Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.hpp @ 1299:9eba43136cb5
6934494: JSR 292 MethodHandles adapters should be generated into their own CodeBlob
Summary: Passing a null pointer to an InvokeDynamic function call should lead to a NullPointerException.
Reviewed-by: kvn, never
author | twisti |
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date | Tue, 16 Mar 2010 11:52:17 +0100 |
parents | 6deeaebad47a |
children | 93767e6a2dfd |
rev | line source |
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0 | 1 /* |
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2 * Copyright 1997-2010 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 | |
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51 // - NamedThread |
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52 // - VMThread |
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53 // - ConcurrentGCThread |
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54 // - WorkerThread |
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55 // - GangWorker |
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56 // - GCTaskThread |
0 | 57 // - JavaThread |
58 // - WatcherThread | |
59 | |
60 class Thread: public ThreadShadow { | |
61 friend class VMStructs; | |
62 private: | |
63 // Exception handling | |
64 // (Note: _pending_exception and friends are in ThreadShadow) | |
65 //oop _pending_exception; // pending exception for current thread | |
66 // const char* _exception_file; // file information for exception (debugging only) | |
67 // int _exception_line; // line information for exception (debugging only) | |
68 | |
69 // Support for forcing alignment of thread objects for biased locking | |
70 void* _real_malloc_address; | |
71 public: | |
72 void* operator new(size_t size); | |
73 void operator delete(void* p); | |
74 private: | |
75 | |
76 // *************************************************************** | |
77 // Suspend and resume support | |
78 // *************************************************************** | |
79 // | |
80 // VM suspend/resume no longer exists - it was once used for various | |
81 // things including safepoints but was deprecated and finally removed | |
82 // in Java 7. Because VM suspension was considered "internal" Java-level | |
83 // suspension was considered "external", and this legacy naming scheme | |
84 // remains. | |
85 // | |
86 // External suspend/resume requests come from JVM_SuspendThread, | |
87 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI | |
88 // ResumeThread. External | |
89 // suspend requests cause _external_suspend to be set and external | |
90 // resume requests cause _external_suspend to be cleared. | |
91 // External suspend requests do not nest on top of other external | |
92 // suspend requests. The higher level APIs reject suspend requests | |
93 // for already suspended threads. | |
94 // | |
95 // The external_suspend | |
96 // flag is checked by has_special_runtime_exit_condition() and java thread | |
97 // will self-suspend when handle_special_runtime_exit_condition() is | |
98 // called. Most uses of the _thread_blocked state in JavaThreads are | |
99 // considered the same as being externally suspended; if the blocking | |
100 // condition lifts, the JavaThread will self-suspend. Other places | |
101 // where VM checks for external_suspend include: | |
102 // + mutex granting (do not enter monitors when thread is suspended) | |
103 // + state transitions from _thread_in_native | |
104 // | |
105 // In general, java_suspend() does not wait for an external suspend | |
106 // request to complete. When it returns, the only guarantee is that | |
107 // the _external_suspend field is true. | |
108 // | |
109 // wait_for_ext_suspend_completion() is used to wait for an external | |
110 // suspend request to complete. External suspend requests are usually | |
111 // followed by some other interface call that requires the thread to | |
112 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into | |
113 // the interface that requires quiescence, we give the JavaThread a | |
114 // chance to self-suspend before we need it to be quiescent. This | |
115 // improves overall suspend/query performance. | |
116 // | |
117 // _suspend_flags controls the behavior of java_ suspend/resume. | |
118 // It must be set under the protection of SR_lock. Read from the flag is | |
119 // OK without SR_lock as long as the value is only used as a hint. | |
120 // (e.g., check _external_suspend first without lock and then recheck | |
121 // inside SR_lock and finish the suspension) | |
122 // | |
123 // _suspend_flags is also overloaded for other "special conditions" so | |
124 // that a single check indicates whether any special action is needed | |
125 // eg. for async exceptions. | |
126 // ------------------------------------------------------------------- | |
127 // Notes: | |
128 // 1. The suspend/resume logic no longer uses ThreadState in OSThread | |
129 // but we still update its value to keep other part of the system (mainly | |
130 // JVMTI) happy. ThreadState is legacy code (see notes in | |
131 // osThread.hpp). | |
132 // | |
133 // 2. It would be more natural if set_external_suspend() is private and | |
134 // part of java_suspend(), but that probably would affect the suspend/query | |
135 // performance. Need more investigation on this. | |
136 // | |
137 | |
138 // suspend/resume lock: used for self-suspend | |
139 Monitor* _SR_lock; | |
140 | |
141 protected: | |
142 enum SuspendFlags { | |
143 // NOTE: avoid using the sign-bit as cc generates different test code | |
144 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 | |
145 | |
146 _external_suspend = 0x20000000U, // thread is asked to self suspend | |
147 _ext_suspended = 0x40000000U, // thread has self-suspended | |
148 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt | |
149 | |
150 _has_async_exception = 0x00000001U // there is a pending async exception | |
151 }; | |
152 | |
153 // various suspension related flags - atomically updated | |
154 // overloaded for async exception checking in check_special_condition_for_native_trans. | |
155 volatile uint32_t _suspend_flags; | |
156 | |
157 private: | |
158 int _num_nested_signal; | |
159 | |
160 public: | |
161 void enter_signal_handler() { _num_nested_signal++; } | |
162 void leave_signal_handler() { _num_nested_signal--; } | |
163 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } | |
164 | |
165 private: | |
166 // Debug tracing | |
167 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; | |
168 | |
169 // Active_handles points to a block of handles | |
170 JNIHandleBlock* _active_handles; | |
171 | |
172 // One-element thread local free list | |
173 JNIHandleBlock* _free_handle_block; | |
174 | |
175 // Point to the last handle mark | |
176 HandleMark* _last_handle_mark; | |
177 | |
178 // The parity of the last strong_roots iteration in which this thread was | |
179 // claimed as a task. | |
180 jint _oops_do_parity; | |
181 | |
182 public: | |
183 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } | |
184 HandleMark* last_handle_mark() const { return _last_handle_mark; } | |
185 private: | |
186 | |
187 // debug support for checking if code does allow safepoints or not | |
188 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on | |
189 // mutex, or blocking on an object synchronizer (Java locking). | |
190 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases | |
191 // If !allow_allocation(), then an assertion failure will happen during allocation | |
192 // (Hence, !allow_safepoint() => !allow_allocation()). | |
193 // | |
194 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. | |
195 // | |
196 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen | |
197 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. | |
198 | |
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199 // Used by SkipGCALot class. |
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200 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? |
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201 |
0 | 202 // Record when GC is locked out via the GC_locker mechanism |
203 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;) | |
204 | |
205 friend class No_Alloc_Verifier; | |
206 friend class No_Safepoint_Verifier; | |
207 friend class Pause_No_Safepoint_Verifier; | |
208 friend class ThreadLocalStorage; | |
209 friend class GC_locker; | |
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; } | |
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257 virtual bool is_Named_thread() const { return false; } |
0 | 258 |
259 virtual char* name() const { return (char*)"Unknown thread"; } | |
260 | |
261 // Returns the current thread | |
262 static inline Thread* current(); | |
263 | |
264 // Common thread operations | |
265 static void set_priority(Thread* thread, ThreadPriority priority); | |
266 static ThreadPriority get_priority(const Thread* const thread); | |
267 static void start(Thread* thread); | |
268 static void interrupt(Thread* thr); | |
269 static bool is_interrupted(Thread* thr, bool clear_interrupted); | |
270 | |
271 Monitor* SR_lock() const { return _SR_lock; } | |
272 | |
273 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } | |
274 | |
275 void set_suspend_flag(SuspendFlags f) { | |
276 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
277 uint32_t flags; | |
278 do { | |
279 flags = _suspend_flags; | |
280 } | |
281 while (Atomic::cmpxchg((jint)(flags | f), | |
282 (volatile jint*)&_suspend_flags, | |
283 (jint)flags) != (jint)flags); | |
284 } | |
285 void clear_suspend_flag(SuspendFlags f) { | |
286 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
287 uint32_t flags; | |
288 do { | |
289 flags = _suspend_flags; | |
290 } | |
291 while (Atomic::cmpxchg((jint)(flags & ~f), | |
292 (volatile jint*)&_suspend_flags, | |
293 (jint)flags) != (jint)flags); | |
294 } | |
295 | |
296 void set_has_async_exception() { | |
297 set_suspend_flag(_has_async_exception); | |
298 } | |
299 void clear_has_async_exception() { | |
300 clear_suspend_flag(_has_async_exception); | |
301 } | |
302 | |
303 // Support for Unhandled Oop detection | |
304 #ifdef CHECK_UNHANDLED_OOPS | |
305 private: | |
306 UnhandledOops *_unhandled_oops; | |
307 public: | |
308 UnhandledOops* unhandled_oops() { return _unhandled_oops; } | |
309 // Mark oop safe for gc. It may be stack allocated but won't move. | |
310 void allow_unhandled_oop(oop *op) { | |
311 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); | |
312 } | |
313 // Clear oops at safepoint so crashes point to unhandled oop violator | |
314 void clear_unhandled_oops() { | |
315 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); | |
316 } | |
317 bool is_gc_locked_out() { return _gc_locked_out_count > 0; } | |
318 #endif // CHECK_UNHANDLED_OOPS | |
319 | |
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320 #ifndef PRODUCT |
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321 bool skip_gcalot() { return _skip_gcalot; } |
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322 void set_skip_gcalot(bool v) { _skip_gcalot = v; } |
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323 #endif |
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324 |
0 | 325 public: |
326 // Installs a pending exception to be inserted later | |
327 static void send_async_exception(oop thread_oop, oop java_throwable); | |
328 | |
329 // Resource area | |
330 ResourceArea* resource_area() const { return _resource_area; } | |
331 void set_resource_area(ResourceArea* area) { _resource_area = area; } | |
332 | |
333 OSThread* osthread() const { return _osthread; } | |
334 void set_osthread(OSThread* thread) { _osthread = thread; } | |
335 | |
336 // JNI handle support | |
337 JNIHandleBlock* active_handles() const { return _active_handles; } | |
338 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } | |
339 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } | |
340 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } | |
341 | |
342 // Internal handle support | |
343 HandleArea* handle_area() const { return _handle_area; } | |
344 void set_handle_area(HandleArea* area) { _handle_area = area; } | |
345 | |
346 // Thread-Local Allocation Buffer (TLAB) support | |
347 ThreadLocalAllocBuffer& tlab() { return _tlab; } | |
348 void initialize_tlab() { | |
349 if (UseTLAB) { | |
350 tlab().initialize(); | |
351 } | |
352 } | |
353 | |
354 // VM operation support | |
355 int vm_operation_ticket() { return ++_vm_operation_started_count; } | |
356 int vm_operation_completed_count() { return _vm_operation_completed_count; } | |
357 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } | |
358 | |
359 // For tracking the heavyweight monitor the thread is pending on. | |
360 ObjectMonitor* current_pending_monitor() { | |
361 return _current_pending_monitor; | |
362 } | |
363 void set_current_pending_monitor(ObjectMonitor* monitor) { | |
364 _current_pending_monitor = monitor; | |
365 } | |
366 void set_current_pending_monitor_is_from_java(bool from_java) { | |
367 _current_pending_monitor_is_from_java = from_java; | |
368 } | |
369 bool current_pending_monitor_is_from_java() { | |
370 return _current_pending_monitor_is_from_java; | |
371 } | |
372 | |
373 // For tracking the ObjectMonitor on which this thread called Object.wait() | |
374 ObjectMonitor* current_waiting_monitor() { | |
375 return _current_waiting_monitor; | |
376 } | |
377 void set_current_waiting_monitor(ObjectMonitor* monitor) { | |
378 _current_waiting_monitor = monitor; | |
379 } | |
380 | |
381 // GC support | |
382 // Apply "f->do_oop" to all root oops in "this". | |
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383 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames |
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384 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 385 |
386 // Handles the parallel case for the method below. | |
387 private: | |
388 bool claim_oops_do_par_case(int collection_parity); | |
389 public: | |
390 // Requires that "collection_parity" is that of the current strong roots | |
391 // iteration. If "is_par" is false, sets the parity of "this" to | |
392 // "collection_parity", and returns "true". If "is_par" is true, | |
393 // uses an atomic instruction to set the current threads parity to | |
394 // "collection_parity", if it is not already. Returns "true" iff the | |
395 // calling thread does the update, this indicates that the calling thread | |
396 // has claimed the thread's stack as a root groop in the current | |
397 // collection. | |
398 bool claim_oops_do(bool is_par, int collection_parity) { | |
399 if (!is_par) { | |
400 _oops_do_parity = collection_parity; | |
401 return true; | |
402 } else { | |
403 return claim_oops_do_par_case(collection_parity); | |
404 } | |
405 } | |
406 | |
407 // Sweeper support | |
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408 void nmethods_do(CodeBlobClosure* cf); |
0 | 409 |
410 // Tells if adr belong to this thread. This is used | |
411 // for checking if a lock is owned by the running thread. | |
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412 |
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413 // Used by fast lock support |
0 | 414 virtual bool is_lock_owned(address adr) const; |
415 | |
416 // Check if address is in the stack of the thread (not just for locks). | |
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417 // Warning: the method can only be used on the running thread |
0 | 418 bool is_in_stack(address adr) const; |
419 | |
420 // Sets this thread as starting thread. Returns failure if thread | |
421 // creation fails due to lack of memory, too many threads etc. | |
422 bool set_as_starting_thread(); | |
423 | |
424 protected: | |
425 // OS data associated with the thread | |
426 OSThread* _osthread; // Platform-specific thread information | |
427 | |
428 // Thread local resource area for temporary allocation within the VM | |
429 ResourceArea* _resource_area; | |
430 | |
431 // Thread local handle area for allocation of handles within the VM | |
432 HandleArea* _handle_area; | |
433 | |
434 // Support for stack overflow handling, get_thread, etc. | |
435 address _stack_base; | |
436 size_t _stack_size; | |
437 uintptr_t _self_raw_id; // used by get_thread (mutable) | |
438 int _lgrp_id; | |
439 | |
440 public: | |
441 // Stack overflow support | |
442 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } | |
443 | |
444 void set_stack_base(address base) { _stack_base = base; } | |
445 size_t stack_size() const { return _stack_size; } | |
446 void set_stack_size(size_t size) { _stack_size = size; } | |
447 void record_stack_base_and_size(); | |
448 | |
449 int lgrp_id() const { return _lgrp_id; } | |
450 void set_lgrp_id(int value) { _lgrp_id = value; } | |
451 | |
452 // Printing | |
453 void print_on(outputStream* st) const; | |
454 void print() const { print_on(tty); } | |
455 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; | |
456 | |
457 // Debug-only code | |
458 | |
459 #ifdef ASSERT | |
460 private: | |
461 // Deadlock detection support for Mutex locks. List of locks own by thread. | |
462 Monitor *_owned_locks; | |
463 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, | |
464 // thus the friendship | |
465 friend class Mutex; | |
466 friend class Monitor; | |
467 | |
468 public: | |
469 void print_owned_locks_on(outputStream* st) const; | |
470 void print_owned_locks() const { print_owned_locks_on(tty); } | |
471 Monitor * owned_locks() const { return _owned_locks; } | |
472 bool owns_locks() const { return owned_locks() != NULL; } | |
473 bool owns_locks_but_compiled_lock() const; | |
474 | |
475 // Deadlock detection | |
476 bool allow_allocation() { return _allow_allocation_count == 0; } | |
477 #endif | |
478 | |
479 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; | |
480 | |
481 private: | |
482 volatile int _jvmti_env_iteration_count; | |
483 | |
484 public: | |
485 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } | |
486 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } | |
487 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } | |
488 | |
489 // Code generation | |
490 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } | |
491 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } | |
492 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } | |
493 | |
494 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } | |
495 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } | |
496 static ByteSize omFreeList_offset() { return byte_offset_of(Thread, omFreeList); } | |
497 | |
498 #define TLAB_FIELD_OFFSET(name) \ | |
499 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } | |
500 | |
501 TLAB_FIELD_OFFSET(start) | |
502 TLAB_FIELD_OFFSET(end) | |
503 TLAB_FIELD_OFFSET(top) | |
504 TLAB_FIELD_OFFSET(pf_top) | |
505 TLAB_FIELD_OFFSET(size) // desired_size | |
506 TLAB_FIELD_OFFSET(refill_waste_limit) | |
507 TLAB_FIELD_OFFSET(number_of_refills) | |
508 TLAB_FIELD_OFFSET(fast_refill_waste) | |
509 TLAB_FIELD_OFFSET(slow_allocations) | |
510 | |
511 #undef TLAB_FIELD_OFFSET | |
512 | |
513 public: | |
514 volatile intptr_t _Stalled ; | |
515 volatile int _TypeTag ; | |
516 ParkEvent * _ParkEvent ; // for synchronized() | |
517 ParkEvent * _SleepEvent ; // for Thread.sleep | |
518 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor | |
519 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease | |
520 int NativeSyncRecursion ; // diagnostic | |
521 | |
522 volatile int _OnTrap ; // Resume-at IP delta | |
523 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG | |
524 jint _hashStateX ; // thread-specific hashCode generator state | |
525 jint _hashStateY ; | |
526 jint _hashStateZ ; | |
527 void * _schedctl ; | |
528 | |
529 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code | |
530 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); } | |
531 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); } | |
532 | |
533 volatile jint rng [4] ; // RNG for spin loop | |
534 | |
535 // Low-level leaf-lock primitives used to implement synchronization | |
536 // and native monitor-mutex infrastructure. | |
537 // Not for general synchronization use. | |
538 static void SpinAcquire (volatile int * Lock, const char * Name) ; | |
539 static void SpinRelease (volatile int * Lock) ; | |
540 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; | |
541 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; | |
542 static void muxRelease (volatile intptr_t * Lock) ; | |
543 | |
544 }; | |
545 | |
546 // Inline implementation of Thread::current() | |
547 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of | |
548 // startup. | |
549 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same | |
550 // period. This is inlined in thread_<os_family>.inline.hpp. | |
551 | |
552 inline Thread* Thread::current() { | |
553 #ifdef ASSERT | |
554 // This function is very high traffic. Define PARANOID to enable expensive | |
555 // asserts. | |
556 #ifdef PARANOID | |
557 // Signal handler should call ThreadLocalStorage::get_thread_slow() | |
558 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
559 assert(t != NULL && !t->is_inside_signal_handler(), | |
560 "Don't use Thread::current() inside signal handler"); | |
561 #endif | |
562 #endif | |
563 Thread* thread = ThreadLocalStorage::thread(); | |
564 assert(thread != NULL, "just checking"); | |
565 return thread; | |
566 } | |
567 | |
568 // Name support for threads. non-JavaThread subclasses with multiple | |
569 // uniquely named instances should derive from this. | |
570 class NamedThread: public Thread { | |
571 friend class VMStructs; | |
572 enum { | |
573 max_name_len = 64 | |
574 }; | |
575 private: | |
576 char* _name; | |
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577 // log JavaThread being processed by oops_do |
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578 JavaThread* _processed_thread; |
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579 |
0 | 580 public: |
581 NamedThread(); | |
582 ~NamedThread(); | |
583 // May only be called once per thread. | |
584 void set_name(const char* format, ...); | |
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585 virtual bool is_Named_thread() const { return true; } |
0 | 586 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } |
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587 JavaThread *processed_thread() { return _processed_thread; } |
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588 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } |
0 | 589 }; |
590 | |
591 // Worker threads are named and have an id of an assigned work. | |
592 class WorkerThread: public NamedThread { | |
593 private: | |
594 uint _id; | |
595 public: | |
596 WorkerThread() : _id(0) { } | |
597 void set_id(uint work_id) { _id = work_id; } | |
598 uint id() const { return _id; } | |
599 }; | |
600 | |
601 // A single WatcherThread is used for simulating timer interrupts. | |
602 class WatcherThread: public Thread { | |
603 friend class VMStructs; | |
604 public: | |
605 virtual void run(); | |
606 | |
607 private: | |
608 static WatcherThread* _watcher_thread; | |
609 | |
610 static bool _should_terminate; | |
611 public: | |
612 enum SomeConstants { | |
613 delay_interval = 10 // interrupt delay in milliseconds | |
614 }; | |
615 | |
616 // Constructor | |
617 WatcherThread(); | |
618 | |
619 // Tester | |
620 bool is_Watcher_thread() const { return true; } | |
621 | |
622 // Printing | |
623 char* name() const { return (char*)"VM Periodic Task Thread"; } | |
624 void print_on(outputStream* st) const; | |
625 void print() const { print_on(tty); } | |
626 | |
627 // Returns the single instance of WatcherThread | |
628 static WatcherThread* watcher_thread() { return _watcher_thread; } | |
629 | |
630 // Create and start the single instance of WatcherThread, or stop it on shutdown | |
631 static void start(); | |
632 static void stop(); | |
633 }; | |
634 | |
635 | |
636 class CompilerThread; | |
637 | |
638 typedef void (*ThreadFunction)(JavaThread*, TRAPS); | |
639 | |
640 class JavaThread: public Thread { | |
641 friend class VMStructs; | |
642 private: | |
643 JavaThread* _next; // The next thread in the Threads list | |
644 oop _threadObj; // The Java level thread object | |
645 | |
646 #ifdef ASSERT | |
647 private: | |
648 int _java_call_counter; | |
649 | |
650 public: | |
651 int java_call_counter() { return _java_call_counter; } | |
652 void inc_java_call_counter() { _java_call_counter++; } | |
653 void dec_java_call_counter() { | |
654 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); | |
655 _java_call_counter--; | |
656 } | |
657 private: // restore original namespace restriction | |
658 #endif // ifdef ASSERT | |
659 | |
660 #ifndef PRODUCT | |
661 public: | |
662 enum { | |
663 jump_ring_buffer_size = 16 | |
664 }; | |
665 private: // restore original namespace restriction | |
666 #endif | |
667 | |
668 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state | |
669 | |
670 ThreadFunction _entry_point; | |
671 | |
672 JNIEnv _jni_environment; | |
673 | |
674 // Deopt support | |
675 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization | |
676 | |
677 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we | |
678 // transition out of native | |
679 | |
680 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays | |
681 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped | |
682 // Because deoptimization is lazy we must save jvmti requests to set locals | |
683 // in compiled frames until we deoptimize and we have an interpreter frame. | |
684 // This holds the pointer to array (yeah like there might be more than one) of | |
685 // description of compiled vframes that have locals that need to be updated. | |
686 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; | |
687 | |
688 // Handshake value for fixing 6243940. We need a place for the i2c | |
689 // adapter to store the callee methodOop. This value is NEVER live | |
690 // across a gc point so it does NOT have to be gc'd | |
691 // The handshake is open ended since we can't be certain that it will | |
692 // be NULLed. This is because we rarely ever see the race and end up | |
693 // in handle_wrong_method which is the backend of the handshake. See | |
694 // code in i2c adapters and handle_wrong_method. | |
695 | |
696 methodOop _callee_target; | |
697 | |
698 // Oop results of VM runtime calls | |
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699 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved |
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700 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved |
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701 |
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702 // See ReduceInitialCardMarks: this holds the precise space interval of |
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703 // the most recent slow path allocation for which compiled code has |
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704 // elided card-marks for performance along the fast-path. |
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705 MemRegion _deferred_card_mark; |
0 | 706 |
707 MonitorChunk* _monitor_chunks; // Contains the off stack monitors | |
708 // allocated during deoptimization | |
709 // and by JNI_MonitorEnter/Exit | |
710 | |
711 // Async. requests support | |
712 enum AsyncRequests { | |
713 _no_async_condition = 0, | |
714 _async_exception, | |
715 _async_unsafe_access_error | |
716 }; | |
717 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request | |
718 oop _pending_async_exception; | |
719 | |
720 // Safepoint support | |
721 public: // Expose _thread_state for SafeFetchInt() | |
722 volatile JavaThreadState _thread_state; | |
723 private: | |
724 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint | |
725 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened | |
726 | |
727 // JavaThread termination support | |
728 enum TerminatedTypes { | |
729 _not_terminated = 0xDEAD - 2, | |
730 _thread_exiting, // JavaThread::exit() has been called for this thread | |
731 _thread_terminated, // JavaThread is removed from thread list | |
732 _vm_exited // JavaThread is still executing native code, but VM is terminated | |
733 // only VM_Exit can set _vm_exited | |
734 }; | |
735 | |
736 // In general a JavaThread's _terminated field transitions as follows: | |
737 // | |
738 // _not_terminated => _thread_exiting => _thread_terminated | |
739 // | |
740 // _vm_exited is a special value to cover the case of a JavaThread | |
741 // executing native code after the VM itself is terminated. | |
742 TerminatedTypes _terminated; | |
743 // suspend/resume support | |
744 volatile bool _suspend_equivalent; // Suspend equivalent condition | |
745 jint _in_deopt_handler; // count of deoptimization | |
746 // handlers thread is in | |
747 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access | |
748 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was | |
749 // never locked) when throwing an exception. Used by interpreter only. | |
750 | |
751 // Flag to mark a JNI thread in the process of attaching - See CR 6404306 | |
752 // This flag is never set true other than at construction, and in that case | |
753 // is shortly thereafter set false | |
754 volatile bool _is_attaching; | |
755 | |
756 public: | |
757 // State of the stack guard pages for this thread. | |
758 enum StackGuardState { | |
759 stack_guard_unused, // not needed | |
760 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow | |
761 stack_guard_enabled // enabled | |
762 }; | |
763 | |
764 private: | |
765 | |
766 StackGuardState _stack_guard_state; | |
767 | |
768 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is | |
769 // used to temp. parsing values into and out of the runtime system during exception handling for compiled | |
770 // code) | |
771 volatile oop _exception_oop; // Exception thrown in compiled code | |
772 volatile address _exception_pc; // PC where exception happened | |
773 volatile address _exception_handler_pc; // PC for handler of exception | |
774 volatile int _exception_stack_size; // Size of frame where exception happened | |
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775 volatile int _is_method_handle_exception; // True if the current exception PC is at a MethodHandle call. |
0 | 776 |
777 // support for compilation | |
778 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible) | |
779 | |
780 // support for JNI critical regions | |
781 jint _jni_active_critical; // count of entries into JNI critical region | |
782 | |
783 // For deadlock detection. | |
784 int _depth_first_number; | |
785 | |
786 // JVMTI PopFrame support | |
787 // This is set to popframe_pending to signal that top Java frame should be popped immediately | |
788 int _popframe_condition; | |
789 | |
790 #ifndef PRODUCT | |
791 int _jmp_ring_index; | |
792 struct { | |
793 // We use intptr_t instead of address so debugger doesn't try and display strings | |
794 intptr_t _target; | |
795 intptr_t _instruction; | |
796 const char* _file; | |
797 int _line; | |
798 } _jmp_ring[ jump_ring_buffer_size ]; | |
799 #endif /* PRODUCT */ | |
800 | |
342 | 801 #ifndef SERIALGC |
802 // Support for G1 barriers | |
803 | |
804 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. | |
805 // Set of all such queues. | |
806 static SATBMarkQueueSet _satb_mark_queue_set; | |
807 | |
808 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. | |
809 // Set of all such queues. | |
810 static DirtyCardQueueSet _dirty_card_queue_set; | |
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811 |
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812 void flush_barrier_queues(); |
342 | 813 #endif // !SERIALGC |
814 | |
0 | 815 friend class VMThread; |
816 friend class ThreadWaitTransition; | |
817 friend class VM_Exit; | |
818 | |
819 void initialize(); // Initialized the instance variables | |
820 | |
821 public: | |
822 // Constructor | |
823 JavaThread(bool is_attaching = false); // for main thread and JNI attached threads | |
824 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); | |
825 ~JavaThread(); | |
826 | |
827 #ifdef ASSERT | |
828 // verify this JavaThread hasn't be published in the Threads::list yet | |
829 void verify_not_published(); | |
830 #endif | |
831 | |
832 //JNI functiontable getter/setter for JVMTI jni function table interception API. | |
833 void set_jni_functions(struct JNINativeInterface_* functionTable) { | |
834 _jni_environment.functions = functionTable; | |
835 } | |
836 struct JNINativeInterface_* get_jni_functions() { | |
837 return (struct JNINativeInterface_ *)_jni_environment.functions; | |
838 } | |
839 | |
840 // Executes Shutdown.shutdown() | |
841 void invoke_shutdown_hooks(); | |
842 | |
843 // Cleanup on thread exit | |
844 enum ExitType { | |
845 normal_exit, | |
846 jni_detach | |
847 }; | |
848 void exit(bool destroy_vm, ExitType exit_type = normal_exit); | |
849 | |
850 void cleanup_failed_attach_current_thread(); | |
851 | |
852 // Testers | |
853 virtual bool is_Java_thread() const { return true; } | |
854 | |
855 // compilation | |
856 void set_is_compiling(bool f) { _is_compiling = f; } | |
857 bool is_compiling() const { return _is_compiling; } | |
858 | |
859 // Thread chain operations | |
860 JavaThread* next() const { return _next; } | |
861 void set_next(JavaThread* p) { _next = p; } | |
862 | |
863 // Thread oop. threadObj() can be NULL for initial JavaThread | |
864 // (or for threads attached via JNI) | |
865 oop threadObj() const { return _threadObj; } | |
866 void set_threadObj(oop p) { _threadObj = p; } | |
867 | |
868 ThreadPriority java_priority() const; // Read from threadObj() | |
869 | |
870 // Prepare thread and add to priority queue. If a priority is | |
871 // not specified, use the priority of the thread object. Threads_lock | |
872 // must be held while this function is called. | |
873 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); | |
874 | |
875 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } | |
876 address saved_exception_pc() { return _saved_exception_pc; } | |
877 | |
878 | |
879 ThreadFunction entry_point() const { return _entry_point; } | |
880 | |
881 // Allocates a new Java level thread object for this thread. thread_name may be NULL. | |
882 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); | |
883 | |
884 // Last frame anchor routines | |
885 | |
886 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } | |
887 | |
888 // last_Java_sp | |
889 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } | |
890 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } | |
891 | |
892 // last_Java_pc | |
893 | |
894 address last_Java_pc(void) { return _anchor.last_Java_pc(); } | |
895 | |
896 // Safepoint support | |
897 JavaThreadState thread_state() const { return _thread_state; } | |
898 void set_thread_state(JavaThreadState s) { _thread_state=s; } | |
899 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } | |
900 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } | |
901 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } | |
902 | |
903 // thread has called JavaThread::exit() or is terminated | |
904 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } | |
905 // thread is terminated (no longer on the threads list); we compare | |
906 // against the two non-terminated values so that a freed JavaThread | |
907 // will also be considered terminated. | |
908 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } | |
909 void set_terminated(TerminatedTypes t) { _terminated = t; } | |
910 // special for Threads::remove() which is static: | |
911 void set_terminated_value() { _terminated = _thread_terminated; } | |
912 void block_if_vm_exited(); | |
913 | |
914 bool doing_unsafe_access() { return _doing_unsafe_access; } | |
915 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } | |
916 | |
917 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } | |
918 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } | |
919 | |
920 | |
921 // Suspend/resume support for JavaThread | |
922 | |
923 private: | |
924 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } | |
925 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } | |
926 | |
927 public: | |
928 void java_suspend(); | |
929 void java_resume(); | |
930 int java_suspend_self(); | |
931 | |
932 void check_and_wait_while_suspended() { | |
933 assert(JavaThread::current() == this, "sanity check"); | |
934 | |
935 bool do_self_suspend; | |
936 do { | |
937 // were we externally suspended while we were waiting? | |
938 do_self_suspend = handle_special_suspend_equivalent_condition(); | |
939 if (do_self_suspend) { | |
940 // don't surprise the thread that suspended us by returning | |
941 java_suspend_self(); | |
942 set_suspend_equivalent(); | |
943 } | |
944 } while (do_self_suspend); | |
945 } | |
946 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); | |
947 // Check for async exception in addition to safepoint and suspend request. | |
948 static void check_special_condition_for_native_trans(JavaThread *thread); | |
949 | |
950 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); | |
951 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { | |
952 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
953 // Warning: is_ext_suspend_completed() may temporarily drop the | |
954 // SR_lock to allow the thread to reach a stable thread state if | |
955 // it is currently in a transient thread state. | |
956 return is_ext_suspend_completed(false /*!called_by_wait */, | |
957 SuspendRetryDelay, bits); | |
958 } | |
959 | |
960 // We cannot allow wait_for_ext_suspend_completion() to run forever or | |
961 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally | |
962 // passed as the count and delay parameters. Experiments with specific | |
963 // calls to wait_for_ext_suspend_completion() can be done by passing | |
964 // other values in the code. Experiments with all calls can be done | |
965 // via the appropriate -XX options. | |
966 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); | |
967 | |
968 void set_external_suspend() { set_suspend_flag (_external_suspend); } | |
969 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } | |
970 | |
971 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } | |
972 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } | |
973 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } | |
974 | |
975 bool is_external_suspend() const { | |
976 return (_suspend_flags & _external_suspend) != 0; | |
977 } | |
978 // Whenever a thread transitions from native to vm/java it must suspend | |
979 // if external|deopt suspend is present. | |
980 bool is_suspend_after_native() const { | |
981 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; | |
982 } | |
983 | |
984 // external suspend request is completed | |
985 bool is_ext_suspended() const { | |
986 return (_suspend_flags & _ext_suspended) != 0; | |
987 } | |
988 | |
989 bool is_external_suspend_with_lock() const { | |
990 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
991 return is_external_suspend(); | |
992 } | |
993 | |
994 // Special method to handle a pending external suspend request | |
995 // when a suspend equivalent condition lifts. | |
996 bool handle_special_suspend_equivalent_condition() { | |
997 assert(is_suspend_equivalent(), | |
998 "should only be called in a suspend equivalence condition"); | |
999 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1000 bool ret = is_external_suspend(); | |
1001 if (!ret) { | |
1002 // not about to self-suspend so clear suspend equivalence | |
1003 clear_suspend_equivalent(); | |
1004 } | |
1005 // implied else: | |
1006 // We have a pending external suspend request so we leave the | |
1007 // suspend_equivalent flag set until java_suspend_self() sets | |
1008 // the ext_suspended flag and clears the suspend_equivalent | |
1009 // flag. This insures that wait_for_ext_suspend_completion() | |
1010 // will return consistent values. | |
1011 return ret; | |
1012 } | |
1013 | |
1014 // utility methods to see if we are doing some kind of suspension | |
1015 bool is_being_ext_suspended() const { | |
1016 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1017 return is_ext_suspended() || is_external_suspend(); | |
1018 } | |
1019 | |
1020 bool is_suspend_equivalent() const { return _suspend_equivalent; } | |
1021 | |
1022 void set_suspend_equivalent() { _suspend_equivalent = true; }; | |
1023 void clear_suspend_equivalent() { _suspend_equivalent = false; }; | |
1024 | |
1025 // Thread.stop support | |
1026 void send_thread_stop(oop throwable); | |
1027 AsyncRequests clear_special_runtime_exit_condition() { | |
1028 AsyncRequests x = _special_runtime_exit_condition; | |
1029 _special_runtime_exit_condition = _no_async_condition; | |
1030 return x; | |
1031 } | |
1032 | |
1033 // Are any async conditions present? | |
1034 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } | |
1035 | |
1036 void check_and_handle_async_exceptions(bool check_unsafe_error = true); | |
1037 | |
1038 // these next two are also used for self-suspension and async exception support | |
1039 void handle_special_runtime_exit_condition(bool check_asyncs = true); | |
1040 | |
1041 // Return true if JavaThread has an asynchronous condition or | |
1042 // if external suspension is requested. | |
1043 bool has_special_runtime_exit_condition() { | |
1044 // We call is_external_suspend() last since external suspend should | |
1045 // be less common. Because we don't use is_external_suspend_with_lock | |
1046 // it is possible that we won't see an asynchronous external suspend | |
1047 // request that has just gotten started, i.e., SR_lock grabbed but | |
1048 // _external_suspend field change either not made yet or not visible | |
1049 // yet. However, this is okay because the request is asynchronous and | |
1050 // we will see the new flag value the next time through. It's also | |
1051 // possible that the external suspend request is dropped after | |
1052 // we have checked is_external_suspend(), we will recheck its value | |
1053 // under SR_lock in java_suspend_self(). | |
1054 return (_special_runtime_exit_condition != _no_async_condition) || | |
1055 is_external_suspend() || is_deopt_suspend(); | |
1056 } | |
1057 | |
1058 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } | |
1059 | |
1060 void set_pending_async_exception(oop e) { | |
1061 _pending_async_exception = e; | |
1062 _special_runtime_exit_condition = _async_exception; | |
1063 set_has_async_exception(); | |
1064 } | |
1065 | |
1066 // Fast-locking support | |
1067 bool is_lock_owned(address adr) const; | |
1068 | |
1069 // Accessors for vframe array top | |
1070 // The linked list of vframe arrays are sorted on sp. This means when we | |
1071 // unpack the head must contain the vframe array to unpack. | |
1072 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } | |
1073 vframeArray* vframe_array_head() const { return _vframe_array_head; } | |
1074 | |
1075 // Side structure for defering update of java frame locals until deopt occurs | |
1076 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } | |
1077 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } | |
1078 | |
1079 // These only really exist to make debugging deopt problems simpler | |
1080 | |
1081 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } | |
1082 vframeArray* vframe_array_last() const { return _vframe_array_last; } | |
1083 | |
1084 // The special resourceMark used during deoptimization | |
1085 | |
1086 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } | |
1087 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } | |
1088 | |
1089 intptr_t* must_deopt_id() { return _must_deopt_id; } | |
1090 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } | |
1091 void clear_must_deopt_id() { _must_deopt_id = NULL; } | |
1092 | |
1093 methodOop callee_target() const { return _callee_target; } | |
1094 void set_callee_target (methodOop x) { _callee_target = x; } | |
1095 | |
1096 // Oop results of vm runtime calls | |
1097 oop vm_result() const { return _vm_result; } | |
1098 void set_vm_result (oop x) { _vm_result = x; } | |
1099 | |
1100 oop vm_result_2() const { return _vm_result_2; } | |
1101 void set_vm_result_2 (oop x) { _vm_result_2 = x; } | |
1102 | |
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1103 MemRegion deferred_card_mark() const { return _deferred_card_mark; } |
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1104 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } |
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1105 |
0 | 1106 // Exception handling for compiled methods |
1107 oop exception_oop() const { return _exception_oop; } | |
1108 int exception_stack_size() const { return _exception_stack_size; } | |
1109 address exception_pc() const { return _exception_pc; } | |
1110 address exception_handler_pc() const { return _exception_handler_pc; } | |
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1111 int is_method_handle_exception() const { return _is_method_handle_exception; } |
0 | 1112 |
1113 void set_exception_oop(oop o) { _exception_oop = o; } | |
1114 void set_exception_pc(address a) { _exception_pc = a; } | |
1115 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } | |
1116 void set_exception_stack_size(int size) { _exception_stack_size = size; } | |
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1117 void set_is_method_handle_exception(int value) { _is_method_handle_exception = value; } |
0 | 1118 |
1119 // Stack overflow support | |
1120 inline size_t stack_available(address cur_sp); | |
1121 address stack_yellow_zone_base() | |
1122 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } | |
1123 size_t stack_yellow_zone_size() | |
1124 { return StackYellowPages * os::vm_page_size(); } | |
1125 address stack_red_zone_base() | |
1126 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } | |
1127 size_t stack_red_zone_size() | |
1128 { return StackRedPages * os::vm_page_size(); } | |
1129 bool in_stack_yellow_zone(address a) | |
1130 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } | |
1131 bool in_stack_red_zone(address a) | |
1132 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } | |
1133 | |
1134 void create_stack_guard_pages(); | |
1135 void remove_stack_guard_pages(); | |
1136 | |
1137 void enable_stack_yellow_zone(); | |
1138 void disable_stack_yellow_zone(); | |
1139 void enable_stack_red_zone(); | |
1140 void disable_stack_red_zone(); | |
1141 | |
1142 inline bool stack_yellow_zone_disabled(); | |
1143 inline bool stack_yellow_zone_enabled(); | |
1144 | |
1145 // Attempt to reguard the stack after a stack overflow may have occurred. | |
1146 // Returns true if (a) guard pages are not needed on this thread, (b) the | |
1147 // pages are already guarded, or (c) the pages were successfully reguarded. | |
1148 // Returns false if there is not enough stack space to reguard the pages, in | |
1149 // which case the caller should unwind a frame and try again. The argument | |
1150 // should be the caller's (approximate) sp. | |
1151 bool reguard_stack(address cur_sp); | |
1152 // Similar to above but see if current stackpoint is out of the guard area | |
1153 // and reguard if possible. | |
1154 bool reguard_stack(void); | |
1155 | |
1156 // Misc. accessors/mutators | |
1157 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } | |
1158 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } | |
1159 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } | |
1160 | |
1161 #ifndef PRODUCT | |
1162 void record_jump(address target, address instr, const char* file, int line); | |
1163 #endif /* PRODUCT */ | |
1164 | |
1165 // For assembly stub generation | |
1166 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } | |
1167 #ifndef PRODUCT | |
1168 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } | |
1169 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } | |
1170 #endif /* PRODUCT */ | |
1171 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } | |
1172 static ByteSize last_Java_sp_offset() { | |
1173 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); | |
1174 } | |
1175 static ByteSize last_Java_pc_offset() { | |
1176 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); | |
1177 } | |
1178 static ByteSize frame_anchor_offset() { | |
1179 return byte_offset_of(JavaThread, _anchor); | |
1180 } | |
1181 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } | |
1182 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } | |
1183 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } | |
1184 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } | |
1185 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } | |
1186 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } | |
1187 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } | |
1188 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } | |
1189 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } | |
1190 static ByteSize exception_stack_size_offset() { return byte_offset_of(JavaThread, _exception_stack_size); } | |
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1191 static ByteSize is_method_handle_exception_offset() { return byte_offset_of(JavaThread, _is_method_handle_exception); } |
0 | 1192 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } |
1193 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } | |
1194 | |
1195 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } | |
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1196 static ByteSize should_post_on_exceptions_flag_offset() { |
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1197 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); |
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1198 } |
0 | 1199 |
342 | 1200 #ifndef SERIALGC |
1201 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } | |
1202 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } | |
1203 #endif // !SERIALGC | |
1204 | |
0 | 1205 // Returns the jni environment for this thread |
1206 JNIEnv* jni_environment() { return &_jni_environment; } | |
1207 | |
1208 static JavaThread* thread_from_jni_environment(JNIEnv* env) { | |
1209 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); | |
1210 // Only return NULL if thread is off the thread list; starting to | |
1211 // exit should not return NULL. | |
1212 if (thread_from_jni_env->is_terminated()) { | |
1213 thread_from_jni_env->block_if_vm_exited(); | |
1214 return NULL; | |
1215 } else { | |
1216 return thread_from_jni_env; | |
1217 } | |
1218 } | |
1219 | |
1220 // JNI critical regions. These can nest. | |
1221 bool in_critical() { return _jni_active_critical > 0; } | |
1222 void enter_critical() { assert(Thread::current() == this, | |
1223 "this must be current thread"); | |
1224 _jni_active_critical++; } | |
1225 void exit_critical() { assert(Thread::current() == this, | |
1226 "this must be current thread"); | |
1227 _jni_active_critical--; | |
1228 assert(_jni_active_critical >= 0, | |
1229 "JNI critical nesting problem?"); } | |
1230 | |
1231 // For deadlock detection | |
1232 int depth_first_number() { return _depth_first_number; } | |
1233 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } | |
1234 | |
1235 private: | |
1236 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } | |
1237 | |
1238 public: | |
1239 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } | |
1240 void add_monitor_chunk(MonitorChunk* chunk); | |
1241 void remove_monitor_chunk(MonitorChunk* chunk); | |
1242 bool in_deopt_handler() const { return _in_deopt_handler > 0; } | |
1243 void inc_in_deopt_handler() { _in_deopt_handler++; } | |
1244 void dec_in_deopt_handler() { | |
1245 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); | |
1246 if (_in_deopt_handler > 0) { // robustness | |
1247 _in_deopt_handler--; | |
1248 } | |
1249 } | |
1250 | |
1251 private: | |
1252 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } | |
1253 | |
1254 public: | |
1255 | |
1256 // Frame iteration; calls the function f for all frames on the stack | |
1257 void frames_do(void f(frame*, const RegisterMap*)); | |
1258 | |
1259 // Memory operations | |
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1260 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 1261 |
1262 // Sweeper operations | |
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1263 void nmethods_do(CodeBlobClosure* cf); |
0 | 1264 |
1265 // Memory management operations | |
1266 void gc_epilogue(); | |
1267 void gc_prologue(); | |
1268 | |
1269 // Misc. operations | |
1270 char* name() const { return (char*)get_thread_name(); } | |
1271 void print_on(outputStream* st) const; | |
1272 void print() const { print_on(tty); } | |
1273 void print_value(); | |
1274 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; | |
1275 void print_thread_state() const PRODUCT_RETURN; | |
1276 void print_on_error(outputStream* st, char* buf, int buflen) const; | |
1277 void verify(); | |
1278 const char* get_thread_name() const; | |
1279 private: | |
1280 // factor out low-level mechanics for use in both normal and error cases | |
1281 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; | |
1282 public: | |
1283 const char* get_threadgroup_name() const; | |
1284 const char* get_parent_name() const; | |
1285 | |
1286 // Accessing frames | |
1287 frame last_frame() { | |
1288 _anchor.make_walkable(this); | |
1289 return pd_last_frame(); | |
1290 } | |
1291 javaVFrame* last_java_vframe(RegisterMap* reg_map); | |
1292 | |
1293 // Returns method at 'depth' java or native frames down the stack | |
1294 // Used for security checks | |
1295 klassOop security_get_caller_class(int depth); | |
1296 | |
1297 // Print stack trace in external format | |
1298 void print_stack_on(outputStream* st); | |
1299 void print_stack() { print_stack_on(tty); } | |
1300 | |
1301 // Print stack traces in various internal formats | |
1302 void trace_stack() PRODUCT_RETURN; | |
1303 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; | |
1304 void trace_frames() PRODUCT_RETURN; | |
1305 | |
1306 // Returns the number of stack frames on the stack | |
1307 int depth() const; | |
1308 | |
1309 // Function for testing deoptimization | |
1310 void deoptimize(); | |
1311 void make_zombies(); | |
1312 | |
1313 void deoptimized_wrt_marked_nmethods(); | |
1314 | |
1315 // Profiling operation (see fprofile.cpp) | |
1316 public: | |
1317 bool profile_last_Java_frame(frame* fr); | |
1318 | |
1319 private: | |
1320 ThreadProfiler* _thread_profiler; | |
1321 private: | |
1322 friend class FlatProfiler; // uses both [gs]et_thread_profiler. | |
1323 friend class FlatProfilerTask; // uses get_thread_profiler. | |
1324 friend class ThreadProfilerMark; // uses get_thread_profiler. | |
1325 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } | |
1326 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { | |
1327 ThreadProfiler* result = _thread_profiler; | |
1328 _thread_profiler = tp; | |
1329 return result; | |
1330 } | |
1331 | |
1332 // Static operations | |
1333 public: | |
1334 // Returns the running thread as a JavaThread | |
1335 static inline JavaThread* current(); | |
1336 | |
1337 // Returns the active Java thread. Do not use this if you know you are calling | |
1338 // from a JavaThread, as it's slower than JavaThread::current. If called from | |
1339 // the VMThread, it also returns the JavaThread that instigated the VMThread's | |
1340 // operation. You may not want that either. | |
1341 static JavaThread* active(); | |
1342 | |
1343 inline CompilerThread* as_CompilerThread(); | |
1344 | |
1345 public: | |
1346 virtual void run(); | |
1347 void thread_main_inner(); | |
1348 | |
1349 private: | |
1350 // PRIVILEGED STACK | |
1351 PrivilegedElement* _privileged_stack_top; | |
1352 GrowableArray<oop>* _array_for_gc; | |
1353 public: | |
1354 | |
1355 // Returns the privileged_stack information. | |
1356 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } | |
1357 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } | |
1358 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } | |
1359 | |
1360 public: | |
1361 // Thread local information maintained by JVMTI. | |
1362 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } | |
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1363 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() |
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1364 // getter is used to get this JavaThread's JvmtiThreadState if it has |
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1365 // one which means NULL can be returned. JvmtiThreadState::state_for() |
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1366 // is used to get the specified JavaThread's JvmtiThreadState if it has |
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1367 // one or it allocates a new JvmtiThreadState for the JavaThread and |
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1368 // returns it. JvmtiThreadState::state_for() will return NULL only if |
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1369 // the specified JavaThread is exiting. |
0 | 1370 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
1371 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } | |
1372 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } | |
1373 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } | |
1374 | |
1375 // JVMTI PopFrame support | |
1376 // Setting and clearing popframe_condition | |
1377 // All of these enumerated values are bits. popframe_pending | |
1378 // indicates that a PopFrame() has been requested and not yet been | |
1379 // completed. popframe_processing indicates that that PopFrame() is in | |
1380 // the process of being completed. popframe_force_deopt_reexecution_bit | |
1381 // indicates that special handling is required when returning to a | |
1382 // deoptimized caller. | |
1383 enum PopCondition { | |
1384 popframe_inactive = 0x00, | |
1385 popframe_pending_bit = 0x01, | |
1386 popframe_processing_bit = 0x02, | |
1387 popframe_force_deopt_reexecution_bit = 0x04 | |
1388 }; | |
1389 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } | |
1390 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } | |
1391 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } | |
1392 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } | |
1393 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } | |
1394 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } | |
1395 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } | |
1396 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } | |
1397 #ifdef CC_INTERP | |
1398 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } | |
1399 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } | |
1400 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } | |
1401 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } | |
1402 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } | |
1403 #endif | |
1404 | |
1405 private: | |
1406 // Saved incoming arguments to popped frame. | |
1407 // Used only when popped interpreted frame returns to deoptimized frame. | |
1408 void* _popframe_preserved_args; | |
1409 int _popframe_preserved_args_size; | |
1410 | |
1411 public: | |
1412 void popframe_preserve_args(ByteSize size_in_bytes, void* start); | |
1413 void* popframe_preserved_args(); | |
1414 ByteSize popframe_preserved_args_size(); | |
1415 WordSize popframe_preserved_args_size_in_words(); | |
1416 void popframe_free_preserved_args(); | |
1417 | |
1418 | |
1419 private: | |
1420 JvmtiThreadState *_jvmti_thread_state; | |
1421 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; | |
1422 | |
1423 // Used by the interpreter in fullspeed mode for frame pop, method | |
1424 // entry, method exit and single stepping support. This field is | |
1425 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. | |
1426 // It can be set to zero asynchronously (i.e., without a VM operation | |
1427 // or a lock) so we have to be very careful. | |
1428 int _interp_only_mode; | |
1429 | |
1430 public: | |
1431 // used by the interpreter for fullspeed debugging support (see above) | |
1432 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } | |
1433 bool is_interp_only_mode() { return (_interp_only_mode != 0); } | |
1434 int get_interp_only_mode() { return _interp_only_mode; } | |
1435 void increment_interp_only_mode() { ++_interp_only_mode; } | |
1436 void decrement_interp_only_mode() { --_interp_only_mode; } | |
1437 | |
1213
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1438 // support for cached flag that indicates whether exceptions need to be posted for this thread |
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1439 // if this is false, we can avoid deoptimizing when events are thrown |
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1440 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything |
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1441 private: |
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1442 int _should_post_on_exceptions_flag; |
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1443 |
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1444 public: |
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1445 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } |
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1446 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } |
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1447 |
0 | 1448 private: |
1449 ThreadStatistics *_thread_stat; | |
1450 | |
1451 public: | |
1452 ThreadStatistics* get_thread_stat() const { return _thread_stat; } | |
1453 | |
1454 // Return a blocker object for which this thread is blocked parking. | |
1455 oop current_park_blocker(); | |
1456 | |
1457 private: | |
1458 static size_t _stack_size_at_create; | |
1459 | |
1460 public: | |
1461 static inline size_t stack_size_at_create(void) { | |
1462 return _stack_size_at_create; | |
1463 } | |
1464 static inline void set_stack_size_at_create(size_t value) { | |
1465 _stack_size_at_create = value; | |
1466 } | |
1467 | |
342 | 1468 #ifndef SERIALGC |
1469 // SATB marking queue support | |
1470 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } | |
1471 static SATBMarkQueueSet& satb_mark_queue_set() { | |
1472 return _satb_mark_queue_set; | |
1473 } | |
1474 | |
1475 // Dirty card queue support | |
1476 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } | |
1477 static DirtyCardQueueSet& dirty_card_queue_set() { | |
1478 return _dirty_card_queue_set; | |
1479 } | |
1480 #endif // !SERIALGC | |
1481 | |
0 | 1482 // Machine dependent stuff |
1483 #include "incls/_thread_pd.hpp.incl" | |
1484 | |
1485 public: | |
1486 void set_blocked_on_compilation(bool value) { | |
1487 _blocked_on_compilation = value; | |
1488 } | |
1489 | |
1490 bool blocked_on_compilation() { | |
1491 return _blocked_on_compilation; | |
1492 } | |
1493 protected: | |
1494 bool _blocked_on_compilation; | |
1495 | |
1496 | |
1497 // JSR166 per-thread parker | |
1498 private: | |
1499 Parker* _parker; | |
1500 public: | |
1501 Parker* parker() { return _parker; } | |
1502 | |
1503 // Biased locking support | |
1504 private: | |
1505 GrowableArray<MonitorInfo*>* _cached_monitor_info; | |
1506 public: | |
1507 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } | |
1508 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } | |
1509 | |
1510 // clearing/querying jni attach status | |
1511 bool is_attaching() const { return _is_attaching; } | |
1512 void set_attached() { _is_attaching = false; OrderAccess::fence(); } | |
342 | 1513 private: |
1514 // This field is used to determine if a thread has claimed | |
1515 // a par_id: it is -1 if the thread has not claimed a par_id; | |
1516 // otherwise its value is the par_id that has been claimed. | |
1517 int _claimed_par_id; | |
1518 public: | |
1519 int get_claimed_par_id() { return _claimed_par_id; } | |
1520 void set_claimed_par_id(int id) { _claimed_par_id = id;} | |
0 | 1521 }; |
1522 | |
1523 // Inline implementation of JavaThread::current | |
1524 inline JavaThread* JavaThread::current() { | |
1525 Thread* thread = ThreadLocalStorage::thread(); | |
1526 assert(thread != NULL && thread->is_Java_thread(), "just checking"); | |
1527 return (JavaThread*)thread; | |
1528 } | |
1529 | |
1530 inline CompilerThread* JavaThread::as_CompilerThread() { | |
1531 assert(is_Compiler_thread(), "just checking"); | |
1532 return (CompilerThread*)this; | |
1533 } | |
1534 | |
1535 inline bool JavaThread::stack_yellow_zone_disabled() { | |
1536 return _stack_guard_state == stack_guard_yellow_disabled; | |
1537 } | |
1538 | |
1539 inline bool JavaThread::stack_yellow_zone_enabled() { | |
1540 #ifdef ASSERT | |
1541 if (os::uses_stack_guard_pages()) { | |
1542 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); | |
1543 } | |
1544 #endif | |
1545 return _stack_guard_state == stack_guard_enabled; | |
1546 } | |
1547 | |
1548 inline size_t JavaThread::stack_available(address cur_sp) { | |
1549 // This code assumes java stacks grow down | |
1550 address low_addr; // Limit on the address for deepest stack depth | |
1551 if ( _stack_guard_state == stack_guard_unused) { | |
1552 low_addr = stack_base() - stack_size(); | |
1553 } else { | |
1554 low_addr = stack_yellow_zone_base(); | |
1555 } | |
1556 return cur_sp > low_addr ? cur_sp - low_addr : 0; | |
1557 } | |
1558 | |
1559 // A JavaThread for low memory detection support | |
1560 class LowMemoryDetectorThread : public JavaThread { | |
1561 friend class VMStructs; | |
1562 public: | |
1563 LowMemoryDetectorThread(ThreadFunction entry_point) : JavaThread(entry_point) {}; | |
1564 | |
1565 // Hide this thread from external view. | |
1566 bool is_hidden_from_external_view() const { return true; } | |
1567 }; | |
1568 | |
1569 // A thread used for Compilation. | |
1570 class CompilerThread : public JavaThread { | |
1571 friend class VMStructs; | |
1572 private: | |
1573 CompilerCounters* _counters; | |
1574 | |
1575 ciEnv* _env; | |
1576 CompileLog* _log; | |
1577 CompileTask* _task; | |
1578 CompileQueue* _queue; | |
1579 | |
1580 public: | |
1581 | |
1582 static CompilerThread* current(); | |
1583 | |
1584 CompilerThread(CompileQueue* queue, CompilerCounters* counters); | |
1585 | |
1586 bool is_Compiler_thread() const { return true; } | |
1587 // Hide this compiler thread from external view. | |
1588 bool is_hidden_from_external_view() const { return true; } | |
1589 | |
1590 CompileQueue* queue() { return _queue; } | |
1591 CompilerCounters* counters() { return _counters; } | |
1592 | |
1593 // Get/set the thread's compilation environment. | |
1594 ciEnv* env() { return _env; } | |
1595 void set_env(ciEnv* env) { _env = env; } | |
1596 | |
1597 // Get/set the thread's logging information | |
1598 CompileLog* log() { return _log; } | |
1599 void init_log(CompileLog* log) { | |
1600 // Set once, for good. | |
1601 assert(_log == NULL, "set only once"); | |
1602 _log = log; | |
1603 } | |
1604 | |
1605 #ifndef PRODUCT | |
1606 private: | |
1607 IdealGraphPrinter *_ideal_graph_printer; | |
1608 public: | |
1609 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } | |
1610 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } | |
1611 #endif | |
1612 | |
1613 // Get/set the thread's current task | |
1614 CompileTask* task() { return _task; } | |
1615 void set_task(CompileTask* task) { _task = task; } | |
1616 }; | |
1617 | |
1618 inline CompilerThread* CompilerThread::current() { | |
1619 return JavaThread::current()->as_CompilerThread(); | |
1620 } | |
1621 | |
1622 | |
1623 // The active thread queue. It also keeps track of the current used | |
1624 // thread priorities. | |
1625 class Threads: AllStatic { | |
1626 friend class VMStructs; | |
1627 private: | |
1628 static JavaThread* _thread_list; | |
1629 static int _number_of_threads; | |
1630 static int _number_of_non_daemon_threads; | |
1631 static int _return_code; | |
1632 | |
1633 public: | |
1634 // Thread management | |
1635 // force_daemon is a concession to JNI, where we may need to add a | |
1636 // thread to the thread list before allocating its thread object | |
1637 static void add(JavaThread* p, bool force_daemon = false); | |
1638 static void remove(JavaThread* p); | |
1639 static bool includes(JavaThread* p); | |
1640 static JavaThread* first() { return _thread_list; } | |
1641 static void threads_do(ThreadClosure* tc); | |
1642 | |
1643 // Initializes the vm and creates the vm thread | |
1644 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); | |
1645 static void convert_vm_init_libraries_to_agents(); | |
1646 static void create_vm_init_libraries(); | |
1647 static void create_vm_init_agents(); | |
1648 static void shutdown_vm_agents(); | |
1649 static bool destroy_vm(); | |
1650 // Supported VM versions via JNI | |
1651 // Includes JNI_VERSION_1_1 | |
1652 static jboolean is_supported_jni_version_including_1_1(jint version); | |
1653 // Does not include JNI_VERSION_1_1 | |
1654 static jboolean is_supported_jni_version(jint version); | |
1655 | |
1656 // Garbage collection | |
1657 static void follow_other_roots(void f(oop*)); | |
1658 | |
1659 // Apply "f->do_oop" to all root oops in all threads. | |
1660 // This version may only be called by sequential code. | |
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1661 static void oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 1662 // This version may be called by sequential or parallel code. |
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1663 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 1664 // This creates a list of GCTasks, one per thread. |
1665 static void create_thread_roots_tasks(GCTaskQueue* q); | |
1666 // This creates a list of GCTasks, one per thread, for marking objects. | |
1667 static void create_thread_roots_marking_tasks(GCTaskQueue* q); | |
1668 | |
1669 // Apply "f->do_oop" to roots in all threads that | |
1670 // are part of compiled frames | |
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1671 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 1672 |
1673 static void convert_hcode_pointers(); | |
1674 static void restore_hcode_pointers(); | |
1675 | |
1676 // Sweeper | |
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1677 static void nmethods_do(CodeBlobClosure* cf); |
0 | 1678 |
1679 static void gc_epilogue(); | |
1680 static void gc_prologue(); | |
1681 | |
1682 // Verification | |
1683 static void verify(); | |
1684 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); | |
1685 static void print(bool print_stacks, bool internal_format) { | |
1686 // this function is only used by debug.cpp | |
1687 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); | |
1688 } | |
1689 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); | |
1690 | |
1691 // Get Java threads that are waiting to enter a monitor. If doLock | |
1692 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
1693 // VM needs to be at a safepoint. | |
1694 static GrowableArray<JavaThread*>* get_pending_threads(int count, | |
1695 address monitor, bool doLock); | |
1696 | |
1697 // Get owning Java thread from the monitor's owner field. If doLock | |
1698 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
1699 // VM needs to be at a safepoint. | |
1700 static JavaThread *owning_thread_from_monitor_owner(address owner, | |
1701 bool doLock); | |
1702 | |
1703 // Number of threads on the active threads list | |
1704 static int number_of_threads() { return _number_of_threads; } | |
1705 // Number of non-daemon threads on the active threads list | |
1706 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } | |
1707 | |
1708 // Deoptimizes all frames tied to marked nmethods | |
1709 static void deoptimized_wrt_marked_nmethods(); | |
1710 | |
1711 }; | |
1712 | |
1713 | |
1714 // Thread iterator | |
1715 class ThreadClosure: public StackObj { | |
1716 public: | |
1717 virtual void do_thread(Thread* thread) = 0; | |
1718 }; | |
1719 | |
1720 class SignalHandlerMark: public StackObj { | |
1721 private: | |
1722 Thread* _thread; | |
1723 public: | |
1724 SignalHandlerMark(Thread* t) { | |
1725 _thread = t; | |
1726 if (_thread) _thread->enter_signal_handler(); | |
1727 } | |
1728 ~SignalHandlerMark() { | |
1729 if (_thread) _thread->leave_signal_handler(); | |
1730 _thread = NULL; | |
1731 } | |
1732 }; | |
1733 | |
1734 // ParkEvents are type-stable and immortal. | |
1735 // | |
1736 // Lifecycle: Once a ParkEvent is associated with a thread that ParkEvent remains | |
1737 // associated with the thread for the thread's entire lifetime - the relationship is | |
1738 // stable. A thread will be associated at most one ParkEvent. When the thread | |
1739 // expires, the ParkEvent moves to the EventFreeList. New threads attempt to allocate from | |
1740 // the EventFreeList before creating a new Event. Type-stability frees us from | |
1741 // worrying about stale Event or Thread references in the objectMonitor subsystem. | |
1742 // (A reference to ParkEvent is always valid, even though the event may no longer be associated | |
1743 // with the desired or expected thread. A key aspect of this design is that the callers of | |
1744 // park, unpark, etc must tolerate stale references and spurious wakeups). | |
1745 // | |
1746 // Only the "associated" thread can block (park) on the ParkEvent, although | |
1747 // any other thread can unpark a reachable parkevent. Park() is allowed to | |
1748 // return spuriously. In fact park-unpark a really just an optimization to | |
1749 // avoid unbounded spinning and surrender the CPU to be a polite system citizen. | |
1750 // A degenerate albeit "impolite" park-unpark implementation could simply return. | |
1751 // See http://blogs.sun.com/dave for more details. | |
1752 // | |
1753 // Eventually I'd like to eliminate Events and ObjectWaiters, both of which serve as | |
1754 // thread proxies, and simply make the THREAD structure type-stable and persistent. | |
1755 // Currently, we unpark events associated with threads, but ideally we'd just | |
1756 // unpark threads. | |
1757 // | |
1758 // The base-class, PlatformEvent, is platform-specific while the ParkEvent is | |
1759 // platform-independent. PlatformEvent provides park(), unpark(), etc., and | |
1760 // is abstract -- that is, a PlatformEvent should never be instantiated except | |
1761 // as part of a ParkEvent. | |
1762 // Equivalently we could have defined a platform-independent base-class that | |
1763 // exported Allocate(), Release(), etc. The platform-specific class would extend | |
1764 // that base-class, adding park(), unpark(), etc. | |
1765 // | |
1766 // A word of caution: The JVM uses 2 very similar constructs: | |
1767 // 1. ParkEvent are used for Java-level "monitor" synchronization. | |
1768 // 2. Parkers are used by JSR166-JUC park-unpark. | |
1769 // | |
1770 // We'll want to eventually merge these redundant facilities and use ParkEvent. | |
1771 | |
1772 | |
1773 class ParkEvent : public os::PlatformEvent { | |
1774 private: | |
1775 ParkEvent * FreeNext ; | |
1776 | |
1777 // Current association | |
1778 Thread * AssociatedWith ; | |
1779 intptr_t RawThreadIdentity ; // LWPID etc | |
1780 volatile int Incarnation ; | |
1781 | |
1782 // diagnostic : keep track of last thread to wake this thread. | |
1783 // this is useful for construction of dependency graphs. | |
1784 void * LastWaker ; | |
1785 | |
1786 public: | |
1787 // MCS-CLH list linkage and Native Mutex/Monitor | |
1788 ParkEvent * volatile ListNext ; | |
1789 ParkEvent * volatile ListPrev ; | |
1790 volatile intptr_t OnList ; | |
1791 volatile int TState ; | |
1792 volatile int Notified ; // for native monitor construct | |
1793 volatile int IsWaiting ; // Enqueued on WaitSet | |
1794 | |
1795 | |
1796 private: | |
1797 static ParkEvent * volatile FreeList ; | |
1798 static volatile int ListLock ; | |
1799 | |
1800 // It's prudent to mark the dtor as "private" | |
1801 // ensuring that it's not visible outside the package. | |
1802 // Unfortunately gcc warns about such usage, so | |
1803 // we revert to the less desirable "protected" visibility. | |
1804 // The other compilers accept private dtors. | |
1805 | |
1806 protected: // Ensure dtor is never invoked | |
1807 ~ParkEvent() { guarantee (0, "invariant") ; } | |
1808 | |
1809 ParkEvent() : PlatformEvent() { | |
1810 AssociatedWith = NULL ; | |
1811 FreeNext = NULL ; | |
1812 ListNext = NULL ; | |
1813 ListPrev = NULL ; | |
1814 OnList = 0 ; | |
1815 TState = 0 ; | |
1816 Notified = 0 ; | |
1817 IsWaiting = 0 ; | |
1818 } | |
1819 | |
1820 // We use placement-new to force ParkEvent instances to be | |
1821 // aligned on 256-byte address boundaries. This ensures that the least | |
1822 // significant byte of a ParkEvent address is always 0. | |
1823 | |
1824 void * operator new (size_t sz) ; | |
1825 void operator delete (void * a) ; | |
1826 | |
1827 public: | |
1828 static ParkEvent * Allocate (Thread * t) ; | |
1829 static void Release (ParkEvent * e) ; | |
1830 } ; |