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