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/satbMarkQueue.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: 105 106 #ifndef USE_LIBRARY_BASED_TLS_ONLY 107 // Current thread is maintained as a thread-local variable 108 static THREAD_LOCAL_DECL Thread* _thr_current; 109 #endif 110 111 // Exception handling 112 // (Note: _pending_exception and friends are in ThreadShadow) 113 //oop _pending_exception; // pending exception for current thread 114 // const char* _exception_file; // file information for exception (debugging only) 115 // int _exception_line; // line information for exception (debugging only) 116 protected: 117 // Support for forcing alignment of thread objects for biased locking 118 void* _real_malloc_address; 119 public: 120 void* operator new(size_t size) throw() { return allocate(size, true); } 121 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 122 return allocate(size, false); } 123 void operator delete(void* p); 124 125 protected: 126 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 127 private: 128 129 // *************************************************************** 130 // Suspend and resume support 131 // *************************************************************** 132 // 133 // VM suspend/resume no longer exists - it was once used for various 134 // things including safepoints but was deprecated and finally removed 135 // in Java 7. Because VM suspension was considered "internal" Java-level 136 // suspension was considered "external", and this legacy naming scheme 137 // remains. 138 // 139 // External suspend/resume requests come from JVM_SuspendThread, 140 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI 141 // ResumeThread. External 142 // suspend requests cause _external_suspend to be set and external 143 // resume requests cause _external_suspend to be cleared. 144 // External suspend requests do not nest on top of other external 145 // suspend requests. The higher level APIs reject suspend requests 146 // for already suspended threads. 147 // 148 // The external_suspend 149 // flag is checked by has_special_runtime_exit_condition() and java thread 150 // will self-suspend when handle_special_runtime_exit_condition() is 151 // called. Most uses of the _thread_blocked state in JavaThreads are 152 // considered the same as being externally suspended; if the blocking 153 // condition lifts, the JavaThread will self-suspend. Other places 154 // where VM checks for external_suspend include: 155 // + mutex granting (do not enter monitors when thread is suspended) 156 // + state transitions from _thread_in_native 157 // 158 // In general, java_suspend() does not wait for an external suspend 159 // request to complete. When it returns, the only guarantee is that 160 // the _external_suspend field is true. 161 // 162 // wait_for_ext_suspend_completion() is used to wait for an external 163 // suspend request to complete. External suspend requests are usually 164 // followed by some other interface call that requires the thread to 165 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into 166 // the interface that requires quiescence, we give the JavaThread a 167 // chance to self-suspend before we need it to be quiescent. This 168 // improves overall suspend/query performance. 169 // 170 // _suspend_flags controls the behavior of java_ suspend/resume. 171 // It must be set under the protection of SR_lock. Read from the flag is 172 // OK without SR_lock as long as the value is only used as a hint. 173 // (e.g., check _external_suspend first without lock and then recheck 174 // inside SR_lock and finish the suspension) 175 // 176 // _suspend_flags is also overloaded for other "special conditions" so 177 // that a single check indicates whether any special action is needed 178 // eg. for async exceptions. 179 // ------------------------------------------------------------------- 180 // Notes: 181 // 1. The suspend/resume logic no longer uses ThreadState in OSThread 182 // but we still update its value to keep other part of the system (mainly 183 // JVMTI) happy. ThreadState is legacy code (see notes in 184 // osThread.hpp). 185 // 186 // 2. It would be more natural if set_external_suspend() is private and 187 // part of java_suspend(), but that probably would affect the suspend/query 188 // performance. Need more investigation on this. 189 190 // suspend/resume lock: used for self-suspend 191 Monitor* _SR_lock; 192 193 protected: 194 enum SuspendFlags { 195 // NOTE: avoid using the sign-bit as cc generates different test code 196 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 197 198 _external_suspend = 0x20000000U, // thread is asked to self suspend 199 _ext_suspended = 0x40000000U, // thread has self-suspended 200 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt 201 202 _has_async_exception = 0x00000001U, // there is a pending async exception 203 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock 204 }; 205 206 // various suspension related flags - atomically updated 207 // overloaded for async exception checking in check_special_condition_for_native_trans. 208 volatile uint32_t _suspend_flags; 209 210 private: 211 int _num_nested_signal; 212 213 DEBUG_ONLY(bool _suspendible_thread;) 214 215 public: 216 void enter_signal_handler() { _num_nested_signal++; } 217 void leave_signal_handler() { _num_nested_signal--; } 218 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } 219 220 #ifdef ASSERT 221 void set_suspendible_thread() { 222 _suspendible_thread = true; 223 } 224 225 void clear_suspendible_thread() { 226 _suspendible_thread = false; 227 } 228 229 bool is_suspendible_thread() { return _suspendible_thread; } 230 #endif 231 232 private: 233 // Active_handles points to a block of handles 234 JNIHandleBlock* _active_handles; 235 236 // One-element thread local free list 237 JNIHandleBlock* _free_handle_block; 238 239 // Point to the last handle mark 240 HandleMark* _last_handle_mark; 241 242 // The parity of the last strong_roots iteration in which this thread was 243 // claimed as a task. 244 jint _oops_do_parity; 245 246 public: 247 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 248 HandleMark* last_handle_mark() const { return _last_handle_mark; } 249 private: 250 251 // debug support for checking if code does allow safepoints or not 252 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on 253 // mutex, or blocking on an object synchronizer (Java locking). 254 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases 255 // If !allow_allocation(), then an assertion failure will happen during allocation 256 // (Hence, !allow_safepoint() => !allow_allocation()). 257 // 258 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. 259 // 260 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen 261 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. 262 263 // Used by SkipGCALot class. 264 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 265 266 friend class No_Alloc_Verifier; 267 friend class No_Safepoint_Verifier; 268 friend class Pause_No_Safepoint_Verifier; 269 friend class GC_locker; 270 271 ThreadLocalAllocBuffer _tlab; // Thread-local eden 272 jlong _allocated_bytes; // Cumulative number of bytes allocated on 273 // the Java heap 274 275 TRACE_DATA _trace_data; // Thread-local data for tracing 276 277 ThreadExt _ext; 278 279 int _vm_operation_started_count; // VM_Operation support 280 int _vm_operation_completed_count; // VM_Operation support 281 282 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread 283 // is waiting to lock 284 bool _current_pending_monitor_is_from_java; // locking is from Java code 285 286 // ObjectMonitor on which this thread called Object.wait() 287 ObjectMonitor* _current_waiting_monitor; 288 289 // Private thread-local objectmonitor list - a simple cache organized as a SLL. 290 public: 291 ObjectMonitor* omFreeList; 292 int omFreeCount; // length of omFreeList 293 int omFreeProvision; // reload chunk size 294 ObjectMonitor* omInUseList; // SLL to track monitors in circulation 295 int omInUseCount; // length of omInUseList 296 297 #ifdef ASSERT 298 private: 299 bool _visited_for_critical_count; 300 301 public: 302 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } 303 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } 304 #endif 305 306 public: 307 enum { 308 is_definitely_current_thread = true 309 }; 310 311 // Constructor 312 Thread(); 313 virtual ~Thread(); 314 315 // Manage Thread::current() 316 void initialize_thread_current(); 317 private: 318 void clear_thread_current(); // needed for detaching JNI threads 319 320 public: 321 // thread entry point 322 virtual void run(); 323 324 // Testers 325 virtual bool is_VM_thread() const { return false; } 326 virtual bool is_Java_thread() const { return false; } 327 virtual bool is_Compiler_thread() const { return false; } 328 virtual bool is_Code_cache_sweeper_thread() const { return false; } 329 virtual bool is_hidden_from_external_view() const { return false; } 330 virtual bool is_jvmti_agent_thread() const { return false; } 331 // True iff the thread can perform GC operations at a safepoint. 332 // Generally will be true only of VM thread and parallel GC WorkGang 333 // threads. 334 virtual bool is_GC_task_thread() const { return false; } 335 virtual bool is_Watcher_thread() const { return false; } 336 virtual bool is_ConcurrentGC_thread() const { return false; } 337 virtual bool is_Named_thread() const { return false; } 338 virtual bool is_Worker_thread() const { return false; } 339 340 // Can this thread make Java upcalls 341 virtual bool can_call_java() const { return false; } 342 343 // Casts 344 virtual WorkerThread* as_Worker_thread() const { return NULL; } 345 346 virtual char* name() const { return (char*)"Unknown thread"; } 347 348 // Returns the current thread (ASSERTS if NULL) 349 static inline Thread* current(); 350 // Returns the current thread, or NULL if not attached 351 static inline Thread* current_or_null(); 352 // Returns the current thread, or NULL if not attached, and is 353 // safe for use from signal-handlers 354 static inline Thread* current_or_null_safe(); 355 356 // Common thread operations 357 static void set_priority(Thread* thread, ThreadPriority priority); 358 static ThreadPriority get_priority(const Thread* const thread); 359 static void start(Thread* thread); 360 static void interrupt(Thread* thr); 361 static bool is_interrupted(Thread* thr, bool clear_interrupted); 362 363 void set_native_thread_name(const char *name) { 364 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); 365 os::set_native_thread_name(name); 366 } 367 368 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } 369 Monitor* SR_lock() const { return _SR_lock; } 370 371 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } 372 373 inline void set_suspend_flag(SuspendFlags f); 374 inline void clear_suspend_flag(SuspendFlags f); 375 376 inline void set_has_async_exception(); 377 inline void clear_has_async_exception(); 378 379 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } 380 381 inline void set_critical_native_unlock(); 382 inline void clear_critical_native_unlock(); 383 384 // Support for Unhandled Oop detection 385 // Add the field for both, fastdebug and debug, builds to keep 386 // Thread's fields layout the same. 387 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build. 388 #ifdef CHECK_UNHANDLED_OOPS 389 private: 390 UnhandledOops* _unhandled_oops; 391 #elif defined(ASSERT) 392 private: 393 void* _unhandled_oops; 394 #endif 395 #ifdef CHECK_UNHANDLED_OOPS 396 public: 397 UnhandledOops* unhandled_oops() { return _unhandled_oops; } 398 // Mark oop safe for gc. It may be stack allocated but won't move. 399 void allow_unhandled_oop(oop *op) { 400 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); 401 } 402 // Clear oops at safepoint so crashes point to unhandled oop violator 403 void clear_unhandled_oops() { 404 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); 405 } 406 #endif // CHECK_UNHANDLED_OOPS 407 408 public: 409 #ifndef PRODUCT 410 bool skip_gcalot() { return _skip_gcalot; } 411 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 412 #endif 413 414 // Installs a pending exception to be inserted later 415 static void send_async_exception(oop thread_oop, oop java_throwable); 416 417 // Resource area 418 ResourceArea* resource_area() const { return _resource_area; } 419 void set_resource_area(ResourceArea* area) { _resource_area = area; } 420 421 OSThread* osthread() const { return _osthread; } 422 void set_osthread(OSThread* thread) { _osthread = thread; } 423 424 // JNI handle support 425 JNIHandleBlock* active_handles() const { return _active_handles; } 426 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 427 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 428 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 429 430 // Internal handle support 431 HandleArea* handle_area() const { return _handle_area; } 432 void set_handle_area(HandleArea* area) { _handle_area = area; } 433 434 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 435 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 436 437 // Thread-Local Allocation Buffer (TLAB) support 438 ThreadLocalAllocBuffer& tlab() { return _tlab; } 439 void initialize_tlab() { 440 if (UseTLAB) { 441 tlab().initialize(); 442 } 443 } 444 445 jlong allocated_bytes() { return _allocated_bytes; } 446 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 447 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 448 inline jlong cooked_allocated_bytes(); 449 450 TRACE_DATA* trace_data() { return &_trace_data; } 451 452 const ThreadExt& ext() const { return _ext; } 453 ThreadExt& ext() { return _ext; } 454 455 // VM operation support 456 int vm_operation_ticket() { return ++_vm_operation_started_count; } 457 int vm_operation_completed_count() { return _vm_operation_completed_count; } 458 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } 459 460 // For tracking the heavyweight monitor the thread is pending on. 461 ObjectMonitor* current_pending_monitor() { 462 return _current_pending_monitor; 463 } 464 void set_current_pending_monitor(ObjectMonitor* monitor) { 465 _current_pending_monitor = monitor; 466 } 467 void set_current_pending_monitor_is_from_java(bool from_java) { 468 _current_pending_monitor_is_from_java = from_java; 469 } 470 bool current_pending_monitor_is_from_java() { 471 return _current_pending_monitor_is_from_java; 472 } 473 474 // For tracking the ObjectMonitor on which this thread called Object.wait() 475 ObjectMonitor* current_waiting_monitor() { 476 return _current_waiting_monitor; 477 } 478 void set_current_waiting_monitor(ObjectMonitor* monitor) { 479 _current_waiting_monitor = monitor; 480 } 481 482 // GC support 483 // Apply "f->do_oop" to all root oops in "this". 484 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive. 485 // Used by JavaThread::oops_do. 486 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 487 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 488 489 // Handles the parallel case for the method below. 490 private: 491 bool claim_oops_do_par_case(int collection_parity); 492 public: 493 // Requires that "collection_parity" is that of the current roots 494 // iteration. If "is_par" is false, sets the parity of "this" to 495 // "collection_parity", and returns "true". If "is_par" is true, 496 // uses an atomic instruction to set the current threads parity to 497 // "collection_parity", if it is not already. Returns "true" iff the 498 // calling thread does the update, this indicates that the calling thread 499 // has claimed the thread's stack as a root groop in the current 500 // collection. 501 bool claim_oops_do(bool is_par, int collection_parity) { 502 if (!is_par) { 503 _oops_do_parity = collection_parity; 504 return true; 505 } else { 506 return claim_oops_do_par_case(collection_parity); 507 } 508 } 509 510 // Sweeper support 511 void nmethods_do(CodeBlobClosure* cf); 512 513 // jvmtiRedefineClasses support 514 void metadata_handles_do(void f(Metadata*)); 515 516 // Used by fast lock support 517 virtual bool is_lock_owned(address adr) const; 518 519 // Check if address is in the stack of the thread (not just for locks). 520 // Warning: the method can only be used on the running thread 521 bool is_in_stack(address adr) const; 522 // Check if address is in the usable part of the stack (excludes protected 523 // guard pages) 524 bool is_in_usable_stack(address adr) const; 525 526 // Sets this thread as starting thread. Returns failure if thread 527 // creation fails due to lack of memory, too many threads etc. 528 bool set_as_starting_thread(); 529 530 protected: 531 // OS data associated with the thread 532 OSThread* _osthread; // Platform-specific thread information 533 534 // Thread local resource area for temporary allocation within the VM 535 ResourceArea* _resource_area; 536 537 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 538 539 // Thread local handle area for allocation of handles within the VM 540 HandleArea* _handle_area; 541 GrowableArray<Metadata*>* _metadata_handles; 542 543 // Support for stack overflow handling, get_thread, etc. 544 address _stack_base; 545 size_t _stack_size; 546 uintptr_t _self_raw_id; // used by get_thread (mutable) 547 int _lgrp_id; 548 549 public: 550 // Stack overflow support 551 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 552 553 void set_stack_base(address base) { _stack_base = base; } 554 size_t stack_size() const { return _stack_size; } 555 void set_stack_size(size_t size) { _stack_size = size; } 556 void record_stack_base_and_size(); 557 558 bool on_local_stack(address adr) const { 559 // QQQ this has knowledge of direction, ought to be a stack method 560 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); 561 } 562 563 uintptr_t self_raw_id() { return _self_raw_id; } 564 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } 565 566 int lgrp_id() const { return _lgrp_id; } 567 void set_lgrp_id(int value) { _lgrp_id = value; } 568 569 // Printing 570 virtual void print_on(outputStream* st) const; 571 void print() const { print_on(tty); } 572 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 573 574 // Debug-only code 575 #ifdef ASSERT 576 private: 577 // Deadlock detection support for Mutex locks. List of locks own by thread. 578 Monitor* _owned_locks; 579 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 580 // thus the friendship 581 friend class Mutex; 582 friend class Monitor; 583 584 public: 585 void print_owned_locks_on(outputStream* st) const; 586 void print_owned_locks() const { print_owned_locks_on(tty); } 587 Monitor* owned_locks() const { return _owned_locks; } 588 bool owns_locks() const { return owned_locks() != NULL; } 589 bool owns_locks_but_compiled_lock() const; 590 int oops_do_parity() const { return _oops_do_parity; } 591 592 // Deadlock detection 593 bool allow_allocation() { return _allow_allocation_count == 0; } 594 ResourceMark* current_resource_mark() { return _current_resource_mark; } 595 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 596 #endif 597 598 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; 599 600 private: 601 volatile int _jvmti_env_iteration_count; 602 603 public: 604 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 605 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 606 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 607 608 // Code generation 609 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); } 610 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); } 611 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); } 612 613 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); } 614 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); } 615 616 #define TLAB_FIELD_OFFSET(name) \ 617 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } 618 619 TLAB_FIELD_OFFSET(start) 620 TLAB_FIELD_OFFSET(end) 621 TLAB_FIELD_OFFSET(top) 622 TLAB_FIELD_OFFSET(pf_top) 623 TLAB_FIELD_OFFSET(size) // desired_size 624 TLAB_FIELD_OFFSET(refill_waste_limit) 625 TLAB_FIELD_OFFSET(number_of_refills) 626 TLAB_FIELD_OFFSET(fast_refill_waste) 627 TLAB_FIELD_OFFSET(slow_allocations) 628 629 #undef TLAB_FIELD_OFFSET 630 631 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); } 632 633 public: 634 volatile intptr_t _Stalled; 635 volatile int _TypeTag; 636 ParkEvent * _ParkEvent; // for synchronized() 637 ParkEvent * _SleepEvent; // for Thread.sleep 638 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor 639 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease 640 int NativeSyncRecursion; // diagnostic 641 642 volatile int _OnTrap; // Resume-at IP delta 643 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG 644 jint _hashStateX; // thread-specific hashCode generator state 645 jint _hashStateY; 646 jint _hashStateZ; 647 void * _schedctl; 648 649 650 volatile jint rng[4]; // RNG for spin loop 651 652 // Low-level leaf-lock primitives used to implement synchronization 653 // and native monitor-mutex infrastructure. 654 // Not for general synchronization use. 655 static void SpinAcquire(volatile int * Lock, const char * Name); 656 static void SpinRelease(volatile int * Lock); 657 static void muxAcquire(volatile intptr_t * Lock, const char * Name); 658 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev); 659 static void muxRelease(volatile intptr_t * Lock); 660 }; 661 662 // Inline implementation of Thread::current() 663 inline Thread* Thread::current() { 664 Thread* current = current_or_null(); 665 assert(current != NULL, "Thread::current() called on detached thread"); 666 return current; 667 } 668 669 inline Thread* Thread::current_or_null() { 670 #ifndef USE_LIBRARY_BASED_TLS_ONLY 671 return _thr_current; 672 #else 673 return ThreadLocalStorage::thread(); 674 #endif 675 } 676 677 inline Thread* Thread::current_or_null_safe() { 678 return ThreadLocalStorage::thread(); 679 } 680 681 // Name support for threads. non-JavaThread subclasses with multiple 682 // uniquely named instances should derive from this. 683 class NamedThread: public Thread { 684 friend class VMStructs; 685 enum { 686 max_name_len = 64 687 }; 688 private: 689 char* _name; 690 // log JavaThread being processed by oops_do 691 JavaThread* _processed_thread; 692 uint _gc_id; // The current GC id when a thread takes part in GC 693 694 public: 695 NamedThread(); 696 ~NamedThread(); 697 // May only be called once per thread. 698 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); 699 void initialize_named_thread(); 700 virtual bool is_Named_thread() const { return true; } 701 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } 702 JavaThread *processed_thread() { return _processed_thread; } 703 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } 704 virtual void print_on(outputStream* st) const; 705 706 void set_gc_id(uint gc_id) { _gc_id = gc_id; } 707 uint gc_id() { return _gc_id; } 708 }; 709 710 // Worker threads are named and have an id of an assigned work. 711 class WorkerThread: public NamedThread { 712 private: 713 uint _id; 714 public: 715 WorkerThread() : _id(0) { } 716 virtual bool is_Worker_thread() const { return true; } 717 718 virtual WorkerThread* as_Worker_thread() const { 719 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); 720 return (WorkerThread*) this; 721 } 722 723 void set_id(uint work_id) { _id = work_id; } 724 uint id() const { return _id; } 725 }; 726 727 // A single WatcherThread is used for simulating timer interrupts. 728 class WatcherThread: public Thread { 729 friend class VMStructs; 730 public: 731 virtual void run(); 732 733 private: 734 static WatcherThread* _watcher_thread; 735 736 static bool _startable; 737 // volatile due to at least one lock-free read 738 volatile static bool _should_terminate; 739 740 os::WatcherThreadCrashProtection* _crash_protection; 741 public: 742 enum SomeConstants { 743 delay_interval = 10 // interrupt delay in milliseconds 744 }; 745 746 // Constructor 747 WatcherThread(); 748 749 // Tester 750 bool is_Watcher_thread() const { return true; } 751 752 // Printing 753 char* name() const { return (char*)"VM Periodic Task Thread"; } 754 void print_on(outputStream* st) const; 755 void unpark(); 756 757 // Returns the single instance of WatcherThread 758 static WatcherThread* watcher_thread() { return _watcher_thread; } 759 760 // Create and start the single instance of WatcherThread, or stop it on shutdown 761 static void start(); 762 static void stop(); 763 // Only allow start once the VM is sufficiently initialized 764 // Otherwise the first task to enroll will trigger the start 765 static void make_startable(); 766 767 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) { 768 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread"); 769 _crash_protection = crash_protection; 770 } 771 772 bool has_crash_protection() const { return _crash_protection != NULL; } 773 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; } 774 775 private: 776 int sleep() const; 777 }; 778 779 780 class CompilerThread; 781 782 typedef void (*ThreadFunction)(JavaThread*, TRAPS); 783 784 class JavaThread: public Thread { 785 friend class VMStructs; 786 friend class WhiteBox; 787 private: 788 JavaThread* _next; // The next thread in the Threads list 789 oop _threadObj; // The Java level thread object 790 791 #ifdef ASSERT 792 private: 793 int _java_call_counter; 794 795 public: 796 int java_call_counter() { return _java_call_counter; } 797 void inc_java_call_counter() { _java_call_counter++; } 798 void dec_java_call_counter() { 799 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 800 _java_call_counter--; 801 } 802 private: // restore original namespace restriction 803 #endif // ifdef ASSERT 804 805 #ifndef PRODUCT 806 public: 807 enum { 808 jump_ring_buffer_size = 16 809 }; 810 private: // restore original namespace restriction 811 #endif 812 813 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 814 815 ThreadFunction _entry_point; 816 817 JNIEnv _jni_environment; 818 819 // Deopt support 820 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 821 822 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we 823 // transition out of native 824 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized 825 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 826 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 827 // Because deoptimization is lazy we must save jvmti requests to set locals 828 // in compiled frames until we deoptimize and we have an interpreter frame. 829 // This holds the pointer to array (yeah like there might be more than one) of 830 // description of compiled vframes that have locals that need to be updated. 831 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; 832 833 // Handshake value for fixing 6243940. We need a place for the i2c 834 // adapter to store the callee Method*. This value is NEVER live 835 // across a gc point so it does NOT have to be gc'd 836 // The handshake is open ended since we can't be certain that it will 837 // be NULLed. This is because we rarely ever see the race and end up 838 // in handle_wrong_method which is the backend of the handshake. See 839 // code in i2c adapters and handle_wrong_method. 840 841 Method* _callee_target; 842 843 // Used to pass back results to the interpreter or generated code running Java code. 844 oop _vm_result; // oop result is GC-preserved 845 Metadata* _vm_result_2; // non-oop result 846 847 // See ReduceInitialCardMarks: this holds the precise space interval of 848 // the most recent slow path allocation for which compiled code has 849 // elided card-marks for performance along the fast-path. 850 MemRegion _deferred_card_mark; 851 852 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 853 // allocated during deoptimization 854 // and by JNI_MonitorEnter/Exit 855 856 // Async. requests support 857 enum AsyncRequests { 858 _no_async_condition = 0, 859 _async_exception, 860 _async_unsafe_access_error 861 }; 862 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request 863 oop _pending_async_exception; 864 865 // Safepoint support 866 public: // Expose _thread_state for SafeFetchInt() 867 volatile JavaThreadState _thread_state; 868 private: 869 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint 870 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 871 872 // JavaThread termination support 873 enum TerminatedTypes { 874 _not_terminated = 0xDEAD - 2, 875 _thread_exiting, // JavaThread::exit() has been called for this thread 876 _thread_terminated, // JavaThread is removed from thread list 877 _vm_exited // JavaThread is still executing native code, but VM is terminated 878 // only VM_Exit can set _vm_exited 879 }; 880 881 // In general a JavaThread's _terminated field transitions as follows: 882 // 883 // _not_terminated => _thread_exiting => _thread_terminated 884 // 885 // _vm_exited is a special value to cover the case of a JavaThread 886 // executing native code after the VM itself is terminated. 887 volatile TerminatedTypes _terminated; 888 // suspend/resume support 889 volatile bool _suspend_equivalent; // Suspend equivalent condition 890 jint _in_deopt_handler; // count of deoptimization 891 // handlers thread is in 892 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 893 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 894 // never locked) when throwing an exception. Used by interpreter only. 895 896 // JNI attach states: 897 enum JNIAttachStates { 898 _not_attaching_via_jni = 1, // thread is not attaching via JNI 899 _attaching_via_jni, // thread is attaching via JNI 900 _attached_via_jni // thread has attached via JNI 901 }; 902 903 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 904 // A native thread that is attaching via JNI starts with a value 905 // of _attaching_via_jni and transitions to _attached_via_jni. 906 volatile JNIAttachStates _jni_attach_state; 907 908 public: 909 // State of the stack guard pages for this thread. 910 enum StackGuardState { 911 stack_guard_unused, // not needed 912 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow 913 stack_guard_enabled // enabled 914 }; 915 916 private: 917 918 #if INCLUDE_JVMCI 919 // The _pending_* fields below are used to communicate extra information 920 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. 921 922 // Communicates the DeoptReason and DeoptAction of the uncommon trap 923 int _pending_deoptimization; 924 925 // Specifies whether the uncommon trap is to bci 0 of a synchronized method 926 // before the monitor has been acquired. 927 bool _pending_monitorenter; 928 929 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter 930 bool _pending_transfer_to_interpreter; 931 932 // An object that JVMCI compiled code can use to further describe and 933 // uniquely identify the speculative optimization guarded by the uncommon trap 934 oop _pending_failed_speculation; 935 936 // These fields are mutually exclusive in terms of live ranges. 937 union { 938 // Communicates the pc at which the most recent implicit exception occurred 939 // from the signal handler to a deoptimization stub. 940 address _implicit_exception_pc; 941 942 // Communicates an alternative call target to an i2c stub from a JavaCall . 943 address _alternate_call_target; 944 } _jvmci; 945 946 // Support for high precision, thread sensitive counters in JVMCI compiled code. 947 jlong* _jvmci_counters; 948 949 public: 950 static jlong* _jvmci_old_thread_counters; 951 static void collect_counters(typeArrayOop array); 952 private: 953 #endif // INCLUDE_JVMCI 954 955 StackGuardState _stack_guard_state; 956 957 // Precompute the limit of the stack as used in stack overflow checks. 958 // We load it from here to simplify the stack overflow check in assembly. 959 address _stack_overflow_limit; 960 961 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 962 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 963 // code) 964 volatile oop _exception_oop; // Exception thrown in compiled code 965 volatile address _exception_pc; // PC where exception happened 966 volatile address _exception_handler_pc; // PC for handler of exception 967 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 968 969 private: 970 // support for JNI critical regions 971 jint _jni_active_critical; // count of entries into JNI critical region 972 973 // Checked JNI: function name requires exception check 974 char* _pending_jni_exception_check_fn; 975 976 // For deadlock detection. 977 int _depth_first_number; 978 979 // JVMTI PopFrame support 980 // This is set to popframe_pending to signal that top Java frame should be popped immediately 981 int _popframe_condition; 982 983 // If reallocation of scalar replaced objects fails, we throw OOM 984 // and during exception propagation, pop the top 985 // _frames_to_pop_failed_realloc frames, the ones that reference 986 // failed reallocations. 987 int _frames_to_pop_failed_realloc; 988 989 #ifndef PRODUCT 990 int _jmp_ring_index; 991 struct { 992 // We use intptr_t instead of address so debugger doesn't try and display strings 993 intptr_t _target; 994 intptr_t _instruction; 995 const char* _file; 996 int _line; 997 } _jmp_ring[jump_ring_buffer_size]; 998 #endif // PRODUCT 999 1000 #if INCLUDE_ALL_GCS 1001 // Support for G1 barriers 1002 1003 SATBMarkQueue _satb_mark_queue; // Thread-local log for SATB barrier. 1004 // Set of all such queues. 1005 static SATBMarkQueueSet _satb_mark_queue_set; 1006 1007 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. 1008 // Set of all such queues. 1009 static DirtyCardQueueSet _dirty_card_queue_set; 1010 1011 void flush_barrier_queues(); 1012 #endif // INCLUDE_ALL_GCS 1013 1014 friend class VMThread; 1015 friend class ThreadWaitTransition; 1016 friend class VM_Exit; 1017 1018 void initialize(); // Initialized the instance variables 1019 1020 public: 1021 // Constructor 1022 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads 1023 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 1024 ~JavaThread(); 1025 1026 #ifdef ASSERT 1027 // verify this JavaThread hasn't be published in the Threads::list yet 1028 void verify_not_published(); 1029 #endif 1030 1031 //JNI functiontable getter/setter for JVMTI jni function table interception API. 1032 void set_jni_functions(struct JNINativeInterface_* functionTable) { 1033 _jni_environment.functions = functionTable; 1034 } 1035 struct JNINativeInterface_* get_jni_functions() { 1036 return (struct JNINativeInterface_ *)_jni_environment.functions; 1037 } 1038 1039 // This function is called at thread creation to allow 1040 // platform specific thread variables to be initialized. 1041 void cache_global_variables(); 1042 1043 // Executes Shutdown.shutdown() 1044 void invoke_shutdown_hooks(); 1045 1046 // Cleanup on thread exit 1047 enum ExitType { 1048 normal_exit, 1049 jni_detach 1050 }; 1051 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 1052 1053 void cleanup_failed_attach_current_thread(); 1054 1055 // Testers 1056 virtual bool is_Java_thread() const { return true; } 1057 virtual bool can_call_java() const { return true; } 1058 1059 // Thread chain operations 1060 JavaThread* next() const { return _next; } 1061 void set_next(JavaThread* p) { _next = p; } 1062 1063 // Thread oop. threadObj() can be NULL for initial JavaThread 1064 // (or for threads attached via JNI) 1065 oop threadObj() const { return _threadObj; } 1066 void set_threadObj(oop p) { _threadObj = p; } 1067 1068 ThreadPriority java_priority() const; // Read from threadObj() 1069 1070 // Prepare thread and add to priority queue. If a priority is 1071 // not specified, use the priority of the thread object. Threads_lock 1072 // must be held while this function is called. 1073 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 1074 void prepare_ext(); 1075 1076 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 1077 address saved_exception_pc() { return _saved_exception_pc; } 1078 1079 1080 ThreadFunction entry_point() const { return _entry_point; } 1081 1082 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1083 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS); 1084 1085 // Last frame anchor routines 1086 1087 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1088 1089 // last_Java_sp 1090 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1091 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1092 1093 // last_Java_pc 1094 1095 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1096 1097 // Safepoint support 1098 #if !(defined(PPC64) || defined(AARCH64)) 1099 JavaThreadState thread_state() const { return _thread_state; } 1100 void set_thread_state(JavaThreadState s) { _thread_state = s; } 1101 #else 1102 // Use membars when accessing volatile _thread_state. See 1103 // Threads::create_vm() for size checks. 1104 inline JavaThreadState thread_state() const; 1105 inline void set_thread_state(JavaThreadState s); 1106 #endif 1107 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } 1108 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } 1109 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } 1110 1111 // thread has called JavaThread::exit() or is terminated 1112 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } 1113 // thread is terminated (no longer on the threads list); we compare 1114 // against the two non-terminated values so that a freed JavaThread 1115 // will also be considered terminated. 1116 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } 1117 void set_terminated(TerminatedTypes t) { _terminated = t; } 1118 // special for Threads::remove() which is static: 1119 void set_terminated_value() { _terminated = _thread_terminated; } 1120 void block_if_vm_exited(); 1121 1122 bool doing_unsafe_access() { return _doing_unsafe_access; } 1123 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1124 1125 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1126 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1127 1128 // Suspend/resume support for JavaThread 1129 private: 1130 inline void set_ext_suspended(); 1131 inline void clear_ext_suspended(); 1132 1133 public: 1134 void java_suspend(); 1135 void java_resume(); 1136 int java_suspend_self(); 1137 1138 void check_and_wait_while_suspended() { 1139 assert(JavaThread::current() == this, "sanity check"); 1140 1141 bool do_self_suspend; 1142 do { 1143 // were we externally suspended while we were waiting? 1144 do_self_suspend = handle_special_suspend_equivalent_condition(); 1145 if (do_self_suspend) { 1146 // don't surprise the thread that suspended us by returning 1147 java_suspend_self(); 1148 set_suspend_equivalent(); 1149 } 1150 } while (do_self_suspend); 1151 } 1152 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); 1153 // Check for async exception in addition to safepoint and suspend request. 1154 static void check_special_condition_for_native_trans(JavaThread *thread); 1155 1156 // Same as check_special_condition_for_native_trans but finishes the 1157 // transition into thread_in_Java mode so that it can potentially 1158 // block. 1159 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); 1160 1161 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); 1162 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { 1163 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1164 // Warning: is_ext_suspend_completed() may temporarily drop the 1165 // SR_lock to allow the thread to reach a stable thread state if 1166 // it is currently in a transient thread state. 1167 return is_ext_suspend_completed(false /* !called_by_wait */, 1168 SuspendRetryDelay, bits); 1169 } 1170 1171 // We cannot allow wait_for_ext_suspend_completion() to run forever or 1172 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally 1173 // passed as the count and delay parameters. Experiments with specific 1174 // calls to wait_for_ext_suspend_completion() can be done by passing 1175 // other values in the code. Experiments with all calls can be done 1176 // via the appropriate -XX options. 1177 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); 1178 1179 inline void set_external_suspend(); 1180 inline void clear_external_suspend(); 1181 1182 inline void set_deopt_suspend(); 1183 inline void clear_deopt_suspend(); 1184 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } 1185 1186 bool is_external_suspend() const { 1187 return (_suspend_flags & _external_suspend) != 0; 1188 } 1189 // Whenever a thread transitions from native to vm/java it must suspend 1190 // if external|deopt suspend is present. 1191 bool is_suspend_after_native() const { 1192 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0; 1193 } 1194 1195 // external suspend request is completed 1196 bool is_ext_suspended() const { 1197 return (_suspend_flags & _ext_suspended) != 0; 1198 } 1199 1200 bool is_external_suspend_with_lock() const { 1201 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1202 return is_external_suspend(); 1203 } 1204 1205 // Special method to handle a pending external suspend request 1206 // when a suspend equivalent condition lifts. 1207 bool handle_special_suspend_equivalent_condition() { 1208 assert(is_suspend_equivalent(), 1209 "should only be called in a suspend equivalence condition"); 1210 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1211 bool ret = is_external_suspend(); 1212 if (!ret) { 1213 // not about to self-suspend so clear suspend equivalence 1214 clear_suspend_equivalent(); 1215 } 1216 // implied else: 1217 // We have a pending external suspend request so we leave the 1218 // suspend_equivalent flag set until java_suspend_self() sets 1219 // the ext_suspended flag and clears the suspend_equivalent 1220 // flag. This insures that wait_for_ext_suspend_completion() 1221 // will return consistent values. 1222 return ret; 1223 } 1224 1225 // utility methods to see if we are doing some kind of suspension 1226 bool is_being_ext_suspended() const { 1227 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1228 return is_ext_suspended() || is_external_suspend(); 1229 } 1230 1231 bool is_suspend_equivalent() const { return _suspend_equivalent; } 1232 1233 void set_suspend_equivalent() { _suspend_equivalent = true; } 1234 void clear_suspend_equivalent() { _suspend_equivalent = false; } 1235 1236 // Thread.stop support 1237 void send_thread_stop(oop throwable); 1238 AsyncRequests clear_special_runtime_exit_condition() { 1239 AsyncRequests x = _special_runtime_exit_condition; 1240 _special_runtime_exit_condition = _no_async_condition; 1241 return x; 1242 } 1243 1244 // Are any async conditions present? 1245 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } 1246 1247 void check_and_handle_async_exceptions(bool check_unsafe_error = true); 1248 1249 // these next two are also used for self-suspension and async exception support 1250 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1251 1252 // Return true if JavaThread has an asynchronous condition or 1253 // if external suspension is requested. 1254 bool has_special_runtime_exit_condition() { 1255 // We call is_external_suspend() last since external suspend should 1256 // be less common. Because we don't use is_external_suspend_with_lock 1257 // it is possible that we won't see an asynchronous external suspend 1258 // request that has just gotten started, i.e., SR_lock grabbed but 1259 // _external_suspend field change either not made yet or not visible 1260 // yet. However, this is okay because the request is asynchronous and 1261 // we will see the new flag value the next time through. It's also 1262 // possible that the external suspend request is dropped after 1263 // we have checked is_external_suspend(), we will recheck its value 1264 // under SR_lock in java_suspend_self(). 1265 return (_special_runtime_exit_condition != _no_async_condition) || 1266 is_external_suspend() || is_deopt_suspend(); 1267 } 1268 1269 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } 1270 1271 inline void set_pending_async_exception(oop e); 1272 1273 // Fast-locking support 1274 bool is_lock_owned(address adr) const; 1275 1276 // Accessors for vframe array top 1277 // The linked list of vframe arrays are sorted on sp. This means when we 1278 // unpack the head must contain the vframe array to unpack. 1279 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1280 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1281 1282 // Side structure for deferring update of java frame locals until deopt occurs 1283 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } 1284 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } 1285 1286 // These only really exist to make debugging deopt problems simpler 1287 1288 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1289 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1290 1291 // The special resourceMark used during deoptimization 1292 1293 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1294 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1295 1296 intptr_t* must_deopt_id() { return _must_deopt_id; } 1297 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } 1298 void clear_must_deopt_id() { _must_deopt_id = NULL; } 1299 1300 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } 1301 nmethod* deopt_nmethod() { return _deopt_nmethod; } 1302 1303 Method* callee_target() const { return _callee_target; } 1304 void set_callee_target (Method* x) { _callee_target = x; } 1305 1306 // Oop results of vm runtime calls 1307 oop vm_result() const { return _vm_result; } 1308 void set_vm_result (oop x) { _vm_result = x; } 1309 1310 Metadata* vm_result_2() const { return _vm_result_2; } 1311 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1312 1313 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1314 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1315 1316 #if INCLUDE_JVMCI 1317 int pending_deoptimization() const { return _pending_deoptimization; } 1318 oop pending_failed_speculation() const { return _pending_failed_speculation; } 1319 bool has_pending_monitorenter() const { return _pending_monitorenter; } 1320 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } 1321 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } 1322 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; } 1323 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } 1324 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; } 1325 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; } 1326 #endif // INCLUDE_JVMCI 1327 1328 // Exception handling for compiled methods 1329 oop exception_oop() const { return _exception_oop; } 1330 address exception_pc() const { return _exception_pc; } 1331 address exception_handler_pc() const { return _exception_handler_pc; } 1332 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1333 1334 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); } 1335 void set_exception_pc(address a) { _exception_pc = a; } 1336 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1337 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1338 1339 void clear_exception_oop_and_pc() { 1340 set_exception_oop(NULL); 1341 set_exception_pc(NULL); 1342 } 1343 1344 // Stack overflow support 1345 inline size_t stack_available(address cur_sp); 1346 address stack_yellow_zone_base() { 1347 return (address)(stack_base() - 1348 (stack_size() - 1349 (stack_red_zone_size() + stack_yellow_zone_size()))); 1350 } 1351 size_t stack_yellow_zone_size() { 1352 return StackYellowPages * os::vm_page_size(); 1353 } 1354 address stack_red_zone_base() { 1355 return (address)(stack_base() - (stack_size() - stack_red_zone_size())); 1356 } 1357 size_t stack_red_zone_size() { return StackRedPages * os::vm_page_size(); } 1358 bool in_stack_yellow_zone(address a) { 1359 return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); 1360 } 1361 bool in_stack_red_zone(address a) { 1362 return (a <= stack_red_zone_base()) && 1363 (a >= (address)((intptr_t)stack_base() - stack_size())); 1364 } 1365 1366 void create_stack_guard_pages(); 1367 void remove_stack_guard_pages(); 1368 1369 void enable_stack_yellow_zone(); 1370 void disable_stack_yellow_zone(); 1371 void enable_stack_red_zone(); 1372 void disable_stack_red_zone(); 1373 1374 inline bool stack_guard_zone_unused(); 1375 inline bool stack_yellow_zone_disabled(); 1376 inline bool stack_yellow_zone_enabled(); 1377 1378 // Attempt to reguard the stack after a stack overflow may have occurred. 1379 // Returns true if (a) guard pages are not needed on this thread, (b) the 1380 // pages are already guarded, or (c) the pages were successfully reguarded. 1381 // Returns false if there is not enough stack space to reguard the pages, in 1382 // which case the caller should unwind a frame and try again. The argument 1383 // should be the caller's (approximate) sp. 1384 bool reguard_stack(address cur_sp); 1385 // Similar to above but see if current stackpoint is out of the guard area 1386 // and reguard if possible. 1387 bool reguard_stack(void); 1388 1389 address stack_overflow_limit() { return _stack_overflow_limit; } 1390 void set_stack_overflow_limit() { 1391 _stack_overflow_limit = _stack_base - _stack_size + 1392 ((StackShadowPages + 1393 StackYellowPages + 1394 StackRedPages) * os::vm_page_size()); 1395 } 1396 1397 // Misc. accessors/mutators 1398 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1399 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1400 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1401 1402 #ifndef PRODUCT 1403 void record_jump(address target, address instr, const char* file, int line); 1404 #endif // PRODUCT 1405 1406 // For assembly stub generation 1407 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } 1408 #ifndef PRODUCT 1409 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); } 1410 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); } 1411 #endif // PRODUCT 1412 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } 1413 static ByteSize last_Java_sp_offset() { 1414 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1415 } 1416 static ByteSize last_Java_pc_offset() { 1417 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1418 } 1419 static ByteSize frame_anchor_offset() { 1420 return byte_offset_of(JavaThread, _anchor); 1421 } 1422 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } 1423 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } 1424 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } 1425 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } 1426 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } 1427 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } 1428 #if INCLUDE_JVMCI 1429 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); } 1430 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); } 1431 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); } 1432 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); } 1433 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); } 1434 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); } 1435 #endif // INCLUDE_JVMCI 1436 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } 1437 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } 1438 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1439 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } 1440 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1441 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); } 1442 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } 1443 1444 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1445 static ByteSize should_post_on_exceptions_flag_offset() { 1446 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1447 } 1448 1449 #if INCLUDE_ALL_GCS 1450 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } 1451 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } 1452 #endif // INCLUDE_ALL_GCS 1453 1454 // Returns the jni environment for this thread 1455 JNIEnv* jni_environment() { return &_jni_environment; } 1456 1457 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1458 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1459 // Only return NULL if thread is off the thread list; starting to 1460 // exit should not return NULL. 1461 if (thread_from_jni_env->is_terminated()) { 1462 thread_from_jni_env->block_if_vm_exited(); 1463 return NULL; 1464 } else { 1465 return thread_from_jni_env; 1466 } 1467 } 1468 1469 // JNI critical regions. These can nest. 1470 bool in_critical() { return _jni_active_critical > 0; } 1471 bool in_last_critical() { return _jni_active_critical == 1; } 1472 void enter_critical() { 1473 assert(Thread::current() == this || 1474 (Thread::current()->is_VM_thread() && 1475 SafepointSynchronize::is_synchronizing()), 1476 "this must be current thread or synchronizing"); 1477 _jni_active_critical++; 1478 } 1479 void exit_critical() { 1480 assert(Thread::current() == this, "this must be current thread"); 1481 _jni_active_critical--; 1482 assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); 1483 } 1484 1485 // Checked JNI, is the programmer required to check for exceptions, specify which function name 1486 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1487 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1488 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1489 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1490 1491 // For deadlock detection 1492 int depth_first_number() { return _depth_first_number; } 1493 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1494 1495 private: 1496 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1497 1498 public: 1499 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1500 void add_monitor_chunk(MonitorChunk* chunk); 1501 void remove_monitor_chunk(MonitorChunk* chunk); 1502 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1503 void inc_in_deopt_handler() { _in_deopt_handler++; } 1504 void dec_in_deopt_handler() { 1505 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1506 if (_in_deopt_handler > 0) { // robustness 1507 _in_deopt_handler--; 1508 } 1509 } 1510 1511 private: 1512 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1513 1514 public: 1515 1516 // Frame iteration; calls the function f for all frames on the stack 1517 void frames_do(void f(frame*, const RegisterMap*)); 1518 1519 // Memory operations 1520 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1521 1522 // Sweeper operations 1523 void nmethods_do(CodeBlobClosure* cf); 1524 1525 // RedefineClasses Support 1526 void metadata_do(void f(Metadata*)); 1527 1528 // Misc. operations 1529 char* name() const { return (char*)get_thread_name(); } 1530 void print_on(outputStream* st) const; 1531 void print_value(); 1532 void print_thread_state_on(outputStream*) const PRODUCT_RETURN; 1533 void print_thread_state() const PRODUCT_RETURN; 1534 void print_on_error(outputStream* st, char* buf, int buflen) const; 1535 void verify(); 1536 const char* get_thread_name() const; 1537 private: 1538 // factor out low-level mechanics for use in both normal and error cases 1539 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1540 public: 1541 const char* get_threadgroup_name() const; 1542 const char* get_parent_name() const; 1543 1544 // Accessing frames 1545 frame last_frame() { 1546 _anchor.make_walkable(this); 1547 return pd_last_frame(); 1548 } 1549 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1550 1551 // Returns method at 'depth' java or native frames down the stack 1552 // Used for security checks 1553 Klass* security_get_caller_class(int depth); 1554 1555 // Print stack trace in external format 1556 void print_stack_on(outputStream* st); 1557 void print_stack() { print_stack_on(tty); } 1558 1559 // Print stack traces in various internal formats 1560 void trace_stack() PRODUCT_RETURN; 1561 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1562 void trace_frames() PRODUCT_RETURN; 1563 void trace_oops() PRODUCT_RETURN; 1564 1565 // Print an annotated view of the stack frames 1566 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1567 void validate_frame_layout() { 1568 print_frame_layout(0, true); 1569 } 1570 1571 // Returns the number of stack frames on the stack 1572 int depth() const; 1573 1574 // Function for testing deoptimization 1575 void deoptimize(); 1576 void make_zombies(); 1577 1578 void deoptimized_wrt_marked_nmethods(); 1579 1580 // Profiling operation (see fprofile.cpp) 1581 public: 1582 bool profile_last_Java_frame(frame* fr); 1583 1584 private: 1585 ThreadProfiler* _thread_profiler; 1586 private: 1587 friend class FlatProfiler; // uses both [gs]et_thread_profiler. 1588 friend class FlatProfilerTask; // uses get_thread_profiler. 1589 friend class ThreadProfilerMark; // uses get_thread_profiler. 1590 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } 1591 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { 1592 ThreadProfiler* result = _thread_profiler; 1593 _thread_profiler = tp; 1594 return result; 1595 } 1596 1597 public: 1598 // Returns the running thread as a JavaThread 1599 static inline JavaThread* current(); 1600 1601 // Returns the active Java thread. Do not use this if you know you are calling 1602 // from a JavaThread, as it's slower than JavaThread::current. If called from 1603 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1604 // operation. You may not want that either. 1605 static JavaThread* active(); 1606 1607 inline CompilerThread* as_CompilerThread(); 1608 1609 public: 1610 virtual void run(); 1611 void thread_main_inner(); 1612 1613 private: 1614 // PRIVILEGED STACK 1615 PrivilegedElement* _privileged_stack_top; 1616 GrowableArray<oop>* _array_for_gc; 1617 public: 1618 1619 // Returns the privileged_stack information. 1620 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } 1621 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } 1622 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } 1623 1624 public: 1625 // Thread local information maintained by JVMTI. 1626 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1627 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1628 // getter is used to get this JavaThread's JvmtiThreadState if it has 1629 // one which means NULL can be returned. JvmtiThreadState::state_for() 1630 // is used to get the specified JavaThread's JvmtiThreadState if it has 1631 // one or it allocates a new JvmtiThreadState for the JavaThread and 1632 // returns it. JvmtiThreadState::state_for() will return NULL only if 1633 // the specified JavaThread is exiting. 1634 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1635 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1636 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } 1637 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } 1638 1639 // JVMTI PopFrame support 1640 // Setting and clearing popframe_condition 1641 // All of these enumerated values are bits. popframe_pending 1642 // indicates that a PopFrame() has been requested and not yet been 1643 // completed. popframe_processing indicates that that PopFrame() is in 1644 // the process of being completed. popframe_force_deopt_reexecution_bit 1645 // indicates that special handling is required when returning to a 1646 // deoptimized caller. 1647 enum PopCondition { 1648 popframe_inactive = 0x00, 1649 popframe_pending_bit = 0x01, 1650 popframe_processing_bit = 0x02, 1651 popframe_force_deopt_reexecution_bit = 0x04 1652 }; 1653 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1654 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1655 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1656 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1657 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1658 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1659 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1660 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1661 #ifdef CC_INTERP 1662 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } 1663 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } 1664 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1665 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1666 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1667 #endif 1668 1669 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1670 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1671 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1672 1673 private: 1674 // Saved incoming arguments to popped frame. 1675 // Used only when popped interpreted frame returns to deoptimized frame. 1676 void* _popframe_preserved_args; 1677 int _popframe_preserved_args_size; 1678 1679 public: 1680 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1681 void* popframe_preserved_args(); 1682 ByteSize popframe_preserved_args_size(); 1683 WordSize popframe_preserved_args_size_in_words(); 1684 void popframe_free_preserved_args(); 1685 1686 1687 private: 1688 JvmtiThreadState *_jvmti_thread_state; 1689 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; 1690 1691 // Used by the interpreter in fullspeed mode for frame pop, method 1692 // entry, method exit and single stepping support. This field is 1693 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. 1694 // It can be set to zero asynchronously (i.e., without a VM operation 1695 // or a lock) so we have to be very careful. 1696 int _interp_only_mode; 1697 1698 public: 1699 // used by the interpreter for fullspeed debugging support (see above) 1700 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1701 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1702 int get_interp_only_mode() { return _interp_only_mode; } 1703 void increment_interp_only_mode() { ++_interp_only_mode; } 1704 void decrement_interp_only_mode() { --_interp_only_mode; } 1705 1706 // support for cached flag that indicates whether exceptions need to be posted for this thread 1707 // if this is false, we can avoid deoptimizing when events are thrown 1708 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1709 private: 1710 int _should_post_on_exceptions_flag; 1711 1712 public: 1713 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1714 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1715 1716 private: 1717 ThreadStatistics *_thread_stat; 1718 1719 public: 1720 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1721 1722 // Return a blocker object for which this thread is blocked parking. 1723 oop current_park_blocker(); 1724 1725 private: 1726 static size_t _stack_size_at_create; 1727 1728 public: 1729 static inline size_t stack_size_at_create(void) { 1730 return _stack_size_at_create; 1731 } 1732 static inline void set_stack_size_at_create(size_t value) { 1733 _stack_size_at_create = value; 1734 } 1735 1736 #if INCLUDE_ALL_GCS 1737 // SATB marking queue support 1738 SATBMarkQueue& satb_mark_queue() { return _satb_mark_queue; } 1739 static SATBMarkQueueSet& satb_mark_queue_set() { 1740 return _satb_mark_queue_set; 1741 } 1742 1743 // Dirty card queue support 1744 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } 1745 static DirtyCardQueueSet& dirty_card_queue_set() { 1746 return _dirty_card_queue_set; 1747 } 1748 #endif // INCLUDE_ALL_GCS 1749 1750 // This method initializes the SATB and dirty card queues before a 1751 // JavaThread is added to the Java thread list. Right now, we don't 1752 // have to do anything to the dirty card queue (it should have been 1753 // activated when the thread was created), but we have to activate 1754 // the SATB queue if the thread is created while a marking cycle is 1755 // in progress. The activation / de-activation of the SATB queues at 1756 // the beginning / end of a marking cycle is done during safepoints 1757 // so we have to make sure this method is called outside one to be 1758 // able to safely read the active field of the SATB queue set. Right 1759 // now, it is called just before the thread is added to the Java 1760 // thread list in the Threads::add() method. That method is holding 1761 // the Threads_lock which ensures we are outside a safepoint. We 1762 // cannot do the obvious and set the active field of the SATB queue 1763 // when the thread is created given that, in some cases, safepoints 1764 // might happen between the JavaThread constructor being called and the 1765 // thread being added to the Java thread list (an example of this is 1766 // when the structure for the DestroyJavaVM thread is created). 1767 #if INCLUDE_ALL_GCS 1768 void initialize_queues(); 1769 #else // INCLUDE_ALL_GCS 1770 void initialize_queues() { } 1771 #endif // INCLUDE_ALL_GCS 1772 1773 // Machine dependent stuff 1774 #ifdef TARGET_OS_ARCH_linux_x86 1775 # include "thread_linux_x86.hpp" 1776 #endif 1777 #ifdef TARGET_OS_ARCH_linux_sparc 1778 # include "thread_linux_sparc.hpp" 1779 #endif 1780 #ifdef TARGET_OS_ARCH_linux_zero 1781 # include "thread_linux_zero.hpp" 1782 #endif 1783 #ifdef TARGET_OS_ARCH_solaris_x86 1784 # include "thread_solaris_x86.hpp" 1785 #endif 1786 #ifdef TARGET_OS_ARCH_solaris_sparc 1787 # include "thread_solaris_sparc.hpp" 1788 #endif 1789 #ifdef TARGET_OS_ARCH_windows_x86 1790 # include "thread_windows_x86.hpp" 1791 #endif 1792 #ifdef TARGET_OS_ARCH_linux_arm 1793 # include "thread_linux_arm.hpp" 1794 #endif 1795 #ifdef TARGET_OS_ARCH_linux_ppc 1796 # include "thread_linux_ppc.hpp" 1797 #endif 1798 #ifdef TARGET_OS_ARCH_linux_aarch64 1799 # include "thread_linux_aarch64.hpp" 1800 #endif 1801 #ifdef TARGET_OS_ARCH_aix_ppc 1802 # include "thread_aix_ppc.hpp" 1803 #endif 1804 #ifdef TARGET_OS_ARCH_bsd_x86 1805 # include "thread_bsd_x86.hpp" 1806 #endif 1807 #ifdef TARGET_OS_ARCH_bsd_zero 1808 # include "thread_bsd_zero.hpp" 1809 #endif 1810 1811 1812 public: 1813 void set_blocked_on_compilation(bool value) { 1814 _blocked_on_compilation = value; 1815 } 1816 1817 bool blocked_on_compilation() { 1818 return _blocked_on_compilation; 1819 } 1820 protected: 1821 bool _blocked_on_compilation; 1822 1823 1824 // JSR166 per-thread parker 1825 private: 1826 Parker* _parker; 1827 public: 1828 Parker* parker() { return _parker; } 1829 1830 // Biased locking support 1831 private: 1832 GrowableArray<MonitorInfo*>* _cached_monitor_info; 1833 public: 1834 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 1835 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 1836 1837 // clearing/querying jni attach status 1838 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1839 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1840 inline void set_done_attaching_via_jni(); 1841 private: 1842 // This field is used to determine if a thread has claimed 1843 // a par_id: it is UINT_MAX if the thread has not claimed a par_id; 1844 // otherwise its value is the par_id that has been claimed. 1845 uint _claimed_par_id; 1846 public: 1847 uint get_claimed_par_id() { return _claimed_par_id; } 1848 void set_claimed_par_id(uint id) { _claimed_par_id = id; } 1849 }; 1850 1851 // Inline implementation of JavaThread::current 1852 inline JavaThread* JavaThread::current() { 1853 Thread* thread = Thread::current(); 1854 assert(thread->is_Java_thread(), "just checking"); 1855 return (JavaThread*)thread; 1856 } 1857 1858 inline CompilerThread* JavaThread::as_CompilerThread() { 1859 assert(is_Compiler_thread(), "just checking"); 1860 return (CompilerThread*)this; 1861 } 1862 1863 // Dedicated thread to sweep the code cache 1864 class CodeCacheSweeperThread : public JavaThread { 1865 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper 1866 public: 1867 CodeCacheSweeperThread(); 1868 // Track the nmethod currently being scanned by the sweeper 1869 void set_scanned_nmethod(nmethod* nm) { 1870 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value"); 1871 _scanned_nmethod = nm; 1872 } 1873 1874 // Hide sweeper thread from external view. 1875 bool is_hidden_from_external_view() const { return true; } 1876 1877 bool is_Code_cache_sweeper_thread() const { return true; } 1878 // GC support 1879 // Apply "f->do_oop" to all root oops in "this". 1880 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 1881 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1882 }; 1883 1884 // A thread used for Compilation. 1885 class CompilerThread : public JavaThread { 1886 friend class VMStructs; 1887 private: 1888 CompilerCounters* _counters; 1889 1890 ciEnv* _env; 1891 CompileLog* _log; 1892 CompileTask* _task; 1893 CompileQueue* _queue; 1894 BufferBlob* _buffer_blob; 1895 1896 AbstractCompiler* _compiler; 1897 1898 public: 1899 1900 static CompilerThread* current(); 1901 1902 CompilerThread(CompileQueue* queue, CompilerCounters* counters); 1903 1904 bool is_Compiler_thread() const { return true; } 1905 1906 virtual bool can_call_java() const; 1907 1908 // Hide native compiler threads from external view. 1909 bool is_hidden_from_external_view() const { return !can_call_java(); } 1910 1911 void set_compiler(AbstractCompiler* c) { _compiler = c; } 1912 AbstractCompiler* compiler() const { return _compiler; } 1913 1914 CompileQueue* queue() const { return _queue; } 1915 CompilerCounters* counters() const { return _counters; } 1916 1917 // Get/set the thread's compilation environment. 1918 ciEnv* env() { return _env; } 1919 void set_env(ciEnv* env) { _env = env; } 1920 1921 BufferBlob* get_buffer_blob() const { return _buffer_blob; } 1922 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; } 1923 1924 // Get/set the thread's logging information 1925 CompileLog* log() { return _log; } 1926 void init_log(CompileLog* log) { 1927 // Set once, for good. 1928 assert(_log == NULL, "set only once"); 1929 _log = log; 1930 } 1931 1932 #ifndef PRODUCT 1933 private: 1934 IdealGraphPrinter *_ideal_graph_printer; 1935 public: 1936 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } 1937 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } 1938 #endif 1939 1940 // Get/set the thread's current task 1941 CompileTask* task() { return _task; } 1942 void set_task(CompileTask* task) { _task = task; } 1943 }; 1944 1945 inline CompilerThread* CompilerThread::current() { 1946 return JavaThread::current()->as_CompilerThread(); 1947 } 1948 1949 // The active thread queue. It also keeps track of the current used 1950 // thread priorities. 1951 class Threads: AllStatic { 1952 friend class VMStructs; 1953 private: 1954 static JavaThread* _thread_list; 1955 static int _number_of_threads; 1956 static int _number_of_non_daemon_threads; 1957 static int _return_code; 1958 static int _thread_claim_parity; 1959 #ifdef ASSERT 1960 static bool _vm_complete; 1961 #endif 1962 1963 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS); 1964 static void initialize_jsr292_core_classes(TRAPS); 1965 public: 1966 // Thread management 1967 // force_daemon is a concession to JNI, where we may need to add a 1968 // thread to the thread list before allocating its thread object 1969 static void add(JavaThread* p, bool force_daemon = false); 1970 static void remove(JavaThread* p); 1971 static bool includes(JavaThread* p); 1972 static JavaThread* first() { return _thread_list; } 1973 static void threads_do(ThreadClosure* tc); 1974 1975 // Initializes the vm and creates the vm thread 1976 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 1977 static void convert_vm_init_libraries_to_agents(); 1978 static void create_vm_init_libraries(); 1979 static void create_vm_init_agents(); 1980 static void shutdown_vm_agents(); 1981 static bool destroy_vm(); 1982 // Supported VM versions via JNI 1983 // Includes JNI_VERSION_1_1 1984 static jboolean is_supported_jni_version_including_1_1(jint version); 1985 // Does not include JNI_VERSION_1_1 1986 static jboolean is_supported_jni_version(jint version); 1987 1988 // The "thread claim parity" provides a way for threads to be claimed 1989 // by parallel worker tasks. 1990 // 1991 // Each thread contains a a "parity" field. A task will claim the 1992 // thread only if its parity field is the same as the global parity, 1993 // which is updated by calling change_thread_claim_parity(). 1994 // 1995 // For this to work change_thread_claim_parity() needs to be called 1996 // exactly once in sequential code before starting parallel tasks 1997 // that should claim threads. 1998 // 1999 // New threads get their parity set to 0 and change_thread_claim_parity() 2000 // never set the global parity to 0. 2001 static int thread_claim_parity() { return _thread_claim_parity; } 2002 static void change_thread_claim_parity(); 2003 static void assert_all_threads_claimed() NOT_DEBUG_RETURN; 2004 2005 // Apply "f->do_oop" to all root oops in all threads. 2006 // This version may only be called by sequential code. 2007 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 2008 // This version may be called by sequential or parallel code. 2009 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 2010 // This creates a list of GCTasks, one per thread. 2011 static void create_thread_roots_tasks(GCTaskQueue* q); 2012 // This creates a list of GCTasks, one per thread, for marking objects. 2013 static void create_thread_roots_marking_tasks(GCTaskQueue* q); 2014 2015 // Apply "f->do_oop" to roots in all threads that 2016 // are part of compiled frames 2017 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); 2018 2019 static void convert_hcode_pointers(); 2020 static void restore_hcode_pointers(); 2021 2022 // Sweeper 2023 static void nmethods_do(CodeBlobClosure* cf); 2024 2025 // RedefineClasses support 2026 static void metadata_do(void f(Metadata*)); 2027 static void metadata_handles_do(void f(Metadata*)); 2028 2029 #ifdef ASSERT 2030 static bool is_vm_complete() { return _vm_complete; } 2031 #endif 2032 2033 // Verification 2034 static void verify(); 2035 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); 2036 static void print(bool print_stacks, bool internal_format) { 2037 // this function is only used by debug.cpp 2038 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); 2039 } 2040 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 2041 2042 // Get Java threads that are waiting to enter a monitor. If doLock 2043 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2044 // VM needs to be at a safepoint. 2045 static GrowableArray<JavaThread*>* get_pending_threads(int count, 2046 address monitor, bool doLock); 2047 2048 // Get owning Java thread from the monitor's owner field. If doLock 2049 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2050 // VM needs to be at a safepoint. 2051 static JavaThread *owning_thread_from_monitor_owner(address owner, 2052 bool doLock); 2053 2054 // Number of threads on the active threads list 2055 static int number_of_threads() { return _number_of_threads; } 2056 // Number of non-daemon threads on the active threads list 2057 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 2058 2059 // Deoptimizes all frames tied to marked nmethods 2060 static void deoptimized_wrt_marked_nmethods(); 2061 2062 static JavaThread* find_java_thread_from_java_tid(jlong java_tid); 2063 2064 }; 2065 2066 2067 // Thread iterator 2068 class ThreadClosure: public StackObj { 2069 public: 2070 virtual void do_thread(Thread* thread) = 0; 2071 }; 2072 2073 class SignalHandlerMark: public StackObj { 2074 private: 2075 Thread* _thread; 2076 public: 2077 SignalHandlerMark(Thread* t) { 2078 _thread = t; 2079 if (_thread) _thread->enter_signal_handler(); 2080 } 2081 ~SignalHandlerMark() { 2082 if (_thread) _thread->leave_signal_handler(); 2083 _thread = NULL; 2084 } 2085 }; 2086 2087 2088 #endif // SHARE_VM_RUNTIME_THREAD_HPP