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annotate src/share/vm/runtime/thread.cpp @ 14816:836d558c3a5f
Create Baseline version of doBlock in LIRGenerator.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Wed, 19 Mar 2014 15:14:37 +0100 |
parents | d8041d695d19 |
children | b51e29501f30 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "code/scopeDesc.hpp" | |
31 #include "compiler/compileBroker.hpp" | |
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32 #ifdef GRAAL |
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33 #include "graal/graalCompiler.hpp" |
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34 #endif |
1972 | 35 #include "interpreter/interpreter.hpp" |
36 #include "interpreter/linkResolver.hpp" | |
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37 #include "interpreter/oopMapCache.hpp" |
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38 #include "jvmtifiles/jvmtiEnv.hpp" |
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39 #include "memory/gcLocker.inline.hpp" |
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40 #include "memory/metaspaceShared.hpp" |
1972 | 41 #include "memory/oopFactory.hpp" |
42 #include "memory/universe.inline.hpp" | |
43 #include "oops/instanceKlass.hpp" | |
44 #include "oops/objArrayOop.hpp" | |
45 #include "oops/oop.inline.hpp" | |
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46 #include "oops/symbol.hpp" |
1972 | 47 #include "prims/jvm_misc.hpp" |
48 #include "prims/jvmtiExport.hpp" | |
49 #include "prims/jvmtiThreadState.hpp" | |
50 #include "prims/privilegedStack.hpp" | |
51 #include "runtime/arguments.hpp" | |
52 #include "runtime/biasedLocking.hpp" | |
53 #include "runtime/deoptimization.hpp" | |
54 #include "runtime/fprofiler.hpp" | |
55 #include "runtime/frame.inline.hpp" | |
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56 #include "runtime/gpu.hpp" |
1972 | 57 #include "runtime/init.hpp" |
58 #include "runtime/interfaceSupport.hpp" | |
59 #include "runtime/java.hpp" | |
60 #include "runtime/javaCalls.hpp" | |
61 #include "runtime/jniPeriodicChecker.hpp" | |
62 #include "runtime/memprofiler.hpp" | |
63 #include "runtime/mutexLocker.hpp" | |
64 #include "runtime/objectMonitor.hpp" | |
65 #include "runtime/osThread.hpp" | |
66 #include "runtime/safepoint.hpp" | |
67 #include "runtime/sharedRuntime.hpp" | |
68 #include "runtime/statSampler.hpp" | |
69 #include "runtime/stubRoutines.hpp" | |
70 #include "runtime/task.hpp" | |
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71 #include "runtime/thread.inline.hpp" |
1972 | 72 #include "runtime/threadCritical.hpp" |
73 #include "runtime/threadLocalStorage.hpp" | |
74 #include "runtime/vframe.hpp" | |
75 #include "runtime/vframeArray.hpp" | |
76 #include "runtime/vframe_hp.hpp" | |
77 #include "runtime/vmThread.hpp" | |
78 #include "runtime/vm_operations.hpp" | |
79 #include "services/attachListener.hpp" | |
80 #include "services/management.hpp" | |
6197 | 81 #include "services/memTracker.hpp" |
1972 | 82 #include "services/threadService.hpp" |
10405 | 83 #include "trace/tracing.hpp" |
84 #include "trace/traceMacros.hpp" | |
1972 | 85 #include "utilities/defaultStream.hpp" |
86 #include "utilities/dtrace.hpp" | |
87 #include "utilities/events.hpp" | |
88 #include "utilities/preserveException.hpp" | |
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89 #include "utilities/macros.hpp" |
1972 | 90 #ifdef TARGET_OS_FAMILY_linux |
91 # include "os_linux.inline.hpp" | |
92 #endif | |
93 #ifdef TARGET_OS_FAMILY_solaris | |
94 # include "os_solaris.inline.hpp" | |
95 #endif | |
96 #ifdef TARGET_OS_FAMILY_windows | |
97 # include "os_windows.inline.hpp" | |
98 #endif | |
3960 | 99 #ifdef TARGET_OS_FAMILY_bsd |
100 # include "os_bsd.inline.hpp" | |
101 #endif | |
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102 #if INCLUDE_ALL_GCS |
1972 | 103 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" |
104 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
105 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
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106 #endif // INCLUDE_ALL_GCS |
1972 | 107 #ifdef COMPILER1 |
108 #include "c1/c1_Compiler.hpp" | |
109 #endif | |
110 #ifdef COMPILER2 | |
111 #include "opto/c2compiler.hpp" | |
112 #include "opto/idealGraphPrinter.hpp" | |
113 #endif | |
0 | 114 |
115 #ifdef DTRACE_ENABLED | |
116 | |
117 // Only bother with this argument setup if dtrace is available | |
118 | |
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119 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_START |
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120 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_STOP |
4006 | 121 |
122 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
123 { \ | |
124 ResourceMark rm(this); \ | |
125 int len = 0; \ | |
126 const char* name = (javathread)->get_thread_name(); \ | |
127 len = strlen(name); \ | |
128 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
129 (char *) name, len, \ | |
130 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
131 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
132 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
133 } | |
134 | |
0 | 135 #else // ndef DTRACE_ENABLED |
136 | |
137 #define DTRACE_THREAD_PROBE(probe, javathread) | |
138 | |
139 #endif // ndef DTRACE_ENABLED | |
140 | |
6197 | 141 |
0 | 142 // Class hierarchy |
143 // - Thread | |
144 // - VMThread | |
145 // - WatcherThread | |
146 // - ConcurrentMarkSweepThread | |
147 // - JavaThread | |
148 // - CompilerThread | |
149 | |
150 // ======= Thread ======== | |
151 // Support for forcing alignment of thread objects for biased locking | |
6197 | 152 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
0 | 153 if (UseBiasedLocking) { |
154 const int alignment = markOopDesc::biased_lock_alignment; | |
155 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
6197 | 156 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
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157 : AllocateHeap(aligned_size, flags, CURRENT_PC, |
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158 AllocFailStrategy::RETURN_NULL); |
0 | 159 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
160 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
161 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
162 "JavaThread alignment code overflowed allocated storage"); | |
163 if (TraceBiasedLocking) { | |
164 if (aligned_addr != real_malloc_addr) | |
165 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
166 real_malloc_addr, aligned_addr); | |
167 } | |
168 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
169 return aligned_addr; | |
170 } else { | |
6197 | 171 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
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172 : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL); |
0 | 173 } |
174 } | |
175 | |
176 void Thread::operator delete(void* p) { | |
177 if (UseBiasedLocking) { | |
178 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
6197 | 179 FreeHeap(real_malloc_addr, mtThread); |
0 | 180 } else { |
6197 | 181 FreeHeap(p, mtThread); |
0 | 182 } |
183 } | |
184 | |
185 | |
186 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
187 // JavaThread | |
188 | |
189 | |
190 Thread::Thread() { | |
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191 // stack and get_thread |
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192 set_stack_base(NULL); |
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193 set_stack_size(0); |
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194 set_self_raw_id(0); |
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195 set_lgrp_id(-1); |
0 | 196 |
197 // allocated data structures | |
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198 set_osthread(NULL); |
6197 | 199 set_resource_area(new (mtThread)ResourceArea()); |
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200 DEBUG_ONLY(_current_resource_mark = NULL;) |
6197 | 201 set_handle_area(new (mtThread) HandleArea(NULL)); |
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202 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(30, true)); |
0 | 203 set_active_handles(NULL); |
204 set_free_handle_block(NULL); | |
205 set_last_handle_mark(NULL); | |
206 | |
207 // This initial value ==> never claimed. | |
208 _oops_do_parity = 0; | |
209 | |
210 // the handle mark links itself to last_handle_mark | |
10135 | 211 new HandleMark(this); |
212 | |
0 | 213 // plain initialization |
214 debug_only(_owned_locks = NULL;) | |
215 debug_only(_allow_allocation_count = 0;) | |
216 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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217 NOT_PRODUCT(_skip_gcalot = false;) |
0 | 218 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
219 _jvmti_env_iteration_count = 0; | |
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220 set_allocated_bytes(0); |
0 | 221 _vm_operation_started_count = 0; |
222 _vm_operation_completed_count = 0; | |
223 _current_pending_monitor = NULL; | |
224 _current_pending_monitor_is_from_java = true; | |
225 _current_waiting_monitor = NULL; | |
226 _num_nested_signal = 0; | |
227 omFreeList = NULL ; | |
228 omFreeCount = 0 ; | |
229 omFreeProvision = 32 ; | |
1587 | 230 omInUseList = NULL ; |
231 omInUseCount = 0 ; | |
0 | 232 |
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233 #ifdef ASSERT |
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234 _visited_for_critical_count = false; |
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235 #endif |
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236 |
0 | 237 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
238 _suspend_flags = 0; | |
239 | |
240 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
241 _hashStateX = os::random() ; | |
242 _hashStateY = 842502087 ; | |
243 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
244 _hashStateW = 273326509 ; | |
245 | |
246 _OnTrap = 0 ; | |
247 _schedctl = NULL ; | |
248 _Stalled = 0 ; | |
249 _TypeTag = 0x2BAD ; | |
250 | |
251 // Many of the following fields are effectively final - immutable | |
252 // Note that nascent threads can't use the Native Monitor-Mutex | |
253 // construct until the _MutexEvent is initialized ... | |
254 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
255 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
256 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
257 // and ::Release() | |
258 _ParkEvent = ParkEvent::Allocate (this) ; | |
259 _SleepEvent = ParkEvent::Allocate (this) ; | |
260 _MutexEvent = ParkEvent::Allocate (this) ; | |
261 _MuxEvent = ParkEvent::Allocate (this) ; | |
262 | |
263 #ifdef CHECK_UNHANDLED_OOPS | |
264 if (CheckUnhandledOops) { | |
265 _unhandled_oops = new UnhandledOops(this); | |
266 } | |
267 #endif // CHECK_UNHANDLED_OOPS | |
268 #ifdef ASSERT | |
269 if (UseBiasedLocking) { | |
270 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
271 assert(this == _real_malloc_address || | |
272 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
273 "bug in forced alignment of thread objects"); | |
274 } | |
275 #endif /* ASSERT */ | |
276 } | |
277 | |
278 void Thread::initialize_thread_local_storage() { | |
279 // Note: Make sure this method only calls | |
280 // non-blocking operations. Otherwise, it might not work | |
281 // with the thread-startup/safepoint interaction. | |
282 | |
283 // During Java thread startup, safepoint code should allow this | |
284 // method to complete because it may need to allocate memory to | |
285 // store information for the new thread. | |
286 | |
287 // initialize structure dependent on thread local storage | |
288 ThreadLocalStorage::set_thread(this); | |
289 } | |
290 | |
291 void Thread::record_stack_base_and_size() { | |
292 set_stack_base(os::current_stack_base()); | |
293 set_stack_size(os::current_stack_size()); | |
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294 if (is_Java_thread()) { |
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295 ((JavaThread*) this)->set_stack_overflow_limit(); |
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296 } |
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297 // CR 7190089: on Solaris, primordial thread's stack is adjusted |
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298 // in initialize_thread(). Without the adjustment, stack size is |
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299 // incorrect if stack is set to unlimited (ulimit -s unlimited). |
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300 // So far, only Solaris has real implementation of initialize_thread(). |
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301 // |
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302 // set up any platform-specific state. |
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303 os::initialize_thread(this); |
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304 |
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305 #if INCLUDE_NMT |
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306 // record thread's native stack, stack grows downward |
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307 address stack_low_addr = stack_base() - stack_size(); |
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308 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, |
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309 CURRENT_PC); |
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310 #endif // INCLUDE_NMT |
0 | 311 } |
312 | |
313 | |
314 Thread::~Thread() { | |
315 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
316 ObjectSynchronizer::omFlush (this) ; | |
317 | |
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318 EVENT_THREAD_DESTRUCT(this); |
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319 |
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320 // stack_base can be NULL if the thread is never started or exited before |
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321 // record_stack_base_and_size called. Although, we would like to ensure |
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322 // that all started threads do call record_stack_base_and_size(), there is |
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323 // not proper way to enforce that. |
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324 #if INCLUDE_NMT |
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325 if (_stack_base != NULL) { |
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326 address low_stack_addr = stack_base() - stack_size(); |
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327 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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328 #ifdef ASSERT |
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329 set_stack_base(NULL); |
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330 #endif |
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331 } |
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332 #endif // INCLUDE_NMT |
6197 | 333 |
0 | 334 // deallocate data structures |
335 delete resource_area(); | |
336 // since the handle marks are using the handle area, we have to deallocated the root | |
337 // handle mark before deallocating the thread's handle area, | |
338 assert(last_handle_mark() != NULL, "check we have an element"); | |
10135 | 339 delete last_handle_mark(); |
340 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
0 | 341 |
342 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
343 // We NULL out the fields for good hygiene. | |
344 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
345 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
346 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
347 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
348 | |
349 delete handle_area(); | |
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350 delete metadata_handles(); |
0 | 351 |
352 // osthread() can be NULL, if creation of thread failed. | |
353 if (osthread() != NULL) os::free_thread(osthread()); | |
354 | |
355 delete _SR_lock; | |
356 | |
357 // clear thread local storage if the Thread is deleting itself | |
358 if (this == Thread::current()) { | |
359 ThreadLocalStorage::set_thread(NULL); | |
360 } else { | |
361 // In the case where we're not the current thread, invalidate all the | |
362 // caches in case some code tries to get the current thread or the | |
363 // thread that was destroyed, and gets stale information. | |
364 ThreadLocalStorage::invalidate_all(); | |
365 } | |
366 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
367 } | |
368 | |
369 // NOTE: dummy function for assertion purpose. | |
370 void Thread::run() { | |
371 ShouldNotReachHere(); | |
372 } | |
373 | |
374 #ifdef ASSERT | |
375 // Private method to check for dangling thread pointer | |
376 void check_for_dangling_thread_pointer(Thread *thread) { | |
377 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
378 "possibility of dangling Thread pointer"); | |
379 } | |
380 #endif | |
381 | |
382 | |
383 #ifndef PRODUCT | |
384 // Tracing method for basic thread operations | |
385 void Thread::trace(const char* msg, const Thread* const thread) { | |
386 if (!TraceThreadEvents) return; | |
387 ResourceMark rm; | |
388 ThreadCritical tc; | |
389 const char *name = "non-Java thread"; | |
390 int prio = -1; | |
391 if (thread->is_Java_thread() | |
392 && !thread->is_Compiler_thread()) { | |
393 // The Threads_lock must be held to get information about | |
394 // this thread but may not be in some situations when | |
395 // tracing thread events. | |
396 bool release_Threads_lock = false; | |
397 if (!Threads_lock->owned_by_self()) { | |
398 Threads_lock->lock(); | |
399 release_Threads_lock = true; | |
400 } | |
401 JavaThread* jt = (JavaThread *)thread; | |
402 name = (char *)jt->get_thread_name(); | |
403 oop thread_oop = jt->threadObj(); | |
404 if (thread_oop != NULL) { | |
405 prio = java_lang_Thread::priority(thread_oop); | |
406 } | |
407 if (release_Threads_lock) { | |
408 Threads_lock->unlock(); | |
409 } | |
410 } | |
411 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
412 } | |
413 #endif | |
414 | |
415 | |
416 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
417 trace("get priority", thread); | |
418 ThreadPriority priority; | |
419 // Can return an error! | |
420 (void)os::get_priority(thread, priority); | |
421 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
422 return priority; | |
423 } | |
424 | |
425 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
426 trace("set priority", thread); | |
427 debug_only(check_for_dangling_thread_pointer(thread);) | |
428 // Can return an error! | |
429 (void)os::set_priority(thread, priority); | |
430 } | |
431 | |
432 | |
433 void Thread::start(Thread* thread) { | |
434 trace("start", thread); | |
435 // Start is different from resume in that its safety is guaranteed by context or | |
436 // being called from a Java method synchronized on the Thread object. | |
437 if (!DisableStartThread) { | |
438 if (thread->is_Java_thread()) { | |
439 // Initialize the thread state to RUNNABLE before starting this thread. | |
440 // Can not set it after the thread started because we do not know the | |
441 // exact thread state at that time. It could be in MONITOR_WAIT or | |
442 // in SLEEPING or some other state. | |
443 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
444 java_lang_Thread::RUNNABLE); | |
445 } | |
446 os::start_thread(thread); | |
447 } | |
448 } | |
449 | |
450 // Enqueue a VM_Operation to do the job for us - sometime later | |
451 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
452 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
453 VMThread::execute(vm_stop); | |
454 } | |
455 | |
456 | |
457 // | |
458 // Check if an external suspend request has completed (or has been | |
459 // cancelled). Returns true if the thread is externally suspended and | |
460 // false otherwise. | |
461 // | |
462 // The bits parameter returns information about the code path through | |
463 // the routine. Useful for debugging: | |
464 // | |
465 // set in is_ext_suspend_completed(): | |
466 // 0x00000001 - routine was entered | |
467 // 0x00000010 - routine return false at end | |
468 // 0x00000100 - thread exited (return false) | |
469 // 0x00000200 - suspend request cancelled (return false) | |
470 // 0x00000400 - thread suspended (return true) | |
471 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
472 // 0x00002000 - thread is native and walkable (return true) | |
473 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
474 // | |
475 // set in wait_for_ext_suspend_completion(): | |
476 // 0x00010000 - routine was entered | |
477 // 0x00020000 - suspend request cancelled before loop (return false) | |
478 // 0x00040000 - thread suspended before loop (return true) | |
479 // 0x00080000 - suspend request cancelled in loop (return false) | |
480 // 0x00100000 - thread suspended in loop (return true) | |
481 // 0x00200000 - suspend not completed during retry loop (return false) | |
482 // | |
483 | |
484 // Helper class for tracing suspend wait debug bits. | |
485 // | |
486 // 0x00000100 indicates that the target thread exited before it could | |
487 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
488 // 0x00080000 each indicate a cancelled suspend request so they don't | |
489 // count as wait failures either. | |
490 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
491 | |
492 class TraceSuspendDebugBits : public StackObj { | |
493 private: | |
494 JavaThread * jt; | |
495 bool is_wait; | |
496 bool called_by_wait; // meaningful when !is_wait | |
497 uint32_t * bits; | |
498 | |
499 public: | |
500 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
501 uint32_t *_bits) { | |
502 jt = _jt; | |
503 is_wait = _is_wait; | |
504 called_by_wait = _called_by_wait; | |
505 bits = _bits; | |
506 } | |
507 | |
508 ~TraceSuspendDebugBits() { | |
509 if (!is_wait) { | |
510 #if 1 | |
511 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
512 // That trace is very chatty. | |
513 return; | |
514 #else | |
515 if (!called_by_wait) { | |
516 // If tracing for is_ext_suspend_completed() is enabled, then only | |
517 // trace calls to it from wait_for_ext_suspend_completion() | |
518 return; | |
519 } | |
520 #endif | |
521 } | |
522 | |
523 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
524 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
525 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
526 ResourceMark rm; | |
527 | |
528 tty->print_cr( | |
529 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
530 jt->get_thread_name(), *bits); | |
531 | |
532 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
533 } | |
534 } | |
535 } | |
536 }; | |
537 #undef DEBUG_FALSE_BITS | |
538 | |
539 | |
540 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
541 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
542 | |
543 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
544 bool do_trans_retry; // flag to force the retry | |
545 | |
546 *bits |= 0x00000001; | |
547 | |
548 do { | |
549 do_trans_retry = false; | |
550 | |
551 if (is_exiting()) { | |
552 // Thread is in the process of exiting. This is always checked | |
553 // first to reduce the risk of dereferencing a freed JavaThread. | |
554 *bits |= 0x00000100; | |
555 return false; | |
556 } | |
557 | |
558 if (!is_external_suspend()) { | |
559 // Suspend request is cancelled. This is always checked before | |
560 // is_ext_suspended() to reduce the risk of a rogue resume | |
561 // confusing the thread that made the suspend request. | |
562 *bits |= 0x00000200; | |
563 return false; | |
564 } | |
565 | |
566 if (is_ext_suspended()) { | |
567 // thread is suspended | |
568 *bits |= 0x00000400; | |
569 return true; | |
570 } | |
571 | |
572 // Now that we no longer do hard suspends of threads running | |
573 // native code, the target thread can be changing thread state | |
574 // while we are in this routine: | |
575 // | |
576 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
577 // | |
578 // We save a copy of the thread state as observed at this moment | |
579 // and make our decision about suspend completeness based on the | |
580 // copy. This closes the race where the thread state is seen as | |
581 // _thread_in_native_trans in the if-thread_blocked check, but is | |
582 // seen as _thread_blocked in if-thread_in_native_trans check. | |
583 JavaThreadState save_state = thread_state(); | |
584 | |
585 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
586 // If the thread's state is _thread_blocked and this blocking | |
587 // condition is known to be equivalent to a suspend, then we can | |
588 // consider the thread to be externally suspended. This means that | |
589 // the code that sets _thread_blocked has been modified to do | |
590 // self-suspension if the blocking condition releases. We also | |
591 // used to check for CONDVAR_WAIT here, but that is now covered by | |
592 // the _thread_blocked with self-suspension check. | |
593 // | |
594 // Return true since we wouldn't be here unless there was still an | |
595 // external suspend request. | |
596 *bits |= 0x00001000; | |
597 return true; | |
598 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
599 // Threads running native code will self-suspend on native==>VM/Java | |
600 // transitions. If its stack is walkable (should always be the case | |
601 // unless this function is called before the actual java_suspend() | |
602 // call), then the wait is done. | |
603 *bits |= 0x00002000; | |
604 return true; | |
605 } else if (!called_by_wait && !did_trans_retry && | |
606 save_state == _thread_in_native_trans && | |
607 frame_anchor()->walkable()) { | |
608 // The thread is transitioning from thread_in_native to another | |
609 // thread state. check_safepoint_and_suspend_for_native_trans() | |
610 // will force the thread to self-suspend. If it hasn't gotten | |
611 // there yet we may have caught the thread in-between the native | |
612 // code check above and the self-suspend. Lucky us. If we were | |
613 // called by wait_for_ext_suspend_completion(), then it | |
614 // will be doing the retries so we don't have to. | |
615 // | |
616 // Since we use the saved thread state in the if-statement above, | |
617 // there is a chance that the thread has already transitioned to | |
618 // _thread_blocked by the time we get here. In that case, we will | |
619 // make a single unnecessary pass through the logic below. This | |
620 // doesn't hurt anything since we still do the trans retry. | |
621 | |
622 *bits |= 0x00004000; | |
623 | |
624 // Once the thread leaves thread_in_native_trans for another | |
625 // thread state, we break out of this retry loop. We shouldn't | |
626 // need this flag to prevent us from getting back here, but | |
627 // sometimes paranoia is good. | |
628 did_trans_retry = true; | |
629 | |
630 // We wait for the thread to transition to a more usable state. | |
631 for (int i = 1; i <= SuspendRetryCount; i++) { | |
632 // We used to do an "os::yield_all(i)" call here with the intention | |
633 // that yielding would increase on each retry. However, the parameter | |
634 // is ignored on Linux which means the yield didn't scale up. Waiting | |
635 // on the SR_lock below provides a much more predictable scale up for | |
636 // the delay. It also provides a simple/direct point to check for any | |
637 // safepoint requests from the VMThread | |
638 | |
639 // temporarily drops SR_lock while doing wait with safepoint check | |
640 // (if we're a JavaThread - the WatcherThread can also call this) | |
641 // and increase delay with each retry | |
642 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
643 | |
644 // check the actual thread state instead of what we saved above | |
645 if (thread_state() != _thread_in_native_trans) { | |
646 // the thread has transitioned to another thread state so | |
647 // try all the checks (except this one) one more time. | |
648 do_trans_retry = true; | |
649 break; | |
650 } | |
651 } // end retry loop | |
652 | |
653 | |
654 } | |
655 } while (do_trans_retry); | |
656 | |
657 *bits |= 0x00000010; | |
658 return false; | |
659 } | |
660 | |
661 // | |
662 // Wait for an external suspend request to complete (or be cancelled). | |
663 // Returns true if the thread is externally suspended and false otherwise. | |
664 // | |
665 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
666 uint32_t *bits) { | |
667 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
668 false /* !called_by_wait */, bits); | |
669 | |
670 // local flag copies to minimize SR_lock hold time | |
671 bool is_suspended; | |
672 bool pending; | |
673 uint32_t reset_bits; | |
674 | |
675 // set a marker so is_ext_suspend_completed() knows we are the caller | |
676 *bits |= 0x00010000; | |
677 | |
678 // We use reset_bits to reinitialize the bits value at the top of | |
679 // each retry loop. This allows the caller to make use of any | |
680 // unused bits for their own marking purposes. | |
681 reset_bits = *bits; | |
682 | |
683 { | |
684 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
685 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
686 delay, bits); | |
687 pending = is_external_suspend(); | |
688 } | |
689 // must release SR_lock to allow suspension to complete | |
690 | |
691 if (!pending) { | |
692 // A cancelled suspend request is the only false return from | |
693 // is_ext_suspend_completed() that keeps us from entering the | |
694 // retry loop. | |
695 *bits |= 0x00020000; | |
696 return false; | |
697 } | |
698 | |
699 if (is_suspended) { | |
700 *bits |= 0x00040000; | |
701 return true; | |
702 } | |
703 | |
704 for (int i = 1; i <= retries; i++) { | |
705 *bits = reset_bits; // reinit to only track last retry | |
706 | |
707 // We used to do an "os::yield_all(i)" call here with the intention | |
708 // that yielding would increase on each retry. However, the parameter | |
709 // is ignored on Linux which means the yield didn't scale up. Waiting | |
710 // on the SR_lock below provides a much more predictable scale up for | |
711 // the delay. It also provides a simple/direct point to check for any | |
712 // safepoint requests from the VMThread | |
713 | |
714 { | |
715 MutexLocker ml(SR_lock()); | |
716 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
717 // can also call this) and increase delay with each retry | |
718 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
719 | |
720 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
721 delay, bits); | |
722 | |
723 // It is possible for the external suspend request to be cancelled | |
724 // (by a resume) before the actual suspend operation is completed. | |
725 // Refresh our local copy to see if we still need to wait. | |
726 pending = is_external_suspend(); | |
727 } | |
728 | |
729 if (!pending) { | |
730 // A cancelled suspend request is the only false return from | |
731 // is_ext_suspend_completed() that keeps us from staying in the | |
732 // retry loop. | |
733 *bits |= 0x00080000; | |
734 return false; | |
735 } | |
736 | |
737 if (is_suspended) { | |
738 *bits |= 0x00100000; | |
739 return true; | |
740 } | |
741 } // end retry loop | |
742 | |
743 // thread did not suspend after all our retries | |
744 *bits |= 0x00200000; | |
745 return false; | |
746 } | |
747 | |
748 #ifndef PRODUCT | |
749 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
750 | |
751 // This should not need to be atomic as the only way for simultaneous | |
14309 | 752 // updates is via interrupts. Even then this should be rare or non-existent |
0 | 753 // and we don't care that much anyway. |
754 | |
755 int index = _jmp_ring_index; | |
756 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
757 _jmp_ring[index]._target = (intptr_t) target; | |
758 _jmp_ring[index]._instruction = (intptr_t) instr; | |
759 _jmp_ring[index]._file = file; | |
760 _jmp_ring[index]._line = line; | |
761 } | |
762 #endif /* PRODUCT */ | |
763 | |
764 // Called by flat profiler | |
765 // Callers have already called wait_for_ext_suspend_completion | |
766 // The assertion for that is currently too complex to put here: | |
767 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
768 bool gotframe = false; | |
769 // self suspension saves needed state. | |
770 if (has_last_Java_frame() && _anchor.walkable()) { | |
771 *_fr = pd_last_frame(); | |
772 gotframe = true; | |
773 } | |
774 return gotframe; | |
775 } | |
776 | |
777 void Thread::interrupt(Thread* thread) { | |
778 trace("interrupt", thread); | |
779 debug_only(check_for_dangling_thread_pointer(thread);) | |
780 os::interrupt(thread); | |
781 } | |
782 | |
783 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
784 trace("is_interrupted", thread); | |
785 debug_only(check_for_dangling_thread_pointer(thread);) | |
786 // Note: If clear_interrupted==false, this simply fetches and | |
787 // returns the value of the field osthread()->interrupted(). | |
788 return os::is_interrupted(thread, clear_interrupted); | |
789 } | |
790 | |
791 | |
792 // GC Support | |
793 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
794 jint thread_parity = _oops_do_parity; | |
795 if (thread_parity != strong_roots_parity) { | |
796 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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797 if (res == thread_parity) { |
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798 return true; |
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799 } else { |
0 | 800 guarantee(res == strong_roots_parity, "Or else what?"); |
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801 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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802 "Should only fail when parallel."); |
0 | 803 return false; |
804 } | |
805 } | |
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806 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
0 | 807 "Should only fail when parallel."); |
808 return false; | |
809 } | |
810 | |
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811 void Thread::oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf) { |
0 | 812 active_handles()->oops_do(f); |
813 // Do oop for ThreadShadow | |
814 f->do_oop((oop*)&_pending_exception); | |
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815 #ifdef GRAAL |
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816 f->do_oop((oop*)&_pending_failed_speculation); |
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817 #endif |
0 | 818 handle_area()->oops_do(f); |
819 } | |
820 | |
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821 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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822 // no nmethods in a generic thread... |
0 | 823 } |
824 | |
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825 void Thread::metadata_do(void f(Metadata*)) { |
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826 if (metadata_handles() != NULL) { |
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827 for (int i = 0; i< metadata_handles()->length(); i++) { |
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828 f(metadata_handles()->at(i)); |
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829 } |
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830 } |
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831 } |
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832 |
0 | 833 void Thread::print_on(outputStream* st) const { |
834 // get_priority assumes osthread initialized | |
835 if (osthread() != NULL) { | |
6766 | 836 int os_prio; |
837 if (os::get_native_priority(this, &os_prio) == OS_OK) { | |
838 st->print("os_prio=%d ", os_prio); | |
839 } | |
840 st->print("tid=" INTPTR_FORMAT " ", this); | |
0 | 841 osthread()->print_on(st); |
842 } | |
843 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
844 } | |
845 | |
846 // Thread::print_on_error() is called by fatal error handler. Don't use | |
847 // any lock or allocate memory. | |
848 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
849 if (is_VM_thread()) st->print("VMThread"); | |
850 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
851 else if (is_Java_thread()) st->print("JavaThread"); | |
852 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
853 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
854 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
855 else st->print("Thread"); | |
856 | |
857 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
858 _stack_base - _stack_size, _stack_base); | |
859 | |
860 if (osthread()) { | |
861 st->print(" [id=%d]", osthread()->thread_id()); | |
862 } | |
863 } | |
864 | |
865 #ifdef ASSERT | |
866 void Thread::print_owned_locks_on(outputStream* st) const { | |
867 Monitor *cur = _owned_locks; | |
868 if (cur == NULL) { | |
869 st->print(" (no locks) "); | |
870 } else { | |
871 st->print_cr(" Locks owned:"); | |
872 while(cur) { | |
873 cur->print_on(st); | |
874 cur = cur->next(); | |
875 } | |
876 } | |
877 } | |
878 | |
879 static int ref_use_count = 0; | |
880 | |
881 bool Thread::owns_locks_but_compiled_lock() const { | |
882 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
883 if (cur != Compile_lock) return true; | |
884 } | |
885 return false; | |
886 } | |
887 | |
888 | |
889 #endif | |
890 | |
891 #ifndef PRODUCT | |
892 | |
893 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
894 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
895 // no threads which allow_vm_block's are held | |
896 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
897 // Check if current thread is allowed to block at a safepoint | |
898 if (!(_allow_safepoint_count == 0)) | |
899 fatal("Possible safepoint reached by thread that does not allow it"); | |
900 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
901 fatal("LEAF method calling lock?"); | |
902 } | |
903 | |
904 #ifdef ASSERT | |
905 if (potential_vm_operation && is_Java_thread() | |
906 && !Universe::is_bootstrapping()) { | |
907 // Make sure we do not hold any locks that the VM thread also uses. | |
908 // This could potentially lead to deadlocks | |
909 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
910 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
911 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
912 // since it is used to transfer control between JavaThreads and the VMThread | |
14309 | 913 // Do not *exclude* any locks unless you are absolutely sure it is correct. Ask someone else first! |
0 | 914 if ( (cur->allow_vm_block() && |
915 cur != Threads_lock && | |
14309 | 916 cur != Compile_lock && // Temporary: should not be necessary when we get separate compilation |
0 | 917 cur != VMOperationRequest_lock && |
918 cur != VMOperationQueue_lock) || | |
919 cur->rank() == Mutex::special) { | |
920 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
921 } | |
922 } | |
923 } | |
924 | |
925 if (GCALotAtAllSafepoints) { | |
926 // We could enter a safepoint here and thus have a gc | |
927 InterfaceSupport::check_gc_alot(); | |
928 } | |
929 #endif | |
930 } | |
931 #endif | |
932 | |
933 bool Thread::is_in_stack(address adr) const { | |
934 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
935 address end = os::current_stack_pointer(); | |
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936 // Allow non Java threads to call this without stack_base |
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937 if (_stack_base == NULL) return true; |
0 | 938 if (stack_base() >= adr && adr >= end) return true; |
939 | |
940 return false; | |
941 } | |
942 | |
943 | |
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944 bool Thread::is_in_usable_stack(address adr) const { |
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945 size_t stack_guard_size = os::uses_stack_guard_pages() ? (StackYellowPages + StackRedPages) * os::vm_page_size() : 0; |
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946 size_t usable_stack_size = _stack_size - stack_guard_size; |
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947 |
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948 return ((adr < stack_base()) && (adr >= stack_base() - usable_stack_size)); |
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949 } |
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950 |
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951 |
0 | 952 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter |
953 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
954 // used for compilation in the future. If that change is made, the need for these methods | |
955 // should be revisited, and they should be removed if possible. | |
956 | |
957 bool Thread::is_lock_owned(address adr) const { | |
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958 return on_local_stack(adr); |
0 | 959 } |
960 | |
961 bool Thread::set_as_starting_thread() { | |
962 // NOTE: this must be called inside the main thread. | |
963 return os::create_main_thread((JavaThread*)this); | |
964 } | |
965 | |
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966 static void initialize_class(Symbol* class_name, TRAPS) { |
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967 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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968 InstanceKlass::cast(klass)->initialize(CHECK); |
0 | 969 } |
970 | |
971 | |
972 // Creates the initial ThreadGroup | |
973 static Handle create_initial_thread_group(TRAPS) { | |
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974 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
0 | 975 instanceKlassHandle klass (THREAD, k); |
976 | |
977 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
978 { | |
979 JavaValue result(T_VOID); | |
980 JavaCalls::call_special(&result, | |
981 system_instance, | |
982 klass, | |
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983 vmSymbols::object_initializer_name(), |
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984 vmSymbols::void_method_signature(), |
0 | 985 CHECK_NH); |
986 } | |
987 Universe::set_system_thread_group(system_instance()); | |
988 | |
989 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
990 { | |
991 JavaValue result(T_VOID); | |
992 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
993 JavaCalls::call_special(&result, | |
994 main_instance, | |
995 klass, | |
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996 vmSymbols::object_initializer_name(), |
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997 vmSymbols::threadgroup_string_void_signature(), |
0 | 998 system_instance, |
999 string, | |
1000 CHECK_NH); | |
1001 } | |
1002 return main_instance; | |
1003 } | |
1004 | |
1005 // Creates the initial Thread | |
1006 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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1007 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
0 | 1008 instanceKlassHandle klass (THREAD, k); |
1009 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
1010 | |
1011 java_lang_Thread::set_thread(thread_oop(), thread); | |
1012 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1013 thread->set_threadObj(thread_oop()); | |
1014 | |
1015 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
1016 | |
1017 JavaValue result(T_VOID); | |
1018 JavaCalls::call_special(&result, thread_oop, | |
1019 klass, | |
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1020 vmSymbols::object_initializer_name(), |
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1021 vmSymbols::threadgroup_string_void_signature(), |
0 | 1022 thread_group, |
1023 string, | |
1024 CHECK_NULL); | |
1025 return thread_oop(); | |
1026 } | |
1027 | |
1028 static void call_initializeSystemClass(TRAPS) { | |
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1029 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1030 instanceKlassHandle klass (THREAD, k); |
1031 | |
1032 JavaValue result(T_VOID); | |
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1033 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1034 vmSymbols::void_method_signature(), CHECK); |
0 | 1035 } |
1036 | |
6181 | 1037 char java_runtime_name[128] = ""; |
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1038 char java_runtime_version[128] = ""; |
6181 | 1039 |
1040 // extract the JRE name from sun.misc.Version.java_runtime_name | |
1041 static const char* get_java_runtime_name(TRAPS) { | |
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1042 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
6181 | 1043 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
1044 fieldDescriptor fd; | |
1045 bool found = k != NULL && | |
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1046 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
6181 | 1047 vmSymbols::string_signature(), &fd); |
1048 if (found) { | |
1049 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
1050 if (name_oop == NULL) | |
1051 return NULL; | |
1052 const char* name = java_lang_String::as_utf8_string(name_oop, | |
1053 java_runtime_name, | |
1054 sizeof(java_runtime_name)); | |
1055 return name; | |
1056 } else { | |
1057 return NULL; | |
1058 } | |
1059 } | |
1060 | |
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1061 // extract the JRE version from sun.misc.Version.java_runtime_version |
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1062 static const char* get_java_runtime_version(TRAPS) { |
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1063 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
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1064 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
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1065 fieldDescriptor fd; |
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1066 bool found = k != NULL && |
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1067 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_version_name(), |
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1068 vmSymbols::string_signature(), &fd); |
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1069 if (found) { |
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1070 oop name_oop = k->java_mirror()->obj_field(fd.offset()); |
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1071 if (name_oop == NULL) |
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1072 return NULL; |
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1073 const char* name = java_lang_String::as_utf8_string(name_oop, |
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1074 java_runtime_version, |
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1075 sizeof(java_runtime_version)); |
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1076 return name; |
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1077 } else { |
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1078 return NULL; |
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1079 } |
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1080 } |
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1081 |
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1082 // General purpose hook into Java code, run once when the VM is initialized. |
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1083 // The Java library method itself may be changed independently from the VM. |
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1084 static void call_postVMInitHook(TRAPS) { |
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1085 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::sun_misc_PostVMInitHook(), THREAD); |
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1086 instanceKlassHandle klass (THREAD, k); |
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1087 if (klass.not_null()) { |
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1088 JavaValue result(T_VOID); |
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1089 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1090 vmSymbols::void_method_signature(), |
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1091 CHECK); |
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1092 } |
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1093 } |
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1094 |
0 | 1095 static void reset_vm_info_property(TRAPS) { |
1096 // the vm info string | |
1097 ResourceMark rm(THREAD); | |
1098 const char *vm_info = VM_Version::vm_info_string(); | |
1099 | |
1100 // java.lang.System class | |
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1101 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1102 instanceKlassHandle klass (THREAD, k); |
1103 | |
1104 // setProperty arguments | |
1105 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
1106 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
1107 | |
1108 // return value | |
1109 JavaValue r(T_OBJECT); | |
1110 | |
1111 // public static String setProperty(String key, String value); | |
1112 JavaCalls::call_static(&r, | |
1113 klass, | |
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1114 vmSymbols::setProperty_name(), |
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1115 vmSymbols::string_string_string_signature(), |
0 | 1116 key_str, |
1117 value_str, | |
1118 CHECK); | |
1119 } | |
1120 | |
1121 | |
1122 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
1123 assert(thread_group.not_null(), "thread group should be specified"); | |
1124 assert(threadObj() == NULL, "should only create Java thread object once"); | |
1125 | |
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1126 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 1127 instanceKlassHandle klass (THREAD, k); |
1128 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
1129 | |
1130 java_lang_Thread::set_thread(thread_oop(), this); | |
1131 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1132 set_threadObj(thread_oop()); | |
1133 | |
1134 JavaValue result(T_VOID); | |
1135 if (thread_name != NULL) { | |
1136 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
1137 // Thread gets assigned specified name and null target | |
1138 JavaCalls::call_special(&result, | |
1139 thread_oop, | |
1140 klass, | |
2177
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1141 vmSymbols::object_initializer_name(), |
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1142 vmSymbols::threadgroup_string_void_signature(), |
0 | 1143 thread_group, // Argument 1 |
1144 name, // Argument 2 | |
1145 THREAD); | |
1146 } else { | |
1147 // Thread gets assigned name "Thread-nnn" and null target | |
1148 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
1149 JavaCalls::call_special(&result, | |
1150 thread_oop, | |
1151 klass, | |
2177
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1152 vmSymbols::object_initializer_name(), |
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1153 vmSymbols::threadgroup_runnable_void_signature(), |
0 | 1154 thread_group, // Argument 1 |
1155 Handle(), // Argument 2 | |
1156 THREAD); | |
1157 } | |
1158 | |
1159 | |
1160 if (daemon) { | |
1161 java_lang_Thread::set_daemon(thread_oop()); | |
1162 } | |
1163 | |
1164 if (HAS_PENDING_EXCEPTION) { | |
1165 return; | |
1166 } | |
1167 | |
1142 | 1168 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
0 | 1169 Handle threadObj(this, this->threadObj()); |
1170 | |
1171 JavaCalls::call_special(&result, | |
1172 thread_group, | |
1173 group, | |
2177
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1174 vmSymbols::add_method_name(), |
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1175 vmSymbols::thread_void_signature(), |
0 | 1176 threadObj, // Arg 1 |
1177 THREAD); | |
1178 | |
1179 | |
1180 } | |
1181 | |
1182 // NamedThread -- non-JavaThread subclasses with multiple | |
1183 // uniquely named instances should derive from this. | |
1184 NamedThread::NamedThread() : Thread() { | |
1185 _name = NULL; | |
1119
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1186 _processed_thread = NULL; |
0 | 1187 } |
1188 | |
1189 NamedThread::~NamedThread() { | |
1190 if (_name != NULL) { | |
6197 | 1191 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
0 | 1192 _name = NULL; |
1193 } | |
1194 } | |
1195 | |
1196 void NamedThread::set_name(const char* format, ...) { | |
1197 guarantee(_name == NULL, "Only get to set name once."); | |
6197 | 1198 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
0 | 1199 guarantee(_name != NULL, "alloc failure"); |
1200 va_list ap; | |
1201 va_start(ap, format); | |
1202 jio_vsnprintf(_name, max_name_len, format, ap); | |
1203 va_end(ap); | |
1204 } | |
1205 | |
1206 // ======= WatcherThread ======== | |
1207 | |
1208 // The watcher thread exists to simulate timer interrupts. It should | |
1209 // be replaced by an abstraction over whatever native support for | |
1210 // timer interrupts exists on the platform. | |
1211 | |
1212 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
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1213 bool WatcherThread::_startable = false; |
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1214 volatile bool WatcherThread::_should_terminate = false; |
0 | 1215 |
11151 | 1216 WatcherThread::WatcherThread() : Thread(), _crash_protection(NULL) { |
0 | 1217 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); |
1218 if (os::create_thread(this, os::watcher_thread)) { | |
1219 _watcher_thread = this; | |
1220 | |
1221 // Set the watcher thread to the highest OS priority which should not be | |
1222 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1223 // is created. The only normal thread using this priority is the reference | |
1224 // handler thread, which runs for very short intervals only. | |
1225 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1226 // will be inaccurate. | |
1227 os::set_priority(this, MaxPriority); | |
1228 if (!DisableStartThread) { | |
1229 os::start_thread(this); | |
1230 } | |
1231 } | |
1232 } | |
1233 | |
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1234 int WatcherThread::sleep() const { |
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1235 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1236 |
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1237 // remaining will be zero if there are no tasks, |
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1238 // causing the WatcherThread to sleep until a task is |
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1239 // enrolled |
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1240 int remaining = PeriodicTask::time_to_wait(); |
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1241 int time_slept = 0; |
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1242 |
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1243 // we expect this to timeout - we only ever get unparked when |
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1244 // we should terminate or when a new task has been enrolled |
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1245 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1246 |
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1247 jlong time_before_loop = os::javaTimeNanos(); |
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1248 |
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1249 for (;;) { |
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1250 bool timedout = PeriodicTask_lock->wait(Mutex::_no_safepoint_check_flag, remaining); |
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1251 jlong now = os::javaTimeNanos(); |
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1252 |
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1253 if (remaining == 0) { |
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1254 // if we didn't have any tasks we could have waited for a long time |
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1255 // consider the time_slept zero and reset time_before_loop |
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1256 time_slept = 0; |
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1257 time_before_loop = now; |
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1258 } else { |
14309 | 1259 // need to recalculate since we might have new tasks in _tasks |
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1260 time_slept = (int) ((now - time_before_loop) / 1000000); |
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1261 } |
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1262 |
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1263 // Change to task list or spurious wakeup of some kind |
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1264 if (timedout || _should_terminate) { |
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1265 break; |
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1266 } |
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1267 |
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1268 remaining = PeriodicTask::time_to_wait(); |
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1269 if (remaining == 0) { |
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1270 // Last task was just disenrolled so loop around and wait until |
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1271 // another task gets enrolled |
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1272 continue; |
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1273 } |
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1274 |
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1275 remaining -= time_slept; |
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1276 if (remaining <= 0) |
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1277 break; |
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1278 } |
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1279 |
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1280 return time_slept; |
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1281 } |
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1282 |
0 | 1283 void WatcherThread::run() { |
1284 assert(this == watcher_thread(), "just checking"); | |
1285 | |
1286 this->record_stack_base_and_size(); | |
1287 this->initialize_thread_local_storage(); | |
1288 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1289 while(!_should_terminate) { | |
1290 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1291 assert(watcher_thread() == this, "thread consistency check"); | |
1292 | |
1293 // Calculate how long it'll be until the next PeriodicTask work | |
1294 // should be done, and sleep that amount of time. | |
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1295 int time_waited = sleep(); |
0 | 1296 |
1297 if (is_error_reported()) { | |
1298 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1299 // should abort JVM after creating an error log file. However in some | |
1300 // rare cases, the error handler itself might deadlock. Here we try to | |
1301 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1302 // | |
1303 // This code is in WatcherThread because WatcherThread wakes up | |
1304 // periodically so the fatal error handler doesn't need to do anything; | |
1305 // also because the WatcherThread is less likely to crash than other | |
1306 // threads. | |
1307 | |
1308 for (;;) { | |
1309 if (!ShowMessageBoxOnError | |
1310 && (OnError == NULL || OnError[0] == '\0') | |
1311 && Arguments::abort_hook() == NULL) { | |
1312 os::sleep(this, 2 * 60 * 1000, false); | |
1313 fdStream err(defaultStream::output_fd()); | |
1314 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1315 // skip atexit/vm_exit/vm_abort hooks | |
1316 os::die(); | |
1317 } | |
1318 | |
1319 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1320 // ShowMessageBoxOnError when it is ready to abort. | |
1321 os::sleep(this, 5 * 1000, false); | |
1322 } | |
1323 } | |
1324 | |
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1325 PeriodicTask::real_time_tick(time_waited); |
0 | 1326 } |
1327 | |
1328 // Signal that it is terminated | |
1329 { | |
1330 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1331 _watcher_thread = NULL; | |
1332 Terminator_lock->notify(); | |
1333 } | |
1334 | |
1335 // Thread destructor usually does this.. | |
1336 ThreadLocalStorage::set_thread(NULL); | |
1337 } | |
1338 | |
1339 void WatcherThread::start() { | |
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1340 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1341 |
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1342 if (watcher_thread() == NULL && _startable) { |
0 | 1343 _should_terminate = false; |
1344 // Create the single instance of WatcherThread | |
1345 new WatcherThread(); | |
1346 } | |
1347 } | |
1348 | |
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1349 void WatcherThread::make_startable() { |
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1350 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1351 _startable = true; |
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1352 } |
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1353 |
0 | 1354 void WatcherThread::stop() { |
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1355 { |
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1356 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1357 _should_terminate = true; |
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1358 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1359 |
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1360 WatcherThread* watcher = watcher_thread(); |
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1361 if (watcher != NULL) |
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1362 watcher->unpark(); |
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1363 } |
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1364 |
0 | 1365 // it is ok to take late safepoints here, if needed |
1366 MutexLocker mu(Terminator_lock); | |
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1367 |
0 | 1368 while(watcher_thread() != NULL) { |
1369 // This wait should make safepoint checks, wait without a timeout, | |
1370 // and wait as a suspend-equivalent condition. | |
1371 // | |
1372 // Note: If the FlatProfiler is running, then this thread is waiting | |
1373 // for the WatcherThread to terminate and the WatcherThread, via the | |
1374 // FlatProfiler task, is waiting for the external suspend request on | |
1375 // this thread to complete. wait_for_ext_suspend_completion() will | |
1376 // eventually timeout, but that takes time. Making this wait a | |
1377 // suspend-equivalent condition solves that timeout problem. | |
1378 // | |
1379 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1380 Mutex::_as_suspend_equivalent_flag); | |
1381 } | |
1382 } | |
1383 | |
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1384 void WatcherThread::unpark() { |
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1385 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1386 PeriodicTask_lock->notify(); |
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1387 } |
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1388 |
0 | 1389 void WatcherThread::print_on(outputStream* st) const { |
1390 st->print("\"%s\" ", name()); | |
1391 Thread::print_on(st); | |
1392 st->cr(); | |
1393 } | |
1394 | |
1395 // ======= JavaThread ======== | |
1396 | |
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1397 #ifdef GRAAL |
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1398 |
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1399 jlong* JavaThread::_graal_old_thread_counters; |
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1400 |
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1401 bool graal_counters_include(oop threadObj) { |
13796
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1402 return !GraalCountersExcludeCompiler || threadObj == NULL || threadObj->klass() != SystemDictionary::CompilerThread_klass(); |
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1403 } |
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1404 |
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1405 void JavaThread::collect_counters(typeArrayOop array) { |
13796
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1406 if (GraalCounterSize > 0) { |
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1407 MutexLocker tl(Threads_lock); |
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1408 for (int i = 0; i < array->length(); i++) { |
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1409 array->long_at_put(i, _graal_old_thread_counters[i]); |
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1410 } |
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1411 for (JavaThread* tp = Threads::first(); tp != NULL; tp = tp->next()) { |
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1412 if (graal_counters_include(tp->threadObj())) { |
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1413 for (int i = 0; i < array->length(); i++) { |
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1414 array->long_at_put(i, array->long_at(i) + tp->_graal_counters[i]); |
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1415 } |
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1416 } |
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1417 } |
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1418 } |
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1419 } |
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1420 |
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1421 #endif // GRAAL |
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1422 |
0 | 1423 // A JavaThread is a normal Java thread |
1424 | |
1425 void JavaThread::initialize() { | |
1426 // Initialize fields | |
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1427 |
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1428 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1429 set_claimed_par_id(-1); |
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1430 |
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1431 _buffer_blob = NULL; |
0 | 1432 set_saved_exception_pc(NULL); |
1433 set_threadObj(NULL); | |
1434 _anchor.clear(); | |
1435 set_entry_point(NULL); | |
1436 set_jni_functions(jni_functions()); | |
1437 set_callee_target(NULL); | |
1438 set_vm_result(NULL); | |
1439 set_vm_result_2(NULL); | |
1440 set_vframe_array_head(NULL); | |
1441 set_vframe_array_last(NULL); | |
1442 set_deferred_locals(NULL); | |
1443 set_deopt_mark(NULL); | |
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1444 set_deopt_nmethod(NULL); |
0 | 1445 clear_must_deopt_id(); |
1446 set_monitor_chunks(NULL); | |
1447 set_next(NULL); | |
1448 set_thread_state(_thread_new); | |
6854
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1449 #if INCLUDE_NMT |
6197 | 1450 set_recorder(NULL); |
6854
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1451 #endif |
0 | 1452 _terminated = _not_terminated; |
1453 _privileged_stack_top = NULL; | |
1454 _array_for_gc = NULL; | |
1455 _suspend_equivalent = false; | |
1456 _in_deopt_handler = 0; | |
1457 _doing_unsafe_access = false; | |
1458 _stack_guard_state = stack_guard_unused; | |
5747
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|
1459 #ifdef GRAAL |
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|
1460 _graal_alternate_call_target = NULL; |
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1461 _graal_implicit_exception_pc = NULL; |
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1462 _graal_compiling = false; |
13796
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1463 if (GraalCounterSize > 0) { |
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1464 _graal_counters = NEW_C_HEAP_ARRAY(jlong, GraalCounterSize, mtInternal); |
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1465 memset(_graal_counters, 0, sizeof(jlong) * GraalCounterSize); |
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1466 } else { |
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1467 _graal_counters = NULL; |
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1468 } |
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1469 #endif // GRAAL |
12316
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12253
diff
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|
1470 (void)const_cast<oop&>(_exception_oop = NULL); |
0 | 1471 _exception_pc = 0; |
1472 _exception_handler_pc = 0; | |
1903 | 1473 _is_method_handle_return = 0; |
0 | 1474 _jvmti_thread_state= NULL; |
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1475 _should_post_on_exceptions_flag = JNI_FALSE; |
0 | 1476 _jvmti_get_loaded_classes_closure = NULL; |
1477 _interp_only_mode = 0; | |
1478 _special_runtime_exit_condition = _no_async_condition; | |
1479 _pending_async_exception = NULL; | |
1480 _thread_stat = NULL; | |
1481 _thread_stat = new ThreadStatistics(); | |
1482 _blocked_on_compilation = false; | |
1483 _jni_active_critical = 0; | |
1484 _do_not_unlock_if_synchronized = false; | |
1485 _cached_monitor_info = NULL; | |
1486 _parker = Parker::Allocate(this) ; | |
3696
dc7902820c9b
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diff
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|
1487 _scanned_nmethod = NULL; |
0 | 1488 |
1489 #ifndef PRODUCT | |
1490 _jmp_ring_index = 0; | |
1491 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1492 record_jump(NULL, NULL, NULL, 0); | |
1493 } | |
1494 #endif /* PRODUCT */ | |
1495 | |
1496 set_thread_profiler(NULL); | |
1497 if (FlatProfiler::is_active()) { | |
1498 // This is where we would decide to either give each thread it's own profiler | |
1499 // or use one global one from FlatProfiler, | |
1500 // or up to some count of the number of profiled threads, etc. | |
1501 ThreadProfiler* pp = new ThreadProfiler(); | |
1502 pp->engage(); | |
1503 set_thread_profiler(pp); | |
1504 } | |
1505 | |
1506 // Setup safepoint state info for this thread | |
1507 ThreadSafepointState::create(this); | |
1508 | |
1509 debug_only(_java_call_counter = 0); | |
1510 | |
1511 // JVMTI PopFrame support | |
1512 _popframe_condition = popframe_inactive; | |
1513 _popframe_preserved_args = NULL; | |
1514 _popframe_preserved_args_size = 0; | |
1515 | |
1516 pd_initialize(); | |
1517 } | |
1518 | |
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1519 #if INCLUDE_ALL_GCS |
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1520 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1521 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
8001
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1522 #endif // INCLUDE_ALL_GCS |
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1523 |
4006 | 1524 JavaThread::JavaThread(bool is_attaching_via_jni) : |
342
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1525 Thread() |
8001
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1526 #if INCLUDE_ALL_GCS |
342
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1527 , _satb_mark_queue(&_satb_mark_queue_set), |
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1528 _dirty_card_queue(&_dirty_card_queue_set) |
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1529 #endif // INCLUDE_ALL_GCS |
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1530 { |
0 | 1531 initialize(); |
4006 | 1532 if (is_attaching_via_jni) { |
1533 _jni_attach_state = _attaching_via_jni; | |
1534 } else { | |
1535 _jni_attach_state = _not_attaching_via_jni; | |
1536 } | |
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|
1537 assert(deferred_card_mark().is_empty(), "Default MemRegion ctor"); |
6197 | 1538 _safepoint_visible = false; |
0 | 1539 } |
1540 | |
1541 bool JavaThread::reguard_stack(address cur_sp) { | |
1542 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1543 return true; // Stack already guarded or guard pages not needed. | |
1544 } | |
1545 | |
1546 if (register_stack_overflow()) { | |
1547 // For those architectures which have separate register and | |
1548 // memory stacks, we must check the register stack to see if | |
1549 // it has overflowed. | |
1550 return false; | |
1551 } | |
1552 | |
1553 // Java code never executes within the yellow zone: the latter is only | |
1554 // there to provoke an exception during stack banging. If java code | |
1555 // is executing there, either StackShadowPages should be larger, or | |
1556 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1557 // when it should. | |
1558 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1559 | |
1560 enable_stack_yellow_zone(); | |
1561 return true; | |
1562 } | |
1563 | |
1564 bool JavaThread::reguard_stack(void) { | |
1565 return reguard_stack(os::current_stack_pointer()); | |
1566 } | |
1567 | |
1568 | |
1569 void JavaThread::block_if_vm_exited() { | |
1570 if (_terminated == _vm_exited) { | |
1571 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1572 // we will block here forever | |
1573 Threads_lock->lock_without_safepoint_check(); | |
1574 ShouldNotReachHere(); | |
1575 } | |
1576 } | |
1577 | |
1578 | |
1579 // Remove this ifdef when C1 is ported to the compiler interface. | |
1580 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1581 | |
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1582 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1583 Thread() |
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1584 #if INCLUDE_ALL_GCS |
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1585 , _satb_mark_queue(&_satb_mark_queue_set), |
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1586 _dirty_card_queue(&_dirty_card_queue_set) |
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1587 #endif // INCLUDE_ALL_GCS |
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1588 { |
0 | 1589 if (TraceThreadEvents) { |
1590 tty->print_cr("creating thread %p", this); | |
1591 } | |
1592 initialize(); | |
4006 | 1593 _jni_attach_state = _not_attaching_via_jni; |
0 | 1594 set_entry_point(entry_point); |
1595 // Create the native thread itself. | |
1596 // %note runtime_23 | |
1597 os::ThreadType thr_type = os::java_thread; | |
1598 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1599 os::java_thread; | |
1600 os::create_thread(this, thr_type, stack_sz); | |
6197 | 1601 _safepoint_visible = false; |
0 | 1602 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
1603 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1604 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1605 // the exception consists of creating the exception object & initializing it, initialization | |
1606 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1607 // | |
1608 // The thread is still suspended when we reach here. Thread must be explicit started | |
1609 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1610 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1611 // object must be fully initialized (take a look at JVM_Start) | |
1612 } | |
1613 | |
1614 JavaThread::~JavaThread() { | |
1615 if (TraceThreadEvents) { | |
1616 tty->print_cr("terminate thread %p", this); | |
1617 } | |
1618 | |
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1619 // By now, this thread should already be invisible to safepoint, |
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1620 // and its per-thread recorder also collected. |
6197 | 1621 assert(!is_safepoint_visible(), "wrong state"); |
6882
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1622 #if INCLUDE_NMT |
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1623 assert(get_recorder() == NULL, "Already collected"); |
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1624 #endif // INCLUDE_NMT |
6197 | 1625 |
0 | 1626 // JSR166 -- return the parker to the free list |
1627 Parker::Release(_parker); | |
1628 _parker = NULL ; | |
1629 | |
1630 // Free any remaining previous UnrollBlock | |
1631 vframeArray* old_array = vframe_array_last(); | |
1632 | |
1633 if (old_array != NULL) { | |
1634 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1635 old_array->set_unroll_block(NULL); | |
1636 delete old_info; | |
1637 delete old_array; | |
1638 } | |
1639 | |
1640 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1641 if (deferred != NULL) { | |
1642 // This can only happen if thread is destroyed before deoptimization occurs. | |
1643 assert(deferred->length() != 0, "empty array!"); | |
1644 do { | |
1645 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1646 deferred->remove_at(0); | |
1647 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1648 delete dlv; | |
1649 } while (deferred->length() != 0); | |
1650 delete deferred; | |
1651 } | |
1652 | |
1653 // All Java related clean up happens in exit | |
1654 ThreadSafepointState::destroy(this); | |
1655 if (_thread_profiler != NULL) delete _thread_profiler; | |
1656 if (_thread_stat != NULL) delete _thread_stat; | |
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1657 |
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|
1658 #ifdef GRAAL |
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|
1659 if (GraalCounterSize > 0 && graal_counters_include(threadObj())) { |
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|
1660 for (int i = 0; i < GraalCounterSize; i++) { |
11893
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Lukas Stadler <lukas.stadler@jku.at>
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1661 _graal_old_thread_counters[i] += _graal_counters[i]; |
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|
1662 } |
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1663 FREE_C_HEAP_ARRAY(jlong, _graal_counters, mtInternal); |
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|
1664 } |
13796
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Lukas Stadler <lukas.stadler@jku.at>
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|
1665 #endif // GRAAL |
0 | 1666 } |
1667 | |
1668 | |
1669 // The first routine called by a new Java thread | |
1670 void JavaThread::run() { | |
1671 // initialize thread-local alloc buffer related fields | |
1672 this->initialize_tlab(); | |
1673 | |
14309 | 1674 // used to test validity of stack trace backs |
0 | 1675 this->record_base_of_stack_pointer(); |
1676 | |
1677 // Record real stack base and size. | |
1678 this->record_stack_base_and_size(); | |
1679 | |
1680 // Initialize thread local storage; set before calling MutexLocker | |
1681 this->initialize_thread_local_storage(); | |
1682 | |
1683 this->create_stack_guard_pages(); | |
1684 | |
1681
126ea7725993
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1685 this->cache_global_variables(); |
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1686 |
0 | 1687 // Thread is now sufficient initialized to be handled by the safepoint code as being |
1688 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1689 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1690 | |
1691 assert(JavaThread::current() == this, "sanity check"); | |
1692 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1693 | |
1694 DTRACE_THREAD_PROBE(start, this); | |
1695 | |
1696 // This operation might block. We call that after all safepoint checks for a new thread has | |
1697 // been completed. | |
1698 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1699 | |
1700 if (JvmtiExport::should_post_thread_life()) { | |
1701 JvmtiExport::post_thread_start(this); | |
1702 } | |
1703 | |
10405 | 1704 EventThreadStart event; |
1705 if (event.should_commit()) { | |
1706 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj())); | |
1707 event.commit(); | |
1708 } | |
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1709 |
0 | 1710 // We call another function to do the rest so we are sure that the stack addresses used |
1711 // from there will be lower than the stack base just computed | |
1712 thread_main_inner(); | |
1713 | |
1714 // Note, thread is no longer valid at this point! | |
1715 } | |
1716 | |
1717 | |
1718 void JavaThread::thread_main_inner() { | |
1719 assert(JavaThread::current() == this, "sanity check"); | |
1720 assert(this->threadObj() != NULL, "just checking"); | |
1721 | |
2162
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1722 // Execute thread entry point unless this thread has a pending exception |
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1723 // or has been stopped before starting. |
0 | 1724 // Note: Due to JVM_StopThread we can have pending exceptions already! |
2162
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1725 if (!this->has_pending_exception() && |
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1726 !java_lang_Thread::is_stillborn(this->threadObj())) { |
4006 | 1727 { |
1728 ResourceMark rm(this); | |
1729 this->set_native_thread_name(this->get_thread_name()); | |
1730 } | |
0 | 1731 HandleMark hm(this); |
1732 this->entry_point()(this, this); | |
1733 } | |
1734 | |
1735 DTRACE_THREAD_PROBE(stop, this); | |
1736 | |
1737 this->exit(false); | |
1738 delete this; | |
1739 } | |
1740 | |
1741 | |
1742 static void ensure_join(JavaThread* thread) { | |
1743 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1744 Handle threadObj(thread, thread->threadObj()); | |
1745 assert(threadObj.not_null(), "java thread object must exist"); | |
1746 ObjectLocker lock(threadObj, thread); | |
1747 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1748 thread->clear_pending_exception(); | |
1749 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1750 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
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1751 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1752 // to complete once we've done the notify_all below |
0 | 1753 java_lang_Thread::set_thread(threadObj(), NULL); |
1754 lock.notify_all(thread); | |
1755 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1756 thread->clear_pending_exception(); | |
1757 } | |
1758 | |
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1759 |
0 | 1760 // For any new cleanup additions, please check to see if they need to be applied to |
1761 // cleanup_failed_attach_current_thread as well. | |
1762 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
1763 assert(this == JavaThread::current(), "thread consistency check"); | |
1764 | |
1765 HandleMark hm(this); | |
1766 Handle uncaught_exception(this, this->pending_exception()); | |
1767 this->clear_pending_exception(); | |
1768 Handle threadObj(this, this->threadObj()); | |
1769 assert(threadObj.not_null(), "Java thread object should be created"); | |
1770 | |
1771 if (get_thread_profiler() != NULL) { | |
1772 get_thread_profiler()->disengage(); | |
1773 ResourceMark rm; | |
1774 get_thread_profiler()->print(get_thread_name()); | |
1775 } | |
1776 | |
1777 | |
1778 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
1779 { | |
1780 EXCEPTION_MARK; | |
1781 | |
1782 CLEAR_PENDING_EXCEPTION; | |
1783 } | |
1784 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
1785 // has to be fixed by a runtime query method | |
1786 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
1787 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
1788 // java.lang.Thread.dispatchUncaughtException | |
1789 if (uncaught_exception.not_null()) { | |
1790 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
1791 { | |
1792 EXCEPTION_MARK; | |
1793 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
1794 // call it. Otherwise we have an older library without the JSR-166 changes, | |
1795 // so call ThreadGroup.uncaughtException() | |
1796 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
1797 CallInfo callinfo; | |
1142 | 1798 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1799 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
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1800 vmSymbols::dispatchUncaughtException_name(), |
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1801 vmSymbols::throwable_void_signature(), |
0 | 1802 KlassHandle(), false, false, THREAD); |
1803 CLEAR_PENDING_EXCEPTION; | |
1804 methodHandle method = callinfo.selected_method(); | |
1805 if (method.not_null()) { | |
1806 JavaValue result(T_VOID); | |
1807 JavaCalls::call_virtual(&result, | |
1808 threadObj, thread_klass, | |
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1809 vmSymbols::dispatchUncaughtException_name(), |
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1810 vmSymbols::throwable_void_signature(), |
0 | 1811 uncaught_exception, |
1812 THREAD); | |
1813 } else { | |
1142 | 1814 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 1815 JavaValue result(T_VOID); |
1816 JavaCalls::call_virtual(&result, | |
1817 group, thread_group, | |
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1818 vmSymbols::uncaughtException_name(), |
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1819 vmSymbols::thread_throwable_void_signature(), |
0 | 1820 threadObj, // Arg 1 |
1821 uncaught_exception, // Arg 2 | |
1822 THREAD); | |
1823 } | |
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1824 if (HAS_PENDING_EXCEPTION) { |
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1825 ResourceMark rm(this); |
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1826 jio_fprintf(defaultStream::error_stream(), |
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1827 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1828 " in thread \"%s\"\n", |
6983 | 1829 pending_exception()->klass()->external_name(), |
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1830 get_thread_name()); |
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1831 CLEAR_PENDING_EXCEPTION; |
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1832 } |
0 | 1833 } |
1834 } | |
1835 | |
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1836 // Called before the java thread exit since we want to read info |
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1837 // from java_lang_Thread object |
10405 | 1838 EventThreadEnd event; |
1839 if (event.should_commit()) { | |
1840 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj())); | |
1841 event.commit(); | |
1842 } | |
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1843 |
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1844 // Call after last event on thread |
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1845 EVENT_THREAD_EXIT(this); |
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1846 |
0 | 1847 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
1848 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1849 // is deprecated anyhow. | |
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1850 if (!is_Compiler_thread()) { |
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1851 int count = 3; |
0 | 1852 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { |
1853 EXCEPTION_MARK; | |
1854 JavaValue result(T_VOID); | |
1142 | 1855 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1856 JavaCalls::call_virtual(&result, |
1857 threadObj, thread_klass, | |
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1858 vmSymbols::exit_method_name(), |
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1859 vmSymbols::void_method_signature(), |
0 | 1860 THREAD); |
1861 CLEAR_PENDING_EXCEPTION; | |
1862 } | |
1863 } | |
1864 // notify JVMTI | |
1865 if (JvmtiExport::should_post_thread_life()) { | |
1866 JvmtiExport::post_thread_end(this); | |
1867 } | |
1868 | |
1869 // We have notified the agents that we are exiting, before we go on, | |
1870 // we must check for a pending external suspend request and honor it | |
1871 // in order to not surprise the thread that made the suspend request. | |
1872 while (true) { | |
1873 { | |
1874 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1875 if (!is_external_suspend()) { | |
1876 set_terminated(_thread_exiting); | |
1877 ThreadService::current_thread_exiting(this); | |
1878 break; | |
1879 } | |
1880 // Implied else: | |
1881 // Things get a little tricky here. We have a pending external | |
1882 // suspend request, but we are holding the SR_lock so we | |
1883 // can't just self-suspend. So we temporarily drop the lock | |
1884 // and then self-suspend. | |
1885 } | |
1886 | |
1887 ThreadBlockInVM tbivm(this); | |
1888 java_suspend_self(); | |
1889 | |
1890 // We're done with this suspend request, but we have to loop around | |
1891 // and check again. Eventually we will get SR_lock without a pending | |
1892 // external suspend request and will be able to mark ourselves as | |
1893 // exiting. | |
1894 } | |
1895 // no more external suspends are allowed at this point | |
1896 } else { | |
1897 // before_exit() has already posted JVMTI THREAD_END events | |
1898 } | |
1899 | |
1900 // Notify waiters on thread object. This has to be done after exit() is called | |
1901 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1902 // group should have the destroyed bit set before waiters are notified). | |
1903 ensure_join(this); | |
1904 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1905 | |
1906 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1907 // held by this thread must be released. A detach operation must only | |
1908 // get here if there are no Java frames on the stack. Therefore, any | |
1909 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1910 // pre-inflated and in the monitor cache. | |
1911 // | |
1912 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1913 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1914 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1915 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1916 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1917 } | |
1918 | |
1919 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1920 // is in a consistent state, in case GC happens | |
1921 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1922 | |
1923 if (active_handles() != NULL) { | |
1924 JNIHandleBlock* block = active_handles(); | |
1925 set_active_handles(NULL); | |
1926 JNIHandleBlock::release_block(block); | |
1927 } | |
1928 | |
1929 if (free_handle_block() != NULL) { | |
1930 JNIHandleBlock* block = free_handle_block(); | |
1931 set_free_handle_block(NULL); | |
1932 JNIHandleBlock::release_block(block); | |
1933 } | |
1934 | |
1935 // These have to be removed while this is still a valid thread. | |
1936 remove_stack_guard_pages(); | |
1937 | |
1938 if (UseTLAB) { | |
1939 tlab().make_parsable(true); // retire TLAB | |
1940 } | |
1941 | |
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1942 if (JvmtiEnv::environments_might_exist()) { |
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1943 JvmtiExport::cleanup_thread(this); |
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1944 } |
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1945 |
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1946 // We must flush any deferred card marks before removing a thread from |
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1947 // the list of active threads. |
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1948 Universe::heap()->flush_deferred_store_barrier(this); |
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1949 assert(deferred_card_mark().is_empty(), "Should have been flushed"); |
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1950 |
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1951 #if INCLUDE_ALL_GCS |
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1952 // We must flush the G1-related buffers before removing a thread |
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1953 // from the list of active threads. We must do this after any deferred |
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1954 // card marks have been flushed (above) so that any entries that are |
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1955 // added to the thread's dirty card queue as a result are not lost. |
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1956 if (UseG1GC) { |
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1957 flush_barrier_queues(); |
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1958 } |
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1959 #endif // INCLUDE_ALL_GCS |
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1960 |
0 | 1961 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1962 Threads::remove(this); | |
1963 } | |
1964 | |
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1965 #if INCLUDE_ALL_GCS |
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1966 // Flush G1-related queues. |
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1967 void JavaThread::flush_barrier_queues() { |
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1968 satb_mark_queue().flush(); |
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1969 dirty_card_queue().flush(); |
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1970 } |
1842
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1971 |
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1972 void JavaThread::initialize_queues() { |
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1973 assert(!SafepointSynchronize::is_at_safepoint(), |
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1974 "we should not be at a safepoint"); |
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1975 |
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1976 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1977 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1978 // The SATB queue should have been constructed with its active |
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1979 // field set to false. |
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1980 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1981 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1982 // If we are creating the thread during a marking cycle, we should |
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1983 // set the active field of the SATB queue to true. |
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1984 if (satb_queue_set.is_active()) { |
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1985 satb_queue.set_active(true); |
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1986 } |
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1987 |
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1988 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1989 // The dirty card queue should have been constructed with its |
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1990 // active field set to true. |
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1991 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1992 } |
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1993 #endif // INCLUDE_ALL_GCS |
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1994 |
0 | 1995 void JavaThread::cleanup_failed_attach_current_thread() { |
441
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1996 if (get_thread_profiler() != NULL) { |
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1997 get_thread_profiler()->disengage(); |
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1998 ResourceMark rm; |
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1999 get_thread_profiler()->print(get_thread_name()); |
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2000 } |
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2001 |
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2002 if (active_handles() != NULL) { |
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2003 JNIHandleBlock* block = active_handles(); |
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2004 set_active_handles(NULL); |
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2005 JNIHandleBlock::release_block(block); |
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2006 } |
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2007 |
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2008 if (free_handle_block() != NULL) { |
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2009 JNIHandleBlock* block = free_handle_block(); |
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2010 set_free_handle_block(NULL); |
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2011 JNIHandleBlock::release_block(block); |
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2012 } |
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2013 |
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2014 // These have to be removed while this is still a valid thread. |
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2015 remove_stack_guard_pages(); |
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2016 |
441
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2017 if (UseTLAB) { |
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2018 tlab().make_parsable(true); // retire TLAB, if any |
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2019 } |
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2020 |
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2021 #if INCLUDE_ALL_GCS |
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2022 if (UseG1GC) { |
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2023 flush_barrier_queues(); |
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2024 } |
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2025 #endif // INCLUDE_ALL_GCS |
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2026 |
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2027 Threads::remove(this); |
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2028 delete this; |
0 | 2029 } |
2030 | |
2031 | |
441
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2032 |
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2033 |
0 | 2034 JavaThread* JavaThread::active() { |
2035 Thread* thread = ThreadLocalStorage::thread(); | |
2036 assert(thread != NULL, "just checking"); | |
2037 if (thread->is_Java_thread()) { | |
2038 return (JavaThread*) thread; | |
2039 } else { | |
2040 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
2041 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
2042 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
2043 assert(ret->is_Java_thread(), "must be a Java thread"); | |
2044 return ret; | |
2045 } | |
2046 } | |
2047 | |
2048 bool JavaThread::is_lock_owned(address adr) const { | |
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2049 if (Thread::is_lock_owned(adr)) return true; |
0 | 2050 |
2051 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2052 if (chunk->contains(adr)) return true; | |
2053 } | |
2054 | |
2055 return false; | |
2056 } | |
2057 | |
2058 | |
2059 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
2060 chunk->set_next(monitor_chunks()); | |
2061 set_monitor_chunks(chunk); | |
2062 } | |
2063 | |
2064 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
2065 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
2066 if (monitor_chunks() == chunk) { | |
2067 set_monitor_chunks(chunk->next()); | |
2068 } else { | |
2069 MonitorChunk* prev = monitor_chunks(); | |
2070 while (prev->next() != chunk) prev = prev->next(); | |
2071 prev->set_next(chunk->next()); | |
2072 } | |
2073 } | |
2074 | |
2075 // JVM support. | |
2076 | |
2077 // Note: this function shouldn't block if it's called in | |
2078 // _thread_in_native_trans state (such as from | |
2079 // check_special_condition_for_native_trans()). | |
2080 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
2081 | |
2082 if (has_last_Java_frame() && has_async_condition()) { | |
2083 // If we are at a polling page safepoint (not a poll return) | |
2084 // then we must defer async exception because live registers | |
2085 // will be clobbered by the exception path. Poll return is | |
2086 // ok because the call we a returning from already collides | |
2087 // with exception handling registers and so there is no issue. | |
2088 // (The exception handling path kills call result registers but | |
2089 // this is ok since the exception kills the result anyway). | |
2090 | |
2091 if (is_at_poll_safepoint()) { | |
2092 // if the code we are returning to has deoptimized we must defer | |
2093 // the exception otherwise live registers get clobbered on the | |
2094 // exception path before deoptimization is able to retrieve them. | |
2095 // | |
2096 RegisterMap map(this, false); | |
2097 frame caller_fr = last_frame().sender(&map); | |
2098 assert(caller_fr.is_compiled_frame(), "what?"); | |
2099 if (caller_fr.is_deoptimized_frame()) { | |
2100 if (TraceExceptions) { | |
2101 ResourceMark rm; | |
2102 tty->print_cr("deferred async exception at compiled safepoint"); | |
2103 } | |
2104 return; | |
2105 } | |
2106 } | |
2107 } | |
2108 | |
2109 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
2110 if (condition == _no_async_condition) { | |
2111 // Conditions have changed since has_special_runtime_exit_condition() | |
2112 // was called: | |
2113 // - if we were here only because of an external suspend request, | |
2114 // then that was taken care of above (or cancelled) so we are done | |
2115 // - if we were here because of another async request, then it has | |
2116 // been cleared between the has_special_runtime_exit_condition() | |
2117 // and now so again we are done | |
2118 return; | |
2119 } | |
2120 | |
2121 // Check for pending async. exception | |
2122 if (_pending_async_exception != NULL) { | |
2123 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1142 | 2124 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2125 |
2126 // We cannot call Exceptions::_throw(...) here because we cannot block | |
2127 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
2128 | |
2129 if (TraceExceptions) { | |
2130 ResourceMark rm; | |
2131 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
2132 if (has_last_Java_frame() ) { | |
2133 frame f = last_frame(); | |
2134 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
2135 } | |
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2136 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2137 } |
2138 _pending_async_exception = NULL; | |
2139 clear_has_async_exception(); | |
2140 } | |
2141 } | |
2142 | |
2143 if (check_unsafe_error && | |
2144 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
2145 condition = _no_async_condition; // done | |
2146 switch (thread_state()) { | |
2147 case _thread_in_vm: | |
2148 { | |
2149 JavaThread* THREAD = this; | |
2150 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2151 } | |
2152 case _thread_in_native: | |
2153 { | |
2154 ThreadInVMfromNative tiv(this); | |
2155 JavaThread* THREAD = this; | |
2156 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2157 } | |
2158 case _thread_in_Java: | |
2159 { | |
2160 ThreadInVMfromJava tiv(this); | |
2161 JavaThread* THREAD = this; | |
2162 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
2163 } | |
2164 default: | |
2165 ShouldNotReachHere(); | |
2166 } | |
2167 } | |
2168 | |
2169 assert(condition == _no_async_condition || has_pending_exception() || | |
2170 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
2171 "must have handled the async condition, if no exception"); | |
2172 } | |
2173 | |
2174 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
2175 // | |
2176 // Check for pending external suspend. Internal suspend requests do | |
2177 // not use handle_special_runtime_exit_condition(). | |
2178 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2179 // thread is not the current thread. In older versions of jdbx, jdbx | |
2180 // threads could call into the VM with another thread's JNIEnv so we | |
2181 // can be here operating on behalf of a suspended thread (4432884). | |
2182 bool do_self_suspend = is_external_suspend_with_lock(); | |
2183 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
2184 // | |
2185 // Because thread is external suspended the safepoint code will count | |
2186 // thread as at a safepoint. This can be odd because we can be here | |
2187 // as _thread_in_Java which would normally transition to _thread_blocked | |
2188 // at a safepoint. We would like to mark the thread as _thread_blocked | |
2189 // before calling java_suspend_self like all other callers of it but | |
2190 // we must then observe proper safepoint protocol. (We can't leave | |
2191 // _thread_blocked with a safepoint in progress). However we can be | |
2192 // here as _thread_in_native_trans so we can't use a normal transition | |
2193 // constructor/destructor pair because they assert on that type of | |
2194 // transition. We could do something like: | |
2195 // | |
2196 // JavaThreadState state = thread_state(); | |
2197 // set_thread_state(_thread_in_vm); | |
2198 // { | |
2199 // ThreadBlockInVM tbivm(this); | |
2200 // java_suspend_self() | |
2201 // } | |
2202 // set_thread_state(_thread_in_vm_trans); | |
2203 // if (safepoint) block; | |
2204 // set_thread_state(state); | |
2205 // | |
2206 // but that is pretty messy. Instead we just go with the way the | |
2207 // code has worked before and note that this is the only path to | |
2208 // java_suspend_self that doesn't put the thread in _thread_blocked | |
2209 // mode. | |
2210 | |
2211 frame_anchor()->make_walkable(this); | |
2212 java_suspend_self(); | |
2213 | |
2214 // We might be here for reasons in addition to the self-suspend request | |
2215 // so check for other async requests. | |
2216 } | |
2217 | |
2218 if (check_asyncs) { | |
2219 check_and_handle_async_exceptions(); | |
2220 } | |
2221 } | |
2222 | |
2223 void JavaThread::send_thread_stop(oop java_throwable) { | |
2224 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
2225 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
2226 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
2227 | |
2228 // Do not throw asynchronous exceptions against the compiler thread | |
2229 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
2230 if (is_Compiler_thread()) return; | |
2231 | |
2232 { | |
2233 // Actually throw the Throwable against the target Thread - however | |
2234 // only if there is no thread death exception installed already. | |
1142 | 2235 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2236 // If the topmost frame is a runtime stub, then we are calling into |
2237 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
2238 // must deoptimize the caller before continuing, as the compiled exception handler table | |
2239 // may not be valid | |
2240 if (has_last_Java_frame()) { | |
2241 frame f = last_frame(); | |
2242 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
2243 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2244 RegisterMap reg_map(this, UseBiasedLocking); | |
2245 frame compiled_frame = f.sender(®_map); | |
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2246 if (!StressCompiledExceptionHandlers && compiled_frame.can_be_deoptimized()) { |
0 | 2247 Deoptimization::deoptimize(this, compiled_frame, ®_map); |
2248 } | |
2249 } | |
2250 } | |
2251 | |
2252 // Set async. pending exception in thread. | |
2253 set_pending_async_exception(java_throwable); | |
2254 | |
2255 if (TraceExceptions) { | |
2256 ResourceMark rm; | |
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2257 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2258 } |
2259 // for AbortVMOnException flag | |
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2260 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
0 | 2261 } |
2262 } | |
2263 | |
2264 | |
2265 // Interrupt thread so it will wake up from a potential wait() | |
2266 Thread::interrupt(this); | |
2267 } | |
2268 | |
2269 // External suspension mechanism. | |
2270 // | |
2271 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
2272 // to any VM_locks and it is at a transition | |
2273 // Self-suspension will happen on the transition out of the vm. | |
2274 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
2275 // | |
2276 // Guarantees on return: | |
2277 // + Target thread will not execute any new bytecode (that's why we need to | |
2278 // force a safepoint) | |
2279 // + Target thread will not enter any new monitors | |
2280 // | |
2281 void JavaThread::java_suspend() { | |
2282 { MutexLocker mu(Threads_lock); | |
2283 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
2284 return; | |
2285 } | |
2286 } | |
2287 | |
2288 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2289 if (!is_external_suspend()) { | |
2290 // a racing resume has cancelled us; bail out now | |
2291 return; | |
2292 } | |
2293 | |
2294 // suspend is done | |
2295 uint32_t debug_bits = 0; | |
2296 // Warning: is_ext_suspend_completed() may temporarily drop the | |
2297 // SR_lock to allow the thread to reach a stable thread state if | |
2298 // it is currently in a transient thread state. | |
2299 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
2300 SuspendRetryDelay, &debug_bits) ) { | |
2301 return; | |
2302 } | |
2303 } | |
2304 | |
2305 VM_ForceSafepoint vm_suspend; | |
2306 VMThread::execute(&vm_suspend); | |
2307 } | |
2308 | |
2309 // Part II of external suspension. | |
2310 // A JavaThread self suspends when it detects a pending external suspend | |
2311 // request. This is usually on transitions. It is also done in places | |
2312 // where continuing to the next transition would surprise the caller, | |
2313 // e.g., monitor entry. | |
2314 // | |
2315 // Returns the number of times that the thread self-suspended. | |
2316 // | |
2317 // Note: DO NOT call java_suspend_self() when you just want to block current | |
2318 // thread. java_suspend_self() is the second stage of cooperative | |
2319 // suspension for external suspend requests and should only be used | |
2320 // to complete an external suspend request. | |
2321 // | |
2322 int JavaThread::java_suspend_self() { | |
2323 int ret = 0; | |
2324 | |
2325 // we are in the process of exiting so don't suspend | |
2326 if (is_exiting()) { | |
2327 clear_external_suspend(); | |
2328 return ret; | |
2329 } | |
2330 | |
2331 assert(_anchor.walkable() || | |
2332 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
2333 "must have walkable stack"); | |
2334 | |
2335 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2336 | |
979 | 2337 assert(!this->is_ext_suspended(), |
0 | 2338 "a thread trying to self-suspend should not already be suspended"); |
2339 | |
2340 if (this->is_suspend_equivalent()) { | |
2341 // If we are self-suspending as a result of the lifting of a | |
2342 // suspend equivalent condition, then the suspend_equivalent | |
2343 // flag is not cleared until we set the ext_suspended flag so | |
2344 // that wait_for_ext_suspend_completion() returns consistent | |
2345 // results. | |
2346 this->clear_suspend_equivalent(); | |
2347 } | |
2348 | |
2349 // A racing resume may have cancelled us before we grabbed SR_lock | |
2350 // above. Or another external suspend request could be waiting for us | |
2351 // by the time we return from SR_lock()->wait(). The thread | |
2352 // that requested the suspension may already be trying to walk our | |
2353 // stack and if we return now, we can change the stack out from under | |
2354 // it. This would be a "bad thing (TM)" and cause the stack walker | |
2355 // to crash. We stay self-suspended until there are no more pending | |
2356 // external suspend requests. | |
2357 while (is_external_suspend()) { | |
2358 ret++; | |
2359 this->set_ext_suspended(); | |
2360 | |
2361 // _ext_suspended flag is cleared by java_resume() | |
2362 while (is_ext_suspended()) { | |
2363 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
2364 } | |
2365 } | |
2366 | |
2367 return ret; | |
2368 } | |
2369 | |
2370 #ifdef ASSERT | |
2371 // verify the JavaThread has not yet been published in the Threads::list, and | |
2372 // hence doesn't need protection from concurrent access at this stage | |
2373 void JavaThread::verify_not_published() { | |
2374 if (!Threads_lock->owned_by_self()) { | |
2375 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
2376 assert( !Threads::includes(this), | |
2377 "java thread shouldn't have been published yet!"); | |
2378 } | |
2379 else { | |
2380 assert( !Threads::includes(this), | |
2381 "java thread shouldn't have been published yet!"); | |
2382 } | |
2383 } | |
2384 #endif | |
2385 | |
2386 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2387 // progress or when _suspend_flags is non-zero. | |
2388 // Current thread needs to self-suspend if there is a suspend request and/or | |
2389 // block if a safepoint is in progress. | |
2390 // Async exception ISN'T checked. | |
2391 // Note only the ThreadInVMfromNative transition can call this function | |
2392 // directly and when thread state is _thread_in_native_trans | |
2393 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
2394 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
2395 | |
2396 JavaThread *curJT = JavaThread::current(); | |
2397 bool do_self_suspend = thread->is_external_suspend(); | |
2398 | |
2399 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
2400 | |
2401 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2402 // thread is not the current thread. In older versions of jdbx, jdbx | |
2403 // threads could call into the VM with another thread's JNIEnv so we | |
2404 // can be here operating on behalf of a suspended thread (4432884). | |
2405 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2406 JavaThreadState state = thread->thread_state(); | |
2407 | |
2408 // We mark this thread_blocked state as a suspend-equivalent so | |
2409 // that a caller to is_ext_suspend_completed() won't be confused. | |
2410 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2411 thread->set_suspend_equivalent(); | |
2412 | |
2413 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2414 // wait until the thread changes to other thread state. There is no | |
2415 // guarantee on how soon we can obtain the SR_lock and complete the | |
2416 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2417 // too long. Temporarily change the state to _thread_blocked to | |
2418 // let the VM thread know that this thread is ready for GC. The problem | |
2419 // of changing thread state is that safepoint could happen just after | |
2420 // java_suspend_self() returns after being resumed, and VM thread will | |
2421 // see the _thread_blocked state. We must check for safepoint | |
2422 // after restoring the state and make sure we won't leave while a safepoint | |
2423 // is in progress. | |
2424 thread->set_thread_state(_thread_blocked); | |
2425 thread->java_suspend_self(); | |
2426 thread->set_thread_state(state); | |
2427 // Make sure new state is seen by VM thread | |
2428 if (os::is_MP()) { | |
2429 if (UseMembar) { | |
2430 // Force a fence between the write above and read below | |
2431 OrderAccess::fence(); | |
2432 } else { | |
2433 // Must use this rather than serialization page in particular on Windows | |
2434 InterfaceSupport::serialize_memory(thread); | |
2435 } | |
2436 } | |
2437 } | |
2438 | |
2439 if (SafepointSynchronize::do_call_back()) { | |
2440 // If we are safepointing, then block the caller which may not be | |
2441 // the same as the target thread (see above). | |
2442 SafepointSynchronize::block(curJT); | |
2443 } | |
2444 | |
2445 if (thread->is_deopt_suspend()) { | |
2446 thread->clear_deopt_suspend(); | |
2447 RegisterMap map(thread, false); | |
2448 frame f = thread->last_frame(); | |
2449 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2450 f = f.sender(&map); | |
2451 } | |
2452 if (f.id() == thread->must_deopt_id()) { | |
2453 thread->clear_must_deopt_id(); | |
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2454 f.deoptimize(thread); |
0 | 2455 } else { |
2456 fatal("missed deoptimization!"); | |
2457 } | |
2458 } | |
2459 } | |
2460 | |
2461 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2462 // progress or when _suspend_flags is non-zero. | |
2463 // Current thread needs to self-suspend if there is a suspend request and/or | |
2464 // block if a safepoint is in progress. | |
2465 // Also check for pending async exception (not including unsafe access error). | |
2466 // Note only the native==>VM/Java barriers can call this function and when | |
2467 // thread state is _thread_in_native_trans. | |
2468 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2469 check_safepoint_and_suspend_for_native_trans(thread); | |
2470 | |
2471 if (thread->has_async_exception()) { | |
2472 // We are in _thread_in_native_trans state, don't handle unsafe | |
2473 // access error since that may block. | |
2474 thread->check_and_handle_async_exceptions(false); | |
2475 } | |
2476 } | |
2477 | |
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2478 // This is a variant of the normal |
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2479 // check_special_condition_for_native_trans with slightly different |
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2480 // semantics for use by critical native wrappers. It does all the |
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2481 // normal checks but also performs the transition back into |
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2482 // thread_in_Java state. This is required so that critical natives |
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2483 // can potentially block and perform a GC if they are the last thread |
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2484 // exiting the GC_locker. |
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2485 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
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2486 check_special_condition_for_native_trans(thread); |
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|
2487 |
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2488 // Finish the transition |
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2489 thread->set_thread_state(_thread_in_Java); |
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2490 |
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2491 if (thread->do_critical_native_unlock()) { |
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2492 ThreadInVMfromJavaNoAsyncException tiv(thread); |
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2493 GC_locker::unlock_critical(thread); |
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2494 thread->clear_critical_native_unlock(); |
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|
2495 } |
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|
2496 } |
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2497 |
0 | 2498 // We need to guarantee the Threads_lock here, since resumes are not |
2499 // allowed during safepoint synchronization | |
2500 // Can only resume from an external suspension | |
2501 void JavaThread::java_resume() { | |
2502 assert_locked_or_safepoint(Threads_lock); | |
2503 | |
2504 // Sanity check: thread is gone, has started exiting or the thread | |
2505 // was not externally suspended. | |
2506 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2507 return; | |
2508 } | |
2509 | |
2510 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2511 | |
2512 clear_external_suspend(); | |
2513 | |
2514 if (is_ext_suspended()) { | |
2515 clear_ext_suspended(); | |
2516 SR_lock()->notify_all(); | |
2517 } | |
2518 } | |
2519 | |
2520 void JavaThread::create_stack_guard_pages() { | |
2521 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2522 address low_addr = stack_base() - stack_size(); | |
2523 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2524 | |
2525 int allocate = os::allocate_stack_guard_pages(); | |
2526 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2527 | |
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|
2528 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
0 | 2529 warning("Attempt to allocate stack guard pages failed."); |
2530 return; | |
2531 } | |
2532 | |
2533 if (os::guard_memory((char *) low_addr, len)) { | |
2534 _stack_guard_state = stack_guard_enabled; | |
2535 } else { | |
2536 warning("Attempt to protect stack guard pages failed."); | |
2537 if (os::uncommit_memory((char *) low_addr, len)) { | |
2538 warning("Attempt to deallocate stack guard pages failed."); | |
2539 } | |
2540 } | |
2541 } | |
2542 | |
2543 void JavaThread::remove_stack_guard_pages() { | |
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2544 assert(Thread::current() == this, "from different thread"); |
0 | 2545 if (_stack_guard_state == stack_guard_unused) return; |
2546 address low_addr = stack_base() - stack_size(); | |
2547 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2548 | |
2549 if (os::allocate_stack_guard_pages()) { | |
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2550 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
0 | 2551 _stack_guard_state = stack_guard_unused; |
2552 } else { | |
2553 warning("Attempt to deallocate stack guard pages failed."); | |
2554 } | |
2555 } else { | |
2556 if (_stack_guard_state == stack_guard_unused) return; | |
2557 if (os::unguard_memory((char *) low_addr, len)) { | |
2558 _stack_guard_state = stack_guard_unused; | |
2559 } else { | |
2560 warning("Attempt to unprotect stack guard pages failed."); | |
2561 } | |
2562 } | |
2563 } | |
2564 | |
2565 void JavaThread::enable_stack_yellow_zone() { | |
2566 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2567 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2568 | |
2569 // The base notation is from the stacks point of view, growing downward. | |
2570 // We need to adjust it to work correctly with guard_memory() | |
2571 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2572 | |
2573 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2574 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2575 | |
2576 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2577 _stack_guard_state = stack_guard_enabled; | |
2578 } else { | |
2579 warning("Attempt to guard stack yellow zone failed."); | |
2580 } | |
2581 enable_register_stack_guard(); | |
2582 } | |
2583 | |
2584 void JavaThread::disable_stack_yellow_zone() { | |
2585 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2586 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2587 | |
2588 // Simply return if called for a thread that does not use guard pages. | |
2589 if (_stack_guard_state == stack_guard_unused) return; | |
2590 | |
2591 // The base notation is from the stacks point of view, growing downward. | |
2592 // We need to adjust it to work correctly with guard_memory() | |
2593 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2594 | |
2595 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2596 _stack_guard_state = stack_guard_yellow_disabled; | |
2597 } else { | |
2598 warning("Attempt to unguard stack yellow zone failed."); | |
2599 } | |
2600 disable_register_stack_guard(); | |
2601 } | |
2602 | |
2603 void JavaThread::enable_stack_red_zone() { | |
2604 // The base notation is from the stacks point of view, growing downward. | |
2605 // We need to adjust it to work correctly with guard_memory() | |
2606 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2607 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2608 | |
2609 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2610 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2611 | |
2612 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2613 warning("Attempt to guard stack red zone failed."); | |
2614 } | |
2615 } | |
2616 | |
2617 void JavaThread::disable_stack_red_zone() { | |
2618 // The base notation is from the stacks point of view, growing downward. | |
2619 // We need to adjust it to work correctly with guard_memory() | |
2620 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2621 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2622 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2623 warning("Attempt to unguard stack red zone failed."); | |
2624 } | |
2625 } | |
2626 | |
2627 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2628 // ignore is there is no stack | |
2629 if (!has_last_Java_frame()) return; | |
2630 // traverse the stack frames. Starts from top frame. | |
2631 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2632 frame* fr = fst.current(); | |
2633 f(fr, fst.register_map()); | |
2634 } | |
2635 } | |
2636 | |
2637 | |
2638 #ifndef PRODUCT | |
2639 // Deoptimization | |
2640 // Function for testing deoptimization | |
2641 void JavaThread::deoptimize() { | |
2642 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2643 StackFrameStream fst(this, UseBiasedLocking); | |
2644 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2645 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2646 // Iterate over all frames in the thread and deoptimize | |
2647 for(; !fst.is_done(); fst.next()) { | |
2648 if(fst.current()->can_be_deoptimized()) { | |
2649 | |
2650 if (only_at) { | |
2651 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2652 // consists of comma or carriage return separated numbers so | |
2653 // search for the current bci in that string. | |
2654 address pc = fst.current()->pc(); | |
2655 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2656 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2657 char buffer[8]; | |
2658 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2659 size_t len = strlen(buffer); | |
2660 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2661 while (found != NULL) { | |
2662 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2663 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2664 // Check that the bci found is bracketed by terminators. | |
2665 break; | |
2666 } | |
2667 found = strstr(found + 1, buffer); | |
2668 } | |
2669 if (!found) { | |
2670 continue; | |
2671 } | |
2672 } | |
2673 | |
2674 if (DebugDeoptimization && !deopt) { | |
2675 deopt = true; // One-time only print before deopt | |
2676 tty->print_cr("[BEFORE Deoptimization]"); | |
2677 trace_frames(); | |
2678 trace_stack(); | |
2679 } | |
2680 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2681 } | |
2682 } | |
2683 | |
2684 if (DebugDeoptimization && deopt) { | |
2685 tty->print_cr("[AFTER Deoptimization]"); | |
2686 trace_frames(); | |
2687 } | |
2688 } | |
2689 | |
2690 | |
2691 // Make zombies | |
2692 void JavaThread::make_zombies() { | |
2693 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2694 if (fst.current()->can_be_deoptimized()) { | |
2695 // it is a Java nmethod | |
2696 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2697 nm->make_not_entrant(); | |
2698 } | |
2699 } | |
2700 } | |
2701 #endif // PRODUCT | |
2702 | |
2703 | |
2704 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2705 if (!has_last_Java_frame()) return; | |
2706 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2707 StackFrameStream fst(this, UseBiasedLocking); | |
2708 for(; !fst.is_done(); fst.next()) { | |
2709 if (fst.current()->should_be_deoptimized()) { | |
6843 | 2710 if (LogCompilation && xtty != NULL) { |
2711 nmethod* nm = fst.current()->cb()->as_nmethod_or_null(); | |
2712 xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'", | |
2713 this->name(), nm != NULL ? nm->compile_id() : -1); | |
2714 } | |
2715 | |
0 | 2716 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); |
2717 } | |
2718 } | |
2719 } | |
2720 | |
2721 | |
2722 // GC support | |
2723 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2724 | |
2725 void JavaThread::gc_epilogue() { | |
2726 frames_do(frame_gc_epilogue); | |
2727 } | |
2728 | |
2729 | |
2730 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2731 | |
2732 void JavaThread::gc_prologue() { | |
2733 frames_do(frame_gc_prologue); | |
2734 } | |
2735 | |
1119
547f81740344
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parents:
1115
diff
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|
2736 // If the caller is a NamedThread, then remember, in the current scope, |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2737 // the given JavaThread in its _processed_thread field. |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2738 class RememberProcessedThread: public StackObj { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
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1115
diff
changeset
|
2739 NamedThread* _cur_thr; |
547f81740344
6361589: Print out stack trace for target thread of GC crash
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1115
diff
changeset
|
2740 public: |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
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1115
diff
changeset
|
2741 RememberProcessedThread(JavaThread* jthr) { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2742 Thread* thread = Thread::current(); |
547f81740344
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minqi
parents:
1115
diff
changeset
|
2743 if (thread->is_Named_thread()) { |
547f81740344
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minqi
parents:
1115
diff
changeset
|
2744 _cur_thr = (NamedThread *)thread; |
547f81740344
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diff
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|
2745 _cur_thr->set_processed_thread(jthr); |
547f81740344
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diff
changeset
|
2746 } else { |
547f81740344
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parents:
1115
diff
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|
2747 _cur_thr = NULL; |
547f81740344
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diff
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|
2748 } |
547f81740344
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diff
changeset
|
2749 } |
547f81740344
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diff
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|
2750 |
547f81740344
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diff
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|
2751 ~RememberProcessedThread() { |
547f81740344
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diff
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|
2752 if (_cur_thr) { |
547f81740344
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1115
diff
changeset
|
2753 _cur_thr->set_processed_thread(NULL); |
547f81740344
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diff
changeset
|
2754 } |
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|
2755 } |
547f81740344
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diff
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|
2756 }; |
0 | 2757 |
14483
be0ac0e8f6e7
8035393: Use CLDClosure instead of CLDToOopClosure in frame::oops_interpreted_do
stefank
parents:
14314
diff
changeset
|
2758 void JavaThread::oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf) { |
1166 | 2759 // Verify that the deferred card marks have been flushed. |
2760 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
997
diff
changeset
|
2761 |
0 | 2762 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
2763 // since there may be more than one thread using each ThreadProfiler. | |
2764 | |
2765 // Traverse the GCHandles | |
7179
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stefank
parents:
7177
diff
changeset
|
2766 Thread::oops_do(f, cld_f, cf); |
0 | 2767 |
2768 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2769 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2770 | |
2771 if (has_last_Java_frame()) { | |
1119
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diff
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|
2772 // Record JavaThread to GC thread |
547f81740344
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parents:
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diff
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|
2773 RememberProcessedThread rpt(this); |
0 | 2774 |
2775 // Traverse the privileged stack | |
2776 if (_privileged_stack_top != NULL) { | |
2777 _privileged_stack_top->oops_do(f); | |
2778 } | |
2779 | |
2780 // traverse the registered growable array | |
2781 if (_array_for_gc != NULL) { | |
2782 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2783 f->do_oop(_array_for_gc->adr_at(index)); | |
2784 } | |
2785 } | |
2786 | |
2787 // Traverse the monitor chunks | |
2788 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2789 chunk->oops_do(f); | |
2790 } | |
2791 | |
2792 // Traverse the execution stack | |
2793 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
7179
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stefank
parents:
7177
diff
changeset
|
2794 fst.current()->oops_do(f, cld_f, cf, fst.register_map()); |
0 | 2795 } |
2796 } | |
2797 | |
2798 // callee_target is never live across a gc point so NULL it here should | |
2799 // it still contain a methdOop. | |
2800 | |
2801 set_callee_target(NULL); | |
2802 | |
2803 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2804 // If we have deferred set_locals there might be oops waiting to be | |
2805 // written | |
2806 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2807 if (list != NULL) { | |
2808 for (int i = 0; i < list->length(); i++) { | |
2809 list->at(i)->oops_do(f); | |
2810 } | |
2811 } | |
2812 | |
2813 // Traverse instance variables at the end since the GC may be moving things | |
2814 // around using this function | |
2815 f->do_oop((oop*) &_threadObj); | |
2816 f->do_oop((oop*) &_vm_result); | |
2817 f->do_oop((oop*) &_exception_oop); | |
2818 f->do_oop((oop*) &_pending_async_exception); | |
2819 | |
2820 if (jvmti_thread_state() != NULL) { | |
2821 jvmti_thread_state()->oops_do(f); | |
2822 } | |
3696
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2823 |
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2824 if (_scanned_nmethod != NULL && cf != NULL) { |
7212
291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
Doug Simon <doug.simon@oracle.com>
diff
changeset
|
2825 // Safepoints can occur when the sweeper is scanning an nmethod so |
291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
Doug Simon <doug.simon@oracle.com>
diff
changeset
|
2826 // process it here to make sure it isn't unloaded in the middle of |
291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
Doug Simon <doug.simon@oracle.com>
diff
changeset
|
2827 // a scan. |
291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
Doug Simon <doug.simon@oracle.com>
diff
changeset
|
2828 cf->do_code_blob(_scanned_nmethod); |
291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
Doug Simon <doug.simon@oracle.com>
diff
changeset
|
2829 } |
0 | 2830 } |
2831 | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2832 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2833 Thread::nmethods_do(cf); // (super method is a no-op) |
0 | 2834 |
2835 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2836 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2837 | |
2838 if (has_last_Java_frame()) { | |
2839 // Traverse the execution stack | |
2840 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2841 fst.current()->nmethods_do(cf); |
0 | 2842 } |
2843 } | |
2844 } | |
2845 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2846 void JavaThread::metadata_do(void f(Metadata*)) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2847 Thread::metadata_do(f); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2848 if (has_last_Java_frame()) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2849 // Traverse the execution stack to call f() on the methods in the stack |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2850 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2851 fst.current()->metadata_do(f); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2852 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2853 } else if (is_Compiler_thread()) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2854 // need to walk ciMetadata in current compile tasks to keep alive. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2855 CompilerThread* ct = (CompilerThread*)this; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2856 if (ct->env() != NULL) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2857 ct->env()->metadata_do(f); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2858 } |
da91efe96a93
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coleenp
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6198
diff
changeset
|
2859 } |
da91efe96a93
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parents:
6198
diff
changeset
|
2860 } |
da91efe96a93
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diff
changeset
|
2861 |
0 | 2862 // Printing |
2863 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2864 switch (_thread_state) { | |
2865 case _thread_uninitialized: return "_thread_uninitialized"; | |
2866 case _thread_new: return "_thread_new"; | |
2867 case _thread_new_trans: return "_thread_new_trans"; | |
2868 case _thread_in_native: return "_thread_in_native"; | |
2869 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2870 case _thread_in_vm: return "_thread_in_vm"; | |
2871 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2872 case _thread_in_Java: return "_thread_in_Java"; | |
2873 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2874 case _thread_blocked: return "_thread_blocked"; | |
2875 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2876 default: return "unknown thread state"; | |
2877 } | |
2878 } | |
2879 | |
2880 #ifndef PRODUCT | |
2881 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2882 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2883 }; | |
2884 void JavaThread::print_thread_state() const { | |
2885 print_thread_state_on(tty); | |
2886 }; | |
2887 #endif // PRODUCT | |
2888 | |
2889 // Called by Threads::print() for VM_PrintThreads operation | |
2890 void JavaThread::print_on(outputStream *st) const { | |
2891 st->print("\"%s\" ", get_thread_name()); | |
2892 oop thread_oop = threadObj(); | |
6766 | 2893 if (thread_oop != NULL) { |
2894 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); | |
2895 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2896 st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); | |
2897 } | |
0 | 2898 Thread::print_on(st); |
2899 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
2900 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
0 | 2901 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
2902 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2903 } | |
2904 #ifndef PRODUCT | |
2905 print_thread_state_on(st); | |
2906 _safepoint_state->print_on(st); | |
2907 #endif // PRODUCT | |
2908 } | |
2909 | |
2910 // Called by fatal error handler. The difference between this and | |
2911 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2912 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2913 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2914 oop thread_obj = threadObj(); | |
2915 if (thread_obj != NULL) { | |
2916 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2917 } | |
2918 st->print(" ["); | |
2919 st->print("%s", _get_thread_state_name(_thread_state)); | |
2920 if (osthread()) { | |
2921 st->print(", id=%d", osthread()->thread_id()); | |
2922 } | |
2923 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2924 _stack_base - _stack_size, _stack_base); | |
2925 st->print("]"); | |
2926 return; | |
2927 } | |
2928 | |
2929 // Verification | |
2930 | |
2931 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2932 | |
2933 void JavaThread::verify() { | |
2934 // Verify oops in the thread. | |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
2935 oops_do(&VerifyOopClosure::verify_oop, NULL, NULL); |
0 | 2936 |
2937 // Verify the stack frames. | |
2938 frames_do(frame_verify); | |
2939 } | |
2940 | |
2941 // CR 6300358 (sub-CR 2137150) | |
2942 // Most callers of this method assume that it can't return NULL but a | |
2943 // thread may not have a name whilst it is in the process of attaching to | |
2944 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2945 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2946 // if vm exit occurs during initialization). These cases can all be accounted | |
2947 // for such that this method never returns NULL. | |
2948 const char* JavaThread::get_thread_name() const { | |
2949 #ifdef ASSERT | |
2950 // early safepoints can hit while current thread does not yet have TLS | |
2951 if (!SafepointSynchronize::is_at_safepoint()) { | |
2952 Thread *cur = Thread::current(); | |
2953 if (!(cur->is_Java_thread() && cur == this)) { | |
2954 // Current JavaThreads are allowed to get their own name without | |
2955 // the Threads_lock. | |
2956 assert_locked_or_safepoint(Threads_lock); | |
2957 } | |
2958 } | |
2959 #endif // ASSERT | |
2960 return get_thread_name_string(); | |
2961 } | |
2962 | |
2963 // Returns a non-NULL representation of this thread's name, or a suitable | |
2964 // descriptive string if there is no set name | |
2965 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2966 const char* name_str; | |
2967 oop thread_obj = threadObj(); | |
2968 if (thread_obj != NULL) { | |
2969 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2970 if (name != NULL) { | |
2971 if (buf == NULL) { | |
2972 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2973 } | |
2974 else { | |
2975 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2976 } | |
2977 } | |
4006 | 2978 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
0 | 2979 name_str = "<no-name - thread is attaching>"; |
2980 } | |
2981 else { | |
2982 name_str = Thread::name(); | |
2983 } | |
2984 } | |
2985 else { | |
2986 name_str = Thread::name(); | |
2987 } | |
2988 assert(name_str != NULL, "unexpected NULL thread name"); | |
2989 return name_str; | |
2990 } | |
2991 | |
2992 | |
2993 const char* JavaThread::get_threadgroup_name() const { | |
2994 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2995 oop thread_obj = threadObj(); | |
2996 if (thread_obj != NULL) { | |
2997 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2998 if (thread_group != NULL) { | |
2999 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
3000 // ThreadGroup.name can be null | |
3001 if (name != NULL) { | |
3002 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
3003 return str; | |
3004 } | |
3005 } | |
3006 } | |
3007 return NULL; | |
3008 } | |
3009 | |
3010 const char* JavaThread::get_parent_name() const { | |
3011 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
3012 oop thread_obj = threadObj(); | |
3013 if (thread_obj != NULL) { | |
3014 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
3015 if (thread_group != NULL) { | |
3016 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
3017 if (parent != NULL) { | |
3018 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
3019 // ThreadGroup.name can be null | |
3020 if (name != NULL) { | |
3021 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
3022 return str; | |
3023 } | |
3024 } | |
3025 } | |
3026 } | |
3027 return NULL; | |
3028 } | |
3029 | |
3030 ThreadPriority JavaThread::java_priority() const { | |
3031 oop thr_oop = threadObj(); | |
3032 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
3033 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
3034 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
3035 return priority; | |
3036 } | |
3037 | |
3038 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
3039 | |
3040 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
3041 // Link Java Thread object <-> C++ Thread | |
3042 | |
3043 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
3044 // and put it into a new Handle. The Handle "thread_oop" can then | |
3045 // be used to pass the C++ thread object to other methods. | |
3046 | |
3047 // Set the Java level thread object (jthread) field of the | |
3048 // new thread (a JavaThread *) to C++ thread object using the | |
3049 // "thread_oop" handle. | |
3050 | |
3051 // Set the thread field (a JavaThread *) of the | |
3052 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
3053 | |
3054 Handle thread_oop(Thread::current(), | |
3055 JNIHandles::resolve_non_null(jni_thread)); | |
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3056 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
0 | 3057 "must be initialized"); |
3058 set_threadObj(thread_oop()); | |
3059 java_lang_Thread::set_thread(thread_oop(), this); | |
3060 | |
3061 if (prio == NoPriority) { | |
3062 prio = java_lang_Thread::priority(thread_oop()); | |
3063 assert(prio != NoPriority, "A valid priority should be present"); | |
3064 } | |
3065 | |
3066 // Push the Java priority down to the native thread; needs Threads_lock | |
3067 Thread::set_priority(this, prio); | |
3068 | |
3069 // Add the new thread to the Threads list and set it in motion. | |
3070 // We must have threads lock in order to call Threads::add. | |
3071 // It is crucial that we do not block before the thread is | |
3072 // added to the Threads list for if a GC happens, then the java_thread oop | |
3073 // will not be visited by GC. | |
3074 Threads::add(this); | |
3075 } | |
3076 | |
3077 oop JavaThread::current_park_blocker() { | |
3078 // Support for JSR-166 locks | |
3079 oop thread_oop = threadObj(); | |
242 | 3080 if (thread_oop != NULL && |
3081 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 3082 return java_lang_Thread::park_blocker(thread_oop); |
3083 } | |
3084 return NULL; | |
3085 } | |
3086 | |
3087 | |
3088 void JavaThread::print_stack_on(outputStream* st) { | |
3089 if (!has_last_Java_frame()) return; | |
3090 ResourceMark rm; | |
3091 HandleMark hm; | |
3092 | |
3093 RegisterMap reg_map(this); | |
3094 vframe* start_vf = last_java_vframe(®_map); | |
3095 int count = 0; | |
3096 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3097 if (f->is_java_frame()) { | |
3098 javaVFrame* jvf = javaVFrame::cast(f); | |
3099 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
3100 | |
3101 // Print out lock information | |
3102 if (JavaMonitorsInStackTrace) { | |
3103 jvf->print_lock_info_on(st, count); | |
3104 } | |
3105 } else { | |
3106 // Ignore non-Java frames | |
3107 } | |
3108 | |
3109 // Bail-out case for too deep stacks | |
3110 count++; | |
3111 if (MaxJavaStackTraceDepth == count) return; | |
3112 } | |
3113 } | |
3114 | |
3115 | |
3116 // JVMTI PopFrame support | |
3117 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
3118 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
3119 if (in_bytes(size_in_bytes) != 0) { | |
6197 | 3120 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
0 | 3121 _popframe_preserved_args_size = in_bytes(size_in_bytes); |
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3122 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
0 | 3123 } |
3124 } | |
3125 | |
3126 void* JavaThread::popframe_preserved_args() { | |
3127 return _popframe_preserved_args; | |
3128 } | |
3129 | |
3130 ByteSize JavaThread::popframe_preserved_args_size() { | |
3131 return in_ByteSize(_popframe_preserved_args_size); | |
3132 } | |
3133 | |
3134 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
3135 int sz = in_bytes(popframe_preserved_args_size()); | |
3136 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
3137 return in_WordSize(sz / wordSize); | |
3138 } | |
3139 | |
3140 void JavaThread::popframe_free_preserved_args() { | |
3141 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
6197 | 3142 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
0 | 3143 _popframe_preserved_args = NULL; |
3144 _popframe_preserved_args_size = 0; | |
3145 } | |
3146 | |
3147 #ifndef PRODUCT | |
3148 | |
3149 void JavaThread::trace_frames() { | |
3150 tty->print_cr("[Describe stack]"); | |
3151 int frame_no = 1; | |
3152 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
3153 tty->print(" %d. ", frame_no++); | |
3154 fst.current()->print_value_on(tty,this); | |
3155 tty->cr(); | |
3156 } | |
3157 } | |
3158 | |
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3159 class PrintAndVerifyOopClosure: public OopClosure { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3160 protected: |
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|
3161 template <class T> inline void do_oop_work(T* p) { |
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|
3162 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
3163 if (obj == NULL) return; |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3164 tty->print(INTPTR_FORMAT ": ", p); |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3165 if (obj->is_oop_or_null()) { |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3166 if (obj->is_objArray()) { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3167 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3168 } else { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3169 obj->print(); |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3170 } |
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|
3171 } else { |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3172 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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|
3173 } |
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|
3174 tty->cr(); |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3175 } |
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parents:
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|
3176 public: |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
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changeset
|
3177 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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|
3178 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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|
3179 }; |
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|
3180 |
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|
3181 |
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|
3182 static void oops_print(frame* f, const RegisterMap *map) { |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3183 PrintAndVerifyOopClosure print; |
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|
3184 f->print_value(); |
7179
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8003720: NPG: Method in interpreter stack frame can be deallocated
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7177
diff
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|
3185 f->oops_do(&print, NULL, NULL, (RegisterMap*)map); |
3908
7588156f5cf9
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|
3186 } |
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parents:
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|
3187 |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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|
3188 // Print our all the locations that contain oops and whether they are |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3189 // valid or not. This useful when trying to find the oldest frame |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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changeset
|
3190 // 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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changeset
|
3191 // oldest. |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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|
3192 void JavaThread::trace_oops() { |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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changeset
|
3193 tty->print_cr("[Trace oops]"); |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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|
3194 frames_do(oops_print); |
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parents:
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|
3195 } |
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|
3196 |
0 | 3197 |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
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|
3198 #ifdef ASSERT |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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2416
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|
3199 // 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:
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diff
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|
3200 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:
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changeset
|
3201 ResourceMark rm; |
2e038ad0c1d0
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parents:
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|
3202 PRESERVE_EXCEPTION_MARK; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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changeset
|
3203 FrameValues values; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
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changeset
|
3204 int frame_no = 0; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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changeset
|
3205 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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changeset
|
3206 fst.current()->describe(values, ++frame_no); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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diff
changeset
|
3207 if (depth == frame_no) break; |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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diff
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|
3208 } |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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diff
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|
3209 if (validate_only) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
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diff
changeset
|
3210 values.validate(); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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|
3211 } else { |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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changeset
|
3212 tty->print_cr("[Describe stack layout]"); |
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b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
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diff
changeset
|
3213 values.print(this); |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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|
3214 } |
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|
3215 } |
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a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
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|
3216 #endif |
3336
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|
3217 |
0 | 3218 void JavaThread::trace_stack_from(vframe* start_vf) { |
3219 ResourceMark rm; | |
3220 int vframe_no = 1; | |
3221 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3222 if (f->is_java_frame()) { | |
3223 javaVFrame::cast(f)->print_activation(vframe_no++); | |
3224 } else { | |
3225 f->print(); | |
3226 } | |
3227 if (vframe_no > StackPrintLimit) { | |
3228 tty->print_cr("...<more frames>..."); | |
3229 return; | |
3230 } | |
3231 } | |
3232 } | |
3233 | |
3234 | |
3235 void JavaThread::trace_stack() { | |
3236 if (!has_last_Java_frame()) return; | |
3237 ResourceMark rm; | |
3238 HandleMark hm; | |
3239 RegisterMap reg_map(this); | |
3240 trace_stack_from(last_java_vframe(®_map)); | |
3241 } | |
3242 | |
3243 | |
3244 #endif // PRODUCT | |
3245 | |
3246 | |
3247 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
3248 assert(reg_map != NULL, "a map must be given"); | |
3249 frame f = last_frame(); | |
3250 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
3251 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
3252 } | |
3253 return NULL; | |
3254 } | |
3255 | |
3256 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
3257 Klass* JavaThread::security_get_caller_class(int depth) { |
0 | 3258 vframeStream vfst(this); |
3259 vfst.security_get_caller_frame(depth); | |
3260 if (!vfst.at_end()) { | |
3261 return vfst.method()->method_holder(); | |
3262 } | |
3263 return NULL; | |
3264 } | |
3265 | |
3266 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
3267 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
3268 CompileBroker::compiler_thread_loop(); | |
3269 } | |
3270 | |
3271 // Create a CompilerThread | |
3272 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
3273 : JavaThread(&compiler_thread_entry) { | |
3274 _env = NULL; | |
3275 _log = NULL; | |
3276 _task = NULL; | |
3277 _queue = queue; | |
3278 _counters = counters; | |
1584 | 3279 _buffer_blob = NULL; |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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|
3280 _scanned_nmethod = NULL; |
12880
469216acdb28
8023014: CodeSweeperSweepNoFlushTest.java fails with HS crash
anoll
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12316
diff
changeset
|
3281 _compiler = NULL; |
0 | 3282 |
3283 #ifndef PRODUCT | |
3284 _ideal_graph_printer = NULL; | |
3285 #endif | |
3286 } | |
3287 | |
14483
be0ac0e8f6e7
8035393: Use CLDClosure instead of CLDToOopClosure in frame::oops_interpreted_do
stefank
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changeset
|
3288 void CompilerThread::oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf) { |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
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7177
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changeset
|
3289 JavaThread::oops_do(f, cld_f, cf); |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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|
3290 if (_scanned_nmethod != NULL && cf != NULL) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3291 // Safepoints can occur when the sweeper is scanning an nmethod so |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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parents:
3336
diff
changeset
|
3292 // process it here to make sure it isn't unloaded in the middle of |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3293 // a scan. |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3294 cf->do_code_blob(_scanned_nmethod); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3295 } |
f52ed367b66d
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3336
diff
changeset
|
3296 } |
0 | 3297 |
12880
469216acdb28
8023014: CodeSweeperSweepNoFlushTest.java fails with HS crash
anoll
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|
3298 |
0 | 3299 // ======= Threads ======== |
3300 | |
3301 // The Threads class links together all active threads, and provides | |
3302 // operations over all threads. It is protected by its own Mutex | |
3303 // lock, which is also used in other contexts to protect thread | |
3304 // operations from having the thread being operated on from exiting | |
3305 // and going away unexpectedly (e.g., safepoint synchronization) | |
3306 | |
3307 JavaThread* Threads::_thread_list = NULL; | |
3308 int Threads::_number_of_threads = 0; | |
3309 int Threads::_number_of_non_daemon_threads = 0; | |
3310 int Threads::_return_code = 0; | |
3311 size_t JavaThread::_stack_size_at_create = 0; | |
6725
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3312 #ifdef ASSERT |
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3313 bool Threads::_vm_complete = false; |
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3314 #endif |
0 | 3315 |
3316 // All JavaThreads | |
3317 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
3318 | |
3319 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
3320 void Threads::threads_do(ThreadClosure* tc) { | |
3321 assert_locked_or_safepoint(Threads_lock); | |
3322 // ALL_JAVA_THREADS iterates through all JavaThreads | |
3323 ALL_JAVA_THREADS(p) { | |
3324 tc->do_thread(p); | |
3325 } | |
3326 // Someday we could have a table or list of all non-JavaThreads. | |
3327 // For now, just manually iterate through them. | |
3328 tc->do_thread(VMThread::vm_thread()); | |
3329 Universe::heap()->gc_threads_do(tc); | |
323
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3330 WatcherThread *wt = WatcherThread::watcher_thread(); |
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3331 // Strictly speaking, the following NULL check isn't sufficient to make sure |
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3332 // the data for WatcherThread is still valid upon being examined. However, |
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3333 // considering that WatchThread terminates when the VM is on the way to |
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3334 // exit at safepoint, the chance of the above is extremely small. The right |
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3335 // way to prevent termination of WatcherThread would be to acquire |
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3336 // Terminator_lock, but we can't do that without violating the lock rank |
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3337 // checking in some cases. |
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3338 if (wt != NULL) |
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3339 tc->do_thread(wt); |
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3340 |
0 | 3341 // If CompilerThreads ever become non-JavaThreads, add them here |
3342 } | |
3343 | |
14297
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3344 |
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|
3345 void Threads::initialize_java_lang_classes(JavaThread* main_thread, TRAPS) { |
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|
3346 TraceTime timer("Initialize java.lang classes", TraceStartupTime); |
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3347 |
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|
3348 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { |
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|
3349 create_vm_init_libraries(); |
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|
3350 } |
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|
3351 |
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|
3352 initialize_class(vmSymbols::java_lang_String(), CHECK); |
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3353 |
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|
3354 // Initialize java_lang.System (needed before creating the thread) |
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|
3355 initialize_class(vmSymbols::java_lang_System(), CHECK); |
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3356 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK); |
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|
3357 Handle thread_group = create_initial_thread_group(CHECK); |
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|
3358 Universe::set_main_thread_group(thread_group()); |
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3359 initialize_class(vmSymbols::java_lang_Thread(), CHECK); |
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|
3360 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK); |
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|
3361 main_thread->set_threadObj(thread_object); |
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|
3362 // Set thread status to running since main thread has |
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|
3363 // been started and running. |
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|
3364 java_lang_Thread::set_thread_status(thread_object, |
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|
3365 java_lang_Thread::RUNNABLE); |
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|
3366 |
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3367 // The VM creates & returns objects of this class. Make sure it's initialized. |
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|
3368 initialize_class(vmSymbols::java_lang_Class(), CHECK); |
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|
3369 |
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|
3370 // The VM preresolves methods to these classes. Make sure that they get initialized |
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|
3371 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK); |
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3372 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK); |
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|
3373 call_initializeSystemClass(CHECK); |
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|
3374 |
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|
3375 // get the Java runtime name after java.lang.System is initialized |
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|
3376 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); |
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|
3377 JDK_Version::set_runtime_version(get_java_runtime_version(THREAD)); |
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|
3378 |
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|
3379 // an instance of OutOfMemory exception has been allocated earlier |
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|
3380 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK); |
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|
3381 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK); |
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|
3382 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK); |
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|
3383 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK); |
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|
3384 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK); |
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|
3385 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK); |
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|
3386 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK); |
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|
3387 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK); |
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|
3388 } |
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|
3389 |
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|
3390 void Threads::initialize_jsr292_core_classes(TRAPS) { |
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|
3391 initialize_class(vmSymbols::java_lang_invoke_MethodHandle(), CHECK); |
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|
3392 initialize_class(vmSymbols::java_lang_invoke_MemberName(), CHECK); |
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|
3393 initialize_class(vmSymbols::java_lang_invoke_MethodHandleNatives(), CHECK); |
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|
3394 } |
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|
3395 |
0 | 3396 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { |
3397 | |
242 | 3398 extern void JDK_Version_init(); |
3399 | |
0 | 3400 // Check version |
3401 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
3402 | |
3403 // Initialize the output stream module | |
3404 ostream_init(); | |
3405 | |
3406 // Process java launcher properties. | |
3407 Arguments::process_sun_java_launcher_properties(args); | |
3408 | |
3409 // Initialize the os module before using TLS | |
3410 os::init(); | |
3411 | |
3412 // Initialize system properties. | |
3413 Arguments::init_system_properties(); | |
3414 | |
14309 | 3415 // So that JDK version can be used as a discriminator when parsing arguments |
242 | 3416 JDK_Version_init(); |
3417 | |
1864
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6988363: Rebrand vm vendor property settings (jdk7 only)
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|
3418 // Update/Initialize System properties after JDK version number is known |
dfb38ea7da17
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|
3419 Arguments::init_version_specific_system_properties(); |
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|
3420 |
0 | 3421 // Parse arguments |
3422 jint parse_result = Arguments::parse(args); | |
3423 if (parse_result != JNI_OK) return parse_result; | |
3424 | |
12233
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|
3425 os::init_before_ergo(); |
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|
3426 |
40136aa2cdb1
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|
3427 jint ergo_result = Arguments::apply_ergo(); |
40136aa2cdb1
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|
3428 if (ergo_result != JNI_OK) return ergo_result; |
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|
3429 |
0 | 3430 if (PauseAtStartup) { |
3431 os::pause(); | |
3432 } | |
3433 | |
4006 | 3434 HOTSPOT_VM_INIT_BEGIN(); |
0 | 3435 |
3436 // Record VM creation timing statistics | |
3437 TraceVmCreationTime create_vm_timer; | |
3438 create_vm_timer.start(); | |
3439 | |
3440 // Timing (must come after argument parsing) | |
3441 TraceTime timer("Create VM", TraceStartupTime); | |
3442 | |
3443 // Initialize the os module after parsing the args | |
3444 jint os_init_2_result = os::init_2(); | |
3445 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
3446 | |
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|
3447 jint adjust_after_os_result = Arguments::adjust_after_os(); |
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|
3448 if (adjust_after_os_result != JNI_OK) return adjust_after_os_result; |
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|
3449 |
14309 | 3450 // initialize TLS |
6197 | 3451 ThreadLocalStorage::init(); |
3452 | |
3453 // Bootstrap native memory tracking, so it can start recording memory | |
3454 // activities before worker thread is started. This is the first phase | |
3455 // of bootstrapping, VM is currently running in single-thread mode. | |
3456 MemTracker::bootstrap_single_thread(); | |
3457 | |
0 | 3458 // Initialize output stream logging |
3459 ostream_init_log(); | |
3460 | |
3461 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
3462 // Must be before create_vm_init_agents() | |
3463 if (Arguments::init_libraries_at_startup()) { | |
3464 convert_vm_init_libraries_to_agents(); | |
3465 } | |
3466 | |
3467 // Launch -agentlib/-agentpath and converted -Xrun agents | |
3468 if (Arguments::init_agents_at_startup()) { | |
3469 create_vm_init_agents(); | |
3470 } | |
3471 | |
3472 // Initialize Threads state | |
3473 _thread_list = NULL; | |
3474 _number_of_threads = 0; | |
3475 _number_of_non_daemon_threads = 0; | |
3476 | |
3477 // Initialize global data structures and create system classes in heap | |
3478 vm_init_globals(); | |
3479 | |
13796
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|
3480 #ifdef GRAAL |
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|
3481 if (GraalCounterSize > 0) { |
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|
3482 JavaThread::_graal_old_thread_counters = NEW_C_HEAP_ARRAY(jlong, GraalCounterSize, mtInternal); |
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|
3483 memset(JavaThread::_graal_old_thread_counters, 0, sizeof(jlong) * GraalCounterSize); |
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|
3484 } else { |
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|
3485 JavaThread::_graal_old_thread_counters = NULL; |
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|
3486 } |
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|
3487 #endif // GRAAL |
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|
3488 |
0 | 3489 // Attach the main thread to this os thread |
3490 JavaThread* main_thread = new JavaThread(); | |
3491 main_thread->set_thread_state(_thread_in_vm); | |
3492 // must do this before set_active_handles and initialize_thread_local_storage | |
3493 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
3494 // change the stack size recorded here to one based on the java thread | |
3495 // stacksize. This adjusted size is what is used to figure the placement | |
3496 // of the guard pages. | |
3497 main_thread->record_stack_base_and_size(); | |
3498 main_thread->initialize_thread_local_storage(); | |
3499 | |
3500 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
3501 | |
3502 if (!main_thread->set_as_starting_thread()) { | |
3503 vm_shutdown_during_initialization( | |
3504 "Failed necessary internal allocation. Out of swap space"); | |
3505 delete main_thread; | |
3506 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3507 return JNI_ENOMEM; | |
3508 } | |
3509 | |
3510 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
3511 // crash Linux VM, see notes in os_linux.cpp. | |
3512 main_thread->create_stack_guard_pages(); | |
3513 | |
1878 | 3514 // Initialize Java-Level synchronization subsystem |
3515 ObjectMonitor::Initialize() ; | |
0 | 3516 |
6197 | 3517 // Second phase of bootstrapping, VM is about entering multi-thread mode |
3518 MemTracker::bootstrap_multi_thread(); | |
3519 | |
0 | 3520 // Initialize global modules |
3521 jint status = init_globals(); | |
3522 if (status != JNI_OK) { | |
3523 delete main_thread; | |
3524 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3525 return status; | |
3526 } | |
3527 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3528 // Should be done after the heap is fully created |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3529 main_thread->cache_global_variables(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3530 |
0 | 3531 HandleMark hm; |
3532 | |
3533 { MutexLocker mu(Threads_lock); | |
3534 Threads::add(main_thread); | |
3535 } | |
3536 | |
3537 // Any JVMTI raw monitors entered in onload will transition into | |
3538 // real raw monitor. VM is setup enough here for raw monitor enter. | |
3539 JvmtiExport::transition_pending_onload_raw_monitors(); | |
3540 | |
6197 | 3541 // Fully start NMT |
3542 MemTracker::start(); | |
3543 | |
0 | 3544 // Create the VMThread |
3545 { TraceTime timer("Start VMThread", TraceStartupTime); | |
3546 VMThread::create(); | |
3547 Thread* vmthread = VMThread::vm_thread(); | |
3548 | |
3549 if (!os::create_thread(vmthread, os::vm_thread)) | |
3550 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
3551 | |
3552 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
3553 // Monitors can have spurious returns, must always check another state flag | |
3554 { | |
3555 MutexLocker ml(Notify_lock); | |
3556 os::start_thread(vmthread); | |
3557 while (vmthread->active_handles() == NULL) { | |
3558 Notify_lock->wait(); | |
3559 } | |
3560 } | |
3561 } | |
3562 | |
3563 assert (Universe::is_fully_initialized(), "not initialized"); | |
9071
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8855
diff
changeset
|
3564 if (VerifyDuringStartup) { |
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
9071
diff
changeset
|
3565 // Make sure we're starting with a clean slate. |
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
9071
diff
changeset
|
3566 VM_Verify verify_op; |
9071
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8855
diff
changeset
|
3567 VMThread::execute(&verify_op); |
8855
24ef5fb05e0f
8010463: G1: Crashes with -UseTLAB and heap verification
johnc
parents:
8793
diff
changeset
|
3568 } |
24ef5fb05e0f
8010463: G1: Crashes with -UseTLAB and heap verification
johnc
parents:
8793
diff
changeset
|
3569 |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3570 Thread* THREAD = Thread::current(); |
0 | 3571 |
3572 // At this point, the Universe is initialized, but we have not executed | |
3573 // any byte code. Now is a good time (the only time) to dump out the | |
3574 // internal state of the JVM for sharing. | |
3575 if (DumpSharedSpaces) { | |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3576 MetaspaceShared::preload_and_dump(CHECK_JNI_ERR); |
0 | 3577 ShouldNotReachHere(); |
3578 } | |
3579 | |
3580 // Always call even when there are not JVMTI environments yet, since environments | |
3581 // may be attached late and JVMTI must track phases of VM execution | |
3582 JvmtiExport::enter_start_phase(); | |
3583 | |
3584 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
3585 JvmtiExport::post_vm_start(); | |
3586 | |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3587 initialize_java_lang_classes(main_thread, CHECK_JNI_ERR); |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3588 |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3589 // We need this for ClassDataSharing - the initial vm.info property is set |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3590 // with the default value of CDS "sharing" which may be reset through |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3591 // command line options. |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3592 reset_vm_info_property(CHECK_JNI_ERR); |
0 | 3593 |
3594 quicken_jni_functions(); | |
3595 | |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3596 // Must be run after init_ft which initializes ft_enabled |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3597 if (TRACE_INITIALIZE() != JNI_OK) { |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3598 vm_exit_during_initialization("Failed to initialize tracing backend"); |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3599 } |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3600 |
0 | 3601 // Set flag that basic initialization has completed. Used by exceptions and various |
3602 // debug stuff, that does not work until all basic classes have been initialized. | |
3603 set_init_completed(); | |
3604 | |
4006 | 3605 HOTSPOT_VM_INIT_END(); |
0 | 3606 |
3607 // record VM initialization completion time | |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3608 #if INCLUDE_MANAGEMENT |
0 | 3609 Management::record_vm_init_completed(); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3610 #endif // INCLUDE_MANAGEMENT |
0 | 3611 |
3612 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3613 // valid exceptions may be thrown in the process. | |
3614 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3615 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3616 // anymore. We call vm_exit_during_initialization directly instead. | |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3617 SystemDictionary::compute_java_system_loader(CHECK_JNI_ERR); |
0 | 3618 |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3619 #if INCLUDE_ALL_GCS |
0 | 3620 // Support for ConcurrentMarkSweep. This should be cleaned up |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3621 // 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
|
3622 // once things are properly refactored. XXX YSR |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3623 if (UseConcMarkSweepGC || UseG1GC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3624 if (UseConcMarkSweepGC) { |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3625 ConcurrentMarkSweepThread::makeSurrogateLockerThread(CHECK_JNI_ERR); |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3626 } else { |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3627 ConcurrentMarkThread::makeSurrogateLockerThread(CHECK_JNI_ERR); |
0 | 3628 } |
3629 } | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3630 #endif // INCLUDE_ALL_GCS |
0 | 3631 |
3632 // Always call even when there are not JVMTI environments yet, since environments | |
3633 // may be attached late and JVMTI must track phases of VM execution | |
3634 JvmtiExport::enter_live_phase(); | |
3635 | |
3636 // Signal Dispatcher needs to be started before VMInit event is posted | |
3637 os::signal_init(); | |
3638 | |
3639 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3640 if (!DisableAttachMechanism) { | |
11139
2e8f19c2feef
7162400: Intermittent java.io.IOException: Bad file number during HotSpotVirtualMachine.executeCommand
allwin
parents:
11136
diff
changeset
|
3641 AttachListener::vm_start(); |
0 | 3642 if (StartAttachListener || AttachListener::init_at_startup()) { |
3643 AttachListener::init(); | |
3644 } | |
3645 } | |
3646 | |
3647 // Launch -Xrun agents | |
3648 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3649 // back-end can launch with -Xdebug -Xrunjdwp. | |
3650 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3651 create_vm_init_libraries(); | |
3652 } | |
3653 | |
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3654 // 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
|
3655 JvmtiExport::post_vm_initialized(); |
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3656 |
10405 | 3657 if (TRACE_START() != JNI_OK) { |
3658 vm_exit_during_initialization("Failed to start tracing backend."); | |
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3659 } |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3660 |
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3661 if (CleanChunkPoolAsync) { |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3662 Chunk::start_chunk_pool_cleaner_task(); |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3663 } |
0 | 3664 |
3665 // initialize compiler(s) | |
14124
7ad529321294
make: remove GRAALVM and introduce COMPILERGRAAL. fix client hosted-mode
Bernhard Urban <bernhard.urban@jku.at>
parents:
13819
diff
changeset
|
3666 #if defined(COMPILER1) || defined(COMPILER2) || defined(SHARK) || defined(COMPILERGRAAL) |
0 | 3667 CompileBroker::compilation_init(); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3668 #endif |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3669 |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3670 // Pre-initialize some JSR292 core classes to avoid deadlock during class loading. |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3671 // It is done after compilers are initialized, because otherwise compilations of |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3672 // signature polymorphic MH intrinsics can be missed |
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3673 // (see SystemDictionary::find_method_handle_intrinsic). |
12163
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3674 if (EnableInvokeDynamic) { |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3675 initialize_jsr292_core_classes(CHECK_JNI_ERR); |
12163
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3676 } |
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3677 |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3678 #if INCLUDE_MANAGEMENT |
0 | 3679 Management::initialize(THREAD); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3680 |
0 | 3681 if (HAS_PENDING_EXCEPTION) { |
3682 // management agent fails to start possibly due to | |
3683 // configuration problem and is responsible for printing | |
3684 // stack trace if appropriate. Simply exit VM. | |
3685 vm_exit(1); | |
3686 } | |
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3687 #endif // INCLUDE_MANAGEMENT |
0 | 3688 |
3689 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3690 if (MemProfiling) MemProfiler::engage(); | |
3691 StatSampler::engage(); | |
3692 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3693 | |
3694 BiasedLocking::init(); | |
3695 | |
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3696 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
|
3697 call_postVMInitHook(THREAD); |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3698 // 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
|
3699 // exceptions and provide means of diagnosis. |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3700 if (HAS_PENDING_EXCEPTION) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3701 CLEAR_PENDING_EXCEPTION; |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3702 } |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3703 } |
0 | 3704 |
6939
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3705 { |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3706 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
|
3707 // 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
|
3708 // or by dynamic enrollment. |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3709 WatcherThread::make_startable(); |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3710 // 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
|
3711 // 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
|
3712 // 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
|
3713 // 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
|
3714 if (PeriodicTask::num_tasks() > 0) { |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3715 WatcherThread::start(); |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3716 } |
0 | 3717 } |
3718 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3719 // Give os specific code one last chance to start |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3720 os::init_3(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3721 |
0 | 3722 create_vm_timer.end(); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3723 #ifdef ASSERT |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3724 _vm_complete = true; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3725 #endif |
0 | 3726 return JNI_OK; |
3727 } | |
3728 | |
3729 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3730 extern "C" { | |
3731 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3732 } | |
3733 // Find a command line agent library and return its entry point for | |
3734 // -agentlib: -agentpath: -Xrun | |
3735 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3736 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3737 OnLoadEntry_t on_load_entry = NULL; | |
12117
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3738 void *library = NULL; |
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3739 |
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3740 if (!agent->valid()) { |
0 | 3741 char buffer[JVM_MAXPATHLEN]; |
3742 char ebuf[1024]; | |
3743 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
|
3744 const char *msg = "Could not find agent library "; |
0 | 3745 |
12220 | 3746 // First check to see if agent is statically linked into executable |
12117
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3747 if (os::find_builtin_agent(agent, on_load_symbols, num_symbol_entries)) { |
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3748 library = agent->os_lib(); |
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3749 } else if (agent->is_absolute_path()) { |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3750 library = os::dll_load(name, ebuf, sizeof ebuf); |
0 | 3751 if (library == NULL) { |
1694
ab3fd720516c
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3752 const char *sub_msg = " in absolute path, with error: "; |
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3753 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3754 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
1694
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3755 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3756 // If we can't find the agent, exit. |
1694
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3757 vm_exit_during_initialization(buf, NULL); |
6197 | 3758 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3759 } |
3760 } else { | |
3761 // Try to load the agent from the standard dll directory | |
6966
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3762 if (os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
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|
3763 name)) { |
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3764 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
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3765 } |
0 | 3766 if (library == NULL) { // Try the local directory |
3767 char ns[1] = {0}; | |
6966
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3768 if (os::dll_build_name(buffer, sizeof(buffer), ns, name)) { |
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3769 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
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3770 } |
0 | 3771 if (library == NULL) { |
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3772 const char *sub_msg = " on the library path, with error: "; |
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|
3773 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3774 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
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|
3775 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3776 // If we can't find the agent, exit. |
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|
3777 vm_exit_during_initialization(buf, NULL); |
6197 | 3778 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3779 } |
3780 } | |
3781 } | |
3782 agent->set_os_lib(library); | |
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3783 agent->set_valid(); |
0 | 3784 } |
3785 | |
3786 // Find the OnLoad function. | |
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|
3787 on_load_entry = |
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3788 CAST_TO_FN_PTR(OnLoadEntry_t, os::find_agent_function(agent, |
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|
3789 false, |
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|
3790 on_load_symbols, |
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|
3791 num_symbol_entries)); |
0 | 3792 return on_load_entry; |
3793 } | |
3794 | |
3795 // Find the JVM_OnLoad entry point | |
3796 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3797 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3798 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3799 } | |
3800 | |
3801 // Find the Agent_OnLoad entry point | |
3802 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3803 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3804 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3805 } | |
3806 | |
3807 // For backwards compatibility with -Xrun | |
3808 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3809 // treated like -agentpath: | |
3810 // Must be called before agent libraries are created | |
3811 void Threads::convert_vm_init_libraries_to_agents() { | |
3812 AgentLibrary* agent; | |
3813 AgentLibrary* next; | |
3814 | |
3815 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3816 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3817 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3818 | |
3819 // If there is an JVM_OnLoad function it will get called later, | |
3820 // otherwise see if there is an Agent_OnLoad | |
3821 if (on_load_entry == NULL) { | |
3822 on_load_entry = lookup_agent_on_load(agent); | |
3823 if (on_load_entry != NULL) { | |
3824 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3825 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3826 Arguments::convert_library_to_agent(agent); | |
3827 } else { | |
3828 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3829 } | |
3830 } | |
3831 } | |
3832 } | |
3833 | |
3834 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3835 // Invokes Agent_OnLoad | |
3836 // Called very early -- before JavaThreads exist | |
3837 void Threads::create_vm_init_agents() { | |
3838 extern struct JavaVM_ main_vm; | |
3839 AgentLibrary* agent; | |
3840 | |
3841 JvmtiExport::enter_onload_phase(); | |
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3842 |
0 | 3843 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { |
3844 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3845 | |
3846 if (on_load_entry != NULL) { | |
3847 // Invoke the Agent_OnLoad function | |
3848 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3849 if (err != JNI_OK) { | |
3850 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3851 } | |
3852 } else { | |
3853 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3854 } | |
3855 } | |
3856 JvmtiExport::enter_primordial_phase(); | |
3857 } | |
3858 | |
3859 extern "C" { | |
3860 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3861 } | |
3862 | |
3863 void Threads::shutdown_vm_agents() { | |
3864 // Send any Agent_OnUnload notifications | |
3865 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
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3866 size_t num_symbol_entries = ARRAY_SIZE(on_unload_symbols); |
0 | 3867 extern struct JavaVM_ main_vm; |
3868 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3869 | |
3870 // Find the Agent_OnUnload function. | |
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3871 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, |
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|
3872 os::find_agent_function(agent, |
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|
3873 false, |
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|
3874 on_unload_symbols, |
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|
3875 num_symbol_entries)); |
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|
3876 |
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|
3877 // Invoke the Agent_OnUnload function |
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|
3878 if (unload_entry != NULL) { |
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|
3879 JavaThread* thread = JavaThread::current(); |
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|
3880 ThreadToNativeFromVM ttn(thread); |
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|
3881 HandleMark hm(thread); |
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|
3882 (*unload_entry)(&main_vm); |
0 | 3883 } |
3884 } | |
3885 } | |
3886 | |
3887 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3888 // Invokes JVM_OnLoad | |
3889 void Threads::create_vm_init_libraries() { | |
3890 extern struct JavaVM_ main_vm; | |
3891 AgentLibrary* agent; | |
3892 | |
3893 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3894 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3895 | |
3896 if (on_load_entry != NULL) { | |
3897 // Invoke the JVM_OnLoad function | |
3898 JavaThread* thread = JavaThread::current(); | |
3899 ThreadToNativeFromVM ttn(thread); | |
3900 HandleMark hm(thread); | |
3901 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3902 if (err != JNI_OK) { | |
3903 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3904 } | |
3905 } else { | |
3906 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3907 } | |
3908 } | |
3909 } | |
3910 | |
3911 // Last thread running calls java.lang.Shutdown.shutdown() | |
3912 void JavaThread::invoke_shutdown_hooks() { | |
3913 HandleMark hm(this); | |
3914 | |
3915 // We could get here with a pending exception, if so clear it now. | |
3916 if (this->has_pending_exception()) { | |
3917 this->clear_pending_exception(); | |
3918 } | |
3919 | |
3920 EXCEPTION_MARK; | |
6725
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3921 Klass* k = |
2177
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3922 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
0 | 3923 THREAD); |
3924 if (k != NULL) { | |
3925 // SystemDictionary::resolve_or_null will return null if there was | |
3926 // an exception. If we cannot load the Shutdown class, just don't | |
3927 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3928 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3929 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3930 // was called, the Shutdown class would have already been loaded | |
3931 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3932 instanceKlassHandle shutdown_klass (THREAD, k); | |
3933 JavaValue result(T_VOID); | |
3934 JavaCalls::call_static(&result, | |
3935 shutdown_klass, | |
2177
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|
3936 vmSymbols::shutdown_method_name(), |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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diff
changeset
|
3937 vmSymbols::void_method_signature(), |
0 | 3938 THREAD); |
3939 } | |
3940 CLEAR_PENDING_EXCEPTION; | |
3941 } | |
3942 | |
3943 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3944 // the program falls off the end of main(). Another VM exit path is through | |
3945 // vm_exit() when the program calls System.exit() to return a value or when | |
3946 // there is a serious error in VM. The two shutdown paths are not exactly | |
3947 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3948 // and VM_Exit op at VM level. | |
3949 // | |
3950 // Shutdown sequence: | |
6197 | 3951 // + Shutdown native memory tracking if it is on |
0 | 3952 // + Wait until we are the last non-daemon thread to execute |
3953 // <-- every thing is still working at this moment --> | |
3954 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3955 // shutdown hooks, run finalizers if finalization-on-exit | |
3956 // + Call before_exit(), prepare for VM exit | |
3957 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3958 // currently the only user of this mechanism is File.deleteOnExit()) | |
3959 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3960 // post thread end and vm death events to JVMTI, | |
3961 // stop signal thread | |
3962 // + Call JavaThread::exit(), it will: | |
3963 // > release JNI handle blocks, remove stack guard pages | |
3964 // > remove this thread from Threads list | |
3965 // <-- no more Java code from this thread after this point --> | |
3966 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3967 // the compiler threads at safepoint | |
3968 // <-- do not use anything that could get blocked by Safepoint --> | |
3969 // + Disable tracing at JNI/JVM barriers | |
3970 // + Set _vm_exited flag for threads that are still running native code | |
3971 // + Delete this thread | |
3972 // + Call exit_globals() | |
3973 // > deletes tty | |
3974 // > deletes PerfMemory resources | |
3975 // + Return to caller | |
3976 | |
3977 bool Threads::destroy_vm() { | |
3978 JavaThread* thread = JavaThread::current(); | |
3979 | |
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3980 #ifdef ASSERT |
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3981 _vm_complete = false; |
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3982 #endif |
0 | 3983 // Wait until we are the last non-daemon thread to execute |
3984 { MutexLocker nu(Threads_lock); | |
3985 while (Threads::number_of_non_daemon_threads() > 1 ) | |
3986 // This wait should make safepoint checks, wait without a timeout, | |
3987 // and wait as a suspend-equivalent condition. | |
3988 // | |
3989 // Note: If the FlatProfiler is running and this thread is waiting | |
3990 // for another non-daemon thread to finish, then the FlatProfiler | |
3991 // is waiting for the external suspend request on this thread to | |
3992 // complete. wait_for_ext_suspend_completion() will eventually | |
3993 // timeout, but that takes time. Making this wait a suspend- | |
3994 // equivalent condition solves that timeout problem. | |
3995 // | |
3996 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
3997 Mutex::_as_suspend_equivalent_flag); | |
3998 } | |
3999 | |
4000 // Hang forever on exit if we are reporting an error. | |
4001 if (ShowMessageBoxOnError && is_error_reported()) { | |
4002 os::infinite_sleep(); | |
4003 } | |
2302
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7022037: Pause when exiting if debugger is attached on windows
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|
4004 os::wait_for_keypress_at_exit(); |
0 | 4005 |
4006 if (JDK_Version::is_jdk12x_version()) { | |
4007 // We are the last thread running, so check if finalizers should be run. | |
4008 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
4009 HandleMark rm(thread); | |
4010 Universe::run_finalizers_on_exit(); | |
4011 } else { | |
4012 // run Java level shutdown hooks | |
4013 thread->invoke_shutdown_hooks(); | |
4014 } | |
4015 | |
4016 before_exit(thread); | |
4017 | |
4018 thread->exit(true); | |
4019 | |
4020 // Stop VM thread. | |
4021 { | |
4022 // 4945125 The vm thread comes to a safepoint during exit. | |
4023 // GC vm_operations can get caught at the safepoint, and the | |
4024 // heap is unparseable if they are caught. Grab the Heap_lock | |
4025 // to prevent this. The GC vm_operations will not be able to | |
4026 // queue until after the vm thread is dead. | |
3769
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7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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4027 // After this point, we'll never emerge out of the safepoint before |
ef2d1b8f2dd4
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|
4028 // the VM exits, so concurrent GC threads do not need to be explicitly |
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|
4029 // stopped; they remain inactive until the process exits. |
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|
4030 // Note: some concurrent G1 threads may be running during a safepoint, |
ef2d1b8f2dd4
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|
4031 // but these will not be accessing the heap, just some G1-specific side |
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|
4032 // data structures that are not accessed by any other threads but them |
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|
4033 // after this point in a terminal safepoint. |
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|
4034 |
0 | 4035 MutexLocker ml(Heap_lock); |
4036 | |
4037 VMThread::wait_for_vm_thread_exit(); | |
4038 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
4039 VMThread::destroy(); | |
4040 } | |
4041 | |
4042 // clean up ideal graph printers | |
4043 #if defined(COMPILER2) && !defined(PRODUCT) | |
4044 IdealGraphPrinter::clean_up(); | |
4045 #endif | |
4046 | |
4047 // Now, all Java threads are gone except daemon threads. Daemon threads | |
4048 // running Java code or in VM are stopped by the Safepoint. However, | |
4049 // daemon threads executing native code are still running. But they | |
4050 // will be stopped at native=>Java/VM barriers. Note that we can't | |
4051 // simply kill or suspend them, as it is inherently deadlock-prone. | |
4052 | |
4053 #ifndef PRODUCT | |
4054 // disable function tracing at JNI/JVM barriers | |
4055 TraceJNICalls = false; | |
4056 TraceJVMCalls = false; | |
4057 TraceRuntimeCalls = false; | |
4058 #endif | |
4059 | |
4060 VM_Exit::set_vm_exited(); | |
4061 | |
4062 notify_vm_shutdown(); | |
4063 | |
4064 delete thread; | |
4065 | |
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|
4066 #ifdef GRAAL |
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4067 if (GraalCounterSize > 0) { |
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|
4068 FREE_C_HEAP_ARRAY(jlong, JavaThread::_graal_old_thread_counters, mtInternal); |
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4069 } |
8cd953e97e2d
rework of benchmark counters: fix size at VM entry, not at build time
Lukas Stadler <lukas.stadler@jku.at>
parents:
13739
diff
changeset
|
4070 #endif // GRAAL |
8cd953e97e2d
rework of benchmark counters: fix size at VM entry, not at build time
Lukas Stadler <lukas.stadler@jku.at>
parents:
13739
diff
changeset
|
4071 |
0 | 4072 // exit_globals() will delete tty |
4073 exit_globals(); | |
4074 | |
4075 return true; | |
4076 } | |
4077 | |
4078 | |
4079 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
4080 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
4081 return is_supported_jni_version(version); | |
4082 } | |
4083 | |
4084 | |
4085 jboolean Threads::is_supported_jni_version(jint version) { | |
4086 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
4087 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
4088 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
8793
499ccc15bbc8
8005716: Enhance JNI specification to allow support of static JNI libraries in Embedded JREs
bpittore
parents:
8673
diff
changeset
|
4089 if (version == JNI_VERSION_1_8) return JNI_TRUE; |
0 | 4090 return JNI_FALSE; |
4091 } | |
4092 | |
4093 | |
4094 void Threads::add(JavaThread* p, bool force_daemon) { | |
4095 // The threads lock must be owned at this point | |
4096 assert_locked_or_safepoint(Threads_lock); | |
1842
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
tonyp
parents:
1838
diff
changeset
|
4097 |
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
tonyp
parents:
1838
diff
changeset
|
4098 // See the comment for this method in thread.hpp for its purpose and |
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
tonyp
parents:
1838
diff
changeset
|
4099 // why it is called here. |
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
tonyp
parents:
1838
diff
changeset
|
4100 p->initialize_queues(); |
0 | 4101 p->set_next(_thread_list); |
4102 _thread_list = p; | |
4103 _number_of_threads++; | |
4104 oop threadObj = p->threadObj(); | |
4105 bool daemon = true; | |
4106 // Bootstrapping problem: threadObj can be null for initial | |
4107 // JavaThread (or for threads attached via JNI) | |
4108 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
4109 _number_of_non_daemon_threads++; | |
4110 daemon = false; | |
4111 } | |
4112 | |
6197 | 4113 p->set_safepoint_visible(true); |
4114 | |
0 | 4115 ThreadService::add_thread(p, daemon); |
4116 | |
4117 // Possible GC point. | |
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4800
diff
changeset
|
4118 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
0 | 4119 } |
4120 | |
4121 void Threads::remove(JavaThread* p) { | |
4122 // Extra scope needed for Thread_lock, so we can check | |
4123 // that we do not remove thread without safepoint code notice | |
4124 { MutexLocker ml(Threads_lock); | |
4125 | |
4126 assert(includes(p), "p must be present"); | |
4127 | |
4128 JavaThread* current = _thread_list; | |
4129 JavaThread* prev = NULL; | |
4130 | |
4131 while (current != p) { | |
4132 prev = current; | |
4133 current = current->next(); | |
4134 } | |
4135 | |
4136 if (prev) { | |
4137 prev->set_next(current->next()); | |
4138 } else { | |
4139 _thread_list = p->next(); | |
4140 } | |
4141 _number_of_threads--; | |
4142 oop threadObj = p->threadObj(); | |
4143 bool daemon = true; | |
4144 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
4145 _number_of_non_daemon_threads--; | |
4146 daemon = false; | |
4147 | |
4148 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
4149 // on destroy_vm will wake up. | |
4150 if (number_of_non_daemon_threads() == 1) | |
4151 Threads_lock->notify_all(); | |
4152 } | |
4153 ThreadService::remove_thread(p, daemon); | |
4154 | |
4155 // Make sure that safepoint code disregard this thread. This is needed since | |
4156 // the thread might mess around with locks after this point. This can cause it | |
4157 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
4158 // of this thread since it is removed from the queue. | |
4159 p->set_terminated_value(); | |
6197 | 4160 |
4161 // Now, this thread is not visible to safepoint | |
4162 p->set_safepoint_visible(false); | |
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6872
diff
changeset
|
4163 // once the thread becomes safepoint invisible, we can not use its per-thread |
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6872
diff
changeset
|
4164 // recorder. And Threads::do_threads() no longer walks this thread, so we have |
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6872
diff
changeset
|
4165 // to release its per-thread recorder here. |
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6872
diff
changeset
|
4166 MemTracker::thread_exiting(p); |
0 | 4167 } // unlock Threads_lock |
4168 | |
4169 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4800
diff
changeset
|
4170 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
0 | 4171 } |
4172 | |
4173 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
4174 bool Threads::includes(JavaThread* p) { | |
4175 assert(Threads_lock->is_locked(), "sanity check"); | |
4176 ALL_JAVA_THREADS(q) { | |
4177 if (q == p ) { | |
4178 return true; | |
4179 } | |
4180 } | |
4181 return false; | |
4182 } | |
4183 | |
4184 // Operations on the Threads list for GC. These are not explicitly locked, | |
4185 // but the garbage collector must provide a safe context for them to run. | |
4186 // In particular, these things should never be called when the Threads_lock | |
4187 // is held by some other thread. (Note: the Safepoint abstraction also | |
14309 | 4188 // uses the Threads_lock to guarantee this property. It also makes sure that |
0 | 4189 // all threads gets blocked when exiting or starting). |
4190 | |
14483
be0ac0e8f6e7
8035393: Use CLDClosure instead of CLDToOopClosure in frame::oops_interpreted_do
stefank
parents:
14314
diff
changeset
|
4191 void Threads::oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf) { |
0 | 4192 ALL_JAVA_THREADS(p) { |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
4193 p->oops_do(f, cld_f, cf); |
0 | 4194 } |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
4195 VMThread::vm_thread()->oops_do(f, cld_f, cf); |
0 | 4196 } |
4197 | |
14483
be0ac0e8f6e7
8035393: Use CLDClosure instead of CLDToOopClosure in frame::oops_interpreted_do
stefank
parents:
14314
diff
changeset
|
4198 void Threads::possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf) { |
0 | 4199 // Introduce a mechanism allowing parallel threads to claim threads as |
4200 // root groups. Overhead should be small enough to use all the time, | |
4201 // even in sequential code. | |
4202 SharedHeap* sh = SharedHeap::heap(); | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4203 // Cannot yet substitute active_workers for n_par_threads |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4204 // because of G1CollectedHeap::verify() use of |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4205 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4206 // turn off parallelism in process_strong_roots while active_workers |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4207 // is being used for parallelism elsewhere. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4208 bool is_par = sh->n_par_threads() > 0; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4209 assert(!is_par || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4210 (SharedHeap::heap()->n_par_threads() == |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4211 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
0 | 4212 int cp = SharedHeap::heap()->strong_roots_parity(); |
4213 ALL_JAVA_THREADS(p) { | |
4214 if (p->claim_oops_do(is_par, cp)) { | |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
4215 p->oops_do(f, cld_f, cf); |
0 | 4216 } |
4217 } | |
4218 VMThread* vmt = VMThread::vm_thread(); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3938
diff
changeset
|
4219 if (vmt->claim_oops_do(is_par, cp)) { |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
4220 vmt->oops_do(f, cld_f, cf); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3938
diff
changeset
|
4221 } |
0 | 4222 } |
4223 | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4224 #if INCLUDE_ALL_GCS |
0 | 4225 // Used by ParallelScavenge |
4226 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
4227 ALL_JAVA_THREADS(p) { | |
4228 q->enqueue(new ThreadRootsTask(p)); | |
4229 } | |
4230 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
4231 } | |
4232 | |
4233 // Used by Parallel Old | |
4234 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
4235 ALL_JAVA_THREADS(p) { | |
4236 q->enqueue(new ThreadRootsMarkingTask(p)); | |
4237 } | |
4238 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
4239 } | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4240 #endif // INCLUDE_ALL_GCS |
0 | 4241 |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4242 void Threads::nmethods_do(CodeBlobClosure* cf) { |
0 | 4243 ALL_JAVA_THREADS(p) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4244 p->nmethods_do(cf); |
0 | 4245 } |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4246 VMThread::vm_thread()->nmethods_do(cf); |
0 | 4247 } |
4248 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4249 void Threads::metadata_do(void f(Metadata*)) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4250 ALL_JAVA_THREADS(p) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4251 p->metadata_do(f); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4252 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4253 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4254 |
0 | 4255 void Threads::gc_epilogue() { |
4256 ALL_JAVA_THREADS(p) { | |
4257 p->gc_epilogue(); | |
4258 } | |
4259 } | |
4260 | |
4261 void Threads::gc_prologue() { | |
4262 ALL_JAVA_THREADS(p) { | |
4263 p->gc_prologue(); | |
4264 } | |
4265 } | |
4266 | |
4267 void Threads::deoptimized_wrt_marked_nmethods() { | |
4268 ALL_JAVA_THREADS(p) { | |
4269 p->deoptimized_wrt_marked_nmethods(); | |
4270 } | |
4271 } | |
4272 | |
4273 | |
4274 // Get count Java threads that are waiting to enter the specified monitor. | |
4275 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
4276 address monitor, bool doLock) { | |
4277 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
4278 "must grab Threads_lock or be at safepoint"); | |
4279 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
4280 | |
4281 int i = 0; | |
4282 { | |
4283 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4284 ALL_JAVA_THREADS(p) { | |
4285 if (p->is_Compiler_thread()) continue; | |
4286 | |
4287 address pending = (address)p->current_pending_monitor(); | |
4288 if (pending == monitor) { // found a match | |
4289 if (i < count) result->append(p); // save the first count matches | |
4290 i++; | |
4291 } | |
4292 } | |
4293 } | |
4294 return result; | |
4295 } | |
4296 | |
4297 | |
4298 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
4299 assert(doLock || | |
4300 Threads_lock->owned_by_self() || | |
4301 SafepointSynchronize::is_at_safepoint(), | |
4302 "must grab Threads_lock or be at safepoint"); | |
4303 | |
4304 // NULL owner means not locked so we can skip the search | |
4305 if (owner == NULL) return NULL; | |
4306 | |
4307 { | |
4308 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4309 ALL_JAVA_THREADS(p) { | |
4310 // first, see if owner is the address of a Java thread | |
4311 if (owner == (address)p) return p; | |
4312 } | |
4313 } | |
8673
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4314 // Cannot assert on lack of success here since this function may be |
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4315 // used by code that is trying to report useful problem information |
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4316 // like deadlock detection. |
0 | 4317 if (UseHeavyMonitors) return NULL; |
4318 | |
4319 // | |
4320 // If we didn't find a matching Java thread and we didn't force use of | |
4321 // heavyweight monitors, then the owner is the stack address of the | |
4322 // Lock Word in the owning Java thread's stack. | |
4323 // | |
4324 JavaThread* the_owner = NULL; | |
4325 { | |
4326 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4327 ALL_JAVA_THREADS(q) { | |
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4328 if (q->is_lock_owned(owner)) { |
0 | 4329 the_owner = q; |
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4330 break; |
0 | 4331 } |
4332 } | |
4333 } | |
8673
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4334 // cannot assert on lack of success here; see above comment |
0 | 4335 return the_owner; |
4336 } | |
4337 | |
4338 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
4339 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
4340 char buf[32]; | |
4341 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
4342 | |
4343 st->print_cr("Full thread dump %s (%s %s):", | |
4344 Abstract_VM_Version::vm_name(), | |
4345 Abstract_VM_Version::vm_release(), | |
4346 Abstract_VM_Version::vm_info_string() | |
4347 ); | |
4348 st->cr(); | |
4349 | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4350 #if INCLUDE_ALL_GCS |
0 | 4351 // Dump concurrent locks |
4352 ConcurrentLocksDump concurrent_locks; | |
4353 if (print_concurrent_locks) { | |
4354 concurrent_locks.dump_at_safepoint(); | |
4355 } | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4356 #endif // INCLUDE_ALL_GCS |
0 | 4357 |
4358 ALL_JAVA_THREADS(p) { | |
4359 ResourceMark rm; | |
4360 p->print_on(st); | |
4361 if (print_stacks) { | |
4362 if (internal_format) { | |
4363 p->trace_stack(); | |
4364 } else { | |
4365 p->print_stack_on(st); | |
4366 } | |
4367 } | |
4368 st->cr(); | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4369 #if INCLUDE_ALL_GCS |
0 | 4370 if (print_concurrent_locks) { |
4371 concurrent_locks.print_locks_on(p, st); | |
4372 } | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4373 #endif // INCLUDE_ALL_GCS |
0 | 4374 } |
4375 | |
4376 VMThread::vm_thread()->print_on(st); | |
4377 st->cr(); | |
4378 Universe::heap()->print_gc_threads_on(st); | |
4379 WatcherThread* wt = WatcherThread::watcher_thread(); | |
6766 | 4380 if (wt != NULL) { |
4381 wt->print_on(st); | |
4382 st->cr(); | |
4383 } | |
0 | 4384 CompileBroker::print_compiler_threads_on(st); |
4385 st->flush(); | |
4386 } | |
4387 | |
4388 // Threads::print_on_error() is called by fatal error handler. It's possible | |
4389 // that VM is not at safepoint and/or current thread is inside signal handler. | |
4390 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
4391 // memory (even in resource area), it might deadlock the error handler. | |
4392 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
4393 bool found_current = false; | |
4394 st->print_cr("Java Threads: ( => current thread )"); | |
4395 ALL_JAVA_THREADS(thread) { | |
4396 bool is_current = (current == thread); | |
4397 found_current = found_current || is_current; | |
4398 | |
4399 st->print("%s", is_current ? "=>" : " "); | |
4400 | |
4401 st->print(PTR_FORMAT, thread); | |
4402 st->print(" "); | |
4403 thread->print_on_error(st, buf, buflen); | |
4404 st->cr(); | |
4405 } | |
4406 st->cr(); | |
4407 | |
4408 st->print_cr("Other Threads:"); | |
4409 if (VMThread::vm_thread()) { | |
4410 bool is_current = (current == VMThread::vm_thread()); | |
4411 found_current = found_current || is_current; | |
4412 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
4413 | |
4414 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
4415 st->print(" "); | |
4416 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
4417 st->cr(); | |
4418 } | |
4419 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4420 if (wt != NULL) { | |
4421 bool is_current = (current == wt); | |
4422 found_current = found_current || is_current; | |
4423 st->print("%s", is_current ? "=>" : " "); | |
4424 | |
4425 st->print(PTR_FORMAT, wt); | |
4426 st->print(" "); | |
4427 wt->print_on_error(st, buf, buflen); | |
4428 st->cr(); | |
4429 } | |
4430 if (!found_current) { | |
4431 st->cr(); | |
4432 st->print("=>" PTR_FORMAT " (exited) ", current); | |
4433 current->print_on_error(st, buf, buflen); | |
4434 st->cr(); | |
4435 } | |
4436 } | |
4437 | |
1878 | 4438 // Internal SpinLock and Mutex |
4439 // Based on ParkEvent | |
4440 | |
4441 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
0 | 4442 // |
1878 | 4443 // We employ SpinLocks _only for low-contention, fixed-length |
4444 // short-duration critical sections where we're concerned | |
4445 // about native mutex_t or HotSpot Mutex:: latency. | |
4446 // The mux construct provides a spin-then-block mutual exclusion | |
4447 // mechanism. | |
4448 // | |
4449 // Testing has shown that contention on the ListLock guarding gFreeList | |
4450 // is common. If we implement ListLock as a simple SpinLock it's common | |
4451 // for the JVM to devolve to yielding with little progress. This is true | |
4452 // despite the fact that the critical sections protected by ListLock are | |
4453 // extremely short. | |
0 | 4454 // |
1878 | 4455 // TODO-FIXME: ListLock should be of type SpinLock. |
4456 // We should make this a 1st-class type, integrated into the lock | |
4457 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
4458 // should have sufficient padding to avoid false-sharing and excessive | |
4459 // cache-coherency traffic. | |
4460 | |
4461 | |
4462 typedef volatile int SpinLockT ; | |
4463 | |
4464 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
4465 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
4466 return ; // normal fast-path return | |
4467 } | |
4468 | |
4469 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
4470 TEVENT (SpinAcquire - ctx) ; | |
4471 int ctr = 0 ; | |
4472 int Yields = 0 ; | |
0 | 4473 for (;;) { |
1878 | 4474 while (*adr != 0) { |
4475 ++ctr ; | |
4476 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
4477 if (Yields > 5) { | |
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|
4478 os::naked_short_sleep(1); |
1878 | 4479 } else { |
4480 os::NakedYield() ; | |
4481 ++Yields ; | |
4482 } | |
4483 } else { | |
4484 SpinPause() ; | |
0 | 4485 } |
1878 | 4486 } |
4487 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
0 | 4488 } |
4489 } | |
4490 | |
1878 | 4491 void Thread::SpinRelease (volatile int * adr) { |
4492 assert (*adr != 0, "invariant") ; | |
4493 OrderAccess::fence() ; // guarantee at least release consistency. | |
4494 // Roach-motel semantics. | |
4495 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
4496 // but prior LDs and STs within the critical section can't be allowed | |
4497 // to reorder or float past the ST that releases the lock. | |
4498 *adr = 0 ; | |
0 | 4499 } |
4500 | |
1878 | 4501 // muxAcquire and muxRelease: |
4502 // | |
4503 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
4504 // The LSB of the word is set IFF the lock is held. | |
4505 // The remainder of the word points to the head of a singly-linked list | |
4506 // of threads blocked on the lock. | |
4507 // | |
4508 // * The current implementation of muxAcquire-muxRelease uses its own | |
4509 // dedicated Thread._MuxEvent instance. If we're interested in | |
4510 // minimizing the peak number of extant ParkEvent instances then | |
4511 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
4512 // as certain invariants were satisfied. Specifically, care would need | |
4513 // to be taken with regards to consuming unpark() "permits". | |
4514 // A safe rule of thumb is that a thread would never call muxAcquire() | |
4515 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
4516 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
4517 // consume an unpark() permit intended for monitorenter, for instance. | |
4518 // One way around this would be to widen the restricted-range semaphore | |
4519 // implemented in park(). Another alternative would be to provide | |
4520 // multiple instances of the PlatformEvent() for each thread. One | |
4521 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
4522 // | |
4523 // * Usage: | |
4524 // -- Only as leaf locks | |
4525 // -- for short-term locking only as muxAcquire does not perform | |
4526 // thread state transitions. | |
4527 // | |
4528 // Alternatives: | |
4529 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
4530 // but with parking or spin-then-park instead of pure spinning. | |
4531 // * Use Taura-Oyama-Yonenzawa locks. | |
4532 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
4533 // (List,LockByte). Acquire will CAS the full lockword while Release | |
4534 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
4535 // acquiring threads use timers (ParkTimed) to detect and recover from | |
4536 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
4537 // boundaries by using placement-new. | |
4538 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
4539 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
4540 // The validity of the backlinks must be ratified before we trust the value. | |
4541 // If the backlinks are invalid the exiting thread must back-track through the | |
4542 // the forward links, which are always trustworthy. | |
4543 // * Add a successor indication. The LockWord is currently encoded as | |
4544 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
4545 // to provide the usual futile-wakeup optimization. | |
4546 // See RTStt for details. | |
4547 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
4548 // | |
4549 | |
4550 | |
4551 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
4552 enum MuxBits { LOCKBIT = 1 } ; | |
4553 | |
4554 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
4555 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4556 if (w == 0) return ; | |
4557 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4558 return ; | |
4559 } | |
4560 | |
4561 TEVENT (muxAcquire - Contention) ; | |
4562 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
4563 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
0 | 4564 for (;;) { |
1878 | 4565 int its = (os::is_MP() ? 100 : 0) + 1 ; |
4566 | |
4567 // Optional spin phase: spin-then-park strategy | |
4568 while (--its >= 0) { | |
4569 w = *Lock ; | |
4570 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4571 return ; | |
4572 } | |
4573 } | |
4574 | |
4575 Self->reset() ; | |
4576 Self->OnList = intptr_t(Lock) ; | |
4577 // The following fence() isn't _strictly necessary as the subsequent | |
4578 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4579 OrderAccess::fence(); | |
4580 for (;;) { | |
4581 w = *Lock ; | |
4582 if ((w & LOCKBIT) == 0) { | |
4583 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4584 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
4585 return ; | |
4586 } | |
4587 continue ; // Interference -- *Lock changed -- Just retry | |
0 | 4588 } |
1878 | 4589 assert (w & LOCKBIT, "invariant") ; |
4590 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4591 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
4592 } | |
4593 | |
4594 while (Self->OnList != 0) { | |
4595 Self->park() ; | |
4596 } | |
0 | 4597 } |
4598 } | |
4599 | |
1878 | 4600 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
4601 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4602 if (w == 0) return ; | |
4603 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4604 return ; | |
4605 } | |
4606 | |
4607 TEVENT (muxAcquire - Contention) ; | |
4608 ParkEvent * ReleaseAfter = NULL ; | |
4609 if (ev == NULL) { | |
4610 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
4611 } | |
4612 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
4613 for (;;) { | |
4614 guarantee (ev->OnList == 0, "invariant") ; | |
4615 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
4616 | |
4617 // Optional spin phase: spin-then-park strategy | |
4618 while (--its >= 0) { | |
4619 w = *Lock ; | |
4620 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4621 if (ReleaseAfter != NULL) { | |
4622 ParkEvent::Release (ReleaseAfter) ; | |
4623 } | |
4624 return ; | |
4625 } | |
4626 } | |
4627 | |
4628 ev->reset() ; | |
4629 ev->OnList = intptr_t(Lock) ; | |
4630 // The following fence() isn't _strictly necessary as the subsequent | |
4631 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4632 OrderAccess::fence(); | |
4633 for (;;) { | |
4634 w = *Lock ; | |
4635 if ((w & LOCKBIT) == 0) { | |
4636 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4637 ev->OnList = 0 ; | |
4638 // We call ::Release while holding the outer lock, thus | |
4639 // artificially lengthening the critical section. | |
4640 // Consider deferring the ::Release() until the subsequent unlock(), | |
4641 // after we've dropped the outer lock. | |
4642 if (ReleaseAfter != NULL) { | |
4643 ParkEvent::Release (ReleaseAfter) ; | |
4644 } | |
4645 return ; | |
4646 } | |
4647 continue ; // Interference -- *Lock changed -- Just retry | |
4648 } | |
4649 assert (w & LOCKBIT, "invariant") ; | |
4650 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4651 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
4652 } | |
4653 | |
4654 while (ev->OnList != 0) { | |
4655 ev->park() ; | |
4656 } | |
4657 } | |
4658 } | |
4659 | |
4660 // Release() must extract a successor from the list and then wake that thread. | |
4661 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
4662 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
4663 // Release() would : | |
4664 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
4665 // (B) Extract a successor from the private list "in-hand" | |
4666 // (C) attempt to CAS() the residual back into *Lock over null. | |
4667 // If there were any newly arrived threads and the CAS() would fail. | |
4668 // In that case Release() would detach the RATs, re-merge the list in-hand | |
4669 // with the RATs and repeat as needed. Alternately, Release() might | |
4670 // detach and extract a successor, but then pass the residual list to the wakee. | |
4671 // The wakee would be responsible for reattaching and remerging before it | |
4672 // competed for the lock. | |
4673 // | |
4674 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
4675 // multiple concurrent pushers, but only one popper or detacher. | |
4676 // This implementation pops from the head of the list. This is unfair, | |
4677 // but tends to provide excellent throughput as hot threads remain hot. | |
4678 // (We wake recently run threads first). | |
4679 | |
4680 void Thread::muxRelease (volatile intptr_t * Lock) { | |
4681 for (;;) { | |
4682 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
4683 assert (w & LOCKBIT, "invariant") ; | |
4684 if (w == LOCKBIT) return ; | |
4685 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
4686 assert (List != NULL, "invariant") ; | |
4687 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
4688 ParkEvent * nxt = List->ListNext ; | |
4689 | |
4690 // The following CAS() releases the lock and pops the head element. | |
4691 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
4692 continue ; | |
4693 } | |
4694 List->OnList = 0 ; | |
4695 OrderAccess::fence() ; | |
4696 List->unpark () ; | |
4697 return ; | |
4698 } | |
4699 } | |
4700 | |
4701 | |
0 | 4702 void Threads::verify() { |
4703 ALL_JAVA_THREADS(p) { | |
4704 p->verify(); | |
4705 } | |
4706 VMThread* thread = VMThread::vm_thread(); | |
4707 if (thread != NULL) thread->verify(); | |
4708 } |