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