | |
3399 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
3400 // Must be before create_vm_init_agents() | |
3401 if (Arguments::init_libraries_at_startup()) { | |
3402 convert_vm_init_libraries_to_agents(); | |
3403 } | |
3404 | |
3405 // Launch -agentlib/-agentpath and converted -Xrun agents | |
3406 if (Arguments::init_agents_at_startup()) { | |
3407 create_vm_init_agents(); | |
3408 } | |
3409 | |
3410 // Initialize Threads state | |
3411 _thread_list = NULL; | |
3412 _number_of_threads = 0; | |
3413 _number_of_non_daemon_threads = 0; | |
3414 | |
3415 // Initialize global data structures and create system classes in heap | |
3416 vm_init_globals(); | |
3417 | |
3418 // Attach the main thread to this os thread | |
3419 JavaThread* main_thread = new JavaThread(); | |
3420 main_thread->set_thread_state(_thread_in_vm); | |
3421 // must do this before set_active_handles and initialize_thread_local_storage | |
3422 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
3423 // change the stack size recorded here to one based on the java thread | |
3424 // stacksize. This adjusted size is what is used to figure the placement | |
3425 // of the guard pages. | |
3426 main_thread->record_stack_base_and_size(); | |
3427 main_thread->initialize_thread_local_storage(); | |
3428 | |
3429 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
3430 | |
3431 if (!main_thread->set_as_starting_thread()) { | |
3432 vm_shutdown_during_initialization( | |
3433 "Failed necessary internal allocation. Out of swap space"); | |
3434 delete main_thread; | |
3435 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3436 return JNI_ENOMEM; | |
3437 } | |
3438 | |
3439 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
3440 // crash Linux VM, see notes in os_linux.cpp. | |
3441 main_thread->create_stack_guard_pages(); | |
3442 | |
1878 | 3443 // Initialize Java-Level synchronization subsystem |
3444 ObjectMonitor::Initialize() ; | |
0 | 3445 |
6197 | 3446 // Second phase of bootstrapping, VM is about entering multi-thread mode |
3447 MemTracker::bootstrap_multi_thread(); | |
3448 | |
0 | 3449 // Initialize global modules |
3450 jint status = init_globals(); | |
3451 if (status != JNI_OK) { | |
3452 delete main_thread; | |
3453 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3454 return status; | |
3455 } | |
3456 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3457 // Should be done after the heap is fully created |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3458 main_thread->cache_global_variables(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3459 |
0 | 3460 HandleMark hm; |
3461 | |
3462 { MutexLocker mu(Threads_lock); | |
3463 Threads::add(main_thread); | |
3464 } | |
3465 | |
3466 // Any JVMTI raw monitors entered in onload will transition into | |
3467 // real raw monitor. VM is setup enough here for raw monitor enter. | |
3468 JvmtiExport::transition_pending_onload_raw_monitors(); | |
3469 | |
6197 | 3470 // Fully start NMT |
3471 MemTracker::start(); | |
3472 | |
0 | 3473 // Create the VMThread |
3474 { TraceTime timer("Start VMThread", TraceStartupTime); | |
3475 VMThread::create(); | |
3476 Thread* vmthread = VMThread::vm_thread(); | |
3477 | |
3478 if (!os::create_thread(vmthread, os::vm_thread)) | |
3479 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
3480 | |
3481 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
3482 // Monitors can have spurious returns, must always check another state flag | |
3483 { | |
3484 MutexLocker ml(Notify_lock); | |
3485 os::start_thread(vmthread); | |
3486 while (vmthread->active_handles() == NULL) { | |
3487 Notify_lock->wait(); | |
3488 } | |
3489 } | |
3490 } | |
3491 | |
3492 assert (Universe::is_fully_initialized(), "not initialized"); | |
9071
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8855
diff
changeset
|
3493 if (VerifyDuringStartup) { |
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
9071
diff
changeset
|
3494 // Make sure we're starting with a clean slate. |
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
9071
diff
changeset
|
3495 VM_Verify verify_op; |
9071
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8855
diff
changeset
|
3496 VMThread::execute(&verify_op); |
8855
24ef5fb05e0f
8010463: G1: Crashes with -UseTLAB and heap verification
johnc
parents:
8793
diff
changeset
|
3497 } |
24ef5fb05e0f
8010463: G1: Crashes with -UseTLAB and heap verification
johnc
parents:
8793
diff
changeset
|
3498 |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3499 Thread* THREAD = Thread::current(); |
0 | 3500 |
3501 // At this point, the Universe is initialized, but we have not executed | |
3502 // any byte code. Now is a good time (the only time) to dump out the | |
3503 // internal state of the JVM for sharing. | |
3504 if (DumpSharedSpaces) { | |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3505 MetaspaceShared::preload_and_dump(CHECK_JNI_ERR); |
0 | 3506 ShouldNotReachHere(); |
3507 } | |
3508 | |
3509 // Always call even when there are not JVMTI environments yet, since environments | |
3510 // may be attached late and JVMTI must track phases of VM execution | |
3511 JvmtiExport::enter_start_phase(); | |
3512 | |
3513 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
3514 JvmtiExport::post_vm_start(); | |
3515 | |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3516 initialize_java_lang_classes(main_thread, CHECK_JNI_ERR); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3517 |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3518 // We need this for ClassDataSharing - the initial vm.info property is set |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3519 // with the default value of CDS "sharing" which may be reset through |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3520 // command line options. |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3521 reset_vm_info_property(CHECK_JNI_ERR); |
0 | 3522 |
3523 quicken_jni_functions(); | |
3524 | |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3525 // Must be run after init_ft which initializes ft_enabled |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3526 if (TRACE_INITIALIZE() != JNI_OK) { |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3527 vm_exit_during_initialization("Failed to initialize tracing backend"); |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3528 } |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3529 |
0 | 3530 // Set flag that basic initialization has completed. Used by exceptions and various |
3531 // debug stuff, that does not work until all basic classes have been initialized. | |
3532 set_init_completed(); | |
3533 | |
4006 | 3534 HOTSPOT_VM_INIT_END(); |
0 | 3535 |
3536 // record VM initialization completion time | |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3537 #if INCLUDE_MANAGEMENT |
0 | 3538 Management::record_vm_init_completed(); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3539 #endif // INCLUDE_MANAGEMENT |
0 | 3540 |
3541 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3542 // valid exceptions may be thrown in the process. | |
3543 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3544 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3545 // anymore. We call vm_exit_during_initialization directly instead. | |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3546 SystemDictionary::compute_java_system_loader(CHECK_JNI_ERR); |
0 | 3547 |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3548 #if INCLUDE_ALL_GCS |
0 | 3549 // Support for ConcurrentMarkSweep. This should be cleaned up |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3550 // 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
|
3551 // once things are properly refactored. XXX YSR |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3552 if (UseConcMarkSweepGC || UseG1GC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3553 if (UseConcMarkSweepGC) { |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3554 ConcurrentMarkSweepThread::makeSurrogateLockerThread(CHECK_JNI_ERR); |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3555 } else { |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3556 ConcurrentMarkThread::makeSurrogateLockerThread(CHECK_JNI_ERR); |
0 | 3557 } |
3558 } | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3559 #endif // INCLUDE_ALL_GCS |
0 | 3560 |
3561 // Always call even when there are not JVMTI environments yet, since environments | |
3562 // may be attached late and JVMTI must track phases of VM execution | |
3563 JvmtiExport::enter_live_phase(); | |
3564 | |
3565 // Signal Dispatcher needs to be started before VMInit event is posted | |
3566 os::signal_init(); | |
3567 | |
3568 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3569 if (!DisableAttachMechanism) { | |
11139
2e8f19c2feef
7162400: Intermittent java.io.IOException: Bad file number during HotSpotVirtualMachine.executeCommand
allwin
parents:
11136
diff
changeset
|
3570 AttachListener::vm_start(); |
0 | 3571 if (StartAttachListener || AttachListener::init_at_startup()) { |
3572 AttachListener::init(); | |
3573 } | |
3574 } | |
3575 | |
3576 // Launch -Xrun agents | |
3577 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3578 // back-end can launch with -Xdebug -Xrunjdwp. | |
3579 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3580 create_vm_init_libraries(); | |
3581 } | |
3582 | |
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3583 // 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
|
3584 JvmtiExport::post_vm_initialized(); |
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3585 |
10405 | 3586 if (TRACE_START() != JNI_OK) { |
3587 vm_exit_during_initialization("Failed to start tracing backend."); | |
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3588 } |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3589 |
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3590 if (CleanChunkPoolAsync) { |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3591 Chunk::start_chunk_pool_cleaner_task(); |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3592 } |
0 | 3593 |
3594 // initialize compiler(s) | |
7195 | 3595 #if defined(COMPILER1) || defined(COMPILER2) || defined(SHARK) |
0 | 3596 CompileBroker::compilation_init(); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3597 #endif |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3598 |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3599 // Pre-initialize some JSR292 core classes to avoid deadlock during class loading. |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3600 // It is done after compilers are initialized, because otherwise compilations of |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3601 // signature polymorphic MH intrinsics can be missed |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3602 // (see SystemDictionary::find_method_handle_intrinsic). |
12163
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3603 if (EnableInvokeDynamic) { |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3604 initialize_jsr292_core_classes(CHECK_JNI_ERR); |
12163
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3605 } |
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3606 |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3607 #if INCLUDE_MANAGEMENT |
0 | 3608 Management::initialize(THREAD); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3609 |
0 | 3610 if (HAS_PENDING_EXCEPTION) { |
3611 // management agent fails to start possibly due to | |
3612 // configuration problem and is responsible for printing | |
3613 // stack trace if appropriate. Simply exit VM. | |
3614 vm_exit(1); | |
3615 } | |
14297
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8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3616 #endif // INCLUDE_MANAGEMENT |
0 | 3617 |
3618 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3619 if (MemProfiling) MemProfiler::engage(); | |
3620 StatSampler::engage(); | |
3621 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3622 | |
3623 BiasedLocking::init(); | |
3624 | |
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3625 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
|
3626 call_postVMInitHook(THREAD); |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3627 // 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
|
3628 // exceptions and provide means of diagnosis. |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3629 if (HAS_PENDING_EXCEPTION) { |
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3630 CLEAR_PENDING_EXCEPTION; |
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3631 } |
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3632 } |
0 | 3633 |
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3634 { |
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3635 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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3636 // Make sure the watcher thread can be started by WatcherThread::start() |
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3637 // or by dynamic enrollment. |
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3638 WatcherThread::make_startable(); |
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3639 // Start up the WatcherThread if there are any periodic tasks |
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3640 // NOTE: All PeriodicTasks should be registered by now. If they |
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3641 // aren't, late joiners might appear to start slowly (we might |
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3642 // take a while to process their first tick). |
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3643 if (PeriodicTask::num_tasks() > 0) { |
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3644 WatcherThread::start(); |
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3645 } |
0 | 3646 } |
3647 | |
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3648 // Give os specific code one last chance to start |
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3649 os::init_3(); |
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3650 |
0 | 3651 create_vm_timer.end(); |
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3652 #ifdef ASSERT |
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3653 _vm_complete = true; |
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3654 #endif |
0 | 3655 return JNI_OK; |
3656 } | |
3657 | |
3658 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3659 extern "C" { | |
3660 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3661 } | |
3662 // Find a command line agent library and return its entry point for | |
3663 // -agentlib: -agentpath: -Xrun | |
3664 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3665 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3666 OnLoadEntry_t on_load_entry = NULL; | |
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3667 void *library = NULL; |
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3668 |
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3669 if (!agent->valid()) { |
0 | 3670 char buffer[JVM_MAXPATHLEN]; |
3671 char ebuf[1024]; | |
3672 const char *name = agent->name(); | |
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3673 const char *msg = "Could not find agent library "; |
0 | 3674 |
12220 | 3675 // First check to see if agent is statically linked into executable |
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3676 if (os::find_builtin_agent(agent, on_load_symbols, num_symbol_entries)) { |
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3677 library = agent->os_lib(); |
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3678 } else if (agent->is_absolute_path()) { |
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3679 library = os::dll_load(name, ebuf, sizeof ebuf); |
0 | 3680 if (library == NULL) { |
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3681 const char *sub_msg = " in absolute path, with error: "; |
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3682 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3683 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
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3684 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3685 // If we can't find the agent, exit. |
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3686 vm_exit_during_initialization(buf, NULL); |
6197 | 3687 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3688 } |
3689 } else { | |
3690 // Try to load the agent from the standard dll directory | |
6966
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|
3691 if (os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
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|
3692 name)) { |
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3693 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
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3694 } |
0 | 3695 if (library == NULL) { // Try the local directory |
3696 char ns[1] = {0}; | |
6966
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|
3697 if (os::dll_build_name(buffer, sizeof(buffer), ns, name)) { |
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3698 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
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3699 } |
0 | 3700 if (library == NULL) { |
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3701 const char *sub_msg = " on the library path, with error: "; |
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3702 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3703 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
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|
3704 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3705 // If we can't find the agent, exit. |
1694
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|
3706 vm_exit_during_initialization(buf, NULL); |
6197 | 3707 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3708 } |
3709 } | |
3710 } | |
3711 agent->set_os_lib(library); | |
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3712 agent->set_valid(); |
0 | 3713 } |
3714 | |
3715 // Find the OnLoad function. | |
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|
3716 on_load_entry = |
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|
3717 CAST_TO_FN_PTR(OnLoadEntry_t, os::find_agent_function(agent, |
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|
3718 false, |
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|
3719 on_load_symbols, |
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|
3720 num_symbol_entries)); |
0 | 3721 return on_load_entry; |
3722 } | |
3723 | |
3724 // Find the JVM_OnLoad entry point | |
3725 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3726 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3727 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3728 } | |
3729 | |
3730 // Find the Agent_OnLoad entry point | |
3731 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3732 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3733 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3734 } | |
3735 | |
3736 // For backwards compatibility with -Xrun | |
3737 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3738 // treated like -agentpath: | |
3739 // Must be called before agent libraries are created | |
3740 void Threads::convert_vm_init_libraries_to_agents() { | |
3741 AgentLibrary* agent; | |
3742 AgentLibrary* next; | |
3743 | |
3744 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3745 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3746 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3747 | |
3748 // If there is an JVM_OnLoad function it will get called later, | |
3749 // otherwise see if there is an Agent_OnLoad | |
3750 if (on_load_entry == NULL) { | |
3751 on_load_entry = lookup_agent_on_load(agent); | |
3752 if (on_load_entry != NULL) { | |
3753 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3754 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3755 Arguments::convert_library_to_agent(agent); | |
3756 } else { | |
3757 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3758 } | |
3759 } | |
3760 } | |
3761 } | |
3762 | |
3763 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3764 // Invokes Agent_OnLoad | |
3765 // Called very early -- before JavaThreads exist | |
3766 void Threads::create_vm_init_agents() { | |
3767 extern struct JavaVM_ main_vm; | |
3768 AgentLibrary* agent; | |
3769 | |
3770 JvmtiExport::enter_onload_phase(); | |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
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6769
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|
3771 |
0 | 3772 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { |
3773 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3774 | |
3775 if (on_load_entry != NULL) { | |
3776 // Invoke the Agent_OnLoad function | |
3777 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3778 if (err != JNI_OK) { | |
3779 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3780 } | |
3781 } else { | |
3782 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3783 } | |
3784 } | |
3785 JvmtiExport::enter_primordial_phase(); | |
3786 } | |
3787 | |
3788 extern "C" { | |
3789 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3790 } | |
3791 | |
3792 void Threads::shutdown_vm_agents() { | |
3793 // Send any Agent_OnUnload notifications | |
3794 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
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|
3795 size_t num_symbol_entries = ARRAY_SIZE(on_unload_symbols); |
0 | 3796 extern struct JavaVM_ main_vm; |
3797 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3798 | |
3799 // Find the Agent_OnUnload function. | |
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|
3800 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, |
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|
3801 os::find_agent_function(agent, |
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|
3802 false, |
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|
3803 on_unload_symbols, |
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|
3804 num_symbol_entries)); |
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|
3805 |
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|
3806 // Invoke the Agent_OnUnload function |
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|
3807 if (unload_entry != NULL) { |
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|
3808 JavaThread* thread = JavaThread::current(); |
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|
3809 ThreadToNativeFromVM ttn(thread); |
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|
3810 HandleMark hm(thread); |
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|
3811 (*unload_entry)(&main_vm); |
0 | 3812 } |
3813 } | |
3814 } | |
3815 | |
3816 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3817 // Invokes JVM_OnLoad | |
3818 void Threads::create_vm_init_libraries() { | |
3819 extern struct JavaVM_ main_vm; | |
3820 AgentLibrary* agent; | |
3821 | |
3822 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3823 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3824 | |
3825 if (on_load_entry != NULL) { | |
3826 // Invoke the JVM_OnLoad function | |
3827 JavaThread* thread = JavaThread::current(); | |
3828 ThreadToNativeFromVM ttn(thread); | |
3829 HandleMark hm(thread); | |
3830 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3831 if (err != JNI_OK) { | |
3832 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3833 } | |
3834 } else { | |
3835 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3836 } | |
3837 } | |
3838 } | |
3839 | |
3840 // Last thread running calls java.lang.Shutdown.shutdown() | |
3841 void JavaThread::invoke_shutdown_hooks() { | |
3842 HandleMark hm(this); | |
3843 | |
3844 // We could get here with a pending exception, if so clear it now. | |
3845 if (this->has_pending_exception()) { | |
3846 this->clear_pending_exception(); | |
3847 } | |
3848 | |
3849 EXCEPTION_MARK; | |
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3850 Klass* k = |
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|
3851 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
0 | 3852 THREAD); |
3853 if (k != NULL) { | |
3854 // SystemDictionary::resolve_or_null will return null if there was | |
3855 // an exception. If we cannot load the Shutdown class, just don't | |
3856 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3857 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3858 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3859 // was called, the Shutdown class would have already been loaded | |
3860 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3861 instanceKlassHandle shutdown_klass (THREAD, k); | |
3862 JavaValue result(T_VOID); | |
3863 JavaCalls::call_static(&result, | |
3864 shutdown_klass, | |
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|
3865 vmSymbols::shutdown_method_name(), |
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3866 vmSymbols::void_method_signature(), |
0 | 3867 THREAD); |
3868 } | |
3869 CLEAR_PENDING_EXCEPTION; | |
3870 } | |
3871 | |
3872 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3873 // the program falls off the end of main(). Another VM exit path is through | |
3874 // vm_exit() when the program calls System.exit() to return a value or when | |
3875 // there is a serious error in VM. The two shutdown paths are not exactly | |
3876 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3877 // and VM_Exit op at VM level. | |
3878 // | |
3879 // Shutdown sequence: | |
6197 | 3880 // + Shutdown native memory tracking if it is on |
0 | 3881 // + Wait until we are the last non-daemon thread to execute |
3882 // <-- every thing is still working at this moment --> | |
3883 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3884 // shutdown hooks, run finalizers if finalization-on-exit | |
3885 // + Call before_exit(), prepare for VM exit | |
3886 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3887 // currently the only user of this mechanism is File.deleteOnExit()) | |
3888 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3889 // post thread end and vm death events to JVMTI, | |
3890 // stop signal thread | |
3891 // + Call JavaThread::exit(), it will: | |
3892 // > release JNI handle blocks, remove stack guard pages | |
3893 // > remove this thread from Threads list | |
3894 // <-- no more Java code from this thread after this point --> | |
3895 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3896 // the compiler threads at safepoint | |
3897 // <-- do not use anything that could get blocked by Safepoint --> | |
3898 // + Disable tracing at JNI/JVM barriers | |
3899 // + Set _vm_exited flag for threads that are still running native code | |
3900 // + Delete this thread | |
3901 // + Call exit_globals() | |
3902 // > deletes tty | |
3903 // > deletes PerfMemory resources | |
3904 // + Return to caller | |
3905 | |
3906 bool Threads::destroy_vm() { | |
3907 JavaThread* thread = JavaThread::current(); | |
3908 | |
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|
3909 #ifdef ASSERT |
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3910 _vm_complete = false; |
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3911 #endif |
0 | 3912 // Wait until we are the last non-daemon thread to execute |
3913 { MutexLocker nu(Threads_lock); | |
3914 while (Threads::number_of_non_daemon_threads() > 1 ) | |
3915 // This wait should make safepoint checks, wait without a timeout, | |
3916 // and wait as a suspend-equivalent condition. | |
3917 // | |
3918 // Note: If the FlatProfiler is running and this thread is waiting | |
3919 // for another non-daemon thread to finish, then the FlatProfiler | |
3920 // is waiting for the external suspend request on this thread to | |
3921 // complete. wait_for_ext_suspend_completion() will eventually | |
3922 // timeout, but that takes time. Making this wait a suspend- | |
3923 // equivalent condition solves that timeout problem. | |
3924 // | |
3925 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
3926 Mutex::_as_suspend_equivalent_flag); | |
3927 } | |
3928 | |
3929 // Hang forever on exit if we are reporting an error. | |
3930 if (ShowMessageBoxOnError && is_error_reported()) { | |
3931 os::infinite_sleep(); | |
3932 } | |
2302
da091bb67459
7022037: Pause when exiting if debugger is attached on windows
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2203
diff
changeset
|
3933 os::wait_for_keypress_at_exit(); |
0 | 3934 |
3935 if (JDK_Version::is_jdk12x_version()) { | |
3936 // We are the last thread running, so check if finalizers should be run. | |
3937 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
3938 HandleMark rm(thread); | |
3939 Universe::run_finalizers_on_exit(); | |
3940 } else { | |
3941 // run Java level shutdown hooks | |
3942 thread->invoke_shutdown_hooks(); | |
3943 } | |
3944 | |
3945 before_exit(thread); | |
3946 | |
3947 thread->exit(true); | |
3948 | |
3949 // Stop VM thread. | |
3950 { | |
3951 // 4945125 The vm thread comes to a safepoint during exit. | |
3952 // GC vm_operations can get caught at the safepoint, and the | |
3953 // heap is unparseable if they are caught. Grab the Heap_lock | |
3954 // to prevent this. The GC vm_operations will not be able to | |
3955 // queue until after the vm thread is dead. | |
3769
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7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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3956 // After this point, we'll never emerge out of the safepoint before |
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7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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|
3957 // the VM exits, so concurrent GC threads do not need to be explicitly |
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7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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|
3958 // stopped; they remain inactive until the process exits. |
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7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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|
3959 // Note: some concurrent G1 threads may be running during a safepoint, |
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7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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diff
changeset
|
3960 // but these will not be accessing the heap, just some G1-specific side |
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7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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3961 // data structures that are not accessed by any other threads but them |
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|
3962 // after this point in a terminal safepoint. |
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|
3963 |
0 | 3964 MutexLocker ml(Heap_lock); |
3965 | |
3966 VMThread::wait_for_vm_thread_exit(); | |
3967 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
3968 VMThread::destroy(); | |
3969 } | |
3970 | |
3971 // clean up ideal graph printers | |
3972 #if defined(COMPILER2) && !defined(PRODUCT) | |
3973 IdealGraphPrinter::clean_up(); | |
3974 #endif | |
3975 | |
3976 // Now, all Java threads are gone except daemon threads. Daemon threads | |
3977 // running Java code or in VM are stopped by the Safepoint. However, | |
3978 // daemon threads executing native code are still running. But they | |
3979 // will be stopped at native=>Java/VM barriers. Note that we can't | |
3980 // simply kill or suspend them, as it is inherently deadlock-prone. | |
3981 | |
3982 #ifndef PRODUCT | |
3983 // disable function tracing at JNI/JVM barriers | |
3984 TraceJNICalls = false; | |
3985 TraceJVMCalls = false; | |
3986 TraceRuntimeCalls = false; | |
3987 #endif | |
3988 | |
3989 VM_Exit::set_vm_exited(); | |
3990 | |
3991 notify_vm_shutdown(); | |
3992 | |
3993 delete thread; | |
3994 | |
3995 // exit_globals() will delete tty | |
3996 exit_globals(); | |
3997 | |
3998 return true; | |
3999 } | |
4000 | |
4001 | |
4002 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
4003 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
4004 return is_supported_jni_version(version); | |
4005 } | |
4006 | |
4007 | |
4008 jboolean Threads::is_supported_jni_version(jint version) { | |
4009 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
4010 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
4011 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
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499ccc15bbc8
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4012 if (version == JNI_VERSION_1_8) return JNI_TRUE; |
0 | 4013 return JNI_FALSE; |
4014 } | |
4015 | |
4016 | |
4017 void Threads::add(JavaThread* p, bool force_daemon) { | |
4018 // The threads lock must be owned at this point | |
4019 assert_locked_or_safepoint(Threads_lock); | |
1842
6e0aac35bfa9
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|
4020 |
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|
4021 // See the comment for this method in thread.hpp for its purpose and |
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
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|
4022 // why it is called here. |
6e0aac35bfa9
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|
4023 p->initialize_queues(); |
0 | 4024 p->set_next(_thread_list); |
4025 _thread_list = p; | |
4026 _number_of_threads++; | |
4027 oop threadObj = p->threadObj(); | |
4028 bool daemon = true; | |
4029 // Bootstrapping problem: threadObj can be null for initial | |
4030 // JavaThread (or for threads attached via JNI) | |
4031 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
4032 _number_of_non_daemon_threads++; | |
4033 daemon = false; | |
4034 } | |
4035 | |
6197 | 4036 p->set_safepoint_visible(true); |
4037 | |
0 | 4038 ThreadService::add_thread(p, daemon); |
4039 | |
4040 // Possible GC point. | |
4872
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7141200: log some interesting information in ring buffers for crashes
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|
4041 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
0 | 4042 } |
4043 | |
4044 void Threads::remove(JavaThread* p) { | |
4045 // Extra scope needed for Thread_lock, so we can check | |
4046 // that we do not remove thread without safepoint code notice | |
4047 { MutexLocker ml(Threads_lock); | |
4048 | |
4049 assert(includes(p), "p must be present"); | |
4050 | |
4051 JavaThread* current = _thread_list; | |
4052 JavaThread* prev = NULL; | |
4053 | |
4054 while (current != p) { | |
4055 prev = current; | |
4056 current = current->next(); | |
4057 } | |
4058 | |
4059 if (prev) { | |
4060 prev->set_next(current->next()); | |
4061 } else { | |
4062 _thread_list = p->next(); | |
4063 } | |
4064 _number_of_threads--; | |
4065 oop threadObj = p->threadObj(); | |
4066 bool daemon = true; | |
4067 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
4068 _number_of_non_daemon_threads--; | |
4069 daemon = false; | |
4070 | |
4071 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
4072 // on destroy_vm will wake up. | |
4073 if (number_of_non_daemon_threads() == 1) | |
4074 Threads_lock->notify_all(); | |
4075 } | |
4076 ThreadService::remove_thread(p, daemon); | |
4077 | |
4078 // Make sure that safepoint code disregard this thread. This is needed since | |
4079 // the thread might mess around with locks after this point. This can cause it | |
4080 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
4081 // of this thread since it is removed from the queue. | |
4082 p->set_terminated_value(); | |
6197 | 4083 |
4084 // Now, this thread is not visible to safepoint | |
4085 p->set_safepoint_visible(false); | |
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
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6872
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changeset
|
4086 // once the thread becomes safepoint invisible, we can not use its per-thread |
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
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changeset
|
4087 // recorder. And Threads::do_threads() no longer walks this thread, so we have |
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
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diff
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|
4088 // to release its per-thread recorder here. |
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7199092: NMT: NMT needs to deal overlapped virtual memory ranges
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changeset
|
4089 MemTracker::thread_exiting(p); |
0 | 4090 } // unlock Threads_lock |
4091 | |
4092 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
4872
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7141200: log some interesting information in ring buffers for crashes
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parents:
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diff
changeset
|
4093 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
0 | 4094 } |
4095 | |
4096 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
4097 bool Threads::includes(JavaThread* p) { | |
4098 assert(Threads_lock->is_locked(), "sanity check"); | |
4099 ALL_JAVA_THREADS(q) { | |
4100 if (q == p ) { | |
4101 return true; | |
4102 } | |
4103 } | |
4104 return false; | |
4105 } | |
4106 | |
4107 // Operations on the Threads list for GC. These are not explicitly locked, | |
4108 // but the garbage collector must provide a safe context for them to run. | |
4109 // In particular, these things should never be called when the Threads_lock | |
4110 // is held by some other thread. (Note: the Safepoint abstraction also | |
14309 | 4111 // uses the Threads_lock to guarantee this property. It also makes sure that |
0 | 4112 // all threads gets blocked when exiting or starting). |
4113 | |
14483
be0ac0e8f6e7
8035393: Use CLDClosure instead of CLDToOopClosure in frame::oops_interpreted_do
stefank
parents:
14314
diff
changeset
|
4114 void Threads::oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf) { |
0 | 4115 ALL_JAVA_THREADS(p) { |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
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7177
diff
changeset
|
4116 p->oops_do(f, cld_f, cf); |
0 | 4117 } |
7179
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8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
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diff
changeset
|
4118 VMThread::vm_thread()->oops_do(f, cld_f, cf); |
0 | 4119 } |
4120 | |
14483
be0ac0e8f6e7
8035393: Use CLDClosure instead of CLDToOopClosure in frame::oops_interpreted_do
stefank
parents:
14314
diff
changeset
|
4121 void Threads::possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf) { |
0 | 4122 // Introduce a mechanism allowing parallel threads to claim threads as |
4123 // root groups. Overhead should be small enough to use all the time, | |
4124 // even in sequential code. | |
4125 SharedHeap* sh = SharedHeap::heap(); | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
4126 // Cannot yet substitute active_workers for n_par_threads |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
4127 // because of G1CollectedHeap::verify() use of |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4128 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
changeset
|
4129 // turn off parallelism in process_strong_roots while active_workers |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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parents:
4042
diff
changeset
|
4130 // is being used for parallelism elsewhere. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
4131 bool is_par = sh->n_par_threads() > 0; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
4132 assert(!is_par || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
4133 (SharedHeap::heap()->n_par_threads() == |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
4134 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
0 | 4135 int cp = SharedHeap::heap()->strong_roots_parity(); |
4136 ALL_JAVA_THREADS(p) { | |
4137 if (p->claim_oops_do(is_par, cp)) { | |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
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7177
diff
changeset
|
4138 p->oops_do(f, cld_f, cf); |
0 | 4139 } |
4140 } | |
4141 VMThread* vmt = VMThread::vm_thread(); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3938
diff
changeset
|
4142 if (vmt->claim_oops_do(is_par, cp)) { |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
4143 vmt->oops_do(f, cld_f, cf); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3938
diff
changeset
|
4144 } |
0 | 4145 } |
4146 | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
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7615
diff
changeset
|
4147 #if INCLUDE_ALL_GCS |
0 | 4148 // Used by ParallelScavenge |
4149 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
4150 ALL_JAVA_THREADS(p) { | |
4151 q->enqueue(new ThreadRootsTask(p)); | |
4152 } | |
4153 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
4154 } | |
4155 | |
4156 // Used by Parallel Old | |
4157 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
4158 ALL_JAVA_THREADS(p) { | |
4159 q->enqueue(new ThreadRootsMarkingTask(p)); | |
4160 } | |
4161 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
4162 } | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
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diff
changeset
|
4163 #endif // INCLUDE_ALL_GCS |
0 | 4164 |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4165 void Threads::nmethods_do(CodeBlobClosure* cf) { |
0 | 4166 ALL_JAVA_THREADS(p) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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diff
changeset
|
4167 p->nmethods_do(cf); |
0 | 4168 } |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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844
diff
changeset
|
4169 VMThread::vm_thread()->nmethods_do(cf); |
0 | 4170 } |
4171 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
4172 void Threads::metadata_do(void f(Metadata*)) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
4173 ALL_JAVA_THREADS(p) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4174 p->metadata_do(f); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4175 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
changeset
|
4176 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
4177 |
0 | 4178 void Threads::gc_epilogue() { |
4179 ALL_JAVA_THREADS(p) { | |
4180 p->gc_epilogue(); | |
4181 } | |
4182 } | |
4183 | |
4184 void Threads::gc_prologue() { | |
4185 ALL_JAVA_THREADS(p) { | |
4186 p->gc_prologue(); | |
4187 } | |
4188 } | |
4189 | |
4190 void Threads::deoptimized_wrt_marked_nmethods() { | |
4191 ALL_JAVA_THREADS(p) { | |
4192 p->deoptimized_wrt_marked_nmethods(); | |
4193 } | |
4194 } | |
4195 | |
4196 | |
4197 // Get count Java threads that are waiting to enter the specified monitor. | |
4198 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
4199 address monitor, bool doLock) { | |
4200 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
4201 "must grab Threads_lock or be at safepoint"); | |
4202 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
4203 | |
4204 int i = 0; | |
4205 { | |
4206 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4207 ALL_JAVA_THREADS(p) { | |
4208 if (p->is_Compiler_thread()) continue; | |
4209 | |
4210 address pending = (address)p->current_pending_monitor(); | |
4211 if (pending == monitor) { // found a match | |
4212 if (i < count) result->append(p); // save the first count matches | |
4213 i++; | |
4214 } | |
4215 } | |
4216 } | |
4217 return result; | |
4218 } | |
4219 | |
4220 | |
4221 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
4222 assert(doLock || | |
4223 Threads_lock->owned_by_self() || | |
4224 SafepointSynchronize::is_at_safepoint(), | |
4225 "must grab Threads_lock or be at safepoint"); | |
4226 | |
4227 // NULL owner means not locked so we can skip the search | |
4228 if (owner == NULL) return NULL; | |
4229 | |
4230 { | |
4231 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4232 ALL_JAVA_THREADS(p) { | |
4233 // first, see if owner is the address of a Java thread | |
4234 if (owner == (address)p) return p; | |
4235 } | |
4236 } | |
8673
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4237 // Cannot assert on lack of success here since this function may be |
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4238 // used by code that is trying to report useful problem information |
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4239 // like deadlock detection. |
0 | 4240 if (UseHeavyMonitors) return NULL; |
4241 | |
4242 // | |
4243 // If we didn't find a matching Java thread and we didn't force use of | |
4244 // heavyweight monitors, then the owner is the stack address of the | |
4245 // Lock Word in the owning Java thread's stack. | |
4246 // | |
4247 JavaThread* the_owner = NULL; | |
4248 { | |
4249 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4250 ALL_JAVA_THREADS(q) { | |
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4251 if (q->is_lock_owned(owner)) { |
0 | 4252 the_owner = q; |
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4253 break; |
0 | 4254 } |
4255 } | |
4256 } | |
8673
5ee250974db9
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8041
diff
changeset
|
4257 // cannot assert on lack of success here; see above comment |
0 | 4258 return the_owner; |
4259 } | |
4260 | |
4261 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
4262 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
4263 char buf[32]; | |
4264 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
4265 | |
4266 st->print_cr("Full thread dump %s (%s %s):", | |
4267 Abstract_VM_Version::vm_name(), | |
4268 Abstract_VM_Version::vm_release(), | |
4269 Abstract_VM_Version::vm_info_string() | |
4270 ); | |
4271 st->cr(); | |
4272 | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4273 #if INCLUDE_ALL_GCS |
0 | 4274 // Dump concurrent locks |
4275 ConcurrentLocksDump concurrent_locks; | |
4276 if (print_concurrent_locks) { | |
4277 concurrent_locks.dump_at_safepoint(); | |
4278 } | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4279 #endif // INCLUDE_ALL_GCS |
0 | 4280 |
4281 ALL_JAVA_THREADS(p) { | |
4282 ResourceMark rm; | |
4283 p->print_on(st); | |
4284 if (print_stacks) { | |
4285 if (internal_format) { | |
4286 p->trace_stack(); | |
4287 } else { | |
4288 p->print_stack_on(st); | |
4289 } | |
4290 } | |
4291 st->cr(); | |
8001
db9981fd3124
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jprovino
parents:
7615
diff
changeset
|
4292 #if INCLUDE_ALL_GCS |
0 | 4293 if (print_concurrent_locks) { |
4294 concurrent_locks.print_locks_on(p, st); | |
4295 } | |
8001
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parents:
7615
diff
changeset
|
4296 #endif // INCLUDE_ALL_GCS |
0 | 4297 } |
4298 | |
4299 VMThread::vm_thread()->print_on(st); | |
4300 st->cr(); | |
4301 Universe::heap()->print_gc_threads_on(st); | |
4302 WatcherThread* wt = WatcherThread::watcher_thread(); | |
6766 | 4303 if (wt != NULL) { |
4304 wt->print_on(st); | |
4305 st->cr(); | |
4306 } | |
0 | 4307 CompileBroker::print_compiler_threads_on(st); |
4308 st->flush(); | |
4309 } | |
4310 | |
4311 // Threads::print_on_error() is called by fatal error handler. It's possible | |
4312 // that VM is not at safepoint and/or current thread is inside signal handler. | |
4313 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
4314 // memory (even in resource area), it might deadlock the error handler. | |
4315 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
4316 bool found_current = false; | |
4317 st->print_cr("Java Threads: ( => current thread )"); | |
4318 ALL_JAVA_THREADS(thread) { | |
4319 bool is_current = (current == thread); | |
4320 found_current = found_current || is_current; | |
4321 | |
4322 st->print("%s", is_current ? "=>" : " "); | |
4323 | |
4324 st->print(PTR_FORMAT, thread); | |
4325 st->print(" "); | |
4326 thread->print_on_error(st, buf, buflen); | |
4327 st->cr(); | |
4328 } | |
4329 st->cr(); | |
4330 | |
4331 st->print_cr("Other Threads:"); | |
4332 if (VMThread::vm_thread()) { | |
4333 bool is_current = (current == VMThread::vm_thread()); | |
4334 found_current = found_current || is_current; | |
4335 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
4336 | |
4337 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
4338 st->print(" "); | |
4339 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
4340 st->cr(); | |
4341 } | |
4342 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4343 if (wt != NULL) { | |
4344 bool is_current = (current == wt); | |
4345 found_current = found_current || is_current; | |
4346 st->print("%s", is_current ? "=>" : " "); | |
4347 | |
4348 st->print(PTR_FORMAT, wt); | |
4349 st->print(" "); | |
4350 wt->print_on_error(st, buf, buflen); | |
4351 st->cr(); | |
4352 } | |
4353 if (!found_current) { | |
4354 st->cr(); | |
4355 st->print("=>" PTR_FORMAT " (exited) ", current); | |
4356 current->print_on_error(st, buf, buflen); | |
4357 st->cr(); | |
4358 } | |
4359 } | |
4360 | |
1878 | 4361 // Internal SpinLock and Mutex |
4362 // Based on ParkEvent | |
4363 | |
4364 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
0 | 4365 // |
1878 | 4366 // We employ SpinLocks _only for low-contention, fixed-length |
4367 // short-duration critical sections where we're concerned | |
4368 // about native mutex_t or HotSpot Mutex:: latency. | |
4369 // The mux construct provides a spin-then-block mutual exclusion | |
4370 // mechanism. | |
4371 // | |
4372 // Testing has shown that contention on the ListLock guarding gFreeList | |
4373 // is common. If we implement ListLock as a simple SpinLock it's common | |
4374 // for the JVM to devolve to yielding with little progress. This is true | |
4375 // despite the fact that the critical sections protected by ListLock are | |
4376 // extremely short. | |
0 | 4377 // |
1878 | 4378 // TODO-FIXME: ListLock should be of type SpinLock. |
4379 // We should make this a 1st-class type, integrated into the lock | |
4380 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
4381 // should have sufficient padding to avoid false-sharing and excessive | |
4382 // cache-coherency traffic. | |
4383 | |
4384 | |
4385 typedef volatile int SpinLockT ; | |
4386 | |
4387 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
4388 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
4389 return ; // normal fast-path return | |
4390 } | |
4391 | |
4392 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
4393 TEVENT (SpinAcquire - ctx) ; | |
4394 int ctr = 0 ; | |
4395 int Yields = 0 ; | |
0 | 4396 for (;;) { |
1878 | 4397 while (*adr != 0) { |
4398 ++ctr ; | |
4399 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
4400 if (Yields > 5) { | |
14291
5944dba4badc
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dsimms
parents:
14179
diff
changeset
|
4401 os::naked_short_sleep(1); |
1878 | 4402 } else { |
4403 os::NakedYield() ; | |
4404 ++Yields ; | |
4405 } | |
4406 } else { | |
4407 SpinPause() ; | |
0 | 4408 } |
1878 | 4409 } |
4410 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
0 | 4411 } |
4412 } | |
4413 | |
1878 | 4414 void Thread::SpinRelease (volatile int * adr) { |
4415 assert (*adr != 0, "invariant") ; | |
4416 OrderAccess::fence() ; // guarantee at least release consistency. | |
4417 // Roach-motel semantics. | |
4418 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
4419 // but prior LDs and STs within the critical section can't be allowed | |
4420 // to reorder or float past the ST that releases the lock. | |
4421 *adr = 0 ; | |
0 | 4422 } |
4423 | |
1878 | 4424 // muxAcquire and muxRelease: |
4425 // | |
4426 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
4427 // The LSB of the word is set IFF the lock is held. | |
4428 // The remainder of the word points to the head of a singly-linked list | |
4429 // of threads blocked on the lock. | |
4430 // | |
4431 // * The current implementation of muxAcquire-muxRelease uses its own | |
4432 // dedicated Thread._MuxEvent instance. If we're interested in | |
4433 // minimizing the peak number of extant ParkEvent instances then | |
4434 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
4435 // as certain invariants were satisfied. Specifically, care would need | |
4436 // to be taken with regards to consuming unpark() "permits". | |
4437 // A safe rule of thumb is that a thread would never call muxAcquire() | |
4438 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
4439 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
4440 // consume an unpark() permit intended for monitorenter, for instance. | |
4441 // One way around this would be to widen the restricted-range semaphore | |
4442 // implemented in park(). Another alternative would be to provide | |
4443 // multiple instances of the PlatformEvent() for each thread. One | |
4444 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
4445 // | |
4446 // * Usage: | |
4447 // -- Only as leaf locks | |
4448 // -- for short-term locking only as muxAcquire does not perform | |
4449 // thread state transitions. | |
4450 // | |
4451 // Alternatives: | |
4452 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
4453 // but with parking or spin-then-park instead of pure spinning. | |
4454 // * Use Taura-Oyama-Yonenzawa locks. | |
4455 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
4456 // (List,LockByte). Acquire will CAS the full lockword while Release | |
4457 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
4458 // acquiring threads use timers (ParkTimed) to detect and recover from | |
4459 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
4460 // boundaries by using placement-new. | |
4461 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
4462 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
4463 // The validity of the backlinks must be ratified before we trust the value. | |
4464 // If the backlinks are invalid the exiting thread must back-track through the | |
4465 // the forward links, which are always trustworthy. | |
4466 // * Add a successor indication. The LockWord is currently encoded as | |
4467 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
4468 // to provide the usual futile-wakeup optimization. | |
4469 // See RTStt for details. | |
4470 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
4471 // | |
4472 | |
4473 | |
4474 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
4475 enum MuxBits { LOCKBIT = 1 } ; | |
4476 | |
4477 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
4478 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4479 if (w == 0) return ; | |
4480 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4481 return ; | |
4482 } | |
4483 | |
4484 TEVENT (muxAcquire - Contention) ; | |
4485 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
4486 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
0 | 4487 for (;;) { |
1878 | 4488 int its = (os::is_MP() ? 100 : 0) + 1 ; |
4489 | |
4490 // Optional spin phase: spin-then-park strategy | |
4491 while (--its >= 0) { | |
4492 w = *Lock ; | |
4493 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4494 return ; | |
4495 } | |
4496 } | |
4497 | |
4498 Self->reset() ; | |
4499 Self->OnList = intptr_t(Lock) ; | |
4500 // The following fence() isn't _strictly necessary as the subsequent | |
4501 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4502 OrderAccess::fence(); | |
4503 for (;;) { | |
4504 w = *Lock ; | |
4505 if ((w & LOCKBIT) == 0) { | |
4506 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4507 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
4508 return ; | |
4509 } | |
4510 continue ; // Interference -- *Lock changed -- Just retry | |
0 | 4511 } |
1878 | 4512 assert (w & LOCKBIT, "invariant") ; |
4513 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4514 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
4515 } | |
4516 | |
4517 while (Self->OnList != 0) { | |
4518 Self->park() ; | |
4519 } | |
0 | 4520 } |
4521 } | |
4522 | |
1878 | 4523 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
4524 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4525 if (w == 0) return ; | |
4526 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4527 return ; | |
4528 } | |
4529 | |
4530 TEVENT (muxAcquire - Contention) ; | |
4531 ParkEvent * ReleaseAfter = NULL ; | |
4532 if (ev == NULL) { | |
4533 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
4534 } | |
4535 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
4536 for (;;) { | |
4537 guarantee (ev->OnList == 0, "invariant") ; | |
4538 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
4539 | |
4540 // Optional spin phase: spin-then-park strategy | |
4541 while (--its >= 0) { | |
4542 w = *Lock ; | |
4543 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4544 if (ReleaseAfter != NULL) { | |
4545 ParkEvent::Release (ReleaseAfter) ; | |
4546 } | |
4547 return ; | |
4548 } | |
4549 } | |
4550 | |
4551 ev->reset() ; | |
4552 ev->OnList = intptr_t(Lock) ; | |
4553 // The following fence() isn't _strictly necessary as the subsequent | |
4554 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4555 OrderAccess::fence(); | |
4556 for (;;) { | |
4557 w = *Lock ; | |
4558 if ((w & LOCKBIT) == 0) { | |
4559 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4560 ev->OnList = 0 ; | |
4561 // We call ::Release while holding the outer lock, thus | |
4562 // artificially lengthening the critical section. | |
4563 // Consider deferring the ::Release() until the subsequent unlock(), | |
4564 // after we've dropped the outer lock. | |
4565 if (ReleaseAfter != NULL) { | |
4566 ParkEvent::Release (ReleaseAfter) ; | |
4567 } | |
4568 return ; | |
4569 } | |
4570 continue ; // Interference -- *Lock changed -- Just retry | |
4571 } | |
4572 assert (w & LOCKBIT, "invariant") ; | |
4573 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4574 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
4575 } | |
4576 | |
4577 while (ev->OnList != 0) { | |
4578 ev->park() ; | |
4579 } | |
4580 } | |
4581 } | |
4582 | |
4583 // Release() must extract a successor from the list and then wake that thread. | |
4584 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
4585 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
4586 // Release() would : | |
4587 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
4588 // (B) Extract a successor from the private list "in-hand" | |
4589 // (C) attempt to CAS() the residual back into *Lock over null. | |
4590 // If there were any newly arrived threads and the CAS() would fail. | |
4591 // In that case Release() would detach the RATs, re-merge the list in-hand | |
4592 // with the RATs and repeat as needed. Alternately, Release() might | |
4593 // detach and extract a successor, but then pass the residual list to the wakee. | |
4594 // The wakee would be responsible for reattaching and remerging before it | |
4595 // competed for the lock. | |
4596 // | |
4597 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
4598 // multiple concurrent pushers, but only one popper or detacher. | |
4599 // This implementation pops from the head of the list. This is unfair, | |
4600 // but tends to provide excellent throughput as hot threads remain hot. | |
4601 // (We wake recently run threads first). | |
4602 | |
4603 void Thread::muxRelease (volatile intptr_t * Lock) { | |
4604 for (;;) { | |
4605 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
4606 assert (w & LOCKBIT, "invariant") ; | |
4607 if (w == LOCKBIT) return ; | |
4608 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
4609 assert (List != NULL, "invariant") ; | |
4610 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
4611 ParkEvent * nxt = List->ListNext ; | |
4612 | |
4613 // The following CAS() releases the lock and pops the head element. | |
4614 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
4615 continue ; | |
4616 } | |
4617 List->OnList = 0 ; | |
4618 OrderAccess::fence() ; | |
4619 List->unpark () ; | |
4620 return ; | |
4621 } | |
4622 } | |
4623 | |
4624 | |
0 | 4625 void Threads::verify() { |
4626 ALL_JAVA_THREADS(p) { | |
4627 p->verify(); | |
4628 } | |
4629 VMThread* thread = VMThread::vm_thread(); | |
4630 if (thread != NULL) thread->verify(); | |
4631 } |