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