thread.hpp revision 7051:0420e825bb3c
1/* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_THREAD_HPP 26#define SHARE_VM_RUNTIME_THREAD_HPP 27 28#include "memory/allocation.hpp" 29#include "memory/threadLocalAllocBuffer.hpp" 30#include "oops/oop.hpp" 31#include "prims/jni.h" 32#include "prims/jvmtiExport.hpp" 33#include "runtime/frame.hpp" 34#include "runtime/javaFrameAnchor.hpp" 35#include "runtime/jniHandles.hpp" 36#include "runtime/mutexLocker.hpp" 37#include "runtime/os.hpp" 38#include "runtime/osThread.hpp" 39#include "runtime/park.hpp" 40#include "runtime/safepoint.hpp" 41#include "runtime/stubRoutines.hpp" 42#include "runtime/threadLocalStorage.hpp" 43#include "runtime/unhandledOops.hpp" 44#include "utilities/macros.hpp" 45 46#include "trace/traceBackend.hpp" 47#include "trace/traceMacros.hpp" 48#include "utilities/exceptions.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 60class ThreadSafepointState; 61class ThreadProfiler; 62 63class JvmtiThreadState; 64class JvmtiGetLoadedClassesClosure; 65class ThreadStatistics; 66class ConcurrentLocksDump; 67class ParkEvent; 68class Parker; 69 70class ciEnv; 71class CompileThread; 72class CompileLog; 73class CompileTask; 74class CompileQueue; 75class CompilerCounters; 76class vframeArray; 77 78class DeoptResourceMark; 79class jvmtiDeferredLocalVariableSet; 80 81class GCTaskQueue; 82class ThreadClosure; 83class IdealGraphPrinter; 84 85DEBUG_ONLY(class ResourceMark;) 86 87class WorkerThread; 88 89// Class hierarchy 90// - Thread 91// - NamedThread 92// - VMThread 93// - ConcurrentGCThread 94// - WorkerThread 95// - GangWorker 96// - GCTaskThread 97// - JavaThread 98// - WatcherThread 99 100class Thread: public ThreadShadow { 101 friend class VMStructs; 102 private: 103 // Exception handling 104 // (Note: _pending_exception and friends are in ThreadShadow) 105 //oop _pending_exception; // pending exception for current thread 106 // const char* _exception_file; // file information for exception (debugging only) 107 // int _exception_line; // line information for exception (debugging only) 108 protected: 109 // Support for forcing alignment of thread objects for biased locking 110 void* _real_malloc_address; 111 public: 112 void* operator new(size_t size) throw() { return allocate(size, true); } 113 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 114 return allocate(size, false); } 115 void operator delete(void* p); 116 117 protected: 118 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 119 private: 120 121 // *************************************************************** 122 // Suspend and resume support 123 // *************************************************************** 124 // 125 // VM suspend/resume no longer exists - it was once used for various 126 // things including safepoints but was deprecated and finally removed 127 // in Java 7. Because VM suspension was considered "internal" Java-level 128 // suspension was considered "external", and this legacy naming scheme 129 // remains. 130 // 131 // External suspend/resume requests come from JVM_SuspendThread, 132 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI 133 // ResumeThread. External 134 // suspend requests cause _external_suspend to be set and external 135 // resume requests cause _external_suspend to be cleared. 136 // External suspend requests do not nest on top of other external 137 // suspend requests. The higher level APIs reject suspend requests 138 // for already suspended threads. 139 // 140 // The external_suspend 141 // flag is checked by has_special_runtime_exit_condition() and java thread 142 // will self-suspend when handle_special_runtime_exit_condition() is 143 // called. Most uses of the _thread_blocked state in JavaThreads are 144 // considered the same as being externally suspended; if the blocking 145 // condition lifts, the JavaThread will self-suspend. Other places 146 // where VM checks for external_suspend include: 147 // + mutex granting (do not enter monitors when thread is suspended) 148 // + state transitions from _thread_in_native 149 // 150 // In general, java_suspend() does not wait for an external suspend 151 // request to complete. When it returns, the only guarantee is that 152 // the _external_suspend field is true. 153 // 154 // wait_for_ext_suspend_completion() is used to wait for an external 155 // suspend request to complete. External suspend requests are usually 156 // followed by some other interface call that requires the thread to 157 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into 158 // the interface that requires quiescence, we give the JavaThread a 159 // chance to self-suspend before we need it to be quiescent. This 160 // improves overall suspend/query performance. 161 // 162 // _suspend_flags controls the behavior of java_ suspend/resume. 163 // It must be set under the protection of SR_lock. Read from the flag is 164 // OK without SR_lock as long as the value is only used as a hint. 165 // (e.g., check _external_suspend first without lock and then recheck 166 // inside SR_lock and finish the suspension) 167 // 168 // _suspend_flags is also overloaded for other "special conditions" so 169 // that a single check indicates whether any special action is needed 170 // eg. for async exceptions. 171 // ------------------------------------------------------------------- 172 // Notes: 173 // 1. The suspend/resume logic no longer uses ThreadState in OSThread 174 // but we still update its value to keep other part of the system (mainly 175 // JVMTI) happy. ThreadState is legacy code (see notes in 176 // osThread.hpp). 177 // 178 // 2. It would be more natural if set_external_suspend() is private and 179 // part of java_suspend(), but that probably would affect the suspend/query 180 // performance. Need more investigation on this. 181 182 // suspend/resume lock: used for self-suspend 183 Monitor* _SR_lock; 184 185 protected: 186 enum SuspendFlags { 187 // NOTE: avoid using the sign-bit as cc generates different test code 188 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 189 190 _external_suspend = 0x20000000U, // thread is asked to self suspend 191 _ext_suspended = 0x40000000U, // thread has self-suspended 192 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt 193 194 _has_async_exception = 0x00000001U, // there is a pending async exception 195 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock 196 }; 197 198 // various suspension related flags - atomically updated 199 // overloaded for async exception checking in check_special_condition_for_native_trans. 200 volatile uint32_t _suspend_flags; 201 202 private: 203 int _num_nested_signal; 204 205 public: 206 void enter_signal_handler() { _num_nested_signal++; } 207 void leave_signal_handler() { _num_nested_signal--; } 208 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } 209 210 private: 211 // Debug tracing 212 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; 213 214 // Active_handles points to a block of handles 215 JNIHandleBlock* _active_handles; 216 217 // One-element thread local free list 218 JNIHandleBlock* _free_handle_block; 219 220 // Point to the last handle mark 221 HandleMark* _last_handle_mark; 222 223 // The parity of the last strong_roots iteration in which this thread was 224 // claimed as a task. 225 jint _oops_do_parity; 226 227 public: 228 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 229 HandleMark* last_handle_mark() const { return _last_handle_mark; } 230 private: 231 232 // debug support for checking if code does allow safepoints or not 233 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on 234 // mutex, or blocking on an object synchronizer (Java locking). 235 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases 236 // If !allow_allocation(), then an assertion failure will happen during allocation 237 // (Hence, !allow_safepoint() => !allow_allocation()). 238 // 239 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. 240 // 241 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen 242 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. 243 244 // Used by SkipGCALot class. 245 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 246 247 friend class No_Alloc_Verifier; 248 friend class No_Safepoint_Verifier; 249 friend class Pause_No_Safepoint_Verifier; 250 friend class ThreadLocalStorage; 251 friend class GC_locker; 252 253 ThreadLocalAllocBuffer _tlab; // Thread-local eden 254 jlong _allocated_bytes; // Cumulative number of bytes allocated on 255 // the Java heap 256 257 TRACE_DATA _trace_data; // Thread-local data for tracing 258 259 int _vm_operation_started_count; // VM_Operation support 260 int _vm_operation_completed_count; // VM_Operation support 261 262 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread 263 // is waiting to lock 264 bool _current_pending_monitor_is_from_java; // locking is from Java code 265 266 // ObjectMonitor on which this thread called Object.wait() 267 ObjectMonitor* _current_waiting_monitor; 268 269 // Private thread-local objectmonitor list - a simple cache organized as a SLL. 270 public: 271 ObjectMonitor* omFreeList; 272 int omFreeCount; // length of omFreeList 273 int omFreeProvision; // reload chunk size 274 ObjectMonitor* omInUseList; // SLL to track monitors in circulation 275 int omInUseCount; // length of omInUseList 276 277#ifdef ASSERT 278 private: 279 bool _visited_for_critical_count; 280 281 public: 282 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } 283 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } 284#endif 285 286 public: 287 enum { 288 is_definitely_current_thread = true 289 }; 290 291 // Constructor 292 Thread(); 293 virtual ~Thread(); 294 295 // initializtion 296 void initialize_thread_local_storage(); 297 298 // thread entry point 299 virtual void run(); 300 301 // Testers 302 virtual bool is_VM_thread() const { return false; } 303 virtual bool is_Java_thread() const { return false; } 304 virtual bool is_Compiler_thread() const { return false; } 305 virtual bool is_hidden_from_external_view() const { return false; } 306 virtual bool is_jvmti_agent_thread() const { return false; } 307 // True iff the thread can perform GC operations at a safepoint. 308 // Generally will be true only of VM thread and parallel GC WorkGang 309 // threads. 310 virtual bool is_GC_task_thread() const { return false; } 311 virtual bool is_Watcher_thread() const { return false; } 312 virtual bool is_ConcurrentGC_thread() const { return false; } 313 virtual bool is_Named_thread() const { return false; } 314 virtual bool is_Worker_thread() const { return false; } 315 316 // Casts 317 virtual WorkerThread* as_Worker_thread() const { return NULL; } 318 319 virtual char* name() const { return (char*)"Unknown thread"; } 320 321 // Returns the current thread 322 static inline Thread* current(); 323 324 // Common thread operations 325 static void set_priority(Thread* thread, ThreadPriority priority); 326 static ThreadPriority get_priority(const Thread* const thread); 327 static void start(Thread* thread); 328 static void interrupt(Thread* thr); 329 static bool is_interrupted(Thread* thr, bool clear_interrupted); 330 331 void set_native_thread_name(const char *name) { 332 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); 333 os::set_native_thread_name(name); 334 } 335 336 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } 337 Monitor* SR_lock() const { return _SR_lock; } 338 339 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } 340 341 inline void set_suspend_flag(SuspendFlags f); 342 inline void clear_suspend_flag(SuspendFlags f); 343 344 inline void set_has_async_exception(); 345 inline void clear_has_async_exception(); 346 347 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } 348 349 inline void set_critical_native_unlock(); 350 inline void clear_critical_native_unlock(); 351 352 // Support for Unhandled Oop detection 353#ifdef CHECK_UNHANDLED_OOPS 354 private: 355 UnhandledOops* _unhandled_oops; 356 public: 357 UnhandledOops* unhandled_oops() { return _unhandled_oops; } 358 // Mark oop safe for gc. It may be stack allocated but won't move. 359 void allow_unhandled_oop(oop *op) { 360 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); 361 } 362 // Clear oops at safepoint so crashes point to unhandled oop violator 363 void clear_unhandled_oops() { 364 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); 365 } 366#endif // CHECK_UNHANDLED_OOPS 367 368#ifndef PRODUCT 369 bool skip_gcalot() { return _skip_gcalot; } 370 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 371#endif 372 373 public: 374 // Installs a pending exception to be inserted later 375 static void send_async_exception(oop thread_oop, oop java_throwable); 376 377 // Resource area 378 ResourceArea* resource_area() const { return _resource_area; } 379 void set_resource_area(ResourceArea* area) { _resource_area = area; } 380 381 OSThread* osthread() const { return _osthread; } 382 void set_osthread(OSThread* thread) { _osthread = thread; } 383 384 // JNI handle support 385 JNIHandleBlock* active_handles() const { return _active_handles; } 386 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 387 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 388 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 389 390 // Internal handle support 391 HandleArea* handle_area() const { return _handle_area; } 392 void set_handle_area(HandleArea* area) { _handle_area = area; } 393 394 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 395 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 396 397 // Thread-Local Allocation Buffer (TLAB) support 398 ThreadLocalAllocBuffer& tlab() { return _tlab; } 399 void initialize_tlab() { 400 if (UseTLAB) { 401 tlab().initialize(); 402 } 403 } 404 405 jlong allocated_bytes() { return _allocated_bytes; } 406 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 407 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 408 inline jlong cooked_allocated_bytes(); 409 410 TRACE_DATA* trace_data() { return &_trace_data; } 411 412 // VM operation support 413 int vm_operation_ticket() { return ++_vm_operation_started_count; } 414 int vm_operation_completed_count() { return _vm_operation_completed_count; } 415 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } 416 417 // For tracking the heavyweight monitor the thread is pending on. 418 ObjectMonitor* current_pending_monitor() { 419 return _current_pending_monitor; 420 } 421 void set_current_pending_monitor(ObjectMonitor* monitor) { 422 _current_pending_monitor = monitor; 423 } 424 void set_current_pending_monitor_is_from_java(bool from_java) { 425 _current_pending_monitor_is_from_java = from_java; 426 } 427 bool current_pending_monitor_is_from_java() { 428 return _current_pending_monitor_is_from_java; 429 } 430 431 // For tracking the ObjectMonitor on which this thread called Object.wait() 432 ObjectMonitor* current_waiting_monitor() { 433 return _current_waiting_monitor; 434 } 435 void set_current_waiting_monitor(ObjectMonitor* monitor) { 436 _current_waiting_monitor = monitor; 437 } 438 439 // GC support 440 // Apply "f->do_oop" to all root oops in "this". 441 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive. 442 // Used by JavaThread::oops_do. 443 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 444 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 445 446 // Handles the parallel case for the method below. 447 private: 448 bool claim_oops_do_par_case(int collection_parity); 449 public: 450 // Requires that "collection_parity" is that of the current roots 451 // iteration. If "is_par" is false, sets the parity of "this" to 452 // "collection_parity", and returns "true". If "is_par" is true, 453 // uses an atomic instruction to set the current threads parity to 454 // "collection_parity", if it is not already. Returns "true" iff the 455 // calling thread does the update, this indicates that the calling thread 456 // has claimed the thread's stack as a root groop in the current 457 // collection. 458 bool claim_oops_do(bool is_par, int collection_parity) { 459 if (!is_par) { 460 _oops_do_parity = collection_parity; 461 return true; 462 } else { 463 return claim_oops_do_par_case(collection_parity); 464 } 465 } 466 467 // Sweeper support 468 void nmethods_do(CodeBlobClosure* cf); 469 470 // jvmtiRedefineClasses support 471 void metadata_do(void f(Metadata*)); 472 473 // Used by fast lock support 474 virtual bool is_lock_owned(address adr) const; 475 476 // Check if address is in the stack of the thread (not just for locks). 477 // Warning: the method can only be used on the running thread 478 bool is_in_stack(address adr) const; 479 // Check if address is in the usable part of the stack (excludes protected 480 // guard pages) 481 bool is_in_usable_stack(address adr) const; 482 483 // Sets this thread as starting thread. Returns failure if thread 484 // creation fails due to lack of memory, too many threads etc. 485 bool set_as_starting_thread(); 486 487 protected: 488 // OS data associated with the thread 489 OSThread* _osthread; // Platform-specific thread information 490 491 // Thread local resource area for temporary allocation within the VM 492 ResourceArea* _resource_area; 493 494 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 495 496 // Thread local handle area for allocation of handles within the VM 497 HandleArea* _handle_area; 498 GrowableArray<Metadata*>* _metadata_handles; 499 500 // Support for stack overflow handling, get_thread, etc. 501 address _stack_base; 502 size_t _stack_size; 503 uintptr_t _self_raw_id; // used by get_thread (mutable) 504 int _lgrp_id; 505 506 public: 507 // Stack overflow support 508 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 509 510 void set_stack_base(address base) { _stack_base = base; } 511 size_t stack_size() const { return _stack_size; } 512 void set_stack_size(size_t size) { _stack_size = size; } 513 void record_stack_base_and_size(); 514 515 bool on_local_stack(address adr) const { 516 // QQQ this has knowledge of direction, ought to be a stack method 517 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); 518 } 519 520 uintptr_t self_raw_id() { return _self_raw_id; } 521 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } 522 523 int lgrp_id() const { return _lgrp_id; } 524 void set_lgrp_id(int value) { _lgrp_id = value; } 525 526 // Printing 527 virtual void print_on(outputStream* st) const; 528 void print() const { print_on(tty); } 529 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 530 531 // Debug-only code 532#ifdef ASSERT 533 private: 534 // Deadlock detection support for Mutex locks. List of locks own by thread. 535 Monitor* _owned_locks; 536 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 537 // thus the friendship 538 friend class Mutex; 539 friend class Monitor; 540 541 public: 542 void print_owned_locks_on(outputStream* st) const; 543 void print_owned_locks() const { print_owned_locks_on(tty); } 544 Monitor* owned_locks() const { return _owned_locks; } 545 bool owns_locks() const { return owned_locks() != NULL; } 546 bool owns_locks_but_compiled_lock() const; 547 548 // Deadlock detection 549 bool allow_allocation() { return _allow_allocation_count == 0; } 550 ResourceMark* current_resource_mark() { return _current_resource_mark; } 551 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 552#endif 553 554 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; 555 556 private: 557 volatile int _jvmti_env_iteration_count; 558 559 public: 560 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 561 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 562 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 563 564 // Code generation 565 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); } 566 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); } 567 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); } 568 569 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); } 570 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); } 571 572#define TLAB_FIELD_OFFSET(name) \ 573 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } 574 575 TLAB_FIELD_OFFSET(start) 576 TLAB_FIELD_OFFSET(end) 577 TLAB_FIELD_OFFSET(top) 578 TLAB_FIELD_OFFSET(pf_top) 579 TLAB_FIELD_OFFSET(size) // desired_size 580 TLAB_FIELD_OFFSET(refill_waste_limit) 581 TLAB_FIELD_OFFSET(number_of_refills) 582 TLAB_FIELD_OFFSET(fast_refill_waste) 583 TLAB_FIELD_OFFSET(slow_allocations) 584 585#undef TLAB_FIELD_OFFSET 586 587 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); } 588 589 public: 590 volatile intptr_t _Stalled; 591 volatile int _TypeTag; 592 ParkEvent * _ParkEvent; // for synchronized() 593 ParkEvent * _SleepEvent; // for Thread.sleep 594 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor 595 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease 596 int NativeSyncRecursion; // diagnostic 597 598 volatile int _OnTrap; // Resume-at IP delta 599 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG 600 jint _hashStateX; // thread-specific hashCode generator state 601 jint _hashStateY; 602 jint _hashStateZ; 603 void * _schedctl; 604 605 606 volatile jint rng[4]; // RNG for spin loop 607 608 // Low-level leaf-lock primitives used to implement synchronization 609 // and native monitor-mutex infrastructure. 610 // Not for general synchronization use. 611 static void SpinAcquire(volatile int * Lock, const char * Name); 612 static void SpinRelease(volatile int * Lock); 613 static void muxAcquire(volatile intptr_t * Lock, const char * Name); 614 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev); 615 static void muxRelease(volatile intptr_t * Lock); 616}; 617 618// Inline implementation of Thread::current() 619// Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of 620// startup. 621// ThreadLocalStorage::thread is warm -- it's called > 16K times in the same 622// period. This is inlined in thread_<os_family>.inline.hpp. 623 624inline Thread* Thread::current() { 625#ifdef ASSERT 626 // This function is very high traffic. Define PARANOID to enable expensive 627 // asserts. 628#ifdef PARANOID 629 // Signal handler should call ThreadLocalStorage::get_thread_slow() 630 Thread* t = ThreadLocalStorage::get_thread_slow(); 631 assert(t != NULL && !t->is_inside_signal_handler(), 632 "Don't use Thread::current() inside signal handler"); 633#endif 634#endif 635 Thread* thread = ThreadLocalStorage::thread(); 636 assert(thread != NULL, "just checking"); 637 return thread; 638} 639 640// Name support for threads. non-JavaThread subclasses with multiple 641// uniquely named instances should derive from this. 642class NamedThread: public Thread { 643 friend class VMStructs; 644 enum { 645 max_name_len = 64 646 }; 647 private: 648 char* _name; 649 // log JavaThread being processed by oops_do 650 JavaThread* _processed_thread; 651 652 public: 653 NamedThread(); 654 ~NamedThread(); 655 // May only be called once per thread. 656 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); 657 virtual bool is_Named_thread() const { return true; } 658 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } 659 JavaThread *processed_thread() { return _processed_thread; } 660 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } 661 virtual void print_on(outputStream* st) const; 662}; 663 664// Worker threads are named and have an id of an assigned work. 665class WorkerThread: public NamedThread { 666 private: 667 uint _id; 668 public: 669 WorkerThread() : _id(0) { } 670 virtual bool is_Worker_thread() const { return true; } 671 672 virtual WorkerThread* as_Worker_thread() const { 673 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); 674 return (WorkerThread*) this; 675 } 676 677 void set_id(uint work_id) { _id = work_id; } 678 uint id() const { return _id; } 679}; 680 681// A single WatcherThread is used for simulating timer interrupts. 682class WatcherThread: public Thread { 683 friend class VMStructs; 684 public: 685 virtual void run(); 686 687 private: 688 static WatcherThread* _watcher_thread; 689 690 static bool _startable; 691 volatile static bool _should_terminate; // updated without holding lock 692 693 os::WatcherThreadCrashProtection* _crash_protection; 694 public: 695 enum SomeConstants { 696 delay_interval = 10 // interrupt delay in milliseconds 697 }; 698 699 // Constructor 700 WatcherThread(); 701 702 // Tester 703 bool is_Watcher_thread() const { return true; } 704 705 // Printing 706 char* name() const { return (char*)"VM Periodic Task Thread"; } 707 void print_on(outputStream* st) const; 708 void unpark(); 709 710 // Returns the single instance of WatcherThread 711 static WatcherThread* watcher_thread() { return _watcher_thread; } 712 713 // Create and start the single instance of WatcherThread, or stop it on shutdown 714 static void start(); 715 static void stop(); 716 // Only allow start once the VM is sufficiently initialized 717 // Otherwise the first task to enroll will trigger the start 718 static void make_startable(); 719 720 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) { 721 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread"); 722 _crash_protection = crash_protection; 723 } 724 725 bool has_crash_protection() const { return _crash_protection != NULL; } 726 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; } 727 728 private: 729 int sleep() const; 730}; 731 732 733class CompilerThread; 734 735typedef void (*ThreadFunction)(JavaThread*, TRAPS); 736 737class JavaThread: public Thread { 738 friend class VMStructs; 739 private: 740 JavaThread* _next; // The next thread in the Threads list 741 oop _threadObj; // The Java level thread object 742 743#ifdef ASSERT 744 private: 745 int _java_call_counter; 746 747 public: 748 int java_call_counter() { return _java_call_counter; } 749 void inc_java_call_counter() { _java_call_counter++; } 750 void dec_java_call_counter() { 751 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 752 _java_call_counter--; 753 } 754 private: // restore original namespace restriction 755#endif // ifdef ASSERT 756 757#ifndef PRODUCT 758 public: 759 enum { 760 jump_ring_buffer_size = 16 761 }; 762 private: // restore original namespace restriction 763#endif 764 765 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 766 767 ThreadFunction _entry_point; 768 769 JNIEnv _jni_environment; 770 771 // Deopt support 772 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 773 774 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we 775 // transition out of native 776 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized 777 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 778 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 779 // Because deoptimization is lazy we must save jvmti requests to set locals 780 // in compiled frames until we deoptimize and we have an interpreter frame. 781 // This holds the pointer to array (yeah like there might be more than one) of 782 // description of compiled vframes that have locals that need to be updated. 783 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; 784 785 // Handshake value for fixing 6243940. We need a place for the i2c 786 // adapter to store the callee Method*. This value is NEVER live 787 // across a gc point so it does NOT have to be gc'd 788 // The handshake is open ended since we can't be certain that it will 789 // be NULLed. This is because we rarely ever see the race and end up 790 // in handle_wrong_method which is the backend of the handshake. See 791 // code in i2c adapters and handle_wrong_method. 792 793 Method* _callee_target; 794 795 // Used to pass back results to the interpreter or generated code running Java code. 796 oop _vm_result; // oop result is GC-preserved 797 Metadata* _vm_result_2; // non-oop result 798 799 // See ReduceInitialCardMarks: this holds the precise space interval of 800 // the most recent slow path allocation for which compiled code has 801 // elided card-marks for performance along the fast-path. 802 MemRegion _deferred_card_mark; 803 804 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 805 // allocated during deoptimization 806 // and by JNI_MonitorEnter/Exit 807 808 // Async. requests support 809 enum AsyncRequests { 810 _no_async_condition = 0, 811 _async_exception, 812 _async_unsafe_access_error 813 }; 814 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request 815 oop _pending_async_exception; 816 817 // Safepoint support 818 public: // Expose _thread_state for SafeFetchInt() 819 volatile JavaThreadState _thread_state; 820 private: 821 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint 822 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 823 824 // JavaThread termination support 825 enum TerminatedTypes { 826 _not_terminated = 0xDEAD - 2, 827 _thread_exiting, // JavaThread::exit() has been called for this thread 828 _thread_terminated, // JavaThread is removed from thread list 829 _vm_exited // JavaThread is still executing native code, but VM is terminated 830 // only VM_Exit can set _vm_exited 831 }; 832 833 // In general a JavaThread's _terminated field transitions as follows: 834 // 835 // _not_terminated => _thread_exiting => _thread_terminated 836 // 837 // _vm_exited is a special value to cover the case of a JavaThread 838 // executing native code after the VM itself is terminated. 839 volatile TerminatedTypes _terminated; 840 // suspend/resume support 841 volatile bool _suspend_equivalent; // Suspend equivalent condition 842 jint _in_deopt_handler; // count of deoptimization 843 // handlers thread is in 844 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 845 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 846 // never locked) when throwing an exception. Used by interpreter only. 847 848 // JNI attach states: 849 enum JNIAttachStates { 850 _not_attaching_via_jni = 1, // thread is not attaching via JNI 851 _attaching_via_jni, // thread is attaching via JNI 852 _attached_via_jni // thread has attached via JNI 853 }; 854 855 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 856 // A native thread that is attaching via JNI starts with a value 857 // of _attaching_via_jni and transitions to _attached_via_jni. 858 volatile JNIAttachStates _jni_attach_state; 859 860 public: 861 // State of the stack guard pages for this thread. 862 enum StackGuardState { 863 stack_guard_unused, // not needed 864 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow 865 stack_guard_enabled // enabled 866 }; 867 868 private: 869 870 StackGuardState _stack_guard_state; 871 872 // Precompute the limit of the stack as used in stack overflow checks. 873 // We load it from here to simplify the stack overflow check in assembly. 874 address _stack_overflow_limit; 875 876 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 877 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 878 // code) 879 volatile oop _exception_oop; // Exception thrown in compiled code 880 volatile address _exception_pc; // PC where exception happened 881 volatile address _exception_handler_pc; // PC for handler of exception 882 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 883 884 // support for JNI critical regions 885 jint _jni_active_critical; // count of entries into JNI critical region 886 887 // Checked JNI: function name requires exception check 888 char* _pending_jni_exception_check_fn; 889 890 // For deadlock detection. 891 int _depth_first_number; 892 893 // JVMTI PopFrame support 894 // This is set to popframe_pending to signal that top Java frame should be popped immediately 895 int _popframe_condition; 896 897#ifndef PRODUCT 898 int _jmp_ring_index; 899 struct { 900 // We use intptr_t instead of address so debugger doesn't try and display strings 901 intptr_t _target; 902 intptr_t _instruction; 903 const char* _file; 904 int _line; 905 } _jmp_ring[jump_ring_buffer_size]; 906#endif // PRODUCT 907 908#if INCLUDE_ALL_GCS 909 // Support for G1 barriers 910 911 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. 912 // Set of all such queues. 913 static SATBMarkQueueSet _satb_mark_queue_set; 914 915 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. 916 // Set of all such queues. 917 static DirtyCardQueueSet _dirty_card_queue_set; 918 919 void flush_barrier_queues(); 920#endif // INCLUDE_ALL_GCS 921 922 friend class VMThread; 923 friend class ThreadWaitTransition; 924 friend class VM_Exit; 925 926 void initialize(); // Initialized the instance variables 927 928 public: 929 // Constructor 930 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads 931 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 932 ~JavaThread(); 933 934#ifdef ASSERT 935 // verify this JavaThread hasn't be published in the Threads::list yet 936 void verify_not_published(); 937#endif 938 939 //JNI functiontable getter/setter for JVMTI jni function table interception API. 940 void set_jni_functions(struct JNINativeInterface_* functionTable) { 941 _jni_environment.functions = functionTable; 942 } 943 struct JNINativeInterface_* get_jni_functions() { 944 return (struct JNINativeInterface_ *)_jni_environment.functions; 945 } 946 947 // This function is called at thread creation to allow 948 // platform specific thread variables to be initialized. 949 void cache_global_variables(); 950 951 // Executes Shutdown.shutdown() 952 void invoke_shutdown_hooks(); 953 954 // Cleanup on thread exit 955 enum ExitType { 956 normal_exit, 957 jni_detach 958 }; 959 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 960 961 void cleanup_failed_attach_current_thread(); 962 963 // Testers 964 virtual bool is_Java_thread() const { return true; } 965 966 // Thread chain operations 967 JavaThread* next() const { return _next; } 968 void set_next(JavaThread* p) { _next = p; } 969 970 // Thread oop. threadObj() can be NULL for initial JavaThread 971 // (or for threads attached via JNI) 972 oop threadObj() const { return _threadObj; } 973 void set_threadObj(oop p) { _threadObj = p; } 974 975 ThreadPriority java_priority() const; // Read from threadObj() 976 977 // Prepare thread and add to priority queue. If a priority is 978 // not specified, use the priority of the thread object. Threads_lock 979 // must be held while this function is called. 980 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 981 982 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 983 address saved_exception_pc() { return _saved_exception_pc; } 984 985 986 ThreadFunction entry_point() const { return _entry_point; } 987 988 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 989 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); 990 991 // Last frame anchor routines 992 993 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 994 995 // last_Java_sp 996 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 997 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 998 999 // last_Java_pc 1000 1001 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1002 1003 // Safepoint support 1004#ifndef PPC64 1005 JavaThreadState thread_state() const { return _thread_state; } 1006 void set_thread_state(JavaThreadState s) { _thread_state = s; } 1007#else 1008 // Use membars when accessing volatile _thread_state. See 1009 // Threads::create_vm() for size checks. 1010 inline JavaThreadState thread_state() const; 1011 inline void set_thread_state(JavaThreadState s); 1012#endif 1013 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } 1014 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } 1015 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } 1016 1017 // thread has called JavaThread::exit() or is terminated 1018 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } 1019 // thread is terminated (no longer on the threads list); we compare 1020 // against the two non-terminated values so that a freed JavaThread 1021 // will also be considered terminated. 1022 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } 1023 void set_terminated(TerminatedTypes t) { _terminated = t; } 1024 // special for Threads::remove() which is static: 1025 void set_terminated_value() { _terminated = _thread_terminated; } 1026 void block_if_vm_exited(); 1027 1028 bool doing_unsafe_access() { return _doing_unsafe_access; } 1029 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1030 1031 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1032 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1033 1034 // Suspend/resume support for JavaThread 1035 private: 1036 inline void set_ext_suspended(); 1037 inline void clear_ext_suspended(); 1038 1039 public: 1040 void java_suspend(); 1041 void java_resume(); 1042 int java_suspend_self(); 1043 1044 void check_and_wait_while_suspended() { 1045 assert(JavaThread::current() == this, "sanity check"); 1046 1047 bool do_self_suspend; 1048 do { 1049 // were we externally suspended while we were waiting? 1050 do_self_suspend = handle_special_suspend_equivalent_condition(); 1051 if (do_self_suspend) { 1052 // don't surprise the thread that suspended us by returning 1053 java_suspend_self(); 1054 set_suspend_equivalent(); 1055 } 1056 } while (do_self_suspend); 1057 } 1058 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); 1059 // Check for async exception in addition to safepoint and suspend request. 1060 static void check_special_condition_for_native_trans(JavaThread *thread); 1061 1062 // Same as check_special_condition_for_native_trans but finishes the 1063 // transition into thread_in_Java mode so that it can potentially 1064 // block. 1065 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); 1066 1067 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); 1068 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { 1069 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1070 // Warning: is_ext_suspend_completed() may temporarily drop the 1071 // SR_lock to allow the thread to reach a stable thread state if 1072 // it is currently in a transient thread state. 1073 return is_ext_suspend_completed(false /* !called_by_wait */, 1074 SuspendRetryDelay, bits); 1075 } 1076 1077 // We cannot allow wait_for_ext_suspend_completion() to run forever or 1078 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally 1079 // passed as the count and delay parameters. Experiments with specific 1080 // calls to wait_for_ext_suspend_completion() can be done by passing 1081 // other values in the code. Experiments with all calls can be done 1082 // via the appropriate -XX options. 1083 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); 1084 1085 inline void set_external_suspend(); 1086 inline void clear_external_suspend(); 1087 1088 inline void set_deopt_suspend(); 1089 inline void clear_deopt_suspend(); 1090 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } 1091 1092 bool is_external_suspend() const { 1093 return (_suspend_flags & _external_suspend) != 0; 1094 } 1095 // Whenever a thread transitions from native to vm/java it must suspend 1096 // if external|deopt suspend is present. 1097 bool is_suspend_after_native() const { 1098 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0; 1099 } 1100 1101 // external suspend request is completed 1102 bool is_ext_suspended() const { 1103 return (_suspend_flags & _ext_suspended) != 0; 1104 } 1105 1106 bool is_external_suspend_with_lock() const { 1107 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1108 return is_external_suspend(); 1109 } 1110 1111 // Special method to handle a pending external suspend request 1112 // when a suspend equivalent condition lifts. 1113 bool handle_special_suspend_equivalent_condition() { 1114 assert(is_suspend_equivalent(), 1115 "should only be called in a suspend equivalence condition"); 1116 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1117 bool ret = is_external_suspend(); 1118 if (!ret) { 1119 // not about to self-suspend so clear suspend equivalence 1120 clear_suspend_equivalent(); 1121 } 1122 // implied else: 1123 // We have a pending external suspend request so we leave the 1124 // suspend_equivalent flag set until java_suspend_self() sets 1125 // the ext_suspended flag and clears the suspend_equivalent 1126 // flag. This insures that wait_for_ext_suspend_completion() 1127 // will return consistent values. 1128 return ret; 1129 } 1130 1131 // utility methods to see if we are doing some kind of suspension 1132 bool is_being_ext_suspended() const { 1133 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1134 return is_ext_suspended() || is_external_suspend(); 1135 } 1136 1137 bool is_suspend_equivalent() const { return _suspend_equivalent; } 1138 1139 void set_suspend_equivalent() { _suspend_equivalent = true; } 1140 void clear_suspend_equivalent() { _suspend_equivalent = false; } 1141 1142 // Thread.stop support 1143 void send_thread_stop(oop throwable); 1144 AsyncRequests clear_special_runtime_exit_condition() { 1145 AsyncRequests x = _special_runtime_exit_condition; 1146 _special_runtime_exit_condition = _no_async_condition; 1147 return x; 1148 } 1149 1150 // Are any async conditions present? 1151 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } 1152 1153 void check_and_handle_async_exceptions(bool check_unsafe_error = true); 1154 1155 // these next two are also used for self-suspension and async exception support 1156 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1157 1158 // Return true if JavaThread has an asynchronous condition or 1159 // if external suspension is requested. 1160 bool has_special_runtime_exit_condition() { 1161 // We call is_external_suspend() last since external suspend should 1162 // be less common. Because we don't use is_external_suspend_with_lock 1163 // it is possible that we won't see an asynchronous external suspend 1164 // request that has just gotten started, i.e., SR_lock grabbed but 1165 // _external_suspend field change either not made yet or not visible 1166 // yet. However, this is okay because the request is asynchronous and 1167 // we will see the new flag value the next time through. It's also 1168 // possible that the external suspend request is dropped after 1169 // we have checked is_external_suspend(), we will recheck its value 1170 // under SR_lock in java_suspend_self(). 1171 return (_special_runtime_exit_condition != _no_async_condition) || 1172 is_external_suspend() || is_deopt_suspend(); 1173 } 1174 1175 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } 1176 1177 inline void set_pending_async_exception(oop e); 1178 1179 // Fast-locking support 1180 bool is_lock_owned(address adr) const; 1181 1182 // Accessors for vframe array top 1183 // The linked list of vframe arrays are sorted on sp. This means when we 1184 // unpack the head must contain the vframe array to unpack. 1185 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1186 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1187 1188 // Side structure for deferring update of java frame locals until deopt occurs 1189 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } 1190 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } 1191 1192 // These only really exist to make debugging deopt problems simpler 1193 1194 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1195 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1196 1197 // The special resourceMark used during deoptimization 1198 1199 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1200 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1201 1202 intptr_t* must_deopt_id() { return _must_deopt_id; } 1203 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } 1204 void clear_must_deopt_id() { _must_deopt_id = NULL; } 1205 1206 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } 1207 nmethod* deopt_nmethod() { return _deopt_nmethod; } 1208 1209 Method* callee_target() const { return _callee_target; } 1210 void set_callee_target (Method* x) { _callee_target = x; } 1211 1212 // Oop results of vm runtime calls 1213 oop vm_result() const { return _vm_result; } 1214 void set_vm_result (oop x) { _vm_result = x; } 1215 1216 Metadata* vm_result_2() const { return _vm_result_2; } 1217 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1218 1219 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1220 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1221 1222 // Exception handling for compiled methods 1223 oop exception_oop() const { return _exception_oop; } 1224 address exception_pc() const { return _exception_pc; } 1225 address exception_handler_pc() const { return _exception_handler_pc; } 1226 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1227 1228 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); } 1229 void set_exception_pc(address a) { _exception_pc = a; } 1230 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1231 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1232 1233 void clear_exception_oop_and_pc() { 1234 set_exception_oop(NULL); 1235 set_exception_pc(NULL); 1236 } 1237 1238 // Stack overflow support 1239 inline size_t stack_available(address cur_sp); 1240 address stack_yellow_zone_base() { 1241 return (address)(stack_base() - 1242 (stack_size() - 1243 (stack_red_zone_size() + stack_yellow_zone_size()))); 1244 } 1245 size_t stack_yellow_zone_size() { 1246 return StackYellowPages * os::vm_page_size(); 1247 } 1248 address stack_red_zone_base() { 1249 return (address)(stack_base() - (stack_size() - stack_red_zone_size())); 1250 } 1251 size_t stack_red_zone_size() { return StackRedPages * os::vm_page_size(); } 1252 bool in_stack_yellow_zone(address a) { 1253 return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); 1254 } 1255 bool in_stack_red_zone(address a) { 1256 return (a <= stack_red_zone_base()) && 1257 (a >= (address)((intptr_t)stack_base() - stack_size())); 1258 } 1259 1260 void create_stack_guard_pages(); 1261 void remove_stack_guard_pages(); 1262 1263 void enable_stack_yellow_zone(); 1264 void disable_stack_yellow_zone(); 1265 void enable_stack_red_zone(); 1266 void disable_stack_red_zone(); 1267 1268 inline bool stack_guard_zone_unused(); 1269 inline bool stack_yellow_zone_disabled(); 1270 inline bool stack_yellow_zone_enabled(); 1271 1272 // Attempt to reguard the stack after a stack overflow may have occurred. 1273 // Returns true if (a) guard pages are not needed on this thread, (b) the 1274 // pages are already guarded, or (c) the pages were successfully reguarded. 1275 // Returns false if there is not enough stack space to reguard the pages, in 1276 // which case the caller should unwind a frame and try again. The argument 1277 // should be the caller's (approximate) sp. 1278 bool reguard_stack(address cur_sp); 1279 // Similar to above but see if current stackpoint is out of the guard area 1280 // and reguard if possible. 1281 bool reguard_stack(void); 1282 1283 address stack_overflow_limit() { return _stack_overflow_limit; } 1284 void set_stack_overflow_limit() { 1285 _stack_overflow_limit = _stack_base - _stack_size + 1286 ((StackShadowPages + 1287 StackYellowPages + 1288 StackRedPages) * os::vm_page_size()); 1289 } 1290 1291 // Misc. accessors/mutators 1292 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1293 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1294 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1295 1296#ifndef PRODUCT 1297 void record_jump(address target, address instr, const char* file, int line); 1298#endif // PRODUCT 1299 1300 // For assembly stub generation 1301 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } 1302#ifndef PRODUCT 1303 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); } 1304 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); } 1305#endif // PRODUCT 1306 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } 1307 static ByteSize last_Java_sp_offset() { 1308 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1309 } 1310 static ByteSize last_Java_pc_offset() { 1311 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1312 } 1313 static ByteSize frame_anchor_offset() { 1314 return byte_offset_of(JavaThread, _anchor); 1315 } 1316 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } 1317 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } 1318 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } 1319 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } 1320 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } 1321 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } 1322 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } 1323 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } 1324 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1325 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } 1326 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1327 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); } 1328 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } 1329 1330 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1331 static ByteSize should_post_on_exceptions_flag_offset() { 1332 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1333 } 1334 1335#if INCLUDE_ALL_GCS 1336 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } 1337 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } 1338#endif // INCLUDE_ALL_GCS 1339 1340 // Returns the jni environment for this thread 1341 JNIEnv* jni_environment() { return &_jni_environment; } 1342 1343 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1344 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1345 // Only return NULL if thread is off the thread list; starting to 1346 // exit should not return NULL. 1347 if (thread_from_jni_env->is_terminated()) { 1348 thread_from_jni_env->block_if_vm_exited(); 1349 return NULL; 1350 } else { 1351 return thread_from_jni_env; 1352 } 1353 } 1354 1355 // JNI critical regions. These can nest. 1356 bool in_critical() { return _jni_active_critical > 0; } 1357 bool in_last_critical() { return _jni_active_critical == 1; } 1358 void enter_critical() { 1359 assert(Thread::current() == this || 1360 (Thread::current()->is_VM_thread() && 1361 SafepointSynchronize::is_synchronizing()), 1362 "this must be current thread or synchronizing"); 1363 _jni_active_critical++; 1364 } 1365 void exit_critical() { 1366 assert(Thread::current() == this, "this must be current thread"); 1367 _jni_active_critical--; 1368 assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); 1369 } 1370 1371 // Checked JNI, is the programmer required to check for exceptions, specify which function name 1372 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1373 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1374 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1375 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1376 1377 // For deadlock detection 1378 int depth_first_number() { return _depth_first_number; } 1379 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1380 1381 private: 1382 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1383 1384 public: 1385 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1386 void add_monitor_chunk(MonitorChunk* chunk); 1387 void remove_monitor_chunk(MonitorChunk* chunk); 1388 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1389 void inc_in_deopt_handler() { _in_deopt_handler++; } 1390 void dec_in_deopt_handler() { 1391 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1392 if (_in_deopt_handler > 0) { // robustness 1393 _in_deopt_handler--; 1394 } 1395 } 1396 1397 private: 1398 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1399 1400 public: 1401 1402 // Frame iteration; calls the function f for all frames on the stack 1403 void frames_do(void f(frame*, const RegisterMap*)); 1404 1405 // Memory operations 1406 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1407 1408 // Sweeper operations 1409 void nmethods_do(CodeBlobClosure* cf); 1410 1411 // RedefineClasses Support 1412 void metadata_do(void f(Metadata*)); 1413 1414 // Misc. operations 1415 char* name() const { return (char*)get_thread_name(); } 1416 void print_on(outputStream* st) const; 1417 void print_value(); 1418 void print_thread_state_on(outputStream*) const PRODUCT_RETURN; 1419 void print_thread_state() const PRODUCT_RETURN; 1420 void print_on_error(outputStream* st, char* buf, int buflen) const; 1421 void verify(); 1422 const char* get_thread_name() const; 1423 private: 1424 // factor out low-level mechanics for use in both normal and error cases 1425 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1426 public: 1427 const char* get_threadgroup_name() const; 1428 const char* get_parent_name() const; 1429 1430 // Accessing frames 1431 frame last_frame() { 1432 _anchor.make_walkable(this); 1433 return pd_last_frame(); 1434 } 1435 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1436 1437 // Returns method at 'depth' java or native frames down the stack 1438 // Used for security checks 1439 Klass* security_get_caller_class(int depth); 1440 1441 // Print stack trace in external format 1442 void print_stack_on(outputStream* st); 1443 void print_stack() { print_stack_on(tty); } 1444 1445 // Print stack traces in various internal formats 1446 void trace_stack() PRODUCT_RETURN; 1447 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1448 void trace_frames() PRODUCT_RETURN; 1449 void trace_oops() PRODUCT_RETURN; 1450 1451 // Print an annotated view of the stack frames 1452 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1453 void validate_frame_layout() { 1454 print_frame_layout(0, true); 1455 } 1456 1457 // Returns the number of stack frames on the stack 1458 int depth() const; 1459 1460 // Function for testing deoptimization 1461 void deoptimize(); 1462 void make_zombies(); 1463 1464 void deoptimized_wrt_marked_nmethods(); 1465 1466 // Profiling operation (see fprofile.cpp) 1467 public: 1468 bool profile_last_Java_frame(frame* fr); 1469 1470 private: 1471 ThreadProfiler* _thread_profiler; 1472 private: 1473 friend class FlatProfiler; // uses both [gs]et_thread_profiler. 1474 friend class FlatProfilerTask; // uses get_thread_profiler. 1475 friend class ThreadProfilerMark; // uses get_thread_profiler. 1476 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } 1477 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { 1478 ThreadProfiler* result = _thread_profiler; 1479 _thread_profiler = tp; 1480 return result; 1481 } 1482 1483 public: 1484 // Returns the running thread as a JavaThread 1485 static inline JavaThread* current(); 1486 1487 // Returns the active Java thread. Do not use this if you know you are calling 1488 // from a JavaThread, as it's slower than JavaThread::current. If called from 1489 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1490 // operation. You may not want that either. 1491 static JavaThread* active(); 1492 1493 inline CompilerThread* as_CompilerThread(); 1494 1495 public: 1496 virtual void run(); 1497 void thread_main_inner(); 1498 1499 private: 1500 // PRIVILEGED STACK 1501 PrivilegedElement* _privileged_stack_top; 1502 GrowableArray<oop>* _array_for_gc; 1503 public: 1504 1505 // Returns the privileged_stack information. 1506 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } 1507 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } 1508 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } 1509 1510 public: 1511 // Thread local information maintained by JVMTI. 1512 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1513 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1514 // getter is used to get this JavaThread's JvmtiThreadState if it has 1515 // one which means NULL can be returned. JvmtiThreadState::state_for() 1516 // is used to get the specified JavaThread's JvmtiThreadState if it has 1517 // one or it allocates a new JvmtiThreadState for the JavaThread and 1518 // returns it. JvmtiThreadState::state_for() will return NULL only if 1519 // the specified JavaThread is exiting. 1520 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1521 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1522 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } 1523 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } 1524 1525 // JVMTI PopFrame support 1526 // Setting and clearing popframe_condition 1527 // All of these enumerated values are bits. popframe_pending 1528 // indicates that a PopFrame() has been requested and not yet been 1529 // completed. popframe_processing indicates that that PopFrame() is in 1530 // the process of being completed. popframe_force_deopt_reexecution_bit 1531 // indicates that special handling is required when returning to a 1532 // deoptimized caller. 1533 enum PopCondition { 1534 popframe_inactive = 0x00, 1535 popframe_pending_bit = 0x01, 1536 popframe_processing_bit = 0x02, 1537 popframe_force_deopt_reexecution_bit = 0x04 1538 }; 1539 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1540 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1541 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1542 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1543 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1544 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1545 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1546 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1547#ifdef CC_INTERP 1548 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } 1549 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } 1550 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1551 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1552 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1553#endif 1554 1555 private: 1556 // Saved incoming arguments to popped frame. 1557 // Used only when popped interpreted frame returns to deoptimized frame. 1558 void* _popframe_preserved_args; 1559 int _popframe_preserved_args_size; 1560 1561 public: 1562 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1563 void* popframe_preserved_args(); 1564 ByteSize popframe_preserved_args_size(); 1565 WordSize popframe_preserved_args_size_in_words(); 1566 void popframe_free_preserved_args(); 1567 1568 1569 private: 1570 JvmtiThreadState *_jvmti_thread_state; 1571 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; 1572 1573 // Used by the interpreter in fullspeed mode for frame pop, method 1574 // entry, method exit and single stepping support. This field is 1575 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. 1576 // It can be set to zero asynchronously (i.e., without a VM operation 1577 // or a lock) so we have to be very careful. 1578 int _interp_only_mode; 1579 1580 public: 1581 // used by the interpreter for fullspeed debugging support (see above) 1582 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1583 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1584 int get_interp_only_mode() { return _interp_only_mode; } 1585 void increment_interp_only_mode() { ++_interp_only_mode; } 1586 void decrement_interp_only_mode() { --_interp_only_mode; } 1587 1588 // support for cached flag that indicates whether exceptions need to be posted for this thread 1589 // if this is false, we can avoid deoptimizing when events are thrown 1590 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1591 private: 1592 int _should_post_on_exceptions_flag; 1593 1594 public: 1595 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1596 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1597 1598 private: 1599 ThreadStatistics *_thread_stat; 1600 1601 public: 1602 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1603 1604 // Return a blocker object for which this thread is blocked parking. 1605 oop current_park_blocker(); 1606 1607 private: 1608 static size_t _stack_size_at_create; 1609 1610 public: 1611 static inline size_t stack_size_at_create(void) { 1612 return _stack_size_at_create; 1613 } 1614 static inline void set_stack_size_at_create(size_t value) { 1615 _stack_size_at_create = value; 1616 } 1617 1618#if INCLUDE_ALL_GCS 1619 // SATB marking queue support 1620 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } 1621 static SATBMarkQueueSet& satb_mark_queue_set() { 1622 return _satb_mark_queue_set; 1623 } 1624 1625 // Dirty card queue support 1626 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } 1627 static DirtyCardQueueSet& dirty_card_queue_set() { 1628 return _dirty_card_queue_set; 1629 } 1630#endif // INCLUDE_ALL_GCS 1631 1632 // This method initializes the SATB and dirty card queues before a 1633 // JavaThread is added to the Java thread list. Right now, we don't 1634 // have to do anything to the dirty card queue (it should have been 1635 // activated when the thread was created), but we have to activate 1636 // the SATB queue if the thread is created while a marking cycle is 1637 // in progress. The activation / de-activation of the SATB queues at 1638 // the beginning / end of a marking cycle is done during safepoints 1639 // so we have to make sure this method is called outside one to be 1640 // able to safely read the active field of the SATB queue set. Right 1641 // now, it is called just before the thread is added to the Java 1642 // thread list in the Threads::add() method. That method is holding 1643 // the Threads_lock which ensures we are outside a safepoint. We 1644 // cannot do the obvious and set the active field of the SATB queue 1645 // when the thread is created given that, in some cases, safepoints 1646 // might happen between the JavaThread constructor being called and the 1647 // thread being added to the Java thread list (an example of this is 1648 // when the structure for the DestroyJavaVM thread is created). 1649#if INCLUDE_ALL_GCS 1650 void initialize_queues(); 1651#else // INCLUDE_ALL_GCS 1652 void initialize_queues() { } 1653#endif // INCLUDE_ALL_GCS 1654 1655 // Machine dependent stuff 1656#ifdef TARGET_OS_ARCH_linux_x86 1657# include "thread_linux_x86.hpp" 1658#endif 1659#ifdef TARGET_OS_ARCH_linux_sparc 1660# include "thread_linux_sparc.hpp" 1661#endif 1662#ifdef TARGET_OS_ARCH_linux_zero 1663# include "thread_linux_zero.hpp" 1664#endif 1665#ifdef TARGET_OS_ARCH_solaris_x86 1666# include "thread_solaris_x86.hpp" 1667#endif 1668#ifdef TARGET_OS_ARCH_solaris_sparc 1669# include "thread_solaris_sparc.hpp" 1670#endif 1671#ifdef TARGET_OS_ARCH_windows_x86 1672# include "thread_windows_x86.hpp" 1673#endif 1674#ifdef TARGET_OS_ARCH_linux_arm 1675# include "thread_linux_arm.hpp" 1676#endif 1677#ifdef TARGET_OS_ARCH_linux_ppc 1678# include "thread_linux_ppc.hpp" 1679#endif 1680#ifdef TARGET_OS_ARCH_aix_ppc 1681# include "thread_aix_ppc.hpp" 1682#endif 1683#ifdef TARGET_OS_ARCH_bsd_x86 1684# include "thread_bsd_x86.hpp" 1685#endif 1686#ifdef TARGET_OS_ARCH_bsd_zero 1687# include "thread_bsd_zero.hpp" 1688#endif 1689 1690 1691 public: 1692 void set_blocked_on_compilation(bool value) { 1693 _blocked_on_compilation = value; 1694 } 1695 1696 bool blocked_on_compilation() { 1697 return _blocked_on_compilation; 1698 } 1699 protected: 1700 bool _blocked_on_compilation; 1701 1702 1703 // JSR166 per-thread parker 1704 private: 1705 Parker* _parker; 1706 public: 1707 Parker* parker() { return _parker; } 1708 1709 // Biased locking support 1710 private: 1711 GrowableArray<MonitorInfo*>* _cached_monitor_info; 1712 public: 1713 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 1714 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 1715 1716 // clearing/querying jni attach status 1717 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 1718 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 1719 inline void set_done_attaching_via_jni(); 1720 private: 1721 // This field is used to determine if a thread has claimed 1722 // a par_id: it is UINT_MAX if the thread has not claimed a par_id; 1723 // otherwise its value is the par_id that has been claimed. 1724 uint _claimed_par_id; 1725 public: 1726 uint get_claimed_par_id() { return _claimed_par_id; } 1727 void set_claimed_par_id(uint id) { _claimed_par_id = id; } 1728}; 1729 1730// Inline implementation of JavaThread::current 1731inline JavaThread* JavaThread::current() { 1732 Thread* thread = ThreadLocalStorage::thread(); 1733 assert(thread != NULL && thread->is_Java_thread(), "just checking"); 1734 return (JavaThread*)thread; 1735} 1736 1737inline CompilerThread* JavaThread::as_CompilerThread() { 1738 assert(is_Compiler_thread(), "just checking"); 1739 return (CompilerThread*)this; 1740} 1741 1742// A thread used for Compilation. 1743class CompilerThread : public JavaThread { 1744 friend class VMStructs; 1745 private: 1746 CompilerCounters* _counters; 1747 1748 ciEnv* _env; 1749 CompileLog* _log; 1750 CompileTask* _task; 1751 CompileQueue* _queue; 1752 BufferBlob* _buffer_blob; 1753 1754 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper 1755 AbstractCompiler* _compiler; 1756 1757 public: 1758 1759 static CompilerThread* current(); 1760 1761 CompilerThread(CompileQueue* queue, CompilerCounters* counters); 1762 1763 bool is_Compiler_thread() const { return true; } 1764 // Hide this compiler thread from external view. 1765 bool is_hidden_from_external_view() const { return true; } 1766 1767 void set_compiler(AbstractCompiler* c) { _compiler = c; } 1768 AbstractCompiler* compiler() const { return _compiler; } 1769 1770 CompileQueue* queue() const { return _queue; } 1771 CompilerCounters* counters() const { return _counters; } 1772 1773 // Get/set the thread's compilation environment. 1774 ciEnv* env() { return _env; } 1775 void set_env(ciEnv* env) { _env = env; } 1776 1777 BufferBlob* get_buffer_blob() const { return _buffer_blob; } 1778 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; } 1779 1780 // Get/set the thread's logging information 1781 CompileLog* log() { return _log; } 1782 void init_log(CompileLog* log) { 1783 // Set once, for good. 1784 assert(_log == NULL, "set only once"); 1785 _log = log; 1786 } 1787 1788 // GC support 1789 // Apply "f->do_oop" to all root oops in "this". 1790 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 1791 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1792 1793#ifndef PRODUCT 1794 private: 1795 IdealGraphPrinter *_ideal_graph_printer; 1796 public: 1797 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } 1798 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } 1799#endif 1800 1801 // Get/set the thread's current task 1802 CompileTask* task() { return _task; } 1803 void set_task(CompileTask* task) { _task = task; } 1804 1805 // Track the nmethod currently being scanned by the sweeper 1806 void set_scanned_nmethod(nmethod* nm) { 1807 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value"); 1808 _scanned_nmethod = nm; 1809 } 1810}; 1811 1812inline CompilerThread* CompilerThread::current() { 1813 return JavaThread::current()->as_CompilerThread(); 1814} 1815 1816// The active thread queue. It also keeps track of the current used 1817// thread priorities. 1818class Threads: AllStatic { 1819 friend class VMStructs; 1820 private: 1821 static JavaThread* _thread_list; 1822 static int _number_of_threads; 1823 static int _number_of_non_daemon_threads; 1824 static int _return_code; 1825#ifdef ASSERT 1826 static bool _vm_complete; 1827#endif 1828 1829 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS); 1830 static void initialize_jsr292_core_classes(TRAPS); 1831 public: 1832 // Thread management 1833 // force_daemon is a concession to JNI, where we may need to add a 1834 // thread to the thread list before allocating its thread object 1835 static void add(JavaThread* p, bool force_daemon = false); 1836 static void remove(JavaThread* p); 1837 static bool includes(JavaThread* p); 1838 static JavaThread* first() { return _thread_list; } 1839 static void threads_do(ThreadClosure* tc); 1840 1841 // Initializes the vm and creates the vm thread 1842 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 1843 static void convert_vm_init_libraries_to_agents(); 1844 static void create_vm_init_libraries(); 1845 static void create_vm_init_agents(); 1846 static void shutdown_vm_agents(); 1847 static bool destroy_vm(); 1848 // Supported VM versions via JNI 1849 // Includes JNI_VERSION_1_1 1850 static jboolean is_supported_jni_version_including_1_1(jint version); 1851 // Does not include JNI_VERSION_1_1 1852 static jboolean is_supported_jni_version(jint version); 1853 1854 // Garbage collection 1855 static void follow_other_roots(void f(oop*)); 1856 1857 // Apply "f->do_oop" to all root oops in all threads. 1858 // This version may only be called by sequential code. 1859 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1860 // This version may be called by sequential or parallel code. 1861 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); 1862 // This creates a list of GCTasks, one per thread. 1863 static void create_thread_roots_tasks(GCTaskQueue* q); 1864 // This creates a list of GCTasks, one per thread, for marking objects. 1865 static void create_thread_roots_marking_tasks(GCTaskQueue* q); 1866 1867 // Apply "f->do_oop" to roots in all threads that 1868 // are part of compiled frames 1869 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); 1870 1871 static void convert_hcode_pointers(); 1872 static void restore_hcode_pointers(); 1873 1874 // Sweeper 1875 static void nmethods_do(CodeBlobClosure* cf); 1876 1877 // RedefineClasses support 1878 static void metadata_do(void f(Metadata*)); 1879 1880#ifdef ASSERT 1881 static bool is_vm_complete() { return _vm_complete; } 1882#endif 1883 1884 // Verification 1885 static void verify(); 1886 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); 1887 static void print(bool print_stacks, bool internal_format) { 1888 // this function is only used by debug.cpp 1889 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); 1890 } 1891 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 1892 1893 // Get Java threads that are waiting to enter a monitor. If doLock 1894 // is true, then Threads_lock is grabbed as needed. Otherwise, the 1895 // VM needs to be at a safepoint. 1896 static GrowableArray<JavaThread*>* get_pending_threads(int count, 1897 address monitor, bool doLock); 1898 1899 // Get owning Java thread from the monitor's owner field. If doLock 1900 // is true, then Threads_lock is grabbed as needed. Otherwise, the 1901 // VM needs to be at a safepoint. 1902 static JavaThread *owning_thread_from_monitor_owner(address owner, 1903 bool doLock); 1904 1905 // Number of threads on the active threads list 1906 static int number_of_threads() { return _number_of_threads; } 1907 // Number of non-daemon threads on the active threads list 1908 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 1909 1910 // Deoptimizes all frames tied to marked nmethods 1911 static void deoptimized_wrt_marked_nmethods(); 1912 1913}; 1914 1915 1916// Thread iterator 1917class ThreadClosure: public StackObj { 1918 public: 1919 virtual void do_thread(Thread* thread) = 0; 1920}; 1921 1922class SignalHandlerMark: public StackObj { 1923 private: 1924 Thread* _thread; 1925 public: 1926 SignalHandlerMark(Thread* t) { 1927 _thread = t; 1928 if (_thread) _thread->enter_signal_handler(); 1929 } 1930 ~SignalHandlerMark() { 1931 if (_thread) _thread->leave_signal_handler(); 1932 _thread = NULL; 1933 } 1934}; 1935 1936 1937#endif // SHARE_VM_RUNTIME_THREAD_HPP 1938