1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP 26 #define SHARE_VM_RUNTIME_THREAD_HPP 27 28 #include "memory/allocation.hpp" 29 #include "memory/threadLocalAllocBuffer.hpp" 30 #include "oops/oop.hpp" 31 #include "prims/jni.h" 32 #include "prims/jvmtiExport.hpp" 33 #include "runtime/frame.hpp" 34 #include "runtime/javaFrameAnchor.hpp" 35 #include "runtime/jniHandles.hpp" 36 #include "runtime/mutexLocker.hpp" 37 #include "runtime/os.hpp" 38 #include "runtime/osThread.hpp" 39 #include "runtime/park.hpp" 40 #include "runtime/safepoint.hpp" 41 #include "runtime/stubRoutines.hpp" 42 #include "runtime/threadLocalStorage.hpp" 43 #include "runtime/thread_ext.hpp" 44 #include "runtime/unhandledOops.hpp" 45 #include "trace/traceBackend.hpp" 46 #include "trace/traceMacros.hpp" 47 #include "utilities/exceptions.hpp" 48 #include "utilities/macros.hpp" 49 #include "utilities/top.hpp" 50 #if INCLUDE_ALL_GCS 51 #include "gc_implementation/g1/dirtyCardQueue.hpp" 52 #include "gc_implementation/g1/satbQueue.hpp" 53 #endif // INCLUDE_ALL_GCS 54 #ifdef ZERO 55 #ifdef TARGET_ARCH_zero 56 # include "stack_zero.hpp" 57 #endif 58 #endif 59 60 class ThreadSafepointState; 61 class ThreadProfiler; 62 63 class JvmtiThreadState; 64 class JvmtiGetLoadedClassesClosure; 65 class ThreadStatistics; 66 class ConcurrentLocksDump; 67 class ParkEvent; 68 class Parker; 69 70 class ciEnv; 71 class CompileThread; 72 class CompileLog; 73 class CompileTask; 74 class CompileQueue; 75 class CompilerCounters; 76 class vframeArray; 77 78 class DeoptResourceMark; 79 class jvmtiDeferredLocalVariableSet; 80 81 class GCTaskQueue; 82 class ThreadClosure; 83 class IdealGraphPrinter; 84 85 class Metadata; 86 template <class T, MEMFLAGS F> class ChunkedList; 87 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer; 88 89 DEBUG_ONLY(class ResourceMark;) 90 91 class WorkerThread; 92 93 // Class hierarchy 94 // - Thread 95 // - NamedThread 96 // - VMThread 97 // - ConcurrentGCThread 98 // - WorkerThread 99 // - GangWorker 100 // - GCTaskThread 101 // - JavaThread 102 // - WatcherThread 103 104 class Thread: public ThreadShadow { 105 friend class VMStructs; 106 private: 107 // Exception handling 108 // (Note: _pending_exception and friends are in ThreadShadow) 109 //oop _pending_exception; // pending exception for current thread 110 // const char* _exception_file; // file information for exception (debugging only) 111 // int _exception_line; // line information for exception (debugging only) 112 protected: 113 // Support for forcing alignment of thread objects for biased locking 114 void* _real_malloc_address; 115 public: 116 void* operator new(size_t size) throw() { return allocate(size, true); } 117 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 118 return allocate(size, false); } 119 void operator delete(void* p); 120 121 protected: 122 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 123 private: 124 125 // *************************************************************** 126 // Suspend and resume support 127 // *************************************************************** 128 // 129 // VM suspend/resume no longer exists - it was once used for various 130 // things including safepoints but was deprecated and finally removed 131 // in Java 7. Because VM suspension was considered "internal" Java-level 132 // suspension was considered "external", and this legacy naming scheme 133 // remains. 134 // 135 // External suspend/resume requests come from JVM_SuspendThread, 136 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI 137 // ResumeThread. External 138 // suspend requests cause _external_suspend to be set and external 139 // resume requests cause _external_suspend to be cleared. 140 // External suspend requests do not nest on top of other external 141 // suspend requests. The higher level APIs reject suspend requests 142 // for already suspended threads. 143 // 144 // The external_suspend 145 // flag is checked by has_special_runtime_exit_condition() and java thread 146 // will self-suspend when handle_special_runtime_exit_condition() is 147 // called. Most uses of the _thread_blocked state in JavaThreads are 148 // considered the same as being externally suspended; if the blocking 149 // condition lifts, the JavaThread will self-suspend. Other places 150 // where VM checks for external_suspend include: 151 // + mutex granting (do not enter monitors when thread is suspended) 152 // + state transitions from _thread_in_native 153 // 154 // In general, java_suspend() does not wait for an external suspend 155 // request to complete. When it returns, the only guarantee is that 156 // the _external_suspend field is true. 157 // 158 // wait_for_ext_suspend_completion() is used to wait for an external 159 // suspend request to complete. External suspend requests are usually 160 // followed by some other interface call that requires the thread to 161 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into 162 // the interface that requires quiescence, we give the JavaThread a 163 // chance to self-suspend before we need it to be quiescent. This 164 // improves overall suspend/query performance. 165 // 166 // _suspend_flags controls the behavior of java_ suspend/resume. 167 // It must be set under the protection of SR_lock. Read from the flag is 168 // OK without SR_lock as long as the value is only used as a hint. 169 // (e.g., check _external_suspend first without lock and then recheck 170 // inside SR_lock and finish the suspension) 171 // 172 // _suspend_flags is also overloaded for other "special conditions" so 173 // that a single check indicates whether any special action is needed 174 // eg. for async exceptions. 175 // ------------------------------------------------------------------- 176 // Notes: 177 // 1. The suspend/resume logic no longer uses ThreadState in OSThread 178 // but we still update its value to keep other part of the system (mainly 179 // JVMTI) happy. ThreadState is legacy code (see notes in 180 // osThread.hpp). 181 // 182 // 2. It would be more natural if set_external_suspend() is private and 183 // part of java_suspend(), but that probably would affect the suspend/query 184 // performance. Need more investigation on this. 185 // 186 187 // suspend/resume lock: used for self-suspend 188 Monitor* _SR_lock; 189 190 protected: 191 enum SuspendFlags { 192 // NOTE: avoid using the sign-bit as cc generates different test code 193 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 194 195 _external_suspend = 0x20000000U, // thread is asked to self suspend 196 _ext_suspended = 0x40000000U, // thread has self-suspended 197 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt 198 199 _has_async_exception = 0x00000001U, // there is a pending async exception 200 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock 201 }; 202 203 // various suspension related flags - atomically updated 204 // overloaded for async exception checking in check_special_condition_for_native_trans. 205 volatile uint32_t _suspend_flags; 206 207 private: 208 int _num_nested_signal; 209 210 public: 211 void enter_signal_handler() { _num_nested_signal++; } 212 void leave_signal_handler() { _num_nested_signal--; } 213 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } 214 215 private: 216 // Debug tracing 217 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; 218 219 // Active_handles points to a block of handles 220 JNIHandleBlock* _active_handles; 221 222 // One-element thread local free list 223 JNIHandleBlock* _free_handle_block; 224 225 // Point to the last handle mark 226 HandleMark* _last_handle_mark; 227 228 // The parity of the last strong_roots iteration in which this thread was 229 // claimed as a task. 230 jint _oops_do_parity; 231 232 public: 233 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 234 HandleMark* last_handle_mark() const { return _last_handle_mark; } 235 private: 236 237 // debug support for checking if code does allow safepoints or not 238 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on 239 // mutex, or blocking on an object synchronizer (Java locking). 240 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases 241 // If !allow_allocation(), then an assertion failure will happen during allocation 242 // (Hence, !allow_safepoint() => !allow_allocation()). 243 // 244 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. 245 // 246 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen 247 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. 248 249 // Used by SkipGCALot class. 250 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 251 252 friend class No_Alloc_Verifier; 253 friend class No_Safepoint_Verifier; 254 friend class Pause_No_Safepoint_Verifier; 255 friend class ThreadLocalStorage; 256 friend class GC_locker; 257 258 ThreadLocalAllocBuffer _tlab; // Thread-local eden 259 jlong _allocated_bytes; // Cumulative number of bytes allocated on 260 // the Java heap 261 262 // Thread-local buffer used by MetadataOnStackMark. 263 MetadataOnStackBuffer* _metadata_on_stack_buffer; 264 265 TRACE_DATA _trace_data; // Thread-local data for tracing 266 267 ThreadExt _ext; 268 269 int _vm_operation_started_count; // VM_Operation support 270 int _vm_operation_completed_count; // VM_Operation support 271 272 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread 273 // is waiting to lock 274 bool _current_pending_monitor_is_from_java; // locking is from Java code 275 276 // ObjectMonitor on which this thread called Object.wait() 277 ObjectMonitor* _current_waiting_monitor; 278 279 // Private thread-local objectmonitor list - a simple cache organized as a SLL. 280 public: 281 ObjectMonitor* omFreeList; 282 int omFreeCount; // length of omFreeList 283 int omFreeProvision; // reload chunk size 284 ObjectMonitor* omInUseList; // SLL to track monitors in circulation 285 int omInUseCount; // length of omInUseList 286 287 #ifdef ASSERT 288 private: 289 bool _visited_for_critical_count; 290 291 public: 292 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } 293 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } 294 #endif 295 296 public: 297 enum { 298 is_definitely_current_thread = true 299 }; 300 301 // Constructor 302 Thread(); 303 virtual ~Thread(); 304 305 // initializtion 306 void initialize_thread_local_storage(); 307 308 // thread entry point 309 virtual void run(); 310 311 // Testers 312 virtual bool is_VM_thread() const { return false; } 313 virtual bool is_Java_thread() const { return false; } 314 virtual bool is_Compiler_thread() const { return false; } 315 virtual bool is_hidden_from_external_view() const { return false; } 316 virtual bool is_jvmti_agent_thread() const { return false; } 317 // True iff the thread can perform GC operations at a safepoint. 318 // Generally will be true only of VM thread and parallel GC WorkGang 319 // threads. 320 virtual bool is_GC_task_thread() const { return false; } 321 virtual bool is_Watcher_thread() const { return false; } 322 virtual bool is_ConcurrentGC_thread() const { return false; } 323 virtual bool is_Named_thread() const { return false; } 324 virtual bool is_Worker_thread() const { return false; } 325 326 // Casts 327 virtual WorkerThread* as_Worker_thread() const { return NULL; } 328 329 virtual char* name() const { return (char*)"Unknown thread"; } 330 331 // Returns the current thread 332 static inline Thread* current(); 333 334 // Common thread operations 335 static void set_priority(Thread* thread, ThreadPriority priority); 336 static ThreadPriority get_priority(const Thread* const thread); 337 static void start(Thread* thread); 338 static void interrupt(Thread* thr); 339 static bool is_interrupted(Thread* thr, bool clear_interrupted); 340 341 void set_native_thread_name(const char *name) { 342 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); 343 os::set_native_thread_name(name); 344 } 345 346 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } 347 Monitor* SR_lock() const { return _SR_lock; } 348 349 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } 350 351 void set_suspend_flag(SuspendFlags f) { 352 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); 353 uint32_t flags; 354 do { 355 flags = _suspend_flags; 356 } 357 while (Atomic::cmpxchg((jint)(flags | f), 358 (volatile jint*)&_suspend_flags, 359 (jint)flags) != (jint)flags); 360 } 361 void clear_suspend_flag(SuspendFlags f) { 362 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); 363 uint32_t flags; 364 do { 365 flags = _suspend_flags; 366 } 367 while (Atomic::cmpxchg((jint)(flags & ~f), 368 (volatile jint*)&_suspend_flags, 369 (jint)flags) != (jint)flags); 370 } 371 372 void set_has_async_exception() { 373 set_suspend_flag(_has_async_exception); 374 } 375 void clear_has_async_exception() { 376 clear_suspend_flag(_has_async_exception); 377 } 378 379 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } 380 381 void set_critical_native_unlock() { 382 set_suspend_flag(_critical_native_unlock); 383 } 384 void clear_critical_native_unlock() { 385 clear_suspend_flag(_critical_native_unlock); 386 } 387 388 // Support for Unhandled Oop detection 389 #ifdef CHECK_UNHANDLED_OOPS 390 private: 391 UnhandledOops* _unhandled_oops; 392 public: 393 UnhandledOops* unhandled_oops() { return _unhandled_oops; } 394 // Mark oop safe for gc. It may be stack allocated but won't move. 395 void allow_unhandled_oop(oop *op) { 396 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); 397 } 398 // Clear oops at safepoint so crashes point to unhandled oop violator 399 void clear_unhandled_oops() { 400 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); 401 } 402 #endif // CHECK_UNHANDLED_OOPS 403 404 #ifndef PRODUCT 405 bool skip_gcalot() { return _skip_gcalot; } 406 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 407 #endif 408 409 public: 410 // Installs a pending exception to be inserted later 411 static void send_async_exception(oop thread_oop, oop java_throwable); 412 413 // Resource area 414 ResourceArea* resource_area() const { return _resource_area; } 415 void set_resource_area(ResourceArea* area) { _resource_area = area; } 416 417 OSThread* osthread() const { return _osthread; } 418 void set_osthread(OSThread* thread) { _osthread = thread; } 419 420 // JNI handle support 421 JNIHandleBlock* active_handles() const { return _active_handles; } 422 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 423 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 424 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 425 426 // Internal handle support 427 HandleArea* handle_area() const { return _handle_area; } 428 void set_handle_area(HandleArea* area) { _handle_area = area; } 429 430 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 431 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 432 433 // Thread-Local Allocation Buffer (TLAB) support 434 ThreadLocalAllocBuffer& tlab() { return _tlab; } 435 void initialize_tlab() { 436 if (UseTLAB) { 437 tlab().initialize(); 438 } 439 } 440 441 jlong allocated_bytes() { return _allocated_bytes; } 442 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 443 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 444 inline jlong cooked_allocated_bytes(); 445 446 TRACE_DATA* trace_data() { return &_trace_data; } 447 448 const ThreadExt& ext() const { return _ext; } 449 ThreadExt& ext() { return _ext; } 450 451 // VM operation support 452 int vm_operation_ticket() { return ++_vm_operation_started_count; } 453 int vm_operation_completed_count() { return _vm_operation_completed_count; } 454 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } 455 456 // For tracking the heavyweight monitor the thread is pending on. 457 ObjectMonitor* current_pending_monitor() { 458 return _current_pending_monitor; 459 } 460 void set_current_pending_monitor(ObjectMonitor* monitor) { 461 _current_pending_monitor = monitor; 462 } 463 void set_current_pending_monitor_is_from_java(bool from_java) { 464 _current_pending_monitor_is_from_java = from_java; 465 } 466 bool current_pending_monitor_is_from_java() { 467 return _current_pending_monitor_is_from_java; 468 } 469 470 // For tracking the ObjectMonitor on which this thread called Object.wait() 471 ObjectMonitor* current_waiting_monitor() { 472 return _current_waiting_monitor; 473 } 474 void set_current_waiting_monitor(ObjectMonitor* monitor) { 475 _current_waiting_monitor = monitor; 476 } 477 478 // GC support 479 // Apply "f->do_oop" to all root oops in "this". 480 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive. 481 // Used by JavaThread::oops_do. 482 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 483 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 484 485 // Handles the parallel case for the method below. 486 private: 487 bool claim_oops_do_par_case(int collection_parity); 488 public: 489 // Requires that "collection_parity" is that of the current roots 490 // iteration. If "is_par" is false, sets the parity of "this" to 491 // "collection_parity", and returns "true". If "is_par" is true, 492 // uses an atomic instruction to set the current threads parity to 493 // "collection_parity", if it is not already. Returns "true" iff the 494 // calling thread does the update, this indicates that the calling thread 495 // has claimed the thread's stack as a root groop in the current 496 // collection. 497 bool claim_oops_do(bool is_par, int collection_parity) { 498 if (!is_par) { 499 _oops_do_parity = collection_parity; 500 return true; 501 } else { 502 return claim_oops_do_par_case(collection_parity); 503 } 504 } 505 506 // Sweeper support 507 void nmethods_do(CodeBlobClosure* cf); 508 509 // jvmtiRedefineClasses support 510 void metadata_do(void f(Metadata*)); 511 512 // Used by fast lock support 513 virtual bool is_lock_owned(address adr) const; 514 515 // Check if address is in the stack of the thread (not just for locks). 516 // Warning: the method can only be used on the running thread 517 bool is_in_stack(address adr) const; 518 // Check if address is in the usable part of the stack (excludes protected 519 // guard pages) 520 bool is_in_usable_stack(address adr) const; 521 522 // Sets this thread as starting thread. Returns failure if thread 523 // creation fails due to lack of memory, too many threads etc. 524 bool set_as_starting_thread(); 525 526 void set_metadata_on_stack_buffer(MetadataOnStackBuffer* buffer) { _metadata_on_stack_buffer = buffer; } 527 MetadataOnStackBuffer* metadata_on_stack_buffer() const { return _metadata_on_stack_buffer; } 528 529 protected: 530 // OS data associated with the thread 531 OSThread* _osthread; // Platform-specific thread information 532 533 // Thread local resource area for temporary allocation within the VM 534 ResourceArea* _resource_area; 535 536 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 537 538 // Thread local handle area for allocation of handles within the VM 539 HandleArea* _handle_area; 540 GrowableArray<Metadata*>* _metadata_handles; 541 542 // Support for stack overflow handling, get_thread, etc. 543 address _stack_base; 544 size_t _stack_size; 545 uintptr_t _self_raw_id; // used by get_thread (mutable) 546 int _lgrp_id; 547 548 public: 549 // Stack overflow support 550 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 551 552 void set_stack_base(address base) { _stack_base = base; } 553 size_t stack_size() const { return _stack_size; } 554 void set_stack_size(size_t size) { _stack_size = size; } 555 void record_stack_base_and_size(); 556 557 bool on_local_stack(address adr) const { 558 /* QQQ this has knowledge of direction, ought to be a stack method */ 559 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); 560 } 561 562 uintptr_t self_raw_id() { return _self_raw_id; } 563 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } 564 565 int lgrp_id() const { return _lgrp_id; } 566 void set_lgrp_id(int value) { _lgrp_id = value; } 567 568 // Printing 569 void print_on(outputStream* st) const; 570 void print() const { print_on(tty); } 571 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 572 573 // Debug-only code 574 #ifdef ASSERT 575 private: 576 // Deadlock detection support for Mutex locks. List of locks own by thread. 577 Monitor* _owned_locks; 578 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 579 // thus the friendship 580 friend class Mutex; 581 friend class Monitor; 582 583 public: 584 void print_owned_locks_on(outputStream* st) const; 585 void print_owned_locks() const { print_owned_locks_on(tty); } 586 Monitor* owned_locks() const { return _owned_locks; } 587 bool owns_locks() const { return owned_locks() != NULL; } 588 bool owns_locks_but_compiled_lock() const; 589 590 // Deadlock detection 591 bool allow_allocation() { return _allow_allocation_count == 0; } 592 ResourceMark* current_resource_mark() { return _current_resource_mark; } 593 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 594 #endif 595 596 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; 597 598 private: 599 volatile int _jvmti_env_iteration_count; 600 601 public: 602 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 603 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 604 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 605 606 // Code generation 607 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } 608 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } 609 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } 610 611 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } 612 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } 613 614 #define TLAB_FIELD_OFFSET(name) \ 615 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } 616 617 TLAB_FIELD_OFFSET(start) 618 TLAB_FIELD_OFFSET(end) 619 TLAB_FIELD_OFFSET(top) 620 TLAB_FIELD_OFFSET(pf_top) 621 TLAB_FIELD_OFFSET(size) // desired_size 622 TLAB_FIELD_OFFSET(refill_waste_limit) 623 TLAB_FIELD_OFFSET(number_of_refills) 624 TLAB_FIELD_OFFSET(fast_refill_waste) 625 TLAB_FIELD_OFFSET(slow_allocations) 626 627 #undef TLAB_FIELD_OFFSET 628 629 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); } 630 631 public: 632 volatile intptr_t _Stalled ; 633 volatile int _TypeTag ; 634 ParkEvent * _ParkEvent ; // for synchronized() 635 ParkEvent * _SleepEvent ; // for Thread.sleep 636 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor 637 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease 638 int NativeSyncRecursion ; // diagnostic 639 640 volatile int _OnTrap ; // Resume-at IP delta 641 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG 642 jint _hashStateX ; // thread-specific hashCode generator state 643 jint _hashStateY ; 644 jint _hashStateZ ; 645 void * _schedctl ; 646 647 648 volatile jint rng [4] ; // RNG for spin loop 649 650 // Low-level leaf-lock primitives used to implement synchronization 651 // and native monitor-mutex infrastructure. 652 // Not for general synchronization use. 653 static void SpinAcquire (volatile int * Lock, const char * Name) ; 654 static void SpinRelease (volatile int * Lock) ; 655 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; 656 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; 657 static void muxRelease (volatile intptr_t * Lock) ; 658 }; 659 660 // Inline implementation of Thread::current() 661 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of 662 // startup. 663 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same 664 // period. This is inlined in thread_<os_family>.inline.hpp. 665 666 inline Thread* Thread::current() { 667 #ifdef ASSERT 668 // This function is very high traffic. Define PARANOID to enable expensive 669 // asserts. 670 #ifdef PARANOID 671 // Signal handler should call ThreadLocalStorage::get_thread_slow() 672 Thread* t = ThreadLocalStorage::get_thread_slow(); 673 assert(t != NULL && !t->is_inside_signal_handler(), 674 "Don't use Thread::current() inside signal handler"); 675 #endif 676 #endif 677 Thread* thread = ThreadLocalStorage::thread(); 678 assert(thread != NULL, "just checking"); 679 return thread; 680 } 681 682 // Name support for threads. non-JavaThread subclasses with multiple 683 // uniquely named instances should derive from this. 684 class NamedThread: public Thread { 685 friend class VMStructs; 686 enum { 687 max_name_len = 64 688 }; 689 private: 690 char* _name; 691 // log JavaThread being processed by oops_do 692 JavaThread* _processed_thread; 693 694 public: 695 NamedThread(); 696 ~NamedThread(); 697 // May only be called once per thread. 698 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); 699 virtual bool is_Named_thread() const { return true; } 700 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } 701 JavaThread *processed_thread() { return _processed_thread; } 702 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } 703 }; 704 705 // Worker threads are named and have an id of an assigned work. 706 class WorkerThread: public NamedThread { 707 private: 708 uint _id; 709 public: 710 WorkerThread() : _id(0) { } 711 virtual bool is_Worker_thread() const { return true; } 712 713 virtual WorkerThread* as_Worker_thread() const { 714 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); 715 return (WorkerThread*) this; 716 } 717 718 void set_id(uint work_id) { _id = work_id; } 719 uint id() const { return _id; } 720 }; 721 722 // A single WatcherThread is used for simulating timer interrupts. 723 class WatcherThread: public Thread { 724 friend class VMStructs; 725 public: 726 virtual void run(); 727 728 private: 729 static WatcherThread* _watcher_thread; 730 731 static bool _startable; 732 volatile static bool _should_terminate; // updated without holding lock 733 734 os::WatcherThreadCrashProtection* _crash_protection; 735 public: 736 enum SomeConstants { 737 delay_interval = 10 // interrupt delay in milliseconds 738 }; 739 740 // Constructor 741 WatcherThread(); 742 743 // Tester 744 bool is_Watcher_thread() const { return true; } 745 746 // Printing 747 char* name() const { return (char*)"VM Periodic Task Thread"; } 748 void print_on(outputStream* st) const; 749 void print() const { print_on(tty); } 750 void unpark(); 751 752 // Returns the single instance of WatcherThread 753 static WatcherThread* watcher_thread() { return _watcher_thread; } 754 755 // Create and start the single instance of WatcherThread, or stop it on shutdown 756 static void start(); 757 static void stop(); 758 // Only allow start once the VM is sufficiently initialized 759 // Otherwise the first task to enroll will trigger the start 760 static void make_startable(); 761 762 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) { 763 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread"); 764 _crash_protection = crash_protection; 765 } 766 767 bool has_crash_protection() const { return _crash_protection != NULL; } 768 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; } 769 770 private: 771 int sleep() const; 772 }; 773 774 775 class CompilerThread; 776 777 typedef void (*ThreadFunction)(JavaThread*, TRAPS); 778 779 class JavaThread: public Thread { 780 friend class VMStructs; 781 private: 782 JavaThread* _next; // The next thread in the Threads list 783 oop _threadObj; // The Java level thread object 784 785 #ifdef ASSERT 786 private: 787 int _java_call_counter; 788 789 public: 790 int java_call_counter() { return _java_call_counter; } 791 void inc_java_call_counter() { _java_call_counter++; } 792 void dec_java_call_counter() { 793 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 794 _java_call_counter--; 795 } 796 private: // restore original namespace restriction 797 #endif // ifdef ASSERT 798 799 #ifndef PRODUCT 800 public: 801 enum { 802 jump_ring_buffer_size = 16 803 }; 804 private: // restore original namespace restriction 805 #endif 806 807 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 808 809 ThreadFunction _entry_point; 810 811 JNIEnv _jni_environment; 812 813 // Deopt support 814 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 815 816 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we 817 // transition out of native 818 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized 819 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 820 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 821 // Because deoptimization is lazy we must save jvmti requests to set locals 822 // in compiled frames until we deoptimize and we have an interpreter frame. 823 // This holds the pointer to array (yeah like there might be more than one) of 824 // description of compiled vframes that have locals that need to be updated. 825 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; 826 827 // Handshake value for fixing 6243940. We need a place for the i2c 828 // adapter to store the callee Method*. This value is NEVER live 829 // across a gc point so it does NOT have to be gc'd 830 // The handshake is open ended since we can't be certain that it will 831 // be NULLed. This is because we rarely ever see the race and end up 832 // in handle_wrong_method which is the backend of the handshake. See 833 // code in i2c adapters and handle_wrong_method. 834 835 Method* _callee_target; 836 837 // Used to pass back results to the interpreter or generated code running Java code. 838 oop _vm_result; // oop result is GC-preserved 839 Metadata* _vm_result_2; // non-oop result 840 841 // See ReduceInitialCardMarks: this holds the precise space interval of 842 // the most recent slow path allocation for which compiled code has 843 // elided card-marks for performance along the fast-path. 844 MemRegion _deferred_card_mark; 845 846 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 847 // allocated during deoptimization 848 // and by JNI_MonitorEnter/Exit 849 850 // Async. requests support 851 enum AsyncRequests { 852 _no_async_condition = 0, 853 _async_exception, 854 _async_unsafe_access_error 855 }; 856 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request 857 oop _pending_async_exception; 858 859 // Safepoint support 860 public: // Expose _thread_state for SafeFetchInt() 861 volatile JavaThreadState _thread_state; 862 private: 863 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint 864 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 865 866 // JavaThread termination support 867 enum TerminatedTypes { 868 _not_terminated = 0xDEAD - 2, 869 _thread_exiting, // JavaThread::exit() has been called for this thread 870 _thread_terminated, // JavaThread is removed from thread list 871 _vm_exited // JavaThread is still executing native code, but VM is terminated 872 // only VM_Exit can set _vm_exited 873 }; 874 875 // In general a JavaThread's _terminated field transitions as follows: 876 // 877 // _not_terminated => _thread_exiting => _thread_terminated 878 // 879 // _vm_exited is a special value to cover the case of a JavaThread 880 // executing native code after the VM itself is terminated. 881 volatile TerminatedTypes _terminated; 882 // suspend/resume support 883 volatile bool _suspend_equivalent; // Suspend equivalent condition 884 jint _in_deopt_handler; // count of deoptimization 885 // handlers thread is in 886 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 887 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 888 // never locked) when throwing an exception. Used by interpreter only. 889 890 // JNI attach states: 891 enum JNIAttachStates { 892 _not_attaching_via_jni = 1, // thread is not attaching via JNI 893 _attaching_via_jni, // thread is attaching via JNI 894 _attached_via_jni // thread has attached via JNI 895 }; 896 897 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 898 // A native thread that is attaching via JNI starts with a value 899 // of _attaching_via_jni and transitions to _attached_via_jni. 900 volatile JNIAttachStates _jni_attach_state; 901 902 public: 903 // State of the stack guard pages for this thread. 904 enum StackGuardState { 905 stack_guard_unused, // not needed 906 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow 907 stack_guard_enabled // enabled 908 }; 909 910 private: 911 912 StackGuardState _stack_guard_state; 913 914 // Precompute the limit of the stack as used in stack overflow checks. 915 // We load it from here to simplify the stack overflow check in assembly. 916 address _stack_overflow_limit; 917 918 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 919 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 920 // code) 921 volatile oop _exception_oop; // Exception thrown in compiled code 922 volatile address _exception_pc; // PC where exception happened 923 volatile address _exception_handler_pc; // PC for handler of exception 924 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 925 926 // support for JNI critical regions 927 jint _jni_active_critical; // count of entries into JNI critical region 928 929 // Checked JNI: function name requires exception check 930 char* _pending_jni_exception_check_fn; 931 932 // For deadlock detection. 933 int _depth_first_number; 934 935 // JVMTI PopFrame support 936 // This is set to popframe_pending to signal that top Java frame should be popped immediately 937 int _popframe_condition; 938 939 // If reallocation of scalar replaced objects fails, we throw OOM 940 // and during exception propagation, pop the top 941 // _frames_to_pop_failed_realloc frames, the ones that reference 942 // failed reallocations. 943 int _frames_to_pop_failed_realloc; 944 945 #ifndef PRODUCT 946 int _jmp_ring_index; 947 struct { 948 // We use intptr_t instead of address so debugger doesn't try and display strings 949 intptr_t _target; 950 intptr_t _instruction; 951 const char* _file; 952 int _line; 953 } _jmp_ring[ jump_ring_buffer_size ]; 954 #endif /* PRODUCT */ 955 956 #if INCLUDE_ALL_GCS 957 // Support for G1 barriers 958 959 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. 960 // Set of all such queues. 961 static SATBMarkQueueSet _satb_mark_queue_set; 962 963 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. 964 // Set of all such queues. 965 static DirtyCardQueueSet _dirty_card_queue_set; 966 967 void flush_barrier_queues(); 968 #endif // INCLUDE_ALL_GCS 969 970 friend class VMThread; 971 friend class ThreadWaitTransition; 972 friend class VM_Exit; 973 974 void initialize(); // Initialized the instance variables 975 976 public: 977 // Constructor 978 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads 979 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 980 ~JavaThread(); 981 982 #ifdef ASSERT 983 // verify this JavaThread hasn't be published in the Threads::list yet 984 void verify_not_published(); 985 #endif 986 987 //JNI functiontable getter/setter for JVMTI jni function table interception API. 988 void set_jni_functions(struct JNINativeInterface_* functionTable) { 989 _jni_environment.functions = functionTable; 990 } 991 struct JNINativeInterface_* get_jni_functions() { 992 return (struct JNINativeInterface_ *)_jni_environment.functions; 993 } 994 995 // This function is called at thread creation to allow 996 // platform specific thread variables to be initialized. 997 void cache_global_variables(); 998 999 // Executes Shutdown.shutdown() 1000 void invoke_shutdown_hooks(); 1001 1002 // Cleanup on thread exit 1003 enum ExitType { 1004 normal_exit, 1005 jni_detach 1006 }; 1007 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 1008 1009 void cleanup_failed_attach_current_thread(); 1010 1011 // Testers 1012 virtual bool is_Java_thread() const { return true; } 1013 1014 // Thread chain operations 1015 JavaThread* next() const { return _next; } 1016 void set_next(JavaThread* p) { _next = p; } 1017 1018 // Thread oop. threadObj() can be NULL for initial JavaThread 1019 // (or for threads attached via JNI) 1020 oop threadObj() const { return _threadObj; } 1021 void set_threadObj(oop p) { _threadObj = p; } 1022 1023 ThreadPriority java_priority() const; // Read from threadObj() 1024 1025 // Prepare thread and add to priority queue. If a priority is 1026 // not specified, use the priority of the thread object. Threads_lock 1027 // must be held while this function is called. 1028 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 1029 void prepare_ext(); 1030 1031 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 1032 address saved_exception_pc() { return _saved_exception_pc; } 1033 1034 1035 ThreadFunction entry_point() const { return _entry_point; } 1036 1037 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1038 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); 1039 1040 // Last frame anchor routines 1041 1042 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1043 1044 // last_Java_sp 1045 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1046 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1047 1048 // last_Java_pc 1049 1050 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1051 1052 // Safepoint support 1053 #ifndef PPC64 1054 JavaThreadState thread_state() const { return _thread_state; } 1055 void set_thread_state(JavaThreadState s) { _thread_state = s; } 1056 #else 1057 // Use membars when accessing volatile _thread_state. See 1058 // Threads::create_vm() for size checks. 1059 inline JavaThreadState thread_state() const; 1060 inline void set_thread_state(JavaThreadState s); 1061 #endif 1062 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } 1063 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } 1064 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } 1065 1066 // thread has called JavaThread::exit() or is terminated 1067 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } 1068 // thread is terminated (no longer on the threads list); we compare 1069 // against the two non-terminated values so that a freed JavaThread 1070 // will also be considered terminated. 1071 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } 1072 void set_terminated(TerminatedTypes t) { _terminated = t; } 1073 // special for Threads::remove() which is static: 1074 void set_terminated_value() { _terminated = _thread_terminated; } 1075 void block_if_vm_exited(); 1076 1077 bool doing_unsafe_access() { return _doing_unsafe_access; } 1078 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1079 1080 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1081 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1082 1083 // Suspend/resume support for JavaThread 1084 private: 1085 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } 1086 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } 1087 1088 public: 1089 void java_suspend(); 1090 void java_resume(); 1091 int java_suspend_self(); 1092 1093 void check_and_wait_while_suspended() { 1094 assert(JavaThread::current() == this, "sanity check"); 1095 1096 bool do_self_suspend; 1097 do { 1098 // were we externally suspended while we were waiting? 1099 do_self_suspend = handle_special_suspend_equivalent_condition(); 1100 if (do_self_suspend) { 1101 // don't surprise the thread that suspended us by returning 1102 java_suspend_self(); 1103 set_suspend_equivalent(); 1104 } 1105 } while (do_self_suspend); 1106 } 1107 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); 1108 // Check for async exception in addition to safepoint and suspend request. 1109 static void check_special_condition_for_native_trans(JavaThread *thread); 1110 1111 // Same as check_special_condition_for_native_trans but finishes the 1112 // transition into thread_in_Java mode so that it can potentially 1113 // block. 1114 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); 1115 1116 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); 1117 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { 1118 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1119 // Warning: is_ext_suspend_completed() may temporarily drop the 1120 // SR_lock to allow the thread to reach a stable thread state if 1121 // it is currently in a transient thread state. 1122 return is_ext_suspend_completed(false /*!called_by_wait */, 1123 SuspendRetryDelay, bits); 1124 } 1125 1126 // We cannot allow wait_for_ext_suspend_completion() to run forever or 1127 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally 1128 // passed as the count and delay parameters. Experiments with specific 1129 // calls to wait_for_ext_suspend_completion() can be done by passing 1130 // other values in the code. Experiments with all calls can be done 1131 // via the appropriate -XX options. 1132 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); 1133 1134 void set_external_suspend() { set_suspend_flag (_external_suspend); } 1135 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } 1136 1137 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } 1138 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } 1139 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } 1140 1141 bool is_external_suspend() const { 1142 return (_suspend_flags & _external_suspend) != 0; 1143 } 1144 // Whenever a thread transitions from native to vm/java it must suspend 1145 // if external|deopt suspend is present. 1146 bool is_suspend_after_native() const { 1147 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; 1148 } 1149 1150 // external suspend request is completed 1151 bool is_ext_suspended() const { 1152 return (_suspend_flags & _ext_suspended) != 0; 1153 } 1154 1155 bool is_external_suspend_with_lock() const { 1156 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1157 return is_external_suspend(); 1158 } 1159 1160 // Special method to handle a pending external suspend request 1161 // when a suspend equivalent condition lifts. 1162 bool handle_special_suspend_equivalent_condition() { 1163 assert(is_suspend_equivalent(), 1164 "should only be called in a suspend equivalence condition"); 1165 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1166 bool ret = is_external_suspend(); 1167 if (!ret) { 1168 // not about to self-suspend so clear suspend equivalence 1169 clear_suspend_equivalent(); 1170 } 1171 // implied else: 1172 // We have a pending external suspend request so we leave the 1173 // suspend_equivalent flag set until java_suspend_self() sets 1174 // the ext_suspended flag and clears the suspend_equivalent 1175 // flag. This insures that wait_for_ext_suspend_completion() 1176 // will return consistent values. 1177 return ret; 1178 } 1179 1180 // utility methods to see if we are doing some kind of suspension 1181 bool is_being_ext_suspended() const { 1182 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1183 return is_ext_suspended() || is_external_suspend(); 1184 } 1185 1186 bool is_suspend_equivalent() const { return _suspend_equivalent; } 1187 1188 void set_suspend_equivalent() { _suspend_equivalent = true; }; 1189 void clear_suspend_equivalent() { _suspend_equivalent = false; }; 1190 1191 // Thread.stop support 1192 void send_thread_stop(oop throwable); 1193 AsyncRequests clear_special_runtime_exit_condition() { 1194 AsyncRequests x = _special_runtime_exit_condition; 1195 _special_runtime_exit_condition = _no_async_condition; 1196 return x; 1197 } 1198 1199 // Are any async conditions present? 1200 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } 1201 1202 void check_and_handle_async_exceptions(bool check_unsafe_error = true); 1203 1204 // these next two are also used for self-suspension and async exception support 1205 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1206 1207 // Return true if JavaThread has an asynchronous condition or 1208 // if external suspension is requested. 1209 bool has_special_runtime_exit_condition() { 1210 // We call is_external_suspend() last since external suspend should 1211 // be less common. Because we don't use is_external_suspend_with_lock 1212 // it is possible that we won't see an asynchronous external suspend 1213 // request that has just gotten started, i.e., SR_lock grabbed but 1214 // _external_suspend field change either not made yet or not visible 1215 // yet. However, this is okay because the request is asynchronous and 1216 // we will see the new flag value the next time through. It's also 1217 // possible that the external suspend request is dropped after 1218 // we have checked is_external_suspend(), we will recheck its value 1219 // under SR_lock in java_suspend_self(). 1220 return (_special_runtime_exit_condition != _no_async_condition) || 1221 is_external_suspend() || is_deopt_suspend(); 1222 } 1223 1224 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } 1225 1226 void set_pending_async_exception(oop e) { 1227 _pending_async_exception = e; 1228 _special_runtime_exit_condition = _async_exception; 1229 set_has_async_exception(); 1230 } 1231 1232 // Fast-locking support 1233 bool is_lock_owned(address adr) const; 1234 1235 // Accessors for vframe array top 1236 // The linked list of vframe arrays are sorted on sp. This means when we 1237 // unpack the head must contain the vframe array to unpack. 1238 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1239 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1240 1241 // Side structure for defering update of java frame locals until deopt occurs 1242 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } 1243 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } 1244 1245 // These only really exist to make debugging deopt problems simpler 1246 1247 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1248 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1249 1250 // The special resourceMark used during deoptimization 1251 1252 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1253 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1254 1255 intptr_t* must_deopt_id() { return _must_deopt_id; } 1256 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } 1257 void clear_must_deopt_id() { _must_deopt_id = NULL; } 1258 1259 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } 1260 nmethod* deopt_nmethod() { return _deopt_nmethod; } 1261 1262 Method* callee_target() const { return _callee_target; } 1263 void set_callee_target (Method* x) { _callee_target = x; } 1264 1265 // Oop results of vm runtime calls 1266 oop vm_result() const { return _vm_result; } 1267 void set_vm_result (oop x) { _vm_result = x; } 1268 1269 Metadata* vm_result_2() const { return _vm_result_2; } 1270 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1271 1272 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1273 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1274 1275 // Exception handling for compiled methods 1276 oop exception_oop() const { return _exception_oop; } 1277 address exception_pc() const { return _exception_pc; } 1278 address exception_handler_pc() const { return _exception_handler_pc; } 1279 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1280 1281 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); } 1282 void set_exception_pc(address a) { _exception_pc = a; } 1283 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1284 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1285 1286 void clear_exception_oop_and_pc() { 1287 set_exception_oop(NULL); 1288 set_exception_pc(NULL); 1289 } 1290 1291 // Stack overflow support 1292 inline size_t stack_available(address cur_sp); 1293 address stack_yellow_zone_base() 1294 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } 1295 size_t stack_yellow_zone_size() 1296 { return StackYellowPages * os::vm_page_size(); } 1297 address stack_red_zone_base() 1298 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } 1299 size_t stack_red_zone_size() 1300 { return StackRedPages * os::vm_page_size(); } 1301 bool in_stack_yellow_zone(address a) 1302 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } 1303 bool in_stack_red_zone(address a) 1304 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } 1305 1306 void create_stack_guard_pages(); 1307 void remove_stack_guard_pages(); 1308 1309 void enable_stack_yellow_zone(); 1310 void disable_stack_yellow_zone(); 1311 void enable_stack_red_zone(); 1312 void disable_stack_red_zone(); 1313 1314 inline bool stack_guard_zone_unused(); 1315 inline bool stack_yellow_zone_disabled(); 1316 inline bool stack_yellow_zone_enabled(); 1317 1318 // Attempt to reguard the stack after a stack overflow may have occurred. 1319 // Returns true if (a) guard pages are not needed on this thread, (b) the 1320 // pages are already guarded, or (c) the pages were successfully reguarded. 1321 // Returns false if there is not enough stack space to reguard the pages, in 1322 // which case the caller should unwind a frame and try again. The argument 1323 // should be the caller's (approximate) sp. 1324 bool reguard_stack(address cur_sp); 1325 // Similar to above but see if current stackpoint is out of the guard area 1326 // and reguard if possible. 1327 bool reguard_stack(void); 1328 1329 address stack_overflow_limit() { return _stack_overflow_limit; } 1330 void set_stack_overflow_limit() { 1331 _stack_overflow_limit = _stack_base - _stack_size + 1332 ((StackShadowPages + 1333 StackYellowPages + 1334 StackRedPages) * os::vm_page_size()); 1335 } 1336 1337 // Misc. accessors/mutators 1338 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1339 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1340 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1341 1342 #ifndef PRODUCT 1343 void record_jump(address target, address instr, const char* file, int line); 1344 #endif /* PRODUCT */ 1345 1346 // For assembly stub generation 1347 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } 1348 #ifndef PRODUCT 1349 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } 1350 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } 1351 #endif /* PRODUCT */ 1352 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } 1353 static ByteSize last_Java_sp_offset() { 1354 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1355 } 1356 static ByteSize last_Java_pc_offset() { 1357 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1358 } 1359 static ByteSize frame_anchor_offset() { 1360 return byte_offset_of(JavaThread, _anchor); 1361 } 1362 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } 1363 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } 1364 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } 1365 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } 1366 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } 1367 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } 1368 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } 1369 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } 1370 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1371 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } 1372 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1373 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } 1374 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } 1375 1376 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1377 static ByteSize should_post_on_exceptions_flag_offset() { 1378 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1379 } 1380 1381 #if INCLUDE_ALL_GCS 1382 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } 1383 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } 1384 #endif // INCLUDE_ALL_GCS 1385 1386 // Returns the jni environment for this thread 1387 JNIEnv* jni_environment() { return &_jni_environment; } 1388 1389 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1390 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1391 // Only return NULL if thread is off the thread list; starting to 1392 // exit should not return NULL. 1393 if (thread_from_jni_env->is_terminated()) { 1394 thread_from_jni_env->block_if_vm_exited(); 1395 return NULL; 1396 } else { 1397 return thread_from_jni_env; 1398 } 1399 } 1400 1401 // JNI critical regions. These can nest. 1402 bool in_critical() { return _jni_active_critical > 0; } 1403 bool in_last_critical() { return _jni_active_critical == 1; } 1404 void enter_critical() { assert(Thread::current() == this || 1405 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(), 1406 "this must be current thread or synchronizing"); 1407 _jni_active_critical++; } 1408 void exit_critical() { assert(Thread::current() == this, 1409 "this must be current thread"); 1410 _jni_active_critical--; 1411 assert(_jni_active_critical >= 0, 1412 "JNI critical nesting problem?"); } 1413 1414 // Checked JNI, is the programmer required to check for exceptions, specify which function name 1415 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1416 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1417 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1418 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1419 1420 // For deadlock detection 1421 int depth_first_number() { return _depth_first_number; } 1422 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1423 1424 private: 1425 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1426 1427 public: 1428 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1429 void add_monitor_chunk(MonitorChunk* chunk); 1430 void remove_monitor_chunk(MonitorChunk* chunk); 1431 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1432 void inc_in_deopt_handler() { _in_deopt_handler++; } 1433 void dec_in_deopt_handler() { 1434 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1435 if (_in_deopt_handler > 0) { // robustness 1436 _in_deopt_handler--; 1437 } 1438 } 1439 1440 private: 1441 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1442 1443 public: 1444 1445 // Frame iteration; calls the function f for all frames on the stack 1446 void frames_do(void f(frame*, const RegisterMap*)); 1447 1448 // Memory operations 1449 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1450 1451 // Sweeper operations 1452 void nmethods_do(CodeBlobClosure* cf); 1453 1454 // RedefineClasses Support 1455 void metadata_do(void f(Metadata*)); 1456 1457 // Memory management operations 1458 void gc_epilogue(); 1459 void gc_prologue(); 1460 1461 // Misc. operations 1462 char* name() const { return (char*)get_thread_name(); } 1463 void print_on(outputStream* st) const; 1464 void print() const { print_on(tty); } 1465 void print_value(); 1466 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; 1467 void print_thread_state() const PRODUCT_RETURN; 1468 void print_on_error(outputStream* st, char* buf, int buflen) const; 1469 void verify(); 1470 const char* get_thread_name() const; 1471 private: 1472 // factor out low-level mechanics for use in both normal and error cases 1473 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1474 public: 1475 const char* get_threadgroup_name() const; 1476 const char* get_parent_name() const; 1477 1478 // Accessing frames 1479 frame last_frame() { 1480 _anchor.make_walkable(this); 1481 return pd_last_frame(); 1482 } 1483 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1484 1485 // Returns method at 'depth' java or native frames down the stack 1486 // Used for security checks 1487 Klass* security_get_caller_class(int depth); 1488 1489 // Print stack trace in external format 1490 void print_stack_on(outputStream* st); 1491 void print_stack() { print_stack_on(tty); } 1492 1493 // Print stack traces in various internal formats 1494 void trace_stack() PRODUCT_RETURN; 1495 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1496 void trace_frames() PRODUCT_RETURN; 1497 void trace_oops() PRODUCT_RETURN; 1498 1499 // Print an annotated view of the stack frames 1500 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1501 void validate_frame_layout() { 1502 print_frame_layout(0, true); 1503 } 1504 1505 // Returns the number of stack frames on the stack 1506 int depth() const; 1507 1508 // Function for testing deoptimization 1509 void deoptimize(); 1510 void make_zombies(); 1511 1512 void deoptimized_wrt_marked_nmethods(); 1513 1514 // Profiling operation (see fprofile.cpp) 1515 public: 1516 bool profile_last_Java_frame(frame* fr); 1517 1518 private: 1519 ThreadProfiler* _thread_profiler; 1520 private: 1521 friend class FlatProfiler; // uses both [gs]et_thread_profiler. 1522 friend class FlatProfilerTask; // uses get_thread_profiler. 1523 friend class ThreadProfilerMark; // uses get_thread_profiler. 1524 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } 1525 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { 1526 ThreadProfiler* result = _thread_profiler; 1527 _thread_profiler = tp; 1528 return result; 1529 } 1530 1531 public: 1532 // Returns the running thread as a JavaThread 1533 static inline JavaThread* current(); 1534 1535 // Returns the active Java thread. Do not use this if you know you are calling 1536 // from a JavaThread, as it's slower than JavaThread::current. If called from 1537 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1538 // operation. You may not want that either. 1539 static JavaThread* active(); 1540 1541 inline CompilerThread* as_CompilerThread(); 1542 1543 public: 1544 virtual void run(); 1545 void thread_main_inner(); 1546 1547 private: 1548 // PRIVILEGED STACK 1549 PrivilegedElement* _privileged_stack_top; 1550 GrowableArray<oop>* _array_for_gc; 1551 public: 1552 1553 // Returns the privileged_stack information. 1554 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } 1555 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } 1556 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } 1557 1558 public: 1559 // Thread local information maintained by JVMTI. 1560 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1561 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1562 // getter is used to get this JavaThread's JvmtiThreadState if it has 1563 // one which means NULL can be returned. JvmtiThreadState::state_for() 1564 // is used to get the specified JavaThread's JvmtiThreadState if it has 1565 // one or it allocates a new JvmtiThreadState for the JavaThread and 1566 // returns it. JvmtiThreadState::state_for() will return NULL only if 1567 // the specified JavaThread is exiting. 1568 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1569 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1570 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } 1571 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } 1572 1573 // JVMTI PopFrame support 1574 // Setting and clearing popframe_condition 1575 // All of these enumerated values are bits. popframe_pending 1576 // indicates that a PopFrame() has been requested and not yet been 1577 // completed. popframe_processing indicates that that PopFrame() is in 1578 // the process of being completed. popframe_force_deopt_reexecution_bit 1579 // indicates that special handling is required when returning to a 1580 // deoptimized caller. 1581 enum PopCondition { 1582 popframe_inactive = 0x00, 1583 popframe_pending_bit = 0x01, 1584 popframe_processing_bit = 0x02, 1585 popframe_force_deopt_reexecution_bit = 0x04 1586 }; 1587 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1588 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1589 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1590 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1591 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1592 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1593 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1594 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1595 #ifdef CC_INTERP 1596 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } 1597 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } 1598 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1599 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1600 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1601 #endif 1602 1603 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1604 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1605 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1606 1607 private: 1608 // Saved incoming arguments to popped frame. 1609 // Used only when popped interpreted frame returns to deoptimized frame. 1610 void* _popframe_preserved_args; 1611 int _popframe_preserved_args_size; 1612 1613 public: 1614 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1615 void* popframe_preserved_args(); 1616 ByteSize popframe_preserved_args_size(); 1617 WordSize popframe_preserved_args_size_in_words(); 1618 void popframe_free_preserved_args(); 1619 1620 1621 private: 1622 JvmtiThreadState *_jvmti_thread_state; 1623 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; 1624 1625 // Used by the interpreter in fullspeed mode for frame pop, method 1626 // entry, method exit and single stepping support. This field is 1627 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. 1628 // It can be set to zero asynchronously (i.e., without a VM operation 1629 // or a lock) so we have to be very careful. 1630 int _interp_only_mode; 1631 1632 public: 1633 // used by the interpreter for fullspeed debugging support (see above) 1634 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1635 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1636 int get_interp_only_mode() { return _interp_only_mode; } 1637 void increment_interp_only_mode() { ++_interp_only_mode; } 1638 void decrement_interp_only_mode() { --_interp_only_mode; } 1639 1640 // support for cached flag that indicates whether exceptions need to be posted for this thread 1641 // if this is false, we can avoid deoptimizing when events are thrown 1642 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1643 private: 1644 int _should_post_on_exceptions_flag; 1645 1646 public: 1647 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1648 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1649 1650 private: 1651 ThreadStatistics *_thread_stat; 1652 1653 public: 1654 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1655 1656 // Return a blocker object for which this thread is blocked parking. 1657 oop current_park_blocker(); 1658 1659 private: 1660 static size_t _stack_size_at_create; 1661 1662 public: 1663 static inline size_t stack_size_at_create(void) { 1664 return _stack_size_at_create; 1665 } 1666 static inline void set_stack_size_at_create(size_t value) { 1667 _stack_size_at_create = value; 1668 } 1669 1670 #if INCLUDE_ALL_GCS 1671 // SATB marking queue support 1672 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } 1673 static SATBMarkQueueSet& satb_mark_queue_set() { 1674 return _satb_mark_queue_set; 1675 } 1676 1677 // Dirty card queue support 1678 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } 1679 static DirtyCardQueueSet& dirty_card_queue_set() { 1680 return _dirty_card_queue_set; 1681 } 1682 #endif // INCLUDE_ALL_GCS 1683 1684 // This method initializes the SATB and dirty card queues before a 1685 // JavaThread is added to the Java thread list. Right now, we don't 1686 // have to do anything to the dirty card queue (it should have been 1687 // activated when the thread was created), but we have to activate 1688 // the SATB queue if the thread is created while a marking cycle is 1689 // in progress. The activation / de-activation of the SATB queues at 1690 // the beginning / end of a marking cycle is done during safepoints 1691 // so we have to make sure this method is called outside one to be 1692 // able to safely read the active field of the SATB queue set. Right 1693 // now, it is called just before the thread is added to the Java 1694 // thread list in the Threads::add() method. That method is holding 1695 // the Threads_lock which ensures we are outside a safepoint. We 1696 // cannot do the obvious and set the active field of the SATB queue 1697 // when the thread is created given that, in some cases, safepoints 1698 // might happen between the JavaThread constructor being called and the 1699 // thread being added to the Java thread list (an example of this is 1700 // when the structure for the DestroyJavaVM thread is created). 1701 #if INCLUDE_ALL_GCS 1702 void initialize_queues(); 1703 #else // INCLUDE_ALL_GCS 1704 void initialize_queues() { } 1705 #endif // INCLUDE_ALL_GCS 1706 1707 // Machine dependent stuff 1708 #ifdef TARGET_OS_ARCH_linux_x86 1709 # include "thread_linux_x86.hpp" 1710 #endif 1711 #ifdef TARGET_OS_ARCH_linux_sparc 1712 # include "thread_linux_sparc.hpp" 1713 #endif 1714 #ifdef TARGET_OS_ARCH_linux_zero 1715 # include "thread_linux_zero.hpp" 1716 #endif 1717 #ifdef TARGET_OS_ARCH_solaris_x86 1718 # include "thread_solaris_x86.hpp" 1719 #endif 1720 #ifdef TARGET_OS_ARCH_solaris_sparc 1721 # include "thread_solaris_sparc.hpp" 1722 #endif 1723 #ifdef TARGET_OS_ARCH_windows_x86 1724 # include "thread_windows_x86.hpp" 1725 #endif 1726 #ifdef TARGET_OS_ARCH_linux_arm 1727 # include "thread_linux_arm.hpp" 1728 #endif 1729 #ifdef TARGET_OS_ARCH_linux_ppc 1730 # include "thread_linux_ppc.hpp" 1731 #endif 1732 #ifdef TARGET_OS_ARCH_aix_ppc 1733 # include "thread_aix_ppc.hpp" 1734 #endif 1735 #ifdef TARGET_OS_ARCH_bsd_x86 1736 # include "thread_bsd_x86.hpp" 1737 #endif 1738 #ifdef TARGET_OS_ARCH_bsd_zero 1739 # include "thread_bsd_zero.hpp" 1740 #endif 1741 1742 1743 public: 1744 void set_blocked_on_compilation(bool value) { 1745 _blocked_on_compilation = value; 1746 } 1747 1748 bool blocked_on_compilation() { 1749 return _blocked_on_compilation; 1750 } 1751 protected: 1752 bool _blocked_on_compilation; 1753 1754 1755 // JSR166 per-thread parker 1756 private: 1757 Parker* _parker; 1758 public: 1759 Parker* parker() { return _parker; } 1760 1761 // Biased locking support 1762 private: 1763 GrowableArray<MonitorInfo*>* _cached_monitor_info; 1764 public: 1765 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 1766 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 1767 1768 // clearing/querying jni attach status 1769 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1770 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1771 inline void set_done_attaching_via_jni(); 1772 private: 1773 // This field is used to determine if a thread has claimed 1774 // a par_id: it is UINT_MAX if the thread has not claimed a par_id; 1775 // otherwise its value is the par_id that has been claimed. 1776 uint _claimed_par_id; 1777 public: 1778 uint get_claimed_par_id() { return _claimed_par_id; } 1779 void set_claimed_par_id(uint id) { _claimed_par_id = id;} 1780 }; 1781 1782 // Inline implementation of JavaThread::current 1783 inline JavaThread* JavaThread::current() { 1784 Thread* thread = ThreadLocalStorage::thread(); 1785 assert(thread != NULL && thread->is_Java_thread(), "just checking"); 1786 return (JavaThread*)thread; 1787 } 1788 1789 inline CompilerThread* JavaThread::as_CompilerThread() { 1790 assert(is_Compiler_thread(), "just checking"); 1791 return (CompilerThread*)this; 1792 } 1793 1794 inline bool JavaThread::stack_guard_zone_unused() { 1795 return _stack_guard_state == stack_guard_unused; 1796 } 1797 1798 inline bool JavaThread::stack_yellow_zone_disabled() { 1799 return _stack_guard_state == stack_guard_yellow_disabled; 1800 } 1801 1802 inline bool JavaThread::stack_yellow_zone_enabled() { 1803 #ifdef ASSERT 1804 if (os::uses_stack_guard_pages() && 1805 !(DisablePrimordialThreadGuardPages && os::is_primordial_thread())) { 1806 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); 1807 } 1808 #endif 1809 return _stack_guard_state == stack_guard_enabled; 1810 } 1811 1812 inline size_t JavaThread::stack_available(address cur_sp) { 1813 // This code assumes java stacks grow down 1814 address low_addr; // Limit on the address for deepest stack depth 1815 if ( _stack_guard_state == stack_guard_unused) { 1816 low_addr = stack_base() - stack_size(); 1817 } else { 1818 low_addr = stack_yellow_zone_base(); 1819 } 1820 return cur_sp > low_addr ? cur_sp - low_addr : 0; 1821 } 1822 1823 // A thread used for Compilation. 1824 class CompilerThread : public JavaThread { 1825 friend class VMStructs; 1826 private: 1827 CompilerCounters* _counters; 1828 1829 ciEnv* _env; 1830 CompileLog* _log; 1831 CompileTask* _task; 1832 CompileQueue* _queue; 1833 BufferBlob* _buffer_blob; 1834 1835 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper 1836 AbstractCompiler* _compiler; 1837 1838 public: 1839 1840 static CompilerThread* current(); 1841 1842 CompilerThread(CompileQueue* queue, CompilerCounters* counters); 1843 1844 bool is_Compiler_thread() const { return true; } 1845 // Hide this compiler thread from external view. 1846 bool is_hidden_from_external_view() const { return true; } 1847 1848 void set_compiler(AbstractCompiler* c) { _compiler = c; } 1849 AbstractCompiler* compiler() const { return _compiler; } 1850 1851 CompileQueue* queue() const { return _queue; } 1852 CompilerCounters* counters() const { return _counters; } 1853 1854 // Get/set the thread's compilation environment. 1855 ciEnv* env() { return _env; } 1856 void set_env(ciEnv* env) { _env = env; } 1857 1858 BufferBlob* get_buffer_blob() const { return _buffer_blob; } 1859 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }; 1860 1861 // Get/set the thread's logging information 1862 CompileLog* log() { return _log; } 1863 void init_log(CompileLog* log) { 1864 // Set once, for good. 1865 assert(_log == NULL, "set only once"); 1866 _log = log; 1867 } 1868 1869 // GC support 1870 // Apply "f->do_oop" to all root oops in "this". 1871 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 1872 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1873 1874 #ifndef PRODUCT 1875 private: 1876 IdealGraphPrinter *_ideal_graph_printer; 1877 public: 1878 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } 1879 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } 1880 #endif 1881 1882 // Get/set the thread's current task 1883 CompileTask* task() { return _task; } 1884 void set_task(CompileTask* task) { _task = task; } 1885 1886 // Track the nmethod currently being scanned by the sweeper 1887 void set_scanned_nmethod(nmethod* nm) { 1888 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value"); 1889 _scanned_nmethod = nm; 1890 } 1891 }; 1892 1893 inline CompilerThread* CompilerThread::current() { 1894 return JavaThread::current()->as_CompilerThread(); 1895 } 1896 1897 1898 // The active thread queue. It also keeps track of the current used 1899 // thread priorities. 1900 class Threads: AllStatic { 1901 friend class VMStructs; 1902 private: 1903 static JavaThread* _thread_list; 1904 static int _number_of_threads; 1905 static int _number_of_non_daemon_threads; 1906 static int _return_code; 1907 #ifdef ASSERT 1908 static bool _vm_complete; 1909 #endif 1910 1911 public: 1912 // Thread management 1913 // force_daemon is a concession to JNI, where we may need to add a 1914 // thread to the thread list before allocating its thread object 1915 static void add(JavaThread* p, bool force_daemon = false); 1916 static void remove(JavaThread* p); 1917 static bool includes(JavaThread* p); 1918 static JavaThread* first() { return _thread_list; } 1919 static void threads_do(ThreadClosure* tc); 1920 1921 // Initializes the vm and creates the vm thread 1922 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 1923 static void convert_vm_init_libraries_to_agents(); 1924 static void create_vm_init_libraries(); 1925 static void create_vm_init_agents(); 1926 static void shutdown_vm_agents(); 1927 static bool destroy_vm(); 1928 // Supported VM versions via JNI 1929 // Includes JNI_VERSION_1_1 1930 static jboolean is_supported_jni_version_including_1_1(jint version); 1931 // Does not include JNI_VERSION_1_1 1932 static jboolean is_supported_jni_version(jint version); 1933 1934 // Garbage collection 1935 static void follow_other_roots(void f(oop*)); 1936 1937 // Apply "f->do_oop" to all root oops in all threads. 1938 // This version may only be called by sequential code. 1939 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1940 // This version may be called by sequential or parallel code. 1941 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1942 // This creates a list of GCTasks, one per thread. 1943 static void create_thread_roots_tasks(GCTaskQueue* q); 1944 // This creates a list of GCTasks, one per thread, for marking objects. 1945 static void create_thread_roots_marking_tasks(GCTaskQueue* q); 1946 1947 // Apply "f->do_oop" to roots in all threads that 1948 // are part of compiled frames 1949 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); 1950 1951 static void convert_hcode_pointers(); 1952 static void restore_hcode_pointers(); 1953 1954 // Sweeper 1955 static void nmethods_do(CodeBlobClosure* cf); 1956 1957 // RedefineClasses support 1958 static void metadata_do(void f(Metadata*)); 1959 1960 static void gc_epilogue(); 1961 static void gc_prologue(); 1962 #ifdef ASSERT 1963 static bool is_vm_complete() { return _vm_complete; } 1964 #endif 1965 1966 // Verification 1967 static void verify(); 1968 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); 1969 static void print(bool print_stacks, bool internal_format) { 1970 // this function is only used by debug.cpp 1971 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); 1972 } 1973 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 1974 1975 // Get Java threads that are waiting to enter a monitor. If doLock 1976 // is true, then Threads_lock is grabbed as needed. Otherwise, the 1977 // VM needs to be at a safepoint. 1978 static GrowableArray<JavaThread*>* get_pending_threads(int count, 1979 address monitor, bool doLock); 1980 1981 // Get owning Java thread from the monitor's owner field. If doLock 1982 // is true, then Threads_lock is grabbed as needed. Otherwise, the 1983 // VM needs to be at a safepoint. 1984 static JavaThread *owning_thread_from_monitor_owner(address owner, 1985 bool doLock); 1986 1987 // Number of threads on the active threads list 1988 static int number_of_threads() { return _number_of_threads; } 1989 // Number of non-daemon threads on the active threads list 1990 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 1991 1992 // Deoptimizes all frames tied to marked nmethods 1993 static void deoptimized_wrt_marked_nmethods(); 1994 1995 static JavaThread* find_java_thread_from_java_tid(jlong java_tid); 1996 1997 }; 1998 1999 2000 // Thread iterator 2001 class ThreadClosure: public StackObj { 2002 public: 2003 virtual void do_thread(Thread* thread) = 0; 2004 }; 2005 2006 class SignalHandlerMark: public StackObj { 2007 private: 2008 Thread* _thread; 2009 public: 2010 SignalHandlerMark(Thread* t) { 2011 _thread = t; 2012 if (_thread) _thread->enter_signal_handler(); 2013 } 2014 ~SignalHandlerMark() { 2015 if (_thread) _thread->leave_signal_handler(); 2016 _thread = NULL; 2017 } 2018 }; 2019 2020 2021 #endif // SHARE_VM_RUNTIME_THREAD_HPP