Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.hpp @ 484:ffe19141e312
Merge
author | jmasa |
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date | Fri, 12 Dec 2008 15:37:46 -0800 |
parents | da9cb4e97a5f |
children | ad8c8ca4ab0f |
rev | line source |
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0 | 1 /* |
2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 class ThreadSafepointState; | |
26 class ThreadProfiler; | |
27 | |
28 class JvmtiThreadState; | |
29 class JvmtiGetLoadedClassesClosure; | |
30 class ThreadStatistics; | |
31 class ConcurrentLocksDump; | |
32 class ParkEvent ; | |
33 | |
34 class ciEnv; | |
35 class CompileThread; | |
36 class CompileLog; | |
37 class CompileTask; | |
38 class CompileQueue; | |
39 class CompilerCounters; | |
40 class vframeArray; | |
41 | |
42 class DeoptResourceMark; | |
43 class jvmtiDeferredLocalVariableSet; | |
44 | |
45 class GCTaskQueue; | |
46 class ThreadClosure; | |
47 class IdealGraphPrinter; | |
48 | |
49 // Class hierarchy | |
50 // - Thread | |
51 // - VMThread | |
52 // - JavaThread | |
53 // - WatcherThread | |
54 | |
55 class Thread: public ThreadShadow { | |
56 friend class VMStructs; | |
57 private: | |
58 // Exception handling | |
59 // (Note: _pending_exception and friends are in ThreadShadow) | |
60 //oop _pending_exception; // pending exception for current thread | |
61 // const char* _exception_file; // file information for exception (debugging only) | |
62 // int _exception_line; // line information for exception (debugging only) | |
63 | |
64 // Support for forcing alignment of thread objects for biased locking | |
65 void* _real_malloc_address; | |
66 public: | |
67 void* operator new(size_t size); | |
68 void operator delete(void* p); | |
69 private: | |
70 | |
71 // *************************************************************** | |
72 // Suspend and resume support | |
73 // *************************************************************** | |
74 // | |
75 // VM suspend/resume no longer exists - it was once used for various | |
76 // things including safepoints but was deprecated and finally removed | |
77 // in Java 7. Because VM suspension was considered "internal" Java-level | |
78 // suspension was considered "external", and this legacy naming scheme | |
79 // remains. | |
80 // | |
81 // External suspend/resume requests come from JVM_SuspendThread, | |
82 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI | |
83 // ResumeThread. External | |
84 // suspend requests cause _external_suspend to be set and external | |
85 // resume requests cause _external_suspend to be cleared. | |
86 // External suspend requests do not nest on top of other external | |
87 // suspend requests. The higher level APIs reject suspend requests | |
88 // for already suspended threads. | |
89 // | |
90 // The external_suspend | |
91 // flag is checked by has_special_runtime_exit_condition() and java thread | |
92 // will self-suspend when handle_special_runtime_exit_condition() is | |
93 // called. Most uses of the _thread_blocked state in JavaThreads are | |
94 // considered the same as being externally suspended; if the blocking | |
95 // condition lifts, the JavaThread will self-suspend. Other places | |
96 // where VM checks for external_suspend include: | |
97 // + mutex granting (do not enter monitors when thread is suspended) | |
98 // + state transitions from _thread_in_native | |
99 // | |
100 // In general, java_suspend() does not wait for an external suspend | |
101 // request to complete. When it returns, the only guarantee is that | |
102 // the _external_suspend field is true. | |
103 // | |
104 // wait_for_ext_suspend_completion() is used to wait for an external | |
105 // suspend request to complete. External suspend requests are usually | |
106 // followed by some other interface call that requires the thread to | |
107 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into | |
108 // the interface that requires quiescence, we give the JavaThread a | |
109 // chance to self-suspend before we need it to be quiescent. This | |
110 // improves overall suspend/query performance. | |
111 // | |
112 // _suspend_flags controls the behavior of java_ suspend/resume. | |
113 // It must be set under the protection of SR_lock. Read from the flag is | |
114 // OK without SR_lock as long as the value is only used as a hint. | |
115 // (e.g., check _external_suspend first without lock and then recheck | |
116 // inside SR_lock and finish the suspension) | |
117 // | |
118 // _suspend_flags is also overloaded for other "special conditions" so | |
119 // that a single check indicates whether any special action is needed | |
120 // eg. for async exceptions. | |
121 // ------------------------------------------------------------------- | |
122 // Notes: | |
123 // 1. The suspend/resume logic no longer uses ThreadState in OSThread | |
124 // but we still update its value to keep other part of the system (mainly | |
125 // JVMTI) happy. ThreadState is legacy code (see notes in | |
126 // osThread.hpp). | |
127 // | |
128 // 2. It would be more natural if set_external_suspend() is private and | |
129 // part of java_suspend(), but that probably would affect the suspend/query | |
130 // performance. Need more investigation on this. | |
131 // | |
132 | |
133 // suspend/resume lock: used for self-suspend | |
134 Monitor* _SR_lock; | |
135 | |
136 protected: | |
137 enum SuspendFlags { | |
138 // NOTE: avoid using the sign-bit as cc generates different test code | |
139 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 | |
140 | |
141 _external_suspend = 0x20000000U, // thread is asked to self suspend | |
142 _ext_suspended = 0x40000000U, // thread has self-suspended | |
143 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt | |
144 | |
145 _has_async_exception = 0x00000001U // there is a pending async exception | |
146 }; | |
147 | |
148 // various suspension related flags - atomically updated | |
149 // overloaded for async exception checking in check_special_condition_for_native_trans. | |
150 volatile uint32_t _suspend_flags; | |
151 | |
152 private: | |
153 int _num_nested_signal; | |
154 | |
155 public: | |
156 void enter_signal_handler() { _num_nested_signal++; } | |
157 void leave_signal_handler() { _num_nested_signal--; } | |
158 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } | |
159 | |
160 private: | |
161 // Debug tracing | |
162 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; | |
163 | |
164 // Active_handles points to a block of handles | |
165 JNIHandleBlock* _active_handles; | |
166 | |
167 // One-element thread local free list | |
168 JNIHandleBlock* _free_handle_block; | |
169 | |
170 // Point to the last handle mark | |
171 HandleMark* _last_handle_mark; | |
172 | |
173 // The parity of the last strong_roots iteration in which this thread was | |
174 // claimed as a task. | |
175 jint _oops_do_parity; | |
176 | |
177 public: | |
178 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } | |
179 HandleMark* last_handle_mark() const { return _last_handle_mark; } | |
180 private: | |
181 | |
182 // debug support for checking if code does allow safepoints or not | |
183 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on | |
184 // mutex, or blocking on an object synchronizer (Java locking). | |
185 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases | |
186 // If !allow_allocation(), then an assertion failure will happen during allocation | |
187 // (Hence, !allow_safepoint() => !allow_allocation()). | |
188 // | |
189 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. | |
190 // | |
191 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen | |
192 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. | |
193 | |
194 // Record when GC is locked out via the GC_locker mechanism | |
195 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;) | |
196 | |
197 friend class No_Alloc_Verifier; | |
198 friend class No_Safepoint_Verifier; | |
199 friend class Pause_No_Safepoint_Verifier; | |
200 friend class ThreadLocalStorage; | |
201 friend class GC_locker; | |
202 | |
203 // In order for all threads to be able to use fast locking, we need to know the highest stack | |
204 // address of where a lock is on the stack (stacks normally grow towards lower addresses). This | |
205 // variable is initially set to NULL, indicating no locks are used by the thread. During the thread's | |
206 // execution, it will be set whenever locking can happen, i.e., when we call out to Java code or use | |
207 // an ObjectLocker. The value is never decreased, hence, it will over the lifetime of a thread | |
208 // approximate the real stackbase. | |
209 address _highest_lock; // Highest stack address where a JavaLock exist | |
210 | |
211 ThreadLocalAllocBuffer _tlab; // Thread-local eden | |
212 | |
213 int _vm_operation_started_count; // VM_Operation support | |
214 int _vm_operation_completed_count; // VM_Operation support | |
215 | |
216 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread | |
217 // is waiting to lock | |
218 bool _current_pending_monitor_is_from_java; // locking is from Java code | |
219 | |
220 // ObjectMonitor on which this thread called Object.wait() | |
221 ObjectMonitor* _current_waiting_monitor; | |
222 | |
223 // Private thread-local objectmonitor list - a simple cache organized as a SLL. | |
224 public: | |
225 ObjectMonitor * omFreeList ; | |
226 int omFreeCount ; // length of omFreeList | |
227 int omFreeProvision ; // reload chunk size | |
228 | |
229 public: | |
230 enum { | |
231 is_definitely_current_thread = true | |
232 }; | |
233 | |
234 // Constructor | |
235 Thread(); | |
236 virtual ~Thread(); | |
237 | |
238 // initializtion | |
239 void initialize_thread_local_storage(); | |
240 | |
241 // thread entry point | |
242 virtual void run(); | |
243 | |
244 // Testers | |
245 virtual bool is_VM_thread() const { return false; } | |
246 virtual bool is_Java_thread() const { return false; } | |
247 // Remove this ifdef when C1 is ported to the compiler interface. | |
248 virtual bool is_Compiler_thread() const { return false; } | |
249 virtual bool is_hidden_from_external_view() const { return false; } | |
250 virtual bool is_jvmti_agent_thread() const { return false; } | |
251 // True iff the thread can perform GC operations at a safepoint. | |
252 // Generally will be true only of VM thread and parallel GC WorkGang | |
253 // threads. | |
254 virtual bool is_GC_task_thread() const { return false; } | |
255 virtual bool is_Watcher_thread() const { return false; } | |
256 virtual bool is_ConcurrentGC_thread() const { return false; } | |
257 | |
258 virtual char* name() const { return (char*)"Unknown thread"; } | |
259 | |
260 // Returns the current thread | |
261 static inline Thread* current(); | |
262 | |
263 // Common thread operations | |
264 static void set_priority(Thread* thread, ThreadPriority priority); | |
265 static ThreadPriority get_priority(const Thread* const thread); | |
266 static void start(Thread* thread); | |
267 static void interrupt(Thread* thr); | |
268 static bool is_interrupted(Thread* thr, bool clear_interrupted); | |
269 | |
270 Monitor* SR_lock() const { return _SR_lock; } | |
271 | |
272 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } | |
273 | |
274 void set_suspend_flag(SuspendFlags f) { | |
275 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
276 uint32_t flags; | |
277 do { | |
278 flags = _suspend_flags; | |
279 } | |
280 while (Atomic::cmpxchg((jint)(flags | f), | |
281 (volatile jint*)&_suspend_flags, | |
282 (jint)flags) != (jint)flags); | |
283 } | |
284 void clear_suspend_flag(SuspendFlags f) { | |
285 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
286 uint32_t flags; | |
287 do { | |
288 flags = _suspend_flags; | |
289 } | |
290 while (Atomic::cmpxchg((jint)(flags & ~f), | |
291 (volatile jint*)&_suspend_flags, | |
292 (jint)flags) != (jint)flags); | |
293 } | |
294 | |
295 void set_has_async_exception() { | |
296 set_suspend_flag(_has_async_exception); | |
297 } | |
298 void clear_has_async_exception() { | |
299 clear_suspend_flag(_has_async_exception); | |
300 } | |
301 | |
302 // Support for Unhandled Oop detection | |
303 #ifdef CHECK_UNHANDLED_OOPS | |
304 private: | |
305 UnhandledOops *_unhandled_oops; | |
306 public: | |
307 UnhandledOops* unhandled_oops() { return _unhandled_oops; } | |
308 // Mark oop safe for gc. It may be stack allocated but won't move. | |
309 void allow_unhandled_oop(oop *op) { | |
310 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); | |
311 } | |
312 // Clear oops at safepoint so crashes point to unhandled oop violator | |
313 void clear_unhandled_oops() { | |
314 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); | |
315 } | |
316 bool is_gc_locked_out() { return _gc_locked_out_count > 0; } | |
317 #endif // CHECK_UNHANDLED_OOPS | |
318 | |
319 public: | |
320 // Installs a pending exception to be inserted later | |
321 static void send_async_exception(oop thread_oop, oop java_throwable); | |
322 | |
323 // Resource area | |
324 ResourceArea* resource_area() const { return _resource_area; } | |
325 void set_resource_area(ResourceArea* area) { _resource_area = area; } | |
326 | |
327 OSThread* osthread() const { return _osthread; } | |
328 void set_osthread(OSThread* thread) { _osthread = thread; } | |
329 | |
330 // JNI handle support | |
331 JNIHandleBlock* active_handles() const { return _active_handles; } | |
332 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } | |
333 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } | |
334 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } | |
335 | |
336 // Internal handle support | |
337 HandleArea* handle_area() const { return _handle_area; } | |
338 void set_handle_area(HandleArea* area) { _handle_area = area; } | |
339 | |
340 // Thread-Local Allocation Buffer (TLAB) support | |
341 ThreadLocalAllocBuffer& tlab() { return _tlab; } | |
342 void initialize_tlab() { | |
343 if (UseTLAB) { | |
344 tlab().initialize(); | |
345 } | |
346 } | |
347 | |
348 // VM operation support | |
349 int vm_operation_ticket() { return ++_vm_operation_started_count; } | |
350 int vm_operation_completed_count() { return _vm_operation_completed_count; } | |
351 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } | |
352 | |
353 // For tracking the heavyweight monitor the thread is pending on. | |
354 ObjectMonitor* current_pending_monitor() { | |
355 return _current_pending_monitor; | |
356 } | |
357 void set_current_pending_monitor(ObjectMonitor* monitor) { | |
358 _current_pending_monitor = monitor; | |
359 } | |
360 void set_current_pending_monitor_is_from_java(bool from_java) { | |
361 _current_pending_monitor_is_from_java = from_java; | |
362 } | |
363 bool current_pending_monitor_is_from_java() { | |
364 return _current_pending_monitor_is_from_java; | |
365 } | |
366 | |
367 // For tracking the ObjectMonitor on which this thread called Object.wait() | |
368 ObjectMonitor* current_waiting_monitor() { | |
369 return _current_waiting_monitor; | |
370 } | |
371 void set_current_waiting_monitor(ObjectMonitor* monitor) { | |
372 _current_waiting_monitor = monitor; | |
373 } | |
374 | |
375 // GC support | |
376 // Apply "f->do_oop" to all root oops in "this". | |
377 void oops_do(OopClosure* f); | |
378 | |
379 // Handles the parallel case for the method below. | |
380 private: | |
381 bool claim_oops_do_par_case(int collection_parity); | |
382 public: | |
383 // Requires that "collection_parity" is that of the current strong roots | |
384 // iteration. If "is_par" is false, sets the parity of "this" to | |
385 // "collection_parity", and returns "true". If "is_par" is true, | |
386 // uses an atomic instruction to set the current threads parity to | |
387 // "collection_parity", if it is not already. Returns "true" iff the | |
388 // calling thread does the update, this indicates that the calling thread | |
389 // has claimed the thread's stack as a root groop in the current | |
390 // collection. | |
391 bool claim_oops_do(bool is_par, int collection_parity) { | |
392 if (!is_par) { | |
393 _oops_do_parity = collection_parity; | |
394 return true; | |
395 } else { | |
396 return claim_oops_do_par_case(collection_parity); | |
397 } | |
398 } | |
399 | |
400 // Sweeper support | |
401 void nmethods_do(); | |
402 | |
403 // Fast-locking support | |
404 address highest_lock() const { return _highest_lock; } | |
405 void update_highest_lock(address base) { if (base > _highest_lock) _highest_lock = base; } | |
406 | |
407 // Tells if adr belong to this thread. This is used | |
408 // for checking if a lock is owned by the running thread. | |
409 // Warning: the method can only be used on the running thread | |
410 // Fast lock support uses these methods | |
411 virtual bool lock_is_in_stack(address adr) const; | |
412 virtual bool is_lock_owned(address adr) const; | |
413 | |
414 // Check if address is in the stack of the thread (not just for locks). | |
415 bool is_in_stack(address adr) const; | |
416 | |
417 // Sets this thread as starting thread. Returns failure if thread | |
418 // creation fails due to lack of memory, too many threads etc. | |
419 bool set_as_starting_thread(); | |
420 | |
421 protected: | |
422 // OS data associated with the thread | |
423 OSThread* _osthread; // Platform-specific thread information | |
424 | |
425 // Thread local resource area for temporary allocation within the VM | |
426 ResourceArea* _resource_area; | |
427 | |
428 // Thread local handle area for allocation of handles within the VM | |
429 HandleArea* _handle_area; | |
430 | |
431 // Support for stack overflow handling, get_thread, etc. | |
432 address _stack_base; | |
433 size_t _stack_size; | |
434 uintptr_t _self_raw_id; // used by get_thread (mutable) | |
435 int _lgrp_id; | |
436 | |
437 public: | |
438 // Stack overflow support | |
439 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } | |
440 | |
441 void set_stack_base(address base) { _stack_base = base; } | |
442 size_t stack_size() const { return _stack_size; } | |
443 void set_stack_size(size_t size) { _stack_size = size; } | |
444 void record_stack_base_and_size(); | |
445 | |
446 int lgrp_id() const { return _lgrp_id; } | |
447 void set_lgrp_id(int value) { _lgrp_id = value; } | |
448 | |
449 // Printing | |
450 void print_on(outputStream* st) const; | |
451 void print() const { print_on(tty); } | |
452 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; | |
453 | |
454 // Debug-only code | |
455 | |
456 #ifdef ASSERT | |
457 private: | |
458 // Deadlock detection support for Mutex locks. List of locks own by thread. | |
459 Monitor *_owned_locks; | |
460 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, | |
461 // thus the friendship | |
462 friend class Mutex; | |
463 friend class Monitor; | |
464 | |
465 public: | |
466 void print_owned_locks_on(outputStream* st) const; | |
467 void print_owned_locks() const { print_owned_locks_on(tty); } | |
468 Monitor * owned_locks() const { return _owned_locks; } | |
469 bool owns_locks() const { return owned_locks() != NULL; } | |
470 bool owns_locks_but_compiled_lock() const; | |
471 | |
472 // Deadlock detection | |
473 bool allow_allocation() { return _allow_allocation_count == 0; } | |
474 #endif | |
475 | |
476 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; | |
477 | |
478 private: | |
479 volatile int _jvmti_env_iteration_count; | |
480 | |
481 public: | |
482 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } | |
483 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } | |
484 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } | |
485 | |
486 // Code generation | |
487 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } | |
488 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } | |
489 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } | |
490 | |
491 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } | |
492 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } | |
493 static ByteSize omFreeList_offset() { return byte_offset_of(Thread, omFreeList); } | |
494 | |
495 #define TLAB_FIELD_OFFSET(name) \ | |
496 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } | |
497 | |
498 TLAB_FIELD_OFFSET(start) | |
499 TLAB_FIELD_OFFSET(end) | |
500 TLAB_FIELD_OFFSET(top) | |
501 TLAB_FIELD_OFFSET(pf_top) | |
502 TLAB_FIELD_OFFSET(size) // desired_size | |
503 TLAB_FIELD_OFFSET(refill_waste_limit) | |
504 TLAB_FIELD_OFFSET(number_of_refills) | |
505 TLAB_FIELD_OFFSET(fast_refill_waste) | |
506 TLAB_FIELD_OFFSET(slow_allocations) | |
507 | |
508 #undef TLAB_FIELD_OFFSET | |
509 | |
510 public: | |
511 volatile intptr_t _Stalled ; | |
512 volatile int _TypeTag ; | |
513 ParkEvent * _ParkEvent ; // for synchronized() | |
514 ParkEvent * _SleepEvent ; // for Thread.sleep | |
515 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor | |
516 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease | |
517 int NativeSyncRecursion ; // diagnostic | |
518 | |
519 volatile int _OnTrap ; // Resume-at IP delta | |
520 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG | |
521 jint _hashStateX ; // thread-specific hashCode generator state | |
522 jint _hashStateY ; | |
523 jint _hashStateZ ; | |
524 void * _schedctl ; | |
525 | |
526 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code | |
527 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); } | |
528 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); } | |
529 | |
530 volatile jint rng [4] ; // RNG for spin loop | |
531 | |
532 // Low-level leaf-lock primitives used to implement synchronization | |
533 // and native monitor-mutex infrastructure. | |
534 // Not for general synchronization use. | |
535 static void SpinAcquire (volatile int * Lock, const char * Name) ; | |
536 static void SpinRelease (volatile int * Lock) ; | |
537 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; | |
538 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; | |
539 static void muxRelease (volatile intptr_t * Lock) ; | |
540 | |
541 }; | |
542 | |
543 // Inline implementation of Thread::current() | |
544 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of | |
545 // startup. | |
546 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same | |
547 // period. This is inlined in thread_<os_family>.inline.hpp. | |
548 | |
549 inline Thread* Thread::current() { | |
550 #ifdef ASSERT | |
551 // This function is very high traffic. Define PARANOID to enable expensive | |
552 // asserts. | |
553 #ifdef PARANOID | |
554 // Signal handler should call ThreadLocalStorage::get_thread_slow() | |
555 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
556 assert(t != NULL && !t->is_inside_signal_handler(), | |
557 "Don't use Thread::current() inside signal handler"); | |
558 #endif | |
559 #endif | |
560 Thread* thread = ThreadLocalStorage::thread(); | |
561 assert(thread != NULL, "just checking"); | |
562 return thread; | |
563 } | |
564 | |
565 // Name support for threads. non-JavaThread subclasses with multiple | |
566 // uniquely named instances should derive from this. | |
567 class NamedThread: public Thread { | |
568 friend class VMStructs; | |
569 enum { | |
570 max_name_len = 64 | |
571 }; | |
572 private: | |
573 char* _name; | |
574 public: | |
575 NamedThread(); | |
576 ~NamedThread(); | |
577 // May only be called once per thread. | |
578 void set_name(const char* format, ...); | |
579 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } | |
580 }; | |
581 | |
582 // Worker threads are named and have an id of an assigned work. | |
583 class WorkerThread: public NamedThread { | |
584 private: | |
585 uint _id; | |
586 public: | |
587 WorkerThread() : _id(0) { } | |
588 void set_id(uint work_id) { _id = work_id; } | |
589 uint id() const { return _id; } | |
590 }; | |
591 | |
592 // A single WatcherThread is used for simulating timer interrupts. | |
593 class WatcherThread: public Thread { | |
594 friend class VMStructs; | |
595 public: | |
596 virtual void run(); | |
597 | |
598 private: | |
599 static WatcherThread* _watcher_thread; | |
600 | |
601 static bool _should_terminate; | |
602 public: | |
603 enum SomeConstants { | |
604 delay_interval = 10 // interrupt delay in milliseconds | |
605 }; | |
606 | |
607 // Constructor | |
608 WatcherThread(); | |
609 | |
610 // Tester | |
611 bool is_Watcher_thread() const { return true; } | |
612 | |
613 // Printing | |
614 char* name() const { return (char*)"VM Periodic Task Thread"; } | |
615 void print_on(outputStream* st) const; | |
616 void print() const { print_on(tty); } | |
617 | |
618 // Returns the single instance of WatcherThread | |
619 static WatcherThread* watcher_thread() { return _watcher_thread; } | |
620 | |
621 // Create and start the single instance of WatcherThread, or stop it on shutdown | |
622 static void start(); | |
623 static void stop(); | |
624 }; | |
625 | |
626 | |
627 class CompilerThread; | |
628 | |
629 typedef void (*ThreadFunction)(JavaThread*, TRAPS); | |
630 | |
631 class JavaThread: public Thread { | |
632 friend class VMStructs; | |
633 private: | |
634 JavaThread* _next; // The next thread in the Threads list | |
635 oop _threadObj; // The Java level thread object | |
636 | |
637 #ifdef ASSERT | |
638 private: | |
639 int _java_call_counter; | |
640 | |
641 public: | |
642 int java_call_counter() { return _java_call_counter; } | |
643 void inc_java_call_counter() { _java_call_counter++; } | |
644 void dec_java_call_counter() { | |
645 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); | |
646 _java_call_counter--; | |
647 } | |
648 private: // restore original namespace restriction | |
649 #endif // ifdef ASSERT | |
650 | |
651 #ifndef PRODUCT | |
652 public: | |
653 enum { | |
654 jump_ring_buffer_size = 16 | |
655 }; | |
656 private: // restore original namespace restriction | |
657 #endif | |
658 | |
659 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state | |
660 | |
661 ThreadFunction _entry_point; | |
662 | |
663 JNIEnv _jni_environment; | |
664 | |
665 // Deopt support | |
666 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization | |
667 | |
668 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we | |
669 // transition out of native | |
670 | |
671 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays | |
672 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped | |
673 // Because deoptimization is lazy we must save jvmti requests to set locals | |
674 // in compiled frames until we deoptimize and we have an interpreter frame. | |
675 // This holds the pointer to array (yeah like there might be more than one) of | |
676 // description of compiled vframes that have locals that need to be updated. | |
677 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; | |
678 | |
679 // Handshake value for fixing 6243940. We need a place for the i2c | |
680 // adapter to store the callee methodOop. This value is NEVER live | |
681 // across a gc point so it does NOT have to be gc'd | |
682 // The handshake is open ended since we can't be certain that it will | |
683 // be NULLed. This is because we rarely ever see the race and end up | |
684 // in handle_wrong_method which is the backend of the handshake. See | |
685 // code in i2c adapters and handle_wrong_method. | |
686 | |
687 methodOop _callee_target; | |
688 | |
689 // Oop results of VM runtime calls | |
690 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved | |
691 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved | |
692 | |
693 MonitorChunk* _monitor_chunks; // Contains the off stack monitors | |
694 // allocated during deoptimization | |
695 // and by JNI_MonitorEnter/Exit | |
696 | |
697 // Async. requests support | |
698 enum AsyncRequests { | |
699 _no_async_condition = 0, | |
700 _async_exception, | |
701 _async_unsafe_access_error | |
702 }; | |
703 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request | |
704 oop _pending_async_exception; | |
705 | |
706 // Safepoint support | |
707 public: // Expose _thread_state for SafeFetchInt() | |
708 volatile JavaThreadState _thread_state; | |
709 private: | |
710 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint | |
711 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened | |
712 | |
713 // JavaThread termination support | |
714 enum TerminatedTypes { | |
715 _not_terminated = 0xDEAD - 2, | |
716 _thread_exiting, // JavaThread::exit() has been called for this thread | |
717 _thread_terminated, // JavaThread is removed from thread list | |
718 _vm_exited // JavaThread is still executing native code, but VM is terminated | |
719 // only VM_Exit can set _vm_exited | |
720 }; | |
721 | |
722 // In general a JavaThread's _terminated field transitions as follows: | |
723 // | |
724 // _not_terminated => _thread_exiting => _thread_terminated | |
725 // | |
726 // _vm_exited is a special value to cover the case of a JavaThread | |
727 // executing native code after the VM itself is terminated. | |
728 TerminatedTypes _terminated; | |
729 // suspend/resume support | |
730 volatile bool _suspend_equivalent; // Suspend equivalent condition | |
731 jint _in_deopt_handler; // count of deoptimization | |
732 // handlers thread is in | |
733 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access | |
734 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was | |
735 // never locked) when throwing an exception. Used by interpreter only. | |
736 | |
737 // Flag to mark a JNI thread in the process of attaching - See CR 6404306 | |
738 // This flag is never set true other than at construction, and in that case | |
739 // is shortly thereafter set false | |
740 volatile bool _is_attaching; | |
741 | |
742 public: | |
743 // State of the stack guard pages for this thread. | |
744 enum StackGuardState { | |
745 stack_guard_unused, // not needed | |
746 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow | |
747 stack_guard_enabled // enabled | |
748 }; | |
749 | |
750 private: | |
751 | |
752 StackGuardState _stack_guard_state; | |
753 | |
754 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is | |
755 // used to temp. parsing values into and out of the runtime system during exception handling for compiled | |
756 // code) | |
757 volatile oop _exception_oop; // Exception thrown in compiled code | |
758 volatile address _exception_pc; // PC where exception happened | |
759 volatile address _exception_handler_pc; // PC for handler of exception | |
760 volatile int _exception_stack_size; // Size of frame where exception happened | |
761 | |
762 // support for compilation | |
763 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible) | |
764 | |
765 // support for JNI critical regions | |
766 jint _jni_active_critical; // count of entries into JNI critical region | |
767 | |
768 // For deadlock detection. | |
769 int _depth_first_number; | |
770 | |
771 // JVMTI PopFrame support | |
772 // This is set to popframe_pending to signal that top Java frame should be popped immediately | |
773 int _popframe_condition; | |
774 | |
775 #ifndef PRODUCT | |
776 int _jmp_ring_index; | |
777 struct { | |
778 // We use intptr_t instead of address so debugger doesn't try and display strings | |
779 intptr_t _target; | |
780 intptr_t _instruction; | |
781 const char* _file; | |
782 int _line; | |
783 } _jmp_ring[ jump_ring_buffer_size ]; | |
784 #endif /* PRODUCT */ | |
785 | |
342 | 786 #ifndef SERIALGC |
787 // Support for G1 barriers | |
788 | |
789 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. | |
790 // Set of all such queues. | |
791 static SATBMarkQueueSet _satb_mark_queue_set; | |
792 | |
793 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. | |
794 // Set of all such queues. | |
795 static DirtyCardQueueSet _dirty_card_queue_set; | |
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797 void flush_barrier_queues(); |
342 | 798 #endif // !SERIALGC |
799 | |
0 | 800 friend class VMThread; |
801 friend class ThreadWaitTransition; | |
802 friend class VM_Exit; | |
803 | |
804 void initialize(); // Initialized the instance variables | |
805 | |
806 public: | |
807 // Constructor | |
808 JavaThread(bool is_attaching = false); // for main thread and JNI attached threads | |
809 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); | |
810 ~JavaThread(); | |
811 | |
812 #ifdef ASSERT | |
813 // verify this JavaThread hasn't be published in the Threads::list yet | |
814 void verify_not_published(); | |
815 #endif | |
816 | |
817 //JNI functiontable getter/setter for JVMTI jni function table interception API. | |
818 void set_jni_functions(struct JNINativeInterface_* functionTable) { | |
819 _jni_environment.functions = functionTable; | |
820 } | |
821 struct JNINativeInterface_* get_jni_functions() { | |
822 return (struct JNINativeInterface_ *)_jni_environment.functions; | |
823 } | |
824 | |
825 // Executes Shutdown.shutdown() | |
826 void invoke_shutdown_hooks(); | |
827 | |
828 // Cleanup on thread exit | |
829 enum ExitType { | |
830 normal_exit, | |
831 jni_detach | |
832 }; | |
833 void exit(bool destroy_vm, ExitType exit_type = normal_exit); | |
834 | |
835 void cleanup_failed_attach_current_thread(); | |
836 | |
837 // Testers | |
838 virtual bool is_Java_thread() const { return true; } | |
839 | |
840 // compilation | |
841 void set_is_compiling(bool f) { _is_compiling = f; } | |
842 bool is_compiling() const { return _is_compiling; } | |
843 | |
844 // Thread chain operations | |
845 JavaThread* next() const { return _next; } | |
846 void set_next(JavaThread* p) { _next = p; } | |
847 | |
848 // Thread oop. threadObj() can be NULL for initial JavaThread | |
849 // (or for threads attached via JNI) | |
850 oop threadObj() const { return _threadObj; } | |
851 void set_threadObj(oop p) { _threadObj = p; } | |
852 | |
853 ThreadPriority java_priority() const; // Read from threadObj() | |
854 | |
855 // Prepare thread and add to priority queue. If a priority is | |
856 // not specified, use the priority of the thread object. Threads_lock | |
857 // must be held while this function is called. | |
858 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); | |
859 | |
860 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } | |
861 address saved_exception_pc() { return _saved_exception_pc; } | |
862 | |
863 | |
864 ThreadFunction entry_point() const { return _entry_point; } | |
865 | |
866 // Allocates a new Java level thread object for this thread. thread_name may be NULL. | |
867 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); | |
868 | |
869 // Last frame anchor routines | |
870 | |
871 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } | |
872 | |
873 // last_Java_sp | |
874 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } | |
875 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } | |
876 | |
877 // last_Java_pc | |
878 | |
879 address last_Java_pc(void) { return _anchor.last_Java_pc(); } | |
880 | |
881 // Safepoint support | |
882 JavaThreadState thread_state() const { return _thread_state; } | |
883 void set_thread_state(JavaThreadState s) { _thread_state=s; } | |
884 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } | |
885 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } | |
886 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } | |
887 | |
888 // thread has called JavaThread::exit() or is terminated | |
889 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } | |
890 // thread is terminated (no longer on the threads list); we compare | |
891 // against the two non-terminated values so that a freed JavaThread | |
892 // will also be considered terminated. | |
893 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } | |
894 void set_terminated(TerminatedTypes t) { _terminated = t; } | |
895 // special for Threads::remove() which is static: | |
896 void set_terminated_value() { _terminated = _thread_terminated; } | |
897 void block_if_vm_exited(); | |
898 | |
899 bool doing_unsafe_access() { return _doing_unsafe_access; } | |
900 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } | |
901 | |
902 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } | |
903 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } | |
904 | |
905 | |
906 // Suspend/resume support for JavaThread | |
907 | |
908 private: | |
909 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } | |
910 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } | |
911 | |
912 public: | |
913 void java_suspend(); | |
914 void java_resume(); | |
915 int java_suspend_self(); | |
916 | |
917 void check_and_wait_while_suspended() { | |
918 assert(JavaThread::current() == this, "sanity check"); | |
919 | |
920 bool do_self_suspend; | |
921 do { | |
922 // were we externally suspended while we were waiting? | |
923 do_self_suspend = handle_special_suspend_equivalent_condition(); | |
924 if (do_self_suspend) { | |
925 // don't surprise the thread that suspended us by returning | |
926 java_suspend_self(); | |
927 set_suspend_equivalent(); | |
928 } | |
929 } while (do_self_suspend); | |
930 } | |
931 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); | |
932 // Check for async exception in addition to safepoint and suspend request. | |
933 static void check_special_condition_for_native_trans(JavaThread *thread); | |
934 | |
935 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); | |
936 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { | |
937 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
938 // Warning: is_ext_suspend_completed() may temporarily drop the | |
939 // SR_lock to allow the thread to reach a stable thread state if | |
940 // it is currently in a transient thread state. | |
941 return is_ext_suspend_completed(false /*!called_by_wait */, | |
942 SuspendRetryDelay, bits); | |
943 } | |
944 | |
945 // We cannot allow wait_for_ext_suspend_completion() to run forever or | |
946 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally | |
947 // passed as the count and delay parameters. Experiments with specific | |
948 // calls to wait_for_ext_suspend_completion() can be done by passing | |
949 // other values in the code. Experiments with all calls can be done | |
950 // via the appropriate -XX options. | |
951 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); | |
952 | |
953 void set_external_suspend() { set_suspend_flag (_external_suspend); } | |
954 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } | |
955 | |
956 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } | |
957 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } | |
958 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } | |
959 | |
960 bool is_external_suspend() const { | |
961 return (_suspend_flags & _external_suspend) != 0; | |
962 } | |
963 // Whenever a thread transitions from native to vm/java it must suspend | |
964 // if external|deopt suspend is present. | |
965 bool is_suspend_after_native() const { | |
966 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; | |
967 } | |
968 | |
969 // external suspend request is completed | |
970 bool is_ext_suspended() const { | |
971 return (_suspend_flags & _ext_suspended) != 0; | |
972 } | |
973 | |
974 // legacy method that checked for either external suspension or vm suspension | |
975 bool is_any_suspended() const { | |
976 return is_ext_suspended(); | |
977 } | |
978 | |
979 bool is_external_suspend_with_lock() const { | |
980 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
981 return is_external_suspend(); | |
982 } | |
983 | |
984 // Special method to handle a pending external suspend request | |
985 // when a suspend equivalent condition lifts. | |
986 bool handle_special_suspend_equivalent_condition() { | |
987 assert(is_suspend_equivalent(), | |
988 "should only be called in a suspend equivalence condition"); | |
989 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
990 bool ret = is_external_suspend(); | |
991 if (!ret) { | |
992 // not about to self-suspend so clear suspend equivalence | |
993 clear_suspend_equivalent(); | |
994 } | |
995 // implied else: | |
996 // We have a pending external suspend request so we leave the | |
997 // suspend_equivalent flag set until java_suspend_self() sets | |
998 // the ext_suspended flag and clears the suspend_equivalent | |
999 // flag. This insures that wait_for_ext_suspend_completion() | |
1000 // will return consistent values. | |
1001 return ret; | |
1002 } | |
1003 | |
1004 bool is_any_suspended_with_lock() const { | |
1005 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1006 return is_any_suspended(); | |
1007 } | |
1008 // utility methods to see if we are doing some kind of suspension | |
1009 bool is_being_ext_suspended() const { | |
1010 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1011 return is_ext_suspended() || is_external_suspend(); | |
1012 } | |
1013 | |
1014 bool is_suspend_equivalent() const { return _suspend_equivalent; } | |
1015 | |
1016 void set_suspend_equivalent() { _suspend_equivalent = true; }; | |
1017 void clear_suspend_equivalent() { _suspend_equivalent = false; }; | |
1018 | |
1019 // Thread.stop support | |
1020 void send_thread_stop(oop throwable); | |
1021 AsyncRequests clear_special_runtime_exit_condition() { | |
1022 AsyncRequests x = _special_runtime_exit_condition; | |
1023 _special_runtime_exit_condition = _no_async_condition; | |
1024 return x; | |
1025 } | |
1026 | |
1027 // Are any async conditions present? | |
1028 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } | |
1029 | |
1030 void check_and_handle_async_exceptions(bool check_unsafe_error = true); | |
1031 | |
1032 // these next two are also used for self-suspension and async exception support | |
1033 void handle_special_runtime_exit_condition(bool check_asyncs = true); | |
1034 | |
1035 // Return true if JavaThread has an asynchronous condition or | |
1036 // if external suspension is requested. | |
1037 bool has_special_runtime_exit_condition() { | |
1038 // We call is_external_suspend() last since external suspend should | |
1039 // be less common. Because we don't use is_external_suspend_with_lock | |
1040 // it is possible that we won't see an asynchronous external suspend | |
1041 // request that has just gotten started, i.e., SR_lock grabbed but | |
1042 // _external_suspend field change either not made yet or not visible | |
1043 // yet. However, this is okay because the request is asynchronous and | |
1044 // we will see the new flag value the next time through. It's also | |
1045 // possible that the external suspend request is dropped after | |
1046 // we have checked is_external_suspend(), we will recheck its value | |
1047 // under SR_lock in java_suspend_self(). | |
1048 return (_special_runtime_exit_condition != _no_async_condition) || | |
1049 is_external_suspend() || is_deopt_suspend(); | |
1050 } | |
1051 | |
1052 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } | |
1053 | |
1054 void set_pending_async_exception(oop e) { | |
1055 _pending_async_exception = e; | |
1056 _special_runtime_exit_condition = _async_exception; | |
1057 set_has_async_exception(); | |
1058 } | |
1059 | |
1060 // Fast-locking support | |
1061 bool is_lock_owned(address adr) const; | |
1062 | |
1063 // Accessors for vframe array top | |
1064 // The linked list of vframe arrays are sorted on sp. This means when we | |
1065 // unpack the head must contain the vframe array to unpack. | |
1066 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } | |
1067 vframeArray* vframe_array_head() const { return _vframe_array_head; } | |
1068 | |
1069 // Side structure for defering update of java frame locals until deopt occurs | |
1070 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } | |
1071 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } | |
1072 | |
1073 // These only really exist to make debugging deopt problems simpler | |
1074 | |
1075 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } | |
1076 vframeArray* vframe_array_last() const { return _vframe_array_last; } | |
1077 | |
1078 // The special resourceMark used during deoptimization | |
1079 | |
1080 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } | |
1081 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } | |
1082 | |
1083 intptr_t* must_deopt_id() { return _must_deopt_id; } | |
1084 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } | |
1085 void clear_must_deopt_id() { _must_deopt_id = NULL; } | |
1086 | |
1087 methodOop callee_target() const { return _callee_target; } | |
1088 void set_callee_target (methodOop x) { _callee_target = x; } | |
1089 | |
1090 // Oop results of vm runtime calls | |
1091 oop vm_result() const { return _vm_result; } | |
1092 void set_vm_result (oop x) { _vm_result = x; } | |
1093 | |
1094 oop vm_result_2() const { return _vm_result_2; } | |
1095 void set_vm_result_2 (oop x) { _vm_result_2 = x; } | |
1096 | |
1097 // Exception handling for compiled methods | |
1098 oop exception_oop() const { return _exception_oop; } | |
1099 int exception_stack_size() const { return _exception_stack_size; } | |
1100 address exception_pc() const { return _exception_pc; } | |
1101 address exception_handler_pc() const { return _exception_handler_pc; } | |
1102 | |
1103 void set_exception_oop(oop o) { _exception_oop = o; } | |
1104 void set_exception_pc(address a) { _exception_pc = a; } | |
1105 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } | |
1106 void set_exception_stack_size(int size) { _exception_stack_size = size; } | |
1107 | |
1108 // Stack overflow support | |
1109 inline size_t stack_available(address cur_sp); | |
1110 address stack_yellow_zone_base() | |
1111 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } | |
1112 size_t stack_yellow_zone_size() | |
1113 { return StackYellowPages * os::vm_page_size(); } | |
1114 address stack_red_zone_base() | |
1115 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } | |
1116 size_t stack_red_zone_size() | |
1117 { return StackRedPages * os::vm_page_size(); } | |
1118 bool in_stack_yellow_zone(address a) | |
1119 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } | |
1120 bool in_stack_red_zone(address a) | |
1121 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } | |
1122 | |
1123 void create_stack_guard_pages(); | |
1124 void remove_stack_guard_pages(); | |
1125 | |
1126 void enable_stack_yellow_zone(); | |
1127 void disable_stack_yellow_zone(); | |
1128 void enable_stack_red_zone(); | |
1129 void disable_stack_red_zone(); | |
1130 | |
1131 inline bool stack_yellow_zone_disabled(); | |
1132 inline bool stack_yellow_zone_enabled(); | |
1133 | |
1134 // Attempt to reguard the stack after a stack overflow may have occurred. | |
1135 // Returns true if (a) guard pages are not needed on this thread, (b) the | |
1136 // pages are already guarded, or (c) the pages were successfully reguarded. | |
1137 // Returns false if there is not enough stack space to reguard the pages, in | |
1138 // which case the caller should unwind a frame and try again. The argument | |
1139 // should be the caller's (approximate) sp. | |
1140 bool reguard_stack(address cur_sp); | |
1141 // Similar to above but see if current stackpoint is out of the guard area | |
1142 // and reguard if possible. | |
1143 bool reguard_stack(void); | |
1144 | |
1145 // Misc. accessors/mutators | |
1146 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } | |
1147 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } | |
1148 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } | |
1149 | |
1150 #ifndef PRODUCT | |
1151 void record_jump(address target, address instr, const char* file, int line); | |
1152 #endif /* PRODUCT */ | |
1153 | |
1154 // For assembly stub generation | |
1155 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } | |
1156 #ifndef PRODUCT | |
1157 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } | |
1158 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } | |
1159 #endif /* PRODUCT */ | |
1160 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } | |
1161 static ByteSize last_Java_sp_offset() { | |
1162 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); | |
1163 } | |
1164 static ByteSize last_Java_pc_offset() { | |
1165 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); | |
1166 } | |
1167 static ByteSize frame_anchor_offset() { | |
1168 return byte_offset_of(JavaThread, _anchor); | |
1169 } | |
1170 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } | |
1171 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } | |
1172 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } | |
1173 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } | |
1174 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } | |
1175 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } | |
1176 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } | |
1177 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } | |
1178 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } | |
1179 static ByteSize exception_stack_size_offset() { return byte_offset_of(JavaThread, _exception_stack_size); } | |
1180 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } | |
1181 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } | |
1182 | |
1183 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } | |
1184 | |
342 | 1185 #ifndef SERIALGC |
1186 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } | |
1187 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } | |
1188 #endif // !SERIALGC | |
1189 | |
0 | 1190 // Returns the jni environment for this thread |
1191 JNIEnv* jni_environment() { return &_jni_environment; } | |
1192 | |
1193 static JavaThread* thread_from_jni_environment(JNIEnv* env) { | |
1194 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); | |
1195 // Only return NULL if thread is off the thread list; starting to | |
1196 // exit should not return NULL. | |
1197 if (thread_from_jni_env->is_terminated()) { | |
1198 thread_from_jni_env->block_if_vm_exited(); | |
1199 return NULL; | |
1200 } else { | |
1201 return thread_from_jni_env; | |
1202 } | |
1203 } | |
1204 | |
1205 // JNI critical regions. These can nest. | |
1206 bool in_critical() { return _jni_active_critical > 0; } | |
1207 void enter_critical() { assert(Thread::current() == this, | |
1208 "this must be current thread"); | |
1209 _jni_active_critical++; } | |
1210 void exit_critical() { assert(Thread::current() == this, | |
1211 "this must be current thread"); | |
1212 _jni_active_critical--; | |
1213 assert(_jni_active_critical >= 0, | |
1214 "JNI critical nesting problem?"); } | |
1215 | |
1216 // For deadlock detection | |
1217 int depth_first_number() { return _depth_first_number; } | |
1218 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } | |
1219 | |
1220 private: | |
1221 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } | |
1222 | |
1223 public: | |
1224 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } | |
1225 void add_monitor_chunk(MonitorChunk* chunk); | |
1226 void remove_monitor_chunk(MonitorChunk* chunk); | |
1227 bool in_deopt_handler() const { return _in_deopt_handler > 0; } | |
1228 void inc_in_deopt_handler() { _in_deopt_handler++; } | |
1229 void dec_in_deopt_handler() { | |
1230 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); | |
1231 if (_in_deopt_handler > 0) { // robustness | |
1232 _in_deopt_handler--; | |
1233 } | |
1234 } | |
1235 | |
1236 private: | |
1237 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } | |
1238 | |
1239 public: | |
1240 | |
1241 // Frame iteration; calls the function f for all frames on the stack | |
1242 void frames_do(void f(frame*, const RegisterMap*)); | |
1243 | |
1244 // Memory operations | |
1245 void oops_do(OopClosure* f); | |
1246 | |
1247 // Sweeper operations | |
1248 void nmethods_do(); | |
1249 | |
1250 // Memory management operations | |
1251 void gc_epilogue(); | |
1252 void gc_prologue(); | |
1253 | |
1254 // Misc. operations | |
1255 char* name() const { return (char*)get_thread_name(); } | |
1256 void print_on(outputStream* st) const; | |
1257 void print() const { print_on(tty); } | |
1258 void print_value(); | |
1259 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; | |
1260 void print_thread_state() const PRODUCT_RETURN; | |
1261 void print_on_error(outputStream* st, char* buf, int buflen) const; | |
1262 void verify(); | |
1263 const char* get_thread_name() const; | |
1264 private: | |
1265 // factor out low-level mechanics for use in both normal and error cases | |
1266 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; | |
1267 public: | |
1268 const char* get_threadgroup_name() const; | |
1269 const char* get_parent_name() const; | |
1270 | |
1271 // Accessing frames | |
1272 frame last_frame() { | |
1273 _anchor.make_walkable(this); | |
1274 return pd_last_frame(); | |
1275 } | |
1276 javaVFrame* last_java_vframe(RegisterMap* reg_map); | |
1277 | |
1278 // Returns method at 'depth' java or native frames down the stack | |
1279 // Used for security checks | |
1280 klassOop security_get_caller_class(int depth); | |
1281 | |
1282 // Print stack trace in external format | |
1283 void print_stack_on(outputStream* st); | |
1284 void print_stack() { print_stack_on(tty); } | |
1285 | |
1286 // Print stack traces in various internal formats | |
1287 void trace_stack() PRODUCT_RETURN; | |
1288 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; | |
1289 void trace_frames() PRODUCT_RETURN; | |
1290 | |
1291 // Returns the number of stack frames on the stack | |
1292 int depth() const; | |
1293 | |
1294 // Function for testing deoptimization | |
1295 void deoptimize(); | |
1296 void make_zombies(); | |
1297 | |
1298 void deoptimized_wrt_marked_nmethods(); | |
1299 | |
1300 // Profiling operation (see fprofile.cpp) | |
1301 public: | |
1302 bool profile_last_Java_frame(frame* fr); | |
1303 | |
1304 private: | |
1305 ThreadProfiler* _thread_profiler; | |
1306 private: | |
1307 friend class FlatProfiler; // uses both [gs]et_thread_profiler. | |
1308 friend class FlatProfilerTask; // uses get_thread_profiler. | |
1309 friend class ThreadProfilerMark; // uses get_thread_profiler. | |
1310 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } | |
1311 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { | |
1312 ThreadProfiler* result = _thread_profiler; | |
1313 _thread_profiler = tp; | |
1314 return result; | |
1315 } | |
1316 | |
1317 // Static operations | |
1318 public: | |
1319 // Returns the running thread as a JavaThread | |
1320 static inline JavaThread* current(); | |
1321 | |
1322 // Returns the active Java thread. Do not use this if you know you are calling | |
1323 // from a JavaThread, as it's slower than JavaThread::current. If called from | |
1324 // the VMThread, it also returns the JavaThread that instigated the VMThread's | |
1325 // operation. You may not want that either. | |
1326 static JavaThread* active(); | |
1327 | |
1328 inline CompilerThread* as_CompilerThread(); | |
1329 | |
1330 public: | |
1331 virtual void run(); | |
1332 void thread_main_inner(); | |
1333 | |
1334 private: | |
1335 // PRIVILEGED STACK | |
1336 PrivilegedElement* _privileged_stack_top; | |
1337 GrowableArray<oop>* _array_for_gc; | |
1338 public: | |
1339 | |
1340 // Returns the privileged_stack information. | |
1341 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } | |
1342 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } | |
1343 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } | |
1344 | |
1345 public: | |
1346 // Thread local information maintained by JVMTI. | |
1347 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } | |
1348 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } | |
1349 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } | |
1350 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } | |
1351 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } | |
1352 | |
1353 // JVMTI PopFrame support | |
1354 // Setting and clearing popframe_condition | |
1355 // All of these enumerated values are bits. popframe_pending | |
1356 // indicates that a PopFrame() has been requested and not yet been | |
1357 // completed. popframe_processing indicates that that PopFrame() is in | |
1358 // the process of being completed. popframe_force_deopt_reexecution_bit | |
1359 // indicates that special handling is required when returning to a | |
1360 // deoptimized caller. | |
1361 enum PopCondition { | |
1362 popframe_inactive = 0x00, | |
1363 popframe_pending_bit = 0x01, | |
1364 popframe_processing_bit = 0x02, | |
1365 popframe_force_deopt_reexecution_bit = 0x04 | |
1366 }; | |
1367 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } | |
1368 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } | |
1369 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } | |
1370 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } | |
1371 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } | |
1372 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } | |
1373 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } | |
1374 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } | |
1375 #ifdef CC_INTERP | |
1376 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } | |
1377 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } | |
1378 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } | |
1379 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } | |
1380 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } | |
1381 #endif | |
1382 | |
1383 private: | |
1384 // Saved incoming arguments to popped frame. | |
1385 // Used only when popped interpreted frame returns to deoptimized frame. | |
1386 void* _popframe_preserved_args; | |
1387 int _popframe_preserved_args_size; | |
1388 | |
1389 public: | |
1390 void popframe_preserve_args(ByteSize size_in_bytes, void* start); | |
1391 void* popframe_preserved_args(); | |
1392 ByteSize popframe_preserved_args_size(); | |
1393 WordSize popframe_preserved_args_size_in_words(); | |
1394 void popframe_free_preserved_args(); | |
1395 | |
1396 | |
1397 private: | |
1398 JvmtiThreadState *_jvmti_thread_state; | |
1399 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; | |
1400 | |
1401 // Used by the interpreter in fullspeed mode for frame pop, method | |
1402 // entry, method exit and single stepping support. This field is | |
1403 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. | |
1404 // It can be set to zero asynchronously (i.e., without a VM operation | |
1405 // or a lock) so we have to be very careful. | |
1406 int _interp_only_mode; | |
1407 | |
1408 public: | |
1409 // used by the interpreter for fullspeed debugging support (see above) | |
1410 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } | |
1411 bool is_interp_only_mode() { return (_interp_only_mode != 0); } | |
1412 int get_interp_only_mode() { return _interp_only_mode; } | |
1413 void increment_interp_only_mode() { ++_interp_only_mode; } | |
1414 void decrement_interp_only_mode() { --_interp_only_mode; } | |
1415 | |
1416 private: | |
1417 ThreadStatistics *_thread_stat; | |
1418 | |
1419 public: | |
1420 ThreadStatistics* get_thread_stat() const { return _thread_stat; } | |
1421 | |
1422 // Return a blocker object for which this thread is blocked parking. | |
1423 oop current_park_blocker(); | |
1424 | |
1425 private: | |
1426 static size_t _stack_size_at_create; | |
1427 | |
1428 public: | |
1429 static inline size_t stack_size_at_create(void) { | |
1430 return _stack_size_at_create; | |
1431 } | |
1432 static inline void set_stack_size_at_create(size_t value) { | |
1433 _stack_size_at_create = value; | |
1434 } | |
1435 | |
342 | 1436 #ifndef SERIALGC |
1437 // SATB marking queue support | |
1438 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } | |
1439 static SATBMarkQueueSet& satb_mark_queue_set() { | |
1440 return _satb_mark_queue_set; | |
1441 } | |
1442 | |
1443 // Dirty card queue support | |
1444 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } | |
1445 static DirtyCardQueueSet& dirty_card_queue_set() { | |
1446 return _dirty_card_queue_set; | |
1447 } | |
1448 #endif // !SERIALGC | |
1449 | |
0 | 1450 // Machine dependent stuff |
1451 #include "incls/_thread_pd.hpp.incl" | |
1452 | |
1453 public: | |
1454 void set_blocked_on_compilation(bool value) { | |
1455 _blocked_on_compilation = value; | |
1456 } | |
1457 | |
1458 bool blocked_on_compilation() { | |
1459 return _blocked_on_compilation; | |
1460 } | |
1461 protected: | |
1462 bool _blocked_on_compilation; | |
1463 | |
1464 | |
1465 // JSR166 per-thread parker | |
1466 private: | |
1467 Parker* _parker; | |
1468 public: | |
1469 Parker* parker() { return _parker; } | |
1470 | |
1471 // Biased locking support | |
1472 private: | |
1473 GrowableArray<MonitorInfo*>* _cached_monitor_info; | |
1474 public: | |
1475 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } | |
1476 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } | |
1477 | |
1478 // clearing/querying jni attach status | |
1479 bool is_attaching() const { return _is_attaching; } | |
1480 void set_attached() { _is_attaching = false; OrderAccess::fence(); } | |
342 | 1481 private: |
1482 // This field is used to determine if a thread has claimed | |
1483 // a par_id: it is -1 if the thread has not claimed a par_id; | |
1484 // otherwise its value is the par_id that has been claimed. | |
1485 int _claimed_par_id; | |
1486 public: | |
1487 int get_claimed_par_id() { return _claimed_par_id; } | |
1488 void set_claimed_par_id(int id) { _claimed_par_id = id;} | |
0 | 1489 }; |
1490 | |
1491 // Inline implementation of JavaThread::current | |
1492 inline JavaThread* JavaThread::current() { | |
1493 Thread* thread = ThreadLocalStorage::thread(); | |
1494 assert(thread != NULL && thread->is_Java_thread(), "just checking"); | |
1495 return (JavaThread*)thread; | |
1496 } | |
1497 | |
1498 inline CompilerThread* JavaThread::as_CompilerThread() { | |
1499 assert(is_Compiler_thread(), "just checking"); | |
1500 return (CompilerThread*)this; | |
1501 } | |
1502 | |
1503 inline bool JavaThread::stack_yellow_zone_disabled() { | |
1504 return _stack_guard_state == stack_guard_yellow_disabled; | |
1505 } | |
1506 | |
1507 inline bool JavaThread::stack_yellow_zone_enabled() { | |
1508 #ifdef ASSERT | |
1509 if (os::uses_stack_guard_pages()) { | |
1510 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); | |
1511 } | |
1512 #endif | |
1513 return _stack_guard_state == stack_guard_enabled; | |
1514 } | |
1515 | |
1516 inline size_t JavaThread::stack_available(address cur_sp) { | |
1517 // This code assumes java stacks grow down | |
1518 address low_addr; // Limit on the address for deepest stack depth | |
1519 if ( _stack_guard_state == stack_guard_unused) { | |
1520 low_addr = stack_base() - stack_size(); | |
1521 } else { | |
1522 low_addr = stack_yellow_zone_base(); | |
1523 } | |
1524 return cur_sp > low_addr ? cur_sp - low_addr : 0; | |
1525 } | |
1526 | |
1527 // A JavaThread for low memory detection support | |
1528 class LowMemoryDetectorThread : public JavaThread { | |
1529 friend class VMStructs; | |
1530 public: | |
1531 LowMemoryDetectorThread(ThreadFunction entry_point) : JavaThread(entry_point) {}; | |
1532 | |
1533 // Hide this thread from external view. | |
1534 bool is_hidden_from_external_view() const { return true; } | |
1535 }; | |
1536 | |
1537 // A thread used for Compilation. | |
1538 class CompilerThread : public JavaThread { | |
1539 friend class VMStructs; | |
1540 private: | |
1541 CompilerCounters* _counters; | |
1542 | |
1543 ciEnv* _env; | |
1544 CompileLog* _log; | |
1545 CompileTask* _task; | |
1546 CompileQueue* _queue; | |
1547 | |
1548 public: | |
1549 | |
1550 static CompilerThread* current(); | |
1551 | |
1552 CompilerThread(CompileQueue* queue, CompilerCounters* counters); | |
1553 | |
1554 bool is_Compiler_thread() const { return true; } | |
1555 // Hide this compiler thread from external view. | |
1556 bool is_hidden_from_external_view() const { return true; } | |
1557 | |
1558 CompileQueue* queue() { return _queue; } | |
1559 CompilerCounters* counters() { return _counters; } | |
1560 | |
1561 // Get/set the thread's compilation environment. | |
1562 ciEnv* env() { return _env; } | |
1563 void set_env(ciEnv* env) { _env = env; } | |
1564 | |
1565 // Get/set the thread's logging information | |
1566 CompileLog* log() { return _log; } | |
1567 void init_log(CompileLog* log) { | |
1568 // Set once, for good. | |
1569 assert(_log == NULL, "set only once"); | |
1570 _log = log; | |
1571 } | |
1572 | |
1573 #ifndef PRODUCT | |
1574 private: | |
1575 IdealGraphPrinter *_ideal_graph_printer; | |
1576 public: | |
1577 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } | |
1578 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } | |
1579 #endif | |
1580 | |
1581 // Get/set the thread's current task | |
1582 CompileTask* task() { return _task; } | |
1583 void set_task(CompileTask* task) { _task = task; } | |
1584 }; | |
1585 | |
1586 inline CompilerThread* CompilerThread::current() { | |
1587 return JavaThread::current()->as_CompilerThread(); | |
1588 } | |
1589 | |
1590 | |
1591 // The active thread queue. It also keeps track of the current used | |
1592 // thread priorities. | |
1593 class Threads: AllStatic { | |
1594 friend class VMStructs; | |
1595 private: | |
1596 static JavaThread* _thread_list; | |
1597 static int _number_of_threads; | |
1598 static int _number_of_non_daemon_threads; | |
1599 static int _return_code; | |
1600 | |
1601 public: | |
1602 // Thread management | |
1603 // force_daemon is a concession to JNI, where we may need to add a | |
1604 // thread to the thread list before allocating its thread object | |
1605 static void add(JavaThread* p, bool force_daemon = false); | |
1606 static void remove(JavaThread* p); | |
1607 static bool includes(JavaThread* p); | |
1608 static JavaThread* first() { return _thread_list; } | |
1609 static void threads_do(ThreadClosure* tc); | |
1610 | |
1611 // Initializes the vm and creates the vm thread | |
1612 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); | |
1613 static void convert_vm_init_libraries_to_agents(); | |
1614 static void create_vm_init_libraries(); | |
1615 static void create_vm_init_agents(); | |
1616 static void shutdown_vm_agents(); | |
1617 static bool destroy_vm(); | |
1618 // Supported VM versions via JNI | |
1619 // Includes JNI_VERSION_1_1 | |
1620 static jboolean is_supported_jni_version_including_1_1(jint version); | |
1621 // Does not include JNI_VERSION_1_1 | |
1622 static jboolean is_supported_jni_version(jint version); | |
1623 | |
1624 // Garbage collection | |
1625 static void follow_other_roots(void f(oop*)); | |
1626 | |
1627 // Apply "f->do_oop" to all root oops in all threads. | |
1628 // This version may only be called by sequential code. | |
1629 static void oops_do(OopClosure* f); | |
1630 // This version may be called by sequential or parallel code. | |
1631 static void possibly_parallel_oops_do(OopClosure* f); | |
1632 // This creates a list of GCTasks, one per thread. | |
1633 static void create_thread_roots_tasks(GCTaskQueue* q); | |
1634 // This creates a list of GCTasks, one per thread, for marking objects. | |
1635 static void create_thread_roots_marking_tasks(GCTaskQueue* q); | |
1636 | |
1637 // Apply "f->do_oop" to roots in all threads that | |
1638 // are part of compiled frames | |
1639 static void compiled_frame_oops_do(OopClosure* f); | |
1640 | |
1641 static void convert_hcode_pointers(); | |
1642 static void restore_hcode_pointers(); | |
1643 | |
1644 // Sweeper | |
1645 static void nmethods_do(); | |
1646 | |
1647 static void gc_epilogue(); | |
1648 static void gc_prologue(); | |
1649 | |
1650 // Verification | |
1651 static void verify(); | |
1652 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); | |
1653 static void print(bool print_stacks, bool internal_format) { | |
1654 // this function is only used by debug.cpp | |
1655 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); | |
1656 } | |
1657 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); | |
1658 | |
1659 // Get Java threads that are waiting to enter a monitor. If doLock | |
1660 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
1661 // VM needs to be at a safepoint. | |
1662 static GrowableArray<JavaThread*>* get_pending_threads(int count, | |
1663 address monitor, bool doLock); | |
1664 | |
1665 // Get owning Java thread from the monitor's owner field. If doLock | |
1666 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
1667 // VM needs to be at a safepoint. | |
1668 static JavaThread *owning_thread_from_monitor_owner(address owner, | |
1669 bool doLock); | |
1670 | |
1671 // Number of threads on the active threads list | |
1672 static int number_of_threads() { return _number_of_threads; } | |
1673 // Number of non-daemon threads on the active threads list | |
1674 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } | |
1675 | |
1676 // Deoptimizes all frames tied to marked nmethods | |
1677 static void deoptimized_wrt_marked_nmethods(); | |
1678 | |
1679 }; | |
1680 | |
1681 | |
1682 // Thread iterator | |
1683 class ThreadClosure: public StackObj { | |
1684 public: | |
1685 virtual void do_thread(Thread* thread) = 0; | |
1686 }; | |
1687 | |
1688 class SignalHandlerMark: public StackObj { | |
1689 private: | |
1690 Thread* _thread; | |
1691 public: | |
1692 SignalHandlerMark(Thread* t) { | |
1693 _thread = t; | |
1694 if (_thread) _thread->enter_signal_handler(); | |
1695 } | |
1696 ~SignalHandlerMark() { | |
1697 if (_thread) _thread->leave_signal_handler(); | |
1698 _thread = NULL; | |
1699 } | |
1700 }; | |
1701 | |
1702 // ParkEvents are type-stable and immortal. | |
1703 // | |
1704 // Lifecycle: Once a ParkEvent is associated with a thread that ParkEvent remains | |
1705 // associated with the thread for the thread's entire lifetime - the relationship is | |
1706 // stable. A thread will be associated at most one ParkEvent. When the thread | |
1707 // expires, the ParkEvent moves to the EventFreeList. New threads attempt to allocate from | |
1708 // the EventFreeList before creating a new Event. Type-stability frees us from | |
1709 // worrying about stale Event or Thread references in the objectMonitor subsystem. | |
1710 // (A reference to ParkEvent is always valid, even though the event may no longer be associated | |
1711 // with the desired or expected thread. A key aspect of this design is that the callers of | |
1712 // park, unpark, etc must tolerate stale references and spurious wakeups). | |
1713 // | |
1714 // Only the "associated" thread can block (park) on the ParkEvent, although | |
1715 // any other thread can unpark a reachable parkevent. Park() is allowed to | |
1716 // return spuriously. In fact park-unpark a really just an optimization to | |
1717 // avoid unbounded spinning and surrender the CPU to be a polite system citizen. | |
1718 // A degenerate albeit "impolite" park-unpark implementation could simply return. | |
1719 // See http://blogs.sun.com/dave for more details. | |
1720 // | |
1721 // Eventually I'd like to eliminate Events and ObjectWaiters, both of which serve as | |
1722 // thread proxies, and simply make the THREAD structure type-stable and persistent. | |
1723 // Currently, we unpark events associated with threads, but ideally we'd just | |
1724 // unpark threads. | |
1725 // | |
1726 // The base-class, PlatformEvent, is platform-specific while the ParkEvent is | |
1727 // platform-independent. PlatformEvent provides park(), unpark(), etc., and | |
1728 // is abstract -- that is, a PlatformEvent should never be instantiated except | |
1729 // as part of a ParkEvent. | |
1730 // Equivalently we could have defined a platform-independent base-class that | |
1731 // exported Allocate(), Release(), etc. The platform-specific class would extend | |
1732 // that base-class, adding park(), unpark(), etc. | |
1733 // | |
1734 // A word of caution: The JVM uses 2 very similar constructs: | |
1735 // 1. ParkEvent are used for Java-level "monitor" synchronization. | |
1736 // 2. Parkers are used by JSR166-JUC park-unpark. | |
1737 // | |
1738 // We'll want to eventually merge these redundant facilities and use ParkEvent. | |
1739 | |
1740 | |
1741 class ParkEvent : public os::PlatformEvent { | |
1742 private: | |
1743 ParkEvent * FreeNext ; | |
1744 | |
1745 // Current association | |
1746 Thread * AssociatedWith ; | |
1747 intptr_t RawThreadIdentity ; // LWPID etc | |
1748 volatile int Incarnation ; | |
1749 | |
1750 // diagnostic : keep track of last thread to wake this thread. | |
1751 // this is useful for construction of dependency graphs. | |
1752 void * LastWaker ; | |
1753 | |
1754 public: | |
1755 // MCS-CLH list linkage and Native Mutex/Monitor | |
1756 ParkEvent * volatile ListNext ; | |
1757 ParkEvent * volatile ListPrev ; | |
1758 volatile intptr_t OnList ; | |
1759 volatile int TState ; | |
1760 volatile int Notified ; // for native monitor construct | |
1761 volatile int IsWaiting ; // Enqueued on WaitSet | |
1762 | |
1763 | |
1764 private: | |
1765 static ParkEvent * volatile FreeList ; | |
1766 static volatile int ListLock ; | |
1767 | |
1768 // It's prudent to mark the dtor as "private" | |
1769 // ensuring that it's not visible outside the package. | |
1770 // Unfortunately gcc warns about such usage, so | |
1771 // we revert to the less desirable "protected" visibility. | |
1772 // The other compilers accept private dtors. | |
1773 | |
1774 protected: // Ensure dtor is never invoked | |
1775 ~ParkEvent() { guarantee (0, "invariant") ; } | |
1776 | |
1777 ParkEvent() : PlatformEvent() { | |
1778 AssociatedWith = NULL ; | |
1779 FreeNext = NULL ; | |
1780 ListNext = NULL ; | |
1781 ListPrev = NULL ; | |
1782 OnList = 0 ; | |
1783 TState = 0 ; | |
1784 Notified = 0 ; | |
1785 IsWaiting = 0 ; | |
1786 } | |
1787 | |
1788 // We use placement-new to force ParkEvent instances to be | |
1789 // aligned on 256-byte address boundaries. This ensures that the least | |
1790 // significant byte of a ParkEvent address is always 0. | |
1791 | |
1792 void * operator new (size_t sz) ; | |
1793 void operator delete (void * a) ; | |
1794 | |
1795 public: | |
1796 static ParkEvent * Allocate (Thread * t) ; | |
1797 static void Release (ParkEvent * e) ; | |
1798 } ; |