1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP 26 #define SHARE_VM_RUNTIME_THREAD_HPP 27 28 #include "gc/shared/threadLocalAllocBuffer.hpp" 29 #include "memory/allocation.hpp" 30 #include "oops/oop.hpp" 31 #include "prims/jni.h" 32 #include "prims/jvmtiExport.hpp" 33 #include "runtime/frame.hpp" 34 #include "runtime/javaFrameAnchor.hpp" 35 #include "runtime/jniHandles.hpp" 36 #include "runtime/mutexLocker.hpp" 37 #include "runtime/os.hpp" 38 #include "runtime/osThread.hpp" 39 #include "runtime/park.hpp" 40 #include "runtime/safepoint.hpp" 41 #include "runtime/stubRoutines.hpp" 42 #include "runtime/threadLocalStorage.hpp" 43 #include "runtime/thread_ext.hpp" 44 #include "runtime/unhandledOops.hpp" 45 #include "trace/traceBackend.hpp" 46 #include "trace/traceMacros.hpp" 47 #include "utilities/exceptions.hpp" 48 #include "utilities/macros.hpp" 49 #include "utilities/top.hpp" 50 #if INCLUDE_ALL_GCS 51 #include "gc/g1/dirtyCardQueue.hpp" 52 #include "gc/shared/satbMarkQueue.hpp" 53 #endif // INCLUDE_ALL_GCS 54 #ifdef TARGET_ARCH_zero 55 # include "stack_zero.hpp" 56 #endif 57 58 class ThreadSafepointState; 59 class ThreadProfiler; 60 61 class JvmtiThreadState; 62 class JvmtiGetLoadedClassesClosure; 63 class ThreadStatistics; 64 class ConcurrentLocksDump; 65 class ParkEvent; 66 class Parker; 67 68 class ciEnv; 69 class CompileThread; 70 class CompileLog; 71 class CompileTask; 72 class CompileQueue; 73 class CompilerCounters; 74 class vframeArray; 75 76 class DeoptResourceMark; 77 class jvmtiDeferredLocalVariableSet; 78 79 class GCTaskQueue; 80 class ThreadClosure; 81 class IdealGraphPrinter; 82 83 class Metadata; 84 template <class T, MEMFLAGS F> class ChunkedList; 85 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer; 86 87 DEBUG_ONLY(class ResourceMark;) 88 89 class WorkerThread; 90 91 // Class hierarchy 92 // - Thread 93 // - NamedThread 94 // - VMThread 95 // - ConcurrentGCThread 96 // - WorkerThread 97 // - GangWorker 98 // - GCTaskThread 99 // - JavaThread 100 // - WatcherThread 101 102 class Thread: public ThreadShadow { 103 friend class VMStructs; 104 friend class JVMCIVMStructs; 105 private: 106 107 #ifndef USE_LIBRARY_BASED_TLS_ONLY 108 // Current thread is maintained as a thread-local variable 109 static THREAD_LOCAL_DECL Thread* _thr_current; 110 #endif 111 112 // Exception handling 113 // (Note: _pending_exception and friends are in ThreadShadow) 114 //oop _pending_exception; // pending exception for current thread 115 // const char* _exception_file; // file information for exception (debugging only) 116 // int _exception_line; // line information for exception (debugging only) 117 protected: 118 // Support for forcing alignment of thread objects for biased locking 119 void* _real_malloc_address; 120 public: 121 void* operator new(size_t size) throw() { return allocate(size, true); } 122 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 123 return allocate(size, false); } 124 void operator delete(void* p); 125 126 protected: 127 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 128 private: 129 130 // *************************************************************** 131 // Suspend and resume support 132 // *************************************************************** 133 // 134 // VM suspend/resume no longer exists - it was once used for various 135 // things including safepoints but was deprecated and finally removed 136 // in Java 7. Because VM suspension was considered "internal" Java-level 137 // suspension was considered "external", and this legacy naming scheme 138 // remains. 139 // 140 // External suspend/resume requests come from JVM_SuspendThread, 141 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI 142 // ResumeThread. External 143 // suspend requests cause _external_suspend to be set and external 144 // resume requests cause _external_suspend to be cleared. 145 // External suspend requests do not nest on top of other external 146 // suspend requests. The higher level APIs reject suspend requests 147 // for already suspended threads. 148 // 149 // The external_suspend 150 // flag is checked by has_special_runtime_exit_condition() and java thread 151 // will self-suspend when handle_special_runtime_exit_condition() is 152 // called. Most uses of the _thread_blocked state in JavaThreads are 153 // considered the same as being externally suspended; if the blocking 154 // condition lifts, the JavaThread will self-suspend. Other places 155 // where VM checks for external_suspend include: 156 // + mutex granting (do not enter monitors when thread is suspended) 157 // + state transitions from _thread_in_native 158 // 159 // In general, java_suspend() does not wait for an external suspend 160 // request to complete. When it returns, the only guarantee is that 161 // the _external_suspend field is true. 162 // 163 // wait_for_ext_suspend_completion() is used to wait for an external 164 // suspend request to complete. External suspend requests are usually 165 // followed by some other interface call that requires the thread to 166 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into 167 // the interface that requires quiescence, we give the JavaThread a 168 // chance to self-suspend before we need it to be quiescent. This 169 // improves overall suspend/query performance. 170 // 171 // _suspend_flags controls the behavior of java_ suspend/resume. 172 // It must be set under the protection of SR_lock. Read from the flag is 173 // OK without SR_lock as long as the value is only used as a hint. 174 // (e.g., check _external_suspend first without lock and then recheck 175 // inside SR_lock and finish the suspension) 176 // 177 // _suspend_flags is also overloaded for other "special conditions" so 178 // that a single check indicates whether any special action is needed 179 // eg. for async exceptions. 180 // ------------------------------------------------------------------- 181 // Notes: 182 // 1. The suspend/resume logic no longer uses ThreadState in OSThread 183 // but we still update its value to keep other part of the system (mainly 184 // JVMTI) happy. ThreadState is legacy code (see notes in 185 // osThread.hpp). 186 // 187 // 2. It would be more natural if set_external_suspend() is private and 188 // part of java_suspend(), but that probably would affect the suspend/query 189 // performance. Need more investigation on this. 190 191 // suspend/resume lock: used for self-suspend 192 Monitor* _SR_lock; 193 194 protected: 195 enum SuspendFlags { 196 // NOTE: avoid using the sign-bit as cc generates different test code 197 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 198 199 _external_suspend = 0x20000000U, // thread is asked to self suspend 200 _ext_suspended = 0x40000000U, // thread has self-suspended 201 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt 202 203 _has_async_exception = 0x00000001U, // there is a pending async exception 204 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock 205 }; 206 207 // various suspension related flags - atomically updated 208 // overloaded for async exception checking in check_special_condition_for_native_trans. 209 volatile uint32_t _suspend_flags; 210 211 private: 212 int _num_nested_signal; 213 214 DEBUG_ONLY(bool _suspendible_thread;) 215 216 public: 217 void enter_signal_handler() { _num_nested_signal++; } 218 void leave_signal_handler() { _num_nested_signal--; } 219 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } 220 221 #ifdef ASSERT 222 void set_suspendible_thread() { 223 _suspendible_thread = true; 224 } 225 226 void clear_suspendible_thread() { 227 _suspendible_thread = false; 228 } 229 230 bool is_suspendible_thread() { return _suspendible_thread; } 231 #endif 232 233 private: 234 // Active_handles points to a block of handles 235 JNIHandleBlock* _active_handles; 236 237 // One-element thread local free list 238 JNIHandleBlock* _free_handle_block; 239 240 // Point to the last handle mark 241 HandleMark* _last_handle_mark; 242 243 // The parity of the last strong_roots iteration in which this thread was 244 // claimed as a task. 245 jint _oops_do_parity; 246 247 public: 248 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 249 HandleMark* last_handle_mark() const { return _last_handle_mark; } 250 private: 251 252 // debug support for checking if code does allow safepoints or not 253 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on 254 // mutex, or blocking on an object synchronizer (Java locking). 255 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases 256 // If !allow_allocation(), then an assertion failure will happen during allocation 257 // (Hence, !allow_safepoint() => !allow_allocation()). 258 // 259 // The two classes NoSafepointVerifier and No_Allocation_Verifier are used to set these counters. 260 // 261 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen 262 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. 263 264 // Used by SkipGCALot class. 265 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 266 267 friend class NoAllocVerifier; 268 friend class NoSafepointVerifier; 269 friend class PauseNoSafepointVerifier; 270 friend class GCLocker; 271 272 ThreadLocalAllocBuffer _tlab; // Thread-local eden 273 jlong _allocated_bytes; // Cumulative number of bytes allocated on 274 // the Java heap 275 276 mutable TRACE_DATA _trace_data; // Thread-local data for tracing 277 278 ThreadExt _ext; 279 280 int _vm_operation_started_count; // VM_Operation support 281 int _vm_operation_completed_count; // VM_Operation support 282 283 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread 284 // is waiting to lock 285 bool _current_pending_monitor_is_from_java; // locking is from Java code 286 287 // ObjectMonitor on which this thread called Object.wait() 288 ObjectMonitor* _current_waiting_monitor; 289 290 // Private thread-local objectmonitor list - a simple cache organized as a SLL. 291 public: 292 ObjectMonitor* omFreeList; 293 int omFreeCount; // length of omFreeList 294 int omFreeProvision; // reload chunk size 295 ObjectMonitor* omInUseList; // SLL to track monitors in circulation 296 int omInUseCount; // length of omInUseList 297 298 #ifdef ASSERT 299 private: 300 bool _visited_for_critical_count; 301 302 public: 303 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } 304 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } 305 #endif 306 307 public: 308 enum { 309 is_definitely_current_thread = true 310 }; 311 312 // Constructor 313 Thread(); 314 virtual ~Thread(); 315 316 // Manage Thread::current() 317 void initialize_thread_current(); 318 private: 319 void clear_thread_current(); // needed for detaching JNI threads 320 321 public: 322 // thread entry point 323 virtual void run(); 324 325 // Testers 326 virtual bool is_VM_thread() const { return false; } 327 virtual bool is_Java_thread() const { return false; } 328 virtual bool is_Compiler_thread() const { return false; } 329 virtual bool is_Code_cache_sweeper_thread() const { return false; } 330 virtual bool is_hidden_from_external_view() const { return false; } 331 virtual bool is_jvmti_agent_thread() const { return false; } 332 // True iff the thread can perform GC operations at a safepoint. 333 // Generally will be true only of VM thread and parallel GC WorkGang 334 // threads. 335 virtual bool is_GC_task_thread() const { return false; } 336 virtual bool is_Watcher_thread() const { return false; } 337 virtual bool is_ConcurrentGC_thread() const { return false; } 338 virtual bool is_Named_thread() const { return false; } 339 virtual bool is_Worker_thread() const { return false; } 340 341 // Can this thread make Java upcalls 342 virtual bool can_call_java() const { return false; } 343 344 // Casts 345 virtual WorkerThread* as_Worker_thread() const { return NULL; } 346 347 virtual char* name() const { return (char*)"Unknown thread"; } 348 349 // Returns the current thread (ASSERTS if NULL) 350 static inline Thread* current(); 351 // Returns the current thread, or NULL if not attached 352 static inline Thread* current_or_null(); 353 // Returns the current thread, or NULL if not attached, and is 354 // safe for use from signal-handlers 355 static inline Thread* current_or_null_safe(); 356 357 // Common thread operations 358 static void set_priority(Thread* thread, ThreadPriority priority); 359 static ThreadPriority get_priority(const Thread* const thread); 360 static void start(Thread* thread); 361 static void interrupt(Thread* thr); 362 static bool is_interrupted(Thread* thr, bool clear_interrupted); 363 364 void set_native_thread_name(const char *name) { 365 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); 366 os::set_native_thread_name(name); 367 } 368 369 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } 370 Monitor* SR_lock() const { return _SR_lock; } 371 372 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } 373 374 inline void set_suspend_flag(SuspendFlags f); 375 inline void clear_suspend_flag(SuspendFlags f); 376 377 inline void set_has_async_exception(); 378 inline void clear_has_async_exception(); 379 380 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } 381 382 inline void set_critical_native_unlock(); 383 inline void clear_critical_native_unlock(); 384 385 // Support for Unhandled Oop detection 386 // Add the field for both, fastdebug and debug, builds to keep 387 // Thread's fields layout the same. 388 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build. 389 #ifdef CHECK_UNHANDLED_OOPS 390 private: 391 UnhandledOops* _unhandled_oops; 392 #elif defined(ASSERT) 393 private: 394 void* _unhandled_oops; 395 #endif 396 #ifdef CHECK_UNHANDLED_OOPS 397 public: 398 UnhandledOops* unhandled_oops() { return _unhandled_oops; } 399 // Mark oop safe for gc. It may be stack allocated but won't move. 400 void allow_unhandled_oop(oop *op) { 401 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); 402 } 403 // Clear oops at safepoint so crashes point to unhandled oop violator 404 void clear_unhandled_oops() { 405 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); 406 } 407 #endif // CHECK_UNHANDLED_OOPS 408 409 public: 410 #ifndef PRODUCT 411 bool skip_gcalot() { return _skip_gcalot; } 412 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 413 #endif 414 415 // Installs a pending exception to be inserted later 416 static void send_async_exception(oop thread_oop, oop java_throwable); 417 418 // Resource area 419 ResourceArea* resource_area() const { return _resource_area; } 420 void set_resource_area(ResourceArea* area) { _resource_area = area; } 421 422 OSThread* osthread() const { return _osthread; } 423 void set_osthread(OSThread* thread) { _osthread = thread; } 424 425 // JNI handle support 426 JNIHandleBlock* active_handles() const { return _active_handles; } 427 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 428 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 429 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 430 431 // Internal handle support 432 HandleArea* handle_area() const { return _handle_area; } 433 void set_handle_area(HandleArea* area) { _handle_area = area; } 434 435 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 436 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 437 438 // Thread-Local Allocation Buffer (TLAB) support 439 ThreadLocalAllocBuffer& tlab() { return _tlab; } 440 void initialize_tlab() { 441 if (UseTLAB) { 442 tlab().initialize(); 443 } 444 } 445 446 jlong allocated_bytes() { return _allocated_bytes; } 447 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 448 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 449 inline jlong cooked_allocated_bytes(); 450 451 TRACE_DEFINE_THREAD_TRACE_DATA_OFFSET; 452 TRACE_DATA* trace_data() const { return &_trace_data; } 453 454 const ThreadExt& ext() const { return _ext; } 455 ThreadExt& ext() { return _ext; } 456 457 // VM operation support 458 int vm_operation_ticket() { return ++_vm_operation_started_count; } 459 int vm_operation_completed_count() { return _vm_operation_completed_count; } 460 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } 461 462 // For tracking the heavyweight monitor the thread is pending on. 463 ObjectMonitor* current_pending_monitor() { 464 return _current_pending_monitor; 465 } 466 void set_current_pending_monitor(ObjectMonitor* monitor) { 467 _current_pending_monitor = monitor; 468 } 469 void set_current_pending_monitor_is_from_java(bool from_java) { 470 _current_pending_monitor_is_from_java = from_java; 471 } 472 bool current_pending_monitor_is_from_java() { 473 return _current_pending_monitor_is_from_java; 474 } 475 476 // For tracking the ObjectMonitor on which this thread called Object.wait() 477 ObjectMonitor* current_waiting_monitor() { 478 return _current_waiting_monitor; 479 } 480 void set_current_waiting_monitor(ObjectMonitor* monitor) { 481 _current_waiting_monitor = monitor; 482 } 483 484 // GC support 485 // Apply "f->do_oop" to all root oops in "this". 486 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive. 487 // Used by JavaThread::oops_do. 488 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 489 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 490 491 // Handles the parallel case for the method below. 492 private: 493 bool claim_oops_do_par_case(int collection_parity); 494 public: 495 // Requires that "collection_parity" is that of the current roots 496 // iteration. If "is_par" is false, sets the parity of "this" to 497 // "collection_parity", and returns "true". If "is_par" is true, 498 // uses an atomic instruction to set the current threads parity to 499 // "collection_parity", if it is not already. Returns "true" iff the 500 // calling thread does the update, this indicates that the calling thread 501 // has claimed the thread's stack as a root groop in the current 502 // collection. 503 bool claim_oops_do(bool is_par, int collection_parity) { 504 if (!is_par) { 505 _oops_do_parity = collection_parity; 506 return true; 507 } else { 508 return claim_oops_do_par_case(collection_parity); 509 } 510 } 511 512 // Sweeper support 513 void nmethods_do(CodeBlobClosure* cf); 514 515 // jvmtiRedefineClasses support 516 void metadata_handles_do(void f(Metadata*)); 517 518 // Used by fast lock support 519 virtual bool is_lock_owned(address adr) const; 520 521 // Check if address is in the stack of the thread (not just for locks). 522 // Warning: the method can only be used on the running thread 523 bool is_in_stack(address adr) const; 524 // Check if address is in the usable part of the stack (excludes protected 525 // guard pages) 526 bool is_in_usable_stack(address adr) const; 527 528 // Sets this thread as starting thread. Returns failure if thread 529 // creation fails due to lack of memory, too many threads etc. 530 bool set_as_starting_thread(); 531 532 protected: 533 // OS data associated with the thread 534 OSThread* _osthread; // Platform-specific thread information 535 536 // Thread local resource area for temporary allocation within the VM 537 ResourceArea* _resource_area; 538 539 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 540 541 // Thread local handle area for allocation of handles within the VM 542 HandleArea* _handle_area; 543 GrowableArray<Metadata*>* _metadata_handles; 544 545 // Support for stack overflow handling, get_thread, etc. 546 address _stack_base; 547 size_t _stack_size; 548 uintptr_t _self_raw_id; // used by get_thread (mutable) 549 int _lgrp_id; 550 551 public: 552 // Stack overflow support 553 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 554 void set_stack_base(address base) { _stack_base = base; } 555 size_t stack_size() const { return _stack_size; } 556 void set_stack_size(size_t size) { _stack_size = size; } 557 address stack_end() const { return stack_base() - stack_size(); } 558 void record_stack_base_and_size(); 559 560 bool on_local_stack(address adr) const { 561 // QQQ this has knowledge of direction, ought to be a stack method 562 return (_stack_base >= adr && adr >= stack_end()); 563 } 564 565 uintptr_t self_raw_id() { return _self_raw_id; } 566 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } 567 568 int lgrp_id() const { return _lgrp_id; } 569 void set_lgrp_id(int value) { _lgrp_id = value; } 570 571 // Printing 572 virtual void print_on(outputStream* st) const; 573 void print() const { print_on(tty); } 574 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 575 576 // Debug-only code 577 #ifdef ASSERT 578 private: 579 // Deadlock detection support for Mutex locks. List of locks own by thread. 580 Monitor* _owned_locks; 581 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 582 // thus the friendship 583 friend class Mutex; 584 friend class Monitor; 585 586 public: 587 void print_owned_locks_on(outputStream* st) const; 588 void print_owned_locks() const { print_owned_locks_on(tty); } 589 Monitor* owned_locks() const { return _owned_locks; } 590 bool owns_locks() const { return owned_locks() != NULL; } 591 bool owns_locks_but_compiled_lock() const; 592 int oops_do_parity() const { return _oops_do_parity; } 593 594 // Deadlock detection 595 bool allow_allocation() { return _allow_allocation_count == 0; } 596 ResourceMark* current_resource_mark() { return _current_resource_mark; } 597 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 598 #endif 599 600 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; 601 602 private: 603 volatile int _jvmti_env_iteration_count; 604 605 public: 606 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 607 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 608 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 609 610 // Code generation 611 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); } 612 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); } 613 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); } 614 615 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); } 616 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); } 617 618 #define TLAB_FIELD_OFFSET(name) \ 619 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } 620 621 TLAB_FIELD_OFFSET(start) 622 TLAB_FIELD_OFFSET(end) 623 TLAB_FIELD_OFFSET(top) 624 TLAB_FIELD_OFFSET(pf_top) 625 TLAB_FIELD_OFFSET(size) // desired_size 626 TLAB_FIELD_OFFSET(refill_waste_limit) 627 TLAB_FIELD_OFFSET(number_of_refills) 628 TLAB_FIELD_OFFSET(fast_refill_waste) 629 TLAB_FIELD_OFFSET(slow_allocations) 630 631 #undef TLAB_FIELD_OFFSET 632 633 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); } 634 635 public: 636 volatile intptr_t _Stalled; 637 volatile int _TypeTag; 638 ParkEvent * _ParkEvent; // for synchronized() 639 ParkEvent * _SleepEvent; // for Thread.sleep 640 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor 641 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease 642 int NativeSyncRecursion; // diagnostic 643 644 volatile int _OnTrap; // Resume-at IP delta 645 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG 646 jint _hashStateX; // thread-specific hashCode generator state 647 jint _hashStateY; 648 jint _hashStateZ; 649 void * _schedctl; 650 651 652 volatile jint rng[4]; // RNG for spin loop 653 654 // Low-level leaf-lock primitives used to implement synchronization 655 // and native monitor-mutex infrastructure. 656 // Not for general synchronization use. 657 static void SpinAcquire(volatile int * Lock, const char * Name); 658 static void SpinRelease(volatile int * Lock); 659 static void muxAcquire(volatile intptr_t * Lock, const char * Name); 660 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev); 661 static void muxRelease(volatile intptr_t * Lock); 662 }; 663 664 // Inline implementation of Thread::current() 665 inline Thread* Thread::current() { 666 Thread* current = current_or_null(); 667 assert(current != NULL, "Thread::current() called on detached thread"); 668 return current; 669 } 670 671 inline Thread* Thread::current_or_null() { 672 #ifndef USE_LIBRARY_BASED_TLS_ONLY 673 return _thr_current; 674 #else 675 return ThreadLocalStorage::thread(); 676 #endif 677 } 678 679 inline Thread* Thread::current_or_null_safe() { 680 return ThreadLocalStorage::thread(); 681 } 682 683 // Name support for threads. non-JavaThread subclasses with multiple 684 // uniquely named instances should derive from this. 685 class NamedThread: public Thread { 686 friend class VMStructs; 687 enum { 688 max_name_len = 64 689 }; 690 private: 691 char* _name; 692 // log JavaThread being processed by oops_do 693 JavaThread* _processed_thread; 694 uint _gc_id; // The current GC id when a thread takes part in GC 695 696 public: 697 NamedThread(); 698 ~NamedThread(); 699 // May only be called once per thread. 700 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); 701 void initialize_named_thread(); 702 virtual bool is_Named_thread() const { return true; } 703 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } 704 JavaThread *processed_thread() { return _processed_thread; } 705 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } 706 virtual void print_on(outputStream* st) const; 707 708 void set_gc_id(uint gc_id) { _gc_id = gc_id; } 709 uint gc_id() { return _gc_id; } 710 }; 711 712 // Worker threads are named and have an id of an assigned work. 713 class WorkerThread: public NamedThread { 714 private: 715 uint _id; 716 public: 717 WorkerThread() : _id(0) { } 718 virtual bool is_Worker_thread() const { return true; } 719 720 virtual WorkerThread* as_Worker_thread() const { 721 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); 722 return (WorkerThread*) this; 723 } 724 725 void set_id(uint work_id) { _id = work_id; } 726 uint id() const { return _id; } 727 }; 728 729 // A single WatcherThread is used for simulating timer interrupts. 730 class WatcherThread: public Thread { 731 friend class VMStructs; 732 public: 733 virtual void run(); 734 735 private: 736 static WatcherThread* _watcher_thread; 737 738 static bool _startable; 739 // volatile due to at least one lock-free read 740 volatile static bool _should_terminate; 741 742 os::WatcherThreadCrashProtection* _crash_protection; 743 public: 744 enum SomeConstants { 745 delay_interval = 10 // interrupt delay in milliseconds 746 }; 747 748 // Constructor 749 WatcherThread(); 750 751 // Tester 752 bool is_Watcher_thread() const { return true; } 753 754 // Printing 755 char* name() const { return (char*)"VM Periodic Task Thread"; } 756 void print_on(outputStream* st) const; 757 void unpark(); 758 759 // Returns the single instance of WatcherThread 760 static WatcherThread* watcher_thread() { return _watcher_thread; } 761 762 // Create and start the single instance of WatcherThread, or stop it on shutdown 763 static void start(); 764 static void stop(); 765 // Only allow start once the VM is sufficiently initialized 766 // Otherwise the first task to enroll will trigger the start 767 static void make_startable(); 768 769 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) { 770 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread"); 771 _crash_protection = crash_protection; 772 } 773 774 bool has_crash_protection() const { return _crash_protection != NULL; } 775 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; } 776 777 private: 778 int sleep() const; 779 }; 780 781 782 class CompilerThread; 783 784 typedef void (*ThreadFunction)(JavaThread*, TRAPS); 785 786 class JavaThread: public Thread { 787 friend class VMStructs; 788 friend class JVMCIVMStructs; 789 friend class WhiteBox; 790 private: 791 JavaThread* _next; // The next thread in the Threads list 792 oop _threadObj; // The Java level thread object 793 794 #ifdef ASSERT 795 private: 796 int _java_call_counter; 797 798 public: 799 int java_call_counter() { return _java_call_counter; } 800 void inc_java_call_counter() { _java_call_counter++; } 801 void dec_java_call_counter() { 802 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 803 _java_call_counter--; 804 } 805 private: // restore original namespace restriction 806 #endif // ifdef ASSERT 807 808 #ifndef PRODUCT 809 public: 810 enum { 811 jump_ring_buffer_size = 16 812 }; 813 private: // restore original namespace restriction 814 #endif 815 816 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 817 818 ThreadFunction _entry_point; 819 820 JNIEnv _jni_environment; 821 822 // Deopt support 823 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 824 825 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we 826 // transition out of native 827 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized 828 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 829 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 830 // Because deoptimization is lazy we must save jvmti requests to set locals 831 // in compiled frames until we deoptimize and we have an interpreter frame. 832 // This holds the pointer to array (yeah like there might be more than one) of 833 // description of compiled vframes that have locals that need to be updated. 834 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; 835 836 // Handshake value for fixing 6243940. We need a place for the i2c 837 // adapter to store the callee Method*. This value is NEVER live 838 // across a gc point so it does NOT have to be gc'd 839 // The handshake is open ended since we can't be certain that it will 840 // be NULLed. This is because we rarely ever see the race and end up 841 // in handle_wrong_method which is the backend of the handshake. See 842 // code in i2c adapters and handle_wrong_method. 843 844 Method* _callee_target; 845 846 // Used to pass back results to the interpreter or generated code running Java code. 847 oop _vm_result; // oop result is GC-preserved 848 Metadata* _vm_result_2; // non-oop result 849 850 // See ReduceInitialCardMarks: this holds the precise space interval of 851 // the most recent slow path allocation for which compiled code has 852 // elided card-marks for performance along the fast-path. 853 MemRegion _deferred_card_mark; 854 855 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 856 // allocated during deoptimization 857 // and by JNI_MonitorEnter/Exit 858 859 // Async. requests support 860 enum AsyncRequests { 861 _no_async_condition = 0, 862 _async_exception, 863 _async_unsafe_access_error 864 }; 865 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request 866 oop _pending_async_exception; 867 868 // Safepoint support 869 public: // Expose _thread_state for SafeFetchInt() 870 volatile JavaThreadState _thread_state; 871 private: 872 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint 873 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 874 875 // JavaThread termination support 876 enum TerminatedTypes { 877 _not_terminated = 0xDEAD - 2, 878 _thread_exiting, // JavaThread::exit() has been called for this thread 879 _thread_terminated, // JavaThread is removed from thread list 880 _vm_exited // JavaThread is still executing native code, but VM is terminated 881 // only VM_Exit can set _vm_exited 882 }; 883 884 // In general a JavaThread's _terminated field transitions as follows: 885 // 886 // _not_terminated => _thread_exiting => _thread_terminated 887 // 888 // _vm_exited is a special value to cover the case of a JavaThread 889 // executing native code after the VM itself is terminated. 890 volatile TerminatedTypes _terminated; 891 // suspend/resume support 892 volatile bool _suspend_equivalent; // Suspend equivalent condition 893 jint _in_deopt_handler; // count of deoptimization 894 // handlers thread is in 895 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 896 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 897 // never locked) when throwing an exception. Used by interpreter only. 898 899 // JNI attach states: 900 enum JNIAttachStates { 901 _not_attaching_via_jni = 1, // thread is not attaching via JNI 902 _attaching_via_jni, // thread is attaching via JNI 903 _attached_via_jni // thread has attached via JNI 904 }; 905 906 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 907 // A native thread that is attaching via JNI starts with a value 908 // of _attaching_via_jni and transitions to _attached_via_jni. 909 volatile JNIAttachStates _jni_attach_state; 910 911 public: 912 // State of the stack guard pages for this thread. 913 enum StackGuardState { 914 stack_guard_unused, // not needed 915 stack_guard_reserved_disabled, 916 stack_guard_yellow_reserved_disabled,// disabled (temporarily) after stack overflow 917 stack_guard_enabled // enabled 918 }; 919 920 private: 921 922 #if INCLUDE_JVMCI 923 // The _pending_* fields below are used to communicate extra information 924 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. 925 926 // Communicates the DeoptReason and DeoptAction of the uncommon trap 927 int _pending_deoptimization; 928 929 // Specifies whether the uncommon trap is to bci 0 of a synchronized method 930 // before the monitor has been acquired. 931 bool _pending_monitorenter; 932 933 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter 934 bool _pending_transfer_to_interpreter; 935 936 // An object that JVMCI compiled code can use to further describe and 937 // uniquely identify the speculative optimization guarded by the uncommon trap 938 oop _pending_failed_speculation; 939 940 // These fields are mutually exclusive in terms of live ranges. 941 union { 942 // Communicates the pc at which the most recent implicit exception occurred 943 // from the signal handler to a deoptimization stub. 944 address _implicit_exception_pc; 945 946 // Communicates an alternative call target to an i2c stub from a JavaCall . 947 address _alternate_call_target; 948 } _jvmci; 949 950 // Support for high precision, thread sensitive counters in JVMCI compiled code. 951 jlong* _jvmci_counters; 952 953 public: 954 static jlong* _jvmci_old_thread_counters; 955 static void collect_counters(typeArrayOop array); 956 private: 957 #endif // INCLUDE_JVMCI 958 959 StackGuardState _stack_guard_state; 960 961 // Precompute the limit of the stack as used in stack overflow checks. 962 // We load it from here to simplify the stack overflow check in assembly. 963 address _stack_overflow_limit; 964 address _reserved_stack_activation; 965 966 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 967 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 968 // code) 969 volatile oop _exception_oop; // Exception thrown in compiled code 970 volatile address _exception_pc; // PC where exception happened 971 volatile address _exception_handler_pc; // PC for handler of exception 972 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 973 974 private: 975 // support for JNI critical regions 976 jint _jni_active_critical; // count of entries into JNI critical region 977 978 // Checked JNI: function name requires exception check 979 char* _pending_jni_exception_check_fn; 980 981 // For deadlock detection. 982 int _depth_first_number; 983 984 // JVMTI PopFrame support 985 // This is set to popframe_pending to signal that top Java frame should be popped immediately 986 int _popframe_condition; 987 988 // If reallocation of scalar replaced objects fails, we throw OOM 989 // and during exception propagation, pop the top 990 // _frames_to_pop_failed_realloc frames, the ones that reference 991 // failed reallocations. 992 int _frames_to_pop_failed_realloc; 993 994 #ifndef PRODUCT 995 int _jmp_ring_index; 996 struct { 997 // We use intptr_t instead of address so debugger doesn't try and display strings 998 intptr_t _target; 999 intptr_t _instruction; 1000 const char* _file; 1001 int _line; 1002 } _jmp_ring[jump_ring_buffer_size]; 1003 #endif // PRODUCT 1004 1005 #if INCLUDE_ALL_GCS 1006 // Support for G1 barriers 1007 1008 SATBMarkQueue _satb_mark_queue; // Thread-local log for SATB barrier. 1009 // Set of all such queues. 1010 static SATBMarkQueueSet _satb_mark_queue_set; 1011 1012 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. 1013 // Set of all such queues. 1014 static DirtyCardQueueSet _dirty_card_queue_set; 1015 1016 void flush_barrier_queues(); 1017 #endif // INCLUDE_ALL_GCS 1018 1019 friend class VMThread; 1020 friend class ThreadWaitTransition; 1021 friend class VM_Exit; 1022 1023 void initialize(); // Initialized the instance variables 1024 1025 public: 1026 // Constructor 1027 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads 1028 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 1029 ~JavaThread(); 1030 1031 #ifdef ASSERT 1032 // verify this JavaThread hasn't be published in the Threads::list yet 1033 void verify_not_published(); 1034 #endif 1035 1036 //JNI functiontable getter/setter for JVMTI jni function table interception API. 1037 void set_jni_functions(struct JNINativeInterface_* functionTable) { 1038 _jni_environment.functions = functionTable; 1039 } 1040 struct JNINativeInterface_* get_jni_functions() { 1041 return (struct JNINativeInterface_ *)_jni_environment.functions; 1042 } 1043 1044 // This function is called at thread creation to allow 1045 // platform specific thread variables to be initialized. 1046 void cache_global_variables(); 1047 1048 // Executes Shutdown.shutdown() 1049 void invoke_shutdown_hooks(); 1050 1051 // Cleanup on thread exit 1052 enum ExitType { 1053 normal_exit, 1054 jni_detach 1055 }; 1056 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 1057 1058 void cleanup_failed_attach_current_thread(); 1059 1060 // Testers 1061 virtual bool is_Java_thread() const { return true; } 1062 virtual bool can_call_java() const { return true; } 1063 1064 // Thread chain operations 1065 JavaThread* next() const { return _next; } 1066 void set_next(JavaThread* p) { _next = p; } 1067 1068 // Thread oop. threadObj() can be NULL for initial JavaThread 1069 // (or for threads attached via JNI) 1070 oop threadObj() const { return _threadObj; } 1071 void set_threadObj(oop p) { _threadObj = p; } 1072 1073 ThreadPriority java_priority() const; // Read from threadObj() 1074 1075 // Prepare thread and add to priority queue. If a priority is 1076 // not specified, use the priority of the thread object. Threads_lock 1077 // must be held while this function is called. 1078 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 1079 void prepare_ext(); 1080 1081 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 1082 address saved_exception_pc() { return _saved_exception_pc; } 1083 1084 1085 ThreadFunction entry_point() const { return _entry_point; } 1086 1087 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1088 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS); 1089 1090 // Last frame anchor routines 1091 1092 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1093 1094 // last_Java_sp 1095 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1096 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1097 1098 // last_Java_pc 1099 1100 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1101 1102 // Safepoint support 1103 #if !(defined(PPC64) || defined(AARCH64)) 1104 JavaThreadState thread_state() const { return _thread_state; } 1105 void set_thread_state(JavaThreadState s) { _thread_state = s; } 1106 #else 1107 // Use membars when accessing volatile _thread_state. See 1108 // Threads::create_vm() for size checks. 1109 inline JavaThreadState thread_state() const; 1110 inline void set_thread_state(JavaThreadState s); 1111 #endif 1112 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } 1113 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } 1114 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } 1115 1116 // thread has called JavaThread::exit() or is terminated 1117 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } 1118 // thread is terminated (no longer on the threads list); we compare 1119 // against the two non-terminated values so that a freed JavaThread 1120 // will also be considered terminated. 1121 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } 1122 void set_terminated(TerminatedTypes t) { _terminated = t; } 1123 // special for Threads::remove() which is static: 1124 void set_terminated_value() { _terminated = _thread_terminated; } 1125 void block_if_vm_exited(); 1126 1127 bool doing_unsafe_access() { return _doing_unsafe_access; } 1128 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1129 1130 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1131 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1132 1133 // Suspend/resume support for JavaThread 1134 private: 1135 inline void set_ext_suspended(); 1136 inline void clear_ext_suspended(); 1137 1138 public: 1139 void java_suspend(); 1140 void java_resume(); 1141 int java_suspend_self(); 1142 1143 void check_and_wait_while_suspended() { 1144 assert(JavaThread::current() == this, "sanity check"); 1145 1146 bool do_self_suspend; 1147 do { 1148 // were we externally suspended while we were waiting? 1149 do_self_suspend = handle_special_suspend_equivalent_condition(); 1150 if (do_self_suspend) { 1151 // don't surprise the thread that suspended us by returning 1152 java_suspend_self(); 1153 set_suspend_equivalent(); 1154 } 1155 } while (do_self_suspend); 1156 } 1157 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); 1158 // Check for async exception in addition to safepoint and suspend request. 1159 static void check_special_condition_for_native_trans(JavaThread *thread); 1160 1161 // Same as check_special_condition_for_native_trans but finishes the 1162 // transition into thread_in_Java mode so that it can potentially 1163 // block. 1164 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); 1165 1166 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); 1167 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { 1168 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1169 // Warning: is_ext_suspend_completed() may temporarily drop the 1170 // SR_lock to allow the thread to reach a stable thread state if 1171 // it is currently in a transient thread state. 1172 return is_ext_suspend_completed(false /* !called_by_wait */, 1173 SuspendRetryDelay, bits); 1174 } 1175 1176 // We cannot allow wait_for_ext_suspend_completion() to run forever or 1177 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally 1178 // passed as the count and delay parameters. Experiments with specific 1179 // calls to wait_for_ext_suspend_completion() can be done by passing 1180 // other values in the code. Experiments with all calls can be done 1181 // via the appropriate -XX options. 1182 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); 1183 1184 inline void set_external_suspend(); 1185 inline void clear_external_suspend(); 1186 1187 inline void set_deopt_suspend(); 1188 inline void clear_deopt_suspend(); 1189 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } 1190 1191 bool is_external_suspend() const { 1192 return (_suspend_flags & _external_suspend) != 0; 1193 } 1194 // Whenever a thread transitions from native to vm/java it must suspend 1195 // if external|deopt suspend is present. 1196 bool is_suspend_after_native() const { 1197 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0; 1198 } 1199 1200 // external suspend request is completed 1201 bool is_ext_suspended() const { 1202 return (_suspend_flags & _ext_suspended) != 0; 1203 } 1204 1205 bool is_external_suspend_with_lock() const { 1206 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1207 return is_external_suspend(); 1208 } 1209 1210 // Special method to handle a pending external suspend request 1211 // when a suspend equivalent condition lifts. 1212 bool handle_special_suspend_equivalent_condition() { 1213 assert(is_suspend_equivalent(), 1214 "should only be called in a suspend equivalence condition"); 1215 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1216 bool ret = is_external_suspend(); 1217 if (!ret) { 1218 // not about to self-suspend so clear suspend equivalence 1219 clear_suspend_equivalent(); 1220 } 1221 // implied else: 1222 // We have a pending external suspend request so we leave the 1223 // suspend_equivalent flag set until java_suspend_self() sets 1224 // the ext_suspended flag and clears the suspend_equivalent 1225 // flag. This insures that wait_for_ext_suspend_completion() 1226 // will return consistent values. 1227 return ret; 1228 } 1229 1230 // utility methods to see if we are doing some kind of suspension 1231 bool is_being_ext_suspended() const { 1232 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1233 return is_ext_suspended() || is_external_suspend(); 1234 } 1235 1236 bool is_suspend_equivalent() const { return _suspend_equivalent; } 1237 1238 void set_suspend_equivalent() { _suspend_equivalent = true; } 1239 void clear_suspend_equivalent() { _suspend_equivalent = false; } 1240 1241 // Thread.stop support 1242 void send_thread_stop(oop throwable); 1243 AsyncRequests clear_special_runtime_exit_condition() { 1244 AsyncRequests x = _special_runtime_exit_condition; 1245 _special_runtime_exit_condition = _no_async_condition; 1246 return x; 1247 } 1248 1249 // Are any async conditions present? 1250 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } 1251 1252 void check_and_handle_async_exceptions(bool check_unsafe_error = true); 1253 1254 // these next two are also used for self-suspension and async exception support 1255 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1256 1257 // Return true if JavaThread has an asynchronous condition or 1258 // if external suspension is requested. 1259 bool has_special_runtime_exit_condition() { 1260 // We call is_external_suspend() last since external suspend should 1261 // be less common. Because we don't use is_external_suspend_with_lock 1262 // it is possible that we won't see an asynchronous external suspend 1263 // request that has just gotten started, i.e., SR_lock grabbed but 1264 // _external_suspend field change either not made yet or not visible 1265 // yet. However, this is okay because the request is asynchronous and 1266 // we will see the new flag value the next time through. It's also 1267 // possible that the external suspend request is dropped after 1268 // we have checked is_external_suspend(), we will recheck its value 1269 // under SR_lock in java_suspend_self(). 1270 return (_special_runtime_exit_condition != _no_async_condition) || 1271 is_external_suspend() || is_deopt_suspend(); 1272 } 1273 1274 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } 1275 1276 inline void set_pending_async_exception(oop e); 1277 1278 // Fast-locking support 1279 bool is_lock_owned(address adr) const; 1280 1281 // Accessors for vframe array top 1282 // The linked list of vframe arrays are sorted on sp. This means when we 1283 // unpack the head must contain the vframe array to unpack. 1284 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1285 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1286 1287 // Side structure for deferring update of java frame locals until deopt occurs 1288 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } 1289 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } 1290 1291 // These only really exist to make debugging deopt problems simpler 1292 1293 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1294 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1295 1296 // The special resourceMark used during deoptimization 1297 1298 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1299 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1300 1301 intptr_t* must_deopt_id() { return _must_deopt_id; } 1302 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } 1303 void clear_must_deopt_id() { _must_deopt_id = NULL; } 1304 1305 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } 1306 nmethod* deopt_nmethod() { return _deopt_nmethod; } 1307 1308 Method* callee_target() const { return _callee_target; } 1309 void set_callee_target (Method* x) { _callee_target = x; } 1310 1311 // Oop results of vm runtime calls 1312 oop vm_result() const { return _vm_result; } 1313 void set_vm_result (oop x) { _vm_result = x; } 1314 1315 Metadata* vm_result_2() const { return _vm_result_2; } 1316 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1317 1318 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1319 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1320 1321 #if INCLUDE_JVMCI 1322 int pending_deoptimization() const { return _pending_deoptimization; } 1323 oop pending_failed_speculation() const { return _pending_failed_speculation; } 1324 bool has_pending_monitorenter() const { return _pending_monitorenter; } 1325 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } 1326 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } 1327 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; } 1328 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } 1329 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; } 1330 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; } 1331 #endif // INCLUDE_JVMCI 1332 1333 // Exception handling for compiled methods 1334 oop exception_oop() const { return _exception_oop; } 1335 address exception_pc() const { return _exception_pc; } 1336 address exception_handler_pc() const { return _exception_handler_pc; } 1337 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1338 1339 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); } 1340 void set_exception_pc(address a) { _exception_pc = a; } 1341 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1342 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1343 1344 void clear_exception_oop_and_pc() { 1345 set_exception_oop(NULL); 1346 set_exception_pc(NULL); 1347 } 1348 1349 // Stack overflow support 1350 // 1351 // (small addresses) 1352 // 1353 // -- <-- stack_end() --- 1354 // | | 1355 // | red pages | 1356 // | | 1357 // -- <-- stack_red_zone_base() | 1358 // | | 1359 // | guard 1360 // | yellow pages zone 1361 // | | 1362 // | | 1363 // -- <-- stack_yellow_zone_base() | 1364 // | | 1365 // | | 1366 // | reserved pages | 1367 // | | 1368 // -- <-- stack_reserved_zone_base() --- --- 1369 // /|\ shadow 1370 // | zone 1371 // \|/ size 1372 // some untouched memory --- <-- stack_overflow_limit() 1373 // 1374 // 1375 // -- 1376 // | 1377 // | shadow zone 1378 // | 1379 // -- 1380 // x frame n 1381 // -- 1382 // x frame n-1 1383 // x 1384 // -- 1385 // ... 1386 // 1387 // -- 1388 // x frame 0 1389 // -- <-- stack_base() 1390 // 1391 // (large addresses) 1392 // 1393 1394 private: 1395 // These values are derived from flags StackRedPages, StackYellowPages, 1396 // StackReservedPages and StackShadowPages. The zone size is determined 1397 // ergonomically if page_size > 4K. 1398 static size_t _stack_red_zone_size; 1399 static size_t _stack_yellow_zone_size; 1400 static size_t _stack_reserved_zone_size; 1401 static size_t _stack_shadow_zone_size; 1402 public: 1403 inline size_t stack_available(address cur_sp); 1404 1405 static size_t stack_red_zone_size() { 1406 assert(_stack_red_zone_size > 0, "Don't call this before the field is initialized."); 1407 return _stack_red_zone_size; 1408 } 1409 static void set_stack_red_zone_size(size_t s) { 1410 assert(is_size_aligned(s, os::vm_page_size()), 1411 "We can not protect if the red zone size is not page aligned."); 1412 assert(_stack_red_zone_size == 0, "This should be called only once."); 1413 _stack_red_zone_size = s; 1414 } 1415 address stack_red_zone_base() { 1416 return (address)(stack_end() + stack_red_zone_size()); 1417 } 1418 bool in_stack_red_zone(address a) { 1419 return a <= stack_red_zone_base() && a >= stack_end(); 1420 } 1421 1422 static size_t stack_yellow_zone_size() { 1423 assert(_stack_yellow_zone_size > 0, "Don't call this before the field is initialized."); 1424 return _stack_yellow_zone_size; 1425 } 1426 static void set_stack_yellow_zone_size(size_t s) { 1427 assert(is_size_aligned(s, os::vm_page_size()), 1428 "We can not protect if the yellow zone size is not page aligned."); 1429 assert(_stack_yellow_zone_size == 0, "This should be called only once."); 1430 _stack_yellow_zone_size = s; 1431 } 1432 1433 static size_t stack_reserved_zone_size() { 1434 // _stack_reserved_zone_size may be 0. This indicates the feature is off. 1435 return _stack_reserved_zone_size; 1436 } 1437 static void set_stack_reserved_zone_size(size_t s) { 1438 assert(is_size_aligned(s, os::vm_page_size()), 1439 "We can not protect if the reserved zone size is not page aligned."); 1440 assert(_stack_reserved_zone_size == 0, "This should be called only once."); 1441 _stack_reserved_zone_size = s; 1442 } 1443 address stack_reserved_zone_base() { 1444 return (address)(stack_end() + 1445 (stack_red_zone_size() + stack_yellow_zone_size() + stack_reserved_zone_size())); 1446 } 1447 bool in_stack_reserved_zone(address a) { 1448 return (a <= stack_reserved_zone_base()) && 1449 (a >= (address)((intptr_t)stack_reserved_zone_base() - stack_reserved_zone_size())); 1450 } 1451 1452 static size_t stack_yellow_reserved_zone_size() { 1453 return _stack_yellow_zone_size + _stack_reserved_zone_size; 1454 } 1455 bool in_stack_yellow_reserved_zone(address a) { 1456 return (a <= stack_reserved_zone_base()) && (a >= stack_red_zone_base()); 1457 } 1458 1459 // Size of red + yellow + reserved zones. 1460 static size_t stack_guard_zone_size() { 1461 return stack_red_zone_size() + stack_yellow_reserved_zone_size(); 1462 } 1463 1464 static size_t stack_shadow_zone_size() { 1465 assert(_stack_shadow_zone_size > 0, "Don't call this before the field is initialized."); 1466 return _stack_shadow_zone_size; 1467 } 1468 static void set_stack_shadow_zone_size(size_t s) { 1469 // The shadow area is not allocated or protected, so 1470 // it needs not be page aligned. 1471 // But the stack bang currently assumes that it is a 1472 // multiple of page size. This guarantees that the bang 1473 // loop touches all pages in the shadow zone. 1474 // This can be guaranteed differently, as well. E.g., if 1475 // the page size is a multiple of 4K, banging in 4K steps 1476 // suffices to touch all pages. (Some pages are banged 1477 // several times, though.) 1478 assert(is_size_aligned(s, os::vm_page_size()), 1479 "Stack bang assumes multiple of page size."); 1480 assert(_stack_shadow_zone_size == 0, "This should be called only once."); 1481 _stack_shadow_zone_size = s; 1482 } 1483 1484 void create_stack_guard_pages(); 1485 void remove_stack_guard_pages(); 1486 1487 void enable_stack_reserved_zone(); 1488 void disable_stack_reserved_zone(); 1489 void enable_stack_yellow_reserved_zone(); 1490 void disable_stack_yellow_reserved_zone(); 1491 void enable_stack_red_zone(); 1492 void disable_stack_red_zone(); 1493 1494 inline bool stack_guard_zone_unused(); 1495 inline bool stack_yellow_reserved_zone_disabled(); 1496 inline bool stack_reserved_zone_disabled(); 1497 inline bool stack_guards_enabled(); 1498 1499 address reserved_stack_activation() const { return _reserved_stack_activation; } 1500 void set_reserved_stack_activation(address addr) { 1501 assert(_reserved_stack_activation == stack_base() 1502 || _reserved_stack_activation == NULL 1503 || addr == stack_base(), "Must not be set twice"); 1504 _reserved_stack_activation = addr; 1505 } 1506 1507 // Attempt to reguard the stack after a stack overflow may have occurred. 1508 // Returns true if (a) guard pages are not needed on this thread, (b) the 1509 // pages are already guarded, or (c) the pages were successfully reguarded. 1510 // Returns false if there is not enough stack space to reguard the pages, in 1511 // which case the caller should unwind a frame and try again. The argument 1512 // should be the caller's (approximate) sp. 1513 bool reguard_stack(address cur_sp); 1514 // Similar to above but see if current stackpoint is out of the guard area 1515 // and reguard if possible. 1516 bool reguard_stack(void); 1517 1518 address stack_overflow_limit() { return _stack_overflow_limit; } 1519 void set_stack_overflow_limit() { 1520 _stack_overflow_limit = stack_end() + 1521 (JavaThread::stack_guard_zone_size() + 1522 JavaThread::stack_shadow_zone_size()); 1523 } 1524 1525 // Misc. accessors/mutators 1526 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1527 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1528 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1529 1530 #ifndef PRODUCT 1531 void record_jump(address target, address instr, const char* file, int line); 1532 #endif // PRODUCT 1533 1534 // For assembly stub generation 1535 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } 1536 #ifndef PRODUCT 1537 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); } 1538 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); } 1539 #endif // PRODUCT 1540 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } 1541 static ByteSize last_Java_sp_offset() { 1542 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1543 } 1544 static ByteSize last_Java_pc_offset() { 1545 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1546 } 1547 static ByteSize frame_anchor_offset() { 1548 return byte_offset_of(JavaThread, _anchor); 1549 } 1550 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } 1551 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } 1552 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } 1553 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } 1554 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } 1555 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } 1556 #if INCLUDE_JVMCI 1557 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); } 1558 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); } 1559 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); } 1560 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); } 1561 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); } 1562 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); } 1563 #endif // INCLUDE_JVMCI 1564 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } 1565 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } 1566 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1567 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } 1568 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1569 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); } 1570 static ByteSize reserved_stack_activation_offset() { return byte_offset_of(JavaThread, _reserved_stack_activation); } 1571 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } 1572 1573 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1574 static ByteSize should_post_on_exceptions_flag_offset() { 1575 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1576 } 1577 1578 #if INCLUDE_ALL_GCS 1579 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } 1580 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } 1581 #endif // INCLUDE_ALL_GCS 1582 1583 // Returns the jni environment for this thread 1584 JNIEnv* jni_environment() { return &_jni_environment; } 1585 1586 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1587 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1588 // Only return NULL if thread is off the thread list; starting to 1589 // exit should not return NULL. 1590 if (thread_from_jni_env->is_terminated()) { 1591 thread_from_jni_env->block_if_vm_exited(); 1592 return NULL; 1593 } else { 1594 return thread_from_jni_env; 1595 } 1596 } 1597 1598 // JNI critical regions. These can nest. 1599 bool in_critical() { return _jni_active_critical > 0; } 1600 bool in_last_critical() { return _jni_active_critical == 1; } 1601 void enter_critical() { 1602 assert(Thread::current() == this || 1603 (Thread::current()->is_VM_thread() && 1604 SafepointSynchronize::is_synchronizing()), 1605 "this must be current thread or synchronizing"); 1606 _jni_active_critical++; 1607 } 1608 void exit_critical() { 1609 assert(Thread::current() == this, "this must be current thread"); 1610 _jni_active_critical--; 1611 assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); 1612 } 1613 1614 // Checked JNI, is the programmer required to check for exceptions, specify which function name 1615 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1616 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1617 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1618 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1619 1620 // For deadlock detection 1621 int depth_first_number() { return _depth_first_number; } 1622 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1623 1624 private: 1625 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1626 1627 public: 1628 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1629 void add_monitor_chunk(MonitorChunk* chunk); 1630 void remove_monitor_chunk(MonitorChunk* chunk); 1631 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1632 void inc_in_deopt_handler() { _in_deopt_handler++; } 1633 void dec_in_deopt_handler() { 1634 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1635 if (_in_deopt_handler > 0) { // robustness 1636 _in_deopt_handler--; 1637 } 1638 } 1639 1640 private: 1641 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1642 1643 public: 1644 1645 // Frame iteration; calls the function f for all frames on the stack 1646 void frames_do(void f(frame*, const RegisterMap*)); 1647 1648 // Memory operations 1649 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1650 1651 // Sweeper operations 1652 void nmethods_do(CodeBlobClosure* cf); 1653 1654 // RedefineClasses Support 1655 void metadata_do(void f(Metadata*)); 1656 1657 // Misc. operations 1658 char* name() const { return (char*)get_thread_name(); } 1659 void print_on(outputStream* st) const; 1660 void print_value(); 1661 void print_thread_state_on(outputStream*) const PRODUCT_RETURN; 1662 void print_thread_state() const PRODUCT_RETURN; 1663 void print_on_error(outputStream* st, char* buf, int buflen) const; 1664 void print_name_on_error(outputStream* st, char* buf, int buflen) const; 1665 void verify(); 1666 const char* get_thread_name() const; 1667 private: 1668 // factor out low-level mechanics for use in both normal and error cases 1669 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1670 public: 1671 const char* get_threadgroup_name() const; 1672 const char* get_parent_name() const; 1673 1674 // Accessing frames 1675 frame last_frame() { 1676 _anchor.make_walkable(this); 1677 return pd_last_frame(); 1678 } 1679 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1680 1681 // Returns method at 'depth' java or native frames down the stack 1682 // Used for security checks 1683 Klass* security_get_caller_class(int depth); 1684 1685 // Print stack trace in external format 1686 void print_stack_on(outputStream* st); 1687 void print_stack() { print_stack_on(tty); } 1688 1689 // Print stack traces in various internal formats 1690 void trace_stack() PRODUCT_RETURN; 1691 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1692 void trace_frames() PRODUCT_RETURN; 1693 void trace_oops() PRODUCT_RETURN; 1694 1695 // Print an annotated view of the stack frames 1696 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1697 void validate_frame_layout() { 1698 print_frame_layout(0, true); 1699 } 1700 1701 // Returns the number of stack frames on the stack 1702 int depth() const; 1703 1704 // Function for testing deoptimization 1705 void deoptimize(); 1706 void make_zombies(); 1707 1708 void deoptimized_wrt_marked_nmethods(); 1709 1710 // Profiling operation (see fprofile.cpp) 1711 public: 1712 bool profile_last_Java_frame(frame* fr); 1713 1714 private: 1715 ThreadProfiler* _thread_profiler; 1716 private: 1717 friend class FlatProfiler; // uses both [gs]et_thread_profiler. 1718 friend class FlatProfilerTask; // uses get_thread_profiler. 1719 friend class ThreadProfilerMark; // uses get_thread_profiler. 1720 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } 1721 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { 1722 ThreadProfiler* result = _thread_profiler; 1723 _thread_profiler = tp; 1724 return result; 1725 } 1726 1727 public: 1728 // Returns the running thread as a JavaThread 1729 static inline JavaThread* current(); 1730 1731 // Returns the active Java thread. Do not use this if you know you are calling 1732 // from a JavaThread, as it's slower than JavaThread::current. If called from 1733 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1734 // operation. You may not want that either. 1735 static JavaThread* active(); 1736 1737 inline CompilerThread* as_CompilerThread(); 1738 1739 public: 1740 virtual void run(); 1741 void thread_main_inner(); 1742 1743 private: 1744 // PRIVILEGED STACK 1745 PrivilegedElement* _privileged_stack_top; 1746 GrowableArray<oop>* _array_for_gc; 1747 public: 1748 1749 // Returns the privileged_stack information. 1750 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } 1751 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } 1752 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } 1753 1754 public: 1755 // Thread local information maintained by JVMTI. 1756 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1757 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1758 // getter is used to get this JavaThread's JvmtiThreadState if it has 1759 // one which means NULL can be returned. JvmtiThreadState::state_for() 1760 // is used to get the specified JavaThread's JvmtiThreadState if it has 1761 // one or it allocates a new JvmtiThreadState for the JavaThread and 1762 // returns it. JvmtiThreadState::state_for() will return NULL only if 1763 // the specified JavaThread is exiting. 1764 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1765 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1766 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } 1767 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } 1768 1769 // JVMTI PopFrame support 1770 // Setting and clearing popframe_condition 1771 // All of these enumerated values are bits. popframe_pending 1772 // indicates that a PopFrame() has been requested and not yet been 1773 // completed. popframe_processing indicates that that PopFrame() is in 1774 // the process of being completed. popframe_force_deopt_reexecution_bit 1775 // indicates that special handling is required when returning to a 1776 // deoptimized caller. 1777 enum PopCondition { 1778 popframe_inactive = 0x00, 1779 popframe_pending_bit = 0x01, 1780 popframe_processing_bit = 0x02, 1781 popframe_force_deopt_reexecution_bit = 0x04 1782 }; 1783 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1784 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1785 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1786 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1787 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1788 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1789 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1790 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1791 #ifdef CC_INTERP 1792 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } 1793 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } 1794 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1795 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1796 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1797 #endif 1798 1799 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1800 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1801 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1802 1803 private: 1804 // Saved incoming arguments to popped frame. 1805 // Used only when popped interpreted frame returns to deoptimized frame. 1806 void* _popframe_preserved_args; 1807 int _popframe_preserved_args_size; 1808 1809 public: 1810 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1811 void* popframe_preserved_args(); 1812 ByteSize popframe_preserved_args_size(); 1813 WordSize popframe_preserved_args_size_in_words(); 1814 void popframe_free_preserved_args(); 1815 1816 1817 private: 1818 JvmtiThreadState *_jvmti_thread_state; 1819 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; 1820 1821 // Used by the interpreter in fullspeed mode for frame pop, method 1822 // entry, method exit and single stepping support. This field is 1823 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. 1824 // It can be set to zero asynchronously (i.e., without a VM operation 1825 // or a lock) so we have to be very careful. 1826 int _interp_only_mode; 1827 1828 public: 1829 // used by the interpreter for fullspeed debugging support (see above) 1830 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1831 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1832 int get_interp_only_mode() { return _interp_only_mode; } 1833 void increment_interp_only_mode() { ++_interp_only_mode; } 1834 void decrement_interp_only_mode() { --_interp_only_mode; } 1835 1836 // support for cached flag that indicates whether exceptions need to be posted for this thread 1837 // if this is false, we can avoid deoptimizing when events are thrown 1838 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1839 private: 1840 int _should_post_on_exceptions_flag; 1841 1842 public: 1843 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1844 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1845 1846 private: 1847 ThreadStatistics *_thread_stat; 1848 1849 public: 1850 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1851 1852 // Return a blocker object for which this thread is blocked parking. 1853 oop current_park_blocker(); 1854 1855 private: 1856 static size_t _stack_size_at_create; 1857 1858 public: 1859 static inline size_t stack_size_at_create(void) { 1860 return _stack_size_at_create; 1861 } 1862 static inline void set_stack_size_at_create(size_t value) { 1863 _stack_size_at_create = value; 1864 } 1865 1866 #if INCLUDE_ALL_GCS 1867 // SATB marking queue support 1868 SATBMarkQueue& satb_mark_queue() { return _satb_mark_queue; } 1869 static SATBMarkQueueSet& satb_mark_queue_set() { 1870 return _satb_mark_queue_set; 1871 } 1872 1873 // Dirty card queue support 1874 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } 1875 static DirtyCardQueueSet& dirty_card_queue_set() { 1876 return _dirty_card_queue_set; 1877 } 1878 #endif // INCLUDE_ALL_GCS 1879 1880 // This method initializes the SATB and dirty card queues before a 1881 // JavaThread is added to the Java thread list. Right now, we don't 1882 // have to do anything to the dirty card queue (it should have been 1883 // activated when the thread was created), but we have to activate 1884 // the SATB queue if the thread is created while a marking cycle is 1885 // in progress. The activation / de-activation of the SATB queues at 1886 // the beginning / end of a marking cycle is done during safepoints 1887 // so we have to make sure this method is called outside one to be 1888 // able to safely read the active field of the SATB queue set. Right 1889 // now, it is called just before the thread is added to the Java 1890 // thread list in the Threads::add() method. That method is holding 1891 // the Threads_lock which ensures we are outside a safepoint. We 1892 // cannot do the obvious and set the active field of the SATB queue 1893 // when the thread is created given that, in some cases, safepoints 1894 // might happen between the JavaThread constructor being called and the 1895 // thread being added to the Java thread list (an example of this is 1896 // when the structure for the DestroyJavaVM thread is created). 1897 #if INCLUDE_ALL_GCS 1898 void initialize_queues(); 1899 #else // INCLUDE_ALL_GCS 1900 void initialize_queues() { } 1901 #endif // INCLUDE_ALL_GCS 1902 1903 // Machine dependent stuff 1904 #ifdef TARGET_OS_ARCH_linux_x86 1905 # include "thread_linux_x86.hpp" 1906 #endif 1907 #ifdef TARGET_OS_ARCH_linux_sparc 1908 # include "thread_linux_sparc.hpp" 1909 #endif 1910 #ifdef TARGET_OS_ARCH_linux_zero 1911 # include "thread_linux_zero.hpp" 1912 #endif 1913 #ifdef TARGET_OS_ARCH_solaris_x86 1914 # include "thread_solaris_x86.hpp" 1915 #endif 1916 #ifdef TARGET_OS_ARCH_solaris_sparc 1917 # include "thread_solaris_sparc.hpp" 1918 #endif 1919 #ifdef TARGET_OS_ARCH_windows_x86 1920 # include "thread_windows_x86.hpp" 1921 #endif 1922 #ifdef TARGET_OS_ARCH_linux_arm 1923 # include "thread_linux_arm.hpp" 1924 #endif 1925 #ifdef TARGET_OS_ARCH_linux_ppc 1926 # include "thread_linux_ppc.hpp" 1927 #endif 1928 #ifdef TARGET_OS_ARCH_linux_aarch64 1929 # include "thread_linux_aarch64.hpp" 1930 #endif 1931 #ifdef TARGET_OS_ARCH_aix_ppc 1932 # include "thread_aix_ppc.hpp" 1933 #endif 1934 #ifdef TARGET_OS_ARCH_bsd_x86 1935 # include "thread_bsd_x86.hpp" 1936 #endif 1937 #ifdef TARGET_OS_ARCH_bsd_zero 1938 # include "thread_bsd_zero.hpp" 1939 #endif 1940 1941 1942 public: 1943 void set_blocked_on_compilation(bool value) { 1944 _blocked_on_compilation = value; 1945 } 1946 1947 bool blocked_on_compilation() { 1948 return _blocked_on_compilation; 1949 } 1950 protected: 1951 bool _blocked_on_compilation; 1952 1953 1954 // JSR166 per-thread parker 1955 private: 1956 Parker* _parker; 1957 public: 1958 Parker* parker() { return _parker; } 1959 1960 // Biased locking support 1961 private: 1962 GrowableArray<MonitorInfo*>* _cached_monitor_info; 1963 public: 1964 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 1965 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 1966 1967 // clearing/querying jni attach status 1968 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1969 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1970 inline void set_done_attaching_via_jni(); 1971 }; 1972 1973 // Inline implementation of JavaThread::current 1974 inline JavaThread* JavaThread::current() { 1975 Thread* thread = Thread::current(); 1976 assert(thread->is_Java_thread(), "just checking"); 1977 return (JavaThread*)thread; 1978 } 1979 1980 inline CompilerThread* JavaThread::as_CompilerThread() { 1981 assert(is_Compiler_thread(), "just checking"); 1982 return (CompilerThread*)this; 1983 } 1984 1985 // Dedicated thread to sweep the code cache 1986 class CodeCacheSweeperThread : public JavaThread { 1987 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper 1988 public: 1989 CodeCacheSweeperThread(); 1990 // Track the nmethod currently being scanned by the sweeper 1991 void set_scanned_nmethod(nmethod* nm) { 1992 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value"); 1993 _scanned_nmethod = nm; 1994 } 1995 1996 // Hide sweeper thread from external view. 1997 bool is_hidden_from_external_view() const { return true; } 1998 1999 bool is_Code_cache_sweeper_thread() const { return true; } 2000 // GC support 2001 // Apply "f->do_oop" to all root oops in "this". 2002 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 2003 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 2004 }; 2005 2006 // A thread used for Compilation. 2007 class CompilerThread : public JavaThread { 2008 friend class VMStructs; 2009 private: 2010 CompilerCounters* _counters; 2011 2012 ciEnv* _env; 2013 CompileLog* _log; 2014 CompileTask* _task; 2015 CompileQueue* _queue; 2016 BufferBlob* _buffer_blob; 2017 2018 AbstractCompiler* _compiler; 2019 2020 public: 2021 2022 static CompilerThread* current(); 2023 2024 CompilerThread(CompileQueue* queue, CompilerCounters* counters); 2025 2026 bool is_Compiler_thread() const { return true; } 2027 2028 virtual bool can_call_java() const; 2029 2030 // Hide native compiler threads from external view. 2031 bool is_hidden_from_external_view() const { return !can_call_java(); } 2032 2033 void set_compiler(AbstractCompiler* c) { _compiler = c; } 2034 AbstractCompiler* compiler() const { return _compiler; } 2035 2036 CompileQueue* queue() const { return _queue; } 2037 CompilerCounters* counters() const { return _counters; } 2038 2039 // Get/set the thread's compilation environment. 2040 ciEnv* env() { return _env; } 2041 void set_env(ciEnv* env) { _env = env; } 2042 2043 BufferBlob* get_buffer_blob() const { return _buffer_blob; } 2044 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; } 2045 2046 // Get/set the thread's logging information 2047 CompileLog* log() { return _log; } 2048 void init_log(CompileLog* log) { 2049 // Set once, for good. 2050 assert(_log == NULL, "set only once"); 2051 _log = log; 2052 } 2053 2054 #ifndef PRODUCT 2055 private: 2056 IdealGraphPrinter *_ideal_graph_printer; 2057 public: 2058 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } 2059 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } 2060 #endif 2061 2062 // Get/set the thread's current task 2063 CompileTask* task() { return _task; } 2064 void set_task(CompileTask* task) { _task = task; } 2065 }; 2066 2067 inline CompilerThread* CompilerThread::current() { 2068 return JavaThread::current()->as_CompilerThread(); 2069 } 2070 2071 // The active thread queue. It also keeps track of the current used 2072 // thread priorities. 2073 class Threads: AllStatic { 2074 friend class VMStructs; 2075 private: 2076 static JavaThread* _thread_list; 2077 static int _number_of_threads; 2078 static int _number_of_non_daemon_threads; 2079 static int _return_code; 2080 static int _thread_claim_parity; 2081 #ifdef ASSERT 2082 static bool _vm_complete; 2083 #endif 2084 2085 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS); 2086 static void initialize_jsr292_core_classes(TRAPS); 2087 public: 2088 // Thread management 2089 // force_daemon is a concession to JNI, where we may need to add a 2090 // thread to the thread list before allocating its thread object 2091 static void add(JavaThread* p, bool force_daemon = false); 2092 static void remove(JavaThread* p); 2093 static bool includes(JavaThread* p); 2094 static JavaThread* first() { return _thread_list; } 2095 static void threads_do(ThreadClosure* tc); 2096 2097 // Initializes the vm and creates the vm thread 2098 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 2099 static void convert_vm_init_libraries_to_agents(); 2100 static void create_vm_init_libraries(); 2101 static void create_vm_init_agents(); 2102 static void shutdown_vm_agents(); 2103 static bool destroy_vm(); 2104 // Supported VM versions via JNI 2105 // Includes JNI_VERSION_1_1 2106 static jboolean is_supported_jni_version_including_1_1(jint version); 2107 // Does not include JNI_VERSION_1_1 2108 static jboolean is_supported_jni_version(jint version); 2109 2110 // The "thread claim parity" provides a way for threads to be claimed 2111 // by parallel worker tasks. 2112 // 2113 // Each thread contains a a "parity" field. A task will claim the 2114 // thread only if its parity field is the same as the global parity, 2115 // which is updated by calling change_thread_claim_parity(). 2116 // 2117 // For this to work change_thread_claim_parity() needs to be called 2118 // exactly once in sequential code before starting parallel tasks 2119 // that should claim threads. 2120 // 2121 // New threads get their parity set to 0 and change_thread_claim_parity() 2122 // never set the global parity to 0. 2123 static int thread_claim_parity() { return _thread_claim_parity; } 2124 static void change_thread_claim_parity(); 2125 static void assert_all_threads_claimed() NOT_DEBUG_RETURN; 2126 2127 // Apply "f->do_oop" to all root oops in all threads. 2128 // This version may only be called by sequential code. 2129 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 2130 // This version may be called by sequential or parallel code. 2131 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 2132 // This creates a list of GCTasks, one per thread. 2133 static void create_thread_roots_tasks(GCTaskQueue* q); 2134 // This creates a list of GCTasks, one per thread, for marking objects. 2135 static void create_thread_roots_marking_tasks(GCTaskQueue* q); 2136 2137 // Apply "f->do_oop" to roots in all threads that 2138 // are part of compiled frames 2139 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); 2140 2141 static void convert_hcode_pointers(); 2142 static void restore_hcode_pointers(); 2143 2144 // Sweeper 2145 static void nmethods_do(CodeBlobClosure* cf); 2146 2147 // RedefineClasses support 2148 static void metadata_do(void f(Metadata*)); 2149 static void metadata_handles_do(void f(Metadata*)); 2150 2151 #ifdef ASSERT 2152 static bool is_vm_complete() { return _vm_complete; } 2153 #endif 2154 2155 // Verification 2156 static void verify(); 2157 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); 2158 static void print(bool print_stacks, bool internal_format) { 2159 // this function is only used by debug.cpp 2160 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); 2161 } 2162 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 2163 static void print_threads_compiling(outputStream* st, char* buf, int buflen); 2164 2165 // Get Java threads that are waiting to enter a monitor. If doLock 2166 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2167 // VM needs to be at a safepoint. 2168 static GrowableArray<JavaThread*>* get_pending_threads(int count, 2169 address monitor, bool doLock); 2170 2171 // Get owning Java thread from the monitor's owner field. If doLock 2172 // is true, then Threads_lock is grabbed as needed. Otherwise, the 2173 // VM needs to be at a safepoint. 2174 static JavaThread *owning_thread_from_monitor_owner(address owner, 2175 bool doLock); 2176 2177 // Number of threads on the active threads list 2178 static int number_of_threads() { return _number_of_threads; } 2179 // Number of non-daemon threads on the active threads list 2180 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 2181 2182 // Deoptimizes all frames tied to marked nmethods 2183 static void deoptimized_wrt_marked_nmethods(); 2184 2185 static JavaThread* find_java_thread_from_java_tid(jlong java_tid); 2186 2187 }; 2188 2189 2190 // Thread iterator 2191 class ThreadClosure: public StackObj { 2192 public: 2193 virtual void do_thread(Thread* thread) = 0; 2194 }; 2195 2196 class SignalHandlerMark: public StackObj { 2197 private: 2198 Thread* _thread; 2199 public: 2200 SignalHandlerMark(Thread* t) { 2201 _thread = t; 2202 if (_thread) _thread->enter_signal_handler(); 2203 } 2204 ~SignalHandlerMark() { 2205 if (_thread) _thread->leave_signal_handler(); 2206 _thread = NULL; 2207 } 2208 }; 2209 2210 2211 #endif // SHARE_VM_RUNTIME_THREAD_HPP