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_THREAD_HPP 27 #define SHARE_RUNTIME_THREAD_HPP 28 29 #include "jni.h" 30 #include "gc/shared/gcThreadLocalData.hpp" 31 #include "gc/shared/threadLocalAllocBuffer.hpp" 32 #include "memory/allocation.hpp" 33 #include "oops/oop.hpp" 34 #include "oops/oopHandle.hpp" 35 #include "runtime/frame.hpp" 36 #include "runtime/globals.hpp" 37 #include "runtime/handshake.hpp" 38 #include "runtime/javaFrameAnchor.hpp" 39 #include "runtime/mutexLocker.hpp" 40 #include "runtime/os.hpp" 41 #include "runtime/park.hpp" 42 #include "runtime/safepointMechanism.hpp" 43 #include "runtime/stackWatermarkSet.hpp" 44 #include "runtime/stackOverflow.hpp" 45 #include "runtime/threadHeapSampler.hpp" 46 #include "runtime/threadLocalStorage.hpp" 47 #include "runtime/threadStatisticalInfo.hpp" 48 #include "runtime/unhandledOops.hpp" 49 #include "utilities/align.hpp" 50 #include "utilities/exceptions.hpp" 51 #include "utilities/globalDefinitions.hpp" 52 #include "utilities/macros.hpp" 53 #if INCLUDE_JFR 54 #include "jfr/support/jfrThreadExtension.hpp" 55 #endif 56 57 class SafeThreadsListPtr; 58 class ThreadSafepointState; 59 class ThreadsList; 60 class ThreadsSMRSupport; 61 62 class JNIHandleBlock; 63 class JvmtiRawMonitor; 64 class JvmtiSampledObjectAllocEventCollector; 65 class JvmtiThreadState; 66 class JvmtiVMObjectAllocEventCollector; 67 class OSThread; 68 class ThreadStatistics; 69 class ConcurrentLocksDump; 70 class MonitorInfo; 71 72 class vframeArray; 73 class vframe; 74 class javaVFrame; 75 76 class DeoptResourceMark; 77 class JvmtiDeferredUpdates; 78 79 class ThreadClosure; 80 class ICRefillVerifier; 81 82 class Metadata; 83 class ResourceArea; 84 85 class OopStorage; 86 87 DEBUG_ONLY(class ResourceMark;) 88 89 class WorkerThread; 90 91 class JavaThread; 92 93 // Class hierarchy 94 // - Thread 95 // - JavaThread 96 // - various subclasses eg CompilerThread, ServiceThread 97 // - NonJavaThread 98 // - NamedThread 99 // - VMThread 100 // - ConcurrentGCThread 101 // - WorkerThread 102 // - WatcherThread 103 // - JfrThreadSampler 104 // - LogAsyncWriter 105 // 106 // All Thread subclasses must be either JavaThread or NonJavaThread. 107 // This means !t->is_Java_thread() iff t is a NonJavaThread, or t is 108 // a partially constructed/destroyed Thread. 109 110 // Thread execution sequence and actions: 111 // All threads: 112 // - thread_native_entry // per-OS native entry point 113 // - stack initialization 114 // - other OS-level initialization (signal masks etc) 115 // - handshake with creating thread (if not started suspended) 116 // - this->call_run() // common shared entry point 117 // - shared common initialization 118 // - this->pre_run() // virtual per-thread-type initialization 119 // - this->run() // virtual per-thread-type "main" logic 120 // - shared common tear-down 121 // - this->post_run() // virtual per-thread-type tear-down 122 // - // 'this' no longer referenceable 123 // - OS-level tear-down (minimal) 124 // - final logging 125 // 126 // For JavaThread: 127 // - this->run() // virtual but not normally overridden 128 // - this->thread_main_inner() // extra call level to ensure correct stack calculations 129 // - this->entry_point() // set differently for each kind of JavaThread 130 131 class Thread: public ThreadShadow { 132 friend class VMStructs; 133 friend class JVMCIVMStructs; 134 private: 135 136 #ifndef USE_LIBRARY_BASED_TLS_ONLY 137 // Current thread is maintained as a thread-local variable 138 static THREAD_LOCAL Thread* _thr_current; 139 #endif 140 141 // Thread local data area available to the GC. The internal 142 // structure and contents of this data area is GC-specific. 143 // Only GC and GC barrier code should access this data area. 144 GCThreadLocalData _gc_data; 145 146 public: 147 static ByteSize gc_data_offset() { 148 return byte_offset_of(Thread, _gc_data); 149 } 150 151 template <typename T> T* gc_data() { 152 STATIC_ASSERT(sizeof(T) <= sizeof(_gc_data)); 153 return reinterpret_cast<T*>(&_gc_data); 154 } 155 156 // Exception handling 157 // (Note: _pending_exception and friends are in ThreadShadow) 158 //oop _pending_exception; // pending exception for current thread 159 // const char* _exception_file; // file information for exception (debugging only) 160 // int _exception_line; // line information for exception (debugging only) 161 protected: 162 163 DEBUG_ONLY(static Thread* _starting_thread;) 164 165 // JavaThread lifecycle support: 166 friend class SafeThreadsListPtr; // for _threads_list_ptr, cmpxchg_threads_hazard_ptr(), {dec_,inc_,}nested_threads_hazard_ptr_cnt(), {g,s}et_threads_hazard_ptr(), inc_nested_handle_cnt(), tag_hazard_ptr() access 167 friend class ScanHazardPtrGatherProtectedThreadsClosure; // for cmpxchg_threads_hazard_ptr(), get_threads_hazard_ptr(), is_hazard_ptr_tagged() access 168 friend class ScanHazardPtrGatherThreadsListClosure; // for get_threads_hazard_ptr(), untag_hazard_ptr() access 169 friend class ScanHazardPtrPrintMatchingThreadsClosure; // for get_threads_hazard_ptr(), is_hazard_ptr_tagged() access 170 friend class ThreadsSMRSupport; // for _nested_threads_hazard_ptr_cnt, _threads_hazard_ptr, _threads_list_ptr access 171 friend class ThreadsListHandleTest; // for _nested_threads_hazard_ptr_cnt, _threads_hazard_ptr, _threads_list_ptr access 172 friend class ValidateHazardPtrsClosure; // for get_threads_hazard_ptr(), untag_hazard_ptr() access 173 174 ThreadsList* volatile _threads_hazard_ptr; 175 SafeThreadsListPtr* _threads_list_ptr; 176 ThreadsList* cmpxchg_threads_hazard_ptr(ThreadsList* exchange_value, ThreadsList* compare_value); 177 ThreadsList* get_threads_hazard_ptr() const; 178 void set_threads_hazard_ptr(ThreadsList* new_list); 179 static bool is_hazard_ptr_tagged(ThreadsList* list) { 180 return (intptr_t(list) & intptr_t(1)) == intptr_t(1); 181 } 182 static ThreadsList* tag_hazard_ptr(ThreadsList* list) { 183 return (ThreadsList*)(intptr_t(list) | intptr_t(1)); 184 } 185 static ThreadsList* untag_hazard_ptr(ThreadsList* list) { 186 return (ThreadsList*)(intptr_t(list) & ~intptr_t(1)); 187 } 188 // This field is enabled via -XX:+EnableThreadSMRStatistics: 189 uint _nested_threads_hazard_ptr_cnt; 190 void dec_nested_threads_hazard_ptr_cnt() { 191 assert(_nested_threads_hazard_ptr_cnt != 0, "mismatched {dec,inc}_nested_threads_hazard_ptr_cnt()"); 192 _nested_threads_hazard_ptr_cnt--; 193 } 194 void inc_nested_threads_hazard_ptr_cnt() { 195 _nested_threads_hazard_ptr_cnt++; 196 } 197 uint nested_threads_hazard_ptr_cnt() { 198 return _nested_threads_hazard_ptr_cnt; 199 } 200 201 public: 202 // Is the target JavaThread protected by the calling Thread or by some other 203 // mechanism? 204 static bool is_JavaThread_protected(const JavaThread* target); 205 // Is the target JavaThread protected by a ThreadsListHandle (TLH) associated 206 // with the calling Thread? 207 static bool is_JavaThread_protected_by_TLH(const JavaThread* target); 208 209 void* operator new(size_t size) throw() { return allocate(size, true); } 210 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 211 return allocate(size, false); } 212 void operator delete(void* p); 213 214 protected: 215 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 216 217 private: 218 DEBUG_ONLY(bool _suspendible_thread;) 219 220 public: 221 // Determines if a heap allocation failure will be retried 222 // (e.g., by deoptimizing and re-executing in the interpreter). 223 // In this case, the failed allocation must raise 224 // Universe::out_of_memory_error_retry() and omit side effects 225 // such as JVMTI events and handling -XX:+HeapDumpOnOutOfMemoryError 226 // and -XX:OnOutOfMemoryError. 227 virtual bool in_retryable_allocation() const { return false; } 228 229 #ifdef ASSERT 230 void set_suspendible_thread() { 231 _suspendible_thread = true; 232 } 233 234 void clear_suspendible_thread() { 235 _suspendible_thread = false; 236 } 237 238 bool is_suspendible_thread() { return _suspendible_thread; } 239 #endif 240 241 private: 242 // Point to the last handle mark 243 HandleMark* _last_handle_mark; 244 245 // Claim value for parallel iteration over threads. 246 uintx _threads_do_token; 247 248 // Support for GlobalCounter 249 private: 250 volatile uintx _rcu_counter; 251 public: 252 volatile uintx* get_rcu_counter() { 253 return &_rcu_counter; 254 } 255 256 public: 257 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 258 HandleMark* last_handle_mark() const { return _last_handle_mark; } 259 private: 260 261 #ifdef ASSERT 262 ICRefillVerifier* _missed_ic_stub_refill_verifier; 263 264 public: 265 ICRefillVerifier* missed_ic_stub_refill_verifier() { 266 return _missed_ic_stub_refill_verifier; 267 } 268 269 void set_missed_ic_stub_refill_verifier(ICRefillVerifier* verifier) { 270 _missed_ic_stub_refill_verifier = verifier; 271 } 272 #endif // ASSERT 273 274 private: 275 // Used by SkipGCALot class. 276 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 277 278 friend class GCLocker; 279 280 private: 281 ThreadLocalAllocBuffer _tlab; // Thread-local eden 282 jlong _allocated_bytes; // Cumulative number of bytes allocated on 283 // the Java heap 284 ThreadHeapSampler _heap_sampler; // For use when sampling the memory. 285 286 ThreadStatisticalInfo _statistical_info; // Statistics about the thread 287 288 JFR_ONLY(DEFINE_THREAD_LOCAL_FIELD_JFR;) // Thread-local data for jfr 289 290 JvmtiRawMonitor* _current_pending_raw_monitor; // JvmtiRawMonitor this thread 291 // is waiting to lock 292 public: 293 // Constructor 294 Thread(); 295 virtual ~Thread() = 0; // Thread is abstract. 296 297 // Manage Thread::current() 298 void initialize_thread_current(); 299 static void clear_thread_current(); // TLS cleanup needed before threads terminate 300 301 protected: 302 // To be implemented by children. 303 virtual void run() = 0; 304 virtual void pre_run() = 0; 305 virtual void post_run() = 0; // Note: Thread must not be deleted prior to calling this! 306 307 #ifdef ASSERT 308 enum RunState { 309 PRE_CALL_RUN, 310 CALL_RUN, 311 PRE_RUN, 312 RUN, 313 POST_RUN 314 // POST_CALL_RUN - can't define this one as 'this' may be deleted when we want to set it 315 }; 316 RunState _run_state; // for lifecycle checks 317 #endif 318 319 320 public: 321 // invokes <ChildThreadClass>::run(), with common preparations and cleanups. 322 void call_run(); 323 324 // Testers 325 virtual bool is_VM_thread() const { return false; } 326 virtual bool is_Java_thread() const { return false; } 327 virtual bool is_Compiler_thread() const { return false; } 328 virtual bool is_Code_cache_sweeper_thread() const { return false; } 329 virtual bool is_service_thread() const { return false; } 330 virtual bool is_monitor_deflation_thread() const { return false; } 331 virtual bool is_hidden_from_external_view() const { return false; } 332 virtual bool is_jvmti_agent_thread() const { return false; } 333 virtual bool is_Watcher_thread() const { return false; } 334 virtual bool is_ConcurrentGC_thread() const { return false; } 335 virtual bool is_Named_thread() const { return false; } 336 virtual bool is_Worker_thread() const { return false; } 337 virtual bool is_JfrSampler_thread() const { return false; } 338 339 // Can this thread make Java upcalls 340 virtual bool can_call_java() const { return false; } 341 342 // Is this a JavaThread that is on the VM's current ThreadsList? 343 // If so it must participate in the safepoint protocol. 344 virtual bool is_active_Java_thread() const { return false; } 345 346 // All threads are given names. For singleton subclasses we can 347 // just hard-wire the known name of the instance. JavaThreads and 348 // NamedThreads support multiple named instances, and dynamic 349 // changing of the name of an instance. 350 virtual const char* name() const { return "Unknown thread"; } 351 352 // A thread's type name is also made available for debugging 353 // and logging. 354 virtual const char* type_name() const { return "Thread"; } 355 356 // Returns the current thread (ASSERTS if NULL) 357 static inline Thread* current(); 358 // Returns the current thread, or NULL if not attached 359 static inline Thread* current_or_null(); 360 // Returns the current thread, or NULL if not attached, and is 361 // safe for use from signal-handlers 362 static inline Thread* current_or_null_safe(); 363 364 // Common thread operations 365 #ifdef ASSERT 366 static void check_for_dangling_thread_pointer(Thread *thread); 367 #endif 368 static void set_priority(Thread* thread, ThreadPriority priority); 369 static ThreadPriority get_priority(const Thread* const thread); 370 static void start(Thread* thread); 371 372 void set_native_thread_name(const char *name) { 373 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); 374 os::set_native_thread_name(name); 375 } 376 377 // Support for Unhandled Oop detection 378 // Add the field for both, fastdebug and debug, builds to keep 379 // Thread's fields layout the same. 380 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build. 381 #ifdef CHECK_UNHANDLED_OOPS 382 private: 383 UnhandledOops* _unhandled_oops; 384 #elif defined(ASSERT) 385 private: 386 void* _unhandled_oops; 387 #endif 388 #ifdef CHECK_UNHANDLED_OOPS 389 public: 390 UnhandledOops* unhandled_oops() { return _unhandled_oops; } 391 // Mark oop safe for gc. It may be stack allocated but won't move. 392 void allow_unhandled_oop(oop *op) { 393 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); 394 } 395 // Clear oops at safepoint so crashes point to unhandled oop violator 396 void clear_unhandled_oops() { 397 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); 398 } 399 #endif // CHECK_UNHANDLED_OOPS 400 401 public: 402 #ifndef PRODUCT 403 bool skip_gcalot() { return _skip_gcalot; } 404 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 405 #endif 406 407 // Resource area 408 ResourceArea* resource_area() const { return _resource_area; } 409 void set_resource_area(ResourceArea* area) { _resource_area = area; } 410 411 OSThread* osthread() const { return _osthread; } 412 void set_osthread(OSThread* thread) { _osthread = thread; } 413 414 // Internal handle support 415 HandleArea* handle_area() const { return _handle_area; } 416 void set_handle_area(HandleArea* area) { _handle_area = area; } 417 418 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 419 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 420 421 // Thread-Local Allocation Buffer (TLAB) support 422 ThreadLocalAllocBuffer& tlab() { return _tlab; } 423 void initialize_tlab(); 424 425 jlong allocated_bytes() { return _allocated_bytes; } 426 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 427 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 428 inline jlong cooked_allocated_bytes(); 429 430 ThreadHeapSampler& heap_sampler() { return _heap_sampler; } 431 432 ThreadStatisticalInfo& statistical_info() { return _statistical_info; } 433 434 JFR_ONLY(DEFINE_THREAD_LOCAL_ACCESSOR_JFR;) 435 436 // For tracking the Jvmti raw monitor the thread is pending on. 437 JvmtiRawMonitor* current_pending_raw_monitor() { 438 return _current_pending_raw_monitor; 439 } 440 void set_current_pending_raw_monitor(JvmtiRawMonitor* monitor) { 441 _current_pending_raw_monitor = monitor; 442 } 443 444 // GC support 445 // Apply "f->do_oop" to all root oops in "this". 446 // Used by JavaThread::oops_do. 447 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 448 virtual void oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf); 449 virtual void oops_do_frames(OopClosure* f, CodeBlobClosure* cf) {} 450 void oops_do(OopClosure* f, CodeBlobClosure* cf); 451 452 // Handles the parallel case for claim_threads_do. 453 private: 454 bool claim_par_threads_do(uintx claim_token); 455 public: 456 // Requires that "claim_token" is that of the current iteration. 457 // If "is_par" is false, sets the token of "this" to 458 // "claim_token", and returns "true". If "is_par" is true, 459 // uses an atomic instruction to set the current thread's token to 460 // "claim_token", if it is not already. Returns "true" iff the 461 // calling thread does the update, this indicates that the calling thread 462 // has claimed the thread in the current iteration. 463 bool claim_threads_do(bool is_par, uintx claim_token) { 464 if (!is_par) { 465 _threads_do_token = claim_token; 466 return true; 467 } else { 468 return claim_par_threads_do(claim_token); 469 } 470 } 471 472 uintx threads_do_token() const { return _threads_do_token; } 473 474 // jvmtiRedefineClasses support 475 void metadata_handles_do(void f(Metadata*)); 476 477 private: 478 // Check if address is within the given range of this thread's 479 // stack: stack_base() > adr >/>= limit 480 // The check is inclusive of limit if passed true, else exclusive. 481 bool is_in_stack_range(address adr, address limit, bool inclusive) const { 482 assert(stack_base() > limit && limit >= stack_end(), "limit is outside of stack"); 483 return stack_base() > adr && (inclusive ? adr >= limit : adr > limit); 484 } 485 486 public: 487 // Used by fast lock support 488 virtual bool is_lock_owned(address adr) const; 489 490 // Check if address is within the given range of this thread's 491 // stack: stack_base() > adr >= limit 492 bool is_in_stack_range_incl(address adr, address limit) const { 493 return is_in_stack_range(adr, limit, true); 494 } 495 496 // Check if address is within the given range of this thread's 497 // stack: stack_base() > adr > limit 498 bool is_in_stack_range_excl(address adr, address limit) const { 499 return is_in_stack_range(adr, limit, false); 500 } 501 502 // Check if address is in the stack mapped to this thread. Used mainly in 503 // error reporting (so has to include guard zone) and frame printing. 504 // Expects _stack_base to be initialized - checked with assert. 505 bool is_in_full_stack_checked(address adr) const { 506 return is_in_stack_range_incl(adr, stack_end()); 507 } 508 509 // Like is_in_full_stack_checked but without the assertions as this 510 // may be called in a thread before _stack_base is initialized. 511 bool is_in_full_stack(address adr) const { 512 address stack_end = _stack_base - _stack_size; 513 return _stack_base > adr && adr >= stack_end; 514 } 515 516 // Check if address is in the live stack of this thread (not just for locks). 517 // Warning: can only be called by the current thread on itself. 518 bool is_in_live_stack(address adr) const { 519 assert(Thread::current() == this, "is_in_live_stack can only be called from current thread"); 520 return is_in_stack_range_incl(adr, os::current_stack_pointer()); 521 } 522 523 // Sets this thread as starting thread. Returns failure if thread 524 // creation fails due to lack of memory, too many threads etc. 525 bool set_as_starting_thread(); 526 527 protected: 528 // OS data associated with the thread 529 OSThread* _osthread; // Platform-specific thread information 530 531 // Thread local resource area for temporary allocation within the VM 532 ResourceArea* _resource_area; 533 534 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 535 536 // Thread local handle area for allocation of handles within the VM 537 HandleArea* _handle_area; 538 GrowableArray<Metadata*>* _metadata_handles; 539 540 // Support for stack overflow handling, get_thread, etc. 541 address _stack_base; 542 size_t _stack_size; 543 int _lgrp_id; 544 545 public: 546 // Stack overflow support 547 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 548 void set_stack_base(address base) { _stack_base = base; } 549 size_t stack_size() const { return _stack_size; } 550 void set_stack_size(size_t size) { _stack_size = size; } 551 address stack_end() const { return stack_base() - stack_size(); } 552 void record_stack_base_and_size(); 553 void register_thread_stack_with_NMT(); 554 void unregister_thread_stack_with_NMT(); 555 556 int lgrp_id() const { return _lgrp_id; } 557 void set_lgrp_id(int value) { _lgrp_id = value; } 558 559 // Printing 560 void print_on(outputStream* st, bool print_extended_info) const; 561 virtual void print_on(outputStream* st) const { print_on(st, false); } 562 void print() const; 563 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 564 // Basic, non-virtual, printing support that is simple and always safe. 565 void print_value_on(outputStream* st) const; 566 567 // Debug-only code 568 #ifdef ASSERT 569 private: 570 // Deadlock detection support for Mutex locks. List of locks own by thread. 571 Mutex* _owned_locks; 572 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 573 // thus the friendship 574 friend class Mutex; 575 friend class Monitor; 576 577 public: 578 void print_owned_locks_on(outputStream* st) const; 579 void print_owned_locks() const { print_owned_locks_on(tty); } 580 Mutex* owned_locks() const { return _owned_locks; } 581 bool owns_locks() const { return owned_locks() != NULL; } 582 583 // Deadlock detection 584 ResourceMark* current_resource_mark() { return _current_resource_mark; } 585 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 586 #endif // ASSERT 587 588 private: 589 volatile int _jvmti_env_iteration_count; 590 591 public: 592 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 593 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 594 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 595 596 // Code generation 597 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); } 598 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); } 599 600 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); } 601 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); } 602 603 static ByteSize tlab_start_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::start_offset(); } 604 static ByteSize tlab_end_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::end_offset(); } 605 static ByteSize tlab_top_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::top_offset(); } 606 static ByteSize tlab_pf_top_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::pf_top_offset(); } 607 608 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); } 609 610 JFR_ONLY(DEFINE_THREAD_LOCAL_OFFSET_JFR;) 611 612 public: 613 ParkEvent * volatile _ParkEvent; // for Object monitors, JVMTI raw monitors, 614 // and ObjectSynchronizer::read_stable_mark 615 616 // Termination indicator used by the signal handler. 617 // _ParkEvent is just a convenient field we can NULL out after setting the JavaThread termination state 618 // (which can't itself be read from the signal handler if a signal hits during the Thread destructor). 619 bool has_terminated() { return Atomic::load(&_ParkEvent) == NULL; }; 620 621 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG 622 jint _hashStateX; // thread-specific hashCode generator state 623 jint _hashStateY; 624 jint _hashStateZ; 625 626 // Low-level leaf-lock primitives used to implement synchronization. 627 // Not for general synchronization use. 628 static void SpinAcquire(volatile int * Lock, const char * Name); 629 static void SpinRelease(volatile int * Lock); 630 631 #if defined(__APPLE__) && defined(AARCH64) 632 private: 633 DEBUG_ONLY(bool _wx_init); 634 WXMode _wx_state; 635 public: 636 void init_wx(); 637 WXMode enable_wx(WXMode new_state); 638 639 void assert_wx_state(WXMode expected) { 640 assert(_wx_state == expected, "wrong state"); 641 } 642 #endif // __APPLE__ && AARCH64 643 }; 644 645 // Inline implementation of Thread::current() 646 inline Thread* Thread::current() { 647 Thread* current = current_or_null(); 648 assert(current != NULL, "Thread::current() called on detached thread"); 649 return current; 650 } 651 652 inline Thread* Thread::current_or_null() { 653 #ifndef USE_LIBRARY_BASED_TLS_ONLY 654 return _thr_current; 655 #else 656 if (ThreadLocalStorage::is_initialized()) { 657 return ThreadLocalStorage::thread(); 658 } 659 return NULL; 660 #endif 661 } 662 663 inline Thread* Thread::current_or_null_safe() { 664 if (ThreadLocalStorage::is_initialized()) { 665 return ThreadLocalStorage::thread(); 666 } 667 return NULL; 668 } 669 670 class CompilerThread; 671 672 typedef void (*ThreadFunction)(JavaThread*, TRAPS); 673 674 class JavaThread: public Thread { 675 friend class VMStructs; 676 friend class JVMCIVMStructs; 677 friend class WhiteBox; 678 friend class VTBuffer; 679 friend class ThreadsSMRSupport; // to access _threadObj for exiting_threads_oops_do 680 friend class HandshakeState; 681 private: 682 bool _on_thread_list; // Is set when this JavaThread is added to the Threads list 683 OopHandle _threadObj; // The Java level thread object 684 685 #ifdef ASSERT 686 private: 687 int _java_call_counter; 688 689 public: 690 int java_call_counter() { return _java_call_counter; } 691 void inc_java_call_counter() { _java_call_counter++; } 692 void dec_java_call_counter() { 693 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 694 _java_call_counter--; 695 } 696 private: // restore original namespace restriction 697 #endif // ifdef ASSERT 698 699 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 700 701 ThreadFunction _entry_point; 702 703 JNIEnv _jni_environment; 704 705 // Deopt support 706 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 707 708 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized 709 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 710 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 711 // Holds updates by JVMTI agents for compiled frames that cannot be performed immediately. They 712 // will be carried out as soon as possible which, in most cases, is just before deoptimization of 713 // the frame, when control returns to it. 714 JvmtiDeferredUpdates* _jvmti_deferred_updates; 715 716 // Handshake value for fixing 6243940. We need a place for the i2c 717 // adapter to store the callee Method*. This value is NEVER live 718 // across a gc point so it does NOT have to be gc'd 719 // The handshake is open ended since we can't be certain that it will 720 // be NULLed. This is because we rarely ever see the race and end up 721 // in handle_wrong_method which is the backend of the handshake. See 722 // code in i2c adapters and handle_wrong_method. 723 724 Method* _callee_target; 725 726 // Used to pass back results to the interpreter or generated code running Java code. 727 oop _vm_result; // oop result is GC-preserved 728 Metadata* _vm_result_2; // non-oop result 729 oop _return_buffered_value; // buffered value being returned 730 731 // See ReduceInitialCardMarks: this holds the precise space interval of 732 // the most recent slow path allocation for which compiled code has 733 // elided card-marks for performance along the fast-path. 734 MemRegion _deferred_card_mark; 735 736 ObjectMonitor* volatile _current_pending_monitor; // ObjectMonitor this thread is waiting to lock 737 bool _current_pending_monitor_is_from_java; // locking is from Java code 738 ObjectMonitor* volatile _current_waiting_monitor; // ObjectMonitor on which this thread called Object.wait() 739 740 // Active_handles points to a block of handles 741 JNIHandleBlock* _active_handles; 742 743 // One-element thread local free list 744 JNIHandleBlock* _free_handle_block; 745 746 public: 747 volatile intptr_t _Stalled; 748 749 // For tracking the heavyweight monitor the thread is pending on. 750 ObjectMonitor* current_pending_monitor() { 751 // Use Atomic::load() to prevent data race between concurrent modification and 752 // concurrent readers, e.g. ThreadService::get_current_contended_monitor(). 753 // Especially, reloading pointer from thread after NULL check must be prevented. 754 return Atomic::load(&_current_pending_monitor); 755 } 756 void set_current_pending_monitor(ObjectMonitor* monitor) { 757 Atomic::store(&_current_pending_monitor, monitor); 758 } 759 void set_current_pending_monitor_is_from_java(bool from_java) { 760 _current_pending_monitor_is_from_java = from_java; 761 } 762 bool current_pending_monitor_is_from_java() { 763 return _current_pending_monitor_is_from_java; 764 } 765 ObjectMonitor* current_waiting_monitor() { 766 // See the comment in current_pending_monitor() above. 767 return Atomic::load(&_current_waiting_monitor); 768 } 769 void set_current_waiting_monitor(ObjectMonitor* monitor) { 770 Atomic::store(&_current_waiting_monitor, monitor); 771 } 772 773 // JNI handle support 774 JNIHandleBlock* active_handles() const { return _active_handles; } 775 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 776 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 777 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 778 779 void push_jni_handle_block(); 780 void pop_jni_handle_block(); 781 782 private: 783 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 784 // allocated during deoptimization 785 // and by JNI_MonitorEnter/Exit 786 787 enum SuspendFlags { 788 // NOTE: avoid using the sign-bit as cc generates different test code 789 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 790 _has_async_exception = 0x00000001U, // there is a pending async exception 791 _async_delivery_disabled = 0x00000002U, // async exception delivery is disabled 792 _trace_flag = 0x00000004U, // call tracing backend 793 _obj_deopt = 0x00000008U // suspend for object reallocation and relocking for JVMTI agent 794 }; 795 796 // various suspension related flags - atomically updated 797 // overloaded with async exceptions so that we do a single check when transitioning from native->Java 798 volatile uint32_t _suspend_flags; 799 800 inline void set_suspend_flag(SuspendFlags f); 801 inline void clear_suspend_flag(SuspendFlags f); 802 803 public: 804 inline void set_trace_flag(); 805 inline void clear_trace_flag(); 806 inline void set_obj_deopt_flag(); 807 inline void clear_obj_deopt_flag(); 808 bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; } 809 bool is_obj_deopt_suspend() { return (_suspend_flags & _obj_deopt) != 0; } 810 811 // Asynchronous exceptions support 812 private: 813 oop _pending_async_exception; 814 #ifdef ASSERT 815 bool _is_unsafe_access_error; 816 #endif 817 818 inline bool clear_async_exception_condition(); 819 public: 820 bool has_async_exception_condition() { 821 return (_suspend_flags & _has_async_exception) != 0 && 822 (_suspend_flags & _async_delivery_disabled) == 0; 823 } 824 inline void set_pending_async_exception(oop e); 825 inline void set_pending_unsafe_access_error(); 826 static void send_async_exception(JavaThread* jt, oop java_throwable); 827 void send_thread_stop(oop throwable); 828 void check_and_handle_async_exceptions(); 829 830 class NoAsyncExceptionDeliveryMark : public StackObj { 831 friend JavaThread; 832 JavaThread *_target; 833 inline NoAsyncExceptionDeliveryMark(JavaThread *t); 834 inline ~NoAsyncExceptionDeliveryMark(); 835 }; 836 837 // Safepoint support 838 public: // Expose _thread_state for SafeFetchInt() 839 volatile JavaThreadState _thread_state; 840 private: 841 SafepointMechanism::ThreadData _poll_data; 842 ThreadSafepointState* _safepoint_state; // Holds information about a thread during a safepoint 843 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 844 NOT_PRODUCT(bool _requires_cross_modify_fence;) // State used by VerifyCrossModifyFence 845 #ifdef ASSERT 846 // Debug support for checking if code allows safepoints or not. 847 // Safepoints in the VM can happen because of allocation, invoking a VM operation, or blocking on 848 // mutex, or blocking on an object synchronizer (Java locking). 849 // If _no_safepoint_count is non-zero, then an assertion failure will happen in any of 850 // the above cases. The class NoSafepointVerifier is used to set this counter. 851 int _no_safepoint_count; // If 0, thread allow a safepoint to happen 852 853 public: 854 void inc_no_safepoint_count() { _no_safepoint_count++; } 855 void dec_no_safepoint_count() { _no_safepoint_count--; } 856 #endif // ASSERT 857 public: 858 // These functions check conditions before possibly going to a safepoint. 859 // including NoSafepointVerifier. 860 void check_for_valid_safepoint_state() NOT_DEBUG_RETURN; 861 void check_possible_safepoint() NOT_DEBUG_RETURN; 862 863 #ifdef ASSERT 864 private: 865 volatile uint64_t _visited_for_critical_count; 866 867 public: 868 void set_visited_for_critical_count(uint64_t safepoint_id) { 869 assert(_visited_for_critical_count == 0, "Must be reset before set"); 870 assert((safepoint_id & 0x1) == 1, "Must be odd"); 871 _visited_for_critical_count = safepoint_id; 872 } 873 void reset_visited_for_critical_count(uint64_t safepoint_id) { 874 assert(_visited_for_critical_count == safepoint_id, "Was not visited"); 875 _visited_for_critical_count = 0; 876 } 877 bool was_visited_for_critical_count(uint64_t safepoint_id) const { 878 return _visited_for_critical_count == safepoint_id; 879 } 880 #endif // ASSERT 881 882 // JavaThread termination support 883 public: 884 enum TerminatedTypes { 885 _not_terminated = 0xDEAD - 2, 886 _thread_exiting, // JavaThread::exit() has been called for this thread 887 _thread_terminated, // JavaThread is removed from thread list 888 _vm_exited // JavaThread is still executing native code, but VM is terminated 889 // only VM_Exit can set _vm_exited 890 }; 891 892 private: 893 // In general a JavaThread's _terminated field transitions as follows: 894 // 895 // _not_terminated => _thread_exiting => _thread_terminated 896 // 897 // _vm_exited is a special value to cover the case of a JavaThread 898 // executing native code after the VM itself is terminated. 899 volatile TerminatedTypes _terminated; 900 901 jint _in_deopt_handler; // count of deoptimization 902 // handlers thread is in 903 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 904 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 905 // never locked) when throwing an exception. Used by interpreter only. 906 907 // JNI attach states: 908 enum JNIAttachStates { 909 _not_attaching_via_jni = 1, // thread is not attaching via JNI 910 _attaching_via_jni, // thread is attaching via JNI 911 _attached_via_jni // thread has attached via JNI 912 }; 913 914 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 915 // A native thread that is attaching via JNI starts with a value 916 // of _attaching_via_jni and transitions to _attached_via_jni. 917 volatile JNIAttachStates _jni_attach_state; 918 919 920 #if INCLUDE_JVMCI 921 // The _pending_* fields below are used to communicate extra information 922 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. 923 924 // Communicates the DeoptReason and DeoptAction of the uncommon trap 925 int _pending_deoptimization; 926 927 // Specifies whether the uncommon trap is to bci 0 of a synchronized method 928 // before the monitor has been acquired. 929 bool _pending_monitorenter; 930 931 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter 932 bool _pending_transfer_to_interpreter; 933 934 // True if in a runtime call from compiled code that will deoptimize 935 // and re-execute a failed heap allocation in the interpreter. 936 bool _in_retryable_allocation; 937 938 // An id of a speculation that JVMCI compiled code can use to further describe and 939 // uniquely identify the speculative optimization guarded by an uncommon trap. 940 // See JVMCINMethodData::SPECULATION_LENGTH_BITS for further details. 941 jlong _pending_failed_speculation; 942 943 // These fields are mutually exclusive in terms of live ranges. 944 union { 945 // Communicates the pc at which the most recent implicit exception occurred 946 // from the signal handler to a deoptimization stub. 947 address _implicit_exception_pc; 948 949 // Communicates an alternative call target to an i2c stub from a JavaCall . 950 address _alternate_call_target; 951 } _jvmci; 952 953 // Support for high precision, thread sensitive counters in JVMCI compiled code. 954 jlong* _jvmci_counters; 955 956 // Fast thread locals for use by JVMCI 957 jlong _jvmci_reserved0; 958 jlong _jvmci_reserved1; 959 oop _jvmci_reserved_oop0; 960 961 public: 962 static jlong* _jvmci_old_thread_counters; 963 static void collect_counters(jlong* array, int length); 964 965 bool resize_counters(int current_size, int new_size); 966 967 static bool resize_all_jvmci_counters(int new_size); 968 969 void set_jvmci_reserved_oop0(oop value) { 970 _jvmci_reserved_oop0 = value; 971 } 972 973 oop get_jvmci_reserved_oop0() { 974 return _jvmci_reserved_oop0; 975 } 976 977 void set_jvmci_reserved0(jlong value) { 978 _jvmci_reserved0 = value; 979 } 980 981 jlong get_jvmci_reserved0() { 982 return _jvmci_reserved0; 983 } 984 985 void set_jvmci_reserved1(jlong value) { 986 _jvmci_reserved1 = value; 987 } 988 989 jlong get_jvmci_reserved1() { 990 return _jvmci_reserved1; 991 } 992 993 private: 994 #endif // INCLUDE_JVMCI 995 996 StackOverflow _stack_overflow_state; 997 998 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 999 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 1000 // code) 1001 volatile oop _exception_oop; // Exception thrown in compiled code 1002 volatile address _exception_pc; // PC where exception happened 1003 volatile address _exception_handler_pc; // PC for handler of exception 1004 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 1005 1006 private: 1007 // support for JNI critical regions 1008 jint _jni_active_critical; // count of entries into JNI critical region 1009 1010 // Checked JNI: function name requires exception check 1011 char* _pending_jni_exception_check_fn; 1012 1013 // For deadlock detection. 1014 int _depth_first_number; 1015 1016 // JVMTI PopFrame support 1017 // This is set to popframe_pending to signal that top Java frame should be popped immediately 1018 int _popframe_condition; 1019 1020 // If reallocation of scalar replaced objects fails, we throw OOM 1021 // and during exception propagation, pop the top 1022 // _frames_to_pop_failed_realloc frames, the ones that reference 1023 // failed reallocations. 1024 int _frames_to_pop_failed_realloc; 1025 1026 friend class VMThread; 1027 friend class ThreadWaitTransition; 1028 friend class VM_Exit; 1029 1030 // Stack watermark barriers. 1031 StackWatermarks _stack_watermarks; 1032 1033 public: 1034 inline StackWatermarks* stack_watermarks() { return &_stack_watermarks; } 1035 1036 public: 1037 // Constructor 1038 JavaThread(); // delegating constructor 1039 JavaThread(bool is_attaching_via_jni); // for main thread and JNI attached threads 1040 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 1041 ~JavaThread(); 1042 1043 #ifdef ASSERT 1044 // verify this JavaThread hasn't be published in the Threads::list yet 1045 void verify_not_published(); 1046 #endif // ASSERT 1047 1048 StackOverflow* stack_overflow_state() { return &_stack_overflow_state; } 1049 1050 //JNI functiontable getter/setter for JVMTI jni function table interception API. 1051 void set_jni_functions(struct JNINativeInterface_* functionTable) { 1052 _jni_environment.functions = functionTable; 1053 } 1054 struct JNINativeInterface_* get_jni_functions() { 1055 return (struct JNINativeInterface_ *)_jni_environment.functions; 1056 } 1057 1058 // This function is called at thread creation to allow 1059 // platform specific thread variables to be initialized. 1060 void cache_global_variables(); 1061 1062 // Executes Shutdown.shutdown() 1063 void invoke_shutdown_hooks(); 1064 1065 // Cleanup on thread exit 1066 enum ExitType { 1067 normal_exit, 1068 jni_detach 1069 }; 1070 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 1071 1072 void cleanup_failed_attach_current_thread(bool is_daemon); 1073 1074 // Testers 1075 virtual bool is_Java_thread() const { return true; } 1076 virtual bool can_call_java() const { return true; } 1077 1078 virtual bool is_active_Java_thread() const { 1079 return on_thread_list() && !is_terminated(); 1080 } 1081 1082 // Thread oop. threadObj() can be NULL for initial JavaThread 1083 // (or for threads attached via JNI) 1084 oop threadObj() const; 1085 void set_threadObj(oop p); 1086 1087 // Prepare thread and add to priority queue. If a priority is 1088 // not specified, use the priority of the thread object. Threads_lock 1089 // must be held while this function is called. 1090 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 1091 1092 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 1093 address saved_exception_pc() { return _saved_exception_pc; } 1094 1095 ThreadFunction entry_point() const { return _entry_point; } 1096 1097 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1098 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS); 1099 1100 // Last frame anchor routines 1101 1102 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1103 1104 // last_Java_sp 1105 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1106 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1107 1108 // last_Java_pc 1109 1110 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1111 1112 // Safepoint support 1113 inline JavaThreadState thread_state() const; 1114 inline void set_thread_state(JavaThreadState s); 1115 inline void set_thread_state_fence(JavaThreadState s); // fence after setting thread state 1116 inline ThreadSafepointState* safepoint_state() const; 1117 inline void set_safepoint_state(ThreadSafepointState* state); 1118 inline bool is_at_poll_safepoint(); 1119 1120 // JavaThread termination and lifecycle support: 1121 void smr_delete(); 1122 bool on_thread_list() const { return _on_thread_list; } 1123 void set_on_thread_list() { _on_thread_list = true; } 1124 1125 // thread has called JavaThread::exit() or is terminated 1126 bool is_exiting() const; 1127 // thread is terminated (no longer on the threads list); we compare 1128 // against the two non-terminated values so that a freed JavaThread 1129 // will also be considered terminated. 1130 bool check_is_terminated(TerminatedTypes l_terminated) const { 1131 return l_terminated != _not_terminated && l_terminated != _thread_exiting; 1132 } 1133 bool is_terminated() const; 1134 void set_terminated(TerminatedTypes t); 1135 1136 void block_if_vm_exited(); 1137 1138 bool doing_unsafe_access() { return _doing_unsafe_access; } 1139 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1140 1141 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1142 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1143 1144 SafepointMechanism::ThreadData* poll_data() { return &_poll_data; } 1145 1146 void set_requires_cross_modify_fence(bool val) PRODUCT_RETURN NOT_PRODUCT({ _requires_cross_modify_fence = val; }) 1147 1148 private: 1149 DEBUG_ONLY(void verify_frame_info();) 1150 1151 // Support for thread handshake operations 1152 HandshakeState _handshake; 1153 public: 1154 HandshakeState* handshake_state() { return &_handshake; } 1155 1156 // A JavaThread can always safely operate on it self and other threads 1157 // can do it safely if they are the active handshaker. 1158 bool is_handshake_safe_for(Thread* th) const { 1159 return _handshake.active_handshaker() == th || this == th; 1160 } 1161 1162 // Suspend/resume support for JavaThread 1163 bool java_suspend(); // higher-level suspension logic called by the public APIs 1164 bool java_resume(); // higher-level resume logic called by the public APIs 1165 bool is_suspended() { return _handshake.is_suspended(); } 1166 1167 // Check for async exception in addition to safepoint. 1168 static void check_special_condition_for_native_trans(JavaThread *thread); 1169 1170 // Synchronize with another thread that is deoptimizing objects of the 1171 // current thread, i.e. reverts optimizations based on escape analysis. 1172 void wait_for_object_deoptimization(); 1173 1174 // these next two are also used for self-suspension and async exception support 1175 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1176 1177 // Return true if JavaThread has an asynchronous condition or 1178 // if external suspension is requested. 1179 bool has_special_runtime_exit_condition() { 1180 return (_suspend_flags & (_has_async_exception | _obj_deopt JFR_ONLY(| _trace_flag))) != 0; 1181 } 1182 1183 // Fast-locking support 1184 bool is_lock_owned(address adr) const; 1185 1186 // Accessors for vframe array top 1187 // The linked list of vframe arrays are sorted on sp. This means when we 1188 // unpack the head must contain the vframe array to unpack. 1189 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1190 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1191 1192 // Side structure for deferring update of java frame locals until deopt occurs 1193 JvmtiDeferredUpdates* deferred_updates() const { return _jvmti_deferred_updates; } 1194 void set_deferred_updates(JvmtiDeferredUpdates* du) { _jvmti_deferred_updates = du; } 1195 1196 // These only really exist to make debugging deopt problems simpler 1197 1198 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1199 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1200 1201 // The special resourceMark used during deoptimization 1202 1203 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1204 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1205 1206 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; } 1207 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; } 1208 1209 Method* callee_target() const { return _callee_target; } 1210 void set_callee_target (Method* x) { _callee_target = x; } 1211 1212 // Oop results of vm runtime calls 1213 oop vm_result() const { return _vm_result; } 1214 void set_vm_result (oop x) { _vm_result = x; } 1215 1216 Metadata* vm_result_2() const { return _vm_result_2; } 1217 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1218 1219 oop return_buffered_value() const { return _return_buffered_value; } 1220 void set_return_buffered_value(oop val) { _return_buffered_value = val; } 1221 1222 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1223 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1224 1225 #if INCLUDE_JVMCI 1226 int pending_deoptimization() const { return _pending_deoptimization; } 1227 jlong pending_failed_speculation() const { return _pending_failed_speculation; } 1228 bool has_pending_monitorenter() const { return _pending_monitorenter; } 1229 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } 1230 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } 1231 void set_pending_failed_speculation(jlong failed_speculation) { _pending_failed_speculation = failed_speculation; } 1232 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } 1233 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; } 1234 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; } 1235 1236 virtual bool in_retryable_allocation() const { return _in_retryable_allocation; } 1237 void set_in_retryable_allocation(bool b) { _in_retryable_allocation = b; } 1238 #endif // INCLUDE_JVMCI 1239 1240 // Exception handling for compiled methods 1241 oop exception_oop() const; 1242 address exception_pc() const { return _exception_pc; } 1243 address exception_handler_pc() const { return _exception_handler_pc; } 1244 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1245 1246 void set_exception_oop(oop o); 1247 void set_exception_pc(address a) { _exception_pc = a; } 1248 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1249 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1250 1251 void clear_exception_oop_and_pc() { 1252 set_exception_oop(NULL); 1253 set_exception_pc(NULL); 1254 } 1255 1256 // Check if address is in the usable part of the stack (excludes protected 1257 // guard pages). Can be applied to any thread and is an approximation for 1258 // using is_in_live_stack when the query has to happen from another thread. 1259 bool is_in_usable_stack(address adr) const { 1260 return is_in_stack_range_incl(adr, _stack_overflow_state.stack_reserved_zone_base()); 1261 } 1262 1263 // Misc. accessors/mutators 1264 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1265 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1266 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1267 1268 // For assembly stub generation 1269 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } 1270 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } 1271 static ByteSize pending_jni_exception_check_fn_offset() { 1272 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn); 1273 } 1274 static ByteSize last_Java_sp_offset() { 1275 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1276 } 1277 static ByteSize last_Java_pc_offset() { 1278 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1279 } 1280 static ByteSize frame_anchor_offset() { 1281 return byte_offset_of(JavaThread, _anchor); 1282 } 1283 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } 1284 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } 1285 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } 1286 static ByteSize return_buffered_value_offset() { return byte_offset_of(JavaThread, _return_buffered_value); } 1287 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } 1288 static ByteSize polling_word_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_word);} 1289 static ByteSize polling_page_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_page);} 1290 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } 1291 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } 1292 #if INCLUDE_JVMCI 1293 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); } 1294 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); } 1295 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); } 1296 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); } 1297 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); } 1298 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); } 1299 #endif // INCLUDE_JVMCI 1300 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } 1301 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } 1302 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1303 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1304 1305 static ByteSize active_handles_offset() { return byte_offset_of(JavaThread, _active_handles); } 1306 1307 // StackOverflow offsets 1308 static ByteSize stack_overflow_limit_offset() { 1309 return byte_offset_of(JavaThread, _stack_overflow_state._stack_overflow_limit); 1310 } 1311 static ByteSize stack_guard_state_offset() { 1312 return byte_offset_of(JavaThread, _stack_overflow_state._stack_guard_state); 1313 } 1314 static ByteSize reserved_stack_activation_offset() { 1315 return byte_offset_of(JavaThread, _stack_overflow_state._reserved_stack_activation); 1316 } 1317 static ByteSize shadow_zone_safe_limit() { 1318 return byte_offset_of(JavaThread, _stack_overflow_state._shadow_zone_safe_limit); 1319 } 1320 static ByteSize shadow_zone_growth_watermark() { 1321 return byte_offset_of(JavaThread, _stack_overflow_state._shadow_zone_growth_watermark); 1322 } 1323 1324 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } 1325 1326 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1327 static ByteSize should_post_on_exceptions_flag_offset() { 1328 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1329 } 1330 static ByteSize doing_unsafe_access_offset() { return byte_offset_of(JavaThread, _doing_unsafe_access); } 1331 NOT_PRODUCT(static ByteSize requires_cross_modify_fence_offset() { return byte_offset_of(JavaThread, _requires_cross_modify_fence); }) 1332 1333 // Returns the jni environment for this thread 1334 JNIEnv* jni_environment() { return &_jni_environment; } 1335 1336 // Returns the current thread as indicated by the given JNIEnv. 1337 // We don't assert it is Thread::current here as that is done at the 1338 // external JNI entry points where the JNIEnv is passed into the VM. 1339 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1340 JavaThread* current = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1341 // We can't normally get here in a thread that has completed its 1342 // execution and so "is_terminated", except when the call is from 1343 // AsyncGetCallTrace, which can be triggered by a signal at any point in 1344 // a thread's lifecycle. A thread is also considered terminated if the VM 1345 // has exited, so we have to check this and block in case this is a daemon 1346 // thread returning to the VM (the JNI DirectBuffer entry points rely on 1347 // this). 1348 if (current->is_terminated()) { 1349 current->block_if_vm_exited(); 1350 } 1351 return current; 1352 } 1353 1354 // JNI critical regions. These can nest. 1355 bool in_critical() { return _jni_active_critical > 0; } 1356 bool in_last_critical() { return _jni_active_critical == 1; } 1357 inline void enter_critical(); 1358 void exit_critical() { 1359 assert(Thread::current() == this, "this must be current thread"); 1360 _jni_active_critical--; 1361 assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); 1362 } 1363 1364 // Checked JNI: is the programmer required to check for exceptions, if so specify 1365 // which function name. Returning to a Java frame should implicitly clear the 1366 // pending check, this is done for Native->Java transitions (i.e. user JNI code). 1367 // VM->Java transistions are not cleared, it is expected that JNI code enclosed 1368 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal). 1369 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1370 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1371 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1372 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1373 1374 // For deadlock detection 1375 int depth_first_number() { return _depth_first_number; } 1376 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1377 1378 private: 1379 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1380 1381 public: 1382 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1383 void add_monitor_chunk(MonitorChunk* chunk); 1384 void remove_monitor_chunk(MonitorChunk* chunk); 1385 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1386 void inc_in_deopt_handler() { _in_deopt_handler++; } 1387 void dec_in_deopt_handler() { 1388 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1389 if (_in_deopt_handler > 0) { // robustness 1390 _in_deopt_handler--; 1391 } 1392 } 1393 1394 private: 1395 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1396 1397 // factor out low-level mechanics for use in both normal and error cases 1398 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1399 1400 public: 1401 1402 // Frame iteration; calls the function f for all frames on the stack 1403 void frames_do(void f(frame*, const RegisterMap*)); 1404 1405 // Memory operations 1406 void oops_do_frames(OopClosure* f, CodeBlobClosure* cf); 1407 void oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf); 1408 1409 // Sweeper operations 1410 virtual void nmethods_do(CodeBlobClosure* cf); 1411 1412 // RedefineClasses Support 1413 void metadata_do(MetadataClosure* f); 1414 1415 // Debug method asserting thread states are correct during a handshake operation. 1416 DEBUG_ONLY(void verify_states_for_handshake();) 1417 1418 // Misc. operations 1419 const char* name() const; 1420 const char* type_name() const { return "JavaThread"; } 1421 static const char* name_for(oop thread_obj); 1422 1423 void print_on(outputStream* st, bool print_extended_info) const; 1424 void print_on(outputStream* st) const { print_on(st, false); } 1425 void print() const; 1426 void print_thread_state_on(outputStream*) const PRODUCT_RETURN; 1427 void print_on_error(outputStream* st, char* buf, int buflen) const; 1428 void print_name_on_error(outputStream* st, char* buf, int buflen) const; 1429 void verify(); 1430 1431 // Accessing frames 1432 frame last_frame() { 1433 _anchor.make_walkable(this); 1434 return pd_last_frame(); 1435 } 1436 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1437 1438 // Returns method at 'depth' java or native frames down the stack 1439 // Used for security checks 1440 Klass* security_get_caller_class(int depth); 1441 1442 // Print stack trace in external format 1443 void print_stack_on(outputStream* st); 1444 void print_stack() { print_stack_on(tty); } 1445 1446 // Print stack traces in various internal formats 1447 void trace_stack() PRODUCT_RETURN; 1448 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1449 void trace_frames() PRODUCT_RETURN; 1450 1451 // Print an annotated view of the stack frames 1452 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1453 void validate_frame_layout() { 1454 print_frame_layout(0, true); 1455 } 1456 1457 // Function for testing deoptimization 1458 void deoptimize(); 1459 void make_zombies(); 1460 1461 void deoptimize_marked_methods(); 1462 1463 public: 1464 // Returns the running thread as a JavaThread 1465 static JavaThread* current() { 1466 return JavaThread::cast(Thread::current()); 1467 } 1468 1469 // Returns the current thread as a JavaThread, or NULL if not attached 1470 static inline JavaThread* current_or_null(); 1471 1472 // Casts 1473 static JavaThread* cast(Thread* t) { 1474 assert(t->is_Java_thread(), "incorrect cast to JavaThread"); 1475 return static_cast<JavaThread*>(t); 1476 } 1477 1478 static const JavaThread* cast(const Thread* t) { 1479 assert(t->is_Java_thread(), "incorrect cast to const JavaThread"); 1480 return static_cast<const JavaThread*>(t); 1481 } 1482 1483 // Returns the active Java thread. Do not use this if you know you are calling 1484 // from a JavaThread, as it's slower than JavaThread::current. If called from 1485 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1486 // operation. You may not want that either. 1487 static JavaThread* active(); 1488 1489 protected: 1490 virtual void pre_run(); 1491 virtual void run(); 1492 void thread_main_inner(); 1493 virtual void post_run(); 1494 1495 public: 1496 // Thread local information maintained by JVMTI. 1497 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1498 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1499 // getter is used to get this JavaThread's JvmtiThreadState if it has 1500 // one which means NULL can be returned. JvmtiThreadState::state_for() 1501 // is used to get the specified JavaThread's JvmtiThreadState if it has 1502 // one or it allocates a new JvmtiThreadState for the JavaThread and 1503 // returns it. JvmtiThreadState::state_for() will return NULL only if 1504 // the specified JavaThread is exiting. 1505 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1506 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1507 1508 // JVMTI PopFrame support 1509 // Setting and clearing popframe_condition 1510 // All of these enumerated values are bits. popframe_pending 1511 // indicates that a PopFrame() has been requested and not yet been 1512 // completed. popframe_processing indicates that that PopFrame() is in 1513 // the process of being completed. popframe_force_deopt_reexecution_bit 1514 // indicates that special handling is required when returning to a 1515 // deoptimized caller. 1516 enum PopCondition { 1517 popframe_inactive = 0x00, 1518 popframe_pending_bit = 0x01, 1519 popframe_processing_bit = 0x02, 1520 popframe_force_deopt_reexecution_bit = 0x04 1521 }; 1522 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1523 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1524 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1525 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1526 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1527 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1528 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1529 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1530 1531 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1532 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1533 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1534 1535 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1536 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1537 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1538 1539 private: 1540 // Saved incoming arguments to popped frame. 1541 // Used only when popped interpreted frame returns to deoptimized frame. 1542 void* _popframe_preserved_args; 1543 int _popframe_preserved_args_size; 1544 1545 public: 1546 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1547 void* popframe_preserved_args(); 1548 ByteSize popframe_preserved_args_size(); 1549 WordSize popframe_preserved_args_size_in_words(); 1550 void popframe_free_preserved_args(); 1551 1552 1553 private: 1554 JvmtiThreadState *_jvmti_thread_state; 1555 1556 // Used by the interpreter in fullspeed mode for frame pop, method 1557 // entry, method exit and single stepping support. This field is 1558 // only set to non-zero at a safepoint or using a direct handshake 1559 // (see EnterInterpOnlyModeClosure). 1560 // It can be set to zero asynchronously to this threads execution (i.e., without 1561 // safepoint/handshake or a lock) so we have to be very careful. 1562 // Accesses by other threads are synchronized using JvmtiThreadState_lock though. 1563 int _interp_only_mode; 1564 1565 public: 1566 // used by the interpreter for fullspeed debugging support (see above) 1567 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1568 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1569 int get_interp_only_mode() { return _interp_only_mode; } 1570 void increment_interp_only_mode() { ++_interp_only_mode; } 1571 void decrement_interp_only_mode() { --_interp_only_mode; } 1572 1573 // support for cached flag that indicates whether exceptions need to be posted for this thread 1574 // if this is false, we can avoid deoptimizing when events are thrown 1575 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1576 private: 1577 int _should_post_on_exceptions_flag; 1578 1579 public: 1580 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1581 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1582 1583 private: 1584 ThreadStatistics *_thread_stat; 1585 1586 public: 1587 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1588 1589 // Return a blocker object for which this thread is blocked parking. 1590 oop current_park_blocker(); 1591 1592 private: 1593 static size_t _stack_size_at_create; 1594 1595 public: 1596 static inline size_t stack_size_at_create(void) { 1597 return _stack_size_at_create; 1598 } 1599 static inline void set_stack_size_at_create(size_t value) { 1600 _stack_size_at_create = value; 1601 } 1602 1603 // Machine dependent stuff 1604 #include OS_CPU_HEADER(thread) 1605 1606 // JSR166 per-thread parker 1607 private: 1608 Parker _parker; 1609 public: 1610 Parker* parker() { return &_parker; } 1611 1612 public: 1613 // clearing/querying jni attach status 1614 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1615 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1616 inline void set_done_attaching_via_jni(); 1617 1618 // Stack dump assistance: 1619 // Track the class we want to initialize but for which we have to wait 1620 // on its init_lock() because it is already being initialized. 1621 void set_class_to_be_initialized(InstanceKlass* k); 1622 InstanceKlass* class_to_be_initialized() const; 1623 1624 private: 1625 InstanceKlass* _class_to_be_initialized; 1626 1627 // java.lang.Thread.sleep support 1628 ParkEvent * _SleepEvent; 1629 public: 1630 bool sleep(jlong millis); 1631 1632 // java.lang.Thread interruption support 1633 void interrupt(); 1634 bool is_interrupted(bool clear_interrupted); 1635 1636 static OopStorage* thread_oop_storage(); 1637 1638 static void verify_cross_modify_fence_failure(JavaThread *thread) PRODUCT_RETURN; 1639 1640 // Helper function to create the java.lang.Thread object for a 1641 // VM-internal thread. The thread will have the given name, be 1642 // part of the System ThreadGroup and if is_visible is true will be 1643 // discoverable via the system ThreadGroup. 1644 static Handle create_system_thread_object(const char* name, bool is_visible, TRAPS); 1645 1646 // Helper function to start a VM-internal daemon thread. 1647 // E.g. ServiceThread, NotificationThread, CompilerThread etc. 1648 static void start_internal_daemon(JavaThread* current, JavaThread* target, 1649 Handle thread_oop, ThreadPriority prio); 1650 1651 // Helper function to do vm_exit_on_initialization for osthread 1652 // resource allocation failure. 1653 static void vm_exit_on_osthread_failure(JavaThread* thread); 1654 }; 1655 1656 inline JavaThread* JavaThread::current_or_null() { 1657 Thread* current = Thread::current_or_null(); 1658 return current != nullptr ? JavaThread::cast(current) : nullptr; 1659 } 1660 1661 // The active thread queue. It also keeps track of the current used 1662 // thread priorities. 1663 class Threads: AllStatic { 1664 friend class VMStructs; 1665 private: 1666 static int _number_of_threads; 1667 static int _number_of_non_daemon_threads; 1668 static int _return_code; 1669 static uintx _thread_claim_token; 1670 #ifdef ASSERT 1671 static bool _vm_complete; 1672 #endif 1673 1674 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS); 1675 static void initialize_jsr292_core_classes(TRAPS); 1676 1677 public: 1678 // Thread management 1679 // force_daemon is a concession to JNI, where we may need to add a 1680 // thread to the thread list before allocating its thread object 1681 static void add(JavaThread* p, bool force_daemon = false); 1682 static void remove(JavaThread* p, bool is_daemon); 1683 static void non_java_threads_do(ThreadClosure* tc); 1684 static void java_threads_do(ThreadClosure* tc); 1685 static void java_threads_and_vm_thread_do(ThreadClosure* tc); 1686 static void threads_do(ThreadClosure* tc); 1687 static void possibly_parallel_threads_do(bool is_par, ThreadClosure* tc); 1688 1689 // Initializes the vm and creates the vm thread 1690 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 1691 static void convert_vm_init_libraries_to_agents(); 1692 static void create_vm_init_libraries(); 1693 static void create_vm_init_agents(); 1694 static void shutdown_vm_agents(); 1695 static void destroy_vm(); 1696 // Supported VM versions via JNI 1697 // Includes JNI_VERSION_1_1 1698 static jboolean is_supported_jni_version_including_1_1(jint version); 1699 // Does not include JNI_VERSION_1_1 1700 static jboolean is_supported_jni_version(jint version); 1701 1702 // The "thread claim token" provides a way for threads to be claimed 1703 // by parallel worker tasks. 1704 // 1705 // Each thread contains a "token" field. A task will claim the 1706 // thread only if its token is different from the global token, 1707 // which is updated by calling change_thread_claim_token(). When 1708 // a thread is claimed, it's token is set to the global token value 1709 // so other threads in the same iteration pass won't claim it. 1710 // 1711 // For this to work change_thread_claim_token() needs to be called 1712 // exactly once in sequential code before starting parallel tasks 1713 // that should claim threads. 1714 // 1715 // New threads get their token set to 0 and change_thread_claim_token() 1716 // never sets the global token to 0. 1717 static uintx thread_claim_token() { return _thread_claim_token; } 1718 static void change_thread_claim_token(); 1719 static void assert_all_threads_claimed() NOT_DEBUG_RETURN; 1720 1721 // Apply "f->do_oop" to all root oops in all threads. 1722 // This version may only be called by sequential code. 1723 static void oops_do(OopClosure* f, CodeBlobClosure* cf); 1724 // This version may be called by sequential or parallel code. 1725 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf); 1726 1727 // RedefineClasses support 1728 static void metadata_do(MetadataClosure* f); 1729 static void metadata_handles_do(void f(Metadata*)); 1730 1731 #ifdef ASSERT 1732 static bool is_vm_complete() { return _vm_complete; } 1733 #endif // ASSERT 1734 1735 // Verification 1736 static void verify(); 1737 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks, bool print_extended_info); 1738 static void print(bool print_stacks, bool internal_format) { 1739 // this function is only used by debug.cpp 1740 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */, false /* simple format */); 1741 } 1742 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 1743 static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf, 1744 int buflen, bool* found_current); 1745 static void print_threads_compiling(outputStream* st, char* buf, int buflen, bool short_form = false); 1746 1747 // Get Java threads that are waiting to enter a monitor. 1748 static GrowableArray<JavaThread*>* get_pending_threads(ThreadsList * t_list, 1749 int count, address monitor); 1750 1751 // Get owning Java thread from the monitor's owner field. 1752 static JavaThread *owning_thread_from_monitor_owner(ThreadsList * t_list, 1753 address owner); 1754 1755 // Number of threads on the active threads list 1756 static int number_of_threads() { return _number_of_threads; } 1757 // Number of non-daemon threads on the active threads list 1758 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 1759 1760 // Deoptimizes all frames tied to marked nmethods 1761 static void deoptimized_wrt_marked_nmethods(); 1762 1763 struct Test; // For private gtest access. 1764 }; 1765 1766 class UnlockFlagSaver { 1767 private: 1768 JavaThread* _thread; 1769 bool _do_not_unlock; 1770 public: 1771 UnlockFlagSaver(JavaThread* t) { 1772 _thread = t; 1773 _do_not_unlock = t->do_not_unlock_if_synchronized(); 1774 t->set_do_not_unlock_if_synchronized(false); 1775 } 1776 ~UnlockFlagSaver() { 1777 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock); 1778 } 1779 }; 1780 1781 class JNIHandleMark : public StackObj { 1782 JavaThread* _thread; 1783 public: 1784 JNIHandleMark(JavaThread* thread) : _thread(thread) { 1785 thread->push_jni_handle_block(); 1786 } 1787 ~JNIHandleMark() { _thread->pop_jni_handle_block(); } 1788 }; 1789 1790 #endif // SHARE_RUNTIME_THREAD_HPP