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