New src/share/vm/runtime/thread.hpp (original) (raw)

1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 / 24 25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP 26 #define SHARE_VM_RUNTIME_THREAD_HPP 27 28 #include "gc/shared/threadLocalAllocBuffer.hpp" 29 #include "memory/allocation.hpp" 30 #include "oops/oop.hpp" 31 #include "prims/jni.h" 32 #include "prims/jvmtiExport.hpp" 33 #include "runtime/frame.hpp" 34 #include "runtime/javaFrameAnchor.hpp" 35 #include "runtime/jniHandles.hpp" 36 #include "runtime/mutexLocker.hpp" 37 #include "runtime/os.hpp" 38 #include "runtime/osThread.hpp" 39 #include "runtime/park.hpp" 40 #include "runtime/safepoint.hpp" 41 #include "runtime/stubRoutines.hpp" 42 #include "runtime/threadLocalStorage.hpp" 43 #include "runtime/thread_ext.hpp" 44 #include "runtime/unhandledOops.hpp" 45 #include "trace/traceBackend.hpp" 46 #include "trace/traceMacros.hpp" 47 #include "utilities/exceptions.hpp" 48 #include "utilities/macros.hpp" 49 #include "utilities/top.hpp" 50 #if INCLUDE_ALL_GCS 51 #include "gc/g1/dirtyCardQueue.hpp" 52 #include "gc/g1/satbQueue.hpp" 53 #endif // INCLUDE_ALL_GCS 54 #ifdef TARGET_ARCH_zero 55 # include "stack_zero.hpp" 56 #endif 57 58 class ThreadSafepointState; 59 class ThreadProfiler; 60 61 class JvmtiThreadState; 62 class JvmtiGetLoadedClassesClosure; 63 class ThreadStatistics; 64 class ConcurrentLocksDump; 65 class ParkEvent; 66 class Parker; 67 68 class ciEnv; 69 class CompileThread; 70 class CompileLog; 71 class CompileTask; 72 class CompileQueue; 73 class CompilerCounters; 74 class vframeArray; 75 76 class DeoptResourceMark; 77 class jvmtiDeferredLocalVariableSet; 78 79 class GCTaskQueue; 80 class ThreadClosure; 81 class IdealGraphPrinter; 82 83 class Metadata; 84 template <class T, MEMFLAGS F> class ChunkedList; 85 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer; 86 87 DEBUG_ONLY(class ResourceMark;) 88 89 class WorkerThread; 90 91 // Class hierarchy 92 // - Thread 93 // - NamedThread 94 // - VMThread 95 // - ConcurrentGCThread 96 // - WorkerThread 97 // - GangWorker 98 // - GCTaskThread 99 // - JavaThread 100 // - WatcherThread 101 102 class Thread: public ThreadShadow { 103 friend class VMStructs; 104 private: 105 // Exception handling 106 // (Note: _pending_exception and friends are in ThreadShadow) 107 //oop _pending_exception; // pending exception for current thread 108 // const char _exception_file; // file information for exception (debugging only) 109 // int _exception_line; // line information for exception (debugging only) 110 protected: 111 // Support for forcing alignment of thread objects for biased locking 112 void* _real_malloc_address; 113 public: 114 void* operator new(size_t size) throw() { return allocate(size, true); } 115 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 116 return allocate(size, false); } 117 void operator delete(void* p); 118 119 protected: 120 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 121 private: 122 123 // *************************************************************** 124 // Suspend and resume support 125 // *************************************************************** 126 // 127 // VM suspend/resume no longer exists - it was once used for various 128 // things including safepoints but was deprecated and finally removed 129 // in Java 7. Because VM suspension was considered "internal" Java-level 130 // suspension was considered "external", and this legacy naming scheme 131 // remains. 132 // 133 // External suspend/resume requests come from JVM_SuspendThread, 134 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI 135 // ResumeThread. External 136 // suspend requests cause _external_suspend to be set and external 137 // resume requests cause _external_suspend to be cleared. 138 // External suspend requests do not nest on top of other external 139 // suspend requests. The higher level APIs reject suspend requests 140 // for already suspended threads. 141 // 142 // The external_suspend 143 // flag is checked by has_special_runtime_exit_condition() and java thread 144 // will self-suspend when handle_special_runtime_exit_condition() is 145 // called. Most uses of the _thread_blocked state in JavaThreads are 146 // considered the same as being externally suspended; if the blocking 147 // condition lifts, the JavaThread will self-suspend. Other places 148 // where VM checks for external_suspend include: 149 // + mutex granting (do not enter monitors when thread is suspended) 150 // + state transitions from _thread_in_native 151 // 152 // In general, java_suspend() does not wait for an external suspend 153 // request to complete. When it returns, the only guarantee is that 154 // the _external_suspend field is true. 155 // 156 // wait_for_ext_suspend_completion() is used to wait for an external 157 // suspend request to complete. External suspend requests are usually 158 // followed by some other interface call that requires the thread to 159 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into 160 // the interface that requires quiescence, we give the JavaThread a 161 // chance to self-suspend before we need it to be quiescent. This 162 // improves overall suspend/query performance. 163 // 164 // suspend_flags controls the behavior of java suspend/resume. 165 // It must be set under the protection of SR_lock. Read from the flag is 166 // OK without SR_lock as long as the value is only used as a hint. 167 // (e.g., check _external_suspend first without lock and then recheck 168 // inside SR_lock and finish the suspension) 169 // 170 // _suspend_flags is also overloaded for other "special conditions" so 171 // that a single check indicates whether any special action is needed 172 // eg. for async exceptions. 173 // ------------------------------------------------------------------- 174 // Notes: 175 // 1. The suspend/resume logic no longer uses ThreadState in OSThread 176 // but we still update its value to keep other part of the system (mainly 177 // JVMTI) happy. ThreadState is legacy code (see notes in 178 // osThread.hpp). 179 // 180 // 2. It would be more natural if set_external_suspend() is private and 181 // part of java_suspend(), but that probably would affect the suspend/query 182 // performance. Need more investigation on this. 183 184 // suspend/resume lock: used for self-suspend 185 Monitor* _SR_lock; 186 187 protected: 188 enum SuspendFlags { 189 // NOTE: avoid using the sign-bit as cc generates different test code 190 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 191 192 _external_suspend = 0x20000000U, // thread is asked to self suspend 193 _ext_suspended = 0x40000000U, // thread has self-suspended 194 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt 195 196 _has_async_exception = 0x00000001U, // there is a pending async exception 197 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock 198 }; 199 200 // various suspension related flags - atomically updated 201 // overloaded for async exception checking in check_special_condition_for_native_trans. 202 volatile uint32_t _suspend_flags; 203 204 private: 205 int _num_nested_signal; 206 207 DEBUG_ONLY(bool _suspendible_thread;) 208 209 public: 210 void enter_signal_handler() { _num_nested_signal++; } 211 void leave_signal_handler() { _num_nested_signal--; } 212 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } 213 214 #ifdef ASSERT 215 void set_suspendible_thread() { 216 _suspendible_thread = true; 217 } 218 219 void clear_suspendible_thread() { 220 _suspendible_thread = false; 221 } 222 223 bool is_suspendible_thread() { return _suspendible_thread; } 224 #endif 225 226 private: 227 // Active_handles points to a block of handles 228 JNIHandleBlock* _active_handles; 229 230 // One-element thread local free list 231 JNIHandleBlock* _free_handle_block; 232 233 // Point to the last handle mark 234 HandleMark* _last_handle_mark; 235 236 // The parity of the last strong_roots iteration in which this thread was 237 // claimed as a task. 238 jint _oops_do_parity; 239 240 public: 241 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 242 HandleMark* last_handle_mark() const { return _last_handle_mark; } 243 private: 244 245 // debug support for checking if code does allow safepoints or not 246 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on 247 // mutex, or blocking on an object synchronizer (Java locking). 248 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases 249 // If !allow_allocation(), then an assertion failure will happen during allocation 250 // (Hence, !allow_safepoint() => !allow_allocation()). 251 // 252 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. 253 // 254 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen 255 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. 256 257 // Used by SkipGCALot class. 258 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 259 260 friend class No_Alloc_Verifier; 261 friend class No_Safepoint_Verifier; 262 friend class Pause_No_Safepoint_Verifier; 263 friend class ThreadLocalStorage; 264 friend class GC_locker; 265 266 ThreadLocalAllocBuffer _tlab; // Thread-local eden 267 jlong _allocated_bytes; // Cumulative number of bytes allocated on 268 // the Java heap 269 270 TRACE_DATA _trace_data; // Thread-local data for tracing 271 272 ThreadExt _ext; 273 274 int _vm_operation_started_count; // VM_Operation support 275 int _vm_operation_completed_count; // VM_Operation support 276 277 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread 278 // is waiting to lock 279 bool _current_pending_monitor_is_from_java; // locking is from Java code 280 281 // ObjectMonitor on which this thread called Object.wait() 282 ObjectMonitor* _current_waiting_monitor; 283 284 // Private thread-local objectmonitor list - a simple cache organized as a SLL. 285 public: 286 ObjectMonitor* omFreeList; 287 int omFreeCount; // length of omFreeList 288 int omFreeProvision; // reload chunk size 289 ObjectMonitor* omInUseList; // SLL to track monitors in circulation 290 int omInUseCount; // length of omInUseList 291 292 #ifdef ASSERT 293 private: 294 bool _visited_for_critical_count; 295 296 public: 297 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } 298 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } 299 #endif 300 301 public: 302 enum { 303 is_definitely_current_thread = true 304 }; 305 306 // Constructor 307 Thread(); 308 virtual ~Thread(); 309 310 // initializtion 311 void initialize_thread_local_storage(); 312 313 // thread entry point 314 virtual void run(); 315 316 // Testers 317 virtual bool is_VM_thread() const { return false; } 318 virtual bool is_Java_thread() const { return false; } 319 virtual bool is_Compiler_thread() const { return false; } 320 virtual bool is_Code_cache_sweeper_thread() const { return false; } 321 virtual bool is_hidden_from_external_view() const { return false; } 322 virtual bool is_jvmti_agent_thread() const { return false; } 323 // True iff the thread can perform GC operations at a safepoint. 324 // Generally will be true only of VM thread and parallel GC WorkGang 325 // threads. 326 virtual bool is_GC_task_thread() const { return false; } 327 virtual bool is_Watcher_thread() const { return false; } 328 virtual bool is_ConcurrentGC_thread() const { return false; } 329 virtual bool is_Named_thread() const { return false; } 330 virtual bool is_Worker_thread() const { return false; } 331 332 // Can this thread make Java upcalls 333 virtual bool can_call_java() const { return false; } 334 335 // Casts 336 virtual WorkerThread* as_Worker_thread() const { return NULL; } 337 338 virtual char* name() const { return (char*)"Unknown thread"; } 339 340 // Returns the current thread 341 static inline Thread* current(); 342 // ... without having to include thread.inline.hpp. 343 static Thread* current_noinline(); 344 345 // Common thread operations 346 static void set_priority(Thread* thread, ThreadPriority priority); 347 static ThreadPriority get_priority(const Thread* const thread); 348 static void start(Thread* thread); 349 static void interrupt(Thread* thr); 350 static bool is_interrupted(Thread* thr, bool clear_interrupted); 351 352 void set_native_thread_name(const char name) { 353 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); 354 os::set_native_thread_name(name); 355 } 356 357 ObjectMonitor* omInUseList_addr() { return (ObjectMonitor )&omInUseList; } 358 Monitor SR_lock() const { return _SR_lock; } 359 360 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } 361 362 inline void set_suspend_flag(SuspendFlags f); 363 inline void clear_suspend_flag(SuspendFlags f); 364 365 inline void set_has_async_exception(); 366 inline void clear_has_async_exception(); 367 368 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } 369 370 inline void set_critical_native_unlock(); 371 inline void clear_critical_native_unlock(); 372 373 // Support for Unhandled Oop detection 374 #ifdef CHECK_UNHANDLED_OOPS 375 private: 376 UnhandledOops _unhandled_oops; 377 public: 378 UnhandledOops* unhandled_oops() { return _unhandled_oops; } 379 // Mark oop safe for gc. It may be stack allocated but won't move. 380 void allow_unhandled_oop(oop op) { 381 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); 382 } 383 // Clear oops at safepoint so crashes point to unhandled oop violator 384 void clear_unhandled_oops() { 385 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); 386 } 387 #endif // CHECK_UNHANDLED_OOPS 388 389 #ifndef PRODUCT 390 bool skip_gcalot() { return _skip_gcalot; } 391 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 392 #endif 393 394 public: 395 // Installs a pending exception to be inserted later 396 static void send_async_exception(oop thread_oop, oop java_throwable); 397 398 // Resource area 399 ResourceArea resource_area() const { return _resource_area; } 400 void set_resource_area(ResourceArea* area) { _resource_area = area; } 401 402 OSThread* osthread() const { return _osthread; } 403 void set_osthread(OSThread* thread) { _osthread = thread; } 404 405 // JNI handle support 406 JNIHandleBlock* active_handles() const { return _active_handles; } 407 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 408 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 409 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 410 411 // Internal handle support 412 HandleArea* handle_area() const { return _handle_area; } 413 void set_handle_area(HandleArea* area) { _handle_area = area; } 414 415 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 416 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 417 418 // Thread-Local Allocation Buffer (TLAB) support 419 ThreadLocalAllocBuffer& tlab() { return _tlab; } 420 void initialize_tlab() { 421 if (UseTLAB) { 422 tlab().initialize(); 423 } 424 } 425 426 jlong allocated_bytes() { return _allocated_bytes; } 427 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 428 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 429 inline jlong cooked_allocated_bytes(); 430 431 TRACE_DATA* trace_data() { return &_trace_data; } 432 433 const ThreadExt& ext() const { return _ext; } 434 ThreadExt& ext() { return _ext; } 435 436 // VM operation support 437 int vm_operation_ticket() { return ++_vm_operation_started_count; } 438 int vm_operation_completed_count() { return _vm_operation_completed_count; } 439 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } 440 441 // For tracking the heavyweight monitor the thread is pending on. 442 ObjectMonitor* current_pending_monitor() { 443 return _current_pending_monitor; 444 } 445 void set_current_pending_monitor(ObjectMonitor* monitor) { 446 _current_pending_monitor = monitor; 447 } 448 void set_current_pending_monitor_is_from_java(bool from_java) { 449 _current_pending_monitor_is_from_java = from_java; 450 } 451 bool current_pending_monitor_is_from_java() { 452 return _current_pending_monitor_is_from_java; 453 } 454 455 // For tracking the ObjectMonitor on which this thread called Object.wait() 456 ObjectMonitor* current_waiting_monitor() { 457 return _current_waiting_monitor; 458 } 459 void set_current_waiting_monitor(ObjectMonitor* monitor) { 460 _current_waiting_monitor = monitor; 461 } 462 463 // GC support 464 // Apply "f->do_oop" to all root oops in "this". 465 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive. 466 // Used by JavaThread::oops_do. 467 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 468 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 469 470 // Handles the parallel case for the method below. 471 private: 472 bool claim_oops_do_par_case(int collection_parity); 473 public: 474 // Requires that "collection_parity" is that of the current roots 475 // iteration. If "is_par" is false, sets the parity of "this" to 476 // "collection_parity", and returns "true". If "is_par" is true, 477 // uses an atomic instruction to set the current threads parity to 478 // "collection_parity", if it is not already. Returns "true" iff the 479 // calling thread does the update, this indicates that the calling thread 480 // has claimed the thread's stack as a root groop in the current 481 // collection. 482 bool claim_oops_do(bool is_par, int collection_parity) { 483 if (!is_par) { 484 _oops_do_parity = collection_parity; 485 return true; 486 } else { 487 return claim_oops_do_par_case(collection_parity); 488 } 489 } 490 491 // Sweeper support 492 void nmethods_do(CodeBlobClosure* cf); 493 494 // jvmtiRedefineClasses support 495 void metadata_handles_do(void f(Metadata*)); 496 497 // Used by fast lock support 498 virtual bool is_lock_owned(address adr) const; 499 500 // Check if address is in the stack of the thread (not just for locks). 501 // Warning: the method can only be used on the running thread 502 bool is_in_stack(address adr) const; 503 // Check if address is in the usable part of the stack (excludes protected 504 // guard pages) 505 bool is_in_usable_stack(address adr) const; 506 507 // Sets this thread as starting thread. Returns failure if thread 508 // creation fails due to lack of memory, too many threads etc. 509 bool set_as_starting_thread(); 510 511 protected: 512 // OS data associated with the thread 513 OSThread* _osthread; // Platform-specific thread information 514 515 // Thread local resource area for temporary allocation within the VM 516 ResourceArea* _resource_area; 517 518 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 519 520 // Thread local handle area for allocation of handles within the VM 521 HandleArea* _handle_area; 522 GrowableArray<Metadata*>* _metadata_handles; 523 524 // Support for stack overflow handling, get_thread, etc. 525 address _stack_base; 526 size_t _stack_size; 527 uintptr_t _self_raw_id; // used by get_thread (mutable) 528 int _lgrp_id; 529 530 public: 531 // Stack overflow support 532 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 533 534 void set_stack_base(address base) { _stack_base = base; } 535 size_t stack_size() const { return _stack_size; } 536 void set_stack_size(size_t size) { _stack_size = size; } 537 void record_stack_base_and_size(); 538 539 bool on_local_stack(address adr) const { 540 // QQQ this has knowledge of direction, ought to be a stack method 541 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); 542 } 543 544 uintptr_t self_raw_id() { return _self_raw_id; } 545 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } 546 547 int lgrp_id() const { return _lgrp_id; } 548 void set_lgrp_id(int value) { _lgrp_id = value; } 549 550 // Printing 551 virtual void print_on(outputStream* st) const; 552 void print() const { print_on(tty); } 553 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 554 555 // Debug-only code 556 #ifdef ASSERT 557 private: 558 // Deadlock detection support for Mutex locks. List of locks own by thread. 559 Monitor* _owned_locks; 560 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 561 // thus the friendship 562 friend class Mutex; 563 friend class Monitor; 564 565 public: 566 void print_owned_locks_on(outputStream* st) const; 567 void print_owned_locks() const { print_owned_locks_on(tty); } 568 Monitor* owned_locks() const { return _owned_locks; } 569 bool owns_locks() const { return owned_locks() != NULL; } 570 bool owns_locks_but_compiled_lock() const; 571 int oops_do_parity() const { return _oops_do_parity; } 572 573 // Deadlock detection 574 bool allow_allocation() { return _allow_allocation_count == 0; } 575 ResourceMark* current_resource_mark() { return _current_resource_mark; } 576 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 577 #endif 578 579 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; 580 581 private: 582 volatile int _jvmti_env_iteration_count; 583 584 public: 585 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 586 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 587 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 588 589 // Code generation 590 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); } 591 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); } 592 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); } 593 594 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); } 595 static ByteSize stack_size_offset() { return byte_offset_of(Thread, stack_size); } 596 597 #define TLAB_FIELD_OFFSET(name)
598 static ByteSize tlab##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } 599 600 TLAB_FIELD_OFFSET(start) 601 TLAB_FIELD_OFFSET(end) 602 TLAB_FIELD_OFFSET(top) 603 TLAB_FIELD_OFFSET(pf_top) 604 TLAB_FIELD_OFFSET(size) // desired_size 605 TLAB_FIELD_OFFSET(refill_waste_limit) 606 TLAB_FIELD_OFFSET(number_of_refills) 607 TLAB_FIELD_OFFSET(fast_refill_waste) 608 TLAB_FIELD_OFFSET(slow_allocations) 609 610 #undef TLAB_FIELD_OFFSET 611 612 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); } 613 614 public: 615 volatile intptr_t _Stalled; 616 volatile int _TypeTag; 617 ParkEvent * _ParkEvent; // for synchronized() 618 ParkEvent * _SleepEvent; // for Thread.sleep 619 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor 620 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease 621 int NativeSyncRecursion; // diagnostic 622 623 volatile int _OnTrap; // Resume-at IP delta 624 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG 625 jint _hashStateX; // thread-specific hashCode generator state 626 jint _hashStateY; 627 jint _hashStateZ; 628 void * schedctl; 629 630 631 volatile jint rng[4]; // RNG for spin loop 632 633 // Low-level leaf-lock primitives used to implement synchronization 634 // and native monitor-mutex infrastructure. 635 // Not for general synchronization use. 636 static void SpinAcquire(volatile int * Lock, const char * Name); 637 static void SpinRelease(volatile int * Lock); 638 static void muxAcquire(volatile intptr_t * Lock, const char * Name); 639 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev); 640 static void muxRelease(volatile intptr_t * Lock); 641 }; 642 643 // Inline implementation of Thread::current() 644 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of 645 // startup. 646 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same 647 // period. This is inlined in thread.inline.hpp. 648 649 inline Thread* Thread::current() { 650 #ifdef ASSERT 651 // This function is very high traffic. Define PARANOID to enable expensive 652 // asserts. 653 #ifdef PARANOID 654 // Signal handler should call ThreadLocalStorage::get_thread_slow() 655 Thread* t = ThreadLocalStorage::get_thread_slow(); 656 assert(t != NULL && !t->is_inside_signal_handler(), 657 "Don't use Thread::current() inside signal handler"); 658 #endif 659 #endif 660 Thread* thread = ThreadLocalStorage::thread(); 661 assert(thread != NULL, "just checking"); 662 return thread; 663 } 664 665 // Name support for threads. non-JavaThread subclasses with multiple 666 // uniquely named instances should derive from this. 667 class NamedThread: public Thread { 668 friend class VMStructs; 669 enum { 670 max_name_len = 64 671 }; 672 private: 673 char* _name; 674 // log JavaThread being processed by oops_do 675 JavaThread* _processed_thread; 676 677 public: 678 NamedThread(); 679 ~NamedThread(); 680 // May only be called once per thread. 681 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); 682 void initialize_named_thread(); 683 virtual bool is_Named_thread() const { return true; } 684 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } 685 JavaThread processed_thread() { return _processed_thread; } 686 void set_processed_thread(JavaThread thread) { _processed_thread = thread; } 687 virtual void print_on(outputStream st) const; 688 }; 689 690 // Worker threads are named and have an id of an assigned work. 691 class WorkerThread: public NamedThread { 692 private: 693 uint _id; 694 public: 695 WorkerThread() : _id(0) { } 696 virtual bool is_Worker_thread() const { return true; } 697 698 virtual WorkerThread as_Worker_thread() const { 699 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); 700 return (WorkerThread*) this; 701 } 702 703 void set_id(uint work_id) { _id = work_id; } 704 uint id() const { return _id; } 705 }; 706 707 // A single WatcherThread is used for simulating timer interrupts. 708 class WatcherThread: public Thread { 709 friend class VMStructs; 710 public: 711 virtual void run(); 712 713 private: 714 static WatcherThread* _watcher_thread; 715 716 static bool _startable; 717 // volatile due to at least one lock-free read 718 volatile static bool _should_terminate; 719 720 os::WatcherThreadCrashProtection* _crash_protection; 721 public: 722 enum SomeConstants { 723 delay_interval = 10 // interrupt delay in milliseconds 724 }; 725 726 // Constructor 727 WatcherThread(); 728 729 // Tester 730 bool is_Watcher_thread() const { return true; } 731 732 // Printing 733 char* name() const { return (char*)"VM Periodic Task Thread"; } 734 void print_on(outputStream* st) const; 735 void unpark(); 736 737 // Returns the single instance of WatcherThread 738 static WatcherThread* watcher_thread() { return _watcher_thread; } 739 740 // Create and start the single instance of WatcherThread, or stop it on shutdown 741 static void start(); 742 static void stop(); 743 // Only allow start once the VM is sufficiently initialized 744 // Otherwise the first task to enroll will trigger the start 745 static void make_startable(); 746 747 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) { 748 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread"); 749 _crash_protection = crash_protection; 750 } 751 752 bool has_crash_protection() const { return _crash_protection != NULL; } 753 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; } 754 755 private: 756 int sleep() const; 757 }; 758 759 760 class CompilerThread; 761 762 typedef void (ThreadFunction)(JavaThread, TRAPS); 763 764 class JavaThread: public Thread { 765 friend class VMStructs; 766 friend class WhiteBox; 767 private: 768 JavaThread* _next; // The next thread in the Threads list 769 oop _threadObj; // The Java level thread object 770 771 #ifdef ASSERT 772 private: 773 int _java_call_counter; 774 775 public: 776 int java_call_counter() { return _java_call_counter; } 777 void inc_java_call_counter() { _java_call_counter++; } 778 void dec_java_call_counter() { 779 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 780 _java_call_counter--; 781 } 782 private: // restore original namespace restriction 783 #endif // ifdef ASSERT 784 785 #ifndef PRODUCT 786 public: 787 enum { 788 jump_ring_buffer_size = 16 789 }; 790 private: // restore original namespace restriction 791 #endif 792 793 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 794 795 ThreadFunction _entry_point; 796 797 JNIEnv _jni_environment; 798 799 // Deopt support 800 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 801 802 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we 803 // transition out of native 804 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized 805 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 806 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 807 // Because deoptimization is lazy we must save jvmti requests to set locals 808 // in compiled frames until we deoptimize and we have an interpreter frame. 809 // This holds the pointer to array (yeah like there might be more than one) of 810 // description of compiled vframes that have locals that need to be updated. 811 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; 812 813 // Handshake value for fixing 6243940. We need a place for the i2c 814 // adapter to store the callee Method*. This value is NEVER live 815 // across a gc point so it does NOT have to be gc'd 816 // The handshake is open ended since we can't be certain that it will 817 // be NULLed. This is because we rarely ever see the race and end up 818 // in handle_wrong_method which is the backend of the handshake. See 819 // code in i2c adapters and handle_wrong_method. 820 821 Method* _callee_target; 822 823 // Used to pass back results to the interpreter or generated code running Java code. 824 oop _vm_result; // oop result is GC-preserved 825 Metadata* _vm_result_2; // non-oop result 826 827 // See ReduceInitialCardMarks: this holds the precise space interval of 828 // the most recent slow path allocation for which compiled code has 829 // elided card-marks for performance along the fast-path. 830 MemRegion _deferred_card_mark; 831 832 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 833 // allocated during deoptimization 834 // and by JNI_MonitorEnter/Exit 835 836 // Async. requests support 837 enum AsyncRequests { 838 _no_async_condition = 0, 839 _async_exception, 840 _async_unsafe_access_error 841 }; 842 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request 843 oop _pending_async_exception; 844 845 // Safepoint support 846 public: // Expose _thread_state for SafeFetchInt() 847 volatile JavaThreadState _thread_state; 848 private: 849 ThreadSafepointState _safepoint_state; // Holds information about a thread during a safepoint 850 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 851 852 // JavaThread termination support 853 enum TerminatedTypes { 854 _not_terminated = 0xDEAD - 2, 855 _thread_exiting, // JavaThread::exit() has been called for this thread 856 _thread_terminated, // JavaThread is removed from thread list 857 _vm_exited // JavaThread is still executing native code, but VM is terminated 858 // only VM_Exit can set _vm_exited 859 }; 860 861 // In general a JavaThread's _terminated field transitions as follows: 862 // 863 // _not_terminated => _thread_exiting => _thread_terminated 864 // 865 // _vm_exited is a special value to cover the case of a JavaThread 866 // executing native code after the VM itself is terminated. 867 volatile TerminatedTypes _terminated; 868 // suspend/resume support 869 volatile bool _suspend_equivalent; // Suspend equivalent condition 870 jint _in_deopt_handler; // count of deoptimization 871 // handlers thread is in 872 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 873 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 874 // never locked) when throwing an exception. Used by interpreter only. 875 876 // JNI attach states: 877 enum JNIAttachStates { 878 _not_attaching_via_jni = 1, // thread is not attaching via JNI 879 _attaching_via_jni, // thread is attaching via JNI 880 _attached_via_jni // thread has attached via JNI 881 }; 882 883 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 884 // A native thread that is attaching via JNI starts with a value 885 // of _attaching_via_jni and transitions to _attached_via_jni. 886 volatile JNIAttachStates _jni_attach_state; 887 888 public: 889 // State of the stack guard pages for this thread. 890 enum StackGuardState { 891 stack_guard_unused, // not needed 892 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow 893 stack_guard_enabled // enabled 894 }; 895 896 private: 897 898 #if INCLUDE_JVMCI 899 // The pending fields below are used to communicate extra information 900 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. 901 902 // Communicates the DeoptReason and DeoptAction of the uncommon trap 903 int _pending_deoptimization; 904 905 // An object that JVMCI compiled code can use to further describe and 906 // uniquely identify the speculative optimization guarded by the uncommon trap 907 oop _pending_failed_speculation; 908 909 // Specifies whether the uncommon trap is to bci 0 of a synchronized method 910 // before the monitor has been acquired. 911 bool _pending_monitorenter; 912 913 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter 914 bool _pending_transfer_to_interpreter; 915 916 // These fields are mutually exclusive in terms of live ranges. 917 union { 918 // Communicates the pc at which the most recent implicit exception occurred 919 // from the signal handler to a deoptimization stub. 920 address _implicit_exception_pc; 921 922 // Communicates an alternative call target to an i2c stub from a JavaCall . 923 address _alternate_call_target; 924 } _jvmci; 925 926 // Support for high precision, thread sensitive counters in JVMCI compiled code. 927 jlong* _jvmci_counters; 928 929 public: 930 static jlong* _jvmci_old_thread_counters; 931 static void collect_counters(typeArrayOop array); 932 private: 933 #endif 934 935 StackGuardState _stack_guard_state; 936 937 // Precompute the limit of the stack as used in stack overflow checks. 938 // We load it from here to simplify the stack overflow check in assembly. 939 address _stack_overflow_limit; 940 941 // Compiler exception handling (NOTE: The _exception_oop is NOT the same as _pending_exception. It is 942 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 943 // code) 944 volatile oop _exception_oop; // Exception thrown in compiled code 945 volatile address _exception_pc; // PC where exception happened 946 volatile address _exception_handler_pc; // PC for handler of exception 947 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 948 949 private:
950 // support for JNI critical regions 951 jint _jni_active_critical; // count of entries into JNI critical region 952 953 // Checked JNI: function name requires exception check 954 char* _pending_jni_exception_check_fn; 955 956 // For deadlock detection. 957 int _depth_first_number; 958 959 // JVMTI PopFrame support 960 // This is set to popframe_pending to signal that top Java frame should be popped immediately 961 int _popframe_condition; 962 963 // If reallocation of scalar replaced objects fails, we throw OOM 964 // and during exception propagation, pop the top 965 // _frames_to_pop_failed_realloc frames, the ones that reference 966 // failed reallocations. 967 int _frames_to_pop_failed_realloc; 968 969 #ifndef PRODUCT 970 int _jmp_ring_index; 971 struct { 972 // We use intptr_t instead of address so debugger doesn't try and display strings 973 intptr_t _target; 974 intptr_t _instruction; 975 const char* _file; 976 int _line; 977 } _jmp_ring[jump_ring_buffer_size]; 978 #endif // PRODUCT 979 980 #if INCLUDE_ALL_GCS 981 // Support for G1 barriers 982 983 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. 984 // Set of all such queues. 985 static SATBMarkQueueSet _satb_mark_queue_set; 986 987 DirtyCardQueue dirty_card_queue; // Thread-local log for dirty cards. 988 // Set of all such queues. 989 static DirtyCardQueueSet dirty_card_queue_set; 990 991 void flush_barrier_queues(); 992 #endif // INCLUDE_ALL_GCS 993 994 friend class VMThread; 995 friend class ThreadWaitTransition; 996 friend class VM_Exit; 997 998 void initialize(); // Initialized the instance variables 999 1000 public: 1001 // Constructor 1002 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads 1003 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 1004 ~JavaThread(); 1005 1006 #ifdef ASSERT 1007 // verify this JavaThread hasn't be published in the Threads::list yet 1008 void verify_not_published(); 1009 #endif 1010 1011 //JNI functiontable getter/setter for JVMTI jni function table interception API. 1012 void set_jni_functions(struct JNINativeInterface* functionTable) { 1013 jni_environment.functions = functionTable; 1014 } 1015 struct JNINativeInterface* get_jni_functions() { 1016 return (struct JNINativeInterface )_jni_environment.functions; 1017 } 1018 1019 // This function is called at thread creation to allow 1020 // platform specific thread variables to be initialized. 1021 void cache_global_variables(); 1022 1023 // Executes Shutdown.shutdown() 1024 void invoke_shutdown_hooks(); 1025 1026 // Cleanup on thread exit 1027 enum ExitType { 1028 normal_exit, 1029 jni_detach 1030 }; 1031 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 1032 1033 void cleanup_failed_attach_current_thread(); 1034 1035 // Testers 1036 virtual bool is_Java_thread() const { return true; } 1037 virtual bool can_call_java() const { return true; } 1038 1039 // Thread chain operations 1040 JavaThread next() const { return _next; } 1041 void set_next(JavaThread* p) { _next = p; } 1042 1043 // Thread oop. threadObj() can be NULL for initial JavaThread 1044 // (or for threads attached via JNI) 1045 oop threadObj() const { return _threadObj; } 1046 void set_threadObj(oop p) { _threadObj = p; } 1047 1048 ThreadPriority java_priority() const; // Read from threadObj() 1049 1050 // Prepare thread and add to priority queue. If a priority is 1051 // not specified, use the priority of the thread object. Threads_lock 1052 // must be held while this function is called. 1053 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 1054 void prepare_ext(); 1055 1056 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 1057 address saved_exception_pc() { return _saved_exception_pc; } 1058 1059 1060 ThreadFunction entry_point() const { return _entry_point; } 1061 1062 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1063 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS); 1064 1065 // Last frame anchor routines 1066 1067 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1068 1069 // last_Java_sp 1070 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1071 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1072 1073 // last_Java_pc 1074 1075 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1076 1077 // Safepoint support 1078 #if !(defined(PPC64) || defined(AARCH64)) 1079 JavaThreadState thread_state() const { return _thread_state; } 1080 void set_thread_state(JavaThreadState s) { _thread_state = s; } 1081 #else 1082 // Use membars when accessing volatile _thread_state. See 1083 // Threads::create_vm() for size checks. 1084 inline JavaThreadState thread_state() const; 1085 inline void set_thread_state(JavaThreadState s); 1086 #endif 1087 ThreadSafepointState safepoint_state() const { return _safepoint_state; } 1088 void set_safepoint_state(ThreadSafepointState state) { _safepoint_state = state; } 1089 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } 1090 1091 // thread has called JavaThread::exit() or is terminated 1092 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } 1093 // thread is terminated (no longer on the threads list); we compare 1094 // against the two non-terminated values so that a freed JavaThread 1095 // will also be considered terminated. 1096 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } 1097 void set_terminated(TerminatedTypes t) { _terminated = t; } 1098 // special for Threads::remove() which is static: 1099 void set_terminated_value() { _terminated = _thread_terminated; } 1100 void block_if_vm_exited(); 1101 1102 bool doing_unsafe_access() { return _doing_unsafe_access; } 1103 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1104 1105 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1106 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1107 1108 // Suspend/resume support for JavaThread 1109 private: 1110 inline void set_ext_suspended(); 1111 inline void clear_ext_suspended(); 1112 1113 public: 1114 void java_suspend(); 1115 void java_resume(); 1116 int java_suspend_self(); 1117 1118 void check_and_wait_while_suspended() { 1119 assert(JavaThread::current() == this, "sanity check"); 1120 1121 bool do_self_suspend; 1122 do { 1123 // were we externally suspended while we were waiting? 1124 do_self_suspend = handle_special_suspend_equivalent_condition(); 1125 if (do_self_suspend) { 1126 // don't surprise the thread that suspended us by returning 1127 java_suspend_self(); 1128 set_suspend_equivalent(); 1129 } 1130 } while (do_self_suspend); 1131 } 1132 static void check_safepoint_and_suspend_for_native_trans(JavaThread thread); 1133 // Check for async exception in addition to safepoint and suspend request. 1134 static void check_special_condition_for_native_trans(JavaThread thread); 1135 1136 // Same as check_special_condition_for_native_trans but finishes the 1137 // transition into thread_in_Java mode so that it can potentially 1138 // block. 1139 static void check_special_condition_for_native_trans_and_transition(JavaThread thread); 1140 1141 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t bits); 1142 bool is_ext_suspend_completed_with_lock(uint32_t bits) { 1143 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1144 // Warning: is_ext_suspend_completed() may temporarily drop the 1145 // SR_lock to allow the thread to reach a stable thread state if 1146 // it is currently in a transient thread state. 1147 return is_ext_suspend_completed(false / !called_by_wait /, 1148 SuspendRetryDelay, bits); 1149 } 1150 1151 // We cannot allow wait_for_ext_suspend_completion() to run forever or 1152 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally 1153 // passed as the count and delay parameters. Experiments with specific 1154 // calls to wait_for_ext_suspend_completion() can be done by passing 1155 // other values in the code. Experiments with all calls can be done 1156 // via the appropriate -XX options. 1157 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t bits); 1158 1159 inline void set_external_suspend(); 1160 inline void clear_external_suspend(); 1161 1162 inline void set_deopt_suspend(); 1163 inline void clear_deopt_suspend(); 1164 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } 1165 1166 bool is_external_suspend() const { 1167 return (_suspend_flags & _external_suspend) != 0; 1168 } 1169 // Whenever a thread transitions from native to vm/java it must suspend 1170 // if external|deopt suspend is present. 1171 bool is_suspend_after_native() const { 1172 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0; 1173 } 1174 1175 // external suspend request is completed 1176 bool is_ext_suspended() const { 1177 return (_suspend_flags & _ext_suspended) != 0; 1178 } 1179 1180 bool is_external_suspend_with_lock() const { 1181 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1182 return is_external_suspend(); 1183 } 1184 1185 // Special method to handle a pending external suspend request 1186 // when a suspend equivalent condition lifts. 1187 bool handle_special_suspend_equivalent_condition() { 1188 assert(is_suspend_equivalent(), 1189 "should only be called in a suspend equivalence condition"); 1190 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1191 bool ret = is_external_suspend(); 1192 if (!ret) { 1193 // not about to self-suspend so clear suspend equivalence 1194 clear_suspend_equivalent(); 1195 } 1196 // implied else: 1197 // We have a pending external suspend request so we leave the 1198 // suspend_equivalent flag set until java_suspend_self() sets 1199 // the ext_suspended flag and clears the suspend_equivalent 1200 // flag. This insures that wait_for_ext_suspend_completion() 1201 // will return consistent values. 1202 return ret; 1203 } 1204 1205 // utility methods to see if we are doing some kind of suspension 1206 bool is_being_ext_suspended() const { 1207 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1208 return is_ext_suspended() || is_external_suspend(); 1209 } 1210 1211 bool is_suspend_equivalent() const { return _suspend_equivalent; } 1212 1213 void set_suspend_equivalent() { _suspend_equivalent = true; } 1214 void clear_suspend_equivalent() { _suspend_equivalent = false; } 1215 1216 // Thread.stop support 1217 void send_thread_stop(oop throwable); 1218 AsyncRequests clear_special_runtime_exit_condition() { 1219 AsyncRequests x = _special_runtime_exit_condition; 1220 _special_runtime_exit_condition = _no_async_condition; 1221 return x; 1222 } 1223 1224 // Are any async conditions present? 1225 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } 1226 1227 void check_and_handle_async_exceptions(bool check_unsafe_error = true); 1228 1229 // these next two are also used for self-suspension and async exception support 1230 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1231 1232 // Return true if JavaThread has an asynchronous condition or 1233 // if external suspension is requested. 1234 bool has_special_runtime_exit_condition() { 1235 // We call is_external_suspend() last since external suspend should 1236 // be less common. Because we don't use is_external_suspend_with_lock 1237 // it is possible that we won't see an asynchronous external suspend 1238 // request that has just gotten started, i.e., SR_lock grabbed but 1239 // _external_suspend field change either not made yet or not visible 1240 // yet. However, this is okay because the request is asynchronous and 1241 // we will see the new flag value the next time through. It's also 1242 // possible that the external suspend request is dropped after 1243 // we have checked is_external_suspend(), we will recheck its value 1244 // under SR_lock in java_suspend_self(). 1245 return (_special_runtime_exit_condition != _no_async_condition) || 1246 is_external_suspend() || is_deopt_suspend(); 1247 } 1248 1249 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } 1250 1251 inline void set_pending_async_exception(oop e); 1252 1253 // Fast-locking support 1254 bool is_lock_owned(address adr) const; 1255 1256 // Accessors for vframe array top 1257 // The linked list of vframe arrays are sorted on sp. This means when we 1258 // unpack the head must contain the vframe array to unpack. 1259 void set_vframe_array_head(vframeArray value) { _vframe_array_head = value; } 1260 vframeArray vframe_array_head() const { return _vframe_array_head; } 1261 1262 // Side structure for deferring update of java frame locals until deopt occurs 1263 GrowableArray<jvmtiDeferredLocalVariableSet*> deferred_locals() const { return _deferred_locals_updates; } 1264 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *> vf) { _deferred_locals_updates = vf; } 1265 1266 // These only really exist to make debugging deopt problems simpler 1267 1268 void set_vframe_array_last(vframeArray value) { _vframe_array_last = value; } 1269 vframeArray vframe_array_last() const { return _vframe_array_last; } 1270 1271 // The special resourceMark used during deoptimization 1272 1273 void set_deopt_mark(DeoptResourceMark value) { _deopt_mark = value; } 1274 DeoptResourceMark deopt_mark(void) { return _deopt_mark; } 1275 1276 intptr_t* must_deopt_id() { return _must_deopt_id; } 1277 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } 1278 void clear_must_deopt_id() { _must_deopt_id = NULL; } 1279 1280 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } 1281 nmethod* deopt_nmethod() { return _deopt_nmethod; } 1282 1283 Method* callee_target() const { return _callee_target; } 1284 void set_callee_target (Method* x) { _callee_target = x; } 1285 1286 // Oop results of vm runtime calls 1287 oop vm_result() const { return _vm_result; } 1288 void set_vm_result (oop x) { _vm_result = x; } 1289 1290 Metadata* vm_result_2() const { return _vm_result_2; } 1291 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1292 1293 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1294 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1295 1296 #if INCLUDE_JVMCI 1297 int pending_deoptimization() const { return _pending_deoptimization; } 1298 oop pending_failed_speculation() const { return _pending_failed_speculation; } 1299 bool has_pending_monitorenter() const { return _pending_monitorenter; } 1300 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } 1301 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } 1302 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; } 1303 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } 1304 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; } 1305 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; } 1306 #endif 1307 1308 // Exception handling for compiled methods 1309 oop exception_oop() const { return _exception_oop; } 1310 address exception_pc() const { return _exception_pc; } 1311 address exception_handler_pc() const { return _exception_handler_pc; } 1312 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1313 1314 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); } 1315 void set_exception_pc(address a) { _exception_pc = a; } 1316 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1317 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1318 1319 void clear_exception_oop_and_pc() { 1320 set_exception_oop(NULL); 1321 set_exception_pc(NULL); 1322 } 1323 1324 // Stack overflow support 1325 inline size_t stack_available(address cur_sp); 1326 address stack_yellow_zone_base() { 1327 return (address)(stack_base() - 1328 (stack_size() - 1329 (stack_red_zone_size() + stack_yellow_zone_size()))); 1330 } 1331 size_t stack_yellow_zone_size() { 1332 return StackYellowPages * os::vm_page_size(); 1333 } 1334 address stack_red_zone_base() { 1335 return (address)(stack_base() - (stack_size() - stack_red_zone_size())); 1336 } 1337 size_t stack_red_zone_size() { return StackRedPages * os::vm_page_size(); } 1338 bool in_stack_yellow_zone(address a) { 1339 return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); 1340 } 1341 bool in_stack_red_zone(address a) { 1342 return (a <= stack_red_zone_base()) && 1343 (a >= (address)((intptr_t)stack_base() - stack_size())); 1344 } 1345 1346 void create_stack_guard_pages(); 1347 void remove_stack_guard_pages(); 1348 1349 void enable_stack_yellow_zone(); 1350 void disable_stack_yellow_zone(); 1351 void enable_stack_red_zone(); 1352 void disable_stack_red_zone(); 1353 1354 inline bool stack_guard_zone_unused(); 1355 inline bool stack_yellow_zone_disabled(); 1356 inline bool stack_yellow_zone_enabled(); 1357 1358 // Attempt to reguard the stack after a stack overflow may have occurred. 1359 // Returns true if (a) guard pages are not needed on this thread, (b) the 1360 // pages are already guarded, or (c) the pages were successfully reguarded. 1361 // Returns false if there is not enough stack space to reguard the pages, in 1362 // which case the caller should unwind a frame and try again. The argument 1363 // should be the caller's (approximate) sp. 1364 bool reguard_stack(address cur_sp); 1365 // Similar to above but see if current stackpoint is out of the guard area 1366 // and reguard if possible. 1367 bool reguard_stack(void); 1368 1369 address stack_overflow_limit() { return _stack_overflow_limit; } 1370 void set_stack_overflow_limit() { 1371 _stack_overflow_limit = _stack_base - _stack_size + 1372 ((StackShadowPages + 1373 StackYellowPages + 1374 StackRedPages) * os::vm_page_size()); 1375 } 1376 1377 // Misc. accessors/mutators 1378 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1379 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1380 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1381 1382 #ifndef PRODUCT 1383 void record_jump(address target, address instr, const char* file, int line); 1384 #endif // PRODUCT 1385 1386 // For assembly stub generation 1387 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } 1388 #ifndef PRODUCT 1389 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); } 1390 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); } 1391 #endif // PRODUCT 1392 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } 1393 static ByteSize last_Java_sp_offset() { 1394 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1395 } 1396 static ByteSize last_Java_pc_offset() { 1397 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1398 } 1399 static ByteSize frame_anchor_offset() { 1400 return byte_offset_of(JavaThread, _anchor); 1401 } 1402 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } 1403 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } 1404 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } 1405 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } 1406 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } 1407 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } 1408 #if INCLUDE_JVMCI 1409 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); } 1410 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); } 1411 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); } 1412 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); } 1413 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); } 1414 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); } 1415 #endif 1416 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } 1417 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } 1418 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1419 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } 1420 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1421 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); } 1422 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } 1423 1424 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1425 static ByteSize should_post_on_exceptions_flag_offset() { 1426 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1427 } 1428 1429 #if INCLUDE_ALL_GCS 1430 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } 1431 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } 1432 #endif // INCLUDE_ALL_GCS 1433 1434 // Returns the jni environment for this thread 1435 JNIEnv* jni_environment() { return &_jni_environment; } 1436 1437 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1438 JavaThread thread_from_jni_env = (JavaThread)((intptr_t)env - in_bytes(jni_environment_offset())); 1439 // Only return NULL if thread is off the thread list; starting to 1440 // exit should not return NULL. 1441 if (thread_from_jni_env->is_terminated()) { 1442 thread_from_jni_env->block_if_vm_exited(); 1443 return NULL; 1444 } else { 1445 return thread_from_jni_env; 1446 } 1447 } 1448 1449 // JNI critical regions. These can nest. 1450 bool in_critical() { return _jni_active_critical > 0; } 1451 bool in_last_critical() { return _jni_active_critical == 1; } 1452 void enter_critical() { 1453 assert(Thread::current() == this || 1454 (Thread::current()->is_VM_thread() && 1455 SafepointSynchronize::is_synchronizing()), 1456 "this must be current thread or synchronizing"); 1457 _jni_active_critical++; 1458 } 1459 void exit_critical() { 1460 assert(Thread::current() == this, "this must be current thread"); 1461 _jni_active_critical--; 1462 assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); 1463 } 1464 1465 // Checked JNI, is the programmer required to check for exceptions, specify which function name 1466 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1467 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1468 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1469 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1470 1471 // For deadlock detection 1472 int depth_first_number() { return _depth_first_number; } 1473 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1474 1475 private: 1476 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1477 1478 public: 1479 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1480 void add_monitor_chunk(MonitorChunk* chunk); 1481 void remove_monitor_chunk(MonitorChunk* chunk); 1482 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1483 void inc_in_deopt_handler() { _in_deopt_handler++; } 1484 void dec_in_deopt_handler() { 1485 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1486 if (_in_deopt_handler > 0) { // robustness 1487 _in_deopt_handler--; 1488 } 1489 } 1490 1491 private: 1492 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1493 1494 public: 1495 1496 // Frame iteration; calls the function f for all frames on the stack 1497 void frames_do(void f(frame*, const RegisterMap*)); 1498 1499 // Memory operations 1500 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1501 1502 // Sweeper operations 1503 void nmethods_do(CodeBlobClosure* cf); 1504 1505 // RedefineClasses Support 1506 void metadata_do(void f(Metadata*)); 1507 1508 // Misc. operations 1509 char* name() const { return (char*)get_thread_name(); } 1510 void print_on(outputStream* st) const; 1511 void print_value(); 1512 void print_thread_state_on(outputStream*) const PRODUCT_RETURN; 1513 void print_thread_state() const PRODUCT_RETURN; 1514 void print_on_error(outputStream* st, char* buf, int buflen) const; 1515 void verify(); 1516 const char* get_thread_name() const; 1517 private: 1518 // factor out low-level mechanics for use in both normal and error cases 1519 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1520 public: 1521 const char* get_threadgroup_name() const; 1522 const char* get_parent_name() const; 1523 1524 // Accessing frames 1525 frame last_frame() { 1526 _anchor.make_walkable(this); 1527 return pd_last_frame(); 1528 } 1529 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1530 1531 // Returns method at 'depth' java or native frames down the stack 1532 // Used for security checks 1533 Klass* security_get_caller_class(int depth); 1534 1535 // Print stack trace in external format 1536 void print_stack_on(outputStream* st); 1537 void print_stack() { print_stack_on(tty); } 1538 1539 // Print stack traces in various internal formats 1540 void trace_stack() PRODUCT_RETURN; 1541 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1542 void trace_frames() PRODUCT_RETURN; 1543 void trace_oops() PRODUCT_RETURN; 1544 1545 // Print an annotated view of the stack frames 1546 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1547 void validate_frame_layout() { 1548 print_frame_layout(0, true); 1549 } 1550 1551 // Returns the number of stack frames on the stack 1552 int depth() const; 1553 1554 // Function for testing deoptimization 1555 void deoptimize(); 1556 void make_zombies(); 1557 1558 void deoptimized_wrt_marked_nmethods(); 1559 1560 // Profiling operation (see fprofile.cpp) 1561 public: 1562 bool profile_last_Java_frame(frame* fr); 1563 1564 private: 1565 ThreadProfiler* _thread_profiler; 1566 private: 1567 friend class FlatProfiler; // uses both [gs]et_thread_profiler. 1568 friend class FlatProfilerTask; // uses get_thread_profiler. 1569 friend class ThreadProfilerMark; // uses get_thread_profiler. 1570 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } 1571 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { 1572 ThreadProfiler* result = _thread_profiler; 1573 _thread_profiler = tp; 1574 return result; 1575 } 1576 1577 public: 1578 // Returns the running thread as a JavaThread 1579 static inline JavaThread* current(); 1580 1581 // Returns the active Java thread. Do not use this if you know you are calling 1582 // from a JavaThread, as it's slower than JavaThread::current. If called from 1583 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1584 // operation. You may not want that either. 1585 static JavaThread* active(); 1586 1587 inline CompilerThread* as_CompilerThread(); 1588 1589 public: 1590 virtual void run(); 1591 void thread_main_inner(); 1592 1593 private: 1594 // PRIVILEGED STACK 1595 PrivilegedElement* _privileged_stack_top; 1596 GrowableArray* _array_for_gc; 1597 public: 1598 1599 // Returns the privileged_stack information. 1600 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } 1601 void set_privileged_stack_top(PrivilegedElement e) { _privileged_stack_top = e; } 1602 void register_array_for_gc(GrowableArray array) { _array_for_gc = array; } 1603 1604 public: 1605 // Thread local information maintained by JVMTI. 1606 void set_jvmti_thread_state(JvmtiThreadState value) { _jvmti_thread_state = value; } 1607 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1608 // getter is used to get this JavaThread's JvmtiThreadState if it has 1609 // one which means NULL can be returned. JvmtiThreadState::state_for() 1610 // is used to get the specified JavaThread's JvmtiThreadState if it has 1611 // one or it allocates a new JvmtiThreadState for the JavaThread and 1612 // returns it. JvmtiThreadState::state_for() will return NULL only if 1613 // the specified JavaThread is exiting. 1614 JvmtiThreadState jvmti_thread_state() const { return _jvmti_thread_state; } 1615 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1616 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure value) { _jvmti_get_loaded_classes_closure = value; } 1617 JvmtiGetLoadedClassesClosure get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } 1618 1619 // JVMTI PopFrame support 1620 // Setting and clearing popframe_condition 1621 // All of these enumerated values are bits. popframe_pending 1622 // indicates that a PopFrame() has been requested and not yet been 1623 // completed. popframe_processing indicates that that PopFrame() is in 1624 // the process of being completed. popframe_force_deopt_reexecution_bit 1625 // indicates that special handling is required when returning to a 1626 // deoptimized caller. 1627 enum PopCondition { 1628 popframe_inactive = 0x00, 1629 popframe_pending_bit = 0x01, 1630 popframe_processing_bit = 0x02, 1631 popframe_force_deopt_reexecution_bit = 0x04 1632 }; 1633 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1634 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1635 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1636 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1637 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1638 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1639 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1640 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1641 #ifdef CC_INTERP 1642 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } 1643 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } 1644 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1645 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1646 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1647 #endif 1648 1649 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1650 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1651 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1652 1653 private: 1654 // Saved incoming arguments to popped frame. 1655 // Used only when popped interpreted frame returns to deoptimized frame. 1656 void* _popframe_preserved_args; 1657 int _popframe_preserved_args_size; 1658 1659 public: 1660 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1661 void* popframe_preserved_args(); 1662 ByteSize popframe_preserved_args_size(); 1663 WordSize popframe_preserved_args_size_in_words(); 1664 void popframe_free_preserved_args(); 1665 1666 1667 private: 1668 JvmtiThreadState _jvmti_thread_state; 1669 JvmtiGetLoadedClassesClosure _jvmti_get_loaded_classes_closure; 1670 1671 // Used by the interpreter in fullspeed mode for frame pop, method 1672 // entry, method exit and single stepping support. This field is 1673 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. 1674 // It can be set to zero asynchronously (i.e., without a VM operation 1675 // or a lock) so we have to be very careful. 1676 int _interp_only_mode; 1677 1678 public: 1679 // used by the interpreter for fullspeed debugging support (see above) 1680 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1681 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1682 int get_interp_only_mode() { return _interp_only_mode; } 1683 void increment_interp_only_mode() { ++_interp_only_mode; } 1684 void decrement_interp_only_mode() { --_interp_only_mode; } 1685 1686 // support for cached flag that indicates whether exceptions need to be posted for this thread 1687 // if this is false, we can avoid deoptimizing when events are thrown 1688 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1689 private: 1690 int _should_post_on_exceptions_flag; 1691 1692 public: 1693 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1694 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1695 1696 private: 1697 ThreadStatistics _thread_stat; 1698 1699 public: 1700 ThreadStatistics get_thread_stat() const { return _thread_stat; } 1701 1702 // Return a blocker object for which this thread is blocked parking. 1703 oop current_park_blocker(); 1704 1705 private: 1706 static size_t _stack_size_at_create; 1707 1708 public: 1709 static inline size_t stack_size_at_create(void) { 1710 return _stack_size_at_create; 1711 } 1712 static inline void set_stack_size_at_create(size_t value) { 1713 _stack_size_at_create = value; 1714 } 1715 1716 #if INCLUDE_ALL_GCS 1717 // SATB marking queue support 1718 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } 1719 static SATBMarkQueueSet& satb_mark_queue_set() { 1720 return _satb_mark_queue_set; 1721 } 1722 1723 // Dirty card queue support 1724 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } 1725 static DirtyCardQueueSet& dirty_card_queue_set() { 1726 return _dirty_card_queue_set; 1727 } 1728 #endif // INCLUDE_ALL_GCS 1729 1730 // This method initializes the SATB and dirty card queues before a 1731 // JavaThread is added to the Java thread list. Right now, we don't 1732 // have to do anything to the dirty card queue (it should have been 1733 // activated when the thread was created), but we have to activate 1734 // the SATB queue if the thread is created while a marking cycle is 1735 // in progress. The activation / de-activation of the SATB queues at 1736 // the beginning / end of a marking cycle is done during safepoints 1737 // so we have to make sure this method is called outside one to be 1738 // able to safely read the active field of the SATB queue set. Right 1739 // now, it is called just before the thread is added to the Java 1740 // thread list in the Threads::add() method. That method is holding 1741 // the Threads_lock which ensures we are outside a safepoint. We 1742 // cannot do the obvious and set the active field of the SATB queue 1743 // when the thread is created given that, in some cases, safepoints 1744 // might happen between the JavaThread constructor being called and the 1745 // thread being added to the Java thread list (an example of this is 1746 // when the structure for the DestroyJavaVM thread is created). 1747 #if INCLUDE_ALL_GCS 1748 void initialize_queues(); 1749 #else // INCLUDE_ALL_GCS 1750 void initialize_queues() { } 1751 #endif // INCLUDE_ALL_GCS 1752 1753 // Machine dependent stuff 1754 #ifdef TARGET_OS_ARCH_linux_x86 1755 # include "thread_linux_x86.hpp" 1756 #endif 1757 #ifdef TARGET_OS_ARCH_linux_sparc 1758 # include "thread_linux_sparc.hpp" 1759 #endif 1760 #ifdef TARGET_OS_ARCH_linux_zero 1761 # include "thread_linux_zero.hpp" 1762 #endif 1763 #ifdef TARGET_OS_ARCH_solaris_x86 1764 # include "thread_solaris_x86.hpp" 1765 #endif 1766 #ifdef TARGET_OS_ARCH_solaris_sparc 1767 # include "thread_solaris_sparc.hpp" 1768 #endif 1769 #ifdef TARGET_OS_ARCH_windows_x86 1770 # include "thread_windows_x86.hpp" 1771 #endif 1772 #ifdef TARGET_OS_ARCH_linux_arm 1773 # include "thread_linux_arm.hpp" 1774 #endif 1775 #ifdef TARGET_OS_ARCH_linux_ppc 1776 # include "thread_linux_ppc.hpp" 1777 #endif 1778 #ifdef TARGET_OS_ARCH_linux_aarch64 1779 # include "thread_linux_aarch64.hpp" 1780 #endif 1781 #ifdef TARGET_OS_ARCH_aix_ppc 1782 # include "thread_aix_ppc.hpp" 1783 #endif 1784 #ifdef TARGET_OS_ARCH_bsd_x86 1785 # include "thread_bsd_x86.hpp" 1786 #endif 1787 #ifdef TARGET_OS_ARCH_bsd_zero 1788 # include "thread_bsd_zero.hpp" 1789 #endif 1790 1791 1792 public: 1793 void set_blocked_on_compilation(bool value) { 1794 _blocked_on_compilation = value; 1795 } 1796 1797 bool blocked_on_compilation() { 1798 return _blocked_on_compilation; 1799 } 1800 protected: 1801 bool _blocked_on_compilation; 1802 1803 1804 // JSR166 per-thread parker 1805 private: 1806 Parker* _parker; 1807 public: 1808 Parker* parker() { return _parker; } 1809 1810 // Biased locking support 1811 private: 1812 GrowableArray<MonitorInfo*>* _cached_monitor_info; 1813 public: 1814 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 1815 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 1816 1817 // clearing/querying jni attach status 1818 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1819 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1820 inline void set_done_attaching_via_jni(); 1821 private: 1822 // This field is used to determine if a thread has claimed 1823 // a par_id: it is UINT_MAX if the thread has not claimed a par_id; 1824 // otherwise its value is the par_id that has been claimed. 1825 uint _claimed_par_id; 1826 public: 1827 uint get_claimed_par_id() { return _claimed_par_id; } 1828 void set_claimed_par_id(uint id) { _claimed_par_id = id; } 1829 }; 1830 1831 // Inline implementation of JavaThread::current 1832 inline JavaThread* JavaThread::current() { 1833 Thread* thread = ThreadLocalStorage::thread(); 1834 assert(thread != NULL && thread->is_Java_thread(), "just checking"); 1835 return (JavaThread*)thread; 1836 } 1837 1838 inline CompilerThread* JavaThread::as_CompilerThread() { 1839 assert(is_Compiler_thread(), "just checking"); 1840 return (CompilerThread*)this; 1841 } 1842 1843 // Dedicated thread to sweep the code cache 1844 class CodeCacheSweeperThread : public JavaThread { 1845 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper 1846 public: 1847 CodeCacheSweeperThread(); 1848 // Track the nmethod currently being scanned by the sweeper 1849 void set_scanned_nmethod(nmethod* nm) { 1850 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value"); 1851 _scanned_nmethod = nm; 1852 } 1853 1854 // Hide sweeper thread from external view. 1855 bool is_hidden_from_external_view() const { return true; } 1856 1857 bool is_Code_cache_sweeper_thread() const { return true; } 1858 // GC support 1859 // Apply "f->do_oop" to all root oops in "this". 1860 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 1861 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1862 }; 1863 1864 // A thread used for Compilation. 1865 class CompilerThread : public JavaThread { 1866 friend class VMStructs; 1867 private: 1868 CompilerCounters* _counters; 1869 1870 ciEnv* _env; 1871 CompileLog* _log; 1872 CompileTask* _task; 1873 CompileQueue* _queue; 1874 BufferBlob* _buffer_blob; 1875 1876 AbstractCompiler* _compiler; 1877 1878 public: 1879 1880 static CompilerThread* current(); 1881 1882 CompilerThread(CompileQueue* queue, CompilerCounters* counters); 1883 1884 bool is_Compiler_thread() const { return true; } 1885 1886 virtual bool can_call_java() const; 1887 1888 // Hide native compiler threads from external view. 1889 bool is_hidden_from_external_view() const { return !can_call_java(); } 1890 1891 void set_compiler(AbstractCompiler* c) { _compiler = c; } 1892 AbstractCompiler* compiler() const { return _compiler; } 1893 1894 CompileQueue* queue() const { return _queue; } 1895 CompilerCounters* counters() const { return _counters; } 1896 1897 // Get/set the thread's compilation environment. 1898 ciEnv* env() { return _env; } 1899 void set_env(ciEnv* env) { _env = env; } 1900 1901 BufferBlob* get_buffer_blob() const { return _buffer_blob; } 1902 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; } 1903 1904 // Get/set the thread's logging information 1905 CompileLog* log() { return _log; } 1906 void init_log(CompileLog* log) { 1907 // Set once, for good. 1908 assert(_log == NULL, "set only once"); 1909 _log = log; 1910 } 1911 1912 #ifndef PRODUCT 1913 private: 1914 IdealGraphPrinter _ideal_graph_printer; 1915 public: 1916 IdealGraphPrinter ideal_graph_printer() { return _ideal_graph_printer; } 1917 void set_ideal_graph_printer(IdealGraphPrinter n) { _ideal_graph_printer = n; } 1918 #endif 1919 1920 // Get/set the thread's current task 1921 CompileTask task() { return _task; } 1922 void set_task(CompileTask task) { _task = task; } 1923 }; 1924 1925 inline CompilerThread CompilerThread::current() { 1926 return JavaThread::current()->as_CompilerThread(); 1927 } 1928 1929 // The active thread queue. It also keeps track of the current used 1930 // thread priorities. 1931 class Threads: AllStatic { 1932 friend class VMStructs; 1933 private: 1934 static JavaThread* _thread_list; 1935 static int _number_of_threads; 1936 static int _number_of_non_daemon_threads; 1937 static int _return_code; 1938 static int _thread_claim_parity; 1939 #ifdef ASSERT 1940 static bool _vm_complete; 1941 #endif 1942 1943 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS); 1944 static void initialize_jsr292_core_classes(TRAPS); 1945 public: 1946 // Thread management 1947 // force_daemon is a concession to JNI, where we may need to add a 1948 // thread to the thread list before allocating its thread object 1949 static void add(JavaThread* p, bool force_daemon = false); 1950 static void remove(JavaThread* p); 1951 static bool includes(JavaThread* p); 1952 static JavaThread* first() { return _thread_list; } 1953 static void threads_do(ThreadClosure* tc); 1954 1955 // Initializes the vm and creates the vm thread 1956 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 1957 static void convert_vm_init_libraries_to_agents(); 1958 static void create_vm_init_libraries(); 1959 static void create_vm_init_agents(); 1960 static void shutdown_vm_agents(); 1961 static bool destroy_vm(); 1962 // Supported VM versions via JNI 1963 // Includes JNI_VERSION_1_1 1964 static jboolean is_supported_jni_version_including_1_1(jint version); 1965 // Does not include JNI_VERSION_1_1 1966 static jboolean is_supported_jni_version(jint version); 1967 1968 // The "thread claim parity" provides a way for threads to be claimed 1969 // by parallel worker tasks. 1970 // 1971 // Each thread contains a a "parity" field. A task will claim the 1972 // thread only if its parity field is the same as the global parity, 1973 // which is updated by calling change_thread_claim_parity(). 1974 // 1975 // For this to work change_thread_claim_parity() needs to be called 1976 // exactly once in sequential code before starting parallel tasks 1977 // that should claim threads. 1978 // 1979 // New threads get their parity set to 0 and change_thread_claim_parity() 1980 // never set the global parity to 0. 1981 static int thread_claim_parity() { return _thread_claim_parity; } 1982 static void change_thread_claim_parity(); 1983 static void assert_all_threads_claimed() NOT_DEBUG_RETURN; 1984 1985 // Apply "f->do_oop" to all root oops in all threads. 1986 // This version may only be called by sequential code. 1987 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1988 // This version may be called by sequential or parallel code. 1989 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1990 // This creates a list of GCTasks, one per thread. 1991 static void create_thread_roots_tasks(GCTaskQueue* q); 1992 // This creates a list of GCTasks, one per thread, for marking objects. 1993 static void create_thread_roots_marking_tasks(GCTaskQueue* q); 1994 1995 // Apply "f->do_oop" to roots in all threads that 1996 // are part of compiled frames 1997 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); 1998 1999 static void convert_hcode_pointers(); 2000 static void restore_hcode_pointers(); 2001 2002 // Sweeper 2003 static void nmethods_do(CodeBlobClosure* cf); 2004 2005 // RedefineClasses support 2006 static void metadata_do(void f(Metadata*)); 2007 static void metadata_handles_do(void f(Metadata*)); 2008 2009 #ifdef ASSERT 2010 static bool is_vm_complete() { return _vm_complete; } 2011 #endif 2012 2013 // Verification 2014 static void verify(); 2015 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); 2016 static void print(bool print_stacks, bool internal_format) { 2017 // this function is only used by debug.cpp 2018 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed /); 2019 } 2020 static void print_on_error(outputStream st, Thread* current, char* buf, int buflen); 2021 2022 // Get Java threads that are waiting to enter a monitor. If doLock 2023 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2024 // VM needs to be at a safepoint. 2025 static GrowableArray<JavaThread*>* get_pending_threads(int count, 2026 address monitor, bool doLock); 2027 2028 // Get owning Java thread from the monitor's owner field. If doLock 2029 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2030 // VM needs to be at a safepoint. 2031 static JavaThread owning_thread_from_monitor_owner(address owner, 2032 bool doLock); 2033 2034 // Number of threads on the active threads list 2035 static int number_of_threads() { return _number_of_threads; } 2036 // Number of non-daemon threads on the active threads list 2037 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 2038 2039 // Deoptimizes all frames tied to marked nmethods 2040 static void deoptimized_wrt_marked_nmethods(); 2041 2042 static JavaThread find_java_thread_from_java_tid(jlong java_tid); 2043 2044 }; 2045 2046 2047 // Thread iterator 2048 class ThreadClosure: public StackObj { 2049 public: 2050 virtual void do_thread(Thread* thread) = 0; 2051 }; 2052 2053 class SignalHandlerMark: public StackObj { 2054 private: 2055 Thread* _thread; 2056 public: 2057 SignalHandlerMark(Thread* t) { 2058 _thread = t; 2059 if (_thread) _thread->enter_signal_handler(); 2060 } 2061 ~SignalHandlerMark() { 2062 if (_thread) _thread->leave_signal_handler(); 2063 _thread = NULL; 2064 } 2065 }; 2066 2067 2068 #endif // SHARE_VM_RUNTIME_THREAD_HPP