1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP 26 #define SHARE_VM_RUNTIME_THREAD_HPP 27 28 #include "gc/shared/threadLocalAllocBuffer.hpp" 29 #include "memory/allocation.hpp" 30 #include "oops/oop.hpp" 31 #include "prims/jni.h" 32 #include "prims/jvmtiExport.hpp" 33 #include "runtime/frame.hpp" 34 #include "runtime/javaFrameAnchor.hpp" 35 #include "runtime/jniHandles.hpp" 36 #include "runtime/mutexLocker.hpp" 37 #include "runtime/os.hpp" 38 #include "runtime/osThread.hpp" 39 #include "runtime/park.hpp" 40 #include "runtime/safepoint.hpp" 41 #include "runtime/stubRoutines.hpp" 42 #include "runtime/threadLocalStorage.hpp" 43 #include "runtime/thread_ext.hpp" 44 #include "runtime/unhandledOops.hpp" 45 #include "trace/traceBackend.hpp" 46 #include "trace/traceMacros.hpp" 47 #include "utilities/exceptions.hpp" 48 #include "utilities/macros.hpp" 49 #include "utilities/top.hpp" 50 #if INCLUDE_ALL_GCS 51 #include "gc/g1/dirtyCardQueue.hpp" 52 #include "gc/g1/satbQueue.hpp" 53 #endif // INCLUDE_ALL_GCS 54 #ifdef TARGET_ARCH_zero 55 # include "stack_zero.hpp" 56 #endif 57 58 class ThreadSafepointState; 59 class ThreadProfiler; 60 61 class JvmtiThreadState; 62 class JvmtiGetLoadedClassesClosure; 63 class ThreadStatistics; 64 class ConcurrentLocksDump; 65 class ParkEvent; 66 class Parker; 67 68 class ciEnv; 69 class CompileThread; 70 class CompileLog; 71 class CompileTask; 72 class CompileQueue; 73 class CompilerCounters; 74 class vframeArray; 75 76 class DeoptResourceMark; 77 class jvmtiDeferredLocalVariableSet; 78 79 class GCTaskQueue; 80 class ThreadClosure; 81 class IdealGraphPrinter; 82 83 class Metadata; 84 template <class T, MEMFLAGS F> class ChunkedList; 85 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer; 86 87 DEBUG_ONLY(class ResourceMark;) 88 89 class WorkerThread; 90 91 // Class hierarchy 92 // - Thread 93 // - NamedThread 94 // - VMThread 95 // - ConcurrentGCThread 96 // - WorkerThread 97 // - GangWorker 98 // - GCTaskThread 99 // - JavaThread 100 // - WatcherThread 101 102 class Thread: public ThreadShadow { 103 friend class VMStructs; 104 private: 105 // Exception handling 106 // (Note: _pending_exception and friends are in ThreadShadow) 107 //oop _pending_exception; // pending exception for current thread 108 // const char* _exception_file; // file information for exception (debugging only) 109 // int _exception_line; // line information for exception (debugging only) 110 protected: 111 // Support for forcing alignment of thread objects for biased locking 112 void* _real_malloc_address; 113 public: 114 void* operator new(size_t size) throw() { return allocate(size, true); } 115 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 116 return allocate(size, false); } 117 void operator delete(void* p); 118 119 protected: 120 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 121 private: 122 123 // *************************************************************** 124 // Suspend and resume support 125 // *************************************************************** 126 // 127 // VM suspend/resume no longer exists - it was once used for various 128 // things including safepoints but was deprecated and finally removed 129 // in Java 7. Because VM suspension was considered "internal" Java-level 130 // suspension was considered "external", and this legacy naming scheme 131 // remains. 132 // 133 // External suspend/resume requests come from JVM_SuspendThread, 134 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI 135 // ResumeThread. External 136 // suspend requests cause _external_suspend to be set and external 137 // resume requests cause _external_suspend to be cleared. 138 // External suspend requests do not nest on top of other external 139 // suspend requests. The higher level APIs reject suspend requests 140 // for already suspended threads. 141 // 142 // The external_suspend 143 // flag is checked by has_special_runtime_exit_condition() and java thread 144 // will self-suspend when handle_special_runtime_exit_condition() is 145 // called. Most uses of the _thread_blocked state in JavaThreads are 146 // considered the same as being externally suspended; if the blocking 147 // condition lifts, the JavaThread will self-suspend. Other places 148 // where VM checks for external_suspend include: 149 // + mutex granting (do not enter monitors when thread is suspended) 150 // + state transitions from _thread_in_native 151 // 152 // In general, java_suspend() does not wait for an external suspend 153 // request to complete. When it returns, the only guarantee is that 154 // the _external_suspend field is true. 155 // 156 // wait_for_ext_suspend_completion() is used to wait for an external 157 // suspend request to complete. External suspend requests are usually 158 // followed by some other interface call that requires the thread to 159 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into 160 // the interface that requires quiescence, we give the JavaThread a 161 // chance to self-suspend before we need it to be quiescent. This 162 // improves overall suspend/query performance. 163 // 164 // _suspend_flags controls the behavior of java_ suspend/resume. 165 // It must be set under the protection of SR_lock. Read from the flag is 166 // OK without SR_lock as long as the value is only used as a hint. 167 // (e.g., check _external_suspend first without lock and then recheck 168 // inside SR_lock and finish the suspension) 169 // 170 // _suspend_flags is also overloaded for other "special conditions" so 171 // that a single check indicates whether any special action is needed 172 // eg. for async exceptions. 173 // ------------------------------------------------------------------- 174 // Notes: 175 // 1. The suspend/resume logic no longer uses ThreadState in OSThread 176 // but we still update its value to keep other part of the system (mainly 177 // JVMTI) happy. ThreadState is legacy code (see notes in 178 // osThread.hpp). 179 // 180 // 2. It would be more natural if set_external_suspend() is private and 181 // part of java_suspend(), but that probably would affect the suspend/query 182 // performance. Need more investigation on this. 183 184 // suspend/resume lock: used for self-suspend 185 Monitor* _SR_lock; 186 187 protected: 188 enum SuspendFlags { 189 // NOTE: avoid using the sign-bit as cc generates different test code 190 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 191 192 _external_suspend = 0x20000000U, // thread is asked to self suspend 193 _ext_suspended = 0x40000000U, // thread has self-suspended 194 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt 195 196 _has_async_exception = 0x00000001U, // there is a pending async exception 197 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock 198 }; 199 200 // various suspension related flags - atomically updated 201 // overloaded for async exception checking in check_special_condition_for_native_trans. 202 volatile uint32_t _suspend_flags; 203 204 private: 205 int _num_nested_signal; 206 207 DEBUG_ONLY(bool _suspendible_thread;) 208 209 public: 210 void enter_signal_handler() { _num_nested_signal++; } 211 void leave_signal_handler() { _num_nested_signal--; } 212 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } 213 214 #ifdef ASSERT 215 void set_suspendible_thread() { 216 _suspendible_thread = true; 217 } 218 219 void clear_suspendible_thread() { 220 _suspendible_thread = false; 221 } 222 223 bool is_suspendible_thread() { return _suspendible_thread; } 224 #endif 225 226 private: 227 // Active_handles points to a block of handles 228 JNIHandleBlock* _active_handles; 229 230 // One-element thread local free list 231 JNIHandleBlock* _free_handle_block; 232 233 // Point to the last handle mark 234 HandleMark* _last_handle_mark; 235 236 // The parity of the last strong_roots iteration in which this thread was 237 // claimed as a task. 238 jint _oops_do_parity; 239 240 public: 241 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 242 HandleMark* last_handle_mark() const { return _last_handle_mark; } 243 private: 244 245 // debug support for checking if code does allow safepoints or not 246 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on 247 // mutex, or blocking on an object synchronizer (Java locking). 248 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases 249 // If !allow_allocation(), then an assertion failure will happen during allocation 250 // (Hence, !allow_safepoint() => !allow_allocation()). 251 // 252 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. 253 // 254 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen 255 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. 256 257 // Used by SkipGCALot class. 258 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 259 260 friend class No_Alloc_Verifier; 261 friend class No_Safepoint_Verifier; 262 friend class Pause_No_Safepoint_Verifier; 263 friend class ThreadLocalStorage; 264 friend class GC_locker; 265 266 ThreadLocalAllocBuffer _tlab; // Thread-local eden 267 jlong _allocated_bytes; // Cumulative number of bytes allocated on 268 // the Java heap 269 270 TRACE_DATA _trace_data; // Thread-local data for tracing 271 272 ThreadExt _ext; 273 274 int _vm_operation_started_count; // VM_Operation support 275 int _vm_operation_completed_count; // VM_Operation support 276 277 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread 278 // is waiting to lock 279 bool _current_pending_monitor_is_from_java; // locking is from Java code 280 281 // ObjectMonitor on which this thread called Object.wait() 282 ObjectMonitor* _current_waiting_monitor; 283 284 // Private thread-local objectmonitor list - a simple cache organized as a SLL. 285 public: 286 ObjectMonitor* omFreeList; 287 int omFreeCount; // length of omFreeList 288 int omFreeProvision; // reload chunk size 289 ObjectMonitor* omInUseList; // SLL to track monitors in circulation 290 int omInUseCount; // length of omInUseList 291 292 #ifdef ASSERT 293 private: 294 bool _visited_for_critical_count; 295 296 public: 297 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } 298 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } 299 #endif 300 301 public: 302 enum { 303 is_definitely_current_thread = true 304 }; 305 306 // Constructor 307 Thread(); 308 virtual ~Thread(); 309 310 // initializtion 311 void initialize_thread_local_storage(); 312 313 // thread entry point 314 virtual void run(); 315 316 // Testers 317 virtual bool is_VM_thread() const { return false; } 318 virtual bool is_Java_thread() const { return false; } 319 virtual bool is_Compiler_thread() const { return false; } 320 virtual bool is_Code_cache_sweeper_thread() const { return false; } 321 virtual bool is_hidden_from_external_view() const { return false; } 322 virtual bool is_jvmti_agent_thread() const { return false; } 323 // True iff the thread can perform GC operations at a safepoint. 324 // Generally will be true only of VM thread and parallel GC WorkGang 325 // threads. 326 virtual bool is_GC_task_thread() const { return false; } 327 virtual bool is_Watcher_thread() const { return false; } 328 virtual bool is_ConcurrentGC_thread() const { return false; } 329 virtual bool is_Named_thread() const { return false; } 330 virtual bool is_Worker_thread() const { return false; } 331 332 // Can this thread make Java upcalls 333 virtual bool can_call_java() const { return false; } 334 335 // Casts 336 virtual WorkerThread* as_Worker_thread() const { return NULL; } 337 338 virtual char* name() const { return (char*)"Unknown thread"; } 339 340 // Returns the current thread 341 static inline Thread* current(); 342 // ... without having to include thread.inline.hpp. 343 static Thread* current_noinline(); 344 345 // Common thread operations 346 static void set_priority(Thread* thread, ThreadPriority priority); 347 static ThreadPriority get_priority(const Thread* const thread); 348 static void start(Thread* thread); 349 static void interrupt(Thread* thr); 350 static bool is_interrupted(Thread* thr, bool clear_interrupted); 351 352 void set_native_thread_name(const char *name) { 353 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); 354 os::set_native_thread_name(name); 355 } 356 357 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } 358 Monitor* SR_lock() const { return _SR_lock; } 359 360 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } 361 362 inline void set_suspend_flag(SuspendFlags f); 363 inline void clear_suspend_flag(SuspendFlags f); 364 365 inline void set_has_async_exception(); 366 inline void clear_has_async_exception(); 367 368 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } 369 370 inline void set_critical_native_unlock(); 371 inline void clear_critical_native_unlock(); 372 373 // Support for Unhandled Oop detection 374 // Add the field for both, fastdebug and debug, builds to keep 375 // Thread's fields layout the same. 376 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build. 377 #ifdef CHECK_UNHANDLED_OOPS 378 private: 379 UnhandledOops* _unhandled_oops; 380 #elif defined(ASSERT) 381 private: 382 void* _unhandled_oops; 383 #endif 384 #ifdef CHECK_UNHANDLED_OOPS 385 public: 386 UnhandledOops* unhandled_oops() { return _unhandled_oops; } 387 // Mark oop safe for gc. It may be stack allocated but won't move. 388 void allow_unhandled_oop(oop *op) { 389 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); 390 } 391 // Clear oops at safepoint so crashes point to unhandled oop violator 392 void clear_unhandled_oops() { 393 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); 394 } 395 #endif // CHECK_UNHANDLED_OOPS 396 397 public: 398 #ifndef PRODUCT 399 bool skip_gcalot() { return _skip_gcalot; } 400 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 401 #endif 402 403 // Installs a pending exception to be inserted later 404 static void send_async_exception(oop thread_oop, oop java_throwable); 405 406 // Resource area 407 ResourceArea* resource_area() const { return _resource_area; } 408 void set_resource_area(ResourceArea* area) { _resource_area = area; } 409 410 OSThread* osthread() const { return _osthread; } 411 void set_osthread(OSThread* thread) { _osthread = thread; } 412 413 // JNI handle support 414 JNIHandleBlock* active_handles() const { return _active_handles; } 415 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 416 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 417 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 418 419 // Internal handle support 420 HandleArea* handle_area() const { return _handle_area; } 421 void set_handle_area(HandleArea* area) { _handle_area = area; } 422 423 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 424 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 425 426 // Thread-Local Allocation Buffer (TLAB) support 427 ThreadLocalAllocBuffer& tlab() { return _tlab; } 428 void initialize_tlab() { 429 if (UseTLAB) { 430 tlab().initialize(); 431 } 432 } 433 434 jlong allocated_bytes() { return _allocated_bytes; } 435 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 436 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 437 inline jlong cooked_allocated_bytes(); 438 439 TRACE_DATA* trace_data() { return &_trace_data; } 440 441 const ThreadExt& ext() const { return _ext; } 442 ThreadExt& ext() { return _ext; } 443 444 // VM operation support 445 int vm_operation_ticket() { return ++_vm_operation_started_count; } 446 int vm_operation_completed_count() { return _vm_operation_completed_count; } 447 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } 448 449 // For tracking the heavyweight monitor the thread is pending on. 450 ObjectMonitor* current_pending_monitor() { 451 return _current_pending_monitor; 452 } 453 void set_current_pending_monitor(ObjectMonitor* monitor) { 454 _current_pending_monitor = monitor; 455 } 456 void set_current_pending_monitor_is_from_java(bool from_java) { 457 _current_pending_monitor_is_from_java = from_java; 458 } 459 bool current_pending_monitor_is_from_java() { 460 return _current_pending_monitor_is_from_java; 461 } 462 463 // For tracking the ObjectMonitor on which this thread called Object.wait() 464 ObjectMonitor* current_waiting_monitor() { 465 return _current_waiting_monitor; 466 } 467 void set_current_waiting_monitor(ObjectMonitor* monitor) { 468 _current_waiting_monitor = monitor; 469 } 470 471 // GC support 472 // Apply "f->do_oop" to all root oops in "this". 473 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive. 474 // Used by JavaThread::oops_do. 475 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 476 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 477 478 // Handles the parallel case for the method below. 479 private: 480 bool claim_oops_do_par_case(int collection_parity); 481 public: 482 // Requires that "collection_parity" is that of the current roots 483 // iteration. If "is_par" is false, sets the parity of "this" to 484 // "collection_parity", and returns "true". If "is_par" is true, 485 // uses an atomic instruction to set the current threads parity to 486 // "collection_parity", if it is not already. Returns "true" iff the 487 // calling thread does the update, this indicates that the calling thread 488 // has claimed the thread's stack as a root groop in the current 489 // collection. 490 bool claim_oops_do(bool is_par, int collection_parity) { 491 if (!is_par) { 492 _oops_do_parity = collection_parity; 493 return true; 494 } else { 495 return claim_oops_do_par_case(collection_parity); 496 } 497 } 498 499 // Sweeper support 500 void nmethods_do(CodeBlobClosure* cf); 501 502 // jvmtiRedefineClasses support 503 void metadata_handles_do(void f(Metadata*)); 504 505 // Used by fast lock support 506 virtual bool is_lock_owned(address adr) const; 507 508 // Check if address is in the stack of the thread (not just for locks). 509 // Warning: the method can only be used on the running thread 510 bool is_in_stack(address adr) const; 511 // Check if address is in the usable part of the stack (excludes protected 512 // guard pages) 513 bool is_in_usable_stack(address adr) const; 514 515 // Sets this thread as starting thread. Returns failure if thread 516 // creation fails due to lack of memory, too many threads etc. 517 bool set_as_starting_thread(); 518 519 protected: 520 // OS data associated with the thread 521 OSThread* _osthread; // Platform-specific thread information 522 523 // Thread local resource area for temporary allocation within the VM 524 ResourceArea* _resource_area; 525 526 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 527 528 // Thread local handle area for allocation of handles within the VM 529 HandleArea* _handle_area; 530 GrowableArray<Metadata*>* _metadata_handles; 531 532 // Support for stack overflow handling, get_thread, etc. 533 address _stack_base; 534 size_t _stack_size; 535 uintptr_t _self_raw_id; // used by get_thread (mutable) 536 int _lgrp_id; 537 538 public: 539 // Stack overflow support 540 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 541 542 void set_stack_base(address base) { _stack_base = base; } 543 size_t stack_size() const { return _stack_size; } 544 void set_stack_size(size_t size) { _stack_size = size; } 545 void record_stack_base_and_size(); 546 547 bool on_local_stack(address adr) const { 548 // QQQ this has knowledge of direction, ought to be a stack method 549 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); 550 } 551 552 uintptr_t self_raw_id() { return _self_raw_id; } 553 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } 554 555 int lgrp_id() const { return _lgrp_id; } 556 void set_lgrp_id(int value) { _lgrp_id = value; } 557 558 // Printing 559 virtual void print_on(outputStream* st) const; 560 void print() const { print_on(tty); } 561 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 562 563 // Debug-only code 564 #ifdef ASSERT 565 private: 566 // Deadlock detection support for Mutex locks. List of locks own by thread. 567 Monitor* _owned_locks; 568 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 569 // thus the friendship 570 friend class Mutex; 571 friend class Monitor; 572 573 public: 574 void print_owned_locks_on(outputStream* st) const; 575 void print_owned_locks() const { print_owned_locks_on(tty); } 576 Monitor* owned_locks() const { return _owned_locks; } 577 bool owns_locks() const { return owned_locks() != NULL; } 578 bool owns_locks_but_compiled_lock() const; 579 int oops_do_parity() const { return _oops_do_parity; } 580 581 // Deadlock detection 582 bool allow_allocation() { return _allow_allocation_count == 0; } 583 ResourceMark* current_resource_mark() { return _current_resource_mark; } 584 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 585 #endif 586 587 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; 588 589 private: 590 volatile int _jvmti_env_iteration_count; 591 592 public: 593 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 594 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 595 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 596 597 // Code generation 598 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); } 599 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); } 600 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); } 601 602 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); } 603 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); } 604 605 #define TLAB_FIELD_OFFSET(name) \ 606 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } 607 608 TLAB_FIELD_OFFSET(start) 609 TLAB_FIELD_OFFSET(end) 610 TLAB_FIELD_OFFSET(top) 611 TLAB_FIELD_OFFSET(pf_top) 612 TLAB_FIELD_OFFSET(size) // desired_size 613 TLAB_FIELD_OFFSET(refill_waste_limit) 614 TLAB_FIELD_OFFSET(number_of_refills) 615 TLAB_FIELD_OFFSET(fast_refill_waste) 616 TLAB_FIELD_OFFSET(slow_allocations) 617 618 #undef TLAB_FIELD_OFFSET 619 620 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); } 621 622 public: 623 volatile intptr_t _Stalled; 624 volatile int _TypeTag; 625 ParkEvent * _ParkEvent; // for synchronized() 626 ParkEvent * _SleepEvent; // for Thread.sleep 627 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor 628 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease 629 int NativeSyncRecursion; // diagnostic 630 631 volatile int _OnTrap; // Resume-at IP delta 632 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG 633 jint _hashStateX; // thread-specific hashCode generator state 634 jint _hashStateY; 635 jint _hashStateZ; 636 void * _schedctl; 637 638 639 volatile jint rng[4]; // RNG for spin loop 640 641 // Low-level leaf-lock primitives used to implement synchronization 642 // and native monitor-mutex infrastructure. 643 // Not for general synchronization use. 644 static void SpinAcquire(volatile int * Lock, const char * Name); 645 static void SpinRelease(volatile int * Lock); 646 static void muxAcquire(volatile intptr_t * Lock, const char * Name); 647 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev); 648 static void muxRelease(volatile intptr_t * Lock); 649 }; 650 651 // Inline implementation of Thread::current() 652 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of 653 // startup. 654 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same 655 // period. This is inlined in thread_<os_family>.inline.hpp. 656 657 inline Thread* Thread::current() { 658 #ifdef ASSERT 659 // This function is very high traffic. Define PARANOID to enable expensive 660 // asserts. 661 #ifdef PARANOID 662 // Signal handler should call ThreadLocalStorage::get_thread_slow() 663 Thread* t = ThreadLocalStorage::get_thread_slow(); 664 assert(t != NULL && !t->is_inside_signal_handler(), 665 "Don't use Thread::current() inside signal handler"); 666 #endif 667 #endif 668 Thread* thread = ThreadLocalStorage::thread(); 669 assert(thread != NULL, "just checking"); 670 return thread; 671 } 672 673 // Name support for threads. non-JavaThread subclasses with multiple 674 // uniquely named instances should derive from this. 675 class NamedThread: public Thread { 676 friend class VMStructs; 677 enum { 678 max_name_len = 64 679 }; 680 private: 681 char* _name; 682 // log JavaThread being processed by oops_do 683 JavaThread* _processed_thread; 684 685 public: 686 NamedThread(); 687 ~NamedThread(); 688 // May only be called once per thread. 689 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); 690 void initialize_named_thread(); 691 virtual bool is_Named_thread() const { return true; } 692 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } 693 JavaThread *processed_thread() { return _processed_thread; } 694 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } 695 virtual void print_on(outputStream* st) const; 696 }; 697 698 // Worker threads are named and have an id of an assigned work. 699 class WorkerThread: public NamedThread { 700 private: 701 uint _id; 702 public: 703 WorkerThread() : _id(0) { } 704 virtual bool is_Worker_thread() const { return true; } 705 706 virtual WorkerThread* as_Worker_thread() const { 707 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); 708 return (WorkerThread*) this; 709 } 710 711 void set_id(uint work_id) { _id = work_id; } 712 uint id() const { return _id; } 713 }; 714 715 // A single WatcherThread is used for simulating timer interrupts. 716 class WatcherThread: public Thread { 717 friend class VMStructs; 718 public: 719 virtual void run(); 720 721 private: 722 static WatcherThread* _watcher_thread; 723 724 static bool _startable; 725 // volatile due to at least one lock-free read 726 volatile static bool _should_terminate; 727 728 os::WatcherThreadCrashProtection* _crash_protection; 729 public: 730 enum SomeConstants { 731 delay_interval = 10 // interrupt delay in milliseconds 732 }; 733 734 // Constructor 735 WatcherThread(); 736 737 // Tester 738 bool is_Watcher_thread() const { return true; } 739 740 // Printing 741 char* name() const { return (char*)"VM Periodic Task Thread"; } 742 void print_on(outputStream* st) const; 743 void unpark(); 744 745 // Returns the single instance of WatcherThread 746 static WatcherThread* watcher_thread() { return _watcher_thread; } 747 748 // Create and start the single instance of WatcherThread, or stop it on shutdown 749 static void start(); 750 static void stop(); 751 // Only allow start once the VM is sufficiently initialized 752 // Otherwise the first task to enroll will trigger the start 753 static void make_startable(); 754 755 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) { 756 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread"); 757 _crash_protection = crash_protection; 758 } 759 760 bool has_crash_protection() const { return _crash_protection != NULL; } 761 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; } 762 763 private: 764 int sleep() const; 765 }; 766 767 768 class CompilerThread; 769 770 typedef void (*ThreadFunction)(JavaThread*, TRAPS); 771 772 class JavaThread: public Thread { 773 friend class VMStructs; 774 friend class WhiteBox; 775 private: 776 JavaThread* _next; // The next thread in the Threads list 777 oop _threadObj; // The Java level thread object 778 779 #ifdef ASSERT 780 private: 781 int _java_call_counter; 782 783 public: 784 int java_call_counter() { return _java_call_counter; } 785 void inc_java_call_counter() { _java_call_counter++; } 786 void dec_java_call_counter() { 787 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 788 _java_call_counter--; 789 } 790 private: // restore original namespace restriction 791 #endif // ifdef ASSERT 792 793 #ifndef PRODUCT 794 public: 795 enum { 796 jump_ring_buffer_size = 16 797 }; 798 private: // restore original namespace restriction 799 #endif 800 801 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 802 803 ThreadFunction _entry_point; 804 805 JNIEnv _jni_environment; 806 807 // Deopt support 808 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 809 810 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we 811 // transition out of native 812 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized 813 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 814 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 815 // Because deoptimization is lazy we must save jvmti requests to set locals 816 // in compiled frames until we deoptimize and we have an interpreter frame. 817 // This holds the pointer to array (yeah like there might be more than one) of 818 // description of compiled vframes that have locals that need to be updated. 819 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; 820 821 // Handshake value for fixing 6243940. We need a place for the i2c 822 // adapter to store the callee Method*. This value is NEVER live 823 // across a gc point so it does NOT have to be gc'd 824 // The handshake is open ended since we can't be certain that it will 825 // be NULLed. This is because we rarely ever see the race and end up 826 // in handle_wrong_method which is the backend of the handshake. See 827 // code in i2c adapters and handle_wrong_method. 828 829 Method* _callee_target; 830 831 // Used to pass back results to the interpreter or generated code running Java code. 832 oop _vm_result; // oop result is GC-preserved 833 Metadata* _vm_result_2; // non-oop result 834 835 // See ReduceInitialCardMarks: this holds the precise space interval of 836 // the most recent slow path allocation for which compiled code has 837 // elided card-marks for performance along the fast-path. 838 MemRegion _deferred_card_mark; 839 840 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 841 // allocated during deoptimization 842 // and by JNI_MonitorEnter/Exit 843 844 // Async. requests support 845 enum AsyncRequests { 846 _no_async_condition = 0, 847 _async_exception, 848 _async_unsafe_access_error 849 }; 850 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request 851 oop _pending_async_exception; 852 853 // Safepoint support 854 public: // Expose _thread_state for SafeFetchInt() 855 volatile JavaThreadState _thread_state; 856 private: 857 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint 858 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 859 860 // JavaThread termination support 861 enum TerminatedTypes { 862 _not_terminated = 0xDEAD - 2, 863 _thread_exiting, // JavaThread::exit() has been called for this thread 864 _thread_terminated, // JavaThread is removed from thread list 865 _vm_exited // JavaThread is still executing native code, but VM is terminated 866 // only VM_Exit can set _vm_exited 867 }; 868 869 // In general a JavaThread's _terminated field transitions as follows: 870 // 871 // _not_terminated => _thread_exiting => _thread_terminated 872 // 873 // _vm_exited is a special value to cover the case of a JavaThread 874 // executing native code after the VM itself is terminated. 875 volatile TerminatedTypes _terminated; 876 // suspend/resume support 877 volatile bool _suspend_equivalent; // Suspend equivalent condition 878 jint _in_deopt_handler; // count of deoptimization 879 // handlers thread is in 880 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 881 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 882 // never locked) when throwing an exception. Used by interpreter only. 883 884 // JNI attach states: 885 enum JNIAttachStates { 886 _not_attaching_via_jni = 1, // thread is not attaching via JNI 887 _attaching_via_jni, // thread is attaching via JNI 888 _attached_via_jni // thread has attached via JNI 889 }; 890 891 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 892 // A native thread that is attaching via JNI starts with a value 893 // of _attaching_via_jni and transitions to _attached_via_jni. 894 volatile JNIAttachStates _jni_attach_state; 895 896 public: 897 // State of the stack guard pages for this thread. 898 enum StackGuardState { 899 stack_guard_unused, // not needed 900 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow 901 stack_guard_enabled // enabled 902 }; 903 904 private: 905 906 #if INCLUDE_JVMCI 907 // The _pending_* fields below are used to communicate extra information 908 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. 909 910 // Communicates the DeoptReason and DeoptAction of the uncommon trap 911 int _pending_deoptimization; 912 913 // Specifies whether the uncommon trap is to bci 0 of a synchronized method 914 // before the monitor has been acquired. 915 bool _pending_monitorenter; 916 917 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter 918 bool _pending_transfer_to_interpreter; 919 920 // An object that JVMCI compiled code can use to further describe and 921 // uniquely identify the speculative optimization guarded by the uncommon trap 922 oop _pending_failed_speculation; 923 924 // These fields are mutually exclusive in terms of live ranges. 925 union { 926 // Communicates the pc at which the most recent implicit exception occurred 927 // from the signal handler to a deoptimization stub. 928 address _implicit_exception_pc; 929 930 // Communicates an alternative call target to an i2c stub from a JavaCall . 931 address _alternate_call_target; 932 } _jvmci; 933 934 // Support for high precision, thread sensitive counters in JVMCI compiled code. 935 jlong* _jvmci_counters; 936 937 public: 938 static jlong* _jvmci_old_thread_counters; 939 static void collect_counters(typeArrayOop array); 940 private: 941 #endif // INCLUDE_JVMCI 942 943 StackGuardState _stack_guard_state; 944 945 // Precompute the limit of the stack as used in stack overflow checks. 946 // We load it from here to simplify the stack overflow check in assembly. 947 address _stack_overflow_limit; 948 949 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 950 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 951 // code) 952 volatile oop _exception_oop; // Exception thrown in compiled code 953 volatile address _exception_pc; // PC where exception happened 954 volatile address _exception_handler_pc; // PC for handler of exception 955 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 956 957 private: 958 // support for JNI critical regions 959 jint _jni_active_critical; // count of entries into JNI critical region 960 961 // Checked JNI: function name requires exception check 962 char* _pending_jni_exception_check_fn; 963 964 // For deadlock detection. 965 int _depth_first_number; 966 967 // JVMTI PopFrame support 968 // This is set to popframe_pending to signal that top Java frame should be popped immediately 969 int _popframe_condition; 970 971 // If reallocation of scalar replaced objects fails, we throw OOM 972 // and during exception propagation, pop the top 973 // _frames_to_pop_failed_realloc frames, the ones that reference 974 // failed reallocations. 975 int _frames_to_pop_failed_realloc; 976 977 #ifndef PRODUCT 978 int _jmp_ring_index; 979 struct { 980 // We use intptr_t instead of address so debugger doesn't try and display strings 981 intptr_t _target; 982 intptr_t _instruction; 983 const char* _file; 984 int _line; 985 } _jmp_ring[jump_ring_buffer_size]; 986 #endif // PRODUCT 987 988 #if INCLUDE_ALL_GCS 989 // Support for G1 barriers 990 991 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. 992 // Set of all such queues. 993 static SATBMarkQueueSet _satb_mark_queue_set; 994 995 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. 996 // Set of all such queues. 997 static DirtyCardQueueSet _dirty_card_queue_set; 998 999 void flush_barrier_queues(); 1000 #endif // INCLUDE_ALL_GCS 1001 1002 friend class VMThread; 1003 friend class ThreadWaitTransition; 1004 friend class VM_Exit; 1005 1006 void initialize(); // Initialized the instance variables 1007 1008 public: 1009 // Constructor 1010 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads 1011 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 1012 ~JavaThread(); 1013 1014 #ifdef ASSERT 1015 // verify this JavaThread hasn't be published in the Threads::list yet 1016 void verify_not_published(); 1017 #endif 1018 1019 //JNI functiontable getter/setter for JVMTI jni function table interception API. 1020 void set_jni_functions(struct JNINativeInterface_* functionTable) { 1021 _jni_environment.functions = functionTable; 1022 } 1023 struct JNINativeInterface_* get_jni_functions() { 1024 return (struct JNINativeInterface_ *)_jni_environment.functions; 1025 } 1026 1027 // This function is called at thread creation to allow 1028 // platform specific thread variables to be initialized. 1029 void cache_global_variables(); 1030 1031 // Executes Shutdown.shutdown() 1032 void invoke_shutdown_hooks(); 1033 1034 // Cleanup on thread exit 1035 enum ExitType { 1036 normal_exit, 1037 jni_detach 1038 }; 1039 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 1040 1041 void cleanup_failed_attach_current_thread(); 1042 1043 // Testers 1044 virtual bool is_Java_thread() const { return true; } 1045 virtual bool can_call_java() const { return true; } 1046 1047 // Thread chain operations 1048 JavaThread* next() const { return _next; } 1049 void set_next(JavaThread* p) { _next = p; } 1050 1051 // Thread oop. threadObj() can be NULL for initial JavaThread 1052 // (or for threads attached via JNI) 1053 oop threadObj() const { return _threadObj; } 1054 void set_threadObj(oop p) { _threadObj = p; } 1055 1056 ThreadPriority java_priority() const; // Read from threadObj() 1057 1058 // Prepare thread and add to priority queue. If a priority is 1059 // not specified, use the priority of the thread object. Threads_lock 1060 // must be held while this function is called. 1061 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 1062 void prepare_ext(); 1063 1064 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 1065 address saved_exception_pc() { return _saved_exception_pc; } 1066 1067 1068 ThreadFunction entry_point() const { return _entry_point; } 1069 1070 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1071 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS); 1072 1073 // Last frame anchor routines 1074 1075 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1076 1077 // last_Java_sp 1078 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1079 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1080 1081 // last_Java_pc 1082 1083 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1084 1085 // Safepoint support 1086 #if !(defined(PPC64) || defined(AARCH64)) 1087 JavaThreadState thread_state() const { return _thread_state; } 1088 void set_thread_state(JavaThreadState s) { _thread_state = s; } 1089 #else 1090 // Use membars when accessing volatile _thread_state. See 1091 // Threads::create_vm() for size checks. 1092 inline JavaThreadState thread_state() const; 1093 inline void set_thread_state(JavaThreadState s); 1094 #endif 1095 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } 1096 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } 1097 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } 1098 1099 // thread has called JavaThread::exit() or is terminated 1100 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } 1101 // thread is terminated (no longer on the threads list); we compare 1102 // against the two non-terminated values so that a freed JavaThread 1103 // will also be considered terminated. 1104 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } 1105 void set_terminated(TerminatedTypes t) { _terminated = t; } 1106 // special for Threads::remove() which is static: 1107 void set_terminated_value() { _terminated = _thread_terminated; } 1108 void block_if_vm_exited(); 1109 1110 bool doing_unsafe_access() { return _doing_unsafe_access; } 1111 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1112 1113 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1114 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1115 1116 // Suspend/resume support for JavaThread 1117 private: 1118 inline void set_ext_suspended(); 1119 inline void clear_ext_suspended(); 1120 1121 public: 1122 void java_suspend(); 1123 void java_resume(); 1124 int java_suspend_self(); 1125 1126 void check_and_wait_while_suspended() { 1127 assert(JavaThread::current() == this, "sanity check"); 1128 1129 bool do_self_suspend; 1130 do { 1131 // were we externally suspended while we were waiting? 1132 do_self_suspend = handle_special_suspend_equivalent_condition(); 1133 if (do_self_suspend) { 1134 // don't surprise the thread that suspended us by returning 1135 java_suspend_self(); 1136 set_suspend_equivalent(); 1137 } 1138 } while (do_self_suspend); 1139 } 1140 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); 1141 // Check for async exception in addition to safepoint and suspend request. 1142 static void check_special_condition_for_native_trans(JavaThread *thread); 1143 1144 // Same as check_special_condition_for_native_trans but finishes the 1145 // transition into thread_in_Java mode so that it can potentially 1146 // block. 1147 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); 1148 1149 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); 1150 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { 1151 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1152 // Warning: is_ext_suspend_completed() may temporarily drop the 1153 // SR_lock to allow the thread to reach a stable thread state if 1154 // it is currently in a transient thread state. 1155 return is_ext_suspend_completed(false /* !called_by_wait */, 1156 SuspendRetryDelay, bits); 1157 } 1158 1159 // We cannot allow wait_for_ext_suspend_completion() to run forever or 1160 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally 1161 // passed as the count and delay parameters. Experiments with specific 1162 // calls to wait_for_ext_suspend_completion() can be done by passing 1163 // other values in the code. Experiments with all calls can be done 1164 // via the appropriate -XX options. 1165 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); 1166 1167 inline void set_external_suspend(); 1168 inline void clear_external_suspend(); 1169 1170 inline void set_deopt_suspend(); 1171 inline void clear_deopt_suspend(); 1172 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } 1173 1174 bool is_external_suspend() const { 1175 return (_suspend_flags & _external_suspend) != 0; 1176 } 1177 // Whenever a thread transitions from native to vm/java it must suspend 1178 // if external|deopt suspend is present. 1179 bool is_suspend_after_native() const { 1180 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0; 1181 } 1182 1183 // external suspend request is completed 1184 bool is_ext_suspended() const { 1185 return (_suspend_flags & _ext_suspended) != 0; 1186 } 1187 1188 bool is_external_suspend_with_lock() const { 1189 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1190 return is_external_suspend(); 1191 } 1192 1193 // Special method to handle a pending external suspend request 1194 // when a suspend equivalent condition lifts. 1195 bool handle_special_suspend_equivalent_condition() { 1196 assert(is_suspend_equivalent(), 1197 "should only be called in a suspend equivalence condition"); 1198 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1199 bool ret = is_external_suspend(); 1200 if (!ret) { 1201 // not about to self-suspend so clear suspend equivalence 1202 clear_suspend_equivalent(); 1203 } 1204 // implied else: 1205 // We have a pending external suspend request so we leave the 1206 // suspend_equivalent flag set until java_suspend_self() sets 1207 // the ext_suspended flag and clears the suspend_equivalent 1208 // flag. This insures that wait_for_ext_suspend_completion() 1209 // will return consistent values. 1210 return ret; 1211 } 1212 1213 // utility methods to see if we are doing some kind of suspension 1214 bool is_being_ext_suspended() const { 1215 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1216 return is_ext_suspended() || is_external_suspend(); 1217 } 1218 1219 bool is_suspend_equivalent() const { return _suspend_equivalent; } 1220 1221 void set_suspend_equivalent() { _suspend_equivalent = true; } 1222 void clear_suspend_equivalent() { _suspend_equivalent = false; } 1223 1224 // Thread.stop support 1225 void send_thread_stop(oop throwable); 1226 AsyncRequests clear_special_runtime_exit_condition() { 1227 AsyncRequests x = _special_runtime_exit_condition; 1228 _special_runtime_exit_condition = _no_async_condition; 1229 return x; 1230 } 1231 1232 // Are any async conditions present? 1233 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } 1234 1235 void check_and_handle_async_exceptions(bool check_unsafe_error = true); 1236 1237 // these next two are also used for self-suspension and async exception support 1238 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1239 1240 // Return true if JavaThread has an asynchronous condition or 1241 // if external suspension is requested. 1242 bool has_special_runtime_exit_condition() { 1243 // We call is_external_suspend() last since external suspend should 1244 // be less common. Because we don't use is_external_suspend_with_lock 1245 // it is possible that we won't see an asynchronous external suspend 1246 // request that has just gotten started, i.e., SR_lock grabbed but 1247 // _external_suspend field change either not made yet or not visible 1248 // yet. However, this is okay because the request is asynchronous and 1249 // we will see the new flag value the next time through. It's also 1250 // possible that the external suspend request is dropped after 1251 // we have checked is_external_suspend(), we will recheck its value 1252 // under SR_lock in java_suspend_self(). 1253 return (_special_runtime_exit_condition != _no_async_condition) || 1254 is_external_suspend() || is_deopt_suspend(); 1255 } 1256 1257 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } 1258 1259 inline void set_pending_async_exception(oop e); 1260 1261 // Fast-locking support 1262 bool is_lock_owned(address adr) const; 1263 1264 // Accessors for vframe array top 1265 // The linked list of vframe arrays are sorted on sp. This means when we 1266 // unpack the head must contain the vframe array to unpack. 1267 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1268 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1269 1270 // Side structure for deferring update of java frame locals until deopt occurs 1271 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } 1272 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } 1273 1274 // These only really exist to make debugging deopt problems simpler 1275 1276 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1277 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1278 1279 // The special resourceMark used during deoptimization 1280 1281 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1282 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1283 1284 intptr_t* must_deopt_id() { return _must_deopt_id; } 1285 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } 1286 void clear_must_deopt_id() { _must_deopt_id = NULL; } 1287 1288 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } 1289 nmethod* deopt_nmethod() { return _deopt_nmethod; } 1290 1291 Method* callee_target() const { return _callee_target; } 1292 void set_callee_target (Method* x) { _callee_target = x; } 1293 1294 // Oop results of vm runtime calls 1295 oop vm_result() const { return _vm_result; } 1296 void set_vm_result (oop x) { _vm_result = x; } 1297 1298 Metadata* vm_result_2() const { return _vm_result_2; } 1299 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1300 1301 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1302 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1303 1304 #if INCLUDE_JVMCI 1305 int pending_deoptimization() const { return _pending_deoptimization; } 1306 oop pending_failed_speculation() const { return _pending_failed_speculation; } 1307 bool has_pending_monitorenter() const { return _pending_monitorenter; } 1308 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } 1309 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } 1310 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; } 1311 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } 1312 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; } 1313 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; } 1314 #endif // INCLUDE_JVMCI 1315 1316 // Exception handling for compiled methods 1317 oop exception_oop() const { return _exception_oop; } 1318 address exception_pc() const { return _exception_pc; } 1319 address exception_handler_pc() const { return _exception_handler_pc; } 1320 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1321 1322 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); } 1323 void set_exception_pc(address a) { _exception_pc = a; } 1324 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1325 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1326 1327 void clear_exception_oop_and_pc() { 1328 set_exception_oop(NULL); 1329 set_exception_pc(NULL); 1330 } 1331 1332 // Stack overflow support 1333 inline size_t stack_available(address cur_sp); 1334 address stack_yellow_zone_base() { 1335 return (address)(stack_base() - 1336 (stack_size() - 1337 (stack_red_zone_size() + stack_yellow_zone_size()))); 1338 } 1339 size_t stack_yellow_zone_size() { 1340 return StackYellowPages * os::vm_page_size(); 1341 } 1342 address stack_red_zone_base() { 1343 return (address)(stack_base() - (stack_size() - stack_red_zone_size())); 1344 } 1345 size_t stack_red_zone_size() { return StackRedPages * os::vm_page_size(); } 1346 bool in_stack_yellow_zone(address a) { 1347 return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); 1348 } 1349 bool in_stack_red_zone(address a) { 1350 return (a <= stack_red_zone_base()) && 1351 (a >= (address)((intptr_t)stack_base() - stack_size())); 1352 } 1353 1354 void create_stack_guard_pages(); 1355 void remove_stack_guard_pages(); 1356 1357 void enable_stack_yellow_zone(); 1358 void disable_stack_yellow_zone(); 1359 void enable_stack_red_zone(); 1360 void disable_stack_red_zone(); 1361 1362 inline bool stack_guard_zone_unused(); 1363 inline bool stack_yellow_zone_disabled(); 1364 inline bool stack_yellow_zone_enabled(); 1365 1366 // Attempt to reguard the stack after a stack overflow may have occurred. 1367 // Returns true if (a) guard pages are not needed on this thread, (b) the 1368 // pages are already guarded, or (c) the pages were successfully reguarded. 1369 // Returns false if there is not enough stack space to reguard the pages, in 1370 // which case the caller should unwind a frame and try again. The argument 1371 // should be the caller's (approximate) sp. 1372 bool reguard_stack(address cur_sp); 1373 // Similar to above but see if current stackpoint is out of the guard area 1374 // and reguard if possible. 1375 bool reguard_stack(void); 1376 1377 address stack_overflow_limit() { return _stack_overflow_limit; } 1378 void set_stack_overflow_limit() { 1379 _stack_overflow_limit = _stack_base - _stack_size + 1380 ((StackShadowPages + 1381 StackYellowPages + 1382 StackRedPages) * os::vm_page_size()); 1383 } 1384 1385 // Misc. accessors/mutators 1386 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1387 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1388 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1389 1390 #ifndef PRODUCT 1391 void record_jump(address target, address instr, const char* file, int line); 1392 #endif // PRODUCT 1393 1394 // For assembly stub generation 1395 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } 1396 #ifndef PRODUCT 1397 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); } 1398 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); } 1399 #endif // PRODUCT 1400 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } 1401 static ByteSize last_Java_sp_offset() { 1402 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1403 } 1404 static ByteSize last_Java_pc_offset() { 1405 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1406 } 1407 static ByteSize frame_anchor_offset() { 1408 return byte_offset_of(JavaThread, _anchor); 1409 } 1410 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } 1411 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } 1412 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } 1413 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } 1414 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } 1415 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } 1416 #if INCLUDE_JVMCI 1417 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); } 1418 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); } 1419 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); } 1420 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); } 1421 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); } 1422 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); } 1423 #endif // INCLUDE_JVMCI 1424 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } 1425 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } 1426 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1427 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } 1428 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1429 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); } 1430 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } 1431 1432 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1433 static ByteSize should_post_on_exceptions_flag_offset() { 1434 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1435 } 1436 1437 #if INCLUDE_ALL_GCS 1438 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } 1439 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } 1440 #endif // INCLUDE_ALL_GCS 1441 1442 // Returns the jni environment for this thread 1443 JNIEnv* jni_environment() { return &_jni_environment; } 1444 1445 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1446 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1447 // Only return NULL if thread is off the thread list; starting to 1448 // exit should not return NULL. 1449 if (thread_from_jni_env->is_terminated()) { 1450 thread_from_jni_env->block_if_vm_exited(); 1451 return NULL; 1452 } else { 1453 return thread_from_jni_env; 1454 } 1455 } 1456 1457 // JNI critical regions. These can nest. 1458 bool in_critical() { return _jni_active_critical > 0; } 1459 bool in_last_critical() { return _jni_active_critical == 1; } 1460 void enter_critical() { 1461 assert(Thread::current() == this || 1462 (Thread::current()->is_VM_thread() && 1463 SafepointSynchronize::is_synchronizing()), 1464 "this must be current thread or synchronizing"); 1465 _jni_active_critical++; 1466 } 1467 void exit_critical() { 1468 assert(Thread::current() == this, "this must be current thread"); 1469 _jni_active_critical--; 1470 assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); 1471 } 1472 1473 // Checked JNI, is the programmer required to check for exceptions, specify which function name 1474 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1475 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1476 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1477 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1478 1479 // For deadlock detection 1480 int depth_first_number() { return _depth_first_number; } 1481 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1482 1483 private: 1484 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1485 1486 public: 1487 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1488 void add_monitor_chunk(MonitorChunk* chunk); 1489 void remove_monitor_chunk(MonitorChunk* chunk); 1490 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1491 void inc_in_deopt_handler() { _in_deopt_handler++; } 1492 void dec_in_deopt_handler() { 1493 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1494 if (_in_deopt_handler > 0) { // robustness 1495 _in_deopt_handler--; 1496 } 1497 } 1498 1499 private: 1500 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1501 1502 public: 1503 1504 // Frame iteration; calls the function f for all frames on the stack 1505 void frames_do(void f(frame*, const RegisterMap*)); 1506 1507 // Memory operations 1508 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1509 1510 // Sweeper operations 1511 void nmethods_do(CodeBlobClosure* cf); 1512 1513 // RedefineClasses Support 1514 void metadata_do(void f(Metadata*)); 1515 1516 // Misc. operations 1517 char* name() const { return (char*)get_thread_name(); } 1518 void print_on(outputStream* st) const; 1519 void print_value(); 1520 void print_thread_state_on(outputStream*) const PRODUCT_RETURN; 1521 void print_thread_state() const PRODUCT_RETURN; 1522 void print_on_error(outputStream* st, char* buf, int buflen) const; 1523 void verify(); 1524 const char* get_thread_name() const; 1525 private: 1526 // factor out low-level mechanics for use in both normal and error cases 1527 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1528 public: 1529 const char* get_threadgroup_name() const; 1530 const char* get_parent_name() const; 1531 1532 // Accessing frames 1533 frame last_frame() { 1534 _anchor.make_walkable(this); 1535 return pd_last_frame(); 1536 } 1537 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1538 1539 // Returns method at 'depth' java or native frames down the stack 1540 // Used for security checks 1541 Klass* security_get_caller_class(int depth); 1542 1543 // Print stack trace in external format 1544 void print_stack_on(outputStream* st); 1545 void print_stack() { print_stack_on(tty); } 1546 1547 // Print stack traces in various internal formats 1548 void trace_stack() PRODUCT_RETURN; 1549 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1550 void trace_frames() PRODUCT_RETURN; 1551 void trace_oops() PRODUCT_RETURN; 1552 1553 // Print an annotated view of the stack frames 1554 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1555 void validate_frame_layout() { 1556 print_frame_layout(0, true); 1557 } 1558 1559 // Returns the number of stack frames on the stack 1560 int depth() const; 1561 1562 // Function for testing deoptimization 1563 void deoptimize(); 1564 void make_zombies(); 1565 1566 void deoptimized_wrt_marked_nmethods(); 1567 1568 // Profiling operation (see fprofile.cpp) 1569 public: 1570 bool profile_last_Java_frame(frame* fr); 1571 1572 private: 1573 ThreadProfiler* _thread_profiler; 1574 private: 1575 friend class FlatProfiler; // uses both [gs]et_thread_profiler. 1576 friend class FlatProfilerTask; // uses get_thread_profiler. 1577 friend class ThreadProfilerMark; // uses get_thread_profiler. 1578 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } 1579 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { 1580 ThreadProfiler* result = _thread_profiler; 1581 _thread_profiler = tp; 1582 return result; 1583 } 1584 1585 public: 1586 // Returns the running thread as a JavaThread 1587 static inline JavaThread* current(); 1588 1589 // Returns the active Java thread. Do not use this if you know you are calling 1590 // from a JavaThread, as it's slower than JavaThread::current. If called from 1591 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1592 // operation. You may not want that either. 1593 static JavaThread* active(); 1594 1595 inline CompilerThread* as_CompilerThread(); 1596 1597 public: 1598 virtual void run(); 1599 void thread_main_inner(); 1600 1601 private: 1602 // PRIVILEGED STACK 1603 PrivilegedElement* _privileged_stack_top; 1604 GrowableArray<oop>* _array_for_gc; 1605 public: 1606 1607 // Returns the privileged_stack information. 1608 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } 1609 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } 1610 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } 1611 1612 public: 1613 // Thread local information maintained by JVMTI. 1614 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1615 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1616 // getter is used to get this JavaThread's JvmtiThreadState if it has 1617 // one which means NULL can be returned. JvmtiThreadState::state_for() 1618 // is used to get the specified JavaThread's JvmtiThreadState if it has 1619 // one or it allocates a new JvmtiThreadState for the JavaThread and 1620 // returns it. JvmtiThreadState::state_for() will return NULL only if 1621 // the specified JavaThread is exiting. 1622 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1623 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1624 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } 1625 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } 1626 1627 // JVMTI PopFrame support 1628 // Setting and clearing popframe_condition 1629 // All of these enumerated values are bits. popframe_pending 1630 // indicates that a PopFrame() has been requested and not yet been 1631 // completed. popframe_processing indicates that that PopFrame() is in 1632 // the process of being completed. popframe_force_deopt_reexecution_bit 1633 // indicates that special handling is required when returning to a 1634 // deoptimized caller. 1635 enum PopCondition { 1636 popframe_inactive = 0x00, 1637 popframe_pending_bit = 0x01, 1638 popframe_processing_bit = 0x02, 1639 popframe_force_deopt_reexecution_bit = 0x04 1640 }; 1641 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1642 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1643 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1644 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1645 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1646 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1647 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1648 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1649 #ifdef CC_INTERP 1650 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } 1651 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } 1652 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1653 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1654 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1655 #endif 1656 1657 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1658 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1659 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1660 1661 private: 1662 // Saved incoming arguments to popped frame. 1663 // Used only when popped interpreted frame returns to deoptimized frame. 1664 void* _popframe_preserved_args; 1665 int _popframe_preserved_args_size; 1666 1667 public: 1668 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1669 void* popframe_preserved_args(); 1670 ByteSize popframe_preserved_args_size(); 1671 WordSize popframe_preserved_args_size_in_words(); 1672 void popframe_free_preserved_args(); 1673 1674 1675 private: 1676 JvmtiThreadState *_jvmti_thread_state; 1677 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; 1678 1679 // Used by the interpreter in fullspeed mode for frame pop, method 1680 // entry, method exit and single stepping support. This field is 1681 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. 1682 // It can be set to zero asynchronously (i.e., without a VM operation 1683 // or a lock) so we have to be very careful. 1684 int _interp_only_mode; 1685 1686 public: 1687 // used by the interpreter for fullspeed debugging support (see above) 1688 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1689 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1690 int get_interp_only_mode() { return _interp_only_mode; } 1691 void increment_interp_only_mode() { ++_interp_only_mode; } 1692 void decrement_interp_only_mode() { --_interp_only_mode; } 1693 1694 // support for cached flag that indicates whether exceptions need to be posted for this thread 1695 // if this is false, we can avoid deoptimizing when events are thrown 1696 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1697 private: 1698 int _should_post_on_exceptions_flag; 1699 1700 public: 1701 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1702 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1703 1704 private: 1705 ThreadStatistics *_thread_stat; 1706 1707 public: 1708 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1709 1710 // Return a blocker object for which this thread is blocked parking. 1711 oop current_park_blocker(); 1712 1713 private: 1714 static size_t _stack_size_at_create; 1715 1716 public: 1717 static inline size_t stack_size_at_create(void) { 1718 return _stack_size_at_create; 1719 } 1720 static inline void set_stack_size_at_create(size_t value) { 1721 _stack_size_at_create = value; 1722 } 1723 1724 #if INCLUDE_ALL_GCS 1725 // SATB marking queue support 1726 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } 1727 static SATBMarkQueueSet& satb_mark_queue_set() { 1728 return _satb_mark_queue_set; 1729 } 1730 1731 // Dirty card queue support 1732 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } 1733 static DirtyCardQueueSet& dirty_card_queue_set() { 1734 return _dirty_card_queue_set; 1735 } 1736 #endif // INCLUDE_ALL_GCS 1737 1738 // This method initializes the SATB and dirty card queues before a 1739 // JavaThread is added to the Java thread list. Right now, we don't 1740 // have to do anything to the dirty card queue (it should have been 1741 // activated when the thread was created), but we have to activate 1742 // the SATB queue if the thread is created while a marking cycle is 1743 // in progress. The activation / de-activation of the SATB queues at 1744 // the beginning / end of a marking cycle is done during safepoints 1745 // so we have to make sure this method is called outside one to be 1746 // able to safely read the active field of the SATB queue set. Right 1747 // now, it is called just before the thread is added to the Java 1748 // thread list in the Threads::add() method. That method is holding 1749 // the Threads_lock which ensures we are outside a safepoint. We 1750 // cannot do the obvious and set the active field of the SATB queue 1751 // when the thread is created given that, in some cases, safepoints 1752 // might happen between the JavaThread constructor being called and the 1753 // thread being added to the Java thread list (an example of this is 1754 // when the structure for the DestroyJavaVM thread is created). 1755 #if INCLUDE_ALL_GCS 1756 void initialize_queues(); 1757 #else // INCLUDE_ALL_GCS 1758 void initialize_queues() { } 1759 #endif // INCLUDE_ALL_GCS 1760 1761 // Machine dependent stuff 1762 #ifdef TARGET_OS_ARCH_linux_x86 1763 # include "thread_linux_x86.hpp" 1764 #endif 1765 #ifdef TARGET_OS_ARCH_linux_sparc 1766 # include "thread_linux_sparc.hpp" 1767 #endif 1768 #ifdef TARGET_OS_ARCH_linux_zero 1769 # include "thread_linux_zero.hpp" 1770 #endif 1771 #ifdef TARGET_OS_ARCH_solaris_x86 1772 # include "thread_solaris_x86.hpp" 1773 #endif 1774 #ifdef TARGET_OS_ARCH_solaris_sparc 1775 # include "thread_solaris_sparc.hpp" 1776 #endif 1777 #ifdef TARGET_OS_ARCH_windows_x86 1778 # include "thread_windows_x86.hpp" 1779 #endif 1780 #ifdef TARGET_OS_ARCH_linux_arm 1781 # include "thread_linux_arm.hpp" 1782 #endif 1783 #ifdef TARGET_OS_ARCH_linux_ppc 1784 # include "thread_linux_ppc.hpp" 1785 #endif 1786 #ifdef TARGET_OS_ARCH_linux_aarch64 1787 # include "thread_linux_aarch64.hpp" 1788 #endif 1789 #ifdef TARGET_OS_ARCH_aix_ppc 1790 # include "thread_aix_ppc.hpp" 1791 #endif 1792 #ifdef TARGET_OS_ARCH_bsd_x86 1793 # include "thread_bsd_x86.hpp" 1794 #endif 1795 #ifdef TARGET_OS_ARCH_bsd_zero 1796 # include "thread_bsd_zero.hpp" 1797 #endif 1798 1799 1800 public: 1801 void set_blocked_on_compilation(bool value) { 1802 _blocked_on_compilation = value; 1803 } 1804 1805 bool blocked_on_compilation() { 1806 return _blocked_on_compilation; 1807 } 1808 protected: 1809 bool _blocked_on_compilation; 1810 1811 1812 // JSR166 per-thread parker 1813 private: 1814 Parker* _parker; 1815 public: 1816 Parker* parker() { return _parker; } 1817 1818 // Biased locking support 1819 private: 1820 GrowableArray<MonitorInfo*>* _cached_monitor_info; 1821 public: 1822 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 1823 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 1824 1825 // clearing/querying jni attach status 1826 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1827 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1828 inline void set_done_attaching_via_jni(); 1829 private: 1830 // This field is used to determine if a thread has claimed 1831 // a par_id: it is UINT_MAX if the thread has not claimed a par_id; 1832 // otherwise its value is the par_id that has been claimed. 1833 uint _claimed_par_id; 1834 public: 1835 uint get_claimed_par_id() { return _claimed_par_id; } 1836 void set_claimed_par_id(uint id) { _claimed_par_id = id; } 1837 }; 1838 1839 // Inline implementation of JavaThread::current 1840 inline JavaThread* JavaThread::current() { 1841 Thread* thread = ThreadLocalStorage::thread(); 1842 assert(thread != NULL && thread->is_Java_thread(), "just checking"); 1843 return (JavaThread*)thread; 1844 } 1845 1846 inline CompilerThread* JavaThread::as_CompilerThread() { 1847 assert(is_Compiler_thread(), "just checking"); 1848 return (CompilerThread*)this; 1849 } 1850 1851 // Dedicated thread to sweep the code cache 1852 class CodeCacheSweeperThread : public JavaThread { 1853 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper 1854 public: 1855 CodeCacheSweeperThread(); 1856 // Track the nmethod currently being scanned by the sweeper 1857 void set_scanned_nmethod(nmethod* nm) { 1858 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value"); 1859 _scanned_nmethod = nm; 1860 } 1861 1862 // Hide sweeper thread from external view. 1863 bool is_hidden_from_external_view() const { return true; } 1864 1865 bool is_Code_cache_sweeper_thread() const { return true; } 1866 // GC support 1867 // Apply "f->do_oop" to all root oops in "this". 1868 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 1869 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1870 }; 1871 1872 // A thread used for Compilation. 1873 class CompilerThread : public JavaThread { 1874 friend class VMStructs; 1875 private: 1876 CompilerCounters* _counters; 1877 1878 ciEnv* _env; 1879 CompileLog* _log; 1880 CompileTask* _task; 1881 CompileQueue* _queue; 1882 BufferBlob* _buffer_blob; 1883 1884 AbstractCompiler* _compiler; 1885 1886 public: 1887 1888 static CompilerThread* current(); 1889 1890 CompilerThread(CompileQueue* queue, CompilerCounters* counters); 1891 1892 bool is_Compiler_thread() const { return true; } 1893 1894 virtual bool can_call_java() const; 1895 1896 // Hide native compiler threads from external view. 1897 bool is_hidden_from_external_view() const { return !can_call_java(); } 1898 1899 void set_compiler(AbstractCompiler* c) { _compiler = c; } 1900 AbstractCompiler* compiler() const { return _compiler; } 1901 1902 CompileQueue* queue() const { return _queue; } 1903 CompilerCounters* counters() const { return _counters; } 1904 1905 // Get/set the thread's compilation environment. 1906 ciEnv* env() { return _env; } 1907 void set_env(ciEnv* env) { _env = env; } 1908 1909 BufferBlob* get_buffer_blob() const { return _buffer_blob; } 1910 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; } 1911 1912 // Get/set the thread's logging information 1913 CompileLog* log() { return _log; } 1914 void init_log(CompileLog* log) { 1915 // Set once, for good. 1916 assert(_log == NULL, "set only once"); 1917 _log = log; 1918 } 1919 1920 #ifndef PRODUCT 1921 private: 1922 IdealGraphPrinter *_ideal_graph_printer; 1923 public: 1924 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } 1925 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } 1926 #endif 1927 1928 // Get/set the thread's current task 1929 CompileTask* task() { return _task; } 1930 void set_task(CompileTask* task) { _task = task; } 1931 }; 1932 1933 inline CompilerThread* CompilerThread::current() { 1934 return JavaThread::current()->as_CompilerThread(); 1935 } 1936 1937 // The active thread queue. It also keeps track of the current used 1938 // thread priorities. 1939 class Threads: AllStatic { 1940 friend class VMStructs; 1941 private: 1942 static JavaThread* _thread_list; 1943 static int _number_of_threads; 1944 static int _number_of_non_daemon_threads; 1945 static int _return_code; 1946 static int _thread_claim_parity; 1947 #ifdef ASSERT 1948 static bool _vm_complete; 1949 #endif 1950 1951 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS); 1952 static void initialize_jsr292_core_classes(TRAPS); 1953 public: 1954 // Thread management 1955 // force_daemon is a concession to JNI, where we may need to add a 1956 // thread to the thread list before allocating its thread object 1957 static void add(JavaThread* p, bool force_daemon = false); 1958 static void remove(JavaThread* p); 1959 static bool includes(JavaThread* p); 1960 static JavaThread* first() { return _thread_list; } 1961 static void threads_do(ThreadClosure* tc); 1962 1963 // Initializes the vm and creates the vm thread 1964 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 1965 static void convert_vm_init_libraries_to_agents(); 1966 static void create_vm_init_libraries(); 1967 static void create_vm_init_agents(); 1968 static void shutdown_vm_agents(); 1969 static bool destroy_vm(); 1970 // Supported VM versions via JNI 1971 // Includes JNI_VERSION_1_1 1972 static jboolean is_supported_jni_version_including_1_1(jint version); 1973 // Does not include JNI_VERSION_1_1 1974 static jboolean is_supported_jni_version(jint version); 1975 1976 // The "thread claim parity" provides a way for threads to be claimed 1977 // by parallel worker tasks. 1978 // 1979 // Each thread contains a a "parity" field. A task will claim the 1980 // thread only if its parity field is the same as the global parity, 1981 // which is updated by calling change_thread_claim_parity(). 1982 // 1983 // For this to work change_thread_claim_parity() needs to be called 1984 // exactly once in sequential code before starting parallel tasks 1985 // that should claim threads. 1986 // 1987 // New threads get their parity set to 0 and change_thread_claim_parity() 1988 // never set the global parity to 0. 1989 static int thread_claim_parity() { return _thread_claim_parity; } 1990 static void change_thread_claim_parity(); 1991 static void assert_all_threads_claimed() NOT_DEBUG_RETURN; 1992 1993 // Apply "f->do_oop" to all root oops in all threads. 1994 // This version may only be called by sequential code. 1995 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1996 // This version may be called by sequential or parallel code. 1997 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1998 // This creates a list of GCTasks, one per thread. 1999 static void create_thread_roots_tasks(GCTaskQueue* q); 2000 // This creates a list of GCTasks, one per thread, for marking objects. 2001 static void create_thread_roots_marking_tasks(GCTaskQueue* q); 2002 2003 // Apply "f->do_oop" to roots in all threads that 2004 // are part of compiled frames 2005 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); 2006 2007 static void convert_hcode_pointers(); 2008 static void restore_hcode_pointers(); 2009 2010 // Sweeper 2011 static void nmethods_do(CodeBlobClosure* cf); 2012 2013 // RedefineClasses support 2014 static void metadata_do(void f(Metadata*)); 2015 static void metadata_handles_do(void f(Metadata*)); 2016 2017 #ifdef ASSERT 2018 static bool is_vm_complete() { return _vm_complete; } 2019 #endif 2020 2021 // Verification 2022 static void verify(); 2023 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); 2024 static void print(bool print_stacks, bool internal_format) { 2025 // this function is only used by debug.cpp 2026 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); 2027 } 2028 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 2029 2030 // Get Java threads that are waiting to enter a monitor. If doLock 2031 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2032 // VM needs to be at a safepoint. 2033 static GrowableArray<JavaThread*>* get_pending_threads(int count, 2034 address monitor, bool doLock); 2035 2036 // Get owning Java thread from the monitor's owner field. If doLock 2037 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2038 // VM needs to be at a safepoint. 2039 static JavaThread *owning_thread_from_monitor_owner(address owner, 2040 bool doLock); 2041 2042 // Number of threads on the active threads list 2043 static int number_of_threads() { return _number_of_threads; } 2044 // Number of non-daemon threads on the active threads list 2045 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 2046 2047 // Deoptimizes all frames tied to marked nmethods 2048 static void deoptimized_wrt_marked_nmethods(); 2049 2050 static JavaThread* find_java_thread_from_java_tid(jlong java_tid); 2051 2052 }; 2053 2054 2055 // Thread iterator 2056 class ThreadClosure: public StackObj { 2057 public: 2058 virtual void do_thread(Thread* thread) = 0; 2059 }; 2060 2061 class SignalHandlerMark: public StackObj { 2062 private: 2063 Thread* _thread; 2064 public: 2065 SignalHandlerMark(Thread* t) { 2066 _thread = t; 2067 if (_thread) _thread->enter_signal_handler(); 2068 } 2069 ~SignalHandlerMark() { 2070 if (_thread) _thread->leave_signal_handler(); 2071 _thread = NULL; 2072 } 2073 }; 2074 2075 2076 #endif // SHARE_VM_RUNTIME_THREAD_HPP