Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/thread.hpp @ 702:b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
Summary: Remove usage of _highest_lock field in Thread so that is_lock_owned won't depend on the correct update of that field.
Reviewed-by: never, dice, acorn
author | xlu |
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date | Mon, 06 Apr 2009 15:47:39 -0700 |
parents | ea20d7ce26b0 |
children | 821269eca479 |
rev | line source |
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0 | 1 /* |
470 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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 ThreadLocalAllocBuffer _tlab; // Thread-local eden | |
204 | |
205 int _vm_operation_started_count; // VM_Operation support | |
206 int _vm_operation_completed_count; // VM_Operation support | |
207 | |
208 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread | |
209 // is waiting to lock | |
210 bool _current_pending_monitor_is_from_java; // locking is from Java code | |
211 | |
212 // ObjectMonitor on which this thread called Object.wait() | |
213 ObjectMonitor* _current_waiting_monitor; | |
214 | |
215 // Private thread-local objectmonitor list - a simple cache organized as a SLL. | |
216 public: | |
217 ObjectMonitor * omFreeList ; | |
218 int omFreeCount ; // length of omFreeList | |
219 int omFreeProvision ; // reload chunk size | |
220 | |
221 public: | |
222 enum { | |
223 is_definitely_current_thread = true | |
224 }; | |
225 | |
226 // Constructor | |
227 Thread(); | |
228 virtual ~Thread(); | |
229 | |
230 // initializtion | |
231 void initialize_thread_local_storage(); | |
232 | |
233 // thread entry point | |
234 virtual void run(); | |
235 | |
236 // Testers | |
237 virtual bool is_VM_thread() const { return false; } | |
238 virtual bool is_Java_thread() const { return false; } | |
239 // Remove this ifdef when C1 is ported to the compiler interface. | |
240 virtual bool is_Compiler_thread() const { return false; } | |
241 virtual bool is_hidden_from_external_view() const { return false; } | |
242 virtual bool is_jvmti_agent_thread() const { return false; } | |
243 // True iff the thread can perform GC operations at a safepoint. | |
244 // Generally will be true only of VM thread and parallel GC WorkGang | |
245 // threads. | |
246 virtual bool is_GC_task_thread() const { return false; } | |
247 virtual bool is_Watcher_thread() const { return false; } | |
248 virtual bool is_ConcurrentGC_thread() const { return false; } | |
249 | |
250 virtual char* name() const { return (char*)"Unknown thread"; } | |
251 | |
252 // Returns the current thread | |
253 static inline Thread* current(); | |
254 | |
255 // Common thread operations | |
256 static void set_priority(Thread* thread, ThreadPriority priority); | |
257 static ThreadPriority get_priority(const Thread* const thread); | |
258 static void start(Thread* thread); | |
259 static void interrupt(Thread* thr); | |
260 static bool is_interrupted(Thread* thr, bool clear_interrupted); | |
261 | |
262 Monitor* SR_lock() const { return _SR_lock; } | |
263 | |
264 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } | |
265 | |
266 void set_suspend_flag(SuspendFlags f) { | |
267 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
268 uint32_t flags; | |
269 do { | |
270 flags = _suspend_flags; | |
271 } | |
272 while (Atomic::cmpxchg((jint)(flags | f), | |
273 (volatile jint*)&_suspend_flags, | |
274 (jint)flags) != (jint)flags); | |
275 } | |
276 void clear_suspend_flag(SuspendFlags f) { | |
277 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
278 uint32_t flags; | |
279 do { | |
280 flags = _suspend_flags; | |
281 } | |
282 while (Atomic::cmpxchg((jint)(flags & ~f), | |
283 (volatile jint*)&_suspend_flags, | |
284 (jint)flags) != (jint)flags); | |
285 } | |
286 | |
287 void set_has_async_exception() { | |
288 set_suspend_flag(_has_async_exception); | |
289 } | |
290 void clear_has_async_exception() { | |
291 clear_suspend_flag(_has_async_exception); | |
292 } | |
293 | |
294 // Support for Unhandled Oop detection | |
295 #ifdef CHECK_UNHANDLED_OOPS | |
296 private: | |
297 UnhandledOops *_unhandled_oops; | |
298 public: | |
299 UnhandledOops* unhandled_oops() { return _unhandled_oops; } | |
300 // Mark oop safe for gc. It may be stack allocated but won't move. | |
301 void allow_unhandled_oop(oop *op) { | |
302 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); | |
303 } | |
304 // Clear oops at safepoint so crashes point to unhandled oop violator | |
305 void clear_unhandled_oops() { | |
306 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); | |
307 } | |
308 bool is_gc_locked_out() { return _gc_locked_out_count > 0; } | |
309 #endif // CHECK_UNHANDLED_OOPS | |
310 | |
311 public: | |
312 // Installs a pending exception to be inserted later | |
313 static void send_async_exception(oop thread_oop, oop java_throwable); | |
314 | |
315 // Resource area | |
316 ResourceArea* resource_area() const { return _resource_area; } | |
317 void set_resource_area(ResourceArea* area) { _resource_area = area; } | |
318 | |
319 OSThread* osthread() const { return _osthread; } | |
320 void set_osthread(OSThread* thread) { _osthread = thread; } | |
321 | |
322 // JNI handle support | |
323 JNIHandleBlock* active_handles() const { return _active_handles; } | |
324 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } | |
325 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } | |
326 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } | |
327 | |
328 // Internal handle support | |
329 HandleArea* handle_area() const { return _handle_area; } | |
330 void set_handle_area(HandleArea* area) { _handle_area = area; } | |
331 | |
332 // Thread-Local Allocation Buffer (TLAB) support | |
333 ThreadLocalAllocBuffer& tlab() { return _tlab; } | |
334 void initialize_tlab() { | |
335 if (UseTLAB) { | |
336 tlab().initialize(); | |
337 } | |
338 } | |
339 | |
340 // VM operation support | |
341 int vm_operation_ticket() { return ++_vm_operation_started_count; } | |
342 int vm_operation_completed_count() { return _vm_operation_completed_count; } | |
343 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } | |
344 | |
345 // For tracking the heavyweight monitor the thread is pending on. | |
346 ObjectMonitor* current_pending_monitor() { | |
347 return _current_pending_monitor; | |
348 } | |
349 void set_current_pending_monitor(ObjectMonitor* monitor) { | |
350 _current_pending_monitor = monitor; | |
351 } | |
352 void set_current_pending_monitor_is_from_java(bool from_java) { | |
353 _current_pending_monitor_is_from_java = from_java; | |
354 } | |
355 bool current_pending_monitor_is_from_java() { | |
356 return _current_pending_monitor_is_from_java; | |
357 } | |
358 | |
359 // For tracking the ObjectMonitor on which this thread called Object.wait() | |
360 ObjectMonitor* current_waiting_monitor() { | |
361 return _current_waiting_monitor; | |
362 } | |
363 void set_current_waiting_monitor(ObjectMonitor* monitor) { | |
364 _current_waiting_monitor = monitor; | |
365 } | |
366 | |
367 // GC support | |
368 // Apply "f->do_oop" to all root oops in "this". | |
369 void oops_do(OopClosure* f); | |
370 | |
371 // Handles the parallel case for the method below. | |
372 private: | |
373 bool claim_oops_do_par_case(int collection_parity); | |
374 public: | |
375 // Requires that "collection_parity" is that of the current strong roots | |
376 // iteration. If "is_par" is false, sets the parity of "this" to | |
377 // "collection_parity", and returns "true". If "is_par" is true, | |
378 // uses an atomic instruction to set the current threads parity to | |
379 // "collection_parity", if it is not already. Returns "true" iff the | |
380 // calling thread does the update, this indicates that the calling thread | |
381 // has claimed the thread's stack as a root groop in the current | |
382 // collection. | |
383 bool claim_oops_do(bool is_par, int collection_parity) { | |
384 if (!is_par) { | |
385 _oops_do_parity = collection_parity; | |
386 return true; | |
387 } else { | |
388 return claim_oops_do_par_case(collection_parity); | |
389 } | |
390 } | |
391 | |
392 // Sweeper support | |
393 void nmethods_do(); | |
394 | |
395 // Tells if adr belong to this thread. This is used | |
396 // for checking if a lock is owned by the running thread. | |
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6699669: Hotspot server leaves synchronized block with monitor in bad state
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398 // Used by fast lock support |
0 | 399 virtual bool is_lock_owned(address adr) const; |
400 | |
401 // Check if address is in the stack of the thread (not just for locks). | |
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402 // Warning: the method can only be used on the running thread |
0 | 403 bool is_in_stack(address adr) const; |
404 | |
405 // Sets this thread as starting thread. Returns failure if thread | |
406 // creation fails due to lack of memory, too many threads etc. | |
407 bool set_as_starting_thread(); | |
408 | |
409 protected: | |
410 // OS data associated with the thread | |
411 OSThread* _osthread; // Platform-specific thread information | |
412 | |
413 // Thread local resource area for temporary allocation within the VM | |
414 ResourceArea* _resource_area; | |
415 | |
416 // Thread local handle area for allocation of handles within the VM | |
417 HandleArea* _handle_area; | |
418 | |
419 // Support for stack overflow handling, get_thread, etc. | |
420 address _stack_base; | |
421 size_t _stack_size; | |
422 uintptr_t _self_raw_id; // used by get_thread (mutable) | |
423 int _lgrp_id; | |
424 | |
425 public: | |
426 // Stack overflow support | |
427 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } | |
428 | |
429 void set_stack_base(address base) { _stack_base = base; } | |
430 size_t stack_size() const { return _stack_size; } | |
431 void set_stack_size(size_t size) { _stack_size = size; } | |
432 void record_stack_base_and_size(); | |
433 | |
434 int lgrp_id() const { return _lgrp_id; } | |
435 void set_lgrp_id(int value) { _lgrp_id = value; } | |
436 | |
437 // Printing | |
438 void print_on(outputStream* st) const; | |
439 void print() const { print_on(tty); } | |
440 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; | |
441 | |
442 // Debug-only code | |
443 | |
444 #ifdef ASSERT | |
445 private: | |
446 // Deadlock detection support for Mutex locks. List of locks own by thread. | |
447 Monitor *_owned_locks; | |
448 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, | |
449 // thus the friendship | |
450 friend class Mutex; | |
451 friend class Monitor; | |
452 | |
453 public: | |
454 void print_owned_locks_on(outputStream* st) const; | |
455 void print_owned_locks() const { print_owned_locks_on(tty); } | |
456 Monitor * owned_locks() const { return _owned_locks; } | |
457 bool owns_locks() const { return owned_locks() != NULL; } | |
458 bool owns_locks_but_compiled_lock() const; | |
459 | |
460 // Deadlock detection | |
461 bool allow_allocation() { return _allow_allocation_count == 0; } | |
462 #endif | |
463 | |
464 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; | |
465 | |
466 private: | |
467 volatile int _jvmti_env_iteration_count; | |
468 | |
469 public: | |
470 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } | |
471 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } | |
472 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } | |
473 | |
474 // Code generation | |
475 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } | |
476 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } | |
477 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } | |
478 | |
479 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } | |
480 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } | |
481 static ByteSize omFreeList_offset() { return byte_offset_of(Thread, omFreeList); } | |
482 | |
483 #define TLAB_FIELD_OFFSET(name) \ | |
484 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } | |
485 | |
486 TLAB_FIELD_OFFSET(start) | |
487 TLAB_FIELD_OFFSET(end) | |
488 TLAB_FIELD_OFFSET(top) | |
489 TLAB_FIELD_OFFSET(pf_top) | |
490 TLAB_FIELD_OFFSET(size) // desired_size | |
491 TLAB_FIELD_OFFSET(refill_waste_limit) | |
492 TLAB_FIELD_OFFSET(number_of_refills) | |
493 TLAB_FIELD_OFFSET(fast_refill_waste) | |
494 TLAB_FIELD_OFFSET(slow_allocations) | |
495 | |
496 #undef TLAB_FIELD_OFFSET | |
497 | |
498 public: | |
499 volatile intptr_t _Stalled ; | |
500 volatile int _TypeTag ; | |
501 ParkEvent * _ParkEvent ; // for synchronized() | |
502 ParkEvent * _SleepEvent ; // for Thread.sleep | |
503 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor | |
504 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease | |
505 int NativeSyncRecursion ; // diagnostic | |
506 | |
507 volatile int _OnTrap ; // Resume-at IP delta | |
508 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG | |
509 jint _hashStateX ; // thread-specific hashCode generator state | |
510 jint _hashStateY ; | |
511 jint _hashStateZ ; | |
512 void * _schedctl ; | |
513 | |
514 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code | |
515 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); } | |
516 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); } | |
517 | |
518 volatile jint rng [4] ; // RNG for spin loop | |
519 | |
520 // Low-level leaf-lock primitives used to implement synchronization | |
521 // and native monitor-mutex infrastructure. | |
522 // Not for general synchronization use. | |
523 static void SpinAcquire (volatile int * Lock, const char * Name) ; | |
524 static void SpinRelease (volatile int * Lock) ; | |
525 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; | |
526 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; | |
527 static void muxRelease (volatile intptr_t * Lock) ; | |
528 | |
529 }; | |
530 | |
531 // Inline implementation of Thread::current() | |
532 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of | |
533 // startup. | |
534 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same | |
535 // period. This is inlined in thread_<os_family>.inline.hpp. | |
536 | |
537 inline Thread* Thread::current() { | |
538 #ifdef ASSERT | |
539 // This function is very high traffic. Define PARANOID to enable expensive | |
540 // asserts. | |
541 #ifdef PARANOID | |
542 // Signal handler should call ThreadLocalStorage::get_thread_slow() | |
543 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
544 assert(t != NULL && !t->is_inside_signal_handler(), | |
545 "Don't use Thread::current() inside signal handler"); | |
546 #endif | |
547 #endif | |
548 Thread* thread = ThreadLocalStorage::thread(); | |
549 assert(thread != NULL, "just checking"); | |
550 return thread; | |
551 } | |
552 | |
553 // Name support for threads. non-JavaThread subclasses with multiple | |
554 // uniquely named instances should derive from this. | |
555 class NamedThread: public Thread { | |
556 friend class VMStructs; | |
557 enum { | |
558 max_name_len = 64 | |
559 }; | |
560 private: | |
561 char* _name; | |
562 public: | |
563 NamedThread(); | |
564 ~NamedThread(); | |
565 // May only be called once per thread. | |
566 void set_name(const char* format, ...); | |
567 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } | |
568 }; | |
569 | |
570 // Worker threads are named and have an id of an assigned work. | |
571 class WorkerThread: public NamedThread { | |
572 private: | |
573 uint _id; | |
574 public: | |
575 WorkerThread() : _id(0) { } | |
576 void set_id(uint work_id) { _id = work_id; } | |
577 uint id() const { return _id; } | |
578 }; | |
579 | |
580 // A single WatcherThread is used for simulating timer interrupts. | |
581 class WatcherThread: public Thread { | |
582 friend class VMStructs; | |
583 public: | |
584 virtual void run(); | |
585 | |
586 private: | |
587 static WatcherThread* _watcher_thread; | |
588 | |
589 static bool _should_terminate; | |
590 public: | |
591 enum SomeConstants { | |
592 delay_interval = 10 // interrupt delay in milliseconds | |
593 }; | |
594 | |
595 // Constructor | |
596 WatcherThread(); | |
597 | |
598 // Tester | |
599 bool is_Watcher_thread() const { return true; } | |
600 | |
601 // Printing | |
602 char* name() const { return (char*)"VM Periodic Task Thread"; } | |
603 void print_on(outputStream* st) const; | |
604 void print() const { print_on(tty); } | |
605 | |
606 // Returns the single instance of WatcherThread | |
607 static WatcherThread* watcher_thread() { return _watcher_thread; } | |
608 | |
609 // Create and start the single instance of WatcherThread, or stop it on shutdown | |
610 static void start(); | |
611 static void stop(); | |
612 }; | |
613 | |
614 | |
615 class CompilerThread; | |
616 | |
617 typedef void (*ThreadFunction)(JavaThread*, TRAPS); | |
618 | |
619 class JavaThread: public Thread { | |
620 friend class VMStructs; | |
621 private: | |
622 JavaThread* _next; // The next thread in the Threads list | |
623 oop _threadObj; // The Java level thread object | |
624 | |
625 #ifdef ASSERT | |
626 private: | |
627 int _java_call_counter; | |
628 | |
629 public: | |
630 int java_call_counter() { return _java_call_counter; } | |
631 void inc_java_call_counter() { _java_call_counter++; } | |
632 void dec_java_call_counter() { | |
633 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); | |
634 _java_call_counter--; | |
635 } | |
636 private: // restore original namespace restriction | |
637 #endif // ifdef ASSERT | |
638 | |
639 #ifndef PRODUCT | |
640 public: | |
641 enum { | |
642 jump_ring_buffer_size = 16 | |
643 }; | |
644 private: // restore original namespace restriction | |
645 #endif | |
646 | |
647 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state | |
648 | |
649 ThreadFunction _entry_point; | |
650 | |
651 JNIEnv _jni_environment; | |
652 | |
653 // Deopt support | |
654 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization | |
655 | |
656 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we | |
657 // transition out of native | |
658 | |
659 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays | |
660 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped | |
661 // Because deoptimization is lazy we must save jvmti requests to set locals | |
662 // in compiled frames until we deoptimize and we have an interpreter frame. | |
663 // This holds the pointer to array (yeah like there might be more than one) of | |
664 // description of compiled vframes that have locals that need to be updated. | |
665 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; | |
666 | |
667 // Handshake value for fixing 6243940. We need a place for the i2c | |
668 // adapter to store the callee methodOop. This value is NEVER live | |
669 // across a gc point so it does NOT have to be gc'd | |
670 // The handshake is open ended since we can't be certain that it will | |
671 // be NULLed. This is because we rarely ever see the race and end up | |
672 // in handle_wrong_method which is the backend of the handshake. See | |
673 // code in i2c adapters and handle_wrong_method. | |
674 | |
675 methodOop _callee_target; | |
676 | |
677 // Oop results of VM runtime calls | |
678 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved | |
679 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved | |
680 | |
681 MonitorChunk* _monitor_chunks; // Contains the off stack monitors | |
682 // allocated during deoptimization | |
683 // and by JNI_MonitorEnter/Exit | |
684 | |
685 // Async. requests support | |
686 enum AsyncRequests { | |
687 _no_async_condition = 0, | |
688 _async_exception, | |
689 _async_unsafe_access_error | |
690 }; | |
691 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request | |
692 oop _pending_async_exception; | |
693 | |
694 // Safepoint support | |
695 public: // Expose _thread_state for SafeFetchInt() | |
696 volatile JavaThreadState _thread_state; | |
697 private: | |
698 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint | |
699 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened | |
700 | |
701 // JavaThread termination support | |
702 enum TerminatedTypes { | |
703 _not_terminated = 0xDEAD - 2, | |
704 _thread_exiting, // JavaThread::exit() has been called for this thread | |
705 _thread_terminated, // JavaThread is removed from thread list | |
706 _vm_exited // JavaThread is still executing native code, but VM is terminated | |
707 // only VM_Exit can set _vm_exited | |
708 }; | |
709 | |
710 // In general a JavaThread's _terminated field transitions as follows: | |
711 // | |
712 // _not_terminated => _thread_exiting => _thread_terminated | |
713 // | |
714 // _vm_exited is a special value to cover the case of a JavaThread | |
715 // executing native code after the VM itself is terminated. | |
716 TerminatedTypes _terminated; | |
717 // suspend/resume support | |
718 volatile bool _suspend_equivalent; // Suspend equivalent condition | |
719 jint _in_deopt_handler; // count of deoptimization | |
720 // handlers thread is in | |
721 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access | |
722 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was | |
723 // never locked) when throwing an exception. Used by interpreter only. | |
724 | |
725 // Flag to mark a JNI thread in the process of attaching - See CR 6404306 | |
726 // This flag is never set true other than at construction, and in that case | |
727 // is shortly thereafter set false | |
728 volatile bool _is_attaching; | |
729 | |
730 public: | |
731 // State of the stack guard pages for this thread. | |
732 enum StackGuardState { | |
733 stack_guard_unused, // not needed | |
734 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow | |
735 stack_guard_enabled // enabled | |
736 }; | |
737 | |
738 private: | |
739 | |
740 StackGuardState _stack_guard_state; | |
741 | |
742 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is | |
743 // used to temp. parsing values into and out of the runtime system during exception handling for compiled | |
744 // code) | |
745 volatile oop _exception_oop; // Exception thrown in compiled code | |
746 volatile address _exception_pc; // PC where exception happened | |
747 volatile address _exception_handler_pc; // PC for handler of exception | |
748 volatile int _exception_stack_size; // Size of frame where exception happened | |
749 | |
750 // support for compilation | |
751 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible) | |
752 | |
753 // support for JNI critical regions | |
754 jint _jni_active_critical; // count of entries into JNI critical region | |
755 | |
756 // For deadlock detection. | |
757 int _depth_first_number; | |
758 | |
759 // JVMTI PopFrame support | |
760 // This is set to popframe_pending to signal that top Java frame should be popped immediately | |
761 int _popframe_condition; | |
762 | |
763 #ifndef PRODUCT | |
764 int _jmp_ring_index; | |
765 struct { | |
766 // We use intptr_t instead of address so debugger doesn't try and display strings | |
767 intptr_t _target; | |
768 intptr_t _instruction; | |
769 const char* _file; | |
770 int _line; | |
771 } _jmp_ring[ jump_ring_buffer_size ]; | |
772 #endif /* PRODUCT */ | |
773 | |
342 | 774 #ifndef SERIALGC |
775 // Support for G1 barriers | |
776 | |
777 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. | |
778 // Set of all such queues. | |
779 static SATBMarkQueueSet _satb_mark_queue_set; | |
780 | |
781 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. | |
782 // Set of all such queues. | |
783 static DirtyCardQueueSet _dirty_card_queue_set; | |
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785 void flush_barrier_queues(); |
342 | 786 #endif // !SERIALGC |
787 | |
0 | 788 friend class VMThread; |
789 friend class ThreadWaitTransition; | |
790 friend class VM_Exit; | |
791 | |
792 void initialize(); // Initialized the instance variables | |
793 | |
794 public: | |
795 // Constructor | |
796 JavaThread(bool is_attaching = false); // for main thread and JNI attached threads | |
797 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); | |
798 ~JavaThread(); | |
799 | |
800 #ifdef ASSERT | |
801 // verify this JavaThread hasn't be published in the Threads::list yet | |
802 void verify_not_published(); | |
803 #endif | |
804 | |
805 //JNI functiontable getter/setter for JVMTI jni function table interception API. | |
806 void set_jni_functions(struct JNINativeInterface_* functionTable) { | |
807 _jni_environment.functions = functionTable; | |
808 } | |
809 struct JNINativeInterface_* get_jni_functions() { | |
810 return (struct JNINativeInterface_ *)_jni_environment.functions; | |
811 } | |
812 | |
813 // Executes Shutdown.shutdown() | |
814 void invoke_shutdown_hooks(); | |
815 | |
816 // Cleanup on thread exit | |
817 enum ExitType { | |
818 normal_exit, | |
819 jni_detach | |
820 }; | |
821 void exit(bool destroy_vm, ExitType exit_type = normal_exit); | |
822 | |
823 void cleanup_failed_attach_current_thread(); | |
824 | |
825 // Testers | |
826 virtual bool is_Java_thread() const { return true; } | |
827 | |
828 // compilation | |
829 void set_is_compiling(bool f) { _is_compiling = f; } | |
830 bool is_compiling() const { return _is_compiling; } | |
831 | |
832 // Thread chain operations | |
833 JavaThread* next() const { return _next; } | |
834 void set_next(JavaThread* p) { _next = p; } | |
835 | |
836 // Thread oop. threadObj() can be NULL for initial JavaThread | |
837 // (or for threads attached via JNI) | |
838 oop threadObj() const { return _threadObj; } | |
839 void set_threadObj(oop p) { _threadObj = p; } | |
840 | |
841 ThreadPriority java_priority() const; // Read from threadObj() | |
842 | |
843 // Prepare thread and add to priority queue. If a priority is | |
844 // not specified, use the priority of the thread object. Threads_lock | |
845 // must be held while this function is called. | |
846 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); | |
847 | |
848 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } | |
849 address saved_exception_pc() { return _saved_exception_pc; } | |
850 | |
851 | |
852 ThreadFunction entry_point() const { return _entry_point; } | |
853 | |
854 // Allocates a new Java level thread object for this thread. thread_name may be NULL. | |
855 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); | |
856 | |
857 // Last frame anchor routines | |
858 | |
859 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } | |
860 | |
861 // last_Java_sp | |
862 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } | |
863 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } | |
864 | |
865 // last_Java_pc | |
866 | |
867 address last_Java_pc(void) { return _anchor.last_Java_pc(); } | |
868 | |
869 // Safepoint support | |
870 JavaThreadState thread_state() const { return _thread_state; } | |
871 void set_thread_state(JavaThreadState s) { _thread_state=s; } | |
872 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } | |
873 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } | |
874 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } | |
875 | |
876 // thread has called JavaThread::exit() or is terminated | |
877 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } | |
878 // thread is terminated (no longer on the threads list); we compare | |
879 // against the two non-terminated values so that a freed JavaThread | |
880 // will also be considered terminated. | |
881 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } | |
882 void set_terminated(TerminatedTypes t) { _terminated = t; } | |
883 // special for Threads::remove() which is static: | |
884 void set_terminated_value() { _terminated = _thread_terminated; } | |
885 void block_if_vm_exited(); | |
886 | |
887 bool doing_unsafe_access() { return _doing_unsafe_access; } | |
888 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } | |
889 | |
890 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } | |
891 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } | |
892 | |
893 | |
894 // Suspend/resume support for JavaThread | |
895 | |
896 private: | |
897 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } | |
898 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } | |
899 | |
900 public: | |
901 void java_suspend(); | |
902 void java_resume(); | |
903 int java_suspend_self(); | |
904 | |
905 void check_and_wait_while_suspended() { | |
906 assert(JavaThread::current() == this, "sanity check"); | |
907 | |
908 bool do_self_suspend; | |
909 do { | |
910 // were we externally suspended while we were waiting? | |
911 do_self_suspend = handle_special_suspend_equivalent_condition(); | |
912 if (do_self_suspend) { | |
913 // don't surprise the thread that suspended us by returning | |
914 java_suspend_self(); | |
915 set_suspend_equivalent(); | |
916 } | |
917 } while (do_self_suspend); | |
918 } | |
919 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); | |
920 // Check for async exception in addition to safepoint and suspend request. | |
921 static void check_special_condition_for_native_trans(JavaThread *thread); | |
922 | |
923 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); | |
924 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { | |
925 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
926 // Warning: is_ext_suspend_completed() may temporarily drop the | |
927 // SR_lock to allow the thread to reach a stable thread state if | |
928 // it is currently in a transient thread state. | |
929 return is_ext_suspend_completed(false /*!called_by_wait */, | |
930 SuspendRetryDelay, bits); | |
931 } | |
932 | |
933 // We cannot allow wait_for_ext_suspend_completion() to run forever or | |
934 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally | |
935 // passed as the count and delay parameters. Experiments with specific | |
936 // calls to wait_for_ext_suspend_completion() can be done by passing | |
937 // other values in the code. Experiments with all calls can be done | |
938 // via the appropriate -XX options. | |
939 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); | |
940 | |
941 void set_external_suspend() { set_suspend_flag (_external_suspend); } | |
942 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } | |
943 | |
944 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } | |
945 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } | |
946 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } | |
947 | |
948 bool is_external_suspend() const { | |
949 return (_suspend_flags & _external_suspend) != 0; | |
950 } | |
951 // Whenever a thread transitions from native to vm/java it must suspend | |
952 // if external|deopt suspend is present. | |
953 bool is_suspend_after_native() const { | |
954 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; | |
955 } | |
956 | |
957 // external suspend request is completed | |
958 bool is_ext_suspended() const { | |
959 return (_suspend_flags & _ext_suspended) != 0; | |
960 } | |
961 | |
962 // legacy method that checked for either external suspension or vm suspension | |
963 bool is_any_suspended() const { | |
964 return is_ext_suspended(); | |
965 } | |
966 | |
967 bool is_external_suspend_with_lock() const { | |
968 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
969 return is_external_suspend(); | |
970 } | |
971 | |
972 // Special method to handle a pending external suspend request | |
973 // when a suspend equivalent condition lifts. | |
974 bool handle_special_suspend_equivalent_condition() { | |
975 assert(is_suspend_equivalent(), | |
976 "should only be called in a suspend equivalence condition"); | |
977 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
978 bool ret = is_external_suspend(); | |
979 if (!ret) { | |
980 // not about to self-suspend so clear suspend equivalence | |
981 clear_suspend_equivalent(); | |
982 } | |
983 // implied else: | |
984 // We have a pending external suspend request so we leave the | |
985 // suspend_equivalent flag set until java_suspend_self() sets | |
986 // the ext_suspended flag and clears the suspend_equivalent | |
987 // flag. This insures that wait_for_ext_suspend_completion() | |
988 // will return consistent values. | |
989 return ret; | |
990 } | |
991 | |
992 bool is_any_suspended_with_lock() const { | |
993 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
994 return is_any_suspended(); | |
995 } | |
996 // utility methods to see if we are doing some kind of suspension | |
997 bool is_being_ext_suspended() const { | |
998 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
999 return is_ext_suspended() || is_external_suspend(); | |
1000 } | |
1001 | |
1002 bool is_suspend_equivalent() const { return _suspend_equivalent; } | |
1003 | |
1004 void set_suspend_equivalent() { _suspend_equivalent = true; }; | |
1005 void clear_suspend_equivalent() { _suspend_equivalent = false; }; | |
1006 | |
1007 // Thread.stop support | |
1008 void send_thread_stop(oop throwable); | |
1009 AsyncRequests clear_special_runtime_exit_condition() { | |
1010 AsyncRequests x = _special_runtime_exit_condition; | |
1011 _special_runtime_exit_condition = _no_async_condition; | |
1012 return x; | |
1013 } | |
1014 | |
1015 // Are any async conditions present? | |
1016 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } | |
1017 | |
1018 void check_and_handle_async_exceptions(bool check_unsafe_error = true); | |
1019 | |
1020 // these next two are also used for self-suspension and async exception support | |
1021 void handle_special_runtime_exit_condition(bool check_asyncs = true); | |
1022 | |
1023 // Return true if JavaThread has an asynchronous condition or | |
1024 // if external suspension is requested. | |
1025 bool has_special_runtime_exit_condition() { | |
1026 // We call is_external_suspend() last since external suspend should | |
1027 // be less common. Because we don't use is_external_suspend_with_lock | |
1028 // it is possible that we won't see an asynchronous external suspend | |
1029 // request that has just gotten started, i.e., SR_lock grabbed but | |
1030 // _external_suspend field change either not made yet or not visible | |
1031 // yet. However, this is okay because the request is asynchronous and | |
1032 // we will see the new flag value the next time through. It's also | |
1033 // possible that the external suspend request is dropped after | |
1034 // we have checked is_external_suspend(), we will recheck its value | |
1035 // under SR_lock in java_suspend_self(). | |
1036 return (_special_runtime_exit_condition != _no_async_condition) || | |
1037 is_external_suspend() || is_deopt_suspend(); | |
1038 } | |
1039 | |
1040 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } | |
1041 | |
1042 void set_pending_async_exception(oop e) { | |
1043 _pending_async_exception = e; | |
1044 _special_runtime_exit_condition = _async_exception; | |
1045 set_has_async_exception(); | |
1046 } | |
1047 | |
1048 // Fast-locking support | |
1049 bool is_lock_owned(address adr) const; | |
1050 | |
1051 // Accessors for vframe array top | |
1052 // The linked list of vframe arrays are sorted on sp. This means when we | |
1053 // unpack the head must contain the vframe array to unpack. | |
1054 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } | |
1055 vframeArray* vframe_array_head() const { return _vframe_array_head; } | |
1056 | |
1057 // Side structure for defering update of java frame locals until deopt occurs | |
1058 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } | |
1059 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } | |
1060 | |
1061 // These only really exist to make debugging deopt problems simpler | |
1062 | |
1063 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } | |
1064 vframeArray* vframe_array_last() const { return _vframe_array_last; } | |
1065 | |
1066 // The special resourceMark used during deoptimization | |
1067 | |
1068 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } | |
1069 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } | |
1070 | |
1071 intptr_t* must_deopt_id() { return _must_deopt_id; } | |
1072 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } | |
1073 void clear_must_deopt_id() { _must_deopt_id = NULL; } | |
1074 | |
1075 methodOop callee_target() const { return _callee_target; } | |
1076 void set_callee_target (methodOop x) { _callee_target = x; } | |
1077 | |
1078 // Oop results of vm runtime calls | |
1079 oop vm_result() const { return _vm_result; } | |
1080 void set_vm_result (oop x) { _vm_result = x; } | |
1081 | |
1082 oop vm_result_2() const { return _vm_result_2; } | |
1083 void set_vm_result_2 (oop x) { _vm_result_2 = x; } | |
1084 | |
1085 // Exception handling for compiled methods | |
1086 oop exception_oop() const { return _exception_oop; } | |
1087 int exception_stack_size() const { return _exception_stack_size; } | |
1088 address exception_pc() const { return _exception_pc; } | |
1089 address exception_handler_pc() const { return _exception_handler_pc; } | |
1090 | |
1091 void set_exception_oop(oop o) { _exception_oop = o; } | |
1092 void set_exception_pc(address a) { _exception_pc = a; } | |
1093 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } | |
1094 void set_exception_stack_size(int size) { _exception_stack_size = size; } | |
1095 | |
1096 // Stack overflow support | |
1097 inline size_t stack_available(address cur_sp); | |
1098 address stack_yellow_zone_base() | |
1099 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } | |
1100 size_t stack_yellow_zone_size() | |
1101 { return StackYellowPages * os::vm_page_size(); } | |
1102 address stack_red_zone_base() | |
1103 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } | |
1104 size_t stack_red_zone_size() | |
1105 { return StackRedPages * os::vm_page_size(); } | |
1106 bool in_stack_yellow_zone(address a) | |
1107 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } | |
1108 bool in_stack_red_zone(address a) | |
1109 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } | |
1110 | |
1111 void create_stack_guard_pages(); | |
1112 void remove_stack_guard_pages(); | |
1113 | |
1114 void enable_stack_yellow_zone(); | |
1115 void disable_stack_yellow_zone(); | |
1116 void enable_stack_red_zone(); | |
1117 void disable_stack_red_zone(); | |
1118 | |
1119 inline bool stack_yellow_zone_disabled(); | |
1120 inline bool stack_yellow_zone_enabled(); | |
1121 | |
1122 // Attempt to reguard the stack after a stack overflow may have occurred. | |
1123 // Returns true if (a) guard pages are not needed on this thread, (b) the | |
1124 // pages are already guarded, or (c) the pages were successfully reguarded. | |
1125 // Returns false if there is not enough stack space to reguard the pages, in | |
1126 // which case the caller should unwind a frame and try again. The argument | |
1127 // should be the caller's (approximate) sp. | |
1128 bool reguard_stack(address cur_sp); | |
1129 // Similar to above but see if current stackpoint is out of the guard area | |
1130 // and reguard if possible. | |
1131 bool reguard_stack(void); | |
1132 | |
1133 // Misc. accessors/mutators | |
1134 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } | |
1135 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } | |
1136 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } | |
1137 | |
1138 #ifndef PRODUCT | |
1139 void record_jump(address target, address instr, const char* file, int line); | |
1140 #endif /* PRODUCT */ | |
1141 | |
1142 // For assembly stub generation | |
1143 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } | |
1144 #ifndef PRODUCT | |
1145 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } | |
1146 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } | |
1147 #endif /* PRODUCT */ | |
1148 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } | |
1149 static ByteSize last_Java_sp_offset() { | |
1150 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); | |
1151 } | |
1152 static ByteSize last_Java_pc_offset() { | |
1153 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); | |
1154 } | |
1155 static ByteSize frame_anchor_offset() { | |
1156 return byte_offset_of(JavaThread, _anchor); | |
1157 } | |
1158 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } | |
1159 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } | |
1160 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } | |
1161 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } | |
1162 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } | |
1163 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } | |
1164 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } | |
1165 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } | |
1166 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } | |
1167 static ByteSize exception_stack_size_offset() { return byte_offset_of(JavaThread, _exception_stack_size); } | |
1168 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } | |
1169 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } | |
1170 | |
1171 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } | |
1172 | |
342 | 1173 #ifndef SERIALGC |
1174 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } | |
1175 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } | |
1176 #endif // !SERIALGC | |
1177 | |
0 | 1178 // Returns the jni environment for this thread |
1179 JNIEnv* jni_environment() { return &_jni_environment; } | |
1180 | |
1181 static JavaThread* thread_from_jni_environment(JNIEnv* env) { | |
1182 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); | |
1183 // Only return NULL if thread is off the thread list; starting to | |
1184 // exit should not return NULL. | |
1185 if (thread_from_jni_env->is_terminated()) { | |
1186 thread_from_jni_env->block_if_vm_exited(); | |
1187 return NULL; | |
1188 } else { | |
1189 return thread_from_jni_env; | |
1190 } | |
1191 } | |
1192 | |
1193 // JNI critical regions. These can nest. | |
1194 bool in_critical() { return _jni_active_critical > 0; } | |
1195 void enter_critical() { assert(Thread::current() == this, | |
1196 "this must be current thread"); | |
1197 _jni_active_critical++; } | |
1198 void exit_critical() { assert(Thread::current() == this, | |
1199 "this must be current thread"); | |
1200 _jni_active_critical--; | |
1201 assert(_jni_active_critical >= 0, | |
1202 "JNI critical nesting problem?"); } | |
1203 | |
1204 // For deadlock detection | |
1205 int depth_first_number() { return _depth_first_number; } | |
1206 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } | |
1207 | |
1208 private: | |
1209 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } | |
1210 | |
1211 public: | |
1212 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } | |
1213 void add_monitor_chunk(MonitorChunk* chunk); | |
1214 void remove_monitor_chunk(MonitorChunk* chunk); | |
1215 bool in_deopt_handler() const { return _in_deopt_handler > 0; } | |
1216 void inc_in_deopt_handler() { _in_deopt_handler++; } | |
1217 void dec_in_deopt_handler() { | |
1218 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); | |
1219 if (_in_deopt_handler > 0) { // robustness | |
1220 _in_deopt_handler--; | |
1221 } | |
1222 } | |
1223 | |
1224 private: | |
1225 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } | |
1226 | |
1227 public: | |
1228 | |
1229 // Frame iteration; calls the function f for all frames on the stack | |
1230 void frames_do(void f(frame*, const RegisterMap*)); | |
1231 | |
1232 // Memory operations | |
1233 void oops_do(OopClosure* f); | |
1234 | |
1235 // Sweeper operations | |
1236 void nmethods_do(); | |
1237 | |
1238 // Memory management operations | |
1239 void gc_epilogue(); | |
1240 void gc_prologue(); | |
1241 | |
1242 // Misc. operations | |
1243 char* name() const { return (char*)get_thread_name(); } | |
1244 void print_on(outputStream* st) const; | |
1245 void print() const { print_on(tty); } | |
1246 void print_value(); | |
1247 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; | |
1248 void print_thread_state() const PRODUCT_RETURN; | |
1249 void print_on_error(outputStream* st, char* buf, int buflen) const; | |
1250 void verify(); | |
1251 const char* get_thread_name() const; | |
1252 private: | |
1253 // factor out low-level mechanics for use in both normal and error cases | |
1254 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; | |
1255 public: | |
1256 const char* get_threadgroup_name() const; | |
1257 const char* get_parent_name() const; | |
1258 | |
1259 // Accessing frames | |
1260 frame last_frame() { | |
1261 _anchor.make_walkable(this); | |
1262 return pd_last_frame(); | |
1263 } | |
1264 javaVFrame* last_java_vframe(RegisterMap* reg_map); | |
1265 | |
1266 // Returns method at 'depth' java or native frames down the stack | |
1267 // Used for security checks | |
1268 klassOop security_get_caller_class(int depth); | |
1269 | |
1270 // Print stack trace in external format | |
1271 void print_stack_on(outputStream* st); | |
1272 void print_stack() { print_stack_on(tty); } | |
1273 | |
1274 // Print stack traces in various internal formats | |
1275 void trace_stack() PRODUCT_RETURN; | |
1276 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; | |
1277 void trace_frames() PRODUCT_RETURN; | |
1278 | |
1279 // Returns the number of stack frames on the stack | |
1280 int depth() const; | |
1281 | |
1282 // Function for testing deoptimization | |
1283 void deoptimize(); | |
1284 void make_zombies(); | |
1285 | |
1286 void deoptimized_wrt_marked_nmethods(); | |
1287 | |
1288 // Profiling operation (see fprofile.cpp) | |
1289 public: | |
1290 bool profile_last_Java_frame(frame* fr); | |
1291 | |
1292 private: | |
1293 ThreadProfiler* _thread_profiler; | |
1294 private: | |
1295 friend class FlatProfiler; // uses both [gs]et_thread_profiler. | |
1296 friend class FlatProfilerTask; // uses get_thread_profiler. | |
1297 friend class ThreadProfilerMark; // uses get_thread_profiler. | |
1298 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } | |
1299 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { | |
1300 ThreadProfiler* result = _thread_profiler; | |
1301 _thread_profiler = tp; | |
1302 return result; | |
1303 } | |
1304 | |
1305 // Static operations | |
1306 public: | |
1307 // Returns the running thread as a JavaThread | |
1308 static inline JavaThread* current(); | |
1309 | |
1310 // Returns the active Java thread. Do not use this if you know you are calling | |
1311 // from a JavaThread, as it's slower than JavaThread::current. If called from | |
1312 // the VMThread, it also returns the JavaThread that instigated the VMThread's | |
1313 // operation. You may not want that either. | |
1314 static JavaThread* active(); | |
1315 | |
1316 inline CompilerThread* as_CompilerThread(); | |
1317 | |
1318 public: | |
1319 virtual void run(); | |
1320 void thread_main_inner(); | |
1321 | |
1322 private: | |
1323 // PRIVILEGED STACK | |
1324 PrivilegedElement* _privileged_stack_top; | |
1325 GrowableArray<oop>* _array_for_gc; | |
1326 public: | |
1327 | |
1328 // Returns the privileged_stack information. | |
1329 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } | |
1330 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } | |
1331 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } | |
1332 | |
1333 public: | |
1334 // Thread local information maintained by JVMTI. | |
1335 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } | |
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1336 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() |
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1337 // getter is used to get this JavaThread's JvmtiThreadState if it has |
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1338 // one which means NULL can be returned. JvmtiThreadState::state_for() |
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1339 // is used to get the specified JavaThread's JvmtiThreadState if it has |
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1340 // one or it allocates a new JvmtiThreadState for the JavaThread and |
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1341 // returns it. JvmtiThreadState::state_for() will return NULL only if |
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1342 // the specified JavaThread is exiting. |
0 | 1343 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
1344 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } | |
1345 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } | |
1346 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } | |
1347 | |
1348 // JVMTI PopFrame support | |
1349 // Setting and clearing popframe_condition | |
1350 // All of these enumerated values are bits. popframe_pending | |
1351 // indicates that a PopFrame() has been requested and not yet been | |
1352 // completed. popframe_processing indicates that that PopFrame() is in | |
1353 // the process of being completed. popframe_force_deopt_reexecution_bit | |
1354 // indicates that special handling is required when returning to a | |
1355 // deoptimized caller. | |
1356 enum PopCondition { | |
1357 popframe_inactive = 0x00, | |
1358 popframe_pending_bit = 0x01, | |
1359 popframe_processing_bit = 0x02, | |
1360 popframe_force_deopt_reexecution_bit = 0x04 | |
1361 }; | |
1362 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } | |
1363 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } | |
1364 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } | |
1365 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } | |
1366 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } | |
1367 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } | |
1368 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } | |
1369 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } | |
1370 #ifdef CC_INTERP | |
1371 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } | |
1372 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } | |
1373 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } | |
1374 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } | |
1375 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } | |
1376 #endif | |
1377 | |
1378 private: | |
1379 // Saved incoming arguments to popped frame. | |
1380 // Used only when popped interpreted frame returns to deoptimized frame. | |
1381 void* _popframe_preserved_args; | |
1382 int _popframe_preserved_args_size; | |
1383 | |
1384 public: | |
1385 void popframe_preserve_args(ByteSize size_in_bytes, void* start); | |
1386 void* popframe_preserved_args(); | |
1387 ByteSize popframe_preserved_args_size(); | |
1388 WordSize popframe_preserved_args_size_in_words(); | |
1389 void popframe_free_preserved_args(); | |
1390 | |
1391 | |
1392 private: | |
1393 JvmtiThreadState *_jvmti_thread_state; | |
1394 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; | |
1395 | |
1396 // Used by the interpreter in fullspeed mode for frame pop, method | |
1397 // entry, method exit and single stepping support. This field is | |
1398 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. | |
1399 // It can be set to zero asynchronously (i.e., without a VM operation | |
1400 // or a lock) so we have to be very careful. | |
1401 int _interp_only_mode; | |
1402 | |
1403 public: | |
1404 // used by the interpreter for fullspeed debugging support (see above) | |
1405 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } | |
1406 bool is_interp_only_mode() { return (_interp_only_mode != 0); } | |
1407 int get_interp_only_mode() { return _interp_only_mode; } | |
1408 void increment_interp_only_mode() { ++_interp_only_mode; } | |
1409 void decrement_interp_only_mode() { --_interp_only_mode; } | |
1410 | |
1411 private: | |
1412 ThreadStatistics *_thread_stat; | |
1413 | |
1414 public: | |
1415 ThreadStatistics* get_thread_stat() const { return _thread_stat; } | |
1416 | |
1417 // Return a blocker object for which this thread is blocked parking. | |
1418 oop current_park_blocker(); | |
1419 | |
1420 private: | |
1421 static size_t _stack_size_at_create; | |
1422 | |
1423 public: | |
1424 static inline size_t stack_size_at_create(void) { | |
1425 return _stack_size_at_create; | |
1426 } | |
1427 static inline void set_stack_size_at_create(size_t value) { | |
1428 _stack_size_at_create = value; | |
1429 } | |
1430 | |
342 | 1431 #ifndef SERIALGC |
1432 // SATB marking queue support | |
1433 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } | |
1434 static SATBMarkQueueSet& satb_mark_queue_set() { | |
1435 return _satb_mark_queue_set; | |
1436 } | |
1437 | |
1438 // Dirty card queue support | |
1439 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } | |
1440 static DirtyCardQueueSet& dirty_card_queue_set() { | |
1441 return _dirty_card_queue_set; | |
1442 } | |
1443 #endif // !SERIALGC | |
1444 | |
0 | 1445 // Machine dependent stuff |
1446 #include "incls/_thread_pd.hpp.incl" | |
1447 | |
1448 public: | |
1449 void set_blocked_on_compilation(bool value) { | |
1450 _blocked_on_compilation = value; | |
1451 } | |
1452 | |
1453 bool blocked_on_compilation() { | |
1454 return _blocked_on_compilation; | |
1455 } | |
1456 protected: | |
1457 bool _blocked_on_compilation; | |
1458 | |
1459 | |
1460 // JSR166 per-thread parker | |
1461 private: | |
1462 Parker* _parker; | |
1463 public: | |
1464 Parker* parker() { return _parker; } | |
1465 | |
1466 // Biased locking support | |
1467 private: | |
1468 GrowableArray<MonitorInfo*>* _cached_monitor_info; | |
1469 public: | |
1470 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } | |
1471 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } | |
1472 | |
1473 // clearing/querying jni attach status | |
1474 bool is_attaching() const { return _is_attaching; } | |
1475 void set_attached() { _is_attaching = false; OrderAccess::fence(); } | |
342 | 1476 private: |
1477 // This field is used to determine if a thread has claimed | |
1478 // a par_id: it is -1 if the thread has not claimed a par_id; | |
1479 // otherwise its value is the par_id that has been claimed. | |
1480 int _claimed_par_id; | |
1481 public: | |
1482 int get_claimed_par_id() { return _claimed_par_id; } | |
1483 void set_claimed_par_id(int id) { _claimed_par_id = id;} | |
0 | 1484 }; |
1485 | |
1486 // Inline implementation of JavaThread::current | |
1487 inline JavaThread* JavaThread::current() { | |
1488 Thread* thread = ThreadLocalStorage::thread(); | |
1489 assert(thread != NULL && thread->is_Java_thread(), "just checking"); | |
1490 return (JavaThread*)thread; | |
1491 } | |
1492 | |
1493 inline CompilerThread* JavaThread::as_CompilerThread() { | |
1494 assert(is_Compiler_thread(), "just checking"); | |
1495 return (CompilerThread*)this; | |
1496 } | |
1497 | |
1498 inline bool JavaThread::stack_yellow_zone_disabled() { | |
1499 return _stack_guard_state == stack_guard_yellow_disabled; | |
1500 } | |
1501 | |
1502 inline bool JavaThread::stack_yellow_zone_enabled() { | |
1503 #ifdef ASSERT | |
1504 if (os::uses_stack_guard_pages()) { | |
1505 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); | |
1506 } | |
1507 #endif | |
1508 return _stack_guard_state == stack_guard_enabled; | |
1509 } | |
1510 | |
1511 inline size_t JavaThread::stack_available(address cur_sp) { | |
1512 // This code assumes java stacks grow down | |
1513 address low_addr; // Limit on the address for deepest stack depth | |
1514 if ( _stack_guard_state == stack_guard_unused) { | |
1515 low_addr = stack_base() - stack_size(); | |
1516 } else { | |
1517 low_addr = stack_yellow_zone_base(); | |
1518 } | |
1519 return cur_sp > low_addr ? cur_sp - low_addr : 0; | |
1520 } | |
1521 | |
1522 // A JavaThread for low memory detection support | |
1523 class LowMemoryDetectorThread : public JavaThread { | |
1524 friend class VMStructs; | |
1525 public: | |
1526 LowMemoryDetectorThread(ThreadFunction entry_point) : JavaThread(entry_point) {}; | |
1527 | |
1528 // Hide this thread from external view. | |
1529 bool is_hidden_from_external_view() const { return true; } | |
1530 }; | |
1531 | |
1532 // A thread used for Compilation. | |
1533 class CompilerThread : public JavaThread { | |
1534 friend class VMStructs; | |
1535 private: | |
1536 CompilerCounters* _counters; | |
1537 | |
1538 ciEnv* _env; | |
1539 CompileLog* _log; | |
1540 CompileTask* _task; | |
1541 CompileQueue* _queue; | |
1542 | |
1543 public: | |
1544 | |
1545 static CompilerThread* current(); | |
1546 | |
1547 CompilerThread(CompileQueue* queue, CompilerCounters* counters); | |
1548 | |
1549 bool is_Compiler_thread() const { return true; } | |
1550 // Hide this compiler thread from external view. | |
1551 bool is_hidden_from_external_view() const { return true; } | |
1552 | |
1553 CompileQueue* queue() { return _queue; } | |
1554 CompilerCounters* counters() { return _counters; } | |
1555 | |
1556 // Get/set the thread's compilation environment. | |
1557 ciEnv* env() { return _env; } | |
1558 void set_env(ciEnv* env) { _env = env; } | |
1559 | |
1560 // Get/set the thread's logging information | |
1561 CompileLog* log() { return _log; } | |
1562 void init_log(CompileLog* log) { | |
1563 // Set once, for good. | |
1564 assert(_log == NULL, "set only once"); | |
1565 _log = log; | |
1566 } | |
1567 | |
1568 #ifndef PRODUCT | |
1569 private: | |
1570 IdealGraphPrinter *_ideal_graph_printer; | |
1571 public: | |
1572 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } | |
1573 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } | |
1574 #endif | |
1575 | |
1576 // Get/set the thread's current task | |
1577 CompileTask* task() { return _task; } | |
1578 void set_task(CompileTask* task) { _task = task; } | |
1579 }; | |
1580 | |
1581 inline CompilerThread* CompilerThread::current() { | |
1582 return JavaThread::current()->as_CompilerThread(); | |
1583 } | |
1584 | |
1585 | |
1586 // The active thread queue. It also keeps track of the current used | |
1587 // thread priorities. | |
1588 class Threads: AllStatic { | |
1589 friend class VMStructs; | |
1590 private: | |
1591 static JavaThread* _thread_list; | |
1592 static int _number_of_threads; | |
1593 static int _number_of_non_daemon_threads; | |
1594 static int _return_code; | |
1595 | |
1596 public: | |
1597 // Thread management | |
1598 // force_daemon is a concession to JNI, where we may need to add a | |
1599 // thread to the thread list before allocating its thread object | |
1600 static void add(JavaThread* p, bool force_daemon = false); | |
1601 static void remove(JavaThread* p); | |
1602 static bool includes(JavaThread* p); | |
1603 static JavaThread* first() { return _thread_list; } | |
1604 static void threads_do(ThreadClosure* tc); | |
1605 | |
1606 // Initializes the vm and creates the vm thread | |
1607 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); | |
1608 static void convert_vm_init_libraries_to_agents(); | |
1609 static void create_vm_init_libraries(); | |
1610 static void create_vm_init_agents(); | |
1611 static void shutdown_vm_agents(); | |
1612 static bool destroy_vm(); | |
1613 // Supported VM versions via JNI | |
1614 // Includes JNI_VERSION_1_1 | |
1615 static jboolean is_supported_jni_version_including_1_1(jint version); | |
1616 // Does not include JNI_VERSION_1_1 | |
1617 static jboolean is_supported_jni_version(jint version); | |
1618 | |
1619 // Garbage collection | |
1620 static void follow_other_roots(void f(oop*)); | |
1621 | |
1622 // Apply "f->do_oop" to all root oops in all threads. | |
1623 // This version may only be called by sequential code. | |
1624 static void oops_do(OopClosure* f); | |
1625 // This version may be called by sequential or parallel code. | |
1626 static void possibly_parallel_oops_do(OopClosure* f); | |
1627 // This creates a list of GCTasks, one per thread. | |
1628 static void create_thread_roots_tasks(GCTaskQueue* q); | |
1629 // This creates a list of GCTasks, one per thread, for marking objects. | |
1630 static void create_thread_roots_marking_tasks(GCTaskQueue* q); | |
1631 | |
1632 // Apply "f->do_oop" to roots in all threads that | |
1633 // are part of compiled frames | |
1634 static void compiled_frame_oops_do(OopClosure* f); | |
1635 | |
1636 static void convert_hcode_pointers(); | |
1637 static void restore_hcode_pointers(); | |
1638 | |
1639 // Sweeper | |
1640 static void nmethods_do(); | |
1641 | |
1642 static void gc_epilogue(); | |
1643 static void gc_prologue(); | |
1644 | |
1645 // Verification | |
1646 static void verify(); | |
1647 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); | |
1648 static void print(bool print_stacks, bool internal_format) { | |
1649 // this function is only used by debug.cpp | |
1650 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); | |
1651 } | |
1652 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); | |
1653 | |
1654 // Get Java threads that are waiting to enter a monitor. If doLock | |
1655 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
1656 // VM needs to be at a safepoint. | |
1657 static GrowableArray<JavaThread*>* get_pending_threads(int count, | |
1658 address monitor, bool doLock); | |
1659 | |
1660 // Get owning Java thread from the monitor's owner field. If doLock | |
1661 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
1662 // VM needs to be at a safepoint. | |
1663 static JavaThread *owning_thread_from_monitor_owner(address owner, | |
1664 bool doLock); | |
1665 | |
1666 // Number of threads on the active threads list | |
1667 static int number_of_threads() { return _number_of_threads; } | |
1668 // Number of non-daemon threads on the active threads list | |
1669 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } | |
1670 | |
1671 // Deoptimizes all frames tied to marked nmethods | |
1672 static void deoptimized_wrt_marked_nmethods(); | |
1673 | |
1674 }; | |
1675 | |
1676 | |
1677 // Thread iterator | |
1678 class ThreadClosure: public StackObj { | |
1679 public: | |
1680 virtual void do_thread(Thread* thread) = 0; | |
1681 }; | |
1682 | |
1683 class SignalHandlerMark: public StackObj { | |
1684 private: | |
1685 Thread* _thread; | |
1686 public: | |
1687 SignalHandlerMark(Thread* t) { | |
1688 _thread = t; | |
1689 if (_thread) _thread->enter_signal_handler(); | |
1690 } | |
1691 ~SignalHandlerMark() { | |
1692 if (_thread) _thread->leave_signal_handler(); | |
1693 _thread = NULL; | |
1694 } | |
1695 }; | |
1696 | |
1697 // ParkEvents are type-stable and immortal. | |
1698 // | |
1699 // Lifecycle: Once a ParkEvent is associated with a thread that ParkEvent remains | |
1700 // associated with the thread for the thread's entire lifetime - the relationship is | |
1701 // stable. A thread will be associated at most one ParkEvent. When the thread | |
1702 // expires, the ParkEvent moves to the EventFreeList. New threads attempt to allocate from | |
1703 // the EventFreeList before creating a new Event. Type-stability frees us from | |
1704 // worrying about stale Event or Thread references in the objectMonitor subsystem. | |
1705 // (A reference to ParkEvent is always valid, even though the event may no longer be associated | |
1706 // with the desired or expected thread. A key aspect of this design is that the callers of | |
1707 // park, unpark, etc must tolerate stale references and spurious wakeups). | |
1708 // | |
1709 // Only the "associated" thread can block (park) on the ParkEvent, although | |
1710 // any other thread can unpark a reachable parkevent. Park() is allowed to | |
1711 // return spuriously. In fact park-unpark a really just an optimization to | |
1712 // avoid unbounded spinning and surrender the CPU to be a polite system citizen. | |
1713 // A degenerate albeit "impolite" park-unpark implementation could simply return. | |
1714 // See http://blogs.sun.com/dave for more details. | |
1715 // | |
1716 // Eventually I'd like to eliminate Events and ObjectWaiters, both of which serve as | |
1717 // thread proxies, and simply make the THREAD structure type-stable and persistent. | |
1718 // Currently, we unpark events associated with threads, but ideally we'd just | |
1719 // unpark threads. | |
1720 // | |
1721 // The base-class, PlatformEvent, is platform-specific while the ParkEvent is | |
1722 // platform-independent. PlatformEvent provides park(), unpark(), etc., and | |
1723 // is abstract -- that is, a PlatformEvent should never be instantiated except | |
1724 // as part of a ParkEvent. | |
1725 // Equivalently we could have defined a platform-independent base-class that | |
1726 // exported Allocate(), Release(), etc. The platform-specific class would extend | |
1727 // that base-class, adding park(), unpark(), etc. | |
1728 // | |
1729 // A word of caution: The JVM uses 2 very similar constructs: | |
1730 // 1. ParkEvent are used for Java-level "monitor" synchronization. | |
1731 // 2. Parkers are used by JSR166-JUC park-unpark. | |
1732 // | |
1733 // We'll want to eventually merge these redundant facilities and use ParkEvent. | |
1734 | |
1735 | |
1736 class ParkEvent : public os::PlatformEvent { | |
1737 private: | |
1738 ParkEvent * FreeNext ; | |
1739 | |
1740 // Current association | |
1741 Thread * AssociatedWith ; | |
1742 intptr_t RawThreadIdentity ; // LWPID etc | |
1743 volatile int Incarnation ; | |
1744 | |
1745 // diagnostic : keep track of last thread to wake this thread. | |
1746 // this is useful for construction of dependency graphs. | |
1747 void * LastWaker ; | |
1748 | |
1749 public: | |
1750 // MCS-CLH list linkage and Native Mutex/Monitor | |
1751 ParkEvent * volatile ListNext ; | |
1752 ParkEvent * volatile ListPrev ; | |
1753 volatile intptr_t OnList ; | |
1754 volatile int TState ; | |
1755 volatile int Notified ; // for native monitor construct | |
1756 volatile int IsWaiting ; // Enqueued on WaitSet | |
1757 | |
1758 | |
1759 private: | |
1760 static ParkEvent * volatile FreeList ; | |
1761 static volatile int ListLock ; | |
1762 | |
1763 // It's prudent to mark the dtor as "private" | |
1764 // ensuring that it's not visible outside the package. | |
1765 // Unfortunately gcc warns about such usage, so | |
1766 // we revert to the less desirable "protected" visibility. | |
1767 // The other compilers accept private dtors. | |
1768 | |
1769 protected: // Ensure dtor is never invoked | |
1770 ~ParkEvent() { guarantee (0, "invariant") ; } | |
1771 | |
1772 ParkEvent() : PlatformEvent() { | |
1773 AssociatedWith = NULL ; | |
1774 FreeNext = NULL ; | |
1775 ListNext = NULL ; | |
1776 ListPrev = NULL ; | |
1777 OnList = 0 ; | |
1778 TState = 0 ; | |
1779 Notified = 0 ; | |
1780 IsWaiting = 0 ; | |
1781 } | |
1782 | |
1783 // We use placement-new to force ParkEvent instances to be | |
1784 // aligned on 256-byte address boundaries. This ensures that the least | |
1785 // significant byte of a ParkEvent address is always 0. | |
1786 | |
1787 void * operator new (size_t sz) ; | |
1788 void operator delete (void * a) ; | |
1789 | |
1790 public: | |
1791 static ParkEvent * Allocate (Thread * t) ; | |
1792 static void Release (ParkEvent * e) ; | |
1793 } ; |