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