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--- old/src/share/vm/runtime/thread.hpp
+++ new/src/share/vm/runtime/thread.hpp
1 1 /*
2 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
3 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 4 *
5 5 * This code is free software; you can redistribute it and/or modify it
6 6 * under the terms of the GNU General Public License version 2 only, as
7 7 * published by the Free Software Foundation.
8 8 *
9 9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 12 * version 2 for more details (a copy is included in the LICENSE file that
13 13 * accompanied this code).
14 14 *
15 15 * You should have received a copy of the GNU General Public License version
16 16 * 2 along with this work; if not, write to the Free Software Foundation,
17 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 18 *
19 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 21 * have any questions.
22 22 *
23 23 */
24 24
25 25 class ThreadSafepointState;
26 26 class ThreadProfiler;
27 27
28 28 class JvmtiThreadState;
29 29 class JvmtiGetLoadedClassesClosure;
30 30 class ThreadStatistics;
31 31 class ConcurrentLocksDump;
32 32 class ParkEvent ;
33 33
34 34 class ciEnv;
35 35 class CompileThread;
36 36 class CompileLog;
37 37 class CompileTask;
38 38 class CompileQueue;
39 39 class CompilerCounters;
40 40 class vframeArray;
41 41
42 42 class DeoptResourceMark;
43 43 class jvmtiDeferredLocalVariableSet;
44 44
45 45 class GCTaskQueue;
46 46 class ThreadClosure;
47 47 class IdealGraphPrinter;
48 48
49 49 // Class hierarchy
50 50 // - Thread
51 51 // - VMThread
52 52 // - JavaThread
53 53 // - WatcherThread
54 54
55 55 class Thread: public ThreadShadow {
56 56 friend class VMStructs;
57 57 private:
58 58 // Exception handling
59 59 // (Note: _pending_exception and friends are in ThreadShadow)
60 60 //oop _pending_exception; // pending exception for current thread
61 61 // const char* _exception_file; // file information for exception (debugging only)
62 62 // int _exception_line; // line information for exception (debugging only)
63 63
64 64 // Support for forcing alignment of thread objects for biased locking
65 65 void* _real_malloc_address;
66 66 public:
67 67 void* operator new(size_t size);
68 68 void operator delete(void* p);
69 69 private:
70 70
71 71 // ***************************************************************
72 72 // Suspend and resume support
73 73 // ***************************************************************
74 74 //
75 75 // VM suspend/resume no longer exists - it was once used for various
76 76 // things including safepoints but was deprecated and finally removed
77 77 // in Java 7. Because VM suspension was considered "internal" Java-level
78 78 // suspension was considered "external", and this legacy naming scheme
79 79 // remains.
80 80 //
81 81 // External suspend/resume requests come from JVM_SuspendThread,
82 82 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
83 83 // ResumeThread. External
84 84 // suspend requests cause _external_suspend to be set and external
85 85 // resume requests cause _external_suspend to be cleared.
86 86 // External suspend requests do not nest on top of other external
87 87 // suspend requests. The higher level APIs reject suspend requests
88 88 // for already suspended threads.
89 89 //
90 90 // The external_suspend
91 91 // flag is checked by has_special_runtime_exit_condition() and java thread
92 92 // will self-suspend when handle_special_runtime_exit_condition() is
93 93 // called. Most uses of the _thread_blocked state in JavaThreads are
94 94 // considered the same as being externally suspended; if the blocking
95 95 // condition lifts, the JavaThread will self-suspend. Other places
96 96 // where VM checks for external_suspend include:
97 97 // + mutex granting (do not enter monitors when thread is suspended)
98 98 // + state transitions from _thread_in_native
99 99 //
100 100 // In general, java_suspend() does not wait for an external suspend
101 101 // request to complete. When it returns, the only guarantee is that
102 102 // the _external_suspend field is true.
103 103 //
104 104 // wait_for_ext_suspend_completion() is used to wait for an external
105 105 // suspend request to complete. External suspend requests are usually
106 106 // followed by some other interface call that requires the thread to
107 107 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
108 108 // the interface that requires quiescence, we give the JavaThread a
109 109 // chance to self-suspend before we need it to be quiescent. This
110 110 // improves overall suspend/query performance.
111 111 //
112 112 // _suspend_flags controls the behavior of java_ suspend/resume.
113 113 // It must be set under the protection of SR_lock. Read from the flag is
114 114 // OK without SR_lock as long as the value is only used as a hint.
115 115 // (e.g., check _external_suspend first without lock and then recheck
116 116 // inside SR_lock and finish the suspension)
117 117 //
118 118 // _suspend_flags is also overloaded for other "special conditions" so
119 119 // that a single check indicates whether any special action is needed
120 120 // eg. for async exceptions.
121 121 // -------------------------------------------------------------------
122 122 // Notes:
123 123 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
124 124 // but we still update its value to keep other part of the system (mainly
125 125 // JVMTI) happy. ThreadState is legacy code (see notes in
126 126 // osThread.hpp).
127 127 //
128 128 // 2. It would be more natural if set_external_suspend() is private and
129 129 // part of java_suspend(), but that probably would affect the suspend/query
130 130 // performance. Need more investigation on this.
131 131 //
132 132
133 133 // suspend/resume lock: used for self-suspend
134 134 Monitor* _SR_lock;
135 135
136 136 protected:
137 137 enum SuspendFlags {
138 138 // NOTE: avoid using the sign-bit as cc generates different test code
139 139 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
140 140
141 141 _external_suspend = 0x20000000U, // thread is asked to self suspend
142 142 _ext_suspended = 0x40000000U, // thread has self-suspended
143 143 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
144 144
145 145 _has_async_exception = 0x00000001U // there is a pending async exception
146 146 };
147 147
148 148 // various suspension related flags - atomically updated
149 149 // overloaded for async exception checking in check_special_condition_for_native_trans.
150 150 volatile uint32_t _suspend_flags;
151 151
152 152 private:
153 153 int _num_nested_signal;
154 154
155 155 public:
156 156 void enter_signal_handler() { _num_nested_signal++; }
157 157 void leave_signal_handler() { _num_nested_signal--; }
158 158 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
159 159
160 160 private:
161 161 // Debug tracing
162 162 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
163 163
164 164 // Active_handles points to a block of handles
165 165 JNIHandleBlock* _active_handles;
166 166
167 167 // One-element thread local free list
168 168 JNIHandleBlock* _free_handle_block;
169 169
170 170 // Point to the last handle mark
171 171 HandleMark* _last_handle_mark;
172 172
173 173 // The parity of the last strong_roots iteration in which this thread was
174 174 // claimed as a task.
175 175 jint _oops_do_parity;
176 176
177 177 public:
178 178 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
179 179 HandleMark* last_handle_mark() const { return _last_handle_mark; }
180 180 private:
181 181
182 182 // debug support for checking if code does allow safepoints or not
183 183 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
184 184 // mutex, or blocking on an object synchronizer (Java locking).
185 185 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
186 186 // If !allow_allocation(), then an assertion failure will happen during allocation
187 187 // (Hence, !allow_safepoint() => !allow_allocation()).
188 188 //
189 189 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
190 190 //
191 191 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
192 192 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
193 193
194 194 // Used by SkipGCALot class.
195 195 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
196 196
197 197 // Record when GC is locked out via the GC_locker mechanism
198 198 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;)
199 199
200 200 friend class No_Alloc_Verifier;
201 201 friend class No_Safepoint_Verifier;
202 202 friend class Pause_No_Safepoint_Verifier;
203 203 friend class ThreadLocalStorage;
204 204 friend class GC_locker;
205 205
206 206 ThreadLocalAllocBuffer _tlab; // Thread-local eden
207 207
208 208 int _vm_operation_started_count; // VM_Operation support
209 209 int _vm_operation_completed_count; // VM_Operation support
210 210
211 211 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
212 212 // is waiting to lock
213 213 bool _current_pending_monitor_is_from_java; // locking is from Java code
214 214
215 215 // ObjectMonitor on which this thread called Object.wait()
216 216 ObjectMonitor* _current_waiting_monitor;
217 217
218 218 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
219 219 public:
220 220 ObjectMonitor * omFreeList ;
221 221 int omFreeCount ; // length of omFreeList
222 222 int omFreeProvision ; // reload chunk size
223 223
224 224 public:
225 225 enum {
226 226 is_definitely_current_thread = true
227 227 };
228 228
229 229 // Constructor
230 230 Thread();
231 231 virtual ~Thread();
232 232
233 233 // initializtion
234 234 void initialize_thread_local_storage();
235 235
236 236 // thread entry point
237 237 virtual void run();
238 238
239 239 // Testers
240 240 virtual bool is_VM_thread() const { return false; }
241 241 virtual bool is_Java_thread() const { return false; }
242 242 // Remove this ifdef when C1 is ported to the compiler interface.
243 243 virtual bool is_Compiler_thread() const { return false; }
244 244 virtual bool is_hidden_from_external_view() const { return false; }
245 245 virtual bool is_jvmti_agent_thread() const { return false; }
246 246 // True iff the thread can perform GC operations at a safepoint.
247 247 // Generally will be true only of VM thread and parallel GC WorkGang
248 248 // threads.
249 249 virtual bool is_GC_task_thread() const { return false; }
250 250 virtual bool is_Watcher_thread() const { return false; }
251 251 virtual bool is_ConcurrentGC_thread() const { return false; }
252 252
253 253 virtual char* name() const { return (char*)"Unknown thread"; }
254 254
255 255 // Returns the current thread
256 256 static inline Thread* current();
257 257
258 258 // Common thread operations
259 259 static void set_priority(Thread* thread, ThreadPriority priority);
260 260 static ThreadPriority get_priority(const Thread* const thread);
261 261 static void start(Thread* thread);
262 262 static void interrupt(Thread* thr);
263 263 static bool is_interrupted(Thread* thr, bool clear_interrupted);
264 264
265 265 Monitor* SR_lock() const { return _SR_lock; }
266 266
267 267 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
268 268
269 269 void set_suspend_flag(SuspendFlags f) {
270 270 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
271 271 uint32_t flags;
272 272 do {
273 273 flags = _suspend_flags;
274 274 }
275 275 while (Atomic::cmpxchg((jint)(flags | f),
276 276 (volatile jint*)&_suspend_flags,
277 277 (jint)flags) != (jint)flags);
278 278 }
279 279 void clear_suspend_flag(SuspendFlags f) {
280 280 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
281 281 uint32_t flags;
282 282 do {
283 283 flags = _suspend_flags;
284 284 }
285 285 while (Atomic::cmpxchg((jint)(flags & ~f),
286 286 (volatile jint*)&_suspend_flags,
287 287 (jint)flags) != (jint)flags);
288 288 }
289 289
290 290 void set_has_async_exception() {
291 291 set_suspend_flag(_has_async_exception);
292 292 }
293 293 void clear_has_async_exception() {
294 294 clear_suspend_flag(_has_async_exception);
295 295 }
296 296
297 297 // Support for Unhandled Oop detection
298 298 #ifdef CHECK_UNHANDLED_OOPS
299 299 private:
300 300 UnhandledOops *_unhandled_oops;
301 301 public:
302 302 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
303 303 // Mark oop safe for gc. It may be stack allocated but won't move.
304 304 void allow_unhandled_oop(oop *op) {
305 305 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
306 306 }
307 307 // Clear oops at safepoint so crashes point to unhandled oop violator
308 308 void clear_unhandled_oops() {
309 309 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
310 310 }
311 311 bool is_gc_locked_out() { return _gc_locked_out_count > 0; }
312 312 #endif // CHECK_UNHANDLED_OOPS
313 313
314 314 #ifndef PRODUCT
315 315 bool skip_gcalot() { return _skip_gcalot; }
316 316 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
317 317 #endif
318 318
319 319 public:
320 320 // Installs a pending exception to be inserted later
321 321 static void send_async_exception(oop thread_oop, oop java_throwable);
322 322
323 323 // Resource area
324 324 ResourceArea* resource_area() const { return _resource_area; }
325 325 void set_resource_area(ResourceArea* area) { _resource_area = area; }
326 326
327 327 OSThread* osthread() const { return _osthread; }
328 328 void set_osthread(OSThread* thread) { _osthread = thread; }
329 329
330 330 // JNI handle support
331 331 JNIHandleBlock* active_handles() const { return _active_handles; }
332 332 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
333 333 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
334 334 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
335 335
336 336 // Internal handle support
337 337 HandleArea* handle_area() const { return _handle_area; }
338 338 void set_handle_area(HandleArea* area) { _handle_area = area; }
339 339
340 340 // Thread-Local Allocation Buffer (TLAB) support
341 341 ThreadLocalAllocBuffer& tlab() { return _tlab; }
342 342 void initialize_tlab() {
343 343 if (UseTLAB) {
344 344 tlab().initialize();
345 345 }
346 346 }
347 347
348 348 // VM operation support
349 349 int vm_operation_ticket() { return ++_vm_operation_started_count; }
350 350 int vm_operation_completed_count() { return _vm_operation_completed_count; }
351 351 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
352 352
353 353 // For tracking the heavyweight monitor the thread is pending on.
354 354 ObjectMonitor* current_pending_monitor() {
355 355 return _current_pending_monitor;
356 356 }
357 357 void set_current_pending_monitor(ObjectMonitor* monitor) {
358 358 _current_pending_monitor = monitor;
359 359 }
360 360 void set_current_pending_monitor_is_from_java(bool from_java) {
361 361 _current_pending_monitor_is_from_java = from_java;
362 362 }
363 363 bool current_pending_monitor_is_from_java() {
364 364 return _current_pending_monitor_is_from_java;
365 365 }
366 366
367 367 // For tracking the ObjectMonitor on which this thread called Object.wait()
368 368 ObjectMonitor* current_waiting_monitor() {
369 369 return _current_waiting_monitor;
370 370 }
371 371 void set_current_waiting_monitor(ObjectMonitor* monitor) {
372 372 _current_waiting_monitor = monitor;
373 373 }
374 374
375 375 // GC support
376 376 // Apply "f->do_oop" to all root oops in "this".
377 377 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
378 378 void oops_do(OopClosure* f, CodeBlobClosure* cf);
379 379
380 380 // Handles the parallel case for the method below.
381 381 private:
382 382 bool claim_oops_do_par_case(int collection_parity);
383 383 public:
384 384 // Requires that "collection_parity" is that of the current strong roots
385 385 // iteration. If "is_par" is false, sets the parity of "this" to
386 386 // "collection_parity", and returns "true". If "is_par" is true,
387 387 // uses an atomic instruction to set the current threads parity to
388 388 // "collection_parity", if it is not already. Returns "true" iff the
389 389 // calling thread does the update, this indicates that the calling thread
390 390 // has claimed the thread's stack as a root groop in the current
391 391 // collection.
392 392 bool claim_oops_do(bool is_par, int collection_parity) {
393 393 if (!is_par) {
394 394 _oops_do_parity = collection_parity;
395 395 return true;
396 396 } else {
397 397 return claim_oops_do_par_case(collection_parity);
398 398 }
399 399 }
400 400
401 401 // Sweeper support
402 402 void nmethods_do(CodeBlobClosure* cf);
403 403
404 404 // Tells if adr belong to this thread. This is used
405 405 // for checking if a lock is owned by the running thread.
406 406
407 407 // Used by fast lock support
408 408 virtual bool is_lock_owned(address adr) const;
409 409
410 410 // Check if address is in the stack of the thread (not just for locks).
411 411 // Warning: the method can only be used on the running thread
412 412 bool is_in_stack(address adr) const;
413 413
414 414 // Sets this thread as starting thread. Returns failure if thread
415 415 // creation fails due to lack of memory, too many threads etc.
416 416 bool set_as_starting_thread();
417 417
418 418 protected:
419 419 // OS data associated with the thread
420 420 OSThread* _osthread; // Platform-specific thread information
421 421
422 422 // Thread local resource area for temporary allocation within the VM
423 423 ResourceArea* _resource_area;
424 424
425 425 // Thread local handle area for allocation of handles within the VM
426 426 HandleArea* _handle_area;
427 427
428 428 // Support for stack overflow handling, get_thread, etc.
429 429 address _stack_base;
430 430 size_t _stack_size;
431 431 uintptr_t _self_raw_id; // used by get_thread (mutable)
432 432 int _lgrp_id;
433 433
434 434 public:
435 435 // Stack overflow support
436 436 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
437 437
438 438 void set_stack_base(address base) { _stack_base = base; }
439 439 size_t stack_size() const { return _stack_size; }
440 440 void set_stack_size(size_t size) { _stack_size = size; }
441 441 void record_stack_base_and_size();
442 442
443 443 int lgrp_id() const { return _lgrp_id; }
444 444 void set_lgrp_id(int value) { _lgrp_id = value; }
445 445
446 446 // Printing
447 447 void print_on(outputStream* st) const;
448 448 void print() const { print_on(tty); }
449 449 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
450 450
451 451 // Debug-only code
452 452
453 453 #ifdef ASSERT
454 454 private:
455 455 // Deadlock detection support for Mutex locks. List of locks own by thread.
456 456 Monitor *_owned_locks;
457 457 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
458 458 // thus the friendship
459 459 friend class Mutex;
460 460 friend class Monitor;
461 461
462 462 public:
463 463 void print_owned_locks_on(outputStream* st) const;
464 464 void print_owned_locks() const { print_owned_locks_on(tty); }
465 465 Monitor * owned_locks() const { return _owned_locks; }
466 466 bool owns_locks() const { return owned_locks() != NULL; }
467 467 bool owns_locks_but_compiled_lock() const;
468 468
469 469 // Deadlock detection
470 470 bool allow_allocation() { return _allow_allocation_count == 0; }
471 471 #endif
472 472
473 473 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
474 474
475 475 private:
476 476 volatile int _jvmti_env_iteration_count;
477 477
478 478 public:
479 479 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
480 480 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
481 481 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
482 482
483 483 // Code generation
484 484 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
485 485 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
486 486 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
487 487
488 488 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
489 489 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
490 490 static ByteSize omFreeList_offset() { return byte_offset_of(Thread, omFreeList); }
491 491
492 492 #define TLAB_FIELD_OFFSET(name) \
493 493 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
494 494
495 495 TLAB_FIELD_OFFSET(start)
496 496 TLAB_FIELD_OFFSET(end)
497 497 TLAB_FIELD_OFFSET(top)
498 498 TLAB_FIELD_OFFSET(pf_top)
499 499 TLAB_FIELD_OFFSET(size) // desired_size
500 500 TLAB_FIELD_OFFSET(refill_waste_limit)
501 501 TLAB_FIELD_OFFSET(number_of_refills)
502 502 TLAB_FIELD_OFFSET(fast_refill_waste)
503 503 TLAB_FIELD_OFFSET(slow_allocations)
504 504
505 505 #undef TLAB_FIELD_OFFSET
506 506
507 507 public:
508 508 volatile intptr_t _Stalled ;
509 509 volatile int _TypeTag ;
510 510 ParkEvent * _ParkEvent ; // for synchronized()
511 511 ParkEvent * _SleepEvent ; // for Thread.sleep
512 512 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
513 513 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
514 514 int NativeSyncRecursion ; // diagnostic
515 515
516 516 volatile int _OnTrap ; // Resume-at IP delta
517 517 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
518 518 jint _hashStateX ; // thread-specific hashCode generator state
519 519 jint _hashStateY ;
520 520 jint _hashStateZ ;
521 521 void * _schedctl ;
522 522
523 523 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code
524 524 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); }
525 525 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); }
526 526
527 527 volatile jint rng [4] ; // RNG for spin loop
528 528
529 529 // Low-level leaf-lock primitives used to implement synchronization
530 530 // and native monitor-mutex infrastructure.
531 531 // Not for general synchronization use.
532 532 static void SpinAcquire (volatile int * Lock, const char * Name) ;
533 533 static void SpinRelease (volatile int * Lock) ;
534 534 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
535 535 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
536 536 static void muxRelease (volatile intptr_t * Lock) ;
537 537
538 538 };
539 539
540 540 // Inline implementation of Thread::current()
541 541 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
542 542 // startup.
543 543 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
544 544 // period. This is inlined in thread_<os_family>.inline.hpp.
545 545
546 546 inline Thread* Thread::current() {
547 547 #ifdef ASSERT
548 548 // This function is very high traffic. Define PARANOID to enable expensive
549 549 // asserts.
550 550 #ifdef PARANOID
551 551 // Signal handler should call ThreadLocalStorage::get_thread_slow()
552 552 Thread* t = ThreadLocalStorage::get_thread_slow();
553 553 assert(t != NULL && !t->is_inside_signal_handler(),
554 554 "Don't use Thread::current() inside signal handler");
555 555 #endif
556 556 #endif
557 557 Thread* thread = ThreadLocalStorage::thread();
558 558 assert(thread != NULL, "just checking");
559 559 return thread;
560 560 }
561 561
562 562 // Name support for threads. non-JavaThread subclasses with multiple
563 563 // uniquely named instances should derive from this.
564 564 class NamedThread: public Thread {
565 565 friend class VMStructs;
566 566 enum {
567 567 max_name_len = 64
568 568 };
569 569 private:
570 570 char* _name;
571 571 public:
572 572 NamedThread();
573 573 ~NamedThread();
574 574 // May only be called once per thread.
575 575 void set_name(const char* format, ...);
576 576 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
577 577 };
578 578
579 579 // Worker threads are named and have an id of an assigned work.
580 580 class WorkerThread: public NamedThread {
581 581 private:
582 582 uint _id;
583 583 public:
584 584 WorkerThread() : _id(0) { }
585 585 void set_id(uint work_id) { _id = work_id; }
586 586 uint id() const { return _id; }
587 587 };
588 588
589 589 // A single WatcherThread is used for simulating timer interrupts.
590 590 class WatcherThread: public Thread {
591 591 friend class VMStructs;
592 592 public:
593 593 virtual void run();
594 594
595 595 private:
596 596 static WatcherThread* _watcher_thread;
597 597
598 598 static bool _should_terminate;
599 599 public:
600 600 enum SomeConstants {
601 601 delay_interval = 10 // interrupt delay in milliseconds
602 602 };
603 603
604 604 // Constructor
605 605 WatcherThread();
606 606
607 607 // Tester
608 608 bool is_Watcher_thread() const { return true; }
609 609
610 610 // Printing
611 611 char* name() const { return (char*)"VM Periodic Task Thread"; }
612 612 void print_on(outputStream* st) const;
613 613 void print() const { print_on(tty); }
614 614
615 615 // Returns the single instance of WatcherThread
616 616 static WatcherThread* watcher_thread() { return _watcher_thread; }
617 617
618 618 // Create and start the single instance of WatcherThread, or stop it on shutdown
619 619 static void start();
620 620 static void stop();
621 621 };
622 622
623 623
624 624 class CompilerThread;
625 625
626 626 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
627 627
628 628 class JavaThread: public Thread {
629 629 friend class VMStructs;
630 630 private:
631 631 JavaThread* _next; // The next thread in the Threads list
632 632 oop _threadObj; // The Java level thread object
633 633
634 634 #ifdef ASSERT
635 635 private:
636 636 int _java_call_counter;
637 637
638 638 public:
639 639 int java_call_counter() { return _java_call_counter; }
640 640 void inc_java_call_counter() { _java_call_counter++; }
641 641 void dec_java_call_counter() {
642 642 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
643 643 _java_call_counter--;
644 644 }
645 645 private: // restore original namespace restriction
646 646 #endif // ifdef ASSERT
647 647
648 648 #ifndef PRODUCT
649 649 public:
650 650 enum {
651 651 jump_ring_buffer_size = 16
652 652 };
653 653 private: // restore original namespace restriction
654 654 #endif
655 655
656 656 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
657 657
658 658 ThreadFunction _entry_point;
659 659
660 660 JNIEnv _jni_environment;
661 661
662 662 // Deopt support
663 663 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
664 664
665 665 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
666 666 // transition out of native
667 667
668 668 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
669 669 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
670 670 // Because deoptimization is lazy we must save jvmti requests to set locals
671 671 // in compiled frames until we deoptimize and we have an interpreter frame.
672 672 // This holds the pointer to array (yeah like there might be more than one) of
673 673 // description of compiled vframes that have locals that need to be updated.
674 674 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
675 675
676 676 // Handshake value for fixing 6243940. We need a place for the i2c
677 677 // adapter to store the callee methodOop. This value is NEVER live
678 678 // across a gc point so it does NOT have to be gc'd
679 679 // The handshake is open ended since we can't be certain that it will
680 680 // be NULLed. This is because we rarely ever see the race and end up
681 681 // in handle_wrong_method which is the backend of the handshake. See
682 682 // code in i2c adapters and handle_wrong_method.
683 683
684 684 methodOop _callee_target;
685 685
686 686 // Oop results of VM runtime calls
687 687 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved
688 688 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved
689 689
690 690 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
691 691 // allocated during deoptimization
692 692 // and by JNI_MonitorEnter/Exit
693 693
694 694 // Async. requests support
695 695 enum AsyncRequests {
696 696 _no_async_condition = 0,
697 697 _async_exception,
698 698 _async_unsafe_access_error
699 699 };
700 700 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
701 701 oop _pending_async_exception;
702 702
703 703 // Safepoint support
704 704 public: // Expose _thread_state for SafeFetchInt()
705 705 volatile JavaThreadState _thread_state;
706 706 private:
707 707 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
708 708 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
709 709
710 710 // JavaThread termination support
711 711 enum TerminatedTypes {
712 712 _not_terminated = 0xDEAD - 2,
713 713 _thread_exiting, // JavaThread::exit() has been called for this thread
714 714 _thread_terminated, // JavaThread is removed from thread list
715 715 _vm_exited // JavaThread is still executing native code, but VM is terminated
716 716 // only VM_Exit can set _vm_exited
717 717 };
718 718
719 719 // In general a JavaThread's _terminated field transitions as follows:
720 720 //
721 721 // _not_terminated => _thread_exiting => _thread_terminated
722 722 //
723 723 // _vm_exited is a special value to cover the case of a JavaThread
724 724 // executing native code after the VM itself is terminated.
725 725 TerminatedTypes _terminated;
726 726 // suspend/resume support
727 727 volatile bool _suspend_equivalent; // Suspend equivalent condition
728 728 jint _in_deopt_handler; // count of deoptimization
729 729 // handlers thread is in
730 730 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
731 731 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
732 732 // never locked) when throwing an exception. Used by interpreter only.
733 733
734 734 // Flag to mark a JNI thread in the process of attaching - See CR 6404306
735 735 // This flag is never set true other than at construction, and in that case
736 736 // is shortly thereafter set false
737 737 volatile bool _is_attaching;
738 738
739 739 public:
740 740 // State of the stack guard pages for this thread.
741 741 enum StackGuardState {
742 742 stack_guard_unused, // not needed
743 743 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
744 744 stack_guard_enabled // enabled
745 745 };
746 746
747 747 private:
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748 748
749 749 StackGuardState _stack_guard_state;
750 750
751 751 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
752 752 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
753 753 // code)
754 754 volatile oop _exception_oop; // Exception thrown in compiled code
755 755 volatile address _exception_pc; // PC where exception happened
756 756 volatile address _exception_handler_pc; // PC for handler of exception
757 757 volatile int _exception_stack_size; // Size of frame where exception happened
758 + volatile int _is_method_handle_exception; // True if the current exception PC is at a MethodHandle call.
758 759
759 760 // support for compilation
760 761 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible)
761 762
762 763 // support for JNI critical regions
763 764 jint _jni_active_critical; // count of entries into JNI critical region
764 765
765 766 // For deadlock detection.
766 767 int _depth_first_number;
767 768
768 769 // JVMTI PopFrame support
769 770 // This is set to popframe_pending to signal that top Java frame should be popped immediately
770 771 int _popframe_condition;
771 772
772 773 #ifndef PRODUCT
773 774 int _jmp_ring_index;
774 775 struct {
775 776 // We use intptr_t instead of address so debugger doesn't try and display strings
776 777 intptr_t _target;
777 778 intptr_t _instruction;
778 779 const char* _file;
779 780 int _line;
780 781 } _jmp_ring[ jump_ring_buffer_size ];
781 782 #endif /* PRODUCT */
782 783
783 784 #ifndef SERIALGC
784 785 // Support for G1 barriers
785 786
786 787 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
787 788 // Set of all such queues.
788 789 static SATBMarkQueueSet _satb_mark_queue_set;
789 790
790 791 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
791 792 // Set of all such queues.
792 793 static DirtyCardQueueSet _dirty_card_queue_set;
793 794
794 795 void flush_barrier_queues();
795 796 #endif // !SERIALGC
796 797
797 798 friend class VMThread;
798 799 friend class ThreadWaitTransition;
799 800 friend class VM_Exit;
800 801
801 802 void initialize(); // Initialized the instance variables
802 803
803 804 public:
804 805 // Constructor
805 806 JavaThread(bool is_attaching = false); // for main thread and JNI attached threads
806 807 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
807 808 ~JavaThread();
808 809
809 810 #ifdef ASSERT
810 811 // verify this JavaThread hasn't be published in the Threads::list yet
811 812 void verify_not_published();
812 813 #endif
813 814
814 815 //JNI functiontable getter/setter for JVMTI jni function table interception API.
815 816 void set_jni_functions(struct JNINativeInterface_* functionTable) {
816 817 _jni_environment.functions = functionTable;
817 818 }
818 819 struct JNINativeInterface_* get_jni_functions() {
819 820 return (struct JNINativeInterface_ *)_jni_environment.functions;
820 821 }
821 822
822 823 // Executes Shutdown.shutdown()
823 824 void invoke_shutdown_hooks();
824 825
825 826 // Cleanup on thread exit
826 827 enum ExitType {
827 828 normal_exit,
828 829 jni_detach
829 830 };
830 831 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
831 832
832 833 void cleanup_failed_attach_current_thread();
833 834
834 835 // Testers
835 836 virtual bool is_Java_thread() const { return true; }
836 837
837 838 // compilation
838 839 void set_is_compiling(bool f) { _is_compiling = f; }
839 840 bool is_compiling() const { return _is_compiling; }
840 841
841 842 // Thread chain operations
842 843 JavaThread* next() const { return _next; }
843 844 void set_next(JavaThread* p) { _next = p; }
844 845
845 846 // Thread oop. threadObj() can be NULL for initial JavaThread
846 847 // (or for threads attached via JNI)
847 848 oop threadObj() const { return _threadObj; }
848 849 void set_threadObj(oop p) { _threadObj = p; }
849 850
850 851 ThreadPriority java_priority() const; // Read from threadObj()
851 852
852 853 // Prepare thread and add to priority queue. If a priority is
853 854 // not specified, use the priority of the thread object. Threads_lock
854 855 // must be held while this function is called.
855 856 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
856 857
857 858 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
858 859 address saved_exception_pc() { return _saved_exception_pc; }
859 860
860 861
861 862 ThreadFunction entry_point() const { return _entry_point; }
862 863
863 864 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
864 865 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
865 866
866 867 // Last frame anchor routines
867 868
868 869 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
869 870
870 871 // last_Java_sp
871 872 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
872 873 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
873 874
874 875 // last_Java_pc
875 876
876 877 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
877 878
878 879 // Safepoint support
879 880 JavaThreadState thread_state() const { return _thread_state; }
880 881 void set_thread_state(JavaThreadState s) { _thread_state=s; }
881 882 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
882 883 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
883 884 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
884 885
885 886 // thread has called JavaThread::exit() or is terminated
886 887 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
887 888 // thread is terminated (no longer on the threads list); we compare
888 889 // against the two non-terminated values so that a freed JavaThread
889 890 // will also be considered terminated.
890 891 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
891 892 void set_terminated(TerminatedTypes t) { _terminated = t; }
892 893 // special for Threads::remove() which is static:
893 894 void set_terminated_value() { _terminated = _thread_terminated; }
894 895 void block_if_vm_exited();
895 896
896 897 bool doing_unsafe_access() { return _doing_unsafe_access; }
897 898 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
898 899
899 900 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
900 901 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
901 902
902 903
903 904 // Suspend/resume support for JavaThread
904 905
905 906 private:
906 907 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
907 908 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
908 909
909 910 public:
910 911 void java_suspend();
911 912 void java_resume();
912 913 int java_suspend_self();
913 914
914 915 void check_and_wait_while_suspended() {
915 916 assert(JavaThread::current() == this, "sanity check");
916 917
917 918 bool do_self_suspend;
918 919 do {
919 920 // were we externally suspended while we were waiting?
920 921 do_self_suspend = handle_special_suspend_equivalent_condition();
921 922 if (do_self_suspend) {
922 923 // don't surprise the thread that suspended us by returning
923 924 java_suspend_self();
924 925 set_suspend_equivalent();
925 926 }
926 927 } while (do_self_suspend);
927 928 }
928 929 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
929 930 // Check for async exception in addition to safepoint and suspend request.
930 931 static void check_special_condition_for_native_trans(JavaThread *thread);
931 932
932 933 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
933 934 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
934 935 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
935 936 // Warning: is_ext_suspend_completed() may temporarily drop the
936 937 // SR_lock to allow the thread to reach a stable thread state if
937 938 // it is currently in a transient thread state.
938 939 return is_ext_suspend_completed(false /*!called_by_wait */,
939 940 SuspendRetryDelay, bits);
940 941 }
941 942
942 943 // We cannot allow wait_for_ext_suspend_completion() to run forever or
943 944 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
944 945 // passed as the count and delay parameters. Experiments with specific
945 946 // calls to wait_for_ext_suspend_completion() can be done by passing
946 947 // other values in the code. Experiments with all calls can be done
947 948 // via the appropriate -XX options.
948 949 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
949 950
950 951 void set_external_suspend() { set_suspend_flag (_external_suspend); }
951 952 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
952 953
953 954 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
954 955 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
955 956 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
956 957
957 958 bool is_external_suspend() const {
958 959 return (_suspend_flags & _external_suspend) != 0;
959 960 }
960 961 // Whenever a thread transitions from native to vm/java it must suspend
961 962 // if external|deopt suspend is present.
962 963 bool is_suspend_after_native() const {
963 964 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
964 965 }
965 966
966 967 // external suspend request is completed
967 968 bool is_ext_suspended() const {
968 969 return (_suspend_flags & _ext_suspended) != 0;
969 970 }
970 971
971 972 bool is_external_suspend_with_lock() const {
972 973 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
973 974 return is_external_suspend();
974 975 }
975 976
976 977 // Special method to handle a pending external suspend request
977 978 // when a suspend equivalent condition lifts.
978 979 bool handle_special_suspend_equivalent_condition() {
979 980 assert(is_suspend_equivalent(),
980 981 "should only be called in a suspend equivalence condition");
981 982 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
982 983 bool ret = is_external_suspend();
983 984 if (!ret) {
984 985 // not about to self-suspend so clear suspend equivalence
985 986 clear_suspend_equivalent();
986 987 }
987 988 // implied else:
988 989 // We have a pending external suspend request so we leave the
989 990 // suspend_equivalent flag set until java_suspend_self() sets
990 991 // the ext_suspended flag and clears the suspend_equivalent
991 992 // flag. This insures that wait_for_ext_suspend_completion()
992 993 // will return consistent values.
993 994 return ret;
994 995 }
995 996
996 997 // utility methods to see if we are doing some kind of suspension
997 998 bool is_being_ext_suspended() const {
998 999 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
999 1000 return is_ext_suspended() || is_external_suspend();
1000 1001 }
1001 1002
1002 1003 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1003 1004
1004 1005 void set_suspend_equivalent() { _suspend_equivalent = true; };
1005 1006 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1006 1007
1007 1008 // Thread.stop support
1008 1009 void send_thread_stop(oop throwable);
1009 1010 AsyncRequests clear_special_runtime_exit_condition() {
1010 1011 AsyncRequests x = _special_runtime_exit_condition;
1011 1012 _special_runtime_exit_condition = _no_async_condition;
1012 1013 return x;
1013 1014 }
1014 1015
1015 1016 // Are any async conditions present?
1016 1017 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1017 1018
1018 1019 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1019 1020
1020 1021 // these next two are also used for self-suspension and async exception support
1021 1022 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1022 1023
1023 1024 // Return true if JavaThread has an asynchronous condition or
1024 1025 // if external suspension is requested.
1025 1026 bool has_special_runtime_exit_condition() {
1026 1027 // We call is_external_suspend() last since external suspend should
1027 1028 // be less common. Because we don't use is_external_suspend_with_lock
1028 1029 // it is possible that we won't see an asynchronous external suspend
1029 1030 // request that has just gotten started, i.e., SR_lock grabbed but
1030 1031 // _external_suspend field change either not made yet or not visible
1031 1032 // yet. However, this is okay because the request is asynchronous and
1032 1033 // we will see the new flag value the next time through. It's also
1033 1034 // possible that the external suspend request is dropped after
1034 1035 // we have checked is_external_suspend(), we will recheck its value
1035 1036 // under SR_lock in java_suspend_self().
1036 1037 return (_special_runtime_exit_condition != _no_async_condition) ||
1037 1038 is_external_suspend() || is_deopt_suspend();
1038 1039 }
1039 1040
1040 1041 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1041 1042
1042 1043 void set_pending_async_exception(oop e) {
1043 1044 _pending_async_exception = e;
1044 1045 _special_runtime_exit_condition = _async_exception;
1045 1046 set_has_async_exception();
1046 1047 }
1047 1048
1048 1049 // Fast-locking support
1049 1050 bool is_lock_owned(address adr) const;
1050 1051
1051 1052 // Accessors for vframe array top
1052 1053 // The linked list of vframe arrays are sorted on sp. This means when we
1053 1054 // unpack the head must contain the vframe array to unpack.
1054 1055 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1055 1056 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1056 1057
1057 1058 // Side structure for defering update of java frame locals until deopt occurs
1058 1059 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1059 1060 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1060 1061
1061 1062 // These only really exist to make debugging deopt problems simpler
1062 1063
1063 1064 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1064 1065 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1065 1066
1066 1067 // The special resourceMark used during deoptimization
1067 1068
1068 1069 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1069 1070 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1070 1071
1071 1072 intptr_t* must_deopt_id() { return _must_deopt_id; }
1072 1073 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1073 1074 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1074 1075
1075 1076 methodOop callee_target() const { return _callee_target; }
1076 1077 void set_callee_target (methodOop x) { _callee_target = x; }
1077 1078
1078 1079 // Oop results of vm runtime calls
1079 1080 oop vm_result() const { return _vm_result; }
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1080 1081 void set_vm_result (oop x) { _vm_result = x; }
1081 1082
1082 1083 oop vm_result_2() const { return _vm_result_2; }
1083 1084 void set_vm_result_2 (oop x) { _vm_result_2 = x; }
1084 1085
1085 1086 // Exception handling for compiled methods
1086 1087 oop exception_oop() const { return _exception_oop; }
1087 1088 int exception_stack_size() const { return _exception_stack_size; }
1088 1089 address exception_pc() const { return _exception_pc; }
1089 1090 address exception_handler_pc() const { return _exception_handler_pc; }
1091 + int is_method_handle_exception() const { return _is_method_handle_exception; }
1090 1092
1091 1093 void set_exception_oop(oop o) { _exception_oop = o; }
1092 1094 void set_exception_pc(address a) { _exception_pc = a; }
1093 1095 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1094 1096 void set_exception_stack_size(int size) { _exception_stack_size = size; }
1097 + void set_is_method_handle_exception(int value) { _is_method_handle_exception = value; }
1095 1098
1096 1099 // Stack overflow support
1097 1100 inline size_t stack_available(address cur_sp);
1098 1101 address stack_yellow_zone_base()
1099 1102 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1100 1103 size_t stack_yellow_zone_size()
1101 1104 { return StackYellowPages * os::vm_page_size(); }
1102 1105 address stack_red_zone_base()
1103 1106 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1104 1107 size_t stack_red_zone_size()
1105 1108 { return StackRedPages * os::vm_page_size(); }
1106 1109 bool in_stack_yellow_zone(address a)
1107 1110 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1108 1111 bool in_stack_red_zone(address a)
1109 1112 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1110 1113
1111 1114 void create_stack_guard_pages();
1112 1115 void remove_stack_guard_pages();
1113 1116
1114 1117 void enable_stack_yellow_zone();
1115 1118 void disable_stack_yellow_zone();
1116 1119 void enable_stack_red_zone();
1117 1120 void disable_stack_red_zone();
1118 1121
1119 1122 inline bool stack_yellow_zone_disabled();
1120 1123 inline bool stack_yellow_zone_enabled();
1121 1124
1122 1125 // Attempt to reguard the stack after a stack overflow may have occurred.
1123 1126 // Returns true if (a) guard pages are not needed on this thread, (b) the
1124 1127 // pages are already guarded, or (c) the pages were successfully reguarded.
1125 1128 // Returns false if there is not enough stack space to reguard the pages, in
1126 1129 // which case the caller should unwind a frame and try again. The argument
1127 1130 // should be the caller's (approximate) sp.
1128 1131 bool reguard_stack(address cur_sp);
1129 1132 // Similar to above but see if current stackpoint is out of the guard area
1130 1133 // and reguard if possible.
1131 1134 bool reguard_stack(void);
1132 1135
1133 1136 // Misc. accessors/mutators
1134 1137 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1135 1138 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1136 1139 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1137 1140
1138 1141 #ifndef PRODUCT
1139 1142 void record_jump(address target, address instr, const char* file, int line);
1140 1143 #endif /* PRODUCT */
1141 1144
1142 1145 // For assembly stub generation
1143 1146 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1144 1147 #ifndef PRODUCT
1145 1148 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1146 1149 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1147 1150 #endif /* PRODUCT */
1148 1151 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1149 1152 static ByteSize last_Java_sp_offset() {
1150 1153 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1151 1154 }
1152 1155 static ByteSize last_Java_pc_offset() {
1153 1156 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1154 1157 }
1155 1158 static ByteSize frame_anchor_offset() {
1156 1159 return byte_offset_of(JavaThread, _anchor);
1157 1160 }
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1158 1161 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1159 1162 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1160 1163 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1161 1164 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1162 1165 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1163 1166 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1164 1167 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1165 1168 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1166 1169 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1167 1170 static ByteSize exception_stack_size_offset() { return byte_offset_of(JavaThread, _exception_stack_size); }
1171 + static ByteSize is_method_handle_exception_offset() { return byte_offset_of(JavaThread, _is_method_handle_exception); }
1168 1172 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1169 1173 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1170 1174
1171 1175 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1172 1176
1173 1177 #ifndef SERIALGC
1174 1178 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1175 1179 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1176 1180 #endif // !SERIALGC
1177 1181
1178 1182 // Returns the jni environment for this thread
1179 1183 JNIEnv* jni_environment() { return &_jni_environment; }
1180 1184
1181 1185 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1182 1186 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1183 1187 // Only return NULL if thread is off the thread list; starting to
1184 1188 // exit should not return NULL.
1185 1189 if (thread_from_jni_env->is_terminated()) {
1186 1190 thread_from_jni_env->block_if_vm_exited();
1187 1191 return NULL;
1188 1192 } else {
1189 1193 return thread_from_jni_env;
1190 1194 }
1191 1195 }
1192 1196
1193 1197 // JNI critical regions. These can nest.
1194 1198 bool in_critical() { return _jni_active_critical > 0; }
1195 1199 void enter_critical() { assert(Thread::current() == this,
1196 1200 "this must be current thread");
1197 1201 _jni_active_critical++; }
1198 1202 void exit_critical() { assert(Thread::current() == this,
1199 1203 "this must be current thread");
1200 1204 _jni_active_critical--;
1201 1205 assert(_jni_active_critical >= 0,
1202 1206 "JNI critical nesting problem?"); }
1203 1207
1204 1208 // For deadlock detection
1205 1209 int depth_first_number() { return _depth_first_number; }
1206 1210 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1207 1211
1208 1212 private:
1209 1213 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1210 1214
1211 1215 public:
1212 1216 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1213 1217 void add_monitor_chunk(MonitorChunk* chunk);
1214 1218 void remove_monitor_chunk(MonitorChunk* chunk);
1215 1219 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1216 1220 void inc_in_deopt_handler() { _in_deopt_handler++; }
1217 1221 void dec_in_deopt_handler() {
1218 1222 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1219 1223 if (_in_deopt_handler > 0) { // robustness
1220 1224 _in_deopt_handler--;
1221 1225 }
1222 1226 }
1223 1227
1224 1228 private:
1225 1229 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1226 1230
1227 1231 public:
1228 1232
1229 1233 // Frame iteration; calls the function f for all frames on the stack
1230 1234 void frames_do(void f(frame*, const RegisterMap*));
1231 1235
1232 1236 // Memory operations
1233 1237 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1234 1238
1235 1239 // Sweeper operations
1236 1240 void nmethods_do(CodeBlobClosure* cf);
1237 1241
1238 1242 // Memory management operations
1239 1243 void gc_epilogue();
1240 1244 void gc_prologue();
1241 1245
1242 1246 // Misc. operations
1243 1247 char* name() const { return (char*)get_thread_name(); }
1244 1248 void print_on(outputStream* st) const;
1245 1249 void print() const { print_on(tty); }
1246 1250 void print_value();
1247 1251 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1248 1252 void print_thread_state() const PRODUCT_RETURN;
1249 1253 void print_on_error(outputStream* st, char* buf, int buflen) const;
1250 1254 void verify();
1251 1255 const char* get_thread_name() const;
1252 1256 private:
1253 1257 // factor out low-level mechanics for use in both normal and error cases
1254 1258 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1255 1259 public:
1256 1260 const char* get_threadgroup_name() const;
1257 1261 const char* get_parent_name() const;
1258 1262
1259 1263 // Accessing frames
1260 1264 frame last_frame() {
1261 1265 _anchor.make_walkable(this);
1262 1266 return pd_last_frame();
1263 1267 }
1264 1268 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1265 1269
1266 1270 // Returns method at 'depth' java or native frames down the stack
1267 1271 // Used for security checks
1268 1272 klassOop security_get_caller_class(int depth);
1269 1273
1270 1274 // Print stack trace in external format
1271 1275 void print_stack_on(outputStream* st);
1272 1276 void print_stack() { print_stack_on(tty); }
1273 1277
1274 1278 // Print stack traces in various internal formats
1275 1279 void trace_stack() PRODUCT_RETURN;
1276 1280 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1277 1281 void trace_frames() PRODUCT_RETURN;
1278 1282
1279 1283 // Returns the number of stack frames on the stack
1280 1284 int depth() const;
1281 1285
1282 1286 // Function for testing deoptimization
1283 1287 void deoptimize();
1284 1288 void make_zombies();
1285 1289
1286 1290 void deoptimized_wrt_marked_nmethods();
1287 1291
1288 1292 // Profiling operation (see fprofile.cpp)
1289 1293 public:
1290 1294 bool profile_last_Java_frame(frame* fr);
1291 1295
1292 1296 private:
1293 1297 ThreadProfiler* _thread_profiler;
1294 1298 private:
1295 1299 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1296 1300 friend class FlatProfilerTask; // uses get_thread_profiler.
1297 1301 friend class ThreadProfilerMark; // uses get_thread_profiler.
1298 1302 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1299 1303 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1300 1304 ThreadProfiler* result = _thread_profiler;
1301 1305 _thread_profiler = tp;
1302 1306 return result;
1303 1307 }
1304 1308
1305 1309 // Static operations
1306 1310 public:
1307 1311 // Returns the running thread as a JavaThread
1308 1312 static inline JavaThread* current();
1309 1313
1310 1314 // Returns the active Java thread. Do not use this if you know you are calling
1311 1315 // from a JavaThread, as it's slower than JavaThread::current. If called from
1312 1316 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1313 1317 // operation. You may not want that either.
1314 1318 static JavaThread* active();
1315 1319
1316 1320 inline CompilerThread* as_CompilerThread();
1317 1321
1318 1322 public:
1319 1323 virtual void run();
1320 1324 void thread_main_inner();
1321 1325
1322 1326 private:
1323 1327 // PRIVILEGED STACK
1324 1328 PrivilegedElement* _privileged_stack_top;
1325 1329 GrowableArray<oop>* _array_for_gc;
1326 1330 public:
1327 1331
1328 1332 // Returns the privileged_stack information.
1329 1333 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1330 1334 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1331 1335 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1332 1336
1333 1337 public:
1334 1338 // Thread local information maintained by JVMTI.
1335 1339 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1336 1340 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1337 1341 // getter is used to get this JavaThread's JvmtiThreadState if it has
1338 1342 // one which means NULL can be returned. JvmtiThreadState::state_for()
1339 1343 // is used to get the specified JavaThread's JvmtiThreadState if it has
1340 1344 // one or it allocates a new JvmtiThreadState for the JavaThread and
1341 1345 // returns it. JvmtiThreadState::state_for() will return NULL only if
1342 1346 // the specified JavaThread is exiting.
1343 1347 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1344 1348 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1345 1349 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1346 1350 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1347 1351
1348 1352 // JVMTI PopFrame support
1349 1353 // Setting and clearing popframe_condition
1350 1354 // All of these enumerated values are bits. popframe_pending
1351 1355 // indicates that a PopFrame() has been requested and not yet been
1352 1356 // completed. popframe_processing indicates that that PopFrame() is in
1353 1357 // the process of being completed. popframe_force_deopt_reexecution_bit
1354 1358 // indicates that special handling is required when returning to a
1355 1359 // deoptimized caller.
1356 1360 enum PopCondition {
1357 1361 popframe_inactive = 0x00,
1358 1362 popframe_pending_bit = 0x01,
1359 1363 popframe_processing_bit = 0x02,
1360 1364 popframe_force_deopt_reexecution_bit = 0x04
1361 1365 };
1362 1366 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1363 1367 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1364 1368 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1365 1369 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1366 1370 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1367 1371 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1368 1372 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1369 1373 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1370 1374 #ifdef CC_INTERP
1371 1375 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1372 1376 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1373 1377 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1374 1378 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1375 1379 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1376 1380 #endif
1377 1381
1378 1382 private:
1379 1383 // Saved incoming arguments to popped frame.
1380 1384 // Used only when popped interpreted frame returns to deoptimized frame.
1381 1385 void* _popframe_preserved_args;
1382 1386 int _popframe_preserved_args_size;
1383 1387
1384 1388 public:
1385 1389 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1386 1390 void* popframe_preserved_args();
1387 1391 ByteSize popframe_preserved_args_size();
1388 1392 WordSize popframe_preserved_args_size_in_words();
1389 1393 void popframe_free_preserved_args();
1390 1394
1391 1395
1392 1396 private:
1393 1397 JvmtiThreadState *_jvmti_thread_state;
1394 1398 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1395 1399
1396 1400 // Used by the interpreter in fullspeed mode for frame pop, method
1397 1401 // entry, method exit and single stepping support. This field is
1398 1402 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1399 1403 // It can be set to zero asynchronously (i.e., without a VM operation
1400 1404 // or a lock) so we have to be very careful.
1401 1405 int _interp_only_mode;
1402 1406
1403 1407 public:
1404 1408 // used by the interpreter for fullspeed debugging support (see above)
1405 1409 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1406 1410 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1407 1411 int get_interp_only_mode() { return _interp_only_mode; }
1408 1412 void increment_interp_only_mode() { ++_interp_only_mode; }
1409 1413 void decrement_interp_only_mode() { --_interp_only_mode; }
1410 1414
1411 1415 private:
1412 1416 ThreadStatistics *_thread_stat;
1413 1417
1414 1418 public:
1415 1419 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1416 1420
1417 1421 // Return a blocker object for which this thread is blocked parking.
1418 1422 oop current_park_blocker();
1419 1423
1420 1424 private:
1421 1425 static size_t _stack_size_at_create;
1422 1426
1423 1427 public:
1424 1428 static inline size_t stack_size_at_create(void) {
1425 1429 return _stack_size_at_create;
1426 1430 }
1427 1431 static inline void set_stack_size_at_create(size_t value) {
1428 1432 _stack_size_at_create = value;
1429 1433 }
1430 1434
1431 1435 #ifndef SERIALGC
1432 1436 // SATB marking queue support
1433 1437 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1434 1438 static SATBMarkQueueSet& satb_mark_queue_set() {
1435 1439 return _satb_mark_queue_set;
1436 1440 }
1437 1441
1438 1442 // Dirty card queue support
1439 1443 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1440 1444 static DirtyCardQueueSet& dirty_card_queue_set() {
1441 1445 return _dirty_card_queue_set;
1442 1446 }
1443 1447 #endif // !SERIALGC
1444 1448
1445 1449 // Machine dependent stuff
1446 1450 #include "incls/_thread_pd.hpp.incl"
1447 1451
1448 1452 public:
1449 1453 void set_blocked_on_compilation(bool value) {
1450 1454 _blocked_on_compilation = value;
1451 1455 }
1452 1456
1453 1457 bool blocked_on_compilation() {
1454 1458 return _blocked_on_compilation;
1455 1459 }
1456 1460 protected:
1457 1461 bool _blocked_on_compilation;
1458 1462
1459 1463
1460 1464 // JSR166 per-thread parker
1461 1465 private:
1462 1466 Parker* _parker;
1463 1467 public:
1464 1468 Parker* parker() { return _parker; }
1465 1469
1466 1470 // Biased locking support
1467 1471 private:
1468 1472 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1469 1473 public:
1470 1474 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1471 1475 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1472 1476
1473 1477 // clearing/querying jni attach status
1474 1478 bool is_attaching() const { return _is_attaching; }
1475 1479 void set_attached() { _is_attaching = false; OrderAccess::fence(); }
1476 1480 private:
1477 1481 // This field is used to determine if a thread has claimed
1478 1482 // a par_id: it is -1 if the thread has not claimed a par_id;
1479 1483 // otherwise its value is the par_id that has been claimed.
1480 1484 int _claimed_par_id;
1481 1485 public:
1482 1486 int get_claimed_par_id() { return _claimed_par_id; }
1483 1487 void set_claimed_par_id(int id) { _claimed_par_id = id;}
1484 1488 };
1485 1489
1486 1490 // Inline implementation of JavaThread::current
1487 1491 inline JavaThread* JavaThread::current() {
1488 1492 Thread* thread = ThreadLocalStorage::thread();
1489 1493 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1490 1494 return (JavaThread*)thread;
1491 1495 }
1492 1496
1493 1497 inline CompilerThread* JavaThread::as_CompilerThread() {
1494 1498 assert(is_Compiler_thread(), "just checking");
1495 1499 return (CompilerThread*)this;
1496 1500 }
1497 1501
1498 1502 inline bool JavaThread::stack_yellow_zone_disabled() {
1499 1503 return _stack_guard_state == stack_guard_yellow_disabled;
1500 1504 }
1501 1505
1502 1506 inline bool JavaThread::stack_yellow_zone_enabled() {
1503 1507 #ifdef ASSERT
1504 1508 if (os::uses_stack_guard_pages()) {
1505 1509 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1506 1510 }
1507 1511 #endif
1508 1512 return _stack_guard_state == stack_guard_enabled;
1509 1513 }
1510 1514
1511 1515 inline size_t JavaThread::stack_available(address cur_sp) {
1512 1516 // This code assumes java stacks grow down
1513 1517 address low_addr; // Limit on the address for deepest stack depth
1514 1518 if ( _stack_guard_state == stack_guard_unused) {
1515 1519 low_addr = stack_base() - stack_size();
1516 1520 } else {
1517 1521 low_addr = stack_yellow_zone_base();
1518 1522 }
1519 1523 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1520 1524 }
1521 1525
1522 1526 // A JavaThread for low memory detection support
1523 1527 class LowMemoryDetectorThread : public JavaThread {
1524 1528 friend class VMStructs;
1525 1529 public:
1526 1530 LowMemoryDetectorThread(ThreadFunction entry_point) : JavaThread(entry_point) {};
1527 1531
1528 1532 // Hide this thread from external view.
1529 1533 bool is_hidden_from_external_view() const { return true; }
1530 1534 };
1531 1535
1532 1536 // A thread used for Compilation.
1533 1537 class CompilerThread : public JavaThread {
1534 1538 friend class VMStructs;
1535 1539 private:
1536 1540 CompilerCounters* _counters;
1537 1541
1538 1542 ciEnv* _env;
1539 1543 CompileLog* _log;
1540 1544 CompileTask* _task;
1541 1545 CompileQueue* _queue;
1542 1546
1543 1547 public:
1544 1548
1545 1549 static CompilerThread* current();
1546 1550
1547 1551 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1548 1552
1549 1553 bool is_Compiler_thread() const { return true; }
1550 1554 // Hide this compiler thread from external view.
1551 1555 bool is_hidden_from_external_view() const { return true; }
1552 1556
1553 1557 CompileQueue* queue() { return _queue; }
1554 1558 CompilerCounters* counters() { return _counters; }
1555 1559
1556 1560 // Get/set the thread's compilation environment.
1557 1561 ciEnv* env() { return _env; }
1558 1562 void set_env(ciEnv* env) { _env = env; }
1559 1563
1560 1564 // Get/set the thread's logging information
1561 1565 CompileLog* log() { return _log; }
1562 1566 void init_log(CompileLog* log) {
1563 1567 // Set once, for good.
1564 1568 assert(_log == NULL, "set only once");
1565 1569 _log = log;
1566 1570 }
1567 1571
1568 1572 #ifndef PRODUCT
1569 1573 private:
1570 1574 IdealGraphPrinter *_ideal_graph_printer;
1571 1575 public:
1572 1576 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1573 1577 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1574 1578 #endif
1575 1579
1576 1580 // Get/set the thread's current task
1577 1581 CompileTask* task() { return _task; }
1578 1582 void set_task(CompileTask* task) { _task = task; }
1579 1583 };
1580 1584
1581 1585 inline CompilerThread* CompilerThread::current() {
1582 1586 return JavaThread::current()->as_CompilerThread();
1583 1587 }
1584 1588
1585 1589
1586 1590 // The active thread queue. It also keeps track of the current used
1587 1591 // thread priorities.
1588 1592 class Threads: AllStatic {
1589 1593 friend class VMStructs;
1590 1594 private:
1591 1595 static JavaThread* _thread_list;
1592 1596 static int _number_of_threads;
1593 1597 static int _number_of_non_daemon_threads;
1594 1598 static int _return_code;
1595 1599
1596 1600 public:
1597 1601 // Thread management
1598 1602 // force_daemon is a concession to JNI, where we may need to add a
1599 1603 // thread to the thread list before allocating its thread object
1600 1604 static void add(JavaThread* p, bool force_daemon = false);
1601 1605 static void remove(JavaThread* p);
1602 1606 static bool includes(JavaThread* p);
1603 1607 static JavaThread* first() { return _thread_list; }
1604 1608 static void threads_do(ThreadClosure* tc);
1605 1609
1606 1610 // Initializes the vm and creates the vm thread
1607 1611 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1608 1612 static void convert_vm_init_libraries_to_agents();
1609 1613 static void create_vm_init_libraries();
1610 1614 static void create_vm_init_agents();
1611 1615 static void shutdown_vm_agents();
1612 1616 static bool destroy_vm();
1613 1617 // Supported VM versions via JNI
1614 1618 // Includes JNI_VERSION_1_1
1615 1619 static jboolean is_supported_jni_version_including_1_1(jint version);
1616 1620 // Does not include JNI_VERSION_1_1
1617 1621 static jboolean is_supported_jni_version(jint version);
1618 1622
1619 1623 // Garbage collection
1620 1624 static void follow_other_roots(void f(oop*));
1621 1625
1622 1626 // Apply "f->do_oop" to all root oops in all threads.
1623 1627 // This version may only be called by sequential code.
1624 1628 static void oops_do(OopClosure* f, CodeBlobClosure* cf);
1625 1629 // This version may be called by sequential or parallel code.
1626 1630 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf);
1627 1631 // This creates a list of GCTasks, one per thread.
1628 1632 static void create_thread_roots_tasks(GCTaskQueue* q);
1629 1633 // This creates a list of GCTasks, one per thread, for marking objects.
1630 1634 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1631 1635
1632 1636 // Apply "f->do_oop" to roots in all threads that
1633 1637 // are part of compiled frames
1634 1638 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1635 1639
1636 1640 static void convert_hcode_pointers();
1637 1641 static void restore_hcode_pointers();
1638 1642
1639 1643 // Sweeper
1640 1644 static void nmethods_do(CodeBlobClosure* cf);
1641 1645
1642 1646 static void gc_epilogue();
1643 1647 static void gc_prologue();
1644 1648
1645 1649 // Verification
1646 1650 static void verify();
1647 1651 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1648 1652 static void print(bool print_stacks, bool internal_format) {
1649 1653 // this function is only used by debug.cpp
1650 1654 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1651 1655 }
1652 1656 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1653 1657
1654 1658 // Get Java threads that are waiting to enter a monitor. If doLock
1655 1659 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1656 1660 // VM needs to be at a safepoint.
1657 1661 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1658 1662 address monitor, bool doLock);
1659 1663
1660 1664 // Get owning Java thread from the monitor's owner field. If doLock
1661 1665 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1662 1666 // VM needs to be at a safepoint.
1663 1667 static JavaThread *owning_thread_from_monitor_owner(address owner,
1664 1668 bool doLock);
1665 1669
1666 1670 // Number of threads on the active threads list
1667 1671 static int number_of_threads() { return _number_of_threads; }
1668 1672 // Number of non-daemon threads on the active threads list
1669 1673 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1670 1674
1671 1675 // Deoptimizes all frames tied to marked nmethods
1672 1676 static void deoptimized_wrt_marked_nmethods();
1673 1677
1674 1678 };
1675 1679
1676 1680
1677 1681 // Thread iterator
1678 1682 class ThreadClosure: public StackObj {
1679 1683 public:
1680 1684 virtual void do_thread(Thread* thread) = 0;
1681 1685 };
1682 1686
1683 1687 class SignalHandlerMark: public StackObj {
1684 1688 private:
1685 1689 Thread* _thread;
1686 1690 public:
1687 1691 SignalHandlerMark(Thread* t) {
1688 1692 _thread = t;
1689 1693 if (_thread) _thread->enter_signal_handler();
1690 1694 }
1691 1695 ~SignalHandlerMark() {
1692 1696 if (_thread) _thread->leave_signal_handler();
1693 1697 _thread = NULL;
1694 1698 }
1695 1699 };
1696 1700
1697 1701 // ParkEvents are type-stable and immortal.
1698 1702 //
1699 1703 // Lifecycle: Once a ParkEvent is associated with a thread that ParkEvent remains
1700 1704 // associated with the thread for the thread's entire lifetime - the relationship is
1701 1705 // stable. A thread will be associated at most one ParkEvent. When the thread
1702 1706 // expires, the ParkEvent moves to the EventFreeList. New threads attempt to allocate from
1703 1707 // the EventFreeList before creating a new Event. Type-stability frees us from
1704 1708 // worrying about stale Event or Thread references in the objectMonitor subsystem.
1705 1709 // (A reference to ParkEvent is always valid, even though the event may no longer be associated
1706 1710 // with the desired or expected thread. A key aspect of this design is that the callers of
1707 1711 // park, unpark, etc must tolerate stale references and spurious wakeups).
1708 1712 //
1709 1713 // Only the "associated" thread can block (park) on the ParkEvent, although
1710 1714 // any other thread can unpark a reachable parkevent. Park() is allowed to
1711 1715 // return spuriously. In fact park-unpark a really just an optimization to
1712 1716 // avoid unbounded spinning and surrender the CPU to be a polite system citizen.
1713 1717 // A degenerate albeit "impolite" park-unpark implementation could simply return.
1714 1718 // See http://blogs.sun.com/dave for more details.
1715 1719 //
1716 1720 // Eventually I'd like to eliminate Events and ObjectWaiters, both of which serve as
1717 1721 // thread proxies, and simply make the THREAD structure type-stable and persistent.
1718 1722 // Currently, we unpark events associated with threads, but ideally we'd just
1719 1723 // unpark threads.
1720 1724 //
1721 1725 // The base-class, PlatformEvent, is platform-specific while the ParkEvent is
1722 1726 // platform-independent. PlatformEvent provides park(), unpark(), etc., and
1723 1727 // is abstract -- that is, a PlatformEvent should never be instantiated except
1724 1728 // as part of a ParkEvent.
1725 1729 // Equivalently we could have defined a platform-independent base-class that
1726 1730 // exported Allocate(), Release(), etc. The platform-specific class would extend
1727 1731 // that base-class, adding park(), unpark(), etc.
1728 1732 //
1729 1733 // A word of caution: The JVM uses 2 very similar constructs:
1730 1734 // 1. ParkEvent are used for Java-level "monitor" synchronization.
1731 1735 // 2. Parkers are used by JSR166-JUC park-unpark.
1732 1736 //
1733 1737 // We'll want to eventually merge these redundant facilities and use ParkEvent.
1734 1738
1735 1739
1736 1740 class ParkEvent : public os::PlatformEvent {
1737 1741 private:
1738 1742 ParkEvent * FreeNext ;
1739 1743
1740 1744 // Current association
1741 1745 Thread * AssociatedWith ;
1742 1746 intptr_t RawThreadIdentity ; // LWPID etc
1743 1747 volatile int Incarnation ;
1744 1748
1745 1749 // diagnostic : keep track of last thread to wake this thread.
1746 1750 // this is useful for construction of dependency graphs.
1747 1751 void * LastWaker ;
1748 1752
1749 1753 public:
1750 1754 // MCS-CLH list linkage and Native Mutex/Monitor
1751 1755 ParkEvent * volatile ListNext ;
1752 1756 ParkEvent * volatile ListPrev ;
1753 1757 volatile intptr_t OnList ;
1754 1758 volatile int TState ;
1755 1759 volatile int Notified ; // for native monitor construct
1756 1760 volatile int IsWaiting ; // Enqueued on WaitSet
1757 1761
1758 1762
1759 1763 private:
1760 1764 static ParkEvent * volatile FreeList ;
1761 1765 static volatile int ListLock ;
1762 1766
1763 1767 // It's prudent to mark the dtor as "private"
1764 1768 // ensuring that it's not visible outside the package.
1765 1769 // Unfortunately gcc warns about such usage, so
1766 1770 // we revert to the less desirable "protected" visibility.
1767 1771 // The other compilers accept private dtors.
1768 1772
1769 1773 protected: // Ensure dtor is never invoked
1770 1774 ~ParkEvent() { guarantee (0, "invariant") ; }
1771 1775
1772 1776 ParkEvent() : PlatformEvent() {
1773 1777 AssociatedWith = NULL ;
1774 1778 FreeNext = NULL ;
1775 1779 ListNext = NULL ;
1776 1780 ListPrev = NULL ;
1777 1781 OnList = 0 ;
1778 1782 TState = 0 ;
1779 1783 Notified = 0 ;
1780 1784 IsWaiting = 0 ;
1781 1785 }
1782 1786
1783 1787 // We use placement-new to force ParkEvent instances to be
1784 1788 // aligned on 256-byte address boundaries. This ensures that the least
1785 1789 // significant byte of a ParkEvent address is always 0.
1786 1790
1787 1791 void * operator new (size_t sz) ;
1788 1792 void operator delete (void * a) ;
1789 1793
1790 1794 public:
1791 1795 static ParkEvent * Allocate (Thread * t) ;
1792 1796 static void Release (ParkEvent * e) ;
1793 1797 } ;
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