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 60 class SafeThreadsListPtr; 61 class ThreadSafepointState; 62 class ThreadsList; 63 class ThreadsSMRSupport; 64 65 class JvmtiThreadState; 66 class ThreadStatistics; 67 class ConcurrentLocksDump; 68 class ParkEvent; 69 class Parker; 70 71 class ciEnv; 72 class CompileThread; 73 class CompileLog; 74 class CompileTask; 75 class CompileQueue; 76 class CompilerCounters; 77 class vframeArray; 78 79 class DeoptResourceMark; 80 class jvmtiDeferredLocalVariableSet; 81 82 class GCTaskQueue; 83 class ThreadClosure; 84 class IdealGraphPrinter; 85 86 class Metadata; 87 template <class T, MEMFLAGS F> class ChunkedList; 88 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer; 89 90 DEBUG_ONLY(class ResourceMark;) 91 92 class WorkerThread; 93 94 // Class hierarchy 95 // - Thread 96 // - JavaThread 97 // - various subclasses eg CompilerThread, ServiceThread 98 // - NonJavaThread 99 // - NamedThread 100 // - VMThread 101 // - ConcurrentGCThread 102 // - WorkerThread 103 // - GangWorker 104 // - GCTaskThread 105 // - WatcherThread 106 // - JfrThreadSampler 107 // 108 // All Thread subclasses must be either JavaThread or NonJavaThread. 109 // This means !t->is_Java_thread() iff t is a NonJavaThread, or t is 110 // a partially constructed/destroyed Thread. 111 112 class Thread: public ThreadShadow { 113 friend class VMStructs; 114 friend class JVMCIVMStructs; 115 private: 116 117 #ifndef USE_LIBRARY_BASED_TLS_ONLY 118 // Current thread is maintained as a thread-local variable 119 static THREAD_LOCAL_DECL Thread* _thr_current; 120 #endif 121 122 private: 123 // Thread local data area available to the GC. The internal 124 // structure and contents of this data area is GC-specific. 125 // Only GC and GC barrier code should access this data area. 126 GCThreadLocalData _gc_data; 127 128 public: 129 static ByteSize gc_data_offset() { 130 return byte_offset_of(Thread, _gc_data); 131 } 132 133 template <typename T> T* gc_data() { 134 STATIC_ASSERT(sizeof(T) <= sizeof(_gc_data)); 135 return reinterpret_cast<T*>(&_gc_data); 136 } 137 138 // Exception handling 139 // (Note: _pending_exception and friends are in ThreadShadow) 140 //oop _pending_exception; // pending exception for current thread 141 // const char* _exception_file; // file information for exception (debugging only) 142 // int _exception_line; // line information for exception (debugging only) 143 protected: 144 // Support for forcing alignment of thread objects for biased locking 145 void* _real_malloc_address; 146 147 // JavaThread lifecycle support: 148 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 149 friend class ScanHazardPtrGatherProtectedThreadsClosure; // for cmpxchg_threads_hazard_ptr(), get_threads_hazard_ptr(), is_hazard_ptr_tagged() access 150 friend class ScanHazardPtrGatherThreadsListClosure; // for get_threads_hazard_ptr(), untag_hazard_ptr() access 151 friend class ScanHazardPtrPrintMatchingThreadsClosure; // for get_threads_hazard_ptr(), is_hazard_ptr_tagged() access 152 friend class ThreadsSMRSupport; // for _nested_threads_hazard_ptr_cnt, _threads_hazard_ptr, _threads_list_ptr access 153 154 ThreadsList* volatile _threads_hazard_ptr; 155 SafeThreadsListPtr* _threads_list_ptr; 156 ThreadsList* cmpxchg_threads_hazard_ptr(ThreadsList* exchange_value, ThreadsList* compare_value); 157 ThreadsList* get_threads_hazard_ptr(); 158 void set_threads_hazard_ptr(ThreadsList* new_list); 159 static bool is_hazard_ptr_tagged(ThreadsList* list) { 160 return (intptr_t(list) & intptr_t(1)) == intptr_t(1); 161 } 162 static ThreadsList* tag_hazard_ptr(ThreadsList* list) { 163 return (ThreadsList*)(intptr_t(list) | intptr_t(1)); 164 } 165 static ThreadsList* untag_hazard_ptr(ThreadsList* list) { 166 return (ThreadsList*)(intptr_t(list) & ~intptr_t(1)); 167 } 168 // This field is enabled via -XX:+EnableThreadSMRStatistics: 169 uint _nested_threads_hazard_ptr_cnt; 170 void dec_nested_threads_hazard_ptr_cnt() { 171 assert(_nested_threads_hazard_ptr_cnt != 0, "mismatched {dec,inc}_nested_threads_hazard_ptr_cnt()"); 172 _nested_threads_hazard_ptr_cnt--; 173 } 174 void inc_nested_threads_hazard_ptr_cnt() { 175 _nested_threads_hazard_ptr_cnt++; 176 } 177 uint nested_threads_hazard_ptr_cnt() { 178 return _nested_threads_hazard_ptr_cnt; 179 } 180 181 public: 182 void* operator new(size_t size) throw() { return allocate(size, true); } 183 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 184 return allocate(size, false); } 185 void operator delete(void* p); 186 187 protected: 188 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 189 private: 190 191 // *************************************************************** 192 // Suspend and resume support 193 // *************************************************************** 194 // 195 // VM suspend/resume no longer exists - it was once used for various 196 // things including safepoints but was deprecated and finally removed 197 // in Java 7. Because VM suspension was considered "internal" Java-level 198 // suspension was considered "external", and this legacy naming scheme 199 // remains. 200 // 201 // External suspend/resume requests come from JVM_SuspendThread, 202 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI 203 // ResumeThread. External 204 // suspend requests cause _external_suspend to be set and external 205 // resume requests cause _external_suspend to be cleared. 206 // External suspend requests do not nest on top of other external 207 // suspend requests. The higher level APIs reject suspend requests 208 // for already suspended threads. 209 // 210 // The external_suspend 211 // flag is checked by has_special_runtime_exit_condition() and java thread 212 // will self-suspend when handle_special_runtime_exit_condition() is 213 // called. Most uses of the _thread_blocked state in JavaThreads are 214 // considered the same as being externally suspended; if the blocking 215 // condition lifts, the JavaThread will self-suspend. Other places 216 // where VM checks for external_suspend include: 217 // + mutex granting (do not enter monitors when thread is suspended) 218 // + state transitions from _thread_in_native 219 // 220 // In general, java_suspend() does not wait for an external suspend 221 // request to complete. When it returns, the only guarantee is that 222 // the _external_suspend field is true. 223 // 224 // wait_for_ext_suspend_completion() is used to wait for an external 225 // suspend request to complete. External suspend requests are usually 226 // followed by some other interface call that requires the thread to 227 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into 228 // the interface that requires quiescence, we give the JavaThread a 229 // chance to self-suspend before we need it to be quiescent. This 230 // improves overall suspend/query performance. 231 // 232 // _suspend_flags controls the behavior of java_ suspend/resume. 233 // It must be set under the protection of SR_lock. Read from the flag is 234 // OK without SR_lock as long as the value is only used as a hint. 235 // (e.g., check _external_suspend first without lock and then recheck 236 // inside SR_lock and finish the suspension) 237 // 238 // _suspend_flags is also overloaded for other "special conditions" so 239 // that a single check indicates whether any special action is needed 240 // eg. for async exceptions. 241 // ------------------------------------------------------------------- 242 // Notes: 243 // 1. The suspend/resume logic no longer uses ThreadState in OSThread 244 // but we still update its value to keep other part of the system (mainly 245 // JVMTI) happy. ThreadState is legacy code (see notes in 246 // osThread.hpp). 247 // 248 // 2. It would be more natural if set_external_suspend() is private and 249 // part of java_suspend(), but that probably would affect the suspend/query 250 // performance. Need more investigation on this. 251 252 // suspend/resume lock: used for self-suspend 253 Monitor* _SR_lock; 254 255 protected: 256 enum SuspendFlags { 257 // NOTE: avoid using the sign-bit as cc generates different test code 258 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 259 260 _external_suspend = 0x20000000U, // thread is asked to self suspend 261 _ext_suspended = 0x40000000U, // thread has self-suspended 262 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt 263 264 _has_async_exception = 0x00000001U, // there is a pending async exception 265 _critical_native_unlock = 0x00000002U, // Must call back to unlock JNI critical lock 266 267 _trace_flag = 0x00000004U // call tracing backend 268 }; 269 270 // various suspension related flags - atomically updated 271 // overloaded for async exception checking in check_special_condition_for_native_trans. 272 volatile uint32_t _suspend_flags; 273 274 private: 275 int _num_nested_signal; 276 277 DEBUG_ONLY(bool _suspendible_thread;) 278 279 public: 280 void enter_signal_handler() { _num_nested_signal++; } 281 void leave_signal_handler() { _num_nested_signal--; } 282 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } 283 284 // Determines if a heap allocation failure will be retried 285 // (e.g., by deoptimizing and re-executing in the interpreter). 286 // In this case, the failed allocation must raise 287 // Universe::out_of_memory_error_retry() and omit side effects 288 // such as JVMTI events and handling -XX:+HeapDumpOnOutOfMemoryError 289 // and -XX:OnOutOfMemoryError. 290 virtual bool in_retryable_allocation() const { return false; } 291 292 #ifdef ASSERT 293 void set_suspendible_thread() { 294 _suspendible_thread = true; 295 } 296 297 void clear_suspendible_thread() { 298 _suspendible_thread = false; 299 } 300 301 bool is_suspendible_thread() { return _suspendible_thread; } 302 #endif 303 304 private: 305 // Active_handles points to a block of handles 306 JNIHandleBlock* _active_handles; 307 308 // One-element thread local free list 309 JNIHandleBlock* _free_handle_block; 310 311 // Point to the last handle mark 312 HandleMark* _last_handle_mark; 313 314 // The parity of the last strong_roots iteration in which this thread was 315 // claimed as a task. 316 int _oops_do_parity; 317 318 // Support for GlobalCounter 319 private: 320 volatile uintx _rcu_counter; 321 public: 322 volatile uintx* get_rcu_counter() { 323 return &_rcu_counter; 324 } 325 326 public: 327 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 328 HandleMark* last_handle_mark() const { return _last_handle_mark; } 329 private: 330 331 // debug support for checking if code does allow safepoints or not 332 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on 333 // mutex, or blocking on an object synchronizer (Java locking). 334 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases 335 // If !allow_allocation(), then an assertion failure will happen during allocation 336 // (Hence, !allow_safepoint() => !allow_allocation()). 337 // 338 // The two classes NoSafepointVerifier and No_Allocation_Verifier are used to set these counters. 339 // 340 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen 341 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. 342 343 // Used by SkipGCALot class. 344 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 345 346 friend class NoAllocVerifier; 347 friend class NoSafepointVerifier; 348 friend class PauseNoSafepointVerifier; 349 friend class GCLocker; 350 351 volatile void* _polling_page; // Thread local polling page 352 353 ThreadLocalAllocBuffer _tlab; // Thread-local eden 354 jlong _allocated_bytes; // Cumulative number of bytes allocated on 355 // the Java heap 356 ThreadHeapSampler _heap_sampler; // For use when sampling the memory. 357 358 ThreadStatisticalInfo _statistical_info; // Statistics about the thread 359 360 JFR_ONLY(DEFINE_THREAD_LOCAL_FIELD_JFR;) // Thread-local data for jfr 361 362 int _vm_operation_started_count; // VM_Operation support 363 int _vm_operation_completed_count; // VM_Operation support 364 365 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread 366 // is waiting to lock 367 bool _current_pending_monitor_is_from_java; // locking is from Java code 368 369 // ObjectMonitor on which this thread called Object.wait() 370 ObjectMonitor* _current_waiting_monitor; 371 372 // Private thread-local objectmonitor list - a simple cache organized as a SLL. 373 public: 374 ObjectMonitor* omFreeList; 375 int omFreeCount; // length of omFreeList 376 int omFreeProvision; // reload chunk size 377 ObjectMonitor* omInUseList; // SLL to track monitors in circulation 378 int omInUseCount; // length of omInUseList 379 380 #ifdef ASSERT 381 private: 382 bool _visited_for_critical_count; 383 384 public: 385 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } 386 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } 387 #endif 388 389 public: 390 enum { 391 is_definitely_current_thread = true 392 }; 393 394 // Constructor 395 Thread(); 396 virtual ~Thread() = 0; // Thread is abstract. 397 398 // Manage Thread::current() 399 void initialize_thread_current(); 400 static void clear_thread_current(); // TLS cleanup needed before threads terminate 401 402 protected: 403 // To be implemented by children. 404 virtual void run() = 0; 405 406 public: 407 // invokes <ChildThreadClass>::run(), with common preparations and cleanups. 408 void call_run(); 409 410 // Testers 411 virtual bool is_VM_thread() const { return false; } 412 virtual bool is_Java_thread() const { return false; } 413 virtual bool is_Compiler_thread() const { return false; } 414 virtual bool is_Code_cache_sweeper_thread() const { return false; } 415 virtual bool is_hidden_from_external_view() const { return false; } 416 virtual bool is_jvmti_agent_thread() const { return false; } 417 // True iff the thread can perform GC operations at a safepoint. 418 // Generally will be true only of VM thread and parallel GC WorkGang 419 // threads. 420 virtual bool is_GC_task_thread() const { return false; } 421 virtual bool is_Watcher_thread() const { return false; } 422 virtual bool is_ConcurrentGC_thread() const { return false; } 423 virtual bool is_Named_thread() const { return false; } 424 virtual bool is_Worker_thread() const { return false; } 425 426 // Can this thread make Java upcalls 427 virtual bool can_call_java() const { return false; } 428 429 // Casts 430 virtual WorkerThread* as_Worker_thread() const { return NULL; } 431 432 virtual char* name() const { return (char*)"Unknown thread"; } 433 434 // Returns the current thread (ASSERTS if NULL) 435 static inline Thread* current(); 436 // Returns the current thread, or NULL if not attached 437 static inline Thread* current_or_null(); 438 // Returns the current thread, or NULL if not attached, and is 439 // safe for use from signal-handlers 440 static inline Thread* current_or_null_safe(); 441 442 // Common thread operations 443 #ifdef ASSERT 444 static void check_for_dangling_thread_pointer(Thread *thread); 445 #endif 446 static void set_priority(Thread* thread, ThreadPriority priority); 447 static ThreadPriority get_priority(const Thread* const thread); 448 static void start(Thread* thread); 449 static void interrupt(Thread* thr); 450 static bool is_interrupted(Thread* thr, bool clear_interrupted); 451 452 void set_native_thread_name(const char *name) { 453 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); 454 os::set_native_thread_name(name); 455 } 456 457 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } 458 Monitor* SR_lock() const { return _SR_lock; } 459 460 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } 461 462 inline void set_suspend_flag(SuspendFlags f); 463 inline void clear_suspend_flag(SuspendFlags f); 464 465 inline void set_has_async_exception(); 466 inline void clear_has_async_exception(); 467 468 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } 469 470 inline void set_critical_native_unlock(); 471 inline void clear_critical_native_unlock(); 472 473 inline void set_trace_flag(); 474 inline void clear_trace_flag(); 475 476 // Support for Unhandled Oop detection 477 // Add the field for both, fastdebug and debug, builds to keep 478 // Thread's fields layout the same. 479 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build. 480 #ifdef CHECK_UNHANDLED_OOPS 481 private: 482 UnhandledOops* _unhandled_oops; 483 #elif defined(ASSERT) 484 private: 485 void* _unhandled_oops; 486 #endif 487 #ifdef CHECK_UNHANDLED_OOPS 488 public: 489 UnhandledOops* unhandled_oops() { return _unhandled_oops; } 490 // Mark oop safe for gc. It may be stack allocated but won't move. 491 void allow_unhandled_oop(oop *op) { 492 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); 493 } 494 // Clear oops at safepoint so crashes point to unhandled oop violator 495 void clear_unhandled_oops() { 496 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); 497 } 498 #endif // CHECK_UNHANDLED_OOPS 499 500 public: 501 #ifndef PRODUCT 502 bool skip_gcalot() { return _skip_gcalot; } 503 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 504 #endif 505 506 // Installs a pending exception to be inserted later 507 static void send_async_exception(oop thread_oop, oop java_throwable); 508 509 // Resource area 510 ResourceArea* resource_area() const { return _resource_area; } 511 void set_resource_area(ResourceArea* area) { _resource_area = area; } 512 513 OSThread* osthread() const { return _osthread; } 514 void set_osthread(OSThread* thread) { _osthread = thread; } 515 516 // JNI handle support 517 JNIHandleBlock* active_handles() const { return _active_handles; } 518 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 519 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 520 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 521 522 // Internal handle support 523 HandleArea* handle_area() const { return _handle_area; } 524 void set_handle_area(HandleArea* area) { _handle_area = area; } 525 526 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 527 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 528 529 // Thread-Local Allocation Buffer (TLAB) support 530 ThreadLocalAllocBuffer& tlab() { return _tlab; } 531 void initialize_tlab() { 532 if (UseTLAB) { 533 tlab().initialize(); 534 } 535 } 536 537 jlong allocated_bytes() { return _allocated_bytes; } 538 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 539 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 540 inline jlong cooked_allocated_bytes(); 541 542 ThreadHeapSampler& heap_sampler() { return _heap_sampler; } 543 544 ThreadStatisticalInfo& statistical_info() { return _statistical_info; } 545 546 JFR_ONLY(DEFINE_THREAD_LOCAL_ACCESSOR_JFR;) 547 548 bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; } 549 550 // VM operation support 551 int vm_operation_ticket() { return ++_vm_operation_started_count; } 552 int vm_operation_completed_count() { return _vm_operation_completed_count; } 553 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } 554 555 // For tracking the heavyweight monitor the thread is pending on. 556 ObjectMonitor* current_pending_monitor() { 557 return _current_pending_monitor; 558 } 559 void set_current_pending_monitor(ObjectMonitor* monitor) { 560 _current_pending_monitor = monitor; 561 } 562 void set_current_pending_monitor_is_from_java(bool from_java) { 563 _current_pending_monitor_is_from_java = from_java; 564 } 565 bool current_pending_monitor_is_from_java() { 566 return _current_pending_monitor_is_from_java; 567 } 568 569 // For tracking the ObjectMonitor on which this thread called Object.wait() 570 ObjectMonitor* current_waiting_monitor() { 571 return _current_waiting_monitor; 572 } 573 void set_current_waiting_monitor(ObjectMonitor* monitor) { 574 _current_waiting_monitor = monitor; 575 } 576 577 // GC support 578 // Apply "f->do_oop" to all root oops in "this". 579 // Used by JavaThread::oops_do. 580 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 581 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf); 582 583 // Handles the parallel case for the method below. 584 private: 585 bool claim_oops_do_par_case(int collection_parity); 586 public: 587 // Requires that "collection_parity" is that of the current roots 588 // iteration. If "is_par" is false, sets the parity of "this" to 589 // "collection_parity", and returns "true". If "is_par" is true, 590 // uses an atomic instruction to set the current threads parity to 591 // "collection_parity", if it is not already. Returns "true" iff the 592 // calling thread does the update, this indicates that the calling thread 593 // has claimed the thread's stack as a root groop in the current 594 // collection. 595 bool claim_oops_do(bool is_par, int collection_parity) { 596 if (!is_par) { 597 _oops_do_parity = collection_parity; 598 return true; 599 } else { 600 return claim_oops_do_par_case(collection_parity); 601 } 602 } 603 604 // jvmtiRedefineClasses support 605 void metadata_handles_do(void f(Metadata*)); 606 607 // Used by fast lock support 608 virtual bool is_lock_owned(address adr) const; 609 610 // Check if address is in the stack of the thread (not just for locks). 611 // Warning: the method can only be used on the running thread 612 bool is_in_stack(address adr) const; 613 // Check if address is in the usable part of the stack (excludes protected 614 // guard pages) 615 bool is_in_usable_stack(address adr) const; 616 617 // Sets this thread as starting thread. Returns failure if thread 618 // creation fails due to lack of memory, too many threads etc. 619 bool set_as_starting_thread(); 620 621 protected: 622 // OS data associated with the thread 623 OSThread* _osthread; // Platform-specific thread information 624 625 // Thread local resource area for temporary allocation within the VM 626 ResourceArea* _resource_area; 627 628 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 629 630 // Thread local handle area for allocation of handles within the VM 631 HandleArea* _handle_area; 632 GrowableArray<Metadata*>* _metadata_handles; 633 634 // Support for stack overflow handling, get_thread, etc. 635 address _stack_base; 636 size_t _stack_size; 637 uintptr_t _self_raw_id; // used by get_thread (mutable) 638 int _lgrp_id; 639 640 volatile void** polling_page_addr() { return &_polling_page; } 641 642 public: 643 // Stack overflow support 644 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 645 void set_stack_base(address base) { _stack_base = base; } 646 size_t stack_size() const { return _stack_size; } 647 void set_stack_size(size_t size) { _stack_size = size; } 648 address stack_end() const { return stack_base() - stack_size(); } 649 void record_stack_base_and_size(); 650 void register_thread_stack_with_NMT() NOT_NMT_RETURN; 651 652 bool on_local_stack(address adr) const { 653 // QQQ this has knowledge of direction, ought to be a stack method 654 return (_stack_base >= adr && adr >= stack_end()); 655 } 656 657 uintptr_t self_raw_id() { return _self_raw_id; } 658 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } 659 660 int lgrp_id() const { return _lgrp_id; } 661 void set_lgrp_id(int value) { _lgrp_id = value; } 662 663 // Printing 664 void print_on(outputStream* st, bool print_extended_info) const; 665 virtual void print_on(outputStream* st) const { print_on(st, false); } 666 void print() const { print_on(tty); } 667 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 668 void print_value_on(outputStream* st) const; 669 670 // Debug-only code 671 #ifdef ASSERT 672 private: 673 // Deadlock detection support for Mutex locks. List of locks own by thread. 674 Monitor* _owned_locks; 675 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 676 // thus the friendship 677 friend class Mutex; 678 friend class Monitor; 679 680 public: 681 void print_owned_locks_on(outputStream* st) const; 682 void print_owned_locks() const { print_owned_locks_on(tty); } 683 Monitor* owned_locks() const { return _owned_locks; } 684 bool owns_locks() const { return owned_locks() != NULL; } 685 bool owns_locks_but_compiled_lock() const; 686 int oops_do_parity() const { return _oops_do_parity; } 687 688 // Deadlock detection 689 bool allow_allocation() { return _allow_allocation_count == 0; } 690 ResourceMark* current_resource_mark() { return _current_resource_mark; } 691 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 692 #endif 693 694 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; 695 696 private: 697 volatile int _jvmti_env_iteration_count; 698 699 public: 700 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 701 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 702 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 703 704 // Code generation 705 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); } 706 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); } 707 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); } 708 709 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); } 710 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); } 711 712 static ByteSize polling_page_offset() { return byte_offset_of(Thread, _polling_page); } 713 714 static ByteSize tlab_start_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::start_offset(); } 715 static ByteSize tlab_end_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::end_offset(); } 716 static ByteSize tlab_top_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::top_offset(); } 717 static ByteSize tlab_pf_top_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::pf_top_offset(); } 718 719 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); } 720 721 JFR_ONLY(DEFINE_THREAD_LOCAL_OFFSET_JFR;) 722 723 public: 724 volatile intptr_t _Stalled; 725 volatile int _TypeTag; 726 ParkEvent * _ParkEvent; // for synchronized() 727 ParkEvent * _SleepEvent; // for Thread.sleep 728 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor 729 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease 730 int NativeSyncRecursion; // diagnostic 731 732 volatile int _OnTrap; // Resume-at IP delta 733 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG 734 jint _hashStateX; // thread-specific hashCode generator state 735 jint _hashStateY; 736 jint _hashStateZ; 737 738 volatile jint rng[4]; // RNG for spin loop 739 740 // Low-level leaf-lock primitives used to implement synchronization 741 // and native monitor-mutex infrastructure. 742 // Not for general synchronization use. 743 static void SpinAcquire(volatile int * Lock, const char * Name); 744 static void SpinRelease(volatile int * Lock); 745 static void muxAcquire(volatile intptr_t * Lock, const char * Name); 746 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev); 747 static void muxRelease(volatile intptr_t * Lock); 748 }; 749 750 // Inline implementation of Thread::current() 751 inline Thread* Thread::current() { 752 Thread* current = current_or_null(); 753 assert(current != NULL, "Thread::current() called on detached thread"); 754 return current; 755 } 756 757 inline Thread* Thread::current_or_null() { 758 #ifndef USE_LIBRARY_BASED_TLS_ONLY 759 return _thr_current; 760 #else 761 if (ThreadLocalStorage::is_initialized()) { 762 return ThreadLocalStorage::thread(); 763 } 764 return NULL; 765 #endif 766 } 767 768 inline Thread* Thread::current_or_null_safe() { 769 if (ThreadLocalStorage::is_initialized()) { 770 return ThreadLocalStorage::thread(); 771 } 772 return NULL; 773 } 774 775 class NonJavaThread: public Thread { 776 friend class VMStructs; 777 778 NonJavaThread* volatile _next; 779 780 class List; 781 static List _the_list; 782 783 public: 784 NonJavaThread(); 785 ~NonJavaThread(); 786 787 class Iterator; 788 }; 789 790 // Provides iteration over the list of NonJavaThreads. Because list 791 // management occurs in the NonJavaThread constructor and destructor, 792 // entries in the list may not be fully constructed instances of a 793 // derived class. Threads created after an iterator is constructed 794 // will not be visited by the iterator. The scope of an iterator is a 795 // critical section; there must be no safepoint checks in that scope. 796 class NonJavaThread::Iterator : public StackObj { 797 uint _protect_enter; 798 NonJavaThread* _current; 799 800 // Noncopyable. 801 Iterator(const Iterator&); 802 Iterator& operator=(const Iterator&); 803 804 public: 805 Iterator(); 806 ~Iterator(); 807 808 bool end() const { return _current == NULL; } 809 NonJavaThread* current() const { return _current; } 810 void step(); 811 }; 812 813 // Name support for threads. non-JavaThread subclasses with multiple 814 // uniquely named instances should derive from this. 815 class NamedThread: public NonJavaThread { 816 friend class VMStructs; 817 enum { 818 max_name_len = 64 819 }; 820 private: 821 char* _name; 822 // log JavaThread being processed by oops_do 823 JavaThread* _processed_thread; 824 uint _gc_id; // The current GC id when a thread takes part in GC 825 826 public: 827 NamedThread(); 828 ~NamedThread(); 829 // May only be called once per thread. 830 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); 831 void initialize_named_thread(); 832 virtual bool is_Named_thread() const { return true; } 833 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } 834 JavaThread *processed_thread() { return _processed_thread; } 835 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } 836 virtual void print_on(outputStream* st) const; 837 838 void set_gc_id(uint gc_id) { _gc_id = gc_id; } 839 uint gc_id() { return _gc_id; } 840 }; 841 842 // Worker threads are named and have an id of an assigned work. 843 class WorkerThread: public NamedThread { 844 private: 845 uint _id; 846 public: 847 WorkerThread() : _id(0) { } 848 virtual bool is_Worker_thread() const { return true; } 849 850 virtual WorkerThread* as_Worker_thread() const { 851 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); 852 return (WorkerThread*) this; 853 } 854 855 void set_id(uint work_id) { _id = work_id; } 856 uint id() const { return _id; } 857 }; 858 859 // A single WatcherThread is used for simulating timer interrupts. 860 class WatcherThread: public NonJavaThread { 861 friend class VMStructs; 862 public: 863 virtual void run(); 864 865 private: 866 static WatcherThread* _watcher_thread; 867 868 static bool _startable; 869 // volatile due to at least one lock-free read 870 volatile static bool _should_terminate; 871 public: 872 enum SomeConstants { 873 delay_interval = 10 // interrupt delay in milliseconds 874 }; 875 876 // Constructor 877 WatcherThread(); 878 879 // No destruction allowed 880 ~WatcherThread() { 881 guarantee(false, "WatcherThread deletion must fix the race with VM termination"); 882 } 883 884 // Tester 885 bool is_Watcher_thread() const { return true; } 886 887 // Printing 888 char* name() const { return (char*)"VM Periodic Task Thread"; } 889 void print_on(outputStream* st) const; 890 void unpark(); 891 892 // Returns the single instance of WatcherThread 893 static WatcherThread* watcher_thread() { return _watcher_thread; } 894 895 // Create and start the single instance of WatcherThread, or stop it on shutdown 896 static void start(); 897 static void stop(); 898 // Only allow start once the VM is sufficiently initialized 899 // Otherwise the first task to enroll will trigger the start 900 static void make_startable(); 901 private: 902 int sleep() const; 903 }; 904 905 906 class CompilerThread; 907 908 typedef void (*ThreadFunction)(JavaThread*, TRAPS); 909 910 class JavaThread: public Thread { 911 friend class VMStructs; 912 friend class JVMCIVMStructs; 913 friend class WhiteBox; 914 private: 915 JavaThread* _next; // The next thread in the Threads list 916 bool _on_thread_list; // Is set when this JavaThread is added to the Threads list 917 oop _threadObj; // The Java level thread object 918 919 #ifdef ASSERT 920 private: 921 int _java_call_counter; 922 923 public: 924 int java_call_counter() { return _java_call_counter; } 925 void inc_java_call_counter() { _java_call_counter++; } 926 void dec_java_call_counter() { 927 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 928 _java_call_counter--; 929 } 930 private: // restore original namespace restriction 931 #endif // ifdef ASSERT 932 933 #ifndef PRODUCT 934 public: 935 enum { 936 jump_ring_buffer_size = 16 937 }; 938 private: // restore original namespace restriction 939 #endif 940 941 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 942 943 ThreadFunction _entry_point; 944 945 JNIEnv _jni_environment; 946 947 // Deopt support 948 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 949 950 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we 951 // transition out of native 952 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized 953 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 954 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 955 // Because deoptimization is lazy we must save jvmti requests to set locals 956 // in compiled frames until we deoptimize and we have an interpreter frame. 957 // This holds the pointer to array (yeah like there might be more than one) of 958 // description of compiled vframes that have locals that need to be updated. 959 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; 960 961 // Handshake value for fixing 6243940. We need a place for the i2c 962 // adapter to store the callee Method*. This value is NEVER live 963 // across a gc point so it does NOT have to be gc'd 964 // The handshake is open ended since we can't be certain that it will 965 // be NULLed. This is because we rarely ever see the race and end up 966 // in handle_wrong_method which is the backend of the handshake. See 967 // code in i2c adapters and handle_wrong_method. 968 969 Method* _callee_target; 970 971 // Used to pass back results to the interpreter or generated code running Java code. 972 oop _vm_result; // oop result is GC-preserved 973 Metadata* _vm_result_2; // non-oop result 974 975 // See ReduceInitialCardMarks: this holds the precise space interval of 976 // the most recent slow path allocation for which compiled code has 977 // elided card-marks for performance along the fast-path. 978 MemRegion _deferred_card_mark; 979 980 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 981 // allocated during deoptimization 982 // and by JNI_MonitorEnter/Exit 983 984 // Async. requests support 985 enum AsyncRequests { 986 _no_async_condition = 0, 987 _async_exception, 988 _async_unsafe_access_error 989 }; 990 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request 991 oop _pending_async_exception; 992 993 // Safepoint support 994 public: // Expose _thread_state for SafeFetchInt() 995 volatile JavaThreadState _thread_state; 996 private: 997 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint 998 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 999 1000 // JavaThread termination support 1001 enum TerminatedTypes { 1002 _not_terminated = 0xDEAD - 2, 1003 _thread_exiting, // JavaThread::exit() has been called for this thread 1004 _thread_terminated, // JavaThread is removed from thread list 1005 _vm_exited // JavaThread is still executing native code, but VM is terminated 1006 // only VM_Exit can set _vm_exited 1007 }; 1008 1009 // In general a JavaThread's _terminated field transitions as follows: 1010 // 1011 // _not_terminated => _thread_exiting => _thread_terminated 1012 // 1013 // _vm_exited is a special value to cover the case of a JavaThread 1014 // executing native code after the VM itself is terminated. 1015 volatile TerminatedTypes _terminated; 1016 // suspend/resume support 1017 volatile bool _suspend_equivalent; // Suspend equivalent condition 1018 jint _in_deopt_handler; // count of deoptimization 1019 // handlers thread is in 1020 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 1021 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 1022 // never locked) when throwing an exception. Used by interpreter only. 1023 1024 // JNI attach states: 1025 enum JNIAttachStates { 1026 _not_attaching_via_jni = 1, // thread is not attaching via JNI 1027 _attaching_via_jni, // thread is attaching via JNI 1028 _attached_via_jni // thread has attached via JNI 1029 }; 1030 1031 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 1032 // A native thread that is attaching via JNI starts with a value 1033 // of _attaching_via_jni and transitions to _attached_via_jni. 1034 volatile JNIAttachStates _jni_attach_state; 1035 1036 public: 1037 // State of the stack guard pages for this thread. 1038 enum StackGuardState { 1039 stack_guard_unused, // not needed 1040 stack_guard_reserved_disabled, 1041 stack_guard_yellow_reserved_disabled,// disabled (temporarily) after stack overflow 1042 stack_guard_enabled // enabled 1043 }; 1044 1045 private: 1046 1047 #if INCLUDE_JVMCI 1048 // The _pending_* fields below are used to communicate extra information 1049 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. 1050 1051 // Communicates the DeoptReason and DeoptAction of the uncommon trap 1052 int _pending_deoptimization; 1053 1054 // Specifies whether the uncommon trap is to bci 0 of a synchronized method 1055 // before the monitor has been acquired. 1056 bool _pending_monitorenter; 1057 1058 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter 1059 bool _pending_transfer_to_interpreter; 1060 1061 // Guard for re-entrant call to JVMCIRuntime::adjust_comp_level 1062 bool _adjusting_comp_level; 1063 1064 // True if in a runtime call from compiled code that will deoptimize 1065 // and re-execute a failed heap allocation in the interpreter. 1066 bool _in_retryable_allocation; 1067 1068 // An id of a speculation that JVMCI compiled code can use to further describe and 1069 // uniquely identify the speculative optimization guarded by the uncommon trap 1070 long _pending_failed_speculation; 1071 1072 // These fields are mutually exclusive in terms of live ranges. 1073 union { 1074 // Communicates the pc at which the most recent implicit exception occurred 1075 // from the signal handler to a deoptimization stub. 1076 address _implicit_exception_pc; 1077 1078 // Communicates an alternative call target to an i2c stub from a JavaCall . 1079 address _alternate_call_target; 1080 } _jvmci; 1081 1082 // Support for high precision, thread sensitive counters in JVMCI compiled code. 1083 jlong* _jvmci_counters; 1084 1085 public: 1086 static jlong* _jvmci_old_thread_counters; 1087 static void collect_counters(typeArrayOop array); 1088 private: 1089 #endif // INCLUDE_JVMCI 1090 1091 StackGuardState _stack_guard_state; 1092 1093 // Precompute the limit of the stack as used in stack overflow checks. 1094 // We load it from here to simplify the stack overflow check in assembly. 1095 address _stack_overflow_limit; 1096 address _reserved_stack_activation; 1097 1098 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 1099 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 1100 // code) 1101 volatile oop _exception_oop; // Exception thrown in compiled code 1102 volatile address _exception_pc; // PC where exception happened 1103 volatile address _exception_handler_pc; // PC for handler of exception 1104 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 1105 1106 private: 1107 // support for JNI critical regions 1108 jint _jni_active_critical; // count of entries into JNI critical region 1109 1110 // Checked JNI: function name requires exception check 1111 char* _pending_jni_exception_check_fn; 1112 1113 // For deadlock detection. 1114 int _depth_first_number; 1115 1116 // JVMTI PopFrame support 1117 // This is set to popframe_pending to signal that top Java frame should be popped immediately 1118 int _popframe_condition; 1119 1120 // If reallocation of scalar replaced objects fails, we throw OOM 1121 // and during exception propagation, pop the top 1122 // _frames_to_pop_failed_realloc frames, the ones that reference 1123 // failed reallocations. 1124 int _frames_to_pop_failed_realloc; 1125 1126 #ifndef PRODUCT 1127 int _jmp_ring_index; 1128 struct { 1129 // We use intptr_t instead of address so debugger doesn't try and display strings 1130 intptr_t _target; 1131 intptr_t _instruction; 1132 const char* _file; 1133 int _line; 1134 } _jmp_ring[jump_ring_buffer_size]; 1135 #endif // PRODUCT 1136 1137 friend class VMThread; 1138 friend class ThreadWaitTransition; 1139 friend class VM_Exit; 1140 1141 void initialize(); // Initialized the instance variables 1142 1143 public: 1144 // Constructor 1145 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads 1146 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 1147 ~JavaThread(); 1148 1149 #ifdef ASSERT 1150 // verify this JavaThread hasn't be published in the Threads::list yet 1151 void verify_not_published(); 1152 #endif 1153 1154 //JNI functiontable getter/setter for JVMTI jni function table interception API. 1155 void set_jni_functions(struct JNINativeInterface_* functionTable) { 1156 _jni_environment.functions = functionTable; 1157 } 1158 struct JNINativeInterface_* get_jni_functions() { 1159 return (struct JNINativeInterface_ *)_jni_environment.functions; 1160 } 1161 1162 // This function is called at thread creation to allow 1163 // platform specific thread variables to be initialized. 1164 void cache_global_variables(); 1165 1166 // Executes Shutdown.shutdown() 1167 void invoke_shutdown_hooks(); 1168 1169 // Cleanup on thread exit 1170 enum ExitType { 1171 normal_exit, 1172 jni_detach 1173 }; 1174 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 1175 1176 void cleanup_failed_attach_current_thread(); 1177 1178 // Testers 1179 virtual bool is_Java_thread() const { return true; } 1180 virtual bool can_call_java() const { return true; } 1181 1182 // Thread chain operations 1183 JavaThread* next() const { return _next; } 1184 void set_next(JavaThread* p) { _next = p; } 1185 1186 // Thread oop. threadObj() can be NULL for initial JavaThread 1187 // (or for threads attached via JNI) 1188 oop threadObj() const { return _threadObj; } 1189 void set_threadObj(oop p) { _threadObj = p; } 1190 1191 ThreadPriority java_priority() const; // Read from threadObj() 1192 1193 // Prepare thread and add to priority queue. If a priority is 1194 // not specified, use the priority of the thread object. Threads_lock 1195 // must be held while this function is called. 1196 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 1197 1198 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 1199 address saved_exception_pc() { return _saved_exception_pc; } 1200 1201 1202 ThreadFunction entry_point() const { return _entry_point; } 1203 1204 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1205 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS); 1206 1207 // Last frame anchor routines 1208 1209 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1210 1211 // last_Java_sp 1212 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1213 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1214 1215 // last_Java_pc 1216 1217 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1218 1219 // Safepoint support 1220 #if !(defined(PPC64) || defined(AARCH64)) 1221 JavaThreadState thread_state() const { return _thread_state; } 1222 void set_thread_state(JavaThreadState s) { _thread_state = s; } 1223 #else 1224 // Use membars when accessing volatile _thread_state. See 1225 // Threads::create_vm() for size checks. 1226 inline JavaThreadState thread_state() const; 1227 inline void set_thread_state(JavaThreadState s); 1228 #endif 1229 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } 1230 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } 1231 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } 1232 1233 // JavaThread termination and lifecycle support: 1234 void smr_delete(); 1235 bool on_thread_list() const { return _on_thread_list; } 1236 void set_on_thread_list() { _on_thread_list = true; } 1237 1238 // thread has called JavaThread::exit() or is terminated 1239 bool is_exiting() const; 1240 // thread is terminated (no longer on the threads list); we compare 1241 // against the two non-terminated values so that a freed JavaThread 1242 // will also be considered terminated. 1243 bool check_is_terminated(TerminatedTypes l_terminated) const { 1244 return l_terminated != _not_terminated && l_terminated != _thread_exiting; 1245 } 1246 bool is_terminated() const; 1247 void set_terminated(TerminatedTypes t); 1248 // special for Threads::remove() which is static: 1249 void set_terminated_value(); 1250 void block_if_vm_exited(); 1251 1252 bool doing_unsafe_access() { return _doing_unsafe_access; } 1253 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1254 1255 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1256 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1257 1258 inline void set_polling_page_release(void* poll_value); 1259 inline void set_polling_page(void* poll_value); 1260 inline volatile void* get_polling_page(); 1261 1262 private: 1263 // Support for thread handshake operations 1264 HandshakeState _handshake; 1265 public: 1266 void set_handshake_operation(HandshakeOperation* op) { 1267 _handshake.set_operation(this, op); 1268 } 1269 1270 bool has_handshake() const { 1271 return _handshake.has_operation(); 1272 } 1273 1274 void handshake_process_by_self() { 1275 _handshake.process_by_self(this); 1276 } 1277 1278 void handshake_process_by_vmthread() { 1279 _handshake.process_by_vmthread(this); 1280 } 1281 1282 // Suspend/resume support for JavaThread 1283 private: 1284 inline void set_ext_suspended(); 1285 inline void clear_ext_suspended(); 1286 1287 public: 1288 void java_suspend(); 1289 void java_resume(); 1290 int java_suspend_self(); 1291 1292 void check_and_wait_while_suspended() { 1293 assert(JavaThread::current() == this, "sanity check"); 1294 1295 bool do_self_suspend; 1296 do { 1297 // were we externally suspended while we were waiting? 1298 do_self_suspend = handle_special_suspend_equivalent_condition(); 1299 if (do_self_suspend) { 1300 // don't surprise the thread that suspended us by returning 1301 java_suspend_self(); 1302 set_suspend_equivalent(); 1303 } 1304 } while (do_self_suspend); 1305 } 1306 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); 1307 // Check for async exception in addition to safepoint and suspend request. 1308 static void check_special_condition_for_native_trans(JavaThread *thread); 1309 1310 // Same as check_special_condition_for_native_trans but finishes the 1311 // transition into thread_in_Java mode so that it can potentially 1312 // block. 1313 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); 1314 1315 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); 1316 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { 1317 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1318 // Warning: is_ext_suspend_completed() may temporarily drop the 1319 // SR_lock to allow the thread to reach a stable thread state if 1320 // it is currently in a transient thread state. 1321 return is_ext_suspend_completed(false /* !called_by_wait */, 1322 SuspendRetryDelay, bits); 1323 } 1324 1325 // We cannot allow wait_for_ext_suspend_completion() to run forever or 1326 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally 1327 // passed as the count and delay parameters. Experiments with specific 1328 // calls to wait_for_ext_suspend_completion() can be done by passing 1329 // other values in the code. Experiments with all calls can be done 1330 // via the appropriate -XX options. 1331 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); 1332 1333 // test for suspend - most (all?) of these should go away 1334 bool is_thread_fully_suspended(bool wait_for_suspend, uint32_t *bits); 1335 1336 inline void set_external_suspend(); 1337 inline void clear_external_suspend(); 1338 1339 inline void set_deopt_suspend(); 1340 inline void clear_deopt_suspend(); 1341 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } 1342 1343 bool is_external_suspend() const { 1344 return (_suspend_flags & _external_suspend) != 0; 1345 } 1346 // Whenever a thread transitions from native to vm/java it must suspend 1347 // if external|deopt suspend is present. 1348 bool is_suspend_after_native() const { 1349 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0; 1350 } 1351 1352 // external suspend request is completed 1353 bool is_ext_suspended() const { 1354 return (_suspend_flags & _ext_suspended) != 0; 1355 } 1356 1357 bool is_external_suspend_with_lock() const { 1358 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1359 return is_external_suspend(); 1360 } 1361 1362 // Special method to handle a pending external suspend request 1363 // when a suspend equivalent condition lifts. 1364 bool handle_special_suspend_equivalent_condition() { 1365 assert(is_suspend_equivalent(), 1366 "should only be called in a suspend equivalence condition"); 1367 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1368 bool ret = is_external_suspend(); 1369 if (!ret) { 1370 // not about to self-suspend so clear suspend equivalence 1371 clear_suspend_equivalent(); 1372 } 1373 // implied else: 1374 // We have a pending external suspend request so we leave the 1375 // suspend_equivalent flag set until java_suspend_self() sets 1376 // the ext_suspended flag and clears the suspend_equivalent 1377 // flag. This insures that wait_for_ext_suspend_completion() 1378 // will return consistent values. 1379 return ret; 1380 } 1381 1382 // utility methods to see if we are doing some kind of suspension 1383 bool is_being_ext_suspended() const { 1384 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1385 return is_ext_suspended() || is_external_suspend(); 1386 } 1387 1388 bool is_suspend_equivalent() const { return _suspend_equivalent; } 1389 1390 void set_suspend_equivalent() { _suspend_equivalent = true; } 1391 void clear_suspend_equivalent() { _suspend_equivalent = false; } 1392 1393 // Thread.stop support 1394 void send_thread_stop(oop throwable); 1395 AsyncRequests clear_special_runtime_exit_condition() { 1396 AsyncRequests x = _special_runtime_exit_condition; 1397 _special_runtime_exit_condition = _no_async_condition; 1398 return x; 1399 } 1400 1401 // Are any async conditions present? 1402 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } 1403 1404 void check_and_handle_async_exceptions(bool check_unsafe_error = true); 1405 1406 // these next two are also used for self-suspension and async exception support 1407 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1408 1409 // Return true if JavaThread has an asynchronous condition or 1410 // if external suspension is requested. 1411 bool has_special_runtime_exit_condition() { 1412 // Because we don't use is_external_suspend_with_lock 1413 // it is possible that we won't see an asynchronous external suspend 1414 // request that has just gotten started, i.e., SR_lock grabbed but 1415 // _external_suspend field change either not made yet or not visible 1416 // yet. However, this is okay because the request is asynchronous and 1417 // we will see the new flag value the next time through. It's also 1418 // possible that the external suspend request is dropped after 1419 // we have checked is_external_suspend(), we will recheck its value 1420 // under SR_lock in java_suspend_self(). 1421 return (_special_runtime_exit_condition != _no_async_condition) || 1422 is_external_suspend() || is_trace_suspend(); 1423 } 1424 1425 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } 1426 1427 inline void set_pending_async_exception(oop e); 1428 1429 // Fast-locking support 1430 bool is_lock_owned(address adr) const; 1431 1432 // Accessors for vframe array top 1433 // The linked list of vframe arrays are sorted on sp. This means when we 1434 // unpack the head must contain the vframe array to unpack. 1435 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1436 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1437 1438 // Side structure for deferring update of java frame locals until deopt occurs 1439 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } 1440 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } 1441 1442 // These only really exist to make debugging deopt problems simpler 1443 1444 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1445 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1446 1447 // The special resourceMark used during deoptimization 1448 1449 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1450 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1451 1452 intptr_t* must_deopt_id() { return _must_deopt_id; } 1453 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } 1454 void clear_must_deopt_id() { _must_deopt_id = NULL; } 1455 1456 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; } 1457 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; } 1458 1459 Method* callee_target() const { return _callee_target; } 1460 void set_callee_target (Method* x) { _callee_target = x; } 1461 1462 // Oop results of vm runtime calls 1463 oop vm_result() const { return _vm_result; } 1464 void set_vm_result (oop x) { _vm_result = x; } 1465 1466 Metadata* vm_result_2() const { return _vm_result_2; } 1467 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1468 1469 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1470 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1471 1472 #if INCLUDE_JVMCI 1473 int pending_deoptimization() const { return _pending_deoptimization; } 1474 long pending_failed_speculation() const { return _pending_failed_speculation; } 1475 bool adjusting_comp_level() const { return _adjusting_comp_level; } 1476 void set_adjusting_comp_level(bool b) { _adjusting_comp_level = b; } 1477 bool has_pending_monitorenter() const { return _pending_monitorenter; } 1478 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } 1479 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } 1480 void set_pending_failed_speculation(long failed_speculation) { _pending_failed_speculation = failed_speculation; } 1481 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } 1482 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; } 1483 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; } 1484 1485 virtual bool in_retryable_allocation() const { return _in_retryable_allocation; } 1486 void set_in_retryable_allocation(bool b) { _in_retryable_allocation = b; } 1487 #endif // INCLUDE_JVMCI 1488 1489 // Exception handling for compiled methods 1490 oop exception_oop() const { return _exception_oop; } 1491 address exception_pc() const { return _exception_pc; } 1492 address exception_handler_pc() const { return _exception_handler_pc; } 1493 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1494 1495 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); } 1496 void set_exception_pc(address a) { _exception_pc = a; } 1497 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1498 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1499 1500 void clear_exception_oop_and_pc() { 1501 set_exception_oop(NULL); 1502 set_exception_pc(NULL); 1503 } 1504 1505 // Stack overflow support 1506 // 1507 // (small addresses) 1508 // 1509 // -- <-- stack_end() --- 1510 // | | 1511 // | red pages | 1512 // | | 1513 // -- <-- stack_red_zone_base() | 1514 // | | 1515 // | guard 1516 // | yellow pages zone 1517 // | | 1518 // | | 1519 // -- <-- stack_yellow_zone_base() | 1520 // | | 1521 // | | 1522 // | reserved pages | 1523 // | | 1524 // -- <-- stack_reserved_zone_base() --- --- 1525 // /|\ shadow <-- stack_overflow_limit() (somewhere in here) 1526 // | zone 1527 // \|/ size 1528 // some untouched memory --- 1529 // 1530 // 1531 // -- 1532 // | 1533 // | shadow zone 1534 // | 1535 // -- 1536 // x frame n 1537 // -- 1538 // x frame n-1 1539 // x 1540 // -- 1541 // ... 1542 // 1543 // -- 1544 // x frame 0 1545 // -- <-- stack_base() 1546 // 1547 // (large addresses) 1548 // 1549 1550 private: 1551 // These values are derived from flags StackRedPages, StackYellowPages, 1552 // StackReservedPages and StackShadowPages. The zone size is determined 1553 // ergonomically if page_size > 4K. 1554 static size_t _stack_red_zone_size; 1555 static size_t _stack_yellow_zone_size; 1556 static size_t _stack_reserved_zone_size; 1557 static size_t _stack_shadow_zone_size; 1558 public: 1559 inline size_t stack_available(address cur_sp); 1560 1561 static size_t stack_red_zone_size() { 1562 assert(_stack_red_zone_size > 0, "Don't call this before the field is initialized."); 1563 return _stack_red_zone_size; 1564 } 1565 static void set_stack_red_zone_size(size_t s) { 1566 assert(is_aligned(s, os::vm_page_size()), 1567 "We can not protect if the red zone size is not page aligned."); 1568 assert(_stack_red_zone_size == 0, "This should be called only once."); 1569 _stack_red_zone_size = s; 1570 } 1571 address stack_red_zone_base() { 1572 return (address)(stack_end() + stack_red_zone_size()); 1573 } 1574 bool in_stack_red_zone(address a) { 1575 return a <= stack_red_zone_base() && a >= stack_end(); 1576 } 1577 1578 static size_t stack_yellow_zone_size() { 1579 assert(_stack_yellow_zone_size > 0, "Don't call this before the field is initialized."); 1580 return _stack_yellow_zone_size; 1581 } 1582 static void set_stack_yellow_zone_size(size_t s) { 1583 assert(is_aligned(s, os::vm_page_size()), 1584 "We can not protect if the yellow zone size is not page aligned."); 1585 assert(_stack_yellow_zone_size == 0, "This should be called only once."); 1586 _stack_yellow_zone_size = s; 1587 } 1588 1589 static size_t stack_reserved_zone_size() { 1590 // _stack_reserved_zone_size may be 0. This indicates the feature is off. 1591 return _stack_reserved_zone_size; 1592 } 1593 static void set_stack_reserved_zone_size(size_t s) { 1594 assert(is_aligned(s, os::vm_page_size()), 1595 "We can not protect if the reserved zone size is not page aligned."); 1596 assert(_stack_reserved_zone_size == 0, "This should be called only once."); 1597 _stack_reserved_zone_size = s; 1598 } 1599 address stack_reserved_zone_base() { 1600 return (address)(stack_end() + 1601 (stack_red_zone_size() + stack_yellow_zone_size() + stack_reserved_zone_size())); 1602 } 1603 bool in_stack_reserved_zone(address a) { 1604 return (a <= stack_reserved_zone_base()) && 1605 (a >= (address)((intptr_t)stack_reserved_zone_base() - stack_reserved_zone_size())); 1606 } 1607 1608 static size_t stack_yellow_reserved_zone_size() { 1609 return _stack_yellow_zone_size + _stack_reserved_zone_size; 1610 } 1611 bool in_stack_yellow_reserved_zone(address a) { 1612 return (a <= stack_reserved_zone_base()) && (a >= stack_red_zone_base()); 1613 } 1614 1615 // Size of red + yellow + reserved zones. 1616 static size_t stack_guard_zone_size() { 1617 return stack_red_zone_size() + stack_yellow_reserved_zone_size(); 1618 } 1619 1620 static size_t stack_shadow_zone_size() { 1621 assert(_stack_shadow_zone_size > 0, "Don't call this before the field is initialized."); 1622 return _stack_shadow_zone_size; 1623 } 1624 static void set_stack_shadow_zone_size(size_t s) { 1625 // The shadow area is not allocated or protected, so 1626 // it needs not be page aligned. 1627 // But the stack bang currently assumes that it is a 1628 // multiple of page size. This guarantees that the bang 1629 // loop touches all pages in the shadow zone. 1630 // This can be guaranteed differently, as well. E.g., if 1631 // the page size is a multiple of 4K, banging in 4K steps 1632 // suffices to touch all pages. (Some pages are banged 1633 // several times, though.) 1634 assert(is_aligned(s, os::vm_page_size()), 1635 "Stack bang assumes multiple of page size."); 1636 assert(_stack_shadow_zone_size == 0, "This should be called only once."); 1637 _stack_shadow_zone_size = s; 1638 } 1639 1640 void create_stack_guard_pages(); 1641 void remove_stack_guard_pages(); 1642 1643 void enable_stack_reserved_zone(); 1644 void disable_stack_reserved_zone(); 1645 void enable_stack_yellow_reserved_zone(); 1646 void disable_stack_yellow_reserved_zone(); 1647 void enable_stack_red_zone(); 1648 void disable_stack_red_zone(); 1649 1650 inline bool stack_guard_zone_unused(); 1651 inline bool stack_yellow_reserved_zone_disabled(); 1652 inline bool stack_reserved_zone_disabled(); 1653 inline bool stack_guards_enabled(); 1654 1655 address reserved_stack_activation() const { return _reserved_stack_activation; } 1656 void set_reserved_stack_activation(address addr) { 1657 assert(_reserved_stack_activation == stack_base() 1658 || _reserved_stack_activation == NULL 1659 || addr == stack_base(), "Must not be set twice"); 1660 _reserved_stack_activation = addr; 1661 } 1662 1663 // Attempt to reguard the stack after a stack overflow may have occurred. 1664 // Returns true if (a) guard pages are not needed on this thread, (b) the 1665 // pages are already guarded, or (c) the pages were successfully reguarded. 1666 // Returns false if there is not enough stack space to reguard the pages, in 1667 // which case the caller should unwind a frame and try again. The argument 1668 // should be the caller's (approximate) sp. 1669 bool reguard_stack(address cur_sp); 1670 // Similar to above but see if current stackpoint is out of the guard area 1671 // and reguard if possible. 1672 bool reguard_stack(void); 1673 1674 address stack_overflow_limit() { return _stack_overflow_limit; } 1675 void set_stack_overflow_limit() { 1676 _stack_overflow_limit = 1677 stack_end() + MAX2(JavaThread::stack_guard_zone_size(), JavaThread::stack_shadow_zone_size()); 1678 } 1679 1680 // Misc. accessors/mutators 1681 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1682 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1683 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1684 1685 #ifndef PRODUCT 1686 void record_jump(address target, address instr, const char* file, int line); 1687 #endif // PRODUCT 1688 1689 // For assembly stub generation 1690 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } 1691 #ifndef PRODUCT 1692 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); } 1693 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); } 1694 #endif // PRODUCT 1695 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } 1696 static ByteSize pending_jni_exception_check_fn_offset() { 1697 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn); 1698 } 1699 static ByteSize last_Java_sp_offset() { 1700 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1701 } 1702 static ByteSize last_Java_pc_offset() { 1703 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1704 } 1705 static ByteSize frame_anchor_offset() { 1706 return byte_offset_of(JavaThread, _anchor); 1707 } 1708 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } 1709 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } 1710 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } 1711 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } 1712 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } 1713 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } 1714 #if INCLUDE_JVMCI 1715 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); } 1716 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); } 1717 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); } 1718 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); } 1719 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); } 1720 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); } 1721 #endif // INCLUDE_JVMCI 1722 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } 1723 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } 1724 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1725 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } 1726 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1727 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); } 1728 static ByteSize reserved_stack_activation_offset() { return byte_offset_of(JavaThread, _reserved_stack_activation); } 1729 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } 1730 1731 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1732 static ByteSize should_post_on_exceptions_flag_offset() { 1733 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1734 } 1735 1736 // Returns the jni environment for this thread 1737 JNIEnv* jni_environment() { return &_jni_environment; } 1738 1739 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1740 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1741 // Only return NULL if thread is off the thread list; starting to 1742 // exit should not return NULL. 1743 if (thread_from_jni_env->is_terminated()) { 1744 thread_from_jni_env->block_if_vm_exited(); 1745 return NULL; 1746 } else { 1747 return thread_from_jni_env; 1748 } 1749 } 1750 1751 // JNI critical regions. These can nest. 1752 bool in_critical() { return _jni_active_critical > 0; } 1753 bool in_last_critical() { return _jni_active_critical == 1; } 1754 void enter_critical() { 1755 assert(Thread::current() == this || 1756 (Thread::current()->is_VM_thread() && 1757 SafepointSynchronize::is_synchronizing()), 1758 "this must be current thread or synchronizing"); 1759 _jni_active_critical++; 1760 } 1761 void exit_critical() { 1762 assert(Thread::current() == this, "this must be current thread"); 1763 _jni_active_critical--; 1764 assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); 1765 } 1766 1767 // Checked JNI: is the programmer required to check for exceptions, if so specify 1768 // which function name. Returning to a Java frame should implicitly clear the 1769 // pending check, this is done for Native->Java transitions (i.e. user JNI code). 1770 // VM->Java transistions are not cleared, it is expected that JNI code enclosed 1771 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal). 1772 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1773 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1774 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1775 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1776 1777 // For deadlock detection 1778 int depth_first_number() { return _depth_first_number; } 1779 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1780 1781 private: 1782 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1783 1784 public: 1785 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1786 void add_monitor_chunk(MonitorChunk* chunk); 1787 void remove_monitor_chunk(MonitorChunk* chunk); 1788 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1789 void inc_in_deopt_handler() { _in_deopt_handler++; } 1790 void dec_in_deopt_handler() { 1791 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1792 if (_in_deopt_handler > 0) { // robustness 1793 _in_deopt_handler--; 1794 } 1795 } 1796 1797 private: 1798 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1799 1800 public: 1801 1802 // Frame iteration; calls the function f for all frames on the stack 1803 void frames_do(void f(frame*, const RegisterMap*)); 1804 1805 // Memory operations 1806 void oops_do(OopClosure* f, CodeBlobClosure* cf); 1807 1808 // Sweeper operations 1809 virtual void nmethods_do(CodeBlobClosure* cf); 1810 1811 // RedefineClasses Support 1812 void metadata_do(void f(Metadata*)); 1813 1814 // Misc. operations 1815 char* name() const { return (char*)get_thread_name(); } 1816 void print_on(outputStream* st, bool print_extended_info) const; 1817 void print_on(outputStream* st) const { print_on(st, false); } 1818 void print_value(); 1819 void print_thread_state_on(outputStream*) const PRODUCT_RETURN; 1820 void print_thread_state() const PRODUCT_RETURN; 1821 void print_on_error(outputStream* st, char* buf, int buflen) const; 1822 void print_name_on_error(outputStream* st, char* buf, int buflen) const; 1823 void verify(); 1824 const char* get_thread_name() const; 1825 private: 1826 // factor out low-level mechanics for use in both normal and error cases 1827 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1828 public: 1829 const char* get_threadgroup_name() const; 1830 const char* get_parent_name() const; 1831 1832 // Accessing frames 1833 frame last_frame() { 1834 _anchor.make_walkable(this); 1835 return pd_last_frame(); 1836 } 1837 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1838 1839 // Returns method at 'depth' java or native frames down the stack 1840 // Used for security checks 1841 Klass* security_get_caller_class(int depth); 1842 1843 // Print stack trace in external format 1844 void print_stack_on(outputStream* st); 1845 void print_stack() { print_stack_on(tty); } 1846 1847 // Print stack traces in various internal formats 1848 void trace_stack() PRODUCT_RETURN; 1849 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1850 void trace_frames() PRODUCT_RETURN; 1851 void trace_oops() PRODUCT_RETURN; 1852 1853 // Print an annotated view of the stack frames 1854 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1855 void validate_frame_layout() { 1856 print_frame_layout(0, true); 1857 } 1858 1859 // Returns the number of stack frames on the stack 1860 int depth() const; 1861 1862 // Function for testing deoptimization 1863 void deoptimize(); 1864 void make_zombies(); 1865 1866 void deoptimized_wrt_marked_nmethods(); 1867 1868 public: 1869 // Returns the running thread as a JavaThread 1870 static inline JavaThread* current(); 1871 1872 // Returns the active Java thread. Do not use this if you know you are calling 1873 // from a JavaThread, as it's slower than JavaThread::current. If called from 1874 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1875 // operation. You may not want that either. 1876 static JavaThread* active(); 1877 1878 inline CompilerThread* as_CompilerThread(); 1879 1880 public: 1881 virtual void run(); 1882 void thread_main_inner(); 1883 1884 private: 1885 // PRIVILEGED STACK 1886 PrivilegedElement* _privileged_stack_top; 1887 GrowableArray<oop>* _array_for_gc; 1888 public: 1889 1890 // Returns the privileged_stack information. 1891 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } 1892 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } 1893 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } 1894 1895 public: 1896 // Thread local information maintained by JVMTI. 1897 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1898 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1899 // getter is used to get this JavaThread's JvmtiThreadState if it has 1900 // one which means NULL can be returned. JvmtiThreadState::state_for() 1901 // is used to get the specified JavaThread's JvmtiThreadState if it has 1902 // one or it allocates a new JvmtiThreadState for the JavaThread and 1903 // returns it. JvmtiThreadState::state_for() will return NULL only if 1904 // the specified JavaThread is exiting. 1905 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1906 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1907 1908 // JVMTI PopFrame support 1909 // Setting and clearing popframe_condition 1910 // All of these enumerated values are bits. popframe_pending 1911 // indicates that a PopFrame() has been requested and not yet been 1912 // completed. popframe_processing indicates that that PopFrame() is in 1913 // the process of being completed. popframe_force_deopt_reexecution_bit 1914 // indicates that special handling is required when returning to a 1915 // deoptimized caller. 1916 enum PopCondition { 1917 popframe_inactive = 0x00, 1918 popframe_pending_bit = 0x01, 1919 popframe_processing_bit = 0x02, 1920 popframe_force_deopt_reexecution_bit = 0x04 1921 }; 1922 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1923 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1924 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1925 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1926 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1927 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1928 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1929 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1930 #ifdef CC_INTERP 1931 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } 1932 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } 1933 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1934 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1935 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1936 #endif 1937 1938 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1939 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1940 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1941 1942 private: 1943 // Saved incoming arguments to popped frame. 1944 // Used only when popped interpreted frame returns to deoptimized frame. 1945 void* _popframe_preserved_args; 1946 int _popframe_preserved_args_size; 1947 1948 public: 1949 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1950 void* popframe_preserved_args(); 1951 ByteSize popframe_preserved_args_size(); 1952 WordSize popframe_preserved_args_size_in_words(); 1953 void popframe_free_preserved_args(); 1954 1955 1956 private: 1957 JvmtiThreadState *_jvmti_thread_state; 1958 1959 // Used by the interpreter in fullspeed mode for frame pop, method 1960 // entry, method exit and single stepping support. This field is 1961 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. 1962 // It can be set to zero asynchronously (i.e., without a VM operation 1963 // or a lock) so we have to be very careful. 1964 int _interp_only_mode; 1965 1966 public: 1967 // used by the interpreter for fullspeed debugging support (see above) 1968 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1969 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1970 int get_interp_only_mode() { return _interp_only_mode; } 1971 void increment_interp_only_mode() { ++_interp_only_mode; } 1972 void decrement_interp_only_mode() { --_interp_only_mode; } 1973 1974 // support for cached flag that indicates whether exceptions need to be posted for this thread 1975 // if this is false, we can avoid deoptimizing when events are thrown 1976 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1977 private: 1978 int _should_post_on_exceptions_flag; 1979 1980 public: 1981 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1982 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1983 1984 private: 1985 ThreadStatistics *_thread_stat; 1986 1987 public: 1988 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1989 1990 // Return a blocker object for which this thread is blocked parking. 1991 oop current_park_blocker(); 1992 1993 private: 1994 static size_t _stack_size_at_create; 1995 1996 public: 1997 static inline size_t stack_size_at_create(void) { 1998 return _stack_size_at_create; 1999 } 2000 static inline void set_stack_size_at_create(size_t value) { 2001 _stack_size_at_create = value; 2002 } 2003 2004 // Machine dependent stuff 2005 #include OS_CPU_HEADER(thread) 2006 2007 public: 2008 void set_blocked_on_compilation(bool value) { 2009 _blocked_on_compilation = value; 2010 } 2011 2012 bool blocked_on_compilation() { 2013 return _blocked_on_compilation; 2014 } 2015 protected: 2016 bool _blocked_on_compilation; 2017 2018 2019 // JSR166 per-thread parker 2020 private: 2021 Parker* _parker; 2022 public: 2023 Parker* parker() { return _parker; } 2024 2025 // Biased locking support 2026 private: 2027 GrowableArray<MonitorInfo*>* _cached_monitor_info; 2028 public: 2029 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 2030 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 2031 2032 // clearing/querying jni attach status 2033 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 2034 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 2035 inline void set_done_attaching_via_jni(); 2036 }; 2037 2038 // Inline implementation of JavaThread::current 2039 inline JavaThread* JavaThread::current() { 2040 Thread* thread = Thread::current(); 2041 assert(thread->is_Java_thread(), "just checking"); 2042 return (JavaThread*)thread; 2043 } 2044 2045 inline CompilerThread* JavaThread::as_CompilerThread() { 2046 assert(is_Compiler_thread(), "just checking"); 2047 return (CompilerThread*)this; 2048 } 2049 2050 // Dedicated thread to sweep the code cache 2051 class CodeCacheSweeperThread : public JavaThread { 2052 CompiledMethod* _scanned_compiled_method; // nmethod being scanned by the sweeper 2053 public: 2054 CodeCacheSweeperThread(); 2055 // Track the nmethod currently being scanned by the sweeper 2056 void set_scanned_compiled_method(CompiledMethod* cm) { 2057 assert(_scanned_compiled_method == NULL || cm == NULL, "should reset to NULL before writing a new value"); 2058 _scanned_compiled_method = cm; 2059 } 2060 2061 // Hide sweeper thread from external view. 2062 bool is_hidden_from_external_view() const { return true; } 2063 2064 bool is_Code_cache_sweeper_thread() const { return true; } 2065 2066 // Prevent GC from unloading _scanned_compiled_method 2067 void oops_do(OopClosure* f, CodeBlobClosure* cf); 2068 void nmethods_do(CodeBlobClosure* cf); 2069 }; 2070 2071 // A thread used for Compilation. 2072 class CompilerThread : public JavaThread { 2073 friend class VMStructs; 2074 private: 2075 CompilerCounters* _counters; 2076 2077 ciEnv* _env; 2078 CompileLog* _log; 2079 CompileTask* volatile _task; // print_threads_compiling can read this concurrently. 2080 CompileQueue* _queue; 2081 BufferBlob* _buffer_blob; 2082 2083 AbstractCompiler* _compiler; 2084 TimeStamp _idle_time; 2085 2086 public: 2087 2088 static CompilerThread* current(); 2089 2090 CompilerThread(CompileQueue* queue, CompilerCounters* counters); 2091 ~CompilerThread(); 2092 2093 bool is_Compiler_thread() const { return true; } 2094 2095 virtual bool can_call_java() const; 2096 2097 // Hide native compiler threads from external view. 2098 bool is_hidden_from_external_view() const { return !can_call_java(); } 2099 2100 void set_compiler(AbstractCompiler* c) { _compiler = c; } 2101 AbstractCompiler* compiler() const { return _compiler; } 2102 2103 CompileQueue* queue() const { return _queue; } 2104 CompilerCounters* counters() const { return _counters; } 2105 2106 // Get/set the thread's compilation environment. 2107 ciEnv* env() { return _env; } 2108 void set_env(ciEnv* env) { _env = env; } 2109 2110 BufferBlob* get_buffer_blob() const { return _buffer_blob; } 2111 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; } 2112 2113 // Get/set the thread's logging information 2114 CompileLog* log() { return _log; } 2115 void init_log(CompileLog* log) { 2116 // Set once, for good. 2117 assert(_log == NULL, "set only once"); 2118 _log = log; 2119 } 2120 2121 void start_idle_timer() { _idle_time.update(); } 2122 jlong idle_time_millis() { 2123 return TimeHelper::counter_to_millis(_idle_time.ticks_since_update()); 2124 } 2125 2126 #ifndef PRODUCT 2127 private: 2128 IdealGraphPrinter *_ideal_graph_printer; 2129 public: 2130 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } 2131 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } 2132 #endif 2133 2134 // Get/set the thread's current task 2135 CompileTask* task() { return _task; } 2136 void set_task(CompileTask* task) { _task = task; } 2137 }; 2138 2139 inline CompilerThread* CompilerThread::current() { 2140 return JavaThread::current()->as_CompilerThread(); 2141 } 2142 2143 // The active thread queue. It also keeps track of the current used 2144 // thread priorities. 2145 class Threads: AllStatic { 2146 friend class VMStructs; 2147 private: 2148 static JavaThread* _thread_list; 2149 static int _number_of_threads; 2150 static int _number_of_non_daemon_threads; 2151 static int _return_code; 2152 static int _thread_claim_parity; 2153 #ifdef ASSERT 2154 static bool _vm_complete; 2155 static size_t _threads_before_barrier_set; 2156 #endif 2157 2158 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS); 2159 static void initialize_jsr292_core_classes(TRAPS); 2160 2161 public: 2162 // Thread management 2163 // force_daemon is a concession to JNI, where we may need to add a 2164 // thread to the thread list before allocating its thread object 2165 static void add(JavaThread* p, bool force_daemon = false); 2166 static void remove(JavaThread* p); 2167 static void non_java_threads_do(ThreadClosure* tc); 2168 static void java_threads_do(ThreadClosure* tc); 2169 static void java_threads_and_vm_thread_do(ThreadClosure* tc); 2170 static void threads_do(ThreadClosure* tc); 2171 static void possibly_parallel_threads_do(bool is_par, ThreadClosure* tc); 2172 2173 // Initializes the vm and creates the vm thread 2174 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 2175 static void convert_vm_init_libraries_to_agents(); 2176 static void create_vm_init_libraries(); 2177 static void create_vm_init_agents(); 2178 static void shutdown_vm_agents(); 2179 static bool destroy_vm(); 2180 // Supported VM versions via JNI 2181 // Includes JNI_VERSION_1_1 2182 static jboolean is_supported_jni_version_including_1_1(jint version); 2183 // Does not include JNI_VERSION_1_1 2184 static jboolean is_supported_jni_version(jint version); 2185 2186 // The "thread claim parity" provides a way for threads to be claimed 2187 // by parallel worker tasks. 2188 // 2189 // Each thread contains a a "parity" field. A task will claim the 2190 // thread only if its parity field is the same as the global parity, 2191 // which is updated by calling change_thread_claim_parity(). 2192 // 2193 // For this to work change_thread_claim_parity() needs to be called 2194 // exactly once in sequential code before starting parallel tasks 2195 // that should claim threads. 2196 // 2197 // New threads get their parity set to 0 and change_thread_claim_parity() 2198 // never set the global parity to 0. 2199 static int thread_claim_parity() { return _thread_claim_parity; } 2200 static void change_thread_claim_parity(); 2201 static void assert_all_threads_claimed() NOT_DEBUG_RETURN; 2202 2203 // Apply "f->do_oop" to all root oops in all threads. 2204 // This version may only be called by sequential code. 2205 static void oops_do(OopClosure* f, CodeBlobClosure* cf); 2206 // This version may be called by sequential or parallel code. 2207 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf); 2208 2209 // Apply "f->do_oop" to roots in all threads that 2210 // are part of compiled frames 2211 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); 2212 2213 static void convert_hcode_pointers(); 2214 static void restore_hcode_pointers(); 2215 2216 // Sweeper 2217 static void nmethods_do(CodeBlobClosure* cf); 2218 2219 // RedefineClasses support 2220 static void metadata_do(void f(Metadata*)); 2221 static void metadata_handles_do(void f(Metadata*)); 2222 2223 #ifdef ASSERT 2224 static bool is_vm_complete() { return _vm_complete; } 2225 2226 static size_t threads_before_barrier_set() { 2227 return _threads_before_barrier_set; 2228 } 2229 2230 static void inc_threads_before_barrier_set() { 2231 ++_threads_before_barrier_set; 2232 } 2233 #endif // ASSERT 2234 2235 // Verification 2236 static void verify(); 2237 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks, bool print_extended_info); 2238 static void print(bool print_stacks, bool internal_format) { 2239 // this function is only used by debug.cpp 2240 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */, false /* simple format */); 2241 } 2242 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 2243 static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf, 2244 int buflen, bool* found_current); 2245 static void print_threads_compiling(outputStream* st, char* buf, int buflen); 2246 2247 // Get Java threads that are waiting to enter a monitor. 2248 static GrowableArray<JavaThread*>* get_pending_threads(ThreadsList * t_list, 2249 int count, address monitor); 2250 2251 // Get owning Java thread from the monitor's owner field. 2252 static JavaThread *owning_thread_from_monitor_owner(ThreadsList * t_list, 2253 address owner); 2254 2255 // Number of threads on the active threads list 2256 static int number_of_threads() { return _number_of_threads; } 2257 // Number of non-daemon threads on the active threads list 2258 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 2259 2260 // Deoptimizes all frames tied to marked nmethods 2261 static void deoptimized_wrt_marked_nmethods(); 2262 }; 2263 2264 2265 // Thread iterator 2266 class ThreadClosure: public StackObj { 2267 public: 2268 virtual void do_thread(Thread* thread) = 0; 2269 }; 2270 2271 class SignalHandlerMark: public StackObj { 2272 private: 2273 Thread* _thread; 2274 public: 2275 SignalHandlerMark(Thread* t) { 2276 _thread = t; 2277 if (_thread) _thread->enter_signal_handler(); 2278 } 2279 ~SignalHandlerMark() { 2280 if (_thread) _thread->leave_signal_handler(); 2281 _thread = NULL; 2282 } 2283 }; 2284 2285 2286 #endif // SHARE_VM_RUNTIME_THREAD_HPP