1 /* 2 * Copyright (c) 1997, 2017, 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 "jni.h" 29 #include "gc/shared/threadLocalAllocBuffer.hpp" 30 #include "memory/allocation.hpp" 31 #include "oops/oop.hpp" 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/align.hpp" 48 #include "utilities/exceptions.hpp" 49 #include "utilities/macros.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 ZERO 55 # include "stack_zero.hpp" 56 #endif 57 58 class ThreadSafepointState; 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 _trace_flag = 0x00000004U // call tracing backend 207 }; 208 209 // various suspension related flags - atomically updated 210 // overloaded for async exception checking in check_special_condition_for_native_trans. 211 volatile uint32_t _suspend_flags; 212 213 private: 214 int _num_nested_signal; 215 216 DEBUG_ONLY(bool _suspendible_thread;) 217 218 public: 219 void enter_signal_handler() { _num_nested_signal++; } 220 void leave_signal_handler() { _num_nested_signal--; } 221 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } 222 223 #ifdef ASSERT 224 void set_suspendible_thread() { 225 _suspendible_thread = true; 226 } 227 228 void clear_suspendible_thread() { 229 _suspendible_thread = false; 230 } 231 232 bool is_suspendible_thread() { return _suspendible_thread; } 233 #endif 234 235 private: 236 // Active_handles points to a block of handles 237 JNIHandleBlock* _active_handles; 238 239 // One-element thread local free list 240 JNIHandleBlock* _free_handle_block; 241 242 // Point to the last handle mark 243 HandleMark* _last_handle_mark; 244 245 // The parity of the last strong_roots iteration in which this thread was 246 // claimed as a task. 247 int _oops_do_parity; 248 249 public: 250 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 251 HandleMark* last_handle_mark() const { return _last_handle_mark; } 252 private: 253 254 // debug support for checking if code does allow safepoints or not 255 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on 256 // mutex, or blocking on an object synchronizer (Java locking). 257 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases 258 // If !allow_allocation(), then an assertion failure will happen during allocation 259 // (Hence, !allow_safepoint() => !allow_allocation()). 260 // 261 // The two classes NoSafepointVerifier and No_Allocation_Verifier are used to set these counters. 262 // 263 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen 264 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. 265 266 // Used by SkipGCALot class. 267 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 268 269 friend class NoAllocVerifier; 270 friend class NoSafepointVerifier; 271 friend class PauseNoSafepointVerifier; 272 friend class GCLocker; 273 274 ThreadLocalAllocBuffer _tlab; // Thread-local eden 275 jlong _allocated_bytes; // Cumulative number of bytes allocated on 276 // the Java heap 277 278 mutable TRACE_DATA _trace_data; // Thread-local data for tracing 279 280 ThreadExt _ext; 281 282 int _vm_operation_started_count; // VM_Operation support 283 int _vm_operation_completed_count; // VM_Operation support 284 285 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread 286 // is waiting to lock 287 bool _current_pending_monitor_is_from_java; // locking is from Java code 288 289 // ObjectMonitor on which this thread called Object.wait() 290 ObjectMonitor* _current_waiting_monitor; 291 292 // Private thread-local objectmonitor list - a simple cache organized as a SLL. 293 public: 294 ObjectMonitor* omFreeList; 295 int omFreeCount; // length of omFreeList 296 int omFreeProvision; // reload chunk size 297 ObjectMonitor* omInUseList; // SLL to track monitors in circulation 298 int omInUseCount; // length of omInUseList 299 300 #ifdef ASSERT 301 private: 302 bool _visited_for_critical_count; 303 304 public: 305 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } 306 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } 307 #endif 308 309 public: 310 enum { 311 is_definitely_current_thread = true 312 }; 313 314 // Constructor 315 Thread(); 316 virtual ~Thread(); 317 318 // Manage Thread::current() 319 void initialize_thread_current(); 320 void clear_thread_current(); // TLS cleanup needed before threads terminate 321 322 public: 323 // thread entry point 324 virtual void run(); 325 326 // Testers 327 virtual bool is_VM_thread() const { return false; } 328 virtual bool is_Java_thread() const { return false; } 329 virtual bool is_Compiler_thread() const { return false; } 330 virtual bool is_Code_cache_sweeper_thread() const { return false; } 331 virtual bool is_hidden_from_external_view() const { return false; } 332 virtual bool is_jvmti_agent_thread() const { return false; } 333 // True iff the thread can perform GC operations at a safepoint. 334 // Generally will be true only of VM thread and parallel GC WorkGang 335 // threads. 336 virtual bool is_GC_task_thread() const { return false; } 337 virtual bool is_Watcher_thread() const { return false; } 338 virtual bool is_ConcurrentGC_thread() const { return false; } 339 virtual bool is_Named_thread() const { return false; } 340 virtual bool is_Worker_thread() const { return false; } 341 342 // Can this thread make Java upcalls 343 virtual bool can_call_java() const { return false; } 344 345 // Casts 346 virtual WorkerThread* as_Worker_thread() const { return NULL; } 347 348 virtual char* name() const { return (char*)"Unknown thread"; } 349 350 // Returns the current thread (ASSERTS if NULL) 351 static inline Thread* current(); 352 // Returns the current thread, or NULL if not attached 353 static inline Thread* current_or_null(); 354 // Returns the current thread, or NULL if not attached, and is 355 // safe for use from signal-handlers 356 static inline Thread* current_or_null_safe(); 357 358 // Common thread operations 359 static void set_priority(Thread* thread, ThreadPriority priority); 360 static ThreadPriority get_priority(const Thread* const thread); 361 static void start(Thread* thread); 362 static void interrupt(Thread* thr); 363 static bool is_interrupted(Thread* thr, bool clear_interrupted); 364 365 void set_native_thread_name(const char *name) { 366 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); 367 os::set_native_thread_name(name); 368 } 369 370 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } 371 Monitor* SR_lock() const { return _SR_lock; } 372 373 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } 374 375 inline void set_suspend_flag(SuspendFlags f); 376 inline void clear_suspend_flag(SuspendFlags f); 377 378 inline void set_has_async_exception(); 379 inline void clear_has_async_exception(); 380 381 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } 382 383 inline void set_critical_native_unlock(); 384 inline void clear_critical_native_unlock(); 385 386 inline void set_trace_flag(); 387 inline void clear_trace_flag(); 388 389 // Support for Unhandled Oop detection 390 // Add the field for both, fastdebug and debug, builds to keep 391 // Thread's fields layout the same. 392 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build. 393 #ifdef CHECK_UNHANDLED_OOPS 394 private: 395 UnhandledOops* _unhandled_oops; 396 #elif defined(ASSERT) 397 private: 398 void* _unhandled_oops; 399 #endif 400 #ifdef CHECK_UNHANDLED_OOPS 401 public: 402 UnhandledOops* unhandled_oops() { return _unhandled_oops; } 403 // Mark oop safe for gc. It may be stack allocated but won't move. 404 void allow_unhandled_oop(oop *op) { 405 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); 406 } 407 // Clear oops at safepoint so crashes point to unhandled oop violator 408 void clear_unhandled_oops() { 409 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); 410 } 411 #endif // CHECK_UNHANDLED_OOPS 412 413 public: 414 #ifndef PRODUCT 415 bool skip_gcalot() { return _skip_gcalot; } 416 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 417 #endif 418 419 // Installs a pending exception to be inserted later 420 static void send_async_exception(oop thread_oop, oop java_throwable); 421 422 // Resource area 423 ResourceArea* resource_area() const { return _resource_area; } 424 void set_resource_area(ResourceArea* area) { _resource_area = area; } 425 426 OSThread* osthread() const { return _osthread; } 427 void set_osthread(OSThread* thread) { _osthread = thread; } 428 429 // JNI handle support 430 JNIHandleBlock* active_handles() const { return _active_handles; } 431 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 432 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 433 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 434 435 // Internal handle support 436 HandleArea* handle_area() const { return _handle_area; } 437 void set_handle_area(HandleArea* area) { _handle_area = area; } 438 439 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 440 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 441 442 // Thread-Local Allocation Buffer (TLAB) support 443 ThreadLocalAllocBuffer& tlab() { return _tlab; } 444 void initialize_tlab() { 445 if (UseTLAB) { 446 tlab().initialize(); 447 } 448 } 449 450 jlong allocated_bytes() { return _allocated_bytes; } 451 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 452 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 453 inline jlong cooked_allocated_bytes(); 454 455 TRACE_DEFINE_THREAD_TRACE_DATA_OFFSET; 456 TRACE_DATA* trace_data() const { return &_trace_data; } 457 bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; } 458 459 const ThreadExt& ext() const { return _ext; } 460 ThreadExt& ext() { return _ext; } 461 462 // VM operation support 463 int vm_operation_ticket() { return ++_vm_operation_started_count; } 464 int vm_operation_completed_count() { return _vm_operation_completed_count; } 465 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } 466 467 // For tracking the heavyweight monitor the thread is pending on. 468 ObjectMonitor* current_pending_monitor() { 469 return _current_pending_monitor; 470 } 471 void set_current_pending_monitor(ObjectMonitor* monitor) { 472 _current_pending_monitor = monitor; 473 } 474 void set_current_pending_monitor_is_from_java(bool from_java) { 475 _current_pending_monitor_is_from_java = from_java; 476 } 477 bool current_pending_monitor_is_from_java() { 478 return _current_pending_monitor_is_from_java; 479 } 480 481 // For tracking the ObjectMonitor on which this thread called Object.wait() 482 ObjectMonitor* current_waiting_monitor() { 483 return _current_waiting_monitor; 484 } 485 void set_current_waiting_monitor(ObjectMonitor* monitor) { 486 _current_waiting_monitor = monitor; 487 } 488 489 // GC support 490 // Apply "f->do_oop" to all root oops in "this". 491 // Used by JavaThread::oops_do. 492 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 493 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf); 494 495 // Handles the parallel case for the method below. 496 private: 497 bool claim_oops_do_par_case(int collection_parity); 498 public: 499 // Requires that "collection_parity" is that of the current roots 500 // iteration. If "is_par" is false, sets the parity of "this" to 501 // "collection_parity", and returns "true". If "is_par" is true, 502 // uses an atomic instruction to set the current threads parity to 503 // "collection_parity", if it is not already. Returns "true" iff the 504 // calling thread does the update, this indicates that the calling thread 505 // has claimed the thread's stack as a root groop in the current 506 // collection. 507 bool claim_oops_do(bool is_par, int collection_parity) { 508 if (!is_par) { 509 _oops_do_parity = collection_parity; 510 return true; 511 } else { 512 return claim_oops_do_par_case(collection_parity); 513 } 514 } 515 516 // jvmtiRedefineClasses support 517 void metadata_handles_do(void f(Metadata*)); 518 519 // Used by fast lock support 520 virtual bool is_lock_owned(address adr) const; 521 522 // Check if address is in the stack of the thread (not just for locks). 523 // Warning: the method can only be used on the running thread 524 bool is_in_stack(address adr) const; 525 // Check if address is in the usable part of the stack (excludes protected 526 // guard pages) 527 bool is_in_usable_stack(address adr) const; 528 529 // Sets this thread as starting thread. Returns failure if thread 530 // creation fails due to lack of memory, too many threads etc. 531 bool set_as_starting_thread(); 532 533 protected: 534 // OS data associated with the thread 535 OSThread* _osthread; // Platform-specific thread information 536 537 // Thread local resource area for temporary allocation within the VM 538 ResourceArea* _resource_area; 539 540 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 541 542 // Thread local handle area for allocation of handles within the VM 543 HandleArea* _handle_area; 544 GrowableArray<Metadata*>* _metadata_handles; 545 546 // Support for stack overflow handling, get_thread, etc. 547 address _stack_base; 548 size_t _stack_size; 549 uintptr_t _self_raw_id; // used by get_thread (mutable) 550 int _lgrp_id; 551 552 public: 553 // Stack overflow support 554 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 555 void set_stack_base(address base) { _stack_base = base; } 556 size_t stack_size() const { return _stack_size; } 557 void set_stack_size(size_t size) { _stack_size = size; } 558 address stack_end() const { return stack_base() - stack_size(); } 559 void record_stack_base_and_size(); 560 561 bool on_local_stack(address adr) const { 562 // QQQ this has knowledge of direction, ought to be a stack method 563 return (_stack_base >= adr && adr >= stack_end()); 564 } 565 566 uintptr_t self_raw_id() { return _self_raw_id; } 567 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } 568 569 int lgrp_id() const { return _lgrp_id; } 570 void set_lgrp_id(int value) { _lgrp_id = value; } 571 572 // Printing 573 virtual void print_on(outputStream* st) const; 574 void print() const { print_on(tty); } 575 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 576 void print_value_on(outputStream* st) const; 577 578 // Debug-only code 579 #ifdef ASSERT 580 private: 581 // Deadlock detection support for Mutex locks. List of locks own by thread. 582 Monitor* _owned_locks; 583 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 584 // thus the friendship 585 friend class Mutex; 586 friend class Monitor; 587 588 public: 589 void print_owned_locks_on(outputStream* st) const; 590 void print_owned_locks() const { print_owned_locks_on(tty); } 591 Monitor* owned_locks() const { return _owned_locks; } 592 bool owns_locks() const { return owned_locks() != NULL; } 593 bool owns_locks_but_compiled_lock() const; 594 int oops_do_parity() const { return _oops_do_parity; } 595 596 // Deadlock detection 597 bool allow_allocation() { return _allow_allocation_count == 0; } 598 ResourceMark* current_resource_mark() { return _current_resource_mark; } 599 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 600 #endif 601 602 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; 603 604 private: 605 volatile int _jvmti_env_iteration_count; 606 607 public: 608 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 609 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 610 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 611 612 // Code generation 613 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); } 614 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); } 615 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); } 616 617 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); } 618 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); } 619 620 #define TLAB_FIELD_OFFSET(name) \ 621 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } 622 623 TLAB_FIELD_OFFSET(start) 624 TLAB_FIELD_OFFSET(end) 625 TLAB_FIELD_OFFSET(top) 626 TLAB_FIELD_OFFSET(pf_top) 627 TLAB_FIELD_OFFSET(size) // desired_size 628 TLAB_FIELD_OFFSET(refill_waste_limit) 629 TLAB_FIELD_OFFSET(number_of_refills) 630 TLAB_FIELD_OFFSET(fast_refill_waste) 631 TLAB_FIELD_OFFSET(slow_allocations) 632 633 #undef TLAB_FIELD_OFFSET 634 635 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); } 636 637 public: 638 volatile intptr_t _Stalled; 639 volatile int _TypeTag; 640 ParkEvent * _ParkEvent; // for synchronized() 641 ParkEvent * _SleepEvent; // for Thread.sleep 642 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor 643 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease 644 int NativeSyncRecursion; // diagnostic 645 646 volatile int _OnTrap; // Resume-at IP delta 647 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG 648 jint _hashStateX; // thread-specific hashCode generator state 649 jint _hashStateY; 650 jint _hashStateZ; 651 void * _schedctl; 652 653 654 volatile jint rng[4]; // RNG for spin loop 655 656 // Low-level leaf-lock primitives used to implement synchronization 657 // and native monitor-mutex infrastructure. 658 // Not for general synchronization use. 659 static void SpinAcquire(volatile int * Lock, const char * Name); 660 static void SpinRelease(volatile int * Lock); 661 static void muxAcquire(volatile intptr_t * Lock, const char * Name); 662 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev); 663 static void muxRelease(volatile intptr_t * Lock); 664 }; 665 666 // Inline implementation of Thread::current() 667 inline Thread* Thread::current() { 668 Thread* current = current_or_null(); 669 assert(current != NULL, "Thread::current() called on detached thread"); 670 return current; 671 } 672 673 inline Thread* Thread::current_or_null() { 674 #ifndef USE_LIBRARY_BASED_TLS_ONLY 675 return _thr_current; 676 #else 677 if (ThreadLocalStorage::is_initialized()) { 678 return ThreadLocalStorage::thread(); 679 } 680 return NULL; 681 #endif 682 } 683 684 inline Thread* Thread::current_or_null_safe() { 685 if (ThreadLocalStorage::is_initialized()) { 686 return ThreadLocalStorage::thread(); 687 } 688 return NULL; 689 } 690 691 // Name support for threads. non-JavaThread subclasses with multiple 692 // uniquely named instances should derive from this. 693 class NamedThread: public Thread { 694 friend class VMStructs; 695 enum { 696 max_name_len = 64 697 }; 698 private: 699 char* _name; 700 // log JavaThread being processed by oops_do 701 JavaThread* _processed_thread; 702 uint _gc_id; // The current GC id when a thread takes part in GC 703 704 public: 705 NamedThread(); 706 ~NamedThread(); 707 // May only be called once per thread. 708 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); 709 void initialize_named_thread(); 710 virtual bool is_Named_thread() const { return true; } 711 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } 712 JavaThread *processed_thread() { return _processed_thread; } 713 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } 714 virtual void print_on(outputStream* st) const; 715 716 void set_gc_id(uint gc_id) { _gc_id = gc_id; } 717 uint gc_id() { return _gc_id; } 718 }; 719 720 // Worker threads are named and have an id of an assigned work. 721 class WorkerThread: public NamedThread { 722 private: 723 uint _id; 724 public: 725 WorkerThread() : _id(0) { } 726 virtual bool is_Worker_thread() const { return true; } 727 728 virtual WorkerThread* as_Worker_thread() const { 729 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); 730 return (WorkerThread*) this; 731 } 732 733 void set_id(uint work_id) { _id = work_id; } 734 uint id() const { return _id; } 735 }; 736 737 // A single WatcherThread is used for simulating timer interrupts. 738 class WatcherThread: public Thread { 739 friend class VMStructs; 740 public: 741 virtual void run(); 742 743 private: 744 static WatcherThread* _watcher_thread; 745 746 static bool _startable; 747 // volatile due to at least one lock-free read 748 volatile static bool _should_terminate; 749 public: 750 enum SomeConstants { 751 delay_interval = 10 // interrupt delay in milliseconds 752 }; 753 754 // Constructor 755 WatcherThread(); 756 757 // No destruction allowed 758 ~WatcherThread() { 759 guarantee(false, "WatcherThread deletion must fix the race with VM termination"); 760 } 761 762 // Tester 763 bool is_Watcher_thread() const { return true; } 764 765 // Printing 766 char* name() const { return (char*)"VM Periodic Task Thread"; } 767 void print_on(outputStream* st) const; 768 void unpark(); 769 770 // Returns the single instance of WatcherThread 771 static WatcherThread* watcher_thread() { return _watcher_thread; } 772 773 // Create and start the single instance of WatcherThread, or stop it on shutdown 774 static void start(); 775 static void stop(); 776 // Only allow start once the VM is sufficiently initialized 777 // Otherwise the first task to enroll will trigger the start 778 static void make_startable(); 779 private: 780 int sleep() const; 781 }; 782 783 784 class CompilerThread; 785 786 typedef void (*ThreadFunction)(JavaThread*, TRAPS); 787 788 class JavaThread: public Thread { 789 friend class VMStructs; 790 friend class JVMCIVMStructs; 791 friend class WhiteBox; 792 private: 793 JavaThread* _next; // The next thread in the Threads list 794 oop _threadObj; // The Java level thread object 795 796 #ifdef ASSERT 797 private: 798 int _java_call_counter; 799 800 public: 801 int java_call_counter() { return _java_call_counter; } 802 void inc_java_call_counter() { _java_call_counter++; } 803 void dec_java_call_counter() { 804 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 805 _java_call_counter--; 806 } 807 private: // restore original namespace restriction 808 #endif // ifdef ASSERT 809 810 #ifndef PRODUCT 811 public: 812 enum { 813 jump_ring_buffer_size = 16 814 }; 815 private: // restore original namespace restriction 816 #endif 817 818 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 819 820 ThreadFunction _entry_point; 821 822 JNIEnv _jni_environment; 823 824 // Deopt support 825 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 826 827 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we 828 // transition out of native 829 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized 830 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 831 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 832 // Because deoptimization is lazy we must save jvmti requests to set locals 833 // in compiled frames until we deoptimize and we have an interpreter frame. 834 // This holds the pointer to array (yeah like there might be more than one) of 835 // description of compiled vframes that have locals that need to be updated. 836 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; 837 838 // Handshake value for fixing 6243940. We need a place for the i2c 839 // adapter to store the callee Method*. This value is NEVER live 840 // across a gc point so it does NOT have to be gc'd 841 // The handshake is open ended since we can't be certain that it will 842 // be NULLed. This is because we rarely ever see the race and end up 843 // in handle_wrong_method which is the backend of the handshake. See 844 // code in i2c adapters and handle_wrong_method. 845 846 Method* _callee_target; 847 848 // Used to pass back results to the interpreter or generated code running Java code. 849 oop _vm_result; // oop result is GC-preserved 850 Metadata* _vm_result_2; // non-oop result 851 852 // See ReduceInitialCardMarks: this holds the precise space interval of 853 // the most recent slow path allocation for which compiled code has 854 // elided card-marks for performance along the fast-path. 855 MemRegion _deferred_card_mark; 856 857 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 858 // allocated during deoptimization 859 // and by JNI_MonitorEnter/Exit 860 861 // Async. requests support 862 enum AsyncRequests { 863 _no_async_condition = 0, 864 _async_exception, 865 _async_unsafe_access_error 866 }; 867 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request 868 oop _pending_async_exception; 869 870 // Safepoint support 871 public: // Expose _thread_state for SafeFetchInt() 872 volatile JavaThreadState _thread_state; 873 private: 874 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint 875 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 876 877 // JavaThread termination support 878 enum TerminatedTypes { 879 _not_terminated = 0xDEAD - 2, 880 _thread_exiting, // JavaThread::exit() has been called for this thread 881 _thread_terminated, // JavaThread is removed from thread list 882 _vm_exited // JavaThread is still executing native code, but VM is terminated 883 // only VM_Exit can set _vm_exited 884 }; 885 886 // In general a JavaThread's _terminated field transitions as follows: 887 // 888 // _not_terminated => _thread_exiting => _thread_terminated 889 // 890 // _vm_exited is a special value to cover the case of a JavaThread 891 // executing native code after the VM itself is terminated. 892 volatile TerminatedTypes _terminated; 893 // suspend/resume support 894 volatile bool _suspend_equivalent; // Suspend equivalent condition 895 jint _in_deopt_handler; // count of deoptimization 896 // handlers thread is in 897 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 898 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 899 // never locked) when throwing an exception. Used by interpreter only. 900 901 // JNI attach states: 902 enum JNIAttachStates { 903 _not_attaching_via_jni = 1, // thread is not attaching via JNI 904 _attaching_via_jni, // thread is attaching via JNI 905 _attached_via_jni // thread has attached via JNI 906 }; 907 908 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 909 // A native thread that is attaching via JNI starts with a value 910 // of _attaching_via_jni and transitions to _attached_via_jni. 911 volatile JNIAttachStates _jni_attach_state; 912 913 public: 914 // State of the stack guard pages for this thread. 915 enum StackGuardState { 916 stack_guard_unused, // not needed 917 stack_guard_reserved_disabled, 918 stack_guard_yellow_reserved_disabled,// disabled (temporarily) after stack overflow 919 stack_guard_enabled // enabled 920 }; 921 922 private: 923 924 #if INCLUDE_JVMCI 925 // The _pending_* fields below are used to communicate extra information 926 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. 927 928 // Communicates the DeoptReason and DeoptAction of the uncommon trap 929 int _pending_deoptimization; 930 931 // Specifies whether the uncommon trap is to bci 0 of a synchronized method 932 // before the monitor has been acquired. 933 bool _pending_monitorenter; 934 935 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter 936 bool _pending_transfer_to_interpreter; 937 938 // Guard for re-entrant call to JVMCIRuntime::adjust_comp_level 939 bool _adjusting_comp_level; 940 941 // An object that JVMCI compiled code can use to further describe and 942 // uniquely identify the speculative optimization guarded by the uncommon trap 943 oop _pending_failed_speculation; 944 945 // These fields are mutually exclusive in terms of live ranges. 946 union { 947 // Communicates the pc at which the most recent implicit exception occurred 948 // from the signal handler to a deoptimization stub. 949 address _implicit_exception_pc; 950 951 // Communicates an alternative call target to an i2c stub from a JavaCall . 952 address _alternate_call_target; 953 } _jvmci; 954 955 // Support for high precision, thread sensitive counters in JVMCI compiled code. 956 jlong* _jvmci_counters; 957 958 public: 959 static jlong* _jvmci_old_thread_counters; 960 static void collect_counters(typeArrayOop array); 961 private: 962 #endif // INCLUDE_JVMCI 963 964 StackGuardState _stack_guard_state; 965 966 // Precompute the limit of the stack as used in stack overflow checks. 967 // We load it from here to simplify the stack overflow check in assembly. 968 address _stack_overflow_limit; 969 address _reserved_stack_activation; 970 971 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 972 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 973 // code) 974 volatile oop _exception_oop; // Exception thrown in compiled code 975 volatile address _exception_pc; // PC where exception happened 976 volatile address _exception_handler_pc; // PC for handler of exception 977 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 978 979 private: 980 // support for JNI critical regions 981 jint _jni_active_critical; // count of entries into JNI critical region 982 983 // Checked JNI: function name requires exception check 984 char* _pending_jni_exception_check_fn; 985 986 // For deadlock detection. 987 int _depth_first_number; 988 989 // JVMTI PopFrame support 990 // This is set to popframe_pending to signal that top Java frame should be popped immediately 991 int _popframe_condition; 992 993 // If reallocation of scalar replaced objects fails, we throw OOM 994 // and during exception propagation, pop the top 995 // _frames_to_pop_failed_realloc frames, the ones that reference 996 // failed reallocations. 997 int _frames_to_pop_failed_realloc; 998 999 #ifndef PRODUCT 1000 int _jmp_ring_index; 1001 struct { 1002 // We use intptr_t instead of address so debugger doesn't try and display strings 1003 intptr_t _target; 1004 intptr_t _instruction; 1005 const char* _file; 1006 int _line; 1007 } _jmp_ring[jump_ring_buffer_size]; 1008 #endif // PRODUCT 1009 1010 #if INCLUDE_ALL_GCS 1011 // Support for G1 barriers 1012 1013 SATBMarkQueue _satb_mark_queue; // Thread-local log for SATB barrier. 1014 // Set of all such queues. 1015 static SATBMarkQueueSet _satb_mark_queue_set; 1016 1017 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. 1018 // Set of all such queues. 1019 static DirtyCardQueueSet _dirty_card_queue_set; 1020 1021 void flush_barrier_queues(); 1022 #endif // INCLUDE_ALL_GCS 1023 1024 friend class VMThread; 1025 friend class ThreadWaitTransition; 1026 friend class VM_Exit; 1027 1028 void initialize(); // Initialized the instance variables 1029 1030 public: 1031 // Constructor 1032 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads 1033 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 1034 ~JavaThread(); 1035 1036 #ifdef ASSERT 1037 // verify this JavaThread hasn't be published in the Threads::list yet 1038 void verify_not_published(); 1039 #endif 1040 1041 //JNI functiontable getter/setter for JVMTI jni function table interception API. 1042 void set_jni_functions(struct JNINativeInterface_* functionTable) { 1043 _jni_environment.functions = functionTable; 1044 } 1045 struct JNINativeInterface_* get_jni_functions() { 1046 return (struct JNINativeInterface_ *)_jni_environment.functions; 1047 } 1048 1049 // This function is called at thread creation to allow 1050 // platform specific thread variables to be initialized. 1051 void cache_global_variables(); 1052 1053 // Executes Shutdown.shutdown() 1054 void invoke_shutdown_hooks(); 1055 1056 // Cleanup on thread exit 1057 enum ExitType { 1058 normal_exit, 1059 jni_detach 1060 }; 1061 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 1062 1063 void cleanup_failed_attach_current_thread(); 1064 1065 // Testers 1066 virtual bool is_Java_thread() const { return true; } 1067 virtual bool can_call_java() const { return true; } 1068 1069 // Thread chain operations 1070 JavaThread* next() const { return _next; } 1071 void set_next(JavaThread* p) { _next = p; } 1072 1073 // Thread oop. threadObj() can be NULL for initial JavaThread 1074 // (or for threads attached via JNI) 1075 oop threadObj() const { return _threadObj; } 1076 void set_threadObj(oop p) { _threadObj = p; } 1077 1078 ThreadPriority java_priority() const; // Read from threadObj() 1079 1080 // Prepare thread and add to priority queue. If a priority is 1081 // not specified, use the priority of the thread object. Threads_lock 1082 // must be held while this function is called. 1083 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 1084 void prepare_ext(); 1085 1086 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 1087 address saved_exception_pc() { return _saved_exception_pc; } 1088 1089 1090 ThreadFunction entry_point() const { return _entry_point; } 1091 1092 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1093 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS); 1094 1095 // Last frame anchor routines 1096 1097 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1098 1099 // last_Java_sp 1100 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1101 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1102 1103 // last_Java_pc 1104 1105 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1106 1107 // Safepoint support 1108 #if !(defined(PPC64) || defined(AARCH64)) 1109 JavaThreadState thread_state() const { return _thread_state; } 1110 void set_thread_state(JavaThreadState s) { _thread_state = s; } 1111 #else 1112 // Use membars when accessing volatile _thread_state. See 1113 // Threads::create_vm() for size checks. 1114 inline JavaThreadState thread_state() const; 1115 inline void set_thread_state(JavaThreadState s); 1116 #endif 1117 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } 1118 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } 1119 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } 1120 1121 // thread has called JavaThread::exit() or is terminated 1122 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } 1123 // thread is terminated (no longer on the threads list); we compare 1124 // against the two non-terminated values so that a freed JavaThread 1125 // will also be considered terminated. 1126 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } 1127 void set_terminated(TerminatedTypes t) { _terminated = t; } 1128 // special for Threads::remove() which is static: 1129 void set_terminated_value() { _terminated = _thread_terminated; } 1130 void block_if_vm_exited(); 1131 1132 bool doing_unsafe_access() { return _doing_unsafe_access; } 1133 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1134 1135 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1136 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1137 1138 // Suspend/resume support for JavaThread 1139 private: 1140 inline void set_ext_suspended(); 1141 inline void clear_ext_suspended(); 1142 1143 public: 1144 void java_suspend(); 1145 void java_resume(); 1146 int java_suspend_self(); 1147 1148 void check_and_wait_while_suspended() { 1149 assert(JavaThread::current() == this, "sanity check"); 1150 1151 bool do_self_suspend; 1152 do { 1153 // were we externally suspended while we were waiting? 1154 do_self_suspend = handle_special_suspend_equivalent_condition(); 1155 if (do_self_suspend) { 1156 // don't surprise the thread that suspended us by returning 1157 java_suspend_self(); 1158 set_suspend_equivalent(); 1159 } 1160 } while (do_self_suspend); 1161 } 1162 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); 1163 // Check for async exception in addition to safepoint and suspend request. 1164 static void check_special_condition_for_native_trans(JavaThread *thread); 1165 1166 // Same as check_special_condition_for_native_trans but finishes the 1167 // transition into thread_in_Java mode so that it can potentially 1168 // block. 1169 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); 1170 1171 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); 1172 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { 1173 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1174 // Warning: is_ext_suspend_completed() may temporarily drop the 1175 // SR_lock to allow the thread to reach a stable thread state if 1176 // it is currently in a transient thread state. 1177 return is_ext_suspend_completed(false /* !called_by_wait */, 1178 SuspendRetryDelay, bits); 1179 } 1180 1181 // We cannot allow wait_for_ext_suspend_completion() to run forever or 1182 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally 1183 // passed as the count and delay parameters. Experiments with specific 1184 // calls to wait_for_ext_suspend_completion() can be done by passing 1185 // other values in the code. Experiments with all calls can be done 1186 // via the appropriate -XX options. 1187 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); 1188 1189 inline void set_external_suspend(); 1190 inline void clear_external_suspend(); 1191 1192 inline void set_deopt_suspend(); 1193 inline void clear_deopt_suspend(); 1194 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } 1195 1196 bool is_external_suspend() const { 1197 return (_suspend_flags & _external_suspend) != 0; 1198 } 1199 // Whenever a thread transitions from native to vm/java it must suspend 1200 // if external|deopt suspend is present. 1201 bool is_suspend_after_native() const { 1202 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0; 1203 } 1204 1205 // external suspend request is completed 1206 bool is_ext_suspended() const { 1207 return (_suspend_flags & _ext_suspended) != 0; 1208 } 1209 1210 bool is_external_suspend_with_lock() const { 1211 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1212 return is_external_suspend(); 1213 } 1214 1215 // Special method to handle a pending external suspend request 1216 // when a suspend equivalent condition lifts. 1217 bool handle_special_suspend_equivalent_condition() { 1218 assert(is_suspend_equivalent(), 1219 "should only be called in a suspend equivalence condition"); 1220 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1221 bool ret = is_external_suspend(); 1222 if (!ret) { 1223 // not about to self-suspend so clear suspend equivalence 1224 clear_suspend_equivalent(); 1225 } 1226 // implied else: 1227 // We have a pending external suspend request so we leave the 1228 // suspend_equivalent flag set until java_suspend_self() sets 1229 // the ext_suspended flag and clears the suspend_equivalent 1230 // flag. This insures that wait_for_ext_suspend_completion() 1231 // will return consistent values. 1232 return ret; 1233 } 1234 1235 // utility methods to see if we are doing some kind of suspension 1236 bool is_being_ext_suspended() const { 1237 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1238 return is_ext_suspended() || is_external_suspend(); 1239 } 1240 1241 bool is_suspend_equivalent() const { return _suspend_equivalent; } 1242 1243 void set_suspend_equivalent() { _suspend_equivalent = true; } 1244 void clear_suspend_equivalent() { _suspend_equivalent = false; } 1245 1246 // Thread.stop support 1247 void send_thread_stop(oop throwable); 1248 AsyncRequests clear_special_runtime_exit_condition() { 1249 AsyncRequests x = _special_runtime_exit_condition; 1250 _special_runtime_exit_condition = _no_async_condition; 1251 return x; 1252 } 1253 1254 // Are any async conditions present? 1255 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } 1256 1257 void check_and_handle_async_exceptions(bool check_unsafe_error = true); 1258 1259 // these next two are also used for self-suspension and async exception support 1260 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1261 1262 // Return true if JavaThread has an asynchronous condition or 1263 // if external suspension is requested. 1264 bool has_special_runtime_exit_condition() { 1265 // Because we don't use is_external_suspend_with_lock 1266 // it is possible that we won't see an asynchronous external suspend 1267 // request that has just gotten started, i.e., SR_lock grabbed but 1268 // _external_suspend field change either not made yet or not visible 1269 // yet. However, this is okay because the request is asynchronous and 1270 // we will see the new flag value the next time through. It's also 1271 // possible that the external suspend request is dropped after 1272 // we have checked is_external_suspend(), we will recheck its value 1273 // under SR_lock in java_suspend_self(). 1274 return (_special_runtime_exit_condition != _no_async_condition) || 1275 is_external_suspend() || is_trace_suspend(); 1276 } 1277 1278 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } 1279 1280 inline void set_pending_async_exception(oop e); 1281 1282 // Fast-locking support 1283 bool is_lock_owned(address adr) const; 1284 1285 // Accessors for vframe array top 1286 // The linked list of vframe arrays are sorted on sp. This means when we 1287 // unpack the head must contain the vframe array to unpack. 1288 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1289 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1290 1291 // Side structure for deferring update of java frame locals until deopt occurs 1292 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } 1293 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } 1294 1295 // These only really exist to make debugging deopt problems simpler 1296 1297 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1298 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1299 1300 // The special resourceMark used during deoptimization 1301 1302 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1303 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1304 1305 intptr_t* must_deopt_id() { return _must_deopt_id; } 1306 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } 1307 void clear_must_deopt_id() { _must_deopt_id = NULL; } 1308 1309 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; } 1310 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; } 1311 1312 Method* callee_target() const { return _callee_target; } 1313 void set_callee_target (Method* x) { _callee_target = x; } 1314 1315 // Oop results of vm runtime calls 1316 oop vm_result() const { return _vm_result; } 1317 void set_vm_result (oop x) { _vm_result = x; } 1318 1319 Metadata* vm_result_2() const { return _vm_result_2; } 1320 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1321 1322 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1323 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1324 1325 #if INCLUDE_JVMCI 1326 int pending_deoptimization() const { return _pending_deoptimization; } 1327 oop pending_failed_speculation() const { return _pending_failed_speculation; } 1328 bool adjusting_comp_level() const { return _adjusting_comp_level; } 1329 void set_adjusting_comp_level(bool b) { _adjusting_comp_level = b; } 1330 bool has_pending_monitorenter() const { return _pending_monitorenter; } 1331 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } 1332 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } 1333 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; } 1334 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } 1335 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; } 1336 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; } 1337 #endif // INCLUDE_JVMCI 1338 1339 // Exception handling for compiled methods 1340 oop exception_oop() const { return _exception_oop; } 1341 address exception_pc() const { return _exception_pc; } 1342 address exception_handler_pc() const { return _exception_handler_pc; } 1343 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1344 1345 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); } 1346 void set_exception_pc(address a) { _exception_pc = a; } 1347 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1348 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1349 1350 void clear_exception_oop_and_pc() { 1351 set_exception_oop(NULL); 1352 set_exception_pc(NULL); 1353 } 1354 1355 // Stack overflow support 1356 // 1357 // (small addresses) 1358 // 1359 // -- <-- stack_end() --- 1360 // | | 1361 // | red pages | 1362 // | | 1363 // -- <-- stack_red_zone_base() | 1364 // | | 1365 // | guard 1366 // | yellow pages zone 1367 // | | 1368 // | | 1369 // -- <-- stack_yellow_zone_base() | 1370 // | | 1371 // | | 1372 // | reserved pages | 1373 // | | 1374 // -- <-- stack_reserved_zone_base() --- --- 1375 // /|\ shadow <-- stack_overflow_limit() (somewhere in here) 1376 // | zone 1377 // \|/ size 1378 // some untouched memory --- 1379 // 1380 // 1381 // -- 1382 // | 1383 // | shadow zone 1384 // | 1385 // -- 1386 // x frame n 1387 // -- 1388 // x frame n-1 1389 // x 1390 // -- 1391 // ... 1392 // 1393 // -- 1394 // x frame 0 1395 // -- <-- stack_base() 1396 // 1397 // (large addresses) 1398 // 1399 1400 private: 1401 // These values are derived from flags StackRedPages, StackYellowPages, 1402 // StackReservedPages and StackShadowPages. The zone size is determined 1403 // ergonomically if page_size > 4K. 1404 static size_t _stack_red_zone_size; 1405 static size_t _stack_yellow_zone_size; 1406 static size_t _stack_reserved_zone_size; 1407 static size_t _stack_shadow_zone_size; 1408 public: 1409 inline size_t stack_available(address cur_sp); 1410 1411 static size_t stack_red_zone_size() { 1412 assert(_stack_red_zone_size > 0, "Don't call this before the field is initialized."); 1413 return _stack_red_zone_size; 1414 } 1415 static void set_stack_red_zone_size(size_t s) { 1416 assert(is_aligned(s, os::vm_page_size()), 1417 "We can not protect if the red zone size is not page aligned."); 1418 assert(_stack_red_zone_size == 0, "This should be called only once."); 1419 _stack_red_zone_size = s; 1420 } 1421 address stack_red_zone_base() { 1422 return (address)(stack_end() + stack_red_zone_size()); 1423 } 1424 bool in_stack_red_zone(address a) { 1425 return a <= stack_red_zone_base() && a >= stack_end(); 1426 } 1427 1428 static size_t stack_yellow_zone_size() { 1429 assert(_stack_yellow_zone_size > 0, "Don't call this before the field is initialized."); 1430 return _stack_yellow_zone_size; 1431 } 1432 static void set_stack_yellow_zone_size(size_t s) { 1433 assert(is_aligned(s, os::vm_page_size()), 1434 "We can not protect if the yellow zone size is not page aligned."); 1435 assert(_stack_yellow_zone_size == 0, "This should be called only once."); 1436 _stack_yellow_zone_size = s; 1437 } 1438 1439 static size_t stack_reserved_zone_size() { 1440 // _stack_reserved_zone_size may be 0. This indicates the feature is off. 1441 return _stack_reserved_zone_size; 1442 } 1443 static void set_stack_reserved_zone_size(size_t s) { 1444 assert(is_aligned(s, os::vm_page_size()), 1445 "We can not protect if the reserved zone size is not page aligned."); 1446 assert(_stack_reserved_zone_size == 0, "This should be called only once."); 1447 _stack_reserved_zone_size = s; 1448 } 1449 address stack_reserved_zone_base() { 1450 return (address)(stack_end() + 1451 (stack_red_zone_size() + stack_yellow_zone_size() + stack_reserved_zone_size())); 1452 } 1453 bool in_stack_reserved_zone(address a) { 1454 return (a <= stack_reserved_zone_base()) && 1455 (a >= (address)((intptr_t)stack_reserved_zone_base() - stack_reserved_zone_size())); 1456 } 1457 1458 static size_t stack_yellow_reserved_zone_size() { 1459 return _stack_yellow_zone_size + _stack_reserved_zone_size; 1460 } 1461 bool in_stack_yellow_reserved_zone(address a) { 1462 return (a <= stack_reserved_zone_base()) && (a >= stack_red_zone_base()); 1463 } 1464 1465 // Size of red + yellow + reserved zones. 1466 static size_t stack_guard_zone_size() { 1467 return stack_red_zone_size() + stack_yellow_reserved_zone_size(); 1468 } 1469 1470 static size_t stack_shadow_zone_size() { 1471 assert(_stack_shadow_zone_size > 0, "Don't call this before the field is initialized."); 1472 return _stack_shadow_zone_size; 1473 } 1474 static void set_stack_shadow_zone_size(size_t s) { 1475 // The shadow area is not allocated or protected, so 1476 // it needs not be page aligned. 1477 // But the stack bang currently assumes that it is a 1478 // multiple of page size. This guarantees that the bang 1479 // loop touches all pages in the shadow zone. 1480 // This can be guaranteed differently, as well. E.g., if 1481 // the page size is a multiple of 4K, banging in 4K steps 1482 // suffices to touch all pages. (Some pages are banged 1483 // several times, though.) 1484 assert(is_aligned(s, os::vm_page_size()), 1485 "Stack bang assumes multiple of page size."); 1486 assert(_stack_shadow_zone_size == 0, "This should be called only once."); 1487 _stack_shadow_zone_size = s; 1488 } 1489 1490 void create_stack_guard_pages(); 1491 void remove_stack_guard_pages(); 1492 1493 void enable_stack_reserved_zone(); 1494 void disable_stack_reserved_zone(); 1495 void enable_stack_yellow_reserved_zone(); 1496 void disable_stack_yellow_reserved_zone(); 1497 void enable_stack_red_zone(); 1498 void disable_stack_red_zone(); 1499 1500 inline bool stack_guard_zone_unused(); 1501 inline bool stack_yellow_reserved_zone_disabled(); 1502 inline bool stack_reserved_zone_disabled(); 1503 inline bool stack_guards_enabled(); 1504 1505 address reserved_stack_activation() const { return _reserved_stack_activation; } 1506 void set_reserved_stack_activation(address addr) { 1507 assert(_reserved_stack_activation == stack_base() 1508 || _reserved_stack_activation == NULL 1509 || addr == stack_base(), "Must not be set twice"); 1510 _reserved_stack_activation = addr; 1511 } 1512 1513 // Attempt to reguard the stack after a stack overflow may have occurred. 1514 // Returns true if (a) guard pages are not needed on this thread, (b) the 1515 // pages are already guarded, or (c) the pages were successfully reguarded. 1516 // Returns false if there is not enough stack space to reguard the pages, in 1517 // which case the caller should unwind a frame and try again. The argument 1518 // should be the caller's (approximate) sp. 1519 bool reguard_stack(address cur_sp); 1520 // Similar to above but see if current stackpoint is out of the guard area 1521 // and reguard if possible. 1522 bool reguard_stack(void); 1523 1524 address stack_overflow_limit() { return _stack_overflow_limit; } 1525 void set_stack_overflow_limit() { 1526 _stack_overflow_limit = 1527 stack_end() + MAX2(JavaThread::stack_guard_zone_size(), JavaThread::stack_shadow_zone_size()); 1528 } 1529 1530 // Misc. accessors/mutators 1531 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1532 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1533 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1534 1535 #ifndef PRODUCT 1536 void record_jump(address target, address instr, const char* file, int line); 1537 #endif // PRODUCT 1538 1539 // For assembly stub generation 1540 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } 1541 #ifndef PRODUCT 1542 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); } 1543 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); } 1544 #endif // PRODUCT 1545 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } 1546 static ByteSize pending_jni_exception_check_fn_offset() { 1547 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn); 1548 } 1549 static ByteSize last_Java_sp_offset() { 1550 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1551 } 1552 static ByteSize last_Java_pc_offset() { 1553 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1554 } 1555 static ByteSize frame_anchor_offset() { 1556 return byte_offset_of(JavaThread, _anchor); 1557 } 1558 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } 1559 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } 1560 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } 1561 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } 1562 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } 1563 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } 1564 #if INCLUDE_JVMCI 1565 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); } 1566 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); } 1567 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); } 1568 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); } 1569 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); } 1570 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); } 1571 #endif // INCLUDE_JVMCI 1572 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } 1573 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } 1574 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1575 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } 1576 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1577 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); } 1578 static ByteSize reserved_stack_activation_offset() { return byte_offset_of(JavaThread, _reserved_stack_activation); } 1579 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } 1580 1581 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1582 static ByteSize should_post_on_exceptions_flag_offset() { 1583 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1584 } 1585 1586 #if INCLUDE_ALL_GCS 1587 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } 1588 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } 1589 #endif // INCLUDE_ALL_GCS 1590 1591 // Returns the jni environment for this thread 1592 JNIEnv* jni_environment() { return &_jni_environment; } 1593 1594 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1595 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1596 // Only return NULL if thread is off the thread list; starting to 1597 // exit should not return NULL. 1598 if (thread_from_jni_env->is_terminated()) { 1599 thread_from_jni_env->block_if_vm_exited(); 1600 return NULL; 1601 } else { 1602 return thread_from_jni_env; 1603 } 1604 } 1605 1606 // JNI critical regions. These can nest. 1607 bool in_critical() { return _jni_active_critical > 0; } 1608 bool in_last_critical() { return _jni_active_critical == 1; } 1609 void enter_critical() { 1610 assert(Thread::current() == this || 1611 (Thread::current()->is_VM_thread() && 1612 SafepointSynchronize::is_synchronizing()), 1613 "this must be current thread or synchronizing"); 1614 _jni_active_critical++; 1615 } 1616 void exit_critical() { 1617 assert(Thread::current() == this, "this must be current thread"); 1618 _jni_active_critical--; 1619 assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); 1620 } 1621 1622 // Checked JNI: is the programmer required to check for exceptions, if so specify 1623 // which function name. Returning to a Java frame should implicitly clear the 1624 // pending check, this is done for Native->Java transitions (i.e. user JNI code). 1625 // VM->Java transistions are not cleared, it is expected that JNI code enclosed 1626 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal). 1627 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1628 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1629 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1630 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1631 1632 // For deadlock detection 1633 int depth_first_number() { return _depth_first_number; } 1634 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1635 1636 private: 1637 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1638 1639 public: 1640 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1641 void add_monitor_chunk(MonitorChunk* chunk); 1642 void remove_monitor_chunk(MonitorChunk* chunk); 1643 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1644 void inc_in_deopt_handler() { _in_deopt_handler++; } 1645 void dec_in_deopt_handler() { 1646 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1647 if (_in_deopt_handler > 0) { // robustness 1648 _in_deopt_handler--; 1649 } 1650 } 1651 1652 private: 1653 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1654 1655 public: 1656 1657 // Frame iteration; calls the function f for all frames on the stack 1658 void frames_do(void f(frame*, const RegisterMap*)); 1659 1660 // Memory operations 1661 void oops_do(OopClosure* f, CodeBlobClosure* cf); 1662 1663 // Sweeper operations 1664 virtual void nmethods_do(CodeBlobClosure* cf); 1665 1666 // RedefineClasses Support 1667 void metadata_do(void f(Metadata*)); 1668 1669 // Misc. operations 1670 char* name() const { return (char*)get_thread_name(); } 1671 void print_on(outputStream* st) const; 1672 void print_value(); 1673 void print_thread_state_on(outputStream*) const PRODUCT_RETURN; 1674 void print_thread_state() const PRODUCT_RETURN; 1675 void print_on_error(outputStream* st, char* buf, int buflen) const; 1676 void print_name_on_error(outputStream* st, char* buf, int buflen) const; 1677 void verify(); 1678 const char* get_thread_name() const; 1679 private: 1680 // factor out low-level mechanics for use in both normal and error cases 1681 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1682 public: 1683 const char* get_threadgroup_name() const; 1684 const char* get_parent_name() const; 1685 1686 // Accessing frames 1687 frame last_frame() { 1688 _anchor.make_walkable(this); 1689 return pd_last_frame(); 1690 } 1691 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1692 1693 // Returns method at 'depth' java or native frames down the stack 1694 // Used for security checks 1695 Klass* security_get_caller_class(int depth); 1696 1697 // Print stack trace in external format 1698 void print_stack_on(outputStream* st); 1699 void print_stack() { print_stack_on(tty); } 1700 1701 // Print stack traces in various internal formats 1702 void trace_stack() PRODUCT_RETURN; 1703 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1704 void trace_frames() PRODUCT_RETURN; 1705 void trace_oops() PRODUCT_RETURN; 1706 1707 // Print an annotated view of the stack frames 1708 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1709 void validate_frame_layout() { 1710 print_frame_layout(0, true); 1711 } 1712 1713 // Returns the number of stack frames on the stack 1714 int depth() const; 1715 1716 // Function for testing deoptimization 1717 void deoptimize(); 1718 void make_zombies(); 1719 1720 void deoptimized_wrt_marked_nmethods(); 1721 1722 public: 1723 // Returns the running thread as a JavaThread 1724 static inline JavaThread* current(); 1725 1726 // Returns the active Java thread. Do not use this if you know you are calling 1727 // from a JavaThread, as it's slower than JavaThread::current. If called from 1728 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1729 // operation. You may not want that either. 1730 static JavaThread* active(); 1731 1732 inline CompilerThread* as_CompilerThread(); 1733 1734 public: 1735 virtual void run(); 1736 void thread_main_inner(); 1737 1738 private: 1739 // PRIVILEGED STACK 1740 PrivilegedElement* _privileged_stack_top; 1741 GrowableArray<oop>* _array_for_gc; 1742 public: 1743 1744 // Returns the privileged_stack information. 1745 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } 1746 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } 1747 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } 1748 1749 public: 1750 // Thread local information maintained by JVMTI. 1751 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1752 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1753 // getter is used to get this JavaThread's JvmtiThreadState if it has 1754 // one which means NULL can be returned. JvmtiThreadState::state_for() 1755 // is used to get the specified JavaThread's JvmtiThreadState if it has 1756 // one or it allocates a new JvmtiThreadState for the JavaThread and 1757 // returns it. JvmtiThreadState::state_for() will return NULL only if 1758 // the specified JavaThread is exiting. 1759 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1760 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1761 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } 1762 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } 1763 1764 // JVMTI PopFrame support 1765 // Setting and clearing popframe_condition 1766 // All of these enumerated values are bits. popframe_pending 1767 // indicates that a PopFrame() has been requested and not yet been 1768 // completed. popframe_processing indicates that that PopFrame() is in 1769 // the process of being completed. popframe_force_deopt_reexecution_bit 1770 // indicates that special handling is required when returning to a 1771 // deoptimized caller. 1772 enum PopCondition { 1773 popframe_inactive = 0x00, 1774 popframe_pending_bit = 0x01, 1775 popframe_processing_bit = 0x02, 1776 popframe_force_deopt_reexecution_bit = 0x04 1777 }; 1778 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1779 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1780 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1781 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1782 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1783 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1784 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1785 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1786 #ifdef CC_INTERP 1787 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } 1788 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } 1789 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1790 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1791 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1792 #endif 1793 1794 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1795 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1796 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1797 1798 private: 1799 // Saved incoming arguments to popped frame. 1800 // Used only when popped interpreted frame returns to deoptimized frame. 1801 void* _popframe_preserved_args; 1802 int _popframe_preserved_args_size; 1803 1804 public: 1805 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1806 void* popframe_preserved_args(); 1807 ByteSize popframe_preserved_args_size(); 1808 WordSize popframe_preserved_args_size_in_words(); 1809 void popframe_free_preserved_args(); 1810 1811 1812 private: 1813 JvmtiThreadState *_jvmti_thread_state; 1814 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; 1815 1816 // Used by the interpreter in fullspeed mode for frame pop, method 1817 // entry, method exit and single stepping support. This field is 1818 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. 1819 // It can be set to zero asynchronously (i.e., without a VM operation 1820 // or a lock) so we have to be very careful. 1821 int _interp_only_mode; 1822 1823 public: 1824 // used by the interpreter for fullspeed debugging support (see above) 1825 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1826 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1827 int get_interp_only_mode() { return _interp_only_mode; } 1828 void increment_interp_only_mode() { ++_interp_only_mode; } 1829 void decrement_interp_only_mode() { --_interp_only_mode; } 1830 1831 // support for cached flag that indicates whether exceptions need to be posted for this thread 1832 // if this is false, we can avoid deoptimizing when events are thrown 1833 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1834 private: 1835 int _should_post_on_exceptions_flag; 1836 1837 public: 1838 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1839 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1840 1841 private: 1842 ThreadStatistics *_thread_stat; 1843 1844 public: 1845 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1846 1847 // Return a blocker object for which this thread is blocked parking. 1848 oop current_park_blocker(); 1849 1850 private: 1851 static size_t _stack_size_at_create; 1852 1853 public: 1854 static inline size_t stack_size_at_create(void) { 1855 return _stack_size_at_create; 1856 } 1857 static inline void set_stack_size_at_create(size_t value) { 1858 _stack_size_at_create = value; 1859 } 1860 1861 #if INCLUDE_ALL_GCS 1862 // SATB marking queue support 1863 SATBMarkQueue& satb_mark_queue() { return _satb_mark_queue; } 1864 static SATBMarkQueueSet& satb_mark_queue_set() { 1865 return _satb_mark_queue_set; 1866 } 1867 1868 // Dirty card queue support 1869 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } 1870 static DirtyCardQueueSet& dirty_card_queue_set() { 1871 return _dirty_card_queue_set; 1872 } 1873 #endif // INCLUDE_ALL_GCS 1874 1875 // This method initializes the SATB and dirty card queues before a 1876 // JavaThread is added to the Java thread list. Right now, we don't 1877 // have to do anything to the dirty card queue (it should have been 1878 // activated when the thread was created), but we have to activate 1879 // the SATB queue if the thread is created while a marking cycle is 1880 // in progress. The activation / de-activation of the SATB queues at 1881 // the beginning / end of a marking cycle is done during safepoints 1882 // so we have to make sure this method is called outside one to be 1883 // able to safely read the active field of the SATB queue set. Right 1884 // now, it is called just before the thread is added to the Java 1885 // thread list in the Threads::add() method. That method is holding 1886 // the Threads_lock which ensures we are outside a safepoint. We 1887 // cannot do the obvious and set the active field of the SATB queue 1888 // when the thread is created given that, in some cases, safepoints 1889 // might happen between the JavaThread constructor being called and the 1890 // thread being added to the Java thread list (an example of this is 1891 // when the structure for the DestroyJavaVM thread is created). 1892 #if INCLUDE_ALL_GCS 1893 void initialize_queues(); 1894 #else // INCLUDE_ALL_GCS 1895 void initialize_queues() { } 1896 #endif // INCLUDE_ALL_GCS 1897 1898 // Machine dependent stuff 1899 #include OS_CPU_HEADER(thread) 1900 1901 public: 1902 void set_blocked_on_compilation(bool value) { 1903 _blocked_on_compilation = value; 1904 } 1905 1906 bool blocked_on_compilation() { 1907 return _blocked_on_compilation; 1908 } 1909 protected: 1910 bool _blocked_on_compilation; 1911 1912 1913 // JSR166 per-thread parker 1914 private: 1915 Parker* _parker; 1916 public: 1917 Parker* parker() { return _parker; } 1918 1919 // Biased locking support 1920 private: 1921 GrowableArray<MonitorInfo*>* _cached_monitor_info; 1922 public: 1923 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 1924 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 1925 1926 // clearing/querying jni attach status 1927 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1928 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1929 inline void set_done_attaching_via_jni(); 1930 }; 1931 1932 // Inline implementation of JavaThread::current 1933 inline JavaThread* JavaThread::current() { 1934 Thread* thread = Thread::current(); 1935 assert(thread->is_Java_thread(), "just checking"); 1936 return (JavaThread*)thread; 1937 } 1938 1939 inline CompilerThread* JavaThread::as_CompilerThread() { 1940 assert(is_Compiler_thread(), "just checking"); 1941 return (CompilerThread*)this; 1942 } 1943 1944 // Dedicated thread to sweep the code cache 1945 class CodeCacheSweeperThread : public JavaThread { 1946 CompiledMethod* _scanned_compiled_method; // nmethod being scanned by the sweeper 1947 public: 1948 CodeCacheSweeperThread(); 1949 // Track the nmethod currently being scanned by the sweeper 1950 void set_scanned_compiled_method(CompiledMethod* cm) { 1951 assert(_scanned_compiled_method == NULL || cm == NULL, "should reset to NULL before writing a new value"); 1952 _scanned_compiled_method = cm; 1953 } 1954 1955 // Hide sweeper thread from external view. 1956 bool is_hidden_from_external_view() const { return true; } 1957 1958 bool is_Code_cache_sweeper_thread() const { return true; } 1959 1960 // Prevent GC from unloading _scanned_compiled_method 1961 void oops_do(OopClosure* f, CodeBlobClosure* cf); 1962 void nmethods_do(CodeBlobClosure* cf); 1963 }; 1964 1965 // A thread used for Compilation. 1966 class CompilerThread : public JavaThread { 1967 friend class VMStructs; 1968 private: 1969 CompilerCounters* _counters; 1970 1971 ciEnv* _env; 1972 CompileLog* _log; 1973 CompileTask* _task; 1974 CompileQueue* _queue; 1975 BufferBlob* _buffer_blob; 1976 1977 AbstractCompiler* _compiler; 1978 1979 public: 1980 1981 static CompilerThread* current(); 1982 1983 CompilerThread(CompileQueue* queue, CompilerCounters* counters); 1984 1985 bool is_Compiler_thread() const { return true; } 1986 1987 virtual bool can_call_java() const; 1988 1989 // Hide native compiler threads from external view. 1990 bool is_hidden_from_external_view() const { return !can_call_java(); } 1991 1992 void set_compiler(AbstractCompiler* c) { _compiler = c; } 1993 AbstractCompiler* compiler() const { return _compiler; } 1994 1995 CompileQueue* queue() const { return _queue; } 1996 CompilerCounters* counters() const { return _counters; } 1997 1998 // Get/set the thread's compilation environment. 1999 ciEnv* env() { return _env; } 2000 void set_env(ciEnv* env) { _env = env; } 2001 2002 BufferBlob* get_buffer_blob() const { return _buffer_blob; } 2003 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; } 2004 2005 // Get/set the thread's logging information 2006 CompileLog* log() { return _log; } 2007 void init_log(CompileLog* log) { 2008 // Set once, for good. 2009 assert(_log == NULL, "set only once"); 2010 _log = log; 2011 } 2012 2013 #ifndef PRODUCT 2014 private: 2015 IdealGraphPrinter *_ideal_graph_printer; 2016 public: 2017 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } 2018 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } 2019 #endif 2020 2021 // Get/set the thread's current task 2022 CompileTask* task() { return _task; } 2023 void set_task(CompileTask* task) { _task = task; } 2024 }; 2025 2026 inline CompilerThread* CompilerThread::current() { 2027 return JavaThread::current()->as_CompilerThread(); 2028 } 2029 2030 // The active thread queue. It also keeps track of the current used 2031 // thread priorities. 2032 class Threads: AllStatic { 2033 friend class VMStructs; 2034 private: 2035 static JavaThread* _thread_list; 2036 static int _number_of_threads; 2037 static int _number_of_non_daemon_threads; 2038 static int _return_code; 2039 static int _thread_claim_parity; 2040 #ifdef ASSERT 2041 static bool _vm_complete; 2042 #endif 2043 2044 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS); 2045 static void initialize_jsr292_core_classes(TRAPS); 2046 public: 2047 // Thread management 2048 // force_daemon is a concession to JNI, where we may need to add a 2049 // thread to the thread list before allocating its thread object 2050 static void add(JavaThread* p, bool force_daemon = false); 2051 static void remove(JavaThread* p); 2052 static bool includes(JavaThread* p); 2053 static JavaThread* first() { return _thread_list; } 2054 static void threads_do(ThreadClosure* tc); 2055 static void possibly_parallel_threads_do(bool is_par, ThreadClosure* tc); 2056 2057 // Initializes the vm and creates the vm thread 2058 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 2059 static void convert_vm_init_libraries_to_agents(); 2060 static void create_vm_init_libraries(); 2061 static void create_vm_init_agents(); 2062 static void shutdown_vm_agents(); 2063 static bool destroy_vm(); 2064 // Supported VM versions via JNI 2065 // Includes JNI_VERSION_1_1 2066 static jboolean is_supported_jni_version_including_1_1(jint version); 2067 // Does not include JNI_VERSION_1_1 2068 static jboolean is_supported_jni_version(jint version); 2069 2070 // The "thread claim parity" provides a way for threads to be claimed 2071 // by parallel worker tasks. 2072 // 2073 // Each thread contains a a "parity" field. A task will claim the 2074 // thread only if its parity field is the same as the global parity, 2075 // which is updated by calling change_thread_claim_parity(). 2076 // 2077 // For this to work change_thread_claim_parity() needs to be called 2078 // exactly once in sequential code before starting parallel tasks 2079 // that should claim threads. 2080 // 2081 // New threads get their parity set to 0 and change_thread_claim_parity() 2082 // never set the global parity to 0. 2083 static int thread_claim_parity() { return _thread_claim_parity; } 2084 static void change_thread_claim_parity(); 2085 static void assert_all_threads_claimed() NOT_DEBUG_RETURN; 2086 2087 // Apply "f->do_oop" to all root oops in all threads. 2088 // This version may only be called by sequential code. 2089 static void oops_do(OopClosure* f, CodeBlobClosure* cf); 2090 // This version may be called by sequential or parallel code. 2091 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf); 2092 // This creates a list of GCTasks, one per thread. 2093 static void create_thread_roots_tasks(GCTaskQueue* q); 2094 // This creates a list of GCTasks, one per thread, for marking objects. 2095 static void create_thread_roots_marking_tasks(GCTaskQueue* q); 2096 2097 // Apply "f->do_oop" to roots in all threads that 2098 // are part of compiled frames 2099 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); 2100 2101 static void convert_hcode_pointers(); 2102 static void restore_hcode_pointers(); 2103 2104 // Sweeper 2105 static void nmethods_do(CodeBlobClosure* cf); 2106 2107 // RedefineClasses support 2108 static void metadata_do(void f(Metadata*)); 2109 static void metadata_handles_do(void f(Metadata*)); 2110 2111 #ifdef ASSERT 2112 static bool is_vm_complete() { return _vm_complete; } 2113 #endif 2114 2115 // Verification 2116 static void verify(); 2117 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); 2118 static void print(bool print_stacks, bool internal_format) { 2119 // this function is only used by debug.cpp 2120 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); 2121 } 2122 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 2123 static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf, 2124 int buflen, bool* found_current); 2125 static void print_threads_compiling(outputStream* st, char* buf, int buflen); 2126 2127 // Get Java threads that are waiting to enter a monitor. If doLock 2128 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2129 // VM needs to be at a safepoint. 2130 static GrowableArray<JavaThread*>* get_pending_threads(int count, 2131 address monitor, bool doLock); 2132 2133 // Get owning Java thread from the monitor's owner field. If doLock 2134 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2135 // VM needs to be at a safepoint. 2136 static JavaThread *owning_thread_from_monitor_owner(address owner, 2137 bool doLock); 2138 2139 // Number of threads on the active threads list 2140 static int number_of_threads() { return _number_of_threads; } 2141 // Number of non-daemon threads on the active threads list 2142 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 2143 2144 // Deoptimizes all frames tied to marked nmethods 2145 static void deoptimized_wrt_marked_nmethods(); 2146 2147 static JavaThread* find_java_thread_from_java_tid(jlong java_tid); 2148 2149 }; 2150 2151 2152 // Thread iterator 2153 class ThreadClosure: public StackObj { 2154 public: 2155 virtual void do_thread(Thread* thread) = 0; 2156 }; 2157 2158 class SignalHandlerMark: public StackObj { 2159 private: 2160 Thread* _thread; 2161 public: 2162 SignalHandlerMark(Thread* t) { 2163 _thread = t; 2164 if (_thread) _thread->enter_signal_handler(); 2165 } 2166 ~SignalHandlerMark() { 2167 if (_thread) _thread->leave_signal_handler(); 2168 _thread = NULL; 2169 } 2170 }; 2171 2172 2173 #endif // SHARE_VM_RUNTIME_THREAD_HPP