Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.hpp @ 1842:6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
Summary: Under certain circumstances a safepoint could happen between a JavaThread object being created and that object being added to the Java threads list. This could cause the active field of that thread's SATB queue to get out-of-sync with respect to the other Java threads. The solution is to activate the SATB queue, when necessary, before adding the thread to the Java threads list, not when the JavaThread object is created. The changeset also includes a small fix to rename the surrogate locker thread from "Surrogate Locker Thread (CMS)" to "Surrogate Locker Thread (Concurrent GC)" since it's also used in G1.
Reviewed-by: iveresov, ysr, johnc, jcoomes
| author | tonyp |
|---|---|
| date | Fri, 01 Oct 2010 16:43:05 -0400 |
| parents | f4f596978298 |
| children | 0715f0cf171d |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2010, 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 | |
| 25 class ThreadSafepointState; | |
| 26 class ThreadProfiler; | |
| 27 | |
| 28 class JvmtiThreadState; | |
| 29 class JvmtiGetLoadedClassesClosure; | |
| 30 class ThreadStatistics; | |
| 31 class ConcurrentLocksDump; | |
| 32 class ParkEvent ; | |
| 33 | |
| 34 class ciEnv; | |
| 35 class CompileThread; | |
| 36 class CompileLog; | |
| 37 class CompileTask; | |
| 38 class CompileQueue; | |
| 39 class CompilerCounters; | |
| 40 class vframeArray; | |
| 41 | |
| 42 class DeoptResourceMark; | |
| 43 class jvmtiDeferredLocalVariableSet; | |
| 44 | |
| 45 class GCTaskQueue; | |
| 46 class ThreadClosure; | |
| 47 class IdealGraphPrinter; | |
| 48 | |
| 49 // Class hierarchy | |
| 50 // - Thread | |
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51 // - NamedThread |
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52 // - VMThread |
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53 // - ConcurrentGCThread |
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54 // - WorkerThread |
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55 // - GangWorker |
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56 // - GCTaskThread |
| 0 | 57 // - JavaThread |
| 58 // - WatcherThread | |
| 59 | |
| 60 class Thread: public ThreadShadow { | |
| 61 friend class VMStructs; | |
| 62 private: | |
| 63 // Exception handling | |
| 64 // (Note: _pending_exception and friends are in ThreadShadow) | |
| 65 //oop _pending_exception; // pending exception for current thread | |
| 66 // const char* _exception_file; // file information for exception (debugging only) | |
| 67 // int _exception_line; // line information for exception (debugging only) | |
| 68 | |
| 69 // Support for forcing alignment of thread objects for biased locking | |
| 70 void* _real_malloc_address; | |
| 71 public: | |
| 72 void* operator new(size_t size); | |
| 73 void operator delete(void* p); | |
| 74 private: | |
| 75 | |
| 76 // *************************************************************** | |
| 77 // Suspend and resume support | |
| 78 // *************************************************************** | |
| 79 // | |
| 80 // VM suspend/resume no longer exists - it was once used for various | |
| 81 // things including safepoints but was deprecated and finally removed | |
| 82 // in Java 7. Because VM suspension was considered "internal" Java-level | |
| 83 // suspension was considered "external", and this legacy naming scheme | |
| 84 // remains. | |
| 85 // | |
| 86 // External suspend/resume requests come from JVM_SuspendThread, | |
| 87 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI | |
| 88 // ResumeThread. External | |
| 89 // suspend requests cause _external_suspend to be set and external | |
| 90 // resume requests cause _external_suspend to be cleared. | |
| 91 // External suspend requests do not nest on top of other external | |
| 92 // suspend requests. The higher level APIs reject suspend requests | |
| 93 // for already suspended threads. | |
| 94 // | |
| 95 // The external_suspend | |
| 96 // flag is checked by has_special_runtime_exit_condition() and java thread | |
| 97 // will self-suspend when handle_special_runtime_exit_condition() is | |
| 98 // called. Most uses of the _thread_blocked state in JavaThreads are | |
| 99 // considered the same as being externally suspended; if the blocking | |
| 100 // condition lifts, the JavaThread will self-suspend. Other places | |
| 101 // where VM checks for external_suspend include: | |
| 102 // + mutex granting (do not enter monitors when thread is suspended) | |
| 103 // + state transitions from _thread_in_native | |
| 104 // | |
| 105 // In general, java_suspend() does not wait for an external suspend | |
| 106 // request to complete. When it returns, the only guarantee is that | |
| 107 // the _external_suspend field is true. | |
| 108 // | |
| 109 // wait_for_ext_suspend_completion() is used to wait for an external | |
| 110 // suspend request to complete. External suspend requests are usually | |
| 111 // followed by some other interface call that requires the thread to | |
| 112 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into | |
| 113 // the interface that requires quiescence, we give the JavaThread a | |
| 114 // chance to self-suspend before we need it to be quiescent. This | |
| 115 // improves overall suspend/query performance. | |
| 116 // | |
| 117 // _suspend_flags controls the behavior of java_ suspend/resume. | |
| 118 // It must be set under the protection of SR_lock. Read from the flag is | |
| 119 // OK without SR_lock as long as the value is only used as a hint. | |
| 120 // (e.g., check _external_suspend first without lock and then recheck | |
| 121 // inside SR_lock and finish the suspension) | |
| 122 // | |
| 123 // _suspend_flags is also overloaded for other "special conditions" so | |
| 124 // that a single check indicates whether any special action is needed | |
| 125 // eg. for async exceptions. | |
| 126 // ------------------------------------------------------------------- | |
| 127 // Notes: | |
| 128 // 1. The suspend/resume logic no longer uses ThreadState in OSThread | |
| 129 // but we still update its value to keep other part of the system (mainly | |
| 130 // JVMTI) happy. ThreadState is legacy code (see notes in | |
| 131 // osThread.hpp). | |
| 132 // | |
| 133 // 2. It would be more natural if set_external_suspend() is private and | |
| 134 // part of java_suspend(), but that probably would affect the suspend/query | |
| 135 // performance. Need more investigation on this. | |
| 136 // | |
| 137 | |
| 138 // suspend/resume lock: used for self-suspend | |
| 139 Monitor* _SR_lock; | |
| 140 | |
| 141 protected: | |
| 142 enum SuspendFlags { | |
| 143 // NOTE: avoid using the sign-bit as cc generates different test code | |
| 144 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 | |
| 145 | |
| 146 _external_suspend = 0x20000000U, // thread is asked to self suspend | |
| 147 _ext_suspended = 0x40000000U, // thread has self-suspended | |
| 148 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt | |
| 149 | |
| 150 _has_async_exception = 0x00000001U // there is a pending async exception | |
| 151 }; | |
| 152 | |
| 153 // various suspension related flags - atomically updated | |
| 154 // overloaded for async exception checking in check_special_condition_for_native_trans. | |
| 155 volatile uint32_t _suspend_flags; | |
| 156 | |
| 157 private: | |
| 158 int _num_nested_signal; | |
| 159 | |
| 160 public: | |
| 161 void enter_signal_handler() { _num_nested_signal++; } | |
| 162 void leave_signal_handler() { _num_nested_signal--; } | |
| 163 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } | |
| 164 | |
| 165 private: | |
| 166 // Debug tracing | |
| 167 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; | |
| 168 | |
| 169 // Active_handles points to a block of handles | |
| 170 JNIHandleBlock* _active_handles; | |
| 171 | |
| 172 // One-element thread local free list | |
| 173 JNIHandleBlock* _free_handle_block; | |
| 174 | |
| 175 // Point to the last handle mark | |
| 176 HandleMark* _last_handle_mark; | |
| 177 | |
| 178 // The parity of the last strong_roots iteration in which this thread was | |
| 179 // claimed as a task. | |
| 180 jint _oops_do_parity; | |
| 181 | |
| 182 public: | |
| 183 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } | |
| 184 HandleMark* last_handle_mark() const { return _last_handle_mark; } | |
| 185 private: | |
| 186 | |
| 187 // debug support for checking if code does allow safepoints or not | |
| 188 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on | |
| 189 // mutex, or blocking on an object synchronizer (Java locking). | |
| 190 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases | |
| 191 // If !allow_allocation(), then an assertion failure will happen during allocation | |
| 192 // (Hence, !allow_safepoint() => !allow_allocation()). | |
| 193 // | |
| 194 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. | |
| 195 // | |
| 196 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen | |
| 197 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. | |
| 198 | |
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199 // Used by SkipGCALot class. |
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200 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? |
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201 |
| 0 | 202 // Record when GC is locked out via the GC_locker mechanism |
| 203 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;) | |
| 204 | |
| 205 friend class No_Alloc_Verifier; | |
| 206 friend class No_Safepoint_Verifier; | |
| 207 friend class Pause_No_Safepoint_Verifier; | |
| 208 friend class ThreadLocalStorage; | |
| 209 friend class GC_locker; | |
| 210 | |
| 211 ThreadLocalAllocBuffer _tlab; // Thread-local eden | |
| 212 | |
| 213 int _vm_operation_started_count; // VM_Operation support | |
| 214 int _vm_operation_completed_count; // VM_Operation support | |
| 215 | |
| 216 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread | |
| 217 // is waiting to lock | |
| 218 bool _current_pending_monitor_is_from_java; // locking is from Java code | |
| 219 | |
| 220 // ObjectMonitor on which this thread called Object.wait() | |
| 221 ObjectMonitor* _current_waiting_monitor; | |
| 222 | |
| 223 // Private thread-local objectmonitor list - a simple cache organized as a SLL. | |
| 224 public: | |
| 225 ObjectMonitor * omFreeList ; | |
| 226 int omFreeCount ; // length of omFreeList | |
| 227 int omFreeProvision ; // reload chunk size | |
| 1587 | 228 ObjectMonitor * omInUseList; // SLL to track monitors in circulation |
| 229 int omInUseCount; // length of omInUseList | |
| 0 | 230 |
| 231 public: | |
| 232 enum { | |
| 233 is_definitely_current_thread = true | |
| 234 }; | |
| 235 | |
| 236 // Constructor | |
| 237 Thread(); | |
| 238 virtual ~Thread(); | |
| 239 | |
| 240 // initializtion | |
| 241 void initialize_thread_local_storage(); | |
| 242 | |
| 243 // thread entry point | |
| 244 virtual void run(); | |
| 245 | |
| 246 // Testers | |
| 247 virtual bool is_VM_thread() const { return false; } | |
| 248 virtual bool is_Java_thread() const { return false; } | |
| 249 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 250 virtual bool is_Compiler_thread() const { return false; } | |
| 251 virtual bool is_hidden_from_external_view() const { return false; } | |
| 252 virtual bool is_jvmti_agent_thread() const { return false; } | |
| 253 // True iff the thread can perform GC operations at a safepoint. | |
| 254 // Generally will be true only of VM thread and parallel GC WorkGang | |
| 255 // threads. | |
| 256 virtual bool is_GC_task_thread() const { return false; } | |
| 257 virtual bool is_Watcher_thread() const { return false; } | |
| 258 virtual bool is_ConcurrentGC_thread() const { return false; } | |
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259 virtual bool is_Named_thread() const { return false; } |
| 0 | 260 |
| 261 virtual char* name() const { return (char*)"Unknown thread"; } | |
| 262 | |
| 263 // Returns the current thread | |
| 264 static inline Thread* current(); | |
| 265 | |
| 266 // Common thread operations | |
| 267 static void set_priority(Thread* thread, ThreadPriority priority); | |
| 268 static ThreadPriority get_priority(const Thread* const thread); | |
| 269 static void start(Thread* thread); | |
| 270 static void interrupt(Thread* thr); | |
| 271 static bool is_interrupted(Thread* thr, bool clear_interrupted); | |
| 272 | |
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273 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } |
| 0 | 274 Monitor* SR_lock() const { return _SR_lock; } |
| 275 | |
| 276 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } | |
| 277 | |
| 278 void set_suspend_flag(SuspendFlags f) { | |
| 279 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
| 280 uint32_t flags; | |
| 281 do { | |
| 282 flags = _suspend_flags; | |
| 283 } | |
| 284 while (Atomic::cmpxchg((jint)(flags | f), | |
| 285 (volatile jint*)&_suspend_flags, | |
| 286 (jint)flags) != (jint)flags); | |
| 287 } | |
| 288 void clear_suspend_flag(SuspendFlags f) { | |
| 289 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
| 290 uint32_t flags; | |
| 291 do { | |
| 292 flags = _suspend_flags; | |
| 293 } | |
| 294 while (Atomic::cmpxchg((jint)(flags & ~f), | |
| 295 (volatile jint*)&_suspend_flags, | |
| 296 (jint)flags) != (jint)flags); | |
| 297 } | |
| 298 | |
| 299 void set_has_async_exception() { | |
| 300 set_suspend_flag(_has_async_exception); | |
| 301 } | |
| 302 void clear_has_async_exception() { | |
| 303 clear_suspend_flag(_has_async_exception); | |
| 304 } | |
| 305 | |
| 306 // Support for Unhandled Oop detection | |
| 307 #ifdef CHECK_UNHANDLED_OOPS | |
| 308 private: | |
| 309 UnhandledOops *_unhandled_oops; | |
| 310 public: | |
| 311 UnhandledOops* unhandled_oops() { return _unhandled_oops; } | |
| 312 // Mark oop safe for gc. It may be stack allocated but won't move. | |
| 313 void allow_unhandled_oop(oop *op) { | |
| 314 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); | |
| 315 } | |
| 316 // Clear oops at safepoint so crashes point to unhandled oop violator | |
| 317 void clear_unhandled_oops() { | |
| 318 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); | |
| 319 } | |
| 320 bool is_gc_locked_out() { return _gc_locked_out_count > 0; } | |
| 321 #endif // CHECK_UNHANDLED_OOPS | |
| 322 | |
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323 #ifndef PRODUCT |
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324 bool skip_gcalot() { return _skip_gcalot; } |
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325 void set_skip_gcalot(bool v) { _skip_gcalot = v; } |
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326 #endif |
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327 |
| 0 | 328 public: |
| 329 // Installs a pending exception to be inserted later | |
| 330 static void send_async_exception(oop thread_oop, oop java_throwable); | |
| 331 | |
| 332 // Resource area | |
| 333 ResourceArea* resource_area() const { return _resource_area; } | |
| 334 void set_resource_area(ResourceArea* area) { _resource_area = area; } | |
| 335 | |
| 336 OSThread* osthread() const { return _osthread; } | |
| 337 void set_osthread(OSThread* thread) { _osthread = thread; } | |
| 338 | |
| 339 // JNI handle support | |
| 340 JNIHandleBlock* active_handles() const { return _active_handles; } | |
| 341 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } | |
| 342 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } | |
| 343 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } | |
| 344 | |
| 345 // Internal handle support | |
| 346 HandleArea* handle_area() const { return _handle_area; } | |
| 347 void set_handle_area(HandleArea* area) { _handle_area = area; } | |
| 348 | |
| 349 // Thread-Local Allocation Buffer (TLAB) support | |
| 350 ThreadLocalAllocBuffer& tlab() { return _tlab; } | |
| 351 void initialize_tlab() { | |
| 352 if (UseTLAB) { | |
| 353 tlab().initialize(); | |
| 354 } | |
| 355 } | |
| 356 | |
| 357 // VM operation support | |
| 358 int vm_operation_ticket() { return ++_vm_operation_started_count; } | |
| 359 int vm_operation_completed_count() { return _vm_operation_completed_count; } | |
| 360 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } | |
| 361 | |
| 362 // For tracking the heavyweight monitor the thread is pending on. | |
| 363 ObjectMonitor* current_pending_monitor() { | |
| 364 return _current_pending_monitor; | |
| 365 } | |
| 366 void set_current_pending_monitor(ObjectMonitor* monitor) { | |
| 367 _current_pending_monitor = monitor; | |
| 368 } | |
| 369 void set_current_pending_monitor_is_from_java(bool from_java) { | |
| 370 _current_pending_monitor_is_from_java = from_java; | |
| 371 } | |
| 372 bool current_pending_monitor_is_from_java() { | |
| 373 return _current_pending_monitor_is_from_java; | |
| 374 } | |
| 375 | |
| 376 // For tracking the ObjectMonitor on which this thread called Object.wait() | |
| 377 ObjectMonitor* current_waiting_monitor() { | |
| 378 return _current_waiting_monitor; | |
| 379 } | |
| 380 void set_current_waiting_monitor(ObjectMonitor* monitor) { | |
| 381 _current_waiting_monitor = monitor; | |
| 382 } | |
| 383 | |
| 384 // GC support | |
| 385 // Apply "f->do_oop" to all root oops in "this". | |
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386 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames |
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387 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 388 |
| 389 // Handles the parallel case for the method below. | |
| 390 private: | |
| 391 bool claim_oops_do_par_case(int collection_parity); | |
| 392 public: | |
| 393 // Requires that "collection_parity" is that of the current strong roots | |
| 394 // iteration. If "is_par" is false, sets the parity of "this" to | |
| 395 // "collection_parity", and returns "true". If "is_par" is true, | |
| 396 // uses an atomic instruction to set the current threads parity to | |
| 397 // "collection_parity", if it is not already. Returns "true" iff the | |
| 398 // calling thread does the update, this indicates that the calling thread | |
| 399 // has claimed the thread's stack as a root groop in the current | |
| 400 // collection. | |
| 401 bool claim_oops_do(bool is_par, int collection_parity) { | |
| 402 if (!is_par) { | |
| 403 _oops_do_parity = collection_parity; | |
| 404 return true; | |
| 405 } else { | |
| 406 return claim_oops_do_par_case(collection_parity); | |
| 407 } | |
| 408 } | |
| 409 | |
| 410 // Sweeper support | |
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411 void nmethods_do(CodeBlobClosure* cf); |
| 0 | 412 |
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413 // Used by fast lock support |
| 0 | 414 virtual bool is_lock_owned(address adr) const; |
| 415 | |
| 416 // Check if address is in the stack of the thread (not just for locks). | |
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417 // Warning: the method can only be used on the running thread |
| 0 | 418 bool is_in_stack(address adr) const; |
| 419 | |
| 420 // Sets this thread as starting thread. Returns failure if thread | |
| 421 // creation fails due to lack of memory, too many threads etc. | |
| 422 bool set_as_starting_thread(); | |
| 423 | |
| 424 protected: | |
| 425 // OS data associated with the thread | |
| 426 OSThread* _osthread; // Platform-specific thread information | |
| 427 | |
| 428 // Thread local resource area for temporary allocation within the VM | |
| 429 ResourceArea* _resource_area; | |
| 430 | |
| 431 // Thread local handle area for allocation of handles within the VM | |
| 432 HandleArea* _handle_area; | |
| 433 | |
| 434 // Support for stack overflow handling, get_thread, etc. | |
| 435 address _stack_base; | |
| 436 size_t _stack_size; | |
| 437 uintptr_t _self_raw_id; // used by get_thread (mutable) | |
| 438 int _lgrp_id; | |
| 439 | |
| 440 public: | |
| 441 // Stack overflow support | |
| 442 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } | |
| 443 | |
| 444 void set_stack_base(address base) { _stack_base = base; } | |
| 445 size_t stack_size() const { return _stack_size; } | |
| 446 void set_stack_size(size_t size) { _stack_size = size; } | |
| 447 void record_stack_base_and_size(); | |
| 448 | |
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449 bool on_local_stack(address adr) const { |
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450 /* QQQ this has knowledge of direction, ought to be a stack method */ |
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451 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); |
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452 } |
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453 |
| 0 | 454 int lgrp_id() const { return _lgrp_id; } |
| 455 void set_lgrp_id(int value) { _lgrp_id = value; } | |
| 456 | |
| 457 // Printing | |
| 458 void print_on(outputStream* st) const; | |
| 459 void print() const { print_on(tty); } | |
| 460 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; | |
| 461 | |
| 462 // Debug-only code | |
| 463 | |
| 464 #ifdef ASSERT | |
| 465 private: | |
| 466 // Deadlock detection support for Mutex locks. List of locks own by thread. | |
| 467 Monitor *_owned_locks; | |
| 468 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, | |
| 469 // thus the friendship | |
| 470 friend class Mutex; | |
| 471 friend class Monitor; | |
| 472 | |
| 473 public: | |
| 474 void print_owned_locks_on(outputStream* st) const; | |
| 475 void print_owned_locks() const { print_owned_locks_on(tty); } | |
| 476 Monitor * owned_locks() const { return _owned_locks; } | |
| 477 bool owns_locks() const { return owned_locks() != NULL; } | |
| 478 bool owns_locks_but_compiled_lock() const; | |
| 479 | |
| 480 // Deadlock detection | |
| 481 bool allow_allocation() { return _allow_allocation_count == 0; } | |
| 482 #endif | |
| 483 | |
| 484 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; | |
| 485 | |
| 486 private: | |
| 487 volatile int _jvmti_env_iteration_count; | |
| 488 | |
| 489 public: | |
| 490 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } | |
| 491 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } | |
| 492 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } | |
| 493 | |
| 494 // Code generation | |
| 495 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } | |
| 496 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } | |
| 497 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } | |
| 498 | |
| 499 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } | |
| 500 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } | |
| 501 | |
| 502 #define TLAB_FIELD_OFFSET(name) \ | |
| 503 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } | |
| 504 | |
| 505 TLAB_FIELD_OFFSET(start) | |
| 506 TLAB_FIELD_OFFSET(end) | |
| 507 TLAB_FIELD_OFFSET(top) | |
| 508 TLAB_FIELD_OFFSET(pf_top) | |
| 509 TLAB_FIELD_OFFSET(size) // desired_size | |
| 510 TLAB_FIELD_OFFSET(refill_waste_limit) | |
| 511 TLAB_FIELD_OFFSET(number_of_refills) | |
| 512 TLAB_FIELD_OFFSET(fast_refill_waste) | |
| 513 TLAB_FIELD_OFFSET(slow_allocations) | |
| 514 | |
| 515 #undef TLAB_FIELD_OFFSET | |
| 516 | |
| 517 public: | |
| 518 volatile intptr_t _Stalled ; | |
| 519 volatile int _TypeTag ; | |
| 520 ParkEvent * _ParkEvent ; // for synchronized() | |
| 521 ParkEvent * _SleepEvent ; // for Thread.sleep | |
| 522 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor | |
| 523 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease | |
| 524 int NativeSyncRecursion ; // diagnostic | |
| 525 | |
| 526 volatile int _OnTrap ; // Resume-at IP delta | |
| 527 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG | |
| 528 jint _hashStateX ; // thread-specific hashCode generator state | |
| 529 jint _hashStateY ; | |
| 530 jint _hashStateZ ; | |
| 531 void * _schedctl ; | |
| 532 | |
| 533 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code | |
| 534 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); } | |
| 535 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); } | |
| 536 | |
| 537 volatile jint rng [4] ; // RNG for spin loop | |
| 538 | |
| 539 // Low-level leaf-lock primitives used to implement synchronization | |
| 540 // and native monitor-mutex infrastructure. | |
| 541 // Not for general synchronization use. | |
| 542 static void SpinAcquire (volatile int * Lock, const char * Name) ; | |
| 543 static void SpinRelease (volatile int * Lock) ; | |
| 544 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; | |
| 545 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; | |
| 546 static void muxRelease (volatile intptr_t * Lock) ; | |
| 547 | |
| 548 }; | |
| 549 | |
| 550 // Inline implementation of Thread::current() | |
| 551 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of | |
| 552 // startup. | |
| 553 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same | |
| 554 // period. This is inlined in thread_<os_family>.inline.hpp. | |
| 555 | |
| 556 inline Thread* Thread::current() { | |
| 557 #ifdef ASSERT | |
| 558 // This function is very high traffic. Define PARANOID to enable expensive | |
| 559 // asserts. | |
| 560 #ifdef PARANOID | |
| 561 // Signal handler should call ThreadLocalStorage::get_thread_slow() | |
| 562 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
| 563 assert(t != NULL && !t->is_inside_signal_handler(), | |
| 564 "Don't use Thread::current() inside signal handler"); | |
| 565 #endif | |
| 566 #endif | |
| 567 Thread* thread = ThreadLocalStorage::thread(); | |
| 568 assert(thread != NULL, "just checking"); | |
| 569 return thread; | |
| 570 } | |
| 571 | |
| 572 // Name support for threads. non-JavaThread subclasses with multiple | |
| 573 // uniquely named instances should derive from this. | |
| 574 class NamedThread: public Thread { | |
| 575 friend class VMStructs; | |
| 576 enum { | |
| 577 max_name_len = 64 | |
| 578 }; | |
| 579 private: | |
| 580 char* _name; | |
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581 // log JavaThread being processed by oops_do |
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582 JavaThread* _processed_thread; |
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583 |
| 0 | 584 public: |
| 585 NamedThread(); | |
| 586 ~NamedThread(); | |
| 587 // May only be called once per thread. | |
| 588 void set_name(const char* format, ...); | |
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589 virtual bool is_Named_thread() const { return true; } |
| 0 | 590 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } |
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591 JavaThread *processed_thread() { return _processed_thread; } |
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592 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } |
| 0 | 593 }; |
| 594 | |
| 595 // Worker threads are named and have an id of an assigned work. | |
| 596 class WorkerThread: public NamedThread { | |
| 597 private: | |
| 598 uint _id; | |
| 599 public: | |
| 600 WorkerThread() : _id(0) { } | |
| 601 void set_id(uint work_id) { _id = work_id; } | |
| 602 uint id() const { return _id; } | |
| 603 }; | |
| 604 | |
| 605 // A single WatcherThread is used for simulating timer interrupts. | |
| 606 class WatcherThread: public Thread { | |
| 607 friend class VMStructs; | |
| 608 public: | |
| 609 virtual void run(); | |
| 610 | |
| 611 private: | |
| 612 static WatcherThread* _watcher_thread; | |
| 613 | |
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614 volatile static bool _should_terminate; // updated without holding lock |
| 0 | 615 public: |
| 616 enum SomeConstants { | |
| 617 delay_interval = 10 // interrupt delay in milliseconds | |
| 618 }; | |
| 619 | |
| 620 // Constructor | |
| 621 WatcherThread(); | |
| 622 | |
| 623 // Tester | |
| 624 bool is_Watcher_thread() const { return true; } | |
| 625 | |
| 626 // Printing | |
| 627 char* name() const { return (char*)"VM Periodic Task Thread"; } | |
| 628 void print_on(outputStream* st) const; | |
| 629 void print() const { print_on(tty); } | |
| 630 | |
| 631 // Returns the single instance of WatcherThread | |
| 632 static WatcherThread* watcher_thread() { return _watcher_thread; } | |
| 633 | |
| 634 // Create and start the single instance of WatcherThread, or stop it on shutdown | |
| 635 static void start(); | |
| 636 static void stop(); | |
| 637 }; | |
| 638 | |
| 639 | |
| 640 class CompilerThread; | |
| 641 | |
| 642 typedef void (*ThreadFunction)(JavaThread*, TRAPS); | |
| 643 | |
| 644 class JavaThread: public Thread { | |
| 645 friend class VMStructs; | |
| 646 private: | |
| 647 JavaThread* _next; // The next thread in the Threads list | |
| 648 oop _threadObj; // The Java level thread object | |
| 649 | |
| 650 #ifdef ASSERT | |
| 651 private: | |
| 652 int _java_call_counter; | |
| 653 | |
| 654 public: | |
| 655 int java_call_counter() { return _java_call_counter; } | |
| 656 void inc_java_call_counter() { _java_call_counter++; } | |
| 657 void dec_java_call_counter() { | |
| 658 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); | |
| 659 _java_call_counter--; | |
| 660 } | |
| 661 private: // restore original namespace restriction | |
| 662 #endif // ifdef ASSERT | |
| 663 | |
| 664 #ifndef PRODUCT | |
| 665 public: | |
| 666 enum { | |
| 667 jump_ring_buffer_size = 16 | |
| 668 }; | |
| 669 private: // restore original namespace restriction | |
| 670 #endif | |
| 671 | |
| 672 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state | |
| 673 | |
| 674 ThreadFunction _entry_point; | |
| 675 | |
| 676 JNIEnv _jni_environment; | |
| 677 | |
| 678 // Deopt support | |
| 679 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization | |
| 680 | |
| 681 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we | |
| 682 // transition out of native | |
| 683 | |
| 684 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays | |
| 685 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped | |
| 686 // Because deoptimization is lazy we must save jvmti requests to set locals | |
| 687 // in compiled frames until we deoptimize and we have an interpreter frame. | |
| 688 // This holds the pointer to array (yeah like there might be more than one) of | |
| 689 // description of compiled vframes that have locals that need to be updated. | |
| 690 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; | |
| 691 | |
| 692 // Handshake value for fixing 6243940. We need a place for the i2c | |
| 693 // adapter to store the callee methodOop. This value is NEVER live | |
| 694 // across a gc point so it does NOT have to be gc'd | |
| 695 // The handshake is open ended since we can't be certain that it will | |
| 696 // be NULLed. This is because we rarely ever see the race and end up | |
| 697 // in handle_wrong_method which is the backend of the handshake. See | |
| 698 // code in i2c adapters and handle_wrong_method. | |
| 699 | |
| 700 methodOop _callee_target; | |
| 701 | |
| 702 // Oop results of VM runtime calls | |
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703 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved |
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704 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved |
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705 |
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706 // See ReduceInitialCardMarks: this holds the precise space interval of |
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707 // the most recent slow path allocation for which compiled code has |
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708 // elided card-marks for performance along the fast-path. |
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709 MemRegion _deferred_card_mark; |
| 0 | 710 |
| 711 MonitorChunk* _monitor_chunks; // Contains the off stack monitors | |
| 712 // allocated during deoptimization | |
| 713 // and by JNI_MonitorEnter/Exit | |
| 714 | |
| 715 // Async. requests support | |
| 716 enum AsyncRequests { | |
| 717 _no_async_condition = 0, | |
| 718 _async_exception, | |
| 719 _async_unsafe_access_error | |
| 720 }; | |
| 721 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request | |
| 722 oop _pending_async_exception; | |
| 723 | |
| 724 // Safepoint support | |
| 725 public: // Expose _thread_state for SafeFetchInt() | |
| 726 volatile JavaThreadState _thread_state; | |
| 727 private: | |
| 728 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint | |
| 729 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened | |
| 730 | |
| 731 // JavaThread termination support | |
| 732 enum TerminatedTypes { | |
| 733 _not_terminated = 0xDEAD - 2, | |
| 734 _thread_exiting, // JavaThread::exit() has been called for this thread | |
| 735 _thread_terminated, // JavaThread is removed from thread list | |
| 736 _vm_exited // JavaThread is still executing native code, but VM is terminated | |
| 737 // only VM_Exit can set _vm_exited | |
| 738 }; | |
| 739 | |
| 740 // In general a JavaThread's _terminated field transitions as follows: | |
| 741 // | |
| 742 // _not_terminated => _thread_exiting => _thread_terminated | |
| 743 // | |
| 744 // _vm_exited is a special value to cover the case of a JavaThread | |
| 745 // executing native code after the VM itself is terminated. | |
| 746 TerminatedTypes _terminated; | |
| 747 // suspend/resume support | |
| 748 volatile bool _suspend_equivalent; // Suspend equivalent condition | |
| 749 jint _in_deopt_handler; // count of deoptimization | |
| 750 // handlers thread is in | |
| 751 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access | |
| 752 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was | |
| 753 // never locked) when throwing an exception. Used by interpreter only. | |
| 754 | |
| 755 // Flag to mark a JNI thread in the process of attaching - See CR 6404306 | |
| 756 // This flag is never set true other than at construction, and in that case | |
| 757 // is shortly thereafter set false | |
| 758 volatile bool _is_attaching; | |
| 759 | |
| 760 public: | |
| 761 // State of the stack guard pages for this thread. | |
| 762 enum StackGuardState { | |
| 763 stack_guard_unused, // not needed | |
| 764 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow | |
| 765 stack_guard_enabled // enabled | |
| 766 }; | |
| 767 | |
| 768 private: | |
| 769 | |
| 770 StackGuardState _stack_guard_state; | |
| 771 | |
| 772 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is | |
| 773 // used to temp. parsing values into and out of the runtime system during exception handling for compiled | |
| 774 // code) | |
| 775 volatile oop _exception_oop; // Exception thrown in compiled code | |
| 776 volatile address _exception_pc; // PC where exception happened | |
| 777 volatile address _exception_handler_pc; // PC for handler of exception | |
| 778 volatile int _exception_stack_size; // Size of frame where exception happened | |
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779 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. |
| 0 | 780 |
| 781 // support for compilation | |
| 782 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible) | |
| 783 | |
| 784 // support for JNI critical regions | |
| 785 jint _jni_active_critical; // count of entries into JNI critical region | |
| 786 | |
| 787 // For deadlock detection. | |
| 788 int _depth_first_number; | |
| 789 | |
| 790 // JVMTI PopFrame support | |
| 791 // This is set to popframe_pending to signal that top Java frame should be popped immediately | |
| 792 int _popframe_condition; | |
| 793 | |
| 794 #ifndef PRODUCT | |
| 795 int _jmp_ring_index; | |
| 796 struct { | |
| 797 // We use intptr_t instead of address so debugger doesn't try and display strings | |
| 798 intptr_t _target; | |
| 799 intptr_t _instruction; | |
| 800 const char* _file; | |
| 801 int _line; | |
| 802 } _jmp_ring[ jump_ring_buffer_size ]; | |
| 803 #endif /* PRODUCT */ | |
| 804 | |
| 342 | 805 #ifndef SERIALGC |
| 806 // Support for G1 barriers | |
| 807 | |
| 808 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. | |
| 809 // Set of all such queues. | |
| 810 static SATBMarkQueueSet _satb_mark_queue_set; | |
| 811 | |
| 812 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. | |
| 813 // Set of all such queues. | |
| 814 static DirtyCardQueueSet _dirty_card_queue_set; | |
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816 void flush_barrier_queues(); |
| 342 | 817 #endif // !SERIALGC |
| 818 | |
| 0 | 819 friend class VMThread; |
| 820 friend class ThreadWaitTransition; | |
| 821 friend class VM_Exit; | |
| 822 | |
| 823 void initialize(); // Initialized the instance variables | |
| 824 | |
| 825 public: | |
| 826 // Constructor | |
| 827 JavaThread(bool is_attaching = false); // for main thread and JNI attached threads | |
| 828 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); | |
| 829 ~JavaThread(); | |
| 830 | |
| 831 #ifdef ASSERT | |
| 832 // verify this JavaThread hasn't be published in the Threads::list yet | |
| 833 void verify_not_published(); | |
| 834 #endif | |
| 835 | |
| 836 //JNI functiontable getter/setter for JVMTI jni function table interception API. | |
| 837 void set_jni_functions(struct JNINativeInterface_* functionTable) { | |
| 838 _jni_environment.functions = functionTable; | |
| 839 } | |
| 840 struct JNINativeInterface_* get_jni_functions() { | |
| 841 return (struct JNINativeInterface_ *)_jni_environment.functions; | |
| 842 } | |
| 843 | |
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844 // This function is called at thread creation to allow |
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845 // platform specific thread variables to be initialized. |
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846 void cache_global_variables(); |
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847 |
| 0 | 848 // Executes Shutdown.shutdown() |
| 849 void invoke_shutdown_hooks(); | |
| 850 | |
| 851 // Cleanup on thread exit | |
| 852 enum ExitType { | |
| 853 normal_exit, | |
| 854 jni_detach | |
| 855 }; | |
| 856 void exit(bool destroy_vm, ExitType exit_type = normal_exit); | |
| 857 | |
| 858 void cleanup_failed_attach_current_thread(); | |
| 859 | |
| 860 // Testers | |
| 861 virtual bool is_Java_thread() const { return true; } | |
| 862 | |
| 863 // compilation | |
| 864 void set_is_compiling(bool f) { _is_compiling = f; } | |
| 865 bool is_compiling() const { return _is_compiling; } | |
| 866 | |
| 867 // Thread chain operations | |
| 868 JavaThread* next() const { return _next; } | |
| 869 void set_next(JavaThread* p) { _next = p; } | |
| 870 | |
| 871 // Thread oop. threadObj() can be NULL for initial JavaThread | |
| 872 // (or for threads attached via JNI) | |
| 873 oop threadObj() const { return _threadObj; } | |
| 874 void set_threadObj(oop p) { _threadObj = p; } | |
| 875 | |
| 876 ThreadPriority java_priority() const; // Read from threadObj() | |
| 877 | |
| 878 // Prepare thread and add to priority queue. If a priority is | |
| 879 // not specified, use the priority of the thread object. Threads_lock | |
| 880 // must be held while this function is called. | |
| 881 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); | |
| 882 | |
| 883 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } | |
| 884 address saved_exception_pc() { return _saved_exception_pc; } | |
| 885 | |
| 886 | |
| 887 ThreadFunction entry_point() const { return _entry_point; } | |
| 888 | |
| 889 // Allocates a new Java level thread object for this thread. thread_name may be NULL. | |
| 890 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); | |
| 891 | |
| 892 // Last frame anchor routines | |
| 893 | |
| 894 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } | |
| 895 | |
| 896 // last_Java_sp | |
| 897 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } | |
| 898 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } | |
| 899 | |
| 900 // last_Java_pc | |
| 901 | |
| 902 address last_Java_pc(void) { return _anchor.last_Java_pc(); } | |
| 903 | |
| 904 // Safepoint support | |
| 905 JavaThreadState thread_state() const { return _thread_state; } | |
| 906 void set_thread_state(JavaThreadState s) { _thread_state=s; } | |
| 907 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } | |
| 908 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } | |
| 909 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } | |
| 910 | |
| 911 // thread has called JavaThread::exit() or is terminated | |
| 912 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } | |
| 913 // thread is terminated (no longer on the threads list); we compare | |
| 914 // against the two non-terminated values so that a freed JavaThread | |
| 915 // will also be considered terminated. | |
| 916 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } | |
| 917 void set_terminated(TerminatedTypes t) { _terminated = t; } | |
| 918 // special for Threads::remove() which is static: | |
| 919 void set_terminated_value() { _terminated = _thread_terminated; } | |
| 920 void block_if_vm_exited(); | |
| 921 | |
| 922 bool doing_unsafe_access() { return _doing_unsafe_access; } | |
| 923 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } | |
| 924 | |
| 925 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } | |
| 926 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } | |
| 927 | |
| 928 | |
| 929 // Suspend/resume support for JavaThread | |
| 930 | |
| 931 private: | |
| 932 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } | |
| 933 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } | |
| 934 | |
| 935 public: | |
| 936 void java_suspend(); | |
| 937 void java_resume(); | |
| 938 int java_suspend_self(); | |
| 939 | |
| 940 void check_and_wait_while_suspended() { | |
| 941 assert(JavaThread::current() == this, "sanity check"); | |
| 942 | |
| 943 bool do_self_suspend; | |
| 944 do { | |
| 945 // were we externally suspended while we were waiting? | |
| 946 do_self_suspend = handle_special_suspend_equivalent_condition(); | |
| 947 if (do_self_suspend) { | |
| 948 // don't surprise the thread that suspended us by returning | |
| 949 java_suspend_self(); | |
| 950 set_suspend_equivalent(); | |
| 951 } | |
| 952 } while (do_self_suspend); | |
| 953 } | |
| 954 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); | |
| 955 // Check for async exception in addition to safepoint and suspend request. | |
| 956 static void check_special_condition_for_native_trans(JavaThread *thread); | |
| 957 | |
| 958 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); | |
| 959 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { | |
| 960 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 961 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 962 // SR_lock to allow the thread to reach a stable thread state if | |
| 963 // it is currently in a transient thread state. | |
| 964 return is_ext_suspend_completed(false /*!called_by_wait */, | |
| 965 SuspendRetryDelay, bits); | |
| 966 } | |
| 967 | |
| 968 // We cannot allow wait_for_ext_suspend_completion() to run forever or | |
| 969 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally | |
| 970 // passed as the count and delay parameters. Experiments with specific | |
| 971 // calls to wait_for_ext_suspend_completion() can be done by passing | |
| 972 // other values in the code. Experiments with all calls can be done | |
| 973 // via the appropriate -XX options. | |
| 974 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); | |
| 975 | |
| 976 void set_external_suspend() { set_suspend_flag (_external_suspend); } | |
| 977 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } | |
| 978 | |
| 979 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } | |
| 980 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } | |
| 981 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } | |
| 982 | |
| 983 bool is_external_suspend() const { | |
| 984 return (_suspend_flags & _external_suspend) != 0; | |
| 985 } | |
| 986 // Whenever a thread transitions from native to vm/java it must suspend | |
| 987 // if external|deopt suspend is present. | |
| 988 bool is_suspend_after_native() const { | |
| 989 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; | |
| 990 } | |
| 991 | |
| 992 // external suspend request is completed | |
| 993 bool is_ext_suspended() const { | |
| 994 return (_suspend_flags & _ext_suspended) != 0; | |
| 995 } | |
| 996 | |
| 997 bool is_external_suspend_with_lock() const { | |
| 998 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 999 return is_external_suspend(); | |
| 1000 } | |
| 1001 | |
| 1002 // Special method to handle a pending external suspend request | |
| 1003 // when a suspend equivalent condition lifts. | |
| 1004 bool handle_special_suspend_equivalent_condition() { | |
| 1005 assert(is_suspend_equivalent(), | |
| 1006 "should only be called in a suspend equivalence condition"); | |
| 1007 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1008 bool ret = is_external_suspend(); | |
| 1009 if (!ret) { | |
| 1010 // not about to self-suspend so clear suspend equivalence | |
| 1011 clear_suspend_equivalent(); | |
| 1012 } | |
| 1013 // implied else: | |
| 1014 // We have a pending external suspend request so we leave the | |
| 1015 // suspend_equivalent flag set until java_suspend_self() sets | |
| 1016 // the ext_suspended flag and clears the suspend_equivalent | |
| 1017 // flag. This insures that wait_for_ext_suspend_completion() | |
| 1018 // will return consistent values. | |
| 1019 return ret; | |
| 1020 } | |
| 1021 | |
| 1022 // utility methods to see if we are doing some kind of suspension | |
| 1023 bool is_being_ext_suspended() const { | |
| 1024 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1025 return is_ext_suspended() || is_external_suspend(); | |
| 1026 } | |
| 1027 | |
| 1028 bool is_suspend_equivalent() const { return _suspend_equivalent; } | |
| 1029 | |
| 1030 void set_suspend_equivalent() { _suspend_equivalent = true; }; | |
| 1031 void clear_suspend_equivalent() { _suspend_equivalent = false; }; | |
| 1032 | |
| 1033 // Thread.stop support | |
| 1034 void send_thread_stop(oop throwable); | |
| 1035 AsyncRequests clear_special_runtime_exit_condition() { | |
| 1036 AsyncRequests x = _special_runtime_exit_condition; | |
| 1037 _special_runtime_exit_condition = _no_async_condition; | |
| 1038 return x; | |
| 1039 } | |
| 1040 | |
| 1041 // Are any async conditions present? | |
| 1042 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } | |
| 1043 | |
| 1044 void check_and_handle_async_exceptions(bool check_unsafe_error = true); | |
| 1045 | |
| 1046 // these next two are also used for self-suspension and async exception support | |
| 1047 void handle_special_runtime_exit_condition(bool check_asyncs = true); | |
| 1048 | |
| 1049 // Return true if JavaThread has an asynchronous condition or | |
| 1050 // if external suspension is requested. | |
| 1051 bool has_special_runtime_exit_condition() { | |
| 1052 // We call is_external_suspend() last since external suspend should | |
| 1053 // be less common. Because we don't use is_external_suspend_with_lock | |
| 1054 // it is possible that we won't see an asynchronous external suspend | |
| 1055 // request that has just gotten started, i.e., SR_lock grabbed but | |
| 1056 // _external_suspend field change either not made yet or not visible | |
| 1057 // yet. However, this is okay because the request is asynchronous and | |
| 1058 // we will see the new flag value the next time through. It's also | |
| 1059 // possible that the external suspend request is dropped after | |
| 1060 // we have checked is_external_suspend(), we will recheck its value | |
| 1061 // under SR_lock in java_suspend_self(). | |
| 1062 return (_special_runtime_exit_condition != _no_async_condition) || | |
| 1063 is_external_suspend() || is_deopt_suspend(); | |
| 1064 } | |
| 1065 | |
| 1066 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } | |
| 1067 | |
| 1068 void set_pending_async_exception(oop e) { | |
| 1069 _pending_async_exception = e; | |
| 1070 _special_runtime_exit_condition = _async_exception; | |
| 1071 set_has_async_exception(); | |
| 1072 } | |
| 1073 | |
| 1074 // Fast-locking support | |
| 1075 bool is_lock_owned(address adr) const; | |
| 1076 | |
| 1077 // Accessors for vframe array top | |
| 1078 // The linked list of vframe arrays are sorted on sp. This means when we | |
| 1079 // unpack the head must contain the vframe array to unpack. | |
| 1080 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } | |
| 1081 vframeArray* vframe_array_head() const { return _vframe_array_head; } | |
| 1082 | |
| 1083 // Side structure for defering update of java frame locals until deopt occurs | |
| 1084 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } | |
| 1085 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } | |
| 1086 | |
| 1087 // These only really exist to make debugging deopt problems simpler | |
| 1088 | |
| 1089 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } | |
| 1090 vframeArray* vframe_array_last() const { return _vframe_array_last; } | |
| 1091 | |
| 1092 // The special resourceMark used during deoptimization | |
| 1093 | |
| 1094 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } | |
| 1095 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } | |
| 1096 | |
| 1097 intptr_t* must_deopt_id() { return _must_deopt_id; } | |
| 1098 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } | |
| 1099 void clear_must_deopt_id() { _must_deopt_id = NULL; } | |
| 1100 | |
| 1101 methodOop callee_target() const { return _callee_target; } | |
| 1102 void set_callee_target (methodOop x) { _callee_target = x; } | |
| 1103 | |
| 1104 // Oop results of vm runtime calls | |
| 1105 oop vm_result() const { return _vm_result; } | |
| 1106 void set_vm_result (oop x) { _vm_result = x; } | |
| 1107 | |
| 1108 oop vm_result_2() const { return _vm_result_2; } | |
| 1109 void set_vm_result_2 (oop x) { _vm_result_2 = x; } | |
| 1110 | |
|
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1111 MemRegion deferred_card_mark() const { return _deferred_card_mark; } |
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1112 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } |
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1113 |
| 0 | 1114 // Exception handling for compiled methods |
| 1115 oop exception_oop() const { return _exception_oop; } | |
| 1116 int exception_stack_size() const { return _exception_stack_size; } | |
| 1117 address exception_pc() const { return _exception_pc; } | |
| 1118 address exception_handler_pc() const { return _exception_handler_pc; } | |
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1119 bool is_method_handle_return() const { return _is_method_handle_return == 1; } |
| 0 | 1120 |
| 1121 void set_exception_oop(oop o) { _exception_oop = o; } | |
| 1122 void set_exception_pc(address a) { _exception_pc = a; } | |
| 1123 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } | |
| 1124 void set_exception_stack_size(int size) { _exception_stack_size = size; } | |
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1125 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } |
| 0 | 1126 |
| 1127 // Stack overflow support | |
| 1128 inline size_t stack_available(address cur_sp); | |
| 1129 address stack_yellow_zone_base() | |
| 1130 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } | |
| 1131 size_t stack_yellow_zone_size() | |
| 1132 { return StackYellowPages * os::vm_page_size(); } | |
| 1133 address stack_red_zone_base() | |
| 1134 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } | |
| 1135 size_t stack_red_zone_size() | |
| 1136 { return StackRedPages * os::vm_page_size(); } | |
| 1137 bool in_stack_yellow_zone(address a) | |
| 1138 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } | |
| 1139 bool in_stack_red_zone(address a) | |
| 1140 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } | |
| 1141 | |
| 1142 void create_stack_guard_pages(); | |
| 1143 void remove_stack_guard_pages(); | |
| 1144 | |
| 1145 void enable_stack_yellow_zone(); | |
| 1146 void disable_stack_yellow_zone(); | |
| 1147 void enable_stack_red_zone(); | |
| 1148 void disable_stack_red_zone(); | |
| 1149 | |
| 1150 inline bool stack_yellow_zone_disabled(); | |
| 1151 inline bool stack_yellow_zone_enabled(); | |
| 1152 | |
| 1153 // Attempt to reguard the stack after a stack overflow may have occurred. | |
| 1154 // Returns true if (a) guard pages are not needed on this thread, (b) the | |
| 1155 // pages are already guarded, or (c) the pages were successfully reguarded. | |
| 1156 // Returns false if there is not enough stack space to reguard the pages, in | |
| 1157 // which case the caller should unwind a frame and try again. The argument | |
| 1158 // should be the caller's (approximate) sp. | |
| 1159 bool reguard_stack(address cur_sp); | |
| 1160 // Similar to above but see if current stackpoint is out of the guard area | |
| 1161 // and reguard if possible. | |
| 1162 bool reguard_stack(void); | |
| 1163 | |
| 1164 // Misc. accessors/mutators | |
| 1165 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } | |
| 1166 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } | |
| 1167 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } | |
| 1168 | |
| 1169 #ifndef PRODUCT | |
| 1170 void record_jump(address target, address instr, const char* file, int line); | |
| 1171 #endif /* PRODUCT */ | |
| 1172 | |
| 1173 // For assembly stub generation | |
| 1174 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } | |
| 1175 #ifndef PRODUCT | |
| 1176 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } | |
| 1177 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } | |
| 1178 #endif /* PRODUCT */ | |
| 1179 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } | |
| 1180 static ByteSize last_Java_sp_offset() { | |
| 1181 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); | |
| 1182 } | |
| 1183 static ByteSize last_Java_pc_offset() { | |
| 1184 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); | |
| 1185 } | |
| 1186 static ByteSize frame_anchor_offset() { | |
| 1187 return byte_offset_of(JavaThread, _anchor); | |
| 1188 } | |
| 1189 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } | |
| 1190 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } | |
| 1191 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } | |
| 1192 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } | |
| 1193 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } | |
| 1194 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } | |
| 1195 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } | |
| 1196 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } | |
| 1197 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } | |
| 1198 static ByteSize exception_stack_size_offset() { return byte_offset_of(JavaThread, _exception_stack_size); } | |
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1199 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } |
| 0 | 1200 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } |
| 1201 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } | |
| 1202 | |
| 1203 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } | |
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1204 static ByteSize should_post_on_exceptions_flag_offset() { |
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1205 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); |
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1206 } |
| 0 | 1207 |
| 342 | 1208 #ifndef SERIALGC |
| 1209 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } | |
| 1210 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } | |
| 1211 #endif // !SERIALGC | |
| 1212 | |
| 0 | 1213 // Returns the jni environment for this thread |
| 1214 JNIEnv* jni_environment() { return &_jni_environment; } | |
| 1215 | |
| 1216 static JavaThread* thread_from_jni_environment(JNIEnv* env) { | |
| 1217 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); | |
| 1218 // Only return NULL if thread is off the thread list; starting to | |
| 1219 // exit should not return NULL. | |
| 1220 if (thread_from_jni_env->is_terminated()) { | |
| 1221 thread_from_jni_env->block_if_vm_exited(); | |
| 1222 return NULL; | |
| 1223 } else { | |
| 1224 return thread_from_jni_env; | |
| 1225 } | |
| 1226 } | |
| 1227 | |
| 1228 // JNI critical regions. These can nest. | |
| 1229 bool in_critical() { return _jni_active_critical > 0; } | |
| 1230 void enter_critical() { assert(Thread::current() == this, | |
| 1231 "this must be current thread"); | |
| 1232 _jni_active_critical++; } | |
| 1233 void exit_critical() { assert(Thread::current() == this, | |
| 1234 "this must be current thread"); | |
| 1235 _jni_active_critical--; | |
| 1236 assert(_jni_active_critical >= 0, | |
| 1237 "JNI critical nesting problem?"); } | |
| 1238 | |
| 1239 // For deadlock detection | |
| 1240 int depth_first_number() { return _depth_first_number; } | |
| 1241 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } | |
| 1242 | |
| 1243 private: | |
| 1244 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } | |
| 1245 | |
| 1246 public: | |
| 1247 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } | |
| 1248 void add_monitor_chunk(MonitorChunk* chunk); | |
| 1249 void remove_monitor_chunk(MonitorChunk* chunk); | |
| 1250 bool in_deopt_handler() const { return _in_deopt_handler > 0; } | |
| 1251 void inc_in_deopt_handler() { _in_deopt_handler++; } | |
| 1252 void dec_in_deopt_handler() { | |
| 1253 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); | |
| 1254 if (_in_deopt_handler > 0) { // robustness | |
| 1255 _in_deopt_handler--; | |
| 1256 } | |
| 1257 } | |
| 1258 | |
| 1259 private: | |
| 1260 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } | |
| 1261 | |
| 1262 public: | |
| 1263 | |
| 1264 // Frame iteration; calls the function f for all frames on the stack | |
| 1265 void frames_do(void f(frame*, const RegisterMap*)); | |
| 1266 | |
| 1267 // Memory operations | |
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1268 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1269 |
| 1270 // Sweeper operations | |
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1271 void nmethods_do(CodeBlobClosure* cf); |
| 0 | 1272 |
| 1273 // Memory management operations | |
| 1274 void gc_epilogue(); | |
| 1275 void gc_prologue(); | |
| 1276 | |
| 1277 // Misc. operations | |
| 1278 char* name() const { return (char*)get_thread_name(); } | |
| 1279 void print_on(outputStream* st) const; | |
| 1280 void print() const { print_on(tty); } | |
| 1281 void print_value(); | |
| 1282 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; | |
| 1283 void print_thread_state() const PRODUCT_RETURN; | |
| 1284 void print_on_error(outputStream* st, char* buf, int buflen) const; | |
| 1285 void verify(); | |
| 1286 const char* get_thread_name() const; | |
| 1287 private: | |
| 1288 // factor out low-level mechanics for use in both normal and error cases | |
| 1289 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; | |
| 1290 public: | |
| 1291 const char* get_threadgroup_name() const; | |
| 1292 const char* get_parent_name() const; | |
| 1293 | |
| 1294 // Accessing frames | |
| 1295 frame last_frame() { | |
| 1296 _anchor.make_walkable(this); | |
| 1297 return pd_last_frame(); | |
| 1298 } | |
| 1299 javaVFrame* last_java_vframe(RegisterMap* reg_map); | |
| 1300 | |
| 1301 // Returns method at 'depth' java or native frames down the stack | |
| 1302 // Used for security checks | |
| 1303 klassOop security_get_caller_class(int depth); | |
| 1304 | |
| 1305 // Print stack trace in external format | |
| 1306 void print_stack_on(outputStream* st); | |
| 1307 void print_stack() { print_stack_on(tty); } | |
| 1308 | |
| 1309 // Print stack traces in various internal formats | |
| 1310 void trace_stack() PRODUCT_RETURN; | |
| 1311 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; | |
| 1312 void trace_frames() PRODUCT_RETURN; | |
| 1313 | |
| 1314 // Returns the number of stack frames on the stack | |
| 1315 int depth() const; | |
| 1316 | |
| 1317 // Function for testing deoptimization | |
| 1318 void deoptimize(); | |
| 1319 void make_zombies(); | |
| 1320 | |
| 1321 void deoptimized_wrt_marked_nmethods(); | |
| 1322 | |
| 1323 // Profiling operation (see fprofile.cpp) | |
| 1324 public: | |
| 1325 bool profile_last_Java_frame(frame* fr); | |
| 1326 | |
| 1327 private: | |
| 1328 ThreadProfiler* _thread_profiler; | |
| 1329 private: | |
| 1330 friend class FlatProfiler; // uses both [gs]et_thread_profiler. | |
| 1331 friend class FlatProfilerTask; // uses get_thread_profiler. | |
| 1332 friend class ThreadProfilerMark; // uses get_thread_profiler. | |
| 1333 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } | |
| 1334 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { | |
| 1335 ThreadProfiler* result = _thread_profiler; | |
| 1336 _thread_profiler = tp; | |
| 1337 return result; | |
| 1338 } | |
| 1339 | |
| 1340 // Static operations | |
| 1341 public: | |
| 1342 // Returns the running thread as a JavaThread | |
| 1343 static inline JavaThread* current(); | |
| 1344 | |
| 1345 // Returns the active Java thread. Do not use this if you know you are calling | |
| 1346 // from a JavaThread, as it's slower than JavaThread::current. If called from | |
| 1347 // the VMThread, it also returns the JavaThread that instigated the VMThread's | |
| 1348 // operation. You may not want that either. | |
| 1349 static JavaThread* active(); | |
| 1350 | |
| 1351 inline CompilerThread* as_CompilerThread(); | |
| 1352 | |
| 1353 public: | |
| 1354 virtual void run(); | |
| 1355 void thread_main_inner(); | |
| 1356 | |
| 1357 private: | |
| 1358 // PRIVILEGED STACK | |
| 1359 PrivilegedElement* _privileged_stack_top; | |
| 1360 GrowableArray<oop>* _array_for_gc; | |
| 1361 public: | |
| 1362 | |
| 1363 // Returns the privileged_stack information. | |
| 1364 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } | |
| 1365 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } | |
| 1366 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } | |
| 1367 | |
| 1368 public: | |
| 1369 // Thread local information maintained by JVMTI. | |
| 1370 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } | |
|
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1371 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() |
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1372 // getter is used to get this JavaThread's JvmtiThreadState if it has |
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1373 // one which means NULL can be returned. JvmtiThreadState::state_for() |
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1374 // is used to get the specified JavaThread's JvmtiThreadState if it has |
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1375 // one or it allocates a new JvmtiThreadState for the JavaThread and |
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1376 // returns it. JvmtiThreadState::state_for() will return NULL only if |
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1377 // the specified JavaThread is exiting. |
| 0 | 1378 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
| 1379 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } | |
| 1380 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } | |
| 1381 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } | |
| 1382 | |
| 1383 // JVMTI PopFrame support | |
| 1384 // Setting and clearing popframe_condition | |
| 1385 // All of these enumerated values are bits. popframe_pending | |
| 1386 // indicates that a PopFrame() has been requested and not yet been | |
| 1387 // completed. popframe_processing indicates that that PopFrame() is in | |
| 1388 // the process of being completed. popframe_force_deopt_reexecution_bit | |
| 1389 // indicates that special handling is required when returning to a | |
| 1390 // deoptimized caller. | |
| 1391 enum PopCondition { | |
| 1392 popframe_inactive = 0x00, | |
| 1393 popframe_pending_bit = 0x01, | |
| 1394 popframe_processing_bit = 0x02, | |
| 1395 popframe_force_deopt_reexecution_bit = 0x04 | |
| 1396 }; | |
| 1397 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } | |
| 1398 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } | |
| 1399 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } | |
| 1400 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } | |
| 1401 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } | |
| 1402 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } | |
| 1403 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } | |
| 1404 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } | |
| 1405 #ifdef CC_INTERP | |
| 1406 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } | |
| 1407 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } | |
| 1408 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } | |
| 1409 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } | |
| 1410 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } | |
| 1411 #endif | |
| 1412 | |
| 1413 private: | |
| 1414 // Saved incoming arguments to popped frame. | |
| 1415 // Used only when popped interpreted frame returns to deoptimized frame. | |
| 1416 void* _popframe_preserved_args; | |
| 1417 int _popframe_preserved_args_size; | |
| 1418 | |
| 1419 public: | |
| 1420 void popframe_preserve_args(ByteSize size_in_bytes, void* start); | |
| 1421 void* popframe_preserved_args(); | |
| 1422 ByteSize popframe_preserved_args_size(); | |
| 1423 WordSize popframe_preserved_args_size_in_words(); | |
| 1424 void popframe_free_preserved_args(); | |
| 1425 | |
| 1426 | |
| 1427 private: | |
| 1428 JvmtiThreadState *_jvmti_thread_state; | |
| 1429 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; | |
| 1430 | |
| 1431 // Used by the interpreter in fullspeed mode for frame pop, method | |
| 1432 // entry, method exit and single stepping support. This field is | |
| 1433 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. | |
| 1434 // It can be set to zero asynchronously (i.e., without a VM operation | |
| 1435 // or a lock) so we have to be very careful. | |
| 1436 int _interp_only_mode; | |
| 1437 | |
| 1438 public: | |
| 1439 // used by the interpreter for fullspeed debugging support (see above) | |
| 1440 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } | |
| 1441 bool is_interp_only_mode() { return (_interp_only_mode != 0); } | |
| 1442 int get_interp_only_mode() { return _interp_only_mode; } | |
| 1443 void increment_interp_only_mode() { ++_interp_only_mode; } | |
| 1444 void decrement_interp_only_mode() { --_interp_only_mode; } | |
| 1445 | |
|
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1446 // support for cached flag that indicates whether exceptions need to be posted for this thread |
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1447 // if this is false, we can avoid deoptimizing when events are thrown |
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1448 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything |
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1449 private: |
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1450 int _should_post_on_exceptions_flag; |
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1451 |
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1452 public: |
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1453 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } |
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1454 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } |
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1455 |
| 0 | 1456 private: |
| 1457 ThreadStatistics *_thread_stat; | |
| 1458 | |
| 1459 public: | |
| 1460 ThreadStatistics* get_thread_stat() const { return _thread_stat; } | |
| 1461 | |
| 1462 // Return a blocker object for which this thread is blocked parking. | |
| 1463 oop current_park_blocker(); | |
| 1464 | |
| 1465 private: | |
| 1466 static size_t _stack_size_at_create; | |
| 1467 | |
| 1468 public: | |
| 1469 static inline size_t stack_size_at_create(void) { | |
| 1470 return _stack_size_at_create; | |
| 1471 } | |
| 1472 static inline void set_stack_size_at_create(size_t value) { | |
| 1473 _stack_size_at_create = value; | |
| 1474 } | |
| 1475 | |
| 342 | 1476 #ifndef SERIALGC |
| 1477 // SATB marking queue support | |
| 1478 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } | |
| 1479 static SATBMarkQueueSet& satb_mark_queue_set() { | |
| 1480 return _satb_mark_queue_set; | |
| 1481 } | |
| 1482 | |
| 1483 // Dirty card queue support | |
| 1484 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } | |
| 1485 static DirtyCardQueueSet& dirty_card_queue_set() { | |
| 1486 return _dirty_card_queue_set; | |
| 1487 } | |
| 1488 #endif // !SERIALGC | |
| 1489 | |
|
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1490 // This method initializes the SATB and dirty card queues before a |
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1491 // JavaThread is added to the Java thread list. Right now, we don't |
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1492 // have to do anything to the dirty card queue (it should have been |
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1493 // activated when the thread was created), but we have to activate |
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1494 // the SATB queue if the thread is created while a marking cycle is |
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1495 // in progress. The activation / de-activation of the SATB queues at |
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1496 // the beginning / end of a marking cycle is done during safepoints |
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1497 // so we have to make sure this method is called outside one to be |
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1498 // able to safely read the active field of the SATB queue set. Right |
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1499 // now, it is called just before the thread is added to the Java |
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1500 // thread list in the Threads::add() method. That method is holding |
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1501 // the Threads_lock which ensures we are outside a safepoint. We |
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1502 // cannot do the obvious and set the active field of the SATB queue |
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1503 // when the thread is created given that, in some cases, safepoints |
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1504 // might happen between the JavaThread constructor being called and the |
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1505 // thread being added to the Java thread list (an example of this is |
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1506 // when the structure for the DestroyJavaVM thread is created). |
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1507 #ifndef SERIALGC |
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1508 void initialize_queues(); |
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1509 #else // !SERIALGC |
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1510 void initialize_queues() { } |
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1511 #endif // !SERIALGC |
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1512 |
| 0 | 1513 // Machine dependent stuff |
| 1514 #include "incls/_thread_pd.hpp.incl" | |
| 1515 | |
| 1516 public: | |
| 1517 void set_blocked_on_compilation(bool value) { | |
| 1518 _blocked_on_compilation = value; | |
| 1519 } | |
| 1520 | |
| 1521 bool blocked_on_compilation() { | |
| 1522 return _blocked_on_compilation; | |
| 1523 } | |
| 1524 protected: | |
| 1525 bool _blocked_on_compilation; | |
| 1526 | |
| 1527 | |
| 1528 // JSR166 per-thread parker | |
| 1529 private: | |
| 1530 Parker* _parker; | |
| 1531 public: | |
| 1532 Parker* parker() { return _parker; } | |
| 1533 | |
| 1534 // Biased locking support | |
| 1535 private: | |
| 1536 GrowableArray<MonitorInfo*>* _cached_monitor_info; | |
| 1537 public: | |
| 1538 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } | |
| 1539 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } | |
| 1540 | |
| 1541 // clearing/querying jni attach status | |
| 1542 bool is_attaching() const { return _is_attaching; } | |
| 1543 void set_attached() { _is_attaching = false; OrderAccess::fence(); } | |
| 342 | 1544 private: |
| 1545 // This field is used to determine if a thread has claimed | |
| 1546 // a par_id: it is -1 if the thread has not claimed a par_id; | |
| 1547 // otherwise its value is the par_id that has been claimed. | |
| 1548 int _claimed_par_id; | |
| 1549 public: | |
| 1550 int get_claimed_par_id() { return _claimed_par_id; } | |
| 1551 void set_claimed_par_id(int id) { _claimed_par_id = id;} | |
| 0 | 1552 }; |
| 1553 | |
| 1554 // Inline implementation of JavaThread::current | |
| 1555 inline JavaThread* JavaThread::current() { | |
| 1556 Thread* thread = ThreadLocalStorage::thread(); | |
| 1557 assert(thread != NULL && thread->is_Java_thread(), "just checking"); | |
| 1558 return (JavaThread*)thread; | |
| 1559 } | |
| 1560 | |
| 1561 inline CompilerThread* JavaThread::as_CompilerThread() { | |
| 1562 assert(is_Compiler_thread(), "just checking"); | |
| 1563 return (CompilerThread*)this; | |
| 1564 } | |
| 1565 | |
| 1566 inline bool JavaThread::stack_yellow_zone_disabled() { | |
| 1567 return _stack_guard_state == stack_guard_yellow_disabled; | |
| 1568 } | |
| 1569 | |
| 1570 inline bool JavaThread::stack_yellow_zone_enabled() { | |
| 1571 #ifdef ASSERT | |
| 1572 if (os::uses_stack_guard_pages()) { | |
| 1573 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); | |
| 1574 } | |
| 1575 #endif | |
| 1576 return _stack_guard_state == stack_guard_enabled; | |
| 1577 } | |
| 1578 | |
| 1579 inline size_t JavaThread::stack_available(address cur_sp) { | |
| 1580 // This code assumes java stacks grow down | |
| 1581 address low_addr; // Limit on the address for deepest stack depth | |
| 1582 if ( _stack_guard_state == stack_guard_unused) { | |
| 1583 low_addr = stack_base() - stack_size(); | |
| 1584 } else { | |
| 1585 low_addr = stack_yellow_zone_base(); | |
| 1586 } | |
| 1587 return cur_sp > low_addr ? cur_sp - low_addr : 0; | |
| 1588 } | |
| 1589 | |
| 1590 // A JavaThread for low memory detection support | |
| 1591 class LowMemoryDetectorThread : public JavaThread { | |
| 1592 friend class VMStructs; | |
| 1593 public: | |
| 1594 LowMemoryDetectorThread(ThreadFunction entry_point) : JavaThread(entry_point) {}; | |
| 1595 | |
| 1596 // Hide this thread from external view. | |
| 1597 bool is_hidden_from_external_view() const { return true; } | |
| 1598 }; | |
| 1599 | |
| 1600 // A thread used for Compilation. | |
| 1601 class CompilerThread : public JavaThread { | |
| 1602 friend class VMStructs; | |
| 1603 private: | |
| 1604 CompilerCounters* _counters; | |
| 1605 | |
| 1606 ciEnv* _env; | |
| 1607 CompileLog* _log; | |
| 1608 CompileTask* _task; | |
| 1609 CompileQueue* _queue; | |
| 1584 | 1610 BufferBlob* _buffer_blob; |
| 0 | 1611 |
| 1612 public: | |
| 1613 | |
| 1614 static CompilerThread* current(); | |
| 1615 | |
| 1616 CompilerThread(CompileQueue* queue, CompilerCounters* counters); | |
| 1617 | |
| 1618 bool is_Compiler_thread() const { return true; } | |
| 1619 // Hide this compiler thread from external view. | |
| 1620 bool is_hidden_from_external_view() const { return true; } | |
| 1621 | |
| 1622 CompileQueue* queue() { return _queue; } | |
| 1623 CompilerCounters* counters() { return _counters; } | |
| 1624 | |
| 1625 // Get/set the thread's compilation environment. | |
| 1626 ciEnv* env() { return _env; } | |
| 1627 void set_env(ciEnv* env) { _env = env; } | |
| 1628 | |
| 1584 | 1629 BufferBlob* get_buffer_blob() { return _buffer_blob; } |
| 1630 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }; | |
| 1631 | |
| 0 | 1632 // Get/set the thread's logging information |
| 1633 CompileLog* log() { return _log; } | |
| 1634 void init_log(CompileLog* log) { | |
| 1635 // Set once, for good. | |
| 1636 assert(_log == NULL, "set only once"); | |
| 1637 _log = log; | |
| 1638 } | |
| 1639 | |
| 1640 #ifndef PRODUCT | |
| 1641 private: | |
| 1642 IdealGraphPrinter *_ideal_graph_printer; | |
| 1643 public: | |
| 1644 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } | |
| 1645 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } | |
| 1646 #endif | |
| 1647 | |
| 1648 // Get/set the thread's current task | |
| 1649 CompileTask* task() { return _task; } | |
| 1650 void set_task(CompileTask* task) { _task = task; } | |
| 1651 }; | |
| 1652 | |
| 1653 inline CompilerThread* CompilerThread::current() { | |
| 1654 return JavaThread::current()->as_CompilerThread(); | |
| 1655 } | |
| 1656 | |
| 1657 | |
| 1658 // The active thread queue. It also keeps track of the current used | |
| 1659 // thread priorities. | |
| 1660 class Threads: AllStatic { | |
| 1661 friend class VMStructs; | |
| 1662 private: | |
| 1663 static JavaThread* _thread_list; | |
| 1664 static int _number_of_threads; | |
| 1665 static int _number_of_non_daemon_threads; | |
| 1666 static int _return_code; | |
| 1667 | |
| 1668 public: | |
| 1669 // Thread management | |
| 1670 // force_daemon is a concession to JNI, where we may need to add a | |
| 1671 // thread to the thread list before allocating its thread object | |
| 1672 static void add(JavaThread* p, bool force_daemon = false); | |
| 1673 static void remove(JavaThread* p); | |
| 1674 static bool includes(JavaThread* p); | |
| 1675 static JavaThread* first() { return _thread_list; } | |
| 1676 static void threads_do(ThreadClosure* tc); | |
| 1677 | |
| 1678 // Initializes the vm and creates the vm thread | |
| 1679 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); | |
| 1680 static void convert_vm_init_libraries_to_agents(); | |
| 1681 static void create_vm_init_libraries(); | |
| 1682 static void create_vm_init_agents(); | |
| 1683 static void shutdown_vm_agents(); | |
| 1684 static bool destroy_vm(); | |
| 1685 // Supported VM versions via JNI | |
| 1686 // Includes JNI_VERSION_1_1 | |
| 1687 static jboolean is_supported_jni_version_including_1_1(jint version); | |
| 1688 // Does not include JNI_VERSION_1_1 | |
| 1689 static jboolean is_supported_jni_version(jint version); | |
| 1690 | |
| 1691 // Garbage collection | |
| 1692 static void follow_other_roots(void f(oop*)); | |
| 1693 | |
| 1694 // Apply "f->do_oop" to all root oops in all threads. | |
| 1695 // This version may only be called by sequential code. | |
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1696 static void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1697 // This version may be called by sequential or parallel code. |
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1698 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1699 // This creates a list of GCTasks, one per thread. |
| 1700 static void create_thread_roots_tasks(GCTaskQueue* q); | |
| 1701 // This creates a list of GCTasks, one per thread, for marking objects. | |
| 1702 static void create_thread_roots_marking_tasks(GCTaskQueue* q); | |
| 1703 | |
| 1704 // Apply "f->do_oop" to roots in all threads that | |
| 1705 // are part of compiled frames | |
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1706 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1707 |
| 1708 static void convert_hcode_pointers(); | |
| 1709 static void restore_hcode_pointers(); | |
| 1710 | |
| 1711 // Sweeper | |
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1712 static void nmethods_do(CodeBlobClosure* cf); |
| 0 | 1713 |
| 1714 static void gc_epilogue(); | |
| 1715 static void gc_prologue(); | |
| 1716 | |
| 1717 // Verification | |
| 1718 static void verify(); | |
| 1719 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); | |
| 1720 static void print(bool print_stacks, bool internal_format) { | |
| 1721 // this function is only used by debug.cpp | |
| 1722 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); | |
| 1723 } | |
| 1724 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); | |
| 1725 | |
| 1726 // Get Java threads that are waiting to enter a monitor. If doLock | |
| 1727 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1728 // VM needs to be at a safepoint. | |
| 1729 static GrowableArray<JavaThread*>* get_pending_threads(int count, | |
| 1730 address monitor, bool doLock); | |
| 1731 | |
| 1732 // Get owning Java thread from the monitor's owner field. If doLock | |
| 1733 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1734 // VM needs to be at a safepoint. | |
| 1735 static JavaThread *owning_thread_from_monitor_owner(address owner, | |
| 1736 bool doLock); | |
| 1737 | |
| 1738 // Number of threads on the active threads list | |
| 1739 static int number_of_threads() { return _number_of_threads; } | |
| 1740 // Number of non-daemon threads on the active threads list | |
| 1741 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } | |
| 1742 | |
| 1743 // Deoptimizes all frames tied to marked nmethods | |
| 1744 static void deoptimized_wrt_marked_nmethods(); | |
| 1745 | |
| 1746 }; | |
| 1747 | |
| 1748 | |
| 1749 // Thread iterator | |
| 1750 class ThreadClosure: public StackObj { | |
| 1751 public: | |
| 1752 virtual void do_thread(Thread* thread) = 0; | |
| 1753 }; | |
| 1754 | |
| 1755 class SignalHandlerMark: public StackObj { | |
| 1756 private: | |
| 1757 Thread* _thread; | |
| 1758 public: | |
| 1759 SignalHandlerMark(Thread* t) { | |
| 1760 _thread = t; | |
| 1761 if (_thread) _thread->enter_signal_handler(); | |
| 1762 } | |
| 1763 ~SignalHandlerMark() { | |
| 1764 if (_thread) _thread->leave_signal_handler(); | |
| 1765 _thread = NULL; | |
| 1766 } | |
| 1767 }; | |
| 1768 | |
| 1769 // ParkEvents are type-stable and immortal. | |
| 1770 // | |
| 1771 // Lifecycle: Once a ParkEvent is associated with a thread that ParkEvent remains | |
| 1772 // associated with the thread for the thread's entire lifetime - the relationship is | |
| 1773 // stable. A thread will be associated at most one ParkEvent. When the thread | |
| 1774 // expires, the ParkEvent moves to the EventFreeList. New threads attempt to allocate from | |
| 1775 // the EventFreeList before creating a new Event. Type-stability frees us from | |
| 1776 // worrying about stale Event or Thread references in the objectMonitor subsystem. | |
| 1777 // (A reference to ParkEvent is always valid, even though the event may no longer be associated | |
| 1778 // with the desired or expected thread. A key aspect of this design is that the callers of | |
| 1779 // park, unpark, etc must tolerate stale references and spurious wakeups). | |
| 1780 // | |
| 1781 // Only the "associated" thread can block (park) on the ParkEvent, although | |
| 1782 // any other thread can unpark a reachable parkevent. Park() is allowed to | |
| 1783 // return spuriously. In fact park-unpark a really just an optimization to | |
| 1784 // avoid unbounded spinning and surrender the CPU to be a polite system citizen. | |
| 1785 // A degenerate albeit "impolite" park-unpark implementation could simply return. | |
| 1786 // See http://blogs.sun.com/dave for more details. | |
| 1787 // | |
| 1788 // Eventually I'd like to eliminate Events and ObjectWaiters, both of which serve as | |
| 1789 // thread proxies, and simply make the THREAD structure type-stable and persistent. | |
| 1790 // Currently, we unpark events associated with threads, but ideally we'd just | |
| 1791 // unpark threads. | |
| 1792 // | |
| 1793 // The base-class, PlatformEvent, is platform-specific while the ParkEvent is | |
| 1794 // platform-independent. PlatformEvent provides park(), unpark(), etc., and | |
| 1795 // is abstract -- that is, a PlatformEvent should never be instantiated except | |
| 1796 // as part of a ParkEvent. | |
| 1797 // Equivalently we could have defined a platform-independent base-class that | |
| 1798 // exported Allocate(), Release(), etc. The platform-specific class would extend | |
| 1799 // that base-class, adding park(), unpark(), etc. | |
| 1800 // | |
| 1801 // A word of caution: The JVM uses 2 very similar constructs: | |
| 1802 // 1. ParkEvent are used for Java-level "monitor" synchronization. | |
| 1803 // 2. Parkers are used by JSR166-JUC park-unpark. | |
| 1804 // | |
| 1805 // We'll want to eventually merge these redundant facilities and use ParkEvent. | |
| 1806 | |
| 1807 | |
| 1808 class ParkEvent : public os::PlatformEvent { | |
| 1809 private: | |
| 1810 ParkEvent * FreeNext ; | |
| 1811 | |
| 1812 // Current association | |
| 1813 Thread * AssociatedWith ; | |
| 1814 intptr_t RawThreadIdentity ; // LWPID etc | |
| 1815 volatile int Incarnation ; | |
| 1816 | |
| 1817 // diagnostic : keep track of last thread to wake this thread. | |
| 1818 // this is useful for construction of dependency graphs. | |
| 1819 void * LastWaker ; | |
| 1820 | |
| 1821 public: | |
| 1822 // MCS-CLH list linkage and Native Mutex/Monitor | |
| 1823 ParkEvent * volatile ListNext ; | |
| 1824 ParkEvent * volatile ListPrev ; | |
| 1825 volatile intptr_t OnList ; | |
| 1826 volatile int TState ; | |
| 1827 volatile int Notified ; // for native monitor construct | |
| 1828 volatile int IsWaiting ; // Enqueued on WaitSet | |
| 1829 | |
| 1830 | |
| 1831 private: | |
| 1832 static ParkEvent * volatile FreeList ; | |
| 1833 static volatile int ListLock ; | |
| 1834 | |
| 1835 // It's prudent to mark the dtor as "private" | |
| 1836 // ensuring that it's not visible outside the package. | |
| 1837 // Unfortunately gcc warns about such usage, so | |
| 1838 // we revert to the less desirable "protected" visibility. | |
| 1839 // The other compilers accept private dtors. | |
| 1840 | |
| 1841 protected: // Ensure dtor is never invoked | |
| 1842 ~ParkEvent() { guarantee (0, "invariant") ; } | |
| 1843 | |
| 1844 ParkEvent() : PlatformEvent() { | |
| 1845 AssociatedWith = NULL ; | |
| 1846 FreeNext = NULL ; | |
| 1847 ListNext = NULL ; | |
| 1848 ListPrev = NULL ; | |
| 1849 OnList = 0 ; | |
| 1850 TState = 0 ; | |
| 1851 Notified = 0 ; | |
| 1852 IsWaiting = 0 ; | |
| 1853 } | |
| 1854 | |
| 1855 // We use placement-new to force ParkEvent instances to be | |
| 1856 // aligned on 256-byte address boundaries. This ensures that the least | |
| 1857 // significant byte of a ParkEvent address is always 0. | |
| 1858 | |
| 1859 void * operator new (size_t sz) ; | |
| 1860 void operator delete (void * a) ; | |
| 1861 | |
| 1862 public: | |
| 1863 static ParkEvent * Allocate (Thread * t) ; | |
| 1864 static void Release (ParkEvent * e) ; | |
| 1865 } ; |