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