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