1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP 26 #define SHARE_VM_RUNTIME_THREAD_HPP 27 28 #include "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/thread_ext.hpp" 44 #include "runtime/unhandledOops.hpp" 45 #include "utilities/exceptions.hpp" 46 #include "utilities/macros.hpp" 47 #include "utilities/top.hpp" 48 #if INCLUDE_ALL_GCS 49 #include "gc_implementation/g1/dirtyCardQueue.hpp" 50 #include "gc_implementation/g1/satbQueue.hpp" 51 #endif // INCLUDE_ALL_GCS 52 #ifdef TARGET_ARCH_zero 53 # include "stack_zero.hpp" 54 #endif 55 #if INCLUDE_JFR 56 #include "jfr/support/jfrThreadExtension.hpp" 57 #endif 58 59 class ThreadSafepointState; 60 class ThreadProfiler; 61 62 class JvmtiThreadState; 63 class JvmtiGetLoadedClassesClosure; 64 class ThreadStatistics; 65 class ConcurrentLocksDump; 66 class ParkEvent; 67 class Parker; 68 69 class ciEnv; 70 class CompileThread; 71 class CompileLog; 72 class CompileTask; 73 class CompileQueue; 74 class CompilerCounters; 75 class vframeArray; 76 77 class DeoptResourceMark; 78 class jvmtiDeferredLocalVariableSet; 79 80 class GCTaskQueue; 81 class ThreadClosure; 82 class IdealGraphPrinter; 83 84 class Metadata; 85 template <class T, MEMFLAGS F> class ChunkedList; 86 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer; 87 88 DEBUG_ONLY(class ResourceMark;) 89 90 class WorkerThread; 91 92 // Class hierarchy 93 // - Thread 94 // - NamedThread 95 // - VMThread 96 // - ConcurrentGCThread 97 // - WorkerThread 98 // - GangWorker 99 // - GCTaskThread 100 // - JavaThread 101 // - WatcherThread 102 103 class Thread: public ThreadShadow { 104 friend class VMStructs; 105 private: 106 // Exception handling 107 // (Note: _pending_exception and friends are in ThreadShadow) 108 //oop _pending_exception; // pending exception for current thread 109 // const char* _exception_file; // file information for exception (debugging only) 110 // int _exception_line; // line information for exception (debugging only) 111 protected: 112 // Support for forcing alignment of thread objects for biased locking 113 void* _real_malloc_address; 114 public: 115 void* operator new(size_t size) throw() { return allocate(size, true); } 116 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 117 return allocate(size, false); } 118 void operator delete(void* p); 119 120 protected: 121 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 122 private: 123 124 // *************************************************************** 125 // Suspend and resume support 126 // *************************************************************** 127 // 128 // VM suspend/resume no longer exists - it was once used for various 129 // things including safepoints but was deprecated and finally removed 130 // in Java 7. Because VM suspension was considered "internal" Java-level 131 // suspension was considered "external", and this legacy naming scheme 132 // remains. 133 // 134 // External suspend/resume requests come from JVM_SuspendThread, 135 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI 136 // ResumeThread. External 137 // suspend requests cause _external_suspend to be set and external 138 // resume requests cause _external_suspend to be cleared. 139 // External suspend requests do not nest on top of other external 140 // suspend requests. The higher level APIs reject suspend requests 141 // for already suspended threads. 142 // 143 // The external_suspend 144 // flag is checked by has_special_runtime_exit_condition() and java thread 145 // will self-suspend when handle_special_runtime_exit_condition() is 146 // called. Most uses of the _thread_blocked state in JavaThreads are 147 // considered the same as being externally suspended; if the blocking 148 // condition lifts, the JavaThread will self-suspend. Other places 149 // where VM checks for external_suspend include: 150 // + mutex granting (do not enter monitors when thread is suspended) 151 // + state transitions from _thread_in_native 152 // 153 // In general, java_suspend() does not wait for an external suspend 154 // request to complete. When it returns, the only guarantee is that 155 // the _external_suspend field is true. 156 // 157 // wait_for_ext_suspend_completion() is used to wait for an external 158 // suspend request to complete. External suspend requests are usually 159 // followed by some other interface call that requires the thread to 160 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into 161 // the interface that requires quiescence, we give the JavaThread a 162 // chance to self-suspend before we need it to be quiescent. This 163 // improves overall suspend/query performance. 164 // 165 // _suspend_flags controls the behavior of java_ suspend/resume. 166 // It must be set under the protection of SR_lock. Read from the flag is 167 // OK without SR_lock as long as the value is only used as a hint. 168 // (e.g., check _external_suspend first without lock and then recheck 169 // inside SR_lock and finish the suspension) 170 // 171 // _suspend_flags is also overloaded for other "special conditions" so 172 // that a single check indicates whether any special action is needed 173 // eg. for async exceptions. 174 // ------------------------------------------------------------------- 175 // Notes: 176 // 1. The suspend/resume logic no longer uses ThreadState in OSThread 177 // but we still update its value to keep other part of the system (mainly 178 // JVMTI) happy. ThreadState is legacy code (see notes in 179 // osThread.hpp). 180 // 181 // 2. It would be more natural if set_external_suspend() is private and 182 // part of java_suspend(), but that probably would affect the suspend/query 183 // performance. Need more investigation on this. 184 // 185 186 // suspend/resume lock: used for self-suspend 187 Monitor* _SR_lock; 188 189 protected: 190 enum SuspendFlags { 191 // NOTE: avoid using the sign-bit as cc generates different test code 192 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 193 194 _external_suspend = 0x20000000U, // thread is asked to self suspend 195 _ext_suspended = 0x40000000U, // thread has self-suspended 196 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt 197 198 _has_async_exception = 0x00000001U, // there is a pending async exception 199 _critical_native_unlock = 0x00000002U, // Must call back to unlock JNI critical lock 200 201 JFR_ONLY(_trace_flag = 0x00000004U) // call jfr tracing 202 }; 203 204 // various suspension related flags - atomically updated 205 // overloaded for async exception checking in check_special_condition_for_native_trans. 206 volatile uint32_t _suspend_flags; 207 208 private: 209 int _num_nested_signal; 210 211 public: 212 void enter_signal_handler() { _num_nested_signal++; } 213 void leave_signal_handler() { _num_nested_signal--; } 214 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } 215 216 private: 217 // Debug tracing 218 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; 219 220 // Active_handles points to a block of handles 221 JNIHandleBlock* _active_handles; 222 223 // One-element thread local free list 224 JNIHandleBlock* _free_handle_block; 225 226 // Point to the last handle mark 227 HandleMark* _last_handle_mark; 228 229 // The parity of the last strong_roots iteration in which this thread was 230 // claimed as a task. 231 jint _oops_do_parity; 232 233 public: 234 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 235 HandleMark* last_handle_mark() const { return _last_handle_mark; } 236 private: 237 238 // debug support for checking if code does allow safepoints or not 239 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on 240 // mutex, or blocking on an object synchronizer (Java locking). 241 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases 242 // If !allow_allocation(), then an assertion failure will happen during allocation 243 // (Hence, !allow_safepoint() => !allow_allocation()). 244 // 245 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. 246 // 247 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen 248 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. 249 250 // Used by SkipGCALot class. 251 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 252 253 friend class No_Alloc_Verifier; 254 friend class No_Safepoint_Verifier; 255 friend class Pause_No_Safepoint_Verifier; 256 friend class ThreadLocalStorage; 257 friend class GC_locker; 258 259 ThreadLocalAllocBuffer _tlab; // Thread-local eden 260 jlong _allocated_bytes; // Cumulative number of bytes allocated on 261 // the Java heap 262 263 // Thread-local buffer used by MetadataOnStackMark. 264 MetadataOnStackBuffer* _metadata_on_stack_buffer; 265 266 JFR_ONLY(DEFINE_THREAD_LOCAL_FIELD_JFR;) // Thread-local data for jfr 267 268 ThreadExt _ext; 269 270 int _vm_operation_started_count; // VM_Operation support 271 int _vm_operation_completed_count; // VM_Operation support 272 273 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread 274 // is waiting to lock 275 bool _current_pending_monitor_is_from_java; // locking is from Java code 276 277 // ObjectMonitor on which this thread called Object.wait() 278 ObjectMonitor* _current_waiting_monitor; 279 280 // Private thread-local objectmonitor list - a simple cache organized as a SLL. 281 public: 282 ObjectMonitor* omFreeList; 283 int omFreeCount; // length of omFreeList 284 int omFreeProvision; // reload chunk size 285 ObjectMonitor* omInUseList; // SLL to track monitors in circulation 286 int omInUseCount; // length of omInUseList 287 288 #ifdef ASSERT 289 private: 290 bool _visited_for_critical_count; 291 292 public: 293 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } 294 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } 295 #endif 296 297 public: 298 enum { 299 is_definitely_current_thread = true 300 }; 301 302 // Constructor 303 Thread(); 304 virtual ~Thread(); 305 306 // initializtion 307 void initialize_thread_local_storage(); 308 309 // thread entry point 310 virtual void run(); 311 312 // Testers 313 virtual bool is_VM_thread() const { return false; } 314 virtual bool is_Java_thread() const { return false; } 315 virtual bool is_Compiler_thread() const { return false; } 316 virtual bool is_hidden_from_external_view() const { return false; } 317 virtual bool is_jvmti_agent_thread() const { return false; } 318 // True iff the thread can perform GC operations at a safepoint. 319 // Generally will be true only of VM thread and parallel GC WorkGang 320 // threads. 321 virtual bool is_GC_task_thread() const { return false; } 322 virtual bool is_Watcher_thread() const { return false; } 323 virtual bool is_ConcurrentGC_thread() const { return false; } 324 virtual bool is_Named_thread() const { return false; } 325 virtual bool is_Worker_thread() const { return false; } 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 #endif // CHECK_UNHANDLED_OOPS 404 405 #ifndef PRODUCT 406 bool skip_gcalot() { return _skip_gcalot; } 407 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 408 #endif 409 410 public: 411 // Installs a pending exception to be inserted later 412 static void send_async_exception(oop thread_oop, oop java_throwable); 413 414 // Resource area 415 ResourceArea* resource_area() const { return _resource_area; } 416 void set_resource_area(ResourceArea* area) { _resource_area = area; } 417 418 OSThread* osthread() const { return _osthread; } 419 void set_osthread(OSThread* thread) { _osthread = thread; } 420 421 // JNI handle support 422 JNIHandleBlock* active_handles() const { return _active_handles; } 423 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 424 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 425 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 426 427 // Internal handle support 428 HandleArea* handle_area() const { return _handle_area; } 429 void set_handle_area(HandleArea* area) { _handle_area = area; } 430 431 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 432 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 433 434 // Thread-Local Allocation Buffer (TLAB) support 435 ThreadLocalAllocBuffer& tlab() { return _tlab; } 436 void initialize_tlab() { 437 if (UseTLAB) { 438 tlab().initialize(); 439 } 440 } 441 442 jlong allocated_bytes() { return _allocated_bytes; } 443 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 444 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 445 inline jlong cooked_allocated_bytes(); 446 447 JFR_ONLY(DEFINE_THREAD_LOCAL_ACCESSOR_JFR;) 448 JFR_ONLY(DEFINE_TRACE_SUSPEND_FLAG_METHODS) 449 450 const ThreadExt& ext() const { return _ext; } 451 ThreadExt& ext() { return _ext; } 452 453 // VM operation support 454 int vm_operation_ticket() { return ++_vm_operation_started_count; } 455 int vm_operation_completed_count() { return _vm_operation_completed_count; } 456 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } 457 458 // For tracking the heavyweight monitor the thread is pending on. 459 ObjectMonitor* current_pending_monitor() { 460 return _current_pending_monitor; 461 } 462 void set_current_pending_monitor(ObjectMonitor* monitor) { 463 _current_pending_monitor = monitor; 464 } 465 void set_current_pending_monitor_is_from_java(bool from_java) { 466 _current_pending_monitor_is_from_java = from_java; 467 } 468 bool current_pending_monitor_is_from_java() { 469 return _current_pending_monitor_is_from_java; 470 } 471 472 // For tracking the ObjectMonitor on which this thread called Object.wait() 473 ObjectMonitor* current_waiting_monitor() { 474 return _current_waiting_monitor; 475 } 476 void set_current_waiting_monitor(ObjectMonitor* monitor) { 477 _current_waiting_monitor = monitor; 478 } 479 480 // GC support 481 // Apply "f->do_oop" to all root oops in "this". 482 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive. 483 // Used by JavaThread::oops_do. 484 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 485 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 486 487 // Handles the parallel case for the method below. 488 private: 489 bool claim_oops_do_par_case(int collection_parity); 490 public: 491 // Requires that "collection_parity" is that of the current roots 492 // iteration. If "is_par" is false, sets the parity of "this" to 493 // "collection_parity", and returns "true". If "is_par" is true, 494 // uses an atomic instruction to set the current threads parity to 495 // "collection_parity", if it is not already. Returns "true" iff the 496 // calling thread does the update, this indicates that the calling thread 497 // has claimed the thread's stack as a root groop in the current 498 // collection. 499 bool claim_oops_do(bool is_par, int collection_parity) { 500 if (!is_par) { 501 _oops_do_parity = collection_parity; 502 return true; 503 } else { 504 return claim_oops_do_par_case(collection_parity); 505 } 506 } 507 508 // Sweeper support 509 void nmethods_do(CodeBlobClosure* cf); 510 511 // jvmtiRedefineClasses support 512 void metadata_do(void f(Metadata*)); 513 514 // Used by fast lock support 515 virtual bool is_lock_owned(address adr) const; 516 517 // Check if address is in the stack of the thread (not just for locks). 518 // Warning: the method can only be used on the running thread 519 bool is_in_stack(address adr) const; 520 // Check if address is in the usable part of the stack (excludes protected 521 // guard pages) 522 bool is_in_usable_stack(address adr) const; 523 524 // Sets this thread as starting thread. Returns failure if thread 525 // creation fails due to lack of memory, too many threads etc. 526 bool set_as_starting_thread(); 527 528 void set_metadata_on_stack_buffer(MetadataOnStackBuffer* buffer) { _metadata_on_stack_buffer = buffer; } 529 MetadataOnStackBuffer* metadata_on_stack_buffer() const { return _metadata_on_stack_buffer; } 530 531 protected: 532 // OS data associated with the thread 533 OSThread* _osthread; // Platform-specific thread information 534 535 // Thread local resource area for temporary allocation within the VM 536 ResourceArea* _resource_area; 537 538 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 539 540 // Thread local handle area for allocation of handles within the VM 541 HandleArea* _handle_area; 542 GrowableArray<Metadata*>* _metadata_handles; 543 544 // Support for stack overflow handling, get_thread, etc. 545 address _stack_base; 546 size_t _stack_size; 547 uintptr_t _self_raw_id; // used by get_thread (mutable) 548 int _lgrp_id; 549 550 public: 551 // Stack overflow support 552 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 553 554 void set_stack_base(address base) { _stack_base = base; } 555 size_t stack_size() const { return _stack_size; } 556 void set_stack_size(size_t size) { _stack_size = size; } 557 void record_stack_base_and_size(); 558 559 bool on_local_stack(address adr) const { 560 /* QQQ this has knowledge of direction, ought to be a stack method */ 561 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); 562 } 563 564 uintptr_t self_raw_id() { return _self_raw_id; } 565 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } 566 567 int lgrp_id() const { return _lgrp_id; } 568 void set_lgrp_id(int value) { _lgrp_id = value; } 569 570 // Printing 571 void print_on(outputStream* st) const; 572 void print() const { print_on(tty); } 573 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 574 575 // Debug-only code 576 #ifdef ASSERT 577 private: 578 // Deadlock detection support for Mutex locks. List of locks own by thread. 579 Monitor* _owned_locks; 580 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 581 // thus the friendship 582 friend class Mutex; 583 friend class Monitor; 584 585 public: 586 void print_owned_locks_on(outputStream* st) const; 587 void print_owned_locks() const { print_owned_locks_on(tty); } 588 Monitor* owned_locks() const { return _owned_locks; } 589 bool owns_locks() const { return owned_locks() != NULL; } 590 bool owns_locks_but_compiled_lock() const; 591 592 // Deadlock detection 593 bool allow_allocation() { return _allow_allocation_count == 0; } 594 ResourceMark* current_resource_mark() { return _current_resource_mark; } 595 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 596 #endif 597 598 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; 599 600 private: 601 volatile int _jvmti_env_iteration_count; 602 603 public: 604 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 605 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 606 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 607 608 // Code generation 609 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } 610 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } 611 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } 612 613 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } 614 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } 615 616 #define TLAB_FIELD_OFFSET(name) \ 617 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } 618 619 TLAB_FIELD_OFFSET(start) 620 TLAB_FIELD_OFFSET(end) 621 TLAB_FIELD_OFFSET(top) 622 TLAB_FIELD_OFFSET(pf_top) 623 TLAB_FIELD_OFFSET(size) // desired_size 624 TLAB_FIELD_OFFSET(refill_waste_limit) 625 TLAB_FIELD_OFFSET(number_of_refills) 626 TLAB_FIELD_OFFSET(fast_refill_waste) 627 TLAB_FIELD_OFFSET(slow_allocations) 628 629 #undef TLAB_FIELD_OFFSET 630 631 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); } 632 633 JFR_ONLY(DEFINE_THREAD_LOCAL_OFFSET_JFR;) 634 635 public: 636 volatile intptr_t _Stalled ; 637 volatile int _TypeTag ; 638 ParkEvent * _ParkEvent ; // for synchronized() 639 ParkEvent * _SleepEvent ; // for Thread.sleep 640 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor 641 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease 642 int NativeSyncRecursion ; // diagnostic 643 644 volatile int _OnTrap ; // Resume-at IP delta 645 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG 646 jint _hashStateX ; // thread-specific hashCode generator state 647 jint _hashStateY ; 648 jint _hashStateZ ; 649 void * _schedctl ; 650 651 652 volatile jint rng [4] ; // RNG for spin loop 653 654 // Low-level leaf-lock primitives used to implement synchronization 655 // and native monitor-mutex infrastructure. 656 // Not for general synchronization use. 657 static void SpinAcquire (volatile int * Lock, const char * Name) ; 658 static void SpinRelease (volatile int * Lock) ; 659 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; 660 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; 661 static void muxRelease (volatile intptr_t * Lock) ; 662 }; 663 664 // Inline implementation of Thread::current() 665 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of 666 // startup. 667 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same 668 // period. This is inlined in thread_<os_family>.inline.hpp. 669 670 inline Thread* Thread::current() { 671 #ifdef ASSERT 672 // This function is very high traffic. Define PARANOID to enable expensive 673 // asserts. 674 #ifdef PARANOID 675 // Signal handler should call ThreadLocalStorage::get_thread_slow() 676 Thread* t = ThreadLocalStorage::get_thread_slow(); 677 assert(t != NULL && !t->is_inside_signal_handler(), 678 "Don't use Thread::current() inside signal handler"); 679 #endif 680 #endif 681 Thread* thread = ThreadLocalStorage::thread(); 682 assert(thread != NULL, "just checking"); 683 return thread; 684 } 685 686 // Name support for threads. non-JavaThread subclasses with multiple 687 // uniquely named instances should derive from this. 688 class NamedThread: public Thread { 689 friend class VMStructs; 690 enum { 691 max_name_len = 64 692 }; 693 private: 694 char* _name; 695 // log JavaThread being processed by oops_do 696 JavaThread* _processed_thread; 697 698 public: 699 NamedThread(); 700 ~NamedThread(); 701 // May only be called once per thread. 702 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); 703 virtual bool is_Named_thread() const { return true; } 704 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } 705 JavaThread *processed_thread() { return _processed_thread; } 706 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } 707 }; 708 709 // Worker threads are named and have an id of an assigned work. 710 class WorkerThread: public NamedThread { 711 private: 712 uint _id; 713 public: 714 WorkerThread() : _id(0) { } 715 virtual bool is_Worker_thread() const { return true; } 716 717 virtual WorkerThread* as_Worker_thread() const { 718 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); 719 return (WorkerThread*) this; 720 } 721 722 void set_id(uint work_id) { _id = work_id; } 723 uint id() const { return _id; } 724 }; 725 726 // A single WatcherThread is used for simulating timer interrupts. 727 class WatcherThread: public Thread { 728 friend class VMStructs; 729 public: 730 virtual void run(); 731 732 private: 733 static WatcherThread* _watcher_thread; 734 735 static bool _startable; 736 volatile static bool _should_terminate; // updated without holding lock 737 738 os::WatcherThreadCrashProtection* _crash_protection; 739 public: 740 enum SomeConstants { 741 delay_interval = 10 // interrupt delay in milliseconds 742 }; 743 744 // Constructor 745 WatcherThread(); 746 747 // Tester 748 bool is_Watcher_thread() const { return true; } 749 750 // Printing 751 char* name() const { return (char*)"VM Periodic Task Thread"; } 752 void print_on(outputStream* st) const; 753 void print() const { print_on(tty); } 754 void unpark(); 755 756 // Returns the single instance of WatcherThread 757 static WatcherThread* watcher_thread() { return _watcher_thread; } 758 759 // Create and start the single instance of WatcherThread, or stop it on shutdown 760 static void start(); 761 static void stop(); 762 // Only allow start once the VM is sufficiently initialized 763 // Otherwise the first task to enroll will trigger the start 764 static void make_startable(); 765 766 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) { 767 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread"); 768 _crash_protection = crash_protection; 769 } 770 771 bool has_crash_protection() const { return _crash_protection != NULL; } 772 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; } 773 774 private: 775 int sleep() const; 776 }; 777 778 779 class CompilerThread; 780 781 typedef void (*ThreadFunction)(JavaThread*, TRAPS); 782 783 class JavaThread: public Thread { 784 friend class VMStructs; 785 private: 786 JavaThread* _next; // The next thread in the Threads list 787 oop _threadObj; // The Java level thread object 788 789 #ifdef ASSERT 790 private: 791 int _java_call_counter; 792 793 public: 794 int java_call_counter() { return _java_call_counter; } 795 void inc_java_call_counter() { _java_call_counter++; } 796 void dec_java_call_counter() { 797 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 798 _java_call_counter--; 799 } 800 private: // restore original namespace restriction 801 #endif // ifdef ASSERT 802 803 #ifndef PRODUCT 804 public: 805 enum { 806 jump_ring_buffer_size = 16 807 }; 808 private: // restore original namespace restriction 809 #endif 810 811 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 812 813 ThreadFunction _entry_point; 814 815 JNIEnv _jni_environment; 816 817 // Deopt support 818 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 819 820 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we 821 // transition out of native 822 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized 823 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 824 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 825 // Because deoptimization is lazy we must save jvmti requests to set locals 826 // in compiled frames until we deoptimize and we have an interpreter frame. 827 // This holds the pointer to array (yeah like there might be more than one) of 828 // description of compiled vframes that have locals that need to be updated. 829 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; 830 831 // Handshake value for fixing 6243940. We need a place for the i2c 832 // adapter to store the callee Method*. This value is NEVER live 833 // across a gc point so it does NOT have to be gc'd 834 // The handshake is open ended since we can't be certain that it will 835 // be NULLed. This is because we rarely ever see the race and end up 836 // in handle_wrong_method which is the backend of the handshake. See 837 // code in i2c adapters and handle_wrong_method. 838 839 Method* _callee_target; 840 841 // Used to pass back results to the interpreter or generated code running Java code. 842 oop _vm_result; // oop result is GC-preserved 843 Metadata* _vm_result_2; // non-oop result 844 845 // See ReduceInitialCardMarks: this holds the precise space interval of 846 // the most recent slow path allocation for which compiled code has 847 // elided card-marks for performance along the fast-path. 848 MemRegion _deferred_card_mark; 849 850 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 851 // allocated during deoptimization 852 // and by JNI_MonitorEnter/Exit 853 854 // Async. requests support 855 enum AsyncRequests { 856 _no_async_condition = 0, 857 _async_exception, 858 _async_unsafe_access_error 859 }; 860 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request 861 oop _pending_async_exception; 862 863 // Safepoint support 864 public: // Expose _thread_state for SafeFetchInt() 865 volatile JavaThreadState _thread_state; 866 private: 867 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint 868 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 869 870 // JavaThread termination support 871 enum TerminatedTypes { 872 _not_terminated = 0xDEAD - 2, 873 _thread_exiting, // JavaThread::exit() has been called for this thread 874 _thread_terminated, // JavaThread is removed from thread list 875 _vm_exited // JavaThread is still executing native code, but VM is terminated 876 // only VM_Exit can set _vm_exited 877 }; 878 879 // In general a JavaThread's _terminated field transitions as follows: 880 // 881 // _not_terminated => _thread_exiting => _thread_terminated 882 // 883 // _vm_exited is a special value to cover the case of a JavaThread 884 // executing native code after the VM itself is terminated. 885 volatile TerminatedTypes _terminated; 886 // suspend/resume support 887 volatile bool _suspend_equivalent; // Suspend equivalent condition 888 jint _in_deopt_handler; // count of deoptimization 889 // handlers thread is in 890 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 891 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 892 // never locked) when throwing an exception. Used by interpreter only. 893 894 // JNI attach states: 895 enum JNIAttachStates { 896 _not_attaching_via_jni = 1, // thread is not attaching via JNI 897 _attaching_via_jni, // thread is attaching via JNI 898 _attached_via_jni // thread has attached via JNI 899 }; 900 901 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 902 // A native thread that is attaching via JNI starts with a value 903 // of _attaching_via_jni and transitions to _attached_via_jni. 904 volatile JNIAttachStates _jni_attach_state; 905 906 public: 907 // State of the stack guard pages for this thread. 908 enum StackGuardState { 909 stack_guard_unused, // not needed 910 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow 911 stack_guard_enabled // enabled 912 }; 913 914 private: 915 916 StackGuardState _stack_guard_state; 917 918 // Precompute the limit of the stack as used in stack overflow checks. 919 // We load it from here to simplify the stack overflow check in assembly. 920 address _stack_overflow_limit; 921 922 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 923 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 924 // code) 925 volatile oop _exception_oop; // Exception thrown in compiled code 926 volatile address _exception_pc; // PC where exception happened 927 volatile address _exception_handler_pc; // PC for handler of exception 928 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 929 930 // support for JNI critical regions 931 jint _jni_active_critical; // count of entries into JNI critical region 932 933 // Checked JNI: function name requires exception check 934 char* _pending_jni_exception_check_fn; 935 936 // For deadlock detection. 937 int _depth_first_number; 938 939 // JVMTI PopFrame support 940 // This is set to popframe_pending to signal that top Java frame should be popped immediately 941 int _popframe_condition; 942 943 // If reallocation of scalar replaced objects fails, we throw OOM 944 // and during exception propagation, pop the top 945 // _frames_to_pop_failed_realloc frames, the ones that reference 946 // failed reallocations. 947 int _frames_to_pop_failed_realloc; 948 949 #ifndef PRODUCT 950 int _jmp_ring_index; 951 struct { 952 // We use intptr_t instead of address so debugger doesn't try and display strings 953 intptr_t _target; 954 intptr_t _instruction; 955 const char* _file; 956 int _line; 957 } _jmp_ring[ jump_ring_buffer_size ]; 958 #endif /* PRODUCT */ 959 960 #if INCLUDE_ALL_GCS 961 // Support for G1 barriers 962 963 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. 964 // Set of all such queues. 965 static SATBMarkQueueSet _satb_mark_queue_set; 966 967 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. 968 // Set of all such queues. 969 static DirtyCardQueueSet _dirty_card_queue_set; 970 971 void flush_barrier_queues(); 972 #endif // INCLUDE_ALL_GCS 973 974 friend class VMThread; 975 friend class ThreadWaitTransition; 976 friend class VM_Exit; 977 978 void initialize(); // Initialized the instance variables 979 980 public: 981 // Constructor 982 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads 983 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 984 ~JavaThread(); 985 986 #ifdef ASSERT 987 // verify this JavaThread hasn't be published in the Threads::list yet 988 void verify_not_published(); 989 #endif 990 991 //JNI functiontable getter/setter for JVMTI jni function table interception API. 992 void set_jni_functions(struct JNINativeInterface_* functionTable) { 993 _jni_environment.functions = functionTable; 994 } 995 struct JNINativeInterface_* get_jni_functions() { 996 return (struct JNINativeInterface_ *)_jni_environment.functions; 997 } 998 999 // This function is called at thread creation to allow 1000 // platform specific thread variables to be initialized. 1001 void cache_global_variables(); 1002 1003 // Executes Shutdown.shutdown() 1004 void invoke_shutdown_hooks(); 1005 1006 // Cleanup on thread exit 1007 enum ExitType { 1008 normal_exit, 1009 jni_detach 1010 }; 1011 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 1012 1013 void cleanup_failed_attach_current_thread(); 1014 1015 // Testers 1016 virtual bool is_Java_thread() const { return true; } 1017 1018 // Thread chain operations 1019 JavaThread* next() const { return _next; } 1020 void set_next(JavaThread* p) { _next = p; } 1021 1022 // Thread oop. threadObj() can be NULL for initial JavaThread 1023 // (or for threads attached via JNI) 1024 oop threadObj() const { return _threadObj; } 1025 void set_threadObj(oop p) { _threadObj = p; } 1026 1027 ThreadPriority java_priority() const; // Read from threadObj() 1028 1029 // Prepare thread and add to priority queue. If a priority is 1030 // not specified, use the priority of the thread object. Threads_lock 1031 // must be held while this function is called. 1032 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 1033 void prepare_ext(); 1034 1035 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 1036 address saved_exception_pc() { return _saved_exception_pc; } 1037 1038 1039 ThreadFunction entry_point() const { return _entry_point; } 1040 1041 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1042 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); 1043 1044 // Last frame anchor routines 1045 1046 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1047 1048 // last_Java_sp 1049 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1050 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1051 1052 // last_Java_pc 1053 1054 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1055 1056 // Safepoint support 1057 #ifndef PPC64 1058 JavaThreadState thread_state() const { return _thread_state; } 1059 void set_thread_state(JavaThreadState s) { _thread_state = s; } 1060 #else 1061 // Use membars when accessing volatile _thread_state. See 1062 // Threads::create_vm() for size checks. 1063 inline JavaThreadState thread_state() const; 1064 inline void set_thread_state(JavaThreadState s); 1065 #endif 1066 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } 1067 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } 1068 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } 1069 1070 // thread has called JavaThread::exit() or is terminated 1071 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } 1072 // thread is terminated (no longer on the threads list); we compare 1073 // against the two non-terminated values so that a freed JavaThread 1074 // will also be considered terminated. 1075 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } 1076 void set_terminated(TerminatedTypes t) { _terminated = t; } 1077 // special for Threads::remove() which is static: 1078 void set_terminated_value() { _terminated = _thread_terminated; } 1079 void block_if_vm_exited(); 1080 1081 bool doing_unsafe_access() { return _doing_unsafe_access; } 1082 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1083 1084 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1085 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1086 1087 // Suspend/resume support for JavaThread 1088 private: 1089 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } 1090 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } 1091 1092 public: 1093 void java_suspend(); 1094 void java_resume(); 1095 int java_suspend_self(); 1096 1097 void check_and_wait_while_suspended() { 1098 assert(JavaThread::current() == this, "sanity check"); 1099 1100 bool do_self_suspend; 1101 do { 1102 // were we externally suspended while we were waiting? 1103 do_self_suspend = handle_special_suspend_equivalent_condition(); 1104 if (do_self_suspend) { 1105 // don't surprise the thread that suspended us by returning 1106 java_suspend_self(); 1107 set_suspend_equivalent(); 1108 } 1109 } while (do_self_suspend); 1110 } 1111 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); 1112 // Check for async exception in addition to safepoint and suspend request. 1113 static void check_special_condition_for_native_trans(JavaThread *thread); 1114 1115 // Same as check_special_condition_for_native_trans but finishes the 1116 // transition into thread_in_Java mode so that it can potentially 1117 // block. 1118 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); 1119 1120 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); 1121 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { 1122 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1123 // Warning: is_ext_suspend_completed() may temporarily drop the 1124 // SR_lock to allow the thread to reach a stable thread state if 1125 // it is currently in a transient thread state. 1126 return is_ext_suspend_completed(false /*!called_by_wait */, 1127 SuspendRetryDelay, bits); 1128 } 1129 1130 // We cannot allow wait_for_ext_suspend_completion() to run forever or 1131 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally 1132 // passed as the count and delay parameters. Experiments with specific 1133 // calls to wait_for_ext_suspend_completion() can be done by passing 1134 // other values in the code. Experiments with all calls can be done 1135 // via the appropriate -XX options. 1136 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); 1137 1138 void set_external_suspend() { set_suspend_flag (_external_suspend); } 1139 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } 1140 1141 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } 1142 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } 1143 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } 1144 1145 bool is_external_suspend() const { 1146 return (_suspend_flags & _external_suspend) != 0; 1147 } 1148 // Whenever a thread transitions from native to vm/java it must suspend 1149 // if external|deopt suspend is present. 1150 bool is_suspend_after_native() const { 1151 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; 1152 } 1153 1154 // external suspend request is completed 1155 bool is_ext_suspended() const { 1156 return (_suspend_flags & _ext_suspended) != 0; 1157 } 1158 1159 bool is_external_suspend_with_lock() const { 1160 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1161 return is_external_suspend(); 1162 } 1163 1164 // Special method to handle a pending external suspend request 1165 // when a suspend equivalent condition lifts. 1166 bool handle_special_suspend_equivalent_condition() { 1167 assert(is_suspend_equivalent(), 1168 "should only be called in a suspend equivalence condition"); 1169 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1170 bool ret = is_external_suspend(); 1171 if (!ret) { 1172 // not about to self-suspend so clear suspend equivalence 1173 clear_suspend_equivalent(); 1174 } 1175 // implied else: 1176 // We have a pending external suspend request so we leave the 1177 // suspend_equivalent flag set until java_suspend_self() sets 1178 // the ext_suspended flag and clears the suspend_equivalent 1179 // flag. This insures that wait_for_ext_suspend_completion() 1180 // will return consistent values. 1181 return ret; 1182 } 1183 1184 // utility methods to see if we are doing some kind of suspension 1185 bool is_being_ext_suspended() const { 1186 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1187 return is_ext_suspended() || is_external_suspend(); 1188 } 1189 1190 bool is_suspend_equivalent() const { return _suspend_equivalent; } 1191 1192 void set_suspend_equivalent() { _suspend_equivalent = true; }; 1193 void clear_suspend_equivalent() { _suspend_equivalent = false; }; 1194 1195 // Thread.stop support 1196 void send_thread_stop(oop throwable); 1197 AsyncRequests clear_special_runtime_exit_condition() { 1198 AsyncRequests x = _special_runtime_exit_condition; 1199 _special_runtime_exit_condition = _no_async_condition; 1200 return x; 1201 } 1202 1203 // Are any async conditions present? 1204 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } 1205 1206 void check_and_handle_async_exceptions(bool check_unsafe_error = true); 1207 1208 // these next two are also used for self-suspension and async exception support 1209 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1210 1211 // Return true if JavaThread has an asynchronous condition or 1212 // if external suspension is requested. 1213 bool has_special_runtime_exit_condition() { 1214 // We call is_external_suspend() last since external suspend should 1215 // be less common. Because we don't use is_external_suspend_with_lock 1216 // it is possible that we won't see an asynchronous external suspend 1217 // request that has just gotten started, i.e., SR_lock grabbed but 1218 // _external_suspend field change either not made yet or not visible 1219 // yet. However, this is okay because the request is asynchronous and 1220 // we will see the new flag value the next time through. It's also 1221 // possible that the external suspend request is dropped after 1222 // we have checked is_external_suspend(), we will recheck its value 1223 // under SR_lock in java_suspend_self(). 1224 return (_special_runtime_exit_condition != _no_async_condition) || 1225 is_external_suspend() || is_deopt_suspend(); 1226 } 1227 1228 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } 1229 1230 void set_pending_async_exception(oop e) { 1231 _pending_async_exception = e; 1232 _special_runtime_exit_condition = _async_exception; 1233 set_has_async_exception(); 1234 } 1235 1236 // Fast-locking support 1237 bool is_lock_owned(address adr) const; 1238 1239 // Accessors for vframe array top 1240 // The linked list of vframe arrays are sorted on sp. This means when we 1241 // unpack the head must contain the vframe array to unpack. 1242 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1243 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1244 1245 // Side structure for defering update of java frame locals until deopt occurs 1246 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } 1247 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } 1248 1249 // These only really exist to make debugging deopt problems simpler 1250 1251 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1252 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1253 1254 // The special resourceMark used during deoptimization 1255 1256 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1257 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1258 1259 intptr_t* must_deopt_id() { return _must_deopt_id; } 1260 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } 1261 void clear_must_deopt_id() { _must_deopt_id = NULL; } 1262 1263 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } 1264 nmethod* deopt_nmethod() { return _deopt_nmethod; } 1265 1266 Method* callee_target() const { return _callee_target; } 1267 void set_callee_target (Method* x) { _callee_target = x; } 1268 1269 // Oop results of vm runtime calls 1270 oop vm_result() const { return _vm_result; } 1271 void set_vm_result (oop x) { _vm_result = x; } 1272 1273 Metadata* vm_result_2() const { return _vm_result_2; } 1274 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1275 1276 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1277 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1278 1279 // Exception handling for compiled methods 1280 oop exception_oop() const { return _exception_oop; } 1281 address exception_pc() const { return _exception_pc; } 1282 address exception_handler_pc() const { return _exception_handler_pc; } 1283 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1284 1285 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); } 1286 void set_exception_pc(address a) { _exception_pc = a; } 1287 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1288 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1289 1290 void clear_exception_oop_and_pc() { 1291 set_exception_oop(NULL); 1292 set_exception_pc(NULL); 1293 } 1294 1295 // Stack overflow support 1296 inline size_t stack_available(address cur_sp); 1297 address stack_yellow_zone_base() 1298 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } 1299 size_t stack_yellow_zone_size() 1300 { return StackYellowPages * os::vm_page_size(); } 1301 address stack_red_zone_base() 1302 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } 1303 size_t stack_red_zone_size() 1304 { return StackRedPages * os::vm_page_size(); } 1305 bool in_stack_yellow_zone(address a) 1306 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } 1307 bool in_stack_red_zone(address a) 1308 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } 1309 1310 void create_stack_guard_pages(); 1311 void remove_stack_guard_pages(); 1312 1313 void enable_stack_yellow_zone(); 1314 void disable_stack_yellow_zone(); 1315 void enable_stack_red_zone(); 1316 void disable_stack_red_zone(); 1317 1318 inline bool stack_guard_zone_unused(); 1319 inline bool stack_yellow_zone_disabled(); 1320 inline bool stack_yellow_zone_enabled(); 1321 1322 // Attempt to reguard the stack after a stack overflow may have occurred. 1323 // Returns true if (a) guard pages are not needed on this thread, (b) the 1324 // pages are already guarded, or (c) the pages were successfully reguarded. 1325 // Returns false if there is not enough stack space to reguard the pages, in 1326 // which case the caller should unwind a frame and try again. The argument 1327 // should be the caller's (approximate) sp. 1328 bool reguard_stack(address cur_sp); 1329 // Similar to above but see if current stackpoint is out of the guard area 1330 // and reguard if possible. 1331 bool reguard_stack(void); 1332 1333 address stack_overflow_limit() { return _stack_overflow_limit; } 1334 void set_stack_overflow_limit() { 1335 _stack_overflow_limit = _stack_base - _stack_size + 1336 ((StackShadowPages + 1337 StackYellowPages + 1338 StackRedPages) * os::vm_page_size()); 1339 } 1340 1341 // Misc. accessors/mutators 1342 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1343 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1344 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1345 1346 #ifndef PRODUCT 1347 void record_jump(address target, address instr, const char* file, int line); 1348 #endif /* PRODUCT */ 1349 1350 // For assembly stub generation 1351 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } 1352 #ifndef PRODUCT 1353 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } 1354 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } 1355 #endif /* PRODUCT */ 1356 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } 1357 static ByteSize last_Java_sp_offset() { 1358 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1359 } 1360 static ByteSize last_Java_pc_offset() { 1361 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1362 } 1363 static ByteSize frame_anchor_offset() { 1364 return byte_offset_of(JavaThread, _anchor); 1365 } 1366 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } 1367 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } 1368 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } 1369 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } 1370 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } 1371 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } 1372 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } 1373 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } 1374 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1375 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } 1376 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1377 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } 1378 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } 1379 1380 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1381 static ByteSize should_post_on_exceptions_flag_offset() { 1382 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1383 } 1384 1385 #if INCLUDE_ALL_GCS 1386 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } 1387 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } 1388 #endif // INCLUDE_ALL_GCS 1389 1390 // Returns the jni environment for this thread 1391 JNIEnv* jni_environment() { return &_jni_environment; } 1392 1393 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1394 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1395 // Only return NULL if thread is off the thread list; starting to 1396 // exit should not return NULL. 1397 if (thread_from_jni_env->is_terminated()) { 1398 thread_from_jni_env->block_if_vm_exited(); 1399 return NULL; 1400 } else { 1401 return thread_from_jni_env; 1402 } 1403 } 1404 1405 // JNI critical regions. These can nest. 1406 bool in_critical() { return _jni_active_critical > 0; } 1407 bool in_last_critical() { return _jni_active_critical == 1; } 1408 void enter_critical() { assert(Thread::current() == this || 1409 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(), 1410 "this must be current thread or synchronizing"); 1411 _jni_active_critical++; } 1412 void exit_critical() { assert(Thread::current() == this, 1413 "this must be current thread"); 1414 _jni_active_critical--; 1415 assert(_jni_active_critical >= 0, 1416 "JNI critical nesting problem?"); } 1417 1418 // Checked JNI, is the programmer required to check for exceptions, specify which function name 1419 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1420 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1421 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1422 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1423 1424 // For deadlock detection 1425 int depth_first_number() { return _depth_first_number; } 1426 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1427 1428 private: 1429 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1430 1431 public: 1432 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1433 void add_monitor_chunk(MonitorChunk* chunk); 1434 void remove_monitor_chunk(MonitorChunk* chunk); 1435 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1436 void inc_in_deopt_handler() { _in_deopt_handler++; } 1437 void dec_in_deopt_handler() { 1438 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1439 if (_in_deopt_handler > 0) { // robustness 1440 _in_deopt_handler--; 1441 } 1442 } 1443 1444 private: 1445 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1446 1447 public: 1448 1449 // Frame iteration; calls the function f for all frames on the stack 1450 void frames_do(void f(frame*, const RegisterMap*)); 1451 1452 // Memory operations 1453 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1454 1455 // Sweeper operations 1456 void nmethods_do(CodeBlobClosure* cf); 1457 1458 // RedefineClasses Support 1459 void metadata_do(void f(Metadata*)); 1460 1461 // Memory management operations 1462 void gc_epilogue(); 1463 void gc_prologue(); 1464 1465 // Misc. operations 1466 char* name() const { return (char*)get_thread_name(); } 1467 void print_on(outputStream* st) const; 1468 void print() const { print_on(tty); } 1469 void print_value(); 1470 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; 1471 void print_thread_state() const PRODUCT_RETURN; 1472 void print_on_error(outputStream* st, char* buf, int buflen) const; 1473 void verify(); 1474 const char* get_thread_name() const; 1475 private: 1476 // factor out low-level mechanics for use in both normal and error cases 1477 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1478 public: 1479 const char* get_threadgroup_name() const; 1480 const char* get_parent_name() const; 1481 1482 // Accessing frames 1483 frame last_frame() { 1484 _anchor.make_walkable(this); 1485 return pd_last_frame(); 1486 } 1487 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1488 1489 // Returns method at 'depth' java or native frames down the stack 1490 // Used for security checks 1491 Klass* security_get_caller_class(int depth); 1492 1493 // Print stack trace in external format 1494 void print_stack_on(outputStream* st); 1495 void print_stack() { print_stack_on(tty); } 1496 1497 // Print stack traces in various internal formats 1498 void trace_stack() PRODUCT_RETURN; 1499 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1500 void trace_frames() PRODUCT_RETURN; 1501 void trace_oops() PRODUCT_RETURN; 1502 1503 // Print an annotated view of the stack frames 1504 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1505 void validate_frame_layout() { 1506 print_frame_layout(0, true); 1507 } 1508 1509 // Returns the number of stack frames on the stack 1510 int depth() const; 1511 1512 // Function for testing deoptimization 1513 void deoptimize(); 1514 void make_zombies(); 1515 1516 void deoptimized_wrt_marked_nmethods(); 1517 1518 // Profiling operation (see fprofile.cpp) 1519 public: 1520 bool profile_last_Java_frame(frame* fr); 1521 1522 private: 1523 ThreadProfiler* _thread_profiler; 1524 private: 1525 friend class FlatProfiler; // uses both [gs]et_thread_profiler. 1526 friend class FlatProfilerTask; // uses get_thread_profiler. 1527 friend class ThreadProfilerMark; // uses get_thread_profiler. 1528 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } 1529 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { 1530 ThreadProfiler* result = _thread_profiler; 1531 _thread_profiler = tp; 1532 return result; 1533 } 1534 1535 public: 1536 // Returns the running thread as a JavaThread 1537 static inline JavaThread* current(); 1538 1539 // Returns the active Java thread. Do not use this if you know you are calling 1540 // from a JavaThread, as it's slower than JavaThread::current. If called from 1541 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1542 // operation. You may not want that either. 1543 static JavaThread* active(); 1544 1545 inline CompilerThread* as_CompilerThread(); 1546 1547 public: 1548 virtual void run(); 1549 void thread_main_inner(); 1550 1551 private: 1552 // PRIVILEGED STACK 1553 PrivilegedElement* _privileged_stack_top; 1554 GrowableArray<oop>* _array_for_gc; 1555 public: 1556 1557 // Returns the privileged_stack information. 1558 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } 1559 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } 1560 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } 1561 1562 public: 1563 // Thread local information maintained by JVMTI. 1564 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1565 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1566 // getter is used to get this JavaThread's JvmtiThreadState if it has 1567 // one which means NULL can be returned. JvmtiThreadState::state_for() 1568 // is used to get the specified JavaThread's JvmtiThreadState if it has 1569 // one or it allocates a new JvmtiThreadState for the JavaThread and 1570 // returns it. JvmtiThreadState::state_for() will return NULL only if 1571 // the specified JavaThread is exiting. 1572 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1573 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1574 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } 1575 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } 1576 1577 // JVMTI PopFrame support 1578 // Setting and clearing popframe_condition 1579 // All of these enumerated values are bits. popframe_pending 1580 // indicates that a PopFrame() has been requested and not yet been 1581 // completed. popframe_processing indicates that that PopFrame() is in 1582 // the process of being completed. popframe_force_deopt_reexecution_bit 1583 // indicates that special handling is required when returning to a 1584 // deoptimized caller. 1585 enum PopCondition { 1586 popframe_inactive = 0x00, 1587 popframe_pending_bit = 0x01, 1588 popframe_processing_bit = 0x02, 1589 popframe_force_deopt_reexecution_bit = 0x04 1590 }; 1591 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1592 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1593 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1594 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1595 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1596 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1597 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1598 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1599 #ifdef CC_INTERP 1600 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } 1601 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } 1602 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1603 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1604 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1605 #endif 1606 1607 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1608 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1609 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1610 1611 private: 1612 // Saved incoming arguments to popped frame. 1613 // Used only when popped interpreted frame returns to deoptimized frame. 1614 void* _popframe_preserved_args; 1615 int _popframe_preserved_args_size; 1616 1617 public: 1618 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1619 void* popframe_preserved_args(); 1620 ByteSize popframe_preserved_args_size(); 1621 WordSize popframe_preserved_args_size_in_words(); 1622 void popframe_free_preserved_args(); 1623 1624 1625 private: 1626 JvmtiThreadState *_jvmti_thread_state; 1627 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; 1628 1629 // Used by the interpreter in fullspeed mode for frame pop, method 1630 // entry, method exit and single stepping support. This field is 1631 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. 1632 // It can be set to zero asynchronously (i.e., without a VM operation 1633 // or a lock) so we have to be very careful. 1634 int _interp_only_mode; 1635 1636 public: 1637 // used by the interpreter for fullspeed debugging support (see above) 1638 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1639 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1640 int get_interp_only_mode() { return _interp_only_mode; } 1641 void increment_interp_only_mode() { ++_interp_only_mode; } 1642 void decrement_interp_only_mode() { --_interp_only_mode; } 1643 1644 // support for cached flag that indicates whether exceptions need to be posted for this thread 1645 // if this is false, we can avoid deoptimizing when events are thrown 1646 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1647 private: 1648 int _should_post_on_exceptions_flag; 1649 1650 public: 1651 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1652 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1653 1654 private: 1655 ThreadStatistics *_thread_stat; 1656 1657 public: 1658 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1659 1660 // Return a blocker object for which this thread is blocked parking. 1661 oop current_park_blocker(); 1662 1663 private: 1664 static size_t _stack_size_at_create; 1665 1666 public: 1667 static inline size_t stack_size_at_create(void) { 1668 return _stack_size_at_create; 1669 } 1670 static inline void set_stack_size_at_create(size_t value) { 1671 _stack_size_at_create = value; 1672 } 1673 1674 #if INCLUDE_ALL_GCS 1675 // SATB marking queue support 1676 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } 1677 static SATBMarkQueueSet& satb_mark_queue_set() { 1678 return _satb_mark_queue_set; 1679 } 1680 1681 // Dirty card queue support 1682 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } 1683 static DirtyCardQueueSet& dirty_card_queue_set() { 1684 return _dirty_card_queue_set; 1685 } 1686 #endif // INCLUDE_ALL_GCS 1687 1688 // This method initializes the SATB and dirty card queues before a 1689 // JavaThread is added to the Java thread list. Right now, we don't 1690 // have to do anything to the dirty card queue (it should have been 1691 // activated when the thread was created), but we have to activate 1692 // the SATB queue if the thread is created while a marking cycle is 1693 // in progress. The activation / de-activation of the SATB queues at 1694 // the beginning / end of a marking cycle is done during safepoints 1695 // so we have to make sure this method is called outside one to be 1696 // able to safely read the active field of the SATB queue set. Right 1697 // now, it is called just before the thread is added to the Java 1698 // thread list in the Threads::add() method. That method is holding 1699 // the Threads_lock which ensures we are outside a safepoint. We 1700 // cannot do the obvious and set the active field of the SATB queue 1701 // when the thread is created given that, in some cases, safepoints 1702 // might happen between the JavaThread constructor being called and the 1703 // thread being added to the Java thread list (an example of this is 1704 // when the structure for the DestroyJavaVM thread is created). 1705 #if INCLUDE_ALL_GCS 1706 void initialize_queues(); 1707 #else // INCLUDE_ALL_GCS 1708 void initialize_queues() { } 1709 #endif // INCLUDE_ALL_GCS 1710 1711 // Machine dependent stuff 1712 #ifdef TARGET_OS_ARCH_linux_x86 1713 # include "thread_linux_x86.hpp" 1714 #endif 1715 #ifdef TARGET_OS_ARCH_linux_sparc 1716 # include "thread_linux_sparc.hpp" 1717 #endif 1718 #ifdef TARGET_OS_ARCH_linux_zero 1719 # include "thread_linux_zero.hpp" 1720 #endif 1721 #ifdef TARGET_OS_ARCH_solaris_x86 1722 # include "thread_solaris_x86.hpp" 1723 #endif 1724 #ifdef TARGET_OS_ARCH_solaris_sparc 1725 # include "thread_solaris_sparc.hpp" 1726 #endif 1727 #ifdef TARGET_OS_ARCH_windows_x86 1728 # include "thread_windows_x86.hpp" 1729 #endif 1730 #ifdef TARGET_OS_ARCH_linux_arm 1731 # include "thread_linux_arm.hpp" 1732 #endif 1733 #ifdef TARGET_OS_ARCH_linux_ppc 1734 # include "thread_linux_ppc.hpp" 1735 #endif 1736 #ifdef TARGET_OS_ARCH_aix_ppc 1737 # include "thread_aix_ppc.hpp" 1738 #endif 1739 #ifdef TARGET_OS_ARCH_bsd_x86 1740 # include "thread_bsd_x86.hpp" 1741 #endif 1742 #ifdef TARGET_OS_ARCH_bsd_zero 1743 # include "thread_bsd_zero.hpp" 1744 #endif 1745 1746 1747 public: 1748 void set_blocked_on_compilation(bool value) { 1749 _blocked_on_compilation = value; 1750 } 1751 1752 bool blocked_on_compilation() { 1753 return _blocked_on_compilation; 1754 } 1755 protected: 1756 bool _blocked_on_compilation; 1757 1758 1759 // JSR166 per-thread parker 1760 private: 1761 Parker* _parker; 1762 public: 1763 Parker* parker() { return _parker; } 1764 1765 // Biased locking support 1766 private: 1767 GrowableArray<MonitorInfo*>* _cached_monitor_info; 1768 public: 1769 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 1770 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 1771 1772 // clearing/querying jni attach status 1773 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1774 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1775 inline void set_done_attaching_via_jni(); 1776 private: 1777 // This field is used to determine if a thread has claimed 1778 // a par_id: it is UINT_MAX if the thread has not claimed a par_id; 1779 // otherwise its value is the par_id that has been claimed. 1780 uint _claimed_par_id; 1781 public: 1782 uint get_claimed_par_id() { return _claimed_par_id; } 1783 void set_claimed_par_id(uint id) { _claimed_par_id = id;} 1784 }; 1785 1786 // Inline implementation of JavaThread::current 1787 inline JavaThread* JavaThread::current() { 1788 Thread* thread = ThreadLocalStorage::thread(); 1789 assert(thread != NULL && thread->is_Java_thread(), "just checking"); 1790 return (JavaThread*)thread; 1791 } 1792 1793 inline CompilerThread* JavaThread::as_CompilerThread() { 1794 assert(is_Compiler_thread(), "just checking"); 1795 return (CompilerThread*)this; 1796 } 1797 1798 inline bool JavaThread::stack_guard_zone_unused() { 1799 return _stack_guard_state == stack_guard_unused; 1800 } 1801 1802 inline bool JavaThread::stack_yellow_zone_disabled() { 1803 return _stack_guard_state == stack_guard_yellow_disabled; 1804 } 1805 1806 inline bool JavaThread::stack_yellow_zone_enabled() { 1807 #ifdef ASSERT 1808 if (os::uses_stack_guard_pages() && 1809 !(DisablePrimordialThreadGuardPages && os::is_primordial_thread())) { 1810 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); 1811 } 1812 #endif 1813 return _stack_guard_state == stack_guard_enabled; 1814 } 1815 1816 inline size_t JavaThread::stack_available(address cur_sp) { 1817 // This code assumes java stacks grow down 1818 address low_addr; // Limit on the address for deepest stack depth 1819 if ( _stack_guard_state == stack_guard_unused) { 1820 low_addr = stack_base() - stack_size(); 1821 } else { 1822 low_addr = stack_yellow_zone_base(); 1823 } 1824 return cur_sp > low_addr ? cur_sp - low_addr : 0; 1825 } 1826 1827 // A thread used for Compilation. 1828 class CompilerThread : public JavaThread { 1829 friend class VMStructs; 1830 private: 1831 CompilerCounters* _counters; 1832 1833 ciEnv* _env; 1834 CompileLog* _log; 1835 CompileTask* _task; 1836 CompileQueue* _queue; 1837 BufferBlob* _buffer_blob; 1838 1839 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper 1840 AbstractCompiler* _compiler; 1841 1842 public: 1843 1844 static CompilerThread* current(); 1845 1846 CompilerThread(CompileQueue* queue, CompilerCounters* counters); 1847 1848 bool is_Compiler_thread() const { return true; } 1849 // Hide this compiler thread from external view. 1850 bool is_hidden_from_external_view() const { return true; } 1851 1852 void set_compiler(AbstractCompiler* c) { _compiler = c; } 1853 AbstractCompiler* compiler() const { return _compiler; } 1854 1855 CompileQueue* queue() const { return _queue; } 1856 CompilerCounters* counters() const { return _counters; } 1857 1858 // Get/set the thread's compilation environment. 1859 ciEnv* env() { return _env; } 1860 void set_env(ciEnv* env) { _env = env; } 1861 1862 BufferBlob* get_buffer_blob() const { return _buffer_blob; } 1863 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }; 1864 1865 // Get/set the thread's logging information 1866 CompileLog* log() { return _log; } 1867 void init_log(CompileLog* log) { 1868 // Set once, for good. 1869 assert(_log == NULL, "set only once"); 1870 _log = log; 1871 } 1872 1873 // GC support 1874 // Apply "f->do_oop" to all root oops in "this". 1875 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 1876 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1877 1878 #ifndef PRODUCT 1879 private: 1880 IdealGraphPrinter *_ideal_graph_printer; 1881 public: 1882 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } 1883 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } 1884 #endif 1885 1886 // Get/set the thread's current task 1887 CompileTask* task() { return _task; } 1888 void set_task(CompileTask* task) { _task = task; } 1889 1890 // Track the nmethod currently being scanned by the sweeper 1891 void set_scanned_nmethod(nmethod* nm) { 1892 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value"); 1893 _scanned_nmethod = nm; 1894 } 1895 }; 1896 1897 inline CompilerThread* CompilerThread::current() { 1898 return JavaThread::current()->as_CompilerThread(); 1899 } 1900 1901 1902 // The active thread queue. It also keeps track of the current used 1903 // thread priorities. 1904 class Threads: AllStatic { 1905 friend class VMStructs; 1906 private: 1907 static JavaThread* _thread_list; 1908 static int _number_of_threads; 1909 static int _number_of_non_daemon_threads; 1910 static int _return_code; 1911 #ifdef ASSERT 1912 static bool _vm_complete; 1913 #endif 1914 1915 public: 1916 // Thread management 1917 // force_daemon is a concession to JNI, where we may need to add a 1918 // thread to the thread list before allocating its thread object 1919 static void add(JavaThread* p, bool force_daemon = false); 1920 static void remove(JavaThread* p); 1921 static bool includes(JavaThread* p); 1922 static JavaThread* first() { return _thread_list; } 1923 static void threads_do(ThreadClosure* tc); 1924 1925 // Initializes the vm and creates the vm thread 1926 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 1927 static void convert_vm_init_libraries_to_agents(); 1928 static void create_vm_init_libraries(); 1929 static void create_vm_init_agents(); 1930 static void shutdown_vm_agents(); 1931 static bool destroy_vm(); 1932 // Supported VM versions via JNI 1933 // Includes JNI_VERSION_1_1 1934 static jboolean is_supported_jni_version_including_1_1(jint version); 1935 // Does not include JNI_VERSION_1_1 1936 static jboolean is_supported_jni_version(jint version); 1937 1938 // Garbage collection 1939 static void follow_other_roots(void f(oop*)); 1940 1941 // Apply "f->do_oop" to all root oops in all threads. 1942 // This version may only be called by sequential code. 1943 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1944 // This version may be called by sequential or parallel code. 1945 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1946 // This creates a list of GCTasks, one per thread. 1947 static void create_thread_roots_tasks(GCTaskQueue* q); 1948 // This creates a list of GCTasks, one per thread, for marking objects. 1949 static void create_thread_roots_marking_tasks(GCTaskQueue* q); 1950 1951 // Apply "f->do_oop" to roots in all threads that 1952 // are part of compiled frames 1953 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); 1954 1955 static void convert_hcode_pointers(); 1956 static void restore_hcode_pointers(); 1957 1958 // Sweeper 1959 static void nmethods_do(CodeBlobClosure* cf); 1960 1961 // RedefineClasses support 1962 static void metadata_do(void f(Metadata*)); 1963 1964 static void gc_epilogue(); 1965 static void gc_prologue(); 1966 #ifdef ASSERT 1967 static bool is_vm_complete() { return _vm_complete; } 1968 #endif 1969 1970 // Verification 1971 static void verify(); 1972 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); 1973 static void print(bool print_stacks, bool internal_format) { 1974 // this function is only used by debug.cpp 1975 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); 1976 } 1977 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 1978 1979 // Get Java threads that are waiting to enter a monitor. If doLock 1980 // is true, then Threads_lock is grabbed as needed. Otherwise, the 1981 // VM needs to be at a safepoint. 1982 static GrowableArray<JavaThread*>* get_pending_threads(int count, 1983 address monitor, bool doLock); 1984 1985 // Get owning Java thread from the monitor's owner field. If doLock 1986 // is true, then Threads_lock is grabbed as needed. Otherwise, the 1987 // VM needs to be at a safepoint. 1988 static JavaThread *owning_thread_from_monitor_owner(address owner, 1989 bool doLock); 1990 1991 // Number of threads on the active threads list 1992 static int number_of_threads() { return _number_of_threads; } 1993 // Number of non-daemon threads on the active threads list 1994 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 1995 1996 // Deoptimizes all frames tied to marked nmethods 1997 static void deoptimized_wrt_marked_nmethods(); 1998 1999 static JavaThread* find_java_thread_from_java_tid(jlong java_tid); 2000 2001 }; 2002 2003 2004 // Thread iterator 2005 class ThreadClosure: public StackObj { 2006 public: 2007 virtual void do_thread(Thread* thread) = 0; 2008 }; 2009 2010 class SignalHandlerMark: public StackObj { 2011 private: 2012 Thread* _thread; 2013 public: 2014 SignalHandlerMark(Thread* t) { 2015 _thread = t; 2016 if (_thread) _thread->enter_signal_handler(); 2017 } 2018 ~SignalHandlerMark() { 2019 if (_thread) _thread->leave_signal_handler(); 2020 _thread = NULL; 2021 } 2022 }; 2023 2024 2025 #endif // SHARE_VM_RUNTIME_THREAD_HPP