thread.hpp revision 9737:e286c9ccd58d
1/* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_THREAD_HPP 26#define SHARE_VM_RUNTIME_THREAD_HPP 27 28#include "gc/shared/threadLocalAllocBuffer.hpp" 29#include "memory/allocation.hpp" 30#include "oops/oop.hpp" 31#include "prims/jni.h" 32#include "prims/jvmtiExport.hpp" 33#include "runtime/frame.hpp" 34#include "runtime/javaFrameAnchor.hpp" 35#include "runtime/jniHandles.hpp" 36#include "runtime/mutexLocker.hpp" 37#include "runtime/os.hpp" 38#include "runtime/osThread.hpp" 39#include "runtime/park.hpp" 40#include "runtime/safepoint.hpp" 41#include "runtime/stubRoutines.hpp" 42#include "runtime/threadLocalStorage.hpp" 43#include "runtime/thread_ext.hpp" 44#include "runtime/unhandledOops.hpp" 45#include "trace/traceBackend.hpp" 46#include "trace/traceMacros.hpp" 47#include "utilities/exceptions.hpp" 48#include "utilities/macros.hpp" 49#include "utilities/top.hpp" 50#if INCLUDE_ALL_GCS 51#include "gc/g1/dirtyCardQueue.hpp" 52#include "gc/g1/satbMarkQueue.hpp" 53#endif // INCLUDE_ALL_GCS 54#ifdef TARGET_ARCH_zero 55# include "stack_zero.hpp" 56#endif 57 58class ThreadSafepointState; 59class ThreadProfiler; 60 61class JvmtiThreadState; 62class JvmtiGetLoadedClassesClosure; 63class ThreadStatistics; 64class ConcurrentLocksDump; 65class ParkEvent; 66class Parker; 67 68class ciEnv; 69class CompileThread; 70class CompileLog; 71class CompileTask; 72class CompileQueue; 73class CompilerCounters; 74class vframeArray; 75 76class DeoptResourceMark; 77class jvmtiDeferredLocalVariableSet; 78 79class GCTaskQueue; 80class ThreadClosure; 81class IdealGraphPrinter; 82 83class Metadata; 84template <class T, MEMFLAGS F> class ChunkedList; 85typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer; 86 87DEBUG_ONLY(class ResourceMark;) 88 89class WorkerThread; 90 91// Class hierarchy 92// - Thread 93// - NamedThread 94// - VMThread 95// - ConcurrentGCThread 96// - WorkerThread 97// - GangWorker 98// - GCTaskThread 99// - JavaThread 100// - WatcherThread 101 102class Thread: public ThreadShadow { 103 friend class VMStructs; 104 private: 105 106#ifndef USE_LIBRARY_BASED_TLS_ONLY 107 // Current thread is maintained as a thread-local variable 108 static THREAD_LOCAL_DECL Thread* _thr_current; 109#endif 110 111 // Exception handling 112 // (Note: _pending_exception and friends are in ThreadShadow) 113 //oop _pending_exception; // pending exception for current thread 114 // const char* _exception_file; // file information for exception (debugging only) 115 // int _exception_line; // line information for exception (debugging only) 116 protected: 117 // Support for forcing alignment of thread objects for biased locking 118 void* _real_malloc_address; 119 public: 120 void* operator new(size_t size) throw() { return allocate(size, true); } 121 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 122 return allocate(size, false); } 123 void operator delete(void* p); 124 125 protected: 126 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 127 private: 128 129 // *************************************************************** 130 // Suspend and resume support 131 // *************************************************************** 132 // 133 // VM suspend/resume no longer exists - it was once used for various 134 // things including safepoints but was deprecated and finally removed 135 // in Java 7. Because VM suspension was considered "internal" Java-level 136 // suspension was considered "external", and this legacy naming scheme 137 // remains. 138 // 139 // External suspend/resume requests come from JVM_SuspendThread, 140 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI 141 // ResumeThread. External 142 // suspend requests cause _external_suspend to be set and external 143 // resume requests cause _external_suspend to be cleared. 144 // External suspend requests do not nest on top of other external 145 // suspend requests. The higher level APIs reject suspend requests 146 // for already suspended threads. 147 // 148 // The external_suspend 149 // flag is checked by has_special_runtime_exit_condition() and java thread 150 // will self-suspend when handle_special_runtime_exit_condition() is 151 // called. Most uses of the _thread_blocked state in JavaThreads are 152 // considered the same as being externally suspended; if the blocking 153 // condition lifts, the JavaThread will self-suspend. Other places 154 // where VM checks for external_suspend include: 155 // + mutex granting (do not enter monitors when thread is suspended) 156 // + state transitions from _thread_in_native 157 // 158 // In general, java_suspend() does not wait for an external suspend 159 // request to complete. When it returns, the only guarantee is that 160 // the _external_suspend field is true. 161 // 162 // wait_for_ext_suspend_completion() is used to wait for an external 163 // suspend request to complete. External suspend requests are usually 164 // followed by some other interface call that requires the thread to 165 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into 166 // the interface that requires quiescence, we give the JavaThread a 167 // chance to self-suspend before we need it to be quiescent. This 168 // improves overall suspend/query performance. 169 // 170 // _suspend_flags controls the behavior of java_ suspend/resume. 171 // It must be set under the protection of SR_lock. Read from the flag is 172 // OK without SR_lock as long as the value is only used as a hint. 173 // (e.g., check _external_suspend first without lock and then recheck 174 // inside SR_lock and finish the suspension) 175 // 176 // _suspend_flags is also overloaded for other "special conditions" so 177 // that a single check indicates whether any special action is needed 178 // eg. for async exceptions. 179 // ------------------------------------------------------------------- 180 // Notes: 181 // 1. The suspend/resume logic no longer uses ThreadState in OSThread 182 // but we still update its value to keep other part of the system (mainly 183 // JVMTI) happy. ThreadState is legacy code (see notes in 184 // osThread.hpp). 185 // 186 // 2. It would be more natural if set_external_suspend() is private and 187 // part of java_suspend(), but that probably would affect the suspend/query 188 // performance. Need more investigation on this. 189 190 // suspend/resume lock: used for self-suspend 191 Monitor* _SR_lock; 192 193 protected: 194 enum SuspendFlags { 195 // NOTE: avoid using the sign-bit as cc generates different test code 196 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 197 198 _external_suspend = 0x20000000U, // thread is asked to self suspend 199 _ext_suspended = 0x40000000U, // thread has self-suspended 200 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt 201 202 _has_async_exception = 0x00000001U, // there is a pending async exception 203 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock 204 }; 205 206 // various suspension related flags - atomically updated 207 // overloaded for async exception checking in check_special_condition_for_native_trans. 208 volatile uint32_t _suspend_flags; 209 210 private: 211 int _num_nested_signal; 212 213 DEBUG_ONLY(bool _suspendible_thread;) 214 215 public: 216 void enter_signal_handler() { _num_nested_signal++; } 217 void leave_signal_handler() { _num_nested_signal--; } 218 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } 219 220#ifdef ASSERT 221 void set_suspendible_thread() { 222 _suspendible_thread = true; 223 } 224 225 void clear_suspendible_thread() { 226 _suspendible_thread = false; 227 } 228 229 bool is_suspendible_thread() { return _suspendible_thread; } 230#endif 231 232 private: 233 // Active_handles points to a block of handles 234 JNIHandleBlock* _active_handles; 235 236 // One-element thread local free list 237 JNIHandleBlock* _free_handle_block; 238 239 // Point to the last handle mark 240 HandleMark* _last_handle_mark; 241 242 // The parity of the last strong_roots iteration in which this thread was 243 // claimed as a task. 244 jint _oops_do_parity; 245 246 public: 247 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 248 HandleMark* last_handle_mark() const { return _last_handle_mark; } 249 private: 250 251 // debug support for checking if code does allow safepoints or not 252 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on 253 // mutex, or blocking on an object synchronizer (Java locking). 254 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases 255 // If !allow_allocation(), then an assertion failure will happen during allocation 256 // (Hence, !allow_safepoint() => !allow_allocation()). 257 // 258 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. 259 // 260 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen 261 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. 262 263 // Used by SkipGCALot class. 264 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 265 266 friend class No_Alloc_Verifier; 267 friend class No_Safepoint_Verifier; 268 friend class Pause_No_Safepoint_Verifier; 269 friend class GC_locker; 270 271 ThreadLocalAllocBuffer _tlab; // Thread-local eden 272 jlong _allocated_bytes; // Cumulative number of bytes allocated on 273 // the Java heap 274 275 mutable TRACE_DATA _trace_data; // Thread-local data for tracing 276 277 ThreadExt _ext; 278 279 int _vm_operation_started_count; // VM_Operation support 280 int _vm_operation_completed_count; // VM_Operation support 281 282 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread 283 // is waiting to lock 284 bool _current_pending_monitor_is_from_java; // locking is from Java code 285 286 // ObjectMonitor on which this thread called Object.wait() 287 ObjectMonitor* _current_waiting_monitor; 288 289 // Private thread-local objectmonitor list - a simple cache organized as a SLL. 290 public: 291 ObjectMonitor* omFreeList; 292 int omFreeCount; // length of omFreeList 293 int omFreeProvision; // reload chunk size 294 ObjectMonitor* omInUseList; // SLL to track monitors in circulation 295 int omInUseCount; // length of omInUseList 296 297#ifdef ASSERT 298 private: 299 bool _visited_for_critical_count; 300 301 public: 302 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } 303 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } 304#endif 305 306 public: 307 enum { 308 is_definitely_current_thread = true 309 }; 310 311 // Constructor 312 Thread(); 313 virtual ~Thread(); 314 315 // Manage Thread::current() 316 void initialize_thread_current(); 317 private: 318 void clear_thread_current(); // needed for detaching JNI threads 319 320 public: 321 // thread entry point 322 virtual void run(); 323 324 // Testers 325 virtual bool is_VM_thread() const { return false; } 326 virtual bool is_Java_thread() const { return false; } 327 virtual bool is_Compiler_thread() const { return false; } 328 virtual bool is_Code_cache_sweeper_thread() const { return false; } 329 virtual bool is_hidden_from_external_view() const { return false; } 330 virtual bool is_jvmti_agent_thread() const { return false; } 331 // True iff the thread can perform GC operations at a safepoint. 332 // Generally will be true only of VM thread and parallel GC WorkGang 333 // threads. 334 virtual bool is_GC_task_thread() const { return false; } 335 virtual bool is_Watcher_thread() const { return false; } 336 virtual bool is_ConcurrentGC_thread() const { return false; } 337 virtual bool is_Named_thread() const { return false; } 338 virtual bool is_Worker_thread() const { return false; } 339 340 // Can this thread make Java upcalls 341 virtual bool can_call_java() const { return false; } 342 343 // Casts 344 virtual WorkerThread* as_Worker_thread() const { return NULL; } 345 346 virtual char* name() const { return (char*)"Unknown thread"; } 347 348 // Returns the current thread (ASSERTS if NULL) 349 static inline Thread* current(); 350 // Returns the current thread, or NULL if not attached 351 static inline Thread* current_or_null(); 352 // Returns the current thread, or NULL if not attached, and is 353 // safe for use from signal-handlers 354 static inline Thread* current_or_null_safe(); 355 356 // Common thread operations 357 static void set_priority(Thread* thread, ThreadPriority priority); 358 static ThreadPriority get_priority(const Thread* const thread); 359 static void start(Thread* thread); 360 static void interrupt(Thread* thr); 361 static bool is_interrupted(Thread* thr, bool clear_interrupted); 362 363 void set_native_thread_name(const char *name) { 364 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); 365 os::set_native_thread_name(name); 366 } 367 368 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } 369 Monitor* SR_lock() const { return _SR_lock; } 370 371 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } 372 373 inline void set_suspend_flag(SuspendFlags f); 374 inline void clear_suspend_flag(SuspendFlags f); 375 376 inline void set_has_async_exception(); 377 inline void clear_has_async_exception(); 378 379 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } 380 381 inline void set_critical_native_unlock(); 382 inline void clear_critical_native_unlock(); 383 384 // Support for Unhandled Oop detection 385 // Add the field for both, fastdebug and debug, builds to keep 386 // Thread's fields layout the same. 387 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build. 388#ifdef CHECK_UNHANDLED_OOPS 389 private: 390 UnhandledOops* _unhandled_oops; 391#elif defined(ASSERT) 392 private: 393 void* _unhandled_oops; 394#endif 395#ifdef CHECK_UNHANDLED_OOPS 396 public: 397 UnhandledOops* unhandled_oops() { return _unhandled_oops; } 398 // Mark oop safe for gc. It may be stack allocated but won't move. 399 void allow_unhandled_oop(oop *op) { 400 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); 401 } 402 // Clear oops at safepoint so crashes point to unhandled oop violator 403 void clear_unhandled_oops() { 404 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); 405 } 406#endif // CHECK_UNHANDLED_OOPS 407 408 public: 409#ifndef PRODUCT 410 bool skip_gcalot() { return _skip_gcalot; } 411 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 412#endif 413 414 // Installs a pending exception to be inserted later 415 static void send_async_exception(oop thread_oop, oop java_throwable); 416 417 // Resource area 418 ResourceArea* resource_area() const { return _resource_area; } 419 void set_resource_area(ResourceArea* area) { _resource_area = area; } 420 421 OSThread* osthread() const { return _osthread; } 422 void set_osthread(OSThread* thread) { _osthread = thread; } 423 424 // JNI handle support 425 JNIHandleBlock* active_handles() const { return _active_handles; } 426 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 427 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 428 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 429 430 // Internal handle support 431 HandleArea* handle_area() const { return _handle_area; } 432 void set_handle_area(HandleArea* area) { _handle_area = area; } 433 434 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 435 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 436 437 // Thread-Local Allocation Buffer (TLAB) support 438 ThreadLocalAllocBuffer& tlab() { return _tlab; } 439 void initialize_tlab() { 440 if (UseTLAB) { 441 tlab().initialize(); 442 } 443 } 444 445 jlong allocated_bytes() { return _allocated_bytes; } 446 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 447 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 448 inline jlong cooked_allocated_bytes(); 449 450 TRACE_DATA* trace_data() { return &_trace_data; } 451 452 const ThreadExt& ext() const { return _ext; } 453 ThreadExt& ext() { return _ext; } 454 455 // VM operation support 456 int vm_operation_ticket() { return ++_vm_operation_started_count; } 457 int vm_operation_completed_count() { return _vm_operation_completed_count; } 458 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } 459 460 // For tracking the heavyweight monitor the thread is pending on. 461 ObjectMonitor* current_pending_monitor() { 462 return _current_pending_monitor; 463 } 464 void set_current_pending_monitor(ObjectMonitor* monitor) { 465 _current_pending_monitor = monitor; 466 } 467 void set_current_pending_monitor_is_from_java(bool from_java) { 468 _current_pending_monitor_is_from_java = from_java; 469 } 470 bool current_pending_monitor_is_from_java() { 471 return _current_pending_monitor_is_from_java; 472 } 473 474 // For tracking the ObjectMonitor on which this thread called Object.wait() 475 ObjectMonitor* current_waiting_monitor() { 476 return _current_waiting_monitor; 477 } 478 void set_current_waiting_monitor(ObjectMonitor* monitor) { 479 _current_waiting_monitor = monitor; 480 } 481 482 // GC support 483 // Apply "f->do_oop" to all root oops in "this". 484 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive. 485 // Used by JavaThread::oops_do. 486 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 487 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 488 489 // Handles the parallel case for the method below. 490 private: 491 bool claim_oops_do_par_case(int collection_parity); 492 public: 493 // Requires that "collection_parity" is that of the current roots 494 // iteration. If "is_par" is false, sets the parity of "this" to 495 // "collection_parity", and returns "true". If "is_par" is true, 496 // uses an atomic instruction to set the current threads parity to 497 // "collection_parity", if it is not already. Returns "true" iff the 498 // calling thread does the update, this indicates that the calling thread 499 // has claimed the thread's stack as a root groop in the current 500 // collection. 501 bool claim_oops_do(bool is_par, int collection_parity) { 502 if (!is_par) { 503 _oops_do_parity = collection_parity; 504 return true; 505 } else { 506 return claim_oops_do_par_case(collection_parity); 507 } 508 } 509 510 // Sweeper support 511 void nmethods_do(CodeBlobClosure* cf); 512 513 // jvmtiRedefineClasses support 514 void metadata_handles_do(void f(Metadata*)); 515 516 // Used by fast lock support 517 virtual bool is_lock_owned(address adr) const; 518 519 // Check if address is in the stack of the thread (not just for locks). 520 // Warning: the method can only be used on the running thread 521 bool is_in_stack(address adr) const; 522 // Check if address is in the usable part of the stack (excludes protected 523 // guard pages) 524 bool is_in_usable_stack(address adr) const; 525 526 // Sets this thread as starting thread. Returns failure if thread 527 // creation fails due to lack of memory, too many threads etc. 528 bool set_as_starting_thread(); 529 530protected: 531 // OS data associated with the thread 532 OSThread* _osthread; // Platform-specific thread information 533 534 // Thread local resource area for temporary allocation within the VM 535 ResourceArea* _resource_area; 536 537 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 538 539 // Thread local handle area for allocation of handles within the VM 540 HandleArea* _handle_area; 541 GrowableArray<Metadata*>* _metadata_handles; 542 543 // Support for stack overflow handling, get_thread, etc. 544 address _stack_base; 545 size_t _stack_size; 546 uintptr_t _self_raw_id; // used by get_thread (mutable) 547 int _lgrp_id; 548 549 public: 550 // Stack overflow support 551 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 552 553 void set_stack_base(address base) { _stack_base = base; } 554 size_t stack_size() const { return _stack_size; } 555 void set_stack_size(size_t size) { _stack_size = size; } 556 void record_stack_base_and_size(); 557 558 bool on_local_stack(address adr) const { 559 // QQQ this has knowledge of direction, ought to be a stack method 560 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); 561 } 562 563 uintptr_t self_raw_id() { return _self_raw_id; } 564 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } 565 566 int lgrp_id() const { return _lgrp_id; } 567 void set_lgrp_id(int value) { _lgrp_id = value; } 568 569 // Printing 570 virtual void print_on(outputStream* st) const; 571 void print() const { print_on(tty); } 572 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 573 574 // Debug-only code 575#ifdef ASSERT 576 private: 577 // Deadlock detection support for Mutex locks. List of locks own by thread. 578 Monitor* _owned_locks; 579 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 580 // thus the friendship 581 friend class Mutex; 582 friend class Monitor; 583 584 public: 585 void print_owned_locks_on(outputStream* st) const; 586 void print_owned_locks() const { print_owned_locks_on(tty); } 587 Monitor* owned_locks() const { return _owned_locks; } 588 bool owns_locks() const { return owned_locks() != NULL; } 589 bool owns_locks_but_compiled_lock() const; 590 int oops_do_parity() const { return _oops_do_parity; } 591 592 // Deadlock detection 593 bool allow_allocation() { return _allow_allocation_count == 0; } 594 ResourceMark* current_resource_mark() { return _current_resource_mark; } 595 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 596#endif 597 598 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; 599 600 private: 601 volatile int _jvmti_env_iteration_count; 602 603 public: 604 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 605 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 606 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 607 608 // Code generation 609 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); } 610 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); } 611 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); } 612 613 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); } 614 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); } 615 616#define TLAB_FIELD_OFFSET(name) \ 617 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } 618 619 TLAB_FIELD_OFFSET(start) 620 TLAB_FIELD_OFFSET(end) 621 TLAB_FIELD_OFFSET(top) 622 TLAB_FIELD_OFFSET(pf_top) 623 TLAB_FIELD_OFFSET(size) // desired_size 624 TLAB_FIELD_OFFSET(refill_waste_limit) 625 TLAB_FIELD_OFFSET(number_of_refills) 626 TLAB_FIELD_OFFSET(fast_refill_waste) 627 TLAB_FIELD_OFFSET(slow_allocations) 628 629#undef TLAB_FIELD_OFFSET 630 631 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); } 632 633 public: 634 volatile intptr_t _Stalled; 635 volatile int _TypeTag; 636 ParkEvent * _ParkEvent; // for synchronized() 637 ParkEvent * _SleepEvent; // for Thread.sleep 638 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor 639 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease 640 int NativeSyncRecursion; // diagnostic 641 642 volatile int _OnTrap; // Resume-at IP delta 643 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG 644 jint _hashStateX; // thread-specific hashCode generator state 645 jint _hashStateY; 646 jint _hashStateZ; 647 void * _schedctl; 648 649 650 volatile jint rng[4]; // RNG for spin loop 651 652 // Low-level leaf-lock primitives used to implement synchronization 653 // and native monitor-mutex infrastructure. 654 // Not for general synchronization use. 655 static void SpinAcquire(volatile int * Lock, const char * Name); 656 static void SpinRelease(volatile int * Lock); 657 static void muxAcquire(volatile intptr_t * Lock, const char * Name); 658 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev); 659 static void muxRelease(volatile intptr_t * Lock); 660}; 661 662// Inline implementation of Thread::current() 663inline Thread* Thread::current() { 664 Thread* current = current_or_null(); 665 assert(current != NULL, "Thread::current() called on detached thread"); 666 return current; 667} 668 669inline Thread* Thread::current_or_null() { 670#ifndef USE_LIBRARY_BASED_TLS_ONLY 671 return _thr_current; 672#else 673 return ThreadLocalStorage::thread(); 674#endif 675} 676 677inline Thread* Thread::current_or_null_safe() { 678 return ThreadLocalStorage::thread(); 679} 680 681// Name support for threads. non-JavaThread subclasses with multiple 682// uniquely named instances should derive from this. 683class NamedThread: public Thread { 684 friend class VMStructs; 685 enum { 686 max_name_len = 64 687 }; 688 private: 689 char* _name; 690 // log JavaThread being processed by oops_do 691 JavaThread* _processed_thread; 692 uint _gc_id; // The current GC id when a thread takes part in GC 693 694 public: 695 NamedThread(); 696 ~NamedThread(); 697 // May only be called once per thread. 698 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); 699 void initialize_named_thread(); 700 virtual bool is_Named_thread() const { return true; } 701 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } 702 JavaThread *processed_thread() { return _processed_thread; } 703 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } 704 virtual void print_on(outputStream* st) const; 705 706 void set_gc_id(uint gc_id) { _gc_id = gc_id; } 707 uint gc_id() { return _gc_id; } 708}; 709 710// Worker threads are named and have an id of an assigned work. 711class WorkerThread: public NamedThread { 712 private: 713 uint _id; 714 public: 715 WorkerThread() : _id(0) { } 716 virtual bool is_Worker_thread() const { return true; } 717 718 virtual WorkerThread* as_Worker_thread() const { 719 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); 720 return (WorkerThread*) this; 721 } 722 723 void set_id(uint work_id) { _id = work_id; } 724 uint id() const { return _id; } 725}; 726 727// A single WatcherThread is used for simulating timer interrupts. 728class WatcherThread: public Thread { 729 friend class VMStructs; 730 public: 731 virtual void run(); 732 733 private: 734 static WatcherThread* _watcher_thread; 735 736 static bool _startable; 737 // volatile due to at least one lock-free read 738 volatile static bool _should_terminate; 739 740 os::WatcherThreadCrashProtection* _crash_protection; 741 public: 742 enum SomeConstants { 743 delay_interval = 10 // interrupt delay in milliseconds 744 }; 745 746 // Constructor 747 WatcherThread(); 748 749 // Tester 750 bool is_Watcher_thread() const { return true; } 751 752 // Printing 753 char* name() const { return (char*)"VM Periodic Task Thread"; } 754 void print_on(outputStream* st) const; 755 void unpark(); 756 757 // Returns the single instance of WatcherThread 758 static WatcherThread* watcher_thread() { return _watcher_thread; } 759 760 // Create and start the single instance of WatcherThread, or stop it on shutdown 761 static void start(); 762 static void stop(); 763 // Only allow start once the VM is sufficiently initialized 764 // Otherwise the first task to enroll will trigger the start 765 static void make_startable(); 766 767 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) { 768 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread"); 769 _crash_protection = crash_protection; 770 } 771 772 bool has_crash_protection() const { return _crash_protection != NULL; } 773 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; } 774 775 private: 776 int sleep() const; 777}; 778 779 780class CompilerThread; 781 782typedef void (*ThreadFunction)(JavaThread*, TRAPS); 783 784class JavaThread: public Thread { 785 friend class VMStructs; 786 friend class WhiteBox; 787 private: 788 JavaThread* _next; // The next thread in the Threads list 789 oop _threadObj; // The Java level thread object 790 791#ifdef ASSERT 792 private: 793 int _java_call_counter; 794 795 public: 796 int java_call_counter() { return _java_call_counter; } 797 void inc_java_call_counter() { _java_call_counter++; } 798 void dec_java_call_counter() { 799 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 800 _java_call_counter--; 801 } 802 private: // restore original namespace restriction 803#endif // ifdef ASSERT 804 805#ifndef PRODUCT 806 public: 807 enum { 808 jump_ring_buffer_size = 16 809 }; 810 private: // restore original namespace restriction 811#endif 812 813 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 814 815 ThreadFunction _entry_point; 816 817 JNIEnv _jni_environment; 818 819 // Deopt support 820 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 821 822 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we 823 // transition out of native 824 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized 825 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 826 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 827 // Because deoptimization is lazy we must save jvmti requests to set locals 828 // in compiled frames until we deoptimize and we have an interpreter frame. 829 // This holds the pointer to array (yeah like there might be more than one) of 830 // description of compiled vframes that have locals that need to be updated. 831 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; 832 833 // Handshake value for fixing 6243940. We need a place for the i2c 834 // adapter to store the callee Method*. This value is NEVER live 835 // across a gc point so it does NOT have to be gc'd 836 // The handshake is open ended since we can't be certain that it will 837 // be NULLed. This is because we rarely ever see the race and end up 838 // in handle_wrong_method which is the backend of the handshake. See 839 // code in i2c adapters and handle_wrong_method. 840 841 Method* _callee_target; 842 843 // Used to pass back results to the interpreter or generated code running Java code. 844 oop _vm_result; // oop result is GC-preserved 845 Metadata* _vm_result_2; // non-oop result 846 847 // See ReduceInitialCardMarks: this holds the precise space interval of 848 // the most recent slow path allocation for which compiled code has 849 // elided card-marks for performance along the fast-path. 850 MemRegion _deferred_card_mark; 851 852 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 853 // allocated during deoptimization 854 // and by JNI_MonitorEnter/Exit 855 856 // Async. requests support 857 enum AsyncRequests { 858 _no_async_condition = 0, 859 _async_exception, 860 _async_unsafe_access_error 861 }; 862 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request 863 oop _pending_async_exception; 864 865 // Safepoint support 866 public: // Expose _thread_state for SafeFetchInt() 867 volatile JavaThreadState _thread_state; 868 private: 869 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint 870 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 871 872 // JavaThread termination support 873 enum TerminatedTypes { 874 _not_terminated = 0xDEAD - 2, 875 _thread_exiting, // JavaThread::exit() has been called for this thread 876 _thread_terminated, // JavaThread is removed from thread list 877 _vm_exited // JavaThread is still executing native code, but VM is terminated 878 // only VM_Exit can set _vm_exited 879 }; 880 881 // In general a JavaThread's _terminated field transitions as follows: 882 // 883 // _not_terminated => _thread_exiting => _thread_terminated 884 // 885 // _vm_exited is a special value to cover the case of a JavaThread 886 // executing native code after the VM itself is terminated. 887 volatile TerminatedTypes _terminated; 888 // suspend/resume support 889 volatile bool _suspend_equivalent; // Suspend equivalent condition 890 jint _in_deopt_handler; // count of deoptimization 891 // handlers thread is in 892 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 893 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 894 // never locked) when throwing an exception. Used by interpreter only. 895 896 // JNI attach states: 897 enum JNIAttachStates { 898 _not_attaching_via_jni = 1, // thread is not attaching via JNI 899 _attaching_via_jni, // thread is attaching via JNI 900 _attached_via_jni // thread has attached via JNI 901 }; 902 903 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 904 // A native thread that is attaching via JNI starts with a value 905 // of _attaching_via_jni and transitions to _attached_via_jni. 906 volatile JNIAttachStates _jni_attach_state; 907 908 public: 909 // State of the stack guard pages for this thread. 910 enum StackGuardState { 911 stack_guard_unused, // not needed 912 stack_guard_reserved_disabled, 913 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow 914 stack_guard_enabled // enabled 915 }; 916 917 private: 918 919#if INCLUDE_JVMCI 920 // The _pending_* fields below are used to communicate extra information 921 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. 922 923 // Communicates the DeoptReason and DeoptAction of the uncommon trap 924 int _pending_deoptimization; 925 926 // Specifies whether the uncommon trap is to bci 0 of a synchronized method 927 // before the monitor has been acquired. 928 bool _pending_monitorenter; 929 930 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter 931 bool _pending_transfer_to_interpreter; 932 933 // An object that JVMCI compiled code can use to further describe and 934 // uniquely identify the speculative optimization guarded by the uncommon trap 935 oop _pending_failed_speculation; 936 937 // These fields are mutually exclusive in terms of live ranges. 938 union { 939 // Communicates the pc at which the most recent implicit exception occurred 940 // from the signal handler to a deoptimization stub. 941 address _implicit_exception_pc; 942 943 // Communicates an alternative call target to an i2c stub from a JavaCall . 944 address _alternate_call_target; 945 } _jvmci; 946 947 // Support for high precision, thread sensitive counters in JVMCI compiled code. 948 jlong* _jvmci_counters; 949 950 public: 951 static jlong* _jvmci_old_thread_counters; 952 static void collect_counters(typeArrayOop array); 953 private: 954#endif // INCLUDE_JVMCI 955 956 StackGuardState _stack_guard_state; 957 958 // Precompute the limit of the stack as used in stack overflow checks. 959 // We load it from here to simplify the stack overflow check in assembly. 960 address _stack_overflow_limit; 961 address _reserved_stack_activation; 962 963 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 964 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 965 // code) 966 volatile oop _exception_oop; // Exception thrown in compiled code 967 volatile address _exception_pc; // PC where exception happened 968 volatile address _exception_handler_pc; // PC for handler of exception 969 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 970 971 private: 972 // support for JNI critical regions 973 jint _jni_active_critical; // count of entries into JNI critical region 974 975 // Checked JNI: function name requires exception check 976 char* _pending_jni_exception_check_fn; 977 978 // For deadlock detection. 979 int _depth_first_number; 980 981 // JVMTI PopFrame support 982 // This is set to popframe_pending to signal that top Java frame should be popped immediately 983 int _popframe_condition; 984 985 // If reallocation of scalar replaced objects fails, we throw OOM 986 // and during exception propagation, pop the top 987 // _frames_to_pop_failed_realloc frames, the ones that reference 988 // failed reallocations. 989 int _frames_to_pop_failed_realloc; 990 991#ifndef PRODUCT 992 int _jmp_ring_index; 993 struct { 994 // We use intptr_t instead of address so debugger doesn't try and display strings 995 intptr_t _target; 996 intptr_t _instruction; 997 const char* _file; 998 int _line; 999 } _jmp_ring[jump_ring_buffer_size]; 1000#endif // PRODUCT 1001 1002#if INCLUDE_ALL_GCS 1003 // Support for G1 barriers 1004 1005 SATBMarkQueue _satb_mark_queue; // Thread-local log for SATB barrier. 1006 // Set of all such queues. 1007 static SATBMarkQueueSet _satb_mark_queue_set; 1008 1009 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. 1010 // Set of all such queues. 1011 static DirtyCardQueueSet _dirty_card_queue_set; 1012 1013 void flush_barrier_queues(); 1014#endif // INCLUDE_ALL_GCS 1015 1016 friend class VMThread; 1017 friend class ThreadWaitTransition; 1018 friend class VM_Exit; 1019 1020 void initialize(); // Initialized the instance variables 1021 1022 public: 1023 // Constructor 1024 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads 1025 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 1026 ~JavaThread(); 1027 1028#ifdef ASSERT 1029 // verify this JavaThread hasn't be published in the Threads::list yet 1030 void verify_not_published(); 1031#endif 1032 1033 //JNI functiontable getter/setter for JVMTI jni function table interception API. 1034 void set_jni_functions(struct JNINativeInterface_* functionTable) { 1035 _jni_environment.functions = functionTable; 1036 } 1037 struct JNINativeInterface_* get_jni_functions() { 1038 return (struct JNINativeInterface_ *)_jni_environment.functions; 1039 } 1040 1041 // This function is called at thread creation to allow 1042 // platform specific thread variables to be initialized. 1043 void cache_global_variables(); 1044 1045 // Executes Shutdown.shutdown() 1046 void invoke_shutdown_hooks(); 1047 1048 // Cleanup on thread exit 1049 enum ExitType { 1050 normal_exit, 1051 jni_detach 1052 }; 1053 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 1054 1055 void cleanup_failed_attach_current_thread(); 1056 1057 // Testers 1058 virtual bool is_Java_thread() const { return true; } 1059 virtual bool can_call_java() const { return true; } 1060 1061 // Thread chain operations 1062 JavaThread* next() const { return _next; } 1063 void set_next(JavaThread* p) { _next = p; } 1064 1065 // Thread oop. threadObj() can be NULL for initial JavaThread 1066 // (or for threads attached via JNI) 1067 oop threadObj() const { return _threadObj; } 1068 void set_threadObj(oop p) { _threadObj = p; } 1069 1070 ThreadPriority java_priority() const; // Read from threadObj() 1071 1072 // Prepare thread and add to priority queue. If a priority is 1073 // not specified, use the priority of the thread object. Threads_lock 1074 // must be held while this function is called. 1075 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 1076 void prepare_ext(); 1077 1078 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 1079 address saved_exception_pc() { return _saved_exception_pc; } 1080 1081 1082 ThreadFunction entry_point() const { return _entry_point; } 1083 1084 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1085 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS); 1086 1087 // Last frame anchor routines 1088 1089 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1090 1091 // last_Java_sp 1092 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1093 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1094 1095 // last_Java_pc 1096 1097 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1098 1099 // Safepoint support 1100#if !(defined(PPC64) || defined(AARCH64)) 1101 JavaThreadState thread_state() const { return _thread_state; } 1102 void set_thread_state(JavaThreadState s) { _thread_state = s; } 1103#else 1104 // Use membars when accessing volatile _thread_state. See 1105 // Threads::create_vm() for size checks. 1106 inline JavaThreadState thread_state() const; 1107 inline void set_thread_state(JavaThreadState s); 1108#endif 1109 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } 1110 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } 1111 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } 1112 1113 // thread has called JavaThread::exit() or is terminated 1114 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } 1115 // thread is terminated (no longer on the threads list); we compare 1116 // against the two non-terminated values so that a freed JavaThread 1117 // will also be considered terminated. 1118 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } 1119 void set_terminated(TerminatedTypes t) { _terminated = t; } 1120 // special for Threads::remove() which is static: 1121 void set_terminated_value() { _terminated = _thread_terminated; } 1122 void block_if_vm_exited(); 1123 1124 bool doing_unsafe_access() { return _doing_unsafe_access; } 1125 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1126 1127 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1128 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1129 1130 // Suspend/resume support for JavaThread 1131 private: 1132 inline void set_ext_suspended(); 1133 inline void clear_ext_suspended(); 1134 1135 public: 1136 void java_suspend(); 1137 void java_resume(); 1138 int java_suspend_self(); 1139 1140 void check_and_wait_while_suspended() { 1141 assert(JavaThread::current() == this, "sanity check"); 1142 1143 bool do_self_suspend; 1144 do { 1145 // were we externally suspended while we were waiting? 1146 do_self_suspend = handle_special_suspend_equivalent_condition(); 1147 if (do_self_suspend) { 1148 // don't surprise the thread that suspended us by returning 1149 java_suspend_self(); 1150 set_suspend_equivalent(); 1151 } 1152 } while (do_self_suspend); 1153 } 1154 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); 1155 // Check for async exception in addition to safepoint and suspend request. 1156 static void check_special_condition_for_native_trans(JavaThread *thread); 1157 1158 // Same as check_special_condition_for_native_trans but finishes the 1159 // transition into thread_in_Java mode so that it can potentially 1160 // block. 1161 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); 1162 1163 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); 1164 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { 1165 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1166 // Warning: is_ext_suspend_completed() may temporarily drop the 1167 // SR_lock to allow the thread to reach a stable thread state if 1168 // it is currently in a transient thread state. 1169 return is_ext_suspend_completed(false /* !called_by_wait */, 1170 SuspendRetryDelay, bits); 1171 } 1172 1173 // We cannot allow wait_for_ext_suspend_completion() to run forever or 1174 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally 1175 // passed as the count and delay parameters. Experiments with specific 1176 // calls to wait_for_ext_suspend_completion() can be done by passing 1177 // other values in the code. Experiments with all calls can be done 1178 // via the appropriate -XX options. 1179 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); 1180 1181 inline void set_external_suspend(); 1182 inline void clear_external_suspend(); 1183 1184 inline void set_deopt_suspend(); 1185 inline void clear_deopt_suspend(); 1186 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } 1187 1188 bool is_external_suspend() const { 1189 return (_suspend_flags & _external_suspend) != 0; 1190 } 1191 // Whenever a thread transitions from native to vm/java it must suspend 1192 // if external|deopt suspend is present. 1193 bool is_suspend_after_native() const { 1194 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0; 1195 } 1196 1197 // external suspend request is completed 1198 bool is_ext_suspended() const { 1199 return (_suspend_flags & _ext_suspended) != 0; 1200 } 1201 1202 bool is_external_suspend_with_lock() const { 1203 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1204 return is_external_suspend(); 1205 } 1206 1207 // Special method to handle a pending external suspend request 1208 // when a suspend equivalent condition lifts. 1209 bool handle_special_suspend_equivalent_condition() { 1210 assert(is_suspend_equivalent(), 1211 "should only be called in a suspend equivalence condition"); 1212 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1213 bool ret = is_external_suspend(); 1214 if (!ret) { 1215 // not about to self-suspend so clear suspend equivalence 1216 clear_suspend_equivalent(); 1217 } 1218 // implied else: 1219 // We have a pending external suspend request so we leave the 1220 // suspend_equivalent flag set until java_suspend_self() sets 1221 // the ext_suspended flag and clears the suspend_equivalent 1222 // flag. This insures that wait_for_ext_suspend_completion() 1223 // will return consistent values. 1224 return ret; 1225 } 1226 1227 // utility methods to see if we are doing some kind of suspension 1228 bool is_being_ext_suspended() const { 1229 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1230 return is_ext_suspended() || is_external_suspend(); 1231 } 1232 1233 bool is_suspend_equivalent() const { return _suspend_equivalent; } 1234 1235 void set_suspend_equivalent() { _suspend_equivalent = true; } 1236 void clear_suspend_equivalent() { _suspend_equivalent = false; } 1237 1238 // Thread.stop support 1239 void send_thread_stop(oop throwable); 1240 AsyncRequests clear_special_runtime_exit_condition() { 1241 AsyncRequests x = _special_runtime_exit_condition; 1242 _special_runtime_exit_condition = _no_async_condition; 1243 return x; 1244 } 1245 1246 // Are any async conditions present? 1247 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } 1248 1249 void check_and_handle_async_exceptions(bool check_unsafe_error = true); 1250 1251 // these next two are also used for self-suspension and async exception support 1252 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1253 1254 // Return true if JavaThread has an asynchronous condition or 1255 // if external suspension is requested. 1256 bool has_special_runtime_exit_condition() { 1257 // We call is_external_suspend() last since external suspend should 1258 // be less common. Because we don't use is_external_suspend_with_lock 1259 // it is possible that we won't see an asynchronous external suspend 1260 // request that has just gotten started, i.e., SR_lock grabbed but 1261 // _external_suspend field change either not made yet or not visible 1262 // yet. However, this is okay because the request is asynchronous and 1263 // we will see the new flag value the next time through. It's also 1264 // possible that the external suspend request is dropped after 1265 // we have checked is_external_suspend(), we will recheck its value 1266 // under SR_lock in java_suspend_self(). 1267 return (_special_runtime_exit_condition != _no_async_condition) || 1268 is_external_suspend() || is_deopt_suspend(); 1269 } 1270 1271 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } 1272 1273 inline void set_pending_async_exception(oop e); 1274 1275 // Fast-locking support 1276 bool is_lock_owned(address adr) const; 1277 1278 // Accessors for vframe array top 1279 // The linked list of vframe arrays are sorted on sp. This means when we 1280 // unpack the head must contain the vframe array to unpack. 1281 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1282 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1283 1284 // Side structure for deferring update of java frame locals until deopt occurs 1285 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } 1286 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } 1287 1288 // These only really exist to make debugging deopt problems simpler 1289 1290 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1291 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1292 1293 // The special resourceMark used during deoptimization 1294 1295 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1296 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1297 1298 intptr_t* must_deopt_id() { return _must_deopt_id; } 1299 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } 1300 void clear_must_deopt_id() { _must_deopt_id = NULL; } 1301 1302 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } 1303 nmethod* deopt_nmethod() { return _deopt_nmethod; } 1304 1305 Method* callee_target() const { return _callee_target; } 1306 void set_callee_target (Method* x) { _callee_target = x; } 1307 1308 // Oop results of vm runtime calls 1309 oop vm_result() const { return _vm_result; } 1310 void set_vm_result (oop x) { _vm_result = x; } 1311 1312 Metadata* vm_result_2() const { return _vm_result_2; } 1313 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1314 1315 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1316 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1317 1318#if INCLUDE_JVMCI 1319 int pending_deoptimization() const { return _pending_deoptimization; } 1320 oop pending_failed_speculation() const { return _pending_failed_speculation; } 1321 bool has_pending_monitorenter() const { return _pending_monitorenter; } 1322 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } 1323 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } 1324 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; } 1325 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } 1326 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; } 1327 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; } 1328#endif // INCLUDE_JVMCI 1329 1330 // Exception handling for compiled methods 1331 oop exception_oop() const { return _exception_oop; } 1332 address exception_pc() const { return _exception_pc; } 1333 address exception_handler_pc() const { return _exception_handler_pc; } 1334 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1335 1336 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); } 1337 void set_exception_pc(address a) { _exception_pc = a; } 1338 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1339 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1340 1341 void clear_exception_oop_and_pc() { 1342 set_exception_oop(NULL); 1343 set_exception_pc(NULL); 1344 } 1345 1346 // Stack overflow support 1347 inline size_t stack_available(address cur_sp); 1348 address stack_reserved_zone_base() { 1349 return stack_yellow_zone_base(); } 1350 size_t stack_reserved_zone_size() { 1351 return StackReservedPages * os::vm_page_size(); } 1352 address stack_yellow_zone_base() { 1353 return (address)(stack_base() - 1354 (stack_size() - 1355 (stack_red_zone_size() + stack_yellow_zone_size()))); 1356 } 1357 size_t stack_yellow_zone_size() { 1358 return StackYellowPages * os::vm_page_size() + stack_reserved_zone_size(); 1359 } 1360 address stack_red_zone_base() { 1361 return (address)(stack_base() - (stack_size() - stack_red_zone_size())); 1362 } 1363 size_t stack_red_zone_size() { return StackRedPages * os::vm_page_size(); } 1364 bool in_stack_reserved_zone(address a) { 1365 return (a <= stack_reserved_zone_base()) && (a >= (address)((intptr_t)stack_reserved_zone_base() - stack_reserved_zone_size())); 1366 } 1367 bool in_stack_yellow_zone(address a) { 1368 return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); 1369 } 1370 bool in_stack_red_zone(address a) { 1371 return (a <= stack_red_zone_base()) && 1372 (a >= (address)((intptr_t)stack_base() - stack_size())); 1373 } 1374 1375 void create_stack_guard_pages(); 1376 void remove_stack_guard_pages(); 1377 1378 void enable_stack_reserved_zone(); 1379 void disable_stack_reserved_zone(); 1380 void enable_stack_yellow_zone(); 1381 void disable_stack_yellow_zone(); 1382 void enable_stack_red_zone(); 1383 void disable_stack_red_zone(); 1384 1385 inline bool stack_guard_zone_unused(); 1386 inline bool stack_yellow_zone_disabled(); 1387 inline bool stack_reserved_zone_disabled(); 1388 inline bool stack_guards_enabled(); 1389 1390 address reserved_stack_activation() const { return _reserved_stack_activation; } 1391 void set_reserved_stack_activation(address addr) { 1392 assert(_reserved_stack_activation == stack_base() 1393 || _reserved_stack_activation == NULL 1394 || addr == stack_base(), "Must not be set twice"); 1395 _reserved_stack_activation = addr; 1396 } 1397 1398 // Attempt to reguard the stack after a stack overflow may have occurred. 1399 // Returns true if (a) guard pages are not needed on this thread, (b) the 1400 // pages are already guarded, or (c) the pages were successfully reguarded. 1401 // Returns false if there is not enough stack space to reguard the pages, in 1402 // which case the caller should unwind a frame and try again. The argument 1403 // should be the caller's (approximate) sp. 1404 bool reguard_stack(address cur_sp); 1405 // Similar to above but see if current stackpoint is out of the guard area 1406 // and reguard if possible. 1407 bool reguard_stack(void); 1408 1409 address stack_overflow_limit() { return _stack_overflow_limit; } 1410 void set_stack_overflow_limit() { 1411 _stack_overflow_limit = _stack_base - _stack_size + 1412 ((StackShadowPages + 1413 StackReservedPages + 1414 StackYellowPages + 1415 StackRedPages) * os::vm_page_size()); 1416 } 1417 1418 // Misc. accessors/mutators 1419 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1420 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1421 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1422 1423#ifndef PRODUCT 1424 void record_jump(address target, address instr, const char* file, int line); 1425#endif // PRODUCT 1426 1427 // For assembly stub generation 1428 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } 1429#ifndef PRODUCT 1430 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); } 1431 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); } 1432#endif // PRODUCT 1433 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } 1434 static ByteSize last_Java_sp_offset() { 1435 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1436 } 1437 static ByteSize last_Java_pc_offset() { 1438 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1439 } 1440 static ByteSize frame_anchor_offset() { 1441 return byte_offset_of(JavaThread, _anchor); 1442 } 1443 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } 1444 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } 1445 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } 1446 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } 1447 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } 1448 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } 1449#if INCLUDE_JVMCI 1450 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); } 1451 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); } 1452 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); } 1453 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); } 1454 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); } 1455 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); } 1456#endif // INCLUDE_JVMCI 1457 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } 1458 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } 1459 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1460 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } 1461 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1462 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); } 1463 static ByteSize reserved_stack_activation_offset() { return byte_offset_of(JavaThread, _reserved_stack_activation); } 1464 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } 1465 1466 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1467 static ByteSize should_post_on_exceptions_flag_offset() { 1468 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1469 } 1470 1471#if INCLUDE_ALL_GCS 1472 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } 1473 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } 1474#endif // INCLUDE_ALL_GCS 1475 1476 // Returns the jni environment for this thread 1477 JNIEnv* jni_environment() { return &_jni_environment; } 1478 1479 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1480 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1481 // Only return NULL if thread is off the thread list; starting to 1482 // exit should not return NULL. 1483 if (thread_from_jni_env->is_terminated()) { 1484 thread_from_jni_env->block_if_vm_exited(); 1485 return NULL; 1486 } else { 1487 return thread_from_jni_env; 1488 } 1489 } 1490 1491 // JNI critical regions. These can nest. 1492 bool in_critical() { return _jni_active_critical > 0; } 1493 bool in_last_critical() { return _jni_active_critical == 1; } 1494 void enter_critical() { 1495 assert(Thread::current() == this || 1496 (Thread::current()->is_VM_thread() && 1497 SafepointSynchronize::is_synchronizing()), 1498 "this must be current thread or synchronizing"); 1499 _jni_active_critical++; 1500 } 1501 void exit_critical() { 1502 assert(Thread::current() == this, "this must be current thread"); 1503 _jni_active_critical--; 1504 assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); 1505 } 1506 1507 // Checked JNI, is the programmer required to check for exceptions, specify which function name 1508 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1509 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1510 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1511 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1512 1513 // For deadlock detection 1514 int depth_first_number() { return _depth_first_number; } 1515 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1516 1517 private: 1518 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1519 1520 public: 1521 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1522 void add_monitor_chunk(MonitorChunk* chunk); 1523 void remove_monitor_chunk(MonitorChunk* chunk); 1524 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1525 void inc_in_deopt_handler() { _in_deopt_handler++; } 1526 void dec_in_deopt_handler() { 1527 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1528 if (_in_deopt_handler > 0) { // robustness 1529 _in_deopt_handler--; 1530 } 1531 } 1532 1533 private: 1534 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1535 1536 public: 1537 1538 // Frame iteration; calls the function f for all frames on the stack 1539 void frames_do(void f(frame*, const RegisterMap*)); 1540 1541 // Memory operations 1542 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1543 1544 // Sweeper operations 1545 void nmethods_do(CodeBlobClosure* cf); 1546 1547 // RedefineClasses Support 1548 void metadata_do(void f(Metadata*)); 1549 1550 // Misc. operations 1551 char* name() const { return (char*)get_thread_name(); } 1552 void print_on(outputStream* st) const; 1553 void print_value(); 1554 void print_thread_state_on(outputStream*) const PRODUCT_RETURN; 1555 void print_thread_state() const PRODUCT_RETURN; 1556 void print_on_error(outputStream* st, char* buf, int buflen) const; 1557 void verify(); 1558 const char* get_thread_name() const; 1559 private: 1560 // factor out low-level mechanics for use in both normal and error cases 1561 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1562 public: 1563 const char* get_threadgroup_name() const; 1564 const char* get_parent_name() const; 1565 1566 // Accessing frames 1567 frame last_frame() { 1568 _anchor.make_walkable(this); 1569 return pd_last_frame(); 1570 } 1571 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1572 1573 // Returns method at 'depth' java or native frames down the stack 1574 // Used for security checks 1575 Klass* security_get_caller_class(int depth); 1576 1577 // Print stack trace in external format 1578 void print_stack_on(outputStream* st); 1579 void print_stack() { print_stack_on(tty); } 1580 1581 // Print stack traces in various internal formats 1582 void trace_stack() PRODUCT_RETURN; 1583 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1584 void trace_frames() PRODUCT_RETURN; 1585 void trace_oops() PRODUCT_RETURN; 1586 1587 // Print an annotated view of the stack frames 1588 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1589 void validate_frame_layout() { 1590 print_frame_layout(0, true); 1591 } 1592 1593 // Returns the number of stack frames on the stack 1594 int depth() const; 1595 1596 // Function for testing deoptimization 1597 void deoptimize(); 1598 void make_zombies(); 1599 1600 void deoptimized_wrt_marked_nmethods(); 1601 1602 // Profiling operation (see fprofile.cpp) 1603 public: 1604 bool profile_last_Java_frame(frame* fr); 1605 1606 private: 1607 ThreadProfiler* _thread_profiler; 1608 private: 1609 friend class FlatProfiler; // uses both [gs]et_thread_profiler. 1610 friend class FlatProfilerTask; // uses get_thread_profiler. 1611 friend class ThreadProfilerMark; // uses get_thread_profiler. 1612 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } 1613 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { 1614 ThreadProfiler* result = _thread_profiler; 1615 _thread_profiler = tp; 1616 return result; 1617 } 1618 1619 public: 1620 // Returns the running thread as a JavaThread 1621 static inline JavaThread* current(); 1622 1623 // Returns the active Java thread. Do not use this if you know you are calling 1624 // from a JavaThread, as it's slower than JavaThread::current. If called from 1625 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1626 // operation. You may not want that either. 1627 static JavaThread* active(); 1628 1629 inline CompilerThread* as_CompilerThread(); 1630 1631 public: 1632 virtual void run(); 1633 void thread_main_inner(); 1634 1635 private: 1636 // PRIVILEGED STACK 1637 PrivilegedElement* _privileged_stack_top; 1638 GrowableArray<oop>* _array_for_gc; 1639 public: 1640 1641 // Returns the privileged_stack information. 1642 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } 1643 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } 1644 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } 1645 1646 public: 1647 // Thread local information maintained by JVMTI. 1648 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1649 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1650 // getter is used to get this JavaThread's JvmtiThreadState if it has 1651 // one which means NULL can be returned. JvmtiThreadState::state_for() 1652 // is used to get the specified JavaThread's JvmtiThreadState if it has 1653 // one or it allocates a new JvmtiThreadState for the JavaThread and 1654 // returns it. JvmtiThreadState::state_for() will return NULL only if 1655 // the specified JavaThread is exiting. 1656 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1657 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1658 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } 1659 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } 1660 1661 // JVMTI PopFrame support 1662 // Setting and clearing popframe_condition 1663 // All of these enumerated values are bits. popframe_pending 1664 // indicates that a PopFrame() has been requested and not yet been 1665 // completed. popframe_processing indicates that that PopFrame() is in 1666 // the process of being completed. popframe_force_deopt_reexecution_bit 1667 // indicates that special handling is required when returning to a 1668 // deoptimized caller. 1669 enum PopCondition { 1670 popframe_inactive = 0x00, 1671 popframe_pending_bit = 0x01, 1672 popframe_processing_bit = 0x02, 1673 popframe_force_deopt_reexecution_bit = 0x04 1674 }; 1675 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1676 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1677 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1678 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1679 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1680 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1681 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1682 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1683#ifdef CC_INTERP 1684 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } 1685 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } 1686 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1687 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1688 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1689#endif 1690 1691 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1692 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1693 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1694 1695 private: 1696 // Saved incoming arguments to popped frame. 1697 // Used only when popped interpreted frame returns to deoptimized frame. 1698 void* _popframe_preserved_args; 1699 int _popframe_preserved_args_size; 1700 1701 public: 1702 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1703 void* popframe_preserved_args(); 1704 ByteSize popframe_preserved_args_size(); 1705 WordSize popframe_preserved_args_size_in_words(); 1706 void popframe_free_preserved_args(); 1707 1708 1709 private: 1710 JvmtiThreadState *_jvmti_thread_state; 1711 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; 1712 1713 // Used by the interpreter in fullspeed mode for frame pop, method 1714 // entry, method exit and single stepping support. This field is 1715 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. 1716 // It can be set to zero asynchronously (i.e., without a VM operation 1717 // or a lock) so we have to be very careful. 1718 int _interp_only_mode; 1719 1720 public: 1721 // used by the interpreter for fullspeed debugging support (see above) 1722 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1723 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1724 int get_interp_only_mode() { return _interp_only_mode; } 1725 void increment_interp_only_mode() { ++_interp_only_mode; } 1726 void decrement_interp_only_mode() { --_interp_only_mode; } 1727 1728 // support for cached flag that indicates whether exceptions need to be posted for this thread 1729 // if this is false, we can avoid deoptimizing when events are thrown 1730 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1731 private: 1732 int _should_post_on_exceptions_flag; 1733 1734 public: 1735 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1736 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1737 1738 private: 1739 ThreadStatistics *_thread_stat; 1740 1741 public: 1742 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1743 1744 // Return a blocker object for which this thread is blocked parking. 1745 oop current_park_blocker(); 1746 1747 private: 1748 static size_t _stack_size_at_create; 1749 1750 public: 1751 static inline size_t stack_size_at_create(void) { 1752 return _stack_size_at_create; 1753 } 1754 static inline void set_stack_size_at_create(size_t value) { 1755 _stack_size_at_create = value; 1756 } 1757 1758#if INCLUDE_ALL_GCS 1759 // SATB marking queue support 1760 SATBMarkQueue& satb_mark_queue() { return _satb_mark_queue; } 1761 static SATBMarkQueueSet& satb_mark_queue_set() { 1762 return _satb_mark_queue_set; 1763 } 1764 1765 // Dirty card queue support 1766 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } 1767 static DirtyCardQueueSet& dirty_card_queue_set() { 1768 return _dirty_card_queue_set; 1769 } 1770#endif // INCLUDE_ALL_GCS 1771 1772 // This method initializes the SATB and dirty card queues before a 1773 // JavaThread is added to the Java thread list. Right now, we don't 1774 // have to do anything to the dirty card queue (it should have been 1775 // activated when the thread was created), but we have to activate 1776 // the SATB queue if the thread is created while a marking cycle is 1777 // in progress. The activation / de-activation of the SATB queues at 1778 // the beginning / end of a marking cycle is done during safepoints 1779 // so we have to make sure this method is called outside one to be 1780 // able to safely read the active field of the SATB queue set. Right 1781 // now, it is called just before the thread is added to the Java 1782 // thread list in the Threads::add() method. That method is holding 1783 // the Threads_lock which ensures we are outside a safepoint. We 1784 // cannot do the obvious and set the active field of the SATB queue 1785 // when the thread is created given that, in some cases, safepoints 1786 // might happen between the JavaThread constructor being called and the 1787 // thread being added to the Java thread list (an example of this is 1788 // when the structure for the DestroyJavaVM thread is created). 1789#if INCLUDE_ALL_GCS 1790 void initialize_queues(); 1791#else // INCLUDE_ALL_GCS 1792 void initialize_queues() { } 1793#endif // INCLUDE_ALL_GCS 1794 1795 // Machine dependent stuff 1796#ifdef TARGET_OS_ARCH_linux_x86 1797# include "thread_linux_x86.hpp" 1798#endif 1799#ifdef TARGET_OS_ARCH_linux_sparc 1800# include "thread_linux_sparc.hpp" 1801#endif 1802#ifdef TARGET_OS_ARCH_linux_zero 1803# include "thread_linux_zero.hpp" 1804#endif 1805#ifdef TARGET_OS_ARCH_solaris_x86 1806# include "thread_solaris_x86.hpp" 1807#endif 1808#ifdef TARGET_OS_ARCH_solaris_sparc 1809# include "thread_solaris_sparc.hpp" 1810#endif 1811#ifdef TARGET_OS_ARCH_windows_x86 1812# include "thread_windows_x86.hpp" 1813#endif 1814#ifdef TARGET_OS_ARCH_linux_arm 1815# include "thread_linux_arm.hpp" 1816#endif 1817#ifdef TARGET_OS_ARCH_linux_ppc 1818# include "thread_linux_ppc.hpp" 1819#endif 1820#ifdef TARGET_OS_ARCH_linux_aarch64 1821# include "thread_linux_aarch64.hpp" 1822#endif 1823#ifdef TARGET_OS_ARCH_aix_ppc 1824# include "thread_aix_ppc.hpp" 1825#endif 1826#ifdef TARGET_OS_ARCH_bsd_x86 1827# include "thread_bsd_x86.hpp" 1828#endif 1829#ifdef TARGET_OS_ARCH_bsd_zero 1830# include "thread_bsd_zero.hpp" 1831#endif 1832 1833 1834 public: 1835 void set_blocked_on_compilation(bool value) { 1836 _blocked_on_compilation = value; 1837 } 1838 1839 bool blocked_on_compilation() { 1840 return _blocked_on_compilation; 1841 } 1842 protected: 1843 bool _blocked_on_compilation; 1844 1845 1846 // JSR166 per-thread parker 1847 private: 1848 Parker* _parker; 1849 public: 1850 Parker* parker() { return _parker; } 1851 1852 // Biased locking support 1853 private: 1854 GrowableArray<MonitorInfo*>* _cached_monitor_info; 1855 public: 1856 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 1857 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 1858 1859 // clearing/querying jni attach status 1860 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1861 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1862 inline void set_done_attaching_via_jni(); 1863 private: 1864 // This field is used to determine if a thread has claimed 1865 // a par_id: it is UINT_MAX if the thread has not claimed a par_id; 1866 // otherwise its value is the par_id that has been claimed. 1867 uint _claimed_par_id; 1868 public: 1869 uint get_claimed_par_id() { return _claimed_par_id; } 1870 void set_claimed_par_id(uint id) { _claimed_par_id = id; } 1871}; 1872 1873// Inline implementation of JavaThread::current 1874inline JavaThread* JavaThread::current() { 1875 Thread* thread = Thread::current(); 1876 assert(thread->is_Java_thread(), "just checking"); 1877 return (JavaThread*)thread; 1878} 1879 1880inline CompilerThread* JavaThread::as_CompilerThread() { 1881 assert(is_Compiler_thread(), "just checking"); 1882 return (CompilerThread*)this; 1883} 1884 1885// Dedicated thread to sweep the code cache 1886class CodeCacheSweeperThread : public JavaThread { 1887 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper 1888 public: 1889 CodeCacheSweeperThread(); 1890 // Track the nmethod currently being scanned by the sweeper 1891 void set_scanned_nmethod(nmethod* nm) { 1892 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value"); 1893 _scanned_nmethod = nm; 1894 } 1895 1896 // Hide sweeper thread from external view. 1897 bool is_hidden_from_external_view() const { return true; } 1898 1899 bool is_Code_cache_sweeper_thread() const { return true; } 1900 // GC support 1901 // Apply "f->do_oop" to all root oops in "this". 1902 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 1903 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1904}; 1905 1906// A thread used for Compilation. 1907class CompilerThread : public JavaThread { 1908 friend class VMStructs; 1909 private: 1910 CompilerCounters* _counters; 1911 1912 ciEnv* _env; 1913 CompileLog* _log; 1914 CompileTask* _task; 1915 CompileQueue* _queue; 1916 BufferBlob* _buffer_blob; 1917 1918 AbstractCompiler* _compiler; 1919 1920 public: 1921 1922 static CompilerThread* current(); 1923 1924 CompilerThread(CompileQueue* queue, CompilerCounters* counters); 1925 1926 bool is_Compiler_thread() const { return true; } 1927 1928 virtual bool can_call_java() const; 1929 1930 // Hide native compiler threads from external view. 1931 bool is_hidden_from_external_view() const { return !can_call_java(); } 1932 1933 void set_compiler(AbstractCompiler* c) { _compiler = c; } 1934 AbstractCompiler* compiler() const { return _compiler; } 1935 1936 CompileQueue* queue() const { return _queue; } 1937 CompilerCounters* counters() const { return _counters; } 1938 1939 // Get/set the thread's compilation environment. 1940 ciEnv* env() { return _env; } 1941 void set_env(ciEnv* env) { _env = env; } 1942 1943 BufferBlob* get_buffer_blob() const { return _buffer_blob; } 1944 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; } 1945 1946 // Get/set the thread's logging information 1947 CompileLog* log() { return _log; } 1948 void init_log(CompileLog* log) { 1949 // Set once, for good. 1950 assert(_log == NULL, "set only once"); 1951 _log = log; 1952 } 1953 1954#ifndef PRODUCT 1955 private: 1956 IdealGraphPrinter *_ideal_graph_printer; 1957 public: 1958 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } 1959 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } 1960#endif 1961 1962 // Get/set the thread's current task 1963 CompileTask* task() { return _task; } 1964 void set_task(CompileTask* task) { _task = task; } 1965}; 1966 1967inline CompilerThread* CompilerThread::current() { 1968 return JavaThread::current()->as_CompilerThread(); 1969} 1970 1971// The active thread queue. It also keeps track of the current used 1972// thread priorities. 1973class Threads: AllStatic { 1974 friend class VMStructs; 1975 private: 1976 static JavaThread* _thread_list; 1977 static int _number_of_threads; 1978 static int _number_of_non_daemon_threads; 1979 static int _return_code; 1980 static int _thread_claim_parity; 1981#ifdef ASSERT 1982 static bool _vm_complete; 1983#endif 1984 1985 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS); 1986 static void initialize_jsr292_core_classes(TRAPS); 1987 public: 1988 // Thread management 1989 // force_daemon is a concession to JNI, where we may need to add a 1990 // thread to the thread list before allocating its thread object 1991 static void add(JavaThread* p, bool force_daemon = false); 1992 static void remove(JavaThread* p); 1993 static bool includes(JavaThread* p); 1994 static JavaThread* first() { return _thread_list; } 1995 static void threads_do(ThreadClosure* tc); 1996 1997 // Initializes the vm and creates the vm thread 1998 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 1999 static void convert_vm_init_libraries_to_agents(); 2000 static void create_vm_init_libraries(); 2001 static void create_vm_init_agents(); 2002 static void shutdown_vm_agents(); 2003 static bool destroy_vm(); 2004 // Supported VM versions via JNI 2005 // Includes JNI_VERSION_1_1 2006 static jboolean is_supported_jni_version_including_1_1(jint version); 2007 // Does not include JNI_VERSION_1_1 2008 static jboolean is_supported_jni_version(jint version); 2009 2010 // The "thread claim parity" provides a way for threads to be claimed 2011 // by parallel worker tasks. 2012 // 2013 // Each thread contains a a "parity" field. A task will claim the 2014 // thread only if its parity field is the same as the global parity, 2015 // which is updated by calling change_thread_claim_parity(). 2016 // 2017 // For this to work change_thread_claim_parity() needs to be called 2018 // exactly once in sequential code before starting parallel tasks 2019 // that should claim threads. 2020 // 2021 // New threads get their parity set to 0 and change_thread_claim_parity() 2022 // never set the global parity to 0. 2023 static int thread_claim_parity() { return _thread_claim_parity; } 2024 static void change_thread_claim_parity(); 2025 static void assert_all_threads_claimed() NOT_DEBUG_RETURN; 2026 2027 // Apply "f->do_oop" to all root oops in all threads. 2028 // This version may only be called by sequential code. 2029 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 2030 // This version may be called by sequential or parallel code. 2031 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 2032 // This creates a list of GCTasks, one per thread. 2033 static void create_thread_roots_tasks(GCTaskQueue* q); 2034 // This creates a list of GCTasks, one per thread, for marking objects. 2035 static void create_thread_roots_marking_tasks(GCTaskQueue* q); 2036 2037 // Apply "f->do_oop" to roots in all threads that 2038 // are part of compiled frames 2039 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); 2040 2041 static void convert_hcode_pointers(); 2042 static void restore_hcode_pointers(); 2043 2044 // Sweeper 2045 static void nmethods_do(CodeBlobClosure* cf); 2046 2047 // RedefineClasses support 2048 static void metadata_do(void f(Metadata*)); 2049 static void metadata_handles_do(void f(Metadata*)); 2050 2051#ifdef ASSERT 2052 static bool is_vm_complete() { return _vm_complete; } 2053#endif 2054 2055 // Verification 2056 static void verify(); 2057 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); 2058 static void print(bool print_stacks, bool internal_format) { 2059 // this function is only used by debug.cpp 2060 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); 2061 } 2062 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 2063 2064 // Get Java threads that are waiting to enter a monitor. If doLock 2065 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2066 // VM needs to be at a safepoint. 2067 static GrowableArray<JavaThread*>* get_pending_threads(int count, 2068 address monitor, bool doLock); 2069 2070 // Get owning Java thread from the monitor's owner field. If doLock 2071 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2072 // VM needs to be at a safepoint. 2073 static JavaThread *owning_thread_from_monitor_owner(address owner, 2074 bool doLock); 2075 2076 // Number of threads on the active threads list 2077 static int number_of_threads() { return _number_of_threads; } 2078 // Number of non-daemon threads on the active threads list 2079 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 2080 2081 // Deoptimizes all frames tied to marked nmethods 2082 static void deoptimized_wrt_marked_nmethods(); 2083 2084 static JavaThread* find_java_thread_from_java_tid(jlong java_tid); 2085 2086}; 2087 2088 2089// Thread iterator 2090class ThreadClosure: public StackObj { 2091 public: 2092 virtual void do_thread(Thread* thread) = 0; 2093}; 2094 2095class SignalHandlerMark: public StackObj { 2096 private: 2097 Thread* _thread; 2098 public: 2099 SignalHandlerMark(Thread* t) { 2100 _thread = t; 2101 if (_thread) _thread->enter_signal_handler(); 2102 } 2103 ~SignalHandlerMark() { 2104 if (_thread) _thread->leave_signal_handler(); 2105 _thread = NULL; 2106 } 2107}; 2108 2109 2110#endif // SHARE_VM_RUNTIME_THREAD_HPP 2111