Old src/share/vm/runtime/thread.hpp (original) (raw)

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