thread.hpp revision 3602:da91efe96a93
1/* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_THREAD_HPP 26#define SHARE_VM_RUNTIME_THREAD_HPP 27 28#include "memory/allocation.hpp" 29#include "memory/threadLocalAllocBuffer.hpp" 30#include "oops/oop.hpp" 31#include "prims/jni.h" 32#include "prims/jvmtiExport.hpp" 33#include "runtime/frame.hpp" 34#include "runtime/javaFrameAnchor.hpp" 35#include "runtime/jniHandles.hpp" 36#include "runtime/mutexLocker.hpp" 37#include "runtime/os.hpp" 38#include "runtime/osThread.hpp" 39#include "runtime/park.hpp" 40#include "runtime/safepoint.hpp" 41#include "runtime/stubRoutines.hpp" 42#include "runtime/threadLocalStorage.hpp" 43#include "runtime/unhandledOops.hpp" 44#include "services/memRecorder.hpp" 45#include "trace/tracing.hpp" 46#include "utilities/exceptions.hpp" 47#include "utilities/top.hpp" 48#ifndef SERIALGC 49#include "gc_implementation/g1/dirtyCardQueue.hpp" 50#include "gc_implementation/g1/satbQueue.hpp" 51#endif 52#ifdef ZERO 53#ifdef TARGET_ARCH_zero 54# include "stack_zero.hpp" 55#endif 56#endif 57 58class ThreadSafepointState; 59class ThreadProfiler; 60 61class JvmtiThreadState; 62class JvmtiGetLoadedClassesClosure; 63class ThreadStatistics; 64class ConcurrentLocksDump; 65class ParkEvent; 66class Parker; 67 68class ciEnv; 69class CompileThread; 70class CompileLog; 71class CompileTask; 72class CompileQueue; 73class CompilerCounters; 74class vframeArray; 75 76class DeoptResourceMark; 77class jvmtiDeferredLocalVariableSet; 78 79class GCTaskQueue; 80class ThreadClosure; 81class IdealGraphPrinter; 82 83class WorkerThread; 84 85// Class hierarchy 86// - Thread 87// - NamedThread 88// - VMThread 89// - ConcurrentGCThread 90// - WorkerThread 91// - GangWorker 92// - GCTaskThread 93// - JavaThread 94// - WatcherThread 95 96class Thread: public ThreadShadow { 97 friend class VMStructs; 98 private: 99 // Exception handling 100 // (Note: _pending_exception and friends are in ThreadShadow) 101 //oop _pending_exception; // pending exception for current thread 102 // const char* _exception_file; // file information for exception (debugging only) 103 // int _exception_line; // line information for exception (debugging only) 104 protected: 105 // Support for forcing alignment of thread objects for biased locking 106 void* _real_malloc_address; 107 public: 108 void* operator new(size_t size) { return allocate(size, true); } 109 void* operator new(size_t size, std::nothrow_t& nothrow_constant) { return allocate(size, false); } 110 void operator delete(void* p); 111 112 protected: 113 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 114 private: 115 116 // *************************************************************** 117 // Suspend and resume support 118 // *************************************************************** 119 // 120 // VM suspend/resume no longer exists - it was once used for various 121 // things including safepoints but was deprecated and finally removed 122 // in Java 7. Because VM suspension was considered "internal" Java-level 123 // suspension was considered "external", and this legacy naming scheme 124 // remains. 125 // 126 // External suspend/resume requests come from JVM_SuspendThread, 127 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI 128 // ResumeThread. External 129 // suspend requests cause _external_suspend to be set and external 130 // resume requests cause _external_suspend to be cleared. 131 // External suspend requests do not nest on top of other external 132 // suspend requests. The higher level APIs reject suspend requests 133 // for already suspended threads. 134 // 135 // The external_suspend 136 // flag is checked by has_special_runtime_exit_condition() and java thread 137 // will self-suspend when handle_special_runtime_exit_condition() is 138 // called. Most uses of the _thread_blocked state in JavaThreads are 139 // considered the same as being externally suspended; if the blocking 140 // condition lifts, the JavaThread will self-suspend. Other places 141 // where VM checks for external_suspend include: 142 // + mutex granting (do not enter monitors when thread is suspended) 143 // + state transitions from _thread_in_native 144 // 145 // In general, java_suspend() does not wait for an external suspend 146 // request to complete. When it returns, the only guarantee is that 147 // the _external_suspend field is true. 148 // 149 // wait_for_ext_suspend_completion() is used to wait for an external 150 // suspend request to complete. External suspend requests are usually 151 // followed by some other interface call that requires the thread to 152 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into 153 // the interface that requires quiescence, we give the JavaThread a 154 // chance to self-suspend before we need it to be quiescent. This 155 // improves overall suspend/query performance. 156 // 157 // _suspend_flags controls the behavior of java_ suspend/resume. 158 // It must be set under the protection of SR_lock. Read from the flag is 159 // OK without SR_lock as long as the value is only used as a hint. 160 // (e.g., check _external_suspend first without lock and then recheck 161 // inside SR_lock and finish the suspension) 162 // 163 // _suspend_flags is also overloaded for other "special conditions" so 164 // that a single check indicates whether any special action is needed 165 // eg. for async exceptions. 166 // ------------------------------------------------------------------- 167 // Notes: 168 // 1. The suspend/resume logic no longer uses ThreadState in OSThread 169 // but we still update its value to keep other part of the system (mainly 170 // JVMTI) happy. ThreadState is legacy code (see notes in 171 // osThread.hpp). 172 // 173 // 2. It would be more natural if set_external_suspend() is private and 174 // part of java_suspend(), but that probably would affect the suspend/query 175 // performance. Need more investigation on this. 176 // 177 178 // suspend/resume lock: used for self-suspend 179 Monitor* _SR_lock; 180 181 protected: 182 enum SuspendFlags { 183 // NOTE: avoid using the sign-bit as cc generates different test code 184 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 185 186 _external_suspend = 0x20000000U, // thread is asked to self suspend 187 _ext_suspended = 0x40000000U, // thread has self-suspended 188 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt 189 190 _has_async_exception = 0x00000001U, // there is a pending async exception 191 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock 192 }; 193 194 // various suspension related flags - atomically updated 195 // overloaded for async exception checking in check_special_condition_for_native_trans. 196 volatile uint32_t _suspend_flags; 197 198 private: 199 int _num_nested_signal; 200 201 public: 202 void enter_signal_handler() { _num_nested_signal++; } 203 void leave_signal_handler() { _num_nested_signal--; } 204 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } 205 206 private: 207 // Debug tracing 208 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; 209 210 // Active_handles points to a block of handles 211 JNIHandleBlock* _active_handles; 212 213 // One-element thread local free list 214 JNIHandleBlock* _free_handle_block; 215 216 // Point to the last handle mark 217 HandleMark* _last_handle_mark; 218 219 // The parity of the last strong_roots iteration in which this thread was 220 // claimed as a task. 221 jint _oops_do_parity; 222 223 public: 224 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 225 HandleMark* last_handle_mark() const { return _last_handle_mark; } 226 private: 227 228 // debug support for checking if code does allow safepoints or not 229 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on 230 // mutex, or blocking on an object synchronizer (Java locking). 231 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases 232 // If !allow_allocation(), then an assertion failure will happen during allocation 233 // (Hence, !allow_safepoint() => !allow_allocation()). 234 // 235 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. 236 // 237 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen 238 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. 239 240 // Used by SkipGCALot class. 241 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 242 243 // Record when GC is locked out via the GC_locker mechanism 244 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;) 245 246 friend class No_Alloc_Verifier; 247 friend class No_Safepoint_Verifier; 248 friend class Pause_No_Safepoint_Verifier; 249 friend class ThreadLocalStorage; 250 friend class GC_locker; 251 252 ThreadLocalAllocBuffer _tlab; // Thread-local eden 253 jlong _allocated_bytes; // Cumulative number of bytes allocated on 254 // the Java heap 255 256 TRACE_BUFFER _trace_buffer; // Thread-local buffer for tracing 257 258 int _vm_operation_started_count; // VM_Operation support 259 int _vm_operation_completed_count; // VM_Operation support 260 261 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread 262 // is waiting to lock 263 bool _current_pending_monitor_is_from_java; // locking is from Java code 264 265 // ObjectMonitor on which this thread called Object.wait() 266 ObjectMonitor* _current_waiting_monitor; 267 268 // Private thread-local objectmonitor list - a simple cache organized as a SLL. 269 public: 270 ObjectMonitor* omFreeList; 271 int omFreeCount; // length of omFreeList 272 int omFreeProvision; // reload chunk size 273 ObjectMonitor* omInUseList; // SLL to track monitors in circulation 274 int omInUseCount; // length of omInUseList 275 276#ifdef ASSERT 277 private: 278 bool _visited_for_critical_count; 279 280 public: 281 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } 282 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } 283#endif 284 285 public: 286 enum { 287 is_definitely_current_thread = true 288 }; 289 290 // Constructor 291 Thread(); 292 virtual ~Thread(); 293 294 // initializtion 295 void initialize_thread_local_storage(); 296 297 // thread entry point 298 virtual void run(); 299 300 // Testers 301 virtual bool is_VM_thread() const { return false; } 302 virtual bool is_Java_thread() const { return false; } 303 virtual bool is_Compiler_thread() const { return false; } 304 virtual bool is_hidden_from_external_view() const { return false; } 305 virtual bool is_jvmti_agent_thread() const { return false; } 306 // True iff the thread can perform GC operations at a safepoint. 307 // Generally will be true only of VM thread and parallel GC WorkGang 308 // threads. 309 virtual bool is_GC_task_thread() const { return false; } 310 virtual bool is_Watcher_thread() const { return false; } 311 virtual bool is_ConcurrentGC_thread() const { return false; } 312 virtual bool is_Named_thread() const { return false; } 313 virtual bool is_Worker_thread() const { return false; } 314 315 // Casts 316 virtual WorkerThread* as_Worker_thread() const { return NULL; } 317 318 virtual char* name() const { return (char*)"Unknown thread"; } 319 320 // Returns the current thread 321 static inline Thread* current(); 322 323 // Common thread operations 324 static void set_priority(Thread* thread, ThreadPriority priority); 325 static ThreadPriority get_priority(const Thread* const thread); 326 static void start(Thread* thread); 327 static void interrupt(Thread* thr); 328 static bool is_interrupted(Thread* thr, bool clear_interrupted); 329 330 void set_native_thread_name(const char *name) { 331 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); 332 os::set_native_thread_name(name); 333 } 334 335 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } 336 Monitor* SR_lock() const { return _SR_lock; } 337 338 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } 339 340 void set_suspend_flag(SuspendFlags f) { 341 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); 342 uint32_t flags; 343 do { 344 flags = _suspend_flags; 345 } 346 while (Atomic::cmpxchg((jint)(flags | f), 347 (volatile jint*)&_suspend_flags, 348 (jint)flags) != (jint)flags); 349 } 350 void clear_suspend_flag(SuspendFlags f) { 351 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); 352 uint32_t flags; 353 do { 354 flags = _suspend_flags; 355 } 356 while (Atomic::cmpxchg((jint)(flags & ~f), 357 (volatile jint*)&_suspend_flags, 358 (jint)flags) != (jint)flags); 359 } 360 361 void set_has_async_exception() { 362 set_suspend_flag(_has_async_exception); 363 } 364 void clear_has_async_exception() { 365 clear_suspend_flag(_has_async_exception); 366 } 367 368 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } 369 370 void set_critical_native_unlock() { 371 set_suspend_flag(_critical_native_unlock); 372 } 373 void clear_critical_native_unlock() { 374 clear_suspend_flag(_critical_native_unlock); 375 } 376 377 // Support for Unhandled Oop detection 378#ifdef CHECK_UNHANDLED_OOPS 379 private: 380 UnhandledOops* _unhandled_oops; 381 public: 382 UnhandledOops* unhandled_oops() { return _unhandled_oops; } 383 // Mark oop safe for gc. It may be stack allocated but won't move. 384 void allow_unhandled_oop(oop *op) { 385 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); 386 } 387 // Clear oops at safepoint so crashes point to unhandled oop violator 388 void clear_unhandled_oops() { 389 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); 390 } 391 bool is_gc_locked_out() { return _gc_locked_out_count > 0; } 392#endif // CHECK_UNHANDLED_OOPS 393 394#ifndef PRODUCT 395 bool skip_gcalot() { return _skip_gcalot; } 396 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 397#endif 398 399 public: 400 // Installs a pending exception to be inserted later 401 static void send_async_exception(oop thread_oop, oop java_throwable); 402 403 // Resource area 404 ResourceArea* resource_area() const { return _resource_area; } 405 void set_resource_area(ResourceArea* area) { _resource_area = area; } 406 407 OSThread* osthread() const { return _osthread; } 408 void set_osthread(OSThread* thread) { _osthread = thread; } 409 410 // JNI handle support 411 JNIHandleBlock* active_handles() const { return _active_handles; } 412 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 413 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 414 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 415 416 // Internal handle support 417 HandleArea* handle_area() const { return _handle_area; } 418 void set_handle_area(HandleArea* area) { _handle_area = area; } 419 420 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 421 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 422 423 // Thread-Local Allocation Buffer (TLAB) support 424 ThreadLocalAllocBuffer& tlab() { return _tlab; } 425 void initialize_tlab() { 426 if (UseTLAB) { 427 tlab().initialize(); 428 } 429 } 430 431 jlong allocated_bytes() { return _allocated_bytes; } 432 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 433 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 434 jlong cooked_allocated_bytes() { 435 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes); 436 if (UseTLAB) { 437 size_t used_bytes = tlab().used_bytes(); 438 if ((ssize_t)used_bytes > 0) { 439 // More-or-less valid tlab. The load_acquire above should ensure 440 // that the result of the add is <= the instantaneous value 441 return allocated_bytes + used_bytes; 442 } 443 } 444 return allocated_bytes; 445 } 446 447 TRACE_BUFFER trace_buffer() { return _trace_buffer; } 448 void set_trace_buffer(TRACE_BUFFER buf) { _trace_buffer = buf; } 449 450 // VM operation support 451 int vm_operation_ticket() { return ++_vm_operation_started_count; } 452 int vm_operation_completed_count() { return _vm_operation_completed_count; } 453 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } 454 455 // For tracking the heavyweight monitor the thread is pending on. 456 ObjectMonitor* current_pending_monitor() { 457 return _current_pending_monitor; 458 } 459 void set_current_pending_monitor(ObjectMonitor* monitor) { 460 _current_pending_monitor = monitor; 461 } 462 void set_current_pending_monitor_is_from_java(bool from_java) { 463 _current_pending_monitor_is_from_java = from_java; 464 } 465 bool current_pending_monitor_is_from_java() { 466 return _current_pending_monitor_is_from_java; 467 } 468 469 // For tracking the ObjectMonitor on which this thread called Object.wait() 470 ObjectMonitor* current_waiting_monitor() { 471 return _current_waiting_monitor; 472 } 473 void set_current_waiting_monitor(ObjectMonitor* monitor) { 474 _current_waiting_monitor = monitor; 475 } 476 477 // GC support 478 // Apply "f->do_oop" to all root oops in "this". 479 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 480 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf); 481 482 // Handles the parallel case for the method below. 483private: 484 bool claim_oops_do_par_case(int collection_parity); 485public: 486 // Requires that "collection_parity" is that of the current strong roots 487 // iteration. If "is_par" is false, sets the parity of "this" to 488 // "collection_parity", and returns "true". If "is_par" is true, 489 // uses an atomic instruction to set the current threads parity to 490 // "collection_parity", if it is not already. Returns "true" iff the 491 // calling thread does the update, this indicates that the calling thread 492 // has claimed the thread's stack as a root groop in the current 493 // collection. 494 bool claim_oops_do(bool is_par, int collection_parity) { 495 if (!is_par) { 496 _oops_do_parity = collection_parity; 497 return true; 498 } else { 499 return claim_oops_do_par_case(collection_parity); 500 } 501 } 502 503 // Sweeper support 504 void nmethods_do(CodeBlobClosure* cf); 505 506 // jvmtiRedefineClasses support 507 void metadata_do(void f(Metadata*)); 508 509 // Used by fast lock support 510 virtual bool is_lock_owned(address adr) const; 511 512 // Check if address is in the stack of the thread (not just for locks). 513 // Warning: the method can only be used on the running thread 514 bool is_in_stack(address adr) const; 515 516 // Sets this thread as starting thread. Returns failure if thread 517 // creation fails due to lack of memory, too many threads etc. 518 bool set_as_starting_thread(); 519 520 protected: 521 // OS data associated with the thread 522 OSThread* _osthread; // Platform-specific thread information 523 524 // Thread local resource area for temporary allocation within the VM 525 ResourceArea* _resource_area; 526 527 // Thread local handle area for allocation of handles within the VM 528 HandleArea* _handle_area; 529 GrowableArray<Metadata*>* _metadata_handles; 530 531 // Support for stack overflow handling, get_thread, etc. 532 address _stack_base; 533 size_t _stack_size; 534 uintptr_t _self_raw_id; // used by get_thread (mutable) 535 int _lgrp_id; 536 537 public: 538 // Stack overflow support 539 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 540 541 void set_stack_base(address base) { _stack_base = base; } 542 size_t stack_size() const { return _stack_size; } 543 void set_stack_size(size_t size) { _stack_size = size; } 544 void record_stack_base_and_size(); 545 546 bool on_local_stack(address adr) const { 547 /* QQQ this has knowledge of direction, ought to be a stack method */ 548 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); 549 } 550 551 uintptr_t self_raw_id() { return _self_raw_id; } 552 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } 553 554 int lgrp_id() const { return _lgrp_id; } 555 void set_lgrp_id(int value) { _lgrp_id = value; } 556 557 // Printing 558 void print_on(outputStream* st) const; 559 void print() const { print_on(tty); } 560 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 561 562 // Debug-only code 563#ifdef ASSERT 564 private: 565 // Deadlock detection support for Mutex locks. List of locks own by thread. 566 Monitor* _owned_locks; 567 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 568 // thus the friendship 569 friend class Mutex; 570 friend class Monitor; 571 572 public: 573 void print_owned_locks_on(outputStream* st) const; 574 void print_owned_locks() const { print_owned_locks_on(tty); } 575 Monitor* owned_locks() const { return _owned_locks; } 576 bool owns_locks() const { return owned_locks() != NULL; } 577 bool owns_locks_but_compiled_lock() const; 578 579 // Deadlock detection 580 bool allow_allocation() { return _allow_allocation_count == 0; } 581#endif 582 583 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; 584 585 private: 586 volatile int _jvmti_env_iteration_count; 587 588 public: 589 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 590 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 591 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 592 593 // Code generation 594 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } 595 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } 596 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } 597 598 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } 599 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } 600 601#define TLAB_FIELD_OFFSET(name) \ 602 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } 603 604 TLAB_FIELD_OFFSET(start) 605 TLAB_FIELD_OFFSET(end) 606 TLAB_FIELD_OFFSET(top) 607 TLAB_FIELD_OFFSET(pf_top) 608 TLAB_FIELD_OFFSET(size) // desired_size 609 TLAB_FIELD_OFFSET(refill_waste_limit) 610 TLAB_FIELD_OFFSET(number_of_refills) 611 TLAB_FIELD_OFFSET(fast_refill_waste) 612 TLAB_FIELD_OFFSET(slow_allocations) 613 614#undef TLAB_FIELD_OFFSET 615 616 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); } 617 618 public: 619 volatile intptr_t _Stalled ; 620 volatile int _TypeTag ; 621 ParkEvent * _ParkEvent ; // for synchronized() 622 ParkEvent * _SleepEvent ; // for Thread.sleep 623 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor 624 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease 625 int NativeSyncRecursion ; // diagnostic 626 627 volatile int _OnTrap ; // Resume-at IP delta 628 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG 629 jint _hashStateX ; // thread-specific hashCode generator state 630 jint _hashStateY ; 631 jint _hashStateZ ; 632 void * _schedctl ; 633 634 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code 635 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); } 636 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); } 637 638 volatile jint rng [4] ; // RNG for spin loop 639 640 // Low-level leaf-lock primitives used to implement synchronization 641 // and native monitor-mutex infrastructure. 642 // Not for general synchronization use. 643 static void SpinAcquire (volatile int * Lock, const char * Name) ; 644 static void SpinRelease (volatile int * Lock) ; 645 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; 646 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; 647 static void muxRelease (volatile intptr_t * Lock) ; 648}; 649 650// Inline implementation of Thread::current() 651// Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of 652// startup. 653// ThreadLocalStorage::thread is warm -- it's called > 16K times in the same 654// period. This is inlined in thread_<os_family>.inline.hpp. 655 656inline Thread* Thread::current() { 657#ifdef ASSERT 658// This function is very high traffic. Define PARANOID to enable expensive 659// asserts. 660#ifdef PARANOID 661 // Signal handler should call ThreadLocalStorage::get_thread_slow() 662 Thread* t = ThreadLocalStorage::get_thread_slow(); 663 assert(t != NULL && !t->is_inside_signal_handler(), 664 "Don't use Thread::current() inside signal handler"); 665#endif 666#endif 667 Thread* thread = ThreadLocalStorage::thread(); 668 assert(thread != NULL, "just checking"); 669 return thread; 670} 671 672// Name support for threads. non-JavaThread subclasses with multiple 673// uniquely named instances should derive from this. 674class NamedThread: public Thread { 675 friend class VMStructs; 676 enum { 677 max_name_len = 64 678 }; 679 private: 680 char* _name; 681 // log JavaThread being processed by oops_do 682 JavaThread* _processed_thread; 683 684 public: 685 NamedThread(); 686 ~NamedThread(); 687 // May only be called once per thread. 688 void set_name(const char* format, ...); 689 virtual bool is_Named_thread() const { return true; } 690 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } 691 JavaThread *processed_thread() { return _processed_thread; } 692 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } 693}; 694 695// Worker threads are named and have an id of an assigned work. 696class WorkerThread: public NamedThread { 697private: 698 uint _id; 699public: 700 WorkerThread() : _id(0) { } 701 virtual bool is_Worker_thread() const { return true; } 702 703 virtual WorkerThread* as_Worker_thread() const { 704 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); 705 return (WorkerThread*) this; 706 } 707 708 void set_id(uint work_id) { _id = work_id; } 709 uint id() const { return _id; } 710}; 711 712// A single WatcherThread is used for simulating timer interrupts. 713class WatcherThread: public Thread { 714 friend class VMStructs; 715 public: 716 virtual void run(); 717 718 private: 719 static WatcherThread* _watcher_thread; 720 721 volatile static bool _should_terminate; // updated without holding lock 722 public: 723 enum SomeConstants { 724 delay_interval = 10 // interrupt delay in milliseconds 725 }; 726 727 // Constructor 728 WatcherThread(); 729 730 // Tester 731 bool is_Watcher_thread() const { return true; } 732 733 // Printing 734 char* name() const { return (char*)"VM Periodic Task Thread"; } 735 void print_on(outputStream* st) const; 736 void print() const { print_on(tty); } 737 738 // Returns the single instance of WatcherThread 739 static WatcherThread* watcher_thread() { return _watcher_thread; } 740 741 // Create and start the single instance of WatcherThread, or stop it on shutdown 742 static void start(); 743 static void stop(); 744}; 745 746 747class CompilerThread; 748 749typedef void (*ThreadFunction)(JavaThread*, TRAPS); 750 751class JavaThread: public Thread { 752 friend class VMStructs; 753 private: 754 JavaThread* _next; // The next thread in the Threads list 755 oop _threadObj; // The Java level thread object 756 757#ifdef ASSERT 758 private: 759 int _java_call_counter; 760 761 public: 762 int java_call_counter() { return _java_call_counter; } 763 void inc_java_call_counter() { _java_call_counter++; } 764 void dec_java_call_counter() { 765 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 766 _java_call_counter--; 767 } 768 private: // restore original namespace restriction 769#endif // ifdef ASSERT 770 771#ifndef PRODUCT 772 public: 773 enum { 774 jump_ring_buffer_size = 16 775 }; 776 private: // restore original namespace restriction 777#endif 778 779 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 780 781 ThreadFunction _entry_point; 782 783 JNIEnv _jni_environment; 784 785 // Deopt support 786 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 787 788 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we 789 // transition out of native 790 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized 791 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 792 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 793 // Because deoptimization is lazy we must save jvmti requests to set locals 794 // in compiled frames until we deoptimize and we have an interpreter frame. 795 // This holds the pointer to array (yeah like there might be more than one) of 796 // description of compiled vframes that have locals that need to be updated. 797 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; 798 799 // Handshake value for fixing 6243940. We need a place for the i2c 800 // adapter to store the callee Method*. This value is NEVER live 801 // across a gc point so it does NOT have to be gc'd 802 // The handshake is open ended since we can't be certain that it will 803 // be NULLed. This is because we rarely ever see the race and end up 804 // in handle_wrong_method which is the backend of the handshake. See 805 // code in i2c adapters and handle_wrong_method. 806 807 Method* _callee_target; 808 809 // Used to pass back results to the interpreter or generated code running Java code. 810 oop _vm_result; // oop result is GC-preserved 811 Metadata* _vm_result_2; // non-oop result 812 813 // See ReduceInitialCardMarks: this holds the precise space interval of 814 // the most recent slow path allocation for which compiled code has 815 // elided card-marks for performance along the fast-path. 816 MemRegion _deferred_card_mark; 817 818 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 819 // allocated during deoptimization 820 // and by JNI_MonitorEnter/Exit 821 822 // Async. requests support 823 enum AsyncRequests { 824 _no_async_condition = 0, 825 _async_exception, 826 _async_unsafe_access_error 827 }; 828 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request 829 oop _pending_async_exception; 830 831 // Safepoint support 832 public: // Expose _thread_state for SafeFetchInt() 833 volatile JavaThreadState _thread_state; 834 private: 835 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint 836 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 837 838 // JavaThread termination support 839 enum TerminatedTypes { 840 _not_terminated = 0xDEAD - 2, 841 _thread_exiting, // JavaThread::exit() has been called for this thread 842 _thread_terminated, // JavaThread is removed from thread list 843 _vm_exited // JavaThread is still executing native code, but VM is terminated 844 // only VM_Exit can set _vm_exited 845 }; 846 847 // In general a JavaThread's _terminated field transitions as follows: 848 // 849 // _not_terminated => _thread_exiting => _thread_terminated 850 // 851 // _vm_exited is a special value to cover the case of a JavaThread 852 // executing native code after the VM itself is terminated. 853 volatile TerminatedTypes _terminated; 854 // suspend/resume support 855 volatile bool _suspend_equivalent; // Suspend equivalent condition 856 jint _in_deopt_handler; // count of deoptimization 857 // handlers thread is in 858 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 859 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 860 // never locked) when throwing an exception. Used by interpreter only. 861 862 // JNI attach states: 863 enum JNIAttachStates { 864 _not_attaching_via_jni = 1, // thread is not attaching via JNI 865 _attaching_via_jni, // thread is attaching via JNI 866 _attached_via_jni // thread has attached via JNI 867 }; 868 869 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 870 // A native thread that is attaching via JNI starts with a value 871 // of _attaching_via_jni and transitions to _attached_via_jni. 872 volatile JNIAttachStates _jni_attach_state; 873 874 public: 875 // State of the stack guard pages for this thread. 876 enum StackGuardState { 877 stack_guard_unused, // not needed 878 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow 879 stack_guard_enabled // enabled 880 }; 881 882 private: 883 884 StackGuardState _stack_guard_state; 885 886 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 887 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 888 // code) 889 volatile oop _exception_oop; // Exception thrown in compiled code 890 volatile address _exception_pc; // PC where exception happened 891 volatile address _exception_handler_pc; // PC for handler of exception 892 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 893 894 // support for compilation 895 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible) 896 897 // support for JNI critical regions 898 jint _jni_active_critical; // count of entries into JNI critical region 899 900 // For deadlock detection. 901 int _depth_first_number; 902 903 // JVMTI PopFrame support 904 // This is set to popframe_pending to signal that top Java frame should be popped immediately 905 int _popframe_condition; 906 907#ifndef PRODUCT 908 int _jmp_ring_index; 909 struct { 910 // We use intptr_t instead of address so debugger doesn't try and display strings 911 intptr_t _target; 912 intptr_t _instruction; 913 const char* _file; 914 int _line; 915 } _jmp_ring[ jump_ring_buffer_size ]; 916#endif /* PRODUCT */ 917 918#ifndef SERIALGC 919 // Support for G1 barriers 920 921 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. 922 // Set of all such queues. 923 static SATBMarkQueueSet _satb_mark_queue_set; 924 925 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. 926 // Set of all such queues. 927 static DirtyCardQueueSet _dirty_card_queue_set; 928 929 void flush_barrier_queues(); 930#endif // !SERIALGC 931 932 friend class VMThread; 933 friend class ThreadWaitTransition; 934 friend class VM_Exit; 935 936 void initialize(); // Initialized the instance variables 937 938 public: 939 // Constructor 940 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads 941 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 942 ~JavaThread(); 943 944#ifdef ASSERT 945 // verify this JavaThread hasn't be published in the Threads::list yet 946 void verify_not_published(); 947#endif 948 949 //JNI functiontable getter/setter for JVMTI jni function table interception API. 950 void set_jni_functions(struct JNINativeInterface_* functionTable) { 951 _jni_environment.functions = functionTable; 952 } 953 struct JNINativeInterface_* get_jni_functions() { 954 return (struct JNINativeInterface_ *)_jni_environment.functions; 955 } 956 957 // This function is called at thread creation to allow 958 // platform specific thread variables to be initialized. 959 void cache_global_variables(); 960 961 // Executes Shutdown.shutdown() 962 void invoke_shutdown_hooks(); 963 964 // Cleanup on thread exit 965 enum ExitType { 966 normal_exit, 967 jni_detach 968 }; 969 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 970 971 void cleanup_failed_attach_current_thread(); 972 973 // Testers 974 virtual bool is_Java_thread() const { return true; } 975 976 // compilation 977 void set_is_compiling(bool f) { _is_compiling = f; } 978 bool is_compiling() const { return _is_compiling; } 979 980 // Thread chain operations 981 JavaThread* next() const { return _next; } 982 void set_next(JavaThread* p) { _next = p; } 983 984 // Thread oop. threadObj() can be NULL for initial JavaThread 985 // (or for threads attached via JNI) 986 oop threadObj() const { return _threadObj; } 987 void set_threadObj(oop p) { _threadObj = p; } 988 989 ThreadPriority java_priority() const; // Read from threadObj() 990 991 // Prepare thread and add to priority queue. If a priority is 992 // not specified, use the priority of the thread object. Threads_lock 993 // must be held while this function is called. 994 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 995 996 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 997 address saved_exception_pc() { return _saved_exception_pc; } 998 999 1000 ThreadFunction entry_point() const { return _entry_point; } 1001 1002 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1003 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); 1004 1005 // Last frame anchor routines 1006 1007 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1008 1009 // last_Java_sp 1010 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1011 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1012 1013 // last_Java_pc 1014 1015 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1016 1017 // Safepoint support 1018 JavaThreadState thread_state() const { return _thread_state; } 1019 void set_thread_state(JavaThreadState s) { _thread_state=s; } 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 // native memory tracking 1042 inline MemRecorder* get_recorder() const { return (MemRecorder*)_recorder; } 1043 inline void set_recorder(MemRecorder* rc) { _recorder = (volatile MemRecorder*)rc; } 1044 1045 private: 1046 // per-thread memory recorder 1047 volatile MemRecorder* _recorder; 1048 1049 // Suspend/resume support for JavaThread 1050 private: 1051 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } 1052 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } 1053 1054 public: 1055 void java_suspend(); 1056 void java_resume(); 1057 int java_suspend_self(); 1058 1059 void check_and_wait_while_suspended() { 1060 assert(JavaThread::current() == this, "sanity check"); 1061 1062 bool do_self_suspend; 1063 do { 1064 // were we externally suspended while we were waiting? 1065 do_self_suspend = handle_special_suspend_equivalent_condition(); 1066 if (do_self_suspend) { 1067 // don't surprise the thread that suspended us by returning 1068 java_suspend_self(); 1069 set_suspend_equivalent(); 1070 } 1071 } while (do_self_suspend); 1072 } 1073 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); 1074 // Check for async exception in addition to safepoint and suspend request. 1075 static void check_special_condition_for_native_trans(JavaThread *thread); 1076 1077 // Same as check_special_condition_for_native_trans but finishes the 1078 // transition into thread_in_Java mode so that it can potentially 1079 // block. 1080 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); 1081 1082 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); 1083 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { 1084 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1085 // Warning: is_ext_suspend_completed() may temporarily drop the 1086 // SR_lock to allow the thread to reach a stable thread state if 1087 // it is currently in a transient thread state. 1088 return is_ext_suspend_completed(false /*!called_by_wait */, 1089 SuspendRetryDelay, bits); 1090 } 1091 1092 // We cannot allow wait_for_ext_suspend_completion() to run forever or 1093 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally 1094 // passed as the count and delay parameters. Experiments with specific 1095 // calls to wait_for_ext_suspend_completion() can be done by passing 1096 // other values in the code. Experiments with all calls can be done 1097 // via the appropriate -XX options. 1098 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); 1099 1100 void set_external_suspend() { set_suspend_flag (_external_suspend); } 1101 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } 1102 1103 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } 1104 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } 1105 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } 1106 1107 bool is_external_suspend() const { 1108 return (_suspend_flags & _external_suspend) != 0; 1109 } 1110 // Whenever a thread transitions from native to vm/java it must suspend 1111 // if external|deopt suspend is present. 1112 bool is_suspend_after_native() const { 1113 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; 1114 } 1115 1116 // external suspend request is completed 1117 bool is_ext_suspended() const { 1118 return (_suspend_flags & _ext_suspended) != 0; 1119 } 1120 1121 bool is_external_suspend_with_lock() const { 1122 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1123 return is_external_suspend(); 1124 } 1125 1126 // Special method to handle a pending external suspend request 1127 // when a suspend equivalent condition lifts. 1128 bool handle_special_suspend_equivalent_condition() { 1129 assert(is_suspend_equivalent(), 1130 "should only be called in a suspend equivalence condition"); 1131 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1132 bool ret = is_external_suspend(); 1133 if (!ret) { 1134 // not about to self-suspend so clear suspend equivalence 1135 clear_suspend_equivalent(); 1136 } 1137 // implied else: 1138 // We have a pending external suspend request so we leave the 1139 // suspend_equivalent flag set until java_suspend_self() sets 1140 // the ext_suspended flag and clears the suspend_equivalent 1141 // flag. This insures that wait_for_ext_suspend_completion() 1142 // will return consistent values. 1143 return ret; 1144 } 1145 1146 // utility methods to see if we are doing some kind of suspension 1147 bool is_being_ext_suspended() const { 1148 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1149 return is_ext_suspended() || is_external_suspend(); 1150 } 1151 1152 bool is_suspend_equivalent() const { return _suspend_equivalent; } 1153 1154 void set_suspend_equivalent() { _suspend_equivalent = true; }; 1155 void clear_suspend_equivalent() { _suspend_equivalent = false; }; 1156 1157 // Thread.stop support 1158 void send_thread_stop(oop throwable); 1159 AsyncRequests clear_special_runtime_exit_condition() { 1160 AsyncRequests x = _special_runtime_exit_condition; 1161 _special_runtime_exit_condition = _no_async_condition; 1162 return x; 1163 } 1164 1165 // Are any async conditions present? 1166 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } 1167 1168 void check_and_handle_async_exceptions(bool check_unsafe_error = true); 1169 1170 // these next two are also used for self-suspension and async exception support 1171 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1172 1173 // Return true if JavaThread has an asynchronous condition or 1174 // if external suspension is requested. 1175 bool has_special_runtime_exit_condition() { 1176 // We call is_external_suspend() last since external suspend should 1177 // be less common. Because we don't use is_external_suspend_with_lock 1178 // it is possible that we won't see an asynchronous external suspend 1179 // request that has just gotten started, i.e., SR_lock grabbed but 1180 // _external_suspend field change either not made yet or not visible 1181 // yet. However, this is okay because the request is asynchronous and 1182 // we will see the new flag value the next time through. It's also 1183 // possible that the external suspend request is dropped after 1184 // we have checked is_external_suspend(), we will recheck its value 1185 // under SR_lock in java_suspend_self(). 1186 return (_special_runtime_exit_condition != _no_async_condition) || 1187 is_external_suspend() || is_deopt_suspend(); 1188 } 1189 1190 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } 1191 1192 void set_pending_async_exception(oop e) { 1193 _pending_async_exception = e; 1194 _special_runtime_exit_condition = _async_exception; 1195 set_has_async_exception(); 1196 } 1197 1198 // Fast-locking support 1199 bool is_lock_owned(address adr) const; 1200 1201 // Accessors for vframe array top 1202 // The linked list of vframe arrays are sorted on sp. This means when we 1203 // unpack the head must contain the vframe array to unpack. 1204 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1205 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1206 1207 // Side structure for defering update of java frame locals until deopt occurs 1208 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } 1209 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } 1210 1211 // These only really exist to make debugging deopt problems simpler 1212 1213 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1214 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1215 1216 // The special resourceMark used during deoptimization 1217 1218 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1219 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1220 1221 intptr_t* must_deopt_id() { return _must_deopt_id; } 1222 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } 1223 void clear_must_deopt_id() { _must_deopt_id = NULL; } 1224 1225 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } 1226 nmethod* deopt_nmethod() { return _deopt_nmethod; } 1227 1228 Method* callee_target() const { return _callee_target; } 1229 void set_callee_target (Method* x) { _callee_target = x; } 1230 1231 // Oop results of vm runtime calls 1232 oop vm_result() const { return _vm_result; } 1233 void set_vm_result (oop x) { _vm_result = x; } 1234 1235 Metadata* vm_result_2() const { return _vm_result_2; } 1236 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1237 1238 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1239 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1240 1241 // Exception handling for compiled methods 1242 oop exception_oop() const { return _exception_oop; } 1243 address exception_pc() const { return _exception_pc; } 1244 address exception_handler_pc() const { return _exception_handler_pc; } 1245 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1246 1247 void set_exception_oop(oop o) { _exception_oop = o; } 1248 void set_exception_pc(address a) { _exception_pc = a; } 1249 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1250 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1251 1252 // Stack overflow support 1253 inline size_t stack_available(address cur_sp); 1254 address stack_yellow_zone_base() 1255 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } 1256 size_t stack_yellow_zone_size() 1257 { return StackYellowPages * os::vm_page_size(); } 1258 address stack_red_zone_base() 1259 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } 1260 size_t stack_red_zone_size() 1261 { return StackRedPages * os::vm_page_size(); } 1262 bool in_stack_yellow_zone(address a) 1263 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } 1264 bool in_stack_red_zone(address a) 1265 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } 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_yellow_zone_disabled(); 1276 inline bool stack_yellow_zone_enabled(); 1277 1278 // Attempt to reguard the stack after a stack overflow may have occurred. 1279 // Returns true if (a) guard pages are not needed on this thread, (b) the 1280 // pages are already guarded, or (c) the pages were successfully reguarded. 1281 // Returns false if there is not enough stack space to reguard the pages, in 1282 // which case the caller should unwind a frame and try again. The argument 1283 // should be the caller's (approximate) sp. 1284 bool reguard_stack(address cur_sp); 1285 // Similar to above but see if current stackpoint is out of the guard area 1286 // and reguard if possible. 1287 bool reguard_stack(void); 1288 1289 // Misc. accessors/mutators 1290 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1291 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1292 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1293 1294#ifndef PRODUCT 1295 void record_jump(address target, address instr, const char* file, int line); 1296#endif /* PRODUCT */ 1297 1298 // For assembly stub generation 1299 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } 1300#ifndef PRODUCT 1301 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } 1302 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } 1303#endif /* PRODUCT */ 1304 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } 1305 static ByteSize last_Java_sp_offset() { 1306 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1307 } 1308 static ByteSize last_Java_pc_offset() { 1309 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1310 } 1311 static ByteSize frame_anchor_offset() { 1312 return byte_offset_of(JavaThread, _anchor); 1313 } 1314 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } 1315 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } 1316 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } 1317 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } 1318 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } 1319 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } 1320 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } 1321 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } 1322 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1323 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1324 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } 1325 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } 1326 1327 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1328 static ByteSize should_post_on_exceptions_flag_offset() { 1329 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1330 } 1331 1332#ifndef SERIALGC 1333 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } 1334 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } 1335#endif // !SERIALGC 1336 1337 // Returns the jni environment for this thread 1338 JNIEnv* jni_environment() { return &_jni_environment; } 1339 1340 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1341 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1342 // Only return NULL if thread is off the thread list; starting to 1343 // exit should not return NULL. 1344 if (thread_from_jni_env->is_terminated()) { 1345 thread_from_jni_env->block_if_vm_exited(); 1346 return NULL; 1347 } else { 1348 return thread_from_jni_env; 1349 } 1350 } 1351 1352 // JNI critical regions. These can nest. 1353 bool in_critical() { return _jni_active_critical > 0; } 1354 bool in_last_critical() { return _jni_active_critical == 1; } 1355 void enter_critical() { assert(Thread::current() == this || 1356 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(), 1357 "this must be current thread or synchronizing"); 1358 _jni_active_critical++; } 1359 void exit_critical() { assert(Thread::current() == this, 1360 "this must be current thread"); 1361 _jni_active_critical--; 1362 assert(_jni_active_critical >= 0, 1363 "JNI critical nesting problem?"); } 1364 1365 // For deadlock detection 1366 int depth_first_number() { return _depth_first_number; } 1367 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1368 1369 private: 1370 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1371 1372 public: 1373 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1374 void add_monitor_chunk(MonitorChunk* chunk); 1375 void remove_monitor_chunk(MonitorChunk* chunk); 1376 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1377 void inc_in_deopt_handler() { _in_deopt_handler++; } 1378 void dec_in_deopt_handler() { 1379 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1380 if (_in_deopt_handler > 0) { // robustness 1381 _in_deopt_handler--; 1382 } 1383 } 1384 1385 private: 1386 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1387 1388 public: 1389 1390 // Frame iteration; calls the function f for all frames on the stack 1391 void frames_do(void f(frame*, const RegisterMap*)); 1392 1393 // Memory operations 1394 void oops_do(OopClosure* f, CodeBlobClosure* cf); 1395 1396 // Sweeper operations 1397 void nmethods_do(CodeBlobClosure* cf); 1398 1399 // RedefineClasses Support 1400 void metadata_do(void f(Metadata*)); 1401 1402 // Memory management operations 1403 void gc_epilogue(); 1404 void gc_prologue(); 1405 1406 // Misc. operations 1407 char* name() const { return (char*)get_thread_name(); } 1408 void print_on(outputStream* st) const; 1409 void print() const { print_on(tty); } 1410 void print_value(); 1411 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; 1412 void print_thread_state() const PRODUCT_RETURN; 1413 void print_on_error(outputStream* st, char* buf, int buflen) const; 1414 void verify(); 1415 const char* get_thread_name() const; 1416private: 1417 // factor out low-level mechanics for use in both normal and error cases 1418 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1419public: 1420 const char* get_threadgroup_name() const; 1421 const char* get_parent_name() const; 1422 1423 // Accessing frames 1424 frame last_frame() { 1425 _anchor.make_walkable(this); 1426 return pd_last_frame(); 1427 } 1428 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1429 1430 // Returns method at 'depth' java or native frames down the stack 1431 // Used for security checks 1432 Klass* security_get_caller_class(int depth); 1433 1434 // Print stack trace in external format 1435 void print_stack_on(outputStream* st); 1436 void print_stack() { print_stack_on(tty); } 1437 1438 // Print stack traces in various internal formats 1439 void trace_stack() PRODUCT_RETURN; 1440 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1441 void trace_frames() PRODUCT_RETURN; 1442 void trace_oops() PRODUCT_RETURN; 1443 1444 // Print an annotated view of the stack frames 1445 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1446 void validate_frame_layout() { 1447 print_frame_layout(0, true); 1448 } 1449 1450 // Returns the number of stack frames on the stack 1451 int depth() const; 1452 1453 // Function for testing deoptimization 1454 void deoptimize(); 1455 void make_zombies(); 1456 1457 void deoptimized_wrt_marked_nmethods(); 1458 1459 // Profiling operation (see fprofile.cpp) 1460 public: 1461 bool profile_last_Java_frame(frame* fr); 1462 1463 private: 1464 ThreadProfiler* _thread_profiler; 1465 private: 1466 friend class FlatProfiler; // uses both [gs]et_thread_profiler. 1467 friend class FlatProfilerTask; // uses get_thread_profiler. 1468 friend class ThreadProfilerMark; // uses get_thread_profiler. 1469 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } 1470 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { 1471 ThreadProfiler* result = _thread_profiler; 1472 _thread_profiler = tp; 1473 return result; 1474 } 1475 1476 // NMT (Native memory tracking) support. 1477 // This flag helps NMT to determine if this JavaThread will be blocked 1478 // at safepoint. If not, ThreadCritical is needed for writing memory records. 1479 // JavaThread is only safepoint visible when it is in Threads' thread list, 1480 // it is not visible until it is added to the list and becomes invisible 1481 // once it is removed from the list. 1482 public: 1483 bool is_safepoint_visible() const { return _safepoint_visible; } 1484 void set_safepoint_visible(bool visible) { _safepoint_visible = visible; } 1485 private: 1486 bool _safepoint_visible; 1487 1488 // Static operations 1489 public: 1490 // Returns the running thread as a JavaThread 1491 static inline JavaThread* current(); 1492 1493 // Returns the active Java thread. Do not use this if you know you are calling 1494 // from a JavaThread, as it's slower than JavaThread::current. If called from 1495 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1496 // operation. You may not want that either. 1497 static JavaThread* active(); 1498 1499 inline CompilerThread* as_CompilerThread(); 1500 1501 public: 1502 virtual void run(); 1503 void thread_main_inner(); 1504 1505 private: 1506 // PRIVILEGED STACK 1507 PrivilegedElement* _privileged_stack_top; 1508 GrowableArray<oop>* _array_for_gc; 1509 public: 1510 1511 // Returns the privileged_stack information. 1512 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } 1513 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } 1514 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } 1515 1516 public: 1517 // Thread local information maintained by JVMTI. 1518 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1519 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1520 // getter is used to get this JavaThread's JvmtiThreadState if it has 1521 // one which means NULL can be returned. JvmtiThreadState::state_for() 1522 // is used to get the specified JavaThread's JvmtiThreadState if it has 1523 // one or it allocates a new JvmtiThreadState for the JavaThread and 1524 // returns it. JvmtiThreadState::state_for() will return NULL only if 1525 // the specified JavaThread is exiting. 1526 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1527 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1528 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } 1529 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } 1530 1531 // JVMTI PopFrame support 1532 // Setting and clearing popframe_condition 1533 // All of these enumerated values are bits. popframe_pending 1534 // indicates that a PopFrame() has been requested and not yet been 1535 // completed. popframe_processing indicates that that PopFrame() is in 1536 // the process of being completed. popframe_force_deopt_reexecution_bit 1537 // indicates that special handling is required when returning to a 1538 // deoptimized caller. 1539 enum PopCondition { 1540 popframe_inactive = 0x00, 1541 popframe_pending_bit = 0x01, 1542 popframe_processing_bit = 0x02, 1543 popframe_force_deopt_reexecution_bit = 0x04 1544 }; 1545 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1546 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1547 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1548 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1549 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1550 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1551 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1552 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1553#ifdef CC_INTERP 1554 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } 1555 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } 1556 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1557 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1558 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1559#endif 1560 1561 private: 1562 // Saved incoming arguments to popped frame. 1563 // Used only when popped interpreted frame returns to deoptimized frame. 1564 void* _popframe_preserved_args; 1565 int _popframe_preserved_args_size; 1566 1567 public: 1568 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1569 void* popframe_preserved_args(); 1570 ByteSize popframe_preserved_args_size(); 1571 WordSize popframe_preserved_args_size_in_words(); 1572 void popframe_free_preserved_args(); 1573 1574 1575 private: 1576 JvmtiThreadState *_jvmti_thread_state; 1577 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; 1578 1579 // Used by the interpreter in fullspeed mode for frame pop, method 1580 // entry, method exit and single stepping support. This field is 1581 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. 1582 // It can be set to zero asynchronously (i.e., without a VM operation 1583 // or a lock) so we have to be very careful. 1584 int _interp_only_mode; 1585 1586 public: 1587 // used by the interpreter for fullspeed debugging support (see above) 1588 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1589 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1590 int get_interp_only_mode() { return _interp_only_mode; } 1591 void increment_interp_only_mode() { ++_interp_only_mode; } 1592 void decrement_interp_only_mode() { --_interp_only_mode; } 1593 1594 // support for cached flag that indicates whether exceptions need to be posted for this thread 1595 // if this is false, we can avoid deoptimizing when events are thrown 1596 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1597 private: 1598 int _should_post_on_exceptions_flag; 1599 1600 public: 1601 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1602 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1603 1604 private: 1605 ThreadStatistics *_thread_stat; 1606 1607 public: 1608 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1609 1610 // Return a blocker object for which this thread is blocked parking. 1611 oop current_park_blocker(); 1612 1613 private: 1614 static size_t _stack_size_at_create; 1615 1616 public: 1617 static inline size_t stack_size_at_create(void) { 1618 return _stack_size_at_create; 1619 } 1620 static inline void set_stack_size_at_create(size_t value) { 1621 _stack_size_at_create = value; 1622 } 1623 1624#ifndef SERIALGC 1625 // SATB marking queue support 1626 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } 1627 static SATBMarkQueueSet& satb_mark_queue_set() { 1628 return _satb_mark_queue_set; 1629 } 1630 1631 // Dirty card queue support 1632 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } 1633 static DirtyCardQueueSet& dirty_card_queue_set() { 1634 return _dirty_card_queue_set; 1635 } 1636#endif // !SERIALGC 1637 1638 // This method initializes the SATB and dirty card queues before a 1639 // JavaThread is added to the Java thread list. Right now, we don't 1640 // have to do anything to the dirty card queue (it should have been 1641 // activated when the thread was created), but we have to activate 1642 // the SATB queue if the thread is created while a marking cycle is 1643 // in progress. The activation / de-activation of the SATB queues at 1644 // the beginning / end of a marking cycle is done during safepoints 1645 // so we have to make sure this method is called outside one to be 1646 // able to safely read the active field of the SATB queue set. Right 1647 // now, it is called just before the thread is added to the Java 1648 // thread list in the Threads::add() method. That method is holding 1649 // the Threads_lock which ensures we are outside a safepoint. We 1650 // cannot do the obvious and set the active field of the SATB queue 1651 // when the thread is created given that, in some cases, safepoints 1652 // might happen between the JavaThread constructor being called and the 1653 // thread being added to the Java thread list (an example of this is 1654 // when the structure for the DestroyJavaVM thread is created). 1655#ifndef SERIALGC 1656 void initialize_queues(); 1657#else // !SERIALGC 1658 void initialize_queues() { } 1659#endif // !SERIALGC 1660 1661 // Machine dependent stuff 1662#ifdef TARGET_OS_ARCH_linux_x86 1663# include "thread_linux_x86.hpp" 1664#endif 1665#ifdef TARGET_OS_ARCH_linux_sparc 1666# include "thread_linux_sparc.hpp" 1667#endif 1668#ifdef TARGET_OS_ARCH_linux_zero 1669# include "thread_linux_zero.hpp" 1670#endif 1671#ifdef TARGET_OS_ARCH_solaris_x86 1672# include "thread_solaris_x86.hpp" 1673#endif 1674#ifdef TARGET_OS_ARCH_solaris_sparc 1675# include "thread_solaris_sparc.hpp" 1676#endif 1677#ifdef TARGET_OS_ARCH_windows_x86 1678# include "thread_windows_x86.hpp" 1679#endif 1680#ifdef TARGET_OS_ARCH_linux_arm 1681# include "thread_linux_arm.hpp" 1682#endif 1683#ifdef TARGET_OS_ARCH_linux_ppc 1684# include "thread_linux_ppc.hpp" 1685#endif 1686#ifdef TARGET_OS_ARCH_bsd_x86 1687# include "thread_bsd_x86.hpp" 1688#endif 1689#ifdef TARGET_OS_ARCH_bsd_zero 1690# include "thread_bsd_zero.hpp" 1691#endif 1692 1693 1694 public: 1695 void set_blocked_on_compilation(bool value) { 1696 _blocked_on_compilation = value; 1697 } 1698 1699 bool blocked_on_compilation() { 1700 return _blocked_on_compilation; 1701 } 1702 protected: 1703 bool _blocked_on_compilation; 1704 1705 1706 // JSR166 per-thread parker 1707private: 1708 Parker* _parker; 1709public: 1710 Parker* parker() { return _parker; } 1711 1712 // Biased locking support 1713private: 1714 GrowableArray<MonitorInfo*>* _cached_monitor_info; 1715public: 1716 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 1717 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 1718 1719 // clearing/querying jni attach status 1720 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1721 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1722 void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; OrderAccess::fence(); } 1723private: 1724 // This field is used to determine if a thread has claimed 1725 // a par_id: it is -1 if the thread has not claimed a par_id; 1726 // otherwise its value is the par_id that has been claimed. 1727 int _claimed_par_id; 1728public: 1729 int get_claimed_par_id() { return _claimed_par_id; } 1730 void set_claimed_par_id(int id) { _claimed_par_id = id;} 1731}; 1732 1733// Inline implementation of JavaThread::current 1734inline JavaThread* JavaThread::current() { 1735 Thread* thread = ThreadLocalStorage::thread(); 1736 assert(thread != NULL && thread->is_Java_thread(), "just checking"); 1737 return (JavaThread*)thread; 1738} 1739 1740inline CompilerThread* JavaThread::as_CompilerThread() { 1741 assert(is_Compiler_thread(), "just checking"); 1742 return (CompilerThread*)this; 1743} 1744 1745inline bool JavaThread::stack_yellow_zone_disabled() { 1746 return _stack_guard_state == stack_guard_yellow_disabled; 1747} 1748 1749inline bool JavaThread::stack_yellow_zone_enabled() { 1750#ifdef ASSERT 1751 if (os::uses_stack_guard_pages()) { 1752 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); 1753 } 1754#endif 1755 return _stack_guard_state == stack_guard_enabled; 1756} 1757 1758inline size_t JavaThread::stack_available(address cur_sp) { 1759 // This code assumes java stacks grow down 1760 address low_addr; // Limit on the address for deepest stack depth 1761 if ( _stack_guard_state == stack_guard_unused) { 1762 low_addr = stack_base() - stack_size(); 1763 } else { 1764 low_addr = stack_yellow_zone_base(); 1765 } 1766 return cur_sp > low_addr ? cur_sp - low_addr : 0; 1767} 1768 1769// A thread used for Compilation. 1770class CompilerThread : public JavaThread { 1771 friend class VMStructs; 1772 private: 1773 CompilerCounters* _counters; 1774 1775 ciEnv* _env; 1776 CompileLog* _log; 1777 CompileTask* _task; 1778 CompileQueue* _queue; 1779 BufferBlob* _buffer_blob; 1780 1781 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper 1782 1783 public: 1784 1785 static CompilerThread* current(); 1786 1787 CompilerThread(CompileQueue* queue, CompilerCounters* counters); 1788 1789 bool is_Compiler_thread() const { return true; } 1790 // Hide this compiler thread from external view. 1791 bool is_hidden_from_external_view() const { return true; } 1792 1793 CompileQueue* queue() { return _queue; } 1794 CompilerCounters* counters() { return _counters; } 1795 1796 // Get/set the thread's compilation environment. 1797 ciEnv* env() { return _env; } 1798 void set_env(ciEnv* env) { _env = env; } 1799 1800 BufferBlob* get_buffer_blob() { return _buffer_blob; } 1801 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }; 1802 1803 // Get/set the thread's logging information 1804 CompileLog* log() { return _log; } 1805 void init_log(CompileLog* log) { 1806 // Set once, for good. 1807 assert(_log == NULL, "set only once"); 1808 _log = log; 1809 } 1810 1811 // GC support 1812 // Apply "f->do_oop" to all root oops in "this". 1813 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 1814 void oops_do(OopClosure* f, CodeBlobClosure* cf); 1815 1816#ifndef PRODUCT 1817private: 1818 IdealGraphPrinter *_ideal_graph_printer; 1819public: 1820 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } 1821 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } 1822#endif 1823 1824 // Get/set the thread's current task 1825 CompileTask* task() { return _task; } 1826 void set_task(CompileTask* task) { _task = task; } 1827 1828 // Track the nmethod currently being scanned by the sweeper 1829 void set_scanned_nmethod(nmethod* nm) { 1830 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value"); 1831 _scanned_nmethod = nm; 1832 } 1833}; 1834 1835inline CompilerThread* CompilerThread::current() { 1836 return JavaThread::current()->as_CompilerThread(); 1837} 1838 1839 1840// The active thread queue. It also keeps track of the current used 1841// thread priorities. 1842class Threads: AllStatic { 1843 friend class VMStructs; 1844 private: 1845 static JavaThread* _thread_list; 1846 static int _number_of_threads; 1847 static int _number_of_non_daemon_threads; 1848 static int _return_code; 1849#ifdef ASSERT 1850 static bool _vm_complete; 1851#endif 1852 1853 public: 1854 // Thread management 1855 // force_daemon is a concession to JNI, where we may need to add a 1856 // thread to the thread list before allocating its thread object 1857 static void add(JavaThread* p, bool force_daemon = false); 1858 static void remove(JavaThread* p); 1859 static bool includes(JavaThread* p); 1860 static JavaThread* first() { return _thread_list; } 1861 static void threads_do(ThreadClosure* tc); 1862 1863 // Initializes the vm and creates the vm thread 1864 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 1865 static void convert_vm_init_libraries_to_agents(); 1866 static void create_vm_init_libraries(); 1867 static void create_vm_init_agents(); 1868 static void shutdown_vm_agents(); 1869 static bool destroy_vm(); 1870 // Supported VM versions via JNI 1871 // Includes JNI_VERSION_1_1 1872 static jboolean is_supported_jni_version_including_1_1(jint version); 1873 // Does not include JNI_VERSION_1_1 1874 static jboolean is_supported_jni_version(jint version); 1875 1876 // Garbage collection 1877 static void follow_other_roots(void f(oop*)); 1878 1879 // Apply "f->do_oop" to all root oops in all threads. 1880 // This version may only be called by sequential code. 1881 static void oops_do(OopClosure* f, CodeBlobClosure* cf); 1882 // This version may be called by sequential or parallel code. 1883 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf); 1884 // This creates a list of GCTasks, one per thread. 1885 static void create_thread_roots_tasks(GCTaskQueue* q); 1886 // This creates a list of GCTasks, one per thread, for marking objects. 1887 static void create_thread_roots_marking_tasks(GCTaskQueue* q); 1888 1889 // Apply "f->do_oop" to roots in all threads that 1890 // are part of compiled frames 1891 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); 1892 1893 static void convert_hcode_pointers(); 1894 static void restore_hcode_pointers(); 1895 1896 // Sweeper 1897 static void nmethods_do(CodeBlobClosure* cf); 1898 1899 // RedefineClasses support 1900 static void metadata_do(void f(Metadata*)); 1901 1902 static void gc_epilogue(); 1903 static void gc_prologue(); 1904#ifdef ASSERT 1905 static bool is_vm_complete() { return _vm_complete; } 1906#endif 1907 1908 // Verification 1909 static void verify(); 1910 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); 1911 static void print(bool print_stacks, bool internal_format) { 1912 // this function is only used by debug.cpp 1913 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); 1914 } 1915 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 1916 1917 // Get Java threads that are waiting to enter a monitor. If doLock 1918 // is true, then Threads_lock is grabbed as needed. Otherwise, the 1919 // VM needs to be at a safepoint. 1920 static GrowableArray<JavaThread*>* get_pending_threads(int count, 1921 address monitor, bool doLock); 1922 1923 // Get owning Java thread from the monitor's owner field. If doLock 1924 // is true, then Threads_lock is grabbed as needed. Otherwise, the 1925 // VM needs to be at a safepoint. 1926 static JavaThread *owning_thread_from_monitor_owner(address owner, 1927 bool doLock); 1928 1929 // Number of threads on the active threads list 1930 static int number_of_threads() { return _number_of_threads; } 1931 // Number of non-daemon threads on the active threads list 1932 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 1933 1934 // Deoptimizes all frames tied to marked nmethods 1935 static void deoptimized_wrt_marked_nmethods(); 1936 1937}; 1938 1939 1940// Thread iterator 1941class ThreadClosure: public StackObj { 1942 public: 1943 virtual void do_thread(Thread* thread) = 0; 1944}; 1945 1946class SignalHandlerMark: public StackObj { 1947private: 1948 Thread* _thread; 1949public: 1950 SignalHandlerMark(Thread* t) { 1951 _thread = t; 1952 if (_thread) _thread->enter_signal_handler(); 1953 } 1954 ~SignalHandlerMark() { 1955 if (_thread) _thread->leave_signal_handler(); 1956 _thread = NULL; 1957 } 1958}; 1959 1960 1961#endif // SHARE_VM_RUNTIME_THREAD_HPP 1962