1 /* 2 * Copyright (c) 1997, 2021, 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 58 class SafeThreadsListPtr; 59 class ThreadSafepointState; 60 class ThreadsList; 61 class ThreadsSMRSupport; 62 63 class JNIHandleBlock; 64 class JvmtiRawMonitor; 65 class JvmtiSampledObjectAllocEventCollector; 66 class JvmtiThreadState; 67 class JvmtiVMObjectAllocEventCollector; 68 class OSThread; 69 class ThreadStatistics; 70 class ConcurrentLocksDump; 71 class MonitorInfo; 72 73 class vframeArray; 74 class vframe; 75 class javaVFrame; 76 77 class DeoptResourceMark; 78 class JvmtiDeferredUpdates; 79 80 class ThreadClosure; 81 class ICRefillVerifier; 82 83 class Metadata; 84 class ResourceArea; 85 86 class OopStorage; 87 88 DEBUG_ONLY(class ResourceMark;) 89 90 class WorkerThread; 91 92 class JavaThread; 93 94 // Class hierarchy 95 // - Thread 96 // - JavaThread 97 // - various subclasses eg CompilerThread, ServiceThread 98 // - NonJavaThread 99 // - NamedThread 100 // - VMThread 101 // - ConcurrentGCThread 102 // - WorkerThread 103 // - GangWorker 104 // - WatcherThread 105 // - JfrThreadSampler 106 // - LogAsyncWriter 107 // 108 // All Thread subclasses must be either JavaThread or NonJavaThread. 109 // This means !t->is_Java_thread() iff t is a NonJavaThread, or t is 110 // a partially constructed/destroyed Thread. 111 112 // Thread execution sequence and actions: 113 // All threads: 114 // - thread_native_entry // per-OS native entry point 115 // - stack initialization 116 // - other OS-level initialization (signal masks etc) 117 // - handshake with creating thread (if not started suspended) 118 // - this->call_run() // common shared entry point 119 // - shared common initialization 120 // - this->pre_run() // virtual per-thread-type initialization 121 // - this->run() // virtual per-thread-type "main" logic 122 // - shared common tear-down 123 // - this->post_run() // virtual per-thread-type tear-down 124 // - // 'this' no longer referenceable 125 // - OS-level tear-down (minimal) 126 // - final logging 127 // 128 // For JavaThread: 129 // - this->run() // virtual but not normally overridden 130 // - this->thread_main_inner() // extra call level to ensure correct stack calculations 131 // - this->entry_point() // set differently for each kind of JavaThread 132 133 class Thread: public ThreadShadow { 134 friend class VMStructs; 135 friend class JVMCIVMStructs; 136 private: 137 138 #ifndef USE_LIBRARY_BASED_TLS_ONLY 139 // Current thread is maintained as a thread-local variable 140 static THREAD_LOCAL Thread* _thr_current; 141 #endif 142 143 // Thread local data area available to the GC. The internal 144 // structure and contents of this data area is GC-specific. 145 // Only GC and GC barrier code should access this data area. 146 GCThreadLocalData _gc_data; 147 148 public: 149 static ByteSize gc_data_offset() { 150 return byte_offset_of(Thread, _gc_data); 151 } 152 153 template <typename T> T* gc_data() { 154 STATIC_ASSERT(sizeof(T) <= sizeof(_gc_data)); 155 return reinterpret_cast<T*>(&_gc_data); 156 } 157 158 // Exception handling 159 // (Note: _pending_exception and friends are in ThreadShadow) 160 //oop _pending_exception; // pending exception for current thread 161 // const char* _exception_file; // file information for exception (debugging only) 162 // int _exception_line; // line information for exception (debugging only) 163 protected: 164 165 DEBUG_ONLY(static Thread* _starting_thread;) 166 167 // Support for forcing alignment of thread objects for biased locking 168 void* _real_malloc_address; 169 170 // JavaThread lifecycle support: 171 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 172 friend class ScanHazardPtrGatherProtectedThreadsClosure; // for cmpxchg_threads_hazard_ptr(), get_threads_hazard_ptr(), is_hazard_ptr_tagged() access 173 friend class ScanHazardPtrGatherThreadsListClosure; // for get_threads_hazard_ptr(), untag_hazard_ptr() access 174 friend class ScanHazardPtrPrintMatchingThreadsClosure; // for get_threads_hazard_ptr(), is_hazard_ptr_tagged() access 175 friend class ThreadsSMRSupport; // for _nested_threads_hazard_ptr_cnt, _threads_hazard_ptr, _threads_list_ptr access 176 friend class ThreadsListHandleTest; // for _nested_threads_hazard_ptr_cnt, _threads_hazard_ptr, _threads_list_ptr access 177 friend class ValidateHazardPtrsClosure; // for get_threads_hazard_ptr(), untag_hazard_ptr() access 178 179 ThreadsList* volatile _threads_hazard_ptr; 180 SafeThreadsListPtr* _threads_list_ptr; 181 ThreadsList* cmpxchg_threads_hazard_ptr(ThreadsList* exchange_value, ThreadsList* compare_value); 182 ThreadsList* get_threads_hazard_ptr() const; 183 void set_threads_hazard_ptr(ThreadsList* new_list); 184 static bool is_hazard_ptr_tagged(ThreadsList* list) { 185 return (intptr_t(list) & intptr_t(1)) == intptr_t(1); 186 } 187 static ThreadsList* tag_hazard_ptr(ThreadsList* list) { 188 return (ThreadsList*)(intptr_t(list) | intptr_t(1)); 189 } 190 static ThreadsList* untag_hazard_ptr(ThreadsList* list) { 191 return (ThreadsList*)(intptr_t(list) & ~intptr_t(1)); 192 } 193 // This field is enabled via -XX:+EnableThreadSMRStatistics: 194 uint _nested_threads_hazard_ptr_cnt; 195 void dec_nested_threads_hazard_ptr_cnt() { 196 assert(_nested_threads_hazard_ptr_cnt != 0, "mismatched {dec,inc}_nested_threads_hazard_ptr_cnt()"); 197 _nested_threads_hazard_ptr_cnt--; 198 } 199 void inc_nested_threads_hazard_ptr_cnt() { 200 _nested_threads_hazard_ptr_cnt++; 201 } 202 uint nested_threads_hazard_ptr_cnt() { 203 return _nested_threads_hazard_ptr_cnt; 204 } 205 206 public: 207 // Is the target JavaThread protected by the calling Thread 208 // or by some other mechanism: 209 static bool is_JavaThread_protected(const JavaThread* p); 210 211 void* operator new(size_t size) throw() { return allocate(size, true); } 212 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 213 return allocate(size, false); } 214 void operator delete(void* p); 215 216 protected: 217 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 218 219 private: 220 DEBUG_ONLY(bool _suspendible_thread;) 221 222 public: 223 // Determines if a heap allocation failure will be retried 224 // (e.g., by deoptimizing and re-executing in the interpreter). 225 // In this case, the failed allocation must raise 226 // Universe::out_of_memory_error_retry() and omit side effects 227 // such as JVMTI events and handling -XX:+HeapDumpOnOutOfMemoryError 228 // and -XX:OnOutOfMemoryError. 229 virtual bool in_retryable_allocation() const { return false; } 230 231 #ifdef ASSERT 232 void set_suspendible_thread() { 233 _suspendible_thread = true; 234 } 235 236 void clear_suspendible_thread() { 237 _suspendible_thread = false; 238 } 239 240 bool is_suspendible_thread() { return _suspendible_thread; } 241 #endif 242 243 private: 244 // Active_handles points to a block of handles 245 JNIHandleBlock* _active_handles; 246 247 // One-element thread local free list 248 JNIHandleBlock* _free_handle_block; 249 250 // Point to the last handle mark 251 HandleMark* _last_handle_mark; 252 253 // Claim value for parallel iteration over threads. 254 uintx _threads_do_token; 255 256 // Support for GlobalCounter 257 private: 258 volatile uintx _rcu_counter; 259 public: 260 volatile uintx* get_rcu_counter() { 261 return &_rcu_counter; 262 } 263 264 public: 265 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 266 HandleMark* last_handle_mark() const { return _last_handle_mark; } 267 private: 268 269 #ifdef ASSERT 270 ICRefillVerifier* _missed_ic_stub_refill_verifier; 271 272 public: 273 ICRefillVerifier* missed_ic_stub_refill_verifier() { 274 return _missed_ic_stub_refill_verifier; 275 } 276 277 void set_missed_ic_stub_refill_verifier(ICRefillVerifier* verifier) { 278 _missed_ic_stub_refill_verifier = verifier; 279 } 280 #endif // ASSERT 281 282 private: 283 // Used by SkipGCALot class. 284 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 285 286 friend class GCLocker; 287 288 private: 289 ThreadLocalAllocBuffer _tlab; // Thread-local eden 290 jlong _allocated_bytes; // Cumulative number of bytes allocated on 291 // the Java heap 292 ThreadHeapSampler _heap_sampler; // For use when sampling the memory. 293 294 ThreadStatisticalInfo _statistical_info; // Statistics about the thread 295 296 JFR_ONLY(DEFINE_THREAD_LOCAL_FIELD_JFR;) // Thread-local data for jfr 297 298 JvmtiRawMonitor* _current_pending_raw_monitor; // JvmtiRawMonitor this thread 299 // is waiting to lock 300 public: 301 // Constructor 302 Thread(); 303 virtual ~Thread() = 0; // Thread is abstract. 304 305 // Manage Thread::current() 306 void initialize_thread_current(); 307 static void clear_thread_current(); // TLS cleanup needed before threads terminate 308 309 protected: 310 // To be implemented by children. 311 virtual void run() = 0; 312 virtual void pre_run() = 0; 313 virtual void post_run() = 0; // Note: Thread must not be deleted prior to calling this! 314 315 #ifdef ASSERT 316 enum RunState { 317 PRE_CALL_RUN, 318 CALL_RUN, 319 PRE_RUN, 320 RUN, 321 POST_RUN 322 // POST_CALL_RUN - can't define this one as 'this' may be deleted when we want to set it 323 }; 324 RunState _run_state; // for lifecycle checks 325 #endif 326 327 328 public: 329 // invokes <ChildThreadClass>::run(), with common preparations and cleanups. 330 void call_run(); 331 332 // Testers 333 virtual bool is_VM_thread() const { return false; } 334 virtual bool is_Java_thread() const { return false; } 335 virtual bool is_Compiler_thread() const { return false; } 336 virtual bool is_Code_cache_sweeper_thread() const { return false; } 337 virtual bool is_service_thread() const { return false; } 338 virtual bool is_monitor_deflation_thread() const { return false; } 339 virtual bool is_hidden_from_external_view() const { return false; } 340 virtual bool is_jvmti_agent_thread() const { return false; } 341 // True iff the thread can perform GC operations at a safepoint. 342 // Generally will be true only of VM thread and parallel GC WorkGang 343 // threads. 344 virtual bool is_GC_task_thread() const { return false; } 345 virtual bool is_Watcher_thread() const { return false; } 346 virtual bool is_ConcurrentGC_thread() const { return false; } 347 virtual bool is_Named_thread() const { return false; } 348 virtual bool is_Worker_thread() const { return false; } 349 virtual bool is_JfrSampler_thread() const { return false; } 350 351 // Can this thread make Java upcalls 352 virtual bool can_call_java() const { return false; } 353 354 // Is this a JavaThread that is on the VM's current ThreadsList? 355 // If so it must participate in the safepoint protocol. 356 virtual bool is_active_Java_thread() const { return false; } 357 358 // Casts 359 inline JavaThread* as_Java_thread(); 360 inline const JavaThread* as_Java_thread() const; 361 362 virtual char* name() const { return (char*)"Unknown thread"; } 363 364 // Returns the current thread (ASSERTS if NULL) 365 static inline Thread* current(); 366 // Returns the current thread, or NULL if not attached 367 static inline Thread* current_or_null(); 368 // Returns the current thread, or NULL if not attached, and is 369 // safe for use from signal-handlers 370 static inline Thread* current_or_null_safe(); 371 372 // Common thread operations 373 #ifdef ASSERT 374 static void check_for_dangling_thread_pointer(Thread *thread); 375 #endif 376 static void set_priority(Thread* thread, ThreadPriority priority); 377 static ThreadPriority get_priority(const Thread* const thread); 378 static void start(Thread* thread); 379 380 void set_native_thread_name(const char *name) { 381 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); 382 os::set_native_thread_name(name); 383 } 384 385 // Support for Unhandled Oop detection 386 // Add the field for both, fastdebug and debug, builds to keep 387 // Thread's fields layout the same. 388 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build. 389 #ifdef CHECK_UNHANDLED_OOPS 390 private: 391 UnhandledOops* _unhandled_oops; 392 #elif defined(ASSERT) 393 private: 394 void* _unhandled_oops; 395 #endif 396 #ifdef CHECK_UNHANDLED_OOPS 397 public: 398 UnhandledOops* unhandled_oops() { return _unhandled_oops; } 399 // Mark oop safe for gc. It may be stack allocated but won't move. 400 void allow_unhandled_oop(oop *op) { 401 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); 402 } 403 // Clear oops at safepoint so crashes point to unhandled oop violator 404 void clear_unhandled_oops() { 405 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); 406 } 407 #endif // CHECK_UNHANDLED_OOPS 408 409 public: 410 #ifndef PRODUCT 411 bool skip_gcalot() { return _skip_gcalot; } 412 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 413 #endif 414 415 // Resource area 416 ResourceArea* resource_area() const { return _resource_area; } 417 void set_resource_area(ResourceArea* area) { _resource_area = area; } 418 419 OSThread* osthread() const { return _osthread; } 420 void set_osthread(OSThread* thread) { _osthread = thread; } 421 422 // JNI handle support 423 JNIHandleBlock* active_handles() const { return _active_handles; } 424 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 425 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 426 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 427 428 // Internal handle support 429 HandleArea* handle_area() const { return _handle_area; } 430 void set_handle_area(HandleArea* area) { _handle_area = area; } 431 432 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 433 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 434 435 // Thread-Local Allocation Buffer (TLAB) support 436 ThreadLocalAllocBuffer& tlab() { return _tlab; } 437 void initialize_tlab(); 438 439 jlong allocated_bytes() { return _allocated_bytes; } 440 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 441 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 442 inline jlong cooked_allocated_bytes(); 443 444 ThreadHeapSampler& heap_sampler() { return _heap_sampler; } 445 446 ThreadStatisticalInfo& statistical_info() { return _statistical_info; } 447 448 JFR_ONLY(DEFINE_THREAD_LOCAL_ACCESSOR_JFR;) 449 450 // For tracking the Jvmti raw monitor the thread is pending on. 451 JvmtiRawMonitor* current_pending_raw_monitor() { 452 return _current_pending_raw_monitor; 453 } 454 void set_current_pending_raw_monitor(JvmtiRawMonitor* monitor) { 455 _current_pending_raw_monitor = monitor; 456 } 457 458 // GC support 459 // Apply "f->do_oop" to all root oops in "this". 460 // Used by JavaThread::oops_do. 461 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 462 virtual void oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf); 463 virtual void oops_do_frames(OopClosure* f, CodeBlobClosure* cf) {} 464 void oops_do(OopClosure* f, CodeBlobClosure* cf); 465 466 // Handles the parallel case for claim_threads_do. 467 private: 468 bool claim_par_threads_do(uintx claim_token); 469 public: 470 // Requires that "claim_token" is that of the current iteration. 471 // If "is_par" is false, sets the token of "this" to 472 // "claim_token", and returns "true". If "is_par" is true, 473 // uses an atomic instruction to set the current thread's token to 474 // "claim_token", if it is not already. Returns "true" iff the 475 // calling thread does the update, this indicates that the calling thread 476 // has claimed the thread in the current iteration. 477 bool claim_threads_do(bool is_par, uintx claim_token) { 478 if (!is_par) { 479 _threads_do_token = claim_token; 480 return true; 481 } else { 482 return claim_par_threads_do(claim_token); 483 } 484 } 485 486 uintx threads_do_token() const { return _threads_do_token; } 487 488 // jvmtiRedefineClasses support 489 void metadata_handles_do(void f(Metadata*)); 490 491 private: 492 // Check if address is within the given range of this thread's 493 // stack: stack_base() > adr >/>= limit 494 // The check is inclusive of limit if passed true, else exclusive. 495 bool is_in_stack_range(address adr, address limit, bool inclusive) const { 496 assert(stack_base() > limit && limit >= stack_end(), "limit is outside of stack"); 497 return stack_base() > adr && (inclusive ? adr >= limit : adr > limit); 498 } 499 500 public: 501 // Used by fast lock support 502 virtual bool is_lock_owned(address adr) const; 503 504 // Check if address is within the given range of this thread's 505 // stack: stack_base() > adr >= limit 506 bool is_in_stack_range_incl(address adr, address limit) const { 507 return is_in_stack_range(adr, limit, true); 508 } 509 510 // Check if address is within the given range of this thread's 511 // stack: stack_base() > adr > limit 512 bool is_in_stack_range_excl(address adr, address limit) const { 513 return is_in_stack_range(adr, limit, false); 514 } 515 516 // Check if address is in the stack mapped to this thread. Used mainly in 517 // error reporting (so has to include guard zone) and frame printing. 518 // Expects _stack_base to be initialized - checked with assert. 519 bool is_in_full_stack_checked(address adr) const { 520 return is_in_stack_range_incl(adr, stack_end()); 521 } 522 523 // Like is_in_full_stack_checked but without the assertions as this 524 // may be called in a thread before _stack_base is initialized. 525 bool is_in_full_stack(address adr) const { 526 address stack_end = _stack_base - _stack_size; 527 return _stack_base > adr && adr >= stack_end; 528 } 529 530 // Check if address is in the live stack of this thread (not just for locks). 531 // Warning: can only be called by the current thread on itself. 532 bool is_in_live_stack(address adr) const { 533 assert(Thread::current() == this, "is_in_live_stack can only be called from current thread"); 534 return is_in_stack_range_incl(adr, os::current_stack_pointer()); 535 } 536 537 // Sets this thread as starting thread. Returns failure if thread 538 // creation fails due to lack of memory, too many threads etc. 539 bool set_as_starting_thread(); 540 541 protected: 542 // OS data associated with the thread 543 OSThread* _osthread; // Platform-specific thread information 544 545 // Thread local resource area for temporary allocation within the VM 546 ResourceArea* _resource_area; 547 548 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 549 550 // Thread local handle area for allocation of handles within the VM 551 HandleArea* _handle_area; 552 GrowableArray<Metadata*>* _metadata_handles; 553 554 // Support for stack overflow handling, get_thread, etc. 555 address _stack_base; 556 size_t _stack_size; 557 int _lgrp_id; 558 559 public: 560 // Stack overflow support 561 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 562 void set_stack_base(address base) { _stack_base = base; } 563 size_t stack_size() const { return _stack_size; } 564 void set_stack_size(size_t size) { _stack_size = size; } 565 address stack_end() const { return stack_base() - stack_size(); } 566 void record_stack_base_and_size(); 567 void register_thread_stack_with_NMT() NOT_NMT_RETURN; 568 void unregister_thread_stack_with_NMT() NOT_NMT_RETURN; 569 570 int lgrp_id() const { return _lgrp_id; } 571 void set_lgrp_id(int value) { _lgrp_id = value; } 572 573 // Printing 574 void print_on(outputStream* st, bool print_extended_info) const; 575 virtual void print_on(outputStream* st) const { print_on(st, false); } 576 void print() const; 577 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 578 void print_value_on(outputStream* st) const; 579 580 // Debug-only code 581 #ifdef ASSERT 582 private: 583 // Deadlock detection support for Mutex locks. List of locks own by thread. 584 Mutex* _owned_locks; 585 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 586 // thus the friendship 587 friend class Mutex; 588 friend class Monitor; 589 590 public: 591 void print_owned_locks_on(outputStream* st) const; 592 void print_owned_locks() const { print_owned_locks_on(tty); } 593 Mutex* owned_locks() const { return _owned_locks; } 594 bool owns_locks() const { return owned_locks() != NULL; } 595 596 // Deadlock detection 597 ResourceMark* current_resource_mark() { return _current_resource_mark; } 598 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 599 #endif // ASSERT 600 601 private: 602 volatile int _jvmti_env_iteration_count; 603 604 public: 605 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 606 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 607 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 608 609 // Code generation 610 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); } 611 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); } 612 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); } 613 614 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); } 615 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); } 616 617 static ByteSize tlab_start_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::start_offset(); } 618 static ByteSize tlab_end_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::end_offset(); } 619 static ByteSize tlab_top_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::top_offset(); } 620 static ByteSize tlab_pf_top_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::pf_top_offset(); } 621 622 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); } 623 624 JFR_ONLY(DEFINE_THREAD_LOCAL_OFFSET_JFR;) 625 626 public: 627 ParkEvent * volatile _ParkEvent; // for Object monitors, JVMTI raw monitors, 628 // and ObjectSynchronizer::read_stable_mark 629 630 // Termination indicator used by the signal handler. 631 // _ParkEvent is just a convenient field we can NULL out after setting the JavaThread termination state 632 // (which can't itself be read from the signal handler if a signal hits during the Thread destructor). 633 bool has_terminated() { return Atomic::load(&_ParkEvent) == NULL; }; 634 635 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG 636 jint _hashStateX; // thread-specific hashCode generator state 637 jint _hashStateY; 638 jint _hashStateZ; 639 640 // Low-level leaf-lock primitives used to implement synchronization. 641 // Not for general synchronization use. 642 static void SpinAcquire(volatile int * Lock, const char * Name); 643 static void SpinRelease(volatile int * Lock); 644 645 #if defined(__APPLE__) && defined(AARCH64) 646 private: 647 DEBUG_ONLY(bool _wx_init); 648 WXMode _wx_state; 649 public: 650 void init_wx(); 651 WXMode enable_wx(WXMode new_state); 652 653 void assert_wx_state(WXMode expected) { 654 assert(_wx_state == expected, "wrong state"); 655 } 656 #endif // __APPLE__ && AARCH64 657 }; 658 659 // Inline implementation of Thread::current() 660 inline Thread* Thread::current() { 661 Thread* current = current_or_null(); 662 assert(current != NULL, "Thread::current() called on detached thread"); 663 return current; 664 } 665 666 inline Thread* Thread::current_or_null() { 667 #ifndef USE_LIBRARY_BASED_TLS_ONLY 668 return _thr_current; 669 #else 670 if (ThreadLocalStorage::is_initialized()) { 671 return ThreadLocalStorage::thread(); 672 } 673 return NULL; 674 #endif 675 } 676 677 inline Thread* Thread::current_or_null_safe() { 678 if (ThreadLocalStorage::is_initialized()) { 679 return ThreadLocalStorage::thread(); 680 } 681 return NULL; 682 } 683 684 class CompilerThread; 685 686 typedef void (*ThreadFunction)(JavaThread*, TRAPS); 687 688 class JavaThread: public Thread { 689 friend class VMStructs; 690 friend class JVMCIVMStructs; 691 friend class WhiteBox; 692 friend class ThreadsSMRSupport; // to access _threadObj for exiting_threads_oops_do 693 friend class HandshakeState; 694 private: 695 bool _in_asgct; // Is set when this JavaThread is handling ASGCT call 696 bool _on_thread_list; // Is set when this JavaThread is added to the Threads list 697 OopHandle _threadObj; // The Java level thread object 698 699 #ifdef ASSERT 700 private: 701 int _java_call_counter; 702 703 public: 704 int java_call_counter() { return _java_call_counter; } 705 void inc_java_call_counter() { _java_call_counter++; } 706 void dec_java_call_counter() { 707 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 708 _java_call_counter--; 709 } 710 private: // restore original namespace restriction 711 #endif // ifdef ASSERT 712 713 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 714 715 ThreadFunction _entry_point; 716 717 JNIEnv _jni_environment; 718 719 // Deopt support 720 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 721 722 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized 723 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 724 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 725 // Holds updates by JVMTI agents for compiled frames that cannot be performed immediately. They 726 // will be carried out as soon as possible which, in most cases, is just before deoptimization of 727 // the frame, when control returns to it. 728 JvmtiDeferredUpdates* _jvmti_deferred_updates; 729 730 // Handshake value for fixing 6243940. We need a place for the i2c 731 // adapter to store the callee Method*. This value is NEVER live 732 // across a gc point so it does NOT have to be gc'd 733 // The handshake is open ended since we can't be certain that it will 734 // be NULLed. This is because we rarely ever see the race and end up 735 // in handle_wrong_method which is the backend of the handshake. See 736 // code in i2c adapters and handle_wrong_method. 737 738 Method* _callee_target; 739 740 // Used to pass back results to the interpreter or generated code running Java code. 741 oop _vm_result; // oop result is GC-preserved 742 Metadata* _vm_result_2; // non-oop result 743 744 // See ReduceInitialCardMarks: this holds the precise space interval of 745 // the most recent slow path allocation for which compiled code has 746 // elided card-marks for performance along the fast-path. 747 MemRegion _deferred_card_mark; 748 749 ObjectMonitor* volatile _current_pending_monitor; // ObjectMonitor this thread is waiting to lock 750 bool _current_pending_monitor_is_from_java; // locking is from Java code 751 ObjectMonitor* volatile _current_waiting_monitor; // ObjectMonitor on which this thread called Object.wait() 752 public: 753 volatile intptr_t _Stalled; 754 755 // For tracking the heavyweight monitor the thread is pending on. 756 ObjectMonitor* current_pending_monitor() { 757 // Use Atomic::load() to prevent data race between concurrent modification and 758 // concurrent readers, e.g. ThreadService::get_current_contended_monitor(). 759 // Especially, reloading pointer from thread after NULL check must be prevented. 760 return Atomic::load(&_current_pending_monitor); 761 } 762 void set_current_pending_monitor(ObjectMonitor* monitor) { 763 Atomic::store(&_current_pending_monitor, monitor); 764 } 765 void set_current_pending_monitor_is_from_java(bool from_java) { 766 _current_pending_monitor_is_from_java = from_java; 767 } 768 bool current_pending_monitor_is_from_java() { 769 return _current_pending_monitor_is_from_java; 770 } 771 ObjectMonitor* current_waiting_monitor() { 772 // See the comment in current_pending_monitor() above. 773 return Atomic::load(&_current_waiting_monitor); 774 } 775 void set_current_waiting_monitor(ObjectMonitor* monitor) { 776 Atomic::store(&_current_waiting_monitor, monitor); 777 } 778 779 private: 780 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 781 // allocated during deoptimization 782 // and by JNI_MonitorEnter/Exit 783 784 enum SuspendFlags { 785 // NOTE: avoid using the sign-bit as cc generates different test code 786 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 787 _has_async_exception = 0x00000001U, // there is a pending async exception 788 _trace_flag = 0x00000004U, // call tracing backend 789 _obj_deopt = 0x00000008U // suspend for object reallocation and relocking for JVMTI agent 790 }; 791 792 // various suspension related flags - atomically updated 793 // overloaded with async exceptions so that we do a single check when transitioning from native->Java 794 volatile uint32_t _suspend_flags; 795 796 inline void set_suspend_flag(SuspendFlags f); 797 inline void clear_suspend_flag(SuspendFlags f); 798 799 public: 800 inline void set_trace_flag(); 801 inline void clear_trace_flag(); 802 inline void set_obj_deopt_flag(); 803 inline void clear_obj_deopt_flag(); 804 bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; } 805 bool is_obj_deopt_suspend() { return (_suspend_flags & _obj_deopt) != 0; } 806 807 // Asynchronous exceptions support 808 private: 809 enum AsyncExceptionCondition { 810 _no_async_condition = 0, 811 _async_exception, 812 _async_unsafe_access_error 813 }; 814 AsyncExceptionCondition _async_exception_condition; 815 oop _pending_async_exception; 816 817 void set_async_exception_condition(AsyncExceptionCondition aec) { _async_exception_condition = aec; } 818 AsyncExceptionCondition clear_async_exception_condition() { 819 AsyncExceptionCondition x = _async_exception_condition; 820 _async_exception_condition = _no_async_condition; 821 return x; 822 } 823 824 public: 825 bool has_async_exception_condition(bool check_unsafe_access_error = true) { 826 return check_unsafe_access_error ? _async_exception_condition != _no_async_condition 827 : _async_exception_condition == _async_exception; 828 } 829 inline void set_pending_async_exception(oop e); 830 void set_pending_unsafe_access_error() { 831 // Don't overwrite an asynchronous exception sent by another thread 832 if (_async_exception_condition == _no_async_condition) { 833 set_async_exception_condition(_async_unsafe_access_error); 834 } 835 } 836 void check_and_handle_async_exceptions(); 837 // Installs a pending exception to be inserted later 838 static void send_async_exception(oop thread_oop, oop java_throwable); 839 void send_thread_stop(oop throwable); 840 841 // Safepoint support 842 public: // Expose _thread_state for SafeFetchInt() 843 volatile JavaThreadState _thread_state; 844 private: 845 SafepointMechanism::ThreadData _poll_data; 846 ThreadSafepointState* _safepoint_state; // Holds information about a thread during a safepoint 847 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 848 NOT_PRODUCT(bool _requires_cross_modify_fence;) // State used by VerifyCrossModifyFence 849 #ifdef ASSERT 850 // Debug support for checking if code allows safepoints or not. 851 // Safepoints in the VM can happen because of allocation, invoking a VM operation, or blocking on 852 // mutex, or blocking on an object synchronizer (Java locking). 853 // If _no_safepoint_count is non-zero, then an assertion failure will happen in any of 854 // the above cases. The class NoSafepointVerifier is used to set this counter. 855 int _no_safepoint_count; // If 0, thread allow a safepoint to happen 856 857 public: 858 void inc_no_safepoint_count() { _no_safepoint_count++; } 859 void dec_no_safepoint_count() { _no_safepoint_count--; } 860 #endif // ASSERT 861 public: 862 // These functions check conditions before possibly going to a safepoint. 863 // including NoSafepointVerifier. 864 void check_for_valid_safepoint_state() NOT_DEBUG_RETURN; 865 void check_possible_safepoint() NOT_DEBUG_RETURN; 866 867 #ifdef ASSERT 868 private: 869 volatile uint64_t _visited_for_critical_count; 870 871 public: 872 void set_visited_for_critical_count(uint64_t safepoint_id) { 873 assert(_visited_for_critical_count == 0, "Must be reset before set"); 874 assert((safepoint_id & 0x1) == 1, "Must be odd"); 875 _visited_for_critical_count = safepoint_id; 876 } 877 void reset_visited_for_critical_count(uint64_t safepoint_id) { 878 assert(_visited_for_critical_count == safepoint_id, "Was not visited"); 879 _visited_for_critical_count = 0; 880 } 881 bool was_visited_for_critical_count(uint64_t safepoint_id) const { 882 return _visited_for_critical_count == safepoint_id; 883 } 884 #endif // ASSERT 885 886 // JavaThread termination support 887 public: 888 enum TerminatedTypes { 889 _not_terminated = 0xDEAD - 2, 890 _thread_exiting, // JavaThread::exit() has been called for this thread 891 _thread_terminated, // JavaThread is removed from thread list 892 _vm_exited // JavaThread is still executing native code, but VM is terminated 893 // only VM_Exit can set _vm_exited 894 }; 895 896 private: 897 // In general a JavaThread's _terminated field transitions as follows: 898 // 899 // _not_terminated => _thread_exiting => _thread_terminated 900 // 901 // _vm_exited is a special value to cover the case of a JavaThread 902 // executing native code after the VM itself is terminated. 903 volatile TerminatedTypes _terminated; 904 905 jint _in_deopt_handler; // count of deoptimization 906 // handlers thread is in 907 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 908 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 909 // never locked) when throwing an exception. Used by interpreter only. 910 911 // JNI attach states: 912 enum JNIAttachStates { 913 _not_attaching_via_jni = 1, // thread is not attaching via JNI 914 _attaching_via_jni, // thread is attaching via JNI 915 _attached_via_jni // thread has attached via JNI 916 }; 917 918 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 919 // A native thread that is attaching via JNI starts with a value 920 // of _attaching_via_jni and transitions to _attached_via_jni. 921 volatile JNIAttachStates _jni_attach_state; 922 923 924 #if INCLUDE_JVMCI 925 // The _pending_* fields below are used to communicate extra information 926 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. 927 928 // Communicates the DeoptReason and DeoptAction of the uncommon trap 929 int _pending_deoptimization; 930 931 // Specifies whether the uncommon trap is to bci 0 of a synchronized method 932 // before the monitor has been acquired. 933 bool _pending_monitorenter; 934 935 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter 936 bool _pending_transfer_to_interpreter; 937 938 // True if in a runtime call from compiled code that will deoptimize 939 // and re-execute a failed heap allocation in the interpreter. 940 bool _in_retryable_allocation; 941 942 // An id of a speculation that JVMCI compiled code can use to further describe and 943 // uniquely identify the speculative optimization guarded by an uncommon trap. 944 // See JVMCINMethodData::SPECULATION_LENGTH_BITS for further details. 945 jlong _pending_failed_speculation; 946 947 // These fields are mutually exclusive in terms of live ranges. 948 union { 949 // Communicates the pc at which the most recent implicit exception occurred 950 // from the signal handler to a deoptimization stub. 951 address _implicit_exception_pc; 952 953 // Communicates an alternative call target to an i2c stub from a JavaCall . 954 address _alternate_call_target; 955 } _jvmci; 956 957 // Support for high precision, thread sensitive counters in JVMCI compiled code. 958 jlong* _jvmci_counters; 959 960 // Fast thread locals for use by JVMCI 961 jlong _jvmci_reserved0; 962 jlong _jvmci_reserved1; 963 oop _jvmci_reserved_oop0; 964 965 public: 966 static jlong* _jvmci_old_thread_counters; 967 static void collect_counters(jlong* array, int length); 968 969 bool resize_counters(int current_size, int new_size); 970 971 static bool resize_all_jvmci_counters(int new_size); 972 973 void set_jvmci_reserved_oop0(oop value) { 974 _jvmci_reserved_oop0 = value; 975 } 976 977 oop get_jvmci_reserved_oop0() { 978 return _jvmci_reserved_oop0; 979 } 980 981 void set_jvmci_reserved0(jlong value) { 982 _jvmci_reserved0 = value; 983 } 984 985 jlong get_jvmci_reserved0() { 986 return _jvmci_reserved0; 987 } 988 989 void set_jvmci_reserved1(jlong value) { 990 _jvmci_reserved1 = value; 991 } 992 993 jlong get_jvmci_reserved1() { 994 return _jvmci_reserved1; 995 } 996 997 private: 998 #endif // INCLUDE_JVMCI 999 1000 StackOverflow _stack_overflow_state; 1001 1002 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 1003 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 1004 // code) 1005 volatile oop _exception_oop; // Exception thrown in compiled code 1006 volatile address _exception_pc; // PC where exception happened 1007 volatile address _exception_handler_pc; // PC for handler of exception 1008 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 1009 1010 private: 1011 // support for JNI critical regions 1012 jint _jni_active_critical; // count of entries into JNI critical region 1013 1014 // Checked JNI: function name requires exception check 1015 char* _pending_jni_exception_check_fn; 1016 1017 // For deadlock detection. 1018 int _depth_first_number; 1019 1020 // JVMTI PopFrame support 1021 // This is set to popframe_pending to signal that top Java frame should be popped immediately 1022 int _popframe_condition; 1023 1024 // If reallocation of scalar replaced objects fails, we throw OOM 1025 // and during exception propagation, pop the top 1026 // _frames_to_pop_failed_realloc frames, the ones that reference 1027 // failed reallocations. 1028 int _frames_to_pop_failed_realloc; 1029 1030 friend class VMThread; 1031 friend class ThreadWaitTransition; 1032 friend class VM_Exit; 1033 1034 // Stack watermark barriers. 1035 StackWatermarks _stack_watermarks; 1036 1037 public: 1038 inline StackWatermarks* stack_watermarks() { return &_stack_watermarks; } 1039 1040 public: 1041 // Constructor 1042 JavaThread(); // delegating constructor 1043 JavaThread(bool is_attaching_via_jni); // for main thread and JNI attached threads 1044 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 1045 ~JavaThread(); 1046 1047 #ifdef ASSERT 1048 // verify this JavaThread hasn't be published in the Threads::list yet 1049 void verify_not_published(); 1050 #endif // ASSERT 1051 1052 StackOverflow* stack_overflow_state() { return &_stack_overflow_state; } 1053 1054 //JNI functiontable getter/setter for JVMTI jni function table interception API. 1055 void set_jni_functions(struct JNINativeInterface_* functionTable) { 1056 _jni_environment.functions = functionTable; 1057 } 1058 struct JNINativeInterface_* get_jni_functions() { 1059 return (struct JNINativeInterface_ *)_jni_environment.functions; 1060 } 1061 1062 // This function is called at thread creation to allow 1063 // platform specific thread variables to be initialized. 1064 void cache_global_variables(); 1065 1066 // Executes Shutdown.shutdown() 1067 void invoke_shutdown_hooks(); 1068 1069 // Cleanup on thread exit 1070 enum ExitType { 1071 normal_exit, 1072 jni_detach 1073 }; 1074 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 1075 1076 void cleanup_failed_attach_current_thread(bool is_daemon); 1077 1078 // Testers 1079 virtual bool is_Java_thread() const { return true; } 1080 virtual bool can_call_java() const { return true; } 1081 1082 virtual bool is_active_Java_thread() const { 1083 return on_thread_list() && !is_terminated(); 1084 } 1085 1086 // Thread oop. threadObj() can be NULL for initial JavaThread 1087 // (or for threads attached via JNI) 1088 oop threadObj() const; 1089 void set_threadObj(oop p); 1090 1091 // Prepare thread and add to priority queue. If a priority is 1092 // not specified, use the priority of the thread object. Threads_lock 1093 // must be held while this function is called. 1094 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 1095 1096 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 1097 address saved_exception_pc() { return _saved_exception_pc; } 1098 1099 ThreadFunction entry_point() const { return _entry_point; } 1100 1101 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1102 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS); 1103 1104 // Last frame anchor routines 1105 1106 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1107 1108 // last_Java_sp 1109 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1110 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1111 1112 // last_Java_pc 1113 1114 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1115 1116 // Safepoint support 1117 inline JavaThreadState thread_state() const; 1118 inline void set_thread_state(JavaThreadState s); 1119 inline void set_thread_state_fence(JavaThreadState s); // fence after setting thread state 1120 inline ThreadSafepointState* safepoint_state() const; 1121 inline void set_safepoint_state(ThreadSafepointState* state); 1122 inline bool is_at_poll_safepoint(); 1123 1124 // JavaThread termination and lifecycle support: 1125 void smr_delete(); 1126 bool on_thread_list() const { return _on_thread_list; } 1127 void set_on_thread_list() { _on_thread_list = true; } 1128 1129 // thread has called JavaThread::exit() or is terminated 1130 bool is_exiting() const; 1131 // thread is terminated (no longer on the threads list); we compare 1132 // against the two non-terminated values so that a freed JavaThread 1133 // will also be considered terminated. 1134 bool check_is_terminated(TerminatedTypes l_terminated) const { 1135 return l_terminated != _not_terminated && l_terminated != _thread_exiting; 1136 } 1137 bool is_terminated() const; 1138 void set_terminated(TerminatedTypes t); 1139 1140 void block_if_vm_exited(); 1141 1142 bool doing_unsafe_access() { return _doing_unsafe_access; } 1143 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1144 1145 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1146 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1147 1148 SafepointMechanism::ThreadData* poll_data() { return &_poll_data; } 1149 1150 void set_requires_cross_modify_fence(bool val) PRODUCT_RETURN NOT_PRODUCT({ _requires_cross_modify_fence = val; }) 1151 1152 private: 1153 DEBUG_ONLY(void verify_frame_info();) 1154 1155 // Support for thread handshake operations 1156 HandshakeState _handshake; 1157 public: 1158 HandshakeState* handshake_state() { return &_handshake; } 1159 1160 // A JavaThread can always safely operate on it self and other threads 1161 // can do it safely if they are the active handshaker. 1162 bool is_handshake_safe_for(Thread* th) const { 1163 return _handshake.active_handshaker() == th || this == th; 1164 } 1165 1166 // Suspend/resume support for JavaThread 1167 bool java_suspend(); // higher-level suspension logic called by the public APIs 1168 bool java_resume(); // higher-level resume logic called by the public APIs 1169 bool is_suspended() { return _handshake.is_suspended(); } 1170 1171 // Check for async exception in addition to safepoint. 1172 static void check_special_condition_for_native_trans(JavaThread *thread); 1173 1174 // Synchronize with another thread that is deoptimizing objects of the 1175 // current thread, i.e. reverts optimizations based on escape analysis. 1176 void wait_for_object_deoptimization(); 1177 1178 // these next two are also used for self-suspension and async exception support 1179 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1180 1181 // Return true if JavaThread has an asynchronous condition or 1182 // if external suspension is requested. 1183 bool has_special_runtime_exit_condition() { 1184 return (_async_exception_condition != _no_async_condition) || 1185 (_suspend_flags & (_obj_deopt JFR_ONLY(| _trace_flag))) != 0; 1186 } 1187 1188 // Fast-locking support 1189 bool is_lock_owned(address adr) const; 1190 1191 // Accessors for vframe array top 1192 // The linked list of vframe arrays are sorted on sp. This means when we 1193 // unpack the head must contain the vframe array to unpack. 1194 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1195 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1196 1197 // Side structure for deferring update of java frame locals until deopt occurs 1198 JvmtiDeferredUpdates* deferred_updates() const { return _jvmti_deferred_updates; } 1199 void set_deferred_updates(JvmtiDeferredUpdates* du) { _jvmti_deferred_updates = du; } 1200 1201 // These only really exist to make debugging deopt problems simpler 1202 1203 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1204 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1205 1206 // The special resourceMark used during deoptimization 1207 1208 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1209 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1210 1211 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; } 1212 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; } 1213 1214 Method* callee_target() const { return _callee_target; } 1215 void set_callee_target (Method* x) { _callee_target = x; } 1216 1217 // Oop results of vm runtime calls 1218 oop vm_result() const { return _vm_result; } 1219 void set_vm_result (oop x) { _vm_result = x; } 1220 1221 Metadata* vm_result_2() const { return _vm_result_2; } 1222 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1223 1224 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1225 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1226 1227 #if INCLUDE_JVMCI 1228 int pending_deoptimization() const { return _pending_deoptimization; } 1229 jlong pending_failed_speculation() const { return _pending_failed_speculation; } 1230 bool has_pending_monitorenter() const { return _pending_monitorenter; } 1231 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } 1232 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } 1233 void set_pending_failed_speculation(jlong failed_speculation) { _pending_failed_speculation = failed_speculation; } 1234 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } 1235 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; } 1236 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; } 1237 1238 virtual bool in_retryable_allocation() const { return _in_retryable_allocation; } 1239 void set_in_retryable_allocation(bool b) { _in_retryable_allocation = b; } 1240 #endif // INCLUDE_JVMCI 1241 1242 // Exception handling for compiled methods 1243 oop exception_oop() const; 1244 address exception_pc() const { return _exception_pc; } 1245 address exception_handler_pc() const { return _exception_handler_pc; } 1246 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1247 1248 void set_exception_oop(oop o); 1249 void set_exception_pc(address a) { _exception_pc = a; } 1250 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1251 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1252 1253 void clear_exception_oop_and_pc() { 1254 set_exception_oop(NULL); 1255 set_exception_pc(NULL); 1256 } 1257 1258 // Check if address is in the usable part of the stack (excludes protected 1259 // guard pages). Can be applied to any thread and is an approximation for 1260 // using is_in_live_stack when the query has to happen from another thread. 1261 bool is_in_usable_stack(address adr) const { 1262 return is_in_stack_range_incl(adr, _stack_overflow_state.stack_reserved_zone_base()); 1263 } 1264 1265 // Misc. accessors/mutators 1266 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1267 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1268 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1269 1270 // For assembly stub generation 1271 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } 1272 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } 1273 static ByteSize pending_jni_exception_check_fn_offset() { 1274 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn); 1275 } 1276 static ByteSize last_Java_sp_offset() { 1277 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1278 } 1279 static ByteSize last_Java_pc_offset() { 1280 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1281 } 1282 static ByteSize frame_anchor_offset() { 1283 return byte_offset_of(JavaThread, _anchor); 1284 } 1285 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } 1286 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } 1287 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } 1288 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } 1289 static ByteSize polling_word_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_word);} 1290 static ByteSize polling_page_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_page);} 1291 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } 1292 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } 1293 #if INCLUDE_JVMCI 1294 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); } 1295 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); } 1296 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); } 1297 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); } 1298 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); } 1299 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); } 1300 #endif // INCLUDE_JVMCI 1301 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } 1302 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } 1303 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1304 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1305 1306 // StackOverflow offsets 1307 static ByteSize stack_overflow_limit_offset() { 1308 return byte_offset_of(JavaThread, _stack_overflow_state._stack_overflow_limit); 1309 } 1310 static ByteSize stack_guard_state_offset() { 1311 return byte_offset_of(JavaThread, _stack_overflow_state._stack_guard_state); 1312 } 1313 static ByteSize reserved_stack_activation_offset() { 1314 return byte_offset_of(JavaThread, _stack_overflow_state._reserved_stack_activation); 1315 } 1316 1317 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } 1318 1319 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1320 static ByteSize should_post_on_exceptions_flag_offset() { 1321 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1322 } 1323 static ByteSize doing_unsafe_access_offset() { return byte_offset_of(JavaThread, _doing_unsafe_access); } 1324 NOT_PRODUCT(static ByteSize requires_cross_modify_fence_offset() { return byte_offset_of(JavaThread, _requires_cross_modify_fence); }) 1325 1326 // Returns the jni environment for this thread 1327 JNIEnv* jni_environment() { return &_jni_environment; } 1328 1329 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1330 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1331 // Only return NULL if thread is off the thread list; starting to 1332 // exit should not return NULL. 1333 if (thread_from_jni_env->is_terminated()) { 1334 thread_from_jni_env->block_if_vm_exited(); 1335 return NULL; 1336 } else { 1337 return thread_from_jni_env; 1338 } 1339 } 1340 1341 // JNI critical regions. These can nest. 1342 bool in_critical() { return _jni_active_critical > 0; } 1343 bool in_last_critical() { return _jni_active_critical == 1; } 1344 inline void enter_critical(); 1345 void exit_critical() { 1346 assert(Thread::current() == this, "this must be current thread"); 1347 _jni_active_critical--; 1348 assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); 1349 } 1350 1351 // Checked JNI: is the programmer required to check for exceptions, if so specify 1352 // which function name. Returning to a Java frame should implicitly clear the 1353 // pending check, this is done for Native->Java transitions (i.e. user JNI code). 1354 // VM->Java transistions are not cleared, it is expected that JNI code enclosed 1355 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal). 1356 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1357 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1358 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1359 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1360 1361 // For deadlock detection 1362 int depth_first_number() { return _depth_first_number; } 1363 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1364 1365 private: 1366 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1367 1368 public: 1369 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1370 void add_monitor_chunk(MonitorChunk* chunk); 1371 void remove_monitor_chunk(MonitorChunk* chunk); 1372 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1373 void inc_in_deopt_handler() { _in_deopt_handler++; } 1374 void dec_in_deopt_handler() { 1375 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1376 if (_in_deopt_handler > 0) { // robustness 1377 _in_deopt_handler--; 1378 } 1379 } 1380 1381 private: 1382 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1383 1384 public: 1385 1386 // Frame iteration; calls the function f for all frames on the stack 1387 void frames_do(void f(frame*, const RegisterMap*)); 1388 1389 // Memory operations 1390 void oops_do_frames(OopClosure* f, CodeBlobClosure* cf); 1391 void oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf); 1392 1393 // Sweeper operations 1394 virtual void nmethods_do(CodeBlobClosure* cf); 1395 1396 // RedefineClasses Support 1397 void metadata_do(MetadataClosure* f); 1398 1399 // Debug method asserting thread states are correct during a handshake operation. 1400 DEBUG_ONLY(void verify_states_for_handshake();) 1401 1402 // Misc. operations 1403 char* name() const { return (char*)get_thread_name(); } 1404 static const char* name_for(oop thread_obj); 1405 void print_on(outputStream* st, bool print_extended_info) const; 1406 void print_on(outputStream* st) const { print_on(st, false); } 1407 void print() const; 1408 void print_thread_state_on(outputStream*) const PRODUCT_RETURN; 1409 void print_on_error(outputStream* st, char* buf, int buflen) const; 1410 void print_name_on_error(outputStream* st, char* buf, int buflen) const; 1411 void verify(); 1412 const char* get_thread_name() const; 1413 protected: 1414 // factor out low-level mechanics for use in both normal and error cases 1415 virtual const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1416 public: 1417 // Accessing frames 1418 frame last_frame() { 1419 _anchor.make_walkable(); 1420 return pd_last_frame(); 1421 } 1422 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1423 1424 // Returns method at 'depth' java or native frames down the stack 1425 // Used for security checks 1426 Klass* security_get_caller_class(int depth); 1427 1428 // Print stack trace in external format 1429 void print_stack_on(outputStream* st); 1430 void print_stack() { print_stack_on(tty); } 1431 1432 // Print stack traces in various internal formats 1433 void trace_stack() PRODUCT_RETURN; 1434 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1435 void trace_frames() PRODUCT_RETURN; 1436 1437 // Print an annotated view of the stack frames 1438 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1439 void validate_frame_layout() { 1440 print_frame_layout(0, true); 1441 } 1442 1443 // Function for testing deoptimization 1444 void deoptimize(); 1445 void make_zombies(); 1446 1447 void deoptimize_marked_methods(); 1448 1449 public: 1450 // Returns the running thread as a JavaThread 1451 static inline JavaThread* current(); 1452 // Returns the current thread as a JavaThread, or NULL if not attached 1453 static inline JavaThread* current_or_null(); 1454 1455 // Returns the active Java thread. Do not use this if you know you are calling 1456 // from a JavaThread, as it's slower than JavaThread::current. If called from 1457 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1458 // operation. You may not want that either. 1459 static JavaThread* active(); 1460 1461 protected: 1462 virtual void pre_run(); 1463 virtual void run(); 1464 void thread_main_inner(); 1465 virtual void post_run(); 1466 1467 public: 1468 // Thread local information maintained by JVMTI. 1469 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1470 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1471 // getter is used to get this JavaThread's JvmtiThreadState if it has 1472 // one which means NULL can be returned. JvmtiThreadState::state_for() 1473 // is used to get the specified JavaThread's JvmtiThreadState if it has 1474 // one or it allocates a new JvmtiThreadState for the JavaThread and 1475 // returns it. JvmtiThreadState::state_for() will return NULL only if 1476 // the specified JavaThread is exiting. 1477 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1478 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1479 1480 // JVMTI PopFrame support 1481 // Setting and clearing popframe_condition 1482 // All of these enumerated values are bits. popframe_pending 1483 // indicates that a PopFrame() has been requested and not yet been 1484 // completed. popframe_processing indicates that that PopFrame() is in 1485 // the process of being completed. popframe_force_deopt_reexecution_bit 1486 // indicates that special handling is required when returning to a 1487 // deoptimized caller. 1488 enum PopCondition { 1489 popframe_inactive = 0x00, 1490 popframe_pending_bit = 0x01, 1491 popframe_processing_bit = 0x02, 1492 popframe_force_deopt_reexecution_bit = 0x04 1493 }; 1494 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1495 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1496 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1497 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1498 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1499 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1500 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1501 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1502 1503 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1504 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1505 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1506 1507 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1508 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1509 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1510 1511 private: 1512 // Saved incoming arguments to popped frame. 1513 // Used only when popped interpreted frame returns to deoptimized frame. 1514 void* _popframe_preserved_args; 1515 int _popframe_preserved_args_size; 1516 1517 public: 1518 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1519 void* popframe_preserved_args(); 1520 ByteSize popframe_preserved_args_size(); 1521 WordSize popframe_preserved_args_size_in_words(); 1522 void popframe_free_preserved_args(); 1523 1524 1525 private: 1526 JvmtiThreadState *_jvmti_thread_state; 1527 1528 // Used by the interpreter in fullspeed mode for frame pop, method 1529 // entry, method exit and single stepping support. This field is 1530 // only set to non-zero at a safepoint or using a direct handshake 1531 // (see EnterInterpOnlyModeClosure). 1532 // It can be set to zero asynchronously to this threads execution (i.e., without 1533 // safepoint/handshake or a lock) so we have to be very careful. 1534 // Accesses by other threads are synchronized using JvmtiThreadState_lock though. 1535 int _interp_only_mode; 1536 1537 public: 1538 // used by the interpreter for fullspeed debugging support (see above) 1539 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1540 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1541 int get_interp_only_mode() { return _interp_only_mode; } 1542 void increment_interp_only_mode() { ++_interp_only_mode; } 1543 void decrement_interp_only_mode() { --_interp_only_mode; } 1544 1545 // support for cached flag that indicates whether exceptions need to be posted for this thread 1546 // if this is false, we can avoid deoptimizing when events are thrown 1547 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1548 private: 1549 int _should_post_on_exceptions_flag; 1550 1551 public: 1552 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1553 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1554 1555 private: 1556 ThreadStatistics *_thread_stat; 1557 1558 public: 1559 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1560 1561 // Return a blocker object for which this thread is blocked parking. 1562 oop current_park_blocker(); 1563 1564 private: 1565 static size_t _stack_size_at_create; 1566 1567 public: 1568 static inline size_t stack_size_at_create(void) { 1569 return _stack_size_at_create; 1570 } 1571 static inline void set_stack_size_at_create(size_t value) { 1572 _stack_size_at_create = value; 1573 } 1574 1575 // Machine dependent stuff 1576 #include OS_CPU_HEADER(thread) 1577 1578 // JSR166 per-thread parker 1579 private: 1580 Parker _parker; 1581 public: 1582 Parker* parker() { return &_parker; } 1583 1584 // Biased locking support 1585 private: 1586 GrowableArray<MonitorInfo*>* _cached_monitor_info; 1587 public: 1588 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 1589 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 1590 1591 // clearing/querying jni attach status 1592 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1593 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1594 inline void set_done_attaching_via_jni(); 1595 1596 // Stack dump assistance: 1597 // Track the class we want to initialize but for which we have to wait 1598 // on its init_lock() because it is already being initialized. 1599 void set_class_to_be_initialized(InstanceKlass* k); 1600 InstanceKlass* class_to_be_initialized() const; 1601 1602 private: 1603 InstanceKlass* _class_to_be_initialized; 1604 1605 // java.lang.Thread.sleep support 1606 ParkEvent * _SleepEvent; 1607 public: 1608 bool sleep(jlong millis); 1609 1610 // java.lang.Thread interruption support 1611 void interrupt(); 1612 bool is_interrupted(bool clear_interrupted); 1613 1614 static OopStorage* thread_oop_storage(); 1615 1616 static void verify_cross_modify_fence_failure(JavaThread *thread) PRODUCT_RETURN; 1617 1618 // AsyncGetCallTrace support 1619 inline bool in_asgct(void) {return _in_asgct;} 1620 inline void set_in_asgct(bool value) {_in_asgct = value;} 1621 }; 1622 1623 // Inline implementation of JavaThread::current 1624 inline JavaThread* JavaThread::current() { 1625 return Thread::current()->as_Java_thread(); 1626 } 1627 1628 inline JavaThread* JavaThread::current_or_null() { 1629 Thread* current = Thread::current_or_null(); 1630 return current != nullptr ? current->as_Java_thread() : nullptr; 1631 } 1632 1633 inline JavaThread* Thread::as_Java_thread() { 1634 assert(is_Java_thread(), "incorrect cast to JavaThread"); 1635 return static_cast<JavaThread*>(this); 1636 } 1637 1638 inline const JavaThread* Thread::as_Java_thread() const { 1639 assert(is_Java_thread(), "incorrect cast to const JavaThread"); 1640 return static_cast<const JavaThread*>(this); 1641 } 1642 1643 // The active thread queue. It also keeps track of the current used 1644 // thread priorities. 1645 class Threads: AllStatic { 1646 friend class VMStructs; 1647 private: 1648 static int _number_of_threads; 1649 static int _number_of_non_daemon_threads; 1650 static int _return_code; 1651 static uintx _thread_claim_token; 1652 #ifdef ASSERT 1653 static bool _vm_complete; 1654 #endif 1655 1656 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS); 1657 static void initialize_jsr292_core_classes(TRAPS); 1658 1659 public: 1660 // Thread management 1661 // force_daemon is a concession to JNI, where we may need to add a 1662 // thread to the thread list before allocating its thread object 1663 static void add(JavaThread* p, bool force_daemon = false); 1664 static void remove(JavaThread* p, bool is_daemon); 1665 static void non_java_threads_do(ThreadClosure* tc); 1666 static void java_threads_do(ThreadClosure* tc); 1667 static void java_threads_and_vm_thread_do(ThreadClosure* tc); 1668 static void threads_do(ThreadClosure* tc); 1669 static void possibly_parallel_threads_do(bool is_par, ThreadClosure* tc); 1670 1671 // Initializes the vm and creates the vm thread 1672 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 1673 static void convert_vm_init_libraries_to_agents(); 1674 static void create_vm_init_libraries(); 1675 static void create_vm_init_agents(); 1676 static void shutdown_vm_agents(); 1677 static void destroy_vm(); 1678 // Supported VM versions via JNI 1679 // Includes JNI_VERSION_1_1 1680 static jboolean is_supported_jni_version_including_1_1(jint version); 1681 // Does not include JNI_VERSION_1_1 1682 static jboolean is_supported_jni_version(jint version); 1683 1684 // The "thread claim token" provides a way for threads to be claimed 1685 // by parallel worker tasks. 1686 // 1687 // Each thread contains a "token" field. A task will claim the 1688 // thread only if its token is different from the global token, 1689 // which is updated by calling change_thread_claim_token(). When 1690 // a thread is claimed, it's token is set to the global token value 1691 // so other threads in the same iteration pass won't claim it. 1692 // 1693 // For this to work change_thread_claim_token() needs to be called 1694 // exactly once in sequential code before starting parallel tasks 1695 // that should claim threads. 1696 // 1697 // New threads get their token set to 0 and change_thread_claim_token() 1698 // never sets the global token to 0. 1699 static uintx thread_claim_token() { return _thread_claim_token; } 1700 static void change_thread_claim_token(); 1701 static void assert_all_threads_claimed() NOT_DEBUG_RETURN; 1702 1703 // Apply "f->do_oop" to all root oops in all threads. 1704 // This version may only be called by sequential code. 1705 static void oops_do(OopClosure* f, CodeBlobClosure* cf); 1706 // This version may be called by sequential or parallel code. 1707 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf); 1708 1709 // RedefineClasses support 1710 static void metadata_do(MetadataClosure* f); 1711 static void metadata_handles_do(void f(Metadata*)); 1712 1713 #ifdef ASSERT 1714 static bool is_vm_complete() { return _vm_complete; } 1715 #endif // ASSERT 1716 1717 // Verification 1718 static void verify(); 1719 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks, bool print_extended_info); 1720 static void print(bool print_stacks, bool internal_format) { 1721 // this function is only used by debug.cpp 1722 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */, false /* simple format */); 1723 } 1724 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 1725 static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf, 1726 int buflen, bool* found_current); 1727 static void print_threads_compiling(outputStream* st, char* buf, int buflen, bool short_form = false); 1728 1729 // Get Java threads that are waiting to enter a monitor. 1730 static GrowableArray<JavaThread*>* get_pending_threads(ThreadsList * t_list, 1731 int count, address monitor); 1732 1733 // Get owning Java thread from the monitor's owner field. 1734 static JavaThread *owning_thread_from_monitor_owner(ThreadsList * t_list, 1735 address owner); 1736 1737 // Number of threads on the active threads list 1738 static int number_of_threads() { return _number_of_threads; } 1739 // Number of non-daemon threads on the active threads list 1740 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 1741 1742 // Deoptimizes all frames tied to marked nmethods 1743 static void deoptimized_wrt_marked_nmethods(); 1744 1745 struct Test; // For private gtest access. 1746 }; 1747 1748 class UnlockFlagSaver { 1749 private: 1750 JavaThread* _thread; 1751 bool _do_not_unlock; 1752 public: 1753 UnlockFlagSaver(JavaThread* t) { 1754 _thread = t; 1755 _do_not_unlock = t->do_not_unlock_if_synchronized(); 1756 t->set_do_not_unlock_if_synchronized(false); 1757 } 1758 ~UnlockFlagSaver() { 1759 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock); 1760 } 1761 }; 1762 1763 #endif // SHARE_RUNTIME_THREAD_HPP