Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/thread.cpp @ 8002:8391fdd36e1f
Merge
author | dlong |
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date | Sun, 27 Jan 2013 01:07:09 -0800 |
parents | db9981fd3124 |
children | 3c9bc17b9403 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "code/scopeDesc.hpp" | |
31 #include "compiler/compileBroker.hpp" | |
32 #include "interpreter/interpreter.hpp" | |
33 #include "interpreter/linkResolver.hpp" | |
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34 #include "interpreter/oopMapCache.hpp" |
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35 #include "jvmtifiles/jvmtiEnv.hpp" |
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36 #include "memory/gcLocker.inline.hpp" |
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37 #include "memory/metaspaceShared.hpp" |
1972 | 38 #include "memory/oopFactory.hpp" |
39 #include "memory/universe.inline.hpp" | |
40 #include "oops/instanceKlass.hpp" | |
41 #include "oops/objArrayOop.hpp" | |
42 #include "oops/oop.inline.hpp" | |
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43 #include "oops/symbol.hpp" |
1972 | 44 #include "prims/jvm_misc.hpp" |
45 #include "prims/jvmtiExport.hpp" | |
46 #include "prims/jvmtiThreadState.hpp" | |
47 #include "prims/privilegedStack.hpp" | |
48 #include "runtime/aprofiler.hpp" | |
49 #include "runtime/arguments.hpp" | |
50 #include "runtime/biasedLocking.hpp" | |
51 #include "runtime/deoptimization.hpp" | |
52 #include "runtime/fprofiler.hpp" | |
53 #include "runtime/frame.inline.hpp" | |
54 #include "runtime/init.hpp" | |
55 #include "runtime/interfaceSupport.hpp" | |
56 #include "runtime/java.hpp" | |
57 #include "runtime/javaCalls.hpp" | |
58 #include "runtime/jniPeriodicChecker.hpp" | |
59 #include "runtime/memprofiler.hpp" | |
60 #include "runtime/mutexLocker.hpp" | |
61 #include "runtime/objectMonitor.hpp" | |
62 #include "runtime/osThread.hpp" | |
63 #include "runtime/safepoint.hpp" | |
64 #include "runtime/sharedRuntime.hpp" | |
65 #include "runtime/statSampler.hpp" | |
66 #include "runtime/stubRoutines.hpp" | |
67 #include "runtime/task.hpp" | |
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68 #include "runtime/thread.inline.hpp" |
1972 | 69 #include "runtime/threadCritical.hpp" |
70 #include "runtime/threadLocalStorage.hpp" | |
71 #include "runtime/vframe.hpp" | |
72 #include "runtime/vframeArray.hpp" | |
73 #include "runtime/vframe_hp.hpp" | |
74 #include "runtime/vmThread.hpp" | |
75 #include "runtime/vm_operations.hpp" | |
76 #include "services/attachListener.hpp" | |
77 #include "services/management.hpp" | |
6197 | 78 #include "services/memTracker.hpp" |
1972 | 79 #include "services/threadService.hpp" |
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80 #include "trace/traceEventTypes.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 | |
4006 | 115 #ifndef USDT2 |
0 | 116 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
117 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
118 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
119 intptr_t, intptr_t, bool); | |
120 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
121 intptr_t, intptr_t, bool); | |
122 | |
123 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
124 { \ | |
125 ResourceMark rm(this); \ | |
126 int len = 0; \ | |
127 const char* name = (javathread)->get_thread_name(); \ | |
128 len = strlen(name); \ | |
129 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
130 name, len, \ | |
131 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
132 (javathread)->osthread()->thread_id(), \ | |
133 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
134 } | |
135 | |
4006 | 136 #else /* USDT2 */ |
137 | |
138 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
139 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
140 | |
141 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
142 { \ | |
143 ResourceMark rm(this); \ | |
144 int len = 0; \ | |
145 const char* name = (javathread)->get_thread_name(); \ | |
146 len = strlen(name); \ | |
147 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
148 (char *) name, len, \ | |
149 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
150 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
151 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
152 } | |
153 | |
154 #endif /* USDT2 */ | |
155 | |
0 | 156 #else // ndef DTRACE_ENABLED |
157 | |
158 #define DTRACE_THREAD_PROBE(probe, javathread) | |
159 | |
160 #endif // ndef DTRACE_ENABLED | |
161 | |
6197 | 162 |
0 | 163 // Class hierarchy |
164 // - Thread | |
165 // - VMThread | |
166 // - WatcherThread | |
167 // - ConcurrentMarkSweepThread | |
168 // - JavaThread | |
169 // - CompilerThread | |
170 | |
171 // ======= Thread ======== | |
172 // Support for forcing alignment of thread objects for biased locking | |
6197 | 173 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
0 | 174 if (UseBiasedLocking) { |
175 const int alignment = markOopDesc::biased_lock_alignment; | |
176 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
6197 | 177 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
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178 : AllocateHeap(aligned_size, flags, CURRENT_PC, |
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179 AllocFailStrategy::RETURN_NULL); |
0 | 180 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
181 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
182 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
183 "JavaThread alignment code overflowed allocated storage"); | |
184 if (TraceBiasedLocking) { | |
185 if (aligned_addr != real_malloc_addr) | |
186 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
187 real_malloc_addr, aligned_addr); | |
188 } | |
189 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
190 return aligned_addr; | |
191 } else { | |
6197 | 192 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
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193 : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL); |
0 | 194 } |
195 } | |
196 | |
197 void Thread::operator delete(void* p) { | |
198 if (UseBiasedLocking) { | |
199 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
6197 | 200 FreeHeap(real_malloc_addr, mtThread); |
0 | 201 } else { |
6197 | 202 FreeHeap(p, mtThread); |
0 | 203 } |
204 } | |
205 | |
206 | |
207 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
208 // JavaThread | |
209 | |
210 | |
211 Thread::Thread() { | |
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212 // stack and get_thread |
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213 set_stack_base(NULL); |
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214 set_stack_size(0); |
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215 set_self_raw_id(0); |
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216 set_lgrp_id(-1); |
0 | 217 |
218 // allocated data structures | |
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219 set_osthread(NULL); |
6197 | 220 set_resource_area(new (mtThread)ResourceArea()); |
221 set_handle_area(new (mtThread) HandleArea(NULL)); | |
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222 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(300, true)); |
0 | 223 set_active_handles(NULL); |
224 set_free_handle_block(NULL); | |
225 set_last_handle_mark(NULL); | |
226 | |
227 // This initial value ==> never claimed. | |
228 _oops_do_parity = 0; | |
229 | |
230 // the handle mark links itself to last_handle_mark | |
231 new HandleMark(this); | |
232 | |
233 // plain initialization | |
234 debug_only(_owned_locks = NULL;) | |
235 debug_only(_allow_allocation_count = 0;) | |
236 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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237 NOT_PRODUCT(_skip_gcalot = false;) |
0 | 238 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
239 _jvmti_env_iteration_count = 0; | |
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240 set_allocated_bytes(0); |
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241 set_trace_buffer(NULL); |
0 | 242 _vm_operation_started_count = 0; |
243 _vm_operation_completed_count = 0; | |
244 _current_pending_monitor = NULL; | |
245 _current_pending_monitor_is_from_java = true; | |
246 _current_waiting_monitor = NULL; | |
247 _num_nested_signal = 0; | |
248 omFreeList = NULL ; | |
249 omFreeCount = 0 ; | |
250 omFreeProvision = 32 ; | |
1587 | 251 omInUseList = NULL ; |
252 omInUseCount = 0 ; | |
0 | 253 |
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254 #ifdef ASSERT |
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255 _visited_for_critical_count = false; |
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256 #endif |
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257 |
0 | 258 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
259 _suspend_flags = 0; | |
260 | |
261 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
262 _hashStateX = os::random() ; | |
263 _hashStateY = 842502087 ; | |
264 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
265 _hashStateW = 273326509 ; | |
266 | |
267 _OnTrap = 0 ; | |
268 _schedctl = NULL ; | |
269 _Stalled = 0 ; | |
270 _TypeTag = 0x2BAD ; | |
271 | |
272 // Many of the following fields are effectively final - immutable | |
273 // Note that nascent threads can't use the Native Monitor-Mutex | |
274 // construct until the _MutexEvent is initialized ... | |
275 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
276 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
277 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
278 // and ::Release() | |
279 _ParkEvent = ParkEvent::Allocate (this) ; | |
280 _SleepEvent = ParkEvent::Allocate (this) ; | |
281 _MutexEvent = ParkEvent::Allocate (this) ; | |
282 _MuxEvent = ParkEvent::Allocate (this) ; | |
283 | |
284 #ifdef CHECK_UNHANDLED_OOPS | |
285 if (CheckUnhandledOops) { | |
286 _unhandled_oops = new UnhandledOops(this); | |
287 } | |
288 #endif // CHECK_UNHANDLED_OOPS | |
289 #ifdef ASSERT | |
290 if (UseBiasedLocking) { | |
291 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
292 assert(this == _real_malloc_address || | |
293 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
294 "bug in forced alignment of thread objects"); | |
295 } | |
296 #endif /* ASSERT */ | |
297 } | |
298 | |
299 void Thread::initialize_thread_local_storage() { | |
300 // Note: Make sure this method only calls | |
301 // non-blocking operations. Otherwise, it might not work | |
302 // with the thread-startup/safepoint interaction. | |
303 | |
304 // During Java thread startup, safepoint code should allow this | |
305 // method to complete because it may need to allocate memory to | |
306 // store information for the new thread. | |
307 | |
308 // initialize structure dependent on thread local storage | |
309 ThreadLocalStorage::set_thread(this); | |
310 } | |
311 | |
312 void Thread::record_stack_base_and_size() { | |
313 set_stack_base(os::current_stack_base()); | |
314 set_stack_size(os::current_stack_size()); | |
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315 // CR 7190089: on Solaris, primordial thread's stack is adjusted |
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316 // in initialize_thread(). Without the adjustment, stack size is |
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317 // incorrect if stack is set to unlimited (ulimit -s unlimited). |
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318 // So far, only Solaris has real implementation of initialize_thread(). |
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319 // |
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320 // set up any platform-specific state. |
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321 os::initialize_thread(this); |
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322 |
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323 #if INCLUDE_NMT |
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324 // record thread's native stack, stack grows downward |
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325 address stack_low_addr = stack_base() - stack_size(); |
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326 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, |
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327 CURRENT_PC); |
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328 #endif // INCLUDE_NMT |
0 | 329 } |
330 | |
331 | |
332 Thread::~Thread() { | |
333 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
334 ObjectSynchronizer::omFlush (this) ; | |
335 | |
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336 // stack_base can be NULL if the thread is never started or exited before |
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337 // record_stack_base_and_size called. Although, we would like to ensure |
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338 // that all started threads do call record_stack_base_and_size(), there is |
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339 // not proper way to enforce that. |
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340 #if INCLUDE_NMT |
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341 if (_stack_base != NULL) { |
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342 address low_stack_addr = stack_base() - stack_size(); |
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343 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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344 #ifdef ASSERT |
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345 set_stack_base(NULL); |
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346 #endif |
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347 } |
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348 #endif // INCLUDE_NMT |
6197 | 349 |
0 | 350 // deallocate data structures |
351 delete resource_area(); | |
352 // since the handle marks are using the handle area, we have to deallocated the root | |
353 // handle mark before deallocating the thread's handle area, | |
354 assert(last_handle_mark() != NULL, "check we have an element"); | |
355 delete last_handle_mark(); | |
356 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
357 | |
358 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
359 // We NULL out the fields for good hygiene. | |
360 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
361 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
362 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
363 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
364 | |
365 delete handle_area(); | |
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366 delete metadata_handles(); |
0 | 367 |
368 // osthread() can be NULL, if creation of thread failed. | |
369 if (osthread() != NULL) os::free_thread(osthread()); | |
370 | |
371 delete _SR_lock; | |
372 | |
373 // clear thread local storage if the Thread is deleting itself | |
374 if (this == Thread::current()) { | |
375 ThreadLocalStorage::set_thread(NULL); | |
376 } else { | |
377 // In the case where we're not the current thread, invalidate all the | |
378 // caches in case some code tries to get the current thread or the | |
379 // thread that was destroyed, and gets stale information. | |
380 ThreadLocalStorage::invalidate_all(); | |
381 } | |
382 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
383 } | |
384 | |
385 // NOTE: dummy function for assertion purpose. | |
386 void Thread::run() { | |
387 ShouldNotReachHere(); | |
388 } | |
389 | |
390 #ifdef ASSERT | |
391 // Private method to check for dangling thread pointer | |
392 void check_for_dangling_thread_pointer(Thread *thread) { | |
393 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
394 "possibility of dangling Thread pointer"); | |
395 } | |
396 #endif | |
397 | |
398 | |
399 #ifndef PRODUCT | |
400 // Tracing method for basic thread operations | |
401 void Thread::trace(const char* msg, const Thread* const thread) { | |
402 if (!TraceThreadEvents) return; | |
403 ResourceMark rm; | |
404 ThreadCritical tc; | |
405 const char *name = "non-Java thread"; | |
406 int prio = -1; | |
407 if (thread->is_Java_thread() | |
408 && !thread->is_Compiler_thread()) { | |
409 // The Threads_lock must be held to get information about | |
410 // this thread but may not be in some situations when | |
411 // tracing thread events. | |
412 bool release_Threads_lock = false; | |
413 if (!Threads_lock->owned_by_self()) { | |
414 Threads_lock->lock(); | |
415 release_Threads_lock = true; | |
416 } | |
417 JavaThread* jt = (JavaThread *)thread; | |
418 name = (char *)jt->get_thread_name(); | |
419 oop thread_oop = jt->threadObj(); | |
420 if (thread_oop != NULL) { | |
421 prio = java_lang_Thread::priority(thread_oop); | |
422 } | |
423 if (release_Threads_lock) { | |
424 Threads_lock->unlock(); | |
425 } | |
426 } | |
427 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
428 } | |
429 #endif | |
430 | |
431 | |
432 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
433 trace("get priority", thread); | |
434 ThreadPriority priority; | |
435 // Can return an error! | |
436 (void)os::get_priority(thread, priority); | |
437 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
438 return priority; | |
439 } | |
440 | |
441 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
442 trace("set priority", thread); | |
443 debug_only(check_for_dangling_thread_pointer(thread);) | |
444 // Can return an error! | |
445 (void)os::set_priority(thread, priority); | |
446 } | |
447 | |
448 | |
449 void Thread::start(Thread* thread) { | |
450 trace("start", thread); | |
451 // Start is different from resume in that its safety is guaranteed by context or | |
452 // being called from a Java method synchronized on the Thread object. | |
453 if (!DisableStartThread) { | |
454 if (thread->is_Java_thread()) { | |
455 // Initialize the thread state to RUNNABLE before starting this thread. | |
456 // Can not set it after the thread started because we do not know the | |
457 // exact thread state at that time. It could be in MONITOR_WAIT or | |
458 // in SLEEPING or some other state. | |
459 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
460 java_lang_Thread::RUNNABLE); | |
461 } | |
462 os::start_thread(thread); | |
463 } | |
464 } | |
465 | |
466 // Enqueue a VM_Operation to do the job for us - sometime later | |
467 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
468 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
469 VMThread::execute(vm_stop); | |
470 } | |
471 | |
472 | |
473 // | |
474 // Check if an external suspend request has completed (or has been | |
475 // cancelled). Returns true if the thread is externally suspended and | |
476 // false otherwise. | |
477 // | |
478 // The bits parameter returns information about the code path through | |
479 // the routine. Useful for debugging: | |
480 // | |
481 // set in is_ext_suspend_completed(): | |
482 // 0x00000001 - routine was entered | |
483 // 0x00000010 - routine return false at end | |
484 // 0x00000100 - thread exited (return false) | |
485 // 0x00000200 - suspend request cancelled (return false) | |
486 // 0x00000400 - thread suspended (return true) | |
487 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
488 // 0x00002000 - thread is native and walkable (return true) | |
489 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
490 // | |
491 // set in wait_for_ext_suspend_completion(): | |
492 // 0x00010000 - routine was entered | |
493 // 0x00020000 - suspend request cancelled before loop (return false) | |
494 // 0x00040000 - thread suspended before loop (return true) | |
495 // 0x00080000 - suspend request cancelled in loop (return false) | |
496 // 0x00100000 - thread suspended in loop (return true) | |
497 // 0x00200000 - suspend not completed during retry loop (return false) | |
498 // | |
499 | |
500 // Helper class for tracing suspend wait debug bits. | |
501 // | |
502 // 0x00000100 indicates that the target thread exited before it could | |
503 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
504 // 0x00080000 each indicate a cancelled suspend request so they don't | |
505 // count as wait failures either. | |
506 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
507 | |
508 class TraceSuspendDebugBits : public StackObj { | |
509 private: | |
510 JavaThread * jt; | |
511 bool is_wait; | |
512 bool called_by_wait; // meaningful when !is_wait | |
513 uint32_t * bits; | |
514 | |
515 public: | |
516 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
517 uint32_t *_bits) { | |
518 jt = _jt; | |
519 is_wait = _is_wait; | |
520 called_by_wait = _called_by_wait; | |
521 bits = _bits; | |
522 } | |
523 | |
524 ~TraceSuspendDebugBits() { | |
525 if (!is_wait) { | |
526 #if 1 | |
527 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
528 // That trace is very chatty. | |
529 return; | |
530 #else | |
531 if (!called_by_wait) { | |
532 // If tracing for is_ext_suspend_completed() is enabled, then only | |
533 // trace calls to it from wait_for_ext_suspend_completion() | |
534 return; | |
535 } | |
536 #endif | |
537 } | |
538 | |
539 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
540 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
541 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
542 ResourceMark rm; | |
543 | |
544 tty->print_cr( | |
545 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
546 jt->get_thread_name(), *bits); | |
547 | |
548 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
549 } | |
550 } | |
551 } | |
552 }; | |
553 #undef DEBUG_FALSE_BITS | |
554 | |
555 | |
556 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
557 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
558 | |
559 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
560 bool do_trans_retry; // flag to force the retry | |
561 | |
562 *bits |= 0x00000001; | |
563 | |
564 do { | |
565 do_trans_retry = false; | |
566 | |
567 if (is_exiting()) { | |
568 // Thread is in the process of exiting. This is always checked | |
569 // first to reduce the risk of dereferencing a freed JavaThread. | |
570 *bits |= 0x00000100; | |
571 return false; | |
572 } | |
573 | |
574 if (!is_external_suspend()) { | |
575 // Suspend request is cancelled. This is always checked before | |
576 // is_ext_suspended() to reduce the risk of a rogue resume | |
577 // confusing the thread that made the suspend request. | |
578 *bits |= 0x00000200; | |
579 return false; | |
580 } | |
581 | |
582 if (is_ext_suspended()) { | |
583 // thread is suspended | |
584 *bits |= 0x00000400; | |
585 return true; | |
586 } | |
587 | |
588 // Now that we no longer do hard suspends of threads running | |
589 // native code, the target thread can be changing thread state | |
590 // while we are in this routine: | |
591 // | |
592 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
593 // | |
594 // We save a copy of the thread state as observed at this moment | |
595 // and make our decision about suspend completeness based on the | |
596 // copy. This closes the race where the thread state is seen as | |
597 // _thread_in_native_trans in the if-thread_blocked check, but is | |
598 // seen as _thread_blocked in if-thread_in_native_trans check. | |
599 JavaThreadState save_state = thread_state(); | |
600 | |
601 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
602 // If the thread's state is _thread_blocked and this blocking | |
603 // condition is known to be equivalent to a suspend, then we can | |
604 // consider the thread to be externally suspended. This means that | |
605 // the code that sets _thread_blocked has been modified to do | |
606 // self-suspension if the blocking condition releases. We also | |
607 // used to check for CONDVAR_WAIT here, but that is now covered by | |
608 // the _thread_blocked with self-suspension check. | |
609 // | |
610 // Return true since we wouldn't be here unless there was still an | |
611 // external suspend request. | |
612 *bits |= 0x00001000; | |
613 return true; | |
614 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
615 // Threads running native code will self-suspend on native==>VM/Java | |
616 // transitions. If its stack is walkable (should always be the case | |
617 // unless this function is called before the actual java_suspend() | |
618 // call), then the wait is done. | |
619 *bits |= 0x00002000; | |
620 return true; | |
621 } else if (!called_by_wait && !did_trans_retry && | |
622 save_state == _thread_in_native_trans && | |
623 frame_anchor()->walkable()) { | |
624 // The thread is transitioning from thread_in_native to another | |
625 // thread state. check_safepoint_and_suspend_for_native_trans() | |
626 // will force the thread to self-suspend. If it hasn't gotten | |
627 // there yet we may have caught the thread in-between the native | |
628 // code check above and the self-suspend. Lucky us. If we were | |
629 // called by wait_for_ext_suspend_completion(), then it | |
630 // will be doing the retries so we don't have to. | |
631 // | |
632 // Since we use the saved thread state in the if-statement above, | |
633 // there is a chance that the thread has already transitioned to | |
634 // _thread_blocked by the time we get here. In that case, we will | |
635 // make a single unnecessary pass through the logic below. This | |
636 // doesn't hurt anything since we still do the trans retry. | |
637 | |
638 *bits |= 0x00004000; | |
639 | |
640 // Once the thread leaves thread_in_native_trans for another | |
641 // thread state, we break out of this retry loop. We shouldn't | |
642 // need this flag to prevent us from getting back here, but | |
643 // sometimes paranoia is good. | |
644 did_trans_retry = true; | |
645 | |
646 // We wait for the thread to transition to a more usable state. | |
647 for (int i = 1; i <= SuspendRetryCount; i++) { | |
648 // We used to do an "os::yield_all(i)" call here with the intention | |
649 // that yielding would increase on each retry. However, the parameter | |
650 // is ignored on Linux which means the yield didn't scale up. Waiting | |
651 // on the SR_lock below provides a much more predictable scale up for | |
652 // the delay. It also provides a simple/direct point to check for any | |
653 // safepoint requests from the VMThread | |
654 | |
655 // temporarily drops SR_lock while doing wait with safepoint check | |
656 // (if we're a JavaThread - the WatcherThread can also call this) | |
657 // and increase delay with each retry | |
658 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
659 | |
660 // check the actual thread state instead of what we saved above | |
661 if (thread_state() != _thread_in_native_trans) { | |
662 // the thread has transitioned to another thread state so | |
663 // try all the checks (except this one) one more time. | |
664 do_trans_retry = true; | |
665 break; | |
666 } | |
667 } // end retry loop | |
668 | |
669 | |
670 } | |
671 } while (do_trans_retry); | |
672 | |
673 *bits |= 0x00000010; | |
674 return false; | |
675 } | |
676 | |
677 // | |
678 // Wait for an external suspend request to complete (or be cancelled). | |
679 // Returns true if the thread is externally suspended and false otherwise. | |
680 // | |
681 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
682 uint32_t *bits) { | |
683 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
684 false /* !called_by_wait */, bits); | |
685 | |
686 // local flag copies to minimize SR_lock hold time | |
687 bool is_suspended; | |
688 bool pending; | |
689 uint32_t reset_bits; | |
690 | |
691 // set a marker so is_ext_suspend_completed() knows we are the caller | |
692 *bits |= 0x00010000; | |
693 | |
694 // We use reset_bits to reinitialize the bits value at the top of | |
695 // each retry loop. This allows the caller to make use of any | |
696 // unused bits for their own marking purposes. | |
697 reset_bits = *bits; | |
698 | |
699 { | |
700 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
701 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
702 delay, bits); | |
703 pending = is_external_suspend(); | |
704 } | |
705 // must release SR_lock to allow suspension to complete | |
706 | |
707 if (!pending) { | |
708 // A cancelled suspend request is the only false return from | |
709 // is_ext_suspend_completed() that keeps us from entering the | |
710 // retry loop. | |
711 *bits |= 0x00020000; | |
712 return false; | |
713 } | |
714 | |
715 if (is_suspended) { | |
716 *bits |= 0x00040000; | |
717 return true; | |
718 } | |
719 | |
720 for (int i = 1; i <= retries; i++) { | |
721 *bits = reset_bits; // reinit to only track last retry | |
722 | |
723 // We used to do an "os::yield_all(i)" call here with the intention | |
724 // that yielding would increase on each retry. However, the parameter | |
725 // is ignored on Linux which means the yield didn't scale up. Waiting | |
726 // on the SR_lock below provides a much more predictable scale up for | |
727 // the delay. It also provides a simple/direct point to check for any | |
728 // safepoint requests from the VMThread | |
729 | |
730 { | |
731 MutexLocker ml(SR_lock()); | |
732 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
733 // can also call this) and increase delay with each retry | |
734 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
735 | |
736 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
737 delay, bits); | |
738 | |
739 // It is possible for the external suspend request to be cancelled | |
740 // (by a resume) before the actual suspend operation is completed. | |
741 // Refresh our local copy to see if we still need to wait. | |
742 pending = is_external_suspend(); | |
743 } | |
744 | |
745 if (!pending) { | |
746 // A cancelled suspend request is the only false return from | |
747 // is_ext_suspend_completed() that keeps us from staying in the | |
748 // retry loop. | |
749 *bits |= 0x00080000; | |
750 return false; | |
751 } | |
752 | |
753 if (is_suspended) { | |
754 *bits |= 0x00100000; | |
755 return true; | |
756 } | |
757 } // end retry loop | |
758 | |
759 // thread did not suspend after all our retries | |
760 *bits |= 0x00200000; | |
761 return false; | |
762 } | |
763 | |
764 #ifndef PRODUCT | |
765 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
766 | |
767 // This should not need to be atomic as the only way for simultaneous | |
768 // updates is via interrupts. Even then this should be rare or non-existant | |
769 // and we don't care that much anyway. | |
770 | |
771 int index = _jmp_ring_index; | |
772 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
773 _jmp_ring[index]._target = (intptr_t) target; | |
774 _jmp_ring[index]._instruction = (intptr_t) instr; | |
775 _jmp_ring[index]._file = file; | |
776 _jmp_ring[index]._line = line; | |
777 } | |
778 #endif /* PRODUCT */ | |
779 | |
780 // Called by flat profiler | |
781 // Callers have already called wait_for_ext_suspend_completion | |
782 // The assertion for that is currently too complex to put here: | |
783 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
784 bool gotframe = false; | |
785 // self suspension saves needed state. | |
786 if (has_last_Java_frame() && _anchor.walkable()) { | |
787 *_fr = pd_last_frame(); | |
788 gotframe = true; | |
789 } | |
790 return gotframe; | |
791 } | |
792 | |
793 void Thread::interrupt(Thread* thread) { | |
794 trace("interrupt", thread); | |
795 debug_only(check_for_dangling_thread_pointer(thread);) | |
796 os::interrupt(thread); | |
797 } | |
798 | |
799 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
800 trace("is_interrupted", thread); | |
801 debug_only(check_for_dangling_thread_pointer(thread);) | |
802 // Note: If clear_interrupted==false, this simply fetches and | |
803 // returns the value of the field osthread()->interrupted(). | |
804 return os::is_interrupted(thread, clear_interrupted); | |
805 } | |
806 | |
807 | |
808 // GC Support | |
809 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
810 jint thread_parity = _oops_do_parity; | |
811 if (thread_parity != strong_roots_parity) { | |
812 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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813 if (res == thread_parity) { |
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814 return true; |
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815 } else { |
0 | 816 guarantee(res == strong_roots_parity, "Or else what?"); |
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817 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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818 "Should only fail when parallel."); |
0 | 819 return false; |
820 } | |
821 } | |
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822 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
0 | 823 "Should only fail when parallel."); |
824 return false; | |
825 } | |
826 | |
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827 void Thread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
0 | 828 active_handles()->oops_do(f); |
829 // Do oop for ThreadShadow | |
830 f->do_oop((oop*)&_pending_exception); | |
831 handle_area()->oops_do(f); | |
832 } | |
833 | |
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834 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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835 // no nmethods in a generic thread... |
0 | 836 } |
837 | |
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838 void Thread::metadata_do(void f(Metadata*)) { |
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839 if (metadata_handles() != NULL) { |
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840 for (int i = 0; i< metadata_handles()->length(); i++) { |
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841 f(metadata_handles()->at(i)); |
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842 } |
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843 } |
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844 } |
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845 |
0 | 846 void Thread::print_on(outputStream* st) const { |
847 // get_priority assumes osthread initialized | |
848 if (osthread() != NULL) { | |
6766 | 849 int os_prio; |
850 if (os::get_native_priority(this, &os_prio) == OS_OK) { | |
851 st->print("os_prio=%d ", os_prio); | |
852 } | |
853 st->print("tid=" INTPTR_FORMAT " ", this); | |
0 | 854 osthread()->print_on(st); |
855 } | |
856 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
857 } | |
858 | |
859 // Thread::print_on_error() is called by fatal error handler. Don't use | |
860 // any lock or allocate memory. | |
861 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
862 if (is_VM_thread()) st->print("VMThread"); | |
863 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
864 else if (is_Java_thread()) st->print("JavaThread"); | |
865 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
866 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
867 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
868 else st->print("Thread"); | |
869 | |
870 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
871 _stack_base - _stack_size, _stack_base); | |
872 | |
873 if (osthread()) { | |
874 st->print(" [id=%d]", osthread()->thread_id()); | |
875 } | |
876 } | |
877 | |
878 #ifdef ASSERT | |
879 void Thread::print_owned_locks_on(outputStream* st) const { | |
880 Monitor *cur = _owned_locks; | |
881 if (cur == NULL) { | |
882 st->print(" (no locks) "); | |
883 } else { | |
884 st->print_cr(" Locks owned:"); | |
885 while(cur) { | |
886 cur->print_on(st); | |
887 cur = cur->next(); | |
888 } | |
889 } | |
890 } | |
891 | |
892 static int ref_use_count = 0; | |
893 | |
894 bool Thread::owns_locks_but_compiled_lock() const { | |
895 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
896 if (cur != Compile_lock) return true; | |
897 } | |
898 return false; | |
899 } | |
900 | |
901 | |
902 #endif | |
903 | |
904 #ifndef PRODUCT | |
905 | |
906 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
907 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
908 // no threads which allow_vm_block's are held | |
909 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
910 // Check if current thread is allowed to block at a safepoint | |
911 if (!(_allow_safepoint_count == 0)) | |
912 fatal("Possible safepoint reached by thread that does not allow it"); | |
913 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
914 fatal("LEAF method calling lock?"); | |
915 } | |
916 | |
917 #ifdef ASSERT | |
918 if (potential_vm_operation && is_Java_thread() | |
919 && !Universe::is_bootstrapping()) { | |
920 // Make sure we do not hold any locks that the VM thread also uses. | |
921 // This could potentially lead to deadlocks | |
922 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
923 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
924 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
925 // since it is used to transfer control between JavaThreads and the VMThread | |
926 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
927 if ( (cur->allow_vm_block() && | |
928 cur != Threads_lock && | |
929 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
930 cur != VMOperationRequest_lock && | |
931 cur != VMOperationQueue_lock) || | |
932 cur->rank() == Mutex::special) { | |
933 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
934 } | |
935 } | |
936 } | |
937 | |
938 if (GCALotAtAllSafepoints) { | |
939 // We could enter a safepoint here and thus have a gc | |
940 InterfaceSupport::check_gc_alot(); | |
941 } | |
942 #endif | |
943 } | |
944 #endif | |
945 | |
946 bool Thread::is_in_stack(address adr) const { | |
947 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
948 address end = os::current_stack_pointer(); | |
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949 // Allow non Java threads to call this without stack_base |
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950 if (_stack_base == NULL) return true; |
0 | 951 if (stack_base() >= adr && adr >= end) return true; |
952 | |
953 return false; | |
954 } | |
955 | |
956 | |
957 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
958 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
959 // used for compilation in the future. If that change is made, the need for these methods | |
960 // should be revisited, and they should be removed if possible. | |
961 | |
962 bool Thread::is_lock_owned(address adr) const { | |
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963 return on_local_stack(adr); |
0 | 964 } |
965 | |
966 bool Thread::set_as_starting_thread() { | |
967 // NOTE: this must be called inside the main thread. | |
968 return os::create_main_thread((JavaThread*)this); | |
969 } | |
970 | |
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971 static void initialize_class(Symbol* class_name, TRAPS) { |
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972 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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973 InstanceKlass::cast(klass)->initialize(CHECK); |
0 | 974 } |
975 | |
976 | |
977 // Creates the initial ThreadGroup | |
978 static Handle create_initial_thread_group(TRAPS) { | |
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979 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
0 | 980 instanceKlassHandle klass (THREAD, k); |
981 | |
982 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
983 { | |
984 JavaValue result(T_VOID); | |
985 JavaCalls::call_special(&result, | |
986 system_instance, | |
987 klass, | |
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988 vmSymbols::object_initializer_name(), |
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989 vmSymbols::void_method_signature(), |
0 | 990 CHECK_NH); |
991 } | |
992 Universe::set_system_thread_group(system_instance()); | |
993 | |
994 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
995 { | |
996 JavaValue result(T_VOID); | |
997 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
998 JavaCalls::call_special(&result, | |
999 main_instance, | |
1000 klass, | |
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1001 vmSymbols::object_initializer_name(), |
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1002 vmSymbols::threadgroup_string_void_signature(), |
0 | 1003 system_instance, |
1004 string, | |
1005 CHECK_NH); | |
1006 } | |
1007 return main_instance; | |
1008 } | |
1009 | |
1010 // Creates the initial Thread | |
1011 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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1012 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
0 | 1013 instanceKlassHandle klass (THREAD, k); |
1014 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
1015 | |
1016 java_lang_Thread::set_thread(thread_oop(), thread); | |
1017 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1018 thread->set_threadObj(thread_oop()); | |
1019 | |
1020 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
1021 | |
1022 JavaValue result(T_VOID); | |
1023 JavaCalls::call_special(&result, thread_oop, | |
1024 klass, | |
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1025 vmSymbols::object_initializer_name(), |
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1026 vmSymbols::threadgroup_string_void_signature(), |
0 | 1027 thread_group, |
1028 string, | |
1029 CHECK_NULL); | |
1030 return thread_oop(); | |
1031 } | |
1032 | |
1033 static void call_initializeSystemClass(TRAPS) { | |
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1034 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1035 instanceKlassHandle klass (THREAD, k); |
1036 | |
1037 JavaValue result(T_VOID); | |
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1038 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1039 vmSymbols::void_method_signature(), CHECK); |
0 | 1040 } |
1041 | |
6181 | 1042 char java_runtime_name[128] = ""; |
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1043 char java_runtime_version[128] = ""; |
6181 | 1044 |
1045 // extract the JRE name from sun.misc.Version.java_runtime_name | |
1046 static const char* get_java_runtime_name(TRAPS) { | |
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1047 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
6181 | 1048 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
1049 fieldDescriptor fd; | |
1050 bool found = k != NULL && | |
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1051 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
6181 | 1052 vmSymbols::string_signature(), &fd); |
1053 if (found) { | |
1054 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
1055 if (name_oop == NULL) | |
1056 return NULL; | |
1057 const char* name = java_lang_String::as_utf8_string(name_oop, | |
1058 java_runtime_name, | |
1059 sizeof(java_runtime_name)); | |
1060 return name; | |
1061 } else { | |
1062 return NULL; | |
1063 } | |
1064 } | |
1065 | |
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1066 // extract the JRE version from sun.misc.Version.java_runtime_version |
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1067 static const char* get_java_runtime_version(TRAPS) { |
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1068 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
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1069 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
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1070 fieldDescriptor fd; |
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1071 bool found = k != NULL && |
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1072 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_version_name(), |
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1073 vmSymbols::string_signature(), &fd); |
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1074 if (found) { |
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1075 oop name_oop = k->java_mirror()->obj_field(fd.offset()); |
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1076 if (name_oop == NULL) |
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1077 return NULL; |
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1078 const char* name = java_lang_String::as_utf8_string(name_oop, |
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1079 java_runtime_version, |
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1080 sizeof(java_runtime_version)); |
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1081 return name; |
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1082 } else { |
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1083 return NULL; |
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1084 } |
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1085 } |
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1086 |
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1087 // General purpose hook into Java code, run once when the VM is initialized. |
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1088 // The Java library method itself may be changed independently from the VM. |
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1089 static void call_postVMInitHook(TRAPS) { |
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1090 Klass* k = SystemDictionary::PostVMInitHook_klass(); |
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1091 instanceKlassHandle klass (THREAD, k); |
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1092 if (klass.not_null()) { |
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1093 JavaValue result(T_VOID); |
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1094 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1095 vmSymbols::void_method_signature(), |
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1096 CHECK); |
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1097 } |
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1098 } |
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1099 |
0 | 1100 static void reset_vm_info_property(TRAPS) { |
1101 // the vm info string | |
1102 ResourceMark rm(THREAD); | |
1103 const char *vm_info = VM_Version::vm_info_string(); | |
1104 | |
1105 // java.lang.System class | |
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1106 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1107 instanceKlassHandle klass (THREAD, k); |
1108 | |
1109 // setProperty arguments | |
1110 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
1111 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
1112 | |
1113 // return value | |
1114 JavaValue r(T_OBJECT); | |
1115 | |
1116 // public static String setProperty(String key, String value); | |
1117 JavaCalls::call_static(&r, | |
1118 klass, | |
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1119 vmSymbols::setProperty_name(), |
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1120 vmSymbols::string_string_string_signature(), |
0 | 1121 key_str, |
1122 value_str, | |
1123 CHECK); | |
1124 } | |
1125 | |
1126 | |
1127 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
1128 assert(thread_group.not_null(), "thread group should be specified"); | |
1129 assert(threadObj() == NULL, "should only create Java thread object once"); | |
1130 | |
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1131 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 1132 instanceKlassHandle klass (THREAD, k); |
1133 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
1134 | |
1135 java_lang_Thread::set_thread(thread_oop(), this); | |
1136 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1137 set_threadObj(thread_oop()); | |
1138 | |
1139 JavaValue result(T_VOID); | |
1140 if (thread_name != NULL) { | |
1141 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
1142 // Thread gets assigned specified name and null target | |
1143 JavaCalls::call_special(&result, | |
1144 thread_oop, | |
1145 klass, | |
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1146 vmSymbols::object_initializer_name(), |
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1147 vmSymbols::threadgroup_string_void_signature(), |
0 | 1148 thread_group, // Argument 1 |
1149 name, // Argument 2 | |
1150 THREAD); | |
1151 } else { | |
1152 // Thread gets assigned name "Thread-nnn" and null target | |
1153 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
1154 JavaCalls::call_special(&result, | |
1155 thread_oop, | |
1156 klass, | |
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1157 vmSymbols::object_initializer_name(), |
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1158 vmSymbols::threadgroup_runnable_void_signature(), |
0 | 1159 thread_group, // Argument 1 |
1160 Handle(), // Argument 2 | |
1161 THREAD); | |
1162 } | |
1163 | |
1164 | |
1165 if (daemon) { | |
1166 java_lang_Thread::set_daemon(thread_oop()); | |
1167 } | |
1168 | |
1169 if (HAS_PENDING_EXCEPTION) { | |
1170 return; | |
1171 } | |
1172 | |
1142 | 1173 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
0 | 1174 Handle threadObj(this, this->threadObj()); |
1175 | |
1176 JavaCalls::call_special(&result, | |
1177 thread_group, | |
1178 group, | |
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1179 vmSymbols::add_method_name(), |
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1180 vmSymbols::thread_void_signature(), |
0 | 1181 threadObj, // Arg 1 |
1182 THREAD); | |
1183 | |
1184 | |
1185 } | |
1186 | |
1187 // NamedThread -- non-JavaThread subclasses with multiple | |
1188 // uniquely named instances should derive from this. | |
1189 NamedThread::NamedThread() : Thread() { | |
1190 _name = NULL; | |
1119
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1191 _processed_thread = NULL; |
0 | 1192 } |
1193 | |
1194 NamedThread::~NamedThread() { | |
1195 if (_name != NULL) { | |
6197 | 1196 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
0 | 1197 _name = NULL; |
1198 } | |
1199 } | |
1200 | |
1201 void NamedThread::set_name(const char* format, ...) { | |
1202 guarantee(_name == NULL, "Only get to set name once."); | |
6197 | 1203 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
0 | 1204 guarantee(_name != NULL, "alloc failure"); |
1205 va_list ap; | |
1206 va_start(ap, format); | |
1207 jio_vsnprintf(_name, max_name_len, format, ap); | |
1208 va_end(ap); | |
1209 } | |
1210 | |
1211 // ======= WatcherThread ======== | |
1212 | |
1213 // The watcher thread exists to simulate timer interrupts. It should | |
1214 // be replaced by an abstraction over whatever native support for | |
1215 // timer interrupts exists on the platform. | |
1216 | |
1217 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
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1218 bool WatcherThread::_startable = false; |
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1219 volatile bool WatcherThread::_should_terminate = false; |
0 | 1220 |
1221 WatcherThread::WatcherThread() : Thread() { | |
1222 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
1223 if (os::create_thread(this, os::watcher_thread)) { | |
1224 _watcher_thread = this; | |
1225 | |
1226 // Set the watcher thread to the highest OS priority which should not be | |
1227 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1228 // is created. The only normal thread using this priority is the reference | |
1229 // handler thread, which runs for very short intervals only. | |
1230 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1231 // will be inaccurate. | |
1232 os::set_priority(this, MaxPriority); | |
1233 if (!DisableStartThread) { | |
1234 os::start_thread(this); | |
1235 } | |
1236 } | |
1237 } | |
1238 | |
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1239 int WatcherThread::sleep() const { |
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1240 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1241 |
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1242 // remaining will be zero if there are no tasks, |
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1243 // causing the WatcherThread to sleep until a task is |
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1244 // enrolled |
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1245 int remaining = PeriodicTask::time_to_wait(); |
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1246 int time_slept = 0; |
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1247 |
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1248 // we expect this to timeout - we only ever get unparked when |
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1249 // we should terminate or when a new task has been enrolled |
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1250 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1251 |
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1252 jlong time_before_loop = os::javaTimeNanos(); |
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1253 |
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1254 for (;;) { |
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1255 bool timedout = PeriodicTask_lock->wait(Mutex::_no_safepoint_check_flag, remaining); |
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1256 jlong now = os::javaTimeNanos(); |
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1257 |
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1258 if (remaining == 0) { |
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1259 // if we didn't have any tasks we could have waited for a long time |
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1260 // consider the time_slept zero and reset time_before_loop |
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1261 time_slept = 0; |
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1262 time_before_loop = now; |
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1263 } else { |
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1264 // need to recalulate since we might have new tasks in _tasks |
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1265 time_slept = (int) ((now - time_before_loop) / 1000000); |
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1266 } |
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1267 |
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1268 // Change to task list or spurious wakeup of some kind |
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1269 if (timedout || _should_terminate) { |
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1270 break; |
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1271 } |
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1272 |
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1273 remaining = PeriodicTask::time_to_wait(); |
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1274 if (remaining == 0) { |
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1275 // Last task was just disenrolled so loop around and wait until |
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1276 // another task gets enrolled |
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1277 continue; |
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1278 } |
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1279 |
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1280 remaining -= time_slept; |
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1281 if (remaining <= 0) |
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1282 break; |
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1283 } |
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1284 |
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1285 return time_slept; |
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1286 } |
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1287 |
0 | 1288 void WatcherThread::run() { |
1289 assert(this == watcher_thread(), "just checking"); | |
1290 | |
1291 this->record_stack_base_and_size(); | |
1292 this->initialize_thread_local_storage(); | |
1293 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1294 while(!_should_terminate) { | |
1295 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1296 assert(watcher_thread() == this, "thread consistency check"); | |
1297 | |
1298 // Calculate how long it'll be until the next PeriodicTask work | |
1299 // should be done, and sleep that amount of time. | |
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1300 int time_waited = sleep(); |
0 | 1301 |
1302 if (is_error_reported()) { | |
1303 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1304 // should abort JVM after creating an error log file. However in some | |
1305 // rare cases, the error handler itself might deadlock. Here we try to | |
1306 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1307 // | |
1308 // This code is in WatcherThread because WatcherThread wakes up | |
1309 // periodically so the fatal error handler doesn't need to do anything; | |
1310 // also because the WatcherThread is less likely to crash than other | |
1311 // threads. | |
1312 | |
1313 for (;;) { | |
1314 if (!ShowMessageBoxOnError | |
1315 && (OnError == NULL || OnError[0] == '\0') | |
1316 && Arguments::abort_hook() == NULL) { | |
1317 os::sleep(this, 2 * 60 * 1000, false); | |
1318 fdStream err(defaultStream::output_fd()); | |
1319 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1320 // skip atexit/vm_exit/vm_abort hooks | |
1321 os::die(); | |
1322 } | |
1323 | |
1324 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1325 // ShowMessageBoxOnError when it is ready to abort. | |
1326 os::sleep(this, 5 * 1000, false); | |
1327 } | |
1328 } | |
1329 | |
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1330 PeriodicTask::real_time_tick(time_waited); |
0 | 1331 } |
1332 | |
1333 // Signal that it is terminated | |
1334 { | |
1335 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1336 _watcher_thread = NULL; | |
1337 Terminator_lock->notify(); | |
1338 } | |
1339 | |
1340 // Thread destructor usually does this.. | |
1341 ThreadLocalStorage::set_thread(NULL); | |
1342 } | |
1343 | |
1344 void WatcherThread::start() { | |
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1345 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1346 |
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1347 if (watcher_thread() == NULL && _startable) { |
0 | 1348 _should_terminate = false; |
1349 // Create the single instance of WatcherThread | |
1350 new WatcherThread(); | |
1351 } | |
1352 } | |
1353 | |
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1354 void WatcherThread::make_startable() { |
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1355 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1356 _startable = true; |
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1357 } |
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1358 |
0 | 1359 void WatcherThread::stop() { |
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1360 { |
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1361 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1362 _should_terminate = true; |
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1363 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1364 |
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1365 WatcherThread* watcher = watcher_thread(); |
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1366 if (watcher != NULL) |
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1367 watcher->unpark(); |
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1368 } |
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1369 |
0 | 1370 // it is ok to take late safepoints here, if needed |
1371 MutexLocker mu(Terminator_lock); | |
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1372 |
0 | 1373 while(watcher_thread() != NULL) { |
1374 // This wait should make safepoint checks, wait without a timeout, | |
1375 // and wait as a suspend-equivalent condition. | |
1376 // | |
1377 // Note: If the FlatProfiler is running, then this thread is waiting | |
1378 // for the WatcherThread to terminate and the WatcherThread, via the | |
1379 // FlatProfiler task, is waiting for the external suspend request on | |
1380 // this thread to complete. wait_for_ext_suspend_completion() will | |
1381 // eventually timeout, but that takes time. Making this wait a | |
1382 // suspend-equivalent condition solves that timeout problem. | |
1383 // | |
1384 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1385 Mutex::_as_suspend_equivalent_flag); | |
1386 } | |
1387 } | |
1388 | |
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1389 void WatcherThread::unpark() { |
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1390 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1391 PeriodicTask_lock->notify(); |
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1392 } |
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1393 |
0 | 1394 void WatcherThread::print_on(outputStream* st) const { |
1395 st->print("\"%s\" ", name()); | |
1396 Thread::print_on(st); | |
1397 st->cr(); | |
1398 } | |
1399 | |
1400 // ======= JavaThread ======== | |
1401 | |
1402 // A JavaThread is a normal Java thread | |
1403 | |
1404 void JavaThread::initialize() { | |
1405 // Initialize fields | |
342
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1406 |
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1407 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1408 set_claimed_par_id(-1); |
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1409 |
0 | 1410 set_saved_exception_pc(NULL); |
1411 set_threadObj(NULL); | |
1412 _anchor.clear(); | |
1413 set_entry_point(NULL); | |
1414 set_jni_functions(jni_functions()); | |
1415 set_callee_target(NULL); | |
1416 set_vm_result(NULL); | |
1417 set_vm_result_2(NULL); | |
1418 set_vframe_array_head(NULL); | |
1419 set_vframe_array_last(NULL); | |
1420 set_deferred_locals(NULL); | |
1421 set_deopt_mark(NULL); | |
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1422 set_deopt_nmethod(NULL); |
0 | 1423 clear_must_deopt_id(); |
1424 set_monitor_chunks(NULL); | |
1425 set_next(NULL); | |
1426 set_thread_state(_thread_new); | |
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1427 #if INCLUDE_NMT |
6197 | 1428 set_recorder(NULL); |
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1429 #endif |
0 | 1430 _terminated = _not_terminated; |
1431 _privileged_stack_top = NULL; | |
1432 _array_for_gc = NULL; | |
1433 _suspend_equivalent = false; | |
1434 _in_deopt_handler = 0; | |
1435 _doing_unsafe_access = false; | |
1436 _stack_guard_state = stack_guard_unused; | |
1437 _exception_oop = NULL; | |
1438 _exception_pc = 0; | |
1439 _exception_handler_pc = 0; | |
1903 | 1440 _is_method_handle_return = 0; |
0 | 1441 _jvmti_thread_state= NULL; |
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1442 _should_post_on_exceptions_flag = JNI_FALSE; |
0 | 1443 _jvmti_get_loaded_classes_closure = NULL; |
1444 _interp_only_mode = 0; | |
1445 _special_runtime_exit_condition = _no_async_condition; | |
1446 _pending_async_exception = NULL; | |
1447 _is_compiling = false; | |
1448 _thread_stat = NULL; | |
1449 _thread_stat = new ThreadStatistics(); | |
1450 _blocked_on_compilation = false; | |
1451 _jni_active_critical = 0; | |
1452 _do_not_unlock_if_synchronized = false; | |
1453 _cached_monitor_info = NULL; | |
1454 _parker = Parker::Allocate(this) ; | |
1455 | |
1456 #ifndef PRODUCT | |
1457 _jmp_ring_index = 0; | |
1458 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1459 record_jump(NULL, NULL, NULL, 0); | |
1460 } | |
1461 #endif /* PRODUCT */ | |
1462 | |
1463 set_thread_profiler(NULL); | |
1464 if (FlatProfiler::is_active()) { | |
1465 // This is where we would decide to either give each thread it's own profiler | |
1466 // or use one global one from FlatProfiler, | |
1467 // or up to some count of the number of profiled threads, etc. | |
1468 ThreadProfiler* pp = new ThreadProfiler(); | |
1469 pp->engage(); | |
1470 set_thread_profiler(pp); | |
1471 } | |
1472 | |
1473 // Setup safepoint state info for this thread | |
1474 ThreadSafepointState::create(this); | |
1475 | |
1476 debug_only(_java_call_counter = 0); | |
1477 | |
1478 // JVMTI PopFrame support | |
1479 _popframe_condition = popframe_inactive; | |
1480 _popframe_preserved_args = NULL; | |
1481 _popframe_preserved_args_size = 0; | |
1482 | |
1483 pd_initialize(); | |
1484 } | |
1485 | |
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1486 #if INCLUDE_ALL_GCS |
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1487 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1488 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1489 #endif // INCLUDE_ALL_GCS |
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1490 |
4006 | 1491 JavaThread::JavaThread(bool is_attaching_via_jni) : |
342
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1492 Thread() |
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1493 #if INCLUDE_ALL_GCS |
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1494 , _satb_mark_queue(&_satb_mark_queue_set), |
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1495 _dirty_card_queue(&_dirty_card_queue_set) |
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1496 #endif // INCLUDE_ALL_GCS |
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1497 { |
0 | 1498 initialize(); |
4006 | 1499 if (is_attaching_via_jni) { |
1500 _jni_attach_state = _attaching_via_jni; | |
1501 } else { | |
1502 _jni_attach_state = _not_attaching_via_jni; | |
1503 } | |
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1504 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
6197 | 1505 _safepoint_visible = false; |
0 | 1506 } |
1507 | |
1508 bool JavaThread::reguard_stack(address cur_sp) { | |
1509 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1510 return true; // Stack already guarded or guard pages not needed. | |
1511 } | |
1512 | |
1513 if (register_stack_overflow()) { | |
1514 // For those architectures which have separate register and | |
1515 // memory stacks, we must check the register stack to see if | |
1516 // it has overflowed. | |
1517 return false; | |
1518 } | |
1519 | |
1520 // Java code never executes within the yellow zone: the latter is only | |
1521 // there to provoke an exception during stack banging. If java code | |
1522 // is executing there, either StackShadowPages should be larger, or | |
1523 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1524 // when it should. | |
1525 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1526 | |
1527 enable_stack_yellow_zone(); | |
1528 return true; | |
1529 } | |
1530 | |
1531 bool JavaThread::reguard_stack(void) { | |
1532 return reguard_stack(os::current_stack_pointer()); | |
1533 } | |
1534 | |
1535 | |
1536 void JavaThread::block_if_vm_exited() { | |
1537 if (_terminated == _vm_exited) { | |
1538 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1539 // we will block here forever | |
1540 Threads_lock->lock_without_safepoint_check(); | |
1541 ShouldNotReachHere(); | |
1542 } | |
1543 } | |
1544 | |
1545 | |
1546 // Remove this ifdef when C1 is ported to the compiler interface. | |
1547 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1548 | |
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1549 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1550 Thread() |
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1551 #if INCLUDE_ALL_GCS |
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1552 , _satb_mark_queue(&_satb_mark_queue_set), |
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1553 _dirty_card_queue(&_dirty_card_queue_set) |
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1554 #endif // INCLUDE_ALL_GCS |
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1555 { |
0 | 1556 if (TraceThreadEvents) { |
1557 tty->print_cr("creating thread %p", this); | |
1558 } | |
1559 initialize(); | |
4006 | 1560 _jni_attach_state = _not_attaching_via_jni; |
0 | 1561 set_entry_point(entry_point); |
1562 // Create the native thread itself. | |
1563 // %note runtime_23 | |
1564 os::ThreadType thr_type = os::java_thread; | |
1565 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1566 os::java_thread; | |
1567 os::create_thread(this, thr_type, stack_sz); | |
6197 | 1568 _safepoint_visible = false; |
0 | 1569 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
1570 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1571 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1572 // the exception consists of creating the exception object & initializing it, initialization | |
1573 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1574 // | |
1575 // The thread is still suspended when we reach here. Thread must be explicit started | |
1576 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1577 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1578 // object must be fully initialized (take a look at JVM_Start) | |
1579 } | |
1580 | |
1581 JavaThread::~JavaThread() { | |
1582 if (TraceThreadEvents) { | |
1583 tty->print_cr("terminate thread %p", this); | |
1584 } | |
1585 | |
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1586 // By now, this thread should already be invisible to safepoint, |
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1587 // and its per-thread recorder also collected. |
6197 | 1588 assert(!is_safepoint_visible(), "wrong state"); |
6882
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1589 #if INCLUDE_NMT |
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1590 assert(get_recorder() == NULL, "Already collected"); |
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1591 #endif // INCLUDE_NMT |
6197 | 1592 |
0 | 1593 // JSR166 -- return the parker to the free list |
1594 Parker::Release(_parker); | |
1595 _parker = NULL ; | |
1596 | |
1597 // Free any remaining previous UnrollBlock | |
1598 vframeArray* old_array = vframe_array_last(); | |
1599 | |
1600 if (old_array != NULL) { | |
1601 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1602 old_array->set_unroll_block(NULL); | |
1603 delete old_info; | |
1604 delete old_array; | |
1605 } | |
1606 | |
1607 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1608 if (deferred != NULL) { | |
1609 // This can only happen if thread is destroyed before deoptimization occurs. | |
1610 assert(deferred->length() != 0, "empty array!"); | |
1611 do { | |
1612 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1613 deferred->remove_at(0); | |
1614 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1615 delete dlv; | |
1616 } while (deferred->length() != 0); | |
1617 delete deferred; | |
1618 } | |
1619 | |
1620 // All Java related clean up happens in exit | |
1621 ThreadSafepointState::destroy(this); | |
1622 if (_thread_profiler != NULL) delete _thread_profiler; | |
1623 if (_thread_stat != NULL) delete _thread_stat; | |
1624 } | |
1625 | |
1626 | |
1627 // The first routine called by a new Java thread | |
1628 void JavaThread::run() { | |
1629 // initialize thread-local alloc buffer related fields | |
1630 this->initialize_tlab(); | |
1631 | |
1632 // used to test validitity of stack trace backs | |
1633 this->record_base_of_stack_pointer(); | |
1634 | |
1635 // Record real stack base and size. | |
1636 this->record_stack_base_and_size(); | |
1637 | |
1638 // Initialize thread local storage; set before calling MutexLocker | |
1639 this->initialize_thread_local_storage(); | |
1640 | |
1641 this->create_stack_guard_pages(); | |
1642 | |
1681
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1643 this->cache_global_variables(); |
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1644 |
0 | 1645 // Thread is now sufficient initialized to be handled by the safepoint code as being |
1646 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1647 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1648 | |
1649 assert(JavaThread::current() == this, "sanity check"); | |
1650 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1651 | |
1652 DTRACE_THREAD_PROBE(start, this); | |
1653 | |
1654 // This operation might block. We call that after all safepoint checks for a new thread has | |
1655 // been completed. | |
1656 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1657 | |
1658 if (JvmtiExport::should_post_thread_life()) { | |
1659 JvmtiExport::post_thread_start(this); | |
1660 } | |
1661 | |
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1662 EVENT_BEGIN(TraceEventThreadStart, event); |
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1663 EVENT_COMMIT(event, |
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1664 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1665 |
0 | 1666 // We call another function to do the rest so we are sure that the stack addresses used |
1667 // from there will be lower than the stack base just computed | |
1668 thread_main_inner(); | |
1669 | |
1670 // Note, thread is no longer valid at this point! | |
1671 } | |
1672 | |
1673 | |
1674 void JavaThread::thread_main_inner() { | |
1675 assert(JavaThread::current() == this, "sanity check"); | |
1676 assert(this->threadObj() != NULL, "just checking"); | |
1677 | |
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1678 // Execute thread entry point unless this thread has a pending exception |
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1679 // or has been stopped before starting. |
0 | 1680 // Note: Due to JVM_StopThread we can have pending exceptions already! |
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1681 if (!this->has_pending_exception() && |
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1682 !java_lang_Thread::is_stillborn(this->threadObj())) { |
4006 | 1683 { |
1684 ResourceMark rm(this); | |
1685 this->set_native_thread_name(this->get_thread_name()); | |
1686 } | |
0 | 1687 HandleMark hm(this); |
1688 this->entry_point()(this, this); | |
1689 } | |
1690 | |
1691 DTRACE_THREAD_PROBE(stop, this); | |
1692 | |
1693 this->exit(false); | |
1694 delete this; | |
1695 } | |
1696 | |
1697 | |
1698 static void ensure_join(JavaThread* thread) { | |
1699 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1700 Handle threadObj(thread, thread->threadObj()); | |
1701 assert(threadObj.not_null(), "java thread object must exist"); | |
1702 ObjectLocker lock(threadObj, thread); | |
1703 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1704 thread->clear_pending_exception(); | |
1705 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1706 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
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1707 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1708 // to complete once we've done the notify_all below |
0 | 1709 java_lang_Thread::set_thread(threadObj(), NULL); |
1710 lock.notify_all(thread); | |
1711 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1712 thread->clear_pending_exception(); | |
1713 } | |
1714 | |
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1715 |
0 | 1716 // For any new cleanup additions, please check to see if they need to be applied to |
1717 // cleanup_failed_attach_current_thread as well. | |
1718 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
1719 assert(this == JavaThread::current(), "thread consistency check"); | |
1720 | |
1721 HandleMark hm(this); | |
1722 Handle uncaught_exception(this, this->pending_exception()); | |
1723 this->clear_pending_exception(); | |
1724 Handle threadObj(this, this->threadObj()); | |
1725 assert(threadObj.not_null(), "Java thread object should be created"); | |
1726 | |
1727 if (get_thread_profiler() != NULL) { | |
1728 get_thread_profiler()->disengage(); | |
1729 ResourceMark rm; | |
1730 get_thread_profiler()->print(get_thread_name()); | |
1731 } | |
1732 | |
1733 | |
1734 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
1735 { | |
1736 EXCEPTION_MARK; | |
1737 | |
1738 CLEAR_PENDING_EXCEPTION; | |
1739 } | |
1740 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
1741 // has to be fixed by a runtime query method | |
1742 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
1743 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
1744 // java.lang.Thread.dispatchUncaughtException | |
1745 if (uncaught_exception.not_null()) { | |
1746 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
1747 { | |
1748 EXCEPTION_MARK; | |
1749 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
1750 // call it. Otherwise we have an older library without the JSR-166 changes, | |
1751 // so call ThreadGroup.uncaughtException() | |
1752 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
1753 CallInfo callinfo; | |
1142 | 1754 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1755 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
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1756 vmSymbols::dispatchUncaughtException_name(), |
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1757 vmSymbols::throwable_void_signature(), |
0 | 1758 KlassHandle(), false, false, THREAD); |
1759 CLEAR_PENDING_EXCEPTION; | |
1760 methodHandle method = callinfo.selected_method(); | |
1761 if (method.not_null()) { | |
1762 JavaValue result(T_VOID); | |
1763 JavaCalls::call_virtual(&result, | |
1764 threadObj, thread_klass, | |
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1765 vmSymbols::dispatchUncaughtException_name(), |
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1766 vmSymbols::throwable_void_signature(), |
0 | 1767 uncaught_exception, |
1768 THREAD); | |
1769 } else { | |
1142 | 1770 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 1771 JavaValue result(T_VOID); |
1772 JavaCalls::call_virtual(&result, | |
1773 group, thread_group, | |
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1774 vmSymbols::uncaughtException_name(), |
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1775 vmSymbols::thread_throwable_void_signature(), |
0 | 1776 threadObj, // Arg 1 |
1777 uncaught_exception, // Arg 2 | |
1778 THREAD); | |
1779 } | |
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1780 if (HAS_PENDING_EXCEPTION) { |
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1781 ResourceMark rm(this); |
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1782 jio_fprintf(defaultStream::error_stream(), |
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1783 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1784 " in thread \"%s\"\n", |
6983 | 1785 pending_exception()->klass()->external_name(), |
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1786 get_thread_name()); |
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1787 CLEAR_PENDING_EXCEPTION; |
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1788 } |
0 | 1789 } |
1790 } | |
1791 | |
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1792 // Called before the java thread exit since we want to read info |
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1793 // from java_lang_Thread object |
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1794 EVENT_BEGIN(TraceEventThreadEnd, event); |
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1795 EVENT_COMMIT(event, |
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1796 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1797 |
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1798 // Call after last event on thread |
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1799 EVENT_THREAD_EXIT(this); |
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1800 |
0 | 1801 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
1802 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1803 // is deprecated anyhow. | |
1804 { int count = 3; | |
1805 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
1806 EXCEPTION_MARK; | |
1807 JavaValue result(T_VOID); | |
1142 | 1808 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1809 JavaCalls::call_virtual(&result, |
1810 threadObj, thread_klass, | |
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1811 vmSymbols::exit_method_name(), |
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1812 vmSymbols::void_method_signature(), |
0 | 1813 THREAD); |
1814 CLEAR_PENDING_EXCEPTION; | |
1815 } | |
1816 } | |
1817 | |
1818 // notify JVMTI | |
1819 if (JvmtiExport::should_post_thread_life()) { | |
1820 JvmtiExport::post_thread_end(this); | |
1821 } | |
1822 | |
1823 // We have notified the agents that we are exiting, before we go on, | |
1824 // we must check for a pending external suspend request and honor it | |
1825 // in order to not surprise the thread that made the suspend request. | |
1826 while (true) { | |
1827 { | |
1828 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1829 if (!is_external_suspend()) { | |
1830 set_terminated(_thread_exiting); | |
1831 ThreadService::current_thread_exiting(this); | |
1832 break; | |
1833 } | |
1834 // Implied else: | |
1835 // Things get a little tricky here. We have a pending external | |
1836 // suspend request, but we are holding the SR_lock so we | |
1837 // can't just self-suspend. So we temporarily drop the lock | |
1838 // and then self-suspend. | |
1839 } | |
1840 | |
1841 ThreadBlockInVM tbivm(this); | |
1842 java_suspend_self(); | |
1843 | |
1844 // We're done with this suspend request, but we have to loop around | |
1845 // and check again. Eventually we will get SR_lock without a pending | |
1846 // external suspend request and will be able to mark ourselves as | |
1847 // exiting. | |
1848 } | |
1849 // no more external suspends are allowed at this point | |
1850 } else { | |
1851 // before_exit() has already posted JVMTI THREAD_END events | |
1852 } | |
1853 | |
1854 // Notify waiters on thread object. This has to be done after exit() is called | |
1855 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1856 // group should have the destroyed bit set before waiters are notified). | |
1857 ensure_join(this); | |
1858 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1859 | |
1860 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1861 // held by this thread must be released. A detach operation must only | |
1862 // get here if there are no Java frames on the stack. Therefore, any | |
1863 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1864 // pre-inflated and in the monitor cache. | |
1865 // | |
1866 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1867 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1868 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1869 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1870 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1871 } | |
1872 | |
1873 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1874 // is in a consistent state, in case GC happens | |
1875 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1876 | |
1877 if (active_handles() != NULL) { | |
1878 JNIHandleBlock* block = active_handles(); | |
1879 set_active_handles(NULL); | |
1880 JNIHandleBlock::release_block(block); | |
1881 } | |
1882 | |
1883 if (free_handle_block() != NULL) { | |
1884 JNIHandleBlock* block = free_handle_block(); | |
1885 set_free_handle_block(NULL); | |
1886 JNIHandleBlock::release_block(block); | |
1887 } | |
1888 | |
1889 // These have to be removed while this is still a valid thread. | |
1890 remove_stack_guard_pages(); | |
1891 | |
1892 if (UseTLAB) { | |
1893 tlab().make_parsable(true); // retire TLAB | |
1894 } | |
1895 | |
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1896 if (JvmtiEnv::environments_might_exist()) { |
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1897 JvmtiExport::cleanup_thread(this); |
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1898 } |
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1899 |
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1900 #if INCLUDE_ALL_GCS |
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1901 // We must flush G1-related buffers before removing a thread from |
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1902 // the list of active threads. |
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1903 if (UseG1GC) { |
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1904 flush_barrier_queues(); |
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1905 } |
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1906 #endif // INCLUDE_ALL_GCS |
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1907 |
0 | 1908 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1909 Threads::remove(this); | |
1910 } | |
1911 | |
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1912 #if INCLUDE_ALL_GCS |
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1913 // Flush G1-related queues. |
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1914 void JavaThread::flush_barrier_queues() { |
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1915 satb_mark_queue().flush(); |
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1916 dirty_card_queue().flush(); |
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1917 } |
1842
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1918 |
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1919 void JavaThread::initialize_queues() { |
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1920 assert(!SafepointSynchronize::is_at_safepoint(), |
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1921 "we should not be at a safepoint"); |
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1922 |
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1923 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1924 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1925 // The SATB queue should have been constructed with its active |
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1926 // field set to false. |
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1927 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1928 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1929 // If we are creating the thread during a marking cycle, we should |
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1930 // set the active field of the SATB queue to true. |
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1931 if (satb_queue_set.is_active()) { |
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1932 satb_queue.set_active(true); |
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1933 } |
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1934 |
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1935 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1936 // The dirty card queue should have been constructed with its |
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1937 // active field set to true. |
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1938 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1939 } |
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1940 #endif // INCLUDE_ALL_GCS |
441
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1941 |
0 | 1942 void JavaThread::cleanup_failed_attach_current_thread() { |
441
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1943 if (get_thread_profiler() != NULL) { |
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1944 get_thread_profiler()->disengage(); |
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1945 ResourceMark rm; |
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1946 get_thread_profiler()->print(get_thread_name()); |
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1947 } |
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1948 |
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1949 if (active_handles() != NULL) { |
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1950 JNIHandleBlock* block = active_handles(); |
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1951 set_active_handles(NULL); |
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1952 JNIHandleBlock::release_block(block); |
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1953 } |
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1954 |
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1955 if (free_handle_block() != NULL) { |
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1956 JNIHandleBlock* block = free_handle_block(); |
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1957 set_free_handle_block(NULL); |
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1958 JNIHandleBlock::release_block(block); |
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1959 } |
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1960 |
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1961 // These have to be removed while this is still a valid thread. |
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1962 remove_stack_guard_pages(); |
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1963 |
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1964 if (UseTLAB) { |
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1965 tlab().make_parsable(true); // retire TLAB, if any |
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1966 } |
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1967 |
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1968 #if INCLUDE_ALL_GCS |
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1969 if (UseG1GC) { |
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1970 flush_barrier_queues(); |
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1971 } |
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1972 #endif // INCLUDE_ALL_GCS |
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1973 |
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1974 Threads::remove(this); |
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1975 delete this; |
0 | 1976 } |
1977 | |
1978 | |
441
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1979 |
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1980 |
0 | 1981 JavaThread* JavaThread::active() { |
1982 Thread* thread = ThreadLocalStorage::thread(); | |
1983 assert(thread != NULL, "just checking"); | |
1984 if (thread->is_Java_thread()) { | |
1985 return (JavaThread*) thread; | |
1986 } else { | |
1987 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
1988 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
1989 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
1990 assert(ret->is_Java_thread(), "must be a Java thread"); | |
1991 return ret; | |
1992 } | |
1993 } | |
1994 | |
1995 bool JavaThread::is_lock_owned(address adr) const { | |
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1996 if (Thread::is_lock_owned(adr)) return true; |
0 | 1997 |
1998 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
1999 if (chunk->contains(adr)) return true; | |
2000 } | |
2001 | |
2002 return false; | |
2003 } | |
2004 | |
2005 | |
2006 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
2007 chunk->set_next(monitor_chunks()); | |
2008 set_monitor_chunks(chunk); | |
2009 } | |
2010 | |
2011 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
2012 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
2013 if (monitor_chunks() == chunk) { | |
2014 set_monitor_chunks(chunk->next()); | |
2015 } else { | |
2016 MonitorChunk* prev = monitor_chunks(); | |
2017 while (prev->next() != chunk) prev = prev->next(); | |
2018 prev->set_next(chunk->next()); | |
2019 } | |
2020 } | |
2021 | |
2022 // JVM support. | |
2023 | |
2024 // Note: this function shouldn't block if it's called in | |
2025 // _thread_in_native_trans state (such as from | |
2026 // check_special_condition_for_native_trans()). | |
2027 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
2028 | |
2029 if (has_last_Java_frame() && has_async_condition()) { | |
2030 // If we are at a polling page safepoint (not a poll return) | |
2031 // then we must defer async exception because live registers | |
2032 // will be clobbered by the exception path. Poll return is | |
2033 // ok because the call we a returning from already collides | |
2034 // with exception handling registers and so there is no issue. | |
2035 // (The exception handling path kills call result registers but | |
2036 // this is ok since the exception kills the result anyway). | |
2037 | |
2038 if (is_at_poll_safepoint()) { | |
2039 // if the code we are returning to has deoptimized we must defer | |
2040 // the exception otherwise live registers get clobbered on the | |
2041 // exception path before deoptimization is able to retrieve them. | |
2042 // | |
2043 RegisterMap map(this, false); | |
2044 frame caller_fr = last_frame().sender(&map); | |
2045 assert(caller_fr.is_compiled_frame(), "what?"); | |
2046 if (caller_fr.is_deoptimized_frame()) { | |
2047 if (TraceExceptions) { | |
2048 ResourceMark rm; | |
2049 tty->print_cr("deferred async exception at compiled safepoint"); | |
2050 } | |
2051 return; | |
2052 } | |
2053 } | |
2054 } | |
2055 | |
2056 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
2057 if (condition == _no_async_condition) { | |
2058 // Conditions have changed since has_special_runtime_exit_condition() | |
2059 // was called: | |
2060 // - if we were here only because of an external suspend request, | |
2061 // then that was taken care of above (or cancelled) so we are done | |
2062 // - if we were here because of another async request, then it has | |
2063 // been cleared between the has_special_runtime_exit_condition() | |
2064 // and now so again we are done | |
2065 return; | |
2066 } | |
2067 | |
2068 // Check for pending async. exception | |
2069 if (_pending_async_exception != NULL) { | |
2070 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1142 | 2071 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2072 |
2073 // We cannot call Exceptions::_throw(...) here because we cannot block | |
2074 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
2075 | |
2076 if (TraceExceptions) { | |
2077 ResourceMark rm; | |
2078 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
2079 if (has_last_Java_frame() ) { | |
2080 frame f = last_frame(); | |
2081 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
2082 } | |
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2083 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2084 } |
2085 _pending_async_exception = NULL; | |
2086 clear_has_async_exception(); | |
2087 } | |
2088 } | |
2089 | |
2090 if (check_unsafe_error && | |
2091 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
2092 condition = _no_async_condition; // done | |
2093 switch (thread_state()) { | |
2094 case _thread_in_vm: | |
2095 { | |
2096 JavaThread* THREAD = this; | |
2097 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2098 } | |
2099 case _thread_in_native: | |
2100 { | |
2101 ThreadInVMfromNative tiv(this); | |
2102 JavaThread* THREAD = this; | |
2103 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2104 } | |
2105 case _thread_in_Java: | |
2106 { | |
2107 ThreadInVMfromJava tiv(this); | |
2108 JavaThread* THREAD = this; | |
2109 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
2110 } | |
2111 default: | |
2112 ShouldNotReachHere(); | |
2113 } | |
2114 } | |
2115 | |
2116 assert(condition == _no_async_condition || has_pending_exception() || | |
2117 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
2118 "must have handled the async condition, if no exception"); | |
2119 } | |
2120 | |
2121 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
2122 // | |
2123 // Check for pending external suspend. Internal suspend requests do | |
2124 // not use handle_special_runtime_exit_condition(). | |
2125 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2126 // thread is not the current thread. In older versions of jdbx, jdbx | |
2127 // threads could call into the VM with another thread's JNIEnv so we | |
2128 // can be here operating on behalf of a suspended thread (4432884). | |
2129 bool do_self_suspend = is_external_suspend_with_lock(); | |
2130 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
2131 // | |
2132 // Because thread is external suspended the safepoint code will count | |
2133 // thread as at a safepoint. This can be odd because we can be here | |
2134 // as _thread_in_Java which would normally transition to _thread_blocked | |
2135 // at a safepoint. We would like to mark the thread as _thread_blocked | |
2136 // before calling java_suspend_self like all other callers of it but | |
2137 // we must then observe proper safepoint protocol. (We can't leave | |
2138 // _thread_blocked with a safepoint in progress). However we can be | |
2139 // here as _thread_in_native_trans so we can't use a normal transition | |
2140 // constructor/destructor pair because they assert on that type of | |
2141 // transition. We could do something like: | |
2142 // | |
2143 // JavaThreadState state = thread_state(); | |
2144 // set_thread_state(_thread_in_vm); | |
2145 // { | |
2146 // ThreadBlockInVM tbivm(this); | |
2147 // java_suspend_self() | |
2148 // } | |
2149 // set_thread_state(_thread_in_vm_trans); | |
2150 // if (safepoint) block; | |
2151 // set_thread_state(state); | |
2152 // | |
2153 // but that is pretty messy. Instead we just go with the way the | |
2154 // code has worked before and note that this is the only path to | |
2155 // java_suspend_self that doesn't put the thread in _thread_blocked | |
2156 // mode. | |
2157 | |
2158 frame_anchor()->make_walkable(this); | |
2159 java_suspend_self(); | |
2160 | |
2161 // We might be here for reasons in addition to the self-suspend request | |
2162 // so check for other async requests. | |
2163 } | |
2164 | |
2165 if (check_asyncs) { | |
2166 check_and_handle_async_exceptions(); | |
2167 } | |
2168 } | |
2169 | |
2170 void JavaThread::send_thread_stop(oop java_throwable) { | |
2171 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
2172 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
2173 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
2174 | |
2175 // Do not throw asynchronous exceptions against the compiler thread | |
2176 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
2177 if (is_Compiler_thread()) return; | |
2178 | |
2179 { | |
2180 // Actually throw the Throwable against the target Thread - however | |
2181 // only if there is no thread death exception installed already. | |
1142 | 2182 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2183 // If the topmost frame is a runtime stub, then we are calling into |
2184 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
2185 // must deoptimize the caller before continuing, as the compiled exception handler table | |
2186 // may not be valid | |
2187 if (has_last_Java_frame()) { | |
2188 frame f = last_frame(); | |
2189 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
2190 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2191 RegisterMap reg_map(this, UseBiasedLocking); | |
2192 frame compiled_frame = f.sender(®_map); | |
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2193 if (!StressCompiledExceptionHandlers && compiled_frame.can_be_deoptimized()) { |
0 | 2194 Deoptimization::deoptimize(this, compiled_frame, ®_map); |
2195 } | |
2196 } | |
2197 } | |
2198 | |
2199 // Set async. pending exception in thread. | |
2200 set_pending_async_exception(java_throwable); | |
2201 | |
2202 if (TraceExceptions) { | |
2203 ResourceMark rm; | |
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2204 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2205 } |
2206 // for AbortVMOnException flag | |
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2207 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
0 | 2208 } |
2209 } | |
2210 | |
2211 | |
2212 // Interrupt thread so it will wake up from a potential wait() | |
2213 Thread::interrupt(this); | |
2214 } | |
2215 | |
2216 // External suspension mechanism. | |
2217 // | |
2218 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
2219 // to any VM_locks and it is at a transition | |
2220 // Self-suspension will happen on the transition out of the vm. | |
2221 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
2222 // | |
2223 // Guarantees on return: | |
2224 // + Target thread will not execute any new bytecode (that's why we need to | |
2225 // force a safepoint) | |
2226 // + Target thread will not enter any new monitors | |
2227 // | |
2228 void JavaThread::java_suspend() { | |
2229 { MutexLocker mu(Threads_lock); | |
2230 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
2231 return; | |
2232 } | |
2233 } | |
2234 | |
2235 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2236 if (!is_external_suspend()) { | |
2237 // a racing resume has cancelled us; bail out now | |
2238 return; | |
2239 } | |
2240 | |
2241 // suspend is done | |
2242 uint32_t debug_bits = 0; | |
2243 // Warning: is_ext_suspend_completed() may temporarily drop the | |
2244 // SR_lock to allow the thread to reach a stable thread state if | |
2245 // it is currently in a transient thread state. | |
2246 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
2247 SuspendRetryDelay, &debug_bits) ) { | |
2248 return; | |
2249 } | |
2250 } | |
2251 | |
2252 VM_ForceSafepoint vm_suspend; | |
2253 VMThread::execute(&vm_suspend); | |
2254 } | |
2255 | |
2256 // Part II of external suspension. | |
2257 // A JavaThread self suspends when it detects a pending external suspend | |
2258 // request. This is usually on transitions. It is also done in places | |
2259 // where continuing to the next transition would surprise the caller, | |
2260 // e.g., monitor entry. | |
2261 // | |
2262 // Returns the number of times that the thread self-suspended. | |
2263 // | |
2264 // Note: DO NOT call java_suspend_self() when you just want to block current | |
2265 // thread. java_suspend_self() is the second stage of cooperative | |
2266 // suspension for external suspend requests and should only be used | |
2267 // to complete an external suspend request. | |
2268 // | |
2269 int JavaThread::java_suspend_self() { | |
2270 int ret = 0; | |
2271 | |
2272 // we are in the process of exiting so don't suspend | |
2273 if (is_exiting()) { | |
2274 clear_external_suspend(); | |
2275 return ret; | |
2276 } | |
2277 | |
2278 assert(_anchor.walkable() || | |
2279 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
2280 "must have walkable stack"); | |
2281 | |
2282 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2283 | |
979 | 2284 assert(!this->is_ext_suspended(), |
0 | 2285 "a thread trying to self-suspend should not already be suspended"); |
2286 | |
2287 if (this->is_suspend_equivalent()) { | |
2288 // If we are self-suspending as a result of the lifting of a | |
2289 // suspend equivalent condition, then the suspend_equivalent | |
2290 // flag is not cleared until we set the ext_suspended flag so | |
2291 // that wait_for_ext_suspend_completion() returns consistent | |
2292 // results. | |
2293 this->clear_suspend_equivalent(); | |
2294 } | |
2295 | |
2296 // A racing resume may have cancelled us before we grabbed SR_lock | |
2297 // above. Or another external suspend request could be waiting for us | |
2298 // by the time we return from SR_lock()->wait(). The thread | |
2299 // that requested the suspension may already be trying to walk our | |
2300 // stack and if we return now, we can change the stack out from under | |
2301 // it. This would be a "bad thing (TM)" and cause the stack walker | |
2302 // to crash. We stay self-suspended until there are no more pending | |
2303 // external suspend requests. | |
2304 while (is_external_suspend()) { | |
2305 ret++; | |
2306 this->set_ext_suspended(); | |
2307 | |
2308 // _ext_suspended flag is cleared by java_resume() | |
2309 while (is_ext_suspended()) { | |
2310 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
2311 } | |
2312 } | |
2313 | |
2314 return ret; | |
2315 } | |
2316 | |
2317 #ifdef ASSERT | |
2318 // verify the JavaThread has not yet been published in the Threads::list, and | |
2319 // hence doesn't need protection from concurrent access at this stage | |
2320 void JavaThread::verify_not_published() { | |
2321 if (!Threads_lock->owned_by_self()) { | |
2322 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
2323 assert( !Threads::includes(this), | |
2324 "java thread shouldn't have been published yet!"); | |
2325 } | |
2326 else { | |
2327 assert( !Threads::includes(this), | |
2328 "java thread shouldn't have been published yet!"); | |
2329 } | |
2330 } | |
2331 #endif | |
2332 | |
2333 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2334 // progress or when _suspend_flags is non-zero. | |
2335 // Current thread needs to self-suspend if there is a suspend request and/or | |
2336 // block if a safepoint is in progress. | |
2337 // Async exception ISN'T checked. | |
2338 // Note only the ThreadInVMfromNative transition can call this function | |
2339 // directly and when thread state is _thread_in_native_trans | |
2340 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
2341 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
2342 | |
2343 JavaThread *curJT = JavaThread::current(); | |
2344 bool do_self_suspend = thread->is_external_suspend(); | |
2345 | |
2346 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
2347 | |
2348 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2349 // thread is not the current thread. In older versions of jdbx, jdbx | |
2350 // threads could call into the VM with another thread's JNIEnv so we | |
2351 // can be here operating on behalf of a suspended thread (4432884). | |
2352 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2353 JavaThreadState state = thread->thread_state(); | |
2354 | |
2355 // We mark this thread_blocked state as a suspend-equivalent so | |
2356 // that a caller to is_ext_suspend_completed() won't be confused. | |
2357 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2358 thread->set_suspend_equivalent(); | |
2359 | |
2360 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2361 // wait until the thread changes to other thread state. There is no | |
2362 // guarantee on how soon we can obtain the SR_lock and complete the | |
2363 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2364 // too long. Temporarily change the state to _thread_blocked to | |
2365 // let the VM thread know that this thread is ready for GC. The problem | |
2366 // of changing thread state is that safepoint could happen just after | |
2367 // java_suspend_self() returns after being resumed, and VM thread will | |
2368 // see the _thread_blocked state. We must check for safepoint | |
2369 // after restoring the state and make sure we won't leave while a safepoint | |
2370 // is in progress. | |
2371 thread->set_thread_state(_thread_blocked); | |
2372 thread->java_suspend_self(); | |
2373 thread->set_thread_state(state); | |
2374 // Make sure new state is seen by VM thread | |
2375 if (os::is_MP()) { | |
2376 if (UseMembar) { | |
2377 // Force a fence between the write above and read below | |
2378 OrderAccess::fence(); | |
2379 } else { | |
2380 // Must use this rather than serialization page in particular on Windows | |
2381 InterfaceSupport::serialize_memory(thread); | |
2382 } | |
2383 } | |
2384 } | |
2385 | |
2386 if (SafepointSynchronize::do_call_back()) { | |
2387 // If we are safepointing, then block the caller which may not be | |
2388 // the same as the target thread (see above). | |
2389 SafepointSynchronize::block(curJT); | |
2390 } | |
2391 | |
2392 if (thread->is_deopt_suspend()) { | |
2393 thread->clear_deopt_suspend(); | |
2394 RegisterMap map(thread, false); | |
2395 frame f = thread->last_frame(); | |
2396 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2397 f = f.sender(&map); | |
2398 } | |
2399 if (f.id() == thread->must_deopt_id()) { | |
2400 thread->clear_must_deopt_id(); | |
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2401 f.deoptimize(thread); |
0 | 2402 } else { |
2403 fatal("missed deoptimization!"); | |
2404 } | |
2405 } | |
2406 } | |
2407 | |
2408 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2409 // progress or when _suspend_flags is non-zero. | |
2410 // Current thread needs to self-suspend if there is a suspend request and/or | |
2411 // block if a safepoint is in progress. | |
2412 // Also check for pending async exception (not including unsafe access error). | |
2413 // Note only the native==>VM/Java barriers can call this function and when | |
2414 // thread state is _thread_in_native_trans. | |
2415 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2416 check_safepoint_and_suspend_for_native_trans(thread); | |
2417 | |
2418 if (thread->has_async_exception()) { | |
2419 // We are in _thread_in_native_trans state, don't handle unsafe | |
2420 // access error since that may block. | |
2421 thread->check_and_handle_async_exceptions(false); | |
2422 } | |
2423 } | |
2424 | |
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2425 // This is a variant of the normal |
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2426 // check_special_condition_for_native_trans with slightly different |
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2427 // semantics for use by critical native wrappers. It does all the |
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2428 // normal checks but also performs the transition back into |
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2429 // thread_in_Java state. This is required so that critical natives |
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2430 // can potentially block and perform a GC if they are the last thread |
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2431 // exiting the GC_locker. |
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2432 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
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2433 check_special_condition_for_native_trans(thread); |
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2434 |
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2435 // Finish the transition |
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2436 thread->set_thread_state(_thread_in_Java); |
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2437 |
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2438 if (thread->do_critical_native_unlock()) { |
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2439 ThreadInVMfromJavaNoAsyncException tiv(thread); |
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2440 GC_locker::unlock_critical(thread); |
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2441 thread->clear_critical_native_unlock(); |
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2442 } |
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2443 } |
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2444 |
0 | 2445 // We need to guarantee the Threads_lock here, since resumes are not |
2446 // allowed during safepoint synchronization | |
2447 // Can only resume from an external suspension | |
2448 void JavaThread::java_resume() { | |
2449 assert_locked_or_safepoint(Threads_lock); | |
2450 | |
2451 // Sanity check: thread is gone, has started exiting or the thread | |
2452 // was not externally suspended. | |
2453 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2454 return; | |
2455 } | |
2456 | |
2457 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2458 | |
2459 clear_external_suspend(); | |
2460 | |
2461 if (is_ext_suspended()) { | |
2462 clear_ext_suspended(); | |
2463 SR_lock()->notify_all(); | |
2464 } | |
2465 } | |
2466 | |
2467 void JavaThread::create_stack_guard_pages() { | |
2468 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2469 address low_addr = stack_base() - stack_size(); | |
2470 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2471 | |
2472 int allocate = os::allocate_stack_guard_pages(); | |
2473 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2474 | |
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2475 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
0 | 2476 warning("Attempt to allocate stack guard pages failed."); |
2477 return; | |
2478 } | |
2479 | |
2480 if (os::guard_memory((char *) low_addr, len)) { | |
2481 _stack_guard_state = stack_guard_enabled; | |
2482 } else { | |
2483 warning("Attempt to protect stack guard pages failed."); | |
2484 if (os::uncommit_memory((char *) low_addr, len)) { | |
2485 warning("Attempt to deallocate stack guard pages failed."); | |
2486 } | |
2487 } | |
2488 } | |
2489 | |
2490 void JavaThread::remove_stack_guard_pages() { | |
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2491 assert(Thread::current() == this, "from different thread"); |
0 | 2492 if (_stack_guard_state == stack_guard_unused) return; |
2493 address low_addr = stack_base() - stack_size(); | |
2494 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2495 | |
2496 if (os::allocate_stack_guard_pages()) { | |
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2497 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
0 | 2498 _stack_guard_state = stack_guard_unused; |
2499 } else { | |
2500 warning("Attempt to deallocate stack guard pages failed."); | |
2501 } | |
2502 } else { | |
2503 if (_stack_guard_state == stack_guard_unused) return; | |
2504 if (os::unguard_memory((char *) low_addr, len)) { | |
2505 _stack_guard_state = stack_guard_unused; | |
2506 } else { | |
2507 warning("Attempt to unprotect stack guard pages failed."); | |
2508 } | |
2509 } | |
2510 } | |
2511 | |
2512 void JavaThread::enable_stack_yellow_zone() { | |
2513 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2514 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2515 | |
2516 // The base notation is from the stacks point of view, growing downward. | |
2517 // We need to adjust it to work correctly with guard_memory() | |
2518 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2519 | |
2520 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2521 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2522 | |
2523 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2524 _stack_guard_state = stack_guard_enabled; | |
2525 } else { | |
2526 warning("Attempt to guard stack yellow zone failed."); | |
2527 } | |
2528 enable_register_stack_guard(); | |
2529 } | |
2530 | |
2531 void JavaThread::disable_stack_yellow_zone() { | |
2532 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2533 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2534 | |
2535 // Simply return if called for a thread that does not use guard pages. | |
2536 if (_stack_guard_state == stack_guard_unused) return; | |
2537 | |
2538 // The base notation is from the stacks point of view, growing downward. | |
2539 // We need to adjust it to work correctly with guard_memory() | |
2540 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2541 | |
2542 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2543 _stack_guard_state = stack_guard_yellow_disabled; | |
2544 } else { | |
2545 warning("Attempt to unguard stack yellow zone failed."); | |
2546 } | |
2547 disable_register_stack_guard(); | |
2548 } | |
2549 | |
2550 void JavaThread::enable_stack_red_zone() { | |
2551 // The base notation is from the stacks point of view, growing downward. | |
2552 // We need to adjust it to work correctly with guard_memory() | |
2553 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2554 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2555 | |
2556 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2557 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2558 | |
2559 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2560 warning("Attempt to guard stack red zone failed."); | |
2561 } | |
2562 } | |
2563 | |
2564 void JavaThread::disable_stack_red_zone() { | |
2565 // The base notation is from the stacks point of view, growing downward. | |
2566 // We need to adjust it to work correctly with guard_memory() | |
2567 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2568 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2569 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2570 warning("Attempt to unguard stack red zone failed."); | |
2571 } | |
2572 } | |
2573 | |
2574 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2575 // ignore is there is no stack | |
2576 if (!has_last_Java_frame()) return; | |
2577 // traverse the stack frames. Starts from top frame. | |
2578 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2579 frame* fr = fst.current(); | |
2580 f(fr, fst.register_map()); | |
2581 } | |
2582 } | |
2583 | |
2584 | |
2585 #ifndef PRODUCT | |
2586 // Deoptimization | |
2587 // Function for testing deoptimization | |
2588 void JavaThread::deoptimize() { | |
2589 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2590 StackFrameStream fst(this, UseBiasedLocking); | |
2591 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2592 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2593 // Iterate over all frames in the thread and deoptimize | |
2594 for(; !fst.is_done(); fst.next()) { | |
2595 if(fst.current()->can_be_deoptimized()) { | |
2596 | |
2597 if (only_at) { | |
2598 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2599 // consists of comma or carriage return separated numbers so | |
2600 // search for the current bci in that string. | |
2601 address pc = fst.current()->pc(); | |
2602 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2603 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2604 char buffer[8]; | |
2605 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2606 size_t len = strlen(buffer); | |
2607 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2608 while (found != NULL) { | |
2609 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2610 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2611 // Check that the bci found is bracketed by terminators. | |
2612 break; | |
2613 } | |
2614 found = strstr(found + 1, buffer); | |
2615 } | |
2616 if (!found) { | |
2617 continue; | |
2618 } | |
2619 } | |
2620 | |
2621 if (DebugDeoptimization && !deopt) { | |
2622 deopt = true; // One-time only print before deopt | |
2623 tty->print_cr("[BEFORE Deoptimization]"); | |
2624 trace_frames(); | |
2625 trace_stack(); | |
2626 } | |
2627 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2628 } | |
2629 } | |
2630 | |
2631 if (DebugDeoptimization && deopt) { | |
2632 tty->print_cr("[AFTER Deoptimization]"); | |
2633 trace_frames(); | |
2634 } | |
2635 } | |
2636 | |
2637 | |
2638 // Make zombies | |
2639 void JavaThread::make_zombies() { | |
2640 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2641 if (fst.current()->can_be_deoptimized()) { | |
2642 // it is a Java nmethod | |
2643 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2644 nm->make_not_entrant(); | |
2645 } | |
2646 } | |
2647 } | |
2648 #endif // PRODUCT | |
2649 | |
2650 | |
2651 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2652 if (!has_last_Java_frame()) return; | |
2653 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2654 StackFrameStream fst(this, UseBiasedLocking); | |
2655 for(; !fst.is_done(); fst.next()) { | |
2656 if (fst.current()->should_be_deoptimized()) { | |
6843 | 2657 if (LogCompilation && xtty != NULL) { |
2658 nmethod* nm = fst.current()->cb()->as_nmethod_or_null(); | |
2659 xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'", | |
2660 this->name(), nm != NULL ? nm->compile_id() : -1); | |
2661 } | |
2662 | |
0 | 2663 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); |
2664 } | |
2665 } | |
2666 } | |
2667 | |
2668 | |
2669 // GC support | |
2670 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2671 | |
2672 void JavaThread::gc_epilogue() { | |
2673 frames_do(frame_gc_epilogue); | |
2674 } | |
2675 | |
2676 | |
2677 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2678 | |
2679 void JavaThread::gc_prologue() { | |
2680 frames_do(frame_gc_prologue); | |
2681 } | |
2682 | |
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2683 // If the caller is a NamedThread, then remember, in the current scope, |
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2684 // the given JavaThread in its _processed_thread field. |
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2685 class RememberProcessedThread: public StackObj { |
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2686 NamedThread* _cur_thr; |
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2687 public: |
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2688 RememberProcessedThread(JavaThread* jthr) { |
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2689 Thread* thread = Thread::current(); |
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2690 if (thread->is_Named_thread()) { |
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2691 _cur_thr = (NamedThread *)thread; |
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2692 _cur_thr->set_processed_thread(jthr); |
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2693 } else { |
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2694 _cur_thr = NULL; |
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2695 } |
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2696 } |
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2697 |
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2698 ~RememberProcessedThread() { |
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2699 if (_cur_thr) { |
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2700 _cur_thr->set_processed_thread(NULL); |
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2701 } |
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2702 } |
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2703 }; |
0 | 2704 |
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2705 void JavaThread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
1166 | 2706 // Verify that the deferred card marks have been flushed. |
2707 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
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2708 |
0 | 2709 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
2710 // since there may be more than one thread using each ThreadProfiler. | |
2711 | |
2712 // Traverse the GCHandles | |
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2713 Thread::oops_do(f, cld_f, cf); |
0 | 2714 |
2715 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2716 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2717 | |
2718 if (has_last_Java_frame()) { | |
1119
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2719 // Record JavaThread to GC thread |
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2720 RememberProcessedThread rpt(this); |
0 | 2721 |
2722 // Traverse the privileged stack | |
2723 if (_privileged_stack_top != NULL) { | |
2724 _privileged_stack_top->oops_do(f); | |
2725 } | |
2726 | |
2727 // traverse the registered growable array | |
2728 if (_array_for_gc != NULL) { | |
2729 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2730 f->do_oop(_array_for_gc->adr_at(index)); | |
2731 } | |
2732 } | |
2733 | |
2734 // Traverse the monitor chunks | |
2735 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2736 chunk->oops_do(f); | |
2737 } | |
2738 | |
2739 // Traverse the execution stack | |
2740 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2741 fst.current()->oops_do(f, cld_f, cf, fst.register_map()); |
0 | 2742 } |
2743 } | |
2744 | |
2745 // callee_target is never live across a gc point so NULL it here should | |
2746 // it still contain a methdOop. | |
2747 | |
2748 set_callee_target(NULL); | |
2749 | |
2750 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2751 // If we have deferred set_locals there might be oops waiting to be | |
2752 // written | |
2753 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2754 if (list != NULL) { | |
2755 for (int i = 0; i < list->length(); i++) { | |
2756 list->at(i)->oops_do(f); | |
2757 } | |
2758 } | |
2759 | |
2760 // Traverse instance variables at the end since the GC may be moving things | |
2761 // around using this function | |
2762 f->do_oop((oop*) &_threadObj); | |
2763 f->do_oop((oop*) &_vm_result); | |
2764 f->do_oop((oop*) &_exception_oop); | |
2765 f->do_oop((oop*) &_pending_async_exception); | |
2766 | |
2767 if (jvmti_thread_state() != NULL) { | |
2768 jvmti_thread_state()->oops_do(f); | |
2769 } | |
2770 } | |
2771 | |
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2772 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
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2773 Thread::nmethods_do(cf); // (super method is a no-op) |
0 | 2774 |
2775 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2776 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2777 | |
2778 if (has_last_Java_frame()) { | |
2779 // Traverse the execution stack | |
2780 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2781 fst.current()->nmethods_do(cf); |
0 | 2782 } |
2783 } | |
2784 } | |
2785 | |
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2786 void JavaThread::metadata_do(void f(Metadata*)) { |
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2787 Thread::metadata_do(f); |
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2788 if (has_last_Java_frame()) { |
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2789 // Traverse the execution stack to call f() on the methods in the stack |
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2790 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
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2791 fst.current()->metadata_do(f); |
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2792 } |
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2793 } else if (is_Compiler_thread()) { |
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2794 // need to walk ciMetadata in current compile tasks to keep alive. |
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2795 CompilerThread* ct = (CompilerThread*)this; |
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2796 if (ct->env() != NULL) { |
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2797 ct->env()->metadata_do(f); |
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2798 } |
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2799 } |
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2800 } |
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2801 |
0 | 2802 // Printing |
2803 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2804 switch (_thread_state) { | |
2805 case _thread_uninitialized: return "_thread_uninitialized"; | |
2806 case _thread_new: return "_thread_new"; | |
2807 case _thread_new_trans: return "_thread_new_trans"; | |
2808 case _thread_in_native: return "_thread_in_native"; | |
2809 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2810 case _thread_in_vm: return "_thread_in_vm"; | |
2811 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2812 case _thread_in_Java: return "_thread_in_Java"; | |
2813 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2814 case _thread_blocked: return "_thread_blocked"; | |
2815 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2816 default: return "unknown thread state"; | |
2817 } | |
2818 } | |
2819 | |
2820 #ifndef PRODUCT | |
2821 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2822 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2823 }; | |
2824 void JavaThread::print_thread_state() const { | |
2825 print_thread_state_on(tty); | |
2826 }; | |
2827 #endif // PRODUCT | |
2828 | |
2829 // Called by Threads::print() for VM_PrintThreads operation | |
2830 void JavaThread::print_on(outputStream *st) const { | |
2831 st->print("\"%s\" ", get_thread_name()); | |
2832 oop thread_oop = threadObj(); | |
6766 | 2833 if (thread_oop != NULL) { |
2834 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); | |
2835 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2836 st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); | |
2837 } | |
0 | 2838 Thread::print_on(st); |
2839 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
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2840 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
0 | 2841 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
2842 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2843 } | |
2844 #ifndef PRODUCT | |
2845 print_thread_state_on(st); | |
2846 _safepoint_state->print_on(st); | |
2847 #endif // PRODUCT | |
2848 } | |
2849 | |
2850 // Called by fatal error handler. The difference between this and | |
2851 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2852 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2853 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2854 oop thread_obj = threadObj(); | |
2855 if (thread_obj != NULL) { | |
2856 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2857 } | |
2858 st->print(" ["); | |
2859 st->print("%s", _get_thread_state_name(_thread_state)); | |
2860 if (osthread()) { | |
2861 st->print(", id=%d", osthread()->thread_id()); | |
2862 } | |
2863 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2864 _stack_base - _stack_size, _stack_base); | |
2865 st->print("]"); | |
2866 return; | |
2867 } | |
2868 | |
2869 // Verification | |
2870 | |
2871 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2872 | |
2873 void JavaThread::verify() { | |
2874 // Verify oops in the thread. | |
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|
2875 oops_do(&VerifyOopClosure::verify_oop, NULL, NULL); |
0 | 2876 |
2877 // Verify the stack frames. | |
2878 frames_do(frame_verify); | |
2879 } | |
2880 | |
2881 // CR 6300358 (sub-CR 2137150) | |
2882 // Most callers of this method assume that it can't return NULL but a | |
2883 // thread may not have a name whilst it is in the process of attaching to | |
2884 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2885 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2886 // if vm exit occurs during initialization). These cases can all be accounted | |
2887 // for such that this method never returns NULL. | |
2888 const char* JavaThread::get_thread_name() const { | |
2889 #ifdef ASSERT | |
2890 // early safepoints can hit while current thread does not yet have TLS | |
2891 if (!SafepointSynchronize::is_at_safepoint()) { | |
2892 Thread *cur = Thread::current(); | |
2893 if (!(cur->is_Java_thread() && cur == this)) { | |
2894 // Current JavaThreads are allowed to get their own name without | |
2895 // the Threads_lock. | |
2896 assert_locked_or_safepoint(Threads_lock); | |
2897 } | |
2898 } | |
2899 #endif // ASSERT | |
2900 return get_thread_name_string(); | |
2901 } | |
2902 | |
2903 // Returns a non-NULL representation of this thread's name, or a suitable | |
2904 // descriptive string if there is no set name | |
2905 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2906 const char* name_str; | |
2907 oop thread_obj = threadObj(); | |
2908 if (thread_obj != NULL) { | |
2909 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2910 if (name != NULL) { | |
2911 if (buf == NULL) { | |
2912 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2913 } | |
2914 else { | |
2915 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2916 } | |
2917 } | |
4006 | 2918 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
0 | 2919 name_str = "<no-name - thread is attaching>"; |
2920 } | |
2921 else { | |
2922 name_str = Thread::name(); | |
2923 } | |
2924 } | |
2925 else { | |
2926 name_str = Thread::name(); | |
2927 } | |
2928 assert(name_str != NULL, "unexpected NULL thread name"); | |
2929 return name_str; | |
2930 } | |
2931 | |
2932 | |
2933 const char* JavaThread::get_threadgroup_name() const { | |
2934 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2935 oop thread_obj = threadObj(); | |
2936 if (thread_obj != NULL) { | |
2937 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2938 if (thread_group != NULL) { | |
2939 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
2940 // ThreadGroup.name can be null | |
2941 if (name != NULL) { | |
2942 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2943 return str; | |
2944 } | |
2945 } | |
2946 } | |
2947 return NULL; | |
2948 } | |
2949 | |
2950 const char* JavaThread::get_parent_name() const { | |
2951 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2952 oop thread_obj = threadObj(); | |
2953 if (thread_obj != NULL) { | |
2954 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2955 if (thread_group != NULL) { | |
2956 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
2957 if (parent != NULL) { | |
2958 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
2959 // ThreadGroup.name can be null | |
2960 if (name != NULL) { | |
2961 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2962 return str; | |
2963 } | |
2964 } | |
2965 } | |
2966 } | |
2967 return NULL; | |
2968 } | |
2969 | |
2970 ThreadPriority JavaThread::java_priority() const { | |
2971 oop thr_oop = threadObj(); | |
2972 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
2973 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
2974 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
2975 return priority; | |
2976 } | |
2977 | |
2978 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
2979 | |
2980 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
2981 // Link Java Thread object <-> C++ Thread | |
2982 | |
2983 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
2984 // and put it into a new Handle. The Handle "thread_oop" can then | |
2985 // be used to pass the C++ thread object to other methods. | |
2986 | |
2987 // Set the Java level thread object (jthread) field of the | |
2988 // new thread (a JavaThread *) to C++ thread object using the | |
2989 // "thread_oop" handle. | |
2990 | |
2991 // Set the thread field (a JavaThread *) of the | |
2992 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
2993 | |
2994 Handle thread_oop(Thread::current(), | |
2995 JNIHandles::resolve_non_null(jni_thread)); | |
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2996 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
0 | 2997 "must be initialized"); |
2998 set_threadObj(thread_oop()); | |
2999 java_lang_Thread::set_thread(thread_oop(), this); | |
3000 | |
3001 if (prio == NoPriority) { | |
3002 prio = java_lang_Thread::priority(thread_oop()); | |
3003 assert(prio != NoPriority, "A valid priority should be present"); | |
3004 } | |
3005 | |
3006 // Push the Java priority down to the native thread; needs Threads_lock | |
3007 Thread::set_priority(this, prio); | |
3008 | |
3009 // Add the new thread to the Threads list and set it in motion. | |
3010 // We must have threads lock in order to call Threads::add. | |
3011 // It is crucial that we do not block before the thread is | |
3012 // added to the Threads list for if a GC happens, then the java_thread oop | |
3013 // will not be visited by GC. | |
3014 Threads::add(this); | |
3015 } | |
3016 | |
3017 oop JavaThread::current_park_blocker() { | |
3018 // Support for JSR-166 locks | |
3019 oop thread_oop = threadObj(); | |
242 | 3020 if (thread_oop != NULL && |
3021 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 3022 return java_lang_Thread::park_blocker(thread_oop); |
3023 } | |
3024 return NULL; | |
3025 } | |
3026 | |
3027 | |
3028 void JavaThread::print_stack_on(outputStream* st) { | |
3029 if (!has_last_Java_frame()) return; | |
3030 ResourceMark rm; | |
3031 HandleMark hm; | |
3032 | |
3033 RegisterMap reg_map(this); | |
3034 vframe* start_vf = last_java_vframe(®_map); | |
3035 int count = 0; | |
3036 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3037 if (f->is_java_frame()) { | |
3038 javaVFrame* jvf = javaVFrame::cast(f); | |
3039 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
3040 | |
3041 // Print out lock information | |
3042 if (JavaMonitorsInStackTrace) { | |
3043 jvf->print_lock_info_on(st, count); | |
3044 } | |
3045 } else { | |
3046 // Ignore non-Java frames | |
3047 } | |
3048 | |
3049 // Bail-out case for too deep stacks | |
3050 count++; | |
3051 if (MaxJavaStackTraceDepth == count) return; | |
3052 } | |
3053 } | |
3054 | |
3055 | |
3056 // JVMTI PopFrame support | |
3057 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
3058 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
3059 if (in_bytes(size_in_bytes) != 0) { | |
6197 | 3060 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
0 | 3061 _popframe_preserved_args_size = in_bytes(size_in_bytes); |
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1584
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3062 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
0 | 3063 } |
3064 } | |
3065 | |
3066 void* JavaThread::popframe_preserved_args() { | |
3067 return _popframe_preserved_args; | |
3068 } | |
3069 | |
3070 ByteSize JavaThread::popframe_preserved_args_size() { | |
3071 return in_ByteSize(_popframe_preserved_args_size); | |
3072 } | |
3073 | |
3074 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
3075 int sz = in_bytes(popframe_preserved_args_size()); | |
3076 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
3077 return in_WordSize(sz / wordSize); | |
3078 } | |
3079 | |
3080 void JavaThread::popframe_free_preserved_args() { | |
3081 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
6197 | 3082 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
0 | 3083 _popframe_preserved_args = NULL; |
3084 _popframe_preserved_args_size = 0; | |
3085 } | |
3086 | |
3087 #ifndef PRODUCT | |
3088 | |
3089 void JavaThread::trace_frames() { | |
3090 tty->print_cr("[Describe stack]"); | |
3091 int frame_no = 1; | |
3092 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
3093 tty->print(" %d. ", frame_no++); | |
3094 fst.current()->print_value_on(tty,this); | |
3095 tty->cr(); | |
3096 } | |
3097 } | |
3098 | |
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|
3099 class PrintAndVerifyOopClosure: public OopClosure { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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|
3100 protected: |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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diff
changeset
|
3101 template <class T> inline void do_oop_work(T* p) { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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changeset
|
3102 oop obj = oopDesc::load_decode_heap_oop(p); |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3103 if (obj == NULL) return; |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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changeset
|
3104 tty->print(INTPTR_FORMAT ": ", p); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
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|
3105 if (obj->is_oop_or_null()) { |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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changeset
|
3106 if (obj->is_objArray()) { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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changeset
|
3107 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3108 } else { |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3109 obj->print(); |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3110 } |
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|
3111 } else { |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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|
3112 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3113 } |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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diff
changeset
|
3114 tty->cr(); |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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3899
diff
changeset
|
3115 } |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
3899
diff
changeset
|
3116 public: |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3117 virtual void do_oop(oop* p) { do_oop_work(p); } |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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|
3118 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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diff
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|
3119 }; |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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diff
changeset
|
3120 |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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diff
changeset
|
3121 |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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diff
changeset
|
3122 static void oops_print(frame* f, const RegisterMap *map) { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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|
3123 PrintAndVerifyOopClosure print; |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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changeset
|
3124 f->print_value(); |
7179
d0aa87f04bd5
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|
3125 f->oops_do(&print, NULL, NULL, (RegisterMap*)map); |
3908
7588156f5cf9
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|
3126 } |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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diff
changeset
|
3127 |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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changeset
|
3128 // Print our all the locations that contain oops and whether they are |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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|
3129 // valid or not. This useful when trying to find the oldest frame |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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|
3130 // where an oop has gone bad since the frame walk is from youngest to |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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|
3131 // oldest. |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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diff
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|
3132 void JavaThread::trace_oops() { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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changeset
|
3133 tty->print_cr("[Trace oops]"); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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|
3134 frames_do(oops_print); |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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|
3135 } |
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|
3136 |
0 | 3137 |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
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3384
diff
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|
3138 #ifdef ASSERT |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
2416
diff
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|
3139 // Print or validate the layout of stack frames |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
2416
diff
changeset
|
3140 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
2416
diff
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|
3141 ResourceMark rm; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
2416
diff
changeset
|
3142 PRESERVE_EXCEPTION_MARK; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3143 FrameValues values; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3144 int frame_no = 0; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
2416
diff
changeset
|
3145 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3146 fst.current()->describe(values, ++frame_no); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3147 if (depth == frame_no) break; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3148 } |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3149 if (validate_only) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3150 values.validate(); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3151 } else { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3152 tty->print_cr("[Describe stack layout]"); |
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b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
4007
diff
changeset
|
3153 values.print(this); |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3154 } |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3155 } |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
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parents:
3384
diff
changeset
|
3156 #endif |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
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|
3157 |
0 | 3158 void JavaThread::trace_stack_from(vframe* start_vf) { |
3159 ResourceMark rm; | |
3160 int vframe_no = 1; | |
3161 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3162 if (f->is_java_frame()) { | |
3163 javaVFrame::cast(f)->print_activation(vframe_no++); | |
3164 } else { | |
3165 f->print(); | |
3166 } | |
3167 if (vframe_no > StackPrintLimit) { | |
3168 tty->print_cr("...<more frames>..."); | |
3169 return; | |
3170 } | |
3171 } | |
3172 } | |
3173 | |
3174 | |
3175 void JavaThread::trace_stack() { | |
3176 if (!has_last_Java_frame()) return; | |
3177 ResourceMark rm; | |
3178 HandleMark hm; | |
3179 RegisterMap reg_map(this); | |
3180 trace_stack_from(last_java_vframe(®_map)); | |
3181 } | |
3182 | |
3183 | |
3184 #endif // PRODUCT | |
3185 | |
3186 | |
3187 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
3188 assert(reg_map != NULL, "a map must be given"); | |
3189 frame f = last_frame(); | |
3190 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
3191 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
3192 } | |
3193 return NULL; | |
3194 } | |
3195 | |
3196 | |
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3197 Klass* JavaThread::security_get_caller_class(int depth) { |
0 | 3198 vframeStream vfst(this); |
3199 vfst.security_get_caller_frame(depth); | |
3200 if (!vfst.at_end()) { | |
3201 return vfst.method()->method_holder(); | |
3202 } | |
3203 return NULL; | |
3204 } | |
3205 | |
3206 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
3207 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
3208 CompileBroker::compiler_thread_loop(); | |
3209 } | |
3210 | |
3211 // Create a CompilerThread | |
3212 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
3213 : JavaThread(&compiler_thread_entry) { | |
3214 _env = NULL; | |
3215 _log = NULL; | |
3216 _task = NULL; | |
3217 _queue = queue; | |
3218 _counters = counters; | |
1584 | 3219 _buffer_blob = NULL; |
3384
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3220 _scanned_nmethod = NULL; |
0 | 3221 |
3222 #ifndef PRODUCT | |
3223 _ideal_graph_printer = NULL; | |
3224 #endif | |
3225 } | |
3226 | |
7179
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3227 void CompilerThread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
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3228 JavaThread::oops_do(f, cld_f, cf); |
3384
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|
3229 if (_scanned_nmethod != NULL && cf != NULL) { |
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3230 // Safepoints can occur when the sweeper is scanning an nmethod so |
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|
3231 // process it here to make sure it isn't unloaded in the middle of |
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|
3232 // a scan. |
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|
3233 cf->do_code_blob(_scanned_nmethod); |
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|
3234 } |
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|
3235 } |
0 | 3236 |
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; | |
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3250 #ifdef ASSERT |
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3251 bool Threads::_vm_complete = false; |
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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 void os_stream(); | |
3258 | |
3259 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
3260 void Threads::threads_do(ThreadClosure* tc) { | |
3261 assert_locked_or_safepoint(Threads_lock); | |
3262 // ALL_JAVA_THREADS iterates through all JavaThreads | |
3263 ALL_JAVA_THREADS(p) { | |
3264 tc->do_thread(p); | |
3265 } | |
3266 // Someday we could have a table or list of all non-JavaThreads. | |
3267 // For now, just manually iterate through them. | |
3268 tc->do_thread(VMThread::vm_thread()); | |
3269 Universe::heap()->gc_threads_do(tc); | |
323
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3270 WatcherThread *wt = WatcherThread::watcher_thread(); |
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3271 // Strictly speaking, the following NULL check isn't sufficient to make sure |
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3272 // the data for WatcherThread is still valid upon being examined. However, |
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3273 // considering that WatchThread terminates when the VM is on the way to |
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|
3274 // exit at safepoint, the chance of the above is extremely small. The right |
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|
3275 // way to prevent termination of WatcherThread would be to acquire |
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|
3276 // Terminator_lock, but we can't do that without violating the lock rank |
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|
3277 // checking in some cases. |
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|
3278 if (wt != NULL) |
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|
3279 tc->do_thread(wt); |
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|
3280 |
0 | 3281 // If CompilerThreads ever become non-JavaThreads, add them here |
3282 } | |
3283 | |
3284 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
3285 | |
242 | 3286 extern void JDK_Version_init(); |
3287 | |
0 | 3288 // Check version |
3289 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
3290 | |
3291 // Initialize the output stream module | |
3292 ostream_init(); | |
3293 | |
3294 // Process java launcher properties. | |
3295 Arguments::process_sun_java_launcher_properties(args); | |
3296 | |
3297 // Initialize the os module before using TLS | |
3298 os::init(); | |
3299 | |
3300 // Initialize system properties. | |
3301 Arguments::init_system_properties(); | |
3302 | |
242 | 3303 // So that JDK version can be used as a discrimintor when parsing arguments |
3304 JDK_Version_init(); | |
3305 | |
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3306 // Update/Initialize System properties after JDK version number is known |
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6988363: Rebrand vm vendor property settings (jdk7 only)
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|
3307 Arguments::init_version_specific_system_properties(); |
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|
3308 |
0 | 3309 // Parse arguments |
3310 jint parse_result = Arguments::parse(args); | |
3311 if (parse_result != JNI_OK) return parse_result; | |
3312 | |
3313 if (PauseAtStartup) { | |
3314 os::pause(); | |
3315 } | |
3316 | |
4006 | 3317 #ifndef USDT2 |
0 | 3318 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
4006 | 3319 #else /* USDT2 */ |
3320 HOTSPOT_VM_INIT_BEGIN(); | |
3321 #endif /* USDT2 */ | |
0 | 3322 |
3323 // Record VM creation timing statistics | |
3324 TraceVmCreationTime create_vm_timer; | |
3325 create_vm_timer.start(); | |
3326 | |
3327 // Timing (must come after argument parsing) | |
3328 TraceTime timer("Create VM", TraceStartupTime); | |
3329 | |
3330 // Initialize the os module after parsing the args | |
3331 jint os_init_2_result = os::init_2(); | |
3332 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
3333 | |
7177
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7198334: UseNUMA modifies system parameters on non-NUMA system
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3334 jint adjust_after_os_result = Arguments::adjust_after_os(); |
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|
3335 if (adjust_after_os_result != JNI_OK) return adjust_after_os_result; |
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3336 |
6197 | 3337 // intialize TLS |
3338 ThreadLocalStorage::init(); | |
3339 | |
3340 // Bootstrap native memory tracking, so it can start recording memory | |
3341 // activities before worker thread is started. This is the first phase | |
3342 // of bootstrapping, VM is currently running in single-thread mode. | |
3343 MemTracker::bootstrap_single_thread(); | |
3344 | |
0 | 3345 // Initialize output stream logging |
3346 ostream_init_log(); | |
3347 | |
3348 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
3349 // Must be before create_vm_init_agents() | |
3350 if (Arguments::init_libraries_at_startup()) { | |
3351 convert_vm_init_libraries_to_agents(); | |
3352 } | |
3353 | |
3354 // Launch -agentlib/-agentpath and converted -Xrun agents | |
3355 if (Arguments::init_agents_at_startup()) { | |
3356 create_vm_init_agents(); | |
3357 } | |
3358 | |
3359 // Initialize Threads state | |
3360 _thread_list = NULL; | |
3361 _number_of_threads = 0; | |
3362 _number_of_non_daemon_threads = 0; | |
3363 | |
3364 // Initialize global data structures and create system classes in heap | |
3365 vm_init_globals(); | |
3366 | |
3367 // Attach the main thread to this os thread | |
3368 JavaThread* main_thread = new JavaThread(); | |
3369 main_thread->set_thread_state(_thread_in_vm); | |
3370 // must do this before set_active_handles and initialize_thread_local_storage | |
3371 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
3372 // change the stack size recorded here to one based on the java thread | |
3373 // stacksize. This adjusted size is what is used to figure the placement | |
3374 // of the guard pages. | |
3375 main_thread->record_stack_base_and_size(); | |
3376 main_thread->initialize_thread_local_storage(); | |
3377 | |
3378 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
3379 | |
3380 if (!main_thread->set_as_starting_thread()) { | |
3381 vm_shutdown_during_initialization( | |
3382 "Failed necessary internal allocation. Out of swap space"); | |
3383 delete main_thread; | |
3384 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3385 return JNI_ENOMEM; | |
3386 } | |
3387 | |
3388 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
3389 // crash Linux VM, see notes in os_linux.cpp. | |
3390 main_thread->create_stack_guard_pages(); | |
3391 | |
1878 | 3392 // Initialize Java-Level synchronization subsystem |
3393 ObjectMonitor::Initialize() ; | |
0 | 3394 |
6197 | 3395 // Second phase of bootstrapping, VM is about entering multi-thread mode |
3396 MemTracker::bootstrap_multi_thread(); | |
3397 | |
0 | 3398 // Initialize global modules |
3399 jint status = init_globals(); | |
3400 if (status != JNI_OK) { | |
3401 delete main_thread; | |
3402 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3403 return status; | |
3404 } | |
3405 | |
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126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
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|
3406 // Should be done after the heap is fully created |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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1608
diff
changeset
|
3407 main_thread->cache_global_variables(); |
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|
3408 |
0 | 3409 HandleMark hm; |
3410 | |
3411 { MutexLocker mu(Threads_lock); | |
3412 Threads::add(main_thread); | |
3413 } | |
3414 | |
3415 // Any JVMTI raw monitors entered in onload will transition into | |
3416 // real raw monitor. VM is setup enough here for raw monitor enter. | |
3417 JvmtiExport::transition_pending_onload_raw_monitors(); | |
3418 | |
3419 if (VerifyBeforeGC && | |
3420 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
3421 Universe::heap()->prepare_for_verify(); | |
3422 Universe::verify(); // make sure we're starting with a clean slate | |
3423 } | |
3424 | |
6197 | 3425 // Fully start NMT |
3426 MemTracker::start(); | |
3427 | |
0 | 3428 // Create the VMThread |
3429 { TraceTime timer("Start VMThread", TraceStartupTime); | |
3430 VMThread::create(); | |
3431 Thread* vmthread = VMThread::vm_thread(); | |
3432 | |
3433 if (!os::create_thread(vmthread, os::vm_thread)) | |
3434 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
3435 | |
3436 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
3437 // Monitors can have spurious returns, must always check another state flag | |
3438 { | |
3439 MutexLocker ml(Notify_lock); | |
3440 os::start_thread(vmthread); | |
3441 while (vmthread->active_handles() == NULL) { | |
3442 Notify_lock->wait(); | |
3443 } | |
3444 } | |
3445 } | |
3446 | |
3447 assert (Universe::is_fully_initialized(), "not initialized"); | |
3448 EXCEPTION_MARK; | |
3449 | |
3450 // At this point, the Universe is initialized, but we have not executed | |
3451 // any byte code. Now is a good time (the only time) to dump out the | |
3452 // internal state of the JVM for sharing. | |
3453 if (DumpSharedSpaces) { | |
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|
3454 MetaspaceShared::preload_and_dump(CHECK_0); |
0 | 3455 ShouldNotReachHere(); |
3456 } | |
3457 | |
3458 // Always call even when there are not JVMTI environments yet, since environments | |
3459 // may be attached late and JVMTI must track phases of VM execution | |
3460 JvmtiExport::enter_start_phase(); | |
3461 | |
3462 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
3463 JvmtiExport::post_vm_start(); | |
3464 | |
3465 { | |
3466 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
3467 | |
3468 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3469 create_vm_init_libraries(); | |
3470 } | |
3471 | |
7608 | 3472 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
0 | 3473 |
18
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3474 if (AggressiveOpts) { |
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3475 { |
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|
3476 // Forcibly initialize java/util/HashMap and mutate the private |
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diff
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|
3477 // static final "frontCacheEnabled" field before we start creating instances |
18
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diff
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|
3478 #ifdef ASSERT |
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3479 Klass* tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
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3480 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
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|
3481 #endif |
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3482 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
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3483 KlassHandle k = KlassHandle(THREAD, k_o); |
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3484 guarantee(k.not_null(), "Must find java/util/HashMap"); |
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3485 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
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|
3486 ik->initialize(CHECK_0); |
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|
3487 fieldDescriptor fd; |
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|
3488 // Possible we might not find this field; if so, don't break |
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|
3489 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
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3490 k()->java_mirror()->bool_field_put(fd.offset(), true); |
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3491 } |
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|
3492 } |
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|
3493 |
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|
3494 if (UseStringCache) { |
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eca19a8425b5
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diff
changeset
|
3495 // Forcibly initialize java/lang/StringValue and mutate the private |
192
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|
3496 // static final "stringCacheEnabled" field before we start creating instances |
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|
3497 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
669
eca19a8425b5
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|
3498 // Possible that StringValue isn't present: if so, silently don't break |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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diff
changeset
|
3499 if (k_o != NULL) { |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3500 KlassHandle k = KlassHandle(THREAD, k_o); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3501 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3502 ik->initialize(CHECK_0); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3503 fieldDescriptor fd; |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3504 // Possible we might not find this field: if so, silently don't break |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3505 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2302
diff
changeset
|
3506 k()->java_mirror()->bool_field_put(fd.offset(), true); |
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3507 } |
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3508 } |
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3509 } |
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3510 } |
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3511 |
0 | 3512 // Initialize java_lang.System (needed before creating the thread) |
7608 | 3513 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
3514 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); | |
3515 Handle thread_group = create_initial_thread_group(CHECK_0); | |
3516 Universe::set_main_thread_group(thread_group()); | |
3517 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); | |
3518 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); | |
3519 main_thread->set_threadObj(thread_object); | |
3520 // Set thread status to running since main thread has | |
3521 // been started and running. | |
3522 java_lang_Thread::set_thread_status(thread_object, | |
3523 java_lang_Thread::RUNNABLE); | |
3524 | |
3525 // The VM creates & returns objects of this class. Make sure it's initialized. | |
3526 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); | |
3527 | |
3528 // The VM preresolves methods to these classes. Make sure that they get initialized | |
3529 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); | |
3530 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); | |
3531 call_initializeSystemClass(CHECK_0); | |
3532 | |
3533 // get the Java runtime name after java.lang.System is initialized | |
3534 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); | |
3535 JDK_Version::set_runtime_version(get_java_runtime_version(THREAD)); | |
0 | 3536 |
3537 // an instance of OutOfMemory exception has been allocated earlier | |
7608 | 3538 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
3539 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); | |
3540 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); | |
3541 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); | |
3542 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); | |
3543 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); | |
3544 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); | |
3545 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); | |
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2376
diff
changeset
|
3546 } |
0 | 3547 |
3548 // See : bugid 4211085. | |
3549 // Background : the static initializer of java.lang.Compiler tries to read | |
3550 // property"java.compiler" and read & write property "java.vm.info". | |
3551 // When a security manager is installed through the command line | |
3552 // option "-Djava.security.manager", the above properties are not | |
3553 // readable and the static initializer for java.lang.Compiler fails | |
3554 // resulting in a NoClassDefFoundError. This can happen in any | |
3555 // user code which calls methods in java.lang.Compiler. | |
3556 // Hack : the hack is to pre-load and initialize this class, so that only | |
3557 // system domains are on the stack when the properties are read. | |
3558 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
3559 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
3560 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
3561 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
3562 // Once that is done, we should remove this hack. | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3563 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
0 | 3564 |
3565 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
3566 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
3567 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
3568 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
3569 // This should also be taken out as soon as 4211383 gets fixed. | |
3570 reset_vm_info_property(CHECK_0); | |
3571 | |
3572 quicken_jni_functions(); | |
3573 | |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3574 // Must be run after init_ft which initializes ft_enabled |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3575 if (TRACE_INITIALIZE() != JNI_OK) { |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3576 vm_exit_during_initialization("Failed to initialize tracing backend"); |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3577 } |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3578 |
0 | 3579 // Set flag that basic initialization has completed. Used by exceptions and various |
3580 // debug stuff, that does not work until all basic classes have been initialized. | |
3581 set_init_completed(); | |
3582 | |
4006 | 3583 #ifndef USDT2 |
0 | 3584 HS_DTRACE_PROBE(hotspot, vm__init__end); |
4006 | 3585 #else /* USDT2 */ |
3586 HOTSPOT_VM_INIT_END(); | |
3587 #endif /* USDT2 */ | |
0 | 3588 |
3589 // record VM initialization completion time | |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3590 #if INCLUDE_MANAGEMENT |
0 | 3591 Management::record_vm_init_completed(); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3592 #endif // INCLUDE_MANAGEMENT |
0 | 3593 |
3594 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3595 // valid exceptions may be thrown in the process. | |
3596 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3597 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3598 // anymore. We call vm_exit_during_initialization directly instead. | |
3599 SystemDictionary::compute_java_system_loader(THREAD); | |
3600 if (HAS_PENDING_EXCEPTION) { | |
3601 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3602 } | |
3603 | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3604 #if INCLUDE_ALL_GCS |
0 | 3605 // Support for ConcurrentMarkSweep. This should be cleaned up |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3606 // 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
|
3607 // once things are properly refactored. XXX YSR |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3608 if (UseConcMarkSweepGC || UseG1GC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3609 if (UseConcMarkSweepGC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3610 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3611 } else { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3612 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3613 } |
0 | 3614 if (HAS_PENDING_EXCEPTION) { |
3615 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3616 } | |
3617 } | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3618 #endif // INCLUDE_ALL_GCS |
0 | 3619 |
3620 // Always call even when there are not JVMTI environments yet, since environments | |
3621 // may be attached late and JVMTI must track phases of VM execution | |
3622 JvmtiExport::enter_live_phase(); | |
3623 | |
3624 // Signal Dispatcher needs to be started before VMInit event is posted | |
3625 os::signal_init(); | |
3626 | |
3627 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3628 if (!DisableAttachMechanism) { | |
3629 if (StartAttachListener || AttachListener::init_at_startup()) { | |
3630 AttachListener::init(); | |
3631 } | |
3632 } | |
3633 | |
3634 // Launch -Xrun agents | |
3635 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3636 // back-end can launch with -Xdebug -Xrunjdwp. | |
3637 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3638 create_vm_init_libraries(); | |
3639 } | |
3640 | |
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3641 // 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
|
3642 JvmtiExport::post_vm_initialized(); |
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3643 |
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3644 if (!TRACE_START()) { |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3645 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3646 } |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3647 |
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3648 if (CleanChunkPoolAsync) { |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3649 Chunk::start_chunk_pool_cleaner_task(); |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3650 } |
0 | 3651 |
3652 // initialize compiler(s) | |
7195 | 3653 #if defined(COMPILER1) || defined(COMPILER2) || defined(SHARK) |
0 | 3654 CompileBroker::compilation_init(); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3655 #endif |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3656 |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3657 #if INCLUDE_MANAGEMENT |
0 | 3658 Management::initialize(THREAD); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3659 #endif // INCLUDE_MANAGEMENT |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3660 |
0 | 3661 if (HAS_PENDING_EXCEPTION) { |
3662 // management agent fails to start possibly due to | |
3663 // configuration problem and is responsible for printing | |
3664 // stack trace if appropriate. Simply exit VM. | |
3665 vm_exit(1); | |
3666 } | |
3667 | |
3668 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3669 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
3670 if (MemProfiling) MemProfiler::engage(); | |
3671 StatSampler::engage(); | |
3672 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3673 | |
3674 BiasedLocking::init(); | |
3675 | |
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3676 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
|
3677 call_postVMInitHook(THREAD); |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3678 // 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
|
3679 // exceptions and provide means of diagnosis. |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3680 if (HAS_PENDING_EXCEPTION) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3681 CLEAR_PENDING_EXCEPTION; |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3682 } |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3683 } |
0 | 3684 |
6939
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3685 { |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3686 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3687 // Make sure the watcher thread can be started by WatcherThread::start() |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3688 // or by dynamic enrollment. |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3689 WatcherThread::make_startable(); |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3690 // Start up the WatcherThread if there are any periodic tasks |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3691 // NOTE: All PeriodicTasks should be registered by now. If they |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3692 // aren't, late joiners might appear to start slowly (we might |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3693 // take a while to process their first tick). |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3694 if (PeriodicTask::num_tasks() > 0) { |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3695 WatcherThread::start(); |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3696 } |
0 | 3697 } |
3698 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3699 // Give os specific code one last chance to start |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3700 os::init_3(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3701 |
0 | 3702 create_vm_timer.end(); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3703 #ifdef ASSERT |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3704 _vm_complete = true; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3705 #endif |
0 | 3706 return JNI_OK; |
3707 } | |
3708 | |
3709 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3710 extern "C" { | |
3711 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3712 } | |
3713 // Find a command line agent library and return its entry point for | |
3714 // -agentlib: -agentpath: -Xrun | |
3715 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3716 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3717 OnLoadEntry_t on_load_entry = NULL; | |
3718 void *library = agent->os_lib(); // check if we have looked it up before | |
3719 | |
3720 if (library == NULL) { | |
3721 char buffer[JVM_MAXPATHLEN]; | |
3722 char ebuf[1024]; | |
3723 const char *name = agent->name(); | |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3724 const char *msg = "Could not find agent library "; |
0 | 3725 |
3726 if (agent->is_absolute_path()) { | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3727 library = os::dll_load(name, ebuf, sizeof ebuf); |
0 | 3728 if (library == NULL) { |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3729 const char *sub_msg = " in absolute path, with error: "; |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3730 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3731 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3732 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3733 // If we can't find the agent, exit. |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3734 vm_exit_during_initialization(buf, NULL); |
6197 | 3735 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3736 } |
3737 } else { | |
3738 // Try to load the agent from the standard dll directory | |
6966
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3739 if (os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3740 name)) { |
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3741 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
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3742 } |
0 | 3743 #ifdef KERNEL |
3744 // Download instrument dll | |
3745 if (library == NULL && strcmp(name, "instrument") == 0) { | |
3746 char *props = Arguments::get_kernel_properties(); | |
3747 char *home = Arguments::get_java_home(); | |
3748 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
3749 " sun.jkernel.DownloadManager -download client_jvm"; | |
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3750 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
6197 | 3751 char *cmd = NEW_C_HEAP_ARRAY(char, length, mtThread); |
0 | 3752 jio_snprintf(cmd, length, fmt, home, props); |
3753 int status = os::fork_and_exec(cmd); | |
3754 FreeHeap(props); | |
3755 if (status == -1) { | |
3756 warning(cmd); | |
3757 vm_exit_during_initialization("fork_and_exec failed: %s", | |
3758 strerror(errno)); | |
3759 } | |
6197 | 3760 FREE_C_HEAP_ARRAY(char, cmd, mtThread); |
0 | 3761 // when this comes back the instrument.dll should be where it belongs. |
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3762 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3763 } |
3764 #endif // KERNEL | |
3765 if (library == NULL) { // Try the local directory | |
3766 char ns[1] = {0}; | |
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3767 if (os::dll_build_name(buffer, sizeof(buffer), ns, name)) { |
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3768 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
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3769 } |
0 | 3770 if (library == NULL) { |
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3771 const char *sub_msg = " on the library path, with error: "; |
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3772 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3773 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
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3774 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3775 // If we can't find the agent, exit. |
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3776 vm_exit_during_initialization(buf, NULL); |
6197 | 3777 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3778 } |
3779 } | |
3780 } | |
3781 agent->set_os_lib(library); | |
3782 } | |
3783 | |
3784 // Find the OnLoad function. | |
3785 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
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3786 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
0 | 3787 if (on_load_entry != NULL) break; |
3788 } | |
3789 return on_load_entry; | |
3790 } | |
3791 | |
3792 // Find the JVM_OnLoad entry point | |
3793 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3794 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3795 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3796 } | |
3797 | |
3798 // Find the Agent_OnLoad entry point | |
3799 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3800 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3801 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3802 } | |
3803 | |
3804 // For backwards compatibility with -Xrun | |
3805 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3806 // treated like -agentpath: | |
3807 // Must be called before agent libraries are created | |
3808 void Threads::convert_vm_init_libraries_to_agents() { | |
3809 AgentLibrary* agent; | |
3810 AgentLibrary* next; | |
3811 | |
3812 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3813 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3814 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3815 | |
3816 // If there is an JVM_OnLoad function it will get called later, | |
3817 // otherwise see if there is an Agent_OnLoad | |
3818 if (on_load_entry == NULL) { | |
3819 on_load_entry = lookup_agent_on_load(agent); | |
3820 if (on_load_entry != NULL) { | |
3821 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3822 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3823 Arguments::convert_library_to_agent(agent); | |
3824 } else { | |
3825 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3826 } | |
3827 } | |
3828 } | |
3829 } | |
3830 | |
3831 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3832 // Invokes Agent_OnLoad | |
3833 // Called very early -- before JavaThreads exist | |
3834 void Threads::create_vm_init_agents() { | |
3835 extern struct JavaVM_ main_vm; | |
3836 AgentLibrary* agent; | |
3837 | |
3838 JvmtiExport::enter_onload_phase(); | |
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3839 |
0 | 3840 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { |
3841 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3842 | |
3843 if (on_load_entry != NULL) { | |
3844 // Invoke the Agent_OnLoad function | |
3845 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3846 if (err != JNI_OK) { | |
3847 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3848 } | |
3849 } else { | |
3850 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3851 } | |
3852 } | |
3853 JvmtiExport::enter_primordial_phase(); | |
3854 } | |
3855 | |
3856 extern "C" { | |
3857 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3858 } | |
3859 | |
3860 void Threads::shutdown_vm_agents() { | |
3861 // Send any Agent_OnUnload notifications | |
3862 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
3863 extern struct JavaVM_ main_vm; | |
3864 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3865 | |
3866 // Find the Agent_OnUnload function. | |
3867 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
3868 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
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3869 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
0 | 3870 |
3871 // Invoke the Agent_OnUnload function | |
3872 if (unload_entry != NULL) { | |
3873 JavaThread* thread = JavaThread::current(); | |
3874 ThreadToNativeFromVM ttn(thread); | |
3875 HandleMark hm(thread); | |
3876 (*unload_entry)(&main_vm); | |
3877 break; | |
3878 } | |
3879 } | |
3880 } | |
3881 } | |
3882 | |
3883 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3884 // Invokes JVM_OnLoad | |
3885 void Threads::create_vm_init_libraries() { | |
3886 extern struct JavaVM_ main_vm; | |
3887 AgentLibrary* agent; | |
3888 | |
3889 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3890 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3891 | |
3892 if (on_load_entry != NULL) { | |
3893 // Invoke the JVM_OnLoad function | |
3894 JavaThread* thread = JavaThread::current(); | |
3895 ThreadToNativeFromVM ttn(thread); | |
3896 HandleMark hm(thread); | |
3897 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3898 if (err != JNI_OK) { | |
3899 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3900 } | |
3901 } else { | |
3902 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3903 } | |
3904 } | |
3905 } | |
3906 | |
3907 // Last thread running calls java.lang.Shutdown.shutdown() | |
3908 void JavaThread::invoke_shutdown_hooks() { | |
3909 HandleMark hm(this); | |
3910 | |
3911 // We could get here with a pending exception, if so clear it now. | |
3912 if (this->has_pending_exception()) { | |
3913 this->clear_pending_exception(); | |
3914 } | |
3915 | |
3916 EXCEPTION_MARK; | |
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3917 Klass* k = |
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3918 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
0 | 3919 THREAD); |
3920 if (k != NULL) { | |
3921 // SystemDictionary::resolve_or_null will return null if there was | |
3922 // an exception. If we cannot load the Shutdown class, just don't | |
3923 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3924 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3925 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3926 // was called, the Shutdown class would have already been loaded | |
3927 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3928 instanceKlassHandle shutdown_klass (THREAD, k); | |
3929 JavaValue result(T_VOID); | |
3930 JavaCalls::call_static(&result, | |
3931 shutdown_klass, | |
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3932 vmSymbols::shutdown_method_name(), |
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3933 vmSymbols::void_method_signature(), |
0 | 3934 THREAD); |
3935 } | |
3936 CLEAR_PENDING_EXCEPTION; | |
3937 } | |
3938 | |
3939 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3940 // the program falls off the end of main(). Another VM exit path is through | |
3941 // vm_exit() when the program calls System.exit() to return a value or when | |
3942 // there is a serious error in VM. The two shutdown paths are not exactly | |
3943 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3944 // and VM_Exit op at VM level. | |
3945 // | |
3946 // Shutdown sequence: | |
6197 | 3947 // + Shutdown native memory tracking if it is on |
0 | 3948 // + Wait until we are the last non-daemon thread to execute |
3949 // <-- every thing is still working at this moment --> | |
3950 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3951 // shutdown hooks, run finalizers if finalization-on-exit | |
3952 // + Call before_exit(), prepare for VM exit | |
3953 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3954 // currently the only user of this mechanism is File.deleteOnExit()) | |
3955 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3956 // post thread end and vm death events to JVMTI, | |
3957 // stop signal thread | |
3958 // + Call JavaThread::exit(), it will: | |
3959 // > release JNI handle blocks, remove stack guard pages | |
3960 // > remove this thread from Threads list | |
3961 // <-- no more Java code from this thread after this point --> | |
3962 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3963 // the compiler threads at safepoint | |
3964 // <-- do not use anything that could get blocked by Safepoint --> | |
3965 // + Disable tracing at JNI/JVM barriers | |
3966 // + Set _vm_exited flag for threads that are still running native code | |
3967 // + Delete this thread | |
3968 // + Call exit_globals() | |
3969 // > deletes tty | |
3970 // > deletes PerfMemory resources | |
3971 // + Return to caller | |
3972 | |
3973 bool Threads::destroy_vm() { | |
3974 JavaThread* thread = JavaThread::current(); | |
3975 | |
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3976 #ifdef ASSERT |
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3977 _vm_complete = false; |
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3978 #endif |
0 | 3979 // Wait until we are the last non-daemon thread to execute |
3980 { MutexLocker nu(Threads_lock); | |
3981 while (Threads::number_of_non_daemon_threads() > 1 ) | |
3982 // This wait should make safepoint checks, wait without a timeout, | |
3983 // and wait as a suspend-equivalent condition. | |
3984 // | |
3985 // Note: If the FlatProfiler is running and this thread is waiting | |
3986 // for another non-daemon thread to finish, then the FlatProfiler | |
3987 // is waiting for the external suspend request on this thread to | |
3988 // complete. wait_for_ext_suspend_completion() will eventually | |
3989 // timeout, but that takes time. Making this wait a suspend- | |
3990 // equivalent condition solves that timeout problem. | |
3991 // | |
3992 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
3993 Mutex::_as_suspend_equivalent_flag); | |
3994 } | |
3995 | |
3996 // Hang forever on exit if we are reporting an error. | |
3997 if (ShowMessageBoxOnError && is_error_reported()) { | |
3998 os::infinite_sleep(); | |
3999 } | |
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4000 os::wait_for_keypress_at_exit(); |
0 | 4001 |
4002 if (JDK_Version::is_jdk12x_version()) { | |
4003 // We are the last thread running, so check if finalizers should be run. | |
4004 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
4005 HandleMark rm(thread); | |
4006 Universe::run_finalizers_on_exit(); | |
4007 } else { | |
4008 // run Java level shutdown hooks | |
4009 thread->invoke_shutdown_hooks(); | |
4010 } | |
4011 | |
4012 before_exit(thread); | |
4013 | |
4014 thread->exit(true); | |
4015 | |
4016 // Stop VM thread. | |
4017 { | |
4018 // 4945125 The vm thread comes to a safepoint during exit. | |
4019 // GC vm_operations can get caught at the safepoint, and the | |
4020 // heap is unparseable if they are caught. Grab the Heap_lock | |
4021 // to prevent this. The GC vm_operations will not be able to | |
4022 // queue until after the vm thread is dead. | |
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4023 // After this point, we'll never emerge out of the safepoint before |
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4024 // 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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4025 // stopped; they remain inactive until the process exits. |
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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4026 // Note: some concurrent G1 threads may be running during a safepoint, |
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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4027 // 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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4028 // data structures that are not accessed by any other threads but them |
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4029 // after this point in a terminal safepoint. |
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4030 |
0 | 4031 MutexLocker ml(Heap_lock); |
4032 | |
4033 VMThread::wait_for_vm_thread_exit(); | |
4034 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
4035 VMThread::destroy(); | |
4036 } | |
4037 | |
4038 // clean up ideal graph printers | |
4039 #if defined(COMPILER2) && !defined(PRODUCT) | |
4040 IdealGraphPrinter::clean_up(); | |
4041 #endif | |
4042 | |
4043 // Now, all Java threads are gone except daemon threads. Daemon threads | |
4044 // running Java code or in VM are stopped by the Safepoint. However, | |
4045 // daemon threads executing native code are still running. But they | |
4046 // will be stopped at native=>Java/VM barriers. Note that we can't | |
4047 // simply kill or suspend them, as it is inherently deadlock-prone. | |
4048 | |
4049 #ifndef PRODUCT | |
4050 // disable function tracing at JNI/JVM barriers | |
4051 TraceJNICalls = false; | |
4052 TraceJVMCalls = false; | |
4053 TraceRuntimeCalls = false; | |
4054 #endif | |
4055 | |
4056 VM_Exit::set_vm_exited(); | |
4057 | |
4058 notify_vm_shutdown(); | |
4059 | |
4060 delete thread; | |
4061 | |
4062 // exit_globals() will delete tty | |
4063 exit_globals(); | |
4064 | |
4065 return true; | |
4066 } | |
4067 | |
4068 | |
4069 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
4070 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
4071 return is_supported_jni_version(version); | |
4072 } | |
4073 | |
4074 | |
4075 jboolean Threads::is_supported_jni_version(jint version) { | |
4076 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
4077 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
4078 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
4079 return JNI_FALSE; | |
4080 } | |
4081 | |
4082 | |
4083 void Threads::add(JavaThread* p, bool force_daemon) { | |
4084 // The threads lock must be owned at this point | |
4085 assert_locked_or_safepoint(Threads_lock); | |
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4086 |
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4087 // See the comment for this method in thread.hpp for its purpose and |
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4088 // why it is called here. |
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4089 p->initialize_queues(); |
0 | 4090 p->set_next(_thread_list); |
4091 _thread_list = p; | |
4092 _number_of_threads++; | |
4093 oop threadObj = p->threadObj(); | |
4094 bool daemon = true; | |
4095 // Bootstrapping problem: threadObj can be null for initial | |
4096 // JavaThread (or for threads attached via JNI) | |
4097 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
4098 _number_of_non_daemon_threads++; | |
4099 daemon = false; | |
4100 } | |
4101 | |
6197 | 4102 p->set_safepoint_visible(true); |
4103 | |
0 | 4104 ThreadService::add_thread(p, daemon); |
4105 | |
4106 // Possible GC point. | |
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4107 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
0 | 4108 } |
4109 | |
4110 void Threads::remove(JavaThread* p) { | |
4111 // Extra scope needed for Thread_lock, so we can check | |
4112 // that we do not remove thread without safepoint code notice | |
4113 { MutexLocker ml(Threads_lock); | |
4114 | |
4115 assert(includes(p), "p must be present"); | |
4116 | |
4117 JavaThread* current = _thread_list; | |
4118 JavaThread* prev = NULL; | |
4119 | |
4120 while (current != p) { | |
4121 prev = current; | |
4122 current = current->next(); | |
4123 } | |
4124 | |
4125 if (prev) { | |
4126 prev->set_next(current->next()); | |
4127 } else { | |
4128 _thread_list = p->next(); | |
4129 } | |
4130 _number_of_threads--; | |
4131 oop threadObj = p->threadObj(); | |
4132 bool daemon = true; | |
4133 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
4134 _number_of_non_daemon_threads--; | |
4135 daemon = false; | |
4136 | |
4137 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
4138 // on destroy_vm will wake up. | |
4139 if (number_of_non_daemon_threads() == 1) | |
4140 Threads_lock->notify_all(); | |
4141 } | |
4142 ThreadService::remove_thread(p, daemon); | |
4143 | |
4144 // Make sure that safepoint code disregard this thread. This is needed since | |
4145 // the thread might mess around with locks after this point. This can cause it | |
4146 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
4147 // of this thread since it is removed from the queue. | |
4148 p->set_terminated_value(); | |
6197 | 4149 |
4150 // Now, this thread is not visible to safepoint | |
4151 p->set_safepoint_visible(false); | |
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4152 // once the thread becomes safepoint invisible, we can not use its per-thread |
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4153 // recorder. And Threads::do_threads() no longer walks this thread, so we have |
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4154 // to release its per-thread recorder here. |
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4155 MemTracker::thread_exiting(p); |
0 | 4156 } // unlock Threads_lock |
4157 | |
4158 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
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4159 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
0 | 4160 } |
4161 | |
4162 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
4163 bool Threads::includes(JavaThread* p) { | |
4164 assert(Threads_lock->is_locked(), "sanity check"); | |
4165 ALL_JAVA_THREADS(q) { | |
4166 if (q == p ) { | |
4167 return true; | |
4168 } | |
4169 } | |
4170 return false; | |
4171 } | |
4172 | |
4173 // Operations on the Threads list for GC. These are not explicitly locked, | |
4174 // but the garbage collector must provide a safe context for them to run. | |
4175 // In particular, these things should never be called when the Threads_lock | |
4176 // is held by some other thread. (Note: the Safepoint abstraction also | |
4177 // uses the Threads_lock to gurantee this property. It also makes sure that | |
4178 // all threads gets blocked when exiting or starting). | |
4179 | |
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4180 void Threads::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
0 | 4181 ALL_JAVA_THREADS(p) { |
7179
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4182 p->oops_do(f, cld_f, cf); |
0 | 4183 } |
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4184 VMThread::vm_thread()->oops_do(f, cld_f, cf); |
0 | 4185 } |
4186 | |
7179
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4187 void Threads::possibly_parallel_oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
0 | 4188 // Introduce a mechanism allowing parallel threads to claim threads as |
4189 // root groups. Overhead should be small enough to use all the time, | |
4190 // even in sequential code. | |
4191 SharedHeap* sh = SharedHeap::heap(); | |
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4192 // Cannot yet substitute active_workers for n_par_threads |
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4193 // because of G1CollectedHeap::verify() use of |
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4194 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
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4195 // turn off parallelism in process_strong_roots while active_workers |
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4196 // is being used for parallelism elsewhere. |
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4197 bool is_par = sh->n_par_threads() > 0; |
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4198 assert(!is_par || |
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4199 (SharedHeap::heap()->n_par_threads() == |
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4200 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
0 | 4201 int cp = SharedHeap::heap()->strong_roots_parity(); |
4202 ALL_JAVA_THREADS(p) { | |
4203 if (p->claim_oops_do(is_par, cp)) { | |
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4204 p->oops_do(f, cld_f, cf); |
0 | 4205 } |
4206 } | |
4207 VMThread* vmt = VMThread::vm_thread(); | |
3979
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4208 if (vmt->claim_oops_do(is_par, cp)) { |
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4209 vmt->oops_do(f, cld_f, cf); |
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4210 } |
0 | 4211 } |
4212 | |
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4213 #if INCLUDE_ALL_GCS |
0 | 4214 // Used by ParallelScavenge |
4215 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
4216 ALL_JAVA_THREADS(p) { | |
4217 q->enqueue(new ThreadRootsTask(p)); | |
4218 } | |
4219 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
4220 } | |
4221 | |
4222 // Used by Parallel Old | |
4223 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
4224 ALL_JAVA_THREADS(p) { | |
4225 q->enqueue(new ThreadRootsMarkingTask(p)); | |
4226 } | |
4227 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
4228 } | |
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4229 #endif // INCLUDE_ALL_GCS |
0 | 4230 |
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4231 void Threads::nmethods_do(CodeBlobClosure* cf) { |
0 | 4232 ALL_JAVA_THREADS(p) { |
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4233 p->nmethods_do(cf); |
0 | 4234 } |
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4235 VMThread::vm_thread()->nmethods_do(cf); |
0 | 4236 } |
4237 | |
6725
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4238 void Threads::metadata_do(void f(Metadata*)) { |
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4239 ALL_JAVA_THREADS(p) { |
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4240 p->metadata_do(f); |
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4241 } |
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4242 } |
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4243 |
0 | 4244 void Threads::gc_epilogue() { |
4245 ALL_JAVA_THREADS(p) { | |
4246 p->gc_epilogue(); | |
4247 } | |
4248 } | |
4249 | |
4250 void Threads::gc_prologue() { | |
4251 ALL_JAVA_THREADS(p) { | |
4252 p->gc_prologue(); | |
4253 } | |
4254 } | |
4255 | |
4256 void Threads::deoptimized_wrt_marked_nmethods() { | |
4257 ALL_JAVA_THREADS(p) { | |
4258 p->deoptimized_wrt_marked_nmethods(); | |
4259 } | |
4260 } | |
4261 | |
4262 | |
4263 // Get count Java threads that are waiting to enter the specified monitor. | |
4264 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
4265 address monitor, bool doLock) { | |
4266 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
4267 "must grab Threads_lock or be at safepoint"); | |
4268 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
4269 | |
4270 int i = 0; | |
4271 { | |
4272 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4273 ALL_JAVA_THREADS(p) { | |
4274 if (p->is_Compiler_thread()) continue; | |
4275 | |
4276 address pending = (address)p->current_pending_monitor(); | |
4277 if (pending == monitor) { // found a match | |
4278 if (i < count) result->append(p); // save the first count matches | |
4279 i++; | |
4280 } | |
4281 } | |
4282 } | |
4283 return result; | |
4284 } | |
4285 | |
4286 | |
4287 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
4288 assert(doLock || | |
4289 Threads_lock->owned_by_self() || | |
4290 SafepointSynchronize::is_at_safepoint(), | |
4291 "must grab Threads_lock or be at safepoint"); | |
4292 | |
4293 // NULL owner means not locked so we can skip the search | |
4294 if (owner == NULL) return NULL; | |
4295 | |
4296 { | |
4297 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4298 ALL_JAVA_THREADS(p) { | |
4299 // first, see if owner is the address of a Java thread | |
4300 if (owner == (address)p) return p; | |
4301 } | |
4302 } | |
4303 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
4304 if (UseHeavyMonitors) return NULL; | |
4305 | |
4306 // | |
4307 // If we didn't find a matching Java thread and we didn't force use of | |
4308 // heavyweight monitors, then the owner is the stack address of the | |
4309 // Lock Word in the owning Java thread's stack. | |
4310 // | |
4311 JavaThread* the_owner = NULL; | |
4312 { | |
4313 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4314 ALL_JAVA_THREADS(q) { | |
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4315 if (q->is_lock_owned(owner)) { |
0 | 4316 the_owner = q; |
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4317 break; |
0 | 4318 } |
4319 } | |
4320 } | |
4321 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
4322 return the_owner; | |
4323 } | |
4324 | |
4325 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
4326 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
4327 char buf[32]; | |
4328 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
4329 | |
4330 st->print_cr("Full thread dump %s (%s %s):", | |
4331 Abstract_VM_Version::vm_name(), | |
4332 Abstract_VM_Version::vm_release(), | |
4333 Abstract_VM_Version::vm_info_string() | |
4334 ); | |
4335 st->cr(); | |
4336 | |
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|
4337 #if INCLUDE_ALL_GCS |
0 | 4338 // Dump concurrent locks |
4339 ConcurrentLocksDump concurrent_locks; | |
4340 if (print_concurrent_locks) { | |
4341 concurrent_locks.dump_at_safepoint(); | |
4342 } | |
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4343 #endif // INCLUDE_ALL_GCS |
0 | 4344 |
4345 ALL_JAVA_THREADS(p) { | |
4346 ResourceMark rm; | |
4347 p->print_on(st); | |
4348 if (print_stacks) { | |
4349 if (internal_format) { | |
4350 p->trace_stack(); | |
4351 } else { | |
4352 p->print_stack_on(st); | |
4353 } | |
4354 } | |
4355 st->cr(); | |
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|
4356 #if INCLUDE_ALL_GCS |
0 | 4357 if (print_concurrent_locks) { |
4358 concurrent_locks.print_locks_on(p, st); | |
4359 } | |
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4360 #endif // INCLUDE_ALL_GCS |
0 | 4361 } |
4362 | |
4363 VMThread::vm_thread()->print_on(st); | |
4364 st->cr(); | |
4365 Universe::heap()->print_gc_threads_on(st); | |
4366 WatcherThread* wt = WatcherThread::watcher_thread(); | |
6766 | 4367 if (wt != NULL) { |
4368 wt->print_on(st); | |
4369 st->cr(); | |
4370 } | |
0 | 4371 CompileBroker::print_compiler_threads_on(st); |
4372 st->flush(); | |
4373 } | |
4374 | |
4375 // Threads::print_on_error() is called by fatal error handler. It's possible | |
4376 // that VM is not at safepoint and/or current thread is inside signal handler. | |
4377 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
4378 // memory (even in resource area), it might deadlock the error handler. | |
4379 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
4380 bool found_current = false; | |
4381 st->print_cr("Java Threads: ( => current thread )"); | |
4382 ALL_JAVA_THREADS(thread) { | |
4383 bool is_current = (current == thread); | |
4384 found_current = found_current || is_current; | |
4385 | |
4386 st->print("%s", is_current ? "=>" : " "); | |
4387 | |
4388 st->print(PTR_FORMAT, thread); | |
4389 st->print(" "); | |
4390 thread->print_on_error(st, buf, buflen); | |
4391 st->cr(); | |
4392 } | |
4393 st->cr(); | |
4394 | |
4395 st->print_cr("Other Threads:"); | |
4396 if (VMThread::vm_thread()) { | |
4397 bool is_current = (current == VMThread::vm_thread()); | |
4398 found_current = found_current || is_current; | |
4399 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
4400 | |
4401 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
4402 st->print(" "); | |
4403 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
4404 st->cr(); | |
4405 } | |
4406 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4407 if (wt != NULL) { | |
4408 bool is_current = (current == wt); | |
4409 found_current = found_current || is_current; | |
4410 st->print("%s", is_current ? "=>" : " "); | |
4411 | |
4412 st->print(PTR_FORMAT, wt); | |
4413 st->print(" "); | |
4414 wt->print_on_error(st, buf, buflen); | |
4415 st->cr(); | |
4416 } | |
4417 if (!found_current) { | |
4418 st->cr(); | |
4419 st->print("=>" PTR_FORMAT " (exited) ", current); | |
4420 current->print_on_error(st, buf, buflen); | |
4421 st->cr(); | |
4422 } | |
4423 } | |
4424 | |
1878 | 4425 // Internal SpinLock and Mutex |
4426 // Based on ParkEvent | |
4427 | |
4428 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
0 | 4429 // |
1878 | 4430 // We employ SpinLocks _only for low-contention, fixed-length |
4431 // short-duration critical sections where we're concerned | |
4432 // about native mutex_t or HotSpot Mutex:: latency. | |
4433 // The mux construct provides a spin-then-block mutual exclusion | |
4434 // mechanism. | |
4435 // | |
4436 // Testing has shown that contention on the ListLock guarding gFreeList | |
4437 // is common. If we implement ListLock as a simple SpinLock it's common | |
4438 // for the JVM to devolve to yielding with little progress. This is true | |
4439 // despite the fact that the critical sections protected by ListLock are | |
4440 // extremely short. | |
0 | 4441 // |
1878 | 4442 // TODO-FIXME: ListLock should be of type SpinLock. |
4443 // We should make this a 1st-class type, integrated into the lock | |
4444 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
4445 // should have sufficient padding to avoid false-sharing and excessive | |
4446 // cache-coherency traffic. | |
4447 | |
4448 | |
4449 typedef volatile int SpinLockT ; | |
4450 | |
4451 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
4452 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
4453 return ; // normal fast-path return | |
4454 } | |
4455 | |
4456 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
4457 TEVENT (SpinAcquire - ctx) ; | |
4458 int ctr = 0 ; | |
4459 int Yields = 0 ; | |
0 | 4460 for (;;) { |
1878 | 4461 while (*adr != 0) { |
4462 ++ctr ; | |
4463 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
4464 if (Yields > 5) { | |
4465 // Consider using a simple NakedSleep() instead. | |
4466 // Then SpinAcquire could be called by non-JVM threads | |
4467 Thread::current()->_ParkEvent->park(1) ; | |
4468 } else { | |
4469 os::NakedYield() ; | |
4470 ++Yields ; | |
4471 } | |
4472 } else { | |
4473 SpinPause() ; | |
0 | 4474 } |
1878 | 4475 } |
4476 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
0 | 4477 } |
4478 } | |
4479 | |
1878 | 4480 void Thread::SpinRelease (volatile int * adr) { |
4481 assert (*adr != 0, "invariant") ; | |
4482 OrderAccess::fence() ; // guarantee at least release consistency. | |
4483 // Roach-motel semantics. | |
4484 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
4485 // but prior LDs and STs within the critical section can't be allowed | |
4486 // to reorder or float past the ST that releases the lock. | |
4487 *adr = 0 ; | |
0 | 4488 } |
4489 | |
1878 | 4490 // muxAcquire and muxRelease: |
4491 // | |
4492 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
4493 // The LSB of the word is set IFF the lock is held. | |
4494 // The remainder of the word points to the head of a singly-linked list | |
4495 // of threads blocked on the lock. | |
4496 // | |
4497 // * The current implementation of muxAcquire-muxRelease uses its own | |
4498 // dedicated Thread._MuxEvent instance. If we're interested in | |
4499 // minimizing the peak number of extant ParkEvent instances then | |
4500 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
4501 // as certain invariants were satisfied. Specifically, care would need | |
4502 // to be taken with regards to consuming unpark() "permits". | |
4503 // A safe rule of thumb is that a thread would never call muxAcquire() | |
4504 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
4505 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
4506 // consume an unpark() permit intended for monitorenter, for instance. | |
4507 // One way around this would be to widen the restricted-range semaphore | |
4508 // implemented in park(). Another alternative would be to provide | |
4509 // multiple instances of the PlatformEvent() for each thread. One | |
4510 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
4511 // | |
4512 // * Usage: | |
4513 // -- Only as leaf locks | |
4514 // -- for short-term locking only as muxAcquire does not perform | |
4515 // thread state transitions. | |
4516 // | |
4517 // Alternatives: | |
4518 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
4519 // but with parking or spin-then-park instead of pure spinning. | |
4520 // * Use Taura-Oyama-Yonenzawa locks. | |
4521 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
4522 // (List,LockByte). Acquire will CAS the full lockword while Release | |
4523 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
4524 // acquiring threads use timers (ParkTimed) to detect and recover from | |
4525 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
4526 // boundaries by using placement-new. | |
4527 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
4528 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
4529 // The validity of the backlinks must be ratified before we trust the value. | |
4530 // If the backlinks are invalid the exiting thread must back-track through the | |
4531 // the forward links, which are always trustworthy. | |
4532 // * Add a successor indication. The LockWord is currently encoded as | |
4533 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
4534 // to provide the usual futile-wakeup optimization. | |
4535 // See RTStt for details. | |
4536 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
4537 // | |
4538 | |
4539 | |
4540 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
4541 enum MuxBits { LOCKBIT = 1 } ; | |
4542 | |
4543 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
4544 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4545 if (w == 0) return ; | |
4546 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4547 return ; | |
4548 } | |
4549 | |
4550 TEVENT (muxAcquire - Contention) ; | |
4551 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
4552 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
0 | 4553 for (;;) { |
1878 | 4554 int its = (os::is_MP() ? 100 : 0) + 1 ; |
4555 | |
4556 // Optional spin phase: spin-then-park strategy | |
4557 while (--its >= 0) { | |
4558 w = *Lock ; | |
4559 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4560 return ; | |
4561 } | |
4562 } | |
4563 | |
4564 Self->reset() ; | |
4565 Self->OnList = intptr_t(Lock) ; | |
4566 // The following fence() isn't _strictly necessary as the subsequent | |
4567 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4568 OrderAccess::fence(); | |
4569 for (;;) { | |
4570 w = *Lock ; | |
4571 if ((w & LOCKBIT) == 0) { | |
4572 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4573 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
4574 return ; | |
4575 } | |
4576 continue ; // Interference -- *Lock changed -- Just retry | |
0 | 4577 } |
1878 | 4578 assert (w & LOCKBIT, "invariant") ; |
4579 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4580 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
4581 } | |
4582 | |
4583 while (Self->OnList != 0) { | |
4584 Self->park() ; | |
4585 } | |
0 | 4586 } |
4587 } | |
4588 | |
1878 | 4589 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
4590 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4591 if (w == 0) return ; | |
4592 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4593 return ; | |
4594 } | |
4595 | |
4596 TEVENT (muxAcquire - Contention) ; | |
4597 ParkEvent * ReleaseAfter = NULL ; | |
4598 if (ev == NULL) { | |
4599 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
4600 } | |
4601 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
4602 for (;;) { | |
4603 guarantee (ev->OnList == 0, "invariant") ; | |
4604 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
4605 | |
4606 // Optional spin phase: spin-then-park strategy | |
4607 while (--its >= 0) { | |
4608 w = *Lock ; | |
4609 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4610 if (ReleaseAfter != NULL) { | |
4611 ParkEvent::Release (ReleaseAfter) ; | |
4612 } | |
4613 return ; | |
4614 } | |
4615 } | |
4616 | |
4617 ev->reset() ; | |
4618 ev->OnList = intptr_t(Lock) ; | |
4619 // The following fence() isn't _strictly necessary as the subsequent | |
4620 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4621 OrderAccess::fence(); | |
4622 for (;;) { | |
4623 w = *Lock ; | |
4624 if ((w & LOCKBIT) == 0) { | |
4625 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4626 ev->OnList = 0 ; | |
4627 // We call ::Release while holding the outer lock, thus | |
4628 // artificially lengthening the critical section. | |
4629 // Consider deferring the ::Release() until the subsequent unlock(), | |
4630 // after we've dropped the outer lock. | |
4631 if (ReleaseAfter != NULL) { | |
4632 ParkEvent::Release (ReleaseAfter) ; | |
4633 } | |
4634 return ; | |
4635 } | |
4636 continue ; // Interference -- *Lock changed -- Just retry | |
4637 } | |
4638 assert (w & LOCKBIT, "invariant") ; | |
4639 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4640 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
4641 } | |
4642 | |
4643 while (ev->OnList != 0) { | |
4644 ev->park() ; | |
4645 } | |
4646 } | |
4647 } | |
4648 | |
4649 // Release() must extract a successor from the list and then wake that thread. | |
4650 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
4651 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
4652 // Release() would : | |
4653 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
4654 // (B) Extract a successor from the private list "in-hand" | |
4655 // (C) attempt to CAS() the residual back into *Lock over null. | |
4656 // If there were any newly arrived threads and the CAS() would fail. | |
4657 // In that case Release() would detach the RATs, re-merge the list in-hand | |
4658 // with the RATs and repeat as needed. Alternately, Release() might | |
4659 // detach and extract a successor, but then pass the residual list to the wakee. | |
4660 // The wakee would be responsible for reattaching and remerging before it | |
4661 // competed for the lock. | |
4662 // | |
4663 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
4664 // multiple concurrent pushers, but only one popper or detacher. | |
4665 // This implementation pops from the head of the list. This is unfair, | |
4666 // but tends to provide excellent throughput as hot threads remain hot. | |
4667 // (We wake recently run threads first). | |
4668 | |
4669 void Thread::muxRelease (volatile intptr_t * Lock) { | |
4670 for (;;) { | |
4671 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
4672 assert (w & LOCKBIT, "invariant") ; | |
4673 if (w == LOCKBIT) return ; | |
4674 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
4675 assert (List != NULL, "invariant") ; | |
4676 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
4677 ParkEvent * nxt = List->ListNext ; | |
4678 | |
4679 // The following CAS() releases the lock and pops the head element. | |
4680 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
4681 continue ; | |
4682 } | |
4683 List->OnList = 0 ; | |
4684 OrderAccess::fence() ; | |
4685 List->unpark () ; | |
4686 return ; | |
4687 } | |
4688 } | |
4689 | |
4690 | |
0 | 4691 void Threads::verify() { |
4692 ALL_JAVA_THREADS(p) { | |
4693 p->verify(); | |
4694 } | |
4695 VMThread* thread = VMThread::vm_thread(); | |
4696 if (thread != NULL) thread->verify(); | |
4697 } |