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