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