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