1 /* 2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2021, Azul Systems, Inc. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #ifndef SHARE_RUNTIME_JAVATHREAD_HPP 27 #define SHARE_RUNTIME_JAVATHREAD_HPP 28 29 #include "jni.h" 30 #include "memory/allocation.hpp" 31 #include "oops/oop.hpp" 32 #include "oops/oopHandle.hpp" 33 #include "runtime/frame.hpp" 34 #include "runtime/globals.hpp" 35 #include "runtime/handshake.hpp" 36 #include "runtime/javaFrameAnchor.hpp" 37 #include "runtime/park.hpp" 38 #include "runtime/safepointMechanism.hpp" 39 #include "runtime/stackWatermarkSet.hpp" 40 #include "runtime/stackOverflow.hpp" 41 #include "runtime/thread.hpp" 42 #include "runtime/threadHeapSampler.hpp" 43 #include "runtime/threadStatisticalInfo.hpp" 44 #include "utilities/exceptions.hpp" 45 #include "utilities/globalDefinitions.hpp" 46 #include "utilities/macros.hpp" 47 #if INCLUDE_JFR 48 #include "jfr/support/jfrThreadExtension.hpp" 49 #endif 50 51 class AsyncExceptionHandshake; 52 class ContinuationEntry; 53 class DeoptResourceMark; 54 class JNIHandleBlock; 55 class JVMCIRuntime; 56 57 class JvmtiDeferredUpdates; 58 class JvmtiSampledObjectAllocEventCollector; 59 class JvmtiThreadState; 60 61 class Metadata; 62 class OopHandleList; 63 class OopStorage; 64 class OSThread; 65 66 class ThreadsList; 67 class ThreadSafepointState; 68 class ThreadStatistics; 69 70 class vframeArray; 71 class vframe; 72 class javaVFrame; 73 74 class JavaThread; 75 typedef void (*ThreadFunction)(JavaThread*, TRAPS); 76 77 class JavaThread: public Thread { 78 friend class VMStructs; 79 friend class JVMCIVMStructs; 80 friend class WhiteBox; 81 friend class ThreadsSMRSupport; // to access _threadObj for exiting_threads_oops_do 82 friend class HandshakeState; 83 friend class Continuation; 84 friend class Threads; 85 friend class ServiceThread; // for deferred OopHandle release access 86 private: 87 bool _on_thread_list; // Is set when this JavaThread is added to the Threads list 88 89 // All references to Java objects managed via OopHandles. These 90 // have to be released by the ServiceThread after the JavaThread has 91 // terminated - see add_oop_handles_for_release(). 92 OopHandle _threadObj; // The Java level thread object 93 OopHandle _vthread; // the value returned by Thread.currentThread(): the virtual thread, if mounted, otherwise _threadObj 94 OopHandle _jvmti_vthread; 95 OopHandle _scopedValueCache; 96 97 static OopStorage* _thread_oop_storage; 98 99 #ifdef ASSERT 100 private: 101 int _java_call_counter; 102 103 public: 104 int java_call_counter() { return _java_call_counter; } 105 void inc_java_call_counter() { _java_call_counter++; } 106 void dec_java_call_counter() { 107 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 108 _java_call_counter--; 109 } 110 private: // restore original namespace restriction 111 #endif // ifdef ASSERT 112 113 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 114 115 ThreadFunction _entry_point; 116 117 JNIEnv _jni_environment; 118 119 // Deopt support 120 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 121 122 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized 123 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 124 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 125 // Holds updates by JVMTI agents for compiled frames that cannot be performed immediately. They 126 // will be carried out as soon as possible which, in most cases, is just before deoptimization of 127 // the frame, when control returns to it. 128 JvmtiDeferredUpdates* _jvmti_deferred_updates; 129 130 // Handshake value for fixing 6243940. We need a place for the i2c 131 // adapter to store the callee Method*. This value is NEVER live 132 // across a gc point so it does NOT have to be gc'd 133 // The handshake is open ended since we can't be certain that it will 134 // be NULLed. This is because we rarely ever see the race and end up 135 // in handle_wrong_method which is the backend of the handshake. See 136 // code in i2c adapters and handle_wrong_method. 137 138 Method* _callee_target; 139 140 // Used to pass back results to the interpreter or generated code running Java code. 141 oop _vm_result; // oop result is GC-preserved 142 Metadata* _vm_result_2; // non-oop result 143 oop _return_buffered_value; // buffered value being returned 144 145 // See ReduceInitialCardMarks: this holds the precise space interval of 146 // the most recent slow path allocation for which compiled code has 147 // elided card-marks for performance along the fast-path. 148 MemRegion _deferred_card_mark; 149 150 ObjectMonitor* volatile _current_pending_monitor; // ObjectMonitor this thread is waiting to lock 151 bool _current_pending_monitor_is_from_java; // locking is from Java code 152 ObjectMonitor* volatile _current_waiting_monitor; // ObjectMonitor on which this thread called Object.wait() 153 154 // Active_handles points to a block of handles 155 JNIHandleBlock* _active_handles; 156 157 // One-element thread local free list 158 JNIHandleBlock* _free_handle_block; 159 160 public: 161 volatile intptr_t _Stalled; 162 163 // For tracking the heavyweight monitor the thread is pending on. 164 ObjectMonitor* current_pending_monitor() { 165 // Use Atomic::load() to prevent data race between concurrent modification and 166 // concurrent readers, e.g. ThreadService::get_current_contended_monitor(). 167 // Especially, reloading pointer from thread after NULL check must be prevented. 168 return Atomic::load(&_current_pending_monitor); 169 } 170 void set_current_pending_monitor(ObjectMonitor* monitor) { 171 Atomic::store(&_current_pending_monitor, monitor); 172 } 173 void set_current_pending_monitor_is_from_java(bool from_java) { 174 _current_pending_monitor_is_from_java = from_java; 175 } 176 bool current_pending_monitor_is_from_java() { 177 return _current_pending_monitor_is_from_java; 178 } 179 ObjectMonitor* current_waiting_monitor() { 180 // See the comment in current_pending_monitor() above. 181 return Atomic::load(&_current_waiting_monitor); 182 } 183 void set_current_waiting_monitor(ObjectMonitor* monitor) { 184 Atomic::store(&_current_waiting_monitor, monitor); 185 } 186 187 // JNI handle support 188 JNIHandleBlock* active_handles() const { return _active_handles; } 189 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 190 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 191 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 192 193 void push_jni_handle_block(); 194 void pop_jni_handle_block(); 195 196 private: 197 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 198 // allocated during deoptimization 199 // and by JNI_MonitorEnter/Exit 200 201 enum SuspendFlags { 202 // NOTE: avoid using the sign-bit as cc generates different test code 203 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 204 _trace_flag = 0x00000004U, // call tracing backend 205 _obj_deopt = 0x00000008U // suspend for object reallocation and relocking for JVMTI agent 206 }; 207 208 // various suspension related flags - atomically updated 209 volatile uint32_t _suspend_flags; 210 211 inline void set_suspend_flag(SuspendFlags f); 212 inline void clear_suspend_flag(SuspendFlags f); 213 214 public: 215 inline void set_trace_flag(); 216 inline void clear_trace_flag(); 217 inline void set_obj_deopt_flag(); 218 inline void clear_obj_deopt_flag(); 219 bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; } 220 bool is_obj_deopt_suspend() { return (_suspend_flags & _obj_deopt) != 0; } 221 222 // Asynchronous exception support 223 private: 224 friend class InstallAsyncExceptionHandshake; 225 friend class AsyncExceptionHandshake; 226 friend class HandshakeState; 227 228 void install_async_exception(AsyncExceptionHandshake* aec = NULL); 229 void handle_async_exception(oop java_throwable); 230 public: 231 bool has_async_exception_condition(); 232 inline void set_pending_unsafe_access_error(); 233 static void send_async_exception(JavaThread* jt, oop java_throwable); 234 235 class NoAsyncExceptionDeliveryMark : public StackObj { 236 friend JavaThread; 237 JavaThread *_target; 238 inline NoAsyncExceptionDeliveryMark(JavaThread *t); 239 inline ~NoAsyncExceptionDeliveryMark(); 240 }; 241 242 // Safepoint support 243 public: // Expose _thread_state for SafeFetchInt() 244 volatile JavaThreadState _thread_state; 245 private: 246 SafepointMechanism::ThreadData _poll_data; 247 ThreadSafepointState* _safepoint_state; // Holds information about a thread during a safepoint 248 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 249 NOT_PRODUCT(bool _requires_cross_modify_fence;) // State used by VerifyCrossModifyFence 250 #ifdef ASSERT 251 // Debug support for checking if code allows safepoints or not. 252 // Safepoints in the VM can happen because of allocation, invoking a VM operation, or blocking on 253 // mutex, or blocking on an object synchronizer (Java locking). 254 // If _no_safepoint_count is non-zero, then an assertion failure will happen in any of 255 // the above cases. The class NoSafepointVerifier is used to set this counter. 256 int _no_safepoint_count; // If 0, thread allow a safepoint to happen 257 258 public: 259 void inc_no_safepoint_count() { _no_safepoint_count++; } 260 void dec_no_safepoint_count() { _no_safepoint_count--; } 261 #endif // ASSERT 262 public: 263 // These functions check conditions before possibly going to a safepoint. 264 // including NoSafepointVerifier. 265 void check_for_valid_safepoint_state() NOT_DEBUG_RETURN; 266 void check_possible_safepoint() NOT_DEBUG_RETURN; 267 268 #ifdef ASSERT 269 private: 270 volatile uint64_t _visited_for_critical_count; 271 272 public: 273 void set_visited_for_critical_count(uint64_t safepoint_id) { 274 assert(_visited_for_critical_count == 0, "Must be reset before set"); 275 assert((safepoint_id & 0x1) == 1, "Must be odd"); 276 _visited_for_critical_count = safepoint_id; 277 } 278 void reset_visited_for_critical_count(uint64_t safepoint_id) { 279 assert(_visited_for_critical_count == safepoint_id, "Was not visited"); 280 _visited_for_critical_count = 0; 281 } 282 bool was_visited_for_critical_count(uint64_t safepoint_id) const { 283 return _visited_for_critical_count == safepoint_id; 284 } 285 #endif // ASSERT 286 287 // JavaThread termination support 288 public: 289 enum TerminatedTypes { 290 _not_terminated = 0xDEAD - 3, 291 _thread_exiting, // JavaThread::exit() has been called for this thread 292 _thread_gc_barrier_detached, // thread's GC barrier has been detached 293 _thread_terminated, // JavaThread is removed from thread list 294 _vm_exited // JavaThread is still executing native code, but VM is terminated 295 // only VM_Exit can set _vm_exited 296 }; 297 298 private: 299 // In general a JavaThread's _terminated field transitions as follows: 300 // 301 // _not_terminated => _thread_exiting => _thread_gc_barrier_detached => _thread_terminated 302 // 303 // _vm_exited is a special value to cover the case of a JavaThread 304 // executing native code after the VM itself is terminated. 305 // 306 // A JavaThread that fails to JNI attach has these _terminated field transitions: 307 // _not_terminated => _thread_terminated 308 // 309 volatile TerminatedTypes _terminated; 310 311 jint _in_deopt_handler; // count of deoptimization 312 // handlers thread is in 313 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 314 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 315 // never locked) when throwing an exception. Used by interpreter only. 316 #if INCLUDE_JVMTI 317 volatile bool _carrier_thread_suspended; // Carrier thread is externally suspended 318 bool _is_in_VTMS_transition; // thread is in virtual thread mount state transition 319 bool _is_in_tmp_VTMS_transition; // thread is in temporary virtual thread mount state transition 320 #ifdef ASSERT 321 bool _is_VTMS_transition_disabler; // thread currently disabled VTMS transitions 322 #endif 323 #endif 324 325 // JNI attach states: 326 enum JNIAttachStates { 327 _not_attaching_via_jni = 1, // thread is not attaching via JNI 328 _attaching_via_jni, // thread is attaching via JNI 329 _attached_via_jni // thread has attached via JNI 330 }; 331 332 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 333 // A native thread that is attaching via JNI starts with a value 334 // of _attaching_via_jni and transitions to _attached_via_jni. 335 volatile JNIAttachStates _jni_attach_state; 336 337 338 #if INCLUDE_JVMCI 339 // The _pending_* fields below are used to communicate extra information 340 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. 341 342 // Communicates the DeoptReason and DeoptAction of the uncommon trap 343 int _pending_deoptimization; 344 345 // Specifies whether the uncommon trap is to bci 0 of a synchronized method 346 // before the monitor has been acquired. 347 bool _pending_monitorenter; 348 349 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter 350 bool _pending_transfer_to_interpreter; 351 352 // True if in a runtime call from compiled code that will deoptimize 353 // and re-execute a failed heap allocation in the interpreter. 354 bool _in_retryable_allocation; 355 356 // An id of a speculation that JVMCI compiled code can use to further describe and 357 // uniquely identify the speculative optimization guarded by an uncommon trap. 358 // See JVMCINMethodData::SPECULATION_LENGTH_BITS for further details. 359 jlong _pending_failed_speculation; 360 361 // These fields are mutually exclusive in terms of live ranges. 362 union { 363 // Communicates the pc at which the most recent implicit exception occurred 364 // from the signal handler to a deoptimization stub. 365 address _implicit_exception_pc; 366 367 // Communicates an alternative call target to an i2c stub from a JavaCall . 368 address _alternate_call_target; 369 } _jvmci; 370 371 // The JVMCIRuntime in a JVMCI shared library 372 JVMCIRuntime* _libjvmci_runtime; 373 374 // Support for high precision, thread sensitive counters in JVMCI compiled code. 375 jlong* _jvmci_counters; 376 377 // Fast thread locals for use by JVMCI 378 jlong _jvmci_reserved0; 379 jlong _jvmci_reserved1; 380 oop _jvmci_reserved_oop0; 381 382 public: 383 static jlong* _jvmci_old_thread_counters; 384 static void collect_counters(jlong* array, int length); 385 386 bool resize_counters(int current_size, int new_size); 387 388 static bool resize_all_jvmci_counters(int new_size); 389 390 void set_jvmci_reserved_oop0(oop value) { 391 _jvmci_reserved_oop0 = value; 392 } 393 394 oop get_jvmci_reserved_oop0() { 395 return _jvmci_reserved_oop0; 396 } 397 398 void set_jvmci_reserved0(jlong value) { 399 _jvmci_reserved0 = value; 400 } 401 402 jlong get_jvmci_reserved0() { 403 return _jvmci_reserved0; 404 } 405 406 void set_jvmci_reserved1(jlong value) { 407 _jvmci_reserved1 = value; 408 } 409 410 jlong get_jvmci_reserved1() { 411 return _jvmci_reserved1; 412 } 413 414 private: 415 #endif // INCLUDE_JVMCI 416 417 StackOverflow _stack_overflow_state; 418 419 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 420 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 421 // code) 422 volatile oop _exception_oop; // Exception thrown in compiled code 423 volatile address _exception_pc; // PC where exception happened 424 volatile address _exception_handler_pc; // PC for handler of exception 425 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 426 427 private: 428 // support for JNI critical regions 429 jint _jni_active_critical; // count of entries into JNI critical region 430 431 // Checked JNI: function name requires exception check 432 char* _pending_jni_exception_check_fn; 433 434 // For deadlock detection. 435 int _depth_first_number; 436 437 // JVMTI PopFrame support 438 // This is set to popframe_pending to signal that top Java frame should be popped immediately 439 int _popframe_condition; 440 441 // If reallocation of scalar replaced objects fails, we throw OOM 442 // and during exception propagation, pop the top 443 // _frames_to_pop_failed_realloc frames, the ones that reference 444 // failed reallocations. 445 int _frames_to_pop_failed_realloc; 446 447 ContinuationEntry* _cont_entry; 448 intptr_t* _cont_fastpath; // the sp of the oldest known interpreted/call_stub frame inside the 449 // continuation that we know about 450 int _cont_fastpath_thread_state; // whether global thread state allows continuation fastpath (JVMTI) 451 // It's signed for error detection. 452 #ifdef _LP64 453 int64_t _held_monitor_count; // used by continuations for fast lock detection 454 int64_t _jni_monitor_count; 455 #else 456 int32_t _held_monitor_count; // used by continuations for fast lock detection 457 int32_t _jni_monitor_count; 458 #endif 459 460 private: 461 462 friend class VMThread; 463 friend class ThreadWaitTransition; 464 friend class VM_Exit; 465 466 // Stack watermark barriers. 467 StackWatermarks _stack_watermarks; 468 469 public: 470 inline StackWatermarks* stack_watermarks() { return &_stack_watermarks; } 471 472 public: 473 // Constructor 474 JavaThread(); // delegating constructor 475 JavaThread(bool is_attaching_via_jni); // for main thread and JNI attached threads 476 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 477 ~JavaThread(); 478 479 #ifdef ASSERT 480 // verify this JavaThread hasn't be published in the Threads::list yet 481 void verify_not_published(); 482 #endif // ASSERT 483 484 StackOverflow* stack_overflow_state() { return &_stack_overflow_state; } 485 486 //JNI functiontable getter/setter for JVMTI jni function table interception API. 487 void set_jni_functions(struct JNINativeInterface_* functionTable) { 488 _jni_environment.functions = functionTable; 489 } 490 struct JNINativeInterface_* get_jni_functions() { 491 return (struct JNINativeInterface_ *)_jni_environment.functions; 492 } 493 494 // This function is called at thread creation to allow 495 // platform specific thread variables to be initialized. 496 void cache_global_variables(); 497 498 // Executes Shutdown.shutdown() 499 void invoke_shutdown_hooks(); 500 501 // Cleanup on thread exit 502 enum ExitType { 503 normal_exit, 504 jni_detach 505 }; 506 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 507 508 void cleanup_failed_attach_current_thread(bool is_daemon); 509 510 // Testers 511 virtual bool is_Java_thread() const { return true; } 512 virtual bool can_call_java() const { return true; } 513 514 virtual bool is_active_Java_thread() const { 515 return on_thread_list() && !is_terminated(); 516 } 517 518 // Thread oop. threadObj() can be NULL for initial JavaThread 519 // (or for threads attached via JNI) 520 oop threadObj() const; 521 void set_threadOopHandles(oop p); 522 oop vthread() const; 523 void set_vthread(oop p); 524 oop scopedValueCache() const; 525 void set_scopedValueCache(oop p); 526 void clear_scopedValueBindings(); 527 oop jvmti_vthread() const; 528 void set_jvmti_vthread(oop p); 529 530 // Prepare thread and add to priority queue. If a priority is 531 // not specified, use the priority of the thread object. Threads_lock 532 // must be held while this function is called. 533 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 534 535 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 536 address saved_exception_pc() { return _saved_exception_pc; } 537 538 ThreadFunction entry_point() const { return _entry_point; } 539 540 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 541 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS); 542 543 // Last frame anchor routines 544 545 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 546 547 // last_Java_sp 548 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 549 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 550 551 // last_Java_pc 552 553 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 554 555 // Safepoint support 556 inline JavaThreadState thread_state() const; 557 inline void set_thread_state(JavaThreadState s); 558 inline void set_thread_state_fence(JavaThreadState s); // fence after setting thread state 559 inline ThreadSafepointState* safepoint_state() const; 560 inline void set_safepoint_state(ThreadSafepointState* state); 561 inline bool is_at_poll_safepoint(); 562 563 // JavaThread termination and lifecycle support: 564 void smr_delete(); 565 bool on_thread_list() const { return _on_thread_list; } 566 void set_on_thread_list() { _on_thread_list = true; } 567 568 // thread has called JavaThread::exit(), thread's GC barrier is detached 569 // or thread is terminated 570 bool is_exiting() const; 571 // thread's GC barrier is NOT detached and thread is NOT terminated 572 bool is_oop_safe() const; 573 // thread is terminated (no longer on the threads list); the thread must 574 // be protected by a ThreadsListHandle to avoid potential crashes. 575 bool check_is_terminated(TerminatedTypes l_terminated) const { 576 return l_terminated == _thread_terminated || l_terminated == _vm_exited; 577 } 578 bool is_terminated() const; 579 void set_terminated(TerminatedTypes t); 580 581 void block_if_vm_exited(); 582 583 bool doing_unsafe_access() { return _doing_unsafe_access; } 584 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 585 586 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 587 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 588 589 SafepointMechanism::ThreadData* poll_data() { return &_poll_data; } 590 591 void set_requires_cross_modify_fence(bool val) PRODUCT_RETURN NOT_PRODUCT({ _requires_cross_modify_fence = val; }) 592 593 // Continuation support 594 ContinuationEntry* last_continuation() const { return _cont_entry; } 595 void set_cont_fastpath(intptr_t* x) { _cont_fastpath = x; } 596 void push_cont_fastpath(intptr_t* sp) { if (sp > _cont_fastpath) _cont_fastpath = sp; } 597 void set_cont_fastpath_thread_state(bool x) { _cont_fastpath_thread_state = (int)x; } 598 intptr_t* raw_cont_fastpath() const { return _cont_fastpath; } 599 bool cont_fastpath() const { return _cont_fastpath == NULL && _cont_fastpath_thread_state != 0; } 600 bool cont_fastpath_thread_state() const { return _cont_fastpath_thread_state != 0; } 601 602 void inc_held_monitor_count(int i = 1, bool jni = false); 603 void dec_held_monitor_count(int i = 1, bool jni = false); 604 605 int64_t held_monitor_count() { return (int64_t)_held_monitor_count; } 606 int64_t jni_monitor_count() { return (int64_t)_jni_monitor_count; } 607 void clear_jni_monitor_count() { _jni_monitor_count = 0; } 608 609 inline bool is_vthread_mounted() const; 610 inline const ContinuationEntry* vthread_continuation() const; 611 612 private: 613 DEBUG_ONLY(void verify_frame_info();) 614 615 // Support for thread handshake operations 616 HandshakeState _handshake; 617 public: 618 HandshakeState* handshake_state() { return &_handshake; } 619 620 // A JavaThread can always safely operate on it self and other threads 621 // can do it safely if they are the active handshaker. 622 bool is_handshake_safe_for(Thread* th) const { 623 return _handshake.active_handshaker() == th || this == th; 624 } 625 626 // Suspend/resume support for JavaThread 627 // higher-level suspension/resume logic called by the public APIs 628 bool java_suspend(); 629 bool java_resume(); 630 bool is_suspended() { return _handshake.is_suspended(); } 631 632 // Check for async exception in addition to safepoint. 633 static void check_special_condition_for_native_trans(JavaThread *thread); 634 635 // Synchronize with another thread that is deoptimizing objects of the 636 // current thread, i.e. reverts optimizations based on escape analysis. 637 void wait_for_object_deoptimization(); 638 639 #if INCLUDE_JVMTI 640 inline void set_carrier_thread_suspended(); 641 inline void clear_carrier_thread_suspended(); 642 643 bool is_carrier_thread_suspended() const { 644 return _carrier_thread_suspended; 645 } 646 647 bool is_in_VTMS_transition() const { return _is_in_VTMS_transition; } 648 bool is_in_tmp_VTMS_transition() const { return _is_in_tmp_VTMS_transition; } 649 bool is_in_any_VTMS_transition() const { return _is_in_VTMS_transition || _is_in_tmp_VTMS_transition; } 650 651 void set_is_in_VTMS_transition(bool val); 652 void toggle_is_in_tmp_VTMS_transition() { _is_in_tmp_VTMS_transition = !_is_in_tmp_VTMS_transition; }; 653 654 #ifdef ASSERT 655 bool is_VTMS_transition_disabler() const { return _is_VTMS_transition_disabler; } 656 void set_is_VTMS_transition_disabler(bool val); 657 #endif 658 #endif 659 660 // Support for object deoptimization and JFR suspension 661 void handle_special_runtime_exit_condition(); 662 bool has_special_runtime_exit_condition() { 663 return (_suspend_flags & (_obj_deopt JFR_ONLY(| _trace_flag))) != 0; 664 } 665 666 // Fast-locking support 667 bool is_lock_owned(address adr) const; 668 669 // Accessors for vframe array top 670 // The linked list of vframe arrays are sorted on sp. This means when we 671 // unpack the head must contain the vframe array to unpack. 672 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 673 vframeArray* vframe_array_head() const { return _vframe_array_head; } 674 675 // Side structure for deferring update of java frame locals until deopt occurs 676 JvmtiDeferredUpdates* deferred_updates() const { return _jvmti_deferred_updates; } 677 void set_deferred_updates(JvmtiDeferredUpdates* du) { _jvmti_deferred_updates = du; } 678 679 // These only really exist to make debugging deopt problems simpler 680 681 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 682 vframeArray* vframe_array_last() const { return _vframe_array_last; } 683 684 // The special resourceMark used during deoptimization 685 686 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 687 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 688 689 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; } 690 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; } 691 692 Method* callee_target() const { return _callee_target; } 693 void set_callee_target (Method* x) { _callee_target = x; } 694 695 // Oop results of vm runtime calls 696 oop vm_result() const { return _vm_result; } 697 void set_vm_result (oop x) { _vm_result = x; } 698 699 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 700 701 oop return_buffered_value() const { return _return_buffered_value; } 702 void set_return_buffered_value(oop val) { _return_buffered_value = val; } 703 704 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 705 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 706 707 #if INCLUDE_JVMCI 708 jlong pending_failed_speculation() const { return _pending_failed_speculation; } 709 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } 710 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } 711 void set_pending_failed_speculation(jlong failed_speculation) { _pending_failed_speculation = failed_speculation; } 712 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } 713 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; } 714 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; } 715 716 virtual bool in_retryable_allocation() const { return _in_retryable_allocation; } 717 void set_in_retryable_allocation(bool b) { _in_retryable_allocation = b; } 718 719 JVMCIRuntime* libjvmci_runtime() const { return _libjvmci_runtime; } 720 void set_libjvmci_runtime(JVMCIRuntime* rt) { 721 assert((_libjvmci_runtime == nullptr && rt != nullptr) || (_libjvmci_runtime != nullptr && rt == nullptr), "must be"); 722 _libjvmci_runtime = rt; 723 } 724 #endif // INCLUDE_JVMCI 725 726 // Exception handling for compiled methods 727 oop exception_oop() const; 728 address exception_pc() const { return _exception_pc; } 729 730 void set_exception_oop(oop o); 731 void set_exception_pc(address a) { _exception_pc = a; } 732 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 733 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 734 735 void clear_exception_oop_and_pc() { 736 set_exception_oop(NULL); 737 set_exception_pc(NULL); 738 } 739 740 // Check if address is in the usable part of the stack (excludes protected 741 // guard pages). Can be applied to any thread and is an approximation for 742 // using is_in_live_stack when the query has to happen from another thread. 743 bool is_in_usable_stack(address adr) const { 744 return is_in_stack_range_incl(adr, _stack_overflow_state.stack_reserved_zone_base()); 745 } 746 747 // Misc. accessors/mutators 748 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 749 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 750 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 751 752 static ByteSize scopedValueCache_offset() { return byte_offset_of(JavaThread, _scopedValueCache); } 753 754 // For assembly stub generation 755 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } 756 static ByteSize vthread_offset() { return byte_offset_of(JavaThread, _vthread); } 757 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } 758 static ByteSize pending_jni_exception_check_fn_offset() { 759 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn); 760 } 761 static ByteSize last_Java_sp_offset() { 762 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 763 } 764 static ByteSize last_Java_pc_offset() { 765 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 766 } 767 static ByteSize frame_anchor_offset() { 768 return byte_offset_of(JavaThread, _anchor); 769 } 770 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } 771 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } 772 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } 773 static ByteSize return_buffered_value_offset() { return byte_offset_of(JavaThread, _return_buffered_value); } 774 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } 775 static ByteSize polling_word_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_word);} 776 static ByteSize polling_page_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_page);} 777 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } 778 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } 779 #if INCLUDE_JVMCI 780 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); } 781 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); } 782 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); } 783 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); } 784 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); } 785 #endif // INCLUDE_JVMCI 786 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } 787 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } 788 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 789 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 790 791 static ByteSize active_handles_offset() { return byte_offset_of(JavaThread, _active_handles); } 792 793 // StackOverflow offsets 794 static ByteSize stack_overflow_limit_offset() { 795 return byte_offset_of(JavaThread, _stack_overflow_state._stack_overflow_limit); 796 } 797 static ByteSize stack_guard_state_offset() { 798 return byte_offset_of(JavaThread, _stack_overflow_state._stack_guard_state); 799 } 800 static ByteSize reserved_stack_activation_offset() { 801 return byte_offset_of(JavaThread, _stack_overflow_state._reserved_stack_activation); 802 } 803 static ByteSize shadow_zone_safe_limit() { 804 return byte_offset_of(JavaThread, _stack_overflow_state._shadow_zone_safe_limit); 805 } 806 static ByteSize shadow_zone_growth_watermark() { 807 return byte_offset_of(JavaThread, _stack_overflow_state._shadow_zone_growth_watermark); 808 } 809 810 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } 811 812 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 813 static ByteSize should_post_on_exceptions_flag_offset() { 814 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 815 } 816 static ByteSize doing_unsafe_access_offset() { return byte_offset_of(JavaThread, _doing_unsafe_access); } 817 NOT_PRODUCT(static ByteSize requires_cross_modify_fence_offset() { return byte_offset_of(JavaThread, _requires_cross_modify_fence); }) 818 819 static ByteSize cont_entry_offset() { return byte_offset_of(JavaThread, _cont_entry); } 820 static ByteSize cont_fastpath_offset() { return byte_offset_of(JavaThread, _cont_fastpath); } 821 static ByteSize held_monitor_count_offset() { return byte_offset_of(JavaThread, _held_monitor_count); } 822 823 // Returns the jni environment for this thread 824 JNIEnv* jni_environment() { return &_jni_environment; } 825 826 // Returns the current thread as indicated by the given JNIEnv. 827 // We don't assert it is Thread::current here as that is done at the 828 // external JNI entry points where the JNIEnv is passed into the VM. 829 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 830 JavaThread* current = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 831 // We can't normally get here in a thread that has completed its 832 // execution and so "is_terminated", except when the call is from 833 // AsyncGetCallTrace, which can be triggered by a signal at any point in 834 // a thread's lifecycle. A thread is also considered terminated if the VM 835 // has exited, so we have to check this and block in case this is a daemon 836 // thread returning to the VM (the JNI DirectBuffer entry points rely on 837 // this). 838 if (current->is_terminated()) { 839 current->block_if_vm_exited(); 840 } 841 return current; 842 } 843 844 // JNI critical regions. These can nest. 845 bool in_critical() { return _jni_active_critical > 0; } 846 bool in_last_critical() { return _jni_active_critical == 1; } 847 inline void enter_critical(); 848 void exit_critical() { 849 assert(Thread::current() == this, "this must be current thread"); 850 _jni_active_critical--; 851 assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); 852 } 853 854 // Checked JNI: is the programmer required to check for exceptions, if so specify 855 // which function name. Returning to a Java frame should implicitly clear the 856 // pending check, this is done for Native->Java transitions (i.e. user JNI code). 857 // VM->Java transitions are not cleared, it is expected that JNI code enclosed 858 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal). 859 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 860 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 861 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 862 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 863 864 // For deadlock detection 865 int depth_first_number() { return _depth_first_number; } 866 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 867 868 private: 869 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 870 871 public: 872 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 873 void add_monitor_chunk(MonitorChunk* chunk); 874 void remove_monitor_chunk(MonitorChunk* chunk); 875 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 876 void inc_in_deopt_handler() { _in_deopt_handler++; } 877 void dec_in_deopt_handler() { 878 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 879 if (_in_deopt_handler > 0) { // robustness 880 _in_deopt_handler--; 881 } 882 } 883 884 private: 885 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 886 887 // factor out low-level mechanics for use in both normal and error cases 888 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 889 890 public: 891 892 // Frame iteration; calls the function f for all frames on the stack 893 void frames_do(void f(frame*, const RegisterMap*)); 894 895 // Memory operations 896 void oops_do_frames(OopClosure* f, CodeBlobClosure* cf); 897 void oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf); 898 899 // GC operations 900 virtual void nmethods_do(CodeBlobClosure* cf); 901 902 // RedefineClasses Support 903 void metadata_do(MetadataClosure* f); 904 905 // Debug method asserting thread states are correct during a handshake operation. 906 DEBUG_ONLY(void verify_states_for_handshake();) 907 908 // Misc. operations 909 const char* name() const; 910 const char* type_name() const { return "JavaThread"; } 911 static const char* name_for(oop thread_obj); 912 913 void print_on(outputStream* st, bool print_extended_info) const; 914 void print_on(outputStream* st) const { print_on(st, false); } 915 void print() const; 916 void print_thread_state_on(outputStream*) const; 917 void print_on_error(outputStream* st, char* buf, int buflen) const; 918 void print_name_on_error(outputStream* st, char* buf, int buflen) const; 919 void verify(); 920 921 // Accessing frames 922 frame last_frame() { 923 _anchor.make_walkable(); 924 return pd_last_frame(); 925 } 926 javaVFrame* last_java_vframe(RegisterMap* reg_map) { return last_java_vframe(last_frame(), reg_map); } 927 928 frame carrier_last_frame(RegisterMap* reg_map); 929 javaVFrame* carrier_last_java_vframe(RegisterMap* reg_map) { return last_java_vframe(carrier_last_frame(reg_map), reg_map); } 930 931 frame vthread_last_frame(); 932 javaVFrame* vthread_last_java_vframe(RegisterMap* reg_map) { return last_java_vframe(vthread_last_frame(), reg_map); } 933 934 frame platform_thread_last_frame(RegisterMap* reg_map); 935 javaVFrame* platform_thread_last_java_vframe(RegisterMap* reg_map) { 936 return last_java_vframe(platform_thread_last_frame(reg_map), reg_map); 937 } 938 939 javaVFrame* last_java_vframe(const frame f, RegisterMap* reg_map); 940 941 // Returns method at 'depth' java or native frames down the stack 942 // Used for security checks 943 Klass* security_get_caller_class(int depth); 944 945 // Print stack trace in external format 946 void print_stack_on(outputStream* st); 947 void print_stack() { print_stack_on(tty); } 948 949 // Print stack traces in various internal formats 950 void trace_stack() PRODUCT_RETURN; 951 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 952 void trace_frames() PRODUCT_RETURN; 953 954 // Print an annotated view of the stack frames 955 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 956 void validate_frame_layout() { 957 print_frame_layout(0, true); 958 } 959 960 // Function for testing deoptimization 961 void deoptimize(); 962 void make_zombies(); 963 964 void deoptimize_marked_methods(); 965 966 public: 967 // Returns the running thread as a JavaThread 968 static JavaThread* current() { 969 return JavaThread::cast(Thread::current()); 970 } 971 972 // Returns the current thread as a JavaThread, or NULL if not attached 973 static inline JavaThread* current_or_null(); 974 975 // Casts 976 static JavaThread* cast(Thread* t) { 977 assert(t->is_Java_thread(), "incorrect cast to JavaThread"); 978 return static_cast<JavaThread*>(t); 979 } 980 981 static const JavaThread* cast(const Thread* t) { 982 assert(t->is_Java_thread(), "incorrect cast to const JavaThread"); 983 return static_cast<const JavaThread*>(t); 984 } 985 986 // Returns the active Java thread. Do not use this if you know you are calling 987 // from a JavaThread, as it's slower than JavaThread::current. If called from 988 // the VMThread, it also returns the JavaThread that instigated the VMThread's 989 // operation. You may not want that either. 990 static JavaThread* active(); 991 992 protected: 993 virtual void pre_run(); 994 virtual void run(); 995 void thread_main_inner(); 996 virtual void post_run(); 997 998 public: 999 // Thread local information maintained by JVMTI. 1000 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1001 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1002 // getter is used to get this JavaThread's JvmtiThreadState if it has 1003 // one which means NULL can be returned. JvmtiThreadState::state_for() 1004 // is used to get the specified JavaThread's JvmtiThreadState if it has 1005 // one or it allocates a new JvmtiThreadState for the JavaThread and 1006 // returns it. JvmtiThreadState::state_for() will return NULL only if 1007 // the specified JavaThread is exiting. 1008 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1009 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1010 1011 #if INCLUDE_JVMTI 1012 // Rebind JVMTI thread state from carrier to virtual or from virtual to carrier. 1013 JvmtiThreadState *rebind_to_jvmti_thread_state_of(oop thread_oop); 1014 #endif 1015 1016 // JVMTI PopFrame support 1017 // Setting and clearing popframe_condition 1018 // All of these enumerated values are bits. popframe_pending 1019 // indicates that a PopFrame() has been requested and not yet been 1020 // completed. popframe_processing indicates that that PopFrame() is in 1021 // the process of being completed. popframe_force_deopt_reexecution_bit 1022 // indicates that special handling is required when returning to a 1023 // deoptimized caller. 1024 enum PopCondition { 1025 popframe_inactive = 0x00, 1026 popframe_pending_bit = 0x01, 1027 popframe_processing_bit = 0x02, 1028 popframe_force_deopt_reexecution_bit = 0x04 1029 }; 1030 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1031 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1032 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1033 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1034 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1035 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1036 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1037 1038 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1039 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1040 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1041 1042 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1043 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1044 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1045 1046 private: 1047 // Saved incoming arguments to popped frame. 1048 // Used only when popped interpreted frame returns to deoptimized frame. 1049 void* _popframe_preserved_args; 1050 int _popframe_preserved_args_size; 1051 1052 public: 1053 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1054 void* popframe_preserved_args(); 1055 ByteSize popframe_preserved_args_size(); 1056 WordSize popframe_preserved_args_size_in_words(); 1057 void popframe_free_preserved_args(); 1058 1059 1060 private: 1061 JvmtiThreadState *_jvmti_thread_state; 1062 1063 // Used by the interpreter in fullspeed mode for frame pop, method 1064 // entry, method exit and single stepping support. This field is 1065 // only set to non-zero at a safepoint or using a direct handshake 1066 // (see EnterInterpOnlyModeClosure). 1067 // It can be set to zero asynchronously to this threads execution (i.e., without 1068 // safepoint/handshake or a lock) so we have to be very careful. 1069 // Accesses by other threads are synchronized using JvmtiThreadState_lock though. 1070 int _interp_only_mode; 1071 1072 public: 1073 // used by the interpreter for fullspeed debugging support (see above) 1074 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1075 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1076 int get_interp_only_mode() { return _interp_only_mode; } 1077 int set_interp_only_mode(int val) { return _interp_only_mode = val; } 1078 void increment_interp_only_mode() { ++_interp_only_mode; } 1079 void decrement_interp_only_mode() { --_interp_only_mode; } 1080 1081 // support for cached flag that indicates whether exceptions need to be posted for this thread 1082 // if this is false, we can avoid deoptimizing when events are thrown 1083 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1084 private: 1085 int _should_post_on_exceptions_flag; 1086 1087 public: 1088 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1089 1090 private: 1091 ThreadStatistics *_thread_stat; 1092 1093 public: 1094 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1095 1096 // Return a blocker object for which this thread is blocked parking. 1097 oop current_park_blocker(); 1098 1099 private: 1100 static size_t _stack_size_at_create; 1101 1102 public: 1103 static inline size_t stack_size_at_create(void) { 1104 return _stack_size_at_create; 1105 } 1106 static inline void set_stack_size_at_create(size_t value) { 1107 _stack_size_at_create = value; 1108 } 1109 1110 // Machine dependent stuff 1111 #include OS_CPU_HEADER(javaThread) 1112 1113 // JSR166 per-thread parker 1114 private: 1115 Parker _parker; 1116 public: 1117 Parker* parker() { return &_parker; } 1118 1119 public: 1120 // clearing/querying jni attach status 1121 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1122 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1123 inline void set_done_attaching_via_jni(); 1124 1125 // Stack dump assistance: 1126 // Track the class we want to initialize but for which we have to wait 1127 // on its init_lock() because it is already being initialized. 1128 void set_class_to_be_initialized(InstanceKlass* k); 1129 InstanceKlass* class_to_be_initialized() const; 1130 1131 private: 1132 InstanceKlass* _class_to_be_initialized; 1133 1134 // java.lang.Thread.sleep support 1135 ParkEvent * _SleepEvent; 1136 public: 1137 bool sleep(jlong millis); 1138 1139 // java.lang.Thread interruption support 1140 void interrupt(); 1141 bool is_interrupted(bool clear_interrupted); 1142 1143 static OopStorage* thread_oop_storage(); 1144 1145 static void verify_cross_modify_fence_failure(JavaThread *thread) PRODUCT_RETURN; 1146 1147 // Helper function to create the java.lang.Thread object for a 1148 // VM-internal thread. The thread will have the given name, be 1149 // part of the System ThreadGroup and if is_visible is true will be 1150 // discoverable via the system ThreadGroup. 1151 static Handle create_system_thread_object(const char* name, bool is_visible, TRAPS); 1152 1153 // Helper function to start a VM-internal daemon thread. 1154 // E.g. ServiceThread, NotificationThread, CompilerThread etc. 1155 static void start_internal_daemon(JavaThread* current, JavaThread* target, 1156 Handle thread_oop, ThreadPriority prio); 1157 1158 // Helper function to do vm_exit_on_initialization for osthread 1159 // resource allocation failure. 1160 static void vm_exit_on_osthread_failure(JavaThread* thread); 1161 1162 // Deferred OopHandle release support 1163 private: 1164 // List of OopHandles to be released - guarded by the Service_lock. 1165 static OopHandleList* _oop_handle_list; 1166 // Add our OopHandles to the list for the service thread to release. 1167 void add_oop_handles_for_release(); 1168 // Called by the ServiceThread to release the OopHandles. 1169 static void release_oop_handles(); 1170 // Called by the ServiceThread to poll if there are any OopHandles to release. 1171 // Called when holding the Service_lock. 1172 static bool has_oop_handles_to_release() { 1173 return _oop_handle_list != nullptr; 1174 } 1175 }; 1176 1177 inline JavaThread* JavaThread::current_or_null() { 1178 Thread* current = Thread::current_or_null(); 1179 return current != nullptr ? JavaThread::cast(current) : nullptr; 1180 } 1181 1182 class UnlockFlagSaver { 1183 private: 1184 JavaThread* _thread; 1185 bool _do_not_unlock; 1186 public: 1187 UnlockFlagSaver(JavaThread* t) { 1188 _thread = t; 1189 _do_not_unlock = t->do_not_unlock_if_synchronized(); 1190 t->set_do_not_unlock_if_synchronized(false); 1191 } 1192 ~UnlockFlagSaver() { 1193 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock); 1194 } 1195 }; 1196 1197 class JNIHandleMark : public StackObj { 1198 JavaThread* _thread; 1199 public: 1200 JNIHandleMark(JavaThread* thread) : _thread(thread) { 1201 thread->push_jni_handle_block(); 1202 } 1203 ~JNIHandleMark() { _thread->pop_jni_handle_block(); } 1204 }; 1205 1206 #endif // SHARE_RUNTIME_JAVATHREAD_HPP