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