Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 4668:3dbcd1013cc8
added flag PrintDeoptimizationDetails
changes so that TraceDeoptimization only prints basic information
added nicer formatting for printing interpreter stack frames
| author | Christian Haeubl <christian.haeubl@oracle.com> |
|---|---|
| date | Tue, 21 Feb 2012 16:05:46 -0800 |
| parents | 723df37192d6 |
| children | 33df1aeaebbf |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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2 * Copyright (c) 1997, 2011, 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" |
| 1972 | 39 #include "memory/oopFactory.hpp" |
| 40 #include "memory/universe.inline.hpp" | |
| 41 #include "oops/instanceKlass.hpp" | |
| 42 #include "oops/objArrayOop.hpp" | |
| 43 #include "oops/oop.inline.hpp" | |
|
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44 #include "oops/symbol.hpp" |
| 1972 | 45 #include "prims/jvm_misc.hpp" |
| 46 #include "prims/jvmtiExport.hpp" | |
| 47 #include "prims/jvmtiThreadState.hpp" | |
| 48 #include "prims/privilegedStack.hpp" | |
| 49 #include "runtime/aprofiler.hpp" | |
| 50 #include "runtime/arguments.hpp" | |
| 51 #include "runtime/biasedLocking.hpp" | |
| 52 #include "runtime/deoptimization.hpp" | |
| 53 #include "runtime/fprofiler.hpp" | |
| 54 #include "runtime/frame.inline.hpp" | |
| 55 #include "runtime/init.hpp" | |
| 56 #include "runtime/interfaceSupport.hpp" | |
| 57 #include "runtime/java.hpp" | |
| 58 #include "runtime/javaCalls.hpp" | |
| 59 #include "runtime/jniPeriodicChecker.hpp" | |
| 60 #include "runtime/memprofiler.hpp" | |
| 61 #include "runtime/mutexLocker.hpp" | |
| 62 #include "runtime/objectMonitor.hpp" | |
| 63 #include "runtime/osThread.hpp" | |
| 64 #include "runtime/safepoint.hpp" | |
| 65 #include "runtime/sharedRuntime.hpp" | |
| 66 #include "runtime/statSampler.hpp" | |
| 67 #include "runtime/stubRoutines.hpp" | |
| 68 #include "runtime/task.hpp" | |
| 69 #include "runtime/threadCritical.hpp" | |
| 70 #include "runtime/threadLocalStorage.hpp" | |
| 71 #include "runtime/vframe.hpp" | |
| 72 #include "runtime/vframeArray.hpp" | |
| 73 #include "runtime/vframe_hp.hpp" | |
| 74 #include "runtime/vmThread.hpp" | |
| 75 #include "runtime/vm_operations.hpp" | |
| 76 #include "services/attachListener.hpp" | |
| 77 #include "services/management.hpp" | |
| 78 #include "services/threadService.hpp" | |
| 79 #include "utilities/defaultStream.hpp" | |
| 80 #include "utilities/dtrace.hpp" | |
| 81 #include "utilities/events.hpp" | |
| 82 #include "utilities/preserveException.hpp" | |
| 83 #ifdef TARGET_OS_FAMILY_linux | |
| 84 # include "os_linux.inline.hpp" | |
| 85 # include "thread_linux.inline.hpp" | |
| 86 #endif | |
| 87 #ifdef TARGET_OS_FAMILY_solaris | |
| 88 # include "os_solaris.inline.hpp" | |
| 89 # include "thread_solaris.inline.hpp" | |
| 90 #endif | |
| 91 #ifdef TARGET_OS_FAMILY_windows | |
| 92 # include "os_windows.inline.hpp" | |
| 93 # include "thread_windows.inline.hpp" | |
| 94 #endif | |
| 3960 | 95 #ifdef TARGET_OS_FAMILY_bsd |
| 96 # include "os_bsd.inline.hpp" | |
| 97 # include "thread_bsd.inline.hpp" | |
| 98 #endif | |
| 1972 | 99 #ifndef SERIALGC |
| 100 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
| 101 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
| 102 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
| 103 #endif | |
| 104 #ifdef COMPILER1 | |
| 105 #include "c1/c1_Compiler.hpp" | |
| 106 #endif | |
| 107 #ifdef COMPILER2 | |
| 108 #include "opto/c2compiler.hpp" | |
| 109 #include "opto/idealGraphPrinter.hpp" | |
| 110 #endif | |
| 0 | 111 |
| 112 #ifdef DTRACE_ENABLED | |
| 113 | |
| 114 // Only bother with this argument setup if dtrace is available | |
| 115 | |
| 4006 | 116 #ifndef USDT2 |
| 0 | 117 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
| 118 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
| 119 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
| 120 intptr_t, intptr_t, bool); | |
| 121 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
| 122 intptr_t, intptr_t, bool); | |
| 123 | |
| 124 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 125 { \ | |
| 126 ResourceMark rm(this); \ | |
| 127 int len = 0; \ | |
| 128 const char* name = (javathread)->get_thread_name(); \ | |
| 129 len = strlen(name); \ | |
| 130 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
| 131 name, len, \ | |
| 132 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 133 (javathread)->osthread()->thread_id(), \ | |
| 134 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 135 } | |
| 136 | |
| 4006 | 137 #else /* USDT2 */ |
| 138 | |
| 139 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
| 140 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
| 141 | |
| 142 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 143 { \ | |
| 144 ResourceMark rm(this); \ | |
| 145 int len = 0; \ | |
| 146 const char* name = (javathread)->get_thread_name(); \ | |
| 147 len = strlen(name); \ | |
| 148 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
| 149 (char *) name, len, \ | |
| 150 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 151 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
| 152 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 153 } | |
| 154 | |
| 155 #endif /* USDT2 */ | |
| 156 | |
| 0 | 157 #else // ndef DTRACE_ENABLED |
| 158 | |
| 159 #define DTRACE_THREAD_PROBE(probe, javathread) | |
| 160 | |
| 161 #endif // ndef DTRACE_ENABLED | |
| 162 | |
| 163 // Class hierarchy | |
| 164 // - Thread | |
| 165 // - VMThread | |
| 166 // - WatcherThread | |
| 167 // - ConcurrentMarkSweepThread | |
| 168 // - JavaThread | |
| 169 // - CompilerThread | |
| 170 | |
| 171 // ======= Thread ======== | |
| 172 | |
| 173 // Support for forcing alignment of thread objects for biased locking | |
| 174 void* Thread::operator new(size_t size) { | |
| 175 if (UseBiasedLocking) { | |
| 176 const int alignment = markOopDesc::biased_lock_alignment; | |
| 177 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
| 178 void* real_malloc_addr = CHeapObj::operator new(aligned_size); | |
| 179 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); | |
| 180 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
| 181 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
| 182 "JavaThread alignment code overflowed allocated storage"); | |
| 183 if (TraceBiasedLocking) { | |
| 184 if (aligned_addr != real_malloc_addr) | |
| 185 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
| 186 real_malloc_addr, aligned_addr); | |
| 187 } | |
| 188 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
| 189 return aligned_addr; | |
| 190 } else { | |
| 191 return CHeapObj::operator new(size); | |
| 192 } | |
| 193 } | |
| 194 | |
| 195 void Thread::operator delete(void* p) { | |
| 196 if (UseBiasedLocking) { | |
| 197 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
| 198 CHeapObj::operator delete(real_malloc_addr); | |
| 199 } else { | |
| 200 CHeapObj::operator delete(p); | |
| 201 } | |
| 202 } | |
| 203 | |
| 204 | |
| 205 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
| 206 // JavaThread | |
| 207 | |
| 208 | |
| 209 Thread::Thread() { | |
|
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210 // stack and get_thread |
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211 set_stack_base(NULL); |
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212 set_stack_size(0); |
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213 set_self_raw_id(0); |
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214 set_lgrp_id(-1); |
| 0 | 215 |
| 216 // allocated data structures | |
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217 set_osthread(NULL); |
| 0 | 218 set_resource_area(new ResourceArea()); |
| 219 set_handle_area(new HandleArea(NULL)); | |
| 220 set_active_handles(NULL); | |
| 221 set_free_handle_block(NULL); | |
| 222 set_last_handle_mark(NULL); | |
| 223 | |
| 224 // This initial value ==> never claimed. | |
| 225 _oops_do_parity = 0; | |
| 226 | |
| 227 // the handle mark links itself to last_handle_mark | |
| 228 new HandleMark(this); | |
| 229 | |
| 230 // plain initialization | |
| 231 debug_only(_owned_locks = NULL;) | |
| 232 debug_only(_allow_allocation_count = 0;) | |
| 233 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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234 NOT_PRODUCT(_skip_gcalot = false;) |
| 0 | 235 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
| 236 _jvmti_env_iteration_count = 0; | |
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237 set_allocated_bytes(0); |
| 0 | 238 _vm_operation_started_count = 0; |
| 239 _vm_operation_completed_count = 0; | |
| 240 _current_pending_monitor = NULL; | |
| 241 _current_pending_monitor_is_from_java = true; | |
| 242 _current_waiting_monitor = NULL; | |
| 243 _num_nested_signal = 0; | |
| 244 omFreeList = NULL ; | |
| 245 omFreeCount = 0 ; | |
| 246 omFreeProvision = 32 ; | |
| 1587 | 247 omInUseList = NULL ; |
| 248 omInUseCount = 0 ; | |
| 0 | 249 |
| 250 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); | |
| 251 _suspend_flags = 0; | |
| 252 | |
| 253 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
| 254 _hashStateX = os::random() ; | |
| 255 _hashStateY = 842502087 ; | |
| 256 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
| 257 _hashStateW = 273326509 ; | |
| 258 | |
| 259 _OnTrap = 0 ; | |
| 260 _schedctl = NULL ; | |
| 261 _Stalled = 0 ; | |
| 262 _TypeTag = 0x2BAD ; | |
| 263 | |
| 264 // Many of the following fields are effectively final - immutable | |
| 265 // Note that nascent threads can't use the Native Monitor-Mutex | |
| 266 // construct until the _MutexEvent is initialized ... | |
| 267 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
| 268 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
| 269 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
| 270 // and ::Release() | |
| 271 _ParkEvent = ParkEvent::Allocate (this) ; | |
| 272 _SleepEvent = ParkEvent::Allocate (this) ; | |
| 273 _MutexEvent = ParkEvent::Allocate (this) ; | |
| 274 _MuxEvent = ParkEvent::Allocate (this) ; | |
| 275 | |
| 276 #ifdef CHECK_UNHANDLED_OOPS | |
| 277 if (CheckUnhandledOops) { | |
| 278 _unhandled_oops = new UnhandledOops(this); | |
| 279 } | |
| 280 #endif // CHECK_UNHANDLED_OOPS | |
| 281 #ifdef ASSERT | |
| 282 if (UseBiasedLocking) { | |
| 283 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
| 284 assert(this == _real_malloc_address || | |
| 285 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
| 286 "bug in forced alignment of thread objects"); | |
| 287 } | |
| 288 #endif /* ASSERT */ | |
| 289 } | |
| 290 | |
| 291 void Thread::initialize_thread_local_storage() { | |
| 292 // Note: Make sure this method only calls | |
| 293 // non-blocking operations. Otherwise, it might not work | |
| 294 // with the thread-startup/safepoint interaction. | |
| 295 | |
| 296 // During Java thread startup, safepoint code should allow this | |
| 297 // method to complete because it may need to allocate memory to | |
| 298 // store information for the new thread. | |
| 299 | |
| 300 // initialize structure dependent on thread local storage | |
| 301 ThreadLocalStorage::set_thread(this); | |
| 302 | |
| 303 // set up any platform-specific state. | |
| 304 os::initialize_thread(); | |
| 305 | |
| 306 } | |
| 307 | |
| 308 void Thread::record_stack_base_and_size() { | |
| 309 set_stack_base(os::current_stack_base()); | |
| 310 set_stack_size(os::current_stack_size()); | |
| 311 } | |
| 312 | |
| 313 | |
| 314 Thread::~Thread() { | |
| 315 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
| 316 ObjectSynchronizer::omFlush (this) ; | |
| 317 | |
| 318 // deallocate data structures | |
| 319 delete resource_area(); | |
| 320 // since the handle marks are using the handle area, we have to deallocated the root | |
| 321 // handle mark before deallocating the thread's handle area, | |
| 322 assert(last_handle_mark() != NULL, "check we have an element"); | |
| 323 delete last_handle_mark(); | |
| 324 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
| 325 | |
| 326 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
| 327 // We NULL out the fields for good hygiene. | |
| 328 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
| 329 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
| 330 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
| 331 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
| 332 | |
| 333 delete handle_area(); | |
| 334 | |
| 335 // osthread() can be NULL, if creation of thread failed. | |
| 336 if (osthread() != NULL) os::free_thread(osthread()); | |
| 337 | |
| 338 delete _SR_lock; | |
| 339 | |
| 340 // clear thread local storage if the Thread is deleting itself | |
| 341 if (this == Thread::current()) { | |
| 342 ThreadLocalStorage::set_thread(NULL); | |
| 343 } else { | |
| 344 // In the case where we're not the current thread, invalidate all the | |
| 345 // caches in case some code tries to get the current thread or the | |
| 346 // thread that was destroyed, and gets stale information. | |
| 347 ThreadLocalStorage::invalidate_all(); | |
| 348 } | |
| 349 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
| 350 } | |
| 351 | |
| 352 // NOTE: dummy function for assertion purpose. | |
| 353 void Thread::run() { | |
| 354 ShouldNotReachHere(); | |
| 355 } | |
| 356 | |
| 357 #ifdef ASSERT | |
| 358 // Private method to check for dangling thread pointer | |
| 359 void check_for_dangling_thread_pointer(Thread *thread) { | |
| 360 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 361 "possibility of dangling Thread pointer"); | |
| 362 } | |
| 363 #endif | |
| 364 | |
| 365 | |
| 366 #ifndef PRODUCT | |
| 367 // Tracing method for basic thread operations | |
| 368 void Thread::trace(const char* msg, const Thread* const thread) { | |
| 369 if (!TraceThreadEvents) return; | |
| 370 ResourceMark rm; | |
| 371 ThreadCritical tc; | |
| 372 const char *name = "non-Java thread"; | |
| 373 int prio = -1; | |
| 374 if (thread->is_Java_thread() | |
| 375 && !thread->is_Compiler_thread()) { | |
| 376 // The Threads_lock must be held to get information about | |
| 377 // this thread but may not be in some situations when | |
| 378 // tracing thread events. | |
| 379 bool release_Threads_lock = false; | |
| 380 if (!Threads_lock->owned_by_self()) { | |
| 381 Threads_lock->lock(); | |
| 382 release_Threads_lock = true; | |
| 383 } | |
| 384 JavaThread* jt = (JavaThread *)thread; | |
| 385 name = (char *)jt->get_thread_name(); | |
| 386 oop thread_oop = jt->threadObj(); | |
| 387 if (thread_oop != NULL) { | |
| 388 prio = java_lang_Thread::priority(thread_oop); | |
| 389 } | |
| 390 if (release_Threads_lock) { | |
| 391 Threads_lock->unlock(); | |
| 392 } | |
| 393 } | |
| 394 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
| 395 } | |
| 396 #endif | |
| 397 | |
| 398 | |
| 399 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
| 400 trace("get priority", thread); | |
| 401 ThreadPriority priority; | |
| 402 // Can return an error! | |
| 403 (void)os::get_priority(thread, priority); | |
| 404 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
| 405 return priority; | |
| 406 } | |
| 407 | |
| 408 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
| 409 trace("set priority", thread); | |
| 410 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 411 // Can return an error! | |
| 412 (void)os::set_priority(thread, priority); | |
| 413 } | |
| 414 | |
| 415 | |
| 416 void Thread::start(Thread* thread) { | |
| 417 trace("start", thread); | |
| 418 // Start is different from resume in that its safety is guaranteed by context or | |
| 419 // being called from a Java method synchronized on the Thread object. | |
| 420 if (!DisableStartThread) { | |
| 421 if (thread->is_Java_thread()) { | |
| 422 // Initialize the thread state to RUNNABLE before starting this thread. | |
| 423 // Can not set it after the thread started because we do not know the | |
| 424 // exact thread state at that time. It could be in MONITOR_WAIT or | |
| 425 // in SLEEPING or some other state. | |
| 426 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
| 427 java_lang_Thread::RUNNABLE); | |
| 428 } | |
| 429 os::start_thread(thread); | |
| 430 } | |
| 431 } | |
| 432 | |
| 433 // Enqueue a VM_Operation to do the job for us - sometime later | |
| 434 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
| 435 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
| 436 VMThread::execute(vm_stop); | |
| 437 } | |
| 438 | |
| 439 | |
| 440 // | |
| 441 // Check if an external suspend request has completed (or has been | |
| 442 // cancelled). Returns true if the thread is externally suspended and | |
| 443 // false otherwise. | |
| 444 // | |
| 445 // The bits parameter returns information about the code path through | |
| 446 // the routine. Useful for debugging: | |
| 447 // | |
| 448 // set in is_ext_suspend_completed(): | |
| 449 // 0x00000001 - routine was entered | |
| 450 // 0x00000010 - routine return false at end | |
| 451 // 0x00000100 - thread exited (return false) | |
| 452 // 0x00000200 - suspend request cancelled (return false) | |
| 453 // 0x00000400 - thread suspended (return true) | |
| 454 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
| 455 // 0x00002000 - thread is native and walkable (return true) | |
| 456 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
| 457 // | |
| 458 // set in wait_for_ext_suspend_completion(): | |
| 459 // 0x00010000 - routine was entered | |
| 460 // 0x00020000 - suspend request cancelled before loop (return false) | |
| 461 // 0x00040000 - thread suspended before loop (return true) | |
| 462 // 0x00080000 - suspend request cancelled in loop (return false) | |
| 463 // 0x00100000 - thread suspended in loop (return true) | |
| 464 // 0x00200000 - suspend not completed during retry loop (return false) | |
| 465 // | |
| 466 | |
| 467 // Helper class for tracing suspend wait debug bits. | |
| 468 // | |
| 469 // 0x00000100 indicates that the target thread exited before it could | |
| 470 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
| 471 // 0x00080000 each indicate a cancelled suspend request so they don't | |
| 472 // count as wait failures either. | |
| 473 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
| 474 | |
| 475 class TraceSuspendDebugBits : public StackObj { | |
| 476 private: | |
| 477 JavaThread * jt; | |
| 478 bool is_wait; | |
| 479 bool called_by_wait; // meaningful when !is_wait | |
| 480 uint32_t * bits; | |
| 481 | |
| 482 public: | |
| 483 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
| 484 uint32_t *_bits) { | |
| 485 jt = _jt; | |
| 486 is_wait = _is_wait; | |
| 487 called_by_wait = _called_by_wait; | |
| 488 bits = _bits; | |
| 489 } | |
| 490 | |
| 491 ~TraceSuspendDebugBits() { | |
| 492 if (!is_wait) { | |
| 493 #if 1 | |
| 494 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
| 495 // That trace is very chatty. | |
| 496 return; | |
| 497 #else | |
| 498 if (!called_by_wait) { | |
| 499 // If tracing for is_ext_suspend_completed() is enabled, then only | |
| 500 // trace calls to it from wait_for_ext_suspend_completion() | |
| 501 return; | |
| 502 } | |
| 503 #endif | |
| 504 } | |
| 505 | |
| 506 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
| 507 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
| 508 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
| 509 ResourceMark rm; | |
| 510 | |
| 511 tty->print_cr( | |
| 512 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
| 513 jt->get_thread_name(), *bits); | |
| 514 | |
| 515 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
| 516 } | |
| 517 } | |
| 518 } | |
| 519 }; | |
| 520 #undef DEBUG_FALSE_BITS | |
| 521 | |
| 522 | |
| 523 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
| 524 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
| 525 | |
| 526 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
| 527 bool do_trans_retry; // flag to force the retry | |
| 528 | |
| 529 *bits |= 0x00000001; | |
| 530 | |
| 531 do { | |
| 532 do_trans_retry = false; | |
| 533 | |
| 534 if (is_exiting()) { | |
| 535 // Thread is in the process of exiting. This is always checked | |
| 536 // first to reduce the risk of dereferencing a freed JavaThread. | |
| 537 *bits |= 0x00000100; | |
| 538 return false; | |
| 539 } | |
| 540 | |
| 541 if (!is_external_suspend()) { | |
| 542 // Suspend request is cancelled. This is always checked before | |
| 543 // is_ext_suspended() to reduce the risk of a rogue resume | |
| 544 // confusing the thread that made the suspend request. | |
| 545 *bits |= 0x00000200; | |
| 546 return false; | |
| 547 } | |
| 548 | |
| 549 if (is_ext_suspended()) { | |
| 550 // thread is suspended | |
| 551 *bits |= 0x00000400; | |
| 552 return true; | |
| 553 } | |
| 554 | |
| 555 // Now that we no longer do hard suspends of threads running | |
| 556 // native code, the target thread can be changing thread state | |
| 557 // while we are in this routine: | |
| 558 // | |
| 559 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
| 560 // | |
| 561 // We save a copy of the thread state as observed at this moment | |
| 562 // and make our decision about suspend completeness based on the | |
| 563 // copy. This closes the race where the thread state is seen as | |
| 564 // _thread_in_native_trans in the if-thread_blocked check, but is | |
| 565 // seen as _thread_blocked in if-thread_in_native_trans check. | |
| 566 JavaThreadState save_state = thread_state(); | |
| 567 | |
| 568 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
| 569 // If the thread's state is _thread_blocked and this blocking | |
| 570 // condition is known to be equivalent to a suspend, then we can | |
| 571 // consider the thread to be externally suspended. This means that | |
| 572 // the code that sets _thread_blocked has been modified to do | |
| 573 // self-suspension if the blocking condition releases. We also | |
| 574 // used to check for CONDVAR_WAIT here, but that is now covered by | |
| 575 // the _thread_blocked with self-suspension check. | |
| 576 // | |
| 577 // Return true since we wouldn't be here unless there was still an | |
| 578 // external suspend request. | |
| 579 *bits |= 0x00001000; | |
| 580 return true; | |
| 581 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
| 582 // Threads running native code will self-suspend on native==>VM/Java | |
| 583 // transitions. If its stack is walkable (should always be the case | |
| 584 // unless this function is called before the actual java_suspend() | |
| 585 // call), then the wait is done. | |
| 586 *bits |= 0x00002000; | |
| 587 return true; | |
| 588 } else if (!called_by_wait && !did_trans_retry && | |
| 589 save_state == _thread_in_native_trans && | |
| 590 frame_anchor()->walkable()) { | |
| 591 // The thread is transitioning from thread_in_native to another | |
| 592 // thread state. check_safepoint_and_suspend_for_native_trans() | |
| 593 // will force the thread to self-suspend. If it hasn't gotten | |
| 594 // there yet we may have caught the thread in-between the native | |
| 595 // code check above and the self-suspend. Lucky us. If we were | |
| 596 // called by wait_for_ext_suspend_completion(), then it | |
| 597 // will be doing the retries so we don't have to. | |
| 598 // | |
| 599 // Since we use the saved thread state in the if-statement above, | |
| 600 // there is a chance that the thread has already transitioned to | |
| 601 // _thread_blocked by the time we get here. In that case, we will | |
| 602 // make a single unnecessary pass through the logic below. This | |
| 603 // doesn't hurt anything since we still do the trans retry. | |
| 604 | |
| 605 *bits |= 0x00004000; | |
| 606 | |
| 607 // Once the thread leaves thread_in_native_trans for another | |
| 608 // thread state, we break out of this retry loop. We shouldn't | |
| 609 // need this flag to prevent us from getting back here, but | |
| 610 // sometimes paranoia is good. | |
| 611 did_trans_retry = true; | |
| 612 | |
| 613 // We wait for the thread to transition to a more usable state. | |
| 614 for (int i = 1; i <= SuspendRetryCount; i++) { | |
| 615 // We used to do an "os::yield_all(i)" call here with the intention | |
| 616 // that yielding would increase on each retry. However, the parameter | |
| 617 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 618 // on the SR_lock below provides a much more predictable scale up for | |
| 619 // the delay. It also provides a simple/direct point to check for any | |
| 620 // safepoint requests from the VMThread | |
| 621 | |
| 622 // temporarily drops SR_lock while doing wait with safepoint check | |
| 623 // (if we're a JavaThread - the WatcherThread can also call this) | |
| 624 // and increase delay with each retry | |
| 625 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 626 | |
| 627 // check the actual thread state instead of what we saved above | |
| 628 if (thread_state() != _thread_in_native_trans) { | |
| 629 // the thread has transitioned to another thread state so | |
| 630 // try all the checks (except this one) one more time. | |
| 631 do_trans_retry = true; | |
| 632 break; | |
| 633 } | |
| 634 } // end retry loop | |
| 635 | |
| 636 | |
| 637 } | |
| 638 } while (do_trans_retry); | |
| 639 | |
| 640 *bits |= 0x00000010; | |
| 641 return false; | |
| 642 } | |
| 643 | |
| 644 // | |
| 645 // Wait for an external suspend request to complete (or be cancelled). | |
| 646 // Returns true if the thread is externally suspended and false otherwise. | |
| 647 // | |
| 648 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
| 649 uint32_t *bits) { | |
| 650 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
| 651 false /* !called_by_wait */, bits); | |
| 652 | |
| 653 // local flag copies to minimize SR_lock hold time | |
| 654 bool is_suspended; | |
| 655 bool pending; | |
| 656 uint32_t reset_bits; | |
| 657 | |
| 658 // set a marker so is_ext_suspend_completed() knows we are the caller | |
| 659 *bits |= 0x00010000; | |
| 660 | |
| 661 // We use reset_bits to reinitialize the bits value at the top of | |
| 662 // each retry loop. This allows the caller to make use of any | |
| 663 // unused bits for their own marking purposes. | |
| 664 reset_bits = *bits; | |
| 665 | |
| 666 { | |
| 667 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 668 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 669 delay, bits); | |
| 670 pending = is_external_suspend(); | |
| 671 } | |
| 672 // must release SR_lock to allow suspension to complete | |
| 673 | |
| 674 if (!pending) { | |
| 675 // A cancelled suspend request is the only false return from | |
| 676 // is_ext_suspend_completed() that keeps us from entering the | |
| 677 // retry loop. | |
| 678 *bits |= 0x00020000; | |
| 679 return false; | |
| 680 } | |
| 681 | |
| 682 if (is_suspended) { | |
| 683 *bits |= 0x00040000; | |
| 684 return true; | |
| 685 } | |
| 686 | |
| 687 for (int i = 1; i <= retries; i++) { | |
| 688 *bits = reset_bits; // reinit to only track last retry | |
| 689 | |
| 690 // We used to do an "os::yield_all(i)" call here with the intention | |
| 691 // that yielding would increase on each retry. However, the parameter | |
| 692 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 693 // on the SR_lock below provides a much more predictable scale up for | |
| 694 // the delay. It also provides a simple/direct point to check for any | |
| 695 // safepoint requests from the VMThread | |
| 696 | |
| 697 { | |
| 698 MutexLocker ml(SR_lock()); | |
| 699 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
| 700 // can also call this) and increase delay with each retry | |
| 701 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 702 | |
| 703 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 704 delay, bits); | |
| 705 | |
| 706 // It is possible for the external suspend request to be cancelled | |
| 707 // (by a resume) before the actual suspend operation is completed. | |
| 708 // Refresh our local copy to see if we still need to wait. | |
| 709 pending = is_external_suspend(); | |
| 710 } | |
| 711 | |
| 712 if (!pending) { | |
| 713 // A cancelled suspend request is the only false return from | |
| 714 // is_ext_suspend_completed() that keeps us from staying in the | |
| 715 // retry loop. | |
| 716 *bits |= 0x00080000; | |
| 717 return false; | |
| 718 } | |
| 719 | |
| 720 if (is_suspended) { | |
| 721 *bits |= 0x00100000; | |
| 722 return true; | |
| 723 } | |
| 724 } // end retry loop | |
| 725 | |
| 726 // thread did not suspend after all our retries | |
| 727 *bits |= 0x00200000; | |
| 728 return false; | |
| 729 } | |
| 730 | |
| 731 #ifndef PRODUCT | |
| 732 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
| 733 | |
| 734 // This should not need to be atomic as the only way for simultaneous | |
| 735 // updates is via interrupts. Even then this should be rare or non-existant | |
| 736 // and we don't care that much anyway. | |
| 737 | |
| 738 int index = _jmp_ring_index; | |
| 739 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
| 740 _jmp_ring[index]._target = (intptr_t) target; | |
| 741 _jmp_ring[index]._instruction = (intptr_t) instr; | |
| 742 _jmp_ring[index]._file = file; | |
| 743 _jmp_ring[index]._line = line; | |
| 744 } | |
| 745 #endif /* PRODUCT */ | |
| 746 | |
| 747 // Called by flat profiler | |
| 748 // Callers have already called wait_for_ext_suspend_completion | |
| 749 // The assertion for that is currently too complex to put here: | |
| 750 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
| 751 bool gotframe = false; | |
| 752 // self suspension saves needed state. | |
| 753 if (has_last_Java_frame() && _anchor.walkable()) { | |
| 754 *_fr = pd_last_frame(); | |
| 755 gotframe = true; | |
| 756 } | |
| 757 return gotframe; | |
| 758 } | |
| 759 | |
| 760 void Thread::interrupt(Thread* thread) { | |
| 761 trace("interrupt", thread); | |
| 762 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 763 os::interrupt(thread); | |
| 764 } | |
| 765 | |
| 766 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 767 trace("is_interrupted", thread); | |
| 768 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 769 // Note: If clear_interrupted==false, this simply fetches and | |
| 770 // returns the value of the field osthread()->interrupted(). | |
| 771 return os::is_interrupted(thread, clear_interrupted); | |
| 772 } | |
| 773 | |
| 774 | |
| 775 // GC Support | |
| 776 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
| 777 jint thread_parity = _oops_do_parity; | |
| 778 if (thread_parity != strong_roots_parity) { | |
| 779 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
|
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780 if (res == thread_parity) { |
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781 return true; |
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782 } else { |
| 0 | 783 guarantee(res == strong_roots_parity, "Or else what?"); |
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784 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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785 "Should only fail when parallel."); |
| 0 | 786 return false; |
| 787 } | |
| 788 } | |
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789 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
| 0 | 790 "Should only fail when parallel."); |
| 791 return false; | |
| 792 } | |
| 793 | |
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794 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 795 active_handles()->oops_do(f); |
| 796 // Do oop for ThreadShadow | |
| 797 f->do_oop((oop*)&_pending_exception); | |
| 798 handle_area()->oops_do(f); | |
| 799 } | |
| 800 | |
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801 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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802 // no nmethods in a generic thread... |
| 0 | 803 } |
| 804 | |
| 805 void Thread::print_on(outputStream* st) const { | |
| 806 // get_priority assumes osthread initialized | |
| 807 if (osthread() != NULL) { | |
| 808 st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this); | |
| 809 osthread()->print_on(st); | |
| 810 } | |
| 811 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
| 812 } | |
| 813 | |
| 814 // Thread::print_on_error() is called by fatal error handler. Don't use | |
| 815 // any lock or allocate memory. | |
| 816 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
| 817 if (is_VM_thread()) st->print("VMThread"); | |
| 818 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
| 819 else if (is_Java_thread()) st->print("JavaThread"); | |
| 820 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
| 821 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
| 822 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
| 823 else st->print("Thread"); | |
| 824 | |
| 825 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
| 826 _stack_base - _stack_size, _stack_base); | |
| 827 | |
| 828 if (osthread()) { | |
| 829 st->print(" [id=%d]", osthread()->thread_id()); | |
| 830 } | |
| 831 } | |
| 832 | |
| 833 #ifdef ASSERT | |
| 834 void Thread::print_owned_locks_on(outputStream* st) const { | |
| 835 Monitor *cur = _owned_locks; | |
| 836 if (cur == NULL) { | |
| 837 st->print(" (no locks) "); | |
| 838 } else { | |
| 839 st->print_cr(" Locks owned:"); | |
| 840 while(cur) { | |
| 841 cur->print_on(st); | |
| 842 cur = cur->next(); | |
| 843 } | |
| 844 } | |
| 845 } | |
| 846 | |
| 847 static int ref_use_count = 0; | |
| 848 | |
| 849 bool Thread::owns_locks_but_compiled_lock() const { | |
| 850 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 851 if (cur != Compile_lock) return true; | |
| 852 } | |
| 853 return false; | |
| 854 } | |
| 855 | |
| 856 | |
| 857 #endif | |
| 858 | |
| 859 #ifndef PRODUCT | |
| 860 | |
| 861 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
| 862 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
| 863 // no threads which allow_vm_block's are held | |
| 864 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
| 865 // Check if current thread is allowed to block at a safepoint | |
| 866 if (!(_allow_safepoint_count == 0)) | |
| 867 fatal("Possible safepoint reached by thread that does not allow it"); | |
| 868 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
| 869 fatal("LEAF method calling lock?"); | |
| 870 } | |
| 871 | |
| 872 #ifdef ASSERT | |
| 873 if (potential_vm_operation && is_Java_thread() | |
| 874 && !Universe::is_bootstrapping()) { | |
| 875 // Make sure we do not hold any locks that the VM thread also uses. | |
| 876 // This could potentially lead to deadlocks | |
| 877 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 878 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
| 879 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
| 880 // since it is used to transfer control between JavaThreads and the VMThread | |
| 881 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
| 882 if ( (cur->allow_vm_block() && | |
| 883 cur != Threads_lock && | |
| 884 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
| 885 cur != VMOperationRequest_lock && | |
| 886 cur != VMOperationQueue_lock) || | |
| 887 cur->rank() == Mutex::special) { | |
| 888 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
| 889 } | |
| 890 } | |
| 891 } | |
| 892 | |
| 893 if (GCALotAtAllSafepoints) { | |
| 894 // We could enter a safepoint here and thus have a gc | |
| 895 InterfaceSupport::check_gc_alot(); | |
| 896 } | |
| 897 #endif | |
| 898 } | |
| 899 #endif | |
| 900 | |
| 901 bool Thread::is_in_stack(address adr) const { | |
| 902 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
| 903 address end = os::current_stack_pointer(); | |
| 904 if (stack_base() >= adr && adr >= end) return true; | |
| 905 | |
| 906 return false; | |
| 907 } | |
| 908 | |
| 909 | |
| 910 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
| 911 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
| 912 // used for compilation in the future. If that change is made, the need for these methods | |
| 913 // should be revisited, and they should be removed if possible. | |
| 914 | |
| 915 bool Thread::is_lock_owned(address adr) const { | |
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916 return on_local_stack(adr); |
| 0 | 917 } |
| 918 | |
| 919 bool Thread::set_as_starting_thread() { | |
| 920 // NOTE: this must be called inside the main thread. | |
| 921 return os::create_main_thread((JavaThread*)this); | |
| 922 } | |
| 923 | |
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924 static void initialize_class(Symbol* class_name, TRAPS) { |
| 0 | 925 klassOop klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
| 926 instanceKlass::cast(klass)->initialize(CHECK); | |
| 927 } | |
| 928 | |
| 929 | |
| 930 // Creates the initial ThreadGroup | |
| 931 static Handle create_initial_thread_group(TRAPS) { | |
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932 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
| 0 | 933 instanceKlassHandle klass (THREAD, k); |
| 934 | |
| 935 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 936 { | |
| 937 JavaValue result(T_VOID); | |
| 938 JavaCalls::call_special(&result, | |
| 939 system_instance, | |
| 940 klass, | |
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941 vmSymbols::object_initializer_name(), |
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942 vmSymbols::void_method_signature(), |
| 0 | 943 CHECK_NH); |
| 944 } | |
| 945 Universe::set_system_thread_group(system_instance()); | |
| 946 | |
| 947 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 948 { | |
| 949 JavaValue result(T_VOID); | |
| 950 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
| 951 JavaCalls::call_special(&result, | |
| 952 main_instance, | |
| 953 klass, | |
|
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954 vmSymbols::object_initializer_name(), |
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955 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 956 system_instance, |
| 957 string, | |
| 958 CHECK_NH); | |
| 959 } | |
| 960 return main_instance; | |
| 961 } | |
| 962 | |
| 963 // Creates the initial Thread | |
| 964 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
|
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965 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
| 0 | 966 instanceKlassHandle klass (THREAD, k); |
| 967 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
| 968 | |
| 969 java_lang_Thread::set_thread(thread_oop(), thread); | |
| 970 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 971 thread->set_threadObj(thread_oop()); | |
| 972 | |
| 973 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
| 974 | |
| 975 JavaValue result(T_VOID); | |
| 976 JavaCalls::call_special(&result, thread_oop, | |
| 977 klass, | |
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978 vmSymbols::object_initializer_name(), |
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979 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 980 thread_group, |
| 981 string, | |
| 982 CHECK_NULL); | |
| 983 return thread_oop(); | |
| 984 } | |
| 985 | |
| 986 static void call_initializeSystemClass(TRAPS) { | |
|
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987 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 988 instanceKlassHandle klass (THREAD, k); |
| 989 | |
| 990 JavaValue result(T_VOID); | |
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991 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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992 vmSymbols::void_method_signature(), CHECK); |
| 0 | 993 } |
| 994 | |
|
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995 // General purpose hook into Java code, run once when the VM is initialized. |
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996 // The Java library method itself may be changed independently from the VM. |
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997 static void call_postVMInitHook(TRAPS) { |
| 3938 | 998 klassOop k = SystemDictionary::PostVMInitHook_klass(); |
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999 instanceKlassHandle klass (THREAD, k); |
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1000 if (klass.not_null()) { |
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1001 JavaValue result(T_VOID); |
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1002 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1003 vmSymbols::void_method_signature(), |
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1004 CHECK); |
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1005 } |
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1006 } |
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1007 |
| 0 | 1008 static void reset_vm_info_property(TRAPS) { |
| 1009 // the vm info string | |
| 1010 ResourceMark rm(THREAD); | |
| 1011 const char *vm_info = VM_Version::vm_info_string(); | |
| 1012 | |
| 1013 // java.lang.System class | |
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1014 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1015 instanceKlassHandle klass (THREAD, k); |
| 1016 | |
| 1017 // setProperty arguments | |
| 1018 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
| 1019 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
| 1020 | |
| 1021 // return value | |
| 1022 JavaValue r(T_OBJECT); | |
| 1023 | |
| 1024 // public static String setProperty(String key, String value); | |
| 1025 JavaCalls::call_static(&r, | |
| 1026 klass, | |
|
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1027 vmSymbols::setProperty_name(), |
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1028 vmSymbols::string_string_string_signature(), |
| 0 | 1029 key_str, |
| 1030 value_str, | |
| 1031 CHECK); | |
| 1032 } | |
| 1033 | |
| 1034 | |
| 1035 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
| 1036 assert(thread_group.not_null(), "thread group should be specified"); | |
| 1037 assert(threadObj() == NULL, "should only create Java thread object once"); | |
| 1038 | |
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1039 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
| 0 | 1040 instanceKlassHandle klass (THREAD, k); |
| 1041 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 1042 | |
| 1043 java_lang_Thread::set_thread(thread_oop(), this); | |
| 1044 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1045 set_threadObj(thread_oop()); | |
| 1046 | |
| 1047 JavaValue result(T_VOID); | |
| 1048 if (thread_name != NULL) { | |
| 1049 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
| 1050 // Thread gets assigned specified name and null target | |
| 1051 JavaCalls::call_special(&result, | |
| 1052 thread_oop, | |
| 1053 klass, | |
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1054 vmSymbols::object_initializer_name(), |
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1055 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1056 thread_group, // Argument 1 |
| 1057 name, // Argument 2 | |
| 1058 THREAD); | |
| 1059 } else { | |
| 1060 // Thread gets assigned name "Thread-nnn" and null target | |
| 1061 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
| 1062 JavaCalls::call_special(&result, | |
| 1063 thread_oop, | |
| 1064 klass, | |
|
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1065 vmSymbols::object_initializer_name(), |
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1066 vmSymbols::threadgroup_runnable_void_signature(), |
| 0 | 1067 thread_group, // Argument 1 |
| 1068 Handle(), // Argument 2 | |
| 1069 THREAD); | |
| 1070 } | |
| 1071 | |
| 1072 | |
| 1073 if (daemon) { | |
| 1074 java_lang_Thread::set_daemon(thread_oop()); | |
| 1075 } | |
| 1076 | |
| 1077 if (HAS_PENDING_EXCEPTION) { | |
| 1078 return; | |
| 1079 } | |
| 1080 | |
| 1142 | 1081 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1082 Handle threadObj(this, this->threadObj()); |
| 1083 | |
| 1084 JavaCalls::call_special(&result, | |
| 1085 thread_group, | |
| 1086 group, | |
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1087 vmSymbols::add_method_name(), |
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1088 vmSymbols::thread_void_signature(), |
| 0 | 1089 threadObj, // Arg 1 |
| 1090 THREAD); | |
| 1091 | |
| 1092 | |
| 1093 } | |
| 1094 | |
| 1095 // NamedThread -- non-JavaThread subclasses with multiple | |
| 1096 // uniquely named instances should derive from this. | |
| 1097 NamedThread::NamedThread() : Thread() { | |
| 1098 _name = NULL; | |
|
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1099 _processed_thread = NULL; |
| 0 | 1100 } |
| 1101 | |
| 1102 NamedThread::~NamedThread() { | |
| 1103 if (_name != NULL) { | |
| 1104 FREE_C_HEAP_ARRAY(char, _name); | |
| 1105 _name = NULL; | |
| 1106 } | |
| 1107 } | |
| 1108 | |
| 1109 void NamedThread::set_name(const char* format, ...) { | |
| 1110 guarantee(_name == NULL, "Only get to set name once."); | |
| 1111 _name = NEW_C_HEAP_ARRAY(char, max_name_len); | |
| 1112 guarantee(_name != NULL, "alloc failure"); | |
| 1113 va_list ap; | |
| 1114 va_start(ap, format); | |
| 1115 jio_vsnprintf(_name, max_name_len, format, ap); | |
| 1116 va_end(ap); | |
| 1117 } | |
| 1118 | |
| 1119 // ======= WatcherThread ======== | |
| 1120 | |
| 1121 // The watcher thread exists to simulate timer interrupts. It should | |
| 1122 // be replaced by an abstraction over whatever native support for | |
| 1123 // timer interrupts exists on the platform. | |
| 1124 | |
| 1125 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
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1126 volatile bool WatcherThread::_should_terminate = false; |
| 0 | 1127 |
| 1128 WatcherThread::WatcherThread() : Thread() { | |
| 1129 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
| 1130 if (os::create_thread(this, os::watcher_thread)) { | |
| 1131 _watcher_thread = this; | |
| 1132 | |
| 1133 // Set the watcher thread to the highest OS priority which should not be | |
| 1134 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
| 1135 // is created. The only normal thread using this priority is the reference | |
| 1136 // handler thread, which runs for very short intervals only. | |
| 1137 // If the VMThread's priority is not lower than the WatcherThread profiling | |
| 1138 // will be inaccurate. | |
| 1139 os::set_priority(this, MaxPriority); | |
| 1140 if (!DisableStartThread) { | |
| 1141 os::start_thread(this); | |
| 1142 } | |
| 1143 } | |
| 1144 } | |
| 1145 | |
| 1146 void WatcherThread::run() { | |
| 1147 assert(this == watcher_thread(), "just checking"); | |
| 1148 | |
| 1149 this->record_stack_base_and_size(); | |
| 1150 this->initialize_thread_local_storage(); | |
| 1151 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1152 while(!_should_terminate) { | |
| 1153 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
| 1154 assert(watcher_thread() == this, "thread consistency check"); | |
| 1155 | |
| 1156 // Calculate how long it'll be until the next PeriodicTask work | |
| 1157 // should be done, and sleep that amount of time. | |
|
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1158 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1159 |
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1160 // we expect this to timeout - we only ever get unparked when |
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1161 // we should terminate |
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1162 { |
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1163 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1164 |
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1165 jlong prev_time = os::javaTimeNanos(); |
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1166 for (;;) { |
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1167 int res= _SleepEvent->park(time_to_wait); |
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1168 if (res == OS_TIMEOUT || _should_terminate) |
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1169 break; |
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1170 // spurious wakeup of some kind |
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1171 jlong now = os::javaTimeNanos(); |
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1172 time_to_wait -= (now - prev_time) / 1000000; |
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1173 if (time_to_wait <= 0) |
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1174 break; |
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1175 prev_time = now; |
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1176 } |
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1177 } |
| 0 | 1178 |
| 1179 if (is_error_reported()) { | |
| 1180 // A fatal error has happened, the error handler(VMError::report_and_die) | |
| 1181 // should abort JVM after creating an error log file. However in some | |
| 1182 // rare cases, the error handler itself might deadlock. Here we try to | |
| 1183 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
| 1184 // | |
| 1185 // This code is in WatcherThread because WatcherThread wakes up | |
| 1186 // periodically so the fatal error handler doesn't need to do anything; | |
| 1187 // also because the WatcherThread is less likely to crash than other | |
| 1188 // threads. | |
| 1189 | |
| 1190 for (;;) { | |
| 1191 if (!ShowMessageBoxOnError | |
| 1192 && (OnError == NULL || OnError[0] == '\0') | |
| 1193 && Arguments::abort_hook() == NULL) { | |
| 1194 os::sleep(this, 2 * 60 * 1000, false); | |
| 1195 fdStream err(defaultStream::output_fd()); | |
| 1196 err.print_raw_cr("# [ timer expired, abort... ]"); | |
| 1197 // skip atexit/vm_exit/vm_abort hooks | |
| 1198 os::die(); | |
| 1199 } | |
| 1200 | |
| 1201 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
| 1202 // ShowMessageBoxOnError when it is ready to abort. | |
| 1203 os::sleep(this, 5 * 1000, false); | |
| 1204 } | |
| 1205 } | |
| 1206 | |
| 1207 PeriodicTask::real_time_tick(time_to_wait); | |
| 1208 | |
| 1209 // If we have no more tasks left due to dynamic disenrollment, | |
| 1210 // shut down the thread since we don't currently support dynamic enrollment | |
| 1211 if (PeriodicTask::num_tasks() == 0) { | |
| 1212 _should_terminate = true; | |
| 1213 } | |
| 1214 } | |
| 1215 | |
| 1216 // Signal that it is terminated | |
| 1217 { | |
| 1218 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
| 1219 _watcher_thread = NULL; | |
| 1220 Terminator_lock->notify(); | |
| 1221 } | |
| 1222 | |
| 1223 // Thread destructor usually does this.. | |
| 1224 ThreadLocalStorage::set_thread(NULL); | |
| 1225 } | |
| 1226 | |
| 1227 void WatcherThread::start() { | |
| 1228 if (watcher_thread() == NULL) { | |
| 1229 _should_terminate = false; | |
| 1230 // Create the single instance of WatcherThread | |
| 1231 new WatcherThread(); | |
| 1232 } | |
| 1233 } | |
| 1234 | |
| 1235 void WatcherThread::stop() { | |
| 1236 // it is ok to take late safepoints here, if needed | |
| 1237 MutexLocker mu(Terminator_lock); | |
| 1238 _should_terminate = true; | |
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1239 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1240 |
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1241 Thread* watcher = watcher_thread(); |
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1242 if (watcher != NULL) |
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1243 watcher->_SleepEvent->unpark(); |
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1244 |
| 0 | 1245 while(watcher_thread() != NULL) { |
| 1246 // This wait should make safepoint checks, wait without a timeout, | |
| 1247 // and wait as a suspend-equivalent condition. | |
| 1248 // | |
| 1249 // Note: If the FlatProfiler is running, then this thread is waiting | |
| 1250 // for the WatcherThread to terminate and the WatcherThread, via the | |
| 1251 // FlatProfiler task, is waiting for the external suspend request on | |
| 1252 // this thread to complete. wait_for_ext_suspend_completion() will | |
| 1253 // eventually timeout, but that takes time. Making this wait a | |
| 1254 // suspend-equivalent condition solves that timeout problem. | |
| 1255 // | |
| 1256 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 1257 Mutex::_as_suspend_equivalent_flag); | |
| 1258 } | |
| 1259 } | |
| 1260 | |
| 1261 void WatcherThread::print_on(outputStream* st) const { | |
| 1262 st->print("\"%s\" ", name()); | |
| 1263 Thread::print_on(st); | |
| 1264 st->cr(); | |
| 1265 } | |
| 1266 | |
| 1267 // ======= JavaThread ======== | |
| 1268 | |
| 1269 // A JavaThread is a normal Java thread | |
| 1270 | |
| 1271 void JavaThread::initialize() { | |
| 1272 // Initialize fields | |
|
342
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1273 |
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1274 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1275 set_claimed_par_id(-1); |
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1276 |
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1277 _env = NULL; |
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1278 _buffer_blob = NULL; |
| 0 | 1279 set_saved_exception_pc(NULL); |
| 1280 set_threadObj(NULL); | |
| 1281 _anchor.clear(); | |
| 1282 set_entry_point(NULL); | |
| 1283 set_jni_functions(jni_functions()); | |
| 1284 set_callee_target(NULL); | |
| 1285 set_vm_result(NULL); | |
| 1286 set_vm_result_2(NULL); | |
| 1287 set_vframe_array_head(NULL); | |
| 1288 set_vframe_array_last(NULL); | |
| 1289 set_deferred_locals(NULL); | |
| 1290 set_deopt_mark(NULL); | |
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1291 set_deopt_nmethod(NULL); |
| 0 | 1292 clear_must_deopt_id(); |
| 1293 set_monitor_chunks(NULL); | |
| 1294 set_next(NULL); | |
| 1295 set_thread_state(_thread_new); | |
| 1296 _terminated = _not_terminated; | |
| 1297 _privileged_stack_top = NULL; | |
| 1298 _array_for_gc = NULL; | |
| 1299 _suspend_equivalent = false; | |
| 1300 _in_deopt_handler = 0; | |
| 1301 _doing_unsafe_access = false; | |
| 1302 _stack_guard_state = stack_guard_unused; | |
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1303 _graal_deopt_info = NULL; |
| 0 | 1304 _exception_oop = NULL; |
| 1305 _exception_pc = 0; | |
| 1306 _exception_handler_pc = 0; | |
| 1903 | 1307 _is_method_handle_return = 0; |
| 0 | 1308 _jvmti_thread_state= NULL; |
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1309 _should_post_on_exceptions_flag = JNI_FALSE; |
| 0 | 1310 _jvmti_get_loaded_classes_closure = NULL; |
| 1311 _interp_only_mode = 0; | |
| 1312 _special_runtime_exit_condition = _no_async_condition; | |
| 1313 _pending_async_exception = NULL; | |
| 1314 _is_compiling = false; | |
| 1315 _thread_stat = NULL; | |
| 1316 _thread_stat = new ThreadStatistics(); | |
| 1317 _blocked_on_compilation = false; | |
| 1318 _jni_active_critical = 0; | |
| 1319 _do_not_unlock_if_synchronized = false; | |
| 1320 _cached_monitor_info = NULL; | |
| 1321 _parker = Parker::Allocate(this) ; | |
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1322 _scanned_nmethod = NULL; |
| 0 | 1323 |
| 1324 #ifndef PRODUCT | |
| 1325 _jmp_ring_index = 0; | |
| 1326 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
| 1327 record_jump(NULL, NULL, NULL, 0); | |
| 1328 } | |
| 1329 #endif /* PRODUCT */ | |
| 1330 | |
| 1331 set_thread_profiler(NULL); | |
| 1332 if (FlatProfiler::is_active()) { | |
| 1333 // This is where we would decide to either give each thread it's own profiler | |
| 1334 // or use one global one from FlatProfiler, | |
| 1335 // or up to some count of the number of profiled threads, etc. | |
| 1336 ThreadProfiler* pp = new ThreadProfiler(); | |
| 1337 pp->engage(); | |
| 1338 set_thread_profiler(pp); | |
| 1339 } | |
| 1340 | |
| 1341 // Setup safepoint state info for this thread | |
| 1342 ThreadSafepointState::create(this); | |
| 1343 | |
| 1344 debug_only(_java_call_counter = 0); | |
| 1345 | |
| 1346 // JVMTI PopFrame support | |
| 1347 _popframe_condition = popframe_inactive; | |
| 1348 _popframe_preserved_args = NULL; | |
| 1349 _popframe_preserved_args_size = 0; | |
| 1350 | |
| 1351 pd_initialize(); | |
| 1352 } | |
| 1353 | |
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1354 #ifndef SERIALGC |
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1355 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1356 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1357 #endif // !SERIALGC |
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1358 |
| 4006 | 1359 JavaThread::JavaThread(bool is_attaching_via_jni) : |
|
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1360 Thread() |
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1361 #ifndef SERIALGC |
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1362 , _satb_mark_queue(&_satb_mark_queue_set), |
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1363 _dirty_card_queue(&_dirty_card_queue_set) |
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1364 #endif // !SERIALGC |
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1365 { |
| 0 | 1366 initialize(); |
| 4006 | 1367 if (is_attaching_via_jni) { |
| 1368 _jni_attach_state = _attaching_via_jni; | |
| 1369 } else { | |
| 1370 _jni_attach_state = _not_attaching_via_jni; | |
| 1371 } | |
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1372 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
| 0 | 1373 } |
| 1374 | |
| 1375 bool JavaThread::reguard_stack(address cur_sp) { | |
| 1376 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
| 1377 return true; // Stack already guarded or guard pages not needed. | |
| 1378 } | |
| 1379 | |
| 1380 if (register_stack_overflow()) { | |
| 1381 // For those architectures which have separate register and | |
| 1382 // memory stacks, we must check the register stack to see if | |
| 1383 // it has overflowed. | |
| 1384 return false; | |
| 1385 } | |
| 1386 | |
| 1387 // Java code never executes within the yellow zone: the latter is only | |
| 1388 // there to provoke an exception during stack banging. If java code | |
| 1389 // is executing there, either StackShadowPages should be larger, or | |
| 1390 // some exception code in c1, c2 or the interpreter isn't unwinding | |
| 1391 // when it should. | |
| 1392 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
| 1393 | |
| 1394 enable_stack_yellow_zone(); | |
| 1395 return true; | |
| 1396 } | |
| 1397 | |
| 1398 bool JavaThread::reguard_stack(void) { | |
| 1399 return reguard_stack(os::current_stack_pointer()); | |
| 1400 } | |
| 1401 | |
| 1402 | |
| 1403 void JavaThread::block_if_vm_exited() { | |
| 1404 if (_terminated == _vm_exited) { | |
| 1405 // _vm_exited is set at safepoint, and Threads_lock is never released | |
| 1406 // we will block here forever | |
| 1407 Threads_lock->lock_without_safepoint_check(); | |
| 1408 ShouldNotReachHere(); | |
| 1409 } | |
| 1410 } | |
| 1411 | |
| 1412 | |
| 1413 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 1414 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
| 1415 | |
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1416 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1417 Thread() |
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1418 #ifndef SERIALGC |
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1419 , _satb_mark_queue(&_satb_mark_queue_set), |
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1420 _dirty_card_queue(&_dirty_card_queue_set) |
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1421 #endif // !SERIALGC |
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1422 { |
| 0 | 1423 if (TraceThreadEvents) { |
| 1424 tty->print_cr("creating thread %p", this); | |
| 1425 } | |
| 1426 initialize(); | |
| 4006 | 1427 _jni_attach_state = _not_attaching_via_jni; |
| 0 | 1428 set_entry_point(entry_point); |
| 1429 // Create the native thread itself. | |
| 1430 // %note runtime_23 | |
| 1431 os::ThreadType thr_type = os::java_thread; | |
| 1432 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
| 1433 os::java_thread; | |
| 1434 os::create_thread(this, thr_type, stack_sz); | |
| 1435 | |
| 1436 // The _osthread may be NULL here because we ran out of memory (too many threads active). | |
| 1437 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
| 1438 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
| 1439 // the exception consists of creating the exception object & initializing it, initialization | |
| 1440 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
| 1441 // | |
| 1442 // The thread is still suspended when we reach here. Thread must be explicit started | |
| 1443 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
| 1444 // by calling Threads:add. The reason why this is not done here, is because the thread | |
| 1445 // object must be fully initialized (take a look at JVM_Start) | |
| 1446 } | |
| 1447 | |
| 1448 JavaThread::~JavaThread() { | |
| 1449 if (TraceThreadEvents) { | |
| 1450 tty->print_cr("terminate thread %p", this); | |
| 1451 } | |
| 1452 | |
| 1453 // JSR166 -- return the parker to the free list | |
| 1454 Parker::Release(_parker); | |
| 1455 _parker = NULL ; | |
| 1456 | |
| 1457 // Free any remaining previous UnrollBlock | |
| 1458 vframeArray* old_array = vframe_array_last(); | |
| 1459 | |
| 1460 if (old_array != NULL) { | |
| 1461 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
| 1462 old_array->set_unroll_block(NULL); | |
| 1463 delete old_info; | |
| 1464 delete old_array; | |
| 1465 } | |
| 1466 | |
| 1467 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
| 1468 if (deferred != NULL) { | |
| 1469 // This can only happen if thread is destroyed before deoptimization occurs. | |
| 1470 assert(deferred->length() != 0, "empty array!"); | |
| 1471 do { | |
| 1472 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
| 1473 deferred->remove_at(0); | |
| 1474 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 1475 delete dlv; | |
| 1476 } while (deferred->length() != 0); | |
| 1477 delete deferred; | |
| 1478 } | |
| 1479 | |
| 1480 // All Java related clean up happens in exit | |
| 1481 ThreadSafepointState::destroy(this); | |
| 1482 if (_thread_profiler != NULL) delete _thread_profiler; | |
| 1483 if (_thread_stat != NULL) delete _thread_stat; | |
| 1484 } | |
| 1485 | |
| 1486 | |
| 1487 // The first routine called by a new Java thread | |
| 1488 void JavaThread::run() { | |
| 1489 // initialize thread-local alloc buffer related fields | |
| 1490 this->initialize_tlab(); | |
| 1491 | |
| 1492 // used to test validitity of stack trace backs | |
| 1493 this->record_base_of_stack_pointer(); | |
| 1494 | |
| 1495 // Record real stack base and size. | |
| 1496 this->record_stack_base_and_size(); | |
| 1497 | |
| 1498 // Initialize thread local storage; set before calling MutexLocker | |
| 1499 this->initialize_thread_local_storage(); | |
| 1500 | |
| 1501 this->create_stack_guard_pages(); | |
| 1502 | |
|
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1503 this->cache_global_variables(); |
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1504 |
| 0 | 1505 // Thread is now sufficient initialized to be handled by the safepoint code as being |
| 1506 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
| 1507 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
| 1508 | |
| 1509 assert(JavaThread::current() == this, "sanity check"); | |
| 1510 assert(!Thread::current()->owns_locks(), "sanity check"); | |
| 1511 | |
| 1512 DTRACE_THREAD_PROBE(start, this); | |
| 1513 | |
| 1514 // This operation might block. We call that after all safepoint checks for a new thread has | |
| 1515 // been completed. | |
| 1516 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1517 | |
| 1518 if (JvmtiExport::should_post_thread_life()) { | |
| 1519 JvmtiExport::post_thread_start(this); | |
| 1520 } | |
| 1521 | |
| 1522 // We call another function to do the rest so we are sure that the stack addresses used | |
| 1523 // from there will be lower than the stack base just computed | |
| 1524 thread_main_inner(); | |
| 1525 | |
| 1526 // Note, thread is no longer valid at this point! | |
| 1527 } | |
| 1528 | |
| 1529 | |
| 1530 void JavaThread::thread_main_inner() { | |
| 1531 assert(JavaThread::current() == this, "sanity check"); | |
| 1532 assert(this->threadObj() != NULL, "just checking"); | |
| 1533 | |
|
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1534 // Execute thread entry point unless this thread has a pending exception |
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1535 // or has been stopped before starting. |
| 0 | 1536 // Note: Due to JVM_StopThread we can have pending exceptions already! |
|
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1537 if (!this->has_pending_exception() && |
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1538 !java_lang_Thread::is_stillborn(this->threadObj())) { |
| 4006 | 1539 { |
| 1540 ResourceMark rm(this); | |
| 1541 this->set_native_thread_name(this->get_thread_name()); | |
| 1542 } | |
| 0 | 1543 HandleMark hm(this); |
| 1544 this->entry_point()(this, this); | |
| 1545 } | |
| 1546 | |
| 1547 DTRACE_THREAD_PROBE(stop, this); | |
| 1548 | |
| 1549 this->exit(false); | |
| 1550 delete this; | |
| 1551 } | |
| 1552 | |
| 1553 | |
| 1554 static void ensure_join(JavaThread* thread) { | |
| 1555 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
| 1556 Handle threadObj(thread, thread->threadObj()); | |
| 1557 assert(threadObj.not_null(), "java thread object must exist"); | |
| 1558 ObjectLocker lock(threadObj, thread); | |
| 1559 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1560 thread->clear_pending_exception(); | |
| 1561 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
| 1562 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
|
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1563 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1564 // to complete once we've done the notify_all below |
| 0 | 1565 java_lang_Thread::set_thread(threadObj(), NULL); |
| 1566 lock.notify_all(thread); | |
| 1567 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1568 thread->clear_pending_exception(); | |
| 1569 } | |
| 1570 | |
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1571 |
| 0 | 1572 // For any new cleanup additions, please check to see if they need to be applied to |
| 1573 // cleanup_failed_attach_current_thread as well. | |
| 1574 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
| 1575 assert(this == JavaThread::current(), "thread consistency check"); | |
| 1576 if (!InitializeJavaLangSystem) return; | |
| 1577 | |
| 1578 HandleMark hm(this); | |
| 1579 Handle uncaught_exception(this, this->pending_exception()); | |
| 1580 this->clear_pending_exception(); | |
| 1581 Handle threadObj(this, this->threadObj()); | |
| 1582 assert(threadObj.not_null(), "Java thread object should be created"); | |
| 1583 | |
| 1584 if (get_thread_profiler() != NULL) { | |
| 1585 get_thread_profiler()->disengage(); | |
| 1586 ResourceMark rm; | |
| 1587 get_thread_profiler()->print(get_thread_name()); | |
| 1588 } | |
| 1589 | |
| 1590 | |
| 1591 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
| 1592 { | |
| 1593 EXCEPTION_MARK; | |
| 1594 | |
| 1595 CLEAR_PENDING_EXCEPTION; | |
| 1596 } | |
| 1597 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
| 1598 // has to be fixed by a runtime query method | |
| 1599 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
| 1600 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
| 1601 // java.lang.Thread.dispatchUncaughtException | |
| 1602 if (uncaught_exception.not_null()) { | |
| 1603 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
| 1604 Events::log("uncaught exception INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT", | |
| 1605 (address)uncaught_exception(), (address)threadObj(), (address)group()); | |
| 1606 { | |
| 1607 EXCEPTION_MARK; | |
| 1608 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
| 1609 // call it. Otherwise we have an older library without the JSR-166 changes, | |
| 1610 // so call ThreadGroup.uncaughtException() | |
| 1611 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
| 1612 CallInfo callinfo; | |
| 1142 | 1613 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1614 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
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1615 vmSymbols::dispatchUncaughtException_name(), |
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1616 vmSymbols::throwable_void_signature(), |
| 0 | 1617 KlassHandle(), false, false, THREAD); |
| 1618 CLEAR_PENDING_EXCEPTION; | |
| 1619 methodHandle method = callinfo.selected_method(); | |
| 1620 if (method.not_null()) { | |
| 1621 JavaValue result(T_VOID); | |
| 1622 JavaCalls::call_virtual(&result, | |
| 1623 threadObj, thread_klass, | |
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1624 vmSymbols::dispatchUncaughtException_name(), |
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1625 vmSymbols::throwable_void_signature(), |
| 0 | 1626 uncaught_exception, |
| 1627 THREAD); | |
| 1628 } else { | |
| 1142 | 1629 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1630 JavaValue result(T_VOID); |
| 1631 JavaCalls::call_virtual(&result, | |
| 1632 group, thread_group, | |
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1633 vmSymbols::uncaughtException_name(), |
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1634 vmSymbols::thread_throwable_void_signature(), |
| 0 | 1635 threadObj, // Arg 1 |
| 1636 uncaught_exception, // Arg 2 | |
| 1637 THREAD); | |
| 1638 } | |
|
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1639 if (HAS_PENDING_EXCEPTION) { |
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1640 ResourceMark rm(this); |
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1641 jio_fprintf(defaultStream::error_stream(), |
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1642 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1643 " in thread \"%s\"\n", |
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1644 Klass::cast(pending_exception()->klass())->external_name(), |
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1645 get_thread_name()); |
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1646 CLEAR_PENDING_EXCEPTION; |
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1647 } |
| 0 | 1648 } |
| 1649 } | |
| 1650 | |
| 1651 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during | |
| 1652 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
| 1653 // is deprecated anyhow. | |
| 1654 { int count = 3; | |
| 1655 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
| 1656 EXCEPTION_MARK; | |
| 1657 JavaValue result(T_VOID); | |
| 1142 | 1658 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1659 JavaCalls::call_virtual(&result, |
| 1660 threadObj, thread_klass, | |
|
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1661 vmSymbols::exit_method_name(), |
|
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1662 vmSymbols::void_method_signature(), |
| 0 | 1663 THREAD); |
| 1664 CLEAR_PENDING_EXCEPTION; | |
| 1665 } | |
| 1666 } | |
| 1667 | |
| 1668 // notify JVMTI | |
| 1669 if (JvmtiExport::should_post_thread_life()) { | |
| 1670 JvmtiExport::post_thread_end(this); | |
| 1671 } | |
| 1672 | |
| 1673 // We have notified the agents that we are exiting, before we go on, | |
| 1674 // we must check for a pending external suspend request and honor it | |
| 1675 // in order to not surprise the thread that made the suspend request. | |
| 1676 while (true) { | |
| 1677 { | |
| 1678 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1679 if (!is_external_suspend()) { | |
| 1680 set_terminated(_thread_exiting); | |
| 1681 ThreadService::current_thread_exiting(this); | |
| 1682 break; | |
| 1683 } | |
| 1684 // Implied else: | |
| 1685 // Things get a little tricky here. We have a pending external | |
| 1686 // suspend request, but we are holding the SR_lock so we | |
| 1687 // can't just self-suspend. So we temporarily drop the lock | |
| 1688 // and then self-suspend. | |
| 1689 } | |
| 1690 | |
| 1691 ThreadBlockInVM tbivm(this); | |
| 1692 java_suspend_self(); | |
| 1693 | |
| 1694 // We're done with this suspend request, but we have to loop around | |
| 1695 // and check again. Eventually we will get SR_lock without a pending | |
| 1696 // external suspend request and will be able to mark ourselves as | |
| 1697 // exiting. | |
| 1698 } | |
| 1699 // no more external suspends are allowed at this point | |
| 1700 } else { | |
| 1701 // before_exit() has already posted JVMTI THREAD_END events | |
| 1702 } | |
| 1703 | |
| 1704 // Notify waiters on thread object. This has to be done after exit() is called | |
| 1705 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
| 1706 // group should have the destroyed bit set before waiters are notified). | |
| 1707 ensure_join(this); | |
| 1708 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
| 1709 | |
| 1710 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
| 1711 // held by this thread must be released. A detach operation must only | |
| 1712 // get here if there are no Java frames on the stack. Therefore, any | |
| 1713 // owned monitors at this point MUST be JNI-acquired monitors which are | |
| 1714 // pre-inflated and in the monitor cache. | |
| 1715 // | |
| 1716 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
| 1717 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
| 1718 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
| 1719 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
| 1720 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
| 1721 } | |
| 1722 | |
| 1723 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
| 1724 // is in a consistent state, in case GC happens | |
| 1725 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
| 1726 | |
| 1727 if (active_handles() != NULL) { | |
| 1728 JNIHandleBlock* block = active_handles(); | |
| 1729 set_active_handles(NULL); | |
| 1730 JNIHandleBlock::release_block(block); | |
| 1731 } | |
| 1732 | |
| 1733 if (free_handle_block() != NULL) { | |
| 1734 JNIHandleBlock* block = free_handle_block(); | |
| 1735 set_free_handle_block(NULL); | |
| 1736 JNIHandleBlock::release_block(block); | |
| 1737 } | |
| 1738 | |
| 1739 // These have to be removed while this is still a valid thread. | |
| 1740 remove_stack_guard_pages(); | |
| 1741 | |
| 1742 if (UseTLAB) { | |
| 1743 tlab().make_parsable(true); // retire TLAB | |
| 1744 } | |
| 1745 | |
|
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1746 if (JvmtiEnv::environments_might_exist()) { |
|
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1747 JvmtiExport::cleanup_thread(this); |
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1748 } |
|
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1749 |
|
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1750 #ifndef SERIALGC |
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1751 // We must flush G1-related buffers before removing a thread from |
|
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1752 // the list of active threads. |
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1753 if (UseG1GC) { |
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1754 flush_barrier_queues(); |
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1755 } |
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1756 #endif |
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1757 |
| 0 | 1758 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
| 1759 Threads::remove(this); | |
| 1760 } | |
| 1761 | |
|
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1762 #ifndef SERIALGC |
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1763 // Flush G1-related queues. |
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1764 void JavaThread::flush_barrier_queues() { |
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1765 satb_mark_queue().flush(); |
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1766 dirty_card_queue().flush(); |
|
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1767 } |
|
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1768 |
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1769 void JavaThread::initialize_queues() { |
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1770 assert(!SafepointSynchronize::is_at_safepoint(), |
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1771 "we should not be at a safepoint"); |
|
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1772 |
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1773 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1774 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1775 // The SATB queue should have been constructed with its active |
|
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1776 // field set to false. |
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1777 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
|
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|
1778 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
|
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1779 // If we are creating the thread during a marking cycle, we should |
|
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1780 // set the active field of the SATB queue to true. |
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1781 if (satb_queue_set.is_active()) { |
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|
1782 satb_queue.set_active(true); |
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1783 } |
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1784 |
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|
1785 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
|
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1786 // The dirty card queue should have been constructed with its |
|
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1787 // active field set to true. |
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1788 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
|
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1789 } |
|
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1790 #endif // !SERIALGC |
|
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1791 |
| 0 | 1792 void JavaThread::cleanup_failed_attach_current_thread() { |
|
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1793 if (get_thread_profiler() != NULL) { |
|
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1794 get_thread_profiler()->disengage(); |
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1795 ResourceMark rm; |
|
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1796 get_thread_profiler()->print(get_thread_name()); |
|
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1797 } |
|
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1798 |
|
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1799 if (active_handles() != NULL) { |
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1800 JNIHandleBlock* block = active_handles(); |
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1801 set_active_handles(NULL); |
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1802 JNIHandleBlock::release_block(block); |
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1803 } |
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1804 |
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1805 if (free_handle_block() != NULL) { |
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1806 JNIHandleBlock* block = free_handle_block(); |
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1807 set_free_handle_block(NULL); |
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1808 JNIHandleBlock::release_block(block); |
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1809 } |
|
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1810 |
|
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1811 // These have to be removed while this is still a valid thread. |
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1812 remove_stack_guard_pages(); |
|
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1813 |
|
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1814 if (UseTLAB) { |
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1815 tlab().make_parsable(true); // retire TLAB, if any |
|
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1816 } |
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1817 |
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1818 #ifndef SERIALGC |
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1819 if (UseG1GC) { |
|
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1820 flush_barrier_queues(); |
|
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1821 } |
|
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1822 #endif |
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1823 |
|
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|
1824 Threads::remove(this); |
|
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|
1825 delete this; |
| 0 | 1826 } |
| 1827 | |
| 1828 | |
|
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1829 |
|
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1830 |
| 0 | 1831 JavaThread* JavaThread::active() { |
| 1832 Thread* thread = ThreadLocalStorage::thread(); | |
| 1833 assert(thread != NULL, "just checking"); | |
| 1834 if (thread->is_Java_thread()) { | |
| 1835 return (JavaThread*) thread; | |
| 1836 } else { | |
| 1837 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
| 1838 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
| 1839 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
| 1840 assert(ret->is_Java_thread(), "must be a Java thread"); | |
| 1841 return ret; | |
| 1842 } | |
| 1843 } | |
| 1844 | |
| 1845 bool JavaThread::is_lock_owned(address adr) const { | |
|
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1846 if (Thread::is_lock_owned(adr)) return true; |
| 0 | 1847 |
| 1848 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 1849 if (chunk->contains(adr)) return true; | |
| 1850 } | |
| 1851 | |
| 1852 return false; | |
| 1853 } | |
| 1854 | |
| 1855 | |
| 1856 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
| 1857 chunk->set_next(monitor_chunks()); | |
| 1858 set_monitor_chunks(chunk); | |
| 1859 } | |
| 1860 | |
| 1861 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
| 1862 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
| 1863 if (monitor_chunks() == chunk) { | |
| 1864 set_monitor_chunks(chunk->next()); | |
| 1865 } else { | |
| 1866 MonitorChunk* prev = monitor_chunks(); | |
| 1867 while (prev->next() != chunk) prev = prev->next(); | |
| 1868 prev->set_next(chunk->next()); | |
| 1869 } | |
| 1870 } | |
| 1871 | |
| 1872 // JVM support. | |
| 1873 | |
| 1874 // Note: this function shouldn't block if it's called in | |
| 1875 // _thread_in_native_trans state (such as from | |
| 1876 // check_special_condition_for_native_trans()). | |
| 1877 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
| 1878 | |
| 1879 if (has_last_Java_frame() && has_async_condition()) { | |
| 1880 // If we are at a polling page safepoint (not a poll return) | |
| 1881 // then we must defer async exception because live registers | |
| 1882 // will be clobbered by the exception path. Poll return is | |
| 1883 // ok because the call we a returning from already collides | |
| 1884 // with exception handling registers and so there is no issue. | |
| 1885 // (The exception handling path kills call result registers but | |
| 1886 // this is ok since the exception kills the result anyway). | |
| 1887 | |
| 1888 if (is_at_poll_safepoint()) { | |
| 1889 // if the code we are returning to has deoptimized we must defer | |
| 1890 // the exception otherwise live registers get clobbered on the | |
| 1891 // exception path before deoptimization is able to retrieve them. | |
| 1892 // | |
| 1893 RegisterMap map(this, false); | |
| 1894 frame caller_fr = last_frame().sender(&map); | |
| 1895 assert(caller_fr.is_compiled_frame(), "what?"); | |
| 1896 if (caller_fr.is_deoptimized_frame()) { | |
| 1897 if (TraceExceptions) { | |
| 1898 ResourceMark rm; | |
| 1899 tty->print_cr("deferred async exception at compiled safepoint"); | |
| 1900 } | |
| 1901 return; | |
| 1902 } | |
| 1903 } | |
| 1904 } | |
| 1905 | |
| 1906 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
| 1907 if (condition == _no_async_condition) { | |
| 1908 // Conditions have changed since has_special_runtime_exit_condition() | |
| 1909 // was called: | |
| 1910 // - if we were here only because of an external suspend request, | |
| 1911 // then that was taken care of above (or cancelled) so we are done | |
| 1912 // - if we were here because of another async request, then it has | |
| 1913 // been cleared between the has_special_runtime_exit_condition() | |
| 1914 // and now so again we are done | |
| 1915 return; | |
| 1916 } | |
| 1917 | |
| 1918 // Check for pending async. exception | |
| 1919 if (_pending_async_exception != NULL) { | |
| 1920 // Only overwrite an already pending exception, if it is not a threadDeath. | |
| 1142 | 1921 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 1922 |
| 1923 // We cannot call Exceptions::_throw(...) here because we cannot block | |
| 1924 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
| 1925 | |
| 1926 if (TraceExceptions) { | |
| 1927 ResourceMark rm; | |
| 1928 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
| 1929 if (has_last_Java_frame() ) { | |
| 1930 frame f = last_frame(); | |
| 1931 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
| 1932 } | |
| 1933 tty->print_cr(" of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
| 1934 } | |
| 1935 _pending_async_exception = NULL; | |
| 1936 clear_has_async_exception(); | |
| 1937 } | |
| 1938 } | |
| 1939 | |
| 1940 if (check_unsafe_error && | |
| 1941 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
| 1942 condition = _no_async_condition; // done | |
| 1943 switch (thread_state()) { | |
| 1944 case _thread_in_vm: | |
| 1945 { | |
| 1946 JavaThread* THREAD = this; | |
| 1947 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 1948 } | |
| 1949 case _thread_in_native: | |
| 1950 { | |
| 1951 ThreadInVMfromNative tiv(this); | |
| 1952 JavaThread* THREAD = this; | |
| 1953 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 1954 } | |
| 1955 case _thread_in_Java: | |
| 1956 { | |
| 1957 ThreadInVMfromJava tiv(this); | |
| 1958 JavaThread* THREAD = this; | |
| 1959 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
| 1960 } | |
| 1961 default: | |
| 1962 ShouldNotReachHere(); | |
| 1963 } | |
| 1964 } | |
| 1965 | |
| 1966 assert(condition == _no_async_condition || has_pending_exception() || | |
| 1967 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
| 1968 "must have handled the async condition, if no exception"); | |
| 1969 } | |
| 1970 | |
| 1971 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
| 1972 // | |
| 1973 // Check for pending external suspend. Internal suspend requests do | |
| 1974 // not use handle_special_runtime_exit_condition(). | |
| 1975 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 1976 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 1977 // threads could call into the VM with another thread's JNIEnv so we | |
| 1978 // can be here operating on behalf of a suspended thread (4432884). | |
| 1979 bool do_self_suspend = is_external_suspend_with_lock(); | |
| 1980 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
| 1981 // | |
| 1982 // Because thread is external suspended the safepoint code will count | |
| 1983 // thread as at a safepoint. This can be odd because we can be here | |
| 1984 // as _thread_in_Java which would normally transition to _thread_blocked | |
| 1985 // at a safepoint. We would like to mark the thread as _thread_blocked | |
| 1986 // before calling java_suspend_self like all other callers of it but | |
| 1987 // we must then observe proper safepoint protocol. (We can't leave | |
| 1988 // _thread_blocked with a safepoint in progress). However we can be | |
| 1989 // here as _thread_in_native_trans so we can't use a normal transition | |
| 1990 // constructor/destructor pair because they assert on that type of | |
| 1991 // transition. We could do something like: | |
| 1992 // | |
| 1993 // JavaThreadState state = thread_state(); | |
| 1994 // set_thread_state(_thread_in_vm); | |
| 1995 // { | |
| 1996 // ThreadBlockInVM tbivm(this); | |
| 1997 // java_suspend_self() | |
| 1998 // } | |
| 1999 // set_thread_state(_thread_in_vm_trans); | |
| 2000 // if (safepoint) block; | |
| 2001 // set_thread_state(state); | |
| 2002 // | |
| 2003 // but that is pretty messy. Instead we just go with the way the | |
| 2004 // code has worked before and note that this is the only path to | |
| 2005 // java_suspend_self that doesn't put the thread in _thread_blocked | |
| 2006 // mode. | |
| 2007 | |
| 2008 frame_anchor()->make_walkable(this); | |
| 2009 java_suspend_self(); | |
| 2010 | |
| 2011 // We might be here for reasons in addition to the self-suspend request | |
| 2012 // so check for other async requests. | |
| 2013 } | |
| 2014 | |
| 2015 if (check_asyncs) { | |
| 2016 check_and_handle_async_exceptions(); | |
| 2017 } | |
| 2018 } | |
| 2019 | |
| 2020 void JavaThread::send_thread_stop(oop java_throwable) { | |
| 2021 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
| 2022 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
| 2023 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 2024 | |
| 2025 // Do not throw asynchronous exceptions against the compiler thread | |
| 2026 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
|
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|
2027 |
|
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|
2028 // (tw) May we do this? |
|
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diff
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|
2029 //if (is_Compiler_thread()) return; |
| 0 | 2030 |
| 2031 { | |
| 2032 // Actually throw the Throwable against the target Thread - however | |
| 2033 // only if there is no thread death exception installed already. | |
| 1142 | 2034 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2035 // If the topmost frame is a runtime stub, then we are calling into |
| 2036 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
| 2037 // must deoptimize the caller before continuing, as the compiled exception handler table | |
| 2038 // may not be valid | |
| 2039 if (has_last_Java_frame()) { | |
| 2040 frame f = last_frame(); | |
| 2041 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
| 2042 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2043 RegisterMap reg_map(this, UseBiasedLocking); | |
| 2044 frame compiled_frame = f.sender(®_map); | |
| 2045 if (compiled_frame.can_be_deoptimized()) { | |
| 2046 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
| 2047 } | |
| 2048 } | |
| 2049 } | |
| 2050 | |
| 2051 // Set async. pending exception in thread. | |
| 2052 set_pending_async_exception(java_throwable); | |
| 2053 | |
| 2054 if (TraceExceptions) { | |
| 2055 ResourceMark rm; | |
| 2056 tty->print_cr("Pending Async. exception installed of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
| 2057 } | |
| 2058 // for AbortVMOnException flag | |
| 2059 NOT_PRODUCT(Exceptions::debug_check_abort(instanceKlass::cast(_pending_async_exception->klass())->external_name())); | |
| 2060 } | |
| 2061 } | |
| 2062 | |
| 2063 | |
| 2064 // Interrupt thread so it will wake up from a potential wait() | |
| 2065 Thread::interrupt(this); | |
| 2066 } | |
| 2067 | |
| 2068 // External suspension mechanism. | |
| 2069 // | |
| 2070 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
| 2071 // to any VM_locks and it is at a transition | |
| 2072 // Self-suspension will happen on the transition out of the vm. | |
| 2073 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
| 2074 // | |
| 2075 // Guarantees on return: | |
| 2076 // + Target thread will not execute any new bytecode (that's why we need to | |
| 2077 // force a safepoint) | |
| 2078 // + Target thread will not enter any new monitors | |
| 2079 // | |
| 2080 void JavaThread::java_suspend() { | |
| 2081 { MutexLocker mu(Threads_lock); | |
| 2082 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
| 2083 return; | |
| 2084 } | |
| 2085 } | |
| 2086 | |
| 2087 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2088 if (!is_external_suspend()) { | |
| 2089 // a racing resume has cancelled us; bail out now | |
| 2090 return; | |
| 2091 } | |
| 2092 | |
| 2093 // suspend is done | |
| 2094 uint32_t debug_bits = 0; | |
| 2095 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 2096 // SR_lock to allow the thread to reach a stable thread state if | |
| 2097 // it is currently in a transient thread state. | |
| 2098 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
| 2099 SuspendRetryDelay, &debug_bits) ) { | |
| 2100 return; | |
| 2101 } | |
| 2102 } | |
| 2103 | |
| 2104 VM_ForceSafepoint vm_suspend; | |
| 2105 VMThread::execute(&vm_suspend); | |
| 2106 } | |
| 2107 | |
| 2108 // Part II of external suspension. | |
| 2109 // A JavaThread self suspends when it detects a pending external suspend | |
| 2110 // request. This is usually on transitions. It is also done in places | |
| 2111 // where continuing to the next transition would surprise the caller, | |
| 2112 // e.g., monitor entry. | |
| 2113 // | |
| 2114 // Returns the number of times that the thread self-suspended. | |
| 2115 // | |
| 2116 // Note: DO NOT call java_suspend_self() when you just want to block current | |
| 2117 // thread. java_suspend_self() is the second stage of cooperative | |
| 2118 // suspension for external suspend requests and should only be used | |
| 2119 // to complete an external suspend request. | |
| 2120 // | |
| 2121 int JavaThread::java_suspend_self() { | |
| 2122 int ret = 0; | |
| 2123 | |
| 2124 // we are in the process of exiting so don't suspend | |
| 2125 if (is_exiting()) { | |
| 2126 clear_external_suspend(); | |
| 2127 return ret; | |
| 2128 } | |
| 2129 | |
| 2130 assert(_anchor.walkable() || | |
| 2131 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
| 2132 "must have walkable stack"); | |
| 2133 | |
| 2134 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2135 | |
| 979 | 2136 assert(!this->is_ext_suspended(), |
| 0 | 2137 "a thread trying to self-suspend should not already be suspended"); |
| 2138 | |
| 2139 if (this->is_suspend_equivalent()) { | |
| 2140 // If we are self-suspending as a result of the lifting of a | |
| 2141 // suspend equivalent condition, then the suspend_equivalent | |
| 2142 // flag is not cleared until we set the ext_suspended flag so | |
| 2143 // that wait_for_ext_suspend_completion() returns consistent | |
| 2144 // results. | |
| 2145 this->clear_suspend_equivalent(); | |
| 2146 } | |
| 2147 | |
| 2148 // A racing resume may have cancelled us before we grabbed SR_lock | |
| 2149 // above. Or another external suspend request could be waiting for us | |
| 2150 // by the time we return from SR_lock()->wait(). The thread | |
| 2151 // that requested the suspension may already be trying to walk our | |
| 2152 // stack and if we return now, we can change the stack out from under | |
| 2153 // it. This would be a "bad thing (TM)" and cause the stack walker | |
| 2154 // to crash. We stay self-suspended until there are no more pending | |
| 2155 // external suspend requests. | |
| 2156 while (is_external_suspend()) { | |
| 2157 ret++; | |
| 2158 this->set_ext_suspended(); | |
| 2159 | |
| 2160 // _ext_suspended flag is cleared by java_resume() | |
| 2161 while (is_ext_suspended()) { | |
| 2162 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
| 2163 } | |
| 2164 } | |
| 2165 | |
| 2166 return ret; | |
| 2167 } | |
| 2168 | |
| 2169 #ifdef ASSERT | |
| 2170 // verify the JavaThread has not yet been published in the Threads::list, and | |
| 2171 // hence doesn't need protection from concurrent access at this stage | |
| 2172 void JavaThread::verify_not_published() { | |
| 2173 if (!Threads_lock->owned_by_self()) { | |
| 2174 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
| 2175 assert( !Threads::includes(this), | |
| 2176 "java thread shouldn't have been published yet!"); | |
| 2177 } | |
| 2178 else { | |
| 2179 assert( !Threads::includes(this), | |
| 2180 "java thread shouldn't have been published yet!"); | |
| 2181 } | |
| 2182 } | |
| 2183 #endif | |
| 2184 | |
| 2185 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2186 // progress or when _suspend_flags is non-zero. | |
| 2187 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2188 // block if a safepoint is in progress. | |
| 2189 // Async exception ISN'T checked. | |
| 2190 // Note only the ThreadInVMfromNative transition can call this function | |
| 2191 // directly and when thread state is _thread_in_native_trans | |
| 2192 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
| 2193 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
| 2194 | |
| 2195 JavaThread *curJT = JavaThread::current(); | |
| 2196 bool do_self_suspend = thread->is_external_suspend(); | |
| 2197 | |
| 2198 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
| 2199 | |
| 2200 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2201 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2202 // threads could call into the VM with another thread's JNIEnv so we | |
| 2203 // can be here operating on behalf of a suspended thread (4432884). | |
| 2204 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
| 2205 JavaThreadState state = thread->thread_state(); | |
| 2206 | |
| 2207 // We mark this thread_blocked state as a suspend-equivalent so | |
| 2208 // that a caller to is_ext_suspend_completed() won't be confused. | |
| 2209 // The suspend-equivalent state is cleared by java_suspend_self(). | |
| 2210 thread->set_suspend_equivalent(); | |
| 2211 | |
| 2212 // If the safepoint code sees the _thread_in_native_trans state, it will | |
| 2213 // wait until the thread changes to other thread state. There is no | |
| 2214 // guarantee on how soon we can obtain the SR_lock and complete the | |
| 2215 // self-suspend request. It would be a bad idea to let safepoint wait for | |
| 2216 // too long. Temporarily change the state to _thread_blocked to | |
| 2217 // let the VM thread know that this thread is ready for GC. The problem | |
| 2218 // of changing thread state is that safepoint could happen just after | |
| 2219 // java_suspend_self() returns after being resumed, and VM thread will | |
| 2220 // see the _thread_blocked state. We must check for safepoint | |
| 2221 // after restoring the state and make sure we won't leave while a safepoint | |
| 2222 // is in progress. | |
| 2223 thread->set_thread_state(_thread_blocked); | |
| 2224 thread->java_suspend_self(); | |
| 2225 thread->set_thread_state(state); | |
| 2226 // Make sure new state is seen by VM thread | |
| 2227 if (os::is_MP()) { | |
| 2228 if (UseMembar) { | |
| 2229 // Force a fence between the write above and read below | |
| 2230 OrderAccess::fence(); | |
| 2231 } else { | |
| 2232 // Must use this rather than serialization page in particular on Windows | |
| 2233 InterfaceSupport::serialize_memory(thread); | |
| 2234 } | |
| 2235 } | |
| 2236 } | |
| 2237 | |
| 2238 if (SafepointSynchronize::do_call_back()) { | |
| 2239 // If we are safepointing, then block the caller which may not be | |
| 2240 // the same as the target thread (see above). | |
| 2241 SafepointSynchronize::block(curJT); | |
| 2242 } | |
| 2243 | |
| 2244 if (thread->is_deopt_suspend()) { | |
| 2245 thread->clear_deopt_suspend(); | |
| 2246 RegisterMap map(thread, false); | |
| 2247 frame f = thread->last_frame(); | |
| 2248 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
| 2249 f = f.sender(&map); | |
| 2250 } | |
| 2251 if (f.id() == thread->must_deopt_id()) { | |
| 2252 thread->clear_must_deopt_id(); | |
|
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diff
changeset
|
2253 f.deoptimize(thread); |
| 0 | 2254 } else { |
| 2255 fatal("missed deoptimization!"); | |
| 2256 } | |
| 2257 } | |
| 2258 } | |
| 2259 | |
| 2260 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2261 // progress or when _suspend_flags is non-zero. | |
| 2262 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2263 // block if a safepoint is in progress. | |
| 2264 // Also check for pending async exception (not including unsafe access error). | |
| 2265 // Note only the native==>VM/Java barriers can call this function and when | |
| 2266 // thread state is _thread_in_native_trans. | |
| 2267 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
| 2268 check_safepoint_and_suspend_for_native_trans(thread); | |
| 2269 | |
| 2270 if (thread->has_async_exception()) { | |
| 2271 // We are in _thread_in_native_trans state, don't handle unsafe | |
| 2272 // access error since that may block. | |
| 2273 thread->check_and_handle_async_exceptions(false); | |
| 2274 } | |
| 2275 } | |
| 2276 | |
| 2277 // We need to guarantee the Threads_lock here, since resumes are not | |
| 2278 // allowed during safepoint synchronization | |
| 2279 // Can only resume from an external suspension | |
| 2280 void JavaThread::java_resume() { | |
| 2281 assert_locked_or_safepoint(Threads_lock); | |
| 2282 | |
| 2283 // Sanity check: thread is gone, has started exiting or the thread | |
| 2284 // was not externally suspended. | |
| 2285 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
| 2286 return; | |
| 2287 } | |
| 2288 | |
| 2289 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2290 | |
| 2291 clear_external_suspend(); | |
| 2292 | |
| 2293 if (is_ext_suspended()) { | |
| 2294 clear_ext_suspended(); | |
| 2295 SR_lock()->notify_all(); | |
| 2296 } | |
| 2297 } | |
| 2298 | |
| 2299 void JavaThread::create_stack_guard_pages() { | |
| 2300 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
| 2301 address low_addr = stack_base() - stack_size(); | |
| 2302 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2303 | |
| 2304 int allocate = os::allocate_stack_guard_pages(); | |
| 2305 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
| 2306 | |
|
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diff
changeset
|
2307 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2308 warning("Attempt to allocate stack guard pages failed."); |
| 2309 return; | |
| 2310 } | |
| 2311 | |
| 2312 if (os::guard_memory((char *) low_addr, len)) { | |
| 2313 _stack_guard_state = stack_guard_enabled; | |
| 2314 } else { | |
| 2315 warning("Attempt to protect stack guard pages failed."); | |
| 2316 if (os::uncommit_memory((char *) low_addr, len)) { | |
| 2317 warning("Attempt to deallocate stack guard pages failed."); | |
| 2318 } | |
| 2319 } | |
| 2320 } | |
| 2321 | |
| 2322 void JavaThread::remove_stack_guard_pages() { | |
| 2323 if (_stack_guard_state == stack_guard_unused) return; | |
| 2324 address low_addr = stack_base() - stack_size(); | |
| 2325 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2326 | |
| 2327 if (os::allocate_stack_guard_pages()) { | |
|
1320
3b3d12e645e7
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coleenp
parents:
1290
diff
changeset
|
2328 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2329 _stack_guard_state = stack_guard_unused; |
| 2330 } else { | |
| 2331 warning("Attempt to deallocate stack guard pages failed."); | |
| 2332 } | |
| 2333 } else { | |
| 2334 if (_stack_guard_state == stack_guard_unused) return; | |
| 2335 if (os::unguard_memory((char *) low_addr, len)) { | |
| 2336 _stack_guard_state = stack_guard_unused; | |
| 2337 } else { | |
| 2338 warning("Attempt to unprotect stack guard pages failed."); | |
| 2339 } | |
| 2340 } | |
| 2341 } | |
| 2342 | |
| 2343 void JavaThread::enable_stack_yellow_zone() { | |
| 2344 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2345 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
| 2346 | |
| 2347 // The base notation is from the stacks point of view, growing downward. | |
| 2348 // We need to adjust it to work correctly with guard_memory() | |
| 2349 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2350 | |
| 2351 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
| 2352 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
| 2353 | |
| 2354 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
| 2355 _stack_guard_state = stack_guard_enabled; | |
| 2356 } else { | |
| 2357 warning("Attempt to guard stack yellow zone failed."); | |
| 2358 } | |
| 2359 enable_register_stack_guard(); | |
| 2360 } | |
| 2361 | |
| 2362 void JavaThread::disable_stack_yellow_zone() { | |
| 2363 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2364 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
| 2365 | |
| 2366 // Simply return if called for a thread that does not use guard pages. | |
| 2367 if (_stack_guard_state == stack_guard_unused) return; | |
| 2368 | |
| 2369 // The base notation is from the stacks point of view, growing downward. | |
| 2370 // We need to adjust it to work correctly with guard_memory() | |
| 2371 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2372 | |
| 2373 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
| 2374 _stack_guard_state = stack_guard_yellow_disabled; | |
| 2375 } else { | |
| 2376 warning("Attempt to unguard stack yellow zone failed."); | |
| 2377 } | |
| 2378 disable_register_stack_guard(); | |
| 2379 } | |
| 2380 | |
| 2381 void JavaThread::enable_stack_red_zone() { | |
| 2382 // The base notation is from the stacks point of view, growing downward. | |
| 2383 // We need to adjust it to work correctly with guard_memory() | |
| 2384 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2385 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2386 | |
| 2387 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
| 2388 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
| 2389 | |
| 2390 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
| 2391 warning("Attempt to guard stack red zone failed."); | |
| 2392 } | |
| 2393 } | |
| 2394 | |
| 2395 void JavaThread::disable_stack_red_zone() { | |
| 2396 // The base notation is from the stacks point of view, growing downward. | |
| 2397 // We need to adjust it to work correctly with guard_memory() | |
| 2398 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2399 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2400 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
| 2401 warning("Attempt to unguard stack red zone failed."); | |
| 2402 } | |
| 2403 } | |
| 2404 | |
| 2405 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
| 2406 // ignore is there is no stack | |
| 2407 if (!has_last_Java_frame()) return; | |
| 2408 // traverse the stack frames. Starts from top frame. | |
| 2409 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2410 frame* fr = fst.current(); | |
| 2411 f(fr, fst.register_map()); | |
| 2412 } | |
| 2413 } | |
| 2414 | |
| 2415 | |
| 2416 #ifndef PRODUCT | |
| 2417 // Deoptimization | |
| 2418 // Function for testing deoptimization | |
| 2419 void JavaThread::deoptimize() { | |
| 2420 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2421 StackFrameStream fst(this, UseBiasedLocking); | |
| 2422 bool deopt = false; // Dump stack only if a deopt actually happens. | |
| 2423 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
| 2424 // Iterate over all frames in the thread and deoptimize | |
| 2425 for(; !fst.is_done(); fst.next()) { | |
| 2426 if(fst.current()->can_be_deoptimized()) { | |
| 2427 | |
| 2428 if (only_at) { | |
| 2429 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
| 2430 // consists of comma or carriage return separated numbers so | |
| 2431 // search for the current bci in that string. | |
| 2432 address pc = fst.current()->pc(); | |
| 2433 nmethod* nm = (nmethod*) fst.current()->cb(); | |
| 2434 ScopeDesc* sd = nm->scope_desc_at( pc); | |
| 2435 char buffer[8]; | |
| 2436 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
| 2437 size_t len = strlen(buffer); | |
| 2438 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
| 2439 while (found != NULL) { | |
| 2440 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
| 2441 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
| 2442 // Check that the bci found is bracketed by terminators. | |
| 2443 break; | |
| 2444 } | |
| 2445 found = strstr(found + 1, buffer); | |
| 2446 } | |
| 2447 if (!found) { | |
| 2448 continue; | |
| 2449 } | |
| 2450 } | |
| 2451 | |
| 2452 if (DebugDeoptimization && !deopt) { | |
| 2453 deopt = true; // One-time only print before deopt | |
| 2454 tty->print_cr("[BEFORE Deoptimization]"); | |
| 2455 trace_frames(); | |
| 2456 trace_stack(); | |
| 2457 } | |
| 2458 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2459 } | |
| 2460 } | |
| 2461 | |
| 2462 if (DebugDeoptimization && deopt) { | |
| 2463 tty->print_cr("[AFTER Deoptimization]"); | |
| 2464 trace_frames(); | |
| 2465 } | |
| 2466 } | |
| 2467 | |
| 2468 | |
| 2469 // Make zombies | |
| 2470 void JavaThread::make_zombies() { | |
| 2471 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2472 if (fst.current()->can_be_deoptimized()) { | |
| 2473 // it is a Java nmethod | |
| 2474 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
| 2475 nm->make_not_entrant(); | |
| 2476 } | |
| 2477 } | |
| 2478 } | |
| 2479 #endif // PRODUCT | |
| 2480 | |
| 2481 | |
| 2482 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
| 2483 if (!has_last_Java_frame()) return; | |
| 2484 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2485 StackFrameStream fst(this, UseBiasedLocking); | |
| 2486 for(; !fst.is_done(); fst.next()) { | |
| 2487 if (fst.current()->should_be_deoptimized()) { | |
| 2488 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2489 } | |
| 2490 } | |
| 2491 } | |
| 2492 | |
| 2493 | |
| 2494 // GC support | |
| 2495 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
| 2496 | |
| 2497 void JavaThread::gc_epilogue() { | |
| 2498 frames_do(frame_gc_epilogue); | |
| 2499 } | |
| 2500 | |
| 2501 | |
| 2502 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
| 2503 | |
| 2504 void JavaThread::gc_prologue() { | |
| 2505 frames_do(frame_gc_prologue); | |
| 2506 } | |
| 2507 | |
|
1119
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
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diff
changeset
|
2508 // If the caller is a NamedThread, then remember, in the current scope, |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
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parents:
1115
diff
changeset
|
2509 // 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
|
2510 class RememberProcessedThread: public StackObj { |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2511 NamedThread* _cur_thr; |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2512 public: |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2513 RememberProcessedThread(JavaThread* jthr) { |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2514 Thread* thread = Thread::current(); |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2515 if (thread->is_Named_thread()) { |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2516 _cur_thr = (NamedThread *)thread; |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2517 _cur_thr->set_processed_thread(jthr); |
|
547f81740344
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minqi
parents:
1115
diff
changeset
|
2518 } else { |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2519 _cur_thr = NULL; |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2520 } |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2521 } |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2522 |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2523 ~RememberProcessedThread() { |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2524 if (_cur_thr) { |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2525 _cur_thr->set_processed_thread(NULL); |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2526 } |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2527 } |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2528 }; |
| 0 | 2529 |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2530 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 1166 | 2531 // Verify that the deferred card marks have been flushed. |
| 2532 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
|
2533 |
| 0 | 2534 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
| 2535 // since there may be more than one thread using each ThreadProfiler. | |
| 2536 | |
| 2537 // Traverse the GCHandles | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2538 Thread::oops_do(f, cf); |
| 0 | 2539 |
| 2540 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2541 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2542 | |
| 2543 if (has_last_Java_frame()) { | |
|
1119
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2544 // Record JavaThread to GC thread |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2545 RememberProcessedThread rpt(this); |
| 0 | 2546 |
| 2547 // Traverse the privileged stack | |
| 2548 if (_privileged_stack_top != NULL) { | |
| 2549 _privileged_stack_top->oops_do(f); | |
| 2550 } | |
| 2551 | |
| 2552 // traverse the registered growable array | |
| 2553 if (_array_for_gc != NULL) { | |
| 2554 for (int index = 0; index < _array_for_gc->length(); index++) { | |
| 2555 f->do_oop(_array_for_gc->adr_at(index)); | |
| 2556 } | |
| 2557 } | |
| 2558 | |
| 2559 // Traverse the monitor chunks | |
| 2560 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 2561 chunk->oops_do(f); | |
| 2562 } | |
| 2563 | |
| 2564 // Traverse the execution stack | |
| 2565 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
|
2566 fst.current()->oops_do(f, cf, fst.register_map()); |
| 0 | 2567 } |
| 2568 } | |
| 2569 | |
| 2570 // callee_target is never live across a gc point so NULL it here should | |
| 2571 // it still contain a methdOop. | |
| 2572 | |
| 2573 set_callee_target(NULL); | |
| 2574 | |
| 2575 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
| 2576 // If we have deferred set_locals there might be oops waiting to be | |
| 2577 // written | |
| 2578 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
| 2579 if (list != NULL) { | |
| 2580 for (int i = 0; i < list->length(); i++) { | |
| 2581 list->at(i)->oops_do(f); | |
| 2582 } | |
| 2583 } | |
| 2584 | |
| 2585 // Traverse instance variables at the end since the GC may be moving things | |
| 2586 // around using this function | |
| 2587 f->do_oop((oop*) &_threadObj); | |
| 2588 f->do_oop((oop*) &_vm_result); | |
| 2589 f->do_oop((oop*) &_vm_result_2); | |
|
3558
bc95d122df79
added runtime call to supply info upon deoptimization
Lukas Stadler <lukas.stadler@jku.at>
parents:
3555
diff
changeset
|
2590 f->do_oop((oop*) &_graal_deopt_info); |
| 0 | 2591 f->do_oop((oop*) &_exception_oop); |
| 2592 f->do_oop((oop*) &_pending_async_exception); | |
| 2593 | |
| 2594 if (jvmti_thread_state() != NULL) { | |
| 2595 jvmti_thread_state()->oops_do(f); | |
| 2596 } | |
|
3696
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2597 |
|
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2598 if (_scanned_nmethod != NULL && cf != NULL) { |
|
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2599 // Safepoints can occur when the sweeper is scanning an nmethod so |
|
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2600 // process it here to make sure it isn't unloaded in the middle of |
|
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2601 // a scan. |
|
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2602 cf->do_code_blob(_scanned_nmethod); |
|
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2603 } |
| 0 | 2604 } |
| 2605 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2606 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2607 Thread::nmethods_do(cf); // (super method is a no-op) |
| 0 | 2608 |
| 2609 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2610 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2611 | |
| 2612 if (has_last_Java_frame()) { | |
| 2613 // Traverse the execution stack | |
| 2614 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
989
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6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2615 fst.current()->nmethods_do(cf); |
| 0 | 2616 } |
| 2617 } | |
| 2618 } | |
| 2619 | |
| 2620 // Printing | |
| 2621 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
| 2622 switch (_thread_state) { | |
| 2623 case _thread_uninitialized: return "_thread_uninitialized"; | |
| 2624 case _thread_new: return "_thread_new"; | |
| 2625 case _thread_new_trans: return "_thread_new_trans"; | |
| 2626 case _thread_in_native: return "_thread_in_native"; | |
| 2627 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
| 2628 case _thread_in_vm: return "_thread_in_vm"; | |
| 2629 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
| 2630 case _thread_in_Java: return "_thread_in_Java"; | |
| 2631 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
| 2632 case _thread_blocked: return "_thread_blocked"; | |
| 2633 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
| 2634 default: return "unknown thread state"; | |
| 2635 } | |
| 2636 } | |
| 2637 | |
| 2638 #ifndef PRODUCT | |
| 2639 void JavaThread::print_thread_state_on(outputStream *st) const { | |
| 2640 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
| 2641 }; | |
| 2642 void JavaThread::print_thread_state() const { | |
| 2643 print_thread_state_on(tty); | |
| 2644 }; | |
| 2645 #endif // PRODUCT | |
| 2646 | |
| 2647 // Called by Threads::print() for VM_PrintThreads operation | |
| 2648 void JavaThread::print_on(outputStream *st) const { | |
| 2649 st->print("\"%s\" ", get_thread_name()); | |
| 2650 oop thread_oop = threadObj(); | |
| 2651 if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
| 2652 Thread::print_on(st); | |
| 2653 // 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
|
2654 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
| 0 | 2655 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
| 2656 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
| 2657 } | |
| 2658 #ifndef PRODUCT | |
| 2659 print_thread_state_on(st); | |
| 2660 _safepoint_state->print_on(st); | |
| 2661 #endif // PRODUCT | |
| 2662 } | |
| 2663 | |
| 2664 // Called by fatal error handler. The difference between this and | |
| 2665 // JavaThread::print() is that we can't grab lock or allocate memory. | |
| 2666 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
| 2667 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
| 2668 oop thread_obj = threadObj(); | |
| 2669 if (thread_obj != NULL) { | |
| 2670 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
| 2671 } | |
| 2672 st->print(" ["); | |
| 2673 st->print("%s", _get_thread_state_name(_thread_state)); | |
| 2674 if (osthread()) { | |
| 2675 st->print(", id=%d", osthread()->thread_id()); | |
| 2676 } | |
| 2677 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
| 2678 _stack_base - _stack_size, _stack_base); | |
| 2679 st->print("]"); | |
| 2680 return; | |
| 2681 } | |
| 2682 | |
| 2683 // Verification | |
| 2684 | |
| 2685 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
| 2686 | |
| 2687 void JavaThread::verify() { | |
| 2688 // Verify oops in the thread. | |
|
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diff
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|
2689 oops_do(&VerifyOopClosure::verify_oop, NULL); |
| 0 | 2690 |
| 2691 // Verify the stack frames. | |
| 2692 frames_do(frame_verify); | |
| 2693 } | |
| 2694 | |
| 2695 // CR 6300358 (sub-CR 2137150) | |
| 2696 // Most callers of this method assume that it can't return NULL but a | |
| 2697 // thread may not have a name whilst it is in the process of attaching to | |
| 2698 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
| 2699 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
| 2700 // if vm exit occurs during initialization). These cases can all be accounted | |
| 2701 // for such that this method never returns NULL. | |
| 2702 const char* JavaThread::get_thread_name() const { | |
| 2703 #ifdef ASSERT | |
| 2704 // early safepoints can hit while current thread does not yet have TLS | |
| 2705 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 2706 Thread *cur = Thread::current(); | |
| 2707 if (!(cur->is_Java_thread() && cur == this)) { | |
| 2708 // Current JavaThreads are allowed to get their own name without | |
| 2709 // the Threads_lock. | |
| 2710 assert_locked_or_safepoint(Threads_lock); | |
| 2711 } | |
| 2712 } | |
| 2713 #endif // ASSERT | |
| 2714 return get_thread_name_string(); | |
| 2715 } | |
| 2716 | |
| 2717 // Returns a non-NULL representation of this thread's name, or a suitable | |
| 2718 // descriptive string if there is no set name | |
| 2719 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
| 2720 const char* name_str; | |
| 2721 oop thread_obj = threadObj(); | |
| 2722 if (thread_obj != NULL) { | |
| 2723 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
| 2724 if (name != NULL) { | |
| 2725 if (buf == NULL) { | |
| 2726 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2727 } | |
| 2728 else { | |
| 2729 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
| 2730 } | |
| 2731 } | |
| 4006 | 2732 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
| 0 | 2733 name_str = "<no-name - thread is attaching>"; |
| 2734 } | |
| 2735 else { | |
| 2736 name_str = Thread::name(); | |
| 2737 } | |
| 2738 } | |
| 2739 else { | |
| 2740 name_str = Thread::name(); | |
| 2741 } | |
| 2742 assert(name_str != NULL, "unexpected NULL thread name"); | |
| 2743 return name_str; | |
| 2744 } | |
| 2745 | |
| 2746 | |
| 2747 const char* JavaThread::get_threadgroup_name() const { | |
| 2748 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2749 oop thread_obj = threadObj(); | |
| 2750 if (thread_obj != NULL) { | |
| 2751 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2752 if (thread_group != NULL) { | |
| 2753 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
| 2754 // ThreadGroup.name can be null | |
| 2755 if (name != NULL) { | |
| 2756 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2757 return str; | |
| 2758 } | |
| 2759 } | |
| 2760 } | |
| 2761 return NULL; | |
| 2762 } | |
| 2763 | |
| 2764 const char* JavaThread::get_parent_name() const { | |
| 2765 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2766 oop thread_obj = threadObj(); | |
| 2767 if (thread_obj != NULL) { | |
| 2768 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2769 if (thread_group != NULL) { | |
| 2770 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
| 2771 if (parent != NULL) { | |
| 2772 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
| 2773 // ThreadGroup.name can be null | |
| 2774 if (name != NULL) { | |
| 2775 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2776 return str; | |
| 2777 } | |
| 2778 } | |
| 2779 } | |
| 2780 } | |
| 2781 return NULL; | |
| 2782 } | |
| 2783 | |
| 2784 ThreadPriority JavaThread::java_priority() const { | |
| 2785 oop thr_oop = threadObj(); | |
| 2786 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
| 2787 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
| 2788 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
| 2789 return priority; | |
| 2790 } | |
| 2791 | |
| 2792 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
| 2793 | |
| 2794 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
| 2795 // Link Java Thread object <-> C++ Thread | |
| 2796 | |
| 2797 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
| 2798 // and put it into a new Handle. The Handle "thread_oop" can then | |
| 2799 // be used to pass the C++ thread object to other methods. | |
| 2800 | |
| 2801 // Set the Java level thread object (jthread) field of the | |
| 2802 // new thread (a JavaThread *) to C++ thread object using the | |
| 2803 // "thread_oop" handle. | |
| 2804 | |
| 2805 // Set the thread field (a JavaThread *) of the | |
| 2806 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
| 2807 | |
| 2808 Handle thread_oop(Thread::current(), | |
| 2809 JNIHandles::resolve_non_null(jni_thread)); | |
| 2810 assert(instanceKlass::cast(thread_oop->klass())->is_linked(), | |
| 2811 "must be initialized"); | |
| 2812 set_threadObj(thread_oop()); | |
| 2813 java_lang_Thread::set_thread(thread_oop(), this); | |
| 2814 | |
| 2815 if (prio == NoPriority) { | |
| 2816 prio = java_lang_Thread::priority(thread_oop()); | |
| 2817 assert(prio != NoPriority, "A valid priority should be present"); | |
| 2818 } | |
| 2819 | |
| 2820 // Push the Java priority down to the native thread; needs Threads_lock | |
| 2821 Thread::set_priority(this, prio); | |
| 2822 | |
| 2823 // Add the new thread to the Threads list and set it in motion. | |
| 2824 // We must have threads lock in order to call Threads::add. | |
| 2825 // It is crucial that we do not block before the thread is | |
| 2826 // added to the Threads list for if a GC happens, then the java_thread oop | |
| 2827 // will not be visited by GC. | |
| 2828 Threads::add(this); | |
| 2829 } | |
| 2830 | |
| 2831 oop JavaThread::current_park_blocker() { | |
| 2832 // Support for JSR-166 locks | |
| 2833 oop thread_oop = threadObj(); | |
| 242 | 2834 if (thread_oop != NULL && |
| 2835 JDK_Version::current().supports_thread_park_blocker()) { | |
| 0 | 2836 return java_lang_Thread::park_blocker(thread_oop); |
| 2837 } | |
| 2838 return NULL; | |
| 2839 } | |
| 2840 | |
| 2841 | |
| 2842 void JavaThread::print_stack_on(outputStream* st) { | |
| 2843 if (!has_last_Java_frame()) return; | |
| 2844 ResourceMark rm; | |
| 2845 HandleMark hm; | |
| 2846 | |
| 2847 RegisterMap reg_map(this); | |
| 2848 vframe* start_vf = last_java_vframe(®_map); | |
| 2849 int count = 0; | |
| 2850 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 2851 if (f->is_java_frame()) { | |
| 2852 javaVFrame* jvf = javaVFrame::cast(f); | |
| 2853 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
| 2854 | |
| 2855 // Print out lock information | |
| 2856 if (JavaMonitorsInStackTrace) { | |
| 2857 jvf->print_lock_info_on(st, count); | |
| 2858 } | |
| 2859 } else { | |
| 2860 // Ignore non-Java frames | |
| 2861 } | |
| 2862 | |
| 2863 // Bail-out case for too deep stacks | |
| 2864 count++; | |
| 2865 if (MaxJavaStackTraceDepth == count) return; | |
| 2866 } | |
| 2867 } | |
| 2868 | |
| 2869 | |
| 2870 // JVMTI PopFrame support | |
| 2871 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
| 2872 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
| 2873 if (in_bytes(size_in_bytes) != 0) { | |
| 2874 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes)); | |
| 2875 _popframe_preserved_args_size = in_bytes(size_in_bytes); | |
|
1603
d93949c5bdcc
6730276: JDI_REGRESSION tests fail with "Error: count must be non-zero" error on x86
kvn
parents:
1584
diff
changeset
|
2876 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
| 0 | 2877 } |
| 2878 } | |
| 2879 | |
| 2880 void* JavaThread::popframe_preserved_args() { | |
| 2881 return _popframe_preserved_args; | |
| 2882 } | |
| 2883 | |
| 2884 ByteSize JavaThread::popframe_preserved_args_size() { | |
| 2885 return in_ByteSize(_popframe_preserved_args_size); | |
| 2886 } | |
| 2887 | |
| 2888 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
| 2889 int sz = in_bytes(popframe_preserved_args_size()); | |
| 2890 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
| 2891 return in_WordSize(sz / wordSize); | |
| 2892 } | |
| 2893 | |
| 2894 void JavaThread::popframe_free_preserved_args() { | |
| 2895 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
| 2896 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args); | |
| 2897 _popframe_preserved_args = NULL; | |
| 2898 _popframe_preserved_args_size = 0; | |
| 2899 } | |
| 2900 | |
| 2901 #ifndef PRODUCT | |
| 2902 | |
| 2903 void JavaThread::trace_frames() { | |
| 2904 tty->print_cr("[Describe stack]"); | |
| 2905 int frame_no = 1; | |
| 2906 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2907 tty->print(" %d. ", frame_no++); | |
| 2908 fst.current()->print_value_on(tty,this); | |
| 2909 tty->cr(); | |
| 2910 } | |
| 2911 } | |
| 2912 | |
|
3908
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2913 class PrintAndVerifyOopClosure: public OopClosure { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2914 protected: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2915 template <class T> inline void do_oop_work(T* p) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2916 oop obj = oopDesc::load_decode_heap_oop(p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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3899
diff
changeset
|
2917 if (obj == NULL) return; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2918 tty->print(INTPTR_FORMAT ": ", p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2919 if (obj->is_oop_or_null()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2920 if (obj->is_objArray()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2921 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2922 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2923 obj->print(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2924 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2925 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2926 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2927 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2928 tty->cr(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2929 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2930 public: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2931 virtual void do_oop(oop* p) { do_oop_work(p); } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2932 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2933 }; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2934 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2935 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2936 static void oops_print(frame* f, const RegisterMap *map) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2937 PrintAndVerifyOopClosure print; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2938 f->print_value(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2939 f->oops_do(&print, NULL, (RegisterMap*)map); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2940 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2941 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2942 // Print our all the locations that contain oops and whether they are |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2943 // valid or not. This useful when trying to find the oldest frame |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2944 // where an oop has gone bad since the frame walk is from youngest to |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2945 // oldest. |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2946 void JavaThread::trace_oops() { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2947 tty->print_cr("[Trace oops]"); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2948 frames_do(oops_print); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2949 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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3899
diff
changeset
|
2950 |
| 0 | 2951 |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
2952 #ifdef ASSERT |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2953 // Print or validate the layout of stack frames |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2954 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2955 ResourceMark rm; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2956 PRESERVE_EXCEPTION_MARK; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2957 FrameValues values; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2958 int frame_no = 0; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2959 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2960 fst.current()->describe(values, ++frame_no); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2961 if (depth == frame_no) break; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2962 } |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2963 if (validate_only) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2964 values.validate(); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2965 } else { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2966 tty->print_cr("[Describe stack layout]"); |
|
4042
b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
4007
diff
changeset
|
2967 values.print(this); |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2968 } |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2969 } |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
2970 #endif |
|
3336
2e038ad0c1d0
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|
2971 |
| 0 | 2972 void JavaThread::trace_stack_from(vframe* start_vf) { |
| 2973 ResourceMark rm; | |
| 2974 int vframe_no = 1; | |
| 2975 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 2976 if (f->is_java_frame()) { | |
| 2977 javaVFrame::cast(f)->print_activation(vframe_no++); | |
| 2978 } else { | |
| 2979 f->print(); | |
| 2980 } | |
| 2981 if (vframe_no > StackPrintLimit) { | |
| 2982 tty->print_cr("...<more frames>..."); | |
| 2983 return; | |
| 2984 } | |
| 2985 } | |
| 2986 } | |
| 2987 | |
| 2988 | |
| 2989 void JavaThread::trace_stack() { | |
| 2990 if (!has_last_Java_frame()) return; | |
| 2991 ResourceMark rm; | |
| 2992 HandleMark hm; | |
| 2993 RegisterMap reg_map(this); | |
| 2994 trace_stack_from(last_java_vframe(®_map)); | |
| 2995 } | |
| 2996 | |
| 2997 | |
| 2998 #endif // PRODUCT | |
| 2999 | |
| 3000 | |
| 3001 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
| 3002 assert(reg_map != NULL, "a map must be given"); | |
| 3003 frame f = last_frame(); | |
| 3004 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
| 3005 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
| 3006 } | |
| 3007 return NULL; | |
| 3008 } | |
| 3009 | |
| 3010 | |
| 3011 klassOop JavaThread::security_get_caller_class(int depth) { | |
| 3012 vframeStream vfst(this); | |
| 3013 vfst.security_get_caller_frame(depth); | |
| 3014 if (!vfst.at_end()) { | |
| 3015 return vfst.method()->method_holder(); | |
| 3016 } | |
| 3017 return NULL; | |
| 3018 } | |
| 3019 | |
| 3020 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
| 3021 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
|
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Make it possible again to build a real client libjvm, drop the UseGraal flag.
Gilles Duboscq <duboscq@ssw.jku.at>
parents:
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diff
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|
3022 // XXX (gd) currently we still start c1 compiler threads even with Graal, they just die immediately, more compileBroker cleanup is needed to eliminate that |
|
723df37192d6
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Gilles Duboscq <duboscq@ssw.jku.at>
parents:
4137
diff
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|
3023 #ifndef GRAAL |
|
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Make it possible again to build a real client libjvm, drop the UseGraal flag.
Gilles Duboscq <duboscq@ssw.jku.at>
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diff
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|
3024 CompileBroker::compiler_thread_loop(); |
|
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Gilles Duboscq <duboscq@ssw.jku.at>
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|
3025 #endif |
| 0 | 3026 } |
| 3027 | |
| 3028 // Create a CompilerThread | |
| 3029 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
| 3030 : JavaThread(&compiler_thread_entry) { | |
| 3031 _log = NULL; | |
| 3032 _task = NULL; | |
| 3033 _queue = queue; | |
| 3034 _counters = counters; | |
| 3035 | |
| 3036 #ifndef PRODUCT | |
| 3037 _ideal_graph_printer = NULL; | |
| 3038 #endif | |
| 3039 } | |
| 3040 | |
| 3041 // ======= Threads ======== | |
| 3042 | |
| 3043 // The Threads class links together all active threads, and provides | |
| 3044 // operations over all threads. It is protected by its own Mutex | |
| 3045 // lock, which is also used in other contexts to protect thread | |
| 3046 // operations from having the thread being operated on from exiting | |
| 3047 // and going away unexpectedly (e.g., safepoint synchronization) | |
| 3048 | |
| 3049 JavaThread* Threads::_thread_list = NULL; | |
| 3050 int Threads::_number_of_threads = 0; | |
| 3051 int Threads::_number_of_non_daemon_threads = 0; | |
| 3052 int Threads::_return_code = 0; | |
| 3053 size_t JavaThread::_stack_size_at_create = 0; | |
| 3054 | |
| 3055 // All JavaThreads | |
| 3056 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
| 3057 | |
| 3058 void os_stream(); | |
| 3059 | |
| 3060 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
| 3061 void Threads::threads_do(ThreadClosure* tc) { | |
| 3062 assert_locked_or_safepoint(Threads_lock); | |
| 3063 // ALL_JAVA_THREADS iterates through all JavaThreads | |
| 3064 ALL_JAVA_THREADS(p) { | |
| 3065 tc->do_thread(p); | |
| 3066 } | |
| 3067 // Someday we could have a table or list of all non-JavaThreads. | |
| 3068 // For now, just manually iterate through them. | |
| 3069 tc->do_thread(VMThread::vm_thread()); | |
| 3070 Universe::heap()->gc_threads_do(tc); | |
|
323
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|
3071 WatcherThread *wt = WatcherThread::watcher_thread(); |
|
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|
3072 // Strictly speaking, the following NULL check isn't sufficient to make sure |
|
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|
3073 // the data for WatcherThread is still valid upon being examined. However, |
|
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|
3074 // considering that WatchThread terminates when the VM is on the way to |
|
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|
3075 // exit at safepoint, the chance of the above is extremely small. The right |
|
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|
3076 // way to prevent termination of WatcherThread would be to acquire |
|
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|
3077 // Terminator_lock, but we can't do that without violating the lock rank |
|
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|
3078 // checking in some cases. |
|
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|
3079 if (wt != NULL) |
|
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|
3080 tc->do_thread(wt); |
|
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|
3081 |
| 0 | 3082 // If CompilerThreads ever become non-JavaThreads, add them here |
| 3083 } | |
| 3084 | |
| 3085 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
| 3086 | |
| 242 | 3087 extern void JDK_Version_init(); |
| 3088 | |
| 0 | 3089 // Check version |
| 3090 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
| 3091 | |
| 3092 // Initialize the output stream module | |
| 3093 ostream_init(); | |
| 3094 | |
| 3095 // Process java launcher properties. | |
| 3096 Arguments::process_sun_java_launcher_properties(args); | |
| 3097 | |
| 3098 // Initialize the os module before using TLS | |
| 3099 os::init(); | |
| 3100 | |
| 3101 // Initialize system properties. | |
| 3102 Arguments::init_system_properties(); | |
| 3103 | |
| 242 | 3104 // So that JDK version can be used as a discrimintor when parsing arguments |
| 3105 JDK_Version_init(); | |
| 3106 | |
|
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
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parents:
1731
diff
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|
3107 // Update/Initialize System properties after JDK version number is known |
|
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
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1731
diff
changeset
|
3108 Arguments::init_version_specific_system_properties(); |
|
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1731
diff
changeset
|
3109 |
| 0 | 3110 // Parse arguments |
| 3111 jint parse_result = Arguments::parse(args); | |
| 3112 if (parse_result != JNI_OK) return parse_result; | |
| 3113 | |
| 3114 if (PauseAtStartup) { | |
| 3115 os::pause(); | |
| 3116 } | |
| 3117 | |
| 4006 | 3118 #ifndef USDT2 |
| 0 | 3119 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
| 4006 | 3120 #else /* USDT2 */ |
| 3121 HOTSPOT_VM_INIT_BEGIN(); | |
| 3122 #endif /* USDT2 */ | |
| 0 | 3123 |
| 3124 // Record VM creation timing statistics | |
| 3125 TraceVmCreationTime create_vm_timer; | |
| 3126 create_vm_timer.start(); | |
| 3127 | |
| 3128 // Timing (must come after argument parsing) | |
| 3129 TraceTime timer("Create VM", TraceStartupTime); | |
| 3130 | |
| 3131 // Initialize the os module after parsing the args | |
| 3132 jint os_init_2_result = os::init_2(); | |
| 3133 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
| 3134 | |
| 3135 // Initialize output stream logging | |
| 3136 ostream_init_log(); | |
| 3137 | |
| 3138 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
| 3139 // Must be before create_vm_init_agents() | |
| 3140 if (Arguments::init_libraries_at_startup()) { | |
| 3141 convert_vm_init_libraries_to_agents(); | |
| 3142 } | |
| 3143 | |
| 3144 // Launch -agentlib/-agentpath and converted -Xrun agents | |
| 3145 if (Arguments::init_agents_at_startup()) { | |
| 3146 create_vm_init_agents(); | |
| 3147 } | |
| 3148 | |
| 3149 // Initialize Threads state | |
| 3150 _thread_list = NULL; | |
| 3151 _number_of_threads = 0; | |
| 3152 _number_of_non_daemon_threads = 0; | |
| 3153 | |
| 3154 // Initialize TLS | |
| 3155 ThreadLocalStorage::init(); | |
| 3156 | |
| 3157 // Initialize global data structures and create system classes in heap | |
| 3158 vm_init_globals(); | |
| 3159 | |
| 3160 // Attach the main thread to this os thread | |
| 3161 JavaThread* main_thread = new JavaThread(); | |
| 3162 main_thread->set_thread_state(_thread_in_vm); | |
| 3163 // must do this before set_active_handles and initialize_thread_local_storage | |
| 3164 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
| 3165 // change the stack size recorded here to one based on the java thread | |
| 3166 // stacksize. This adjusted size is what is used to figure the placement | |
| 3167 // of the guard pages. | |
| 3168 main_thread->record_stack_base_and_size(); | |
| 3169 main_thread->initialize_thread_local_storage(); | |
| 3170 | |
| 3171 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 3172 | |
| 3173 if (!main_thread->set_as_starting_thread()) { | |
| 3174 vm_shutdown_during_initialization( | |
| 3175 "Failed necessary internal allocation. Out of swap space"); | |
| 3176 delete main_thread; | |
| 3177 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3178 return JNI_ENOMEM; | |
| 3179 } | |
| 3180 | |
| 3181 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
| 3182 // crash Linux VM, see notes in os_linux.cpp. | |
| 3183 main_thread->create_stack_guard_pages(); | |
| 3184 | |
| 1878 | 3185 // Initialize Java-Level synchronization subsystem |
| 3186 ObjectMonitor::Initialize() ; | |
| 0 | 3187 |
| 3188 // Initialize global modules | |
| 3189 jint status = init_globals(); | |
| 3190 if (status != JNI_OK) { | |
| 3191 delete main_thread; | |
| 3192 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3193 return status; | |
| 3194 } | |
| 3195 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1608
diff
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|
3196 // Should be done after the heap is fully created |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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1608
diff
changeset
|
3197 main_thread->cache_global_variables(); |
|
126ea7725993
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diff
changeset
|
3198 |
| 0 | 3199 HandleMark hm; |
| 3200 | |
| 3201 { MutexLocker mu(Threads_lock); | |
| 3202 Threads::add(main_thread); | |
| 3203 } | |
| 3204 | |
| 3205 // Any JVMTI raw monitors entered in onload will transition into | |
| 3206 // real raw monitor. VM is setup enough here for raw monitor enter. | |
| 3207 JvmtiExport::transition_pending_onload_raw_monitors(); | |
| 3208 | |
| 3209 if (VerifyBeforeGC && | |
| 3210 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
| 3211 Universe::heap()->prepare_for_verify(); | |
| 3212 Universe::verify(); // make sure we're starting with a clean slate | |
| 3213 } | |
| 3214 | |
| 3215 // Create the VMThread | |
| 3216 { TraceTime timer("Start VMThread", TraceStartupTime); | |
| 3217 VMThread::create(); | |
| 3218 Thread* vmthread = VMThread::vm_thread(); | |
| 3219 | |
| 3220 if (!os::create_thread(vmthread, os::vm_thread)) | |
| 3221 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
| 3222 | |
| 3223 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
| 3224 // Monitors can have spurious returns, must always check another state flag | |
| 3225 { | |
| 3226 MutexLocker ml(Notify_lock); | |
| 3227 os::start_thread(vmthread); | |
| 3228 while (vmthread->active_handles() == NULL) { | |
| 3229 Notify_lock->wait(); | |
| 3230 } | |
| 3231 } | |
| 3232 } | |
| 3233 | |
| 3234 assert (Universe::is_fully_initialized(), "not initialized"); | |
| 3235 EXCEPTION_MARK; | |
| 3236 | |
| 3237 // At this point, the Universe is initialized, but we have not executed | |
| 3238 // any byte code. Now is a good time (the only time) to dump out the | |
| 3239 // internal state of the JVM for sharing. | |
| 3240 | |
| 3241 if (DumpSharedSpaces) { | |
| 3242 Universe::heap()->preload_and_dump(CHECK_0); | |
| 3243 ShouldNotReachHere(); | |
| 3244 } | |
| 3245 | |
| 3246 // Always call even when there are not JVMTI environments yet, since environments | |
| 3247 // may be attached late and JVMTI must track phases of VM execution | |
| 3248 JvmtiExport::enter_start_phase(); | |
| 3249 | |
| 3250 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
| 3251 JvmtiExport::post_vm_start(); | |
| 3252 | |
| 3253 { | |
| 3254 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
| 3255 | |
| 3256 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3257 create_vm_init_libraries(); | |
| 3258 } | |
| 3259 | |
| 3260 if (InitializeJavaLangString) { | |
|
2177
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2162
diff
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|
3261 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
| 0 | 3262 } else { |
| 3263 warning("java.lang.String not initialized"); | |
| 3264 } | |
| 3265 | |
|
18
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|
3266 if (AggressiveOpts) { |
|
192
6d13fcb3663f
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diff
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|
3267 { |
|
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diff
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|
3268 // Forcibly initialize java/util/HashMap and mutate the private |
|
6d13fcb3663f
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parents:
62
diff
changeset
|
3269 // static final "frontCacheEnabled" field before we start creating instances |
|
18
c7d713375c94
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diff
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|
3270 #ifdef ASSERT |
|
2177
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coleenp
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diff
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|
3271 klassOop tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
192
6d13fcb3663f
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diff
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|
3272 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
|
18
c7d713375c94
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|
3273 #endif |
|
2177
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diff
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|
3274 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
192
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|
3275 KlassHandle k = KlassHandle(THREAD, k_o); |
|
6d13fcb3663f
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diff
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|
3276 guarantee(k.not_null(), "Must find java/util/HashMap"); |
|
6d13fcb3663f
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62
diff
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|
3277 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
6d13fcb3663f
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diff
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|
3278 ik->initialize(CHECK_0); |
|
6d13fcb3663f
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diff
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|
3279 fieldDescriptor fd; |
|
6d13fcb3663f
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diff
changeset
|
3280 // Possible we might not find this field; if so, don't break |
|
6d13fcb3663f
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|
3281 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
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diff
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|
3282 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
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|
3283 } |
|
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diff
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|
3284 } |
|
6d13fcb3663f
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|
3285 |
|
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|
3286 if (UseStringCache) { |
|
669
eca19a8425b5
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changeset
|
3287 // Forcibly initialize java/lang/StringValue and mutate the private |
|
192
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|
3288 // static final "stringCacheEnabled" field before we start creating instances |
|
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|
3289 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
|
669
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diff
changeset
|
3290 // Possible that StringValue isn't present: if so, silently don't break |
|
eca19a8425b5
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diff
changeset
|
3291 if (k_o != NULL) { |
|
eca19a8425b5
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diff
changeset
|
3292 KlassHandle k = KlassHandle(THREAD, k_o); |
|
eca19a8425b5
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diff
changeset
|
3293 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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diff
changeset
|
3294 ik->initialize(CHECK_0); |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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diff
changeset
|
3295 fieldDescriptor fd; |
|
eca19a8425b5
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441
diff
changeset
|
3296 // Possible we might not find this field: if so, silently don't break |
|
eca19a8425b5
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diff
changeset
|
3297 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
2376
c7f3d0b4570f
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2302
diff
changeset
|
3298 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3299 } |
|
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3300 } |
|
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3301 } |
|
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3302 } |
|
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3303 |
| 0 | 3304 // Initialize java_lang.System (needed before creating the thread) |
| 3305 if (InitializeJavaLangSystem) { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3306 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3307 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
| 0 | 3308 Handle thread_group = create_initial_thread_group(CHECK_0); |
| 3309 Universe::set_main_thread_group(thread_group()); | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3310 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
| 0 | 3311 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
| 3312 main_thread->set_threadObj(thread_object); | |
| 3313 // Set thread status to running since main thread has | |
| 3314 // been started and running. | |
| 3315 java_lang_Thread::set_thread_status(thread_object, | |
| 3316 java_lang_Thread::RUNNABLE); | |
| 3317 | |
| 3318 // The VM preresolve methods to these classes. Make sure that get initialized | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3319 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3320 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
| 0 | 3321 // The VM creates & returns objects of this class. Make sure it's initialized. |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3322 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
| 0 | 3323 call_initializeSystemClass(CHECK_0); |
| 3324 } else { | |
| 3325 warning("java.lang.System not initialized"); | |
| 3326 } | |
| 3327 | |
| 3328 // an instance of OutOfMemory exception has been allocated earlier | |
| 3329 if (InitializeJavaLangExceptionsErrors) { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3330 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3331 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3332 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3333 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3334 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3335 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3336 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
| 0 | 3337 } else { |
| 3338 warning("java.lang.OutOfMemoryError has not been initialized"); | |
| 3339 warning("java.lang.NullPointerException has not been initialized"); | |
| 3340 warning("java.lang.ClassCastException has not been initialized"); | |
| 3341 warning("java.lang.ArrayStoreException has not been initialized"); | |
| 3342 warning("java.lang.ArithmeticException has not been initialized"); | |
| 3343 warning("java.lang.StackOverflowError has not been initialized"); | |
| 3344 } | |
|
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2376
diff
changeset
|
3345 } |
| 0 | 3346 |
| 3347 // See : bugid 4211085. | |
| 3348 // Background : the static initializer of java.lang.Compiler tries to read | |
| 3349 // property"java.compiler" and read & write property "java.vm.info". | |
| 3350 // When a security manager is installed through the command line | |
| 3351 // option "-Djava.security.manager", the above properties are not | |
| 3352 // readable and the static initializer for java.lang.Compiler fails | |
| 3353 // resulting in a NoClassDefFoundError. This can happen in any | |
| 3354 // user code which calls methods in java.lang.Compiler. | |
| 3355 // Hack : the hack is to pre-load and initialize this class, so that only | |
| 3356 // system domains are on the stack when the properties are read. | |
| 3357 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
| 3358 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
| 3359 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
| 3360 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
| 3361 // Once that is done, we should remove this hack. | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3362 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
| 0 | 3363 |
| 3364 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
| 3365 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
| 3366 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
| 3367 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
| 3368 // This should also be taken out as soon as 4211383 gets fixed. | |
| 3369 reset_vm_info_property(CHECK_0); | |
| 3370 | |
| 3371 quicken_jni_functions(); | |
| 3372 | |
| 3373 // Set flag that basic initialization has completed. Used by exceptions and various | |
| 3374 // debug stuff, that does not work until all basic classes have been initialized. | |
| 3375 set_init_completed(); | |
| 3376 | |
| 4006 | 3377 #ifndef USDT2 |
| 0 | 3378 HS_DTRACE_PROBE(hotspot, vm__init__end); |
| 4006 | 3379 #else /* USDT2 */ |
| 3380 HOTSPOT_VM_INIT_END(); | |
| 3381 #endif /* USDT2 */ | |
| 0 | 3382 |
| 3383 // record VM initialization completion time | |
| 3384 Management::record_vm_init_completed(); | |
| 3385 | |
| 3386 // Compute system loader. Note that this has to occur after set_init_completed, since | |
| 3387 // valid exceptions may be thrown in the process. | |
| 3388 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
| 3389 // set_init_completed has just been called, causing exceptions not to be shortcut | |
| 3390 // anymore. We call vm_exit_during_initialization directly instead. | |
| 3391 SystemDictionary::compute_java_system_loader(THREAD); | |
| 3392 if (HAS_PENDING_EXCEPTION) { | |
| 3393 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3394 } | |
| 3395 | |
| 3396 #ifndef SERIALGC | |
| 3397 // Support for ConcurrentMarkSweep. This should be cleaned up | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3398 // 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
|
3399 // once things are properly refactored. XXX YSR |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3400 if (UseConcMarkSweepGC || UseG1GC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3401 if (UseConcMarkSweepGC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3402 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3403 } else { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3404 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3405 } |
| 0 | 3406 if (HAS_PENDING_EXCEPTION) { |
| 3407 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3408 } | |
| 3409 } | |
| 3410 #endif // SERIALGC | |
| 3411 | |
| 3412 // Always call even when there are not JVMTI environments yet, since environments | |
| 3413 // may be attached late and JVMTI must track phases of VM execution | |
| 3414 JvmtiExport::enter_live_phase(); | |
| 3415 | |
| 3416 // Signal Dispatcher needs to be started before VMInit event is posted | |
| 3417 os::signal_init(); | |
| 3418 | |
| 3419 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
| 3420 if (!DisableAttachMechanism) { | |
| 3421 if (StartAttachListener || AttachListener::init_at_startup()) { | |
| 3422 AttachListener::init(); | |
| 3423 } | |
| 3424 } | |
| 3425 | |
| 3426 // Launch -Xrun agents | |
| 3427 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
| 3428 // back-end can launch with -Xdebug -Xrunjdwp. | |
| 3429 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3430 create_vm_init_libraries(); | |
| 3431 } | |
| 3432 | |
| 3433 // Notify JVMTI agents that VM initialization is complete - nop if no agents. | |
| 3434 JvmtiExport::post_vm_initialized(); | |
| 3435 | |
|
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3436 if (CleanChunkPoolAsync) { |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3437 Chunk::start_chunk_pool_cleaner_task(); |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3438 } |
| 0 | 3439 |
| 3440 // initialize compiler(s) | |
| 3441 CompileBroker::compilation_init(); | |
| 3442 | |
| 3443 Management::initialize(THREAD); | |
| 3444 if (HAS_PENDING_EXCEPTION) { | |
| 3445 // management agent fails to start possibly due to | |
| 3446 // configuration problem and is responsible for printing | |
| 3447 // stack trace if appropriate. Simply exit VM. | |
| 3448 vm_exit(1); | |
| 3449 } | |
| 3450 | |
| 3451 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
| 3452 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
| 3453 if (MemProfiling) MemProfiler::engage(); | |
| 3454 StatSampler::engage(); | |
| 3455 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
| 3456 | |
| 3457 BiasedLocking::init(); | |
| 3458 | |
|
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3459 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
|
3460 call_postVMInitHook(THREAD); |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3461 // 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
|
3462 // exceptions and provide means of diagnosis. |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3463 if (HAS_PENDING_EXCEPTION) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3464 CLEAR_PENDING_EXCEPTION; |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3465 } |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3466 } |
| 0 | 3467 |
| 3468 // Start up the WatcherThread if there are any periodic tasks | |
| 3469 // NOTE: All PeriodicTasks should be registered by now. If they | |
| 3470 // aren't, late joiners might appear to start slowly (we might | |
| 3471 // take a while to process their first tick). | |
| 3472 if (PeriodicTask::num_tasks() > 0) { | |
| 3473 WatcherThread::start(); | |
| 3474 } | |
| 3475 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3476 // Give os specific code one last chance to start |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3477 os::init_3(); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3478 |
| 0 | 3479 create_vm_timer.end(); |
| 3480 return JNI_OK; | |
| 3481 } | |
| 3482 | |
| 3483 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
| 3484 extern "C" { | |
| 3485 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
| 3486 } | |
| 3487 // Find a command line agent library and return its entry point for | |
| 3488 // -agentlib: -agentpath: -Xrun | |
| 3489 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
| 3490 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
| 3491 OnLoadEntry_t on_load_entry = NULL; | |
| 3492 void *library = agent->os_lib(); // check if we have looked it up before | |
| 3493 | |
| 3494 if (library == NULL) { | |
| 3495 char buffer[JVM_MAXPATHLEN]; | |
| 3496 char ebuf[1024]; | |
| 3497 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
|
3498 const char *msg = "Could not find agent library "; |
| 0 | 3499 |
| 3500 if (agent->is_absolute_path()) { | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3501 library = os::dll_load(name, ebuf, sizeof ebuf); |
| 0 | 3502 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3503 const char *sub_msg = " in absolute path, with error: "; |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3504 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3505 char *buf = NEW_C_HEAP_ARRAY(char, len); |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3506 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3507 // If we can't find the agent, exit. |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3508 vm_exit_during_initialization(buf, NULL); |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3509 FREE_C_HEAP_ARRAY(char, buf); |
| 0 | 3510 } |
| 3511 } else { | |
| 3512 // Try to load the agent from the standard dll directory | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3513 os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3514 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3515 #ifdef KERNEL |
| 3516 // Download instrument dll | |
| 3517 if (library == NULL && strcmp(name, "instrument") == 0) { | |
| 3518 char *props = Arguments::get_kernel_properties(); | |
| 3519 char *home = Arguments::get_java_home(); | |
| 3520 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
| 3521 " sun.jkernel.DownloadManager -download client_jvm"; | |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3522 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3523 char *cmd = NEW_C_HEAP_ARRAY(char, length); |
| 0 | 3524 jio_snprintf(cmd, length, fmt, home, props); |
| 3525 int status = os::fork_and_exec(cmd); | |
| 3526 FreeHeap(props); | |
| 3527 if (status == -1) { | |
| 3528 warning(cmd); | |
| 3529 vm_exit_during_initialization("fork_and_exec failed: %s", | |
| 3530 strerror(errno)); | |
| 3531 } | |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3532 FREE_C_HEAP_ARRAY(char, cmd); |
| 0 | 3533 // when this comes back the instrument.dll should be where it belongs. |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3534 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3535 } |
| 3536 #endif // KERNEL | |
| 3537 if (library == NULL) { // Try the local directory | |
| 3538 char ns[1] = {0}; | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3539 os::dll_build_name(buffer, sizeof(buffer), ns, name); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3540 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3541 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3542 const char *sub_msg = " on the library path, with error: "; |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3543 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3544 char *buf = NEW_C_HEAP_ARRAY(char, len); |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3545 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3546 // If we can't find the agent, exit. |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3547 vm_exit_during_initialization(buf, NULL); |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3548 FREE_C_HEAP_ARRAY(char, buf); |
| 0 | 3549 } |
| 3550 } | |
| 3551 } | |
| 3552 agent->set_os_lib(library); | |
| 3553 } | |
| 3554 | |
| 3555 // Find the OnLoad function. | |
| 3556 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3557 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
| 0 | 3558 if (on_load_entry != NULL) break; |
| 3559 } | |
| 3560 return on_load_entry; | |
| 3561 } | |
| 3562 | |
| 3563 // Find the JVM_OnLoad entry point | |
| 3564 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
| 3565 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
| 3566 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3567 } | |
| 3568 | |
| 3569 // Find the Agent_OnLoad entry point | |
| 3570 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
| 3571 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
| 3572 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3573 } | |
| 3574 | |
| 3575 // For backwards compatibility with -Xrun | |
| 3576 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
| 3577 // treated like -agentpath: | |
| 3578 // Must be called before agent libraries are created | |
| 3579 void Threads::convert_vm_init_libraries_to_agents() { | |
| 3580 AgentLibrary* agent; | |
| 3581 AgentLibrary* next; | |
| 3582 | |
| 3583 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
| 3584 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
| 3585 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3586 | |
| 3587 // If there is an JVM_OnLoad function it will get called later, | |
| 3588 // otherwise see if there is an Agent_OnLoad | |
| 3589 if (on_load_entry == NULL) { | |
| 3590 on_load_entry = lookup_agent_on_load(agent); | |
| 3591 if (on_load_entry != NULL) { | |
| 3592 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
| 3593 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
| 3594 Arguments::convert_library_to_agent(agent); | |
| 3595 } else { | |
| 3596 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
| 3597 } | |
| 3598 } | |
| 3599 } | |
| 3600 } | |
| 3601 | |
| 3602 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
| 3603 // Invokes Agent_OnLoad | |
| 3604 // Called very early -- before JavaThreads exist | |
| 3605 void Threads::create_vm_init_agents() { | |
| 3606 extern struct JavaVM_ main_vm; | |
| 3607 AgentLibrary* agent; | |
| 3608 | |
| 3609 JvmtiExport::enter_onload_phase(); | |
| 3610 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3611 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
| 3612 | |
| 3613 if (on_load_entry != NULL) { | |
| 3614 // Invoke the Agent_OnLoad function | |
| 3615 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3616 if (err != JNI_OK) { | |
| 3617 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
| 3618 } | |
| 3619 } else { | |
| 3620 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
| 3621 } | |
| 3622 } | |
| 3623 JvmtiExport::enter_primordial_phase(); | |
| 3624 } | |
| 3625 | |
| 3626 extern "C" { | |
| 3627 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
| 3628 } | |
| 3629 | |
| 3630 void Threads::shutdown_vm_agents() { | |
| 3631 // Send any Agent_OnUnload notifications | |
| 3632 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
| 3633 extern struct JavaVM_ main_vm; | |
| 3634 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3635 | |
| 3636 // Find the Agent_OnUnload function. | |
| 3637 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
| 3638 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
|
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|
3639 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
| 0 | 3640 |
| 3641 // Invoke the Agent_OnUnload function | |
| 3642 if (unload_entry != NULL) { | |
| 3643 JavaThread* thread = JavaThread::current(); | |
| 3644 ThreadToNativeFromVM ttn(thread); | |
| 3645 HandleMark hm(thread); | |
| 3646 (*unload_entry)(&main_vm); | |
| 3647 break; | |
| 3648 } | |
| 3649 } | |
| 3650 } | |
| 3651 } | |
| 3652 | |
| 3653 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
| 3654 // Invokes JVM_OnLoad | |
| 3655 void Threads::create_vm_init_libraries() { | |
| 3656 extern struct JavaVM_ main_vm; | |
| 3657 AgentLibrary* agent; | |
| 3658 | |
| 3659 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
| 3660 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3661 | |
| 3662 if (on_load_entry != NULL) { | |
| 3663 // Invoke the JVM_OnLoad function | |
| 3664 JavaThread* thread = JavaThread::current(); | |
| 3665 ThreadToNativeFromVM ttn(thread); | |
| 3666 HandleMark hm(thread); | |
| 3667 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3668 if (err != JNI_OK) { | |
| 3669 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
| 3670 } | |
| 3671 } else { | |
| 3672 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
| 3673 } | |
| 3674 } | |
| 3675 } | |
| 3676 | |
| 3677 // Last thread running calls java.lang.Shutdown.shutdown() | |
| 3678 void JavaThread::invoke_shutdown_hooks() { | |
| 3679 HandleMark hm(this); | |
| 3680 | |
| 3681 // We could get here with a pending exception, if so clear it now. | |
| 3682 if (this->has_pending_exception()) { | |
| 3683 this->clear_pending_exception(); | |
| 3684 } | |
| 3685 | |
| 3686 EXCEPTION_MARK; | |
| 3687 klassOop k = | |
|
2177
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6990754: Use native memory and reference counting to implement SymbolTable
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2162
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changeset
|
3688 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
| 0 | 3689 THREAD); |
| 3690 if (k != NULL) { | |
| 3691 // SystemDictionary::resolve_or_null will return null if there was | |
| 3692 // an exception. If we cannot load the Shutdown class, just don't | |
| 3693 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
| 3694 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
| 3695 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
| 3696 // was called, the Shutdown class would have already been loaded | |
| 3697 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
| 3698 instanceKlassHandle shutdown_klass (THREAD, k); | |
| 3699 JavaValue result(T_VOID); | |
| 3700 JavaCalls::call_static(&result, | |
| 3701 shutdown_klass, | |
|
2177
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6990754: Use native memory and reference counting to implement SymbolTable
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2162
diff
changeset
|
3702 vmSymbols::shutdown_method_name(), |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2162
diff
changeset
|
3703 vmSymbols::void_method_signature(), |
| 0 | 3704 THREAD); |
| 3705 } | |
| 3706 CLEAR_PENDING_EXCEPTION; | |
| 3707 } | |
| 3708 | |
| 3709 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
| 3710 // the program falls off the end of main(). Another VM exit path is through | |
| 3711 // vm_exit() when the program calls System.exit() to return a value or when | |
| 3712 // there is a serious error in VM. The two shutdown paths are not exactly | |
| 3713 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
| 3714 // and VM_Exit op at VM level. | |
| 3715 // | |
| 3716 // Shutdown sequence: | |
| 3717 // + Wait until we are the last non-daemon thread to execute | |
| 3718 // <-- every thing is still working at this moment --> | |
| 3719 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
| 3720 // shutdown hooks, run finalizers if finalization-on-exit | |
| 3721 // + Call before_exit(), prepare for VM exit | |
| 3722 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
| 3723 // currently the only user of this mechanism is File.deleteOnExit()) | |
| 3724 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
| 3725 // post thread end and vm death events to JVMTI, | |
| 3726 // stop signal thread | |
| 3727 // + Call JavaThread::exit(), it will: | |
| 3728 // > release JNI handle blocks, remove stack guard pages | |
| 3729 // > remove this thread from Threads list | |
| 3730 // <-- no more Java code from this thread after this point --> | |
| 3731 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
| 3732 // the compiler threads at safepoint | |
| 3733 // <-- do not use anything that could get blocked by Safepoint --> | |
| 3734 // + Disable tracing at JNI/JVM barriers | |
| 3735 // + Set _vm_exited flag for threads that are still running native code | |
| 3736 // + Delete this thread | |
| 3737 // + Call exit_globals() | |
| 3738 // > deletes tty | |
| 3739 // > deletes PerfMemory resources | |
| 3740 // + Return to caller | |
| 3741 | |
| 3742 bool Threads::destroy_vm() { | |
| 3743 JavaThread* thread = JavaThread::current(); | |
| 3744 | |
| 3745 // Wait until we are the last non-daemon thread to execute | |
| 3746 { MutexLocker nu(Threads_lock); | |
| 3747 while (Threads::number_of_non_daemon_threads() > 1 ) | |
| 3748 // This wait should make safepoint checks, wait without a timeout, | |
| 3749 // and wait as a suspend-equivalent condition. | |
| 3750 // | |
| 3751 // Note: If the FlatProfiler is running and this thread is waiting | |
| 3752 // for another non-daemon thread to finish, then the FlatProfiler | |
| 3753 // is waiting for the external suspend request on this thread to | |
| 3754 // complete. wait_for_ext_suspend_completion() will eventually | |
| 3755 // timeout, but that takes time. Making this wait a suspend- | |
| 3756 // equivalent condition solves that timeout problem. | |
| 3757 // | |
| 3758 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 3759 Mutex::_as_suspend_equivalent_flag); | |
| 3760 } | |
| 3761 | |
| 3762 // Hang forever on exit if we are reporting an error. | |
| 3763 if (ShowMessageBoxOnError && is_error_reported()) { | |
| 3764 os::infinite_sleep(); | |
| 3765 } | |
|
2302
da091bb67459
7022037: Pause when exiting if debugger is attached on windows
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2203
diff
changeset
|
3766 os::wait_for_keypress_at_exit(); |
| 0 | 3767 |
| 3768 if (JDK_Version::is_jdk12x_version()) { | |
| 3769 // We are the last thread running, so check if finalizers should be run. | |
| 3770 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
| 3771 HandleMark rm(thread); | |
| 3772 Universe::run_finalizers_on_exit(); | |
| 3773 } else { | |
| 3774 // run Java level shutdown hooks | |
| 3775 thread->invoke_shutdown_hooks(); | |
| 3776 } | |
| 3777 | |
| 3778 before_exit(thread); | |
| 3779 | |
| 3780 thread->exit(true); | |
| 3781 | |
| 3782 // Stop VM thread. | |
| 3783 { | |
| 3784 // 4945125 The vm thread comes to a safepoint during exit. | |
| 3785 // GC vm_operations can get caught at the safepoint, and the | |
| 3786 // heap is unparseable if they are caught. Grab the Heap_lock | |
| 3787 // to prevent this. The GC vm_operations will not be able to | |
| 3788 // queue until after the vm thread is dead. | |
|
3769
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3789 // After this point, we'll never emerge out of the safepoint before |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3790 // the VM exits, so concurrent GC threads do not need to be explicitly |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3791 // stopped; they remain inactive until the process exits. |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3792 // Note: some concurrent G1 threads may be running during a safepoint, |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3793 // but these will not be accessing the heap, just some G1-specific side |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3794 // data structures that are not accessed by any other threads but them |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3795 // after this point in a terminal safepoint. |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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3388
diff
changeset
|
3796 |
| 0 | 3797 MutexLocker ml(Heap_lock); |
| 3798 | |
| 3799 VMThread::wait_for_vm_thread_exit(); | |
| 3800 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
| 3801 VMThread::destroy(); | |
| 3802 } | |
| 3803 | |
| 3804 // clean up ideal graph printers | |
| 3805 #if defined(COMPILER2) && !defined(PRODUCT) | |
| 3806 IdealGraphPrinter::clean_up(); | |
| 3807 #endif | |
| 3808 | |
| 3809 // Now, all Java threads are gone except daemon threads. Daemon threads | |
| 3810 // running Java code or in VM are stopped by the Safepoint. However, | |
| 3811 // daemon threads executing native code are still running. But they | |
| 3812 // will be stopped at native=>Java/VM barriers. Note that we can't | |
| 3813 // simply kill or suspend them, as it is inherently deadlock-prone. | |
| 3814 | |
| 3815 #ifndef PRODUCT | |
| 3816 // disable function tracing at JNI/JVM barriers | |
| 3817 TraceJNICalls = false; | |
| 3818 TraceJVMCalls = false; | |
| 3819 TraceRuntimeCalls = false; | |
| 3820 #endif | |
| 3821 | |
| 3822 VM_Exit::set_vm_exited(); | |
| 3823 | |
| 3824 notify_vm_shutdown(); | |
| 3825 | |
| 3826 delete thread; | |
| 3827 | |
| 3828 // exit_globals() will delete tty | |
| 3829 exit_globals(); | |
| 3830 | |
| 3831 return true; | |
| 3832 } | |
| 3833 | |
| 3834 | |
| 3835 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
| 3836 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
| 3837 return is_supported_jni_version(version); | |
| 3838 } | |
| 3839 | |
| 3840 | |
| 3841 jboolean Threads::is_supported_jni_version(jint version) { | |
| 3842 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
| 3843 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
| 3844 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
| 3845 return JNI_FALSE; | |
| 3846 } | |
| 3847 | |
| 3848 | |
| 3849 void Threads::add(JavaThread* p, bool force_daemon) { | |
| 3850 // The threads lock must be owned at this point | |
| 3851 assert_locked_or_safepoint(Threads_lock); | |
|
1842
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
tonyp
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1838
diff
changeset
|
3852 |
|
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
tonyp
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1838
diff
changeset
|
3853 // 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
|
3854 // why it is called here. |
|
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
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1838
diff
changeset
|
3855 p->initialize_queues(); |
| 0 | 3856 p->set_next(_thread_list); |
| 3857 _thread_list = p; | |
| 3858 _number_of_threads++; | |
| 3859 oop threadObj = p->threadObj(); | |
| 3860 bool daemon = true; | |
| 3861 // Bootstrapping problem: threadObj can be null for initial | |
| 3862 // JavaThread (or for threads attached via JNI) | |
| 3863 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
| 3864 _number_of_non_daemon_threads++; | |
| 3865 daemon = false; | |
| 3866 } | |
| 3867 | |
| 3868 ThreadService::add_thread(p, daemon); | |
| 3869 | |
| 3870 // Possible GC point. | |
| 3871 Events::log("Thread added: " INTPTR_FORMAT, p); | |
| 3872 } | |
| 3873 | |
| 3874 void Threads::remove(JavaThread* p) { | |
| 3875 // Extra scope needed for Thread_lock, so we can check | |
| 3876 // that we do not remove thread without safepoint code notice | |
| 3877 { MutexLocker ml(Threads_lock); | |
| 3878 | |
| 3879 assert(includes(p), "p must be present"); | |
| 3880 | |
| 3881 JavaThread* current = _thread_list; | |
| 3882 JavaThread* prev = NULL; | |
| 3883 | |
| 3884 while (current != p) { | |
| 3885 prev = current; | |
| 3886 current = current->next(); | |
| 3887 } | |
| 3888 | |
| 3889 if (prev) { | |
| 3890 prev->set_next(current->next()); | |
| 3891 } else { | |
| 3892 _thread_list = p->next(); | |
| 3893 } | |
| 3894 _number_of_threads--; | |
| 3895 oop threadObj = p->threadObj(); | |
| 3896 bool daemon = true; | |
| 3897 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
| 3898 _number_of_non_daemon_threads--; | |
| 3899 daemon = false; | |
| 3900 | |
| 3901 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
| 3902 // on destroy_vm will wake up. | |
| 3903 if (number_of_non_daemon_threads() == 1) | |
| 3904 Threads_lock->notify_all(); | |
| 3905 } | |
| 3906 ThreadService::remove_thread(p, daemon); | |
| 3907 | |
| 3908 // Make sure that safepoint code disregard this thread. This is needed since | |
| 3909 // the thread might mess around with locks after this point. This can cause it | |
| 3910 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
| 3911 // of this thread since it is removed from the queue. | |
| 3912 p->set_terminated_value(); | |
| 3913 } // unlock Threads_lock | |
| 3914 | |
| 3915 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
| 3916 Events::log("Thread exited: " INTPTR_FORMAT, p); | |
| 3917 } | |
| 3918 | |
| 3919 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
| 3920 bool Threads::includes(JavaThread* p) { | |
| 3921 assert(Threads_lock->is_locked(), "sanity check"); | |
| 3922 ALL_JAVA_THREADS(q) { | |
| 3923 if (q == p ) { | |
| 3924 return true; | |
| 3925 } | |
| 3926 } | |
| 3927 return false; | |
| 3928 } | |
| 3929 | |
| 3930 // Operations on the Threads list for GC. These are not explicitly locked, | |
| 3931 // but the garbage collector must provide a safe context for them to run. | |
| 3932 // In particular, these things should never be called when the Threads_lock | |
| 3933 // is held by some other thread. (Note: the Safepoint abstraction also | |
| 3934 // uses the Threads_lock to gurantee this property. It also makes sure that | |
| 3935 // all threads gets blocked when exiting or starting). | |
| 3936 | |
|
989
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6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3937 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 3938 ALL_JAVA_THREADS(p) { |
|
989
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6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3939 p->oops_do(f, cf); |
| 0 | 3940 } |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3941 VMThread::vm_thread()->oops_do(f, cf); |
| 0 | 3942 } |
| 3943 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3944 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 3945 // Introduce a mechanism allowing parallel threads to claim threads as |
| 3946 // root groups. Overhead should be small enough to use all the time, | |
| 3947 // even in sequential code. | |
| 3948 SharedHeap* sh = SharedHeap::heap(); | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
3949 // Cannot yet substitute active_workers for n_par_threads |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
3950 // because of G1CollectedHeap::verify() use of |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
3951 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
3952 // 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
|
3953 // is being used for parallelism elsewhere. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
3954 bool is_par = sh->n_par_threads() > 0; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
3955 assert(!is_par || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4042
diff
changeset
|
3956 (SharedHeap::heap()->n_par_threads() == |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
3957 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
| 0 | 3958 int cp = SharedHeap::heap()->strong_roots_parity(); |
| 3959 ALL_JAVA_THREADS(p) { | |
| 3960 if (p->claim_oops_do(is_par, cp)) { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3961 p->oops_do(f, cf); |
| 0 | 3962 } |
| 3963 } | |
| 3964 VMThread* vmt = VMThread::vm_thread(); | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3938
diff
changeset
|
3965 if (vmt->claim_oops_do(is_par, cp)) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3966 vmt->oops_do(f, cf); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3938
diff
changeset
|
3967 } |
| 0 | 3968 } |
| 3969 | |
| 3970 #ifndef SERIALGC | |
| 3971 // Used by ParallelScavenge | |
| 3972 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
| 3973 ALL_JAVA_THREADS(p) { | |
| 3974 q->enqueue(new ThreadRootsTask(p)); | |
| 3975 } | |
| 3976 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
| 3977 } | |
| 3978 | |
| 3979 // Used by Parallel Old | |
| 3980 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
| 3981 ALL_JAVA_THREADS(p) { | |
| 3982 q->enqueue(new ThreadRootsMarkingTask(p)); | |
| 3983 } | |
| 3984 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
| 3985 } | |
| 3986 #endif // SERIALGC | |
| 3987 | |
|
989
148e5441d916
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jrose
parents:
844
diff
changeset
|
3988 void Threads::nmethods_do(CodeBlobClosure* cf) { |
| 0 | 3989 ALL_JAVA_THREADS(p) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3990 p->nmethods_do(cf); |
| 0 | 3991 } |
|
989
148e5441d916
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jrose
parents:
844
diff
changeset
|
3992 VMThread::vm_thread()->nmethods_do(cf); |
| 0 | 3993 } |
| 3994 | |
| 3995 void Threads::gc_epilogue() { | |
| 3996 ALL_JAVA_THREADS(p) { | |
| 3997 p->gc_epilogue(); | |
| 3998 } | |
| 3999 } | |
| 4000 | |
| 4001 void Threads::gc_prologue() { | |
| 4002 ALL_JAVA_THREADS(p) { | |
| 4003 p->gc_prologue(); | |
| 4004 } | |
| 4005 } | |
| 4006 | |
| 4007 void Threads::deoptimized_wrt_marked_nmethods() { | |
| 4008 ALL_JAVA_THREADS(p) { | |
| 4009 p->deoptimized_wrt_marked_nmethods(); | |
| 4010 } | |
| 4011 } | |
| 4012 | |
| 4013 | |
| 4014 // Get count Java threads that are waiting to enter the specified monitor. | |
| 4015 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
| 4016 address monitor, bool doLock) { | |
| 4017 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
| 4018 "must grab Threads_lock or be at safepoint"); | |
| 4019 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
| 4020 | |
| 4021 int i = 0; | |
| 4022 { | |
| 4023 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4024 ALL_JAVA_THREADS(p) { | |
|
1410
b30a2cd5e3a2
Added methods to c1x_VMExits.cpp
Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
parents:
1320
diff
changeset
|
4025 |
|
b30a2cd5e3a2
Added methods to c1x_VMExits.cpp
Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
parents:
1320
diff
changeset
|
4026 // (tw) May we do this? |
|
b30a2cd5e3a2
Added methods to c1x_VMExits.cpp
Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
parents:
1320
diff
changeset
|
4027 //if (p->is_Compiler_thread()) continue; |
| 0 | 4028 |
| 4029 address pending = (address)p->current_pending_monitor(); | |
| 4030 if (pending == monitor) { // found a match | |
| 4031 if (i < count) result->append(p); // save the first count matches | |
| 4032 i++; | |
| 4033 } | |
| 4034 } | |
| 4035 } | |
| 4036 return result; | |
| 4037 } | |
| 4038 | |
| 4039 | |
| 4040 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
| 4041 assert(doLock || | |
| 4042 Threads_lock->owned_by_self() || | |
| 4043 SafepointSynchronize::is_at_safepoint(), | |
| 4044 "must grab Threads_lock or be at safepoint"); | |
| 4045 | |
| 4046 // NULL owner means not locked so we can skip the search | |
| 4047 if (owner == NULL) return NULL; | |
| 4048 | |
| 4049 { | |
| 4050 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4051 ALL_JAVA_THREADS(p) { | |
| 4052 // first, see if owner is the address of a Java thread | |
| 4053 if (owner == (address)p) return p; | |
| 4054 } | |
| 4055 } | |
| 4056 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
| 4057 if (UseHeavyMonitors) return NULL; | |
| 4058 | |
| 4059 // | |
| 4060 // If we didn't find a matching Java thread and we didn't force use of | |
| 4061 // heavyweight monitors, then the owner is the stack address of the | |
| 4062 // Lock Word in the owning Java thread's stack. | |
| 4063 // | |
| 4064 JavaThread* the_owner = NULL; | |
| 4065 { | |
| 4066 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4067 ALL_JAVA_THREADS(q) { | |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4068 if (q->is_lock_owned(owner)) { |
| 0 | 4069 the_owner = q; |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4070 break; |
| 0 | 4071 } |
| 4072 } | |
| 4073 } | |
| 4074 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
| 4075 return the_owner; | |
| 4076 } | |
| 4077 | |
| 4078 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
| 4079 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
| 4080 char buf[32]; | |
| 4081 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
| 4082 | |
| 4083 st->print_cr("Full thread dump %s (%s %s):", | |
| 4084 Abstract_VM_Version::vm_name(), | |
| 4085 Abstract_VM_Version::vm_release(), | |
| 4086 Abstract_VM_Version::vm_info_string() | |
| 4087 ); | |
| 4088 st->cr(); | |
| 4089 | |
| 4090 #ifndef SERIALGC | |
| 4091 // Dump concurrent locks | |
| 4092 ConcurrentLocksDump concurrent_locks; | |
| 4093 if (print_concurrent_locks) { | |
| 4094 concurrent_locks.dump_at_safepoint(); | |
| 4095 } | |
| 4096 #endif // SERIALGC | |
| 4097 | |
| 4098 ALL_JAVA_THREADS(p) { | |
| 4099 ResourceMark rm; | |
| 4100 p->print_on(st); | |
| 4101 if (print_stacks) { | |
| 4102 if (internal_format) { | |
| 4103 p->trace_stack(); | |
| 4104 } else { | |
| 4105 p->print_stack_on(st); | |
| 4106 } | |
| 4107 } | |
| 4108 st->cr(); | |
| 4109 #ifndef SERIALGC | |
| 4110 if (print_concurrent_locks) { | |
| 4111 concurrent_locks.print_locks_on(p, st); | |
| 4112 } | |
| 4113 #endif // SERIALGC | |
| 4114 } | |
| 4115 | |
| 4116 VMThread::vm_thread()->print_on(st); | |
| 4117 st->cr(); | |
| 4118 Universe::heap()->print_gc_threads_on(st); | |
| 4119 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4120 if (wt != NULL) wt->print_on(st); | |
| 4121 st->cr(); | |
| 4122 CompileBroker::print_compiler_threads_on(st); | |
| 4123 st->flush(); | |
| 4124 } | |
| 4125 | |
| 4126 // Threads::print_on_error() is called by fatal error handler. It's possible | |
| 4127 // that VM is not at safepoint and/or current thread is inside signal handler. | |
| 4128 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
| 4129 // memory (even in resource area), it might deadlock the error handler. | |
| 4130 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
| 4131 bool found_current = false; | |
| 4132 st->print_cr("Java Threads: ( => current thread )"); | |
| 4133 ALL_JAVA_THREADS(thread) { | |
| 4134 bool is_current = (current == thread); | |
| 4135 found_current = found_current || is_current; | |
| 4136 | |
| 4137 st->print("%s", is_current ? "=>" : " "); | |
| 4138 | |
| 4139 st->print(PTR_FORMAT, thread); | |
| 4140 st->print(" "); | |
| 4141 thread->print_on_error(st, buf, buflen); | |
| 4142 st->cr(); | |
| 4143 } | |
| 4144 st->cr(); | |
| 4145 | |
| 4146 st->print_cr("Other Threads:"); | |
| 4147 if (VMThread::vm_thread()) { | |
| 4148 bool is_current = (current == VMThread::vm_thread()); | |
| 4149 found_current = found_current || is_current; | |
| 4150 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
| 4151 | |
| 4152 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
| 4153 st->print(" "); | |
| 4154 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
| 4155 st->cr(); | |
| 4156 } | |
| 4157 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4158 if (wt != NULL) { | |
| 4159 bool is_current = (current == wt); | |
| 4160 found_current = found_current || is_current; | |
| 4161 st->print("%s", is_current ? "=>" : " "); | |
| 4162 | |
| 4163 st->print(PTR_FORMAT, wt); | |
| 4164 st->print(" "); | |
| 4165 wt->print_on_error(st, buf, buflen); | |
| 4166 st->cr(); | |
| 4167 } | |
| 4168 if (!found_current) { | |
| 4169 st->cr(); | |
| 4170 st->print("=>" PTR_FORMAT " (exited) ", current); | |
| 4171 current->print_on_error(st, buf, buflen); | |
| 4172 st->cr(); | |
| 4173 } | |
| 4174 } | |
| 4175 | |
| 1878 | 4176 // Internal SpinLock and Mutex |
| 4177 // Based on ParkEvent | |
| 4178 | |
| 4179 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
| 0 | 4180 // |
| 1878 | 4181 // We employ SpinLocks _only for low-contention, fixed-length |
| 4182 // short-duration critical sections where we're concerned | |
| 4183 // about native mutex_t or HotSpot Mutex:: latency. | |
| 4184 // The mux construct provides a spin-then-block mutual exclusion | |
| 4185 // mechanism. | |
| 4186 // | |
| 4187 // Testing has shown that contention on the ListLock guarding gFreeList | |
| 4188 // is common. If we implement ListLock as a simple SpinLock it's common | |
| 4189 // for the JVM to devolve to yielding with little progress. This is true | |
| 4190 // despite the fact that the critical sections protected by ListLock are | |
| 4191 // extremely short. | |
| 0 | 4192 // |
| 1878 | 4193 // TODO-FIXME: ListLock should be of type SpinLock. |
| 4194 // We should make this a 1st-class type, integrated into the lock | |
| 4195 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
| 4196 // should have sufficient padding to avoid false-sharing and excessive | |
| 4197 // cache-coherency traffic. | |
| 4198 | |
| 4199 | |
| 4200 typedef volatile int SpinLockT ; | |
| 4201 | |
| 4202 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
| 4203 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
| 4204 return ; // normal fast-path return | |
| 4205 } | |
| 4206 | |
| 4207 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
| 4208 TEVENT (SpinAcquire - ctx) ; | |
| 4209 int ctr = 0 ; | |
| 4210 int Yields = 0 ; | |
| 0 | 4211 for (;;) { |
| 1878 | 4212 while (*adr != 0) { |
| 4213 ++ctr ; | |
| 4214 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
| 4215 if (Yields > 5) { | |
| 4216 // Consider using a simple NakedSleep() instead. | |
| 4217 // Then SpinAcquire could be called by non-JVM threads | |
| 4218 Thread::current()->_ParkEvent->park(1) ; | |
| 4219 } else { | |
| 4220 os::NakedYield() ; | |
| 4221 ++Yields ; | |
| 4222 } | |
| 4223 } else { | |
| 4224 SpinPause() ; | |
| 0 | 4225 } |
| 1878 | 4226 } |
| 4227 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
| 0 | 4228 } |
| 4229 } | |
| 4230 | |
| 1878 | 4231 void Thread::SpinRelease (volatile int * adr) { |
| 4232 assert (*adr != 0, "invariant") ; | |
| 4233 OrderAccess::fence() ; // guarantee at least release consistency. | |
| 4234 // Roach-motel semantics. | |
| 4235 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
| 4236 // but prior LDs and STs within the critical section can't be allowed | |
| 4237 // to reorder or float past the ST that releases the lock. | |
| 4238 *adr = 0 ; | |
| 0 | 4239 } |
| 4240 | |
| 1878 | 4241 // muxAcquire and muxRelease: |
| 4242 // | |
| 4243 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
| 4244 // The LSB of the word is set IFF the lock is held. | |
| 4245 // The remainder of the word points to the head of a singly-linked list | |
| 4246 // of threads blocked on the lock. | |
| 4247 // | |
| 4248 // * The current implementation of muxAcquire-muxRelease uses its own | |
| 4249 // dedicated Thread._MuxEvent instance. If we're interested in | |
| 4250 // minimizing the peak number of extant ParkEvent instances then | |
| 4251 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
| 4252 // as certain invariants were satisfied. Specifically, care would need | |
| 4253 // to be taken with regards to consuming unpark() "permits". | |
| 4254 // A safe rule of thumb is that a thread would never call muxAcquire() | |
| 4255 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
| 4256 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
| 4257 // consume an unpark() permit intended for monitorenter, for instance. | |
| 4258 // One way around this would be to widen the restricted-range semaphore | |
| 4259 // implemented in park(). Another alternative would be to provide | |
| 4260 // multiple instances of the PlatformEvent() for each thread. One | |
| 4261 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
| 4262 // | |
| 4263 // * Usage: | |
| 4264 // -- Only as leaf locks | |
| 4265 // -- for short-term locking only as muxAcquire does not perform | |
| 4266 // thread state transitions. | |
| 4267 // | |
| 4268 // Alternatives: | |
| 4269 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
| 4270 // but with parking or spin-then-park instead of pure spinning. | |
| 4271 // * Use Taura-Oyama-Yonenzawa locks. | |
| 4272 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
| 4273 // (List,LockByte). Acquire will CAS the full lockword while Release | |
| 4274 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
| 4275 // acquiring threads use timers (ParkTimed) to detect and recover from | |
| 4276 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
| 4277 // boundaries by using placement-new. | |
| 4278 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
| 4279 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
| 4280 // The validity of the backlinks must be ratified before we trust the value. | |
| 4281 // If the backlinks are invalid the exiting thread must back-track through the | |
| 4282 // the forward links, which are always trustworthy. | |
| 4283 // * Add a successor indication. The LockWord is currently encoded as | |
| 4284 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
| 4285 // to provide the usual futile-wakeup optimization. | |
| 4286 // See RTStt for details. | |
| 4287 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
| 4288 // | |
| 4289 | |
| 4290 | |
| 4291 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
| 4292 enum MuxBits { LOCKBIT = 1 } ; | |
| 4293 | |
| 4294 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
| 4295 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4296 if (w == 0) return ; | |
| 4297 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4298 return ; | |
| 4299 } | |
| 4300 | |
| 4301 TEVENT (muxAcquire - Contention) ; | |
| 4302 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
| 4303 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
| 0 | 4304 for (;;) { |
| 1878 | 4305 int its = (os::is_MP() ? 100 : 0) + 1 ; |
| 4306 | |
| 4307 // Optional spin phase: spin-then-park strategy | |
| 4308 while (--its >= 0) { | |
| 4309 w = *Lock ; | |
| 4310 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4311 return ; | |
| 4312 } | |
| 4313 } | |
| 4314 | |
| 4315 Self->reset() ; | |
| 4316 Self->OnList = intptr_t(Lock) ; | |
| 4317 // The following fence() isn't _strictly necessary as the subsequent | |
| 4318 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4319 OrderAccess::fence(); | |
| 4320 for (;;) { | |
| 4321 w = *Lock ; | |
| 4322 if ((w & LOCKBIT) == 0) { | |
| 4323 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4324 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
| 4325 return ; | |
| 4326 } | |
| 4327 continue ; // Interference -- *Lock changed -- Just retry | |
| 0 | 4328 } |
| 1878 | 4329 assert (w & LOCKBIT, "invariant") ; |
| 4330 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4331 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
| 4332 } | |
| 4333 | |
| 4334 while (Self->OnList != 0) { | |
| 4335 Self->park() ; | |
| 4336 } | |
| 0 | 4337 } |
| 4338 } | |
| 4339 | |
| 1878 | 4340 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
| 4341 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4342 if (w == 0) return ; | |
| 4343 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4344 return ; | |
| 4345 } | |
| 4346 | |
| 4347 TEVENT (muxAcquire - Contention) ; | |
| 4348 ParkEvent * ReleaseAfter = NULL ; | |
| 4349 if (ev == NULL) { | |
| 4350 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
| 4351 } | |
| 4352 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
| 4353 for (;;) { | |
| 4354 guarantee (ev->OnList == 0, "invariant") ; | |
| 4355 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
| 4356 | |
| 4357 // Optional spin phase: spin-then-park strategy | |
| 4358 while (--its >= 0) { | |
| 4359 w = *Lock ; | |
| 4360 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4361 if (ReleaseAfter != NULL) { | |
| 4362 ParkEvent::Release (ReleaseAfter) ; | |
| 4363 } | |
| 4364 return ; | |
| 4365 } | |
| 4366 } | |
| 4367 | |
| 4368 ev->reset() ; | |
| 4369 ev->OnList = intptr_t(Lock) ; | |
| 4370 // The following fence() isn't _strictly necessary as the subsequent | |
| 4371 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4372 OrderAccess::fence(); | |
| 4373 for (;;) { | |
| 4374 w = *Lock ; | |
| 4375 if ((w & LOCKBIT) == 0) { | |
| 4376 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4377 ev->OnList = 0 ; | |
| 4378 // We call ::Release while holding the outer lock, thus | |
| 4379 // artificially lengthening the critical section. | |
| 4380 // Consider deferring the ::Release() until the subsequent unlock(), | |
| 4381 // after we've dropped the outer lock. | |
| 4382 if (ReleaseAfter != NULL) { | |
| 4383 ParkEvent::Release (ReleaseAfter) ; | |
| 4384 } | |
| 4385 return ; | |
| 4386 } | |
| 4387 continue ; // Interference -- *Lock changed -- Just retry | |
| 4388 } | |
| 4389 assert (w & LOCKBIT, "invariant") ; | |
| 4390 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4391 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
| 4392 } | |
| 4393 | |
| 4394 while (ev->OnList != 0) { | |
| 4395 ev->park() ; | |
| 4396 } | |
| 4397 } | |
| 4398 } | |
| 4399 | |
| 4400 // Release() must extract a successor from the list and then wake that thread. | |
| 4401 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
| 4402 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
| 4403 // Release() would : | |
| 4404 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
| 4405 // (B) Extract a successor from the private list "in-hand" | |
| 4406 // (C) attempt to CAS() the residual back into *Lock over null. | |
| 4407 // If there were any newly arrived threads and the CAS() would fail. | |
| 4408 // In that case Release() would detach the RATs, re-merge the list in-hand | |
| 4409 // with the RATs and repeat as needed. Alternately, Release() might | |
| 4410 // detach and extract a successor, but then pass the residual list to the wakee. | |
| 4411 // The wakee would be responsible for reattaching and remerging before it | |
| 4412 // competed for the lock. | |
| 4413 // | |
| 4414 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
| 4415 // multiple concurrent pushers, but only one popper or detacher. | |
| 4416 // This implementation pops from the head of the list. This is unfair, | |
| 4417 // but tends to provide excellent throughput as hot threads remain hot. | |
| 4418 // (We wake recently run threads first). | |
| 4419 | |
| 4420 void Thread::muxRelease (volatile intptr_t * Lock) { | |
| 4421 for (;;) { | |
| 4422 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
| 4423 assert (w & LOCKBIT, "invariant") ; | |
| 4424 if (w == LOCKBIT) return ; | |
| 4425 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
| 4426 assert (List != NULL, "invariant") ; | |
| 4427 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
| 4428 ParkEvent * nxt = List->ListNext ; | |
| 4429 | |
| 4430 // The following CAS() releases the lock and pops the head element. | |
| 4431 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
| 4432 continue ; | |
| 4433 } | |
| 4434 List->OnList = 0 ; | |
| 4435 OrderAccess::fence() ; | |
| 4436 List->unpark () ; | |
| 4437 return ; | |
| 4438 } | |
| 4439 } | |
| 4440 | |
| 4441 | |
| 0 | 4442 void Threads::verify() { |
| 4443 ALL_JAVA_THREADS(p) { | |
| 4444 p->verify(); | |
| 4445 } | |
| 4446 VMThread* thread = VMThread::vm_thread(); | |
| 4447 if (thread != NULL) thread->verify(); | |
| 4448 } |