thread.hpp revision 9801:80f8be586fae
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 friend class JVMCIVMStructs; 105 private: 106 107#ifndef USE_LIBRARY_BASED_TLS_ONLY 108 // Current thread is maintained as a thread-local variable 109 static THREAD_LOCAL_DECL Thread* _thr_current; 110#endif 111 112 // Exception handling 113 // (Note: _pending_exception and friends are in ThreadShadow) 114 //oop _pending_exception; // pending exception for current thread 115 // const char* _exception_file; // file information for exception (debugging only) 116 // int _exception_line; // line information for exception (debugging only) 117 protected: 118 // Support for forcing alignment of thread objects for biased locking 119 void* _real_malloc_address; 120 public: 121 void* operator new(size_t size) throw() { return allocate(size, true); } 122 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 123 return allocate(size, false); } 124 void operator delete(void* p); 125 126 protected: 127 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 128 private: 129 130 // *************************************************************** 131 // Suspend and resume support 132 // *************************************************************** 133 // 134 // VM suspend/resume no longer exists - it was once used for various 135 // things including safepoints but was deprecated and finally removed 136 // in Java 7. Because VM suspension was considered "internal" Java-level 137 // suspension was considered "external", and this legacy naming scheme 138 // remains. 139 // 140 // External suspend/resume requests come from JVM_SuspendThread, 141 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI 142 // ResumeThread. External 143 // suspend requests cause _external_suspend to be set and external 144 // resume requests cause _external_suspend to be cleared. 145 // External suspend requests do not nest on top of other external 146 // suspend requests. The higher level APIs reject suspend requests 147 // for already suspended threads. 148 // 149 // The external_suspend 150 // flag is checked by has_special_runtime_exit_condition() and java thread 151 // will self-suspend when handle_special_runtime_exit_condition() is 152 // called. Most uses of the _thread_blocked state in JavaThreads are 153 // considered the same as being externally suspended; if the blocking 154 // condition lifts, the JavaThread will self-suspend. Other places 155 // where VM checks for external_suspend include: 156 // + mutex granting (do not enter monitors when thread is suspended) 157 // + state transitions from _thread_in_native 158 // 159 // In general, java_suspend() does not wait for an external suspend 160 // request to complete. When it returns, the only guarantee is that 161 // the _external_suspend field is true. 162 // 163 // wait_for_ext_suspend_completion() is used to wait for an external 164 // suspend request to complete. External suspend requests are usually 165 // followed by some other interface call that requires the thread to 166 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into 167 // the interface that requires quiescence, we give the JavaThread a 168 // chance to self-suspend before we need it to be quiescent. This 169 // improves overall suspend/query performance. 170 // 171 // _suspend_flags controls the behavior of java_ suspend/resume. 172 // It must be set under the protection of SR_lock. Read from the flag is 173 // OK without SR_lock as long as the value is only used as a hint. 174 // (e.g., check _external_suspend first without lock and then recheck 175 // inside SR_lock and finish the suspension) 176 // 177 // _suspend_flags is also overloaded for other "special conditions" so 178 // that a single check indicates whether any special action is needed 179 // eg. for async exceptions. 180 // ------------------------------------------------------------------- 181 // Notes: 182 // 1. The suspend/resume logic no longer uses ThreadState in OSThread 183 // but we still update its value to keep other part of the system (mainly 184 // JVMTI) happy. ThreadState is legacy code (see notes in 185 // osThread.hpp). 186 // 187 // 2. It would be more natural if set_external_suspend() is private and 188 // part of java_suspend(), but that probably would affect the suspend/query 189 // performance. Need more investigation on this. 190 191 // suspend/resume lock: used for self-suspend 192 Monitor* _SR_lock; 193 194 protected: 195 enum SuspendFlags { 196 // NOTE: avoid using the sign-bit as cc generates different test code 197 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 198 199 _external_suspend = 0x20000000U, // thread is asked to self suspend 200 _ext_suspended = 0x40000000U, // thread has self-suspended 201 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt 202 203 _has_async_exception = 0x00000001U, // there is a pending async exception 204 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock 205 }; 206 207 // various suspension related flags - atomically updated 208 // overloaded for async exception checking in check_special_condition_for_native_trans. 209 volatile uint32_t _suspend_flags; 210 211 private: 212 int _num_nested_signal; 213 214 DEBUG_ONLY(bool _suspendible_thread;) 215 216 public: 217 void enter_signal_handler() { _num_nested_signal++; } 218 void leave_signal_handler() { _num_nested_signal--; } 219 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } 220 221#ifdef ASSERT 222 void set_suspendible_thread() { 223 _suspendible_thread = true; 224 } 225 226 void clear_suspendible_thread() { 227 _suspendible_thread = false; 228 } 229 230 bool is_suspendible_thread() { return _suspendible_thread; } 231#endif 232 233 private: 234 // Active_handles points to a block of handles 235 JNIHandleBlock* _active_handles; 236 237 // One-element thread local free list 238 JNIHandleBlock* _free_handle_block; 239 240 // Point to the last handle mark 241 HandleMark* _last_handle_mark; 242 243 // The parity of the last strong_roots iteration in which this thread was 244 // claimed as a task. 245 jint _oops_do_parity; 246 247 public: 248 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 249 HandleMark* last_handle_mark() const { return _last_handle_mark; } 250 private: 251 252 // debug support for checking if code does allow safepoints or not 253 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on 254 // mutex, or blocking on an object synchronizer (Java locking). 255 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases 256 // If !allow_allocation(), then an assertion failure will happen during allocation 257 // (Hence, !allow_safepoint() => !allow_allocation()). 258 // 259 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. 260 // 261 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen 262 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. 263 264 // Used by SkipGCALot class. 265 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 266 267 friend class No_Alloc_Verifier; 268 friend class No_Safepoint_Verifier; 269 friend class Pause_No_Safepoint_Verifier; 270 friend class GC_locker; 271 272 ThreadLocalAllocBuffer _tlab; // Thread-local eden 273 jlong _allocated_bytes; // Cumulative number of bytes allocated on 274 // the Java heap 275 276 mutable TRACE_DATA _trace_data; // Thread-local data for tracing 277 278 ThreadExt _ext; 279 280 int _vm_operation_started_count; // VM_Operation support 281 int _vm_operation_completed_count; // VM_Operation support 282 283 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread 284 // is waiting to lock 285 bool _current_pending_monitor_is_from_java; // locking is from Java code 286 287 // ObjectMonitor on which this thread called Object.wait() 288 ObjectMonitor* _current_waiting_monitor; 289 290 // Private thread-local objectmonitor list - a simple cache organized as a SLL. 291 public: 292 ObjectMonitor* omFreeList; 293 int omFreeCount; // length of omFreeList 294 int omFreeProvision; // reload chunk size 295 ObjectMonitor* omInUseList; // SLL to track monitors in circulation 296 int omInUseCount; // length of omInUseList 297 298#ifdef ASSERT 299 private: 300 bool _visited_for_critical_count; 301 302 public: 303 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } 304 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } 305#endif 306 307 public: 308 enum { 309 is_definitely_current_thread = true 310 }; 311 312 // Constructor 313 Thread(); 314 virtual ~Thread(); 315 316 // Manage Thread::current() 317 void initialize_thread_current(); 318 private: 319 void clear_thread_current(); // needed for detaching JNI threads 320 321 public: 322 // thread entry point 323 virtual void run(); 324 325 // Testers 326 virtual bool is_VM_thread() const { return false; } 327 virtual bool is_Java_thread() const { return false; } 328 virtual bool is_Compiler_thread() const { return false; } 329 virtual bool is_Code_cache_sweeper_thread() const { return false; } 330 virtual bool is_hidden_from_external_view() const { return false; } 331 virtual bool is_jvmti_agent_thread() const { return false; } 332 // True iff the thread can perform GC operations at a safepoint. 333 // Generally will be true only of VM thread and parallel GC WorkGang 334 // threads. 335 virtual bool is_GC_task_thread() const { return false; } 336 virtual bool is_Watcher_thread() const { return false; } 337 virtual bool is_ConcurrentGC_thread() const { return false; } 338 virtual bool is_Named_thread() const { return false; } 339 virtual bool is_Worker_thread() const { return false; } 340 341 // Can this thread make Java upcalls 342 virtual bool can_call_java() const { return false; } 343 344 // Casts 345 virtual WorkerThread* as_Worker_thread() const { return NULL; } 346 347 virtual char* name() const { return (char*)"Unknown thread"; } 348 349 // Returns the current thread (ASSERTS if NULL) 350 static inline Thread* current(); 351 // Returns the current thread, or NULL if not attached 352 static inline Thread* current_or_null(); 353 // Returns the current thread, or NULL if not attached, and is 354 // safe for use from signal-handlers 355 static inline Thread* current_or_null_safe(); 356 357 // Common thread operations 358 static void set_priority(Thread* thread, ThreadPriority priority); 359 static ThreadPriority get_priority(const Thread* const thread); 360 static void start(Thread* thread); 361 static void interrupt(Thread* thr); 362 static bool is_interrupted(Thread* thr, bool clear_interrupted); 363 364 void set_native_thread_name(const char *name) { 365 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); 366 os::set_native_thread_name(name); 367 } 368 369 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } 370 Monitor* SR_lock() const { return _SR_lock; } 371 372 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } 373 374 inline void set_suspend_flag(SuspendFlags f); 375 inline void clear_suspend_flag(SuspendFlags f); 376 377 inline void set_has_async_exception(); 378 inline void clear_has_async_exception(); 379 380 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } 381 382 inline void set_critical_native_unlock(); 383 inline void clear_critical_native_unlock(); 384 385 // Support for Unhandled Oop detection 386 // Add the field for both, fastdebug and debug, builds to keep 387 // Thread's fields layout the same. 388 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build. 389#ifdef CHECK_UNHANDLED_OOPS 390 private: 391 UnhandledOops* _unhandled_oops; 392#elif defined(ASSERT) 393 private: 394 void* _unhandled_oops; 395#endif 396#ifdef CHECK_UNHANDLED_OOPS 397 public: 398 UnhandledOops* unhandled_oops() { return _unhandled_oops; } 399 // Mark oop safe for gc. It may be stack allocated but won't move. 400 void allow_unhandled_oop(oop *op) { 401 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); 402 } 403 // Clear oops at safepoint so crashes point to unhandled oop violator 404 void clear_unhandled_oops() { 405 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); 406 } 407#endif // CHECK_UNHANDLED_OOPS 408 409 public: 410#ifndef PRODUCT 411 bool skip_gcalot() { return _skip_gcalot; } 412 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 413#endif 414 415 // Installs a pending exception to be inserted later 416 static void send_async_exception(oop thread_oop, oop java_throwable); 417 418 // Resource area 419 ResourceArea* resource_area() const { return _resource_area; } 420 void set_resource_area(ResourceArea* area) { _resource_area = area; } 421 422 OSThread* osthread() const { return _osthread; } 423 void set_osthread(OSThread* thread) { _osthread = thread; } 424 425 // JNI handle support 426 JNIHandleBlock* active_handles() const { return _active_handles; } 427 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 428 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 429 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 430 431 // Internal handle support 432 HandleArea* handle_area() const { return _handle_area; } 433 void set_handle_area(HandleArea* area) { _handle_area = area; } 434 435 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 436 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 437 438 // Thread-Local Allocation Buffer (TLAB) support 439 ThreadLocalAllocBuffer& tlab() { return _tlab; } 440 void initialize_tlab() { 441 if (UseTLAB) { 442 tlab().initialize(); 443 } 444 } 445 446 jlong allocated_bytes() { return _allocated_bytes; } 447 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 448 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 449 inline jlong cooked_allocated_bytes(); 450 451 TRACE_DATA* trace_data() { return &_trace_data; } 452 453 const ThreadExt& ext() const { return _ext; } 454 ThreadExt& ext() { return _ext; } 455 456 // VM operation support 457 int vm_operation_ticket() { return ++_vm_operation_started_count; } 458 int vm_operation_completed_count() { return _vm_operation_completed_count; } 459 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } 460 461 // For tracking the heavyweight monitor the thread is pending on. 462 ObjectMonitor* current_pending_monitor() { 463 return _current_pending_monitor; 464 } 465 void set_current_pending_monitor(ObjectMonitor* monitor) { 466 _current_pending_monitor = monitor; 467 } 468 void set_current_pending_monitor_is_from_java(bool from_java) { 469 _current_pending_monitor_is_from_java = from_java; 470 } 471 bool current_pending_monitor_is_from_java() { 472 return _current_pending_monitor_is_from_java; 473 } 474 475 // For tracking the ObjectMonitor on which this thread called Object.wait() 476 ObjectMonitor* current_waiting_monitor() { 477 return _current_waiting_monitor; 478 } 479 void set_current_waiting_monitor(ObjectMonitor* monitor) { 480 _current_waiting_monitor = monitor; 481 } 482 483 // GC support 484 // Apply "f->do_oop" to all root oops in "this". 485 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive. 486 // Used by JavaThread::oops_do. 487 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 488 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 489 490 // Handles the parallel case for the method below. 491 private: 492 bool claim_oops_do_par_case(int collection_parity); 493 public: 494 // Requires that "collection_parity" is that of the current roots 495 // iteration. If "is_par" is false, sets the parity of "this" to 496 // "collection_parity", and returns "true". If "is_par" is true, 497 // uses an atomic instruction to set the current threads parity to 498 // "collection_parity", if it is not already. Returns "true" iff the 499 // calling thread does the update, this indicates that the calling thread 500 // has claimed the thread's stack as a root groop in the current 501 // collection. 502 bool claim_oops_do(bool is_par, int collection_parity) { 503 if (!is_par) { 504 _oops_do_parity = collection_parity; 505 return true; 506 } else { 507 return claim_oops_do_par_case(collection_parity); 508 } 509 } 510 511 // Sweeper support 512 void nmethods_do(CodeBlobClosure* cf); 513 514 // jvmtiRedefineClasses support 515 void metadata_handles_do(void f(Metadata*)); 516 517 // Used by fast lock support 518 virtual bool is_lock_owned(address adr) const; 519 520 // Check if address is in the stack of the thread (not just for locks). 521 // Warning: the method can only be used on the running thread 522 bool is_in_stack(address adr) const; 523 // Check if address is in the usable part of the stack (excludes protected 524 // guard pages) 525 bool is_in_usable_stack(address adr) const; 526 527 // Sets this thread as starting thread. Returns failure if thread 528 // creation fails due to lack of memory, too many threads etc. 529 bool set_as_starting_thread(); 530 531protected: 532 // OS data associated with the thread 533 OSThread* _osthread; // Platform-specific thread information 534 535 // Thread local resource area for temporary allocation within the VM 536 ResourceArea* _resource_area; 537 538 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 539 540 // Thread local handle area for allocation of handles within the VM 541 HandleArea* _handle_area; 542 GrowableArray<Metadata*>* _metadata_handles; 543 544 // Support for stack overflow handling, get_thread, etc. 545 address _stack_base; 546 size_t _stack_size; 547 uintptr_t _self_raw_id; // used by get_thread (mutable) 548 int _lgrp_id; 549 550 public: 551 // Stack overflow support 552 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 553 554 void set_stack_base(address base) { _stack_base = base; } 555 size_t stack_size() const { return _stack_size; } 556 void set_stack_size(size_t size) { _stack_size = size; } 557 void record_stack_base_and_size(); 558 559 bool on_local_stack(address adr) const { 560 // QQQ this has knowledge of direction, ought to be a stack method 561 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); 562 } 563 564 uintptr_t self_raw_id() { return _self_raw_id; } 565 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } 566 567 int lgrp_id() const { return _lgrp_id; } 568 void set_lgrp_id(int value) { _lgrp_id = value; } 569 570 // Printing 571 virtual void print_on(outputStream* st) const; 572 void print() const { print_on(tty); } 573 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 574 575 // Debug-only code 576#ifdef ASSERT 577 private: 578 // Deadlock detection support for Mutex locks. List of locks own by thread. 579 Monitor* _owned_locks; 580 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 581 // thus the friendship 582 friend class Mutex; 583 friend class Monitor; 584 585 public: 586 void print_owned_locks_on(outputStream* st) const; 587 void print_owned_locks() const { print_owned_locks_on(tty); } 588 Monitor* owned_locks() const { return _owned_locks; } 589 bool owns_locks() const { return owned_locks() != NULL; } 590 bool owns_locks_but_compiled_lock() const; 591 int oops_do_parity() const { return _oops_do_parity; } 592 593 // Deadlock detection 594 bool allow_allocation() { return _allow_allocation_count == 0; } 595 ResourceMark* current_resource_mark() { return _current_resource_mark; } 596 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 597#endif 598 599 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; 600 601 private: 602 volatile int _jvmti_env_iteration_count; 603 604 public: 605 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 606 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 607 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 608 609 // Code generation 610 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); } 611 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); } 612 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); } 613 614 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); } 615 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); } 616 617#define TLAB_FIELD_OFFSET(name) \ 618 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } 619 620 TLAB_FIELD_OFFSET(start) 621 TLAB_FIELD_OFFSET(end) 622 TLAB_FIELD_OFFSET(top) 623 TLAB_FIELD_OFFSET(pf_top) 624 TLAB_FIELD_OFFSET(size) // desired_size 625 TLAB_FIELD_OFFSET(refill_waste_limit) 626 TLAB_FIELD_OFFSET(number_of_refills) 627 TLAB_FIELD_OFFSET(fast_refill_waste) 628 TLAB_FIELD_OFFSET(slow_allocations) 629 630#undef TLAB_FIELD_OFFSET 631 632 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); } 633 634 public: 635 volatile intptr_t _Stalled; 636 volatile int _TypeTag; 637 ParkEvent * _ParkEvent; // for synchronized() 638 ParkEvent * _SleepEvent; // for Thread.sleep 639 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor 640 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease 641 int NativeSyncRecursion; // diagnostic 642 643 volatile int _OnTrap; // Resume-at IP delta 644 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG 645 jint _hashStateX; // thread-specific hashCode generator state 646 jint _hashStateY; 647 jint _hashStateZ; 648 void * _schedctl; 649 650 651 volatile jint rng[4]; // RNG for spin loop 652 653 // Low-level leaf-lock primitives used to implement synchronization 654 // and native monitor-mutex infrastructure. 655 // Not for general synchronization use. 656 static void SpinAcquire(volatile int * Lock, const char * Name); 657 static void SpinRelease(volatile int * Lock); 658 static void muxAcquire(volatile intptr_t * Lock, const char * Name); 659 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev); 660 static void muxRelease(volatile intptr_t * Lock); 661}; 662 663// Inline implementation of Thread::current() 664inline Thread* Thread::current() { 665 Thread* current = current_or_null(); 666 assert(current != NULL, "Thread::current() called on detached thread"); 667 return current; 668} 669 670inline Thread* Thread::current_or_null() { 671#ifndef USE_LIBRARY_BASED_TLS_ONLY 672 return _thr_current; 673#else 674 return ThreadLocalStorage::thread(); 675#endif 676} 677 678inline Thread* Thread::current_or_null_safe() { 679 return ThreadLocalStorage::thread(); 680} 681 682// Name support for threads. non-JavaThread subclasses with multiple 683// uniquely named instances should derive from this. 684class NamedThread: public Thread { 685 friend class VMStructs; 686 enum { 687 max_name_len = 64 688 }; 689 private: 690 char* _name; 691 // log JavaThread being processed by oops_do 692 JavaThread* _processed_thread; 693 uint _gc_id; // The current GC id when a thread takes part in GC 694 695 public: 696 NamedThread(); 697 ~NamedThread(); 698 // May only be called once per thread. 699 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); 700 void initialize_named_thread(); 701 virtual bool is_Named_thread() const { return true; } 702 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } 703 JavaThread *processed_thread() { return _processed_thread; } 704 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } 705 virtual void print_on(outputStream* st) const; 706 707 void set_gc_id(uint gc_id) { _gc_id = gc_id; } 708 uint gc_id() { return _gc_id; } 709}; 710 711// Worker threads are named and have an id of an assigned work. 712class WorkerThread: public NamedThread { 713 private: 714 uint _id; 715 public: 716 WorkerThread() : _id(0) { } 717 virtual bool is_Worker_thread() const { return true; } 718 719 virtual WorkerThread* as_Worker_thread() const { 720 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); 721 return (WorkerThread*) this; 722 } 723 724 void set_id(uint work_id) { _id = work_id; } 725 uint id() const { return _id; } 726}; 727 728// A single WatcherThread is used for simulating timer interrupts. 729class WatcherThread: public Thread { 730 friend class VMStructs; 731 public: 732 virtual void run(); 733 734 private: 735 static WatcherThread* _watcher_thread; 736 737 static bool _startable; 738 // volatile due to at least one lock-free read 739 volatile static bool _should_terminate; 740 741 os::WatcherThreadCrashProtection* _crash_protection; 742 public: 743 enum SomeConstants { 744 delay_interval = 10 // interrupt delay in milliseconds 745 }; 746 747 // Constructor 748 WatcherThread(); 749 750 // Tester 751 bool is_Watcher_thread() const { return true; } 752 753 // Printing 754 char* name() const { return (char*)"VM Periodic Task Thread"; } 755 void print_on(outputStream* st) const; 756 void unpark(); 757 758 // Returns the single instance of WatcherThread 759 static WatcherThread* watcher_thread() { return _watcher_thread; } 760 761 // Create and start the single instance of WatcherThread, or stop it on shutdown 762 static void start(); 763 static void stop(); 764 // Only allow start once the VM is sufficiently initialized 765 // Otherwise the first task to enroll will trigger the start 766 static void make_startable(); 767 768 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) { 769 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread"); 770 _crash_protection = crash_protection; 771 } 772 773 bool has_crash_protection() const { return _crash_protection != NULL; } 774 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; } 775 776 private: 777 int sleep() const; 778}; 779 780 781class CompilerThread; 782 783typedef void (*ThreadFunction)(JavaThread*, TRAPS); 784 785class JavaThread: public Thread { 786 friend class VMStructs; 787 friend class JVMCIVMStructs; 788 friend class WhiteBox; 789 private: 790 JavaThread* _next; // The next thread in the Threads list 791 oop _threadObj; // The Java level thread object 792 793#ifdef ASSERT 794 private: 795 int _java_call_counter; 796 797 public: 798 int java_call_counter() { return _java_call_counter; } 799 void inc_java_call_counter() { _java_call_counter++; } 800 void dec_java_call_counter() { 801 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 802 _java_call_counter--; 803 } 804 private: // restore original namespace restriction 805#endif // ifdef ASSERT 806 807#ifndef PRODUCT 808 public: 809 enum { 810 jump_ring_buffer_size = 16 811 }; 812 private: // restore original namespace restriction 813#endif 814 815 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 816 817 ThreadFunction _entry_point; 818 819 JNIEnv _jni_environment; 820 821 // Deopt support 822 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 823 824 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we 825 // transition out of native 826 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized 827 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 828 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 829 // Because deoptimization is lazy we must save jvmti requests to set locals 830 // in compiled frames until we deoptimize and we have an interpreter frame. 831 // This holds the pointer to array (yeah like there might be more than one) of 832 // description of compiled vframes that have locals that need to be updated. 833 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; 834 835 // Handshake value for fixing 6243940. We need a place for the i2c 836 // adapter to store the callee Method*. This value is NEVER live 837 // across a gc point so it does NOT have to be gc'd 838 // The handshake is open ended since we can't be certain that it will 839 // be NULLed. This is because we rarely ever see the race and end up 840 // in handle_wrong_method which is the backend of the handshake. See 841 // code in i2c adapters and handle_wrong_method. 842 843 Method* _callee_target; 844 845 // Used to pass back results to the interpreter or generated code running Java code. 846 oop _vm_result; // oop result is GC-preserved 847 Metadata* _vm_result_2; // non-oop result 848 849 // See ReduceInitialCardMarks: this holds the precise space interval of 850 // the most recent slow path allocation for which compiled code has 851 // elided card-marks for performance along the fast-path. 852 MemRegion _deferred_card_mark; 853 854 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 855 // allocated during deoptimization 856 // and by JNI_MonitorEnter/Exit 857 858 // Async. requests support 859 enum AsyncRequests { 860 _no_async_condition = 0, 861 _async_exception, 862 _async_unsafe_access_error 863 }; 864 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request 865 oop _pending_async_exception; 866 867 // Safepoint support 868 public: // Expose _thread_state for SafeFetchInt() 869 volatile JavaThreadState _thread_state; 870 private: 871 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint 872 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 873 874 // JavaThread termination support 875 enum TerminatedTypes { 876 _not_terminated = 0xDEAD - 2, 877 _thread_exiting, // JavaThread::exit() has been called for this thread 878 _thread_terminated, // JavaThread is removed from thread list 879 _vm_exited // JavaThread is still executing native code, but VM is terminated 880 // only VM_Exit can set _vm_exited 881 }; 882 883 // In general a JavaThread's _terminated field transitions as follows: 884 // 885 // _not_terminated => _thread_exiting => _thread_terminated 886 // 887 // _vm_exited is a special value to cover the case of a JavaThread 888 // executing native code after the VM itself is terminated. 889 volatile TerminatedTypes _terminated; 890 // suspend/resume support 891 volatile bool _suspend_equivalent; // Suspend equivalent condition 892 jint _in_deopt_handler; // count of deoptimization 893 // handlers thread is in 894 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 895 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 896 // never locked) when throwing an exception. Used by interpreter only. 897 898 // JNI attach states: 899 enum JNIAttachStates { 900 _not_attaching_via_jni = 1, // thread is not attaching via JNI 901 _attaching_via_jni, // thread is attaching via JNI 902 _attached_via_jni // thread has attached via JNI 903 }; 904 905 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 906 // A native thread that is attaching via JNI starts with a value 907 // of _attaching_via_jni and transitions to _attached_via_jni. 908 volatile JNIAttachStates _jni_attach_state; 909 910 public: 911 // State of the stack guard pages for this thread. 912 enum StackGuardState { 913 stack_guard_unused, // not needed 914 stack_guard_reserved_disabled, 915 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow 916 stack_guard_enabled // enabled 917 }; 918 919 private: 920 921#if INCLUDE_JVMCI 922 // The _pending_* fields below are used to communicate extra information 923 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. 924 925 // Communicates the DeoptReason and DeoptAction of the uncommon trap 926 int _pending_deoptimization; 927 928 // Specifies whether the uncommon trap is to bci 0 of a synchronized method 929 // before the monitor has been acquired. 930 bool _pending_monitorenter; 931 932 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter 933 bool _pending_transfer_to_interpreter; 934 935 // An object that JVMCI compiled code can use to further describe and 936 // uniquely identify the speculative optimization guarded by the uncommon trap 937 oop _pending_failed_speculation; 938 939 // These fields are mutually exclusive in terms of live ranges. 940 union { 941 // Communicates the pc at which the most recent implicit exception occurred 942 // from the signal handler to a deoptimization stub. 943 address _implicit_exception_pc; 944 945 // Communicates an alternative call target to an i2c stub from a JavaCall . 946 address _alternate_call_target; 947 } _jvmci; 948 949 // Support for high precision, thread sensitive counters in JVMCI compiled code. 950 jlong* _jvmci_counters; 951 952 public: 953 static jlong* _jvmci_old_thread_counters; 954 static void collect_counters(typeArrayOop array); 955 private: 956#endif // INCLUDE_JVMCI 957 958 StackGuardState _stack_guard_state; 959 960 // Precompute the limit of the stack as used in stack overflow checks. 961 // We load it from here to simplify the stack overflow check in assembly. 962 address _stack_overflow_limit; 963 address _reserved_stack_activation; 964 965 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 966 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 967 // code) 968 volatile oop _exception_oop; // Exception thrown in compiled code 969 volatile address _exception_pc; // PC where exception happened 970 volatile address _exception_handler_pc; // PC for handler of exception 971 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 972 973 private: 974 // support for JNI critical regions 975 jint _jni_active_critical; // count of entries into JNI critical region 976 977 // Checked JNI: function name requires exception check 978 char* _pending_jni_exception_check_fn; 979 980 // For deadlock detection. 981 int _depth_first_number; 982 983 // JVMTI PopFrame support 984 // This is set to popframe_pending to signal that top Java frame should be popped immediately 985 int _popframe_condition; 986 987 // If reallocation of scalar replaced objects fails, we throw OOM 988 // and during exception propagation, pop the top 989 // _frames_to_pop_failed_realloc frames, the ones that reference 990 // failed reallocations. 991 int _frames_to_pop_failed_realloc; 992 993#ifndef PRODUCT 994 int _jmp_ring_index; 995 struct { 996 // We use intptr_t instead of address so debugger doesn't try and display strings 997 intptr_t _target; 998 intptr_t _instruction; 999 const char* _file; 1000 int _line; 1001 } _jmp_ring[jump_ring_buffer_size]; 1002#endif // PRODUCT 1003 1004#if INCLUDE_ALL_GCS 1005 // Support for G1 barriers 1006 1007 SATBMarkQueue _satb_mark_queue; // Thread-local log for SATB barrier. 1008 // Set of all such queues. 1009 static SATBMarkQueueSet _satb_mark_queue_set; 1010 1011 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. 1012 // Set of all such queues. 1013 static DirtyCardQueueSet _dirty_card_queue_set; 1014 1015 void flush_barrier_queues(); 1016#endif // INCLUDE_ALL_GCS 1017 1018 friend class VMThread; 1019 friend class ThreadWaitTransition; 1020 friend class VM_Exit; 1021 1022 void initialize(); // Initialized the instance variables 1023 1024 public: 1025 // Constructor 1026 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads 1027 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 1028 ~JavaThread(); 1029 1030#ifdef ASSERT 1031 // verify this JavaThread hasn't be published in the Threads::list yet 1032 void verify_not_published(); 1033#endif 1034 1035 //JNI functiontable getter/setter for JVMTI jni function table interception API. 1036 void set_jni_functions(struct JNINativeInterface_* functionTable) { 1037 _jni_environment.functions = functionTable; 1038 } 1039 struct JNINativeInterface_* get_jni_functions() { 1040 return (struct JNINativeInterface_ *)_jni_environment.functions; 1041 } 1042 1043 // This function is called at thread creation to allow 1044 // platform specific thread variables to be initialized. 1045 void cache_global_variables(); 1046 1047 // Executes Shutdown.shutdown() 1048 void invoke_shutdown_hooks(); 1049 1050 // Cleanup on thread exit 1051 enum ExitType { 1052 normal_exit, 1053 jni_detach 1054 }; 1055 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 1056 1057 void cleanup_failed_attach_current_thread(); 1058 1059 // Testers 1060 virtual bool is_Java_thread() const { return true; } 1061 virtual bool can_call_java() const { return true; } 1062 1063 // Thread chain operations 1064 JavaThread* next() const { return _next; } 1065 void set_next(JavaThread* p) { _next = p; } 1066 1067 // Thread oop. threadObj() can be NULL for initial JavaThread 1068 // (or for threads attached via JNI) 1069 oop threadObj() const { return _threadObj; } 1070 void set_threadObj(oop p) { _threadObj = p; } 1071 1072 ThreadPriority java_priority() const; // Read from threadObj() 1073 1074 // Prepare thread and add to priority queue. If a priority is 1075 // not specified, use the priority of the thread object. Threads_lock 1076 // must be held while this function is called. 1077 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 1078 void prepare_ext(); 1079 1080 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 1081 address saved_exception_pc() { return _saved_exception_pc; } 1082 1083 1084 ThreadFunction entry_point() const { return _entry_point; } 1085 1086 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1087 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS); 1088 1089 // Last frame anchor routines 1090 1091 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1092 1093 // last_Java_sp 1094 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1095 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1096 1097 // last_Java_pc 1098 1099 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1100 1101 // Safepoint support 1102#if !(defined(PPC64) || defined(AARCH64)) 1103 JavaThreadState thread_state() const { return _thread_state; } 1104 void set_thread_state(JavaThreadState s) { _thread_state = s; } 1105#else 1106 // Use membars when accessing volatile _thread_state. See 1107 // Threads::create_vm() for size checks. 1108 inline JavaThreadState thread_state() const; 1109 inline void set_thread_state(JavaThreadState s); 1110#endif 1111 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } 1112 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } 1113 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } 1114 1115 // thread has called JavaThread::exit() or is terminated 1116 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } 1117 // thread is terminated (no longer on the threads list); we compare 1118 // against the two non-terminated values so that a freed JavaThread 1119 // will also be considered terminated. 1120 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } 1121 void set_terminated(TerminatedTypes t) { _terminated = t; } 1122 // special for Threads::remove() which is static: 1123 void set_terminated_value() { _terminated = _thread_terminated; } 1124 void block_if_vm_exited(); 1125 1126 bool doing_unsafe_access() { return _doing_unsafe_access; } 1127 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1128 1129 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1130 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1131 1132 // Suspend/resume support for JavaThread 1133 private: 1134 inline void set_ext_suspended(); 1135 inline void clear_ext_suspended(); 1136 1137 public: 1138 void java_suspend(); 1139 void java_resume(); 1140 int java_suspend_self(); 1141 1142 void check_and_wait_while_suspended() { 1143 assert(JavaThread::current() == this, "sanity check"); 1144 1145 bool do_self_suspend; 1146 do { 1147 // were we externally suspended while we were waiting? 1148 do_self_suspend = handle_special_suspend_equivalent_condition(); 1149 if (do_self_suspend) { 1150 // don't surprise the thread that suspended us by returning 1151 java_suspend_self(); 1152 set_suspend_equivalent(); 1153 } 1154 } while (do_self_suspend); 1155 } 1156 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); 1157 // Check for async exception in addition to safepoint and suspend request. 1158 static void check_special_condition_for_native_trans(JavaThread *thread); 1159 1160 // Same as check_special_condition_for_native_trans but finishes the 1161 // transition into thread_in_Java mode so that it can potentially 1162 // block. 1163 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); 1164 1165 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); 1166 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { 1167 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1168 // Warning: is_ext_suspend_completed() may temporarily drop the 1169 // SR_lock to allow the thread to reach a stable thread state if 1170 // it is currently in a transient thread state. 1171 return is_ext_suspend_completed(false /* !called_by_wait */, 1172 SuspendRetryDelay, bits); 1173 } 1174 1175 // We cannot allow wait_for_ext_suspend_completion() to run forever or 1176 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally 1177 // passed as the count and delay parameters. Experiments with specific 1178 // calls to wait_for_ext_suspend_completion() can be done by passing 1179 // other values in the code. Experiments with all calls can be done 1180 // via the appropriate -XX options. 1181 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); 1182 1183 inline void set_external_suspend(); 1184 inline void clear_external_suspend(); 1185 1186 inline void set_deopt_suspend(); 1187 inline void clear_deopt_suspend(); 1188 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } 1189 1190 bool is_external_suspend() const { 1191 return (_suspend_flags & _external_suspend) != 0; 1192 } 1193 // Whenever a thread transitions from native to vm/java it must suspend 1194 // if external|deopt suspend is present. 1195 bool is_suspend_after_native() const { 1196 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0; 1197 } 1198 1199 // external suspend request is completed 1200 bool is_ext_suspended() const { 1201 return (_suspend_flags & _ext_suspended) != 0; 1202 } 1203 1204 bool is_external_suspend_with_lock() const { 1205 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1206 return is_external_suspend(); 1207 } 1208 1209 // Special method to handle a pending external suspend request 1210 // when a suspend equivalent condition lifts. 1211 bool handle_special_suspend_equivalent_condition() { 1212 assert(is_suspend_equivalent(), 1213 "should only be called in a suspend equivalence condition"); 1214 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1215 bool ret = is_external_suspend(); 1216 if (!ret) { 1217 // not about to self-suspend so clear suspend equivalence 1218 clear_suspend_equivalent(); 1219 } 1220 // implied else: 1221 // We have a pending external suspend request so we leave the 1222 // suspend_equivalent flag set until java_suspend_self() sets 1223 // the ext_suspended flag and clears the suspend_equivalent 1224 // flag. This insures that wait_for_ext_suspend_completion() 1225 // will return consistent values. 1226 return ret; 1227 } 1228 1229 // utility methods to see if we are doing some kind of suspension 1230 bool is_being_ext_suspended() const { 1231 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1232 return is_ext_suspended() || is_external_suspend(); 1233 } 1234 1235 bool is_suspend_equivalent() const { return _suspend_equivalent; } 1236 1237 void set_suspend_equivalent() { _suspend_equivalent = true; } 1238 void clear_suspend_equivalent() { _suspend_equivalent = false; } 1239 1240 // Thread.stop support 1241 void send_thread_stop(oop throwable); 1242 AsyncRequests clear_special_runtime_exit_condition() { 1243 AsyncRequests x = _special_runtime_exit_condition; 1244 _special_runtime_exit_condition = _no_async_condition; 1245 return x; 1246 } 1247 1248 // Are any async conditions present? 1249 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } 1250 1251 void check_and_handle_async_exceptions(bool check_unsafe_error = true); 1252 1253 // these next two are also used for self-suspension and async exception support 1254 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1255 1256 // Return true if JavaThread has an asynchronous condition or 1257 // if external suspension is requested. 1258 bool has_special_runtime_exit_condition() { 1259 // We call is_external_suspend() last since external suspend should 1260 // be less common. Because we don't use is_external_suspend_with_lock 1261 // it is possible that we won't see an asynchronous external suspend 1262 // request that has just gotten started, i.e., SR_lock grabbed but 1263 // _external_suspend field change either not made yet or not visible 1264 // yet. However, this is okay because the request is asynchronous and 1265 // we will see the new flag value the next time through. It's also 1266 // possible that the external suspend request is dropped after 1267 // we have checked is_external_suspend(), we will recheck its value 1268 // under SR_lock in java_suspend_self(). 1269 return (_special_runtime_exit_condition != _no_async_condition) || 1270 is_external_suspend() || is_deopt_suspend(); 1271 } 1272 1273 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } 1274 1275 inline void set_pending_async_exception(oop e); 1276 1277 // Fast-locking support 1278 bool is_lock_owned(address adr) const; 1279 1280 // Accessors for vframe array top 1281 // The linked list of vframe arrays are sorted on sp. This means when we 1282 // unpack the head must contain the vframe array to unpack. 1283 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1284 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1285 1286 // Side structure for deferring update of java frame locals until deopt occurs 1287 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } 1288 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } 1289 1290 // These only really exist to make debugging deopt problems simpler 1291 1292 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1293 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1294 1295 // The special resourceMark used during deoptimization 1296 1297 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1298 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1299 1300 intptr_t* must_deopt_id() { return _must_deopt_id; } 1301 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } 1302 void clear_must_deopt_id() { _must_deopt_id = NULL; } 1303 1304 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } 1305 nmethod* deopt_nmethod() { return _deopt_nmethod; } 1306 1307 Method* callee_target() const { return _callee_target; } 1308 void set_callee_target (Method* x) { _callee_target = x; } 1309 1310 // Oop results of vm runtime calls 1311 oop vm_result() const { return _vm_result; } 1312 void set_vm_result (oop x) { _vm_result = x; } 1313 1314 Metadata* vm_result_2() const { return _vm_result_2; } 1315 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1316 1317 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1318 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1319 1320#if INCLUDE_JVMCI 1321 int pending_deoptimization() const { return _pending_deoptimization; } 1322 oop pending_failed_speculation() const { return _pending_failed_speculation; } 1323 bool has_pending_monitorenter() const { return _pending_monitorenter; } 1324 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } 1325 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } 1326 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; } 1327 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } 1328 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; } 1329 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; } 1330#endif // INCLUDE_JVMCI 1331 1332 // Exception handling for compiled methods 1333 oop exception_oop() const { return _exception_oop; } 1334 address exception_pc() const { return _exception_pc; } 1335 address exception_handler_pc() const { return _exception_handler_pc; } 1336 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1337 1338 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); } 1339 void set_exception_pc(address a) { _exception_pc = a; } 1340 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1341 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1342 1343 void clear_exception_oop_and_pc() { 1344 set_exception_oop(NULL); 1345 set_exception_pc(NULL); 1346 } 1347 1348 // Stack overflow support 1349 inline size_t stack_available(address cur_sp); 1350 address stack_reserved_zone_base() { 1351 return stack_yellow_zone_base(); } 1352 size_t stack_reserved_zone_size() { 1353 return StackReservedPages * os::vm_page_size(); } 1354 address stack_yellow_zone_base() { 1355 return (address)(stack_base() - 1356 (stack_size() - 1357 (stack_red_zone_size() + stack_yellow_zone_size()))); 1358 } 1359 size_t stack_yellow_zone_size() { 1360 return StackYellowPages * os::vm_page_size() + stack_reserved_zone_size(); 1361 } 1362 address stack_red_zone_base() { 1363 return (address)(stack_base() - (stack_size() - stack_red_zone_size())); 1364 } 1365 size_t stack_red_zone_size() { return StackRedPages * os::vm_page_size(); } 1366 bool in_stack_reserved_zone(address a) { 1367 return (a <= stack_reserved_zone_base()) && (a >= (address)((intptr_t)stack_reserved_zone_base() - stack_reserved_zone_size())); 1368 } 1369 bool in_stack_yellow_zone(address a) { 1370 return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); 1371 } 1372 bool in_stack_red_zone(address a) { 1373 return (a <= stack_red_zone_base()) && 1374 (a >= (address)((intptr_t)stack_base() - stack_size())); 1375 } 1376 1377 void create_stack_guard_pages(); 1378 void remove_stack_guard_pages(); 1379 1380 void enable_stack_reserved_zone(); 1381 void disable_stack_reserved_zone(); 1382 void enable_stack_yellow_zone(); 1383 void disable_stack_yellow_zone(); 1384 void enable_stack_red_zone(); 1385 void disable_stack_red_zone(); 1386 1387 inline bool stack_guard_zone_unused(); 1388 inline bool stack_yellow_zone_disabled(); 1389 inline bool stack_reserved_zone_disabled(); 1390 inline bool stack_guards_enabled(); 1391 1392 address reserved_stack_activation() const { return _reserved_stack_activation; } 1393 void set_reserved_stack_activation(address addr) { 1394 assert(_reserved_stack_activation == stack_base() 1395 || _reserved_stack_activation == NULL 1396 || addr == stack_base(), "Must not be set twice"); 1397 _reserved_stack_activation = addr; 1398 } 1399 1400 // Attempt to reguard the stack after a stack overflow may have occurred. 1401 // Returns true if (a) guard pages are not needed on this thread, (b) the 1402 // pages are already guarded, or (c) the pages were successfully reguarded. 1403 // Returns false if there is not enough stack space to reguard the pages, in 1404 // which case the caller should unwind a frame and try again. The argument 1405 // should be the caller's (approximate) sp. 1406 bool reguard_stack(address cur_sp); 1407 // Similar to above but see if current stackpoint is out of the guard area 1408 // and reguard if possible. 1409 bool reguard_stack(void); 1410 1411 address stack_overflow_limit() { return _stack_overflow_limit; } 1412 void set_stack_overflow_limit() { 1413 _stack_overflow_limit = _stack_base - _stack_size + 1414 ((StackShadowPages + 1415 StackReservedPages + 1416 StackYellowPages + 1417 StackRedPages) * os::vm_page_size()); 1418 } 1419 1420 // Misc. accessors/mutators 1421 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1422 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1423 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1424 1425#ifndef PRODUCT 1426 void record_jump(address target, address instr, const char* file, int line); 1427#endif // PRODUCT 1428 1429 // For assembly stub generation 1430 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } 1431#ifndef PRODUCT 1432 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); } 1433 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); } 1434#endif // PRODUCT 1435 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } 1436 static ByteSize last_Java_sp_offset() { 1437 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1438 } 1439 static ByteSize last_Java_pc_offset() { 1440 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1441 } 1442 static ByteSize frame_anchor_offset() { 1443 return byte_offset_of(JavaThread, _anchor); 1444 } 1445 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } 1446 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } 1447 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } 1448 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } 1449 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } 1450 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } 1451#if INCLUDE_JVMCI 1452 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); } 1453 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); } 1454 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); } 1455 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); } 1456 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); } 1457 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); } 1458#endif // INCLUDE_JVMCI 1459 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } 1460 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } 1461 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1462 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } 1463 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1464 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); } 1465 static ByteSize reserved_stack_activation_offset() { return byte_offset_of(JavaThread, _reserved_stack_activation); } 1466 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } 1467 1468 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1469 static ByteSize should_post_on_exceptions_flag_offset() { 1470 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1471 } 1472 1473#if INCLUDE_ALL_GCS 1474 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } 1475 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } 1476#endif // INCLUDE_ALL_GCS 1477 1478 // Returns the jni environment for this thread 1479 JNIEnv* jni_environment() { return &_jni_environment; } 1480 1481 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1482 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1483 // Only return NULL if thread is off the thread list; starting to 1484 // exit should not return NULL. 1485 if (thread_from_jni_env->is_terminated()) { 1486 thread_from_jni_env->block_if_vm_exited(); 1487 return NULL; 1488 } else { 1489 return thread_from_jni_env; 1490 } 1491 } 1492 1493 // JNI critical regions. These can nest. 1494 bool in_critical() { return _jni_active_critical > 0; } 1495 bool in_last_critical() { return _jni_active_critical == 1; } 1496 void enter_critical() { 1497 assert(Thread::current() == this || 1498 (Thread::current()->is_VM_thread() && 1499 SafepointSynchronize::is_synchronizing()), 1500 "this must be current thread or synchronizing"); 1501 _jni_active_critical++; 1502 } 1503 void exit_critical() { 1504 assert(Thread::current() == this, "this must be current thread"); 1505 _jni_active_critical--; 1506 assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); 1507 } 1508 1509 // Checked JNI, is the programmer required to check for exceptions, specify which function name 1510 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1511 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1512 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1513 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1514 1515 // For deadlock detection 1516 int depth_first_number() { return _depth_first_number; } 1517 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1518 1519 private: 1520 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1521 1522 public: 1523 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1524 void add_monitor_chunk(MonitorChunk* chunk); 1525 void remove_monitor_chunk(MonitorChunk* chunk); 1526 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1527 void inc_in_deopt_handler() { _in_deopt_handler++; } 1528 void dec_in_deopt_handler() { 1529 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1530 if (_in_deopt_handler > 0) { // robustness 1531 _in_deopt_handler--; 1532 } 1533 } 1534 1535 private: 1536 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1537 1538 public: 1539 1540 // Frame iteration; calls the function f for all frames on the stack 1541 void frames_do(void f(frame*, const RegisterMap*)); 1542 1543 // Memory operations 1544 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1545 1546 // Sweeper operations 1547 void nmethods_do(CodeBlobClosure* cf); 1548 1549 // RedefineClasses Support 1550 void metadata_do(void f(Metadata*)); 1551 1552 // Misc. operations 1553 char* name() const { return (char*)get_thread_name(); } 1554 void print_on(outputStream* st) const; 1555 void print_value(); 1556 void print_thread_state_on(outputStream*) const PRODUCT_RETURN; 1557 void print_thread_state() const PRODUCT_RETURN; 1558 void print_on_error(outputStream* st, char* buf, int buflen) const; 1559 void verify(); 1560 const char* get_thread_name() const; 1561 private: 1562 // factor out low-level mechanics for use in both normal and error cases 1563 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1564 public: 1565 const char* get_threadgroup_name() const; 1566 const char* get_parent_name() const; 1567 1568 // Accessing frames 1569 frame last_frame() { 1570 _anchor.make_walkable(this); 1571 return pd_last_frame(); 1572 } 1573 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1574 1575 // Returns method at 'depth' java or native frames down the stack 1576 // Used for security checks 1577 Klass* security_get_caller_class(int depth); 1578 1579 // Print stack trace in external format 1580 void print_stack_on(outputStream* st); 1581 void print_stack() { print_stack_on(tty); } 1582 1583 // Print stack traces in various internal formats 1584 void trace_stack() PRODUCT_RETURN; 1585 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1586 void trace_frames() PRODUCT_RETURN; 1587 void trace_oops() PRODUCT_RETURN; 1588 1589 // Print an annotated view of the stack frames 1590 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1591 void validate_frame_layout() { 1592 print_frame_layout(0, true); 1593 } 1594 1595 // Returns the number of stack frames on the stack 1596 int depth() const; 1597 1598 // Function for testing deoptimization 1599 void deoptimize(); 1600 void make_zombies(); 1601 1602 void deoptimized_wrt_marked_nmethods(); 1603 1604 // Profiling operation (see fprofile.cpp) 1605 public: 1606 bool profile_last_Java_frame(frame* fr); 1607 1608 private: 1609 ThreadProfiler* _thread_profiler; 1610 private: 1611 friend class FlatProfiler; // uses both [gs]et_thread_profiler. 1612 friend class FlatProfilerTask; // uses get_thread_profiler. 1613 friend class ThreadProfilerMark; // uses get_thread_profiler. 1614 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } 1615 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { 1616 ThreadProfiler* result = _thread_profiler; 1617 _thread_profiler = tp; 1618 return result; 1619 } 1620 1621 public: 1622 // Returns the running thread as a JavaThread 1623 static inline JavaThread* current(); 1624 1625 // Returns the active Java thread. Do not use this if you know you are calling 1626 // from a JavaThread, as it's slower than JavaThread::current. If called from 1627 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1628 // operation. You may not want that either. 1629 static JavaThread* active(); 1630 1631 inline CompilerThread* as_CompilerThread(); 1632 1633 public: 1634 virtual void run(); 1635 void thread_main_inner(); 1636 1637 private: 1638 // PRIVILEGED STACK 1639 PrivilegedElement* _privileged_stack_top; 1640 GrowableArray<oop>* _array_for_gc; 1641 public: 1642 1643 // Returns the privileged_stack information. 1644 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } 1645 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } 1646 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } 1647 1648 public: 1649 // Thread local information maintained by JVMTI. 1650 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1651 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1652 // getter is used to get this JavaThread's JvmtiThreadState if it has 1653 // one which means NULL can be returned. JvmtiThreadState::state_for() 1654 // is used to get the specified JavaThread's JvmtiThreadState if it has 1655 // one or it allocates a new JvmtiThreadState for the JavaThread and 1656 // returns it. JvmtiThreadState::state_for() will return NULL only if 1657 // the specified JavaThread is exiting. 1658 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1659 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1660 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } 1661 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } 1662 1663 // JVMTI PopFrame support 1664 // Setting and clearing popframe_condition 1665 // All of these enumerated values are bits. popframe_pending 1666 // indicates that a PopFrame() has been requested and not yet been 1667 // completed. popframe_processing indicates that that PopFrame() is in 1668 // the process of being completed. popframe_force_deopt_reexecution_bit 1669 // indicates that special handling is required when returning to a 1670 // deoptimized caller. 1671 enum PopCondition { 1672 popframe_inactive = 0x00, 1673 popframe_pending_bit = 0x01, 1674 popframe_processing_bit = 0x02, 1675 popframe_force_deopt_reexecution_bit = 0x04 1676 }; 1677 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1678 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1679 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1680 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1681 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1682 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1683 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1684 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1685#ifdef CC_INTERP 1686 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } 1687 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } 1688 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1689 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1690 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1691#endif 1692 1693 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1694 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1695 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1696 1697 private: 1698 // Saved incoming arguments to popped frame. 1699 // Used only when popped interpreted frame returns to deoptimized frame. 1700 void* _popframe_preserved_args; 1701 int _popframe_preserved_args_size; 1702 1703 public: 1704 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1705 void* popframe_preserved_args(); 1706 ByteSize popframe_preserved_args_size(); 1707 WordSize popframe_preserved_args_size_in_words(); 1708 void popframe_free_preserved_args(); 1709 1710 1711 private: 1712 JvmtiThreadState *_jvmti_thread_state; 1713 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; 1714 1715 // Used by the interpreter in fullspeed mode for frame pop, method 1716 // entry, method exit and single stepping support. This field is 1717 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. 1718 // It can be set to zero asynchronously (i.e., without a VM operation 1719 // or a lock) so we have to be very careful. 1720 int _interp_only_mode; 1721 1722 public: 1723 // used by the interpreter for fullspeed debugging support (see above) 1724 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1725 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1726 int get_interp_only_mode() { return _interp_only_mode; } 1727 void increment_interp_only_mode() { ++_interp_only_mode; } 1728 void decrement_interp_only_mode() { --_interp_only_mode; } 1729 1730 // support for cached flag that indicates whether exceptions need to be posted for this thread 1731 // if this is false, we can avoid deoptimizing when events are thrown 1732 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1733 private: 1734 int _should_post_on_exceptions_flag; 1735 1736 public: 1737 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1738 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1739 1740 private: 1741 ThreadStatistics *_thread_stat; 1742 1743 public: 1744 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1745 1746 // Return a blocker object for which this thread is blocked parking. 1747 oop current_park_blocker(); 1748 1749 private: 1750 static size_t _stack_size_at_create; 1751 1752 public: 1753 static inline size_t stack_size_at_create(void) { 1754 return _stack_size_at_create; 1755 } 1756 static inline void set_stack_size_at_create(size_t value) { 1757 _stack_size_at_create = value; 1758 } 1759 1760#if INCLUDE_ALL_GCS 1761 // SATB marking queue support 1762 SATBMarkQueue& satb_mark_queue() { return _satb_mark_queue; } 1763 static SATBMarkQueueSet& satb_mark_queue_set() { 1764 return _satb_mark_queue_set; 1765 } 1766 1767 // Dirty card queue support 1768 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } 1769 static DirtyCardQueueSet& dirty_card_queue_set() { 1770 return _dirty_card_queue_set; 1771 } 1772#endif // INCLUDE_ALL_GCS 1773 1774 // This method initializes the SATB and dirty card queues before a 1775 // JavaThread is added to the Java thread list. Right now, we don't 1776 // have to do anything to the dirty card queue (it should have been 1777 // activated when the thread was created), but we have to activate 1778 // the SATB queue if the thread is created while a marking cycle is 1779 // in progress. The activation / de-activation of the SATB queues at 1780 // the beginning / end of a marking cycle is done during safepoints 1781 // so we have to make sure this method is called outside one to be 1782 // able to safely read the active field of the SATB queue set. Right 1783 // now, it is called just before the thread is added to the Java 1784 // thread list in the Threads::add() method. That method is holding 1785 // the Threads_lock which ensures we are outside a safepoint. We 1786 // cannot do the obvious and set the active field of the SATB queue 1787 // when the thread is created given that, in some cases, safepoints 1788 // might happen between the JavaThread constructor being called and the 1789 // thread being added to the Java thread list (an example of this is 1790 // when the structure for the DestroyJavaVM thread is created). 1791#if INCLUDE_ALL_GCS 1792 void initialize_queues(); 1793#else // INCLUDE_ALL_GCS 1794 void initialize_queues() { } 1795#endif // INCLUDE_ALL_GCS 1796 1797 // Machine dependent stuff 1798#ifdef TARGET_OS_ARCH_linux_x86 1799# include "thread_linux_x86.hpp" 1800#endif 1801#ifdef TARGET_OS_ARCH_linux_sparc 1802# include "thread_linux_sparc.hpp" 1803#endif 1804#ifdef TARGET_OS_ARCH_linux_zero 1805# include "thread_linux_zero.hpp" 1806#endif 1807#ifdef TARGET_OS_ARCH_solaris_x86 1808# include "thread_solaris_x86.hpp" 1809#endif 1810#ifdef TARGET_OS_ARCH_solaris_sparc 1811# include "thread_solaris_sparc.hpp" 1812#endif 1813#ifdef TARGET_OS_ARCH_windows_x86 1814# include "thread_windows_x86.hpp" 1815#endif 1816#ifdef TARGET_OS_ARCH_linux_arm 1817# include "thread_linux_arm.hpp" 1818#endif 1819#ifdef TARGET_OS_ARCH_linux_ppc 1820# include "thread_linux_ppc.hpp" 1821#endif 1822#ifdef TARGET_OS_ARCH_linux_aarch64 1823# include "thread_linux_aarch64.hpp" 1824#endif 1825#ifdef TARGET_OS_ARCH_aix_ppc 1826# include "thread_aix_ppc.hpp" 1827#endif 1828#ifdef TARGET_OS_ARCH_bsd_x86 1829# include "thread_bsd_x86.hpp" 1830#endif 1831#ifdef TARGET_OS_ARCH_bsd_zero 1832# include "thread_bsd_zero.hpp" 1833#endif 1834 1835 1836 public: 1837 void set_blocked_on_compilation(bool value) { 1838 _blocked_on_compilation = value; 1839 } 1840 1841 bool blocked_on_compilation() { 1842 return _blocked_on_compilation; 1843 } 1844 protected: 1845 bool _blocked_on_compilation; 1846 1847 1848 // JSR166 per-thread parker 1849 private: 1850 Parker* _parker; 1851 public: 1852 Parker* parker() { return _parker; } 1853 1854 // Biased locking support 1855 private: 1856 GrowableArray<MonitorInfo*>* _cached_monitor_info; 1857 public: 1858 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 1859 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 1860 1861 // clearing/querying jni attach status 1862 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1863 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1864 inline void set_done_attaching_via_jni(); 1865 private: 1866 // This field is used to determine if a thread has claimed 1867 // a par_id: it is UINT_MAX if the thread has not claimed a par_id; 1868 // otherwise its value is the par_id that has been claimed. 1869 uint _claimed_par_id; 1870 public: 1871 uint get_claimed_par_id() { return _claimed_par_id; } 1872 void set_claimed_par_id(uint id) { _claimed_par_id = id; } 1873}; 1874 1875// Inline implementation of JavaThread::current 1876inline JavaThread* JavaThread::current() { 1877 Thread* thread = Thread::current(); 1878 assert(thread->is_Java_thread(), "just checking"); 1879 return (JavaThread*)thread; 1880} 1881 1882inline CompilerThread* JavaThread::as_CompilerThread() { 1883 assert(is_Compiler_thread(), "just checking"); 1884 return (CompilerThread*)this; 1885} 1886 1887// Dedicated thread to sweep the code cache 1888class CodeCacheSweeperThread : public JavaThread { 1889 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper 1890 public: 1891 CodeCacheSweeperThread(); 1892 // Track the nmethod currently being scanned by the sweeper 1893 void set_scanned_nmethod(nmethod* nm) { 1894 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value"); 1895 _scanned_nmethod = nm; 1896 } 1897 1898 // Hide sweeper thread from external view. 1899 bool is_hidden_from_external_view() const { return true; } 1900 1901 bool is_Code_cache_sweeper_thread() const { return true; } 1902 // GC support 1903 // Apply "f->do_oop" to all root oops in "this". 1904 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 1905 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1906}; 1907 1908// A thread used for Compilation. 1909class CompilerThread : public JavaThread { 1910 friend class VMStructs; 1911 private: 1912 CompilerCounters* _counters; 1913 1914 ciEnv* _env; 1915 CompileLog* _log; 1916 CompileTask* _task; 1917 CompileQueue* _queue; 1918 BufferBlob* _buffer_blob; 1919 1920 AbstractCompiler* _compiler; 1921 1922 public: 1923 1924 static CompilerThread* current(); 1925 1926 CompilerThread(CompileQueue* queue, CompilerCounters* counters); 1927 1928 bool is_Compiler_thread() const { return true; } 1929 1930 virtual bool can_call_java() const; 1931 1932 // Hide native compiler threads from external view. 1933 bool is_hidden_from_external_view() const { return !can_call_java(); } 1934 1935 void set_compiler(AbstractCompiler* c) { _compiler = c; } 1936 AbstractCompiler* compiler() const { return _compiler; } 1937 1938 CompileQueue* queue() const { return _queue; } 1939 CompilerCounters* counters() const { return _counters; } 1940 1941 // Get/set the thread's compilation environment. 1942 ciEnv* env() { return _env; } 1943 void set_env(ciEnv* env) { _env = env; } 1944 1945 BufferBlob* get_buffer_blob() const { return _buffer_blob; } 1946 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; } 1947 1948 // Get/set the thread's logging information 1949 CompileLog* log() { return _log; } 1950 void init_log(CompileLog* log) { 1951 // Set once, for good. 1952 assert(_log == NULL, "set only once"); 1953 _log = log; 1954 } 1955 1956#ifndef PRODUCT 1957 private: 1958 IdealGraphPrinter *_ideal_graph_printer; 1959 public: 1960 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } 1961 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } 1962#endif 1963 1964 // Get/set the thread's current task 1965 CompileTask* task() { return _task; } 1966 void set_task(CompileTask* task) { _task = task; } 1967}; 1968 1969inline CompilerThread* CompilerThread::current() { 1970 return JavaThread::current()->as_CompilerThread(); 1971} 1972 1973// The active thread queue. It also keeps track of the current used 1974// thread priorities. 1975class Threads: AllStatic { 1976 friend class VMStructs; 1977 private: 1978 static JavaThread* _thread_list; 1979 static int _number_of_threads; 1980 static int _number_of_non_daemon_threads; 1981 static int _return_code; 1982 static int _thread_claim_parity; 1983#ifdef ASSERT 1984 static bool _vm_complete; 1985#endif 1986 1987 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS); 1988 static void initialize_jsr292_core_classes(TRAPS); 1989 public: 1990 // Thread management 1991 // force_daemon is a concession to JNI, where we may need to add a 1992 // thread to the thread list before allocating its thread object 1993 static void add(JavaThread* p, bool force_daemon = false); 1994 static void remove(JavaThread* p); 1995 static bool includes(JavaThread* p); 1996 static JavaThread* first() { return _thread_list; } 1997 static void threads_do(ThreadClosure* tc); 1998 1999 // Initializes the vm and creates the vm thread 2000 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 2001 static void convert_vm_init_libraries_to_agents(); 2002 static void create_vm_init_libraries(); 2003 static void create_vm_init_agents(); 2004 static void shutdown_vm_agents(); 2005 static bool destroy_vm(); 2006 // Supported VM versions via JNI 2007 // Includes JNI_VERSION_1_1 2008 static jboolean is_supported_jni_version_including_1_1(jint version); 2009 // Does not include JNI_VERSION_1_1 2010 static jboolean is_supported_jni_version(jint version); 2011 2012 // The "thread claim parity" provides a way for threads to be claimed 2013 // by parallel worker tasks. 2014 // 2015 // Each thread contains a a "parity" field. A task will claim the 2016 // thread only if its parity field is the same as the global parity, 2017 // which is updated by calling change_thread_claim_parity(). 2018 // 2019 // For this to work change_thread_claim_parity() needs to be called 2020 // exactly once in sequential code before starting parallel tasks 2021 // that should claim threads. 2022 // 2023 // New threads get their parity set to 0 and change_thread_claim_parity() 2024 // never set the global parity to 0. 2025 static int thread_claim_parity() { return _thread_claim_parity; } 2026 static void change_thread_claim_parity(); 2027 static void assert_all_threads_claimed() NOT_DEBUG_RETURN; 2028 2029 // Apply "f->do_oop" to all root oops in all threads. 2030 // This version may only be called by sequential code. 2031 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 2032 // This version may be called by sequential or parallel code. 2033 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 2034 // This creates a list of GCTasks, one per thread. 2035 static void create_thread_roots_tasks(GCTaskQueue* q); 2036 // This creates a list of GCTasks, one per thread, for marking objects. 2037 static void create_thread_roots_marking_tasks(GCTaskQueue* q); 2038 2039 // Apply "f->do_oop" to roots in all threads that 2040 // are part of compiled frames 2041 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); 2042 2043 static void convert_hcode_pointers(); 2044 static void restore_hcode_pointers(); 2045 2046 // Sweeper 2047 static void nmethods_do(CodeBlobClosure* cf); 2048 2049 // RedefineClasses support 2050 static void metadata_do(void f(Metadata*)); 2051 static void metadata_handles_do(void f(Metadata*)); 2052 2053#ifdef ASSERT 2054 static bool is_vm_complete() { return _vm_complete; } 2055#endif 2056 2057 // Verification 2058 static void verify(); 2059 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); 2060 static void print(bool print_stacks, bool internal_format) { 2061 // this function is only used by debug.cpp 2062 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); 2063 } 2064 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 2065 2066 // Get Java threads that are waiting to enter a monitor. If doLock 2067 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2068 // VM needs to be at a safepoint. 2069 static GrowableArray<JavaThread*>* get_pending_threads(int count, 2070 address monitor, bool doLock); 2071 2072 // Get owning Java thread from the monitor's owner field. If doLock 2073 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2074 // VM needs to be at a safepoint. 2075 static JavaThread *owning_thread_from_monitor_owner(address owner, 2076 bool doLock); 2077 2078 // Number of threads on the active threads list 2079 static int number_of_threads() { return _number_of_threads; } 2080 // Number of non-daemon threads on the active threads list 2081 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 2082 2083 // Deoptimizes all frames tied to marked nmethods 2084 static void deoptimized_wrt_marked_nmethods(); 2085 2086 static JavaThread* find_java_thread_from_java_tid(jlong java_tid); 2087 2088}; 2089 2090 2091// Thread iterator 2092class ThreadClosure: public StackObj { 2093 public: 2094 virtual void do_thread(Thread* thread) = 0; 2095}; 2096 2097class SignalHandlerMark: public StackObj { 2098 private: 2099 Thread* _thread; 2100 public: 2101 SignalHandlerMark(Thread* t) { 2102 _thread = t; 2103 if (_thread) _thread->enter_signal_handler(); 2104 } 2105 ~SignalHandlerMark() { 2106 if (_thread) _thread->leave_signal_handler(); 2107 _thread = NULL; 2108 } 2109}; 2110 2111 2112#endif // SHARE_VM_RUNTIME_THREAD_HPP 2113