1 /* 2 * Copyright (c) 1997, 2016, 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 #if INCLUDE_ALL_GCS 50 #include "gc/g1/dirtyCardQueue.hpp" 51 #include "gc/g1/satbMarkQueue.hpp" 52 #endif // INCLUDE_ALL_GCS 53 #ifdef ZERO 54 # include "stack_zero.hpp" 55 #endif 56 57 class ThreadSafepointState; 58 class ThreadProfiler; 59 60 class JvmtiThreadState; 61 class JvmtiGetLoadedClassesClosure; 62 class ThreadStatistics; 63 class ConcurrentLocksDump; 64 class ParkEvent; 65 class Parker; 66 67 class ciEnv; 68 class CompileThread; 69 class CompileLog; 70 class CompileTask; 71 class CompileQueue; 72 class CompilerCounters; 73 class vframeArray; 74 75 class DeoptResourceMark; 76 class jvmtiDeferredLocalVariableSet; 77 78 class GCTaskQueue; 79 class ThreadClosure; 80 class IdealGraphPrinter; 81 82 class Metadata; 83 template <class T, MEMFLAGS F> class ChunkedList; 84 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer; 85 86 DEBUG_ONLY(class ResourceMark;) 87 88 class WorkerThread; 89 90 // Class hierarchy 91 // - Thread 92 // - NamedThread 93 // - VMThread 94 // - ConcurrentGCThread 95 // - WorkerThread 96 // - GangWorker 97 // - GCTaskThread 98 // - JavaThread 99 // - various subclasses eg CompilerThread, ServiceThread 100 // - WatcherThread 101 102 class Thread: public ThreadShadow { 103 friend class VMStructs; 104 friend class JVMCIVMStructs; 105 private: 106 107 #ifndef USE_LIBRARY_BASED_TLS_ONLY 108 // Current thread is maintained as a thread-local variable 109 static THREAD_LOCAL_DECL Thread* _thr_current; 110 #endif 111 112 // Exception handling 113 // (Note: _pending_exception and friends are in ThreadShadow) 114 //oop _pending_exception; // pending exception for current thread 115 // const char* _exception_file; // file information for exception (debugging only) 116 // int _exception_line; // line information for exception (debugging only) 117 protected: 118 // Support for forcing alignment of thread objects for biased locking 119 void* _real_malloc_address; 120 public: 121 void* operator new(size_t size) throw() { return allocate(size, true); } 122 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 123 return allocate(size, false); } 124 void operator delete(void* p); 125 126 protected: 127 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 128 private: 129 130 // *************************************************************** 131 // Suspend and resume support 132 // *************************************************************** 133 // 134 // VM suspend/resume no longer exists - it was once used for various 135 // things including safepoints but was deprecated and finally removed 136 // in Java 7. Because VM suspension was considered "internal" Java-level 137 // suspension was considered "external", and this legacy naming scheme 138 // remains. 139 // 140 // External suspend/resume requests come from JVM_SuspendThread, 141 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI 142 // ResumeThread. External 143 // suspend requests cause _external_suspend to be set and external 144 // resume requests cause _external_suspend to be cleared. 145 // External suspend requests do not nest on top of other external 146 // suspend requests. The higher level APIs reject suspend requests 147 // for already suspended threads. 148 // 149 // The external_suspend 150 // flag is checked by has_special_runtime_exit_condition() and java thread 151 // will self-suspend when handle_special_runtime_exit_condition() is 152 // called. Most uses of the _thread_blocked state in JavaThreads are 153 // considered the same as being externally suspended; if the blocking 154 // condition lifts, the JavaThread will self-suspend. Other places 155 // where VM checks for external_suspend include: 156 // + mutex granting (do not enter monitors when thread is suspended) 157 // + state transitions from _thread_in_native 158 // 159 // In general, java_suspend() does not wait for an external suspend 160 // request to complete. When it returns, the only guarantee is that 161 // the _external_suspend field is true. 162 // 163 // wait_for_ext_suspend_completion() is used to wait for an external 164 // suspend request to complete. External suspend requests are usually 165 // followed by some other interface call that requires the thread to 166 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into 167 // the interface that requires quiescence, we give the JavaThread a 168 // chance to self-suspend before we need it to be quiescent. This 169 // improves overall suspend/query performance. 170 // 171 // _suspend_flags controls the behavior of java_ suspend/resume. 172 // It must be set under the protection of SR_lock. Read from the flag is 173 // OK without SR_lock as long as the value is only used as a hint. 174 // (e.g., check _external_suspend first without lock and then recheck 175 // inside SR_lock and finish the suspension) 176 // 177 // _suspend_flags is also overloaded for other "special conditions" so 178 // that a single check indicates whether any special action is needed 179 // eg. for async exceptions. 180 // ------------------------------------------------------------------- 181 // Notes: 182 // 1. The suspend/resume logic no longer uses ThreadState in OSThread 183 // but we still update its value to keep other part of the system (mainly 184 // JVMTI) happy. ThreadState is legacy code (see notes in 185 // osThread.hpp). 186 // 187 // 2. It would be more natural if set_external_suspend() is private and 188 // part of java_suspend(), but that probably would affect the suspend/query 189 // performance. Need more investigation on this. 190 191 // suspend/resume lock: used for self-suspend 192 Monitor* _SR_lock; 193 194 protected: 195 enum SuspendFlags { 196 // NOTE: avoid using the sign-bit as cc generates different test code 197 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 198 199 _external_suspend = 0x20000000U, // thread is asked to self suspend 200 _ext_suspended = 0x40000000U, // thread has self-suspended 201 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt 202 203 _has_async_exception = 0x00000001U, // there is a pending async exception 204 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock 205 }; 206 207 // various suspension related flags - atomically updated 208 // overloaded for async exception checking in check_special_condition_for_native_trans. 209 volatile uint32_t _suspend_flags; 210 211 private: 212 int _num_nested_signal; 213 214 DEBUG_ONLY(bool _suspendible_thread;) 215 216 public: 217 void enter_signal_handler() { _num_nested_signal++; } 218 void leave_signal_handler() { _num_nested_signal--; } 219 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } 220 221 #ifdef ASSERT 222 void set_suspendible_thread() { 223 _suspendible_thread = true; 224 } 225 226 void clear_suspendible_thread() { 227 _suspendible_thread = false; 228 } 229 230 bool is_suspendible_thread() { return _suspendible_thread; } 231 #endif 232 233 private: 234 // Active_handles points to a block of handles 235 JNIHandleBlock* _active_handles; 236 237 // One-element thread local free list 238 JNIHandleBlock* _free_handle_block; 239 240 // Point to the last handle mark 241 HandleMark* _last_handle_mark; 242 243 // The parity of the last strong_roots iteration in which this thread was 244 // claimed as a task. 245 jint _oops_do_parity; 246 247 public: 248 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 249 HandleMark* last_handle_mark() const { return _last_handle_mark; } 250 private: 251 252 // debug support for checking if code does allow safepoints or not 253 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on 254 // mutex, or blocking on an object synchronizer (Java locking). 255 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases 256 // If !allow_allocation(), then an assertion failure will happen during allocation 257 // (Hence, !allow_safepoint() => !allow_allocation()). 258 // 259 // The two classes NoSafepointVerifier and No_Allocation_Verifier are used to set these counters. 260 // 261 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen 262 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. 263 264 // Used by SkipGCALot class. 265 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 266 267 friend class NoAllocVerifier; 268 friend class NoSafepointVerifier; 269 friend class PauseNoSafepointVerifier; 270 friend class GCLocker; 271 272 ThreadLocalAllocBuffer _tlab; // Thread-local eden 273 jlong _allocated_bytes; // Cumulative number of bytes allocated on 274 // the Java heap 275 276 mutable TRACE_DATA _trace_data; // Thread-local data for tracing 277 278 ThreadExt _ext; 279 280 int _vm_operation_started_count; // VM_Operation support 281 int _vm_operation_completed_count; // VM_Operation support 282 283 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread 284 // is waiting to lock 285 bool _current_pending_monitor_is_from_java; // locking is from Java code 286 287 // ObjectMonitor on which this thread called Object.wait() 288 ObjectMonitor* _current_waiting_monitor; 289 290 // Private thread-local objectmonitor list - a simple cache organized as a SLL. 291 public: 292 ObjectMonitor* omFreeList; 293 int omFreeCount; // length of omFreeList 294 int omFreeProvision; // reload chunk size 295 ObjectMonitor* omInUseList; // SLL to track monitors in circulation 296 int omInUseCount; // length of omInUseList 297 298 #ifdef ASSERT 299 private: 300 bool _visited_for_critical_count; 301 302 public: 303 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } 304 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } 305 #endif 306 307 public: 308 enum { 309 is_definitely_current_thread = true 310 }; 311 312 // Constructor 313 Thread(); 314 virtual ~Thread(); 315 316 // Manage Thread::current() 317 void initialize_thread_current(); 318 void clear_thread_current(); // TLS cleanup needed before threads terminate 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_DEFINE_THREAD_TRACE_DATA_OFFSET; 451 TRACE_DATA* trace_data() const { return &_trace_data; } 452 453 const ThreadExt& ext() const { return _ext; } 454 ThreadExt& ext() { return _ext; } 455 456 // VM operation support 457 int vm_operation_ticket() { return ++_vm_operation_started_count; } 458 int vm_operation_completed_count() { return _vm_operation_completed_count; } 459 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } 460 461 // For tracking the heavyweight monitor the thread is pending on. 462 ObjectMonitor* current_pending_monitor() { 463 return _current_pending_monitor; 464 } 465 void set_current_pending_monitor(ObjectMonitor* monitor) { 466 _current_pending_monitor = monitor; 467 } 468 void set_current_pending_monitor_is_from_java(bool from_java) { 469 _current_pending_monitor_is_from_java = from_java; 470 } 471 bool current_pending_monitor_is_from_java() { 472 return _current_pending_monitor_is_from_java; 473 } 474 475 // For tracking the ObjectMonitor on which this thread called Object.wait() 476 ObjectMonitor* current_waiting_monitor() { 477 return _current_waiting_monitor; 478 } 479 void set_current_waiting_monitor(ObjectMonitor* monitor) { 480 _current_waiting_monitor = monitor; 481 } 482 483 // GC support 484 // Apply "f->do_oop" to all root oops in "this". 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, 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 // jvmtiRedefineClasses support 511 void metadata_handles_do(void f(Metadata*)); 512 513 // Used by fast lock support 514 virtual bool is_lock_owned(address adr) const; 515 516 // Check if address is in the stack of the thread (not just for locks). 517 // Warning: the method can only be used on the running thread 518 bool is_in_stack(address adr) const; 519 // Check if address is in the usable part of the stack (excludes protected 520 // guard pages) 521 bool is_in_usable_stack(address adr) const; 522 523 // Sets this thread as starting thread. Returns failure if thread 524 // creation fails due to lack of memory, too many threads etc. 525 bool set_as_starting_thread(); 526 527 protected: 528 // OS data associated with the thread 529 OSThread* _osthread; // Platform-specific thread information 530 531 // Thread local resource area for temporary allocation within the VM 532 ResourceArea* _resource_area; 533 534 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 535 536 // Thread local handle area for allocation of handles within the VM 537 HandleArea* _handle_area; 538 GrowableArray<Metadata*>* _metadata_handles; 539 540 // Support for stack overflow handling, get_thread, etc. 541 address _stack_base; 542 size_t _stack_size; 543 uintptr_t _self_raw_id; // used by get_thread (mutable) 544 int _lgrp_id; 545 546 public: 547 // Stack overflow support 548 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 549 void set_stack_base(address base) { _stack_base = base; } 550 size_t stack_size() const { return _stack_size; } 551 void set_stack_size(size_t size) { _stack_size = size; } 552 address stack_end() const { return stack_base() - stack_size(); } 553 void record_stack_base_and_size(); 554 555 bool on_local_stack(address adr) const { 556 // QQQ this has knowledge of direction, ought to be a stack method 557 return (_stack_base >= adr && adr >= stack_end()); 558 } 559 560 uintptr_t self_raw_id() { return _self_raw_id; } 561 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } 562 563 int lgrp_id() const { return _lgrp_id; } 564 void set_lgrp_id(int value) { _lgrp_id = value; } 565 566 // Printing 567 virtual void print_on(outputStream* st) const; 568 void print() const { print_on(tty); } 569 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 570 571 // Debug-only code 572 #ifdef ASSERT 573 private: 574 // Deadlock detection support for Mutex locks. List of locks own by thread. 575 Monitor* _owned_locks; 576 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 577 // thus the friendship 578 friend class Mutex; 579 friend class Monitor; 580 581 public: 582 void print_owned_locks_on(outputStream* st) const; 583 void print_owned_locks() const { print_owned_locks_on(tty); } 584 Monitor* owned_locks() const { return _owned_locks; } 585 bool owns_locks() const { return owned_locks() != NULL; } 586 bool owns_locks_but_compiled_lock() const; 587 int oops_do_parity() const { return _oops_do_parity; } 588 589 // Deadlock detection 590 bool allow_allocation() { return _allow_allocation_count == 0; } 591 ResourceMark* current_resource_mark() { return _current_resource_mark; } 592 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 593 #endif 594 595 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; 596 597 private: 598 volatile int _jvmti_env_iteration_count; 599 600 public: 601 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 602 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 603 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 604 605 // Code generation 606 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); } 607 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); } 608 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); } 609 610 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); } 611 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); } 612 613 #define TLAB_FIELD_OFFSET(name) \ 614 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } 615 616 TLAB_FIELD_OFFSET(start) 617 TLAB_FIELD_OFFSET(end) 618 TLAB_FIELD_OFFSET(top) 619 TLAB_FIELD_OFFSET(pf_top) 620 TLAB_FIELD_OFFSET(size) // desired_size 621 TLAB_FIELD_OFFSET(refill_waste_limit) 622 TLAB_FIELD_OFFSET(number_of_refills) 623 TLAB_FIELD_OFFSET(fast_refill_waste) 624 TLAB_FIELD_OFFSET(slow_allocations) 625 626 #undef TLAB_FIELD_OFFSET 627 628 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); } 629 630 public: 631 volatile intptr_t _Stalled; 632 volatile int _TypeTag; 633 ParkEvent * _ParkEvent; // for synchronized() 634 ParkEvent * _SleepEvent; // for Thread.sleep 635 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor 636 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease 637 int NativeSyncRecursion; // diagnostic 638 639 volatile int _OnTrap; // Resume-at IP delta 640 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG 641 jint _hashStateX; // thread-specific hashCode generator state 642 jint _hashStateY; 643 jint _hashStateZ; 644 void * _schedctl; 645 646 647 volatile jint rng[4]; // RNG for spin loop 648 649 // Low-level leaf-lock primitives used to implement synchronization 650 // and native monitor-mutex infrastructure. 651 // Not for general synchronization use. 652 static void SpinAcquire(volatile int * Lock, const char * Name); 653 static void SpinRelease(volatile int * Lock); 654 static void muxAcquire(volatile intptr_t * Lock, const char * Name); 655 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev); 656 static void muxRelease(volatile intptr_t * Lock); 657 }; 658 659 // Inline implementation of Thread::current() 660 inline Thread* Thread::current() { 661 Thread* current = current_or_null(); 662 assert(current != NULL, "Thread::current() called on detached thread"); 663 return current; 664 } 665 666 inline Thread* Thread::current_or_null() { 667 #ifndef USE_LIBRARY_BASED_TLS_ONLY 668 return _thr_current; 669 #else 670 return ThreadLocalStorage::thread(); 671 #endif 672 } 673 674 inline Thread* Thread::current_or_null_safe() { 675 return ThreadLocalStorage::thread(); 676 } 677 678 // Name support for threads. non-JavaThread subclasses with multiple 679 // uniquely named instances should derive from this. 680 class NamedThread: public Thread { 681 friend class VMStructs; 682 enum { 683 max_name_len = 64 684 }; 685 private: 686 char* _name; 687 // log JavaThread being processed by oops_do 688 JavaThread* _processed_thread; 689 uint _gc_id; // The current GC id when a thread takes part in GC 690 691 public: 692 NamedThread(); 693 ~NamedThread(); 694 // May only be called once per thread. 695 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); 696 void initialize_named_thread(); 697 virtual bool is_Named_thread() const { return true; } 698 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } 699 JavaThread *processed_thread() { return _processed_thread; } 700 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } 701 virtual void print_on(outputStream* st) const; 702 703 void set_gc_id(uint gc_id) { _gc_id = gc_id; } 704 uint gc_id() { return _gc_id; } 705 }; 706 707 // Worker threads are named and have an id of an assigned work. 708 class WorkerThread: public NamedThread { 709 private: 710 uint _id; 711 public: 712 WorkerThread() : _id(0) { } 713 virtual bool is_Worker_thread() const { return true; } 714 715 virtual WorkerThread* as_Worker_thread() const { 716 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); 717 return (WorkerThread*) this; 718 } 719 720 void set_id(uint work_id) { _id = work_id; } 721 uint id() const { return _id; } 722 }; 723 724 // A single WatcherThread is used for simulating timer interrupts. 725 class WatcherThread: public Thread { 726 friend class VMStructs; 727 public: 728 virtual void run(); 729 730 private: 731 static WatcherThread* _watcher_thread; 732 733 static bool _startable; 734 // volatile due to at least one lock-free read 735 volatile static bool _should_terminate; 736 737 os::WatcherThreadCrashProtection* _crash_protection; 738 public: 739 enum SomeConstants { 740 delay_interval = 10 // interrupt delay in milliseconds 741 }; 742 743 // Constructor 744 WatcherThread(); 745 746 // No destruction allowed 747 ~WatcherThread() { 748 guarantee(false, "WatcherThread deletion must fix the race with VM termination"); 749 } 750 751 // Tester 752 bool is_Watcher_thread() const { return true; } 753 754 // Printing 755 char* name() const { return (char*)"VM Periodic Task Thread"; } 756 void print_on(outputStream* st) const; 757 void unpark(); 758 759 // Returns the single instance of WatcherThread 760 static WatcherThread* watcher_thread() { return _watcher_thread; } 761 762 // Create and start the single instance of WatcherThread, or stop it on shutdown 763 static void start(); 764 static void stop(); 765 // Only allow start once the VM is sufficiently initialized 766 // Otherwise the first task to enroll will trigger the start 767 static void make_startable(); 768 769 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) { 770 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread"); 771 _crash_protection = crash_protection; 772 } 773 774 bool has_crash_protection() const { return _crash_protection != NULL; } 775 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; } 776 777 private: 778 int sleep() const; 779 }; 780 781 782 class CompilerThread; 783 784 typedef void (*ThreadFunction)(JavaThread*, TRAPS); 785 786 class JavaThread: public Thread { 787 friend class VMStructs; 788 friend class JVMCIVMStructs; 789 friend class WhiteBox; 790 private: 791 JavaThread* _next; // The next thread in the Threads list 792 oop _threadObj; // The Java level thread object 793 794 #ifdef ASSERT 795 private: 796 int _java_call_counter; 797 798 public: 799 int java_call_counter() { return _java_call_counter; } 800 void inc_java_call_counter() { _java_call_counter++; } 801 void dec_java_call_counter() { 802 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 803 _java_call_counter--; 804 } 805 private: // restore original namespace restriction 806 #endif // ifdef ASSERT 807 808 #ifndef PRODUCT 809 public: 810 enum { 811 jump_ring_buffer_size = 16 812 }; 813 private: // restore original namespace restriction 814 #endif 815 816 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 817 818 size_t _bytes_until_sample; // Thread local counter to determine when to sample 819 // allocations. 820 821 ThreadFunction _entry_point; 822 823 JNIEnv _jni_environment; 824 825 // Deopt support 826 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 827 828 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we 829 // transition out of native 830 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized 831 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 832 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 833 // Because deoptimization is lazy we must save jvmti requests to set locals 834 // in compiled frames until we deoptimize and we have an interpreter frame. 835 // This holds the pointer to array (yeah like there might be more than one) of 836 // description of compiled vframes that have locals that need to be updated. 837 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; 838 839 // Handshake value for fixing 6243940. We need a place for the i2c 840 // adapter to store the callee Method*. This value is NEVER live 841 // across a gc point so it does NOT have to be gc'd 842 // The handshake is open ended since we can't be certain that it will 843 // be NULLed. This is because we rarely ever see the race and end up 844 // in handle_wrong_method which is the backend of the handshake. See 845 // code in i2c adapters and handle_wrong_method. 846 847 Method* _callee_target; 848 849 // Used to pass back results to the interpreter or generated code running Java code. 850 oop _vm_result; // oop result is GC-preserved 851 Metadata* _vm_result_2; // non-oop result 852 853 // See ReduceInitialCardMarks: this holds the precise space interval of 854 // the most recent slow path allocation for which compiled code has 855 // elided card-marks for performance along the fast-path. 856 MemRegion _deferred_card_mark; 857 858 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 859 // allocated during deoptimization 860 // and by JNI_MonitorEnter/Exit 861 862 // Async. requests support 863 enum AsyncRequests { 864 _no_async_condition = 0, 865 _async_exception, 866 _async_unsafe_access_error 867 }; 868 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request 869 oop _pending_async_exception; 870 871 // Safepoint support 872 public: // Expose _thread_state for SafeFetchInt() 873 volatile JavaThreadState _thread_state; 874 private: 875 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint 876 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 877 878 // JavaThread termination support 879 enum TerminatedTypes { 880 _not_terminated = 0xDEAD - 2, 881 _thread_exiting, // JavaThread::exit() has been called for this thread 882 _thread_terminated, // JavaThread is removed from thread list 883 _vm_exited // JavaThread is still executing native code, but VM is terminated 884 // only VM_Exit can set _vm_exited 885 }; 886 887 // In general a JavaThread's _terminated field transitions as follows: 888 // 889 // _not_terminated => _thread_exiting => _thread_terminated 890 // 891 // _vm_exited is a special value to cover the case of a JavaThread 892 // executing native code after the VM itself is terminated. 893 volatile TerminatedTypes _terminated; 894 // suspend/resume support 895 volatile bool _suspend_equivalent; // Suspend equivalent condition 896 jint _in_deopt_handler; // count of deoptimization 897 // handlers thread is in 898 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 899 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 900 // never locked) when throwing an exception. Used by interpreter only. 901 902 // JNI attach states: 903 enum JNIAttachStates { 904 _not_attaching_via_jni = 1, // thread is not attaching via JNI 905 _attaching_via_jni, // thread is attaching via JNI 906 _attached_via_jni // thread has attached via JNI 907 }; 908 909 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 910 // A native thread that is attaching via JNI starts with a value 911 // of _attaching_via_jni and transitions to _attached_via_jni. 912 volatile JNIAttachStates _jni_attach_state; 913 914 public: 915 // State of the stack guard pages for this thread. 916 enum StackGuardState { 917 stack_guard_unused, // not needed 918 stack_guard_reserved_disabled, 919 stack_guard_yellow_reserved_disabled,// disabled (temporarily) after stack overflow 920 stack_guard_enabled // enabled 921 }; 922 923 private: 924 925 #if INCLUDE_JVMCI 926 // The _pending_* fields below are used to communicate extra information 927 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. 928 929 // Communicates the DeoptReason and DeoptAction of the uncommon trap 930 int _pending_deoptimization; 931 932 // Specifies whether the uncommon trap is to bci 0 of a synchronized method 933 // before the monitor has been acquired. 934 bool _pending_monitorenter; 935 936 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter 937 bool _pending_transfer_to_interpreter; 938 939 // Guard for re-entrant call to JVMCIRuntime::adjust_comp_level 940 bool _adjusting_comp_level; 941 942 // An object that JVMCI compiled code can use to further describe and 943 // uniquely identify the speculative optimization guarded by the uncommon trap 944 oop _pending_failed_speculation; 945 946 // These fields are mutually exclusive in terms of live ranges. 947 union { 948 // Communicates the pc at which the most recent implicit exception occurred 949 // from the signal handler to a deoptimization stub. 950 address _implicit_exception_pc; 951 952 // Communicates an alternative call target to an i2c stub from a JavaCall . 953 address _alternate_call_target; 954 } _jvmci; 955 956 // Support for high precision, thread sensitive counters in JVMCI compiled code. 957 jlong* _jvmci_counters; 958 959 public: 960 static jlong* _jvmci_old_thread_counters; 961 static void collect_counters(typeArrayOop array); 962 private: 963 #endif // INCLUDE_JVMCI 964 965 StackGuardState _stack_guard_state; 966 967 // Precompute the limit of the stack as used in stack overflow checks. 968 // We load it from here to simplify the stack overflow check in assembly. 969 address _stack_overflow_limit; 970 address _reserved_stack_activation; 971 972 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 973 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 974 // code) 975 volatile oop _exception_oop; // Exception thrown in compiled code 976 volatile address _exception_pc; // PC where exception happened 977 volatile address _exception_handler_pc; // PC for handler of exception 978 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 979 980 private: 981 // support for JNI critical regions 982 jint _jni_active_critical; // count of entries into JNI critical region 983 984 // Checked JNI: function name requires exception check 985 char* _pending_jni_exception_check_fn; 986 987 // For deadlock detection. 988 int _depth_first_number; 989 990 // JVMTI PopFrame support 991 // This is set to popframe_pending to signal that top Java frame should be popped immediately 992 int _popframe_condition; 993 994 // If reallocation of scalar replaced objects fails, we throw OOM 995 // and during exception propagation, pop the top 996 // _frames_to_pop_failed_realloc frames, the ones that reference 997 // failed reallocations. 998 int _frames_to_pop_failed_realloc; 999 1000 #ifndef PRODUCT 1001 int _jmp_ring_index; 1002 struct { 1003 // We use intptr_t instead of address so debugger doesn't try and display strings 1004 intptr_t _target; 1005 intptr_t _instruction; 1006 const char* _file; 1007 int _line; 1008 } _jmp_ring[jump_ring_buffer_size]; 1009 #endif // PRODUCT 1010 1011 #if INCLUDE_ALL_GCS 1012 // Support for G1 barriers 1013 1014 SATBMarkQueue _satb_mark_queue; // Thread-local log for SATB barrier. 1015 // Set of all such queues. 1016 static SATBMarkQueueSet _satb_mark_queue_set; 1017 1018 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. 1019 // Set of all such queues. 1020 static DirtyCardQueueSet _dirty_card_queue_set; 1021 1022 void flush_barrier_queues(); 1023 #endif // INCLUDE_ALL_GCS 1024 1025 friend class VMThread; 1026 friend class ThreadWaitTransition; 1027 friend class VM_Exit; 1028 1029 void initialize(); // Initialized the instance variables 1030 1031 public: 1032 // Constructor 1033 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads 1034 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 1035 ~JavaThread(); 1036 1037 #ifdef ASSERT 1038 // verify this JavaThread hasn't be published in the Threads::list yet 1039 void verify_not_published(); 1040 #endif 1041 1042 //JNI functiontable getter/setter for JVMTI jni function table interception API. 1043 void set_jni_functions(struct JNINativeInterface_* functionTable) { 1044 _jni_environment.functions = functionTable; 1045 } 1046 struct JNINativeInterface_* get_jni_functions() { 1047 return (struct JNINativeInterface_ *)_jni_environment.functions; 1048 } 1049 1050 // This function is called at thread creation to allow 1051 // platform specific thread variables to be initialized. 1052 void cache_global_variables(); 1053 1054 // Executes Shutdown.shutdown() 1055 void invoke_shutdown_hooks(); 1056 1057 // Cleanup on thread exit 1058 enum ExitType { 1059 normal_exit, 1060 jni_detach 1061 }; 1062 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 1063 1064 void cleanup_failed_attach_current_thread(); 1065 1066 // Testers 1067 virtual bool is_Java_thread() const { return true; } 1068 virtual bool can_call_java() const { return true; } 1069 1070 // Thread chain operations 1071 JavaThread* next() const { return _next; } 1072 void set_next(JavaThread* p) { _next = p; } 1073 1074 // Thread oop. threadObj() can be NULL for initial JavaThread 1075 // (or for threads attached via JNI) 1076 oop threadObj() const { return _threadObj; } 1077 void set_threadObj(oop p) { _threadObj = p; } 1078 1079 ThreadPriority java_priority() const; // Read from threadObj() 1080 1081 // Prepare thread and add to priority queue. If a priority is 1082 // not specified, use the priority of the thread object. Threads_lock 1083 // must be held while this function is called. 1084 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 1085 void prepare_ext(); 1086 1087 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 1088 address saved_exception_pc() { return _saved_exception_pc; } 1089 1090 1091 ThreadFunction entry_point() const { return _entry_point; } 1092 1093 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1094 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS); 1095 1096 // Last frame anchor routines 1097 1098 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1099 1100 // last_Java_sp 1101 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1102 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1103 1104 // last_Java_pc 1105 1106 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1107 1108 // Bytes until next heap sample. 1109 size_t* bytes_until_sample() { return &_bytes_until_sample; } 1110 1111 // Safepoint support 1112 #if !(defined(PPC64) || defined(AARCH64)) 1113 JavaThreadState thread_state() const { return _thread_state; } 1114 void set_thread_state(JavaThreadState s) { _thread_state = s; } 1115 #else 1116 // Use membars when accessing volatile _thread_state. See 1117 // Threads::create_vm() for size checks. 1118 inline JavaThreadState thread_state() const; 1119 inline void set_thread_state(JavaThreadState s); 1120 #endif 1121 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } 1122 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } 1123 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } 1124 1125 // thread has called JavaThread::exit() or is terminated 1126 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } 1127 // thread is terminated (no longer on the threads list); we compare 1128 // against the two non-terminated values so that a freed JavaThread 1129 // will also be considered terminated. 1130 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } 1131 void set_terminated(TerminatedTypes t) { _terminated = t; } 1132 // special for Threads::remove() which is static: 1133 void set_terminated_value() { _terminated = _thread_terminated; } 1134 void block_if_vm_exited(); 1135 1136 bool doing_unsafe_access() { return _doing_unsafe_access; } 1137 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1138 1139 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1140 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1141 1142 // Suspend/resume support for JavaThread 1143 private: 1144 inline void set_ext_suspended(); 1145 inline void clear_ext_suspended(); 1146 1147 public: 1148 void java_suspend(); 1149 void java_resume(); 1150 int java_suspend_self(); 1151 1152 void check_and_wait_while_suspended() { 1153 assert(JavaThread::current() == this, "sanity check"); 1154 1155 bool do_self_suspend; 1156 do { 1157 // were we externally suspended while we were waiting? 1158 do_self_suspend = handle_special_suspend_equivalent_condition(); 1159 if (do_self_suspend) { 1160 // don't surprise the thread that suspended us by returning 1161 java_suspend_self(); 1162 set_suspend_equivalent(); 1163 } 1164 } while (do_self_suspend); 1165 } 1166 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); 1167 // Check for async exception in addition to safepoint and suspend request. 1168 static void check_special_condition_for_native_trans(JavaThread *thread); 1169 1170 // Same as check_special_condition_for_native_trans but finishes the 1171 // transition into thread_in_Java mode so that it can potentially 1172 // block. 1173 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); 1174 1175 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); 1176 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { 1177 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1178 // Warning: is_ext_suspend_completed() may temporarily drop the 1179 // SR_lock to allow the thread to reach a stable thread state if 1180 // it is currently in a transient thread state. 1181 return is_ext_suspend_completed(false /* !called_by_wait */, 1182 SuspendRetryDelay, bits); 1183 } 1184 1185 // We cannot allow wait_for_ext_suspend_completion() to run forever or 1186 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally 1187 // passed as the count and delay parameters. Experiments with specific 1188 // calls to wait_for_ext_suspend_completion() can be done by passing 1189 // other values in the code. Experiments with all calls can be done 1190 // via the appropriate -XX options. 1191 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); 1192 1193 inline void set_external_suspend(); 1194 inline void clear_external_suspend(); 1195 1196 inline void set_deopt_suspend(); 1197 inline void clear_deopt_suspend(); 1198 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } 1199 1200 bool is_external_suspend() const { 1201 return (_suspend_flags & _external_suspend) != 0; 1202 } 1203 // Whenever a thread transitions from native to vm/java it must suspend 1204 // if external|deopt suspend is present. 1205 bool is_suspend_after_native() const { 1206 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0; 1207 } 1208 1209 // external suspend request is completed 1210 bool is_ext_suspended() const { 1211 return (_suspend_flags & _ext_suspended) != 0; 1212 } 1213 1214 bool is_external_suspend_with_lock() const { 1215 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1216 return is_external_suspend(); 1217 } 1218 1219 // Special method to handle a pending external suspend request 1220 // when a suspend equivalent condition lifts. 1221 bool handle_special_suspend_equivalent_condition() { 1222 assert(is_suspend_equivalent(), 1223 "should only be called in a suspend equivalence condition"); 1224 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1225 bool ret = is_external_suspend(); 1226 if (!ret) { 1227 // not about to self-suspend so clear suspend equivalence 1228 clear_suspend_equivalent(); 1229 } 1230 // implied else: 1231 // We have a pending external suspend request so we leave the 1232 // suspend_equivalent flag set until java_suspend_self() sets 1233 // the ext_suspended flag and clears the suspend_equivalent 1234 // flag. This insures that wait_for_ext_suspend_completion() 1235 // will return consistent values. 1236 return ret; 1237 } 1238 1239 // utility methods to see if we are doing some kind of suspension 1240 bool is_being_ext_suspended() const { 1241 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1242 return is_ext_suspended() || is_external_suspend(); 1243 } 1244 1245 bool is_suspend_equivalent() const { return _suspend_equivalent; } 1246 1247 void set_suspend_equivalent() { _suspend_equivalent = true; } 1248 void clear_suspend_equivalent() { _suspend_equivalent = false; } 1249 1250 // Thread.stop support 1251 void send_thread_stop(oop throwable); 1252 AsyncRequests clear_special_runtime_exit_condition() { 1253 AsyncRequests x = _special_runtime_exit_condition; 1254 _special_runtime_exit_condition = _no_async_condition; 1255 return x; 1256 } 1257 1258 // Are any async conditions present? 1259 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } 1260 1261 void check_and_handle_async_exceptions(bool check_unsafe_error = true); 1262 1263 // these next two are also used for self-suspension and async exception support 1264 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1265 1266 // Return true if JavaThread has an asynchronous condition or 1267 // if external suspension is requested. 1268 bool has_special_runtime_exit_condition() { 1269 // We call is_external_suspend() last since external suspend should 1270 // be less common. Because we don't use is_external_suspend_with_lock 1271 // it is possible that we won't see an asynchronous external suspend 1272 // request that has just gotten started, i.e., SR_lock grabbed but 1273 // _external_suspend field change either not made yet or not visible 1274 // yet. However, this is okay because the request is asynchronous and 1275 // we will see the new flag value the next time through. It's also 1276 // possible that the external suspend request is dropped after 1277 // we have checked is_external_suspend(), we will recheck its value 1278 // under SR_lock in java_suspend_self(). 1279 return (_special_runtime_exit_condition != _no_async_condition) || 1280 is_external_suspend() || is_deopt_suspend(); 1281 } 1282 1283 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } 1284 1285 inline void set_pending_async_exception(oop e); 1286 1287 // Fast-locking support 1288 bool is_lock_owned(address adr) const; 1289 1290 // Accessors for vframe array top 1291 // The linked list of vframe arrays are sorted on sp. This means when we 1292 // unpack the head must contain the vframe array to unpack. 1293 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1294 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1295 1296 // Side structure for deferring update of java frame locals until deopt occurs 1297 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } 1298 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } 1299 1300 // These only really exist to make debugging deopt problems simpler 1301 1302 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1303 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1304 1305 // The special resourceMark used during deoptimization 1306 1307 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1308 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1309 1310 intptr_t* must_deopt_id() { return _must_deopt_id; } 1311 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } 1312 void clear_must_deopt_id() { _must_deopt_id = NULL; } 1313 1314 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; } 1315 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; } 1316 1317 Method* callee_target() const { return _callee_target; } 1318 void set_callee_target (Method* x) { _callee_target = x; } 1319 1320 // Oop results of vm runtime calls 1321 oop vm_result() const { return _vm_result; } 1322 void set_vm_result (oop x) { _vm_result = x; } 1323 1324 Metadata* vm_result_2() const { return _vm_result_2; } 1325 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1326 1327 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1328 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1329 1330 #if INCLUDE_JVMCI 1331 int pending_deoptimization() const { return _pending_deoptimization; } 1332 oop pending_failed_speculation() const { return _pending_failed_speculation; } 1333 bool adjusting_comp_level() const { return _adjusting_comp_level; } 1334 void set_adjusting_comp_level(bool b) { _adjusting_comp_level = b; } 1335 bool has_pending_monitorenter() const { return _pending_monitorenter; } 1336 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } 1337 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } 1338 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; } 1339 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } 1340 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; } 1341 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; } 1342 #endif // INCLUDE_JVMCI 1343 1344 // Exception handling for compiled methods 1345 oop exception_oop() const { return _exception_oop; } 1346 address exception_pc() const { return _exception_pc; } 1347 address exception_handler_pc() const { return _exception_handler_pc; } 1348 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1349 1350 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); } 1351 void set_exception_pc(address a) { _exception_pc = a; } 1352 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1353 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1354 1355 void clear_exception_oop_and_pc() { 1356 set_exception_oop(NULL); 1357 set_exception_pc(NULL); 1358 } 1359 1360 // Stack overflow support 1361 // 1362 // (small addresses) 1363 // 1364 // -- <-- stack_end() --- 1365 // | | 1366 // | red pages | 1367 // | | 1368 // -- <-- stack_red_zone_base() | 1369 // | | 1370 // | guard 1371 // | yellow pages zone 1372 // | | 1373 // | | 1374 // -- <-- stack_yellow_zone_base() | 1375 // | | 1376 // | | 1377 // | reserved pages | 1378 // | | 1379 // -- <-- stack_reserved_zone_base() --- --- 1380 // /|\ shadow <-- stack_overflow_limit() (somewhere in here) 1381 // | zone 1382 // \|/ size 1383 // some untouched memory --- 1384 // 1385 // 1386 // -- 1387 // | 1388 // | shadow zone 1389 // | 1390 // -- 1391 // x frame n 1392 // -- 1393 // x frame n-1 1394 // x 1395 // -- 1396 // ... 1397 // 1398 // -- 1399 // x frame 0 1400 // -- <-- stack_base() 1401 // 1402 // (large addresses) 1403 // 1404 1405 private: 1406 // These values are derived from flags StackRedPages, StackYellowPages, 1407 // StackReservedPages and StackShadowPages. The zone size is determined 1408 // ergonomically if page_size > 4K. 1409 static size_t _stack_red_zone_size; 1410 static size_t _stack_yellow_zone_size; 1411 static size_t _stack_reserved_zone_size; 1412 static size_t _stack_shadow_zone_size; 1413 public: 1414 inline size_t stack_available(address cur_sp); 1415 1416 static size_t stack_red_zone_size() { 1417 assert(_stack_red_zone_size > 0, "Don't call this before the field is initialized."); 1418 return _stack_red_zone_size; 1419 } 1420 static void set_stack_red_zone_size(size_t s) { 1421 assert(is_size_aligned(s, os::vm_page_size()), 1422 "We can not protect if the red zone size is not page aligned."); 1423 assert(_stack_red_zone_size == 0, "This should be called only once."); 1424 _stack_red_zone_size = s; 1425 } 1426 address stack_red_zone_base() { 1427 return (address)(stack_end() + stack_red_zone_size()); 1428 } 1429 bool in_stack_red_zone(address a) { 1430 return a <= stack_red_zone_base() && a >= stack_end(); 1431 } 1432 1433 static size_t stack_yellow_zone_size() { 1434 assert(_stack_yellow_zone_size > 0, "Don't call this before the field is initialized."); 1435 return _stack_yellow_zone_size; 1436 } 1437 static void set_stack_yellow_zone_size(size_t s) { 1438 assert(is_size_aligned(s, os::vm_page_size()), 1439 "We can not protect if the yellow zone size is not page aligned."); 1440 assert(_stack_yellow_zone_size == 0, "This should be called only once."); 1441 _stack_yellow_zone_size = s; 1442 } 1443 1444 static size_t stack_reserved_zone_size() { 1445 // _stack_reserved_zone_size may be 0. This indicates the feature is off. 1446 return _stack_reserved_zone_size; 1447 } 1448 static void set_stack_reserved_zone_size(size_t s) { 1449 assert(is_size_aligned(s, os::vm_page_size()), 1450 "We can not protect if the reserved zone size is not page aligned."); 1451 assert(_stack_reserved_zone_size == 0, "This should be called only once."); 1452 _stack_reserved_zone_size = s; 1453 } 1454 address stack_reserved_zone_base() { 1455 return (address)(stack_end() + 1456 (stack_red_zone_size() + stack_yellow_zone_size() + stack_reserved_zone_size())); 1457 } 1458 bool in_stack_reserved_zone(address a) { 1459 return (a <= stack_reserved_zone_base()) && 1460 (a >= (address)((intptr_t)stack_reserved_zone_base() - stack_reserved_zone_size())); 1461 } 1462 1463 static size_t stack_yellow_reserved_zone_size() { 1464 return _stack_yellow_zone_size + _stack_reserved_zone_size; 1465 } 1466 bool in_stack_yellow_reserved_zone(address a) { 1467 return (a <= stack_reserved_zone_base()) && (a >= stack_red_zone_base()); 1468 } 1469 1470 // Size of red + yellow + reserved zones. 1471 static size_t stack_guard_zone_size() { 1472 return stack_red_zone_size() + stack_yellow_reserved_zone_size(); 1473 } 1474 1475 static size_t stack_shadow_zone_size() { 1476 assert(_stack_shadow_zone_size > 0, "Don't call this before the field is initialized."); 1477 return _stack_shadow_zone_size; 1478 } 1479 static void set_stack_shadow_zone_size(size_t s) { 1480 // The shadow area is not allocated or protected, so 1481 // it needs not be page aligned. 1482 // But the stack bang currently assumes that it is a 1483 // multiple of page size. This guarantees that the bang 1484 // loop touches all pages in the shadow zone. 1485 // This can be guaranteed differently, as well. E.g., if 1486 // the page size is a multiple of 4K, banging in 4K steps 1487 // suffices to touch all pages. (Some pages are banged 1488 // several times, though.) 1489 assert(is_size_aligned(s, os::vm_page_size()), 1490 "Stack bang assumes multiple of page size."); 1491 assert(_stack_shadow_zone_size == 0, "This should be called only once."); 1492 _stack_shadow_zone_size = s; 1493 } 1494 1495 void create_stack_guard_pages(); 1496 void remove_stack_guard_pages(); 1497 1498 void enable_stack_reserved_zone(); 1499 void disable_stack_reserved_zone(); 1500 void enable_stack_yellow_reserved_zone(); 1501 void disable_stack_yellow_reserved_zone(); 1502 void enable_stack_red_zone(); 1503 void disable_stack_red_zone(); 1504 1505 inline bool stack_guard_zone_unused(); 1506 inline bool stack_yellow_reserved_zone_disabled(); 1507 inline bool stack_reserved_zone_disabled(); 1508 inline bool stack_guards_enabled(); 1509 1510 address reserved_stack_activation() const { return _reserved_stack_activation; } 1511 void set_reserved_stack_activation(address addr) { 1512 assert(_reserved_stack_activation == stack_base() 1513 || _reserved_stack_activation == NULL 1514 || addr == stack_base(), "Must not be set twice"); 1515 _reserved_stack_activation = addr; 1516 } 1517 1518 // Attempt to reguard the stack after a stack overflow may have occurred. 1519 // Returns true if (a) guard pages are not needed on this thread, (b) the 1520 // pages are already guarded, or (c) the pages were successfully reguarded. 1521 // Returns false if there is not enough stack space to reguard the pages, in 1522 // which case the caller should unwind a frame and try again. The argument 1523 // should be the caller's (approximate) sp. 1524 bool reguard_stack(address cur_sp); 1525 // Similar to above but see if current stackpoint is out of the guard area 1526 // and reguard if possible. 1527 bool reguard_stack(void); 1528 1529 address stack_overflow_limit() { return _stack_overflow_limit; } 1530 void set_stack_overflow_limit() { 1531 _stack_overflow_limit = 1532 stack_end() + MAX2(JavaThread::stack_guard_zone_size(), JavaThread::stack_shadow_zone_size()); 1533 } 1534 1535 // Misc. accessors/mutators 1536 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1537 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1538 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1539 1540 #ifndef PRODUCT 1541 void record_jump(address target, address instr, const char* file, int line); 1542 #endif // PRODUCT 1543 1544 // For assembly stub generation 1545 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } 1546 #ifndef PRODUCT 1547 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); } 1548 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); } 1549 #endif // PRODUCT 1550 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } 1551 static ByteSize pending_jni_exception_check_fn_offset() { 1552 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn); 1553 } 1554 static ByteSize last_Java_sp_offset() { 1555 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1556 } 1557 static ByteSize last_Java_pc_offset() { 1558 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1559 } 1560 static ByteSize frame_anchor_offset() { 1561 return byte_offset_of(JavaThread, _anchor); 1562 } 1563 static ByteSize bytes_until_sample_offset() { return byte_offset_of(JavaThread, _bytes_until_sample); } 1564 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } 1565 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } 1566 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } 1567 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } 1568 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } 1569 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } 1570 #if INCLUDE_JVMCI 1571 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); } 1572 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); } 1573 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); } 1574 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); } 1575 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); } 1576 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); } 1577 #endif // INCLUDE_JVMCI 1578 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } 1579 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } 1580 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1581 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } 1582 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1583 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); } 1584 static ByteSize reserved_stack_activation_offset() { return byte_offset_of(JavaThread, _reserved_stack_activation); } 1585 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } 1586 1587 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1588 static ByteSize should_post_on_exceptions_flag_offset() { 1589 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1590 } 1591 1592 #if INCLUDE_ALL_GCS 1593 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } 1594 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } 1595 #endif // INCLUDE_ALL_GCS 1596 1597 // Returns the jni environment for this thread 1598 JNIEnv* jni_environment() { return &_jni_environment; } 1599 1600 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1601 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1602 // Only return NULL if thread is off the thread list; starting to 1603 // exit should not return NULL. 1604 if (thread_from_jni_env->is_terminated()) { 1605 thread_from_jni_env->block_if_vm_exited(); 1606 return NULL; 1607 } else { 1608 return thread_from_jni_env; 1609 } 1610 } 1611 1612 // JNI critical regions. These can nest. 1613 bool in_critical() { return _jni_active_critical > 0; } 1614 bool in_last_critical() { return _jni_active_critical == 1; } 1615 void enter_critical() { 1616 assert(Thread::current() == this || 1617 (Thread::current()->is_VM_thread() && 1618 SafepointSynchronize::is_synchronizing()), 1619 "this must be current thread or synchronizing"); 1620 _jni_active_critical++; 1621 } 1622 void exit_critical() { 1623 assert(Thread::current() == this, "this must be current thread"); 1624 _jni_active_critical--; 1625 assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); 1626 } 1627 1628 // Checked JNI: is the programmer required to check for exceptions, if so specify 1629 // which function name. Returning to a Java frame should implicitly clear the 1630 // pending check, this is done for Native->Java transitions (i.e. user JNI code). 1631 // VM->Java transistions are not cleared, it is expected that JNI code enclosed 1632 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal). 1633 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1634 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1635 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1636 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1637 1638 // For deadlock detection 1639 int depth_first_number() { return _depth_first_number; } 1640 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1641 1642 private: 1643 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1644 1645 public: 1646 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1647 void add_monitor_chunk(MonitorChunk* chunk); 1648 void remove_monitor_chunk(MonitorChunk* chunk); 1649 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1650 void inc_in_deopt_handler() { _in_deopt_handler++; } 1651 void dec_in_deopt_handler() { 1652 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1653 if (_in_deopt_handler > 0) { // robustness 1654 _in_deopt_handler--; 1655 } 1656 } 1657 1658 private: 1659 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1660 1661 public: 1662 1663 // Frame iteration; calls the function f for all frames on the stack 1664 void frames_do(void f(frame*, const RegisterMap*)); 1665 1666 // Memory operations 1667 void oops_do(OopClosure* f, CodeBlobClosure* cf); 1668 1669 // Sweeper operations 1670 virtual void nmethods_do(CodeBlobClosure* cf); 1671 1672 // RedefineClasses Support 1673 void metadata_do(void f(Metadata*)); 1674 1675 // Misc. operations 1676 char* name() const { return (char*)get_thread_name(); } 1677 void print_on(outputStream* st) const; 1678 void print_value(); 1679 void print_thread_state_on(outputStream*) const PRODUCT_RETURN; 1680 void print_thread_state() const PRODUCT_RETURN; 1681 void print_on_error(outputStream* st, char* buf, int buflen) const; 1682 void print_name_on_error(outputStream* st, char* buf, int buflen) const; 1683 void verify(); 1684 const char* get_thread_name() const; 1685 private: 1686 // factor out low-level mechanics for use in both normal and error cases 1687 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1688 public: 1689 const char* get_threadgroup_name() const; 1690 const char* get_parent_name() const; 1691 1692 // Accessing frames 1693 frame last_frame() { 1694 _anchor.make_walkable(this); 1695 return pd_last_frame(); 1696 } 1697 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1698 1699 // Returns method at 'depth' java or native frames down the stack 1700 // Used for security checks 1701 Klass* security_get_caller_class(int depth); 1702 1703 // Print stack trace in external format 1704 void print_stack_on(outputStream* st); 1705 void print_stack() { print_stack_on(tty); } 1706 1707 // Print stack traces in various internal formats 1708 void trace_stack() PRODUCT_RETURN; 1709 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1710 void trace_frames() PRODUCT_RETURN; 1711 void trace_oops() PRODUCT_RETURN; 1712 1713 // Print an annotated view of the stack frames 1714 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1715 void validate_frame_layout() { 1716 print_frame_layout(0, true); 1717 } 1718 1719 // Returns the number of stack frames on the stack 1720 int depth() const; 1721 1722 // Function for testing deoptimization 1723 void deoptimize(); 1724 void make_zombies(); 1725 1726 void deoptimized_wrt_marked_nmethods(); 1727 1728 // Profiling operation (see fprofile.cpp) 1729 public: 1730 bool profile_last_Java_frame(frame* fr); 1731 1732 private: 1733 ThreadProfiler* _thread_profiler; 1734 private: 1735 friend class FlatProfiler; // uses both [gs]et_thread_profiler. 1736 friend class FlatProfilerTask; // uses get_thread_profiler. 1737 friend class ThreadProfilerMark; // uses get_thread_profiler. 1738 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } 1739 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { 1740 ThreadProfiler* result = _thread_profiler; 1741 _thread_profiler = tp; 1742 return result; 1743 } 1744 1745 public: 1746 // Returns the running thread as a JavaThread 1747 static inline JavaThread* current(); 1748 1749 // Returns the active Java thread. Do not use this if you know you are calling 1750 // from a JavaThread, as it's slower than JavaThread::current. If called from 1751 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1752 // operation. You may not want that either. 1753 static JavaThread* active(); 1754 1755 inline CompilerThread* as_CompilerThread(); 1756 1757 public: 1758 virtual void run(); 1759 void thread_main_inner(); 1760 1761 private: 1762 // PRIVILEGED STACK 1763 PrivilegedElement* _privileged_stack_top; 1764 GrowableArray<oop>* _array_for_gc; 1765 public: 1766 1767 // Returns the privileged_stack information. 1768 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } 1769 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } 1770 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } 1771 1772 public: 1773 // Thread local information maintained by JVMTI. 1774 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1775 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1776 // getter is used to get this JavaThread's JvmtiThreadState if it has 1777 // one which means NULL can be returned. JvmtiThreadState::state_for() 1778 // is used to get the specified JavaThread's JvmtiThreadState if it has 1779 // one or it allocates a new JvmtiThreadState for the JavaThread and 1780 // returns it. JvmtiThreadState::state_for() will return NULL only if 1781 // the specified JavaThread is exiting. 1782 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1783 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1784 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } 1785 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } 1786 1787 // JVMTI PopFrame support 1788 // Setting and clearing popframe_condition 1789 // All of these enumerated values are bits. popframe_pending 1790 // indicates that a PopFrame() has been requested and not yet been 1791 // completed. popframe_processing indicates that that PopFrame() is in 1792 // the process of being completed. popframe_force_deopt_reexecution_bit 1793 // indicates that special handling is required when returning to a 1794 // deoptimized caller. 1795 enum PopCondition { 1796 popframe_inactive = 0x00, 1797 popframe_pending_bit = 0x01, 1798 popframe_processing_bit = 0x02, 1799 popframe_force_deopt_reexecution_bit = 0x04 1800 }; 1801 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1802 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1803 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1804 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1805 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1806 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1807 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1808 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1809 #ifdef CC_INTERP 1810 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } 1811 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } 1812 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1813 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1814 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1815 #endif 1816 1817 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1818 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1819 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1820 1821 private: 1822 // Saved incoming arguments to popped frame. 1823 // Used only when popped interpreted frame returns to deoptimized frame. 1824 void* _popframe_preserved_args; 1825 int _popframe_preserved_args_size; 1826 1827 public: 1828 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1829 void* popframe_preserved_args(); 1830 ByteSize popframe_preserved_args_size(); 1831 WordSize popframe_preserved_args_size_in_words(); 1832 void popframe_free_preserved_args(); 1833 1834 1835 private: 1836 JvmtiThreadState *_jvmti_thread_state; 1837 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; 1838 1839 // Used by the interpreter in fullspeed mode for frame pop, method 1840 // entry, method exit and single stepping support. This field is 1841 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. 1842 // It can be set to zero asynchronously (i.e., without a VM operation 1843 // or a lock) so we have to be very careful. 1844 int _interp_only_mode; 1845 1846 public: 1847 // used by the interpreter for fullspeed debugging support (see above) 1848 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1849 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1850 int get_interp_only_mode() { return _interp_only_mode; } 1851 void increment_interp_only_mode() { ++_interp_only_mode; } 1852 void decrement_interp_only_mode() { --_interp_only_mode; } 1853 1854 // support for cached flag that indicates whether exceptions need to be posted for this thread 1855 // if this is false, we can avoid deoptimizing when events are thrown 1856 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1857 private: 1858 int _should_post_on_exceptions_flag; 1859 1860 public: 1861 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1862 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1863 1864 private: 1865 ThreadStatistics *_thread_stat; 1866 1867 public: 1868 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1869 1870 // Return a blocker object for which this thread is blocked parking. 1871 oop current_park_blocker(); 1872 1873 private: 1874 static size_t _stack_size_at_create; 1875 1876 public: 1877 static inline size_t stack_size_at_create(void) { 1878 return _stack_size_at_create; 1879 } 1880 static inline void set_stack_size_at_create(size_t value) { 1881 _stack_size_at_create = value; 1882 } 1883 1884 #if INCLUDE_ALL_GCS 1885 // SATB marking queue support 1886 SATBMarkQueue& satb_mark_queue() { return _satb_mark_queue; } 1887 static SATBMarkQueueSet& satb_mark_queue_set() { 1888 return _satb_mark_queue_set; 1889 } 1890 1891 // Dirty card queue support 1892 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } 1893 static DirtyCardQueueSet& dirty_card_queue_set() { 1894 return _dirty_card_queue_set; 1895 } 1896 #endif // INCLUDE_ALL_GCS 1897 1898 // This method initializes the SATB and dirty card queues before a 1899 // JavaThread is added to the Java thread list. Right now, we don't 1900 // have to do anything to the dirty card queue (it should have been 1901 // activated when the thread was created), but we have to activate 1902 // the SATB queue if the thread is created while a marking cycle is 1903 // in progress. The activation / de-activation of the SATB queues at 1904 // the beginning / end of a marking cycle is done during safepoints 1905 // so we have to make sure this method is called outside one to be 1906 // able to safely read the active field of the SATB queue set. Right 1907 // now, it is called just before the thread is added to the Java 1908 // thread list in the Threads::add() method. That method is holding 1909 // the Threads_lock which ensures we are outside a safepoint. We 1910 // cannot do the obvious and set the active field of the SATB queue 1911 // when the thread is created given that, in some cases, safepoints 1912 // might happen between the JavaThread constructor being called and the 1913 // thread being added to the Java thread list (an example of this is 1914 // when the structure for the DestroyJavaVM thread is created). 1915 #if INCLUDE_ALL_GCS 1916 void initialize_queues(); 1917 #else // INCLUDE_ALL_GCS 1918 void initialize_queues() { } 1919 #endif // INCLUDE_ALL_GCS 1920 1921 // Machine dependent stuff 1922 #include OS_CPU_HEADER(thread) 1923 1924 public: 1925 void set_blocked_on_compilation(bool value) { 1926 _blocked_on_compilation = value; 1927 } 1928 1929 bool blocked_on_compilation() { 1930 return _blocked_on_compilation; 1931 } 1932 protected: 1933 bool _blocked_on_compilation; 1934 1935 1936 // JSR166 per-thread parker 1937 private: 1938 Parker* _parker; 1939 public: 1940 Parker* parker() { return _parker; } 1941 1942 // Biased locking support 1943 private: 1944 GrowableArray<MonitorInfo*>* _cached_monitor_info; 1945 public: 1946 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 1947 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 1948 1949 // clearing/querying jni attach status 1950 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1951 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1952 inline void set_done_attaching_via_jni(); 1953 }; 1954 1955 // Inline implementation of JavaThread::current 1956 inline JavaThread* JavaThread::current() { 1957 Thread* thread = Thread::current(); 1958 assert(thread->is_Java_thread(), "just checking"); 1959 return (JavaThread*)thread; 1960 } 1961 1962 inline CompilerThread* JavaThread::as_CompilerThread() { 1963 assert(is_Compiler_thread(), "just checking"); 1964 return (CompilerThread*)this; 1965 } 1966 1967 // Dedicated thread to sweep the code cache 1968 class CodeCacheSweeperThread : public JavaThread { 1969 CompiledMethod* _scanned_compiled_method; // nmethod being scanned by the sweeper 1970 public: 1971 CodeCacheSweeperThread(); 1972 // Track the nmethod currently being scanned by the sweeper 1973 void set_scanned_compiled_method(CompiledMethod* cm) { 1974 assert(_scanned_compiled_method == NULL || cm == NULL, "should reset to NULL before writing a new value"); 1975 _scanned_compiled_method = cm; 1976 } 1977 1978 // Hide sweeper thread from external view. 1979 bool is_hidden_from_external_view() const { return true; } 1980 1981 bool is_Code_cache_sweeper_thread() const { return true; } 1982 1983 // Prevent GC from unloading _scanned_compiled_method 1984 void oops_do(OopClosure* f, CodeBlobClosure* cf); 1985 void nmethods_do(CodeBlobClosure* cf); 1986 }; 1987 1988 // A thread used for Compilation. 1989 class CompilerThread : public JavaThread { 1990 friend class VMStructs; 1991 private: 1992 CompilerCounters* _counters; 1993 1994 ciEnv* _env; 1995 CompileLog* _log; 1996 CompileTask* _task; 1997 CompileQueue* _queue; 1998 BufferBlob* _buffer_blob; 1999 2000 AbstractCompiler* _compiler; 2001 2002 public: 2003 2004 static CompilerThread* current(); 2005 2006 CompilerThread(CompileQueue* queue, CompilerCounters* counters); 2007 2008 bool is_Compiler_thread() const { return true; } 2009 2010 virtual bool can_call_java() const; 2011 2012 // Hide native compiler threads from external view. 2013 bool is_hidden_from_external_view() const { return !can_call_java(); } 2014 2015 void set_compiler(AbstractCompiler* c) { _compiler = c; } 2016 AbstractCompiler* compiler() const { return _compiler; } 2017 2018 CompileQueue* queue() const { return _queue; } 2019 CompilerCounters* counters() const { return _counters; } 2020 2021 // Get/set the thread's compilation environment. 2022 ciEnv* env() { return _env; } 2023 void set_env(ciEnv* env) { _env = env; } 2024 2025 BufferBlob* get_buffer_blob() const { return _buffer_blob; } 2026 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; } 2027 2028 // Get/set the thread's logging information 2029 CompileLog* log() { return _log; } 2030 void init_log(CompileLog* log) { 2031 // Set once, for good. 2032 assert(_log == NULL, "set only once"); 2033 _log = log; 2034 } 2035 2036 #ifndef PRODUCT 2037 private: 2038 IdealGraphPrinter *_ideal_graph_printer; 2039 public: 2040 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } 2041 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } 2042 #endif 2043 2044 // Get/set the thread's current task 2045 CompileTask* task() { return _task; } 2046 void set_task(CompileTask* task) { _task = task; } 2047 }; 2048 2049 inline CompilerThread* CompilerThread::current() { 2050 return JavaThread::current()->as_CompilerThread(); 2051 } 2052 2053 // The active thread queue. It also keeps track of the current used 2054 // thread priorities. 2055 class Threads: AllStatic { 2056 friend class VMStructs; 2057 private: 2058 static JavaThread* _thread_list; 2059 static int _number_of_threads; 2060 static int _number_of_non_daemon_threads; 2061 static int _return_code; 2062 static int _thread_claim_parity; 2063 #ifdef ASSERT 2064 static bool _vm_complete; 2065 #endif 2066 2067 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS); 2068 static void initialize_jsr292_core_classes(TRAPS); 2069 public: 2070 // Thread management 2071 // force_daemon is a concession to JNI, where we may need to add a 2072 // thread to the thread list before allocating its thread object 2073 static void add(JavaThread* p, bool force_daemon = false); 2074 static void remove(JavaThread* p); 2075 static bool includes(JavaThread* p); 2076 static JavaThread* first() { return _thread_list; } 2077 static void threads_do(ThreadClosure* tc); 2078 2079 // Initializes the vm and creates the vm thread 2080 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 2081 static void convert_vm_init_libraries_to_agents(); 2082 static void create_vm_init_libraries(); 2083 static void create_vm_init_agents(); 2084 static void shutdown_vm_agents(); 2085 static bool destroy_vm(); 2086 // Supported VM versions via JNI 2087 // Includes JNI_VERSION_1_1 2088 static jboolean is_supported_jni_version_including_1_1(jint version); 2089 // Does not include JNI_VERSION_1_1 2090 static jboolean is_supported_jni_version(jint version); 2091 2092 // The "thread claim parity" provides a way for threads to be claimed 2093 // by parallel worker tasks. 2094 // 2095 // Each thread contains a a "parity" field. A task will claim the 2096 // thread only if its parity field is the same as the global parity, 2097 // which is updated by calling change_thread_claim_parity(). 2098 // 2099 // For this to work change_thread_claim_parity() needs to be called 2100 // exactly once in sequential code before starting parallel tasks 2101 // that should claim threads. 2102 // 2103 // New threads get their parity set to 0 and change_thread_claim_parity() 2104 // never set the global parity to 0. 2105 static int thread_claim_parity() { return _thread_claim_parity; } 2106 static void change_thread_claim_parity(); 2107 static void assert_all_threads_claimed() NOT_DEBUG_RETURN; 2108 2109 // Apply "f->do_oop" to all root oops in all threads. 2110 // This version may only be called by sequential code. 2111 static void oops_do(OopClosure* f, CodeBlobClosure* cf); 2112 // This version may be called by sequential or parallel code. 2113 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf); 2114 // This creates a list of GCTasks, one per thread. 2115 static void create_thread_roots_tasks(GCTaskQueue* q); 2116 // This creates a list of GCTasks, one per thread, for marking objects. 2117 static void create_thread_roots_marking_tasks(GCTaskQueue* q); 2118 2119 // Apply "f->do_oop" to roots in all threads that 2120 // are part of compiled frames 2121 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); 2122 2123 static void convert_hcode_pointers(); 2124 static void restore_hcode_pointers(); 2125 2126 // Sweeper 2127 static void nmethods_do(CodeBlobClosure* cf); 2128 2129 // RedefineClasses support 2130 static void metadata_do(void f(Metadata*)); 2131 static void metadata_handles_do(void f(Metadata*)); 2132 2133 #ifdef ASSERT 2134 static bool is_vm_complete() { return _vm_complete; } 2135 #endif 2136 2137 // Verification 2138 static void verify(); 2139 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); 2140 static void print(bool print_stacks, bool internal_format) { 2141 // this function is only used by debug.cpp 2142 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); 2143 } 2144 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 2145 static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf, 2146 int buflen, bool* found_current); 2147 static void print_threads_compiling(outputStream* st, char* buf, int buflen); 2148 2149 // Get Java threads that are waiting to enter a monitor. If doLock 2150 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2151 // VM needs to be at a safepoint. 2152 static GrowableArray<JavaThread*>* get_pending_threads(int count, 2153 address monitor, bool doLock); 2154 2155 // Get owning Java thread from the monitor's owner field. If doLock 2156 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2157 // VM needs to be at a safepoint. 2158 static JavaThread *owning_thread_from_monitor_owner(address owner, 2159 bool doLock); 2160 2161 // Number of threads on the active threads list 2162 static int number_of_threads() { return _number_of_threads; } 2163 // Number of non-daemon threads on the active threads list 2164 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 2165 2166 // Deoptimizes all frames tied to marked nmethods 2167 static void deoptimized_wrt_marked_nmethods(); 2168 2169 static JavaThread* find_java_thread_from_java_tid(jlong java_tid); 2170 2171 }; 2172 2173 2174 // Thread iterator 2175 class ThreadClosure: public StackObj { 2176 public: 2177 virtual void do_thread(Thread* thread) = 0; 2178 }; 2179 2180 class SignalHandlerMark: public StackObj { 2181 private: 2182 Thread* _thread; 2183 public: 2184 SignalHandlerMark(Thread* t) { 2185 _thread = t; 2186 if (_thread) _thread->enter_signal_handler(); 2187 } 2188 ~SignalHandlerMark() { 2189 if (_thread) _thread->leave_signal_handler(); 2190 _thread = NULL; 2191 } 2192 }; 2193 2194 2195 #endif // SHARE_VM_RUNTIME_THREAD_HPP