1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP
26 #define SHARE_VM_RUNTIME_THREAD_HPP
27
28 #include "memory/allocation.hpp"
29 #include "memory/threadLocalAllocBuffer.hpp"
30 #include "oops/oop.hpp"
31 #include "prims/jni.h"
32 #include "prims/jvmtiExport.hpp"
33 #include "runtime/frame.hpp"
34 #include "runtime/javaFrameAnchor.hpp"
35 #include "runtime/jniHandles.hpp"
36 #include "runtime/mutexLocker.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/osThread.hpp"
39 #include "runtime/park.hpp"
40 #include "runtime/safepoint.hpp"
41 #include "runtime/stubRoutines.hpp"
42 #include "runtime/threadLocalStorage.hpp"
43 #include "runtime/unhandledOops.hpp"
44 #include "utilities/macros.hpp"
45
46 #if INCLUDE_NMT
47 #include "services/memRecorder.hpp"
48 #endif // INCLUDE_NMT
49
50 #include "trace/traceBackend.hpp"
51 #include "trace/traceMacros.hpp"
52 #include "utilities/exceptions.hpp"
53 #include "utilities/top.hpp"
54 #if INCLUDE_ALL_GCS
55 #include "gc_implementation/g1/dirtyCardQueue.hpp"
56 #include "gc_implementation/g1/satbQueue.hpp"
57 #endif // INCLUDE_ALL_GCS
58 #ifdef ZERO
59 #ifdef TARGET_ARCH_zero
60 # include "stack_zero.hpp"
61 #endif
62 #endif
63
64 class ThreadSafepointState;
65 class ThreadProfiler;
66
67 class JvmtiThreadState;
68 class JvmtiGetLoadedClassesClosure;
69 class ThreadStatistics;
70 class ConcurrentLocksDump;
71 class ParkEvent;
72 class Parker;
73
74 class ciEnv;
75 class CompileThread;
76 class CompileLog;
77 class CompileTask;
78 class CompileQueue;
79 class CompilerCounters;
80 class vframeArray;
81
82 class DeoptResourceMark;
83 class jvmtiDeferredLocalVariableSet;
84
85 class GCTaskQueue;
86 class ThreadClosure;
87 class IdealGraphPrinter;
88
89 DEBUG_ONLY(class ResourceMark;)
90
91 class WorkerThread;
92
93 // Class hierarchy
94 // - Thread
95 // - NamedThread
96 // - VMThread
97 // - ConcurrentGCThread
98 // - WorkerThread
99 // - GangWorker
100 // - GCTaskThread
101 // - JavaThread
102 // - WatcherThread
103
104 class Thread: public ThreadShadow {
105 friend class VMStructs;
106 private:
107 // Exception handling
108 // (Note: _pending_exception and friends are in ThreadShadow)
109 //oop _pending_exception; // pending exception for current thread
110 // const char* _exception_file; // file information for exception (debugging only)
111 // int _exception_line; // line information for exception (debugging only)
112 protected:
113 // Support for forcing alignment of thread objects for biased locking
114 void* _real_malloc_address;
115 public:
116 void* operator new(size_t size) throw() { return allocate(size, true); }
117 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
118 return allocate(size, false); }
119 void operator delete(void* p);
120
121 protected:
122 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);
123 private:
124
125 // ***************************************************************
126 // Suspend and resume support
127 // ***************************************************************
128 //
129 // VM suspend/resume no longer exists - it was once used for various
130 // things including safepoints but was deprecated and finally removed
131 // in Java 7. Because VM suspension was considered "internal" Java-level
132 // suspension was considered "external", and this legacy naming scheme
133 // remains.
134 //
135 // External suspend/resume requests come from JVM_SuspendThread,
136 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
137 // ResumeThread. External
138 // suspend requests cause _external_suspend to be set and external
139 // resume requests cause _external_suspend to be cleared.
140 // External suspend requests do not nest on top of other external
141 // suspend requests. The higher level APIs reject suspend requests
142 // for already suspended threads.
143 //
144 // The external_suspend
145 // flag is checked by has_special_runtime_exit_condition() and java thread
146 // will self-suspend when handle_special_runtime_exit_condition() is
147 // called. Most uses of the _thread_blocked state in JavaThreads are
148 // considered the same as being externally suspended; if the blocking
149 // condition lifts, the JavaThread will self-suspend. Other places
150 // where VM checks for external_suspend include:
151 // + mutex granting (do not enter monitors when thread is suspended)
152 // + state transitions from _thread_in_native
153 //
154 // In general, java_suspend() does not wait for an external suspend
155 // request to complete. When it returns, the only guarantee is that
156 // the _external_suspend field is true.
157 //
158 // wait_for_ext_suspend_completion() is used to wait for an external
159 // suspend request to complete. External suspend requests are usually
160 // followed by some other interface call that requires the thread to
161 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
162 // the interface that requires quiescence, we give the JavaThread a
163 // chance to self-suspend before we need it to be quiescent. This
164 // improves overall suspend/query performance.
165 //
166 // _suspend_flags controls the behavior of java_ suspend/resume.
167 // It must be set under the protection of SR_lock. Read from the flag is
168 // OK without SR_lock as long as the value is only used as a hint.
169 // (e.g., check _external_suspend first without lock and then recheck
170 // inside SR_lock and finish the suspension)
171 //
172 // _suspend_flags is also overloaded for other "special conditions" so
173 // that a single check indicates whether any special action is needed
174 // eg. for async exceptions.
175 // -------------------------------------------------------------------
176 // Notes:
177 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
178 // but we still update its value to keep other part of the system (mainly
179 // JVMTI) happy. ThreadState is legacy code (see notes in
180 // osThread.hpp).
181 //
182 // 2. It would be more natural if set_external_suspend() is private and
183 // part of java_suspend(), but that probably would affect the suspend/query
184 // performance. Need more investigation on this.
185 //
186
187 // suspend/resume lock: used for self-suspend
188 Monitor* _SR_lock;
189
190 protected:
191 enum SuspendFlags {
192 // NOTE: avoid using the sign-bit as cc generates different test code
193 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
194
195 _external_suspend = 0x20000000U, // thread is asked to self suspend
196 _ext_suspended = 0x40000000U, // thread has self-suspended
197 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
198
199 _has_async_exception = 0x00000001U, // there is a pending async exception
200 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock
201 };
202
203 // various suspension related flags - atomically updated
204 // overloaded for async exception checking in check_special_condition_for_native_trans.
205 volatile uint32_t _suspend_flags;
206
207 private:
208 int _num_nested_signal;
209
210 public:
211 void enter_signal_handler() { _num_nested_signal++; }
212 void leave_signal_handler() { _num_nested_signal--; }
213 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
214
215 private:
216 // Debug tracing
217 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
218
219 // Active_handles points to a block of handles
220 JNIHandleBlock* _active_handles;
221
222 // One-element thread local free list
223 JNIHandleBlock* _free_handle_block;
224
225 // Point to the last handle mark
226 HandleMark* _last_handle_mark;
227
228 // The parity of the last strong_roots iteration in which this thread was
229 // claimed as a task.
230 jint _oops_do_parity;
231
232 public:
233 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
234 HandleMark* last_handle_mark() const { return _last_handle_mark; }
235 private:
236
237 // debug support for checking if code does allow safepoints or not
238 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
239 // mutex, or blocking on an object synchronizer (Java locking).
240 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
241 // If !allow_allocation(), then an assertion failure will happen during allocation
242 // (Hence, !allow_safepoint() => !allow_allocation()).
243 //
244 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
245 //
246 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
247 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
248
249 // Used by SkipGCALot class.
250 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
251
252 friend class No_Alloc_Verifier;
253 friend class No_Safepoint_Verifier;
254 friend class Pause_No_Safepoint_Verifier;
255 friend class ThreadLocalStorage;
256 friend class GC_locker;
257
258 ThreadLocalAllocBuffer _tlab; // Thread-local eden
259 jlong _allocated_bytes; // Cumulative number of bytes allocated on
260 // the Java heap
261
262 TRACE_DATA _trace_data; // Thread-local data for tracing
263
264 int _vm_operation_started_count; // VM_Operation support
265 int _vm_operation_completed_count; // VM_Operation support
266
267 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
268 // is waiting to lock
269 bool _current_pending_monitor_is_from_java; // locking is from Java code
270
271 // ObjectMonitor on which this thread called Object.wait()
272 ObjectMonitor* _current_waiting_monitor;
273
274 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
275 public:
276 ObjectMonitor* omFreeList;
277 int omFreeCount; // length of omFreeList
278 int omFreeProvision; // reload chunk size
279 ObjectMonitor* omInUseList; // SLL to track monitors in circulation
280 int omInUseCount; // length of omInUseList
281
282 #ifdef ASSERT
283 private:
284 bool _visited_for_critical_count;
285
286 public:
287 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }
288 bool was_visited_for_critical_count() const { return _visited_for_critical_count; }
289 #endif
290
291 public:
292 enum {
293 is_definitely_current_thread = true
294 };
295
296 // Constructor
297 Thread();
298 virtual ~Thread();
299
300 // initializtion
301 void initialize_thread_local_storage();
302
303 // thread entry point
304 virtual void run();
305
306 // Testers
307 virtual bool is_VM_thread() const { return false; }
308 virtual bool is_Java_thread() const { return false; }
309 virtual bool is_Compiler_thread() const { return false; }
310 virtual bool is_hidden_from_external_view() const { return false; }
311 virtual bool is_jvmti_agent_thread() const { return false; }
312 // True iff the thread can perform GC operations at a safepoint.
313 // Generally will be true only of VM thread and parallel GC WorkGang
314 // threads.
315 virtual bool is_GC_task_thread() const { return false; }
316 virtual bool is_Watcher_thread() const { return false; }
317 virtual bool is_ConcurrentGC_thread() const { return false; }
318 virtual bool is_Named_thread() const { return false; }
319 virtual bool is_Worker_thread() const { return false; }
320
321 // Casts
322 virtual WorkerThread* as_Worker_thread() const { return NULL; }
323
324 virtual char* name() const { return (char*)"Unknown thread"; }
325
326 // Returns the current thread
327 static inline Thread* current();
328
329 // Common thread operations
330 static void set_priority(Thread* thread, ThreadPriority priority);
331 static ThreadPriority get_priority(const Thread* const thread);
332 static void start(Thread* thread);
333 static void interrupt(Thread* thr);
334 static bool is_interrupted(Thread* thr, bool clear_interrupted);
335
336 void set_native_thread_name(const char *name) {
337 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
338 os::set_native_thread_name(name);
339 }
340
341 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
342 Monitor* SR_lock() const { return _SR_lock; }
343
344 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
345
346 void set_suspend_flag(SuspendFlags f) {
347 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
348 uint32_t flags;
349 do {
350 flags = _suspend_flags;
351 }
352 while (Atomic::cmpxchg((jint)(flags | f),
353 (volatile jint*)&_suspend_flags,
354 (jint)flags) != (jint)flags);
355 }
356 void clear_suspend_flag(SuspendFlags f) {
357 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
358 uint32_t flags;
359 do {
360 flags = _suspend_flags;
361 }
362 while (Atomic::cmpxchg((jint)(flags & ~f),
363 (volatile jint*)&_suspend_flags,
364 (jint)flags) != (jint)flags);
365 }
366
367 void set_has_async_exception() {
368 set_suspend_flag(_has_async_exception);
369 }
370 void clear_has_async_exception() {
371 clear_suspend_flag(_has_async_exception);
372 }
373
374 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }
375
376 void set_critical_native_unlock() {
377 set_suspend_flag(_critical_native_unlock);
378 }
379 void clear_critical_native_unlock() {
380 clear_suspend_flag(_critical_native_unlock);
381 }
382
383 // Support for Unhandled Oop detection
384 #ifdef CHECK_UNHANDLED_OOPS
385 private:
386 UnhandledOops* _unhandled_oops;
387 public:
388 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
389 // Mark oop safe for gc. It may be stack allocated but won't move.
390 void allow_unhandled_oop(oop *op) {
391 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
392 }
393 // Clear oops at safepoint so crashes point to unhandled oop violator
394 void clear_unhandled_oops() {
395 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
396 }
397 #endif // CHECK_UNHANDLED_OOPS
398
399 #ifndef PRODUCT
400 bool skip_gcalot() { return _skip_gcalot; }
401 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
402 #endif
403
404 public:
405 // Installs a pending exception to be inserted later
406 static void send_async_exception(oop thread_oop, oop java_throwable);
407
408 // Resource area
409 ResourceArea* resource_area() const { return _resource_area; }
410 void set_resource_area(ResourceArea* area) { _resource_area = area; }
411
412 OSThread* osthread() const { return _osthread; }
413 void set_osthread(OSThread* thread) { _osthread = thread; }
414
415 // JNI handle support
416 JNIHandleBlock* active_handles() const { return _active_handles; }
417 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
418 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
419 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
420
421 // Internal handle support
422 HandleArea* handle_area() const { return _handle_area; }
423 void set_handle_area(HandleArea* area) { _handle_area = area; }
424
425 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; }
426 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; }
427
428 // Thread-Local Allocation Buffer (TLAB) support
429 ThreadLocalAllocBuffer& tlab() { return _tlab; }
430 void initialize_tlab() {
431 if (UseTLAB) {
432 tlab().initialize();
433 }
434 }
435
436 jlong allocated_bytes() { return _allocated_bytes; }
437 void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
438 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }
439 inline jlong cooked_allocated_bytes();
440
441 TRACE_DATA* trace_data() { return &_trace_data; }
442
443 // VM operation support
444 int vm_operation_ticket() { return ++_vm_operation_started_count; }
445 int vm_operation_completed_count() { return _vm_operation_completed_count; }
446 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
447
448 // For tracking the heavyweight monitor the thread is pending on.
449 ObjectMonitor* current_pending_monitor() {
450 return _current_pending_monitor;
451 }
452 void set_current_pending_monitor(ObjectMonitor* monitor) {
453 _current_pending_monitor = monitor;
454 }
455 void set_current_pending_monitor_is_from_java(bool from_java) {
456 _current_pending_monitor_is_from_java = from_java;
457 }
458 bool current_pending_monitor_is_from_java() {
459 return _current_pending_monitor_is_from_java;
460 }
461
462 // For tracking the ObjectMonitor on which this thread called Object.wait()
463 ObjectMonitor* current_waiting_monitor() {
464 return _current_waiting_monitor;
465 }
466 void set_current_waiting_monitor(ObjectMonitor* monitor) {
467 _current_waiting_monitor = monitor;
468 }
469
470 // GC support
471 // Apply "f->do_oop" to all root oops in "this".
472 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive.
473 // Used by JavaThread::oops_do.
474 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
475 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
476
477 // Handles the parallel case for the method below.
478 private:
479 bool claim_oops_do_par_case(int collection_parity);
480 public:
481 // Requires that "collection_parity" is that of the current strong roots
482 // iteration. If "is_par" is false, sets the parity of "this" to
483 // "collection_parity", and returns "true". If "is_par" is true,
484 // uses an atomic instruction to set the current threads parity to
485 // "collection_parity", if it is not already. Returns "true" iff the
486 // calling thread does the update, this indicates that the calling thread
487 // has claimed the thread's stack as a root groop in the current
488 // collection.
489 bool claim_oops_do(bool is_par, int collection_parity) {
490 if (!is_par) {
491 _oops_do_parity = collection_parity;
492 return true;
493 } else {
494 return claim_oops_do_par_case(collection_parity);
495 }
496 }
497
498 // Sweeper support
499 void nmethods_do(CodeBlobClosure* cf);
500
501 // jvmtiRedefineClasses support
502 void metadata_do(void f(Metadata*));
503
504 // Used by fast lock support
505 virtual bool is_lock_owned(address adr) const;
506
507 // Check if address is in the stack of the thread (not just for locks).
508 // Warning: the method can only be used on the running thread
509 bool is_in_stack(address adr) const;
510 // Check if address is in the usable part of the stack (excludes protected
511 // guard pages)
512 bool is_in_usable_stack(address adr) const;
513
514 // Sets this thread as starting thread. Returns failure if thread
515 // creation fails due to lack of memory, too many threads etc.
516 bool set_as_starting_thread();
517
518 protected:
519 // OS data associated with the thread
520 OSThread* _osthread; // Platform-specific thread information
521
522 // Thread local resource area for temporary allocation within the VM
523 ResourceArea* _resource_area;
524
525 DEBUG_ONLY(ResourceMark* _current_resource_mark;)
526
527 // Thread local handle area for allocation of handles within the VM
528 HandleArea* _handle_area;
529 GrowableArray<Metadata*>* _metadata_handles;
530
531 // Support for stack overflow handling, get_thread, etc.
532 address _stack_base;
533 size_t _stack_size;
534 uintptr_t _self_raw_id; // used by get_thread (mutable)
535 int _lgrp_id;
536
537 public:
538 // Stack overflow support
539 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
540
541 void set_stack_base(address base) { _stack_base = base; }
542 size_t stack_size() const { return _stack_size; }
543 void set_stack_size(size_t size) { _stack_size = size; }
544 void record_stack_base_and_size();
545
546 bool on_local_stack(address adr) const {
547 /* QQQ this has knowledge of direction, ought to be a stack method */
548 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
549 }
550
551 uintptr_t self_raw_id() { return _self_raw_id; }
552 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }
553
554 int lgrp_id() const { return _lgrp_id; }
555 void set_lgrp_id(int value) { _lgrp_id = value; }
556
557 // Printing
558 virtual void print_on(outputStream* st) const;
559 void print() const { print_on(tty); }
560 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
561
562 // Debug-only code
563 #ifdef ASSERT
564 private:
565 // Deadlock detection support for Mutex locks. List of locks own by thread.
566 Monitor* _owned_locks;
567 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
568 // thus the friendship
569 friend class Mutex;
570 friend class Monitor;
571
572 public:
573 void print_owned_locks_on(outputStream* st) const;
574 void print_owned_locks() const { print_owned_locks_on(tty); }
575 Monitor* owned_locks() const { return _owned_locks; }
576 bool owns_locks() const { return owned_locks() != NULL; }
577 bool owns_locks_but_compiled_lock() const;
578
579 // Deadlock detection
580 bool allow_allocation() { return _allow_allocation_count == 0; }
581 ResourceMark* current_resource_mark() { return _current_resource_mark; }
582 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
583 #endif
584
585 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
586
587 private:
588 volatile int _jvmti_env_iteration_count;
589
590 public:
591 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
592 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
593 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
594
595 // Code generation
596 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
597 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
598 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
599
600 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
601 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
602
603 #define TLAB_FIELD_OFFSET(name) \
604 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
605
606 TLAB_FIELD_OFFSET(start)
607 TLAB_FIELD_OFFSET(end)
608 TLAB_FIELD_OFFSET(top)
609 TLAB_FIELD_OFFSET(pf_top)
610 TLAB_FIELD_OFFSET(size) // desired_size
611 TLAB_FIELD_OFFSET(refill_waste_limit)
612 TLAB_FIELD_OFFSET(number_of_refills)
613 TLAB_FIELD_OFFSET(fast_refill_waste)
614 TLAB_FIELD_OFFSET(slow_allocations)
615
616 #undef TLAB_FIELD_OFFSET
617
618 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }
619
620 public:
621 volatile intptr_t _Stalled ;
622 volatile int _TypeTag ;
623 ParkEvent * _ParkEvent ; // for synchronized()
624 ParkEvent * _SleepEvent ; // for Thread.sleep
625 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
626 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
627 int NativeSyncRecursion ; // diagnostic
628
629 volatile int _OnTrap ; // Resume-at IP delta
630 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
631 jint _hashStateX ; // thread-specific hashCode generator state
632 jint _hashStateY ;
633 jint _hashStateZ ;
634 void * _schedctl ;
635
636
637 volatile jint rng [4] ; // RNG for spin loop
638
639 // Low-level leaf-lock primitives used to implement synchronization
640 // and native monitor-mutex infrastructure.
641 // Not for general synchronization use.
642 static void SpinAcquire (volatile int * Lock, const char * Name) ;
643 static void SpinRelease (volatile int * Lock) ;
644 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
645 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
646 static void muxRelease (volatile intptr_t * Lock) ;
647 };
648
649 // Inline implementation of Thread::current()
650 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
651 // startup.
652 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
653 // period. This is inlined in thread_<os_family>.inline.hpp.
654
655 inline Thread* Thread::current() {
656 #ifdef ASSERT
657 // This function is very high traffic. Define PARANOID to enable expensive
658 // asserts.
659 #ifdef PARANOID
660 // Signal handler should call ThreadLocalStorage::get_thread_slow()
661 Thread* t = ThreadLocalStorage::get_thread_slow();
662 assert(t != NULL && !t->is_inside_signal_handler(),
663 "Don't use Thread::current() inside signal handler");
664 #endif
665 #endif
666 Thread* thread = ThreadLocalStorage::thread();
667 assert(thread != NULL, "just checking");
668 return thread;
669 }
670
671 // Name support for threads. non-JavaThread subclasses with multiple
672 // uniquely named instances should derive from this.
673 class NamedThread: public Thread {
674 friend class VMStructs;
675 enum {
676 max_name_len = 64
677 };
678 private:
679 char* _name;
680 // log JavaThread being processed by oops_do
681 JavaThread* _processed_thread;
682
683 public:
684 NamedThread();
685 ~NamedThread();
686 // May only be called once per thread.
687 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
688 virtual bool is_Named_thread() const { return true; }
689 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
690 JavaThread *processed_thread() { return _processed_thread; }
691 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
692 virtual void print_on(outputStream* st) const;
693 };
694
695 // Worker threads are named and have an id of an assigned work.
696 class WorkerThread: public NamedThread {
697 private:
698 uint _id;
699 public:
700 WorkerThread() : _id(0) { }
701 virtual bool is_Worker_thread() const { return true; }
702
703 virtual WorkerThread* as_Worker_thread() const {
704 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");
705 return (WorkerThread*) this;
706 }
707
708 void set_id(uint work_id) { _id = work_id; }
709 uint id() const { return _id; }
710 };
711
712 // A single WatcherThread is used for simulating timer interrupts.
713 class WatcherThread: public Thread {
714 friend class VMStructs;
715 public:
716 virtual void run();
717
718 private:
719 static WatcherThread* _watcher_thread;
720
721 static bool _startable;
722 volatile static bool _should_terminate; // updated without holding lock
723
724 os::WatcherThreadCrashProtection* _crash_protection;
725 public:
726 enum SomeConstants {
727 delay_interval = 10 // interrupt delay in milliseconds
728 };
729
730 // Constructor
731 WatcherThread();
732
733 // Tester
734 bool is_Watcher_thread() const { return true; }
735
736 // Printing
737 char* name() const { return (char*)"VM Periodic Task Thread"; }
738 void print_on(outputStream* st) const;
739 void unpark();
740
741 // Returns the single instance of WatcherThread
742 static WatcherThread* watcher_thread() { return _watcher_thread; }
743
744 // Create and start the single instance of WatcherThread, or stop it on shutdown
745 static void start();
746 static void stop();
747 // Only allow start once the VM is sufficiently initialized
748 // Otherwise the first task to enroll will trigger the start
749 static void make_startable();
750
751 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) {
752 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread");
753 _crash_protection = crash_protection;
754 }
755
756 bool has_crash_protection() const { return _crash_protection != NULL; }
757 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; }
758
759 private:
760 int sleep() const;
761 };
762
763
764 class CompilerThread;
765
766 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
767
768 class JavaThread: public Thread {
769 friend class VMStructs;
770 private:
771 JavaThread* _next; // The next thread in the Threads list
772 oop _threadObj; // The Java level thread object
773
774 #ifdef ASSERT
775 private:
776 int _java_call_counter;
777
778 public:
779 int java_call_counter() { return _java_call_counter; }
780 void inc_java_call_counter() { _java_call_counter++; }
781 void dec_java_call_counter() {
782 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
783 _java_call_counter--;
784 }
785 private: // restore original namespace restriction
786 #endif // ifdef ASSERT
787
788 #ifndef PRODUCT
789 public:
790 enum {
791 jump_ring_buffer_size = 16
792 };
793 private: // restore original namespace restriction
794 #endif
795
796 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
797
798 ThreadFunction _entry_point;
799
800 JNIEnv _jni_environment;
801
802 // Deopt support
803 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
804
805 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
806 // transition out of native
807 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
808 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
809 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
810 // Because deoptimization is lazy we must save jvmti requests to set locals
811 // in compiled frames until we deoptimize and we have an interpreter frame.
812 // This holds the pointer to array (yeah like there might be more than one) of
813 // description of compiled vframes that have locals that need to be updated.
814 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
815
816 // Handshake value for fixing 6243940. We need a place for the i2c
817 // adapter to store the callee Method*. This value is NEVER live
818 // across a gc point so it does NOT have to be gc'd
819 // The handshake is open ended since we can't be certain that it will
820 // be NULLed. This is because we rarely ever see the race and end up
821 // in handle_wrong_method which is the backend of the handshake. See
822 // code in i2c adapters and handle_wrong_method.
823
824 Method* _callee_target;
825
826 // Used to pass back results to the interpreter or generated code running Java code.
827 oop _vm_result; // oop result is GC-preserved
828 Metadata* _vm_result_2; // non-oop result
829
830 // See ReduceInitialCardMarks: this holds the precise space interval of
831 // the most recent slow path allocation for which compiled code has
832 // elided card-marks for performance along the fast-path.
833 MemRegion _deferred_card_mark;
834
835 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
836 // allocated during deoptimization
837 // and by JNI_MonitorEnter/Exit
838
839 // Async. requests support
840 enum AsyncRequests {
841 _no_async_condition = 0,
842 _async_exception,
843 _async_unsafe_access_error
844 };
845 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
846 oop _pending_async_exception;
847
848 // Safepoint support
849 public: // Expose _thread_state for SafeFetchInt()
850 volatile JavaThreadState _thread_state;
851 private:
852 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
853 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
854
855 // JavaThread termination support
856 enum TerminatedTypes {
857 _not_terminated = 0xDEAD - 2,
858 _thread_exiting, // JavaThread::exit() has been called for this thread
859 _thread_terminated, // JavaThread is removed from thread list
860 _vm_exited // JavaThread is still executing native code, but VM is terminated
861 // only VM_Exit can set _vm_exited
862 };
863
864 // In general a JavaThread's _terminated field transitions as follows:
865 //
866 // _not_terminated => _thread_exiting => _thread_terminated
867 //
868 // _vm_exited is a special value to cover the case of a JavaThread
869 // executing native code after the VM itself is terminated.
870 volatile TerminatedTypes _terminated;
871 // suspend/resume support
872 volatile bool _suspend_equivalent; // Suspend equivalent condition
873 jint _in_deopt_handler; // count of deoptimization
874 // handlers thread is in
875 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
876 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
877 // never locked) when throwing an exception. Used by interpreter only.
878
879 // JNI attach states:
880 enum JNIAttachStates {
881 _not_attaching_via_jni = 1, // thread is not attaching via JNI
882 _attaching_via_jni, // thread is attaching via JNI
883 _attached_via_jni // thread has attached via JNI
884 };
885
886 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
887 // A native thread that is attaching via JNI starts with a value
888 // of _attaching_via_jni and transitions to _attached_via_jni.
889 volatile JNIAttachStates _jni_attach_state;
890
891 public:
892 // State of the stack guard pages for this thread.
893 enum StackGuardState {
894 stack_guard_unused, // not needed
895 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
896 stack_guard_enabled // enabled
897 };
898
899 private:
900
901 StackGuardState _stack_guard_state;
902
903 // Precompute the limit of the stack as used in stack overflow checks.
904 // We load it from here to simplify the stack overflow check in assembly.
905 address _stack_overflow_limit;
906
907 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
908 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
909 // code)
910 volatile oop _exception_oop; // Exception thrown in compiled code
911 volatile address _exception_pc; // PC where exception happened
912 volatile address _exception_handler_pc; // PC for handler of exception
913 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
914
915 // support for JNI critical regions
916 jint _jni_active_critical; // count of entries into JNI critical region
917
918 // For deadlock detection.
919 int _depth_first_number;
920
921 // JVMTI PopFrame support
922 // This is set to popframe_pending to signal that top Java frame should be popped immediately
923 int _popframe_condition;
924
925 #ifndef PRODUCT
926 int _jmp_ring_index;
927 struct {
928 // We use intptr_t instead of address so debugger doesn't try and display strings
929 intptr_t _target;
930 intptr_t _instruction;
931 const char* _file;
932 int _line;
933 } _jmp_ring[ jump_ring_buffer_size ];
934 #endif /* PRODUCT */
935
936 #if INCLUDE_ALL_GCS
937 // Support for G1 barriers
938
939 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
940 // Set of all such queues.
941 static SATBMarkQueueSet _satb_mark_queue_set;
942
943 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
944 // Set of all such queues.
945 static DirtyCardQueueSet _dirty_card_queue_set;
946
947 void flush_barrier_queues();
948 #endif // INCLUDE_ALL_GCS
949
950 friend class VMThread;
951 friend class ThreadWaitTransition;
952 friend class VM_Exit;
953
954 void initialize(); // Initialized the instance variables
955
956 public:
957 // Constructor
958 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads
959 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
960 ~JavaThread();
961
962 #ifdef ASSERT
963 // verify this JavaThread hasn't be published in the Threads::list yet
964 void verify_not_published();
965 #endif
966
967 //JNI functiontable getter/setter for JVMTI jni function table interception API.
968 void set_jni_functions(struct JNINativeInterface_* functionTable) {
969 _jni_environment.functions = functionTable;
970 }
971 struct JNINativeInterface_* get_jni_functions() {
972 return (struct JNINativeInterface_ *)_jni_environment.functions;
973 }
974
975 // This function is called at thread creation to allow
976 // platform specific thread variables to be initialized.
977 void cache_global_variables();
978
979 // Executes Shutdown.shutdown()
980 void invoke_shutdown_hooks();
981
982 // Cleanup on thread exit
983 enum ExitType {
984 normal_exit,
985 jni_detach
986 };
987 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
988
989 void cleanup_failed_attach_current_thread();
990
991 // Testers
992 virtual bool is_Java_thread() const { return true; }
993
994 // Thread chain operations
995 JavaThread* next() const { return _next; }
996 void set_next(JavaThread* p) { _next = p; }
997
998 // Thread oop. threadObj() can be NULL for initial JavaThread
999 // (or for threads attached via JNI)
1000 oop threadObj() const { return _threadObj; }
1001 void set_threadObj(oop p) { _threadObj = p; }
1002
1003 ThreadPriority java_priority() const; // Read from threadObj()
1004
1005 // Prepare thread and add to priority queue. If a priority is
1006 // not specified, use the priority of the thread object. Threads_lock
1007 // must be held while this function is called.
1008 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
1009
1010 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
1011 address saved_exception_pc() { return _saved_exception_pc; }
1012
1013
1014 ThreadFunction entry_point() const { return _entry_point; }
1015
1016 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
1017 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
1018
1019 // Last frame anchor routines
1020
1021 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
1022
1023 // last_Java_sp
1024 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
1025 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
1026
1027 // last_Java_pc
1028
1029 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
1030
1031 // Safepoint support
1032 #ifndef PPC64
1033 JavaThreadState thread_state() const { return _thread_state; }
1034 void set_thread_state(JavaThreadState s) { _thread_state = s; }
1035 #else
1036 // Use membars when accessing volatile _thread_state. See
1037 // Threads::create_vm() for size checks.
1038 inline JavaThreadState thread_state() const;
1039 inline void set_thread_state(JavaThreadState s);
1040 #endif
1041 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
1042 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
1043 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
1044
1045 // thread has called JavaThread::exit() or is terminated
1046 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
1047 // thread is terminated (no longer on the threads list); we compare
1048 // against the two non-terminated values so that a freed JavaThread
1049 // will also be considered terminated.
1050 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
1051 void set_terminated(TerminatedTypes t) { _terminated = t; }
1052 // special for Threads::remove() which is static:
1053 void set_terminated_value() { _terminated = _thread_terminated; }
1054 void block_if_vm_exited();
1055
1056 bool doing_unsafe_access() { return _doing_unsafe_access; }
1057 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
1058
1059 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
1060 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
1061
1062 #if INCLUDE_NMT
1063 // native memory tracking
1064 inline MemRecorder* get_recorder() const { return (MemRecorder*)_recorder; }
1065 inline void set_recorder(MemRecorder* rc) { _recorder = rc; }
1066
1067 private:
1068 // per-thread memory recorder
1069 MemRecorder* volatile _recorder;
1070 #endif // INCLUDE_NMT
1071
1072 // Suspend/resume support for JavaThread
1073 private:
1074 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
1075 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
1076
1077 public:
1078 void java_suspend();
1079 void java_resume();
1080 int java_suspend_self();
1081
1082 void check_and_wait_while_suspended() {
1083 assert(JavaThread::current() == this, "sanity check");
1084
1085 bool do_self_suspend;
1086 do {
1087 // were we externally suspended while we were waiting?
1088 do_self_suspend = handle_special_suspend_equivalent_condition();
1089 if (do_self_suspend) {
1090 // don't surprise the thread that suspended us by returning
1091 java_suspend_self();
1092 set_suspend_equivalent();
1093 }
1094 } while (do_self_suspend);
1095 }
1096 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
1097 // Check for async exception in addition to safepoint and suspend request.
1098 static void check_special_condition_for_native_trans(JavaThread *thread);
1099
1100 // Same as check_special_condition_for_native_trans but finishes the
1101 // transition into thread_in_Java mode so that it can potentially
1102 // block.
1103 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread);
1104
1105 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
1106 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
1107 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1108 // Warning: is_ext_suspend_completed() may temporarily drop the
1109 // SR_lock to allow the thread to reach a stable thread state if
1110 // it is currently in a transient thread state.
1111 return is_ext_suspend_completed(false /*!called_by_wait */,
1112 SuspendRetryDelay, bits);
1113 }
1114
1115 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1116 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1117 // passed as the count and delay parameters. Experiments with specific
1118 // calls to wait_for_ext_suspend_completion() can be done by passing
1119 // other values in the code. Experiments with all calls can be done
1120 // via the appropriate -XX options.
1121 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1122
1123 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1124 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1125
1126 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1127 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1128 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1129
1130 bool is_external_suspend() const {
1131 return (_suspend_flags & _external_suspend) != 0;
1132 }
1133 // Whenever a thread transitions from native to vm/java it must suspend
1134 // if external|deopt suspend is present.
1135 bool is_suspend_after_native() const {
1136 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1137 }
1138
1139 // external suspend request is completed
1140 bool is_ext_suspended() const {
1141 return (_suspend_flags & _ext_suspended) != 0;
1142 }
1143
1144 bool is_external_suspend_with_lock() const {
1145 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1146 return is_external_suspend();
1147 }
1148
1149 // Special method to handle a pending external suspend request
1150 // when a suspend equivalent condition lifts.
1151 bool handle_special_suspend_equivalent_condition() {
1152 assert(is_suspend_equivalent(),
1153 "should only be called in a suspend equivalence condition");
1154 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1155 bool ret = is_external_suspend();
1156 if (!ret) {
1157 // not about to self-suspend so clear suspend equivalence
1158 clear_suspend_equivalent();
1159 }
1160 // implied else:
1161 // We have a pending external suspend request so we leave the
1162 // suspend_equivalent flag set until java_suspend_self() sets
1163 // the ext_suspended flag and clears the suspend_equivalent
1164 // flag. This insures that wait_for_ext_suspend_completion()
1165 // will return consistent values.
1166 return ret;
1167 }
1168
1169 // utility methods to see if we are doing some kind of suspension
1170 bool is_being_ext_suspended() const {
1171 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1172 return is_ext_suspended() || is_external_suspend();
1173 }
1174
1175 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1176
1177 void set_suspend_equivalent() { _suspend_equivalent = true; };
1178 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1179
1180 // Thread.stop support
1181 void send_thread_stop(oop throwable);
1182 AsyncRequests clear_special_runtime_exit_condition() {
1183 AsyncRequests x = _special_runtime_exit_condition;
1184 _special_runtime_exit_condition = _no_async_condition;
1185 return x;
1186 }
1187
1188 // Are any async conditions present?
1189 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1190
1191 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1192
1193 // these next two are also used for self-suspension and async exception support
1194 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1195
1196 // Return true if JavaThread has an asynchronous condition or
1197 // if external suspension is requested.
1198 bool has_special_runtime_exit_condition() {
1199 // We call is_external_suspend() last since external suspend should
1200 // be less common. Because we don't use is_external_suspend_with_lock
1201 // it is possible that we won't see an asynchronous external suspend
1202 // request that has just gotten started, i.e., SR_lock grabbed but
1203 // _external_suspend field change either not made yet or not visible
1204 // yet. However, this is okay because the request is asynchronous and
1205 // we will see the new flag value the next time through. It's also
1206 // possible that the external suspend request is dropped after
1207 // we have checked is_external_suspend(), we will recheck its value
1208 // under SR_lock in java_suspend_self().
1209 return (_special_runtime_exit_condition != _no_async_condition) ||
1210 is_external_suspend() || is_deopt_suspend();
1211 }
1212
1213 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1214
1215 void set_pending_async_exception(oop e) {
1216 _pending_async_exception = e;
1217 _special_runtime_exit_condition = _async_exception;
1218 set_has_async_exception();
1219 }
1220
1221 // Fast-locking support
1222 bool is_lock_owned(address adr) const;
1223
1224 // Accessors for vframe array top
1225 // The linked list of vframe arrays are sorted on sp. This means when we
1226 // unpack the head must contain the vframe array to unpack.
1227 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1228 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1229
1230 // Side structure for deferring update of java frame locals until deopt occurs
1231 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1232 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1233
1234 // These only really exist to make debugging deopt problems simpler
1235
1236 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1237 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1238
1239 // The special resourceMark used during deoptimization
1240
1241 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1242 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1243
1244 intptr_t* must_deopt_id() { return _must_deopt_id; }
1245 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1246 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1247
1248 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1249 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1250
1251 Method* callee_target() const { return _callee_target; }
1252 void set_callee_target (Method* x) { _callee_target = x; }
1253
1254 // Oop results of vm runtime calls
1255 oop vm_result() const { return _vm_result; }
1256 void set_vm_result (oop x) { _vm_result = x; }
1257
1258 Metadata* vm_result_2() const { return _vm_result_2; }
1259 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; }
1260
1261 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1262 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1263
1264 // Exception handling for compiled methods
1265 oop exception_oop() const { return _exception_oop; }
1266 address exception_pc() const { return _exception_pc; }
1267 address exception_handler_pc() const { return _exception_handler_pc; }
1268 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1269
1270 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); }
1271 void set_exception_pc(address a) { _exception_pc = a; }
1272 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1273 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1274
1275 void clear_exception_oop_and_pc() {
1276 set_exception_oop(NULL);
1277 set_exception_pc(NULL);
1278 }
1279
1280 // Stack overflow support
1281 inline size_t stack_available(address cur_sp);
1282 address stack_yellow_zone_base()
1283 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1284 size_t stack_yellow_zone_size()
1285 { return StackYellowPages * os::vm_page_size(); }
1286 address stack_red_zone_base()
1287 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1288 size_t stack_red_zone_size()
1289 { return StackRedPages * os::vm_page_size(); }
1290 bool in_stack_yellow_zone(address a)
1291 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1292 bool in_stack_red_zone(address a)
1293 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1294
1295 void create_stack_guard_pages();
1296 void remove_stack_guard_pages();
1297
1298 void enable_stack_yellow_zone();
1299 void disable_stack_yellow_zone();
1300 void enable_stack_red_zone();
1301 void disable_stack_red_zone();
1302
1303 inline bool stack_guard_zone_unused();
1304 inline bool stack_yellow_zone_disabled();
1305 inline bool stack_yellow_zone_enabled();
1306
1307 // Attempt to reguard the stack after a stack overflow may have occurred.
1308 // Returns true if (a) guard pages are not needed on this thread, (b) the
1309 // pages are already guarded, or (c) the pages were successfully reguarded.
1310 // Returns false if there is not enough stack space to reguard the pages, in
1311 // which case the caller should unwind a frame and try again. The argument
1312 // should be the caller's (approximate) sp.
1313 bool reguard_stack(address cur_sp);
1314 // Similar to above but see if current stackpoint is out of the guard area
1315 // and reguard if possible.
1316 bool reguard_stack(void);
1317
1318 address stack_overflow_limit() { return _stack_overflow_limit; }
1319 void set_stack_overflow_limit() {
1320 _stack_overflow_limit = _stack_base - _stack_size +
1321 ((StackShadowPages +
1322 StackYellowPages +
1323 StackRedPages) * os::vm_page_size());
1324 }
1325
1326 // Misc. accessors/mutators
1327 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1328 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1329 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1330
1331 #ifndef PRODUCT
1332 void record_jump(address target, address instr, const char* file, int line);
1333 #endif /* PRODUCT */
1334
1335 // For assembly stub generation
1336 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1337 #ifndef PRODUCT
1338 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1339 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1340 #endif /* PRODUCT */
1341 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1342 static ByteSize last_Java_sp_offset() {
1343 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1344 }
1345 static ByteSize last_Java_pc_offset() {
1346 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1347 }
1348 static ByteSize frame_anchor_offset() {
1349 return byte_offset_of(JavaThread, _anchor);
1350 }
1351 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1352 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1353 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1354 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1355 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1356 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1357 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1358 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1359 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1360 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); }
1361 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1362 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1363 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1364
1365 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1366 static ByteSize should_post_on_exceptions_flag_offset() {
1367 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1368 }
1369
1370 #if INCLUDE_ALL_GCS
1371 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1372 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1373 #endif // INCLUDE_ALL_GCS
1374
1375 // Returns the jni environment for this thread
1376 JNIEnv* jni_environment() { return &_jni_environment; }
1377
1378 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1379 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1380 // Only return NULL if thread is off the thread list; starting to
1381 // exit should not return NULL.
1382 if (thread_from_jni_env->is_terminated()) {
1383 thread_from_jni_env->block_if_vm_exited();
1384 return NULL;
1385 } else {
1386 return thread_from_jni_env;
1387 }
1388 }
1389
1390 // JNI critical regions. These can nest.
1391 bool in_critical() { return _jni_active_critical > 0; }
1392 bool in_last_critical() { return _jni_active_critical == 1; }
1393 void enter_critical() { assert(Thread::current() == this ||
1394 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),
1395 "this must be current thread or synchronizing");
1396 _jni_active_critical++; }
1397 void exit_critical() { assert(Thread::current() == this,
1398 "this must be current thread");
1399 _jni_active_critical--;
1400 assert(_jni_active_critical >= 0,
1401 "JNI critical nesting problem?"); }
1402
1403 // For deadlock detection
1404 int depth_first_number() { return _depth_first_number; }
1405 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1406
1407 private:
1408 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1409
1410 public:
1411 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1412 void add_monitor_chunk(MonitorChunk* chunk);
1413 void remove_monitor_chunk(MonitorChunk* chunk);
1414 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1415 void inc_in_deopt_handler() { _in_deopt_handler++; }
1416 void dec_in_deopt_handler() {
1417 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1418 if (_in_deopt_handler > 0) { // robustness
1419 _in_deopt_handler--;
1420 }
1421 }
1422
1423 private:
1424 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1425
1426 public:
1427
1428 // Frame iteration; calls the function f for all frames on the stack
1429 void frames_do(void f(frame*, const RegisterMap*));
1430
1431 // Memory operations
1432 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1433
1434 // Sweeper operations
1435 void nmethods_do(CodeBlobClosure* cf);
1436
1437 // RedefineClasses Support
1438 void metadata_do(void f(Metadata*));
1439
1440 // Memory management operations
1441 void gc_epilogue();
1442 void gc_prologue();
1443
1444 // Misc. operations
1445 char* name() const { return (char*)get_thread_name(); }
1446 void print_on(outputStream* st) const;
1447 void print_value();
1448 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1449 void print_thread_state() const PRODUCT_RETURN;
1450 void print_on_error(outputStream* st, char* buf, int buflen) const;
1451 void verify();
1452 const char* get_thread_name() const;
1453 private:
1454 // factor out low-level mechanics for use in both normal and error cases
1455 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1456 public:
1457 const char* get_threadgroup_name() const;
1458 const char* get_parent_name() const;
1459
1460 // Accessing frames
1461 frame last_frame() {
1462 _anchor.make_walkable(this);
1463 return pd_last_frame();
1464 }
1465 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1466
1467 // Returns method at 'depth' java or native frames down the stack
1468 // Used for security checks
1469 Klass* security_get_caller_class(int depth);
1470
1471 // Print stack trace in external format
1472 void print_stack_on(outputStream* st);
1473 void print_stack() { print_stack_on(tty); }
1474
1475 // Print stack traces in various internal formats
1476 void trace_stack() PRODUCT_RETURN;
1477 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1478 void trace_frames() PRODUCT_RETURN;
1479 void trace_oops() PRODUCT_RETURN;
1480
1481 // Print an annotated view of the stack frames
1482 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
1483 void validate_frame_layout() {
1484 print_frame_layout(0, true);
1485 }
1486
1487 // Returns the number of stack frames on the stack
1488 int depth() const;
1489
1490 // Function for testing deoptimization
1491 void deoptimize();
1492 void make_zombies();
1493
1494 void deoptimized_wrt_marked_nmethods();
1495
1496 // Profiling operation (see fprofile.cpp)
1497 public:
1498 bool profile_last_Java_frame(frame* fr);
1499
1500 private:
1501 ThreadProfiler* _thread_profiler;
1502 private:
1503 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1504 friend class FlatProfilerTask; // uses get_thread_profiler.
1505 friend class ThreadProfilerMark; // uses get_thread_profiler.
1506 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1507 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1508 ThreadProfiler* result = _thread_profiler;
1509 _thread_profiler = tp;
1510 return result;
1511 }
1512
1513 // NMT (Native memory tracking) support.
1514 // This flag helps NMT to determine if this JavaThread will be blocked
1515 // at safepoint. If not, ThreadCritical is needed for writing memory records.
1516 // JavaThread is only safepoint visible when it is in Threads' thread list,
1517 // it is not visible until it is added to the list and becomes invisible
1518 // once it is removed from the list.
1519 public:
1520 bool is_safepoint_visible() const { return _safepoint_visible; }
1521 void set_safepoint_visible(bool visible) { _safepoint_visible = visible; }
1522 private:
1523 bool _safepoint_visible;
1524
1525 // Static operations
1526 public:
1527 // Returns the running thread as a JavaThread
1528 static inline JavaThread* current();
1529
1530 // Returns the active Java thread. Do not use this if you know you are calling
1531 // from a JavaThread, as it's slower than JavaThread::current. If called from
1532 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1533 // operation. You may not want that either.
1534 static JavaThread* active();
1535
1536 inline CompilerThread* as_CompilerThread();
1537
1538 public:
1539 virtual void run();
1540 void thread_main_inner();
1541
1542 private:
1543 // PRIVILEGED STACK
1544 PrivilegedElement* _privileged_stack_top;
1545 GrowableArray<oop>* _array_for_gc;
1546 public:
1547
1548 // Returns the privileged_stack information.
1549 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1550 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1551 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1552
1553 public:
1554 // Thread local information maintained by JVMTI.
1555 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1556 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1557 // getter is used to get this JavaThread's JvmtiThreadState if it has
1558 // one which means NULL can be returned. JvmtiThreadState::state_for()
1559 // is used to get the specified JavaThread's JvmtiThreadState if it has
1560 // one or it allocates a new JvmtiThreadState for the JavaThread and
1561 // returns it. JvmtiThreadState::state_for() will return NULL only if
1562 // the specified JavaThread is exiting.
1563 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1564 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1565 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1566 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1567
1568 // JVMTI PopFrame support
1569 // Setting and clearing popframe_condition
1570 // All of these enumerated values are bits. popframe_pending
1571 // indicates that a PopFrame() has been requested and not yet been
1572 // completed. popframe_processing indicates that that PopFrame() is in
1573 // the process of being completed. popframe_force_deopt_reexecution_bit
1574 // indicates that special handling is required when returning to a
1575 // deoptimized caller.
1576 enum PopCondition {
1577 popframe_inactive = 0x00,
1578 popframe_pending_bit = 0x01,
1579 popframe_processing_bit = 0x02,
1580 popframe_force_deopt_reexecution_bit = 0x04
1581 };
1582 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1583 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1584 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1585 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1586 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1587 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1588 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1589 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1590 #ifdef CC_INTERP
1591 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1592 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1593 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1594 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1595 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1596 #endif
1597
1598 private:
1599 // Saved incoming arguments to popped frame.
1600 // Used only when popped interpreted frame returns to deoptimized frame.
1601 void* _popframe_preserved_args;
1602 int _popframe_preserved_args_size;
1603
1604 public:
1605 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1606 void* popframe_preserved_args();
1607 ByteSize popframe_preserved_args_size();
1608 WordSize popframe_preserved_args_size_in_words();
1609 void popframe_free_preserved_args();
1610
1611
1612 private:
1613 JvmtiThreadState *_jvmti_thread_state;
1614 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1615
1616 // Used by the interpreter in fullspeed mode for frame pop, method
1617 // entry, method exit and single stepping support. This field is
1618 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1619 // It can be set to zero asynchronously (i.e., without a VM operation
1620 // or a lock) so we have to be very careful.
1621 int _interp_only_mode;
1622
1623 public:
1624 // used by the interpreter for fullspeed debugging support (see above)
1625 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1626 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1627 int get_interp_only_mode() { return _interp_only_mode; }
1628 void increment_interp_only_mode() { ++_interp_only_mode; }
1629 void decrement_interp_only_mode() { --_interp_only_mode; }
1630
1631 // support for cached flag that indicates whether exceptions need to be posted for this thread
1632 // if this is false, we can avoid deoptimizing when events are thrown
1633 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1634 private:
1635 int _should_post_on_exceptions_flag;
1636
1637 public:
1638 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1639 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1640
1641 private:
1642 ThreadStatistics *_thread_stat;
1643
1644 public:
1645 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1646
1647 // Return a blocker object for which this thread is blocked parking.
1648 oop current_park_blocker();
1649
1650 private:
1651 static size_t _stack_size_at_create;
1652
1653 public:
1654 static inline size_t stack_size_at_create(void) {
1655 return _stack_size_at_create;
1656 }
1657 static inline void set_stack_size_at_create(size_t value) {
1658 _stack_size_at_create = value;
1659 }
1660
1661 #if INCLUDE_ALL_GCS
1662 // SATB marking queue support
1663 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1664 static SATBMarkQueueSet& satb_mark_queue_set() {
1665 return _satb_mark_queue_set;
1666 }
1667
1668 // Dirty card queue support
1669 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1670 static DirtyCardQueueSet& dirty_card_queue_set() {
1671 return _dirty_card_queue_set;
1672 }
1673 #endif // INCLUDE_ALL_GCS
1674
1675 // This method initializes the SATB and dirty card queues before a
1676 // JavaThread is added to the Java thread list. Right now, we don't
1677 // have to do anything to the dirty card queue (it should have been
1678 // activated when the thread was created), but we have to activate
1679 // the SATB queue if the thread is created while a marking cycle is
1680 // in progress. The activation / de-activation of the SATB queues at
1681 // the beginning / end of a marking cycle is done during safepoints
1682 // so we have to make sure this method is called outside one to be
1683 // able to safely read the active field of the SATB queue set. Right
1684 // now, it is called just before the thread is added to the Java
1685 // thread list in the Threads::add() method. That method is holding
1686 // the Threads_lock which ensures we are outside a safepoint. We
1687 // cannot do the obvious and set the active field of the SATB queue
1688 // when the thread is created given that, in some cases, safepoints
1689 // might happen between the JavaThread constructor being called and the
1690 // thread being added to the Java thread list (an example of this is
1691 // when the structure for the DestroyJavaVM thread is created).
1692 #if INCLUDE_ALL_GCS
1693 void initialize_queues();
1694 #else // INCLUDE_ALL_GCS
1695 void initialize_queues() { }
1696 #endif // INCLUDE_ALL_GCS
1697
1698 // Machine dependent stuff
1699 #ifdef TARGET_OS_ARCH_linux_x86
1700 # include "thread_linux_x86.hpp"
1701 #endif
1702 #ifdef TARGET_OS_ARCH_linux_sparc
1703 # include "thread_linux_sparc.hpp"
1704 #endif
1705 #ifdef TARGET_OS_ARCH_linux_zero
1706 # include "thread_linux_zero.hpp"
1707 #endif
1708 #ifdef TARGET_OS_ARCH_solaris_x86
1709 # include "thread_solaris_x86.hpp"
1710 #endif
1711 #ifdef TARGET_OS_ARCH_solaris_sparc
1712 # include "thread_solaris_sparc.hpp"
1713 #endif
1714 #ifdef TARGET_OS_ARCH_windows_x86
1715 # include "thread_windows_x86.hpp"
1716 #endif
1717 #ifdef TARGET_OS_ARCH_linux_arm
1718 # include "thread_linux_arm.hpp"
1719 #endif
1720 #ifdef TARGET_OS_ARCH_linux_ppc
1721 # include "thread_linux_ppc.hpp"
1722 #endif
1723 #ifdef TARGET_OS_ARCH_aix_ppc
1724 # include "thread_aix_ppc.hpp"
1725 #endif
1726 #ifdef TARGET_OS_ARCH_bsd_x86
1727 # include "thread_bsd_x86.hpp"
1728 #endif
1729 #ifdef TARGET_OS_ARCH_bsd_zero
1730 # include "thread_bsd_zero.hpp"
1731 #endif
1732
1733
1734 public:
1735 void set_blocked_on_compilation(bool value) {
1736 _blocked_on_compilation = value;
1737 }
1738
1739 bool blocked_on_compilation() {
1740 return _blocked_on_compilation;
1741 }
1742 protected:
1743 bool _blocked_on_compilation;
1744
1745
1746 // JSR166 per-thread parker
1747 private:
1748 Parker* _parker;
1749 public:
1750 Parker* parker() { return _parker; }
1751
1752 // Biased locking support
1753 private:
1754 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1755 public:
1756 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1757 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1758
1759 // clearing/querying jni attach status
1760 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
1761 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
1762 inline void set_done_attaching_via_jni();
1763 private:
1764 // This field is used to determine if a thread has claimed
1765 // a par_id: it is UINT_MAX if the thread has not claimed a par_id;
1766 // otherwise its value is the par_id that has been claimed.
1767 uint _claimed_par_id;
1768 public:
1769 uint get_claimed_par_id() { return _claimed_par_id; }
1770 void set_claimed_par_id(uint id) { _claimed_par_id = id;}
1771 };
1772
1773 // Inline implementation of JavaThread::current
1774 inline JavaThread* JavaThread::current() {
1775 Thread* thread = ThreadLocalStorage::thread();
1776 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1777 return (JavaThread*)thread;
1778 }
1779
1780 inline CompilerThread* JavaThread::as_CompilerThread() {
1781 assert(is_Compiler_thread(), "just checking");
1782 return (CompilerThread*)this;
1783 }
1784
1785 inline bool JavaThread::stack_guard_zone_unused() {
1786 return _stack_guard_state == stack_guard_unused;
1787 }
1788
1789 inline bool JavaThread::stack_yellow_zone_disabled() {
1790 return _stack_guard_state == stack_guard_yellow_disabled;
1791 }
1792
1793 inline bool JavaThread::stack_yellow_zone_enabled() {
1794 #ifdef ASSERT
1795 if (os::uses_stack_guard_pages()) {
1796 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1797 }
1798 #endif
1799 return _stack_guard_state == stack_guard_enabled;
1800 }
1801
1802 inline size_t JavaThread::stack_available(address cur_sp) {
1803 // This code assumes java stacks grow down
1804 address low_addr; // Limit on the address for deepest stack depth
1805 if ( _stack_guard_state == stack_guard_unused) {
1806 low_addr = stack_base() - stack_size();
1807 } else {
1808 low_addr = stack_yellow_zone_base();
1809 }
1810 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1811 }
1812
1813 // A thread used for Compilation.
1814 class CompilerThread : public JavaThread {
1815 friend class VMStructs;
1816 private:
1817 CompilerCounters* _counters;
1818
1819 ciEnv* _env;
1820 CompileLog* _log;
1821 CompileTask* _task;
1822 CompileQueue* _queue;
1823 BufferBlob* _buffer_blob;
1824
1825 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
1826 AbstractCompiler* _compiler;
1827
1828 public:
1829
1830 static CompilerThread* current();
1831
1832 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1833
1834 bool is_Compiler_thread() const { return true; }
1835 // Hide this compiler thread from external view.
1836 bool is_hidden_from_external_view() const { return true; }
1837
1838 void set_compiler(AbstractCompiler* c) { _compiler = c; }
1839 AbstractCompiler* compiler() const { return _compiler; }
1840
1841 CompileQueue* queue() const { return _queue; }
1842 CompilerCounters* counters() const { return _counters; }
1843
1844 // Get/set the thread's compilation environment.
1845 ciEnv* env() { return _env; }
1846 void set_env(ciEnv* env) { _env = env; }
1847
1848 BufferBlob* get_buffer_blob() const { return _buffer_blob; }
1849 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1850
1851 // Get/set the thread's logging information
1852 CompileLog* log() { return _log; }
1853 void init_log(CompileLog* log) {
1854 // Set once, for good.
1855 assert(_log == NULL, "set only once");
1856 _log = log;
1857 }
1858
1859 // GC support
1860 // Apply "f->do_oop" to all root oops in "this".
1861 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
1862 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1863
1864 #ifndef PRODUCT
1865 private:
1866 IdealGraphPrinter *_ideal_graph_printer;
1867 public:
1868 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1869 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1870 #endif
1871
1872 // Get/set the thread's current task
1873 CompileTask* task() { return _task; }
1874 void set_task(CompileTask* task) { _task = task; }
1875
1876 // Track the nmethod currently being scanned by the sweeper
1877 void set_scanned_nmethod(nmethod* nm) {
1878 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");
1879 _scanned_nmethod = nm;
1880 }
1881 };
1882
1883 inline CompilerThread* CompilerThread::current() {
1884 return JavaThread::current()->as_CompilerThread();
1885 }
1886
1887
1888 // The active thread queue. It also keeps track of the current used
1889 // thread priorities.
1890 class Threads: AllStatic {
1891 friend class VMStructs;
1892 private:
1893 static JavaThread* _thread_list;
1894 static int _number_of_threads;
1895 static int _number_of_non_daemon_threads;
1896 static int _return_code;
1897 #ifdef ASSERT
1898 static bool _vm_complete;
1899 #endif
1900
1901 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS);
1902 static void initialize_jsr292_core_classes(TRAPS);
1903 public:
1904 // Thread management
1905 // force_daemon is a concession to JNI, where we may need to add a
1906 // thread to the thread list before allocating its thread object
1907 static void add(JavaThread* p, bool force_daemon = false);
1908 static void remove(JavaThread* p);
1909 static bool includes(JavaThread* p);
1910 static JavaThread* first() { return _thread_list; }
1911 static void threads_do(ThreadClosure* tc);
1912
1913 // Initializes the vm and creates the vm thread
1914 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1915 static void convert_vm_init_libraries_to_agents();
1916 static void create_vm_init_libraries();
1917 static void create_vm_init_agents();
1918 static void shutdown_vm_agents();
1919 static bool destroy_vm();
1920 // Supported VM versions via JNI
1921 // Includes JNI_VERSION_1_1
1922 static jboolean is_supported_jni_version_including_1_1(jint version);
1923 // Does not include JNI_VERSION_1_1
1924 static jboolean is_supported_jni_version(jint version);
1925
1926 // Garbage collection
1927 static void follow_other_roots(void f(oop*));
1928
1929 // Apply "f->do_oop" to all root oops in all threads.
1930 // This version may only be called by sequential code.
1931 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1932 // This version may be called by sequential or parallel code.
1933 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
1934 // This creates a list of GCTasks, one per thread.
1935 static void create_thread_roots_tasks(GCTaskQueue* q);
1936 // This creates a list of GCTasks, one per thread, for marking objects.
1937 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1938
1939 // Apply "f->do_oop" to roots in all threads that
1940 // are part of compiled frames
1941 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1942
1943 static void convert_hcode_pointers();
1944 static void restore_hcode_pointers();
1945
1946 // Sweeper
1947 static void nmethods_do(CodeBlobClosure* cf);
1948
1949 // RedefineClasses support
1950 static void metadata_do(void f(Metadata*));
1951
1952 static void gc_epilogue();
1953 static void gc_prologue();
1954 #ifdef ASSERT
1955 static bool is_vm_complete() { return _vm_complete; }
1956 #endif
1957
1958 // Verification
1959 static void verify();
1960 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1961 static void print(bool print_stacks, bool internal_format) {
1962 // this function is only used by debug.cpp
1963 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1964 }
1965 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1966
1967 // Get Java threads that are waiting to enter a monitor. If doLock
1968 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1969 // VM needs to be at a safepoint.
1970 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1971 address monitor, bool doLock);
1972
1973 // Get owning Java thread from the monitor's owner field. If doLock
1974 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1975 // VM needs to be at a safepoint.
1976 static JavaThread *owning_thread_from_monitor_owner(address owner,
1977 bool doLock);
1978
1979 // Number of threads on the active threads list
1980 static int number_of_threads() { return _number_of_threads; }
1981 // Number of non-daemon threads on the active threads list
1982 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1983
1984 // Deoptimizes all frames tied to marked nmethods
1985 static void deoptimized_wrt_marked_nmethods();
1986
1987 };
1988
1989
1990 // Thread iterator
1991 class ThreadClosure: public StackObj {
1992 public:
1993 virtual void do_thread(Thread* thread) = 0;
1994 };
1995
1996 class SignalHandlerMark: public StackObj {
1997 private:
1998 Thread* _thread;
1999 public:
2000 SignalHandlerMark(Thread* t) {
2001 _thread = t;
2002 if (_thread) _thread->enter_signal_handler();
2003 }
2004 ~SignalHandlerMark() {
2005 if (_thread) _thread->leave_signal_handler();
2006 _thread = NULL;
2007 }
2008 };
2009
2010
2011 #endif // SHARE_VM_RUNTIME_THREAD_HPP