1 /* 2 * Copyright (c) 1997, 2018, 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 "jni.h" 29 #include "gc/shared/gcThreadLocalData.hpp" 30 #include "gc/shared/threadLocalAllocBuffer.hpp" 31 #include "memory/allocation.hpp" 32 #include "oops/oop.hpp" 33 #include "prims/jvmtiExport.hpp" 34 #include "runtime/frame.hpp" 35 #include "runtime/globals.hpp" 36 #include "runtime/handshake.hpp" 37 #include "runtime/javaFrameAnchor.hpp" 38 #include "runtime/jniHandles.hpp" 39 #include "runtime/mutexLocker.hpp" 40 #include "runtime/os.hpp" 41 #include "runtime/osThread.hpp" 42 #include "runtime/park.hpp" 43 #include "runtime/safepoint.hpp" 44 #include "runtime/stubRoutines.hpp" 45 #include "runtime/threadHeapSampler.hpp" 46 #include "runtime/threadLocalStorage.hpp" 47 #include "runtime/threadStatisticalInfo.hpp" 48 #include "runtime/unhandledOops.hpp" 49 #include "utilities/align.hpp" 50 #include "utilities/exceptions.hpp" 51 #include "utilities/macros.hpp" 52 #ifdef ZERO 53 # include "stack_zero.hpp" 54 #endif 55 #if INCLUDE_JFR 56 #include "jfr/support/jfrThreadExtension.hpp" 57 #endif 58 59 class BehaviourProvider; 60 61 class SafeThreadsListPtr; 62 class ThreadSafepointState; 63 class ThreadsList; 64 class ThreadsSMRSupport; 65 66 class JvmtiThreadState; 67 class JvmtiGetLoadedClassesClosure; 68 class ThreadStatistics; 69 class ConcurrentLocksDump; 70 class ParkEvent; 71 class Parker; 72 73 class ciEnv; 74 class CompileThread; 75 class CompileLog; 76 class CompileTask; 77 class CompileQueue; 78 class CompilerCounters; 79 class vframeArray; 80 81 class DeoptResourceMark; 82 class jvmtiDeferredLocalVariableSet; 83 84 class GCTaskQueue; 85 class ThreadClosure; 86 class IdealGraphPrinter; 87 88 class Metadata; 89 template <class T, MEMFLAGS F> class ChunkedList; 90 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer; 91 92 DEBUG_ONLY(class ResourceMark;) 93 94 class WorkerThread; 95 96 // Class hierarchy 97 // - Thread 98 // - NamedThread 99 // - VMThread 100 // - ConcurrentGCThread 101 // - WorkerThread 102 // - GangWorker 103 // - GCTaskThread 104 // - JavaThread 105 // - various subclasses eg CompilerThread, ServiceThread 106 // - WatcherThread 107 108 class Thread: public ThreadShadow { 109 friend class VMStructs; 110 friend class JVMCIVMStructs; 111 private: 112 113 #ifndef USE_LIBRARY_BASED_TLS_ONLY 114 // Current thread is maintained as a thread-local variable 115 static THREAD_LOCAL_DECL Thread* _thr_current; 116 #endif 117 118 private: 119 // Thread local data area available to the GC. The internal 120 // structure and contents of this data area is GC-specific. 121 // Only GC and GC barrier code should access this data area. 122 GCThreadLocalData _gc_data; 123 124 public: 125 static ByteSize gc_data_offset() { 126 return byte_offset_of(Thread, _gc_data); 127 } 128 129 template <typename T> T* gc_data() { 130 STATIC_ASSERT(sizeof(T) <= sizeof(_gc_data)); 131 return reinterpret_cast<T*>(&_gc_data); 132 } 133 134 // Exception handling 135 // (Note: _pending_exception and friends are in ThreadShadow) 136 //oop _pending_exception; // pending exception for current thread 137 // const char* _exception_file; // file information for exception (debugging only) 138 // int _exception_line; // line information for exception (debugging only) 139 protected: 140 // Support for forcing alignment of thread objects for biased locking 141 void* _real_malloc_address; 142 143 // JavaThread lifecycle support: 144 friend class SafeThreadsListPtr; // for _threads_list_ptr, cmpxchg_threads_hazard_ptr(), {dec_,inc_,}nested_threads_hazard_ptr_cnt(), {g,s}et_threads_hazard_ptr(), inc_nested_handle_cnt(), tag_hazard_ptr() access 145 friend class ScanHazardPtrGatherProtectedThreadsClosure; // for cmpxchg_threads_hazard_ptr(), get_threads_hazard_ptr(), is_hazard_ptr_tagged() access 146 friend class ScanHazardPtrGatherThreadsListClosure; // for get_threads_hazard_ptr(), untag_hazard_ptr() access 147 friend class ScanHazardPtrPrintMatchingThreadsClosure; // for get_threads_hazard_ptr(), is_hazard_ptr_tagged() access 148 friend class ThreadsSMRSupport; // for _nested_threads_hazard_ptr_cnt, _threads_hazard_ptr, _threads_list_ptr access 149 150 ThreadsList* volatile _threads_hazard_ptr; 151 SafeThreadsListPtr* _threads_list_ptr; 152 ThreadsList* cmpxchg_threads_hazard_ptr(ThreadsList* exchange_value, ThreadsList* compare_value); 153 ThreadsList* get_threads_hazard_ptr(); 154 void set_threads_hazard_ptr(ThreadsList* new_list); 155 static bool is_hazard_ptr_tagged(ThreadsList* list) { 156 return (intptr_t(list) & intptr_t(1)) == intptr_t(1); 157 } 158 static ThreadsList* tag_hazard_ptr(ThreadsList* list) { 159 return (ThreadsList*)(intptr_t(list) | intptr_t(1)); 160 } 161 static ThreadsList* untag_hazard_ptr(ThreadsList* list) { 162 return (ThreadsList*)(intptr_t(list) & ~intptr_t(1)); 163 } 164 // This field is enabled via -XX:+EnableThreadSMRStatistics: 165 uint _nested_threads_hazard_ptr_cnt; 166 void dec_nested_threads_hazard_ptr_cnt() { 167 assert(_nested_threads_hazard_ptr_cnt != 0, "mismatched {dec,inc}_nested_threads_hazard_ptr_cnt()"); 168 _nested_threads_hazard_ptr_cnt--; 169 } 170 void inc_nested_threads_hazard_ptr_cnt() { 171 _nested_threads_hazard_ptr_cnt++; 172 } 173 uint nested_threads_hazard_ptr_cnt() { 174 return _nested_threads_hazard_ptr_cnt; 175 } 176 177 BehaviourProvider* _behaviour_provider; 178 179 public: 180 BehaviourProvider* behaviour_provider() const { return _behaviour_provider; } 181 void set_behaviour_provider(BehaviourProvider* behaviour_provider) { _behaviour_provider = behaviour_provider; } 182 183 void* operator new(size_t size) throw() { return allocate(size, true); } 184 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 185 return allocate(size, false); } 186 void operator delete(void* p); 187 188 protected: 189 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 190 private: 191 192 // *************************************************************** 193 // Suspend and resume support 194 // *************************************************************** 195 // 196 // VM suspend/resume no longer exists - it was once used for various 197 // things including safepoints but was deprecated and finally removed 198 // in Java 7. Because VM suspension was considered "internal" Java-level 199 // suspension was considered "external", and this legacy naming scheme 200 // remains. 201 // 202 // External suspend/resume requests come from JVM_SuspendThread, 203 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI 204 // ResumeThread. External 205 // suspend requests cause _external_suspend to be set and external 206 // resume requests cause _external_suspend to be cleared. 207 // External suspend requests do not nest on top of other external 208 // suspend requests. The higher level APIs reject suspend requests 209 // for already suspended threads. 210 // 211 // The external_suspend 212 // flag is checked by has_special_runtime_exit_condition() and java thread 213 // will self-suspend when handle_special_runtime_exit_condition() is 214 // called. Most uses of the _thread_blocked state in JavaThreads are 215 // considered the same as being externally suspended; if the blocking 216 // condition lifts, the JavaThread will self-suspend. Other places 217 // where VM checks for external_suspend include: 218 // + mutex granting (do not enter monitors when thread is suspended) 219 // + state transitions from _thread_in_native 220 // 221 // In general, java_suspend() does not wait for an external suspend 222 // request to complete. When it returns, the only guarantee is that 223 // the _external_suspend field is true. 224 // 225 // wait_for_ext_suspend_completion() is used to wait for an external 226 // suspend request to complete. External suspend requests are usually 227 // followed by some other interface call that requires the thread to 228 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into 229 // the interface that requires quiescence, we give the JavaThread a 230 // chance to self-suspend before we need it to be quiescent. This 231 // improves overall suspend/query performance. 232 // 233 // _suspend_flags controls the behavior of java_ suspend/resume. 234 // It must be set under the protection of SR_lock. Read from the flag is 235 // OK without SR_lock as long as the value is only used as a hint. 236 // (e.g., check _external_suspend first without lock and then recheck 237 // inside SR_lock and finish the suspension) 238 // 239 // _suspend_flags is also overloaded for other "special conditions" so 240 // that a single check indicates whether any special action is needed 241 // eg. for async exceptions. 242 // ------------------------------------------------------------------- 243 // Notes: 244 // 1. The suspend/resume logic no longer uses ThreadState in OSThread 245 // but we still update its value to keep other part of the system (mainly 246 // JVMTI) happy. ThreadState is legacy code (see notes in 247 // osThread.hpp). 248 // 249 // 2. It would be more natural if set_external_suspend() is private and 250 // part of java_suspend(), but that probably would affect the suspend/query 251 // performance. Need more investigation on this. 252 253 // suspend/resume lock: used for self-suspend 254 Monitor* _SR_lock; 255 256 protected: 257 enum SuspendFlags { 258 // NOTE: avoid using the sign-bit as cc generates different test code 259 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 260 261 _external_suspend = 0x20000000U, // thread is asked to self suspend 262 _ext_suspended = 0x40000000U, // thread has self-suspended 263 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt 264 265 _has_async_exception = 0x00000001U, // there is a pending async exception 266 _critical_native_unlock = 0x00000002U, // Must call back to unlock JNI critical lock 267 268 _trace_flag = 0x00000004U // call tracing backend 269 }; 270 271 // various suspension related flags - atomically updated 272 // overloaded for async exception checking in check_special_condition_for_native_trans. 273 volatile uint32_t _suspend_flags; 274 275 private: 276 int _num_nested_signal; 277 278 DEBUG_ONLY(bool _suspendible_thread;) 279 280 public: 281 void enter_signal_handler() { _num_nested_signal++; } 282 void leave_signal_handler() { _num_nested_signal--; } 283 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } 284 285 #ifdef ASSERT 286 void set_suspendible_thread() { 287 _suspendible_thread = true; 288 } 289 290 void clear_suspendible_thread() { 291 _suspendible_thread = false; 292 } 293 294 bool is_suspendible_thread() { return _suspendible_thread; } 295 #endif 296 297 private: 298 // Active_handles points to a block of handles 299 JNIHandleBlock* _active_handles; 300 301 // One-element thread local free list 302 JNIHandleBlock* _free_handle_block; 303 304 // Point to the last handle mark 305 HandleMark* _last_handle_mark; 306 307 // The parity of the last strong_roots iteration in which this thread was 308 // claimed as a task. 309 int _oops_do_parity; 310 311 // Support for GlobalCounter 312 private: 313 volatile uintx _rcu_counter; 314 public: 315 volatile uintx* get_rcu_counter() { 316 return &_rcu_counter; 317 } 318 319 public: 320 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 321 HandleMark* last_handle_mark() const { return _last_handle_mark; } 322 private: 323 324 // debug support for checking if code does allow safepoints or not 325 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on 326 // mutex, or blocking on an object synchronizer (Java locking). 327 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases 328 // If !allow_allocation(), then an assertion failure will happen during allocation 329 // (Hence, !allow_safepoint() => !allow_allocation()). 330 // 331 // The two classes NoSafepointVerifier and No_Allocation_Verifier are used to set these counters. 332 // 333 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen 334 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. 335 336 // Used by SkipGCALot class. 337 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 338 339 friend class NoAllocVerifier; 340 friend class NoSafepointVerifier; 341 friend class PauseNoSafepointVerifier; 342 friend class GCLocker; 343 344 volatile void* _polling_page; // Thread local polling page 345 346 ThreadLocalAllocBuffer _tlab; // Thread-local eden 347 jlong _allocated_bytes; // Cumulative number of bytes allocated on 348 // the Java heap 349 ThreadHeapSampler _heap_sampler; // For use when sampling the memory. 350 351 ThreadStatisticalInfo _statistical_info; // Statistics about the thread 352 353 JFR_ONLY(DEFINE_THREAD_LOCAL_FIELD_JFR;) // Thread-local data for jfr 354 355 int _vm_operation_started_count; // VM_Operation support 356 int _vm_operation_completed_count; // VM_Operation support 357 358 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread 359 // is waiting to lock 360 bool _current_pending_monitor_is_from_java; // locking is from Java code 361 362 // ObjectMonitor on which this thread called Object.wait() 363 ObjectMonitor* _current_waiting_monitor; 364 365 // Private thread-local objectmonitor list - a simple cache organized as a SLL. 366 public: 367 ObjectMonitor* omFreeList; 368 int omFreeCount; // length of omFreeList 369 int omFreeProvision; // reload chunk size 370 ObjectMonitor* omInUseList; // SLL to track monitors in circulation 371 int omInUseCount; // length of omInUseList 372 373 #ifdef ASSERT 374 private: 375 bool _visited_for_critical_count; 376 377 public: 378 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } 379 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } 380 #endif 381 382 public: 383 enum { 384 is_definitely_current_thread = true 385 }; 386 387 // Constructor 388 Thread(); 389 virtual ~Thread(); 390 391 // Manage Thread::current() 392 void initialize_thread_current(); 393 void clear_thread_current(); // TLS cleanup needed before threads terminate 394 395 public: 396 // thread entry point 397 virtual void run(); 398 399 // Testers 400 virtual bool is_VM_thread() const { return false; } 401 virtual bool is_Java_thread() const { return false; } 402 virtual bool is_Compiler_thread() const { return false; } 403 virtual bool is_Code_cache_sweeper_thread() const { return false; } 404 virtual bool is_hidden_from_external_view() const { return false; } 405 virtual bool is_jvmti_agent_thread() const { return false; } 406 // True iff the thread can perform GC operations at a safepoint. 407 // Generally will be true only of VM thread and parallel GC WorkGang 408 // threads. 409 virtual bool is_GC_task_thread() const { return false; } 410 virtual bool is_Watcher_thread() const { return false; } 411 virtual bool is_ConcurrentGC_thread() const { return false; } 412 virtual bool is_Named_thread() const { return false; } 413 virtual bool is_Worker_thread() const { return false; } 414 415 // Can this thread make Java upcalls 416 virtual bool can_call_java() const { return false; } 417 418 // Casts 419 virtual WorkerThread* as_Worker_thread() const { return NULL; } 420 421 virtual char* name() const { return (char*)"Unknown thread"; } 422 423 // Returns the current thread (ASSERTS if NULL) 424 static inline Thread* current(); 425 // Returns the current thread, or NULL if not attached 426 static inline Thread* current_or_null(); 427 // Returns the current thread, or NULL if not attached, and is 428 // safe for use from signal-handlers 429 static inline Thread* current_or_null_safe(); 430 431 // Common thread operations 432 #ifdef ASSERT 433 static void check_for_dangling_thread_pointer(Thread *thread); 434 #endif 435 static void set_priority(Thread* thread, ThreadPriority priority); 436 static ThreadPriority get_priority(const Thread* const thread); 437 static void start(Thread* thread); 438 static void interrupt(Thread* thr); 439 static bool is_interrupted(Thread* thr, bool clear_interrupted); 440 441 void set_native_thread_name(const char *name) { 442 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); 443 os::set_native_thread_name(name); 444 } 445 446 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } 447 Monitor* SR_lock() const { return _SR_lock; } 448 449 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } 450 451 inline void set_suspend_flag(SuspendFlags f); 452 inline void clear_suspend_flag(SuspendFlags f); 453 454 inline void set_has_async_exception(); 455 inline void clear_has_async_exception(); 456 457 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } 458 459 inline void set_critical_native_unlock(); 460 inline void clear_critical_native_unlock(); 461 462 inline void set_trace_flag(); 463 inline void clear_trace_flag(); 464 465 // Support for Unhandled Oop detection 466 // Add the field for both, fastdebug and debug, builds to keep 467 // Thread's fields layout the same. 468 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build. 469 #ifdef CHECK_UNHANDLED_OOPS 470 private: 471 UnhandledOops* _unhandled_oops; 472 #elif defined(ASSERT) 473 private: 474 void* _unhandled_oops; 475 #endif 476 #ifdef CHECK_UNHANDLED_OOPS 477 public: 478 UnhandledOops* unhandled_oops() { return _unhandled_oops; } 479 // Mark oop safe for gc. It may be stack allocated but won't move. 480 void allow_unhandled_oop(oop *op) { 481 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); 482 } 483 // Clear oops at safepoint so crashes point to unhandled oop violator 484 void clear_unhandled_oops() { 485 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); 486 } 487 #endif // CHECK_UNHANDLED_OOPS 488 489 public: 490 #ifndef PRODUCT 491 bool skip_gcalot() { return _skip_gcalot; } 492 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 493 #endif 494 495 // Installs a pending exception to be inserted later 496 static void send_async_exception(oop thread_oop, oop java_throwable); 497 498 // Resource area 499 ResourceArea* resource_area() const { return _resource_area; } 500 void set_resource_area(ResourceArea* area) { _resource_area = area; } 501 502 OSThread* osthread() const { return _osthread; } 503 void set_osthread(OSThread* thread) { _osthread = thread; } 504 505 // JNI handle support 506 JNIHandleBlock* active_handles() const { return _active_handles; } 507 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 508 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 509 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 510 511 // Internal handle support 512 HandleArea* handle_area() const { return _handle_area; } 513 void set_handle_area(HandleArea* area) { _handle_area = area; } 514 515 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 516 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 517 518 // Thread-Local Allocation Buffer (TLAB) support 519 ThreadLocalAllocBuffer& tlab() { return _tlab; } 520 void initialize_tlab() { 521 if (UseTLAB) { 522 tlab().initialize(); 523 } 524 } 525 526 jlong allocated_bytes() { return _allocated_bytes; } 527 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 528 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 529 inline jlong cooked_allocated_bytes(); 530 531 ThreadHeapSampler& heap_sampler() { return _heap_sampler; } 532 533 ThreadStatisticalInfo& statistical_info() { return _statistical_info; } 534 535 JFR_ONLY(DEFINE_THREAD_LOCAL_ACCESSOR_JFR;) 536 537 bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; } 538 539 // VM operation support 540 int vm_operation_ticket() { return ++_vm_operation_started_count; } 541 int vm_operation_completed_count() { return _vm_operation_completed_count; } 542 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } 543 544 // For tracking the heavyweight monitor the thread is pending on. 545 ObjectMonitor* current_pending_monitor() { 546 return _current_pending_monitor; 547 } 548 void set_current_pending_monitor(ObjectMonitor* monitor) { 549 _current_pending_monitor = monitor; 550 } 551 void set_current_pending_monitor_is_from_java(bool from_java) { 552 _current_pending_monitor_is_from_java = from_java; 553 } 554 bool current_pending_monitor_is_from_java() { 555 return _current_pending_monitor_is_from_java; 556 } 557 558 // For tracking the ObjectMonitor on which this thread called Object.wait() 559 ObjectMonitor* current_waiting_monitor() { 560 return _current_waiting_monitor; 561 } 562 void set_current_waiting_monitor(ObjectMonitor* monitor) { 563 _current_waiting_monitor = monitor; 564 } 565 566 // GC support 567 // Apply "f->do_oop" to all root oops in "this". 568 // Used by JavaThread::oops_do. 569 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 570 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf); 571 572 // Handles the parallel case for the method below. 573 private: 574 bool claim_oops_do_par_case(int collection_parity); 575 public: 576 // Requires that "collection_parity" is that of the current roots 577 // iteration. If "is_par" is false, sets the parity of "this" to 578 // "collection_parity", and returns "true". If "is_par" is true, 579 // uses an atomic instruction to set the current threads parity to 580 // "collection_parity", if it is not already. Returns "true" iff the 581 // calling thread does the update, this indicates that the calling thread 582 // has claimed the thread's stack as a root groop in the current 583 // collection. 584 bool claim_oops_do(bool is_par, int collection_parity) { 585 if (!is_par) { 586 _oops_do_parity = collection_parity; 587 return true; 588 } else { 589 return claim_oops_do_par_case(collection_parity); 590 } 591 } 592 593 // jvmtiRedefineClasses support 594 void metadata_handles_do(void f(Metadata*)); 595 596 // Used by fast lock support 597 virtual bool is_lock_owned(address adr) const; 598 599 // Check if address is in the stack of the thread (not just for locks). 600 // Warning: the method can only be used on the running thread 601 bool is_in_stack(address adr) const; 602 // Check if address is in the usable part of the stack (excludes protected 603 // guard pages) 604 bool is_in_usable_stack(address adr) const; 605 606 // Sets this thread as starting thread. Returns failure if thread 607 // creation fails due to lack of memory, too many threads etc. 608 bool set_as_starting_thread(); 609 610 protected: 611 // OS data associated with the thread 612 OSThread* _osthread; // Platform-specific thread information 613 614 // Thread local resource area for temporary allocation within the VM 615 ResourceArea* _resource_area; 616 617 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 618 619 // Thread local handle area for allocation of handles within the VM 620 HandleArea* _handle_area; 621 GrowableArray<Metadata*>* _metadata_handles; 622 623 // Support for stack overflow handling, get_thread, etc. 624 address _stack_base; 625 size_t _stack_size; 626 uintptr_t _self_raw_id; // used by get_thread (mutable) 627 int _lgrp_id; 628 629 volatile void** polling_page_addr() { return &_polling_page; } 630 631 public: 632 // Stack overflow support 633 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 634 void set_stack_base(address base) { _stack_base = base; } 635 size_t stack_size() const { return _stack_size; } 636 void set_stack_size(size_t size) { _stack_size = size; } 637 address stack_end() const { return stack_base() - stack_size(); } 638 void record_stack_base_and_size(); 639 640 bool on_local_stack(address adr) const { 641 // QQQ this has knowledge of direction, ought to be a stack method 642 return (_stack_base >= adr && adr >= stack_end()); 643 } 644 645 uintptr_t self_raw_id() { return _self_raw_id; } 646 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } 647 648 int lgrp_id() const { return _lgrp_id; } 649 void set_lgrp_id(int value) { _lgrp_id = value; } 650 651 // Printing 652 void print_on(outputStream* st, bool print_extended_info) const; 653 virtual void print_on(outputStream* st) const { print_on(st, false); } 654 void print() const { print_on(tty); } 655 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 656 void print_value_on(outputStream* st) const; 657 658 // Debug-only code 659 #ifdef ASSERT 660 private: 661 // Deadlock detection support for Mutex locks. List of locks own by thread. 662 Monitor* _owned_locks; 663 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 664 // thus the friendship 665 friend class Mutex; 666 friend class Monitor; 667 668 public: 669 void print_owned_locks_on(outputStream* st) const; 670 void print_owned_locks() const { print_owned_locks_on(tty); } 671 Monitor* owned_locks() const { return _owned_locks; } 672 bool owns_locks() const { return owned_locks() != NULL; } 673 bool owns_locks_but_compiled_lock() const; 674 int oops_do_parity() const { return _oops_do_parity; } 675 676 // Deadlock detection 677 bool allow_allocation() { return _allow_allocation_count == 0; } 678 ResourceMark* current_resource_mark() { return _current_resource_mark; } 679 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 680 #endif 681 682 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; 683 684 private: 685 volatile int _jvmti_env_iteration_count; 686 687 public: 688 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 689 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 690 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 691 692 // Code generation 693 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); } 694 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); } 695 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); } 696 697 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); } 698 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); } 699 700 static ByteSize polling_page_offset() { return byte_offset_of(Thread, _polling_page); } 701 702 #define TLAB_FIELD_OFFSET(name) \ 703 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } 704 705 TLAB_FIELD_OFFSET(start) 706 TLAB_FIELD_OFFSET(end) 707 TLAB_FIELD_OFFSET(top) 708 TLAB_FIELD_OFFSET(pf_top) 709 TLAB_FIELD_OFFSET(size) // desired_size 710 TLAB_FIELD_OFFSET(refill_waste_limit) 711 TLAB_FIELD_OFFSET(number_of_refills) 712 TLAB_FIELD_OFFSET(fast_refill_waste) 713 TLAB_FIELD_OFFSET(slow_allocations) 714 715 #undef TLAB_FIELD_OFFSET 716 717 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); } 718 719 JFR_ONLY(DEFINE_THREAD_LOCAL_OFFSET_JFR;) 720 721 public: 722 volatile intptr_t _Stalled; 723 volatile int _TypeTag; 724 ParkEvent * _ParkEvent; // for synchronized() 725 ParkEvent * _SleepEvent; // for Thread.sleep 726 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor 727 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease 728 int NativeSyncRecursion; // diagnostic 729 730 volatile int _OnTrap; // Resume-at IP delta 731 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG 732 jint _hashStateX; // thread-specific hashCode generator state 733 jint _hashStateY; 734 jint _hashStateZ; 735 736 volatile jint rng[4]; // RNG for spin loop 737 738 // Low-level leaf-lock primitives used to implement synchronization 739 // and native monitor-mutex infrastructure. 740 // Not for general synchronization use. 741 static void SpinAcquire(volatile int * Lock, const char * Name); 742 static void SpinRelease(volatile int * Lock); 743 static void muxAcquire(volatile intptr_t * Lock, const char * Name); 744 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev); 745 static void muxRelease(volatile intptr_t * Lock); 746 }; 747 748 // Inline implementation of Thread::current() 749 inline Thread* Thread::current() { 750 Thread* current = current_or_null(); 751 assert(current != NULL, "Thread::current() called on detached thread"); 752 return current; 753 } 754 755 inline Thread* Thread::current_or_null() { 756 #ifndef USE_LIBRARY_BASED_TLS_ONLY 757 return _thr_current; 758 #else 759 if (ThreadLocalStorage::is_initialized()) { 760 return ThreadLocalStorage::thread(); 761 } 762 return NULL; 763 #endif 764 } 765 766 inline Thread* Thread::current_or_null_safe() { 767 if (ThreadLocalStorage::is_initialized()) { 768 return ThreadLocalStorage::thread(); 769 } 770 return NULL; 771 } 772 773 // Name support for threads. non-JavaThread subclasses with multiple 774 // uniquely named instances should derive from this. 775 class NamedThread: public Thread { 776 friend class VMStructs; 777 enum { 778 max_name_len = 64 779 }; 780 private: 781 char* _name; 782 // log JavaThread being processed by oops_do 783 JavaThread* _processed_thread; 784 uint _gc_id; // The current GC id when a thread takes part in GC 785 786 public: 787 NamedThread(); 788 ~NamedThread(); 789 // May only be called once per thread. 790 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); 791 void initialize_named_thread(); 792 virtual bool is_Named_thread() const { return true; } 793 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } 794 JavaThread *processed_thread() { return _processed_thread; } 795 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } 796 virtual void print_on(outputStream* st) const; 797 798 void set_gc_id(uint gc_id) { _gc_id = gc_id; } 799 uint gc_id() { return _gc_id; } 800 }; 801 802 // Worker threads are named and have an id of an assigned work. 803 class WorkerThread: public NamedThread { 804 private: 805 uint _id; 806 public: 807 WorkerThread() : _id(0) { } 808 virtual bool is_Worker_thread() const { return true; } 809 810 virtual WorkerThread* as_Worker_thread() const { 811 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); 812 return (WorkerThread*) this; 813 } 814 815 void set_id(uint work_id) { _id = work_id; } 816 uint id() const { return _id; } 817 }; 818 819 // A single WatcherThread is used for simulating timer interrupts. 820 class WatcherThread: public Thread { 821 friend class VMStructs; 822 public: 823 virtual void run(); 824 825 private: 826 static WatcherThread* _watcher_thread; 827 828 static bool _startable; 829 // volatile due to at least one lock-free read 830 volatile static bool _should_terminate; 831 public: 832 enum SomeConstants { 833 delay_interval = 10 // interrupt delay in milliseconds 834 }; 835 836 // Constructor 837 WatcherThread(); 838 839 // No destruction allowed 840 ~WatcherThread() { 841 guarantee(false, "WatcherThread deletion must fix the race with VM termination"); 842 } 843 844 // Tester 845 bool is_Watcher_thread() const { return true; } 846 847 // Printing 848 char* name() const { return (char*)"VM Periodic Task Thread"; } 849 void print_on(outputStream* st) const; 850 void unpark(); 851 852 // Returns the single instance of WatcherThread 853 static WatcherThread* watcher_thread() { return _watcher_thread; } 854 855 // Create and start the single instance of WatcherThread, or stop it on shutdown 856 static void start(); 857 static void stop(); 858 // Only allow start once the VM is sufficiently initialized 859 // Otherwise the first task to enroll will trigger the start 860 static void make_startable(); 861 private: 862 int sleep() const; 863 }; 864 865 866 class CompilerThread; 867 868 typedef void (*ThreadFunction)(JavaThread*, TRAPS); 869 870 class JavaThread: public Thread { 871 friend class VMStructs; 872 friend class JVMCIVMStructs; 873 friend class WhiteBox; 874 private: 875 JavaThread* _next; // The next thread in the Threads list 876 bool _on_thread_list; // Is set when this JavaThread is added to the Threads list 877 oop _threadObj; // The Java level thread object 878 879 #ifdef ASSERT 880 private: 881 int _java_call_counter; 882 883 public: 884 int java_call_counter() { return _java_call_counter; } 885 void inc_java_call_counter() { _java_call_counter++; } 886 void dec_java_call_counter() { 887 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 888 _java_call_counter--; 889 } 890 private: // restore original namespace restriction 891 #endif // ifdef ASSERT 892 893 #ifndef PRODUCT 894 public: 895 enum { 896 jump_ring_buffer_size = 16 897 }; 898 private: // restore original namespace restriction 899 #endif 900 901 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 902 903 ThreadFunction _entry_point; 904 905 JNIEnv _jni_environment; 906 907 // Deopt support 908 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 909 910 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we 911 // transition out of native 912 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized 913 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 914 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 915 // Because deoptimization is lazy we must save jvmti requests to set locals 916 // in compiled frames until we deoptimize and we have an interpreter frame. 917 // This holds the pointer to array (yeah like there might be more than one) of 918 // description of compiled vframes that have locals that need to be updated. 919 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; 920 921 // Handshake value for fixing 6243940. We need a place for the i2c 922 // adapter to store the callee Method*. This value is NEVER live 923 // across a gc point so it does NOT have to be gc'd 924 // The handshake is open ended since we can't be certain that it will 925 // be NULLed. This is because we rarely ever see the race and end up 926 // in handle_wrong_method which is the backend of the handshake. See 927 // code in i2c adapters and handle_wrong_method. 928 929 Method* _callee_target; 930 931 // Used to pass back results to the interpreter or generated code running Java code. 932 oop _vm_result; // oop result is GC-preserved 933 Metadata* _vm_result_2; // non-oop result 934 935 // See ReduceInitialCardMarks: this holds the precise space interval of 936 // the most recent slow path allocation for which compiled code has 937 // elided card-marks for performance along the fast-path. 938 MemRegion _deferred_card_mark; 939 940 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 941 // allocated during deoptimization 942 // and by JNI_MonitorEnter/Exit 943 944 // Async. requests support 945 enum AsyncRequests { 946 _no_async_condition = 0, 947 _async_exception, 948 _async_unsafe_access_error 949 }; 950 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request 951 oop _pending_async_exception; 952 953 // Safepoint support 954 public: // Expose _thread_state for SafeFetchInt() 955 volatile JavaThreadState _thread_state; 956 private: 957 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint 958 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 959 960 // JavaThread termination support 961 enum TerminatedTypes { 962 _not_terminated = 0xDEAD - 2, 963 _thread_exiting, // JavaThread::exit() has been called for this thread 964 _thread_terminated, // JavaThread is removed from thread list 965 _vm_exited // JavaThread is still executing native code, but VM is terminated 966 // only VM_Exit can set _vm_exited 967 }; 968 969 // In general a JavaThread's _terminated field transitions as follows: 970 // 971 // _not_terminated => _thread_exiting => _thread_terminated 972 // 973 // _vm_exited is a special value to cover the case of a JavaThread 974 // executing native code after the VM itself is terminated. 975 volatile TerminatedTypes _terminated; 976 // suspend/resume support 977 volatile bool _suspend_equivalent; // Suspend equivalent condition 978 jint _in_deopt_handler; // count of deoptimization 979 // handlers thread is in 980 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 981 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 982 // never locked) when throwing an exception. Used by interpreter only. 983 984 // JNI attach states: 985 enum JNIAttachStates { 986 _not_attaching_via_jni = 1, // thread is not attaching via JNI 987 _attaching_via_jni, // thread is attaching via JNI 988 _attached_via_jni // thread has attached via JNI 989 }; 990 991 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 992 // A native thread that is attaching via JNI starts with a value 993 // of _attaching_via_jni and transitions to _attached_via_jni. 994 volatile JNIAttachStates _jni_attach_state; 995 996 public: 997 // State of the stack guard pages for this thread. 998 enum StackGuardState { 999 stack_guard_unused, // not needed 1000 stack_guard_reserved_disabled, 1001 stack_guard_yellow_reserved_disabled,// disabled (temporarily) after stack overflow 1002 stack_guard_enabled // enabled 1003 }; 1004 1005 private: 1006 1007 #if INCLUDE_JVMCI 1008 // The _pending_* fields below are used to communicate extra information 1009 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. 1010 1011 // Communicates the DeoptReason and DeoptAction of the uncommon trap 1012 int _pending_deoptimization; 1013 1014 // Specifies whether the uncommon trap is to bci 0 of a synchronized method 1015 // before the monitor has been acquired. 1016 bool _pending_monitorenter; 1017 1018 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter 1019 bool _pending_transfer_to_interpreter; 1020 1021 // Guard for re-entrant call to JVMCIRuntime::adjust_comp_level 1022 bool _adjusting_comp_level; 1023 1024 // An id of a speculation that JVMCI compiled code can use to further describe and 1025 // uniquely identify the speculative optimization guarded by the uncommon trap 1026 long _pending_failed_speculation; 1027 1028 // These fields are mutually exclusive in terms of live ranges. 1029 union { 1030 // Communicates the pc at which the most recent implicit exception occurred 1031 // from the signal handler to a deoptimization stub. 1032 address _implicit_exception_pc; 1033 1034 // Communicates an alternative call target to an i2c stub from a JavaCall . 1035 address _alternate_call_target; 1036 } _jvmci; 1037 1038 // Support for high precision, thread sensitive counters in JVMCI compiled code. 1039 jlong* _jvmci_counters; 1040 1041 public: 1042 static jlong* _jvmci_old_thread_counters; 1043 static void collect_counters(typeArrayOop array); 1044 private: 1045 #endif // INCLUDE_JVMCI 1046 1047 StackGuardState _stack_guard_state; 1048 1049 // Precompute the limit of the stack as used in stack overflow checks. 1050 // We load it from here to simplify the stack overflow check in assembly. 1051 address _stack_overflow_limit; 1052 address _reserved_stack_activation; 1053 1054 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 1055 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 1056 // code) 1057 volatile oop _exception_oop; // Exception thrown in compiled code 1058 volatile address _exception_pc; // PC where exception happened 1059 volatile address _exception_handler_pc; // PC for handler of exception 1060 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 1061 1062 private: 1063 // support for JNI critical regions 1064 jint _jni_active_critical; // count of entries into JNI critical region 1065 1066 // Checked JNI: function name requires exception check 1067 char* _pending_jni_exception_check_fn; 1068 1069 // For deadlock detection. 1070 int _depth_first_number; 1071 1072 // JVMTI PopFrame support 1073 // This is set to popframe_pending to signal that top Java frame should be popped immediately 1074 int _popframe_condition; 1075 1076 // If reallocation of scalar replaced objects fails, we throw OOM 1077 // and during exception propagation, pop the top 1078 // _frames_to_pop_failed_realloc frames, the ones that reference 1079 // failed reallocations. 1080 int _frames_to_pop_failed_realloc; 1081 1082 #ifndef PRODUCT 1083 int _jmp_ring_index; 1084 struct { 1085 // We use intptr_t instead of address so debugger doesn't try and display strings 1086 intptr_t _target; 1087 intptr_t _instruction; 1088 const char* _file; 1089 int _line; 1090 } _jmp_ring[jump_ring_buffer_size]; 1091 #endif // PRODUCT 1092 1093 friend class VMThread; 1094 friend class ThreadWaitTransition; 1095 friend class VM_Exit; 1096 1097 void initialize(); // Initialized the instance variables 1098 1099 public: 1100 // Constructor 1101 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads 1102 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 1103 ~JavaThread(); 1104 1105 #ifdef ASSERT 1106 // verify this JavaThread hasn't be published in the Threads::list yet 1107 void verify_not_published(); 1108 #endif 1109 1110 //JNI functiontable getter/setter for JVMTI jni function table interception API. 1111 void set_jni_functions(struct JNINativeInterface_* functionTable) { 1112 _jni_environment.functions = functionTable; 1113 } 1114 struct JNINativeInterface_* get_jni_functions() { 1115 return (struct JNINativeInterface_ *)_jni_environment.functions; 1116 } 1117 1118 // This function is called at thread creation to allow 1119 // platform specific thread variables to be initialized. 1120 void cache_global_variables(); 1121 1122 // Executes Shutdown.shutdown() 1123 void invoke_shutdown_hooks(); 1124 1125 // Cleanup on thread exit 1126 enum ExitType { 1127 normal_exit, 1128 jni_detach 1129 }; 1130 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 1131 1132 void cleanup_failed_attach_current_thread(); 1133 1134 // Testers 1135 virtual bool is_Java_thread() const { return true; } 1136 virtual bool can_call_java() const { return true; } 1137 1138 // Thread chain operations 1139 JavaThread* next() const { return _next; } 1140 void set_next(JavaThread* p) { _next = p; } 1141 1142 // Thread oop. threadObj() can be NULL for initial JavaThread 1143 // (or for threads attached via JNI) 1144 oop threadObj() const { return _threadObj; } 1145 void set_threadObj(oop p) { _threadObj = p; } 1146 1147 ThreadPriority java_priority() const; // Read from threadObj() 1148 1149 // Prepare thread and add to priority queue. If a priority is 1150 // not specified, use the priority of the thread object. Threads_lock 1151 // must be held while this function is called. 1152 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 1153 1154 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 1155 address saved_exception_pc() { return _saved_exception_pc; } 1156 1157 1158 ThreadFunction entry_point() const { return _entry_point; } 1159 1160 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1161 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS); 1162 1163 // Last frame anchor routines 1164 1165 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1166 1167 // last_Java_sp 1168 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1169 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1170 1171 // last_Java_pc 1172 1173 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1174 1175 // Safepoint support 1176 #if !(defined(PPC64) || defined(AARCH64)) 1177 JavaThreadState thread_state() const { return _thread_state; } 1178 void set_thread_state(JavaThreadState s) { _thread_state = s; } 1179 #else 1180 // Use membars when accessing volatile _thread_state. See 1181 // Threads::create_vm() for size checks. 1182 inline JavaThreadState thread_state() const; 1183 inline void set_thread_state(JavaThreadState s); 1184 #endif 1185 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } 1186 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } 1187 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } 1188 1189 // JavaThread termination and lifecycle support: 1190 void smr_delete(); 1191 bool on_thread_list() const { return _on_thread_list; } 1192 void set_on_thread_list() { _on_thread_list = true; } 1193 1194 // thread has called JavaThread::exit() or is terminated 1195 bool is_exiting() const; 1196 // thread is terminated (no longer on the threads list); we compare 1197 // against the two non-terminated values so that a freed JavaThread 1198 // will also be considered terminated. 1199 bool check_is_terminated(TerminatedTypes l_terminated) const { 1200 return l_terminated != _not_terminated && l_terminated != _thread_exiting; 1201 } 1202 bool is_terminated() const; 1203 void set_terminated(TerminatedTypes t); 1204 // special for Threads::remove() which is static: 1205 void set_terminated_value(); 1206 void block_if_vm_exited(); 1207 1208 bool doing_unsafe_access() { return _doing_unsafe_access; } 1209 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1210 1211 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1212 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1213 1214 inline void set_polling_page_release(void* poll_value); 1215 inline void set_polling_page(void* poll_value); 1216 inline volatile void* get_polling_page(); 1217 1218 private: 1219 // Support for thread handshake operations 1220 HandshakeState _handshake; 1221 public: 1222 void set_handshake_operation(HandshakeOperation* op) { 1223 _handshake.set_operation(this, op); 1224 } 1225 1226 bool has_handshake() const { 1227 return _handshake.has_operation(); 1228 } 1229 1230 void cancel_handshake() { 1231 _handshake.cancel(this); 1232 } 1233 1234 void handshake_process_by_self() { 1235 _handshake.process_by_self(this); 1236 } 1237 1238 void handshake_process_by_vmthread() { 1239 _handshake.process_by_vmthread(this); 1240 } 1241 1242 // Suspend/resume support for JavaThread 1243 private: 1244 inline void set_ext_suspended(); 1245 inline void clear_ext_suspended(); 1246 1247 public: 1248 void java_suspend(); 1249 void java_resume(); 1250 int java_suspend_self(); 1251 1252 void check_and_wait_while_suspended() { 1253 assert(JavaThread::current() == this, "sanity check"); 1254 1255 bool do_self_suspend; 1256 do { 1257 // were we externally suspended while we were waiting? 1258 do_self_suspend = handle_special_suspend_equivalent_condition(); 1259 if (do_self_suspend) { 1260 // don't surprise the thread that suspended us by returning 1261 java_suspend_self(); 1262 set_suspend_equivalent(); 1263 } 1264 } while (do_self_suspend); 1265 } 1266 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); 1267 // Check for async exception in addition to safepoint and suspend request. 1268 static void check_special_condition_for_native_trans(JavaThread *thread); 1269 1270 // Same as check_special_condition_for_native_trans but finishes the 1271 // transition into thread_in_Java mode so that it can potentially 1272 // block. 1273 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); 1274 1275 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); 1276 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { 1277 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1278 // Warning: is_ext_suspend_completed() may temporarily drop the 1279 // SR_lock to allow the thread to reach a stable thread state if 1280 // it is currently in a transient thread state. 1281 return is_ext_suspend_completed(false /* !called_by_wait */, 1282 SuspendRetryDelay, bits); 1283 } 1284 1285 // We cannot allow wait_for_ext_suspend_completion() to run forever or 1286 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally 1287 // passed as the count and delay parameters. Experiments with specific 1288 // calls to wait_for_ext_suspend_completion() can be done by passing 1289 // other values in the code. Experiments with all calls can be done 1290 // via the appropriate -XX options. 1291 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); 1292 1293 // test for suspend - most (all?) of these should go away 1294 bool is_thread_fully_suspended(bool wait_for_suspend, uint32_t *bits); 1295 1296 inline void set_external_suspend(); 1297 inline void clear_external_suspend(); 1298 1299 inline void set_deopt_suspend(); 1300 inline void clear_deopt_suspend(); 1301 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } 1302 1303 bool is_external_suspend() const { 1304 return (_suspend_flags & _external_suspend) != 0; 1305 } 1306 // Whenever a thread transitions from native to vm/java it must suspend 1307 // if external|deopt suspend is present. 1308 bool is_suspend_after_native() const { 1309 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0; 1310 } 1311 1312 // external suspend request is completed 1313 bool is_ext_suspended() const { 1314 return (_suspend_flags & _ext_suspended) != 0; 1315 } 1316 1317 bool is_external_suspend_with_lock() const { 1318 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1319 return is_external_suspend(); 1320 } 1321 1322 // Special method to handle a pending external suspend request 1323 // when a suspend equivalent condition lifts. 1324 bool handle_special_suspend_equivalent_condition() { 1325 assert(is_suspend_equivalent(), 1326 "should only be called in a suspend equivalence condition"); 1327 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1328 bool ret = is_external_suspend(); 1329 if (!ret) { 1330 // not about to self-suspend so clear suspend equivalence 1331 clear_suspend_equivalent(); 1332 } 1333 // implied else: 1334 // We have a pending external suspend request so we leave the 1335 // suspend_equivalent flag set until java_suspend_self() sets 1336 // the ext_suspended flag and clears the suspend_equivalent 1337 // flag. This insures that wait_for_ext_suspend_completion() 1338 // will return consistent values. 1339 return ret; 1340 } 1341 1342 // utility methods to see if we are doing some kind of suspension 1343 bool is_being_ext_suspended() const { 1344 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1345 return is_ext_suspended() || is_external_suspend(); 1346 } 1347 1348 bool is_suspend_equivalent() const { return _suspend_equivalent; } 1349 1350 void set_suspend_equivalent() { _suspend_equivalent = true; } 1351 void clear_suspend_equivalent() { _suspend_equivalent = false; } 1352 1353 // Thread.stop support 1354 void send_thread_stop(oop throwable); 1355 AsyncRequests clear_special_runtime_exit_condition() { 1356 AsyncRequests x = _special_runtime_exit_condition; 1357 _special_runtime_exit_condition = _no_async_condition; 1358 return x; 1359 } 1360 1361 // Are any async conditions present? 1362 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } 1363 1364 void check_and_handle_async_exceptions(bool check_unsafe_error = true); 1365 1366 // these next two are also used for self-suspension and async exception support 1367 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1368 1369 // Return true if JavaThread has an asynchronous condition or 1370 // if external suspension is requested. 1371 bool has_special_runtime_exit_condition() { 1372 // Because we don't use is_external_suspend_with_lock 1373 // it is possible that we won't see an asynchronous external suspend 1374 // request that has just gotten started, i.e., SR_lock grabbed but 1375 // _external_suspend field change either not made yet or not visible 1376 // yet. However, this is okay because the request is asynchronous and 1377 // we will see the new flag value the next time through. It's also 1378 // possible that the external suspend request is dropped after 1379 // we have checked is_external_suspend(), we will recheck its value 1380 // under SR_lock in java_suspend_self(). 1381 return (_special_runtime_exit_condition != _no_async_condition) || 1382 is_external_suspend() || is_trace_suspend(); 1383 } 1384 1385 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } 1386 1387 inline void set_pending_async_exception(oop e); 1388 1389 // Fast-locking support 1390 bool is_lock_owned(address adr) const; 1391 1392 // Accessors for vframe array top 1393 // The linked list of vframe arrays are sorted on sp. This means when we 1394 // unpack the head must contain the vframe array to unpack. 1395 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1396 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1397 1398 // Side structure for deferring update of java frame locals until deopt occurs 1399 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } 1400 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } 1401 1402 // These only really exist to make debugging deopt problems simpler 1403 1404 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1405 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1406 1407 // The special resourceMark used during deoptimization 1408 1409 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1410 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1411 1412 intptr_t* must_deopt_id() { return _must_deopt_id; } 1413 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } 1414 void clear_must_deopt_id() { _must_deopt_id = NULL; } 1415 1416 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; } 1417 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; } 1418 1419 Method* callee_target() const { return _callee_target; } 1420 void set_callee_target (Method* x) { _callee_target = x; } 1421 1422 // Oop results of vm runtime calls 1423 oop vm_result() const { return _vm_result; } 1424 void set_vm_result (oop x) { _vm_result = x; } 1425 1426 Metadata* vm_result_2() const { return _vm_result_2; } 1427 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1428 1429 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1430 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1431 1432 #if INCLUDE_JVMCI 1433 int pending_deoptimization() const { return _pending_deoptimization; } 1434 long pending_failed_speculation() const { return _pending_failed_speculation; } 1435 bool adjusting_comp_level() const { return _adjusting_comp_level; } 1436 void set_adjusting_comp_level(bool b) { _adjusting_comp_level = b; } 1437 bool has_pending_monitorenter() const { return _pending_monitorenter; } 1438 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } 1439 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } 1440 void set_pending_failed_speculation(long failed_speculation) { _pending_failed_speculation = failed_speculation; } 1441 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } 1442 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; } 1443 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; } 1444 #endif // INCLUDE_JVMCI 1445 1446 // Exception handling for compiled methods 1447 oop exception_oop() const { return _exception_oop; } 1448 address exception_pc() const { return _exception_pc; } 1449 address exception_handler_pc() const { return _exception_handler_pc; } 1450 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1451 1452 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); } 1453 void set_exception_pc(address a) { _exception_pc = a; } 1454 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1455 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1456 1457 void clear_exception_oop_and_pc() { 1458 set_exception_oop(NULL); 1459 set_exception_pc(NULL); 1460 } 1461 1462 // Stack overflow support 1463 // 1464 // (small addresses) 1465 // 1466 // -- <-- stack_end() --- 1467 // | | 1468 // | red pages | 1469 // | | 1470 // -- <-- stack_red_zone_base() | 1471 // | | 1472 // | guard 1473 // | yellow pages zone 1474 // | | 1475 // | | 1476 // -- <-- stack_yellow_zone_base() | 1477 // | | 1478 // | | 1479 // | reserved pages | 1480 // | | 1481 // -- <-- stack_reserved_zone_base() --- --- 1482 // /|\ shadow <-- stack_overflow_limit() (somewhere in here) 1483 // | zone 1484 // \|/ size 1485 // some untouched memory --- 1486 // 1487 // 1488 // -- 1489 // | 1490 // | shadow zone 1491 // | 1492 // -- 1493 // x frame n 1494 // -- 1495 // x frame n-1 1496 // x 1497 // -- 1498 // ... 1499 // 1500 // -- 1501 // x frame 0 1502 // -- <-- stack_base() 1503 // 1504 // (large addresses) 1505 // 1506 1507 private: 1508 // These values are derived from flags StackRedPages, StackYellowPages, 1509 // StackReservedPages and StackShadowPages. The zone size is determined 1510 // ergonomically if page_size > 4K. 1511 static size_t _stack_red_zone_size; 1512 static size_t _stack_yellow_zone_size; 1513 static size_t _stack_reserved_zone_size; 1514 static size_t _stack_shadow_zone_size; 1515 public: 1516 inline size_t stack_available(address cur_sp); 1517 1518 static size_t stack_red_zone_size() { 1519 assert(_stack_red_zone_size > 0, "Don't call this before the field is initialized."); 1520 return _stack_red_zone_size; 1521 } 1522 static void set_stack_red_zone_size(size_t s) { 1523 assert(is_aligned(s, os::vm_page_size()), 1524 "We can not protect if the red zone size is not page aligned."); 1525 assert(_stack_red_zone_size == 0, "This should be called only once."); 1526 _stack_red_zone_size = s; 1527 } 1528 address stack_red_zone_base() { 1529 return (address)(stack_end() + stack_red_zone_size()); 1530 } 1531 bool in_stack_red_zone(address a) { 1532 return a <= stack_red_zone_base() && a >= stack_end(); 1533 } 1534 1535 static size_t stack_yellow_zone_size() { 1536 assert(_stack_yellow_zone_size > 0, "Don't call this before the field is initialized."); 1537 return _stack_yellow_zone_size; 1538 } 1539 static void set_stack_yellow_zone_size(size_t s) { 1540 assert(is_aligned(s, os::vm_page_size()), 1541 "We can not protect if the yellow zone size is not page aligned."); 1542 assert(_stack_yellow_zone_size == 0, "This should be called only once."); 1543 _stack_yellow_zone_size = s; 1544 } 1545 1546 static size_t stack_reserved_zone_size() { 1547 // _stack_reserved_zone_size may be 0. This indicates the feature is off. 1548 return _stack_reserved_zone_size; 1549 } 1550 static void set_stack_reserved_zone_size(size_t s) { 1551 assert(is_aligned(s, os::vm_page_size()), 1552 "We can not protect if the reserved zone size is not page aligned."); 1553 assert(_stack_reserved_zone_size == 0, "This should be called only once."); 1554 _stack_reserved_zone_size = s; 1555 } 1556 address stack_reserved_zone_base() { 1557 return (address)(stack_end() + 1558 (stack_red_zone_size() + stack_yellow_zone_size() + stack_reserved_zone_size())); 1559 } 1560 bool in_stack_reserved_zone(address a) { 1561 return (a <= stack_reserved_zone_base()) && 1562 (a >= (address)((intptr_t)stack_reserved_zone_base() - stack_reserved_zone_size())); 1563 } 1564 1565 static size_t stack_yellow_reserved_zone_size() { 1566 return _stack_yellow_zone_size + _stack_reserved_zone_size; 1567 } 1568 bool in_stack_yellow_reserved_zone(address a) { 1569 return (a <= stack_reserved_zone_base()) && (a >= stack_red_zone_base()); 1570 } 1571 1572 // Size of red + yellow + reserved zones. 1573 static size_t stack_guard_zone_size() { 1574 return stack_red_zone_size() + stack_yellow_reserved_zone_size(); 1575 } 1576 1577 static size_t stack_shadow_zone_size() { 1578 assert(_stack_shadow_zone_size > 0, "Don't call this before the field is initialized."); 1579 return _stack_shadow_zone_size; 1580 } 1581 static void set_stack_shadow_zone_size(size_t s) { 1582 // The shadow area is not allocated or protected, so 1583 // it needs not be page aligned. 1584 // But the stack bang currently assumes that it is a 1585 // multiple of page size. This guarantees that the bang 1586 // loop touches all pages in the shadow zone. 1587 // This can be guaranteed differently, as well. E.g., if 1588 // the page size is a multiple of 4K, banging in 4K steps 1589 // suffices to touch all pages. (Some pages are banged 1590 // several times, though.) 1591 assert(is_aligned(s, os::vm_page_size()), 1592 "Stack bang assumes multiple of page size."); 1593 assert(_stack_shadow_zone_size == 0, "This should be called only once."); 1594 _stack_shadow_zone_size = s; 1595 } 1596 1597 void create_stack_guard_pages(); 1598 void remove_stack_guard_pages(); 1599 1600 void enable_stack_reserved_zone(); 1601 void disable_stack_reserved_zone(); 1602 void enable_stack_yellow_reserved_zone(); 1603 void disable_stack_yellow_reserved_zone(); 1604 void enable_stack_red_zone(); 1605 void disable_stack_red_zone(); 1606 1607 inline bool stack_guard_zone_unused(); 1608 inline bool stack_yellow_reserved_zone_disabled(); 1609 inline bool stack_reserved_zone_disabled(); 1610 inline bool stack_guards_enabled(); 1611 1612 address reserved_stack_activation() const { return _reserved_stack_activation; } 1613 void set_reserved_stack_activation(address addr) { 1614 assert(_reserved_stack_activation == stack_base() 1615 || _reserved_stack_activation == NULL 1616 || addr == stack_base(), "Must not be set twice"); 1617 _reserved_stack_activation = addr; 1618 } 1619 1620 // Attempt to reguard the stack after a stack overflow may have occurred. 1621 // Returns true if (a) guard pages are not needed on this thread, (b) the 1622 // pages are already guarded, or (c) the pages were successfully reguarded. 1623 // Returns false if there is not enough stack space to reguard the pages, in 1624 // which case the caller should unwind a frame and try again. The argument 1625 // should be the caller's (approximate) sp. 1626 bool reguard_stack(address cur_sp); 1627 // Similar to above but see if current stackpoint is out of the guard area 1628 // and reguard if possible. 1629 bool reguard_stack(void); 1630 1631 address stack_overflow_limit() { return _stack_overflow_limit; } 1632 void set_stack_overflow_limit() { 1633 _stack_overflow_limit = 1634 stack_end() + MAX2(JavaThread::stack_guard_zone_size(), JavaThread::stack_shadow_zone_size()); 1635 } 1636 1637 // Misc. accessors/mutators 1638 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1639 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1640 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1641 1642 #ifndef PRODUCT 1643 void record_jump(address target, address instr, const char* file, int line); 1644 #endif // PRODUCT 1645 1646 // For assembly stub generation 1647 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } 1648 #ifndef PRODUCT 1649 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); } 1650 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); } 1651 #endif // PRODUCT 1652 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } 1653 static ByteSize pending_jni_exception_check_fn_offset() { 1654 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn); 1655 } 1656 static ByteSize last_Java_sp_offset() { 1657 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1658 } 1659 static ByteSize last_Java_pc_offset() { 1660 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1661 } 1662 static ByteSize frame_anchor_offset() { 1663 return byte_offset_of(JavaThread, _anchor); 1664 } 1665 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } 1666 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } 1667 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } 1668 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } 1669 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } 1670 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } 1671 #if INCLUDE_JVMCI 1672 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); } 1673 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); } 1674 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); } 1675 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); } 1676 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); } 1677 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); } 1678 #endif // INCLUDE_JVMCI 1679 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } 1680 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } 1681 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1682 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } 1683 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1684 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); } 1685 static ByteSize reserved_stack_activation_offset() { return byte_offset_of(JavaThread, _reserved_stack_activation); } 1686 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } 1687 1688 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1689 static ByteSize should_post_on_exceptions_flag_offset() { 1690 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1691 } 1692 1693 // Returns the jni environment for this thread 1694 JNIEnv* jni_environment() { return &_jni_environment; } 1695 1696 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1697 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1698 // Only return NULL if thread is off the thread list; starting to 1699 // exit should not return NULL. 1700 if (thread_from_jni_env->is_terminated()) { 1701 thread_from_jni_env->block_if_vm_exited(); 1702 return NULL; 1703 } else { 1704 return thread_from_jni_env; 1705 } 1706 } 1707 1708 // JNI critical regions. These can nest. 1709 bool in_critical() { return _jni_active_critical > 0; } 1710 bool in_last_critical() { return _jni_active_critical == 1; } 1711 void enter_critical() { 1712 assert(Thread::current() == this || 1713 (Thread::current()->is_VM_thread() && 1714 SafepointSynchronize::is_synchronizing()), 1715 "this must be current thread or synchronizing"); 1716 _jni_active_critical++; 1717 } 1718 void exit_critical() { 1719 assert(Thread::current() == this, "this must be current thread"); 1720 _jni_active_critical--; 1721 assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); 1722 } 1723 1724 // Checked JNI: is the programmer required to check for exceptions, if so specify 1725 // which function name. Returning to a Java frame should implicitly clear the 1726 // pending check, this is done for Native->Java transitions (i.e. user JNI code). 1727 // VM->Java transistions are not cleared, it is expected that JNI code enclosed 1728 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal). 1729 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1730 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1731 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1732 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1733 1734 // For deadlock detection 1735 int depth_first_number() { return _depth_first_number; } 1736 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1737 1738 private: 1739 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1740 1741 public: 1742 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1743 void add_monitor_chunk(MonitorChunk* chunk); 1744 void remove_monitor_chunk(MonitorChunk* chunk); 1745 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1746 void inc_in_deopt_handler() { _in_deopt_handler++; } 1747 void dec_in_deopt_handler() { 1748 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1749 if (_in_deopt_handler > 0) { // robustness 1750 _in_deopt_handler--; 1751 } 1752 } 1753 1754 private: 1755 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1756 1757 public: 1758 1759 // Frame iteration; calls the function f for all frames on the stack 1760 void frames_do(void f(frame*, const RegisterMap*)); 1761 1762 // Memory operations 1763 void oops_do(OopClosure* f, CodeBlobClosure* cf); 1764 1765 // Sweeper operations 1766 virtual void nmethods_do(CodeBlobClosure* cf); 1767 1768 // RedefineClasses Support 1769 void metadata_do(void f(Metadata*)); 1770 1771 // Misc. operations 1772 char* name() const { return (char*)get_thread_name(); } 1773 void print_on(outputStream* st, bool print_extended_info) const; 1774 void print_on(outputStream* st) const { print_on(st, false); } 1775 void print_value(); 1776 void print_thread_state_on(outputStream*) const PRODUCT_RETURN; 1777 void print_thread_state() const PRODUCT_RETURN; 1778 void print_on_error(outputStream* st, char* buf, int buflen) const; 1779 void print_name_on_error(outputStream* st, char* buf, int buflen) const; 1780 void verify(); 1781 const char* get_thread_name() const; 1782 private: 1783 // factor out low-level mechanics for use in both normal and error cases 1784 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1785 public: 1786 const char* get_threadgroup_name() const; 1787 const char* get_parent_name() const; 1788 1789 // Accessing frames 1790 frame last_frame() { 1791 _anchor.make_walkable(this); 1792 return pd_last_frame(); 1793 } 1794 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1795 1796 // Returns method at 'depth' java or native frames down the stack 1797 // Used for security checks 1798 Klass* security_get_caller_class(int depth); 1799 1800 // Print stack trace in external format 1801 void print_stack_on(outputStream* st); 1802 void print_stack() { print_stack_on(tty); } 1803 1804 // Print stack traces in various internal formats 1805 void trace_stack() PRODUCT_RETURN; 1806 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1807 void trace_frames() PRODUCT_RETURN; 1808 void trace_oops() PRODUCT_RETURN; 1809 1810 // Print an annotated view of the stack frames 1811 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1812 void validate_frame_layout() { 1813 print_frame_layout(0, true); 1814 } 1815 1816 // Returns the number of stack frames on the stack 1817 int depth() const; 1818 1819 // Function for testing deoptimization 1820 void deoptimize(); 1821 void make_zombies(); 1822 1823 void deoptimized_wrt_marked_nmethods(); 1824 1825 public: 1826 // Returns the running thread as a JavaThread 1827 static inline JavaThread* current(); 1828 1829 // Returns the active Java thread. Do not use this if you know you are calling 1830 // from a JavaThread, as it's slower than JavaThread::current. If called from 1831 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1832 // operation. You may not want that either. 1833 static JavaThread* active(); 1834 1835 inline CompilerThread* as_CompilerThread(); 1836 1837 public: 1838 virtual void run(); 1839 void thread_main_inner(); 1840 1841 private: 1842 // PRIVILEGED STACK 1843 PrivilegedElement* _privileged_stack_top; 1844 GrowableArray<oop>* _array_for_gc; 1845 public: 1846 1847 // Returns the privileged_stack information. 1848 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } 1849 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } 1850 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } 1851 1852 public: 1853 // Thread local information maintained by JVMTI. 1854 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1855 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1856 // getter is used to get this JavaThread's JvmtiThreadState if it has 1857 // one which means NULL can be returned. JvmtiThreadState::state_for() 1858 // is used to get the specified JavaThread's JvmtiThreadState if it has 1859 // one or it allocates a new JvmtiThreadState for the JavaThread and 1860 // returns it. JvmtiThreadState::state_for() will return NULL only if 1861 // the specified JavaThread is exiting. 1862 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1863 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1864 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } 1865 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } 1866 1867 // JVMTI PopFrame support 1868 // Setting and clearing popframe_condition 1869 // All of these enumerated values are bits. popframe_pending 1870 // indicates that a PopFrame() has been requested and not yet been 1871 // completed. popframe_processing indicates that that PopFrame() is in 1872 // the process of being completed. popframe_force_deopt_reexecution_bit 1873 // indicates that special handling is required when returning to a 1874 // deoptimized caller. 1875 enum PopCondition { 1876 popframe_inactive = 0x00, 1877 popframe_pending_bit = 0x01, 1878 popframe_processing_bit = 0x02, 1879 popframe_force_deopt_reexecution_bit = 0x04 1880 }; 1881 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1882 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1883 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1884 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1885 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1886 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1887 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1888 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1889 #ifdef CC_INTERP 1890 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } 1891 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } 1892 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1893 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1894 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1895 #endif 1896 1897 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1898 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1899 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1900 1901 private: 1902 // Saved incoming arguments to popped frame. 1903 // Used only when popped interpreted frame returns to deoptimized frame. 1904 void* _popframe_preserved_args; 1905 int _popframe_preserved_args_size; 1906 1907 public: 1908 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1909 void* popframe_preserved_args(); 1910 ByteSize popframe_preserved_args_size(); 1911 WordSize popframe_preserved_args_size_in_words(); 1912 void popframe_free_preserved_args(); 1913 1914 1915 private: 1916 JvmtiThreadState *_jvmti_thread_state; 1917 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; 1918 1919 // Used by the interpreter in fullspeed mode for frame pop, method 1920 // entry, method exit and single stepping support. This field is 1921 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. 1922 // It can be set to zero asynchronously (i.e., without a VM operation 1923 // or a lock) so we have to be very careful. 1924 int _interp_only_mode; 1925 1926 public: 1927 // used by the interpreter for fullspeed debugging support (see above) 1928 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1929 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1930 int get_interp_only_mode() { return _interp_only_mode; } 1931 void increment_interp_only_mode() { ++_interp_only_mode; } 1932 void decrement_interp_only_mode() { --_interp_only_mode; } 1933 1934 // support for cached flag that indicates whether exceptions need to be posted for this thread 1935 // if this is false, we can avoid deoptimizing when events are thrown 1936 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1937 private: 1938 int _should_post_on_exceptions_flag; 1939 1940 public: 1941 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1942 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1943 1944 private: 1945 ThreadStatistics *_thread_stat; 1946 1947 public: 1948 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1949 1950 // Return a blocker object for which this thread is blocked parking. 1951 oop current_park_blocker(); 1952 1953 private: 1954 static size_t _stack_size_at_create; 1955 1956 public: 1957 static inline size_t stack_size_at_create(void) { 1958 return _stack_size_at_create; 1959 } 1960 static inline void set_stack_size_at_create(size_t value) { 1961 _stack_size_at_create = value; 1962 } 1963 1964 // Machine dependent stuff 1965 #include OS_CPU_HEADER(thread) 1966 1967 public: 1968 void set_blocked_on_compilation(bool value) { 1969 _blocked_on_compilation = value; 1970 } 1971 1972 bool blocked_on_compilation() { 1973 return _blocked_on_compilation; 1974 } 1975 protected: 1976 bool _blocked_on_compilation; 1977 1978 1979 // JSR166 per-thread parker 1980 private: 1981 Parker* _parker; 1982 public: 1983 Parker* parker() { return _parker; } 1984 1985 // Biased locking support 1986 private: 1987 GrowableArray<MonitorInfo*>* _cached_monitor_info; 1988 public: 1989 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 1990 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 1991 1992 // clearing/querying jni attach status 1993 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1994 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1995 inline void set_done_attaching_via_jni(); 1996 }; 1997 1998 // Inline implementation of JavaThread::current 1999 inline JavaThread* JavaThread::current() { 2000 Thread* thread = Thread::current(); 2001 assert(thread->is_Java_thread(), "just checking"); 2002 return (JavaThread*)thread; 2003 } 2004 2005 inline CompilerThread* JavaThread::as_CompilerThread() { 2006 assert(is_Compiler_thread(), "just checking"); 2007 return (CompilerThread*)this; 2008 } 2009 2010 // Dedicated thread to sweep the code cache 2011 class CodeCacheSweeperThread : public JavaThread { 2012 CompiledMethod* _scanned_compiled_method; // nmethod being scanned by the sweeper 2013 public: 2014 CodeCacheSweeperThread(); 2015 // Track the nmethod currently being scanned by the sweeper 2016 void set_scanned_compiled_method(CompiledMethod* cm) { 2017 assert(_scanned_compiled_method == NULL || cm == NULL, "should reset to NULL before writing a new value"); 2018 _scanned_compiled_method = cm; 2019 } 2020 2021 // Hide sweeper thread from external view. 2022 bool is_hidden_from_external_view() const { return true; } 2023 2024 bool is_Code_cache_sweeper_thread() const { return true; } 2025 2026 // Prevent GC from unloading _scanned_compiled_method 2027 void oops_do(OopClosure* f, CodeBlobClosure* cf); 2028 void nmethods_do(CodeBlobClosure* cf); 2029 }; 2030 2031 // A thread used for Compilation. 2032 class CompilerThread : public JavaThread { 2033 friend class VMStructs; 2034 private: 2035 CompilerCounters* _counters; 2036 2037 ciEnv* _env; 2038 CompileLog* _log; 2039 CompileTask* volatile _task; // print_threads_compiling can read this concurrently. 2040 CompileQueue* _queue; 2041 BufferBlob* _buffer_blob; 2042 2043 AbstractCompiler* _compiler; 2044 TimeStamp _idle_time; 2045 2046 public: 2047 2048 static CompilerThread* current(); 2049 2050 CompilerThread(CompileQueue* queue, CompilerCounters* counters); 2051 ~CompilerThread(); 2052 2053 bool is_Compiler_thread() const { return true; } 2054 2055 virtual bool can_call_java() const; 2056 2057 // Hide native compiler threads from external view. 2058 bool is_hidden_from_external_view() const { return !can_call_java(); } 2059 2060 void set_compiler(AbstractCompiler* c) { _compiler = c; } 2061 AbstractCompiler* compiler() const { return _compiler; } 2062 2063 CompileQueue* queue() const { return _queue; } 2064 CompilerCounters* counters() const { return _counters; } 2065 2066 // Get/set the thread's compilation environment. 2067 ciEnv* env() { return _env; } 2068 void set_env(ciEnv* env) { _env = env; } 2069 2070 BufferBlob* get_buffer_blob() const { return _buffer_blob; } 2071 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; } 2072 2073 // Get/set the thread's logging information 2074 CompileLog* log() { return _log; } 2075 void init_log(CompileLog* log) { 2076 // Set once, for good. 2077 assert(_log == NULL, "set only once"); 2078 _log = log; 2079 } 2080 2081 void start_idle_timer() { _idle_time.update(); } 2082 jlong idle_time_millis() { 2083 return TimeHelper::counter_to_millis(_idle_time.ticks_since_update()); 2084 } 2085 2086 #ifndef PRODUCT 2087 private: 2088 IdealGraphPrinter *_ideal_graph_printer; 2089 public: 2090 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } 2091 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } 2092 #endif 2093 2094 // Get/set the thread's current task 2095 CompileTask* task() { return _task; } 2096 void set_task(CompileTask* task) { _task = task; } 2097 }; 2098 2099 inline CompilerThread* CompilerThread::current() { 2100 return JavaThread::current()->as_CompilerThread(); 2101 } 2102 2103 // The active thread queue. It also keeps track of the current used 2104 // thread priorities. 2105 class Threads: AllStatic { 2106 friend class VMStructs; 2107 private: 2108 static JavaThread* _thread_list; 2109 static int _number_of_threads; 2110 static int _number_of_non_daemon_threads; 2111 static int _return_code; 2112 static int _thread_claim_parity; 2113 #ifdef ASSERT 2114 static bool _vm_complete; 2115 #endif 2116 2117 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS); 2118 static void initialize_jsr292_core_classes(TRAPS); 2119 2120 public: 2121 // Thread management 2122 // force_daemon is a concession to JNI, where we may need to add a 2123 // thread to the thread list before allocating its thread object 2124 static void add(JavaThread* p, bool force_daemon = false); 2125 static void remove(JavaThread* p); 2126 static void non_java_threads_do(ThreadClosure* tc); 2127 static void java_threads_do(ThreadClosure* tc); 2128 static void java_threads_and_vm_thread_do(ThreadClosure* tc); 2129 static void threads_do(ThreadClosure* tc); 2130 static void possibly_parallel_threads_do(bool is_par, ThreadClosure* tc); 2131 2132 // Initializes the vm and creates the vm thread 2133 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 2134 static void convert_vm_init_libraries_to_agents(); 2135 static void create_vm_init_libraries(); 2136 static void create_vm_init_agents(); 2137 static void shutdown_vm_agents(); 2138 static bool destroy_vm(); 2139 // Supported VM versions via JNI 2140 // Includes JNI_VERSION_1_1 2141 static jboolean is_supported_jni_version_including_1_1(jint version); 2142 // Does not include JNI_VERSION_1_1 2143 static jboolean is_supported_jni_version(jint version); 2144 2145 // The "thread claim parity" provides a way for threads to be claimed 2146 // by parallel worker tasks. 2147 // 2148 // Each thread contains a a "parity" field. A task will claim the 2149 // thread only if its parity field is the same as the global parity, 2150 // which is updated by calling change_thread_claim_parity(). 2151 // 2152 // For this to work change_thread_claim_parity() needs to be called 2153 // exactly once in sequential code before starting parallel tasks 2154 // that should claim threads. 2155 // 2156 // New threads get their parity set to 0 and change_thread_claim_parity() 2157 // never set the global parity to 0. 2158 static int thread_claim_parity() { return _thread_claim_parity; } 2159 static void change_thread_claim_parity(); 2160 static void assert_all_threads_claimed() NOT_DEBUG_RETURN; 2161 2162 // Apply "f->do_oop" to all root oops in all threads. 2163 // This version may only be called by sequential code. 2164 static void oops_do(OopClosure* f, CodeBlobClosure* cf); 2165 // This version may be called by sequential or parallel code. 2166 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf); 2167 2168 // Apply "f->do_oop" to roots in all threads that 2169 // are part of compiled frames 2170 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); 2171 2172 static void convert_hcode_pointers(); 2173 static void restore_hcode_pointers(); 2174 2175 // Sweeper 2176 static void nmethods_do(CodeBlobClosure* cf); 2177 2178 // RedefineClasses support 2179 static void metadata_do(void f(Metadata*)); 2180 static void metadata_handles_do(void f(Metadata*)); 2181 2182 #ifdef ASSERT 2183 static bool is_vm_complete() { return _vm_complete; } 2184 #endif 2185 2186 // Verification 2187 static void verify(); 2188 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks, bool print_extended_info); 2189 static void print(bool print_stacks, bool internal_format) { 2190 // this function is only used by debug.cpp 2191 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */, false /* simple format */); 2192 } 2193 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 2194 static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf, 2195 int buflen, bool* found_current); 2196 static void print_threads_compiling(outputStream* st, char* buf, int buflen); 2197 2198 // Get Java threads that are waiting to enter a monitor. 2199 static GrowableArray<JavaThread*>* get_pending_threads(ThreadsList * t_list, 2200 int count, address monitor); 2201 2202 // Get owning Java thread from the monitor's owner field. 2203 static JavaThread *owning_thread_from_monitor_owner(ThreadsList * t_list, 2204 address owner); 2205 2206 // Number of threads on the active threads list 2207 static int number_of_threads() { return _number_of_threads; } 2208 // Number of non-daemon threads on the active threads list 2209 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 2210 2211 // Deoptimizes all frames tied to marked nmethods 2212 static void deoptimized_wrt_marked_nmethods(); 2213 }; 2214 2215 2216 // Thread iterator 2217 class ThreadClosure: public StackObj { 2218 public: 2219 virtual void do_thread(Thread* thread) = 0; 2220 }; 2221 2222 class SignalHandlerMark: public StackObj { 2223 private: 2224 Thread* _thread; 2225 public: 2226 SignalHandlerMark(Thread* t) { 2227 _thread = t; 2228 if (_thread) _thread->enter_signal_handler(); 2229 } 2230 ~SignalHandlerMark() { 2231 if (_thread) _thread->leave_signal_handler(); 2232 _thread = NULL; 2233 } 2234 }; 2235 2236 2237 #endif // SHARE_VM_RUNTIME_THREAD_HPP